“High-tech enterprise” refers to the continuous research and development and transformation of technological achievements in the high-tech fields supported by the state, forming the core independent intellectual property rights of the enterprise, and carrying out business activities based on this, and transforming major high-tech achievements into productivity The technical level belongs to domestic leading or international advanced enterprises. Obtaining the title of high-tech enterprise is a milestone in the progress of Sinocrystal’s achievement level and product technology content.

According to the relevant provisions of the “Administrative Measures for the Identification of High-tech Enterprises” and the “Guidelines for the Management of Identification of High-tech Enterprises”, after strict application procedures such as company declaration, local preliminary examination, expert review, and publicity, our company was finally identified as a “high-tech enterprise” . Sinocrystal was established in 2008, a manufacturer integrating scientific research, production and development, focusing on LCD Displays and Modules.

With the rapid development of the company, the company’s technology research and development and independent innovation work has never stopped. So far, there are 7 authorized utility model patents and 2 invention patents that have entered the stage of substantive examination. There are also a number of innovative achievements that are being verified and are preparing to declare intellectual property rights. The evaluation of high-tech enterprises this time is a great encouragement for the research and development of Sinocrystal by Shenzhen Science and Technology, Finance and Taxation Departments, and it also puts forward higher scientific research and technical requirements for our company. The company will live up to expectations, continue to increase investment in product research and development, provide more high-quality LCD screen products, and serve the display industry, so as to repay the support and love of the national government, all walks of life and Sinocrystal.

The post Sinocrystal -- High-tech Enterprise first appeared on Sinocrystal.

TFT LCD display are susceptible to glare and reflection from direct sunlight or high-bright applications. In almost all TFT LCDs there is an air gap between the TFT panel and the cover lens.

When a normal display is used in an outdoor environment, there are some factors that affect its readability. The most common one is “fog”, or condensation, which forms on the inner surface of display’s vandal shield. Another factor is the reflection of sunlight, which causes a mirror-image on the display. Both phenomena can be solved by using optical bonding.This method eliminates the air gap between the cover glass and the display and to increase the display’s contrast ratio by reducing the amount of reflected ambient light.

Optical bonding is the preferred option for project applications where the highest levels of durability, optical clarity, and reflectivity are required, such as military, marine, medical, transportation and retail sectors.

Key benefits:

* Increased ruggedness
* Improved durability
*Condensation
*Extended temperature range and EMI filtering
*Reduced reflections
*Improved contrast ratio
*Sunlight readability
*Zero contamination (dust or dirt)
*Improved heat dissipation (heat can dissipate through the front glass)

Applications:

*Military
*Transportation
*Outdoor Product
*EV Chargers
*Medical
*Automotive
*Instrumentation

The market share of optical adhesives is expected to grow to 30% by 2025. The main reasons for this growth are the ever-increasing demand for high durability displays in public view applications and the continued miniaturisation of devices which necessitates better optical clarity.

The post Advantages and applications of optical bonding first appeared on Sinocrystal.

The main features are.

(1) the use of good characteristics: low-voltage applications, low drive voltage, solidification of the use of safety and reliability; flat words, and thin and light, saving a lot of raw materials and use of space. Low power consumption, his work number is about one tenth of the CRT display, reflective TFT-LCD is even only about one percent of the CRT, saving a lot of energy.

TFT-LCD products also have many features such as specification models, size series, variety, easy and flexible to use, easy to maintain, update, upgrade, and long service life.

The display range covers the application range of all displays from 1 inch to 40 inches and the projection of large planes, and is a full-size display terminal. Display quality ranges from the simplest monochrome character graphics to high resolution, high color fidelity, high brightness, high contrast, and high responsiveness of various specification models of video displays. Display methods are direct-view type, projection type, see-through type, and also reflective type.

(2) Good environmental characteristics: no radiation, no flicker, no damage to the user’s health. In particular, the emergence of TFT-LCD electronic books, will bring mankind into the paperless office, paperless printing era, triggering a revolution in the way humans learn, spread and record civilization.

(3) Wide range of use, from -20 ℃ to +50 ℃ temperature range can be used normally, after the temperature reinforced processing of TFT LCD low temperature working temperature can reach -80 ℃. That is, as a mobile terminal display, desktop terminal display, there can be a large screen projection TV, is a full-size video display terminal with excellent performance.

(4) The manufacturing technology is highly automated and has good characteristics of large-scale industrial production, and the technology of TFT-LCD industry is mature and the yield rate of large-scale production is over 90%.

(5) TFT LCD is easy to integrate and update, and is a perfect combination of large-scale semiconductor integrated circuit technology, with great potential for continued development. Currently there are amorphous, polycrystalline, monocrystalline silicon TFT LCD, in the future there will be other materials of TFT. both glass substrate and plastic substrate.

At present, Sinocrystal supplies small and medium size TFT-LCD screen, factory direct sales can be customized, interface optional. 0.96 inch – 10.1 inch TFT-LCD large inventory. Welcome to consult

The post Know More About TFT LCD --LCD Manufacturer first appeared on Sinocrystal.

In TFT LCD liquid crystal display module, according to the formation of different reasons and differences in location and shape, line defects can be divided into screen breakage class line defects, screen short circuit class line defects, short circuit between the terminals class line defects, drive abnormal class defects, etc., the phenomenon and causes of each type of line defects, please see the following table.

Screen breakage and short circuit is usually due to the screen itself in the production process of dust pollution and other factors, drive abnormal class line defects is the problem of the drive circuit, several other types of line defects and display terminal process, these types of line defects can be adjusted through the drive circuit, replace COF/COG and other methods to achieve the repair of line defects.

LCD line defects are the most common defects. Broken wire class line defects to data line breakage is the main, in the display design into the broken line repair design countermeasures, can greatly improve the product qualification rate.

The repair method is mainly divided into: off-screen repair and on-screen repair two design countermeasures.

1. Off-screen repair design of broken wires:

Through off-screen alignment, the data signal is synchronously transmitted to the broken line that cannot be displayed normally, so as to realize the normal work of the display.

2. On-screen repair design for broken wires:

Can be achieved with pixel design, by borrowing the path on the pixel, to achieve the data line disconnection of the upper and lower parts of the conductive, can save off-screen repair design often used when the amplifier OP, reduce product development costs. Different display modes, different borrowing paths, different pixel structures, and corresponding repair design solutions are different.

The post Causes and Solutions of Common Line Defects in TFT LCD Displays first appeared on Sinocrystal.

TN liquid crystal display technology can be said to be the most basic liquid crystal display, and after other kinds of liquid crystal display can also be said to be improved by TN type as the origin. Again, it works much simpler than other technologies, see the picture below. The diagram shows a simple structure of a TN LCD, including vertical and horizontal polarizers, a directional film with fine grooves, liquid crystal materials and conductive glass substrates. The principle of display is to place the liquid crystal material between two transparent conductive glass with vertical polarizer attached to the optical axis. The liquid crystal molecules will rotate and arrange in order according to the direction of the fine groove of the film. If the electric field is not formed, the light will be smoothly shot into the polarizer, and the liquid crystal molecules will rotate their direction of travel, and then shot out from the other side. If the two pieces of conductive glass are electrified, an electric field will be created between the two pieces of glass, which will affect the arrangement of the liquid crystal molecules between them, causing their molecular rods to twist, and the light cannot penetrate, thus blocking the light source. The phenomenon of light and dark contrast thus obtained is called twisted Nematic field effect, or TNFE (Twisted Nematic Field Effect).

Almost all liquid crystal displays used in electronic products are made by torsional nematic field effect principle. The display principle of STN type is similar, but the difference is that the liquid crystal molecule of TN torsional nematic field effect rotates the incident light 90 degrees, while the STN super torsional nematic field effect rotates the incident light 180~270 degrees. To explain here is that the pure TN LIQUID crystal display itself only light and dark two situations (or called black and white), and there is no way to do color change. And STN LCD involves the relationship between liquid crystal materials, as well as light interference phenomenon, so the color of the display are mainly light green and orange. However, if a color filter is added to the traditional monochrome STN LCD, and any pixel of the monochrome display matrix is divided into three sub-pixels, and the red, green and blue primary colors are displayed through the color filter respectively, and then the proportion of the three primary colors is harmonized. It can also display colors in full color mode. In addition, TN type LCD display if the larger the display screen, the screen contrast will appear poor, but by the improved TECHNOLOGY of STN, can make up for the lack of contrast.

TFT type LIQUID crystal display is more complex, the main composition includes, fluorescent tube, light guide plate, polarizer, filter plate, glass substrate, direction film, liquid crystal material, thin mode transistor and so on. First, the LCD must use a backlight, or fluorescent tube, to project a light source that passes through a polarizer and then through the liquid crystal, where the molecules align in a way that changes the Angle of light passing through the liquid. The light must then pass through a colored filter film and another polarizer in front of it. So we can control the intensity and color of the light as long as we change the voltage of the liquid crystal, and then can change the color combinations of different shades on the liquid crystal panel.

The post What Is LCD Technology? first appeared on Sinocrystal.

Types of LCD modules

LCD modules are based on LCD liquid crystal screen as the core, with a certain control circuit, in order to achieve the purpose of convenient use of display components. According to the LCD can display different content, LCD display module can be divided into the following three types:

1. Digital display LCD module

2. Dot matrix character LCD module

3. Dot matrix graphics LCD module

LCD display module advantages

LCD display the most important advantage is to display multiple lines of Chinese characters as well as graphics.

LCD module driver 1, LCD module driver overview: LCD module driver debugging, is a very important part of the entire cell phone development process, in the early stages of the development of each new model, the first to debug the LCD module driver, we commonly known as “point screen” LCD Display module

We call it “dot screen” LCD module. The “dot screen” debugging includes two parts, one is to light up the LCD backlight, the second is to debug the LCD display. Backlight driver debugging methods and techniques, will be described in the backlight document.

LCD module 1. vertical polarization of the incident light; 2. glass base plate with indium tin oxide (ITO) transparent electrode LCD module

It has been found through research that charging a liquid crystal changes its molecular arrangement, which in turn causes distortion or refraction of light. LCD is made according to this principle.

LCD structure and principle

LCD itself does not emit light, it is a passive display by adjusting the brightness of light to achieve the display effect.LCD is mainly made by using the twist-vector effect of liquid crystal, which is an electric field effect. Here first of all, we introduce the structure and principle of LCD, as well as its technical and technological characteristics. This will enable the purchase of the target, more scientific and reasonable use and maintenance. Liquid crystal is an organic complex, consisting of long rod-like molecules. In their natural state, the long axes of these rod-like molecules are roughly parallel. The shape of the transparent electrodes will determine the address of the dark color that is displayed without light passing through when the power is turned on to the LCD. Vertical stripes are etched on the base plate, this way the liquid crystal arrangement direction, will be the same direction as the incident light after polarization.

LCD module seven, the module storage if long-term (such as more than a few years) storage, we recommend the following ways: 1. in a polyethylene pocket (preferably with anti-static coating) and seal the mouth; 2. never put any items on the surface pressure; 3. put the LCD module in a dark place, avoid strong light; 4. stored between 5 ° C ~ +30 ° C; 5. strictly avoid storage in the extreme temperature / humidity conditions. 4 . dot matrix LCD module display contrast, viewing angle and temperature, drive voltage has a great relationship, so if the VEE adjustment is too high, not only will affect the display, but also shorten the service life of the module; 5. module in use, access to power and disconnect the power supply, must be in the positive power supply after stable access to input signal level. If the signal level is input before or after the power supply is stabilized, it may damage the IC and circuit in the module.

The post LCD-LCM Display Structure And Function-LCD Manufacturer first appeared on Sinocrystal.

VA segment LCD advantages

1, VA segment LCD black and white contrast ratio is high, compared to other black background white segment LCD, VA LCD background color is more black and pure.

2, VA segment LCDs have a wider viewing angle. Compared with the ordinary material LCD only 50 degrees of view range, VA screen has a view range of 100 degrees.

3, VA segment LCD do color segment code LCD effect is good, the best screen printing effect.

4, VA segment code LCD effect high-end, mostly used in high-end electronic products.

Disadvantages of VA segment LCD

1, VA segment LCD response speed is relatively slow, because VA screen liquid crystal material is special, liquid crystal inertia is relatively large, so the response speed is slower.

2, VA LCD screen voltage requirements than other screen requirements, such as customer requirements for low voltage, TN screen can do a minimum of 2.6V, but VA screen, because the liquid crystal inert, the voltage is too low will lead to LCD drive up, so 2.6V VA screen can not do.

3, VA LCD power consumption is also relatively higher. Mainly because the VA screen must be used with the backlight, and the backlight brightness requirements are high, the number of lights, power consumption.

4, VA segment LCD cost is also higher than the ordinary material LCD.

The above is about the advantages and disadvantages of VA segment LCD, I hope it is useful to you, and other need to share the knowledge of VA LCD, point attention, message to the editor Oh. I as involved in the N VA screen custom sales, has a wealth of expertise, with top factory strength of professionals, you can definitely customize the most satisfactory products.

The post What Are The Advantages And Disadvantages of VA Segment LCD Displays first appeared on Sinocrystal.

                         TFT-LCD Concept Analysis and Process Introduction

 Each pixel of TFT-LCD is controlled by the TFT integrated in itself, and they are active pixels. As a result, not only the response time can be greatly accelerated, at least to about 80ms; the contrast and brightness are also greatly improved; and the resolution is also improved to an unprecedented extent. Because it has higher contrast and richer colors, the screen is updated more frequently, so we call it "true color".

Introduction of the three main stages of TFT-LCD process

Front Stage

The front-end process is similar to the semiconductor process, but the difference is that the thin-film transistors are made on glass instead of silicon wafers.

Middle Stage

In the middle stage, the glass of the front stage is used as the substrate, and the glass substrate of the color filter is combined, and liquid crystal (LC) is injected between the two glass substrates.

Back-end (Module Assembly)

The back-end module assembly process is the production operation of assembling the glass after the Cell process with other components such as backlight panels, circuits, and bezels.

 TFT type LCD is more complex, mainly composed of: fluorescent tube, light guide, polarizer, filter plate, glass substrate, orientation film, liquid crystal material, thin mode transistor, etc. First, the LCD must first use the backlight, that is, the fluorescent tube to project the light source, these light sources will first pass through a polarizing plate and then through the liquid crystal. The arrangement of the liquid crystal molecules changes the angle of the light that penetrates the liquid crystal, and then the light must pass through a colored filter film and another polarizing plate in front of it. Therefore, we can control the intensity and color of the light that appears at the end by changing the voltage value that stimulates the liquid crystal, so that the color combination with different tones can be changed on the LCD panel.

The post TFT LCD Concept Analysis And Process Introduction first appeared on Sinocrystal.

TFT (thin film transistor) is a kind of active matrix liquid crystal display. It can “actively” control each independent pixel on the screen, which can greatly improve the reaction time. Generally, the reaction time of TFT is relatively fast, about 80 milliseconds, and the viewing angle is large, which can generally reach about 130 degrees.

Polarity conversion mode of TFT LCD display:

The driving voltage of liquid crystal molecules cannot be fixed at a certain value, otherwise, as time goes by, the liquid crystal molecules will polarize and gradually lose their optical rotation characteristics. Therefore, in order to avoid the destruction of the characteristics of liquid crystal molecules, the driving voltage of liquid crystal molecules must be polarity changed, which requires the display voltage in the liquid crystal display screen to be divided into two polarity, one is positive polarity, the other is negative polarity. When the voltage of the display electrode is higher than that of the common electrode, it is called positive polarity; When the voltage of the display electrode is lower than that of the common electrode, it is called negative polarity. Whether it is positive or negative, there will be a group of gray scales with the same brightness, so when the absolute value of the pressure difference between the upper and lower layers of glass is fixed, the gray scales are exactly the same. However, in these two cases, the rotation of liquid crystal molecules is completely opposite, which can avoid the above-mentioned destruction of characteristics when the rotation of liquid crystal molecules is always fixed in one direction. There are four common polarity transformation modes, namely, frame by frame phase inversion mode, line by line phase inversion mode, column by column phase inversion mode and point by point phase inversion mode.

For the frame by frame inversion mode, in the same frame, all adjacent points of the whole picture have the same polarity, while the polarity of adjacent frames is different; For the line by line phase inversion mode, the same polarity exists on the same line, while the polarity of adjacent lines is different; For the column by column phase inversion mode, the same polarity exists in the same column, while the polarity of adjacent columns is different; For the point by point phase inversion mode, the polarity of each point is different from its adjacent upper, lower, left and right points.

At present, most of the panel polarity conversion methods used by the common personal computer LCD are point-by-point conversion methods. Why? The reason is that the display quality of phase inversion point by point is much better than other transformation methods. The table lists the performance comparison of four polarity transformation modes: frame by frame phase inversion, line by line phase inversion, column by column phase inversion and point by point phase inversion.

The so-called Flickr phenomenon is that the picture will flicker, but it is not a visual effect made deliberately, but because the gray scale of the displayed picture will change slightly every time the picture is updated, making the human eye feel that the picture is flickering. This is most likely to happen using the polarity transformation method of frame by frame phase inversion. Because the whole picture of phase inversion frame by frame is of the same polarity, when the picture is positive this time, it will become negative next time. If there is a little error in the common voltage, then the same gray-scale voltage of positive and negative polarity will be different. Of course, the feeling of gray-scale is also different, as shown in Figure 2. In the case of constantly switching pictures, the Flickr phenomenon will appear because the positive and negative pictures appear alternately. Although there will be such a Flickr phenomenon in the polarity transformation mode of other panels, it will not be obvious to the human eye because it is different from the frame by frame inversion, and the polarity of the whole picture changes at the same time, only one row or column, or even one point changes polarity.

The so-called crosstalk phenomenon refers to the fact that the data to be displayed between adjacent points will affect each other, so that the displayed picture will be incorrect. Although there are many causes of ctosstalk phenomenon, as long as the polarity of adjacent points is different, the occurrence of this phenomenon can be reduced.

Working principle of TFT LCD:

How does TFT work? TFT is the abbreviation of “thin film transistor”, which generally refers to thin-film liquid crystal display, but actually refers to thin-film transistor (matrix) – it can “actively” control each independent pixel on the screen, which is the origin of the so-called active matrix TFT. So how does the image come into being? The basic principle is very simple: the display screen is composed of many pixels that can emit light of any color. As long as you control each pixel to display the corresponding color, you can achieve the goal. In TFTLCD, backlight technology is generally used. In order to accurately control the color and brightness of each pixel, a switch similar to a shutter needs to be installed behind each pixel. When the “shutter” is opened, the light line can pass through, while when the “shutter” is closed, the light cannot pass through. Of course, technically, the implementation is not as simple as just said.

LCD (liquid crystal display) uses the characteristics of liquid crystal (it is liquid when heated and solid when cooled). Generally, liquid crystal has three forms:

Smectic liquid crystal similar to clay

Nematic liquid crystal similar to a thin matchstick

Cholesteric liquid crystal

The liquid crystal display uses filaments. When the external environment changes, its molecular structure will also change, so it has different physical properties – it can achieve the purpose of allowing light to pass or blocking light – that is, the shutter just mentioned.

You know the three primary colors, so each pixel on the display screen needs to be composed of three similar basic components introduced above, which control the red, green and blue colors respectively.

At present, twisted nematic TFT LCD is the most commonly used. The following figure explains the working principle of this kind of TFT display. The existing technologies are very different, and we will introduce them in detail in the second part of this article.

There are grooves on the upper and lower layers, of which the grooves on the upper layer are arranged vertically and the grooves on the lower layer are arranged horizontally. The lower layer is arranged horizontally. When the liquid crystal without voltage is in a natural state, the light emanating from the schematic layer of the twisted nematic TFT display working principle in the light-emitting figure 2A will be distorted by 90 degrees after passing through the interlayer, so that it can pass smoothly through the lower layer.

When a voltage is applied between the two layers, an electric field will be generated. At this time, the liquid crystals will be arranged vertically, so the light will not be twisted – as a result, the light cannot pass through the lower layer.

According to the color, color filters are divided into red, green and blue, which are arranged on the glass substrate in turn to form a group (dot pitch) corresponding to a pixel. Each monochromatic filter is called sub-pixel. In other words, if a TFT display supports 1280 at most × 1024 resolution, then at least 1280 is required × three × 1024 sub pixels and transistors. For a 15 inch TFT display (1024 × 768) then a pixel is about 0.0188 inch (equivalent to 0.30mm), for 18.1 inch TFT display (1280 × 1024), which is 0.011 inch (equivalent to 0.28mm). As we all know, pixels are decisive for the display. The smaller each pixel is, the larger the maximum resolution the display may achieve. However, due to the physical characteristics of transistors, the size of each pixel of TFT is basically 0.0117 inch (0.297mm), so for a 15 inch display, the maximum resolution is only 1280 × 1024。

Polarity conversion mode of TFT LCD panel:

The driving voltage of liquid crystal molecules cannot be fixed at a certain value, otherwise, as time goes by, the liquid crystal molecules will polarize and gradually lose their optical rotation characteristics. Therefore, in order to avoid the destruction of the characteristics of liquid crystal molecules, the driving voltage of liquid crystal molecules must be polarity changed, which requires the display voltage in the liquid crystal display screen to be divided into two polarity, one is positive polarity, the other is negative polarity. When the voltage of the display electrode is higher than that of the common electrode, it is called positive polarity; When the voltage of the display electrode is lower than that of the common electrode, it is called negative polarity. Whether it is positive or negative, there will be a group of gray scales with the same brightness, so when the absolute value of the pressure difference between the upper and lower layers of glass is fixed, the gray scales are exactly the same. However, in these two cases, the rotation of liquid crystal molecules is completely opposite, which can avoid the above-mentioned destruction of characteristics when the rotation of liquid crystal molecules is always fixed in one direction. There are four common polarity transformation modes, namely, frame by frame phase inversion mode, line by line phase inversion mode, column by column phase inversion mode and point by point phase inversion mode.

For the frame by frame inversion mode, in the same frame, all adjacent points of the whole picture have the same polarity, while the polarity of adjacent frames is different; For the line by line phase inversion mode, the same polarity exists on the same line, while the polarity of adjacent lines is different; For the column by column phase inversion mode, the same polarity exists in the same column, while the polarity of adjacent columns is different; For the point by point phase inversion mode, the polarity of each point is different from its adjacent upper, lower, left and right points.

At present, most of the panel polarity conversion methods used by the common personal computer LCD are point-by-point conversion methods. Why? The reason is that the display quality of phase inversion point by point is much better than other transformation methods. The table lists the performance comparison of four polarity transformation modes: frame by frame phase inversion, line by line phase inversion, column by column phase inversion and point by point phase inversion.

The so-called Flickr phenomenon is that the picture will flicker, but it is not a visual effect made deliberately, but because the gray scale of the displayed picture will change slightly every time the picture is updated, making the human eye feel that the picture is flickering. This is most likely to happen using the polarity transformation method of frame by frame phase inversion. Because the whole picture of phase inversion frame by frame is of the same polarity, when the picture is positive this time, it will become negative next time. If there is a little error in the common voltage, then the same gray-scale voltage of positive and negative polarity will be different. Of course, the feeling of gray-scale is also different, as shown in Figure 2. In the case of constantly switching pictures, the Flickr phenomenon will appear because the positive and negative pictures appear alternately. Although there will be such a Flickr phenomenon in the polarity transformation mode of other panels, it will not be obvious to the human eye because it is different from the frame by frame inversion, and the polarity of the whole picture changes at the same time, only one row or column, or even one point changes polarity.

The so-called crosstalk phenomenon refers to the fact that the data to be displayed between adjacent points will affect each other, so that the displayed picture will be incorrect. Although there are many causes of ctosstalk phenomenon, as long as the polarity of adjacent points is different, the occurrence of this phenomenon can be reduced.

Working principle of TFT LCD:

How does TFT work? TFT is the abbreviation of “thin film transistor”, which generally refers to thin-film liquid crystal display, but actually refers to thin-film transistor (matrix) – it can “actively” control each independent pixel on the screen, which is the origin of the so-called active matrix TFT. So how does the image come into being? The basic principle is very simple: the display screen is composed of many pixels that can emit light of any color. As long as you control each pixel to display the corresponding color, you can achieve the goal. In TFTLCD, backlight technology is generally used. In order to accurately control the color and brightness of each pixel, a switch similar to a shutter needs to be installed behind each pixel. When the “shutter” is opened, the light line can pass through, while when the “shutter” is closed, the light cannot pass through. Of course, technically, the implementation is not as simple as just said.

LCD (liquid crystal display) uses the characteristics of liquid crystal (it is liquid when heated and solid when cooled). Generally, liquid crystal has three forms:

Cholesteric liquid crystal

Nematic liquid crystal similar to a thin matchstick

Smectic liquid crystal similar to clay

The liquid crystal display uses filaments. When the external environment changes, its molecular structure will also change, so it has different physical properties – it can achieve the purpose of allowing light to pass or blocking light – that is, the shutter just mentioned.

You know the three primary colors, so each pixel on the display screen needs to be composed of three similar basic components introduced above, which control the red, green and blue colors respectively.

At present, twisted nematic TFT LCD is the most commonly used. The following figure explains the working principle of this kind of TFT display. The existing technologies are very different, and we will introduce them in detail in the second part of this article.

There are grooves on the upper and lower layers, of which the grooves on the upper layer are arranged vertically and the grooves on the lower layer are arranged horizontally. The lower layer is arranged horizontally. When the liquid crystal without voltage is in a natural state, the light emanating from the schematic layer of the twisted nematic TFT display working principle in the light-emitting figure 2A will be distorted by 90 degrees after passing through the interlayer, so that it can pass smoothly through the lower layer.

When a voltage is applied between the two layers, an electric field will be generated. At this time, the liquid crystals will be arranged vertically, so the light will not be twisted – as a result, the light cannot pass through the lower layer.

According to the color, color filters are divided into red, green and blue, which are arranged on the glass substrate in turn to form a group (dot pitch) corresponding to a pixel. Each monochromatic filter is called sub-pixel. In other words, if a TFT display supports 1280 at most × 1024 resolution, then at least 1280 is required × three × 1024 sub pixels and transistors. For a 15 inch TFT display (1024 × 768) then a pixel is about 0.0188 inch (equivalent to 0.30mm), for 18.1 inch TFT display (1280 × 1024), which is 0.011 inch (equivalent to 0.28mm)

The post Detailed Explanation of TFT LCD Technical Specification - LCD manufacturers first appeared on Sinocrystal.

LCD module is a liquid crystal display device, connections, integrated circuits, PCB circuit boards, backlight, structural components assembled together components. The English name is “LCD Module”, referred to as “LCM”.

In fact, it is a kind of commercialized components. According to the relevant national standards in China: only the non-detachable integrated parts are called “modules”, and the detachable ones are called “components”. So the standard call should be called “liquid crystal display components”. But since a long time people have been accustomed to call it “module”.

In a broad sense, all the components assembled together by the LCD device and integrated circuit belong to the “module”, but in fact we usually say “module” mainly refers to the dot matrix LCD device assembly of the dot matrix LCD module, especially because it is a dot matrix Liquid crystal display device products in addition to some special high-volume varieties (such as translation machines, communications with), the manufacturer is directly to the user supply LCD devices, almost all general-purpose dot matrix LCD devices are processed into modules before supplying the user, so it is easy to form “LCD module” is “dot matrix LCD module” misunderstanding.

First: Dot matrix Character LCD Module

It is by the dot matrix character LCD devices and special line, column driver, controller and the necessary connections, structural components assembled from, can display digital and Western characters. This kind of dot matrix character module itself has character generator, large display capacity and rich functions.

Generally this kind of module can also display at least 8-bit 1 line or 16-bit l line or more characters. The dot matrix arrangement of this module is composed of a group of 5×7, 5×8 or 5×11 pixel matrix arrangement. Each group is 1 bit, and there is a bit of interval between each bit and a line of interval between each line, so it cannot display graphics, and its specifications are mainly shown in the following table.

8 bits

1 line;2 lines

16 bits

1 line;2 lines;4 lines

20-bit

1 row;2 rows;4 rows

24-bit

1 line;2 lines;4 lines

32-bit

1 line;2 lines;4 lines

40 bit

1 line;2 lines;4 lines

Generally in the module control, the driver has been solidified in the 192 character font CGROM character library, but also has a user-defined to build a special character random memory CGRAM, allowing users to build eight 5 × 8 dot matrix characters.

Second: dot matrix graphic LCD module

This kind of module is also a kind of dot matrix module, which is characterized by continuous arrangement of dot matrix pixels, with no empty space in both rows and columns in the layout. Therefore, a continuous and complete graphic can be displayed. Since it is also composed of X-Y matrix pixels, it can also display characters in addition to graphics.

1. Row and column driver type This is a kind of module that must be connected to a special controller, and its module is only assembled with general-purpose row and column drivers, which actually only have general drive outputs for pixels, while the inputs generally only have data inputs below 4 bits, shift signal inputs, latch inputs, AC signal inputs, etc., such as HD44100, IID66100, etc.

This type of module must be connected to an external control circuit, such as HD61830, SEDl330, etc. in order to connect to the computer. This type of module is the most numerous and most common. Although it needs to use its own controller, but it also leaves the customer the freedom to choose different controllers.

1. Row and column drive-control type

This is a module that can be directly interfaced with a computer and relies on the computer to directly control the drive. The column driver used in this type of module has an I/O bus data interface, so the module can be directly hooked up to the computer’s bus, eliminating the need for a dedicated controller, and therefore is beneficial to the overall system cost reduction. It is very suitable for users who do not have a large number of pixels, do not have many functions in the whole machine, and are familiar with the programming of computer software. However, it will take up some of your system’s resources.

1. Row and column control type

This is a type of dot matrix graphics module with built-in controller. It is also one of the more popular types. This type of module is not only equipped with row and column drivers such as the first type, but also equipped with special controllers such as T6963C.

This controller is the interface between the LCD driver and the computer, it is controlled by the computer in the simplest way, receives and feeds back various information from the computer, realizes the management of the display buffer through its own independent information processing, provides the driver with various signals and pulses needed to manipulate the driver to achieve the display function of the module.

This controller has its own set of special instructions and has its own character generator CGROM. Users must be familiar with the detailed instructions of this controller in order to carry out a summary. This kind of module makes the user get rid of a series of work on the design, processing and production of the controller, and also makes the computer avoid the tedious control of the display, saving the internal resources of the host system.

The above for you to introduce the character LCD and graphics LCD, if you are interested and want to understand this aspect, you can consult our official website, professionals will immediately communicate with you, to answer your questions!

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