Sinocrystal analyzes the laser used in the repair of TFT-LCD liquid crystal display -LCD manufacturer
In recent years, the field of active matrix liquid crystal displays has developed rapidly, and TFT-LCD liquid crystal displays have also undergone an iterative transition of large-size, color, and high-definition step by step. The rapid improvement of liquid crystal display technology will inevitably lead to a gradual increase in its cost, so improving the yield of devices has become a key to the overall cost reduction.
However, it is extremely difficult to arrange and fabricate millions of switching elements, thousands of scan lines and signal lines on a large-area glass substrate. Fine process optimization to avoid most of the TFT soft defects, but high-resolution color liquid crystal displays usually require 7 to 12 mask processing, mask defects and impurities caused by a large number of channels, sources, We can’t avoid hard defects such as shorting/opening of grids and bus lines. We can only eliminate them by using redundancy technology and laser repair technology.
1LCD open circuit laser repair technology:
For the open circuit repair in liquid crystal display screens , laser chemical vapor deposition (CVD) is generally used, that is, metal organic compounds are used as working gas, and metal atoms are deposited by Ar+ laser decomposition to form a metal line in the laser irradiation area. In this way, the circuit is turned on and off to form a laser repair.
2LCD short-circuit laser repair technology:
For the repair of short circuits in TFT-LCD liquid crystal displays , high-power YAG pulsed lasers are usually used. By irradiating the short circuit that needs to be cut off, the metal film is partially vaporized under strong pulses to repair the short circuit problem.
3DPS-A laser:
In response to the short-circuit repair problem in the field of TFT-LCD liquid crystal display, Changchun New Industry Optoelectronics has specially developed and launched the DPS-A laser. It adopts 1064/532nm dual-band technology and full air cooling. It can excite a large energy pulse of 10mJ, which is effective It removes most of the alloys and compounds such as the insulating layer, active layer, Al, Mo, Ta, CTO, gold, copper, etc. in the LCD, which perfectly handles all LCD screen defects caused by short circuits, and greatly improves the yield rate.
1 Product advantages:
1. CNI process laboratory provides you with process parameter optimization
2. The product is cost-effective and cost-effective, suitable for mass production of repair equipment in the professional field
3. 10mJ ultra-high pulse energy, the output energy can support laser repair of various large-format LCD screens
4. Military-grade repetitive energy stability (rms<3%) to ensure the stability and uniformity of the repair effect
5. The laser has an excellent spot pattern and a wide range of available energy, which can provide a larger process control range for laser repair
6. Using the coaxial embedded collimation process, it can use low-power 650nm continuous red light for laser focusing and collimation, reducing the difficulty of repair and artificial errors
2 Indicator parameters:
| Laser type | Nd-YAG LASER |
| Laser wavelength | 1064/532nm |
| pulse | Q-switch 5ns |
| Output Power | 0.5mJ~10mJ |
| operating frequency | 1~10Hz |
| Energy stability | <3% (Super high stability) |
| Light spot | <3mm |