Analysis of the causes of bad LCD screen
1. Short circuit: customers call it long-time beeping, beeping, short-shorting, light leakage. It is because the pull wires that should not be connected together in the LCD are connected together, and with the large current infinity (the electrical measurement scan will be called), some of the bytes displayed in the module are relatively light or missing.
2. Large current: The display on the module is light, fuzzy or battery loss is fast, if the power supply is powered, it can be regarded as normal, and the current is large during electrical measurement.
3. Open circuit: The customer calls this as less-scratch, missing-scratch, or broken-word. In fact, the ITO is scratched and disconnected, and what is seen on the module is also missing.
4. Insufficient etching: customers call it black dots, multi-points, and there is an extra pattern on the module or electric measuring machine.
5. Etching transition: customers call it thin and deformed characters, and a part of a certain byte is missing on the module or electric measuring machine.
6. Light word: refers to the higher Voff voltage. Customers generally call light word and light color; divided into two types (1 @ partial light word: caused by large current; 2
ï¼ Whole word: It is related to the liquid crystal ratio or process conditions. ) Judgment method: In the factory, the blackness of the sample font is compared with the sample at the same frequency and the same line of sight during electrical measurement. At the same time, when the voltage difference is greater than a certain range, the factory judges NG. On the module, the words are faint when they are fuzzy.
7. Ghost: the word depth is the same as the sample under the same voltage, and the word comparison is estimated to be deeper than the sample. The bytes that should not appear on the module are vague when they are not lit. Seeing, affecting the contrast.
8. Light leakage: some display bytes are lighter than others. The degree of ghosting of bytes that are not displayed is inconsistent, that is, uneven bytes.
9. Poor conductivity: customers call it flicker, byte flicker, unclear byte, poor contact, shaking, incomplete display, half display, lack of scratch ... The reason is that the conductivity is not good, and it is displayed under normal voltage during electrical measurement The display is too unstable for a single byte or a certain part of the byte, and the dot is blurred or not displayed. However, when the electrical tester is tested and the voltage is increased, it can be displayed normally, which is the difference from "open circuit".
10. Uneven surface: Customers generally refer to uneven grayscale, uneven display, uneven bytes, white dots, black dots, stains, etc. During electrical measurement, there will be a small white or black on the section of a word. A little bit, and these small points will generally shrink or expand with the frequency of the electric measuring machine and the size of the voltage, and the display of the module is also the same, so it is important for the factory to judge the surface unevenness is the frequency of the module. The output voltage .
11. Figure white: The customer calls it a word missing and a byte missing part. bad apperance
1. Internal contamination: customers call it black spots, stains, fibers. There is fiber in the LCD.
2. Internal scraping: customers call it black line and white line, PI is scratched as line scratches.
3. Uneven color: customers call it inconsistent color, rainbow, that is, the color of the LCD is uneven, the rainbow in the middle or the edge of the bar and the uneven color stripes, mainly in terms of color.
4. Background color does not match: generally refers to the overall color of the LCD is very different from the overall color of other LCDs. Generally, it is not compared with the sample, and the current process capability of our factory cannot be reached.
5. Damage: The customer calls the lens broken or broken. That is, the damaged part of the LCD is damaged, the corners and edges are damaged, and the conductive layer is damaged (that is, the side of the PIN is damaged, usually due to many human factors, which may be caused by both the company and the customer).
6. Poor cutting: Y-axis cutting and X-axis splitting cause some protrusions or depressions.
7. PIN Scratch: That is, the side of the LCD where the PIN is released (that is, the so-called conductive layer). The PIN is scratched or cut, causing a disconnection, poor conductivity, etc. It is easy to cause when the customer repairs.
8. The polarizer is scratched or punctured: customers call it mirror flowers and blurry mirror surfaces. That is, the polarizer is damaged or damaged by a hard hand such as a blade (the customer will cause improper placement).
9. Polarizer watermark: There is a streak on the polarizer, which can only be seen by the backlight. Because alcohol or acetone penetrates when the conductive layer is dirty with alcohol or acetone after the patch, the customer may also infiltrate when wiping the PIN .
10. No protective film: the protective film on the surface of the polarizer is removed. (Generally, the IC is broken. When repairing, the LCD is broken and removed.
11. Polarizer bubble: There are small bubbles on the polarizer on the LCD surface after patching, which affects the usability of the LCD (try to convince customers to accept it).
12. Anti-posting: customers call it wrong, referring to the reverse of the polarizing film, but the post should be posted on the next film.
13. Bumps, fibers: Dust, fibers and other contaminants fall onto the LCD surface or the polarized light is contaminated during placement.
14. Polarizer corrosion: That is, the polarizer undergoes a chemical reaction with certain liquids and is corroded to become discolored or deformed.
15. Mixing: There are different types and performances of products mixed, there are different types of mixtures mixed in versions, LCDs of foreign manufacturers are mixed, LCDs of different periods are mixed, and the logo on the conductive layer of the LCD is used as the basis for judgment .
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