LCD Screen Quality Control
Published date: 2018/8/8

Quality Control.jpg


Electrical Inspection & Visual Inspection Process

1. Product Specification Confirmation:

Confirm the products on the production line are consistent with order details, such as : color, size, model.


2. FPC Cable:

Check if the FPC is damaged or broken, and check if the connector is deformed or missing.


3. Touch Test:

Use the suspension ball as a test fixture, slide it along the edge of the display area. Need to comfirm one-third of the suspended ball outside the display area. No bad phenomena can occur, such as breakpoints, splash screens or fozen suspension ball.


4. 3D Test:

Use the lock screen wallpaper as a test fixture, press the center of it for 1 second until the corresponding command is given, then press and hold the suspension ball to enter the main test screen. No bad phenomena can occur, such as lagging screen and splash screen.


5. Black Test Interface:

Check whether FOG has highlights or crush, whether up polarizer has foreign objects, and whether the black interface displays normal color.


6. White Test Interface:

Check ehether FOG has highlights, whether TP and down polarizer have foreign objects, whether B/L is scratched by foreign objects, whether the bonding of TP and B/L has offset, whether the white interface displays normal color.


7. Gray Test Interface:

Check whether FOG has highlights, whether the gray interface is strped and mottled and whether the gray interface displays normal color.


8. Plaid Test Interface:

Assists in the determination of bad foreign objects, such as the foreign objects of up and down polarizer.


9. QC Seal:

Complete the above test and stamp the corresponding QC seal according to the judgment standard.


Electrical Inspection Judgment Standard


A+ Grade: All the interfaces display normaly, no dust, no dots.


A Grade: The glass has a bad liquid crystal point or an inconspicuous foreign object but less than or equal to 0.1mm-0.2mm. The glass has more than two connected foreign objects but less than or equal     to 0.1mm-0.2mm, and not in display area A if the distance is more than 3mm ( bending linear foreign object must not have ).


B Grade: The bad liquid crystal point of the glass is less than or equal to 0.3mm, and the inconspicuous foreign object of the glass is between 0.2mm-0.3mm. The number of foreign objects can not more than 3 and can not in display area A if the distance is more than 3mm ( bending linear foreign object must not have ).


C Grade: The glass itself is bad and can not be repaired but dose not affect the normal use ( such as: 4/1 glass line, slight liquid leakage, crush, starry sky, gray mottled, etc. ) can be treated as grade C.


Fingerprint / Lighting Visual Inspection Process


1. Confirmation Of Product Specifications: Confirm that the online products are consistent in the production work order, such as: color, specification, model


2. Fingerprit Test: Use the fingerprint test box to test the product with plan. When testing, it is necessary to avoid the terminal part of the product fro testing. Connect the test box and use the induction cotton to press the 3D connector test box to dispaly " good fingerprint ", and the test is bad. If the fingerprint is bad, it needs to be placed separately and returned.

3. Lighting Test: Use the lighting test box to light up the product before entering the warehouse. It is necessary to confirm that the product display color is normal, the screen is not abnormal, and the backlight is not leaking. It is necessary to ensure that all the products in the warehouse are normal.

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