Incoming Inspection Specification for AUO 12.1-inch G121EA Series A-grade TFT-LC
Date:2026-04-02
Incoming Inspection Specification for AUO 12.1-inch G121EA Series A-grade TFT-LCD Modules
I. One paragraph summary
This document is the G121EA series 12.1-inch A-level TFT-LCD module feeding inspection specification that came into effect on November 27, 2018, from AU Optronics. It specifies the scope of application, inspection cycle, sampling standards, environmental conditions, defect grading (serious/minor), electrical/appearance/TP inspection standards, and is based on * * ANSI/ASQ Z1.4-2003 Level II, AQL serious 1.0%/minor 2.5% * * for judgment. At the same time, it provides usage precautions for customer acceptance of AU's shipped screens.
II. Mind map
III. Detailed summary
1. Basic information of the document
Document Name: Incoming Inspection Standard For 12.1 "(G121EA Series) (A grade)
Effective Date: November 27, 2018
Version: V0
Applicable object: AU G121EA series 12.1-inch TFT-LCD module (including TP/cover products)
2. General rules for inspection
Inspection cycle: The buyer shall complete the inspection within 20 natural days after the arrival of the goods, and any delay shall be deemed as qualified.
Sampling standard: ANSI/ASQ Z1.4-2003, normal inspection, single sampling Level II。
AQL standard:
Major: AQL=1.0%
Minor: AQL=2.5%
3. Testing environment and instruments
table
Project | standard value |
Temperature | 20~25℃ |
Humidity | 65±5%RH |
Illuminance | 300~700lux（standard 500lux） |
Observation distance | 35±5cm，vertical ±10° |
Instrument | Signal generator, driver board, BM-7 brightness meter |
4. Defect classification
Serious malfunction: causing functional failure or significantly reducing availability.
Minor defect: does not affect use, only slightly deviates from appearance.
5.Electrical Inspection Specification (Core)
Table:
inspection item | judgment criteria |
line defect | not allowed |
highlight | ≤2个 |
dark spot | ≤3个 |
Total point defects | ≤3个 |
Continuous highlights | Two are not allowed; ≥ 3 not allowed |
Continuous dark spots | 2 ≤ 1 pairs; ≥ 3 not allowed |
Distance between defect points | Highlight/Dark Spot/Between Light and Dark Spots * * ≥ 15mm** |
Mura | Use a 5% ND filter for normal brightness; Use 1% ND filter for 1000nits and above |
afterimage | 5-second screen, disappears within 5 seconds after switching |
6. Appearance Inspection Standards (Core)
1. Polarizing film particles/scratches/dents/bubbles
D ≤ 0.15mm: not included
0.15<D ≤ 0.50mm: Quantity ≤ 3
D> 0.50mm: Not allowed
2. Linear defects (width W/length L)
W ≤ 0.03 and L ≤ 0.5: not included
0.03<W ≤ 0.07 and 0.5<L ≤ 2.0: ≤ 3
W> 0.07 or L>2.0: Not allowed
3. Border gap
The gap between the front frame and the glass is W<0.8mm
4. Labels
The handwriting is legible, the barcode is scannable, and the position is correct
5. Screws/connectors
Screws are indispensable/loose; Connectors do not affect functionality
7. TP (Touch Screen) Appearance Standard
Table:
Defect Type | Criteria for judgment |
linear defect | L ≤ 3mm or W ≤ 0.1mm are not considered; Exceeding the standard is not allowed |
Point defect | D ≤ 0.2mm is not counted; 0.2<D ≤ 0.5mm ≤ 3 pieces |
BM pinhole | D ≤ 0.1mm is not considered; 0.1<D ≤ 0.2mm ≤ 2 (spacing ≥ 5mm) |
Glass edge chipping | Corner X/Y ≤ 2mm, Z ≤ 1/2 glass thickness; No extended cracks |
Glass crack | Completely not allowed |
8.Inspection and judgment
Defect count ≤ AQL acceptable level: acceptable
Defects>AQL acceptance level: Rejected, written notification to AU is required
9. Precautions for use
Prohibit twisting, heavy pressure, and electrostatic contact
Avoid prolonged fixation of the image that may result in afterimages
Disassembly and assembly must be powered off
Prevent temperature fluctuations, condensation, and damage to polarizing film/TP
IV. Key issues
What are the sampling standards and AQL for incoming inspection?
Answer: Sampling is based on ANSI/ASQ Z1.4-2003 Level II single normal inspection; Serious defect AQL=1.0%, minor defect AQL=2.5%.
What are the core requirements for bright spots, dark spots, and spacing in electrical inspection?
Answer: There are ≤ 2 bright spots, ≤ 3 dark spots, and ≤ 3 total defect points; The distance between any two bright spots/dark spots/bright and dark spots must be ≥ 15mm; consecutive 2 bright spots are not allowed, and any defects in consecutive 3 or more points are not allowed.
What are the criteria for determining circular defects on polarizing films during appearance inspection?
Answer: The average diameter D ≤ 0.15mm is not included; 0.150.50mm is not allowed * *.
AUO 12.1-inch G121EA TFT LCD:https://www.auo-lcd.com/products/auo-lcd-screen/12_1inch/
