亮点不良分析.pdf

A201SN01 V.5 Bright dot Failure Report TV Quality Service Issue date: 2004/ 12/14 AUO Proprietary Confidential Step 題定義/改善主題與目標設定 1 Problem definition / Improvement subject Target setup What Symptom : Bright dot Zoom in Fig1 Bright dot Step 現狀分析 2 Fact Data Finding analysis S/N: TR4800703228-ZM110 04/34 When : 2004/10/15 Who :L8BM1 History :No defect at AU process Step 真因分析與驗證 3 Root cause analysis and verification How: 1.Turn on Panel,defect as customer complain: Bright dot,as Fig1 2.Check the panel again,we can t see gap mura around bright dot area. 3.Finger touch the bright dot around area,we can see 5-8 bright dot 4.Check the panel by OM,we can see something abnormal under gate line, total about 10 to 20 point . Defect as Fig2 Fig2 Several abnormal under gate line Step 真因分析與驗證 3 Root cause analysis and verification How: 5.Decap CF TFT,we can see TFT side normal,CF side PS was crushed. Abnormal PS as Fig3,normal PS as Fig4 PS : Photo spacer. Fig3 Abnormal PS Fig4 Normal PS Step 真因分析與驗證 3 Root cause analysis and verification How: 6.Send the abnormal PS to L5 FIB analysis,FIB result as Fig5 Fig5 Abnormal PS FIB result PS 翹起,導致short 到TFT上 ITO,造成 bright dot 註: ITO : 銦錫氧化物 Step 真因分析與驗證 3 Root cause analysis and verification Notice : PS abnormal cause TFT CF ITO shorted