显示模组光电知识散射型光源开发analysis report of esd failure in pvt

1、VersionENGINEERING REPORT P / L DatePlace ModelChassisContentsTitle Sample Qty EventW/OrderProblem StatusCause MeasuresCause Division1.0 PV40E2000Skyworth ME Lab.16.09.13korea1/2Explanation for failure of ESDhuangyang lixia How to improveSolution:1. Pay attention to the operation of the conductive c

2、loth, make sure it attached right from the metal bar to the rear metal plate, strictly following the SOP.2. Strengthen the management of production process, and underline the assembly of conductive cloth . There is one machine failed in the ESD test. While tested at the condition of 8kv ESD discharg

3、e between plastic frame and open cell,1 of the 2 tested samples failed to continue lighting.Why 1It is a problem that lead to no image of open cell ;Why 2In the ESD test, the interference signal causes the latch-up of the opencells Power IC;Why 3There is a high resistance value between the conductiv

4、e cloth and the rear metal plate;Why 4Assembly operation of the conductive cloth does not conform to SOP strictly ;Root causeAbnormal assembly results in the high resistance value between the conductive cloth and the rear metal plate, finally causes the ESD failure.Step 1: measure the resistance val

5、ue between the conductive cloth and the rear metal plate. The left picture is the result of which we have tested before on the qualified machine . We has tested the resistance value between the conductive cloth and the rear metal plate on the failed one, and the measured value is too high ,as the pi

6、cture on the right side.Normal Resistance ValueAbnormal Resistance ValueStep 2: check the assembly of the conductive cloth to plastic frame.The conductive cloth attached to plastic frame: We open the front frame of the machine, but find no mistake of the conductive cloth attached to plastic frame.St

7、ep 3: check the assembly of the conductive cloth to rear metal plate.The conductive cloth attached to rear metal plate: We find wrong assembly of the conductive cloths attaching to rear metal plate. The left picture shows the right operation. The right picture is the wrong operation: (1) the conduct

8、ive cloth does not completely get in touch with the metal bar ; (2) the conductive cloth is partly posted on the non-conductive oil paint. RightWrongConclusion & SolutionConclusion: Abnormal assembly results in the high resistance value between the conductive cloth and the rear metal plate, finally causes the ESD failure.Solution: 1. Pay attention to the operation of the conductive cloth, make sure it attached right from the metal bar to the rear metal plate, stri