Hangzhou Xuhong Technology Co.,Ltd
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The purpose of the aging test is to check the initial defects of the TFT LCD module and prevent unqualified products from entering the market. The aging test is completed in a high temperature environment, and the driving voltage of the TFT LCD screen should be adjusted to the most appropriate value before the high temperature aging.
1、 Voltage adjustment
In order to obtain the most appropriate driving voltage value of the TFT LCD module, we observe the voltage waveform through an oscilloscope to adjust the voltage value. If the voltage value is found to be beyond the specified range, the PCB substrate should be replaced. Voltage regulation is to adjust the positive and negative electrodes to the same value, if not same, there will be a picture flicker, and even appear residual image after high temperature aging. The fundamental reason for the picture flicker is the feedthrough phenomenon caused by the TFT switch structure in the pixel, which causes the pixel voltage deviating from the design value. Generally, we will adjust the voltage value by adjusting the flicker screen. If the flicker disappears, the voltage value is the best.
2、High temperature aging
The principle of failure curve is adopted in high temperature aging, so that unqualified products can accelerate deterioration and be eliminated as soon as possible. There are three stages of the failure rate curve: early failure period, accidental failure period, and wear-out failure period. The failure rate of the early failure period is high and decreases rapidly as the working time increases. Most failures at this stage are due to defects in the design, raw materials, and manufacturing processes. The purpose of high temperature aging is to shorten the time of this stage, so as to detect, correct and eliminate defects early. After high temperature aging, TFT LCD module enters the accidental failure period with very low failure rate to ensure the good operation of the product.
We attach great importance to the aging test of TFT LCD module, and now we have a professional aging laboratory. We will sample and aging TFT LCD products before shipment, the aging temperature is generally from -20°C to 70°C, and the time is 8 to 24 hours. After the aging, the aging car will be pushed out and the picture will be confirmed again. We will check and confirm whether each LCD module has display offset, uneven display and other adverse conditions.
AUO TFT LCD:https://www.auo-lcd.com/products/auo-lcd-screen/
