Measuring method and device

Abstract

The present invention discloses a test method and a test device, and the test method comprises setting a series of voltage values which are a first voltage value, a second voltage value, ..., a (N-1)th voltage value, an Nth voltage value from small to big, providing test voltages to a liquid crystal display panel, wherein, the test voltages are the Nth voltage value, the first voltage value, the (N-1)th voltage value, the second voltage value, ...; measuring a transmittance rate of the liquid crystal display panel under the test voltage value respectively. Under the function of the test voltage, liquid crystal molecules are alternately symmetric and deflected for / backward, deformation of the liquid crystal molecules can be recovered in a short time, data test error can be reduced, accuracyof a VT curve can be improved, and data with higher precision can be provided for Gamma tuning.

Description

technical field [0001] The invention relates to performance testing of liquid crystal display panels, in particular to a testing method and device for voltage and transmittance curves. Background technique [0002] With the advent of the digital age, the comprehensive popularization of liquid crystal displays (Liquid Crystal Display, LCD for short) will become an inevitable trend in the development of the digital age. [0003] At present, the liquid crystal display panel is to install the liquid crystal between two substrates with fine grooves, so that the fine grooves on the two substrates intersect perpendicularly at 90 degrees. The upper substrate is called a color filter substrate, and its inner surface is deposited with a transparent conductive oxide (Transparent Conductive Oxide, referred to as TCO) layer as a transparent electrode (also called a common electrode); the lower substrate is called a thin film transistor (Thin Film Transistor, referred to as TFT) ) substr...

AI Technical Summary

Problems solved by technology

When the external voltage is continuously applied to the PCB, the electrons in the direction c of the current movement will continue to gather, such as Figure 8 As shown, it is a schematic diagram of the internal and external electric fields between the two LCD substrates in the prior art. When the test voltage u is applied in the E→F direction, an external electric field d is formed, and the internal electrons between the two LCD substrates gather. , in the F→E direction, an internal electric field e is formed inside the two substrates of the LCD, so that the internal and external electric fields e and d will cancel each other out, so that the voltage of the ITO layer of the lower TFT substrate becomes smaller, resulting in TCO between the ITO layer and the upper color filter substrate. The potential difference between the layers (+6V) increases, which easily causes the polarization of the liquid crystal, resulting in the liquid crystal molecular deformation cannot be recovered in a short period of time, so the Module VT Curve test method of the liquid crystal display panel in the prior art, both positive and negative There is a large error in the test data, which seriously affects the accuracy of the VT curve, and it is difficult to provide high-precision data for gamma tuning;

[0008]2. In the test method of the prior art, the adjustment of the test voltage, the reading and recording of the test data are all carried out manually, and one person must control the pressurization and measurement , reading, and another person cooperates to record the data

Due to the different deflection characteristics and response speeds of different liquid crystals, the change interval between data during the test process is unstable, which is easy to cause human errors and reduces the accuracy of test data.

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