Liquid crystal module test device with display port (DP) interface and test method thereof

Abstract

The invention discloses a liquid crystal module test device with a display port (DP) interface and a test method thereof, which relate to the test field of liquid crystal modules. The liquid crystal module test device with the DP interface comprises a power supply processing unit, a field programmable gate array signal processing unit and a central processing unit (CPU) control unit, wherein the power supply processing unit and the field programmable gate array signal processing unit are connected with one liquid crystal module test interface; the liquid crystal module test interface is connected with a liquid crystal module to be tested; the power supply processing unit comprises a power supply processing module and a light emitting diode (LED) driving module; the CPU control unit and the field programmable gate array signal processing unit are both connected with one DP coding module which outputs a signal to the liquid crystal module to be tested; and the field programmable gate array signal processing unit comprises a built-in signal module, a low-voltage differential signaling decoding module and a low-voltage differential signaling coding module. According to the test device and the test method, a low-voltage differential signaling (LVDS) interface and the DP interface are simultaneously provided, an external input test signal and a built-in test signal are simultaneously supported, and LED backlight driving output is provided.

Description

technical field [0001] The invention relates to the testing field of liquid crystal modules, in particular to a liquid crystal module testing device and a testing method with a DP interface. Background technique [0002] LCD (Liquid Crystal Display, liquid crystal display) includes LED (Light Emitting Diode, light emitting diode) backlit liquid crystal display and CCFL (Cold Cathode Fluorescent Lamp, cold cathode fluorescent lamp) backlit liquid crystal display. LCD, especially LED-backlit liquid crystal display, has many advantages such as light and thin, low power consumption, low radiation, no flickering on the screen, and rich colors. market share. The main component of the LCD is a liquid crystal module (LCD Module), and the internal interconnection signal of the LCD module adopts LVDS (Low-Voltage Differential Signaling, low-voltage differential signal) or DP (DisplayPort, display interface) interface mode. The DP interface adds support for high-definition audio sign...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the design architecture and the limitation of the use of dedicated chips, the traditional LCD module test equipment has a single function and can only support the LVDS interface. It cannot support the LVDS interface and the DP interface at the same time, nor can it support the external input test signal source and the built-in test at the same time. Signal source, the traditional liquid crystal module testing device does not have a built-in LCD module LED backlight driver, or needs to add new equipment to realize the conversion of the interface. This kind of device is not only complicated in wiring and operation, but also has a single application; it may also lead to investment in new equipment. It greatly reduces the efficiency of testing and production, increases the cost of testing, and is not conducive to reliable automated testing and rapid production change of LCD modules

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