CN202473177U

CN202473177U - Detection device for liquid-crystal module

Info

Publication number: CN202473177U
Application number: CN2012200315794U
Authority: CN
Inventors: 顾正华
Original assignee: Xiamen Zettler Electronics Co Ltd
Current assignee: Xiamen Zettler Electronics Co Ltd
Priority date: 2012-02-01
Filing date: 2012-02-01
Publication date: 2012-10-03
Anticipated expiration: 2022-02-01

Abstract

The utility model relates to the technical field of TFT-LCD detection, and specifically relates to a detection device for a liquid-crystal module. The device includes a detection support and a built-in detection circuit. The detection circuit comprises a master control chip, a JTAG circuit, a clock source, a reset circuit, a PWM backlight circuit, a dial switch, a digital potentiometer, a TFT power supply and a TFT screen interface. Input ports of the master chip are connected with output ports of the JTAG circuit, the clock source, the reset circuit and the dial switch. Output ports of the master chip are connected with the TFT screen interface and input ports of the PWM backlight circuit and the digital potentiometer. An output port of the digital potentiometer is connected with an input port of the TFT power supply. Output ports of the PWM backlight circuit and the TFT power supply are connected with the TFT screen interface. The device provides effective detections of defects of TFT-LEDs of different models, and is simple in structure, convenient in operation and maintenance, and low in cost.

Description

A kind of Liquid Crystal Module pick-up unit

Technical field

The utility model relates to the detection technique field of TFT-LCD, is specifically related to a kind of Liquid Crystal Module pick-up unit.

Background technology

As one of important key foundation of electronics and information industry; The following substituent of conventional picture tube technology, lcd technology changes, promotes upgrading of the industrial structure, drives aspect such as hi-tech development and plays an important role in the mode of promoting economic development.

TFT (Thin Film Transistor) LCD is TFT LCD, is a kind of in the active matrix type liquid crystal display (AM-LCD).Liquid crystal flat panel display; Special TFT-LCD is unique display device of on combination properties such as brightness, contrast, power consumption, life-span, volume and weight, catching up with comprehensively and surpass CRT at present, and its function admirable, large-scale production characteristic are good; Automaticity is high; The cost of raw material is cheap, and development space is wide, with the main product that becomes the new century rapidly.

But TFT-LCD normally has different models at present, so often need test the TFT-LCD screen of various different models, detects bad defective.The at present general electric logging equipment that adopts generally is that the TFT-LCD corresponding to a kind of model tests; When need test to the TFT screen of other models; Often need change different testing devices, bother very much, the also inconvenient performance that detects TFT-LCD at any time fast.

The utility model content

To the deficiency of prior art, the utility model provides a kind of Liquid Crystal Module pick-up unit, can adapt to the detection of the TFT screen of different model, and is simple in structure, easy to operate, and cost reduces with respect to existing pick-up unit greatly.

For achieving the above object; The utility model is realized through following technical scheme: a kind of Liquid Crystal Module pick-up unit; Comprise test bracket and built-in test circuit; Wherein test circuit comprises main control chip, jtag circuit, clock source, reset circuit, PWM backlight circuit, toggle switch, digital regulation resistance, TFT power supply, and TFT shields interface;

Said main control chip goes out inbound port and links to each other with the output port of jtag circuit, clock source, reset circuit, toggle switch, and said main control chip output port is connected with PWM backlight circuit, digital regulation resistance input port and TFT screen interface; The output port of said digital regulation resistance is connected with TFT power input mouth; The output port of said PWM backlight circuit output end mouth and TFT power supply links to each other with TFT screen interface.

Further, described main control chip is that model is the FPGA control chip of EPM240.

The beneficial effect of the utility model is: the utility model is input to the TFT pattern selection signal in the main control chip of CPLD through toggle switch; Automatically judge selected TFT screen and export corresponding data-signal for the TFT data line that by main control chip main control chip is adjusted the digital regulation resistance of the power supply of PWM backlight circuit and TFT automatically according to the TFT model simultaneously; The automatic output control signal; Detect the TFT-LCD picture displayed, effectively detect the defective of the TFT-LCD of different model, simple in structure; Operating maintenance is convenient, and is with low cost.The Liquid Crystal Module pick-up unit of the utility model can be tested the TFT-LCD module of all resolution in 3.5 " 10 " scope through selecting the suitable crystal oscillator frequency of CPLD main control chip.

Description of drawings

Fig. 1 is the structured flowchart of the utility model.

Embodiment

Combine accompanying drawing and embodiment that the utility model is further specified at present.

With reference to shown in Figure 1; A kind of Liquid Crystal Module pick-up unit of the utility model; Comprise test bracket and built-in test circuit; Wherein test circuit comprises main control chip 1, jtag circuit 2, clock source 3, reset circuit 4, PWM backlight circuit 5, toggle switch 6, digital regulation resistance 7, TFT power supply 8, and TFT shields interface 9; Described main control chip 1 is that model is the FPGA control chip of EPM240.

Said main control chip 1 goes out inbound port and links to each other with the output port of jtag circuit 2, clock source 3, reset circuit 4, toggle switch 6, and said main control chip 1 output port is connected with PWM backlight circuit 5, digital regulation resistance 7 input ports and TFT screen interface 9; The output port of said digital regulation resistance 7 is connected with TFT power supply 8 input ports; The output port of said PWM backlight circuit 5 output ports and TFT power supply 8 links to each other with TFT screen interface 9.

The beneficial effect of the utility model is: the utility model is input to the TFT pattern selection signal in the main control chip through toggle switch; Automatically judge selected TFT screen and export corresponding data-signal for the TFT data line that by main control chip main control chip is adjusted the digital regulation resistance of the power supply of PWM backlight circuit and TFT automatically according to the TFT model simultaneously; The automatic output control signal; Detect the TFT-LCD picture displayed, effectively detect the defective of the TFT-LCD of different model, simple in structure; Operating maintenance is convenient, and is with low cost.

Although specifically show and introduced the utility model in conjunction with preferred embodiment; But the those skilled in the art should be understood that; In the spirit and scope of the utility model that does not break away from appended claims and limited; Can make various variations to the utility model in form with on the details, be the protection domain of the utility model.

Claims

1. Liquid Crystal Module pick-up unit; Comprise test bracket and built-in test circuit; Wherein test circuit comprises main control chip, jtag circuit, clock source, reset circuit, PWM backlight circuit, toggle switch, digital regulation resistance, TFT power supply, and TFT shields interface;

2. a kind of Liquid Crystal Module pick-up unit according to claim 1 is characterized in that: described main control chip is that model is the FPGA control chip of EPM240.