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Test circuit and working method of gate drive circuit of liquid crystal display panel

A gate drive circuit, liquid crystal display panel technology, applied in static indicators, instruments, etc., can solve problems such as signal attenuation, achieve the effect of improving the effect, avoid heavy RC load, and avoid the risk of missed detection

Active Publication Date: 2020-02-07
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this design can avoid the risk of GOA circuit missed detection when testing the GOA circuit, but in the HVA curing process, due to the large size of the panel, the unilateral GOA circuit driving the panel will cause serious problems due to the heavy RC load. signal attenuation

Method used

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  • Test circuit and working method of gate drive circuit of liquid crystal display panel
  • Test circuit and working method of gate drive circuit of liquid crystal display panel
  • Test circuit and working method of gate drive circuit of liquid crystal display panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Figure 6 is the first embodiment of the present invention, and figure 2 The circuit design in is similar. Figure 6 The GOA test panels in the test are also all connected to the HVA process lines. but with figure 2 The difference is that in addition to the four clock signals in the peripheral circuit, the STV signal, LC1 signal and LC2 signal are all split according to the left and right sides. Specifically, the STV is split into the left STVL of the Q-point potential raising signal and the right STVR of the Q-point potential raising signal, which are used to provide STV signals to the GOA circuits on the left and right sides respectively. LC1 is split into a first pull-down circuit control signal left LC1L and a first pull-down circuit control signal right LC1R, which are used to provide LC1 signals to the left and right GOA circuits respectively. LC2 is split into a second pull-down circuit control signal left LC2L and a second pull-down circuit control signal ...

Embodiment 2

[0065] When using the liquid crystal panel test circuit provided in Embodiment 1 to carry out the GOA test process, it is only necessary to add different signals to the left and right GOA circuits through the left and right GOA test panels to realize the inspection of the GOA circuits on both sides.

[0066] For example, when checking the GOA circuit on the left, you can add a corresponding signal to the GOA circuit on the left through the GOA test panel on the left, and turn off the GOA circuit on the right. The signal waveform required at this time is as follows Figure 7 shown. From Figure 7 It can be seen that the four clock signals at this time are respectively related to Figure 4 The four clock signals in the same, STVL and Figure 4 The STV in the same, LC1L and LC2L are also with Figure 4 LC1 and LC2 in are the same. Four clock signals, STVL, LC1L and LC2L, can ensure the normal operation of the left GOA circuit. If a stage in the left GOA circuit fails, there w...

Embodiment 3

[0070] Such as Figure 9 As shown, this embodiment improves the GOA circuit. Figure 9 The GOA circuit shown with image 3 In contrast, a thin film transistor Tx is added in each level of GOA unit. Wherein, the gate of the thin film transistor Tx is used to receive the newly added reset signal, and the source and drain of the thin film transistor Tx are respectively connected to the gate line Gn and the low voltage signal Vss.

[0071] The peripheral circuit connection of the improved GOA circuit is connected with Figure 6 Exactly the same, STV, LC1, and LC2 are still divided into six signals: STVL / R, LC1L / R, and LC2L / R according to the left and right sides, and the four CK signals are shared on both sides, and the newly added reset signal Resst is also on both sides shared.

[0072] During the GOA test, Resst is a low-potential DC signal, and other signals are the same as Figure 7 same. In this way, the GOA circuits on the left and right sides can be inspected separat...

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Abstract

The invention discloses a test circuit of a grid driving circuit of a liquid crystal display panel and an operating method of the test circuit, which relate to the technical field of liquid crystal display panel test. In the test circuit, control signals provided for grid driving circuits on left and right sides are mutually independent, all switching elements in the other grid driving circuit are closed when one grid driving circuit is tested, and the two grid driving circuits are normally operated in an HVA (High Vertical Alignment) curing process. According to the test circuit, time division test for the two grid driving circuits is realized, so that the phenomenon of missing inspection is avoided. In addition, according to the test circuit, a double-driving mode is adopted in the HVA curing process, so that the problems of heavy RC load and serious signal attenuation caused by a single-side GOA circuit driving panel in the prior art are solved, and the HVA curing effect is increased favorably.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a test circuit of a gate drive circuit of a liquid crystal display panel, and also to a working method of the gate drive circuit. Background technique [0002] Gate drive array technology has been widely used in LCD panels now, it can save the cost of the gate circuit (Gate IC), and can also reduce the width of the panel frame, which is very beneficial to the current popular narrow frame design and is the future panel design an important technology. [0003] Since the thin-film transistor (TFT) device made of amorphous silicon (a-Si) has weak driving capability, large-sized GOA (gate drive) panels generally adopt a dual-drive architecture. The two GOA circuits on both sides of the panel are connected to the same gate line. When the panel is working normally, both GOA circuits output the same signal. In a traditional GOA architecture panel, the GOA circuits on both sides are c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/00
CPCG09G3/006
Inventor 杜鹏
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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