Grid driving circuit applied to liquid crystal displays
A gate drive circuit and liquid crystal display technology, applied in static indicators, instruments, etc., can solve problems such as increased circuit power consumption, large number of thin film transistors, high circuit failure risk, etc., to achieve narrower borders and reduce circuit power Consumption, improve the effect of reliability
Active Publication Date: 2016-12-14
NANJING CEC PANDA LCD TECH
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Problems solved by technology
At present, the commonly used gate drive circuit (GDM) adopts the design scheme of 13T1C, such as image 3 As shown, it is composed of 13 thin film transistors (TFT) and 1 bootstrap capacitor. The main technical disadvantages of this circuit are: the number of thin film transistors used is relatively large, which is not conducive to the realization of narrow frame design, and will also increase the power consumption of the circuit; During the normal display scan period, the gate scan signal output cannot be maintained all the time, and there is a high risk of circuit failure
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[0022] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0023] The present invention will be described by taking the gate drive circuit of any stage in odd rows as an example. Such as Figure 4 As shown, the gate drive circuit of the present invention includes a precharge module 1 , a special maintenance module 2 , a node clearing module 3 , a gate scanning signal maintenance module 4 , a gate scanning signal driving module 5 and a bootstrap capacitor 6 . The connection node between the pre-charging module 1 and the driving module 5 for the pole scanning signal is the pull-up control node netAn.
[0024] The specific circuit of the gate drive circuit is: pre-charge module 1, which is composed of the first thin film transistor M1, the source of the first thin film transistor M1 is connected to the gate scanning signal G of the previous stage n-2 , the gate of the first thin film t...
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The invention discloses a grid driving circuit applied to liquid crystal displays. The grid driving circuit comprises a pre-filling module, a special maintaining module, a node emptying module, a grid scanning signal maintaining module, a grid scanning signal driving module and a bootstrap capacitor, wherein the pre-filling module is connected to a grid scanning signal of a preceding stage; the pre-filling module is connected with the special maintaining module, the node emptying module, the grid scanning signal maintaining module and the grid scanning signal driving module respectively; the grid scanning signal maintaining module is connected with the node emptying module, the grid scanning signal driving module and the bootstrap capacitor respectively; the special maintaining module, the node emptying module and the grid scanning signal maintaining module are connected with constant-voltage low potential; the grid scanning signal maintaining module and the grid scanning signal driving module are connected with a node output grid scanning signal.
Description
technical field [0001] The invention relates to a gate drive circuit, in particular to a gate drive circuit for a liquid crystal display. Background technique [0002] Now narrow bezel or even bezel-less design has become a major development trend of mobile phones, and consumers are pursuing higher and higher screen-to-body ratios. The basic structural diagram of the mobile phone panel is as follows: figure 1 As shown, the drive of the data signal source (Source) adopts the traditional COG (Chip on Glass) technology, that is, the driver of the data signal source is installed on the LCD panel; the gate driver circuits (Gate Driver Monolithic, GDM) on both sides adopt New integration technology, directly integrated on the LCD panel. Such as figure 2 As shown, the gate drive circuit of the mobile phone panel generally adopts a staggered design of unilateral drive. The gate drive circuit on one side is responsible for driving the odd-numbered rows, and the gate drive circuit...
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IPC IPC(8): G09G3/36
CPCG09G3/3677G09G2310/0286G09G2300/0426G09G3/20G09G2300/0809G09G2310/08
Inventor 戴超王志军
Owner NANJING CEC PANDA LCD TECH