Gate Drive Pulse Circuit for Pixel Electrode Pre-Charging
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Solution Overview
Problem
In liquid display devices, the increasing resolution leads to shorter turn-on times for thin film transistors, resulting in insufficient charge of pixel electrodes, which adversely affects the display effect due to reduced charging time and mutual polarity influence between adjacent pixel electrodes.
Innovation Solution
A pulse generation device and gate drive circuit with a cascade multi-stage shift register configuration that allows for pre-charging of pixel electrodes during the charging time of adjacent rows, ensuring equal pre-charging and charging times and synchronized polarity reversal, thereby increasing the charging time of pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If resolution is increased, then display quality is improved, but turn-on time of thin film transistor is shortened
Solution Approach 1:
The patent applies preliminary action by pre-charging the pixel electrode before the thin film transistor turn-on period. A pre-charge transistor is activated before the main switching transistor to charge the pixel electrode to an initial voltage level, ensuring that when the main transistor turns on, there is sufficient time to complete the charging process even at high resolutions.
2Productivity
If turn-on time is shortened, then charging time is reduced, but pixel electrode charge becomes insufficient
Solution Approach 1:
The pixel electrode is pre-charged to an initial voltage level before the thin film transistor turn-on period begins. This preliminary charging action ensures that when the main switching transistor activates, the pixel electrode already has sufficient charge headroom to reach the target voltage within the shortened turn-on time, thereby maintaining charge sufficiency despite reduced charging duration.
Solution Approach 2:
The patent implements continuous useful action by overlapping the pre-charge phase with the subsequent charging phase. The pre-charge transistor operates first, then transitions to the main charging operation without significant interruption, ensuring continuous voltage buildup on the pixel electrode throughout the available time window.
3Productivity
If adjacent pixel electrodes have opposite polarity, then display refresh is achieved, but mutual polarity influence causes charge insufficiency
Solution Approach 1:
The patent applies local quality by independently controlling the pre-charge voltage applied to each pixel electrode based on its specific polarity requirements and adjacent pixel states. Different regions of the display can have different pre-charge voltage levels tailored to their local polarity configuration, thereby mitigating mutual polarity influence while maintaining overall refresh functionality.
Data Source
AI summary
Embodiments of the present disclosure provide a pulse generation device, an array substrate, a drive circuit and a driving method. The pulse generation device includes: a reset module making a pulse output end output low level, in response to a low level of a first input end or in response to a low level of a second input end and a low level of a third input end; a pulse generation module making the pulse output end output a high level, in response to a high level of the first input end, a high level of the second input end and a low level of the third input end or in response to a high level of the first input end, a low level of the second input end and a high level of the third input end.