Odd Even Gate Line Driving for LCD Charging and Defect Prevention
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Solution Overview
Problem
Liquid crystal display (LCD) technologies face challenges in achieving sufficient charging rates for data voltage and preventing horizontal line defects, which affect display quality.
Innovation Solution
The method involves dividing gate lines into odd and even numbered lines and applying specific gate signals during consecutive subframes, with precharging pixels using previous pixel voltages, to ensure sufficient charging and prevent defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gate signal driving is used, then the display panel can operate, but horizontal line defects occur and charging rate is insufficient
Solution Approach 1:
The gate lines are divided into odd-numbered gate lines and even-numbered gate lines, which are driven by separate gate drivers. This segmentation allows independent control of different gate line groups, enabling the odd gate driver to drive odd gate lines during first and third subframes while the even gate driver drives even gate lines during second and fourth subframes, thereby preventing horizontal line defects and improving display quality
Solution Approach 2:
The patent implements precharging of pixels before the actual data voltage is applied. During the precharge period, a precharge voltage is applied to the gate lines to prepare the pixels for subsequent data voltage application. This preliminary action ensures sufficient charging rate and prevents horizontal line defects by ensuring pixels are properly charged before displaying image data
2Productivity
If gate lines are driven sequentially without division, then device complexity is low, but charging rate for data voltage is insufficient
Solution Approach 1:
The gate driver is segmented into multiple independent gate drivers (odd gate driver and even gate driver), each responsible for driving specific gate lines. This segmentation enables parallel operation where different gate line groups can be charged simultaneously through their respective drivers, significantly improving the overall charging rate despite increased device complexity
Solution Approach 2:
The patent employs periodic subframe-based driving where odd and even gate lines are activated in alternating periods. During first and third subframes, odd gate lines are active while even gate lines are precharged or inactive, and vice versa during second and fourth subframes. This periodic action allows systematic charging of all gate lines while maintaining high charging rates through coordinated parallel operations
Data Source
AI summary
A method of driving a display panel is disclosed. In one aspect, the display panel includes a plurality of pixels arranged in odd and even rows and a plurality of odd and even gate lines respectively connected to the pixels of the corresponding odd and even rows. The method includes outputting odd gate signals to the odd numbered gate lines during two consecutive subframes and outputting even gate signals to the even numbered gate lines during two consecutive subframes. A frame is divided into two subframes.