Liquid Crystal Display Gate Driver Segmentation for Flicker Reduction
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Solution Overview
Problem
Liquid crystal display devices face issues with screen flicker and image burn-in due to uneven field-through voltage, which affects display quality and causes voltage differences between odd and even frames.
Innovation Solution
The liquid crystal display device design includes a specific configuration of gate and source drivers, pixel switches, and control lines that ensure balanced field-through voltage across the display region by outputting drive signals and source control signals in a manner that reduces offset unevenness, using n-type thin-film transistors and transparent electrodes to manage the liquid crystal capacitance and auxiliary capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-ended gate driver configuration is used, then device complexity is reduced, but field-through voltage becomes uneven causing screen flicker and image burn-in
Solution Approach 1:
The gate driver is divided into two independent gate drivers (first gate driver and second gate driver) that respectively drive opposite ends of the gate lines. This segmentation allows independent optimization of drive signals for different regions, achieving balanced field-through voltage across the display panel and eliminating the flicker and burn-in issues caused by uneven voltage distribution.
2Reliability
If drive signals are applied without balanced configuration, then ease of operation is improved, but voltage differences between odd and even frames cause flicker
Solution Approach 1:
The patent implements preliminary balancing of the drive signals by configuring the two gate drivers to output signals with complementary phase relationships. This preliminary action ensures that voltage differences between odd and even frames are compensated before they can cause flicker, maintaining consistent display quality without requiring complex real-time adjustments.
3Reliability
If simple source control signal input is used, then device complexity is reduced, but offset unevenness affects display quality
Solution Approach 1:
The patent extracts the source control signal input from a single centralized point and distributes it to multiple input positions along the control lines. This extraction and redistribution approach enables independent optimization of control signals for different pixel columns, reducing offset unevenness and improving overall display quality while maintaining manageable device complexity.
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes pixel electrodes arranged in matrix, gate lines, source lines, pixel switches, gate drivers allocated at both ends of a display region, a source driver, image signal transmit lines arranged along the columns in which the pixel electrodes are arranged, each image signal transmit line supplying an image signal to each source line, switches arranged along the row direction, each switch configured to switch a connection between the source line and the image signal transmit line, and control lines configured to output source control signals to switch the switches, each control line outputting a source control signal to switch a plurality of the switches at the same time, wherein each source control signal is input to each control line at a position substantially the center of the gate line in the row direction.