Liquid Crystal Display Source Line Division Driving Method
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Solution Overview
Problem
Liquid crystal display devices face issues with differences in display states between pixels adjacent to the divided position of a source line and other pixels due to uneven alignment film surfaces, leading to inadequate liquid crystal alignment and brightness variations.
Innovation Solution
The implementation of a division driving method where video wiring lines are divided and arranged to overlap with scanning wiring lines, with an expanded portion at the divided position to equalize wiring load, and the use of a light blocking film with convex portions to cover alignment control failure regions, ensuring uniform pixel aperture ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the source line is divided horizontally into upper and lower display regions to enable parallel scanning, then the data writing speed is improved, but the alignment film surface becomes uneven causing display state differences between pixels
Solution Approach 1:
The source line is divided into multiple segments corresponding to different display regions (upper and lower regions). Each segment is independently controlled and can be selectively connected to pixel rows, allowing parallel data writing to different regions while maintaining uniform alignment film formation in each segment.
Solution Approach 2:
Different portions of the source line (different segments) are given different properties - some segments are connected to pixel rows while others are not connected, depending on the scanning region. This local differentiation allows the alignment film to form uniformly in each local region while enabling overall parallel scanning across the entire display.
2Productivity
If the source line is divided into multiple display regions, then parallel scanning capability is improved, but pixels adjacent to the divided position exhibit brightness differences from other pixels
Solution Approach 1:
The source line is segmented into multiple independent sections, each serving a specific display region. By controlling which segments are active during scanning, the system achieves parallel processing while ensuring that pixels near division boundaries receive proper signals and maintain uniform brightness characteristics.
Solution Approach 2:
Instead of having a continuous source line that causes unevenness at division points, the invention inverts the approach by creating discrete segments with controlled connections. The segments that would normally cause problems at boundary points are actually designed to be non-connected or selectively connected, turning the potential harm into a benefit for uniformity.
Data Source
AI summary
Provided is a liquid crystal display device in which a source line is divided in a screen and the screen is driven in a horizontally divided state. A divided position (40) between a source line (30u) in an upper display region and a source line (30d) in a lower display region is arranged at an intersecting part between a source line (30) and a gate line (32). A part of the source line (30), which overlaps with a gate line (32a) on which the divided position 40 is present, has a planar shape additionally including an expanded part (46) (protruding portion) having the same area as a removed part of the source line (30) at the divided position (40), as compared to a part of the source line (30), which overlaps with a gate line (32b) on which the divided position (40) is absent.