Variant-Shape LCD Selector Layout for Narrow-Bezel High Resolution
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Solution Overview
Problem
Liquid crystal display devices with non-rectangular display regions face challenges in reducing the frame area due to increased drain routing lines, which can cause interference with scanning lines and common wiring, making it difficult to achieve high resolution and minimize the frame region.
Innovation Solution
The implementation of a selector circuit with a TFT substrate and counter substrate configuration, where the number of drain lines is reduced by using a selector between the driver and the display region, and the selector control signal line is formed on the same layer as the drain lines to minimize interference and frame area, allowing for efficient video signal distribution and reduced frame size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of drain lines is increased to achieve high resolution in variant-shape display panels, then the display resolution is improved, but the frame area is enlarged due to increased drain routing lines
Solution Approach 1:
The display panel is divided into multiple display regions (first display region and second display region) with different pixel arrangements. The first display region uses a conventional rectangular pixel arrangement, while the second display region uses a triangular pixel arrangement. This segmentation allows each region to be optimized independently, reducing the overall frame area while maintaining high resolution across the entire variant-shape display panel.
2Area of stationary object
If the frame region is reduced to meet modern display requirements, then the frame area is minimized, but the number of drain routing lines must be reduced which complicates the wiring layout
Solution Approach 1:
Different pixel arrangements are applied to different regions of the display panel. The first display region uses a rectangular pixel arrangement suitable for conventional wiring, while the second display region uses a triangular pixel arrangement that optimizes the wiring layout for that specific region. This local optimization allows the frame area to be reduced while managing wiring complexity through region-specific designs.
3Device complexity
If a selector circuit is introduced to reduce the number of video signal lines, then the number of routing lines is reduced, but interference occurs between the selector circuit and scanning lines or common wiring
Solution Approach 1:
The pixel arrangement in the second display region is changed from a conventional two-dimensional rectangular grid to a triangular arrangement. This dimensional change in the pixel layout allows for optimized wiring paths that reduce interference between selector circuits, scanning lines, and common wiring, while still achieving the goal of reducing the number of routing lines through the use of selector circuits.
Data Source
AI summary
A liquid crystal display device having an outer shape of a display region formed other than a rectangle. A driver for supplying a video signal is disposed outside the display region. A selector with selector TFT is disposed between the display region and the driver. A video signal line is disposed between the driver and the selector, and a drain line is disposed between the selector and the display region. A scanning circuit for supplying a scanning signal to the scanning line is disposed outside the display region. The selector is disposed between the scanning line and the display region, and covered with ITO as the common electrode. The common bus wiring is disposed outside the selector.