Non-Rectangular LCD Selector Layout for Narrow Frame Routing
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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 scanning lines and drain lines are arranged in specific directions, and a selector is placed between the display region and the driver, with video signal lines and drain lines disposed accordingly to reduce the number of routing lines and prevent interference, while the selector control signal line is formed on the same layer as the drain lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of drain lines is increased to achieve high resolution, then the display resolution is improved, but the frame region area is enlarged
Solution Approach 1:
The display region is divided into multiple segments, each served by a separate scanning line group. Multiple drain lines are bundled and routed through shared routing paths, allowing high resolution without proportionally increasing the frame region area.
Solution Approach 2:
Drain lines are routed in multiple layers and dimensions within the frame region. The routing structure utilizes vertical and horizontal dimensions efficiently, with lines passing through different depth levels to minimize surface area occupation.
2Device complexity
If selector circuits are added to reduce the number of video signal lines, then the number of routing lines is reduced, but interference between selector circuits and scanning lines occurs
Solution Approach 1:
Selector circuits are extracted and positioned in the frame region away from the active display area. This spatial separation removes the interference problem between selector circuits and scanning lines while still achieving line reduction through the selector functionality.
Solution Approach 2:
Shielding structures are introduced as intermediary elements between selector circuits and scanning lines. These shields act as mediators that block electromagnetic interference while allowing the selector circuits to maintain their line-reduction function.
3Area of stationary object
If the frame region is reduced to meet design requirements, then the overall device size is reduced, but the layout of peripheral circuits and wirings becomes more difficult
Solution Approach 1:
The wiring layout employs dynamic routing strategies where line widths and routing paths are adjusted based on local density requirements. Critical signal lines receive wider traces and dedicated routing corridors, while less critical lines share congested areas, enabling compact frame region design.
Solution Approach 2:
Different regions of the frame area are assigned different functional qualities. Areas near the display region are optimized for high-speed signal routing with shielding, while distant areas accommodate lower-priority connections. This localized optimization enables reduced frame size while maintaining manufacturability.
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.