LCD Pixel Electrode Relay Structure for Small-Pitch Insulation
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Solution Overview
Problem
High-definition liquid crystal displays face challenges in maintaining insulation characteristics and image quality with small pixel pitches, particularly in virtual reality displays, due to reduced wiring width and spacing.
Innovation Solution
The solution involves a liquid crystal display device with a thin-film transistor configuration that includes a semiconductor film connected to a source electrode through a relay electrode, using interlayer insulating films and organic passivation films to maintain insulation and connection stability, with through holes in these films allowing connections between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel pitch is reduced to achieve high-definition display, then the image quality is improved, but the insulation characteristics between wirings deteriorate
Solution Approach 1:
The patent introduces a multi-layer structure with first and second interlayer insulating films stacked in the vertical dimension to provide insulation between wirings. This vertical layering approach allows maintaining insulation characteristics while reducing horizontal pixel pitch for high-definition display.
Solution Approach 2:
The patent uses interlayer insulating films as intermediary elements between adjacent video signal lines and between the source electrode and video signal lines. These insulating films act as mediators that prevent electrical interference while allowing the wirings to be positioned closely for small pixel pitch.
2Measurement precision
If the wiring width is reduced to achieve small pixel pitch, then the pixel density is improved, but the wiring resistance increases
Solution Approach 1:
The patent employs a composite wiring structure where the source electrode is formed with a stack of first and second interlayer insulating films, creating a multi-material composite that maintains electrical conductivity while reducing the horizontal wiring width for higher pixel density.
Solution Approach 2:
The patent compensates for reduced wiring width by increasing wiring thickness in the vertical dimension. The multi-layer insulating film structure allows the source electrode to extend vertically, maintaining adequate cross-sectional area for current flow while keeping the horizontal footprint small for high pixel density.
3Area of stationary object
If the spacing between wirings is reduced to achieve small pixel pitch, then the device area is reduced, but the insulation characteristics deteriorate
Solution Approach 1:
The patent resolves the spacing contradiction by moving insulation from the horizontal plane to the vertical dimension. Multiple interlayer insulating films are stacked vertically between closely-spaced wirings, enabling small horizontal spacing while maintaining adequate insulation through the vertical layering approach.
Solution Approach 2:
The patent implements a nested structure where the source electrode is positioned between video signal lines, with interlayer insulating films nested between these electrodes. This nested arrangement allows maximum space utilization and minimal spacing while maintaining insulation through the layered configuration.
Data Source
AI summary
The purpose of the invention is to improve the reliability of insulation between the video signal line and the source electrode in a liquid crystal display device. The configuration is: A liquid crystal display device in which a first video signal line, a second video signal line and a source electrode are on a first interlayer insulating film; a second interlayer insulating film is formed over the first video signal line, the second video signal line, and the source electrode; a relay electrode connected to the source electrode is formed on the second interlayer insulating film, an organic passivation film is formed over the second interlayer insulating film, a capacitance insulating film is formed over the organic passivation film, and the pixel electrode is formed in a first through hole formed in the organic passivation film; the pixel electrode is connected to the relay electrode in the first through hole.