Liquid Crystal Display Wiring Insulation at Small Pixel Pitches
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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 through holes in organic passivation and capacitance insulating films to maintain insulation and connection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel pitch is reduced to achieve high-definition display, then the display resolution is improved, but the insulation characteristics between wirings deteriorate
Solution Approach 1:
The patent introduces a multi-layer insulating film structure (first interlayer insulating film, second interlayer insulating film, organic passivation film, and capacitance insulating film) to provide insulation in vertical dimensions. This multi-dimensional insulation approach allows the horizontal pixel pitch to be reduced while maintaining reliable insulation between adjacent wirings through the stacked insulating layers.
Solution Approach 2:
The patent introduces a relay electrode as an intermediary element between the source electrode and the pixel electrode. This relay electrode is connected through a via hole and allows the source electrode to extend into the pixel electrode formation region, enabling better insulation control while maintaining electrical connectivity. The relay electrode acts as a mediator that resolves the conflict between reduced wiring spacing and maintained insulation characteristics.
2Measurement precision
If the wiring width is reduced to achieve smaller pixel pitch, then the display density is improved, but the wiring resistance increases
Solution Approach 1:
The patent employs a composite conductor structure where the source electrode is formed as a multi-layer composite structure including a lower source electrode and an upper source electrode. This composite structure increases the effective cross-sectional area of the wiring without increasing the horizontal width, thereby reducing wiring resistance while maintaining small pixel pitch. The composite material approach allows thickness compensation for width reduction.
3Measurement precision
If the spacing between wirings is reduced to achieve high-definition display, then the pixel density is improved, but the insulation characteristics between wirings deteriorate
Solution Approach 1:
The patent compensates for reduced horizontal wiring spacing by introducing multiple insulating layers in the vertical dimension. The first interlayer insulating film, second interlayer insulating film, organic passivation film, and capacitance insulating film are stacked to provide sufficient insulation distance between adjacent wirings, allowing high pixel density while maintaining insulation characteristics through vertical layering.
Solution Approach 2:
The relay electrode serves as an intermediary structure that facilitates proper insulation between the source electrode and pixel electrode. By introducing this intermediate element connected through a via hole, the patent enables the source electrode to extend into the pixel electrode formation region while maintaining appropriate spacing and insulation, thus resolving the conflict between reduced wiring spacing and maintained insulation.
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.