LCD Pixel Structure Merging Data and Common Electrodes
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Solution Overview
Problem
Conventional liquid crystal display (LCD) pixel structures face complexity and reduced transparency due to the need for a thick insulating layer between different material layers, which increases process complexity and affects aperture ratio.
Innovation Solution
A simplified pixel structure for LCD panels is developed, using only three insulating layers, where the first patterned conductive layer serves as the data line, and the second patterned conductive layer as the scan line, with the common electrode formed on the substrate, eliminating the need for a third insulating layer and improving light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick insulating layer is used between the common electrode and data line to prevent short-circuiting, then electrical insulation is improved, but process complexity increases and transparency deteriorates
Solution Approach 1:
The patent merges the data line and common electrode into the same material layer, eliminating the need for a thick insulating layer between them. This integration allows both conductive elements to coexist in one layer with optimized routing, achieving electrical insulation through design rather than thickness, thus reducing process complexity while maintaining reliability
Solution Approach 2:
The patent transitions from a vertical stacking approach (requiring thick insulating layers between layers) to a planar routing approach where the data line and common electrode are arranged in the same layer. This dimensional change eliminates the need for vertical separation, reducing the number of insulating layers required while maintaining electrical insulation
2Reliability
If a thick insulating layer is used between the common electrode and data line, then electrical insulation is improved, but light transmission deteriorates
Solution Approach 1:
By merging the data line and common electrode into the same material layer, the patent eliminates the need for thick insulating layers that block light. The integrated design achieves electrical insulation through lateral routing and spacing within the same layer, preserving light transmission while maintaining reliability
Solution Approach 2:
The patent moves the insulation function from the vertical dimension (thick insulating layers between layers) to the horizontal dimension (spacing and routing within the same layer). This allows light to pass through without being blocked by thick insulating materials while still achieving electrical insulation through planar design
3Device complexity
If the third insulating layer is omitted to simplify the structure, then process complexity is reduced, but the distance between data line and common electrode must be large to avoid short-circuiting
Solution Approach 1:
The patent merges the data line and common electrode into the same material layer, allowing them to be positioned close together without short-circuiting risks. This integration enables compact pixel design with high aperture ratio while maintaining electrical insulation through optimized routing and spacing within the same layer
Solution Approach 2:
By transitioning to a planar routing approach within the same layer, the patent achieves electrical insulation through lateral spacing rather than vertical separation. This allows the data line and common electrode to be positioned close together, maximizing the aperture ratio while preventing short-circuits through design rather than distance
Data Source
AI summary
A pixel structure of a liquid crystal display panel and the method thereof is provided. The gate electrode and data line of the pixel structure are formed by a first patterned conductive layer, the scan line is formed by a second patterned conductive layer, and the common electrode and the pixel electrode are formed on a substrate. The common electrode, the pixel electrode, and the insulating layer disposed therebetween compose a storage capacitor. Also, the pixel or the common electrode has a slit structure.