Dual-Gate Array Substrate Wiring to Alleviate Toothed Edge
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Solution Overview
Problem
Dual-gate array substrate structures in TFT LCDs often exhibit a 'toothed edge' display issue due to staggered TFT elements, which can be mitigated but results in a lower aperture ratio when using a Black Matrix to shield protruding light-transmitting areas.
Innovation Solution
The design involves a specific wiring configuration where first and second gate lines are disposed on the same side of pixel elements, with metal patterns and jumper wires at different conductive layers, connected through via holes to alleviate the staggered configuration and prevent overlap, thereby maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a Black Matrix is used to shield protruding light-transmitting areas in dual-gate array substrate structure, then the toothed edge appearance is mitigated, but the aperture ratio is reduced
Solution Approach 1:
The patent extracts the shielding function from the Black Matrix and relocates it to the array substrate side through specifically designed common electrode regions. These regions extend into the light-transmitting areas to shield protruding portions, thereby eliminating the toothed edge appearance without requiring a Black Matrix on the color filter substrate side, thus preserving the aperture ratio
Solution Approach 2:
The patent utilizes the vertical dimension by extending common electrode regions from the array substrate side into the light-transmitting areas. This three-dimensional arrangement allows the shielding function to be achieved without occupying lateral space that would reduce the aperture ratio, effectively resolving the contradiction between display uniformity and aperture ratio
2Ease of manufacture
If dual-gate array substrate structure is used to reduce data lines, then manufacturing cost is reduced, but toothed edge appearance occurs during display
Solution Approach 1:
The patent introduces common electrode regions as an intermediary element between the gate lines and the light-transmitting areas. These regions serve as mediators that shield the protruding portions caused by the dual-gate structure, thereby eliminating the toothed edge appearance while preserving the cost benefits of the dual-gate configuration
Data Source
AI summary
The present disclosure discloses an array substrate and a display device so as to alleviate the toothed edge appearance when an image is displayed in a dual-gate array substrate structure. The array substrate includes at least one row of pixel elements, a first gate line, and a second gate line. The first gate line and the second gate line are disposed on the same side of the least one row of pixel elements. Thin film transistors are disposed in the pixel elements, and gates of the thin film transistors in two adjacent pixel elements are coupled with the first gate line and the second gate line, respectively.