Discontinuous Selection Lines for Pixel Array Substrates
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Solution Overview
Problem
Conventional pixel array designs with continuous selection lines often cause mura issues in display devices, degrading display performance due to the extension of selection lines across intersections, which complicates wire routing and inspection processes.
Innovation Solution
A pixel array substrate with discontinuous selection lines, where each selection line has a first portion overlapped with a signal line at an intersection and a second portion separated by a gap, with metal lines overlapping these gaps to maintain consistent routing structures and avoid mura, while being electrically insulated to prevent signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If continuous selection lines are used to connect signal lines at intersections, then wire routing flexibility is improved, but mura issues occur that degrade display performance
Solution Approach 1:
The selection line is divided into multiple segments with gaps between them. Each segment is independently controlled, allowing the line to be disconnected at specific intervals. This segmentation eliminates the continuous path that causes mura while preserving the ability to route signals to different intersections by selectively activating segments.
Solution Approach 2:
The problematic continuous portion of the selection line is extracted and removed, creating gaps at regular intervals. This extraction eliminates the source of mura interference while the remaining segments maintain the essential signal routing function through selective activation.
2Adaptability or versatility
If selection lines extend across multiple intersections, then signal routing options increase, but inspection complexity increases
Solution Approach 1:
By segmenting the selection line into discrete sections separated by gaps, each segment becomes an independent inspection unit. This reduces inspection complexity as each segment can be individually verified, while the combination of segments still provides multiple routing options through selective activation.
Solution Approach 2:
The gaps act as intermediaries between line segments, providing clear demarcation points for inspection. These gaps serve as reference markers that simplify automated optical inspection by providing distinct boundaries between functional segments, reducing inspection complexity.
3Reliability
If discontinuous selection lines with gaps are used, then mura issues are prevented, but routing structure consistency becomes challenging
Solution Approach 1:
Different segments of the selection line are designed with locally optimized characteristics. The gaps are positioned and sized differently in various locations to maintain visual consistency while preventing mura. Each local segment is tailored to its specific position in the pixel array, ensuring overall structure consistency despite the discontinuous nature.
Solution Approach 2:
The parameters of the gaps (size, position, orientation) are systematically varied to maintain routing structure consistency across the display. By carefully controlling these parameters, the discontinuous line segments appear consistent as a whole while effectively preventing mura through their discontinuous nature.
Data Source
AI summary
A pixel array substrate includes a substrate, first signal lines, second signal lines, active elements, pixel electrodes, selection lines, a driving unit, and metal lines. Each selection line is intersected with the first signal lines to form a first intersection and second intersections. Each selection line is electrically connected to the first signal line at the first intersection and electrically insulated to the first signal lines at the second intersections. Each selection line has a first portion and a second portion. The first portion is overlapped with the first signal line at the first intersection and separated from the second portion by a gap. The driving unit is electrically connected to the second signal lines and the first portions of the selection lines. Each metal line is overlapped with one of the gaps.