Array Substrate Wire Layout for Higher Pixel Aperture Ratio
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Solution Overview
Problem
Self-capacitance touch panels face a challenge in maintaining a high aperture ratio for pixel units due to the need for a large coverage by the black matrix to prevent light leakage between wires and data lines.
Innovation Solution
The array substrate design includes a base substrate with gate lines, data lines, a common electrode layer, and pixel units arranged in an array. The common electrode layer features common electrode blocks connected to wires through vias, with the wires located in the middle of sub-pixel units, reducing the need for black matrix coverage over wires and increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix coverage is increased to prevent light leakage between wires and data lines, then light leakage prevention is improved, but the aperture ratio of pixel units decreases
Solution Approach 1:
The patent relocates wires from the pixel region to the non-pixel region (between pixel units), changing their spatial dimension and arrangement. This dimensional repositioning allows wires to be positioned where they do not interfere with the optical path of pixel units, eliminating the need for extensive black matrix coverage while maintaining light leakage prevention.
Solution Approach 2:
The patent segments the substrate into distinct pixel regions and non-pixel regions, with wires specifically positioned in the non-pixel regions. This segmentation separates the electrical connection function (wires) from the optical display function (pixel units), allowing each to be optimized independently without compromising the other.
2Reliability
If wires are positioned to connect common electrode blocks, then electrical connectivity is improved, but the aperture ratio decreases due to black matrix coverage requirements
Solution Approach 1:
The patent repositions wires from the vertical dimension (through pixel units) to the horizontal dimension (in non-pixel regions between pixel units). This spatial reconfiguration maintains electrical connectivity between common electrode blocks while removing wires from the optical path, thereby increasing aperture ratio without compromising connectivity.
Solution Approach 2:
The non-pixel regions serve as intermediary spaces that accommodate wires and connection structures. These intermediary zones act as buffer areas where electrical connections can be established without interfering with the pixel units, effectively mediating between the conflicting requirements of connectivity and aperture ratio.
Data Source
AI summary
An array substrate is provided. The array substrate includes a base substrate and a plurality of gate lines, a plurality of data lines, a common electrode layer and a plurality of pixel units arranged in an array disposed on the base substrate. Each of the pixel units includes a plurality of sub-pixel units defined by gate lines and data lines disposed to intersect each other laterally and vertically. The common electrode layer includes a plurality of common electrode blocks that double as self-capacitance electrodes, each of the common electrode blocks is connected with at least one wire, and the wires are in the middle of sub-pixel units of a same column.