Array Substrate Wire Positioning for 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 black matrix coverage 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 positioned 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 a large black matrix coverage is used to prevent light leakage between wires and data lines, then light leakage prevention is improved, but the aperture ratio of pixel units deteriorates
Solution Approach 1:
The patent extracts the wire structure from the traditional data line configuration by positioning wires in the middle of sub-pixel units rather than running them along the edges. This repositioning removes the need for extensive black matrix coverage around wire-perimeter intersections, thereby extracting the harmful light leakage problem from the aperture ratio calculation and resolving the contradiction between light leakage prevention and aperture ratio maintenance
Solution Approach 2:
The patent transitions from a two-dimensional layout where wires run along data line edges to a three-dimensional arrangement where wires are positioned vertically in the middle of sub-pixel units. This dimensional change allows wires to be isolated from data lines in the lateral dimension, eliminating light leakage concerns at wire-data line intersections while preserving aperture ratio
2Ease of manufacture
If wires are positioned along data lines in traditional layout, then routing simplicity is improved, but aperture ratio deteriorates due to increased black matrix coverage
Solution Approach 1:
The patent segments the wire routing into individual wire segments, each positioned in the middle of a specific sub-pixel unit. This segmentation approach simplifies routing by eliminating the need for complex wire-data line intersection management, while simultaneously improving aperture ratio by reducing black matrix coverage requirements at critical intersection points
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.