In-Cell Array Substrate Layout for Touch Sensitivity and Transmittance
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Solution Overview
Problem
In-Cell touch technology faces challenges in maintaining display quality while integrating touch sensors into pixel cells, as existing designs often compromise transmittance and screen thickness, limiting their application scope.
Innovation Solution
The array substrate incorporates touch electrode wires and data wires on the same layer as the source and drain of the thin film transistor, with touch electrode wires abreast of data wires, allowing for efficient signal transmission and reuse of common electrodes as touch sensors, reducing impedance and maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrode wires are added to the display screen, then touch sensitivity is improved, but display quality deteriorates
Solution Approach 1:
The patent merges the touch electrode wires with the data wires by disposing them on the same layer where source and drain are located. The touch electrode wires are positioned abreast on the two sides of each data wire, allowing both display data transmission and touch signal detection to occur simultaneously without interfering with each other, thus improving touch sensitivity while maintaining display quality
Solution Approach 2:
The common electrodes of pixel cells are reused as touch sensors, giving them dual functionality. These electrodes serve both as display components for showing images and as sensing elements for detecting touch input, thereby reducing the need for additional dedicated touch sensor structures and maintaining display quality while enabling touch functionality
2Length of moving object
If touch sensors are integrated into pixel cells, then screen thickness is reduced, but transmittance deteriorates
Solution Approach 1:
The patent resolves the transmittance-thickness contradiction by changing the dimensional arrangement of touch electrode wires. Instead of adding wires in the vertical dimension (which would increase thickness and block light), the wires are disposed on the same layer as source and drain, abreast on both sides of data wires. This lateral arrangement allows the touch sensors to be integrated without adding vertical thickness or blocking light paths, thus maintaining both thinness and high transmittance
3Device complexity
If touch electrode wires are disposed on the same layer as source and drain, then manufacturing complexity is reduced, but signal interference increases
Solution Approach 1:
The patent segments the touch electrode wires into multiple separate wires disposed on both sides of each data wire. This segmentation allows each touch electrode wire to be independently positioned and connected to corresponding touch sensors, reducing the likelihood of signal interference while maintaining the benefit of reduced manufacturing complexity from using the same layer as source and drain
Data Source
AI summary
The present disclosure discloses an array substrate and a display device. The array substrate includes a touch substrate, the touch substrate includes a plurality of touch electrodes and a plurality of touch electrode wires disposed in an array, each touch electrode includes a plurality of touch sensors disposed in an array, common electrodes of all pixel cells of the array substrate are reused as the touch sensors, and the array substrate includes data wires for providing display data to the pixel cells; the array substrate includes a base substrate and a thin film transistor which are stacked, the touch electrode wires and the data wires are provided on the same layer where a source and a drain of the thin film transistor are located, and the touch electrode wires are abreast provided on the two sides of each data wire.