Mesh Sensor Electrode Design for Touch Display Light Transmission
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Solution Overview
Problem
In display devices with touch sensors, the high resistance of sensor electrodes can slow down detection speed, and when formed from metal materials, they can block light emission, reducing display performance.
Innovation Solution
A display device design featuring a touch sensor with a first sensor electrode formed in a mesh shape using a low-resistance metal material that overlaps and surrounds pixels without blocking light, and a second sensor electrode made of a transparent conductive material that overlaps a third pixel, allowing for improved detection speed and light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If sensor electrodes are formed using metal materials to reduce resistance, then detection speed is improved, but light emission is blocked and display performance deteriorates
Solution Approach 1:
The sensor electrode is divided into multiple segments arranged in a mesh pattern, where only portions of the electrode overlap with pixel regions. This segmentation allows the electrode to maintain low resistance through continuous conductive paths while reducing light blocking by limiting metal coverage over light-emitting areas.
Solution Approach 2:
The sensor electrode has different properties in different regions: in pixel regions, it is positioned to minimize light obstruction while maintaining electrical connectivity; in non-pixel regions, it can have higher coverage to ensure low resistance. This local differentiation resolves the contradiction between detection speed and light emission.
2Speed
If sensor electrodes are formed with continuous coverage to reduce resistance, then detection speed improves, but the complexity of the electrode structure increases
Solution Approach 1:
The electrode is segmented into a mesh pattern that can be formed using standard photolithography processes. This segmentation approach maintains electrical continuity for low resistance while following regular geometric patterns that simplify manufacturing compared to arbitrary complex structures.
Data Source
AI summary
A display device comprising: a display region including a first pixel and a second pixel arranged apart from each other, and a third pixel, and a touch sensor includes a first sensor electrode and a second sensor electrode, wherein the touch sensor overlaps the display region, the first sensor electrode has an opening part in a region overlapping the first pixel and the second pixel, and surrounding the first pixel and the second pixel, and the second sensor electrode overlapping the third pixel.