Transparent Touch Display Mesh Electrodes for Sensitivity and Clarity
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Solution Overview
Problem
Current transparent touch display devices using materials like indium tin oxide (ITO) or silver nanowires face limitations in electrical and physical properties, necessitating improved touch electrode designs.
Innovation Solution
A display device with a circuit area and transparent areas, featuring a mesh-shaped configuration of signal lines, pixel circuits, and light-emitting elements, where the thickness of the encapsulation layer varies between the circuit and transparent areas, and the touch electrodes are designed to overlap the circuit area without covering the light-emitting elements, using conductive materials like metals or indium tin oxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulation layer thickness is increased to improve protection and durability, then reliability is improved, but transparency and light transmission in the transparent areas deteriorate
Solution Approach 1:
The encapsulation layer is designed with different thicknesses in different regions: a first thickness in the circuit area and a second thickness in the transparent areas. This local differentiation allows the circuit area to have enhanced protection while the transparent areas maintain high light transmission, resolving the contradiction between reliability and transparency.
2Measurement precision
If touch electrodes are made with larger area to improve touch sensitivity, then touch sensitivity is improved, but transparency of the display device deteriorates
Solution Approach 1:
The touch electrodes are configured in a mesh shape that overlaps with the circuit area rather than covering the transparent areas. This segmentation approach divides the touch sensing function across multiple smaller electrode segments arranged in a grid pattern, allowing sufficient touch sensitivity while maintaining transparency in the critical display areas.
Solution Approach 2:
The touch electrodes are positioned in the circuit area dimension rather than extending into the transparent area dimension. By confining the electrode arrangement to the circuit area and using a mesh configuration, the design achieves adequate touch sensitivity through spatial distribution without compromising the transparency of the display device.
3Illumination intensity
If mesh-shaped configuration is used to maintain transparency, then transparency is improved, but touch sensitivity may deteriorate due to reduced electrode area
Solution Approach 1:
The mesh-shaped configuration segments the touch electrodes into multiple smaller elements arranged in a grid pattern within the circuit area. This segmentation maintains overall transparency by reducing continuous electrode coverage while the distributed mesh structure preserves touch sensitivity through multiple sensing points across the display surface.
Data Source
AI summary
A display device is provided. The display device includes a display unit having a circuit area and a plurality of transparent areas. The display unit includes a plurality of signal lines located in the circuit area, a plurality of pixel circuits electrically connected to the signal lines and located in the circuit area, a plurality of light-emitting elements driven by the pixel circuits and located in the circuit area, and an encapsulation layer located in the circuit area and the plurality of transparent areas. At least one of the plurality of transparent areas is enclosed by the circuit area. A first thickness of the encapsulation layer located in the circuit area is different from a second thickness of the encapsulation layer located in the at least one of the plurality of transparent areas.