Transparent Display Touch Electrode Layout With Variable Encapsulation
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Solution Overview
Problem
Current transparent touch display devices face challenges with materials like ITO and silver nanowires due to their electrical or 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 these 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 (ITO) to enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ITO or silver nanowires are used as touch electrodes, then transparency is maintained, but electrical or physical properties are insufficient
Solution Approach 1:
The patent uses a composite structure combining transparent substrate, conductive layer (ITO or silver nanowires), and encapsulation layer with different thicknesses. This composite approach maintains transparency while improving electrical properties and physical durability through the combined functionality of multiple materials.
Solution Approach 2:
The encapsulation layer is designed with different thicknesses in different regions: thicker in the circuit area for protection and thinner in the transparent area for maintaining transparency. This local variation optimizes both electrical properties and optical properties in their respective zones.
2Ease of manufacture
If the encapsulation layer has uniform thickness, then manufacturing is simplified, but performance in different areas (circuit vs transparent) is compromised
Solution Approach 1:
The encapsulation layer thickness is locally optimized: a first thickness in the circuit area providing enhanced protection and electrical performance, and a second (different) thickness in the transparent area maintaining optical properties. This regional differentiation improves overall device performance while remaining manufacturable.
Solution Approach 2:
The encapsulation layer is segmented into at least two distinct thickness regions corresponding to different functional areas (circuit area and transparent area). This segmentation allows each region to be optimized for its specific function while being fabricated as an integrated structure.
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.