Under-Display Electrode Layout for Optical Window Touch Shielding
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Solution Overview
Problem
Reducing the bezel size of display devices to increase the screen-to-body ratio poses challenges in accommodating optical devices without interfering with the screen, and signal lines affecting touch sensor sensitivity.
Innovation Solution
The display device incorporates a common electrode with openings in the transmissive area and a mesh-form touch electrode, with electrical connections through the common electrode, to enhance transmittance and reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel size is reduced to increase screen-to-body ratio, then the screen area increases, but the space for disposing optical devices decreases
Solution Approach 1:
The patent moves the optical device from the traditional bezel region (2D plane) to the screen area by utilizing the Z-dimension (depth layer) through transparent or translucent display regions. This allows the optical device to be positioned behind the display panel while still being accessible and functional, effectively adding a third dimension to the spatial arrangement.
Solution Approach 2:
The patent introduces transparent or translucent display regions as intermediaries between the screen and the optical device. These regions allow light to pass through while enabling the optical device to function, serving as a mediator that reconciles the conflict between screen continuity and optical device placement.
2Illumination intensity
If layers are partially removed to increase transmittance, then light transmission improves, but signal lines affect touch sensor sensitivity
Solution Approach 1:
The patent extracts or removes specific layers (such as the common electrode layer) from regions where they would interfere with optical device functionality, creating transparent or translucent display regions. This selective removal improves light transmittance while maintaining touch sensor performance in other areas.
Solution Approach 2:
The patent applies different structural qualities to different regions of the display panel. The common electrode is removed or made transparent in specific regions to allow optical device operation, while remaining intact in other regions to maintain touch sensor sensitivity and display functionality. This localized differentiation resolves the contradiction between transmittance and sensitivity.
Data Source
AI summary
A display device includes a first display area including a first pixel area; a second display area including a second pixel area and a transmissive area; a signal line, a common electrode, and a touch electrode that are disposed in the second display area. The common electrode includes an opening overlapping the transmissive area, and the common electrode is disposed between the signal line and the touch electrode to overlap the signal line.