Touch Electrode Layout for Under-Panel Camera Transmission
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Solution Overview
Problem
In touch display devices based on camera under panel (CUP) technology, ensuring normal touch and display functions while increasing transmission percentage in additional function areas is a technical challenge due to the disposition of display units and touch layers, which affects the screen-to-body ratio and full-screen design aspirations.
Innovation Solution
A touch display device with a touch layer featuring a specific arrangement of touch electrodes, including grid-shaped touch sensing parts and connecting parts that create light transmissive areas without pixel units, increasing the distance and width of these areas to enhance transmission percentage and capacitance, thereby ensuring normal touch and display functions across the entire panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional touch electrode arrangements are used in CUP areas, then touch functions can be maintained, but transmission percentage is reduced due to dummy electrode patterns
Solution Approach 1:
The touch electrode in the CUP area is segmented into multiple independent sensing segments arranged in a specific pattern, allowing light to pass through the gaps between segments while maintaining touch sensitivity. This segmentation eliminates the need for continuous dummy electrode patterns that block light.
Solution Approach 2:
The touch electrode structure is optimized locally in the CUP area with different properties than in normal display areas. The electrode uses a sparse grid pattern with larger spacing and reduced material coverage specifically in the CUP region, allowing high light transmission while maintaining sufficient touch detection capability through localized sensing segments.
2Manufacturing precision
If display units are densely arranged to maintain display quality, then display resolution is improved, but transmission percentage in CUP areas deteriorates
Solution Approach 1:
The display units in CUP areas are selectively removed or segmented to create light transmissive regions, while the touch electrode is correspondingly segmented to maintain touch functionality. This segmentation allows light to pass through while preserving essential display and touch capabilities.
Solution Approach 2:
The solution moves from a two-dimensional dense grid of display units to a three-dimensional arrangement where light can pass through the structure from the front, with touch sensing capability maintained through the spatial distribution of electrode segments across multiple layers or depths.
3Reliability
If CUP areas use conventional touch electrode designs, then touch sensitivity is maintained, but light transmission is blocked by continuous electrode patterns
Solution Approach 1:
The touch electrode in CUP areas adopts a porous or grid-like structure with intentional openings and gaps, allowing light to pass through the electrode layer. The porous arrangement maintains electrical connectivity for touch sensing while creating light transmissive pathways.
Solution Approach 2:
Instead of making the electrode continuous and blocking light, the design inverts the approach by making the electrode sparse and open, allowing light transmission as the default state while using strategically placed sensing segments to detect touch input through the open structure.
Data Source
AI summary
A touch display device is provided. At least one touch electrode includes a first part corresponding to each of at least one additional function area and a second part corresponding to a normal display area. Length and width of at least one trace of a connecting part between each adjacent two of touch sensing parts in the first part are increased to reduce capacitance difference between the first part and the second part. Areas without any pixel unit in each of the at least one additional function area form light transmissive areas, respectively. Thus, a transmission percentage is increased. Touch and display functions of each of at least one additional function area are ensured to be normal, and the transmission percentage is increased at the same time.