Touch Sensor Mesh Routing via Upper Bezel Area
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Solution Overview
Problem
The increasing number of touch electrodes in display devices leads to an expansion of the bezel area, which is the non-display region occupied by touch lines, resulting in a larger size and thickness of the display panel.
Innovation Solution
The touch electrodes and touch lines are arranged in a mesh shape on an encapsulation layer, with some touch lines connected to the touch-driving circuit via the upper bezel area, reducing the size of the left and right bezel areas by minimizing the number of touch lines extending along these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch electrodes is increased to improve touch sensitivity and coverage, then the touch sensor performance is improved, but the bezel area size increases due to more touch lines required
Solution Approach 1:
The patent utilizes the upper bezel area (vertical dimension) to route touch lines, in addition to the traditional left and right bezel areas (horizontal dimension). This multi-dimensional routing approach allows touch lines to connect touch electrodes to the touch-driving circuit without concentrating all lines in the horizontal bezel areas, thereby reducing the required width of left and right bezel areas while accommodating a larger number of touch electrodes.
2Adaptability or versatility
If more touch lines are routed through the left and right bezel areas to connect increased touch electrodes, then the touch sensor functionality is enhanced, but the bezel area size and display panel thickness increase
Solution Approach 1:
The patent segments the routing paths of touch lines by directing different groups of touch lines through different bezel areas. Specifically, some touch lines are routed through the upper bezel area while others are routed through the left and right bezel areas. This segmentation distributes the routing burden across multiple spatial paths, reducing the density of touch lines in any single bezel area and thereby reducing the overall bezel area size and thickness required.
3Reliability
If touch lines are extended along the left and right bezel areas to connect touch electrodes, then the touch signal transmission is maintained, but the number of touch lines in these areas increases the bezel area size
Solution Approach 1:
The patent introduces the upper bezel area as an intermediary routing path for touch lines. Instead of extending all touch lines directly through the left and right bezel areas, the upper bezel area serves as a mediator that provides alternative routing paths. This intermediary path allows touch signals to be transmitted reliably while reducing the number of touch lines that must be accommodated in the left and right bezel areas, thereby reducing their size.
Data Source
AI summary
The present disclosure provides a display device having a touch sensor for reducing the size of a bezel area. The display device having a touch sensor is configured such that touch electrodes and touch lines are disposed in a mesh shape on an encapsulation layer encapsulating light-emitting elements and such that some of the touch lines are connected to a touch-driving circuit via an upper bezel area, thereby reducing the size of left and right bezel areas.