Display Device Bezel Reduction via Touch Line Bending
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Solution Overview
Problem
Integrated display devices with self-capacitance touchscreens face challenges in minimizing bezel area due to insufficient space for display link lines and touch lines, leading to electrical short circuits between signal pads.
Innovation Solution
A display device design with touch electrodes on a light-emitting element, display link lines and touch lines in a non-active area, and a touch passivation film contacting the touch lines in a bending area, reducing the bezel area while preventing electrical short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch lines and display link lines are disposed in the bezel area, then the touchscreen can be driven, but the bezel area width cannot be reduced
Solution Approach 1:
The patent extends touch lines from the active area directly into the bending area, utilizing the third dimension (depth/layering) and curved space to route lines, thereby reducing the horizontal bezel width while maintaining electrical connectivity for touchscreen operation
2Reliability
If the number of touch lines is increased for self-capacitance touchscreen, then touch sensitivity is improved, but the space for signal transmission is insufficient
Solution Approach 1:
The patent utilizes the bending area as an additional spatial dimension to route multiple touch lines, allowing increased line density for self-capacitance touchscreen operation without compromising signal transmission space in the traditional bezel area
3Area of stationary object
If signal pads are placed closer together, then the signal transmission film length is reduced, but electrical short circuit occurs between signal pads
Solution Approach 1:
The patent introduces a bending area as an intermediary space between signal pads, using the curved geometry and increased spatial separation in this intermediate region to prevent electrical short circuits while allowing shorter overall signal transmission film length
Data Source
AI summary
Disclosed is a display device having a reduced bezel area. The display device includes a plurality of touch electrodes disposed on a light-emitting element, display link lines and touch lines disposed in a non-active area, and a touch passivation film disposed on the touch electrodes, the touch passivation film contacting the touch lines disposed in a bending area of the non-active area. Consequently, a narrow bezel may be realized.