Under-Display Camera Electrode Layout for Low-Visibility Crack Detection
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Solution Overview
Problem
Display devices face challenges in minimizing the external visibility of crack detecting electrodes and touch connection electrodes, particularly in areas where sensors are disposed, leading to difficulties in arranging touch electrodes and wiring lines.
Innovation Solution
The display device incorporates a substrate with a camera area surrounded by a display area and non-display area, featuring touch electrodes and crack detecting electrodes with specific patterns, including a first crack detecting electrode surrounding the camera area and a second crack detecting electrode with a zigzag pattern, to improve external visibility and minimize visibility of these electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If crack detecting electrodes and touch connection electrodes are disposed in the display area, then touch sensing function is enabled, but external visibility of these electrodes increases causing aesthetic degradation
Solution Approach 1:
The patent applies local quality by making the crack detecting electrode have different properties in different regions: in the first region (peripheral area), it has first properties (extended shape following the hole contour), while in the second region (central area), it has second properties (different configuration). This allows the electrode to be less visible in critical display areas while maintaining functionality.
Solution Approach 2:
The patent reduces the visibility of electrodes by transitioning them to different layers. The touch connection electrode is disposed on a different layer than the display elements, and the crack detecting electrode is configured to be less visible from the front view by utilizing vertical layering in the display structure.
2Adaptability or versatility
If a hole for sensor disposal is located in the display area, then sensor function is enabled, but arrangement of touch electrodes and wiring lines becomes difficult
Solution Approach 1:
The patent segments the display area into distinct regions: a first region where the hole is located and a second region surrounding it. The crack detecting electrode is divided into different portions with different configurations in these regions, allowing independent optimization for sensor functionality and electrode layout simplicity.
Solution Approach 2:
The crack detecting electrode serves multiple functions: it detects cracks in the display panel and simultaneously acts as a touch sensing element. By making the crack detecting electrode extend along the peripheral area and have specific configurations, it fulfills both crack detection and touch sensing roles without requiring separate dedicated touch electrodes in all areas.
Data Source
AI summary
A display device includes a plurality of touch electrode disposed in the display area; a touch connection electrode which connects two adjacent touch electrodes which are spaced apart from each other, among the plurality of touch electrodes; and a crack detecting electrode which surrounds the camera area and is disposed on the same layer as the plurality of touch electrodes, the plurality of touch electrodes include a plurality of first touch electrodes extending in a first direction and a plurality of second touch electrodes extending in a second direction intersecting the first direction, wherein the crack detecting electrode includes a first crack detecting electrode which surrounds the camera area and a second crack detecting electrode which is disposed in the display area and extends in the second direction, and the second crack detecting electrode has a zigzag pattern.