Touch Display Connection Bridge Shadow Dispelling
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Solution Overview
Problem
On-cell mode touch panels with opaque metal connection bridges in capacitive touch display devices suffer from shadow dispelling issues, affecting touch precision and display quality due to the visibility of these bridges on the image.
Innovation Solution
The touch display device incorporates a design where connection bridges between sensor units are positioned in non-functional regions between pixel units, extending in directions that minimize their impact on the displayed image, using zigzag-shaped or linear connection bridges made from metal materials, and arranged in a manner that reduces their visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If opaque metal connection bridges are used to electrically connect sensor units, then electrical conductivity and touch precision are improved, but visibility of the connection bridges on the displayed image increases causing shadow dispelling issues
Solution Approach 1:
The connection bridges are extracted from the functional regions and relocated to non-functional regions (black matrix areas) between pixel units. This separation removes the harmful visual impact of the opaque metal bridges from the display area while preserving their essential electrical connection function between sensor units.
Solution Approach 2:
The connection bridges are oriented to extend along the row or column directions, utilizing the non-functional regions in these dimensions. By changing the spatial arrangement and orientation of the connection bridges to align with the non-functional region structure, the solution achieves both electrical connectivity and visual invisibility.
2Reliability
If connection bridges are positioned in functional regions to ensure electrical connectivity, then touch panel functionality is maintained, but display quality deteriorates due to visible shadows on the image
Solution Approach 1:
The connection bridges are extracted from the functional display regions and relocated to non-functional regions. This extraction maintains electrical connectivity for touch panel functionality while removing the harmful visual shadows from the display area, thus preserving display quality.
Solution Approach 2:
The non-functional regions (black matrix areas) serve as intermediary spaces that accommodate the connection bridges. These intermediary regions provide both electrical connectivity pathways and visual shielding, allowing the connection bridges to function without degrading display quality.
3Reliability
If connection bridges extend in various directions to connect sensor units, then electrical connectivity is ensured, but visibility and shadow impact increase
Solution Approach 1:
The connection bridges are designed with asymmetric orientation, extending preferentially along the row or column directions rather than in random or diagonal directions. This asymmetric arrangement aligns with the non-functional region structure and minimizes visual impact while maintaining electrical connectivity.
Solution Approach 2:
The connection bridges are constrained to extend along specific dimensional directions (row or column directions) that correspond to non-functional regions. By utilizing these specific dimensions, the solution achieves both connectivity and minimization of visual shadow effects.
Data Source
AI summary
A touch display device is provided. The touch display device comprises a display panel (5), the display panel (5) has a plurality of pixel units (3), each of the pixel units (3) includes a functional region (31), and a non-functional region (32) is formed between functional regions (31) of adjacent pixel units. The touch display device further comprises a plurality of lines of sensor units (1), and adjacent sensor units in each line of the sensor units are electrically connected with each other by a connection unit. The connection unit includes a connection bridge (21, 22), a projection of at least part of the connection bridge (21, 22) on a light emission surface of the display panel (5) is located in the non-functional region (32) between the functional regions (31) of adjacent pixel units and extends in an extension direction of the non-functional region (32). A shadow dispelling effect of the connection bridge is improved, and display quality of the touch display device is improved.