Color Filter Substrate Touch Routing via Black Matrix
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Solution Overview
Problem
In touch and display driver integration display products, touch routing lines often traverse blue pixel regions on TFT substrates, leading to non-uniform display brightness due to light shielding, which degrades display quality.
Innovation Solution
A color filter substrate design featuring a base substrate with a black matrix, an insulation layer, and a touch routing line positioned between the black matrix and the insulation layer, where the touch routing line is electrically connected to a conductive contact pad through a via hole in the insulation layer, preventing light shielding and ensuring uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch routing lines traverse blue pixel regions on TFT substrates, then touch electrode connectivity is achieved, but display brightness uniformity deteriorates due to light shielding
Solution Approach 1:
The touch routing line is extracted from the blue pixel region and relocated to the black matrix region. This separation removes the light-shielding element from the light-transmission path, eliminating the brightness non-uniformity while preserving touch electrode connectivity through the black matrix area.
Solution Approach 2:
The routing path is changed from traversing the pixel region (horizontal/vertical plane) to utilizing the black matrix region (different spatial zone). This dimensional repositioning allows the routing line to connect touch electrodes without interfering with the optical path of the pixel regions.
2Ease of operation
If touch routing lines are placed in blue pixel regions, then electrode connectivity is maintained, but light transmission is blocked causing display quality degradation
Solution Approach 1:
The black matrix serves as an intermediary region that accommodates the touch routing line. This mediator area provides a pathway for electrical connectivity while being optically inactive (already blocking light), thus preventing additional light shielding harm to the display quality.
3Adaptability or versatility
If routing lines cross pixel regions for touch connection, then touch functionality is achieved, but pixel brightness consistency deteriorates
Solution Approach 1:
The substrate is segmented into functional zones: pixel regions for light transmission and the black matrix region for routing. This segmentation allows touch routing lines to be confined to non-pixel areas, preserving pixel brightness consistency while maintaining touch functionality through dedicated routing pathways.
Data Source
AI summary
A color filter substrate, a display panel and a display device are provided. The color filter substrate includes: a base substrate; a black matrix on a side of the base substrate; an insulation layer on a side of the black matrix away from the base substrate; and a touch routing line between the black matrix and the insulation layer, wherein an orthogonal projection of the black matrix on the base substrate covers an orthogonal projection of the touch routing line on the base substrate.