Color Filtering Substrate Touch Electrode Isolation
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Solution Overview
Problem
Conventional embedded touch screens experience mutual interference between touch electrical fields and display electrical fields due to the passage of touch electrical fields through the liquid crystal layer, which affects the operation and manufacturing costs of the touch screens.
Innovation Solution
A color filtering substrate is designed with first and second touch electrodes integrated into the black matrix and color filtering layers, respectively, to create a touch electrical field that is isolated from the liquid crystal layer, reducing interference and allowing the use of existing color filter structures as touch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch electrodes are arranged on separate substrates with the liquid crystal layer in between, then the touch screen structure is simplified, but the touch electrical field interferes with the display electrical field causing mutual effects
Solution Approach 1:
A high resistance film layer is introduced as an intermediary component between the touch electrodes and the liquid crystal layer. This mediator layer blocks the passage of the touch electrical field through the liquid crystal layer, preventing interference with the display electrical field while maintaining the simplified embedded touch screen structure
Solution Approach 2:
The color filtering substrate is segmented into multiple functional layers including a black matrix layer, a high resistance film layer, and a color filtering layer. The high resistance film layer is specifically positioned to serve as an electrical insulator while allowing the touch electrodes to be formed from portions of the black matrix and color filtering layers
2Object-affected harmful factors
If a high resistance film layer is added to block electrical field interference, then electrical field interference is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The high resistance film layer is merged with the color filtering substrate structure, and the touch electrodes are formed by utilizing portions of the existing black matrix layer and color filtering layer. This integration allows the high resistance film to perform its electrical insulation function without requiring separate manufacturing steps for the touch electrodes
Solution Approach 2:
The black matrix layer and color filtering layer serve dual functions: they provide their traditional color filtering and structural functions, and simultaneously form the touch electrodes. This multi-functionality reduces the need for additional layers and simplifies the overall manufacturing process
Data Source
AI summary
Embodiments of the present invention provide a color filtering substrate and a display apparatus. The color filtering substrate includes: a base substrate; and a black matrix layer and a color filtering layer arranged on the base substrate. The base substrate is further provided with a first touch electrode and a second touch electrode configured to form a touch electrical field. The color filtering substrate provided by the present disclosure causes the touch electrical field produced by the first touch electrode and the second touch electrode to be away from the liquid crystal layer by forming both the first touch electrode and the second touch electrode on the color filtering substrate so as to reduce the mutual effects between the touch electrical field and the display electrical field.