Touch Display Screen Electrode Placement Within Black Matrix
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Solution Overview
Problem
Current touch display screens with Add on Mode Touch Panels have complex manufacturing processes, high costs, precision issues due to separate production of touch and liquid crystal display screens, and suffer from low light transmissivity due to indium tin oxide (ITO) electrodes and air gaps, leading to increased thickness and cost.
Innovation Solution
A touch display screen design featuring a first and second touch electrode arranged within the black matrix area of the opposite substrate, with an insulating layer and optional polarizer, utilizing nano conductive ink and transparent conductive materials to reduce light reflection and absorption, and eliminate the need for protective glass, thereby enhancing light transmissivity and fitting precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ITO is used as the material of the touch driving electrode and touch sensing electrode on the protective glass, then the transparency of the electrodes can be utilized, but light absorption and reflection occur resulting in high light reflectivity and low transmissivity
Solution Approach 1:
The patent extracts the touch electrodes from the protective glass and relocates them to the array substrate side, specifically within the black matrix area. This extraction eliminates the harmful light absorption and reflection caused by ITO on the protective glass while maintaining electrode transparency and functionality.
Solution Approach 2:
The patent changes the spatial dimension by moving the electrodes from the protective glass surface to the array substrate side. This dimensional relocation allows the electrodes to be positioned in an area (black matrix region) that does not interfere with the light transmission path, thereby resolving the contradiction between electrode functionality and light transmissivity.
2Strength
If a protective glass is used for the touch screen, then the structural integrity is improved, but the thickness, quality and use cost of the product are increased
Solution Approach 1:
The patent merges the touch electrode structure with the array substrate by forming electrodes directly on the array substrate within the black matrix area. This integration eliminates the need for a separate protective glass layer, thereby reducing overall thickness while maintaining structural integrity through the unified design.
Solution Approach 2:
The patent employs thin film structures for the touch electrodes formed on the array substrate, replacing the thick protective glass with thin conductive layers. This approach maintains the necessary structural properties while significantly reducing the overall thickness of the display device.
3Adaptability or versatility
If the touch screen and liquid crystal display screen are produced separately and fitted together (Add on Mode), then the manufacturing flexibility is maintained, but the manufacturing process becomes complex with high turnover cost and processing cost
Solution Approach 1:
The patent combines the touch electrode formation process with the liquid crystal display manufacturing process by forming electrodes directly on the array substrate before assembly. This integration merges two previously separate manufacturing processes into one, reducing complexity and turnover costs while maintaining manufacturing flexibility.
4Ease of manufacture
If the touch electrodes are manufactured on the protective glass, then the transparency of the ITO can be utilized without considering the wiring position, but the fitting precision between touch screen and liquid crystal display screen is reduced
Solution Approach 1:
The patent performs preliminary action by forming the touch electrodes on the array substrate before the assembly process. This advance positioning of electrodes within the black matrix area ensures precise alignment and fitting during subsequent assembly steps, eliminating precision issues associated with post-assembly electrode placement.
Data Source
AI summary
This disclosure discloses a touch display screen, a manufacturing method thereof and a display device. The touch display screen comprises: an opposite substrate, an array substrate, and a liquid crystal layer located between the opposite substrate and the array substrate, a side of the opposite substrate facing the liquid crystal layer being provided with a black matrix. The touch display screen further comprises: a first touch electrode, an insulating layer and a second touch electrode arranged in stack successively at a side of the opposite substrate back to the liquid crystal layer. The first touch electrode and the second touch electrode are located within an area corresponding to the black matrix respectively. The first touch electrode comprises a plurality of first touch sub-electrodes distributed along a first direction. The second touch electrode comprises a plurality of second touch sub-electrodes distributed along a second direction perpendicular to the first direction.