Display Device Touch Electrode Parasitic Capacitance Reduction
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Solution Overview
Problem
Display devices with touch screen structures face errors in touch sensing due to significant parasitic capacitance between touch electrodes and display elements, which affects accuracy.
Innovation Solution
A display device design that includes spacers to maintain a gap between touch electrodes and display elements, along with light reflection patterns on the first base substrate, which are strategically positioned and shaped to minimize parasitic capacitance by creating a sufficient gap and uniform light reflection, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrodes are placed close to display elements to improve touch sensitivity, then touch sensing capability is improved, but parasitic capacitance increases causing sensing errors
Solution Approach 1:
The patent introduces light reflection patterns as intermediary structures between the touch electrodes and display elements. These patterns are positioned on the first base substrate in regions corresponding to the touch electrodes, creating optical pathways that reduce direct electromagnetic coupling and parasitic capacitance while maintaining touch sensing functionality.
Solution Approach 2:
The patent utilizes the optical dimension by introducing light reflection patterns that reflect light from the display elements back toward the touch electrodes. This dimensional approach (using light reflection) creates a functional separation that reduces electrical parasitic capacitance while maintaining the spatial proximity needed for touch sensitivity.
2Object-affected harmful factors
If spacers are added to maintain gap between substrates to reduce parasitic capacitance, then parasitic capacitance is reduced, but device complexity increases
Solution Approach 1:
The light reflection patterns serve multiple functions simultaneously: they reduce parasitic capacitance by maintaining effective spacing, provide light reflection to enhance display visibility, and can be integrated into the existing substrate structure. This multi-functionality reduces the need for separate components.
Solution Approach 2:
The patent merges the light reflection function with the parasitic capacitance reduction function into a single integrated structure. The light reflection patterns are formed as part of the substrate architecture rather than as separate added components, combining multiple benefits in one element.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes undesirable parasitic capacitance between touch electrodes and display elements, enhancing touch sensing accuracy and user experience by maintaining a consistent gap and uniform light reflection across the display.
Implementation Method 1
light reflection patterns disposed on the first base substrate to correspond to the second region
Data Source
AI summary
A display device includes a first substrate, a second substrate, a transistor, a display element, a first touch electrode, a second touch electrode, a spacer, and a light reflector. The second substrate overlaps the first substrate. The transistor is positioned between the first substrate and the second substrate. The display element is electrically connected to the transistor. The first touch electrode contacts the second substrate. The second touch electrode contacts the second substrate and is insulated from the first touch electrode. The spacer overlaps the first touch electrode and is positioned between the first touch electrode and the first substrate. The light reflector overlaps the second touch electrode, is positioned between the second touch electrode and the first substrate, and is spaced from the spacer. A distance between the light reflector and the second touch electrode is greater than a distance between the spacer and the first touch electrode.