Transparent Touch Display Device With Vertical Electrode Stacking
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Solution Overview
Problem
Transparent touch display devices face a trade-off between high transmittance and high touch sensitivity due to the degradation of transmittance caused by touch sensor configurations, which necessitate a reduction in the area of touch sensors, leading to lower capacitance and touch sensitivity.
Innovation Solution
A transparent touch display device structure is developed with a substrate featuring light emitting areas, transmissive areas, and touch sensors, where a transparent electrode is placed in transmissive areas to increase touch sensor area without reducing transmissive areas, and the common electrode and insulation film are removed from transmissive areas to reduce parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch sensor configurations including touch electrodes and touch routing wires are formed on the panel, then touch sensitivity is improved, but transmittance is degraded
Solution Approach 1:
The patent places the transparent electrode in the transmissive area, utilizing the vertical stacking dimension to increase touch sensor area without occupying lateral space that would block light transmission. This dimensional repositioning allows the touch sensor to extend into the transmissive area above the common electrode opening, thereby improving touch sensitivity while maintaining high transmittance.
Solution Approach 2:
The patent applies different structural configurations to different areas of the display panel. In the transmissive area, the common electrode has an opening and the transparent electrode is positioned above it, creating a localized structure optimized for both touch sensing and light transmission. This local structural differentiation allows the touch sensor to be enhanced in specific regions without compromising overall transmittance.
2Illumination intensity
If the area of touch sensor is reduced to secure transmittance, then transmittance is improved, but capacitance is lowered and touch sensitivity is degraded
Solution Approach 1:
The patent utilizes the vertical dimension by positioning the transparent electrode above the opening of the common electrode in the transmissive area. This vertical stacking allows the touch sensor area to be effectively increased without expanding the lateral footprint that would reduce light transmission. The transparent electrode overlaps with the common electrode opening in the vertical direction, thereby increasing capacitance while maintaining high transmittance.
Solution Approach 2:
The patent implements a nested structure where the transparent electrode is positioned within the vertical projection of the common electrode opening in the transmissive area. This nesting arrangement allows the touch sensor structure to be contained within the existing display structure boundaries, increasing effective touch sensing area without adding lateral elements that would block light transmission paths.
3Illumination intensity
If common electrode and insulation film are removed from transmissive areas, then parasitic capacitance is reduced and transmittance is improved, but touch sensor area is reduced
Solution Approach 1:
The patent extracts the common electrode and insulation film from the transmissive area by creating an opening in the common electrode and removing the insulation film in that region. This extraction eliminates parasitic capacitance and improves light transmission in the transmissive area. However, to compensate for the reduced touch sensor area, the transparent electrode is positioned above the opening, utilizing the vertical space to maintain effective touch sensing area.
Solution Approach 2:
The patent compensates for the reduced touch sensor area in the transmissive region by positioning the transparent electrode in the vertical dimension above the common electrode opening. This vertical placement allows the touch sensor to maintain effective sensing area without requiring the common electrode and insulation film to be present in the transmissive area, thereby resolving the contradiction between reducing parasitic capacitance and maintaining touch sensor area.
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
This design enhances touch sensitivity by increasing capacitance for touch sensing and transmittance by eliminating overlap capacitance between the transparent electrode and common electrode, thereby improving the overall performance of the transparent touch display device.
Implementation Method 1
enhances touch sensitivity by increasing capacitance for touch sensing
Implementation Method 2
transmittance by eliminating overlap capacitance between the transparent electrode and common electrode
Data Source
AI summary
According to embodiments of the disclosure, a transparent touch display device may comprise a substrate including a display area displaying an image and a non-display area not displaying the image, the display area including a plurality of light emitting areas and a plurality of transmissive areas and a touch sensor including a touch sensor metal disposed while avoiding the plurality of light emitting areas and the plurality of transmissive areas and a transparent electrode disposed in the transmissive areas and electrically connected with the touch sensor metal. The transparent touch display device according to embodiments of the disclosure may provide high transmittance and high touch sensitivity.