Touch Bridge Layout for Low-Crosstalk Transparent Displays
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Solution Overview
Problem
Touch sensitivity is reduced in self-luminous display devices due to parasitic capacitance caused by display-related electrodes or lines, leading to issues like reduced transmittance, display-to-touch crosstalk (DTX), parasitic capacitance, and ghost touches.
Innovation Solution
A touch display device with a touch bridge structure that includes a first sub-touch bridge not overlapping with the touch sensor, reducing parasitic capacitance and load, and incorporating a temperature sensor to compensate touch sensing values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor is built into a display panel, then touch functionality is integrated, but parasitic capacitance increases due to surrounding electrical patterns, reducing touch sensitivity
Solution Approach 1:
The touch bridge structure is divided into a main touch bridge extending in the row direction and sub-touch bridges extending in the column direction. This segmentation allows the touch sensor to be electrically connected to touch lines while minimizing overlap with display electrodes, thereby reducing parasitic capacitance and maintaining touch sensitivity.
Solution Approach 2:
The touch bridge structure acts as an intermediary component that electrically connects the touch sensor to touch lines while physically separating it from display electrodes. This mediator approach allows the touch sensor to function independently without being directly influenced by display-related electrical patterns, reducing parasitic capacitance effects.
2Reliability
If touch bridge structures are added to connect touch sensors, then touch sensitivity is improved, but transmittance may be reduced due to additional structures
Solution Approach 1:
The touch bridge structure utilizes the row and column directional dimensions separately, with the main touch bridge extending in the row direction and sub-touch bridges extending in the column direction. This dimensional arrangement allows the touch bridge to connect touch sensors effectively while minimizing visual interference and maintaining display transmittance.
3Adaptability or versatility
If touch sensors are placed adjacent to subpixels, then integrated touch-display functionality is achieved, but display-to-touch crosstalk increases
Solution Approach 1:
The touch sensor is segmented and connected to touch lines through the divided touch bridge structure (main touch bridge and sub-touch bridges), which reduces the overlapping area with display electrodes. This segmentation minimizes electromagnetic interference and crosstalk between display and touch functions while maintaining integrated functionality.
4Measurement precision
If temperature sensing is added to compensate touch values, then touch accuracy under temperature variations is improved, but device complexity increases
Solution Approach 1:
The temperature sensing function is merged with the existing touch sensor structure by using the same touch sensor to detect both touch events and temperature variations. This combination approach allows temperature compensation without adding separate temperature sensors, thereby maintaining touch accuracy under temperature variations while avoiding increased device complexity.
Data Source
AI summary
A touch display device may include a first touch sensor disposed in a transparent area, a first touch line electrically connected to the first touch sensor and extending in a column direction, a first touch bridge electrically connected to the first touch line and extending in a row direction, and a first sub-touch bridge electrically connected to the first touch bridge and the first touch sensor, extending in the column direction, and not overlapping with the first touch sensor.