Touch Display Bridge Structure for Temperature-Related Ghost Touches
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Solution Overview
Problem
Touch sensitivity in touch display devices is reduced due to parasitic capacitance and variance in parasitic capacitance, leading to ghost touches being recognized even after a touch input is ended or when an image is changed.
Innovation Solution
A touch display device with a temperature-sensing-enabled touch sensor structure and a shared touch bridge structure that reduces parasitic capacitance and load, using a common touch bridge and dummy touch bridge lines to compensate for variations in parasitic capacitance and temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor is embedded in a display panel with electrical patterns around it, then the display functionality is integrated, but parasitic capacitance increases and touch sensitivity is reduced
Solution Approach 1:
The patent introduces a touch bridge line as an intermediary component to connect touch sensors while minimizing parasitic capacitance impact. The touch bridge line serves as a mediator that reduces the harmful electrical coupling between adjacent touch sensors and display electrical patterns, thereby maintaining touch sensitivity while preserving the integrated display-touch structure.
Solution Approach 2:
The patent extracts the touch sensing function from the main display circuitry by using separate touch bridge lines dedicated solely to touch sensor connections. This separation removes the parasitic capacitance problem caused by shared electrical patterns, allowing the touch function to operate independently with improved sensitivity while the display function continues uninterrupted.
2Area of stationary object
If touch sensors are arranged in adjacent pixel areas, then the touch coverage area is increased, but parasitic capacitance variance occurs and ghost touches are generated
Solution Approach 1:
The touch bridge line acts as an intermediary connection between adjacent touch sensors, reducing the parasitic capacitance coupling that occurs when touch sensors are placed in adjacent pixel areas. This mediator structure allows extended touch coverage while preventing the capacitance interference that would otherwise cause ghost touches and reduce detection accuracy.
Solution Approach 2:
The patent employs touch bridge lines to create equipotential connections between adjacent touch sensors, minimizing potential differences and parasitic capacitance effects. By maintaining equipotential conditions across the extended touch sensor array, the system achieves broad coverage without the measurement precision degradation that would normally result from adjacent sensor interference.
3Power
If electrical patterns are disposed around touch sensors for display driving, then the display performance is improved, but parasitic capacitance increases and touch sensitivity is reduced
Solution Approach 1:
The touch bridge line serves as a specialized intermediary that connects touch sensors while being electrically isolated from the high-power display driving patterns. This mediator structure allows the display electrical patterns to operate at full power for optimal display performance while the touch bridge line maintains low parasitic capacitance for accurate touch sensing.
Solution Approach 2:
The patent segments the electrical infrastructure into separate display driving circuits and touch sensing circuits connected via touch bridge lines. This segmentation allows the display electrical patterns to be optimized for performance independently from the touch sensing requirements, preventing the parasitic capacitance that would otherwise couple the two functions and degrade touch sensitivity.
Data Source
AI summary
The present disclosure provides a touch display device comprising first and second subpixels included in adjacent first and second pixel areas in a column direction, first and second touch sensors respectively adjacent to the first and second pixel areas in a row direction, a first touch line electrically connected to the first and second touch sensors and extending in the column direction, a first sensing line extending in the column direction, a first sensing transistor configured to control an electrical connection between the first sensing line and the first touch sensor, a second sensing transistor configured to control electrical connection between the first sensing line and the second touch sensor, and a common touch bridge electrically connecting the first touch sensor and the second touch sensor to the first touch line. The touch display device can perform more accurate touch sensing by removing a ghost touch that may be caused by a temperature effect. In addition, the touch display device may reduce parasitic capacitance and load related to the touch sensor structure.