Touch Display Sensor Integration to Prevent Temperature Ghost Touches
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Solution Overview
Problem
Touch sensitivity in display devices deteriorates due to parasitic capacitance from surrounding electrical patterns, leading to ghost touches, which are unrecognized changes in touch recognition caused by organic materials in the display panel.
Innovation Solution
A touch display device with a combined temperature and touch sensor structure that compensates for touch sensitivity by sensing current changes reflecting temperature, preventing ghost touches through a first pixel area with a first touch sensor, first touch line, and first sensing line, using a first scanning gate line to control both transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor is embedded in the display panel, then touch sensing function is integrated, but parasitic capacitance increases causing ghost touches
Solution Approach 1:
A sensing line is introduced as an intermediary element between the touch sensor and the surrounding electrical patterns. This sensing line acts as a mediator to detect and compensate for parasitic capacitance changes caused by display operations, thereby reducing ghost touches while maintaining the integrated touch sensing function.
Solution Approach 2:
The patent implements a feedback mechanism where the sensing line continuously monitors parasitic capacitance changes in the touch sensor caused by display operations. Based on this feedback, the system adjusts touch sensing parameters to compensate for the parasitic capacitance, effectively reducing ghost touches while maintaining accurate touch detection.
2Device complexity
If touch sensor is embedded in display panel, then device structure is simplified, but touch sensitivity deteriorates
Solution Approach 1:
The sensing line serves as an intermediary that monitors and compensates for parasitic capacitance changes affecting touch sensitivity. By detecting these changes and providing compensation signals, the system maintains high touch sensitivity despite the simplified embedded structure.
Solution Approach 2:
The patent dynamically adjusts touch sensing parameters based on detected parasitic capacitance changes. By changing operational parameters such as sensing thresholds and timing, the system maintains accurate touch sensitivity while benefiting from the simplified embedded display structure.
3Device complexity
If scanning transistor controls both display and sensing, then device complexity is reduced, but control precision decreases
Solution Approach 1:
The scanning transistor operates in periodic cycles, alternately performing display driving and sensing operations. During specific time periods, it controls the sensing line to measure parasitic capacitance, while at other periods it drives the display. This periodic separation maintains control precision despite using a single transistor for both functions.
Solution Approach 2:
The scanning transistor dynamically switches between different control modes - display driving mode and sensing mode. By adaptively changing its function based on operational requirements, the single transistor maintains high precision in both display and touch sensing operations without requiring separate dedicated transistors.
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 prevents ghost touches by compensating for touch sensitivity changes due to temperature fluctuations, maintaining accurate touch recognition and reducing device weight and process complexity by embedding sensors within the display panel.
Implementation Method 1
A touch display device with a combined temperature and touch sensor structure that compensates for touch sensitivity by sensing current changes reflecting temperature
Data Source
AI summary
Embodiments of the disclosure relate to a touch display device and a touch sensing method and may specifically include a first pixel area, a first touch sensor area positioned on one side of the first pixel area, a first subpixel disposed in the first pixel area and including a light emitting element and a scanning transistor, a first display driving line connected to the first subpixel, a first touch sensor disposed in the first touch sensor area, a first sensing line disposed adjacent to the first touch sensor, a first touch line electrically connected to the first touch sensor, and a first sensing transistor controlling an electrical connection between the first sensing line and the first touch sensor, thereby removing a ghost touch that may occur due to temperature influence.