Integrated Touch Sensor Noise Reduction via Segmented Driving
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Solution Overview
Problem
Integrated touch sensors in display panels face reduced sensitivity and recognition rates due to noise interference from signal lines connected to pixels, which affects the accuracy of touch recognition.
Innovation Solution
A display system with integrated touch sensors that includes a display panel, a display data driving circuit maintaining a specific DC voltage during the touch sensor driving period, a display scan driving circuit that supplies scan pulses synchronized with analog video data, and a touch sensor driving circuit that applies driving pulses to the Tx lines, minimizing noise interference by maintaining gate lines at a low voltage during touch sensor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If touch sensors are integrated in the display panel, then the device achieves thin profile and lightness, but noise from pixel signal lines reduces touch sensor sensitivity and recognition rate
Solution Approach 1:
The patent divides the operating time into distinct periods: a display period for pixel operation and a touch sensor driving period for touch detection. During the touch sensor driving period, pixel signal lines are inactive, separating the operational phases to eliminate noise interference while maintaining integration benefits
Solution Approach 2:
The patent applies preliminary action by maintaining data lines at a specific DC voltage level before touch sensor measurement begins. This pre-establishes a stable electrical environment, preventing noise from pixel signal lines from affecting the touch sensor sensitivity and recognition rate
2Illumination intensity
If gate lines supply large swing voltage to pixels, then display performance is improved, but noise components reduce touch sensor recognition rate
Solution Approach 1:
The patent implements periodic action by alternating between display periods (with large voltage swing for pixel operation) and touch sensor driving periods (with stabilized voltages for touch detection). This periodic separation allows both high display performance and reliable touch recognition without continuous interference
Solution Approach 2:
The patent converts the harmful noise from gate line voltage swing into a beneficial separation strategy. By intentionally stopping gate line updates during touch measurement periods and maintaining stable voltages, the same signal lines that cause noise during display operation become stable measurement channels during touch detection
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 approach effectively reduces noise components in the touch signals, enhancing the sensitivity and recognition rate of touch sensors by isolating noise effects from signal lines connected to the pixels, thereby improving touch detection accuracy.
Implementation Method 1
capacitance type touch sensors comprise mutual capacitance formed at intersections between signal lines Tx and Rx crossing each other... the capacitance type touch sensors can recognize a touch by measuring a change in the amount of charge of the mutual capacitance
Data Source
AI summary
A display with integrated touch sensor and a driving method thereof are provided. The display comprises a display data driving circuit that supplies analog video data voltages to data lines of a display panel during a display period and maintains the voltage of the data lines at the same specific DC voltage during a touch sensor driving period; a display scan driving circuit that sequentially supplies scan pulses synchronized with the analog video data voltages to the gate lines of the display panel during the display period; a touch sensor driving circuit that sequentially supplies driving pulses to the Tx lines of the display panel during the touch sensor driving period; and a touch sensor readout circuit that receives a touch signal from the mutual capacitances via the Rx lines of the display panel during the touch sensor driving period.