Display Device Touch Sensor Voltage Control for Noise Reduction
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Solution Overview
Problem
Conventional mobile devices with large touch screens face issues of increased power consumption and noise interference between display panel and touch panel driving chips, leading to reduced touch accuracy and increased touch errors due to parasitic capacitance.
Innovation Solution
A display device with a sensor unit that includes gripping sensors and touch sensors, where the signal controller adjusts the voltage applied to sensing input signal lines based on gripping signals to minimize noise and optimize touch accuracy, applying higher voltage to likely touched areas and lower voltage to less likely areas, and adjusting according to Gaussian or inverse Gaussian distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same voltage is applied to all sensing input signal lines in a large touch screen, then the touch screen can be driven uniformly, but power consumption increases
Solution Approach 1:
The patent applies different voltage levels to different sensing input signal lines based on their position and touch likelihood. Specifically, sensing input signal lines corresponding to gripping sensor positions are applied with higher voltage (first voltage level), while other lines receive lower voltage (second voltage level). This local differentiation reduces overall power consumption while maintaining touch detection accuracy where it matters most.
2Adaptability or versatility
If display panel driving chip and touch panel driving chip are driven simultaneously, then the device functions are enabled, but noise is mutually induced between the two chips
Solution Approach 1:
The patent introduces a sensor unit with gripping sensors as an intermediary layer between the display panel and touch panel. This sensor unit detects touch positions and provides position information that allows the control logic to differentiate between display scanning and touch sensing operations, thereby reducing mutual noise interference while maintaining simultaneous functionality of both chips.
3Measurement precision
If higher voltage is applied to all sensing input signal lines, then touch detection sensitivity is improved, but noise from parasitic capacitance increases
Solution Approach 1:
The patent applies higher voltage only to sensing input signal lines that correspond to positions where touches are most likely to occur (grip zones detected by gripping sensors), while applying lower voltage to other lines. This localized high-voltage application improves touch detection sensitivity at critical positions without increasing parasitic capacitance noise across the entire touch screen.
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 solution reduces power loss, improves touch accuracy, and minimizes touch errors by effectively managing parasitic capacitance and noise interference, enabling a high-resolution touch screen with enhanced user interaction.
Implementation Method 1
a sensor unit including gripping sensors corresponding to the sensing input signal lines, the sensor unit configured to generate a gripping signal including touch information of a first gripping sensor and position information of a first sensing input signal line corresponding to the first gripping sensor
Implementation Method 2
touch sensors disposed on the sensing input signal lines and the sensing output signal lines
Data Source
AI summary
A display device including a display panel, a plurality of gripping sensors at a side of the display device and configured to detect a gripping of the side of the display device, and a plurality of touch sensors on the display panel and configured to generate a sensing output signal based on sensing input signals, in which the sensing input signals having different enable voltages are applied to the plurality of touch sensors, and the different enable voltages are determined according to the gripping.