In-Cell Touch Panel Voltage Selection for Noise Reduction
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Solution Overview
Problem
In-cell type display devices with integrated touch panels face variability in noise levels when applying touch driving voltage, leading to reduced signal-to-noise ratio and touch sensitivity, as the optimal voltage for minimizing noise differs across devices.
Innovation Solution
A method involving the application of multiple sampling voltages to the touch panel electrodes to determine noise levels, comparing these levels to a threshold, and selecting the voltage with the minimum noise as the touch driving voltage, thereby optimizing touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed touch driving voltage is applied to the touch panel, then the device structure is simple, but the noise level varies and touch sensitivity is reduced
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed touch driving voltage to a variable voltage selection mechanism. The system dynamically selects from multiple candidate voltages (e.g., 0.6V, 0.7V, 0.8V, 0.9V) based on measured noise levels, allowing the driving voltage to adapt to different device conditions and optimize touch sensitivity for each specific device.
Solution Approach 2:
The patent implements parameter changes by varying the touch driving voltage across multiple discrete values rather than using a single fixed value. The system measures noise levels at different voltage parameters and selects the optimal voltage that minimizes noise, thereby improving the signal-to-noise ratio and touch sensitivity without requiring complex analog adjustments.
2Measurement precision
If multiple sampling voltages are applied to determine noise levels, then touch sensitivity is optimized, but the measurement process becomes more complex
Solution Approach 1:
The patent applies preliminary action by performing noise level measurements at multiple candidate voltages before finalizing the touch driving voltage selection. The system pre-measures noise levels at different voltages (e.g., 0.6V, 0.7V, 0.8V, 0.9V) and stores these results, then uses the pre-measured data to select the optimal voltage for actual touch operation, avoiding the need for complex real-time adjustments.
Solution Approach 2:
The patent implements feedback by using the measured noise levels at different voltages to guide the selection of the optimal touch driving voltage. The system compares noise levels across multiple voltage candidates and feeds back the optimal voltage choice to the touch panel driver, creating a closed-loop system that optimizes performance based on actual device characteristics.
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 improves the signal-to-noise ratio and enhances touch sensitivity by selecting the most suitable touch driving voltage based on noise level analysis, ensuring consistent performance across different devices.
Implementation Method 1
an in-cell self-capacitive type display device including an integrated touch panel
Data Source
AI summary
A method of driving a display device including an integrated touch panel, the method comprising: applying a plurality of sampling voltages to a plurality of electrodes of the integrated touch panel; determining a plurality of noise levels each of which is associated with a corresponding one of the plurality of sampling voltages; comparing the plurality of noise levels to a threshold level; and selecting a sampling voltage from the plurality of sampling voltages to use as a touch driving voltage based on the comparison of the plurality of noise levels to the threshold level; and applying the selected sampling voltage as the touch driving voltage to the plurality of electrodes.