Touch Display DC Voltage Distortion Compensation
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Solution Overview
Problem
Touch display devices with built-in touch electrodes face issues such as increased thickness, reduced light transmission efficiency, and higher manufacturing costs due to the need for separate touch panels, as well as distortion of DC voltage caused by increased loads and noise, leading to image defects like faint horizontal lines.
Innovation Solution
A touch display device and method that classify DC voltage distortions based on characteristics and apply corresponding compensation voltages at accurate timings to mitigate these distortions, using a configuration comprising a display panel with touch electrodes, gate and touch driving circuits, and compensation clock and voltage generating circuits to reduce distortion during both overlapping and transition periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch panel is stacked on the display device, then touch detection function is achieved, but device thickness increases and light transmission efficiency decreases
Solution Approach 1:
The patent combines the touch electrode and display electrode into a single electrode layer within the pixel area, eliminating the need for a separate touch panel. This merging approach achieves touch detection functionality while reducing device thickness and improving light transmission efficiency by removing the additional panel structure.
Solution Approach 2:
The built-in touch electrode serves dual functions: it acts as both a display electrode for image rendering and a touch electrode for touch detection. This multi-functionality eliminates the need for separate touch panel structures, thereby reducing thickness while maintaining touch detection capability.
2Reliability
If DC voltage compensation is applied continuously, then voltage distortion is reduced, but energy consumption increases
Solution Approach 1:
The patent applies DC voltage compensation periodically based on detected voltage distortion characteristics rather than continuously. The compensation is triggered only when distortion exceeds a threshold, reducing energy consumption while maintaining voltage stability through targeted, intermittent correction actions.
Solution Approach 2:
The system continuously monitors DC voltage distortion levels and provides feedback to control the compensation mechanism. Compensation is applied only when distortion is detected and exceeds acceptable thresholds, creating a feedback-controlled system that maintains voltage stability while minimizing unnecessary energy consumption from continuous compensation.
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
Effectively reduces DC voltage distortion, preventing image defects and enhancing user experience by accurately compensating for distortions in real-time, thereby improving the reliability and quality of touch display devices.
Implementation Method 1
a compensation clock generating circuit configured to generate DC compensation clocks for determining a DC compensation period by using clock signals that determines rising time and falling time of the plurality of scan signals
Implementation Method 2
a DC voltage generating circuit configured to generate a plurality of DC voltages by using a reference DC voltage
Implementation Method 3
a DC compensation voltage generating circuit configured to generate a DC compensation voltage composed of the plurality of DC voltages by using the DC compensation clock
Implementation Method 4
a touch driving circuit configured to detect touch according to a change in capacitance of the plurality of touch electrodes
Data Source
AI summary
A touch display device can include a display panel including a plurality of touch electrodes; a gate driving circuit to apply a plurality of scan signals to the display panel through a plurality of gate lines; a touch driving circuit to detect touch based on a change in capacitance of the plurality of touch electrodes; a compensation clock generating circuit to generate direct current (DC) compensation clocks for determining a DC compensation period based on clock signals that determine rising times and falling times of the plurality of scan signals. Also, the touch display device can include a DC voltage generating circuit to generate DC voltages based on a reference DC voltage; and a DC compensation voltage generating circuit to generate a DC compensation voltage based on one of the DC voltages and supply the DC compensation voltage to the display panel during the DC compensation period.