Touch Display Device DC Voltage Distortion Compensation
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Solution Overview
Problem
Touch display devices with built-in touch electrodes face distortion in DC voltage due to increased load, affecting image quality and manufacturing costs, as they require separate touch panels and suffer from reduced light transmission efficiency.
Innovation Solution
A touch display device with a touch driving circuit that classifies DC voltage distortions based on characteristics, periods, and electrode structure, applying compensation voltages during overlap and transition distortion periods to mitigate these issues.
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 the device thickness increases and light transmission efficiency decreases
Solution Approach 1:
The patent combines the touch electrode and display electrode into a single shared electrode structure. The touch electrode serves dual purposes: as a touch sensing element and as a display electrode for image rendering. This merging eliminates the need for separate touch panel stacking, thereby reducing device thickness while maintaining both touch detection and display functions.
Solution Approach 2:
The shared electrode structure performs multiple functions simultaneously. It acts as both a touch sensing electrode for detecting touch inputs and a display electrode for rendering images. This multi-functionality allows the device to achieve touch detection capability without adding the thickness associated with separate touch panel layers.
2Adaptability or versatility
If a separate touch panel is stacked on the display device, then touch detection function is achieved, but light transmission efficiency decreases
Solution Approach 1:
By merging the touch electrode and display electrode into a single structure, the patent eliminates additional transparent conductive layers that would otherwise be required for separate touch panels. This reduction in layer count minimizes light absorption and scattering, thereby improving light transmission efficiency while maintaining touch detection functionality.
3Measurement precision
If the size and resolution of the display panel are increased, then display quality is improved, but the load on the touch electrode increases causing DC voltage distortion
Solution Approach 1:
The patent divides the touch electrode into multiple independent segments or regions. Each segment can be independently controlled and compensated. This segmentation allows the system to manage the electrical load more effectively across high-resolution displays, preventing cumulative voltage distortion that would occur in a single large electrode while maintaining overall display quality.
Solution Approach 2:
The patent dynamically adjusts electrical parameters such as voltage levels and driving waveforms for different regions of the touch electrode. By changing these parameters based on the specific load conditions of each segment, the system compensates for voltage distortion caused by increased size and resolution, thereby maintaining DC voltage stability across the entire display.
4Volume of moving object
If advanced in-cell touch (AIT) display devices are used, then device thickness is reduced, but DC voltage distortion occurs due to touch electrode load
Solution Approach 1:
The patent segments the touch electrode into multiple controllable regions, allowing independent compensation for voltage distortion in each segment. This segmentation enables the thin AIT structure to maintain voltage stability despite the increased electrical load, as each segment can be optimized and compensated separately rather than as a single large electrode.
Solution Approach 2:
The patent implements dynamic parameter adjustment for the touch electrode driving signals. By modifying voltage levels, driving frequencies, and waveform characteristics based on real-time load conditions, the system compensates for DC voltage distortion in the thin AIT structure, maintaining reliability while preserving the thickness advantages of the in-cell design.
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, enhancing image quality and reducing manufacturing costs by optimizing touch electrode design and compensation voltage application.
Implementation Method 1
a touch driving circuit configured to detect touch sensing operation according to a change in capacitance of the plurality of touch electrodes
Implementation Method 2
the direct current (DC) voltage supplied to the touch electrode is distorted, causing an error in the image displayed on the display panel
Data Source
AI summary
Embodiments of the disclosure relate to a touch display device, a touch driving circuit, and a touch driving method. Specifically, a touch display device comprises a display panel including a plurality of touch electrodes, a gate driving circuit configured to supply a plurality of scan signals to the display panel through a plurality of gate lines, a touch driving circuit configured to detect touch according to a change in capacitance of the plurality of touch electrodes, and a power management circuit configured to supply a different level of compensation voltages to the plurality of touch electrodes in each of an overlap distortion period in a display driving period, a transition distortion period of the display driving period, and a touch driving period.