Touch Display Drive Electrode Segmentation for Noise Reduction
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Solution Overview
Problem
Display devices with touch detection functions face challenges in securing sufficient touch detection periods while minimizing the influence of display operations, especially as screen size and definition increase, leading to potential noise interference and reduced performance.
Innovation Solution
A display device configuration that includes a substrate with pixel electrodes, signal lines, drive electrodes, touch detection electrodes, and a driver system where the drive electrode driver applies a touch driving signal only to non-selection signal lines, allowing for simultaneous display and touch detection operations without interfering with each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the screen size or definition of the display device is increased, then the display quality is improved, but the display period is relatively increased and the touch detection period cannot be secured enough
Solution Approach 1:
The patent segments the drive electrodes into multiple groups that can be independently controlled. By selectively applying touch detection signals to specific drive electrode groups while others display, the system creates multiple touch detection periods within each frame cycle, ensuring sufficient touch detection time even for high-definition displays with increased display periods.
Solution Approach 2:
The patent implements continuous touch detection capability by maintaining touch detection signals active during periods when other drive electrodes are displaying. This ensures that touch detection is not interrupted and continues seamlessly, providing sufficient detection time without compromising display quality.
2Manufacturing precision
If the display period is increased to achieve large screen size and high definition, then the display quality is improved, but the touch detection becomes weak against noise
Solution Approach 1:
By dividing drive electrodes into multiple independently controllable groups, the system can perform touch detection on one group while another group is displaying. This segmentation allows for multiple touch detection measurements per frame, enabling noise reduction through signal averaging and improving touch detection reliability against noise.
Solution Approach 2:
The patent implements periodic touch detection cycles where touch detection signals are applied in alternating periods with display signals. This periodic action creates multiple sampling opportunities within each frame, allowing for noise filtering and signal verification to improve touch detection reliability.
3Length of stationary object
If the distance between signal line and touch detection electrode is reduced to reduce thickness, then the device thickness is reduced, but the display may affect the touch detection
Solution Approach 1:
The patent segments the drive electrodes into multiple groups that can be independently controlled. By selectively applying touch detection signals to specific drive electrode groups while others are displaying, the system minimizes interference between display and touch detection operations, even when the distance between signal lines and touch detection electrodes is reduced for thinner device 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
This configuration ensures secure touch detection periods even with increased screen size or definition, reducing the risk of noise interference and enabling thinner, larger, or higher-definition displays.
Implementation Method 1
a plurality of touch detection electrodes that are opposed to the plurality of drive electrodes in the vertical direction and capacitively coupled with the plurality of drive electrodes
Data Source
AI summary
A display device with a touch detection function is provided and includes a substrate; pixel electrodes including first and second pixel electrodes; drive electrodes including first and second drive electrodes; a display function layer that exerts an image display function based on a pixel signal; a drive electrode driver configured to apply a touch driving signal for touch detection or a common signal for display to the respective drive electrodes; and a source driver configured to apply the pixel signal to the respective pixel electrodes, wherein when the pixel and common signals are provided, the second pixel electrode is in a floating state and the touch driving signal is provided to the second drive electrode, thereby enabling image display function on a first sub-pixel corresponding to first pixel and drive electrodes and touch detection function on a second sub-pixel corresponding to second pixel and drive electrodes to occur concurrently.