In-Cell Touch Display Electrode Segmentation for Response Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In in-cell touch display systems, increasing the resolution and speeding up touch detection response is challenging due to limited time allocation for touch detection periods within a frame period, making it difficult to repeat touch detection multiple times within a frame period and shorten the interval between successive detections at a single position.
Innovation Solution
The system alternately arranges display periods and touch detection periods within a frame period, using multiple common electrodes divided into groups for touch detection, allowing touch detection in the same first touch detection region and different second touch detection regions, and adjusts the touch detection region based on detected touches to optimize detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch detection is performed in all regions every period, then detection accuracy is improved, but processing time and system complexity increase
Solution Approach 1:
The display screen is divided into multiple touch detection regions, and the common electrodes are correspondingly divided into multiple groups. During each touch detection period, only one specific touch detection region and its corresponding electrode group are activated for detection, while other regions remain inactive. This segmentation allows the system to maintain comprehensive detection capability across the entire screen while reducing the processing load per period, as the touch detection circuit only needs to process signals from one region at a time rather than all regions simultaneously.
2Reliability
If touch detection period is extended to cover entire screen, then detection completeness is improved, but response speed decreases
Solution Approach 1:
The system implements periodic touch detection by sequentially activating different touch detection regions in different touch detection periods. Each region is detected repeatedly across multiple periods, ensuring that every part of the screen undergoes comprehensive detection over time. This periodic approach maintains detection completeness while enabling faster response within each period, as the system can quickly cycle through multiple regions rather than scanning the entire screen in a single prolonged operation.
3Area of stationary object
If multiple touch detection regions are monitored simultaneously, then detection coverage is improved, but processing time increases
Solution Approach 1:
The screen is segmented into multiple touch detection regions, each associated with a specific group of common electrodes. During any given touch detection period, only one region is actively monitored while others are inactive. This segmentation strategy ensures that the entire screen coverage is achieved over the course of multiple periods, while the processing time per period is minimized by focusing detection resources on a single region at a time.
Solution Approach 2:
The system pre-organizes the common electrodes into multiple groups that correspond to different touch detection regions. This preliminary organization allows for efficient switching between regions during operation, as the electrode groupings are already established and ready for sequential activation. The pre-configured structure enables rapid transitions between regions without requiring complex real-time reconfiguration, thereby reducing processing time while maintaining comprehensive coverage.
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 enables faster response to touch detections in designated regions, improving the sensitivity and speed of touch detection, especially when a touch is sustained, while maintaining detection accuracy and reducing the number of touch detection signals processed during each period.
Implementation Method 1
a touch detection circuit that performs detection of a touch by an object on the display device, based on a touch detection signal received from each of the multiple common electrodes
Data Source
AI summary
In a display system, a display device includes multiple common electrodes used for both image display and touch detection. Within a frame period of the display device, a display period for which the display device displays an image and a touch detection period for which a touch detection circuit performs touch detection are alternately arranged. The display device includes a first touch detection region and multiple second touch detection regions, configured by dividing multiple common electrodes into multiple groups. During multiple touch detection periods, the touch detection circuit performs touch detection in the same first touch detection region and in a second touch detection region different for each touch detection period.