Touch Screen Electrode Segmentation for Simultaneous Display and Sensing
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Solution Overview
Problem
Conventional display devices with touch screens face challenges in ensuring adequate touch sensing time and display quality due to temporal separation of display and touch periods, leading to insufficient charging time for display driving.
Innovation Solution
A display device with a touch screen that spatially separates display and touch operations by grouping electrodes into multiple groups, allowing simultaneous display driving and touch sensing through the application of gate signals and touch scan signals to different groups, ensuring a longer touch sensing time and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display periods are temporally separated from touch periods, then touch sensing operation can be performed, but touch sensing time is insufficient and display charging time is insufficient leading to deterioration of display quality
Solution Approach 1:
The electrodes are divided into multiple groups (first group, second group, third group) that can be independently controlled. This segmentation allows different groups to perform different functions simultaneously - some groups for display driving while others for touch sensing, thereby resolving the time conflict between display charging and touch sensing operations
Solution Approach 2:
The patent transitions from temporal separation (one operation after another in time) to spatial separation (different operations occurring simultaneously in different electrode groups). By adding the spatial dimension of electrode grouping, both display and touch operations can proceed concurrently without interfering with each other
2Ease of operation
If display periods are temporally separated from touch periods, then touch sensing operation can be performed, but display driving charging time is insufficient
Solution Approach 1:
By segmenting electrodes into multiple independently controllable groups, the system can dedicate specific groups to touch sensing operations while maintaining adequate charging time for display driving in other groups, thus ensuring both ease of touch operation and reliability of display quality
Solution Approach 2:
The electrode groups serve multiple functions - they can be used for display driving, touch sensing, or both simultaneously depending on the configuration. This multi-functionality allows the system to perform touch sensing operations effectively while maintaining display quality through sufficient charging time
3Productivity
If electrodes are grouped into multiple groups for spatial separation, then simultaneous display and touch driving is enabled, but device structure becomes more complex
Solution Approach 1:
While segmentation into multiple electrode groups does increase structural complexity, it enables simultaneous display and touch driving operations, significantly improving productivity. The segmentation is implemented in a systematic way that balances the added complexity with the substantial performance gains
Data Source
AI summary
A display device including a touch screen and method of driving the same are provided. In a method of driving display device including a touch screen, the display device including a panel including a plurality of gate lines, and a plurality of electrodes respectively corresponding to the plurality of gate lines, the method includes: applying, by a display driving unit, a gate signal to a subset of the plurality of gate lines, applying, by a touch sensing unit: a common voltage to a first subset of the plurality of electrodes corresponding to the subset of the plurality of gate lines, and the touch scan signal to a second subset of the plurality of electrodes, other than the first subset of the plurality of electrodes.