Touch Electrode Uplink Timing for Reliable Pen and Finger Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in efficiently supporting both touch input from fingers and active pens while maintaining reliable sensing performance, particularly with larger and faster displays, leading to degradation in touch recognition reliability.
Innovation Solution
A display device and system that incorporates a touch array with touch electrodes, a touch driver to transmit uplink signals, and a touch controller to determine an uplink period based on image data, allowing for improved touch recognition by overlapping the uplink period with the active or blank periods of the frame period to minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device transmits uplink signals continuously to support active pen touch input, then touch recognition capability is improved, but noise interference from image data increases and sensing reliability deteriorates
Solution Approach 1:
The touch driver transmits uplink signals only during specific uplink periods rather than continuously, synchronizing signal transmission with periods when noise interference is minimized. This periodic transmission approach maintains touch recognition capability while reducing noise interference that would otherwise degrade sensing reliability.
Solution Approach 2:
The system determines optimal uplink periods in advance based on image data characteristics before transmitting uplink signals. By preliminarily analyzing when noise interference will be minimal and scheduling uplink signal transmission accordingly, the system ensures reliable touch sensing without requiring continuous signal transmission.
2Adaptability or versatility
If the display device supports both finger touch and active pen input simultaneously, then versatility is improved, but sensing performance degradation occurs
Solution Approach 1:
The touch driver implements periodic uplink signal transmission during designated uplink periods, allowing the system to maintain support for both finger and active pen touch inputs while ensuring that signal transmission occurs only when noise interference is minimal, thereby preserving sensing performance accuracy.
3Productivity
If the display device increases display size and speed, then productivity is improved, but touch sensing reliability deteriorates
Solution Approach 1:
The system implements periodic uplink signal transmission synchronized with display frame periods, allowing larger and faster displays to maintain reliable touch sensing by transmitting signals only during optimal uplink periods when noise interference from high-speed display operations is minimized.
Data Source
AI summary
A display device, includes: a display panel including pixels; a display driver configured to operate in a unit of a frame period including an active period and a blank period and to display an image on the display panel in the active period of the frame period, based on image data; a touch array on the display panel and including touch electrodes; a touch driver configured to transmit, in an uplink period, uplink signals including different information to an external device in proximity to the touch array through the touch electrodes, and to receive, from the external device, a sensing signal generated by the external device using at least some of the uplink signals; and a touch controller configured to determine the uplink period based on the image data.