Touch Display Device Crosstalk Reduction via Adaptive Uplink Modes
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Solution Overview
Problem
Touch display devices experience image quality degradation due to noise in data voltages caused by uplink signals transmitted to active styluses, especially as electrodes and data lines become closer, leading to crosstalk and image defects like bright or dark lines.
Innovation Solution
Implementing a touch driving method that alternates between a global uplink mode during blank periods and a local uplink mode during display-driving periods, where the touch circuit supplies global uplink signals to the entire panel and local uplink signals with different phases to specific regions, respectively, to minimize deviations in data voltages and compensate for crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the touch electrodes and data lines are spaced closer together to make the display device lighter and thinner, then the device weight and thickness are reduced, but the uplink signal causes noise in the data voltage, deteriorating image quality
Solution Approach 1:
The patent applies periodic action by alternating between global uplink mode during blank periods and local uplink mode during display-driving periods. The touch circuit periodically switches between transmitting uplink signals to the entire panel and transmitting to specific regions, thereby reducing continuous noise interference with data lines while maintaining communication functionality.
Solution Approach 2:
The patent segments the display panel into multiple regions and divides the uplink signal transmission into global and local modes. By segmenting the transmission scope, the system can limit uplink signal interference to specific regions during display periods while maintaining overall communication during blank periods, thus reducing crosstalk with data lines.
2Reliability
If the uplink signal is transmitted to the entire display panel during display-driving period, then the stylus communication is maintained, but the data voltage experiences noise and crosstalk
Solution Approach 1:
The patent applies local quality by switching from global uplink mode to local uplink mode during display-driving periods. Instead of transmitting uplink signals to the entire panel, the system transmits only to specific local regions where the stylus is detected, thereby reducing crosstalk noise in data lines while maintaining necessary communication with the stylus.
Solution Approach 2:
The patent implements dynamics by making the uplink signal transmission adaptive based on display period status and stylus position. The system dynamically switches between global and local modes, and adjusts transmission regions based on real-time stylus detection, thereby optimizing communication reliability while minimizing harmful crosstalk interference.
3Use of energy by moving object
If the global uplink mode is used during display-driving period, then the uplink signal reaches the stylus effectively, but the image quality deteriorates due to voltage deviations
Solution Approach 1:
The patent applies partial action by using local uplink mode during display-driving periods instead of global mode. The system transmits uplink signals only to the necessary local region where the stylus is present, rather than the entire panel, thereby maintaining effective communication with the stylus while minimizing voltage deviations that would degrade image quality.
Data Source
AI summary
A touch display device and a touch driving method are presented herein. The touch display device includes a display panel having a plurality of touch electrodes, a drive circuit configured to drive the display panel, a touch circuit configured to detect a position of a stylus relative to the display panel using a downlink signal transmitted from the stylus, and a timing controller configured to control the drive circuit and the touch circuit. During a blank period while operating in a global uplink mode, the touch circuit supplies a global uplink signal to an entirety of the display panel. During a display-driving period while operating in a local uplink mode, the touch circuit supplies a plurality of local uplink signals having different phases to a plurality of regions of the display panel.