Touch Display Timing Controller Signal Compensation
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Solution Overview
Problem
Advanced in-cell touch (AIT) display devices experience image distortion due to potential differences and physical structure variations between touch nodes, leading to degraded image quality during both display and touch operations.
Innovation Solution
A touch display device with a timing controller that compensates display signals by applying preset compensation values to subpixels based on position and physical structure differences, dividing subpixels into compensation areas and adjusting pulse widths of gate signals to minimize distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is used with in-cell touch sensors, then both image display and touch sensing functions are integrated, but potential differences between touch nodes cause display image distortion
Solution Approach 1:
The timing controller pre-stores compensation values for different touch node conditions before actual touch operations occur. During display operations, the controller retrieves and applies the appropriate compensation value based on the current touch node state, preventing image distortion before it happens rather than correcting it afterward
Solution Approach 2:
The system dynamically changes display parameters (data signals and gate signals) based on the touch node's condition. By detecting whether a touch node is in a touched or non-touched state, the timing controller adjusts signal parameters such as voltage levels and timing to compensate for potential differences, thereby maintaining consistent display quality across different touch states
2Productivity
If touch operation and display operation alternate in frame periods, then touch sensing is enabled, but image distortion occurs during display operation due to touch node condition differences
Solution Approach 1:
The system implements a feedback mechanism where the touch controller monitors touch node conditions during touch operations and communicates this information to the timing controller. The timing controller uses this feedback to determine the appropriate compensation value to apply during subsequent display operations, creating a closed-loop system that adapts to changing touch node states
Solution Approach 2:
Compensation values are calculated and stored in advance based on expected touch node conditions. When a display operation follows a touch operation, the timing controller quickly applies the pre-prepared compensation value corresponding to the touch node's current state, enabling rapid adaptation without compromising display quality
3Manufacturing precision
If compensation values are applied to data signals and gate signals, then image distortion is reduced, but processing complexity increases
Solution Approach 1:
Instead of applying uniform compensation across the entire display, the system applies compensation selectively to specific regions or pixels affected by touch node conditions. The timing controller identifies which data signals and gate signals require compensation based on touch node location and applies compensation values only to those specific signals, reducing unnecessary processing complexity while maintaining image quality where needed
Data Source
AI summary
Disclosed herein are a touch display device capable of solving distortion of a display image due to a difference in condition between touch nodes, and a method of driving the same. The touch display device includes a panel driver configured to drive gate lines and data lines of a panel and drive and sense touch electrodes, a timing controller configured to control an operation of the panel driver, and a touch controller configured to control touch electrode driving and a sensing operation of the panel driver, wherein the timing controller compensates a display signal for a difference in condition between a touch node where a touch occurs and a touch node where a touch does not occur or a difference in physical structure between the touch nodes.