Adaptive Touch Display Timing Control for In-Cell Sensing
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Solution Overview
Problem
Advanced In-Cell Touch (AIT) display devices face a trade-off between data writing and touch sensing periods, leading to reduced display performance due to insufficient data charging time, as the ratio of these periods is fixed and difficult to adjust with increasing scan lines.
Innovation Solution
A touch display device that adaptively controls touch sensing and data writing periods for each area by using a timing controller to time-divide each frame into unit periods, where the touched area has a longer touch sensing period and the untouched area has a longer data writing period, allowing for dynamic adjustment based on touch occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensing period is extended to improve touch sensing performance, then the data writing period is reduced, leading to insufficient data charging time and deteriorated display performance
Solution Approach 1:
The display panel is divided into multiple pixel blocks, and the frame period is divided into multiple data writing periods corresponding to different pixel blocks. This segmentation allows the system to perform touch sensing operations on certain blocks while simultaneously performing data writing on other blocks, thereby resolving the conflict between touch sensing time and data charging time.
Solution Approach 2:
The patent implements dynamic allocation of data writing periods and touch sensing periods based on real-time touch detection. When touch is detected in a particular area, the system dynamically adjusts to perform touch sensing on that area while maintaining data writing operations on other areas, creating a flexible and adaptive timing structure rather than a fixed trade-off.
2Manufacturing precision
If the number of scan lines is increased to improve display definition, then the data writing period must be extended, but this reduces the touch sensing period available
Solution Approach 1:
By dividing the pixel array into multiple pixel blocks that can be scanned in parallel or sequential segments, the system can maintain high definition (more scan lines) while distributing the data writing operation across multiple time segments. This allows touch sensing to occur during data writing operations on other blocks, preventing the touch sensing period from being reduced.
3Device complexity
If the ratio of data writing periods to touch sensing periods is fixed by touch synchronization signal, then system control is simplified, but adaptability to different touch scenarios is reduced
Solution Approach 1:
The system maintains a fixed basic structure for timing control but introduces dynamic adjustment capabilities within that structure. The timing controller can adaptively allocate time periods between data writing and touch sensing based on actual touch conditions, allowing the system to respond to different touch scenarios while maintaining overall control structure integrity.
Solution Approach 2:
The patent enables dynamic modification of timing parameters (data writing period duration, touch sensing period duration, and their allocation ratios) based on touch detection results. This allows the system to adapt to different touch scenarios by changing operational parameters without fundamentally altering the control architecture.
Data Source
AI summary
The present disclosure relates to a touch display device capable of adaptively controlling a touch sensing period and a data writing period for each area according to whether touch has occurred. A timing controller in a touch display device time-divides each frame into a plurality of unit periods using a touch synchronization signal, time-divides each unit period into a data writing period in which one of a plurality of pixel blocks of a pixel array is scanned and a touch sensing period in which one of a plurality of touch blocks of a touch electrode array is scanned, receives touch coordinate information from an MCU, defines a panel as a touched area and an untouched area, and controls a first touch sensing period in which the touched area is scanned to increase to be longer than a second touch sensing period in which the untouched area is scanned.