Touch Display Screen Frame Rate Control for Charging Time
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Solution Overview
Problem
Current touch display screen technologies face insufficient charging time due to time division driving methods, which compromise display quality and increase power consumption when trying to multiplex displaying and touch detecting functions.
Innovation Solution
Implementing a touch detection method with a time division control and frequency modulation control, where the touch display screen is scanned in phases - partially during a touch scanning phase and fully when a touch signal is detected, reducing the frame rate to ensure adequate charging time without affecting the touch detecting operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If time division driving is used to multiplex displaying and touch detecting functions, then both functions can be provided, but charging time of the panel is insufficient resulting in inadequate display effects
Solution Approach 1:
The patent dynamically adjusts the frame rate of the display based on touch detection needs. When touch events occur, the system switches to a lower frame rate (e.g., from 60Hz to 30Hz) to allocate more time for touch scanning operations. This dynamic adjustment ensures that both displaying and touch detecting functions can be performed adequately without compromising charging time of the panel.
Solution Approach 2:
The patent implements periodic touch scanning within the display frame structure by utilizing the horizontal blanking period (H-Blank) and vertical blanking period (V-Blank). Touch detection is performed periodically during these blanking intervals without interrupting the normal display refresh cycle, allowing multiplexing of functions while maintaining adequate charging time.
2Ease of operation
If H-Blank is shortened and V-Blank is prolonged to enable time division multiplexing, then touch detecting function can be performed, but charging time cannot be guaranteed
Solution Approach 1:
The patent performs touch detection during the horizontal and vertical blanking periods before the actual display refresh begins. By utilizing these pre-allocated time intervals for touch scanning, the system ensures that touch detection is completed before charging and display operations start, thus guaranteeing adequate charging time while maintaining touch functionality.
3Adaptability or versatility
If time division driving is implemented to achieve both functions, then multiplexing is enabled, but power consumption is increased
Solution Approach 1:
The patent dynamically adjusts the frame rate based on whether touch events are detected. When no touch events occur, the display operates at normal frame rate (e.g., 60Hz). When touch events are detected, the frame rate is reduced (e.g., to 30Hz) to decrease power consumption during touch scanning operations, thus reducing overall power consumption while maintaining both functions.
Data Source
AI summary
The disclosure provides a touch detection method and apparatus for a touch display screen, wherein a time period for scanning the touch display screen within each frame comprises a display scanning phase and a touch scanning phase, the method comprising: scanning a part of the touch display screen during the touch scanning phase to detect whether there is a touch signal; and reducing a frame rate of the touch display screen and scanning the whole touch display screen when the touch signal is detected. Accordingly, the charging time of the panel is guaranteed while displaying and touch detecting functions are multiplexed.