Touch Sensor Report Interval Control for Variable Display Refresh
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Solution Overview
Problem
Existing multimedia devices face challenges in efficiently managing touch input detection and image display, particularly when switching between different driving frequencies, leading to inefficiencies in touch signal processing and coordinate calculation.
Innovation Solution
The electronic device employs a sensor layer with a variable report interval, utilizing first and second driving frequencies, and a controller that adjusts the report interval based on vertical synchronization signals, distributing touch signals across valid and blank periods to optimize touch signal processing and coordinate calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor layer operates at a fixed high report interval frequency, then touch input detection accuracy is improved, but power consumption increases and compatibility with variable display refresh rates deteriorates
Solution Approach 1:
The report interval is made dynamic rather than fixed. The controller adjusts the report interval based on the current driving frequency of the display layer, allowing the sensor layer to operate at optimal intervals for different refresh rates. This dynamic adjustment enables the system to maintain high touch detection accuracy when needed while reducing power consumption during low-activity or low-refresh-rate modes.
Solution Approach 2:
The system changes the temporal parameter (report interval) of the sensor layer based on the display layer's driving frequency. When the display operates at higher refresh rates, the sensor report interval is shortened to maintain synchronization and accuracy. When the display refresh rate is reduced, the sensor report interval is extended to reduce power consumption, thus adapting to different operating conditions.
2Device complexity
If the sensor layer uses a fixed report interval, then signal processing simplicity is maintained, but adaptability to different driving frequencies deteriorates
Solution Approach 1:
The report interval is dynamically adjusted based on the detected driving frequency. The controller monitors the vertical synchronization signal to determine the current refresh rate and automatically modifies the sensor layer's report interval accordingly. This maintains simplicity in the base design while adding adaptability through frequency-based adjustment.
Solution Approach 2:
The system uses feedback from the vertical synchronization signal to adjust the report interval. The controller detects the driving frequency through the VSYNC signal and uses this information to configure the sensor layer's reporting behavior, creating a closed-loop system that adapts to changing display conditions.
3Stability of the object's composition
If touch signals are processed during the valid period only, then display synchronization is maintained, but touch signal processing efficiency deteriorates
Solution Approach 1:
The system uses the periodic structure of the display frame (valid period and blank period) to optimize touch signal processing. Touch signals are transmitted during the valid period to maintain synchronization, while the blank period is utilized for additional processing tasks or reduced-activity sensing, effectively using both periods productively.
Solution Approach 2:
The controller prepares and transmits touch signals in advance during the valid period, and uses the blank period for subsequent processing or anticipation of next-frame requirements. This preliminary action during the valid period ensures synchronization while the blank period provides additional processing time.
Data Source
AI summary
An electronic device includes a display layer driven at a driving frequency that includes a first driving frequency and a second driving frequency that is smaller than the first driving frequency. The display layer displays an image in a unit of frame A sensor layer is driven in a unit of a report interval in which a first touch signal is provided. A display driver generates a vertical synchronization signal and controls a display layer. A controller controls the sensor layer. The controller calculates the driving frequency of the display layer based on the vertical synchronization signal and changes a cycle of the report interval based on the driving frequency. The controller provides a plurality of the first touch signals to the report interval when the driving frequency is changed from the first driving frequency to the second driving frequency.