Touch Detecting Display Apparatus Scanning Speed Optimization
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Solution Overview
Problem
Existing touch detection systems in display apparatuses face challenges in achieving rapid response times due to the shared use of driving signals for both display and touch detection operations, limiting the ability to increase scanning speed and resulting in user discomfort.
Innovation Solution
A touch detecting function display apparatus with multiple common driving electrodes and a scanning driving unit that performs time division scanning, allowing for separate and faster touch detection scanning by applying touch detection driving signals at a higher speed than display driving signals, while ensuring seamless overlap and prioritization of display operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the scanning speed in touch detection operation is increased to achieve rapid response, then the response speed to touch operation is improved, but the display operation cannot maintain the same scanning speed due to shared driving signals, resulting in user discomfort
Solution Approach 1:
The patent divides the common driving electrodes into multiple groups and performs touch detection scanning on different groups simultaneously during different time periods within one display scanning period. This segmentation allows touch detection to occur at higher speeds across multiple electrode groups without interfering with the overall display scanning process, thereby resolving the contradiction between rapid response and reliable detection.
2Loss of time
If the scanning speed is increased for touch detection, then the response time is reduced, but the S/N ratio of touch detection may deteriorate due to reduced integration time
Solution Approach 1:
The patent performs touch detection scanning continuously across multiple common driving electrode groups during the display scanning period. By distributing touch detection operations across multiple electrode groups simultaneously, the system maintains continuous useful action for touch detection without long idle periods, thereby reducing overall response time while preserving sufficient integration time for each individual electrode group to maintain adequate S/N ratio.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the response speed to touch operations, improving detection sensitivity and minimizing user discomfort by independently controlling display and touch detection scanning speeds.
Implementation Method 1
a capacitor is formed between the common electrode and the touch detection electrode, and the capacitance thereof is varied according to an external approaching object. The display apparatus, using this, analyzes a touch detection signal appearing at the touch detection electrode
Data Source
AI summary
A touch detecting function display apparatus includes a plurality of common driving electrodes, a display element performing display, a touch detection element detecting an external approaching object, and a scanning driving unit performing first scanning driving for sequentially applying a display driving signal to the plurality of common driving electrodes in a time division manner and second scanning driving for sequentially applying a touch detection driving signal to the plurality of common driving electrodes in a time division manner, wherein the scanning driving unit performs the second scanning driving at a scanning speed higher than that of the first scanning driving, and applies the display driving signal to an overlapping common driving electrode when the common driving electrode selected as a target of the first scanning driving overlaps with the common driving electrode selected as a target of the second scanning driving.