Touch Panel Input Device with Area-Specific Detection Control
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Solution Overview
Problem
Touch panel input devices with large display panels face increased power consumption due to both the display panel and touch position detection mechanisms, with existing solutions only reducing power consumption of the display panel but not the detection mechanism, especially as display sizes and resolutions increase.
Innovation Solution
A touch panel input device that includes a display panel with a touch position detection mechanism using a detection system with light-emission and light-reception elements, where the detection mechanism is controlled to only activate over specific areas of the display surface corresponding to button images, reducing power consumption by deactivating detection in non-essential areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel size is increased to improve visual perceptibility and usability, then the display quality is improved, but the power consumption of both the display panel and touch position detection mechanism increases
Solution Approach 1:
The display surface is divided into multiple detection regions corresponding to different button images. The touch position detection mechanism performs detection only in the region where a button image is displayed, rather than across the entire display surface. This segmentation allows the system to maintain large display sizes for improved visual perceptibility while reducing power consumption by activating detection only in necessary areas.
2Reliability
If the touch position detection mechanism is activated across the entire display surface to ensure complete touch detection, then detection coverage is improved, but power consumption increases
Solution Approach 1:
Different regions of the display surface are assigned different detection states based on their functional requirements. Regions displaying button images are set to detection-on state with appropriate sensitivity, while regions without button images are set to detection-off state. This local quality approach ensures reliable touch detection where needed while minimizing power consumption in non-essential areas.
3Measurement precision
If the touch position detection mechanism operates at high sensitivity across the entire display to accurately detect all touch positions, then detection precision is improved, but power consumption increases
Solution Approach 1:
The detection sensitivity and activation state of the touch position detection mechanism are dynamically adjusted based on the displayed content. When a button image is displayed in a particular region, the detection mechanism activates with appropriate sensitivity in that region. When no button image is displayed, detection is deactivated or reduced. This dynamic adjustment maintains high detection precision for interactive elements while reducing overall power consumption.
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 effectively reduces overall power consumption of the touch panel input device by selectively activating the touch position detection mechanism only where necessary, thereby extending battery life and reducing energy usage without compromising user interaction.
Implementation Method 1
a touch position detection mechanism that detects a touch position on the display surface by detecting light emitted from light-emission elements and received by light-reception elements
Data Source
AI summary
Touch panel input device including: display panel having display surface; display controller causing display of button image on the display surface, the button image used for receiving touch operation performed by user; touch position detector detecting touch position of the display surface by detecting X and Y coordinates on X-Y rectangular coordinate system; area specifier specifying first area and second area of the display surface, the first area being area at which the button image is to be displayed, the second area being remaining area of display surface; and detection instructor referring to result of the specification by the area specifier and instructing the touch position detector (i) to perform touch position detection with respect to an area corresponding to the first area and (ii) to put in off state touch position detection with respect to an area corresponding to at least a part of the second area.