Position Detecting Device Coordinate Mapping
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Solution Overview
Problem
Conventional position detecting devices, such as tablets, face challenges when the input surface and display screen are not congruent or similar in size and aspect ratio, leading to distorted display images and reduced usability, especially when trying to input information on a part of the display screen.
Innovation Solution
A miniaturized position detecting device that includes a sensor with first and second electrodes arranged in intersecting directions, an input surface, and circuits to detect absolute coordinates, calculate relative coordinates, and output absolute coordinate values, allowing for seamless interaction without the need for a dedicated driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the whole input surface is associated with the whole display screen, then the tablet can be used with HID-compliant standard drivers, but display distortion occurs when the input surface and display screen are not congruent or similar
Solution Approach 1:
The patent divides the display screen into multiple regions and associates different portions of the input surface with different display regions. This segmentation allows the input surface to be mapped to specific areas of the display screen without requiring the entire surfaces to be congruent, thereby preventing display distortion while maintaining HID-compliant driver compatibility.
Solution Approach 2:
The patent changes the mapping parameters between the input surface and display screen by allowing flexible association rules. Instead of requiring a fixed one-to-one correspondence between congruent surfaces, the system adjusts mapping parameters to accommodate different size and aspect ratio configurations, resolving the contradiction between driver compatibility and display accuracy.
2Area of stationary object
If the input surface is made smaller to fit desktop space, then device size is reduced, but the ability to input information on a part of the display screen is limited
Solution Approach 1:
The patent implements dynamic association between the input surface and display screen regions. The association can be changed based on user needs, allowing a small input surface to flexibly map to different portions of the display screen. This dynamic mapping enables the tablet to adapt to various input scenarios despite its compact size.
Solution Approach 2:
The patent makes the input surface multi-functional by allowing it to associate with different display screen regions for different purposes. A single small input surface can serve multiple functions by dynamically mapping to various display areas, thereby maintaining input flexibility and versatility despite the reduced physical size.
3Measurement precision
If absolute coordinates are used for position detection, then the position can be accurately detected, but the indicated position does not match the user's expectation when the input surface and display screen are not congruent or similar
Solution Approach 1:
The patent introduces an intermediary mapping layer between the absolute coordinate detection and the final position indication. This intermediary layer transforms the absolute coordinates according to the specific association rules between input surface and display regions, ensuring that the indicated position matches user expectations while preserving the accuracy of the underlying absolute coordinate detection.
Data Source
AI summary
A position detecting circuit detects an indicated position on an input surface of a sensor as absolute coordinates. A relative coordinate calculating circuit which, in operation, sequentially obtains the absolute coordinates from the position detecting circuit and calculates relative coordinates indicating the position indicated by an indicator on the input surface, from a difference between previous absolute coordinates and present absolute coordinates. An output absolute coordinate value calculating circuit which, in operation, assumes that an indication input is performed on an input area positioned on an output absolute coordinate region corresponding to a display screen, and calculates an output absolute coordinate value of the indicated position corresponding to the indication input by using the relative coordinates from the relative coordinate calculating circuit. The calculated output absolute coordinate value is output through an output circuit.