Tilt Derivation Device Using Lookup Table Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current position detection devices face challenges in accurately determining the tilt of a pen-shaped pointer due to the design of active electrostatic coupling type stylus pens, where the second electrode's detection value is small and widely distributed, making it difficult to specify its coordinate accurately, especially with noise interference.
Innovation Solution
A tilt derivation device and method that includes a sensor to detect the positions of both electrodes, a lookup table to register the correspondence between tentative slope direction tilt values and compensation values, and a control portion to calculate and derive the tilt using these values, thereby improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the second electrode is formed in a ring shape around the axis to surround the axis, then the electrode can detect a wider range of positions, but the detection value becomes small and widely distributed, making it difficult to accurately specify the detection coordinate
Solution Approach 1:
The patent introduces a lookup table as an intermediary data structure that stores pre-calculated correspondence relationships between tentative tilt values and actual tilt values. This lookup table acts as a mediator that transforms the imprecise tentative coordinate B into a more accurate tilt value by referencing pre-computed compensation data, thereby resolving the contradiction between wide detection range and measurement precision
Solution Approach 2:
The patent changes the parameter representation from direct coordinate B to a transformed parameter system involving tentative tilt values and compensation values. By storing correspondence relationships in the lookup table and using these to transform the detection data, the system achieves higher precision in tilt derivation despite the inherent imprecision in the raw detection coordinate B
2Stability of the object's composition
If the second electrode is positioned at a certain distance from the axis, then the electrode structure is stable, but the distance L between electrodes varies strictly, making tilt calculation less accurate
Solution Approach 1:
The patent performs preliminary calculations and stores compensation data in advance by creating a lookup table that contains correspondence relationships between tentative tilt values and actual tilt values. This preliminary action accounts for variations in distance L and other structural parameters, allowing the system to compensate for these variations during actual tilt measurement without requiring real-time recalculation, thus maintaining both structural stability and measurement precision
3Volume of moving object
If the detection value of the second electrode is small, then the electrode design is compact, but noise interference greatly influences the detection accuracy
Solution Approach 1:
The patent implements a feedback mechanism through the lookup table that provides compensation values based on tentative tilt measurements. The system uses the detected tentative value to retrieve a compensation value from the lookup table, which is then applied to correct the measurement. This feedback loop effectively reduces the influence of noise by comparing the tentative measurement against a database of pre-characterized responses, thereby improving detection accuracy without changing the compact electrode design
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
The solution enables precise derivation of the tilt by compensating for errors in the detection of the second electrode's coordinate, enhancing the accuracy of tilt calculations and reducing the impact of noise interference.
Implementation Method 1
a position pointed by the stylus pen 101 is detected by a sensor 100a on a position detection device 100 receiving signals transmitted by the first and second electrodes 101a and 101b which are driven by the drive power source through electrostatic coupling
Data Source
AI summary
A tilt derivation device and method for deriving a tilt of a pointer, are discussed. The pointer includes a first electrode at one end of an axis and a second electrode around the axis. The tilt derivation device includes a sensor of a plane shape configured to detect positions of the first and second electrodes; and a control portion including a lookup table in which a correspondence relationship between a tentative value of a slope direction tilt and a compensation value is registered, wherein the slope direction tilt is a tilt of the axis toward a slope direction that the axis is inclined from a normal direction perpendicular to the sensor, a slope direction tilt calculation portion calculating the tentative value based on the positions of the first and second electrodes and inputting the tentative value into the lookup table, and a tilt derivation portion deriving the tilt from the compensation value outputted from the lookup table.