Circular Coil Layout for Accurate Position Detection on Round Screens
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing position detection sensors for circular display screens are inefficient due to wasted sensor area outside the inscribed circle, and existing joysticks using electromagnetic induction type sensors lack accuracy in directional input.
Innovation Solution
A circular position detection sensor with loop coils arranged in intersecting directions on a circular substrate, including straight and circumferential portions along the edge, connected to a position detection circuitry for accurate position detection and pen pressure sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a rectangular position detection sensor is used for a circular display screen, then the position detection can cover the entire circular area, but the sensor area outside the inscribed circle is wasteful and not used for position detection
Solution Approach 1:
The patent applies spheroidality by configuring the position detection sensor with a circular shape instead of a rectangular shape. The sensor includes a circular substrate with loop coils arranged in a circular pattern, allowing the sensor area to perfectly match the circular display screen area and eliminate wasted sensor area outside the inscribed circle.
2Shape
If sensor electrodes are shaped to correspond to curved corners of a display screen, then the detection area matches the screen shape, but the sensor becomes complex to manufacture
Solution Approach 1:
The patent segments the sensor into a modular structure consisting of a circular substrate and multiple loop coils arranged in a circular pattern. Each loop coil is formed by connecting straight portions and circumferential portions, creating a standardized modular unit that is easier to manufacture than custom-shaped electrodes while still achieving the desired circular detection area.
3Area of stationary object
If a circular position detection sensor is implemented, then sensor area utilization is optimized for circular screens, but the coil arrangement becomes more complex to achieve accurate position detection
Solution Approach 1:
The patent introduces asymmetry into the circular coil design by incorporating both straight portions and circumferential portions in each loop coil. This asymmetric configuration within the symmetric circular arrangement enables accurate position detection while maintaining the optimized circular sensor area, balancing geometric simplicity with functional complexity.
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 high-accuracy position detection and directional input on circular screens, optimizing sensor area utilization and enhancing joystick functionality.
Implementation Method 1
A position detection sensor of an electromagnetic induction type connected to a position detection circuitry is provided
Implementation Method 2
the position detection sensor includes a circular substrate, a plurality of first loop coils arranged in a first direction on the circular substrate, and a plurality of second loop coils arranged in a second direction intersecting the first direction on the circular substrate
Data Source
AI summary
The present disclosure is directed to a position detection sensor of an electromagnetic induction type connected to a position detection circuitry. The position detection sensor includes a circular substrate, a plurality of first loop coils arranged in a first direction on the circular substrate, and a plurality of second loop coils arranged in a second direction on the circular substrate, the second direction intersecting the first direction. Each of the plurality of first loop coils includes a straight portion extending in the second direction and a circumferential portion disposed along an outer edge of the circular substrate, and each of the plurality of second loop coils includes a straight portion extending in the first direction and a circumferential portion disposed along the outer edge of the circular substrate.