Light Guide Film Position Detection System
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Solution Overview
Problem
Conventional touch control panels, including capacitive, resistive, and optical types, face issues with incorrect input due to user interference, and digital pens with built-in light sources are expensive and difficult to apply to normal screens, requiring micro codes printed on objects.
Innovation Solution
A position detecting system utilizing a light guide or film with a light emitting-out side that provides position information, allowing a transceiver to determine relative position without a built-in light source, enabling lower consumption and compatibility with various displays and light emitting apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a digital pen with built-in light source is used for position detection, then position information can be transmitted, but the cost increases and the device becomes complex
Solution Approach 1:
The light source function is extracted from the transceiver and relocated to the display device itself. The display device's existing light source is utilized to illuminate position information regions on the light guide, eliminating the need for a separate light source in the transceiver.
Solution Approach 2:
The display device's light source serves dual purposes: displaying visual content and providing illumination for position information transmission. This multi-functional approach eliminates redundant components and reduces overall system complexity.
2Measurement precision
If micro codes are printed on objects for digital pen recognition, then position information can be identified, but the manufacturing process becomes complex and costly
Solution Approach 1:
Position information is encoded using regions with different light transmission characteristics rather than printed micro codes. These regions can be formed through material properties or structural variations in the light guide, eliminating the need for complex printing processes.
Solution Approach 2:
Position information is optically encoded through the light guide's structure and material properties rather than requiring physical printing of micro codes. The position data is copied into the light transmission pattern itself.
3Use of energy by moving object
If the transceiver has no built-in light source, then energy consumption is reduced, but the ability to provide position information may be compromised
Solution Approach 1:
The system utilizes the display device's existing light source to illuminate the position information regions. The light guide itself serves as the information carrier, reflecting and transmitting light patterns that encode position data without requiring active illumination from the transceiver.
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
Enables accurate position detection without additional light sources on the transceiver, reducing costs and expanding applicability to different electronic devices and displays.
Implementation Method 1
a light guide, having a light receiving side, to receive light from a light source; and a light emitting-out side
Implementation Method 2
light has position information from the position information region when the light emits out from at least part of the light emitting-out side
Data Source
AI summary
A position detecting system with a position information providing apparatus, a transceiver, and a processor. The position information providing apparatus comprises a light emitting-out side having at least one position information region distributed on an outer surface of the light emitting-out side. The position information region comprises materials which are distributed on the outer surface and provide the position information. The light has position information from the position information region when the light emits out from at least part of the light emitting-out side. The transceiver receives the light with the position information. The processor determines a relative position between the transceiver and the position information providing apparatus according to the position information received by the transceiver.