Optical Whiteboard Touch Sensing for Precise Multi-Point Handwriting
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Solution Overview
Problem
Existing electronic whiteboards face limitations in accurately determining touch coordinates due to the physical size of light emitting and receiving elements, leading to incomplete writing recognition and interference among light beams, which affects multi-point input precision.
Innovation Solution
An electronic whiteboard with a light processing unit that includes a light transmitting unit with multiple light emitting elements and a light receiving unit with optical path converters, such as prism sheets, to process the variance of light paths and amounts, using different wavelengths and phases to improve touch coordinate determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the physical size of light emitting and receiving elements is reduced to improve touch coordinate determination accuracy, then measurement precision improves, but the area where light beam cannot be transmitted increases leading to incomplete writing recognition
Solution Approach 1:
The patent divides the light beam path into multiple segments by introducing intermediate light receiving elements between the light emitting element and the main light receiving sensor. This segmentation allows the system to detect light beams at multiple points, thereby reducing the unrecognized area while maintaining measurement precision through coordinated processing of signals from multiple segments.
Solution Approach 2:
The patent transitions from a one-dimensional light beam detection approach to a two-dimensional detection system by arranging light receiving elements in both horizontal and vertical directions. This dimensional expansion creates multiple detection paths that cover a larger area, solving the problem of incomplete writing recognition while maintaining coordinate accuracy through multi-dimensional coordinate calculation.
2Adaptability or versatility
If multiple light beams are used to improve multi-point input capability, then adaptability improves, but interference among light beams increases affecting precision
Solution Approach 1:
The patent implements a feedback mechanism where the control unit receives light beam signals from multiple light receiving elements, processes the coordinated light beam amounts, and calculates touch coordinates based on the feedback from multiple detection points. This feedback system allows the device to distinguish between interfering light beams by analyzing the spatial distribution and intensity patterns, thereby maintaining measurement precision while supporting multi-point input.
Solution Approach 2:
The patent utilizes parameter changes in light beam characteristics, specifically the intensity (light beam amount) and position, to differentiate between multiple light beams. By measuring the light beam amount at multiple detection points and analyzing the spatial distribution parameters, the system can accurately determine touch coordinates even when multiple light beams are present, thus maintaining precision while enhancing multi-point input capability.
3Productivity
If light beam sensing sensors are densely disposed to improve writing recognition rate, then productivity improves, but device complexity increases
Solution Approach 1:
The patent makes the light receiving elements serve multiple functions: they act as both intermediate detection points for expanding the recognition area and as coordinate determination sensors. The same light receiving elements are used for both area coverage and precision measurement, eliminating the need for separate dense sensor arrangements and thus improving writing recognition rate without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the functions of light emitting elements, intermediate light receiving elements, and main detection sensors into a coordinated system. By combining these elements into an integrated light processing unit with unified control, the system achieves high writing recognition rates through collaborative detection while managing complexity through functional integration and centralized signal processing.
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
Enhances touch recognition accuracy by reducing determination errors and compensating for interference, allowing precise identification of touch coordinates and natural handwriting implementation.
Implementation Method 1
an optical path converter which is installed on a front surface portion of the light emitting element to convert a direction of a light beam emitted from the light emitting element
Implementation Method 2
an optical path converter which is installed on a front surface portion of the light emitting element to convert a direction of a light beam emitted from the light emitting element
Implementation Method 3
a light receiving unit including a plurality of sensing optical sensors which is installed in a position corresponding to the light transmitting unit to receive a light beam emitted from the light emitting elements
Data Source
AI summary
Disclosed is an electronic whiteboard which improves writing recognition of an optical touch panel and an operating method thereof and an object is to provide an optical electronic whiteboard which precisely identifies an object and a touch position of the object by overcoming a physical limit such as a size of a light emitting element on a touch screen which uses a light beam touch panel and an operating method thereof.