Coordinate Recognition Using Multi-Directional Light Path Arrays
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Solution Overview
Problem
Conventional optical coordinate recognition apparatuses face limitations in achieving high precision due to the low resolution of light paths formed between infrared light-emitting and receiving devices, which restricts the accuracy of identifying manipulation positions.
Innovation Solution
The apparatus employs a configuration of light-emitting and receiving devices arranged in arrays with varying angles of light paths, allowing for precise identification of positions by forming groups of parallel light paths and using a controller to calculate coordinates based on transmittance data, enabling high-precision recognition of touch manipulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of light-emitting devices and light-receiving devices is increased to improve resolution, then measurement precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the coordinate recognition function into multiple scanning directions (first direction and second direction perpendicular to the first). Instead of using a dense grid of light-emitting and light-receiving devices, it segments the detection into sequential one-dimensional scans along different directions, reducing the total number of devices required while maintaining recognition precision.
Solution Approach 2:
The patent employs periodic scanning actions where light-emitting devices and light-receiving devices are selectively activated in sequences along different directions. By periodically scanning along the first direction, then the second direction, and repeating this cycle, the system achieves comprehensive coordinate recognition with fewer devices than a static dense array would require.
2Measurement precision
If the distance between light paths is narrowed to improve resolution, then measurement precision is improved, but device complexity increases due to size restrictions
Solution Approach 1:
The patent transitions from a single-direction two-dimensional device arrangement to a multi-directional scanning approach. By adding the dimension of temporal sequencing and directional scanning, the system achieves finer effective resolution without physically narrowing the distance between devices. The perpendicular scanning directions create a virtual denser sampling grid through coordinate calculation rather than physical device density.
3Measurement precision
If multiple light-emitting devices and light-receiving devices are used to improve precision, then measurement precision is improved, but the apparatus size increases
Solution Approach 1:
The patent makes the light-emitting devices and light-receiving devices multi-functional by using them in multiple scanning directions. Each device serves multiple purposes: detecting light paths in its own direction and contributing to coordinate calculation when combined with detections from perpendicular scanning directions. This universality reduces the total number of devices needed compared to dedicated detectors for each measurement axis.
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
This configuration enhances the precision of identifying manipulation positions, allowing for accurate detection of touch inputs with reduced errors, even when multiple light shield regions are involved, thereby improving the overall accuracy of coordinate recognition.
Implementation Method 1
a plurality of light-emitting devices Lx1 to Lx12, Ly1 to Ly9 arranged in arrays
Implementation Method 2
a plurality of light-receiving devices Px1 to Px12, Py1 to Py9 arranged in arrays parallel to the arrays of the light-emitting devices
Data Source
AI summary
According to one embodiment, a coordinate recognition apparatus includes a plurality of light-emitting devices, a plurality of light-receiving devices, and a controller. The light-emitting devices and the light-receiving devices are arranged in an array along X direction. The controller forms a plurality of groups of light paths each formed by a plurality of light paths parallel to one another in a plane including the light-emitting devices and the light-receiving devices such that an angle of the light paths varies from group to group, identifies positions p and l of each of the groups in the X direction of the light-emitting device and the light-receiving device corresponding to the light path that passes through the center of a light shield region, and calculates coordinates of the center of the light shield region in the plane based on the identified positions p and l of each of the groups.