Light Guide Part Segmentation for Uniform Touch Sensing
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Solution Overview
Problem
Touch sensing apparatuses face challenges in simplifying their structure and reducing manufacturing costs while maintaining effective multi-touch detection capabilities.
Innovation Solution
The implementation of a light detecting type touch sensing apparatus with a light guide part that distributes light from a single or few light sources to a light sensing part, allowing for the calculation of touch coordinates through variations in light intensity, thereby reducing the number of required light sources and simplifying the apparatus structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are used to illuminate the entire touch sensing area, then uniform light distribution is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent segments the light distribution function by introducing a light guide part with multiple light guide patterns. These patterns divide and redirect light from a single source into multiple paths, achieving uniform illumination across the touch sensing area without requiring multiple light sources. Each light guide pattern acts as an independent light distribution channel.
Solution Approach 2:
The light guide part serves as an intermediary component between the single light source and the light sensing part. It mediates the light distribution by capturing light from the source, processing it through multiple light guide patterns, and delivering uniformly distributed light to the sensing area, thereby eliminating the need for multiple direct light sources.
2Adaptability or versatility
If multiple light sources are used to detect multi-touches, then detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The light guide part is segmented into multiple light guide patterns that independently guide light to different regions of the light sensing part. This segmentation enables the system to detect multiple touch points simultaneously by monitoring light intensity variations in different regions, achieving multi-touch detection with a single light source.
Solution Approach 2:
A single light source combined with the light guide part performs multiple functions: it illuminates the entire touch sensing area uniformly and enables multi-touch detection across different regions. The light guide patterns ensure that one light source can serve multiple detection zones, reducing component count and manufacturing cost.
3Manufacturing precision
If a complex light distribution system is used to guide light from multiple sources, then light distribution precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the light distribution function from the light sources themselves and transfers it to a dedicated light guide part. This separation allows the light sources to remain simple while the light guide part handles the complex distribution task through its patterns, simplifying the overall system architecture.
Solution Approach 2:
Different regions of the light guide part have different light guide patterns optimized for their specific locations. This local customization of light distribution patterns ensures precise light delivery to corresponding regions of the light sensing part, achieving high distribution precision without requiring a uniformly complex structure throughout.
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 solution enables efficient detection of multi-touches with a simplified structure and reduced manufacturing costs, ensuring accurate coordinate calculation and uniform light distribution across the touch sensing area.
Implementation Method 1
a light guide part that guides the light from the light source to the light distribution part
Implementation Method 2
The light reflection part defines the light guide part in association with the light guide part and the light sensing part and reflects the light to the light distribution part
Implementation Method 3
The light sensing part receives the light provided through the light guide part and the light distribution part from the light source and outputs an output signal corresponding to an amount of the light varied
Data Source
AI summary
A touch sensing apparatus includes a light source generating a light. The light travels though a light distribution part. A light guide part guides the light to the light distribution part. A light sensing part outputs an output signal corresponding to an intensity of the light incident through the light guide part and the light distribution part when a touch occurs. A light reflection part reflects the light provided to the light distribution part, and a coordinate generating part calculates a coordinate value of the touch using the output signal from the light sensing part.