Optical Touch Detection with Dual-Layer Segmentation
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Solution Overview
Problem
Existing touch panels in automatic vending machines are prone to false operations due to the lack of multi-stage detection, which can lead to erroneous selections when an operating unit touches the screen.
Innovation Solution
An optical operating input detection apparatus using two detection layers, where the first detection layer extends parallel to the display area surface and the second detection layer is positioned between the display area and the first layer, with an operation determination unit that analyzes images from both layers to accurately determine the operating unit's input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single detection layer is used to detect touch input, then the device complexity is reduced, but false operations occur due to inability to distinguish between intentional touch and accidental contact
Solution Approach 1:
The detection system is divided into two separate detection layers: a first detection layer for detecting contact position and a second detection layer for detecting touch pressure. This segmentation allows the system to distinguish between intentional touch (both layers activated) and accidental contact (only first layer activated), thereby improving reliability while maintaining manageable complexity through functional division.
Solution Approach 2:
The invention adds a vertical dimension to touch detection by stacking detection layers at different depths (first detection layer closer to display surface, second detection layer deeper). This multi-dimensional approach enables differentiation of touch intensity and type by detecting which layers are activated, resolving the contradiction between simplicity and accuracy.
2Measurement precision
If multi-stage detection is implemented to prevent false operations, then the accuracy of selection is improved, but the device complexity increases
Solution Approach 1:
The invention replaces complex mechanical multi-stage detection mechanisms with an optical detection system using light-emitting units and photodetectors arranged in multiple layers. This substitution achieves high measurement precision through optical signal detection while avoiding the mechanical complexity of traditional multi-stage systems.
Solution Approach 2:
The detection layers serve multiple functions: the first detection layer detects contact position, the second detection layer detects touch pressure, and together they distinguish between intentional touch and accidental contact. This multi-functionality within a unified structure improves precision without proportionally increasing 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
This solution effectively reduces false operations by providing a two-stage detection mechanism, allowing for precise identification of the operating unit's position and action, thereby enhancing the accuracy of selections on the touch panel.
Implementation Method 1
The optical sensor emits and receives light
Implementation Method 2
a thin retroreflector frame on the other edge of the detection area
Implementation Method 3
The detection unit receives the radiated light and converts the radiated light to a corresponding electric signal
Data Source
AI summary
An optical operating input detection apparatus includes: a detection unit configured to optically detect an operating input by the operating unit on respective first and second detection layers, the first detection layer extending in parallel with a display area surface on the display panel to be spaced a predetermined distance away from the display area surface and having a surface area including the display area surface, the second detection layer being disposed between the display area surface and the first detection layer and having a surface area identical to the surface area of the first detection layer; and an operation determination unit configured to determine operating detail of the operating unit based on a detected image on the respective first and second detection layers.