Photosensor Incident Angle Segmentation for Contactless Positioning
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Solution Overview
Problem
Conventional touchscreen devices with CMOS sensors have a narrow detectable area and uneven distribution, making it difficult to obtain accurate positional data without contact, which can lead to user inconvenience and surface deterioration.
Innovation Solution
A solid-state image sensing device with a plurality of photosensors having varying incident angles, allowing light to be detected from different directions, thereby expanding the detectable area and improving positional data accuracy without contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the incident angle range of light incident on each photosensor is widened to expand the detectable area, then the detectable area is expanded, but light with low directivity is received resulting in misalignment between detected position and actual position
Solution Approach 1:
The photosensor array is divided into multiple independently controllable photosensors with different incident angle characteristics. Each photosensor can be selectively activated based on the incident angle of incoming light, allowing the system to segment the detection task by angle ranges to maintain both wide coverage and high precision
Solution Approach 2:
The system dynamically selects which photosensors to activate based on the incident angle of incoming light. By controlling the on/off state of individual photosensors according to light incident angles, the system adapts to different detection scenarios, maintaining positional accuracy while expanding the effective detectable area
2Adaptability or versatility
If photosensors are arranged in two dimensions to obtain three-dimensional image data, then three-dimensional imaging capability is achieved, but the detectable area becomes narrow and unevenly distributed
Solution Approach 1:
Different regions of the photosensor array are assigned different incident angle characteristics. Photosensors at different positions have optimized incident angles suited for their local detection needs, creating non-uniform incident angle distribution that compensates for the geometric limitations of two-dimensional arrangement and achieves uniform detectable area coverage
Solution Approach 2:
The system introduces incident angle as an additional dimensional parameter beyond the standard two-dimensional sensor array coordinates. By controlling light incident angles in addition to spatial position, the system effectively adds a third degree of freedom for detection, enabling three-dimensional imaging while maintaining uniform detectable area distribution
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
The solution provides a wide detectable area with reduced unevenness, enabling accurate and contact-free positional data acquisition, enhancing user experience and reducing surface wear.
Implementation Method 1
Light with a first incident angle enters a plurality of first photosensors from a first incident direction. Light with a second incident angle enters a plurality of second photosensors from a second incident direction different from the first incident direction.
Data Source
AI summary
To provide a solid-state image sensing device or a semiconductor display device, which can easily obtain the positional data of an object without contact. Included are a plurality of first photosensors on which light with a first incident angle is incident from a first incident direction and a plurality of second photosensors on which light with a second incident angle is incident from a second incident direction. The first incident angle of light incident on one of the plurality of first photosensors is larger than that of light incident on one of the other first photosensors. The second incident angle of light incident on one of the plurality of second photosensors is larger than that of light incident on one of the other second photosensors.