Infrared Camera Placement for Surface Computing Object Detection
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Solution Overview
Problem
The integration of a diffusion plate with a liquid crystal display (LCD) in surface computing systems compromises the object detection capability of infrared cameras due to diffused infrared light, while removing the diffusion plate degrades luminance uniformity and visibility.
Innovation Solution
A display system design that includes a housing member with light source units, a diffusion member, an infrared camera unit placed diagonally under the LCD, and infrared light sources to enhance both luminance uniformity and object detection capability, with the infrared camera unit positioned to minimize interference from the diffusion member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffusion plate is interposed between the backlight and the liquid crystal display to enhance luminance uniformity and visibility, then luminance uniformity is improved, but infrared light is diffused by the diffusion plate which deteriorates the object detection capability of the infrared camera
Solution Approach 1:
The patent divides the optical path into two separate channels: one for visible light (backlight through liquid crystal display) and one for infrared light (infrared camera). The diffusion plate is positioned only in the visible light path, while the infrared camera has a direct line of sight through the liquid crystal display panel, which is transparent to infrared wavelengths. This segmentation allows the diffusion plate to improve luminance uniformity without interfering with infrared object detection.
Solution Approach 2:
The patent exploits the different optical properties of the liquid crystal display panel at different wavelengths. The panel maintains its diffusion function for visible light while remaining transparent to infrared light. This local quality differentiation allows the same component (liquid crystal display panel) to serve dual functions: diffusing visible light for display purposes while allowing infrared transmission for object detection.
2Measurement precision
If the diffusion plate is removed to enhance the object detection capability of the infrared camera, then object detection capability is improved, but the luminance uniformity and visibility of the liquid crystal display panel deteriorate
Solution Approach 1:
The patent separates the functions of visible light diffusion and infrared light transmission by positioning the diffusion plate only in the visible light path. The infrared camera is arranged to receive infrared light directly through the liquid crystal display panel without passing through the diffusion plate, thus maintaining both luminance uniformity for display and object detection capability.
Solution Approach 2:
The liquid crystal display panel acts as an intermediary that differentially transmits visible and infrared light. It allows the diffusion plate to modify visible light for display purposes while remaining transparent to infrared wavelengths, enabling the infrared camera to detect objects without the diffusion plate interfering with the infrared optical path.
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 system achieves improved luminance uniformity and object detection capability by strategically placing the infrared camera and light sources, maintaining high visibility and detection performance without compromising on either aspect.
Implementation Method 1
a diffusion member which is disposed on the light source units
Implementation Method 2
a plurality of infrared light sources which emit infrared light to the front region of the liquid crystal display panel
Implementation Method 3
an infrared camera unit which is interposed between the liquid crystal display panel and the diffusion member and photograph a front region of the liquid crystal display panel
Data Source
AI summary
A display system includes a housing member which has space therein, a plurality of light source units which are placed in the space, a diffusion member which is disposed on the light source units, a liquid crystal display panel which is disposed on the diffusion member, an infrared camera unit which is interposed between the liquid crystal display panel and the diffusion member and photograph a front region of the liquid crystal display panel, and a plurality of infrared light sources which emit infrared light to the front region of the liquid crystal display panel.