Optical Property Sensing Behind Displays for Compact Spectral Measurement
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Solution Overview
Problem
Existing methods for measuring the optical properties of translucent materials face challenges in capturing all reflected light due to diffuse scattering, leading to spectral information loss and requiring large setups or inefficient energy use.
Innovation Solution
A method using a display screen with a non-zero transmission function to illuminate the target, allowing contact measurement with a sensor positioned behind the screen to capture reflected light, enabling small illumination areas and accurate optical property determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a small illumination area is used on the target, then spectral information loss is reduced, but the measurement setup becomes impractically large
Solution Approach 1:
The sensor is positioned behind the display screen, nesting the detection component within the illumination device structure. This allows the sensor to capture scattered light from a small illumination area without requiring a large separation distance, effectively nesting the measurement function within the display assembly itself.
Solution Approach 2:
The display screen acts as an intermediary between the light source and the target. By using the display's transmission function, the system achieves effective illumination with a small area while the sensor positioned behind the display can capture the scattered light, mediating the optical path to avoid the need for large setup dimensions.
2Measurement precision
If a large illumination area is used on the target, then complete spectra can be captured, but energy efficiency decreases and setup complexity increases
Solution Approach 1:
The illumination is concentrated in a small, localized area on the target rather than spreading over a large area. The display screen's transmission function allows this localized illumination to still provide complete spectral information when viewed from the sensor position behind the display, achieving spectral completeness with localized energy input.
Solution Approach 2:
The system changes the optical parameters by utilizing the display screen's transmission function and positioning the sensor behind it. This parameter change allows the use of a small illumination area while still capturing complete spectra, as the transmission characteristics of the display modify the light path and distribution.
3Measurement precision
If the sensor is positioned far from the target, then all scattered light can be captured, but the device configuration becomes large and complex
Solution Approach 1:
The illumination device (display screen) and the sensor are merged into a single integrated configuration. The sensor is positioned behind the display screen, combining the illumination and detection functions in one compact unit, eliminating the need for separate positioning of light source and sensor at large distances from the target.
Solution Approach 2:
The sensor is positioned in a different spatial dimension (behind the display screen) rather than at a large distance in front of the target. This dimensional change allows the sensor to capture scattered light effectively while maintaining a compact overall configuration, as the light path utilizes the transmission through the display from the rear.
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 approach reduces setup size, simplifies measurement configurations, and allows for precise color and translucency measurement, reconstructing the re-emission spectrum with improved energy efficiency.
Implementation Method 1
A display screen is provided. The target is illuminated with an illumination area on the display screen, while the target is in contact with the display screen. A sensor is provided, positioned behind the display screen to receive light reflected from the target and transmitted back through the display screen.
Implementation Method 2
When light reflects off an object, depending on the properties of the object, light is, in some combination, either reflected, scattered or absorbed. In the color measurement of translucent objects, light penetrates the object, but is also scattered by the object. The scattered light may scatter multiple times before exiting the object at an angle different to that of entry.
Data Source
AI summary
Optical property measurement using a sensor behind a display screen Examples of this application disclose a method for measuring optical properties of a target. The method comprises illuminating the target with an illumination area with a display screen in contact with the target, and analysing signals reflected from the target and transmitted back through the display screen to a sensor positioned behind the display screen, to determine the optical properties of the target.