Image Display Panel Diffraction Grating for Ambient-Light Sensing
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Solution Overview
Problem
Existing image display apparatuses face challenges in accurately detecting ambient light due to the difficulty in disposing ambient light sensors within the display region, leading to reduced light detection accuracy and interference from light emitted by the display panel.
Innovation Solution
Incorporating a diffraction grating system within the image display panel to diffract ambient light at different angles for each wavelength, allowing for precise detection by a light detection unit, and optionally using a light guide plate to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the ambient light sensor is disposed in a housing portion outside the display region, then the display region can be maximized, but the device frame becomes wider reducing display area
Solution Approach 1:
The ambient light sensor is merged with the display panel structure by disposing it on the back surface side of the display panel, combining the sensing function with the display structure to eliminate the need for separate housing space
Solution Approach 2:
The ambient light sensor is positioned in a different spatial dimension (back surface side) relative to the display region, allowing it to be integrated without increasing the front-facing frame width
2Measurement precision
If ambient light is passed through a color filter to measure color temperature, then color temperature measurement is enabled, but the amount of light detected for each wavelength is reduced
Solution Approach 1:
The color filter is extracted/removed from the light path, allowing all wavelengths of ambient light to reach the sensor without being blocked by color filter materials
Solution Approach 2:
The mechanical/color-based wavelength separation (color filter) is replaced with an optical diffraction-based separation system that can precisely direct different wavelengths to different detection regions
3Measurement precision
If light from the image display panel is reflected by layer interfaces and transmitted through the panel, then light detection is enabled, but noise is introduced reducing measurement accuracy
Solution Approach 1:
The harmful reflected light is extracted and separated from the useful transmitted light by using a diffraction grating that directs different wavelengths to different angles, allowing only the desired light to reach the sensor
Solution Approach 2:
The diffraction grating acts as an intermediary optical element that selectively directs specific wavelengths to the sensor while blocking others, filtering out noise from reflected light
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 enables high-accuracy detection of ambient light at each wavelength, minimizing interference from display panel emissions and maximizing the use of transmitted light for accurate luminance and color temperature measurement.
Implementation Method 1
a diffraction grating that diffracts light of each wavelength component at different angles according to a wavelength of the ambient light that has passed through the transmission unit
Data Source
AI summary
Provided is an image display apparatus capable of detecting the amount of light of each wavelength of the ambient light transmitted through the image display panel with high accuracy in an image display apparatus including an image display panel and an ambient light sensor system. An image display apparatus includes an image display panel and an ambient light sensor system, in which the image display panel includes a transmission unit that allows ambient light to pass through in a display region. The ambient light sensor system includes a diffraction grating that diffracts light of each wavelength component at different angles according to a wavelength of the ambient light that has passed through the transmission unit, and a light detection unit that receives the light diffracted by the diffraction grating.