Light Absorbing Layer for Display Backlight Color Gamut
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Solution Overview
Problem
Existing display devices with backlight units suffer from reduced color gamut due to color mixing of light emitted by LED sources, which includes wavelengths between red, green, and blue, affecting color purity.
Innovation Solution
Incorporating a light absorbing layer with a light absorbing material, such as porphyrin-based materials, on the backlight unit to absorb wavelengths between the green and red wavelength ranges, thereby separating these wavelengths and enhancing color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a backlight unit with LED light source is used, then the display device achieves high luminance and energy efficiency, but the color gamut is reduced due to color mixing of light wavelengths
Solution Approach 1:
The patent segments the broad LED light spectrum by introducing a light absorbing layer that selectively absorbs specific wavelength ranges (yellow-green light between 560-580nm). This segmentation separates the useful blue, cyan, and green wavelengths from the harmful yellow-green wavelengths, thereby improving color gamut while maintaining the energy-efficient LED light source.
Solution Approach 2:
The light absorbing layer acts as an intermediary element between the LED light source and the color filters. It mediates the light spectrum by absorbing unwanted yellow-green wavelengths before they reach the color filters, preventing color mixing and improving overall color accuracy without compromising the energy efficiency of the LED source.
2Manufacturing precision
If a light absorbing layer is added to improve color gamut, then color purity is enhanced, but device complexity increases
Solution Approach 1:
The light absorbing layer is designed to serve multiple functions simultaneously: it acts as a wavelength-selective filter to improve color purity, serves as an adhesive layer to bond optical components, and functions as a structural support element. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the light absorbing function with the adhesive function by integrating the light absorbing material into the adhesive layer. This combination eliminates the need for separate light absorbing films and adhesive layers, simplifying the overall structure while achieving the desired color purity improvement.
3Manufacturing precision
If specific wavelengths are absorbed to improve color gamut, then color representation is enhanced, but luminance intensity is reduced
Solution Approach 1:
The patent carefully selects and optimizes the absorption characteristics of the light absorbing layer, targeting specific wavelength ranges (560-580nm yellow-green) while allowing other wavelengths to pass through. By adjusting the absorption spectrum parameters to match the human eye's sensitivity curve and the display's colorimetry requirements, the patent enhances color representation while minimizing luminance loss.
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 light absorbing layer effectively increases the color gamut of the display device to 90% or more, while maintaining luminance by absorbing specific wavelengths, thus improving color representation without significantly reducing light intensity.
Implementation Method 1
The light absorbing material absorbs light having a telast one wavelength between a wavelength of green light and a wavelength of a red light
Data Source
AI summary
A display device includes an LED assembly, an optical sheet above the LED assembly, a plate above the optical sheet, a brightness enhancement film above the plate, a display panel above the brightness enhancement film, a light absorbing layer in contact with a first surface of the plate, and the light absorbing layer comprising a light absorbing material and an adhesive material, wherein the light absorbing material absorbs light having at least one wavelength between a wavelength of green light and a wavelength of red light, and wherein the brightness enhancement film or the optical sheet is in contact with a second surface of the plate.