Backlight Unit Color Conversion Layer Absorption
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Solution Overview
Problem
Current display technologies face challenges in precisely controlling the wavelength band of light emitted by subpixels, which limits the color gamut of images displayed, and existing solutions either increase manufacturing costs or complicate the device structure.
Innovation Solution
A backlight unit with a plurality of light sources emitting a first wavelength band, a color conversion layer that converts at least a portion of this light into other wavelength bands, and a light absorption layer that absorbs specific wavelengths, along with a light path control film to manage light emission, enhancing color gamut while maintaining cost-effectiveness and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color conversion layer is added to convert light wavelength bands, then color gamut is improved, but device complexity increases
Solution Approach 1:
The patent combines the color conversion function and light absorption function into a single integrated layer structure. The color conversion layer contains both color conversion particles and light absorption particles, allowing simultaneous wavelength conversion and harmful light absorption without adding separate components, thus improving color gamut while avoiding excessive structural complexity
Solution Approach 2:
The patent uses composite material structures where the color conversion layer is formed by combining multiple types of particles (color conversion particles and light absorption particles) within a single layer. This composite approach enables multiple functions (wavelength conversion and absorption) to be achieved in one layer, resolving the contradiction between improving color gamut and avoiding structural complexity
2Adaptability or versatility
If multiple functional layers are added to control light wavelength, then color gamut is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges color conversion and light absorption functions into a single layer, reducing the total number of manufacturing steps. Instead of adding separate layers for each function, the integrated approach requires only one deposition process, thereby improving color gamut while controlling manufacturing costs
3Adaptability or versatility
If light absorption layer is added to absorb specific wavelengths, then color gamut is improved, but device complexity increases
Solution Approach 1:
The patent integrates the light absorption function directly into the color conversion layer by incorporating light absorption particles alongside color conversion particles. This merging eliminates the need for a separate light absorption layer, thereby improving color gamut while avoiding the increase in structural complexity that would result from adding another distinct layer
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 effectively increases color gamut by optimizing light absorption and conversion, improving the quality of displayed images without increasing manufacturing costs or complicating the device structure.
Implementation Method 1
a color conversion layer converting at least a portion of the light of the first wavelength band into light of a wavelength band other than the first wavelength band
Implementation Method 2
a light absorption layer disposed on the color conversion layer and absorbing light of an absorption wavelength band which is a portion of a white wavelength band
Data Source
AI summary
A backlight unit and a display device are disclosed. There may be provided a backlight unit and a display device with enhanced light absorption of light of an absorption wavelength band and enhanced color gamut, by including a color conversion layer (or color conversion film) for converting the wavelength band of the light emitted from a light source and a light absorption layer (or light absorption film) for absorbing light of a specific absorption wavelength band, in an area adjacent the light source.