Backlight Unit Reflection Filters Color Gamut
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Solution Overview
Problem
The color reproduction range of backlight units is limited by the color conversion material, and there is a need to enhance light efficiency and image quality without changing the types or amounts of these materials.
Innovation Solution
A backlight unit design incorporating multiple light sources, reflection filters, light conversion patterns, a color conversion sheet, and a light path control sheet, which includes a second reflection filter with a light path control pattern, to reflect and control light wavelengths, thereby improving color reproduction and light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color conversion material is used to convert short wavelength light to white light, then the backlight unit can supply white light to the display panel, but the color reproduction range is limited by the color conversion material
Solution Approach 1:
The patent divides the color conversion function into multiple separate conversion layers, each responsible for converting specific wavelength ranges. Instead of using a single complex color conversion material, the system segments the conversion process into multiple stages with intermediate reflection filters, thereby expanding the overall color reproduction range while maintaining manageable material complexity
Solution Approach 2:
The patent introduces a vertical stacking dimension with multiple conversion layers and reflection filters arranged in sequence. This multi-layer structure adds a dimensional aspect to the color conversion process, allowing light to undergo multiple conversion cycles and thereby expanding the color reproduction range beyond what a single material layer could achieve
2Illumination intensity
If multiple optical members are added to expand color reproduction range, then color reproduction improves, but light efficiency may be reduced
Solution Approach 1:
The patent designs the optical path so that light undergoes continuous useful conversion actions as it passes through multiple layers. The reflection filters are positioned to redirect converted light back through subsequent conversion layers, ensuring that light energy continues to perform useful color conversion work rather than being lost, thereby maintaining high light efficiency while expanding color reproduction
Solution Approach 2:
The reflection filters create a feedback mechanism where converted light is redirected back through the conversion layers. This feedback loop allows light to undergo multiple conversion cycles, maximizing the utilization of light energy and improving overall light efficiency while achieving expanded color reproduction range through repeated conversion actions
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 design enhances the color reproduction range and light efficiency of the backlight unit, improving image quality by effectively managing light wavelengths and distribution.
Implementation Method 1
a first reflection filter positioned on the light source protection portion and reflecting at least a part of a light of a wavelength band other than a wavelength band of a light emitted from the light source
Implementation Method 2
a color conversion sheet positioned on the first reflection filter
Implementation Method 3
a second reflection filter positioned on the color conversion sheet and reflecting a light of a part wavelength band of a wavelength band of a light reflected by the first reflection filter
Implementation Method 4
a light path control sheet may comprise a first layer positioned adjacent to the color conversion sheet and having a first refractive index, and a second layer positioned adjacent to the second reflection filter and disposed as a shape meshed with the first layer and having a second refractive index greater than the first refractive index
Data Source
AI summary
Embodiments of the disclosure are related to a backlight unit and a display device, by disposing a filter reflecting a green light of a long wavelength on a color conversion sheet and disposing a filter reflecting a green light and a red light under the color conversion sheet, a wavelength band of a light supplied to a display panel is controlled and a color reproduction range may be improved while increasing a light efficiency. Furthermore, by disposing a sheet increasing an amount of a vertical light on the color conversion sheet, a wavelength band of a light reflected by a filter disposed on the color conversion sheet is controlled exactly and the backlight unit and the display device capable of a wide color gamut may be provided.