Backlight Unit Light Absorption Material Wide Color Gamut
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices have a relatively low color gamut, making it difficult to display a wide range of colors and resulting in a lower quality image, with an overlap ratio of about 81% to the DCI color standard, which is insufficient for high-quality color representation.
Innovation Solution
Incorporating a backlight unit with a light source that includes a blue LED chip, yellow and red phosphors, and a light absorption material with an absorption peak between the red and green wavelengths, which adjusts the emission spectrum to enhance color representation and increase the color gamut to over 95% overlap with the DCI standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight units with standard LED chips and phosphors are used, then the device structure remains simple and manufacturing cost is low, but the color gamut is limited to about 81% overlap with DCI standard
Solution Approach 1:
The patent uses a composite light source system combining blue LED chip (440-470nm peak wavelength) with yellow phosphor (560-580nm peak wavelength) and red phosphor (610-650nm peak wavelength), creating a multi-component phosphor blend that achieves wide color gamut (over 95% DCI overlap) while maintaining manufacturability
Solution Approach 2:
The patent optimizes the peak wavelengths of the blue LED chip (440-470nm) and phosphors (yellow: 560-580nm, red: 610-650nm) to match the DCI color standard requirements, achieving over 95% color gamut overlap through precise spectral parameter control
2Illumination intensity
If multiple phosphors with different peak wavelengths are used to expand color gamut, then color representation improves, but the light source structure and manufacturing complexity increase
Solution Approach 1:
The patent creates a composite phosphor material system combining yellow phosphor (560-580nm peak) and red phosphor (610-650nm peak) that can be mixed and applied as a unified layer, simplifying the manufacturing process while achieving the spectral characteristics needed for wide color gamut
Solution Approach 2:
The patent specifies optimal peak wavelength ranges for each phosphor component (yellow: 560-580nm, red: 610-650nm) to ensure that the combined emission spectrum achieves over 95% DCI color standard overlap, balancing performance with manufacturability
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 significantly improves the color gamut of the LCD device, allowing for a wider range of color representation while maintaining low manufacturing costs and ensuring heat resistance, thus providing a high-quality image with improved brightness efficiency.
Implementation Method 1
a light absorption material having an absorption maximum at a wavelength between the second peak wavelength and the third peak wavelength
Implementation Method 2
a first luminous material having a first peak wavelength, a second luminous material having a second peak wavelength greater than the first peak wavelength, and a third luminous material having a third peak wavelength greater than the second peak wavelength
Data Source
AI summary
A liquid crystal display device, includes a liquid crystal panel; and a backlight unit under the liquid crystal panel and having a light source. The light source includes a first luminous material having a first peak wavelength, a second luminous material having a second peak wavelength greater than the first peak wavelength, a third luminous material having a third peak wavelength greater than the second peak wavelength, and a light absorption material having an absorption maximum at a wavelength between the second peak wavelength and the third peak wavelength.