Laser Display Device Narrow-Band Emission Color Gamut
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices with LED light sources cannot effectively address the requirement for higher resolution and wider color gamut, especially with ultra-high-definition television broadcasts, due to limitations in color gamut expansion caused by the transmittance characteristics of conventional color filter units.
Innovation Solution
A display device utilizing a laser light source unit with red, green, and blue laser diodes, each with narrow-band emission characteristics, combined with optimized color filter films that reduce transmittance of unwanted wavelengths, thereby enhancing color purity and expanding the color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LED light sources with wide-band emission wavelength characteristic are used, then the display device can be manufactured with current technology, but the color gamut cannot be expanded sufficiently for ultra-high-definition television broadcasts
Solution Approach 1:
The patent changes the emission wavelength parameter from wide-band LED to narrow-band laser light sources. This parameter change enables the light source to have a more concentrated spectral output, which when combined with optimized color filters, achieves a wider color gamut suitable for ultra-high-definition television broadcasts.
Solution Approach 2:
The patent employs a composite approach by combining laser light sources with specifically designed color filter films. The color filter films are optimized to work with the narrow-band laser emission characteristics, creating a composite system that achieves superior color gamut performance compared to conventional LED-based displays.
2Manufacturing precision
If the color filter unit is optimized to reduce transmittance of unwanted wavelengths, then color purity is enhanced and color gamut is expanded, but the transmittance characteristics become more restrictive
Solution Approach 1:
The patent optimizes the transmittance parameters of the color filter films to achieve a balance between color purity and light efficiency. By carefully selecting the transmittance characteristics at specific wavelengths, the color filters enhance color purity while minimizing unnecessary light loss.
Solution Approach 2:
The color filter films are designed with local quality optimization, where the transmittance characteristics are specifically tailored for different wavelength regions. The filters allow high transmittance at the desired laser wavelengths while strongly blocking unwanted wavelengths, achieving high color purity without excessive overall light 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 solution enables a wider color gamut closer to the target gamut, improving the display's ability to reproduce colors with higher accuracy and luminance while maintaining low power consumption.
Implementation Method 1
a first laser light source which emits a first laser beam, a second laser light source which emits a second laser beam and a third laser light source which emits a third laser beam
Implementation Method 2
In the green filter film, the difference between a wavelength at which a maximum light transmittance is exhibited and a wavelength at which a light transmittance of 10% is exhibited on the shorter wavelength side is 70 nm or less
Data Source
AI summary
According to one embodiment, a display device includes a light source unit and a color filter unit. The light source unit includes a laser light source unit including a red laser light source, a green laser light source and a blue laser light source. The color filter unit includes a red filter film, a green filter film and a blue filter film. The difference between the center emission wavelength of the green laser beam and that of the blue laser beam falls within the range of 65 to 95 nm. In the green filter film, the difference between a wavelength at a maximum light transmittance and a wavelength at a light transmittance of 10% on the shorter wavelength side is 70 nm or less.