Backlight Wavelength Converter for LCD Color Gamut
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Solution Overview
Problem
Current LCD devices have limited color gamut, which hinders improved display performance, as the wavelength of light emitted by backlights is fixed and not adaptable to enhance color representation.
Innovation Solution
Incorporating a wavelength converter between the light source and the light guide plate (LGP) in the backlight, which converts the emitted light into a different wavelength, thereby increasing the color gamut of the display device, and using a fixing component with protrusions to securely position the wavelength converter for optimal optical coupling and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wavelength converter is added to the backlight to increase color gamut, then the color representation is improved, but the device structure becomes more complex
Solution Approach 1:
The wavelength converter is integrated directly onto the light-emitting surface of the light source, merging the light generation and wavelength conversion functions into a single compact unit. This reduces the number of separate components and simplifies the overall backlight structure while achieving the desired color gamut enhancement.
Solution Approach 2:
The wavelength converter acts as an intermediary component that receives light from the light source and converts it to the desired wavelength before the light enters the light guide plate. This mediator approach allows for wavelength transformation without requiring fundamental changes to the backlight architecture.
2Productivity
If the wavelength converter is positioned close to the light source for optimal optical coupling, then the light conversion efficiency is improved, but the mechanical stability becomes more difficult to maintain
Solution Approach 1:
By merging the wavelength converter with the light source mounting structure, the design achieves optimal optical coupling while maintaining mechanical stability through a unified structural platform that eliminates relative movement between components.
Solution Approach 2:
The wavelength converter is positioned at a specific location on the light-emitting surface where optical coupling is most effective, while the surrounding structure provides mechanical support. This localized optimization allows for high conversion efficiency at the critical optical interface without compromising overall mechanical stability.
3Ease of manufacture
If the backlight structure is simplified with edge-lit design, then the manufacturing is easier, but the light utilization and mixing effects are reduced
Solution Approach 1:
The wavelength converter changes the color (wavelength) of the light emitted by the light source, enabling the edge-lit design to achieve better light utilization and mixing effects by converting the light to wavelengths that are more effectively utilized by the display panel.
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 enhances the color gamut of LCD devices by converting light wavelengths, simplifies the backlight structure with an edge-lit design, and improves mechanical performance through secure positioning, resulting in better light utilization and mixing effects.
Implementation Method 1
a wavelength converter disposed on a light-emitting side of the light source and configured to convert the light having the first wavelength into light having a second wavelength upon passing through the wavelength converter
Implementation Method 2
a light guide plate (LGP) disposed on one side of the wavelength converter away from the light source, and configured to receive and re-emit the light emitted from the wavelength converter
Data Source
AI summary
A backlight, an assembly method thereof and a display device are disclosed. The backlight includes a light source configured to emit light having a first wavelength; a wavelength converter disposed on a light-emitting side of the light source and configured to convert the light having the first wavelength into light having a second wavelength upon passing through the wavelength converter, in which the second wavelength is different from the first wavelength; and a light guide plate disposed on one side of the wavelength converter away from the light source, and configured to receive and re-emit the light emitted from the wavelength converter.