Backlight Module Using Blue Laser Excitation for Wide Color Gamut
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Solution Overview
Problem
Current laser display technologies for portable miniaturized devices like mobile phones and laptops are hindered by the large size and complex preparation processes of red, green, and blue laser diodes used for display light sources, leading to high costs and inefficiencies.
Innovation Solution
A backlight module utilizing a blue laser diode to excite a laser radiation film, which emits red and green lasers with narrower half-value widths, mixing to form white light, thereby simplifying the preparation process and reducing costs while enhancing spectral purity and color gamut range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If red, green, and blue laser diodes are used as display light sources, then spectral purity and color gamut are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines a blue laser diode with a laser radiation film containing red and green laser materials into a single integrated light source. This merging of multiple laser functions (blue emission from diode + red/green emission from film) into one compact structure eliminates the need for separate red, green, and blue laser diodes, thereby reducing device complexity while maintaining spectral purity and color gamut performance
2Manufacturing precision
If red, green, and blue laser diodes are used as display light sources, then color gamut range is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the functions of three expensive laser diodes into a single blue laser diode combined with a laser radiation film. This consolidation reduces component count and manufacturing complexity, thereby lowering production costs while preserving the wide color gamut range through the narrow half-value widths of the emitted lasers
Solution Approach 2:
The patent uses a blue laser diode to excite laser radiation materials in the film, creating a copied or simulated version of what would otherwise require three separate laser diodes. The laser radiation film acts as a medium that replicates the light emission functions of red, green, and blue lasers through optical excitation, providing cost-effective alternatives to direct laser diode assembly
3Ease of manufacture
If blue laser diode excites laser radiation film to emit red and green lasers, then preparation process is simplified, but spectral purity may be compromised
Solution Approach 1:
The patent employs laser radiation materials with specifically engineered emission characteristics that have narrow half-value widths. By selecting materials with appropriate spectral parameters and optimizing excitation conditions, the system maintains high spectral purity in the emitted red and green lasers while simplifying the overall preparation process compared to assembling three separate laser diodes
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 provides a cost-effective and efficient display light source with improved spectral purity and color gamut, suitable for high color gamut displays, by using a blue laser diode to excite a laser radiation film, resulting in better uniformity and reduced production costs compared to traditional three-color laser diode setups.
Implementation Method 1
a blue laser emitted by the blue laser diode excites the laser radiation film to emit a red laser and a green laser
Implementation Method 2
a blue laser emitted by the blue laser diode excites the laser radiation film to emit a red laser and a green laser
Data Source
AI summary
The present invention provides a backlight module and a display device. The backlight module includes a blue laser diode and a laser radiation film. A light emitting surface of the blue laser diode is disposed close to the laser radiation film. A blue laser emitted by the blue laser diode excites the laser radiation film to emit a red laser and a green laser, and the blue laser, the red laser, and the green laser are mixed to form white light.