Laser Backlight Module with Transflective Films for High Color Gamut
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Solution Overview
Problem
Current liquid crystal display systems using cold cathode fluorescent lamps (CCFL) or LEDs as backlight sources suffer from poor color richness, high power consumption, and complex structures, while CCFLs are environmentally unfriendly due to mercury content and LEDs require numerous point light sources increasing temperature and module thickness.
Innovation Solution
A backlight module utilizing a laser light source with light guide devices and transflective films to improve light utilization and directivity, achieving high color gamut display without cross color defects, and simplifying the structure by using light guide elements connected with transflective films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED is used as the light source of the backlight module, then the color richness is improved, but the power consumption increases and the module temperature rises
Solution Approach 1:
The patent changes the fundamental parameter of the light source from LED to laser, utilizing laser's unique characteristics (high directionality, high brightness, narrow spectrum) to achieve both high color richness and low power consumption. The laser light source with narrow spectral width provides superior color gamut while consuming less power compared to multiple LEDs.
Solution Approach 2:
The patent replaces the LED-based optical system with a laser-based optical system. This substitution enables better light control through the laser's inherent directionality, reducing the need for complex light guiding structures and lowering overall power consumption while improving color performance.
2Illumination intensity
If LED is used as the light source of the backlight module, then the color richness is improved, but the number of light sources increases and the structure becomes complex
Solution Approach 1:
The patent merges the functions of multiple LEDs into a single laser light source. Instead of using multiple discrete LED chips to achieve different colors, a single laser source (or small number of laser sources) generates light that is then distributed through the light guide structure, significantly simplifying the overall device architecture.
Solution Approach 2:
The patent extracts the color generation function from multiple separate LED components and consolidates it into a single laser source. The laser's narrow spectral width inherently provides the necessary color purity, eliminating the need for complex multi-LED arrangements and their associated control circuitry.
3Illumination intensity
If LED is used as the light source of the backlight module, then the color richness is improved, but the module thickness increases due to light guide plate requirements
Solution Approach 1:
The patent replaces the LED-based light guide plate system with a laser-based system. Laser's superior directionality allows for more compact light distribution, reducing or eliminating the need for thick light guide plates and achieving thinner overall module thickness while maintaining excellent color performance.
4Device complexity
If CCFL is used as the light source of the backlight module, then the structure is simple, but the color richness is poor and the environmental friendliness is compromised
Solution Approach 1:
The patent fundamentally changes the light source parameter from CCFL to laser. This parameter change enables achieving both simple structure and excellent color richness, as laser's narrow spectral width and high directionality provide superior color gamut while maintaining structural simplicity through reduced component count.
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 laser-based backlight module enhances light utilization and color gamut with a simple structure, reducing power consumption and eliminating environmental concerns associated with traditional light sources.
Implementation Method 1
the transflective films are configured to reflect laser from the laser light source into a third direction
Implementation Method 2
light guiding is realized by applying the light guide device with a simple structure, which light guide device is formed by connecting a light guide element with a transflective film
Data Source
AI summary
The embodiments of the present invention provide a backlight module, a liquid crystal display device and a display; laser is used as the light source of the backlight module, improving the utilization of light and realizing high color gamut display. The backlight module comprises a laser light source and several light guide devices provided on a light output side of the laser light source; the several light guide devices are arranged in a first direction; each light guide device comprises several light guide elements and transflective films arranged alternately in a second direction; the transflective films are configured to reflect laser from the laser light source into a third direction; the third direction is perpendicular to the first direction and the second direction.