Backlight Module Lens Array and Phosphor Layer Design
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Solution Overview
Problem
Conventional LCD display technology using blue LEDs as light sources suffers from chromatic aberration and low brightness due to limited color rendering index and spectrum, requiring expensive intensifiers to enhance brightness, which increases manufacturing costs.
Innovation Solution
A backlight module incorporating a light guide plate with a photoluminescent layer made from phosphor materials and lens structures on its light-emitting surface, which enhances light uniformity and spectrum width, reducing chromatic aberration and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If blue LED with fluorescent photoluminescent layer is used as light source, then energy saving and long service life are achieved, but color rendering index is low and chromatic aberration occurs
Solution Approach 1:
The patent divides the photoluminescent layer into multiple layers with different phosphor materials. The first photoluminescent layer contains yellow phosphor (Y3Al5O12:Ce) to convert blue light to yellow, while the second photoluminescent layer contains red phosphor (CaAlSiN3:Eu) to generate red light component. This segmentation allows each layer to perform specific wavelength conversion functions, improving overall color rendering while maintaining energy efficiency of LED.
Solution Approach 2:
The patent uses composite phosphor materials in the photoluminescent layers. The combination of yellow phosphor (Y3Al5O12:Ce) and red phosphor (CaAlSiN3:Eu) creates a composite material system that converts blue LED light into a broader spectrum containing both yellow and red components. This composite approach expands the spectrum width and improves color rendering index without sacrificing LED energy efficiency.
2Illumination intensity
If intensifier is disposed between LGP and display panel to increase brightness, then brightness is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the optical parameters of the light guide plate by adding a lens array structure on its light-emitting surface. The lens structures (convex or concave) modify the light distribution pattern and extraction efficiency, increasing brightness without requiring additional intensifier components. This parameter change in the LGP design achieves brightness improvement while avoiding the increased manufacturing cost associated with intensifiers.
Solution Approach 2:
The patent extracts the brightness enhancement function from a separate intensifier component and integrates it into the light guide plate itself through the lens array structure. By taking out the need for a dedicated intensifier and embedding the light control functionality directly in the LGP, the design achieves brightness improvement while reducing component count and manufacturing cost.
3Use of energy by moving object
If blue LED is used as light source, then energy saving is achieved, but brightness cannot achieve ideal state
Solution Approach 1:
The patent introduces photoluminescent layers as intermediary materials between the blue LED light source and the display panel. These photoluminescent layers absorb blue light and re-emit it at different wavelengths (yellow and red), acting as mediators that convert the LED's narrow spectrum into a broader spectrum while maintaining energy efficiency. This intermediary approach enables brightness improvement through enhanced light extraction without sacrificing LED energy savings.
Solution Approach 2:
The patent modifies the optical parameters of the light guide plate by incorporating a lens array structure that changes light extraction efficiency and distribution. This parameter change in the LGP design, combined with the photoluminescent conversion, enables the system to achieve ideal brightness states while maintaining the energy efficiency benefits of blue LED light sources.
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 effectively addresses chromatic aberration and brightness issues by improving light uniformity and spectrum width, reducing the need for expensive intensifiers and lowering manufacturing costs while maintaining high display quality.
Implementation Method 1
the photoluminescent layer is made from phosphor materials, wherein a plurality of lens structures are disposed on one side of the photoluminescent layer facing away from the LGP
Implementation Method 2
a plurality of lens structures are disposed on one side of the photoluminescent layer facing away from the LGP
Data Source
AI summary
A backlight module, a display module and a display device are disclosed. The backlight module includes a light guide plate (LGP); a light source disposed on a light incidence side of the LGP; and a photoluminescent layer disposed on a light-emitting surface of the LGP, the photoluminescent layer is made from phosphor materials, wherein a plurality of lens structures are disposed on one side of the photoluminescent layer facing away from the LGP. The display module includes a LCD and the backlight module. The display device includes the display module.