Backlight Module Parabolic Reflection Slim Design
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Solution Overview
Problem
Existing liquid crystal display backlight modules suffer from chromatic aberration and design limitations due to the use of secondary optical lenses and light guide plates, which occupy significant space and hinder slim design and cost-effectiveness.
Innovation Solution
A backlight module design featuring a light source with a first and second light reflection portion, utilizing interconnected parabolic surfaces and inclined surfaces for efficient light reflection and diffusion, eliminating the need for secondary lenses and light guide plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If secondary optical lens is used in direct-type backlight module, then light can be effectively guided, but module thickness increases and slim design cannot be achieved
Solution Approach 1:
The patent removes the secondary optical lens from the backlight module structure. Instead of using a lens to guide light, the invention uses a light guide plate with specifically designed optical patterns that directly guide light from the LED strip edge, eliminating the need for additional optical components and reducing overall module thickness.
Solution Approach 2:
The patent introduces a light guide plate as an intermediary component between the LED strip and the display screen. This light guide plate contains optical patterns that mediate the light transmission process, replacing the function previously performed by secondary optical lenses while enabling a thinner profile.
2Ease of manufacture
If light guide plate is used in side-incident type backlight module, then light can be effectively distributed, but module complexity and cost increase
Solution Approach 1:
The patent combines the light guide function and the diffuser function into a single integrated light guide plate. The optical patterns are directly formed on the light guide plate itself, merging multiple optical functions that would traditionally require separate components, thereby simplifying the overall module structure and reducing manufacturing complexity.
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: it guides light from the edge, distributes light across the display area, and provides diffusion. This multi-functional design eliminates the need for separate light guide plates and diffusers, reducing both structural complexity and manufacturing steps.
3Object-affected harmful factors
If secondary optical lens and light guide plate are used, then light guidance is effective, but chromatic aberration occurs
Solution Approach 1:
The patent replaces complex optical lens systems with simpler optical patterns formed on the light guide plate. These patterns use total internal reflection and geometric optics rather than refractive optics, avoiding the chromatic dispersion inherent in lens-based systems while maintaining effective light guidance.
Solution Approach 2:
The patent replaces the refractive optical system (lenses) with a geometric optical system based on total internal reflection and patterned surfaces. This substitution eliminates the material dispersion that causes chromatic aberration in lens-based systems while maintaining effective light guidance and distribution.
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 significantly reduces module thickness for slim design and eliminates the need for costly light guide plates, enhancing light reflection and diffusion while minimizing chromatic aberration.
Implementation Method 1
the first reflection parabolic surface performs horizontal reflection on the light emitted from the light source; the second reflection parabolic surface reflects the light emitted from the light source to the second light reflection portion
Implementation Method 2
the third reflection parabolic surface reflects the light emitted from the light source to the second reflection parabolic surface
Implementation Method 3
the first inclined surface and the second inclined surface are used to reflect the light horizontally
Implementation Method 4
the second light reflection portion further comprises an uneven surface extending from a side of the second inclined surface, which is used to perform diffuse reflection on the light
Data Source
AI summary
A backlight module, having: a light source, a first light reflection portion located above the light source, and a second light reflection portion located below the light source; the first light reflection portion includes a groove concaved towards the light source; an inner surface of the groove includes a first reflection parabolic surface and a second reflection parabolic surface interconnected with each other and having a focal point at the light source; the first reflection parabolic surface performs horizontal reflection on the light emitted from the light source; the second reflection parabolic surface reflects the light emitted from the light source to the second light reflection portion; the second light reflection portion performs horizontal reflection on the light reflected thereto. A liquid crystal display having the backlight module is also disclosed.