Backlight Source Light Adjusting Units Uniform Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LCD device backlight systems face challenges in achieving uniform illumination and ultra-thin thickness, with side-coupling methods struggling to ensure even brightness across large panels and back-coupling methods reducing light efficiency and increasing thickness.
Innovation Solution
The use of solid state light sources with a back-coupling method, where light adjusting units with filter plates or films are placed between the light sources and a light transmitting unit to alter the light distribution from Lambertian to larger angle emission, allowing for uniform light mixing in a smaller scattering space, reducing the overall thickness of the backlight source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If light source side-coupling method is used, then the backlight source can be made thinner, but the liquid crystal panel cannot be uniformly illuminated when the size is large
Solution Approach 1:
The patent divides the backlight system into multiple independent light source regions, each with its own light guide plate section. This segmentation allows each local region to be optimized for thinness while the collective arrangement covers large areas uniformly, resolving the contradiction between thinness and uniform illumination capability.
Solution Approach 2:
The patent transitions from traditional single-plane side-coupling to a multi-dimensional configuration where light sources are arranged in specific patterns (e.g., corners, edges) and light guide plates use multi-layer structures with different optical paths. This dimensional optimization enables both thin profile and uniform light distribution across large panels.
2Illumination intensity
If light source back-coupling method is used, then uniform illumination can be achieved, but the total thickness of the backlight source increases
Solution Approach 1:
The patent extracts the scattering function from a separate thick scattering layer and integrates it into the light guide plate structure itself through microstructures or optical layers. This eliminates the need for a dedicated scattering space, achieving uniform illumination without increasing overall thickness.
Solution Approach 2:
The patent merges the light guide plate and scattering body into a single integrated component. The light guide plate incorporates scattering microstructures or optical layers that perform both light guidance and uniform distribution functions, eliminating the need for separate scattering space and reducing total thickness.
3Length of stationary object
If scattering body or scattering space is reduced to make the device ultra thin, then the thickness is reduced, but red, blue or green light spots occur due to insufficient mixture
Solution Approach 1:
The patent applies preliminary light mixing actions through wavelength conversion layers and optical integration layers positioned close to the light sources. These layers pre-mix the light from multiple LEDs before it reaches the light guide plate, ensuring uniform color distribution even in ultra-thin configurations without requiring large scattering spaces.
Solution Approach 2:
The patent introduces wavelength conversion materials and optical integration layers as intermediary elements between the LED light sources and the light guide plate. These intermediaries facilitate efficient light mixing and wavelength conversion in a compact space, preventing color spots while maintaining ultra-thin profile.
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
This approach enables uniform illumination across larger LCD panels while minimizing the thickness of the backlight source, achieving an ultra-thin design without compromising light uniformity or efficiency.
Implementation Method 1
each light adjusting unit includes a filter plate or film which reflects incident lights having incident angles smaller than a threshold angle and transmits incident lights having incident angles larger than or equal to the threshold angle
Implementation Method 2
each light adjusting unit includes a filter plate or film which reflects incident lights having incident angles smaller than a threshold angle and transmits incident lights having incident angles larger than or equal to the threshold angle
Implementation Method 3
a low refractive index medium having a refractive index below 1.3 disposed between the filter plates or films and the solid state light sources
Implementation Method 4
a solid state light source array including a plurality of solid state light sources disposed on the base
Implementation Method 5
solid state light sources emitting lights of different wavelengths
Implementation Method 6
a light transmitting unit disposed above the solid state light source array
Data Source
Figure 1~3
Figure 4~7
Figure 8a~9
AI summary
A backlight source and a thinning method for the same are provided. The backlight source includes: a solid state light source array having a plurality of solid state light sources (1) distributed on the base, a light transmitting unit (3) arranged above the solid state light source array, and a plurality of light adjusting units (2) arranged between the solid state light source array and the light transmitting unit (3). The plurality of the light adjusting units (2) is arranged above the plurality of solid state light sources (1) to reflect the shallow angle incident light from the solid state light source (1), thus changes the light intensity distribution of the output light through the light transmitting unit (3) from the solid state light sources (1) from Lambertian distribution to main sides emission.