Backlight Unit Reflective Layers Uniform Illumination
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Solution Overview
Problem
Conventional display apparatuses with backlight units using LED point light sources face inefficiencies and increased costs due to the need for optical lenses that require a shorter optical distance, leading to non-uniform illumination and complex manufacturing processes.
Innovation Solution
A display apparatus with a backlight unit that employs a reflective layer system, where a first reflective layer reflects light with varying reflection and transmission based on the angle of incidence, and a second reflective layer forms a virtual light source to achieve uniform and wide illumination using a small number of light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical lenses are used to diffuse light from LED point sources, then illumination coverage is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the optical lens component from the illumination system entirely. Instead of using a lens to diffuse light, the invention employs reflective layers that redirect light from LED point sources to achieve uniform illumination without requiring complex optical elements, thereby reducing device complexity and manufacturing cost while maintaining illumination coverage
Solution Approach 2:
The patent introduces reflective layers as intermediary elements between the LED light sources and the display panel. These reflective layers serve as mediators that redirect and distribute light uniformly across the display area, replacing the need for optical lenses and simplifying the overall system architecture
2Illumination intensity
If optical lenses are used to achieve wide illumination area, then illumination uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive optical lenses with inexpensive reflective layers that can be manufactured using standard thin-film deposition techniques. The reflective layers achieve the same illumination uniformity function at a fraction of the cost, making the manufacturing process more economically viable
3Device complexity
If a small number of LED point light sources are used, then device simplicity is improved, but illumination uniformity deteriorates
Solution Approach 1:
The patent applies local quality by designing reflective layers with spatially varying properties. The reflective layers are positioned and configured to redirect light from specific LED locations to specific target areas, creating uniform illumination distribution across the display panel despite using a limited number of point light sources
4Length of moving object
If shorter optical distance is used between LED sources and panel, then device thickness is reduced, but illumination uniformity deteriorates
Solution Approach 1:
The patent solves the illumination uniformity problem by operating in a different dimensional space. Instead of relying on increased optical distance for light diffusion, the invention uses reflective layers to redirect light paths in multiple dimensions, achieving uniform illumination even at short distances between the LED sources and the display panel
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 configuration secures a uniform and wide illumination area with fewer light sources, reducing manufacturing complexity and costs while minimizing hot spots and enhancing light distribution uniformity.
Implementation Method 1
a first reflective layer configured to reflect the light emitted by the plurality of light sources; an amount of reflection from the first reflective layer and an amount of transmission through the first reflective layer are different from each other according to an angle of incidence of light incident on the first reflective layer
Implementation Method 2
a second reflective layer configured to reflect the light reflected from the first reflective layer, wherein the second reflective layer is configured to reflect the light reflected from the first reflective layer to form a virtual light source at a position between the plurality of light sources
Data Source
AI summary
Provided is a backlight unit, a display apparatus, and a method of manufacturing the display apparatus capable of securing a uniform and wide illumination area with a small number of light sources through reflection of a reflective layer. The backlight unit includes a plurality of light sources configured to emit light; a first reflective layer configured to reflect the light emitted from the plurality of light sources; and a second reflective layer configured to reflect the light reflected from the first reflective layer, wherein an amount of reflection from the first reflective layer and an amount of transmission through the first reflective layer are different from each other according to an angle of incidence of light incident on the first reflective layer.