Double Cone Reflector for Uniform Backlight Illumination
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Solution Overview
Problem
Conventional backlight units with secondary lenses increase product thickness, leading to misalignment issues, luminance, and color deviations, resulting in a mura phenomenon and decreased uniformity of light irradiation.
Innovation Solution
A backlight unit design that eliminates the need for a secondary lens by using a double cone-shaped reflector with a contacted and spaced reflection portion, integrated into a light guide plate, to improve light distribution and reduce product thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a secondary lens is used to disperse light in a direct type light emitting device package, then light can be uniformly irradiated to the light guide plate, but the entire thickness of the product is increased and misalignment of the lens is generated
Solution Approach 1:
The patent removes the secondary lens from the light emitting device package, extracting the component that causes thickness increase and misalignment. The reflector is repositioned to perform light dispersion functions without requiring the secondary lens, thereby reducing product thickness while maintaining light uniformity.
Solution Approach 2:
The patent combines the light dispersion function previously performed by the secondary lens into the reflector structure. The reflector is designed with specific geometric features (double cone shape with different angles) that enable it to both reflect light and disperse it uniformly, merging two functions into one component.
2Illumination intensity
If a secondary lens is used to disperse light, then light can be uniformly irradiated to the light guide plate, but misalignment of the lens is generated resulting in luminance and color deviations
Solution Approach 1:
The secondary lens is removed from the package, eliminating the source of misalignment issues. The reflector alone is used to achieve light dispersion, removing the component that causes luminance and color deviations due to positioning errors.
Solution Approach 2:
The reflector is designed to be self-aligning through its geometric structure. The double cone shape with specific angle differences enables the reflector to automatically position itself correctly relative to the light emitting device, achieving proper light dispersion without requiring precise external alignment.
3Illumination intensity
If a secondary lens is used to disperse light, then light can be uniformly irradiated to the light guide plate, but the luminance and color deviations deteriorate light characteristics to generate a mura phenomenon
Solution Approach 1:
The secondary lens causing luminance and color deviations is removed. The reflector alone is configured to provide sufficient light dispersion, eliminating the source of mura phenomenon while maintaining uniform light irradiation to the light guide plate.
Solution Approach 2:
The reflector uses specific geometric parameters (double cone shape with different half angles) to control light dispersion characteristics. By optimizing these parameters, the system achieves uniform light distribution without the luminance and color deviations that cause mura phenomenon.
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 design enhances light characteristics, preventing mura phenomena and luminance/color deviations, resulting in a more uniform and high-quality light irradiation, thereby producing a thinner and more reliable product.
Implementation Method 1
a reflector being inserted to be installed into the through-hole and having a contacted reflection portion contacted to the light emitting device and a spaced reflection portion spaced from the light emitting device, wherein the contacted reflection portion and the spaced reflection portion are configured to reflect a light generated in the light emitting device
Data Source
AI summary
Disclosed herein is a backlight unit including a flat substrate, a light emitting device mounted on the flat substrate, a light guide plate disposed on the flat substrate, and a reflector being inserted to be disposed in a through-hole and having a contacted reflection portion contacted to the light emitting device and a spaced reflection portion spaced from the light emitting device. The light guide plate may include an inner wall surface defining the through-hole which accommodates the light emitting device. The contacted reflection portion and the spaced reflection portion are configured to reflect light generated in the light emitting device to penetrate into the light guide plate through the inner wall surface.