Backlight Unit Reflecting Protrusions for Edge-Light Brightness
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Solution Overview
Problem
Existing backlight units for liquid crystal display devices, such as those described in Patent Document 1, do not provide sufficient light collecting effects for improved brightness, particularly in the edge-light type configuration where cylindrical lenses and prism sheets are used.
Innovation Solution
A lighting device with a light guide plate, anisotropic light collecting portions, reflecting protrusions, and a light emission reflecting portion that includes unit reflecting portions and auxiliary reflecting surfaces to enhance light collection and distribution, reducing uneven brightness and increasing light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If cylindrical lenses and prism sheets are used in edge-light type backlight devices, then light collecting effects are improved, but brightness is still insufficient
Solution Approach 1:
The light guide plate is divided into multiple functional regions: a light entering surface for light input, a light exiting surface for light output, and a light emission reflecting portion with multiple unit reflecting portions. Each region performs a specific optical function to collectively improve brightness through systematic light management rather than relying on complex lens and sheet assemblies.
Solution Approach 2:
The patent introduces a third dimension (depth/thickness direction) by creating protrusions and recesses on the light guide plate surface. The unit reflecting portions protrude from the light exiting surface, and the light emission reflecting portion is positioned at a specific depth, utilizing vertical spatial arrangement to enhance light collection and distribution efficiency without increasing planar complexity.
2Illumination intensity
If multiple optical components are added to improve light collection, then brightness increases, but the number of components and thickness increase
Solution Approach 1:
The patent merges multiple optical functions into a single integrated light guide plate structure. The light guide plate simultaneously performs light guidance, light emission, and light reflection functions through its internal structure design, eliminating the need for separate cylindrical lenses, prism sheets, and reflector components that would otherwise increase thickness.
Solution Approach 2:
The light guide plate is designed as a multi-functional component that combines light transmission, light reflection, and light collection capabilities. The same light guide plate structure serves as both the light guiding medium and the light emitting surface with integrated reflecting portions, reducing the overall component count and device thickness.
3Use of energy by moving object
If conventional light collecting structures are used, then some light collection is achieved, but light use efficiency remains insufficient
Solution Approach 1:
The light emission reflecting portion with unit reflecting portions creates a feedback mechanism where light that would otherwise be lost is reflected back into the light guide plate. The recessed portions and protruding structures guide reflected light back toward the light exiting surface, creating a循环利用 system that improves overall light use efficiency.
Solution Approach 2:
The patent converts potentially harmful light loss into beneficial light utilization. Light that would normally escape uselessly from the light guide plate is captured by the unit reflecting portions and redirected back into the system, transforming energy loss into useful light output that enhances brightness and efficiency.
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 improves light collection and distribution, enhancing brightness and reducing unevenness, while also reducing the number of components and thickness of the lighting device.
Implementation Method 1
The light guide plate is for guiding light from a light source arranged at an end
Implementation Method 2
The light exiting-side anisotropic light collecting portion includes light exiting-side unit light collecting portions that extend along a first direction and are arranged along a second direction
Implementation Method 3
The light emission reflecting portion include unit reflecting portions formed by recessing portions of the opposite plate surface
Data Source
AI summary
A backlight unit includes a light emission reflecting portion, first reflecting protrusions, and second reflecting protrusions. The light emission reflecting portion includes unit reflecting portions that include main reflecting surfaces and light reentering surfaces arranged opposite to the main reflecting surfaces, respectively. The first reflecting protrusions include extended main reflecting surfaces that continue to the main reflecting surfaces, respectively, and first auxiliary reflecting surfaces that reflect rays of light traveling toward an opposite plate surface and direct the rays of light toward the main reflecting surfaces and the extended main reflecting surfaces. The second reflecting protrusions include extended light reentering surfaces that continue to the light reentering surfaces, respectively, and second auxiliary reflecting surfaces that reflect rays of light entering through at least one of the light reentering surfaces and the extended light reentering surfaces and direct the rays of light toward the light exiting surface.