Reflective Plate Backlight for Uniform Luminance
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Solution Overview
Problem
Conventional surface light emitting apparatuses with point light sources, such as LEDs, face challenges in achieving uniform luminance distribution without using optical guide plates, leading to uneven light emission and increased weight and depth in larger liquid crystal display devices.
Innovation Solution
A surface light emitting apparatus comprising a substrate with multiple light sources and reflectors, where the first surface of each reflector covers the light source and the second surface reflects and scatters the light, allowing for uniform light emission without an optical guide plate, thereby reducing weight and depth while preventing direct light spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical guide plate is used to achieve surface light emission, then uniform luminance distribution is improved, but weight and depth of the backlight source increase
Solution Approach 1:
The patent extracts and removes the optical guide plate from the backlight system, replacing it with a reflective plate that directs light from edge-mounted LEDs to the light-emitting surface. This elimination of the optical guide plate reduces both weight and depth while maintaining uniform luminance distribution through the reflective plate's geometric design
Solution Approach 2:
The patent introduces a reflective plate as an intermediary component between the edge-mounted LEDs and the light-emitting surface. This reflective plate serves as a mediator that redirects and distributes light uniformly across the surface, replacing the function previously performed by the optical guide plate but with reduced weight and depth
2Illumination intensity
If an optical guide plate is used to achieve surface light emission, then uniform luminance distribution is improved, but depth of the backlight source increases
Solution Approach 1:
The patent extracts and removes the optical guide plate from the backlight system, replacing it with a reflective plate that directs light from edge-mounted LEDs to the light-emitting surface. This elimination of the optical guide plate reduces both weight and depth while maintaining uniform luminance distribution through the reflective plate's geometric design
Solution Approach 2:
The patent changes the mounting dimension of the light source from face-mounted (requiring depth for the optical guide plate) to edge-mounted (utilizing the side of the display). This dimensional change allows the reflective plate to be positioned at an angle to direct light onto the surface, significantly reducing the required depth of the backlight assembly
3Weight of stationary object
If point light sources like LEDs are used without optical guide plate, then weight and depth are reduced, but luminance uniformity deteriorates
Solution Approach 1:
The patent introduces a reflective plate as an intermediary component between the edge-mounted LEDs and the light-emitting surface. This reflective plate serves as a mediator that redirects and distributes light uniformly across the surface, replacing the function previously performed by the optical guide plate but with reduced weight and depth
Solution Approach 2:
The reflective plate is divided into multiple segments or zones, each responsible for directing light from specific LED segments to different regions of the light-emitting surface. This segmentation allows for precise control and uniform distribution of luminance across the entire surface while maintaining the weight advantages of using LEDs without an optical guide plate
4Length of stationary object
If point light sources like LEDs are used without optical guide plate, then weight and depth are reduced, but luminance uniformity deteriorates
Solution Approach 1:
The patent extracts and removes the optical guide plate from the backlight system, replacing it with a reflective plate that directs light from edge-mounted LEDs to the light-emitting surface. This elimination of the optical guide plate reduces both weight and depth while maintaining uniform luminance distribution through the reflective plate's geometric design
Solution Approach 2:
The patent changes the mounting dimension of the light source from face-mounted (requiring depth for the optical guide plate) to edge-mounted (utilizing the side of the display). This dimensional change allows the reflective plate to be positioned at an angle to direct light onto the surface, significantly reducing the required depth of the backlight assembly
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 enables surface light emission with high uniformity and luminance, allowing for smaller, lighter, and more efficient backlight sources for large liquid crystal displays, with the ability to diffuse light effectively from point sources like LEDs.
Implementation Method 1
a first surface that covers the light sources and a second surface that reflects or scatters the irradiated light
Implementation Method 2
a second surface that reflects or scatters the irradiated light
Data Source
AI summary
A surface light emitting apparatus that can be made smaller in depth and lighter in weight and has high uniformity in luminance over the light emitting surface is disclosed. The surface light emitting apparatus of the present invention comprising a substrate, a plurality of light sources on the substrate, and a plurality of reflectors on the substrate, each of the reflectors having a first surface that covers the light sources and a second surface that reflects or scatters the irradiated light, wherein the reflectors are disposed so that the second surface is irradiated with a light emitted by the light source by the first surface of the adjacent reflector, and the light reflected or scattered by the second surface is emitted to outside.