Planar Light-Emitting Device Partition Structure for Backlight Deflection
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Solution Overview
Problem
Existing liquid crystal display backlight units face challenges in reducing weight and thickness while preventing luminance unevenness, particularly with the use of thin sheet-shaped light-diffusing elements which tend to deflect when supported by tapered ends, and thick elements compromise the overall thickness and weight reduction.
Innovation Solution
A planar light-emitting device with a reflector and partition structure that supports sheet-shaped light-diffusing elements on its upper edges, preventing deflection and allowing for thinner, larger elements, and includes light sources in enclosed spaces for efficient light use and local dimming control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a thin sheet-shaped light-diffusing element is used to reduce weight and thickness, then weight and thickness are reduced, but the element deflects undesirably
Solution Approach 1:
The support structure is segmented into multiple support posts distributed across the backlight unit. Each support post independently supports a portion of the light-diffusing element, providing distributed support that prevents deflection while maintaining the element's thinness. This segmentation allows the thin element to be supported at multiple points rather than requiring a single thick element or continuous support structure.
Solution Approach 2:
The support posts act as intermediary elements between the light-diffusing element and the light source assembly. These posts provide the necessary mechanical support to prevent deflection while maintaining the required spacing between the light sources and the light-diffusing element. The intermediary support posts enable the use of thin elements without direct contact between the element and the light sources.
2Stability of the object's composition
If a thick sheet-shaped light-diffusing element is used to suppress deflection, then deflection is reduced, but the overall thickness and weight of the backlight unit increase
Solution Approach 1:
The support function is segmented into multiple discrete support posts rather than relying on the inherent stiffness of a single thick element. This allows the light-diffusing element to remain thin while still achieving deflection suppression through distributed support at multiple locations across the element's surface.
3Illumination intensity
If a lightguide plate is used to guide light from the light source, then light distribution is improved, but weight increases due to the large-sized plate
Solution Approach 1:
The lightguide plate is extracted/removed from the backlight unit structure. Instead of using a large-sized lightguide plate to guide and distribute light, the invention uses multiple independent light sources with support posts to achieve the necessary light distribution. This extraction eliminates the weight of the lightguide plate while maintaining light distribution functionality through the support post structure and direct illumination approach.
4Illumination intensity
If wide spacing is set between light sources and light-diffusing element to prevent luminance unevenness, then luminance uniformity is improved, but the overall thickness of the backlight unit increases
Solution Approach 1:
The spacing between light sources and the light-diffusing element is optimized locally rather than uniformly throughout. The support posts provide localized support at specific positions, allowing the light-diffusing element to be positioned at an optimal distance from light sources at key locations. This local optimization maintains luminance uniformity while minimizing the overall thickness requirement of the backlight unit.
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 a reduction in the overall thickness and weight of the backlight unit, improves light efficiency, and facilitates local dimming for enhanced image quality and power management.
Implementation Method 1
a partition provided on the reflector to extend upward to form a plurality of enclosed spaces over the upper surface of the reflector. The partition having the side surfaces defines the enclosed spaces and are light-reflective.
Implementation Method 2
at least one sheet-shaped light-diffusing element supported on the upper edges of the partition to transmit and diffuse light from the light sources upward.
Data Source
AI summary
A planar light-emitting device enabling reduction in the deflection of a sheet-shaped light-diffusing element includes a reflector having an upper surface serving as a light-reflecting surface, a partition provided on the reflector to extend upward to form a plurality of enclosed spaces over the upper surface of the reflector, light sources disposed in the enclosed spaces, respectively, and at least one sheet-shaped light-diffusing element supported on the upper edges of the partition to transmit and diffuse light from the light sources upward. The side surfaces of the partition that define the enclosed spaces are light-reflecting surfaces.