Planar Light-Emitting Device With Segmented LED Lines
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Solution Overview
Problem
Conventional planar light-emitting devices face limitations in achieving high luminance due to restricted number of LED chips and heat dissipation issues, particularly in edge-type devices where the length of the insulation substrate is limited, and machining accuracy constraints.
Innovation Solution
A planar light-emitting device design featuring a linear light-emitter with multiple light-emitting elements arranged in lines on a substrate, surrounded by frames and seals, and a light guide plate with a projecting portion to enhance light incidence and emission, allowing for improved light distribution and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of LED chips is increased to improve luminance, then the luminance is improved, but the length of the insulation substrate is limited and heat dissipation becomes problematic
Solution Approach 1:
The patent transitions from a linear arrangement of LED chips along a single dimension to a two-dimensional matrix arrangement. Multiple lines of LED chips are positioned side by side, allowing the light-emitting structure to expand in multiple dimensions rather than being constrained to a single linear path. This dimensional change enables significantly higher luminance without requiring proportional increases in substrate length.
Solution Approach 2:
The light-emitting structure is divided into multiple separate lines of LED chips that are arranged side by side. Each line can be independently positioned and secured to the substrate, allowing for modular assembly and distribution of heat generation across multiple discrete segments rather than a continuous linear array.
2Illumination intensity
If the number of LED chips is increased to improve luminance, then the luminance is improved, but heat dissipation becomes problematic
Solution Approach 1:
The patent divides the light-emitting structure into multiple separate lines of LED chips spaced apart from each other. This segmentation distributes the heat generation across multiple discrete locations rather than concentrating it in a single linear array, improving overall heat dissipation efficiency.
Solution Approach 2:
By arranging LED chips in a two-dimensional matrix rather than a single linear array, the patent increases the surface area available for heat dissipation. The additional spatial dimension provides more pathways for heat to escape from the structure, reducing thermal accumulation even as the total number of LED chips increases.
3Illumination intensity
If more packages are attached to the insulation substrate to improve luminance, then the luminance is improved, but the machining accuracy of the lead frame becomes problematic
Solution Approach 1:
The patent divides the light-emitting structure into multiple independent lines of LED chips, each line serving as a separate modular unit. This segmentation allows each line to be manufactured and positioned independently, reducing the cumulative impact of machining errors that would affect a single large-scale linear array.
Solution Approach 2:
The transition to a two-dimensional arrangement with multiple lines spaced side by side provides redundancy in the system. If positioning errors occur in one line, they do not propagate through the entire structure as they would in a single linear array, thereby maintaining overall manufacturing precision.
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 design achieves high luminance and uniformity of light emission, overcoming the limitations of conventional devices by allowing a higher density of light-emitting elements and efficient light guidance and distribution.
Implementation Method 1
a light guide plate having an incidence surface having a first flat portion facing to the first line, a second flat portion facing to the second line
Implementation Method 2
The light incident from the incidence surface propagates within the light guide plate and is emitted from the emission surface arranged substantially perpendicular to the incidence surface
Data Source
AI summary
A planar light-emitting device having a linear light-emitter having a substrate extending in a predetermined direction, a first line and a second line including a plurality of light-emitting elements arranged along the predetermined direction on the substrate, the first line and the second line being arranged side by site along the predetermined direction with an interval, a first frame arranged on the substrate so as to surround the first line, a second frame arranged on the substrate so as to surround the second line, a first seal arranged inside the first frame for sealing the plurality of light-emitting elements, a second seal arranged inside the second frame for sealing the plurality of light-emitting elements, and a plurality of electrodes arranged on the substrate and electrically connected with the plurality of light-emitting elements, and a light guide plate having an incidence surface having a first flat portion facing to the first line, a second flat portion facing to the second line, a projecting portion arranged between the first flat portion and the second flat portion and projecting toward the linear light-emitter, and an emission surface emitting light incident from the incidence surface, wherein the projecting portion has a first light-incoming surface arranged at an angle so as to face to an end portion of the first frame on the second frame side, and a second light-incoming surface arranged at an angle so as to face to an end portion of the second frame on the first frame side.