LED Illumination Device with Segmented Matrix Spacing
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Solution Overview
Problem
Illumination devices with point light sources, such as LEDs, suffer from a phenomenon called 'prominent chips' where the positions of the light sources become visibly distinct due to significant luminance differences, leading to deterioration in display quality.
Innovation Solution
The illumination device features a matrix arrangement of light-emitting elements on a substrate with partial regions, where two-by-two arrays of LEDs are positioned at different intervals, and an optical member with inclined surfaces to diffuse light uniformly, ensuring that light-emitting elements do not protrude from the inclined surfaces, thereby reducing luminance disparities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If point light sources are arranged in a matrix to illuminate a display panel, then the illumination device can provide sufficient brightness, but the positions of the light sources become visibly distinct causing deterioration in display quality
Solution Approach 1:
The substrate is divided into multiple partial regions, with light-emitting elements arranged in specific patterns within each region. This segmentation allows different spacing configurations (first interval within regions, second interval between regions) to be applied, creating a structured arrangement that reduces visible point sources while maintaining overall brightness
Solution Approach 2:
Different spacing intervals are applied to different locations of light-emitting elements. Elements within the same partial region are spaced at a first interval, while elements across adjacent partial regions are spaced at a longer second interval. This local differentiation in spacing creates a more uniform luminance distribution that reduces the prominent chips effect
2Manufacturing precision
If light-emitting elements are arranged with uniform spacing to simplify manufacturing, then manufacturing precision is improved, but luminance uniformity deteriorates causing visible point sources
Solution Approach 1:
The patent implements non-uniform spacing by defining different intervals for different locations: a first interval for elements within the same partial region and a second interval (longer than the first) for elements across adjacent partial regions. This local quality differentiation achieves uniform luminance distribution while maintaining manufacturability through clear spacing rules
Solution Approach 2:
The substrate is divided into multiple partial regions with specific light-emitting element arrangements in each region (e.g., two-by-two matrices). This segmentation enables the application of different spacing strategies in different regions, achieving overall luminance uniformity through structured local variations
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 configuration reduces the visibility of light sources, achieving a more uniform luminance distribution and enhancing display quality by minimizing the prominence of individual LEDs.
Implementation Method 1
an optical member that faces the substrate and on which light from the light-emitting elements is incident. The optical member has a plurality of inclined surfaces
Data Source
AI summary
According to an aspect, an illumination device includes: a plurality of light-emitting elements arrayed in a matrix along two directions; and a substrate on which the light-emitting elements are provided. The substrate has a plurality of partial regions. The light-emitting elements are arranged in the partial regions such that four light-emitting elements are arrayed in a two-by-two matrix along the two directions in each of the partial regions. Two light-emitting elements adjacent to each other in each of the partial regions are arranged at a first interval in one direction of the two directions. Two light-emitting elements adjacent to each other with a boundary of two partial regions adjacent to each other along the one direction interposed therebetween are arranged at a second interval in the one direction. The first interval is shorter than the second interval.