LED Array Orientation for Uniform Luminance
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Solution Overview
Problem
Conventional LED array panels with light emitting elements arranged in the same orientation result in uneven illuminance and luminance, leading to visually recognizable patterns on the light-emitting surface and the irradiated surface, such as liquid crystal panels.
Innovation Solution
A light emitting device with light emitting elements having specific three-dimensional shapes and light distribution characteristics, arranged in a matrix with a uniform pitch, where the first lateral surfaces of adjacent elements form acute and obtuse angles, preventing the visual recognition of unevenness in luminance by directing light emissions differently between adjacent elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light emitting elements are arranged in the same orientation in a matrix at uniform pitch, then manufacturing is simplified and device complexity is reduced, but uneven luminance occurs and visual patterns are formed on the light-emitting surface
Solution Approach 1:
The patent applies asymmetry by arranging light emitting elements at different orientations (e.g., 0°, 45°, 90°, 135°) rather than all in the same orientation. This asymmetric angular distribution prevents the formation of regular luminance patterns while maintaining the simplicity of matrix arrangement at uniform pitch, thus resolving the contradiction between device complexity and luminance uniformity.
Solution Approach 2:
The patent implements local quality by varying the orientation angle of individual light emitting elements based on their specific position in the matrix. Each element is oriented differently according to a predetermined pattern, creating local variations in light emission direction that collectively achieve uniform overall luminance distribution without complicating the overall device structure.
2Illumination intensity
If light emitting elements are arranged at different angles (e.g., 90° apart) to achieve uniform luminous intensity distribution, then luminance uniformity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the orientation angle parameter of light emitting elements systematically across the matrix. By varying this single parameter (angle) according to a simple mathematical pattern (e.g., multiples of 45°), the patent achieves uniform luminance distribution without introducing complex structural changes, manufacturing processes, or additional components, thus improving luminance uniformity while minimizing device complexity.
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 achieves uniform intensity distribution on the light emitting surface and reduces the visual recognition of luminance unevenness, effectively addressing the issue of successively continuing brighter or darker patterns.
Implementation Method 1
a pair of first lateral surfaces slanted with respect to the lower surface... that forms an acute angle with the lower surface and an obtuse angle with the lower surface
Data Source
AI summary
A light emitting device includes a wiring substrate, and light emitting elements. The light emitting elements are aligned in a first array, and each includes a sapphire substrate having a lower surface, a pair of first lateral surfaces slanted with respect to the lower surface, and a pair of second lateral surfaces perpendicular to the lower surface, with the pair of first lateral surfaces has an acute angle lateral surface and an obtuse angle lateral surface, and a semiconductor layered structure disposed on the sapphire substrate. In a plan view, a direction along which the second lateral surfaces of one of the light emitting elements in the first array extend forms an angle of 45° with respect to a direction along which the second lateral surfaces of an adjacent one of the light emitting elements in the first array extend.