Planar Illumination Optics for High-Luminance Light Distribution
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Solution Overview
Problem
Conventional planar illumination devices struggle to efficiently control light distribution with high luminance while meeting specific visual field requirements.
Innovation Solution
A planar illumination device comprising a substrate with two-dimensionally disposed light sources, a condenser lens with a linear Fresnel lens, and a light distribution lens with a linear prism, along with a reflector structure, to achieve the required light distribution characteristics and high luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical lenses are used to control light distribution, then light distribution characteristics can be adjusted, but high luminance and efficient light control within the required visual field range cannot be achieved simultaneously
Solution Approach 1:
The optical system is segmented into multiple specialized optical elements: a first optical element (condenser lens) for light condensation, a second optical element (light distribution lens) for controlling light distribution, and a third optical element for visual field adjustment. Each element performs a specific function to collectively achieve high luminance and efficient light control within the required visual field range.
Solution Approach 2:
The invention transitions from conventional single-plane optical control to a multi-dimensional optical control system. The second optical element introduces a new dimension of control by adjusting the optical axis inclination angle, enabling precise control of light distribution in three-dimensional space while maintaining high luminance.
2Ease of operation
If multiple optical elements are added to control light distribution, then light distribution characteristics improve, but device complexity increases
Solution Approach 1:
Multiple optical elements are merged into a compact integrated structure where the first optical element, second optical element, and third optical element are arranged in sequence along the light path. This merging approach enables complex light distribution control functionality while maintaining a space-efficient and structurally integrated design.
Solution Approach 2:
The optical elements are designed with multi-functionality: the first optical element serves both as a condenser lens for light collection and as part of the overall light distribution system; the second optical element simultaneously controls light distribution and adjusts optical axis inclination; the third optical element fine-tunes the visual field range. This multi-functionality reduces the need for separate dedicated components.
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 device effectively controls light distribution to target visual field ranges while ensuring high luminance and uniformity, utilizing optical elements and reflector design to enhance light efficiency and reduce interference.
Implementation Method 1
The first optical element is disposed at an emission side of the plurality of light sources and condenses light emitted from the plurality of light sources
Implementation Method 2
The second optical element inclines a light distribution of the light condensed by the first optical element with respect to the first axial direction
Data Source
AI summary
A planar illumination device of an embodiment includes a substrate, a first optical element, and a second optical element. A plurality of light sources are two dimensionally disposed at the substrate. The first optical element is disposed at an emission side of the plurality of light sources, and condenses light emitted from the plurality of light sources. The second optical element inclines a light distribution of the light condensed by the first optical element with respect to the first axial direction.