Lighting Device with Prism Sheet Louvers for Compact Beam Control
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Solution Overview
Problem
Conventional lighting devices with small light distribution angles are difficult to make thin and compact due to the need for large parabolic mirrors, and they suffer from significant leakage light with broad emission directions, making it hard to control light distribution accurately.
Innovation Solution
A lighting device design featuring a light guide with LEDs on its side surfaces, a prism sheet with intersecting louvers, and a liquid crystal lens to control light distribution, reducing leakage and achieving high directivity and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a parabolic mirror is used to achieve a small light distribution angle, then the directivity is improved, but the device depth increases and it becomes difficult to make the lighting device thin and compact
Solution Approach 1:
The patent replaces the mechanical parabolic mirror structure with an optical system consisting of a light guide, prism sheet, and louver structure. This substitution eliminates the need for deep mechanical structures while achieving the same light collimation effect through optical refraction and reflection principles.
Solution Approach 2:
The patent transitions from a three-dimensional parabolic mirror to a two-dimensional louver structure combined with a prism sheet. The louver structure uses planar geometric arrangements to achieve light direction control, reducing the depth requirement from the third dimension while maintaining optical performance.
2Length of moving object
If a thin lighting device structure is adopted, then the device size is reduced, but the light distribution angle becomes large and leakage light increases
Solution Approach 1:
The patent combines multiple optical components (light guide, prism sheet, louver structure) into a composite optical system. Each component contributes to light control in a specific way, and their combination achieves both thin profile and narrow beam angle, solving the contradiction between device thickness and light distribution control.
Solution Approach 2:
The patent divides the light control function into multiple segments: the light guide for initial light distribution, the prism sheet for refraction and direction control, and the louver structure for final beam shaping. This segmentation allows each component to be optimized for thinness while collectively achieving narrow beam control.
3Ease of operation
If conventional optical structures are used, then light direction control is achieved, but the device complexity and size increase
Solution Approach 1:
The light guide serves multiple functions: it guides light from LEDs, provides structural support, and works in conjunction with the prism sheet and louver to achieve beam control. This multi-functionality reduces the need for separate components, simplifying the overall device structure while maintaining light direction control capability.
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 thin, compact lighting device with precise control over light distribution, minimizing leakage and achieving high directivity and uniformity, improving light projection quality.
Implementation Method 1
providing a lens to change a direction of light from the light source... if a liquid crystal lens is used, a focus of the lens can be changed easily
Implementation Method 2
Patent document 1 discloses a structure of lighting device, in which a refracting means is set over a direct type light source to change a direction of the light
Implementation Method 3
a prism sheet set on a major surface of the light guide
Implementation Method 4
a first louver which extends in a first direction and a second louver which extends in an orthogonal direction to the first direction are superposed on the prism sheet
Implementation Method 5
a light guide; LEDs set at a side surface of the light guide
Data Source
AI summary
The purpose of the present invention is to realize a lighting device of small light distribution angle and less leakage light and further to realize a lighting device in which the light beam is easy to control. The following is an example of the structure to meet the above purpose. A lighting device including: a light guide; LEDs set at a side surface of the light guide; a prism sheet set on a major surface of the light guide, in which a first louver which extends in a first direction and, a second louver which extends in an orthogonal direction to the first direction are superposed on the prism sheet.