Thin Lighting Device Using Light Guide and Prism Sheet
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Solution Overview
Problem
Conventional lighting devices with small light distribution angles face challenges in achieving a thin and low power consumption design, as they often require a parabolic mirror and heat sinks, which increase the device's depth and power consumption.
Innovation Solution
The design incorporates a disc-shaped light guide with a reflection sheet and prism sheet, along with liquid crystal lenses to control light distribution, allowing for a thin and low power consumption lighting device with a small light distribution angle, eliminating the need for a parabolic mirror and heat sinks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a parabolic mirror is used to form parallel light for small light distribution angle, then the light distribution angle is reduced, but the device depth increases
Solution Approach 1:
The patent replaces the mechanical parabolic mirror system with an optical system consisting of a light guide plate with microlens arrays and reflection sheets. This substitution eliminates the need for the deep parabolic mirror structure while achieving the same light collimation effect, thereby reducing device depth while maintaining small light distribution angle.
Solution Approach 2:
The patent transitions from a three-dimensional parabolic mirror structure to a planar light guide plate structure with surface-mounted optical elements. By moving the light collimation function to a two-dimensional plane with microlens arrays and reflection sheets, the system achieves parallel light output without requiring significant depth in the vertical dimension.
2Illumination intensity
If a parabolic mirror and heat sink are used for LED lighting, then the light distribution angle is controlled, but the device becomes bulky and power consumption increases
Solution Approach 1:
The patent merges the light distribution control function and heat management into the light guide plate structure itself. The light guide plate integrates microlens arrays for light collimation, reflection sheets for light redirection, and thermal conduction pathways, eliminating the need for separate parabolic mirrors and heat sink structures.
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: it guides light from the LED source, collimates the light through microlens arrays, redirects light through reflection sheets, and conducts heat away from the LED. This multi-functionality reduces the overall device complexity and size by eliminating separate components.
3Use of energy by moving object
If conventional LED lighting is used, then high luminous efficiency is achieved, but heat generation requires additional heat sink components
Solution Approach 1:
The light guide plate acts as an intermediary structure that manages heat between the LED source and the surrounding environment. The plate's thermal conduction properties and contact with heat-dissipating surfaces provide passive heat management, reducing the need for active cooling systems or bulky heat sinks.
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 enables a compact lighting device with a light distribution angle of approximately 12 degrees while reducing power consumption and heat generation, achieving efficient light collimation and illuminance distribution.
Implementation Method 1
a light guide, having a main surface and a rear surface
Implementation Method 2
a reflection mirror is set in the first hole of the light guide at the side near to the prism sheet
Implementation Method 3
a prism sheet, disposed at the main surface side of the light guide, including a concentric first prism array
Implementation Method 4
a first liquid crystal lens having a circular outer shape is disposed on the prism sheet
Data Source
AI summary
The purpose of the present invention is to realize a lighting device of thin, low power consumption and small light distribution angle. The present invention takes the following structure to realize the above task:A lighting device comprising:a disc shaped light guide, having a main surface and a rear surface, including a first hole at a center,a disc shaped reflection sheet, disposed at the rear surface side of the light guide, including a second hole at a center,a prism sheet, disposed at the main surface side of the light guide, including a concentric first prism array,wherein a reflection mirror is set in the first hole of the light guide at the side near to the prism sheet,an LED is set opposing to the reflection mirror.