Planar Lighting Device Prism Light Distribution Control
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Solution Overview
Problem
Conventional planar lighting devices face challenges in controlling the distribution of both illumination and design light, as they require simultaneous management of light intensity and pattern display, which is difficult to achieve effectively.
Innovation Solution
A planar lighting device comprising a light guide plate with a reflecting member and prisms formed on its surface, where the light guide plate has an incident surface for receiving light and an output surface for emitting light, and the prisms on the opposite surface stepwise from the incident to the end surface, allowing for the separation and control of light distribution in different directions for illumination and design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional planar lighting devices output both illumination light and design light, then the value and functionality of the device is enhanced, but it becomes difficult to control the distribution of the two kinds of light
Solution Approach 1:
The patent divides the light guide plate into multiple functional regions with different prism structures. Specifically, it segments the light guide plate into a first light guide plate region with first prisms for illumination light and a second light guide plate region with second prisms for design light. This segmentation allows independent control of light distribution for each function, resolving the contradiction between enhanced functionality and difficult light distribution control.
Solution Approach 2:
The patent applies different prism configurations to different regions of the light guide plate. The first light guide plate region has first prisms with specific inclination angles optimized for illumination light distribution, while the second light guide plate region has second prisms with different inclination angles optimized for design light distribution. This local quality approach enables each region to perform its specific function effectively, solving the light distribution control problem while maintaining dual functionality.
2Adaptability or versatility
If the light guide plate outputs light in multiple directions for different functions, then both illumination and design light can be provided, but the light distribution control becomes difficult
Solution Approach 1:
The patent segments the light guide plate into distinct regions with different prism structures. The first light guide plate region contains first prisms that output illumination light in a first direction, while the second light guide plate region contains second prisms that output design light in a second direction. This segmentation enables precise control of light distribution in different directions for each function, resolving the contradiction between multi-directional light output capability and light distribution precision.
Solution Approach 2:
The patent implements local quality by configuring different prism structures in different regions. The first prisms in the first light guide plate region have inclination angles specifically designed for illumination light distribution, while the second prisms in the second light guide plate region have inclination angles specifically designed for design light distribution. This region-specific optimization achieves precise light distribution control for each function while maintaining the ability to output light in multiple directions.
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
Enables precise control over light distribution for both illumination and design, enhancing the value and functionality of planar lighting devices by ensuring accurate and efficient output of light patterns and intensity.
Implementation Method 1
The reflecting member faces an end surface opposite to the incident surface of the light guide plate and reflects light leaking from the end surface
Implementation Method 2
The first prisms causes the light reflected by the reflecting member and traveling from the end surface toward the incident surface to be output from the output surface in a first direction as first light and cause the light entering into the incident surface and traveling from the incident surface toward the end surface to be output from the output surface in a second direction different from the first direction as second light
Data Source
AI summary
A planar lighting device according to an embodiment includes a light guide plate and a reflecting member. The light guide plate has an incident surface that receives light output from a light source and an output surface that outputs the light received by the incident surface. The reflecting member faces an end surface opposite to the incident surface of the light guide plate and reflects light leaking from the end surface. A plurality of first prisms are formed on an opposite surface opposite to the output surface-of the light guide plate to be away from the output surface stepwise from the incident surface to the end surface. The first prisms cause the light reflected by the reflecting member and traveling from the end surface toward the incident surface to be output from the output surface in a first direction as first light and cause the light entering into the incident surface and traveling from the incident surface toward the end surface to be output from the output surface in a second direction different from the first direction as second light.