Light Guide Sheet Layout for Selective Display Emission Angles
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Solution Overview
Problem
Existing illumination devices struggle to selectively restrict the emission angle range of some emission light while allowing unrestricted emission for others, as seen in US 2017/0069236 A.
Innovation Solution
The illumination device incorporates a first and second light guide plate with light sources and an optical member, featuring light blocking and transmitting portions, and reflection portions to control light emission angles, along with a light source control unit to switch modes, ensuring selective emission angle restriction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single light guide plate with uniform structure is used, then the device structure is simple, but it is not possible to selectively restrict the emission angle range for some emission light while allowing unrestricted emission for other emission light
Solution Approach 1:
The illumination device is divided into multiple light guide plates (first light guide plate and second light guide plate) with different optical structures. Each light guide plate has light blocking portions and light transmitting portions arranged in specific patterns, allowing different regions to control light emission independently. This segmentation enables selective emission angle restriction for different light sources while maintaining overall system functionality.
Solution Approach 2:
Different regions of the light guide plates are designed with different optical properties. Specifically, light blocking portions are positioned to restrict emission angles for certain light sources (first and second light sources) while light transmitting portions allow unrestricted emission for other light sources (third light source). This local differentiation of optical characteristics enables selective control without requiring complete structural redesign of the entire illumination system.
2Manufacturing precision
If light blocking portions are added to restrict emission angles, then emission angle control is improved, but light transmission efficiency decreases due to blocked light paths
Solution Approach 1:
Light reflecting portions are introduced as intermediary elements between the light sources and the external environment. These reflecting portions redirect light that would otherwise be blocked by the light blocking portions, converting potentially wasted light into useful emission. The light reflecting portions work in conjunction with the light blocking portions to achieve precise emission angle control while minimizing light energy loss through strategic light redirection.
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 allows for the selective restriction of emission angles, enhancing display visibility and reducing unwanted light dispersion, thereby improving display clarity and efficiency.
Implementation Method 1
two first light blocking portions disposed with an interval therebetween in a first direction and configured to block light
Implementation Method 2
a first light-transmitting portion disposed between the two light blocking portions and configured to transmit light
Implementation Method 3
A first light reflection portion is provided at the second main surface, the first light reflection portion reflecting light and promoting light emission from the first main surface
Implementation Method 4
A second light reflection portion is provided at the fourth main surface, the second light reflection portion reflecting light and promoting light emission from the third main surface
Data Source
AI summary
An illumination device is provided with a first light source, a first light guide plate including a second main surface, a second light source, a second light guide plate including a fourth main surface, a third light source, an optical member, and a first sheet. The main surfaces of the first light guide plate and the second light guide plate overlap each other and the first light guide plate and the second light guide plate are disposed on the opposite side of the first sheet from the optical member. The first sheet includes two first light blocking portions and a first light-transmitting portion. The first light reflection portion is selectively provided in a first region in the first opposite main surface, and the second light reflection portion is provided at least in a fourth region in the second opposite main surface.