Tilted Light Guide for Thin Illumination
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Solution Overview
Problem
The demand for thinner liquid crystal display devices has increased, necessitating the downsizing of illumination devices while maintaining effective light distribution.
Innovation Solution
The illumination device incorporates a light guide with specific planes and a light emitting device with multiple light emitting parts, each emitting light of different wavelengths. The light guide's tilted planes and reflective layers ensure total internal reflection and efficient light propagation, allowing for a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the illumination device is thinned to meet demand for thinner liquid crystal display devices, then the device thickness is reduced, but light distribution effectiveness deteriorates
Solution Approach 1:
The light guide includes a tilted plane that redirects light in a different spatial dimension, allowing efficient light distribution within a thinner device profile. The tilted plane changes the propagation direction of light from the light emitting device, enabling effective illumination without increasing device thickness.
Solution Approach 2:
The light guide structure incorporates a localized tilted plane region that specifically addresses light distribution needs. This tilted plane is positioned at a specific location within the light guide to optimize light redirection, while other regions maintain their original structure, allowing the device to remain thin overall while achieving effective light distribution in critical areas.
2Volume of moving object
If the light guide thickness is reduced to downsize the illumination device, then device compactness is improved, but light propagation efficiency deteriorates
Solution Approach 1:
The tilted plane redirects light propagation into a different dimensional path, allowing light to travel effectively through the thinned light guide. This angular redirection compensates for the reduced thickness by changing the light's spatial trajectory, maintaining propagation efficiency despite the compact volume.
Solution Approach 2:
The tilted plane creates an angular interface that redirects light in a curved or angled path rather than a straight line. This angular geometry helps maintain light propagation efficiency by directing light away from total internal reflection conditions that would occur in a purely planar, thin light guide structure.
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 the illumination device to be downsized without compromising light distribution, as the light guide's geometry and reflective layers ensure efficient mixing and propagation of light, even with reduced thickness.
Implementation Method 1
The light guide includes a first plane, a second plane opposed to the first plane and substantially parallel to the first plane, and a tilted plane opposed to the first plane and tilted to the first plane
Data Source
AI summary
According to an embodiment, an illumination device includes a light guide having a first plane, a second plane opposed to the first plane and substantially parallel to the first plane, and a tilted plane opposed to the first plane and tilted to the first plane, the tilted plane and the second plane being arranged in a first direction, and a light emitting device including a first light emitting part, a second light emitting part, and a third light emitting part which are located directly below the tilted plane, arranged in the first direction, and configured to emit light having wavelengths different from each other.