Illumination Device With Inclined Light Guide And P-Polarized Source
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Solution Overview
Problem
Conventional illumination devices suffer from reduced emission efficiency due to light escaping from the light guide before being emitted, leading to decreased luminance and non-uniformity in display devices.
Innovation Solution
The illumination device employs a configuration where the side surfaces of the light guides are inclined relative to the main and opposed surfaces, and the light sources emit P-polarized light at specific angles to minimize reflectance at the air-light guide interface, ensuring efficient light propagation and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light is emitted from the light guide, then luminance is provided, but light escapes from the light guide before emission causing decreased emission efficiency
Solution Approach 1:
The patent applies parameter changes by inclining the side surfaces of the light guide at specific angles (45 degrees or 60 degrees relative to the main surface) to optimize light propagation. This geometric parameter modification reduces light escape and improves emission efficiency while maintaining luminance output.
Solution Approach 2:
The patent employs composite material structures by combining the light guide with specific optical films and reflective layers. This composite structure manages light propagation more effectively, reducing premature light escape and improving overall emission efficiency.
2Device complexity
If conventional light guides are used, then simple structure is maintained, but light distribution uniformity deteriorates causing stripe-shaped non-uniformities
Solution Approach 1:
The patent modifies the geometric parameters of the light guide by inclining side surfaces at specific angles (45 or 60 degrees). This parameter change improves light distribution uniformity and eliminates stripe-shaped non-uniformities while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent introduces a dimensional change by inclining the side surfaces of the light guide, adding an angular dimension to the previously planar structure. This dimensional modification improves light distribution uniformity across the display surface.
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 enhances emission efficiency and uniformity of light distribution, improving the overall display quality by reducing light loss and stripe-shaped non-uniformities.
Implementation Method 1
a first light source opposed to the first side surface to emit first P-polarized light to the first side surface
Implementation Method 2
the side surfaces of the light guides are inclined relative to the main and opposed surfaces, and the light sources emit P-polarized light at specific angles to minimize reflectance at the air-light guide interface
Implementation Method 3
The light from the light source is made incident on the light guide from a side surface of the light guide, propagates the inside of the light guide
Implementation Method 4
The light from the light source is made incident on the light guide from a side surface of the light guide, propagates the inside of the light guide
Data Source
AI summary
According to one embodiment, an illumination device includes a first light guide having a first side surface, a second side surface located on a side opposite to the first side surface in a first direction, a first main surface, and a first opposed surface located on a side opposite to the first main surface in a second direction intersecting the first direction and a first light source opposed to the first side surface to emit first P-polarized light to the first side surface, the first side surface is inclined to the first main surface and the first opposed surface, the first light source is inclined to a first straight line perpendicular to the first side surface.