Polarized Light Bending Backlight for Uniform Emission
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Solution Overview
Problem
Conventional backlights for display devices that use polarized light face challenges in reducing size due to the need for optical systems to align light axes and achieving uniform surface emission, as polarized light mixing within the lightguide plate results in uneven light distribution and reduced luminous efficiency.
Innovation Solution
A light-emitting device comprising a light source unit that emits polarized light, a bending portion that redirects the light, and a lightguide member that further bends and emits the light, allowing for the mixing of colors within the lightguide member without external optical alignment, thereby eliminating the need for additional optical elements and enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If polarized light from multiple light sources directly enters the lightguide plate without external alignment, then the device complexity is reduced and size is minimized, but the surface emission uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-aligning the optical axes of multiple laser light sources before they enter the lightguide plate. This is achieved through optical elements positioned at specific locations that redirect and align the polarized light from each light source along a common optical axis, ensuring uniform surface emission while maintaining a compact structure without requiring complex external alignment systems.
2Manufacturing precision
If optical elements are added to align light axes before reaching the lightguide plate, then surface emission uniformity is improved, but the backlight size and complexity increase
Solution Approach 1:
The patent utilizes another dimension by arranging multiple laser light sources and optical elements in a stacked configuration along the thickness direction (vertical dimension) rather than spreading them out horizontally. This allows the optical alignment system to be compact in the planar dimensions while maintaining proper alignment functionality, effectively reducing the overall backlight size without compromising surface emission uniformity.
3Device complexity
If polarized light is mixed within the lightguide plate, then the device structure is simplified, but luminous efficiency decreases due to light absorption
Solution Approach 1:
The patent applies preliminary action by pre-aligning the optical axes of multiple laser light sources before they enter the lightguide plate. This is achieved through optical elements positioned at specific locations that redirect and align the polarized light from each light source along a common optical axis, ensuring uniform surface emission while maintaining a compact structure without requiring complex external alignment systems.
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 thinner and more efficient backlight with improved luminous efficiency by mixing colors within the lightguide member, reducing the size of the backlight and minimizing light absorption, while maintaining polarized light emission for display devices.
Implementation Method 1
a bending portion which is irradiated with the polarized light in the first direction and bends the polarized light such that the polarized light goes in a second direction intersecting with the first direction, and a lightguide member which is irradiated with the polarized light caused to bend in the bending portion, bends the polarized light such that the polarized light goes in a third direction
Data Source
AI summary
In one embodiment, a light-emitting device includes a light source unit which emits polarized light in a first direction, a bending portion which is irradiated with the polarized light in the first direction and bends the light in a second direction, and a lightguide member which is irradiated with the polarized light caused to bend in the bending portion. The lightguide member comprises an exit surface, bends the polarized light in a third direction, and emits the light through the exit surface. The light source unit includes a first source which emits first light, and a second source which emits second light. The bending portion includes a first incident portion which the first light enters, and a second incident portion which the second light enters.