Polarized Light Emitting Element for Uniform Display Luminance
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Solution Overview
Problem
Existing light emitting elements face challenges in achieving high luminance and uniform light distribution due to polarization efficiency issues and substrate limitations, leading to luminance unevenness in projected images.
Innovation Solution
A light emitting element with a polarizer layer having regions that allow specific polarization components to pass through or reflect, combined with a wave plate layer having regions with perpendicular optical axes, which ensures consistent polarization and improved light distribution symmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light emitting element is used, then the structure is simple, but the polarization efficiency is low and luminance is insufficient
Solution Approach 1:
The light emitting element is segmented into multiple functional layers: an active layer for light generation, a polarizer layer with first and second regions for polarization separation, a wave plate layer with third and fourth regions for polarization conversion, and a reflective layer. This segmentation allows each layer to perform its specific function, achieving high polarization efficiency and luminance while maintaining a structured and organized design.
Solution Approach 2:
The polarizer layer and wave plate layer act as intermediary components between the active layer and the output. The polarizer layer separates polarization components, and the wave plate layer converts polarization states, mediating the transformation from unpolarized light to linearly polarized light with high efficiency, thereby increasing luminance without excessive structural complexity.
2Illumination intensity
If the area of the light emitting element is increased to increase luminance, then the luminance increases, but the etendue increases and optical efficiency decreases
Solution Approach 1:
The invention changes the polarization state parameter of the emitted light from unpolarized to linearly polarized. By using the polarizer layer and wave plate layer to convert the polarization state, the etendue is reduced without increasing the physical area of the light emitting element. This parameter change allows luminance to increase while maintaining high optical efficiency and avoiding energy loss.
3Illumination intensity
If a simple polarizer layer is used, then the structure is simple, but the light intensity distribution is non-uniform causing luminance unevenness
Solution Approach 1:
The wave plate layer is segmented into a third region and a fourth region with perpendicular optical axes. The third region receives light from the first region of the polarizer layer, and the fourth region receives light from the second region. This segmentation ensures that light intensity distribution becomes uniform in all directions, eliminating luminance unevenness while maintaining a structured layer design.
Solution Approach 2:
Different regions of the wave plate layer have different optical axis orientations (perpendicular to each other). The third region has an optical axis oriented in one direction, while the fourth region has an optical axis oriented perpendicular to the first. This local quality variation in different regions ensures uniform light intensity distribution across the entire output, resolving the luminance unevenness problem.
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 luminance by optimizing polarization efficiency and achieves uniform light intensity distribution on screens, reducing luminance unevenness in image display applications.
Implementation Method 1
a polarizer layer having a first region that allows a polarization component in a first direction in the light produced in the active layer to pass therethrough and reflects other polarization components, and a second region that allows a polarization component in a second direction perpendicular to the first direction to pass therethrough and reflects other polarization components
Implementation Method 2
a wave plate layer having a third region and a fifth region that the light exiting from the first region enters, and a fourth region and a sixth region that the light exiting from the second region enters, the wave plate layer causing the lights that have entered the third to sixth regions to exit as lights in the same polarized state
Implementation Method 3
a reflective layer that reflects the lights reflected by the first and second regions
Data Source
AI summary
The light emitting element includes and active layer that produces light; a polarizer layer having a first region that allows a polarization component in a first direction in the light produced in the active layer to pass through and reflects other polarization components, and a second region that allows a polarization component in a second direction perpendicular to the first direction to pass through and reflects other polarization components; a wave plate layer having a third region and a fifth region that the light exiting from the first region enters, and a fourth region and a sixth region that the light exiting from the second region enters, the wave plate layer causing the lights that have entered the third to sixth regions to exit as lights in the same polarized state; and a reflective layer that reflects the lights reflected by the first region and the second region. The directions of optical axes of the third region and the fifth region, or the fourth region and the sixth region, are perpendicular to each other.