Polarized Reflection Layer Layout for Compact Light-Efficient Displays
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Solution Overview
Problem
Existing display and imaging apparatuses face inefficiencies in light utilization due to the use of half mirrors, which cause unnecessary reflection and transmission, leading to reduced light reaching the user's eyes or imaging sensor, especially when trying to minimize the distance between the display/imaging element and the lens.
Innovation Solution
Incorporating a reflection layer with specific light transmission and reflection regions, along with polarization and wave plates, to optimize light path length and reduce the actual distance between the display/imaging element and the lens, eliminating the need for half mirrors and enhancing light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a half mirror is used to reflect light between the display element and the lens, then the actual distance between the display element and the lens can be reduced while the optical distance corresponding to the focal length is secured, but the light use efficiency decreases due to unnecessary reflection and transmission
Solution Approach 1:
The reflection layer is divided into multiple regions: a first reflection region that reflects light from the first polarization plate, a second reflection region that reflects light from the second polarization plate, and a light transmission region that allows light to pass through. This segmentation enables selective reflection and transmission of light from different polarization plates, improving light use efficiency while maintaining a compact structure.
Solution Approach 2:
Different regions of the reflection layer have different optical properties: the first reflection region has high reflectivity for light from the first polarization plate, the second reflection region has high reflectivity for light from the second polarization plate, and the light transmission region has high transmittance. This local differentiation of optical properties optimizes light control and efficiency in each specific area.
2Length of stationary object
If a half mirror is used in the imaging apparatus to reduce the distance between the imaging element and the lens, then the thickness of the imaging apparatus is reduced, but unnecessary reflection and transmission occur causing light loss
Solution Approach 1:
The reflection layer is segmented into a first reflection region for reflecting light from the first polarization plate, a second reflection region for reflecting light from the second polarization plate, and a light transmission region for transmitting light. This segmentation eliminates unnecessary reflection and transmission, improving light transmission efficiency while maintaining a thin profile.
Solution Approach 2:
The reflection layer exhibits different optical properties in different regions: high reflectivity in the first and second reflection regions, and high transmittance in the light transmission region. This local quality differentiation optimizes light control for each function while reducing overall apparatus thickness.
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 improves light use efficiency by ensuring that light is effectively transmitted to the user's eyes or imaging sensor while maintaining the necessary optical path length, reducing ghost light and enhancing the overall performance of the display/imaging apparatus.
Implementation Method 1
a first polarization plate, configured to polarize light in a first direction
Implementation Method 2
a first wave plate, configured to convert the polarized light into circularly polarized light
Implementation Method 3
a reflection layer including a reflection region, configured to reflect the circularly polarized light
Implementation Method 4
a second wave plate, configured to convert the circularly polarized light into linearly polarized light
Implementation Method 5
a second polarization plate, configured to polarize light in a second direction perpendicular to the first direction
Data Source
AI summary
In a display apparatus body (10A), a first polarization plate (31), a first wave plate (32), a reflection layer (33), a second wave plate (35), and a second polarization plate (36) are arranged between a display element (De) and a lens (S) and are lined up in this order from the display element (De) toward the lens (S). Further, the reflection layer (33) includes reflection regions (E1) that correspond to positions of non-light emission regions (R2) of the display element (De) and that reflect light and includes light transmission regions (E2) that correspond to positions of a plurality of light emission regions (R1) and that transmit light. This can obtain a display apparatus that can improve the use efficiency of light emitted from a display element.