Holographic Polarization Optics for Compact Head-Mounted Displays
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Solution Overview
Problem
Existing head-mounted displays for virtual reality (VR) struggle with inefficient light utilization and bulkiness, leading to reduced image quality and user comfort.
Innovation Solution
A display device configuration comprising a display panel emitting linearly polarized light, a holographic element reflecting specific angles, a retardation film, a transflective element, and a lens element to enhance light condensation and efficiency, while minimizing thickness and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional optical systems are used in head-mounted displays, then the device can provide basic display functionality, but light use efficiency is poor and image quality is reduced
Solution Approach 1:
The optical system is divided into multiple functional elements: a first optical element for condensing light from the display panel, a second optical element for further light condensation, and a third optical element for final light direction control. This segmentation allows each element to optimize specific aspects of light manipulation, achieving nearly 100% light condensation to the user's eyes while maintaining compact form factor.
2Use of energy by moving object
If the optical system is made more complex to improve light condensation, then light use efficiency improves, but device thickness and weight increase
Solution Approach 1:
The patent employs thin-film optical elements and a compact multi-element optical system that achieves high light condensation efficiency without requiring bulky components. The optical system is integrated within a compact housing, minimizing the overall device thickness and weight while maintaining nearly 100% light condensation performance.
3Device complexity
If conventional optical systems are used, then the device structure is simpler, but light condensation efficiency is low
Solution Approach 1:
The optical system is divided into multiple functional elements: a first optical element for condensing light from the display panel, a second optical element for further light condensation, and a third optical element for final light direction control. This segmentation allows each element to optimize specific aspects of light manipulation, achieving nearly 100% light condensation to the user's eyes while maintaining compact form factor.
4Volume of moving object
If the display device is made more compact to improve user comfort, then device size decreases, but light condensation efficiency is reduced
Solution Approach 1:
The optical system is divided into multiple functional elements: a first optical element for condensing light from the display panel, a second optical element for further light condensation, and a third optical element for final light direction control. This segmentation allows each element to optimize specific aspects of light manipulation, achieving nearly 100% light condensation to the user's eyes while maintaining compact form factor.
Solution Approach 2:
The patent employs thin-film optical elements and a compact multi-element optical system that achieves high light condensation efficiency without requiring bulky components. The optical system is integrated within a compact housing, minimizing the overall device thickness and weight while maintaining nearly 100% light condensation performance.
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
The solution achieves nearly 100% light condensation to the user's eyes, improving light use efficiency and reducing device thickness and weight, thereby enhancing VR image quality and user comfort.
Implementation Method 1
a display panel including a polarizer and comprising a display area configured to emit display light which is linearly polarized light
Implementation Method 2
a holographic element which reflects light having a specific incident angle and transmits light having an incident angle different from the specific incident angle
Implementation Method 3
a retardation film provided between the display panel and the holographic element
Implementation Method 4
a transflective element which faces the holographic element across an intervening space, reflects, of the light which passed through the holographic element, first circularly polarized light, and transmits second circularly polarized light rotating in an opposite direction of the first circularly polarized light
Implementation Method 5
a lens element which faces the transflective element and has a lens effect of condensing the second circularly polarized light which passed through the transflective element
Data Source
AI summary
According to one embodiment, a display device includes a display panel, a holographic element which reflects light having a specific incident angle and transmits light having an incident angle different from the specific incident angle, a retardation film provided between the display panel and the holographic element, a transflective element which reflects, of the light which passed through the holographic element, first circularly polarized light, and transmits second circularly polarized light rotating in an opposite direction of the first circularly polarized light, and a lens element which has a lens effect of condensing the second circularly polarized light which passed through the transflective element.