Folded Optical Layout for Compact VR Near-Eye Display
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Solution Overview
Problem
Conventional VR near-eye display products are large due to the display screen being far away from the lens, hindering miniaturization.
Innovation Solution
A display device with a specific optical arrangement including a display screen, polarizers, quarter-wave plates, lenses, and a transflective film that folds the light path for multiple reflections and refractions, allowing for a reduced distance between the screen and lens, and enables non-overlapping dual image planes for 3D display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-piece lens is used in the optical system, then the structure is simple, but the display screen must be far away from the lens due to imaging requirements, resulting in a larger device size
Solution Approach 1:
The patent divides the optical system into multiple components: a lens assembly, a light splitting sheet, and multiple display screens arranged at different positions. The light splitting sheet separates the optical path into different segments, allowing each component to be optimized independently while reducing the overall distance between the main display screen and the lens.
Solution Approach 2:
The patent introduces a light splitting sheet that creates multiple optical paths in different spatial dimensions. By arranging display screens at different positions and angles, the system folds the optical path, effectively reducing the linear distance between the display screen and lens while maintaining the required imaging characteristics.
2Reliability
If the display screen is placed far from the lens to meet imaging requirements, then the imaging quality is ensured, but the VR near-eye display product size becomes large
Solution Approach 1:
The patent arranges multiple display screens and optical components in a nested configuration where components are positioned within the space created by other components. The light splitting sheet and additional display screens are integrated into the existing optical path, allowing the system to maintain imaging quality while compacting the overall device volume.
Solution Approach 2:
By introducing multiple display screens positioned at different spatial locations and using the light splitting sheet to create divergent optical paths, the system maintains the effective imaging distance while reducing the physical footprint of the device. This multi-dimensional arrangement allows compact packaging without sacrificing imaging quality.
3Length of stationary object
If multiple display screens and light splitting sheets are arranged in sequence, then the device size is reduced, but the light path becomes more complex with multiple reflections and refractions
Solution Approach 1:
The light splitting sheet acts as an intermediary component that manages the complexity of the optical path. It systematically divides and directs light to multiple display screens and back to the lens, providing a structured approach to handling multiple reflections and refractions. This intermediary component simplifies the overall system architecture by centralizing the light path management function.
4Volume of stationary object
If the light path is folded with multiple reflections and refractions, then the effective optical path is increased and device size is reduced, but the alignment precision of optical components becomes more difficult to maintain
Solution Approach 1:
The patent integrates multiple optical components (display screens, light splitting sheet, lens) into a unified assembly where the optical paths are pre-aligned during manufacturing. By combining these components into a single integrated unit, the system reduces the cumulative alignment errors that would occur with separate, independently aligned components. The integrated design allows for centralized alignment calibration, improving manufacturing precision despite the folded optical path.
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 miniaturization of VR near-eye display products and enhances stereoscopic display by allowing two non-overlapping virtual images, providing a clearer 3D imaging experience.
Implementation Method 1
a first polarizer arranged on a light-emitting surface of the display screen
Implementation Method 2
a direction of a light transmission axis of the light splitting sheet is consistent with a direction of a light transmission axis of the first polarizer
Implementation Method 3
a first quarter-wave plate arranged on a side of the light splitting sheet away from the first polarizer
Implementation Method 4
a first lens arranged on a side of the first quarter-wave plate away from the light splitting sheet
Implementation Method 5
a transflective film arranged on a side of the first lens away from the first quarter-wave plate
Data Source
AI summary
A display device is provided, including a display screen; a first polarizer arranged on a light-emitting surface of the display screen; a light splitting sheet arranged on a side of the first polarizer away from the display screen, wherein a direction of a light transmission axis of the light splitting sheet is consistent with a direction of a light transmission axis of the first polarizer; a first quarter-wave plate arranged on a side of the light splitting sheet away from the first polarizer; a first lens arranged on a side of the first quarter-wave plate away from the light splitting sheet; and a transflective film arranged on a side of the first lens away from the first quarter-wave plate.