AR Display Module Waveguide Layout Without a Polarizing Beam Splitter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wearable display devices, such as AR glasses, have a large volume due to the use of polarizing beam splitters that split and collimate lights, leading to bulkiness and inefficiency in design.
Innovation Solution
A display module design that includes a light emitting module with a first optical waveguide and a conducting module, utilizing coupled and decoupled structures to efficiently transmit light, combined with a reflective display and polarizer to reduce thickness, and a second optical waveguide to guide light to the eye, along with an eye-tracking assembly for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarizing beam splitter (PBS) is used to split and collimate lights, then the AR image can be formed through optical waveguide, but the volume of the AR glasses increases
Solution Approach 1:
The patent extracts and removes the polarizing beam splitter (PBS) from the optical system. Instead of using PBS to split and collimate lights, the invention uses a reflective display combined with optical waveguides to achieve the same functionality without the bulky PBS component, thereby reducing the overall volume of the AR glasses while maintaining AR image formation capability
Solution Approach 2:
The patent replaces the mechanical/optical PBS-based light splitting and collimating system with a reflective display system. This substitution eliminates the need for PBS and associated optical components, achieving a more compact design that maintains the essential function of forming AR images through optical waveguide transmission
2Productivity
If multiple optical components are used for light splitting and collimation, then light transmission efficiency is improved, but the thickness of the display module increases
Solution Approach 1:
The patent merges multiple optical functions (light splitting, collimation, and display) into an integrated reflective display structure. By combining these functions into a single integrated component rather than using separate optical elements, the design achieves efficient light transmission while reducing the overall thickness of the display module
Solution Approach 2:
The patent transitions from a multi-layer stacked configuration of optical components to a planar integrated reflective display structure. This dimensional reorganization allows light to be efficiently transmitted and manipulated within a thinner profile by utilizing in-plane optical paths rather than requiring multiple stacked layers
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 design reduces the thickness and volume of the display module while enhancing image quality and precision, allowing for a more compact and efficient wearable display device.
Implementation Method 1
a first optical waveguide... for transmitting a first light to the display assembly
Implementation Method 2
a display assembly... configured to reflect the first light to form a second light
Implementation Method 3
a polarizer... configured to transmit the second light to form a third light
Implementation Method 4
a second optical waveguide... configured to receive the third light and guide the third light to be emitted out of the second optical waveguide
Data Source
AI summary
This application provides a display module and a wearable display device, the display module comprises a light emitting module and a conducting module. The light emitting module comprises a display assembly, a first optical waveguide, and a polarizer arranged in sequence in a first direction, the light emitting module further comprises a light emitting unit, the light emitting unit is configured to emit a first light to the first optical waveguide; the first light is transmitted to the display assembly through the first optical waveguide, the display assembly is configured to reflect the first light to form a second light, and the second light passes through the first optical waveguide and the polarizer to form a third light. The conducting module comprises a second optical waveguide. The second optical waveguide is configured to receive the third light and guide the third light to emit the second optical waveguide.