AR Display Light Guide Unit for Thickness and Luminance Trade-off
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Solution Overview
Problem
Conventional augmented reality display devices face limitations in reducing overall thickness while maintaining high luminance, particularly when using projectors, which leads to light loss and inefficiencies in light guidance.
Innovation Solution
The implementation of a display device with a light guide unit that includes input diffraction regions to change the traveling direction of display light beams, a light guide region to guide them, and an output diffraction region to direct them to a predetermined direction, utilizing multiple waveguides and diffraction patterns to enhance light efficiency and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a projector is provided in the augmented reality display device to provide high-luminance light, then the luminance is improved, but the overall thickness cannot be reduced
Solution Approach 1:
The patent extracts the projector from the system by using display units that directly generate display light beams, eliminating the need for a separate projector component and thereby reducing the overall thickness of the augmented reality display device while maintaining luminance output
Solution Approach 2:
The patent introduces a light guide unit as an intermediary component that receives display light beams from display units and guides them through diffraction regions, enabling direct light generation from display units while maintaining efficient light delivery to the user's eyes
2Productivity
If a projector is employed to provide images and information, then the desired image provision is achieved, but light loss occurs and light guidance efficiency is reduced
Solution Approach 1:
The light guide unit serves as an intermediary that efficiently transfers light from display units to the user's eyes through controlled diffraction, minimizing light loss compared to projector-based systems that require multiple optical components
Solution Approach 2:
The patent replaces the mechanical projector system with an optical diffraction-based light guide system, using diffraction patterns to control light direction and reduce light loss while maintaining image provision functionality
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 minimizes light loss and enhances the overall luminance of the augmented reality display device, achieving higher luminance and resolution while maintaining a simple structure and reduced thickness.
Implementation Method 1
the light guide unit includes a plurality of input diffraction regions which changes traveling directions of the display light beams
Implementation Method 2
The input light is reflected internally in the waveguide
Implementation Method 3
an output diffraction region which directs the guided display light beams to a predetermined direction
Data Source
AI summary
A display device includes a display panel and a light guide unit. The display panel includes a plurality of display units, and the plurality of display units generates a plurality of display light beams with different wavelengths, respectively. The light guide unit receives the display light beams from the plurality of display units. The light guide unit includes a plurality of input diffraction regions which change traveling directions of the display light beams, respectively, a light guide region that guides the display light beams with the changed traveling directions, and an output diffraction region which directs the guided display light beams to a predetermined direction.