VR Display Assembly With Light-Converging Layer for OLED Brightness
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Solution Overview
Problem
Silicon-based OLEDs exhibit relatively low brightness, making them unsuitable for high-brightness applications in augmented reality (AR) products.
Innovation Solution
A display assembly is designed with a light converging layer comprising lenses that converge light emitted by an electroluminescent element, increasing brightness within a central viewing angle of ±9°, which meets the requirements of virtual reality display devices using optical waveguides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch sensor is disposed between the display window and the user's eye in VR devices, then interaction convenience is improved, but optical interference with the display image occurs
Solution Approach 1:
A reflective layer is introduced as an intermediary component between the touch sensor and the display window. This reflective layer redirects light that would otherwise be absorbed or scattered by the touch sensor, thereby maintaining touch sensitivity and interaction convenience while reducing optical interference with the display image quality
Solution Approach 2:
The patent addresses the two-dimensional conflict between touch sensor functionality and optical clarity by introducing a third dimensional element - the reflective layer positioned at a specific depth within the layered structure. This spatial arrangement allows both the touch sensor and display to function optimally without direct optical interference
2Device complexity
If the number of layers in the display assembly is reduced, then device complexity is decreased, but manufacturing precision requirements increase
Solution Approach 1:
The patent combines multiple functions into integrated components. For example, the touch sensor assembly is integrated directly with the display assembly, and the reflective layer serves both optical enhancement and structural positioning functions. This merging reduces the total number of separate layers while maintaining precise functional relationships through careful design of the integrated structures
Solution Approach 2:
Certain layers and components are designed to perform multiple functions simultaneously. The reflective layer, for instance, serves both to enhance display brightness and to provide a structural reference for aligning other components. This multi-functionality reduces the need for separate dedicated layers, thereby simplifying the overall structure while maintaining manufacturing precision
Data Source
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Figure 3
AI summary
The preset disclosure provides a display assembly and a virtual reality display device. The display assembly includes an electroluminescent element, a packaging layer and a light converging layer arranged sequentially. The light converging layer is configured to converge light emitted by the electroluminescent element and transmitted through the packaging layer. The electroluminescent element includes a plurality of pixels, the light converging layer is tightly attached to the packaging layer, and an orthogonal projection of each pixel onto a surface of the packaging layer to which the light converging layer is tightly attached is completely covered by the light converging layer.