OLED Display Assembly With Light-Converging Layer for AR Brightness
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Solution Overview
Problem
Silicon-based Organic Light-Emitting Diodes (OLEDs) have relatively low brightness, making it difficult to meet the high brightness requirements of Augmented Reality (AR) products.
Innovation Solution
A display assembly is designed with an electroluminescent element, a packaging layer, and a light converging layer arranged sequentially. The light converging layer, which includes a plurality of lenses corresponding to each pixel, converges light emitted by the electroluminescent element to increase brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an optical waveguide technique is used for AR products, then the product becomes thinner and lighter, but optical loss increases
Solution Approach 1:
The patent changes the optical parameters by introducing a light converging layer with specific refractive index (n2) between the electroluminescent element and optical waveguide. This parameter modification optimizes light coupling efficiency and reduces optical loss while maintaining the thin-profile requirement for AR products.
2Weight of moving object
If silicon-based OLED is used for AR products, then portability is improved, but brightness is insufficient
Solution Approach 1:
The patent creates a composite structure combining silicon-based OLED with a light converging layer and optical waveguide. This composite material system leverages the lightweight advantage of silicon-based OLED while compensating for its low brightness through optical enhancement layers, achieving both portability and sufficient brightness for AR applications.
3Illumination intensity
If a light converging layer is added to increase brightness, then brightness requirement is met, but device complexity increases
Solution Approach 1:
The patent segments the display system into distinct functional layers: electroluminescent element layer, packaging layer, light converging layer, and optical waveguide layer. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall system simplicity through modular architecture.
Solution Approach 2:
The light converging layer serves multiple functions simultaneously: it converges light to increase brightness, couples light into the optical waveguide efficiently, and maintains mechanical integration between layers. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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 display assembly effectively increases the brightness of light within a certain range, meeting the high brightness requirements of AR products and enabling the use of silicon-based OLEDs in virtual reality display devices.
Implementation Method 1
The light converging layer is configured to converge light emitted by the electroluminescent element and transmitted through the packaging layer
Implementation Method 2
a refractive index of the third protection layer, a refractive index of each lens and a refractive index of the second protection layer meet the following formulae
Data Source
AI summary
The present 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 pixels onto a surface of the packaging layer to which the light converging layer is tightly attached is completely covered by the light converging layer.