Display Lens Array Geometry for Higher Luminance
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Solution Overview
Problem
Display devices struggle to achieve high luminance and efficient light output for applications like Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR), necessitating improvements in light management and emission efficiency.
Innovation Solution
A display device design incorporating a lens array with specific geometric configurations, including trapezoidal, isosceles trapezoidal, semicircular, and hexagonal shapes, positioned to optimize light emission and distribution, enhancing the optical functional layer with a color filter layer and encapsulation structure to manage light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional display device structure is used, then the device complexity is low, but the output light amount and luminance are insufficient
Solution Approach 1:
The display device is segmented into multiple functional layers including pixel circuit layer, light emitting element layer, encapsulation layer, and optical functional layer. Each layer performs a specific function to collectively achieve high luminance while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces a vertical stacking dimension by positioning the lens array above the light emitting elements at optimized heights. This three-dimensional arrangement allows light to be emitted and focused more effectively, increasing luminance without significantly increasing planar device complexity.
2Productivity
If the lens height is increased to improve light output, then the light emission efficiency increases, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent optimizes specific geometric parameters of the lens including height, radius of curvature, and position relative to the light emitting element. By carefully selecting these parameters (e.g., lens height between 10-50 micrometers), the patent achieves high light output while keeping the lens structure manufacturable with existing fabrication techniques.
Solution Approach 2:
The lens height is set to a specific optimized value that provides sufficient light focusing capability without being excessively tall. This partial optimization approach achieves the necessary light output improvement while avoiding the manufacturing complexities that would arise from much larger lens dimensions.
3Illumination intensity
If the lens array is added to enhance light distribution, then the luminance improves, but the device complexity increases
Solution Approach 1:
The optical functional layer serves multiple functions: it houses the lens array for light focusing, includes color filter layers for wavelength selection, and provides structural support. This multi-functionality allows the patent to achieve improved luminance and color performance without adding separate dedicated components for each function, thereby limiting the increase in device complexity.
4Area of stationary object
If the gap length between openings is reduced to increase pixel density, then the area utilization improves, but the light emission efficiency decreases
Solution Approach 1:
The patent applies different gap lengths in different regions or for different pixel types within the display. By locally optimizing the gap length based on specific performance requirements, the patent can maintain high pixel density in some areas while preserving adequate light emission efficiency in others, resolving the contradiction between these two parameters.
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 significantly increases light output and luminance, improving display performance for AR, VR, and MR applications by enhancing light emission efficiency and distribution.
Implementation Method 1
an optical functional layer on the encapsulation layer, the optical function layer including a lens corresponding to each of the plurality of sub-pixels
Data Source
AI summary
A display device includes: a substrate; a pixel circuit layer including circuit elements of each of a plurality of sub-pixels, the pixel circuit layer being on the substrate; a light emitting element layer on the pixel circuit layer, the light emitting element layer including a pixel defining layer defining an opening; an encapsulation layer on the light emitting element layer; and an optical functional layer on the encapsulation layer, the optical function layer including a lens corresponding to each of the plurality of sub-pixels, wherein a first length between a top surface of the lens and a top surface of the encapsulation layer is a sum of a half of a gap length and an emission length, wherein the gap length is a width of the pixel defining layer between openings respectively corresponding to the plurality of sub-pixels, and wherein the emission length is a width of the opening.