Cofferdam Micro-Lens Array for AR Display Luminance
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Solution Overview
Problem
Current micro diode light-emitting display products, such as Micro-OLEDs and Micro-LEDs, face challenges in achieving high luminance at front viewing angles, which is crucial for applications like augmented reality (AR), and existing solutions like Micro-Lens arrays may not be sufficient to meet these requirements effectively.
Innovation Solution
A display panel design that includes a light-emitting structure array with cofferdam structures and a micro lens array, where the cofferdam structures have a hydrophobic material layer and form cavities for the micro lenses, which are made of solidified liquid material and arranged to enhance luminance by forming convex lens shapes, and optionally incorporates a grating structure array for color filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Micro-Lens arrays are used to improve front viewing angle luminance, then luminance is improved, but device complexity increases
Solution Approach 1:
The patent combines the Micro-Lens array with the cofferdam structure into a single integrated component. The cofferdam structure serves dual purposes: it provides mechanical support/separation for the light-emitting elements and simultaneously forms the cavity that houses the Micro-Lens array, eliminating the need for separate supporting structures and reducing overall device complexity.
Solution Approach 2:
The cofferdam structure is designed to perform multiple functions: it acts as a mechanical support structure, a separation element between adjacent light-emitting structures, a cavity-forming component for the Micro-Lens array, and potentially a protective barrier. This multi-functionality reduces the total number of components needed in the display device.
2Manufacturing precision
If cofferdam structures with lyophobic material layers are used to form cavities for micro lenses, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The lyophobic material layer on the cofferdam structure enables self-alignment and self-positioning of the liquid material during the molding process. The liquid material automatically forms the correct convex lens shape and positions itself precisely within the cavity due to the lyophobic properties, eliminating the need for complex alignment mechanisms or precision positioning steps.
Solution Approach 2:
The patent utilizes the surface energy parameters of materials by incorporating a lyophobic material layer with specific surface properties. This layer creates a surface that repels the liquid material, enabling the liquid to form precise convex shapes with controlled curvature and position, thereby achieving high manufacturing precision through material parameter selection rather than mechanical precision.
3Manufacturing precision
If grating structure arrays are added for color filtering, then manufacturing precision is improved, but ease of manufacture decreases
Solution Approach 1:
The grating structure array is integrated with the cofferdam structure, forming a unified component rather than a separate layer. This integration reduces the total number of manufacturing steps and assembly operations required, as the grating structures and cofferdam structures are formed together or assembled as a single unit, thereby improving ease of manufacture despite the increased precision requirements.
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 panel achieves significantly improved luminance at front viewing angles, with the luminance being approximately 1.6 times that of conventional panels, making it suitable for AR applications with high luminance demands, while also simplifying the preparation process and reducing costs.
Implementation Method 1
the plurality of cofferdam structures each includes a lyophobic material layer; each of the plurality of micro lenses is arranged in a corresponding cavity and arranged at a corresponding lyophobic material layer
Implementation Method 2
a micro lens array, including a plurality of micro lenses in one-to-one correspondence to the plurality of cavities; each of the plurality of micro lenses is arranged in a corresponding cavity and arranged at a corresponding lyophobic material layer; a material of the micro lenses includes a solidified liquid material
Implementation Method 3
the plurality of grating structures are classified into various types of grating structures which are corresponding to the plurality of sub-pixels in various color, respectively, and each type of the grating structure is configured to diffract light and take out light waves of which wavelengths are the same as light exiting wavelength of a corresponding sub-pixel
Data Source
AI summary
The present disclosure provides a display panel, a method for preparing the display panel and a display device. The display panel includes a driving back plate; a light-emitting structure array, arranged on the driving back plate and includes light-emitting structures in one-to-one correspondence to sub-pixels; cofferdam structures, configured to form cavities in one-to-one correspondence to the light-emitting structures; where each cofferdam structure is arranged between respective one pair of two adjacent light-emitting structures, and the each cofferdam structure includes a lyophobic material layer; and a micro lens array, including micro lenses in one-to-one correspondence to the cavities; where the micro lens array is arranged on a side, facing away from the driving back plate, of the light-emitting structure array, each micro lens is arranged in a corresponding cavity and arranged at a corresponding lyophobic material layer, and a material of the micro lenses includes a solidified liquid material.