Display Microlens Structure for High-Resolution Color Separation
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Solution Overview
Problem
High-resolution displays in head-mounted devices face issues with color mixing and inefficient light emission due to dense sub-pixel spacing, leading to reduced luminance and increased thickness.
Innovation Solution
A display apparatus with microlenses arranged between hydrophobic banks to improve optical paths and prevent color mixing, featuring lenses with varying shapes and heights for each sub-pixel to enhance light extraction and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sub-pixels are densely spaced to achieve high resolution, then display resolution is improved, but color mixing occurs between adjacent sub-pixels
Solution Approach 1:
The patent introduces microlenses as intermediary optical elements positioned between adjacent sub-pixels. These microlenses act as mediators that redirect and confine light from each sub-pixel, preventing light from spilling into adjacent sub-pixel regions. The microlenses are formed on the encapsulation film and have refractive indices different from the surrounding materials, creating optical boundaries that maintain color purity while allowing dense sub-pixel spacing for high resolution displays.
2Ease of manufacture
If conventional flat encapsulation structure is used, then manufacturing is simple, but light emission efficiency is reduced due to total internal reflection
Solution Approach 1:
The patent applies spherical curvature to the encapsulation structure by forming microlenses on the encapsulation film. These microlenses have convex spherical surfaces with specific radii of curvature that are optimized to extract light efficiently. The curved surfaces of the microlenses change the angle of light propagation, allowing light that would normally undergo total internal reflection at flat interfaces to be redirected toward the viewer, thereby significantly improving light emission efficiency while maintaining manufacturing feasibility through photolithography and reflow processes.
3Illumination intensity
If additional optical components are added to improve light extraction, then luminance is improved, but device thickness increases
Solution Approach 1:
The patent merges the encapsulation function with the light extraction function by integrating microlenses directly onto the encapsulation film. This combination eliminates the need for separate bulk microlens arrays or additional optical layers that would increase device thickness. The microlenses are formed as thin-film structures on the encapsulation film surface, achieving effective light extraction and enhanced luminance while maintaining a compact, thin display device profile suitable for head-mounted displays.
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 solution effectively prevents color mixing, increases optical luminance, and reduces the overall thickness of the display apparatus by optimizing light emission and structural design.
Implementation Method 1
a plurality of lenses disposed between the light emitting element and the encapsulation film
Implementation Method 2
arranging microlenses between hydrophobic banks to improve an optical path
Data Source
AI summary
A display apparatus according to the present specification may include a substrate, a plurality of banks that partition a plurality of sub-pixels on the substrate, a light emitting element disposed on the plurality of sub-pixels, an encapsulation film disposed above the light emitting element, and a plurality of lenses disposed between the light emitting element and the encapsulation film.