Micro-LED Optical Layer Structure for Light Leakage Control
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Solution Overview
Problem
Liquid crystal display devices suffer from limitations in design and luminance deterioration over time, while organic light emitting display devices are vulnerable to moisture, affecting reliability and lifespan, and existing light emitting diode displays need improvements in light efficiency.
Innovation Solution
A display device design featuring a substrate with sub-pixels, light emitting diodes, a planarization layer with openings, and optical layers that cover the diodes to enhance light efficiency by scattering and converting light, including quantum dots for wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystal display device uses backlight unit, then image can be displayed, but design is limited and luminance deteriorates over time
Solution Approach 1:
The patent removes the backlight unit from the display structure and replaces it with self-emissive micro-LEDs. This extraction of the problematic backlight component eliminates the source of luminance deterioration while maintaining the display function through direct light emission from the LED pixels.
2Reliability
If organic light emitting display device is used, then self-emission is achieved, but vulnerability to moisture reduces reliability and lifespan
Solution Approach 1:
The patent replaces the moisture-sensitive organic materials with inorganic micro-LED structures that are inherently more resistant to environmental degradation. The micro-LEDs use robust inorganic semiconductor materials that do not suffer from the same moisture-induced degradation as organic compounds, thereby extending operational lifespan and improving reliability.
3Use of energy by moving object
If conventional light emitting diode structure is used, then light emission is achieved, but light efficiency can be improved
Solution Approach 1:
The patent implements a planarization layer with spatially varying properties: a first region directly over the micro-LED with different characteristics than a second region surrounding it. This local differentiation allows optimized light extraction and management in different zones, improving overall light efficiency by addressing specific optical challenges at different locations within the pixel structure.
Solution Approach 2:
The patent introduces a vertical dimension to light management through the planarization layer structure and optical layers positioned above the micro-LED. By utilizing the z-dimension (vertical space) rather than only lateral light control, the design enhances light extraction efficiency and redirects light that would otherwise be lost, thereby improving overall luminous efficiency.
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
Improves light efficiency and prevents light leakage, enhancing the performance of light emitting diode displays by effectively scattering and converting light, thereby improving overall display quality.
Implementation Method 1
enhance light efficiency by scattering and converting light
Implementation Method 2
including quantum dots for wavelength conversion
Data Source
AI summary
A display device in one example includes a substrate on which a plurality of sub-pixels are disposed, where each of the plurality of sub-pixels includes an emitting area and a non-emitting area adjacent to the emitting area. The display device further includes a plurality of light emitting diodes in the emitting area on the substrate, a planarization layer disposed on the light emitting diode and having an opening, and a plurality of optical layers disposed on the planarization layer. The planarization layer includes a central portion covering each of the plurality of light emitting diodes and an outer portion surrounding the central portion. Further, the central portion and the outer portion are spaced apart by the opening, and each of the plurality of optical layers covers the central portion of the planarization layer and fills an inside of the opening.