Micro LED Bank Optics for Zero-Bezel Color Isolation
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Solution Overview
Problem
Display devices using liquid-crystal or organic light-emitting diodes face limitations in reducing bezel size due to the need for sealants and encapsulation layers, which affect luminous efficiency and visibility, especially in large screens.
Innovation Solution
A display device utilizing small inorganic LEDs with an optical structure on the bank to reflect light emitted from the LEDs, improving luminous efficiency and preventing color mixing between pixels, featuring a bank with a black material to absorb light and an inclined side surface, along with a protective layer to adjust the angle of the bank and a planarization layer for stable LED placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If liquid-crystal display devices or organic light-emitting display devices are used, then the display can be implemented with existing technology, but the bezel size cannot be reduced due to the need for sealants and encapsulation layers
Solution Approach 1:
The patent extracts and eliminates the need for sealants and encapsulation layers by transitioning from liquid-crystal and organic LED technologies to inorganic micro LED technology. This removal of unnecessary components directly reduces the bezel size while maintaining display functionality, as inorganic LEDs do not require the protective encapsulation that organic materials demand.
Solution Approach 2:
The patent changes the material parameter of the light-emitting element from organic to inorganic. This material parameter change fundamentally alters the requirements for encapsulation and sealing, enabling a reduction in bezel size since inorganic LEDs are inherently more stable and do not require the same level of protective encapsulation as organic materials.
2Reliability
If organic light-emitting diodes are used, then the display can be implemented with flexible materials, but the reliability is reduced due to vulnerability to moisture and oxygen
Solution Approach 1:
The patent changes the material composition parameter from organic to inorganic, which fundamentally improves reliability. Inorganic materials are inherently resistant to moisture and oxygen degradation, eliminating the need for complex encapsulation structures and directly enhancing the display's reliability in various environmental conditions.
3Manufacturing precision
If the bank side surface is made vertical to prevent color mixing, then color isolation between pixels is improved, but luminous efficiency is reduced due to light loss
Solution Approach 1:
The patent applies local quality by creating an inclined side surface on the bank structure rather than a uniform vertical surface. This localized geometric modification allows light to be reflected at specific angles away from adjacent pixels, achieving effective color isolation while simultaneously directing more light toward the viewing direction, thus maintaining luminous efficiency.
4Illumination intensity
If a reflective optical structure is added to improve luminous efficiency, then the amount of light emitted is increased, but the device complexity increases
Solution Approach 1:
The patent merges the optical structure directly with the bank that already exists in the display structure. By integrating the reflective function into the existing bank component rather than adding a separate independent optical element, the patent achieves enhanced luminance while minimizing the increase in overall 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
Enhances the luminance and visibility of the display device, elongates its lifetime, and suppresses color mixing between pixels, allowing for a zero-bezel design suitable for large screens.
Implementation Method 1
an optical structure disposed on a side surface of the bank to improve luminous efficiency. The optical structure may cover the side surface of the bank to reflect light emitted from the light-emitting diode toward an image display side.
Implementation Method 2
The bank may include a black material absorb light and the side surface of the bank may be inclined with respect to a horizontal plane by an angle of 80 to 90 degrees.
Data Source
AI summary
There is provided a display device. The display device includes an optical structure disposed to increase the amount of light emitted from a light-emitting diode; and a bank coupled with the optical structure.