LED Pixel Bank Structure for Viewing-Angle Luminance Uniformity
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Solution Overview
Problem
Light-emitting diode (LED) display devices face issues with luminance non-uniformity due to differences in luminance levels between front and side surfaces, asymmetry caused by P/N electrode structures, and manufacturing process tolerances leading to varying viewing angles.
Innovation Solution
A display apparatus is designed with a substrate, a light-emitting diode in each pixel, a first insulating layer around the LED, a second insulating layer on top, and a first bank around the second insulating layer to absorb light beams with small emission direction angles, reducing visibility differences and luminance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-emitting diode display device is used to achieve high image quality and high reliability, then the display performance is improved, but luminance non-uniformity occurs due to differences between front and side surfaces
Solution Approach 1:
The patent applies asymmetry by configuring the bank structure with different shapes or sizes on different sides of the light-emitting diode. Specifically, the bank may have a first shape on a first side and a second shape on a second side, allowing asymmetric compensation for luminance deviations that occur in different viewing directions. This asymmetric design enables targeted correction of luminance non-uniformity without compromising the overall display performance.
2Adaptability or versatility
If a P/N electrode structure is used in the light-emitting diode, then the device functionality is achieved, but asymmetry in luminance level occurs in left and right beam angles
Solution Approach 1:
The patent applies local quality by making different portions of the bank have different properties. The bank is configured to have different shapes or sizes on different sides, allowing each local region to compensate for luminance deviations specific to that viewing direction. This localized adjustment addresses the asymmetric luminance issue caused by the P/N electrode structure while maintaining the overall device functionality.
3Ease of manufacture
If manufacturing process tolerances are present in the light-emitting diode, then production feasibility is maintained, but non-uniformity of viewing angle increases depending on position
Solution Approach 1:
The patent applies parameter changes by adjusting the geometric parameters of the bank structure. The bank may have varying widths, lengths, or shapes on different sides to compensate for viewing angle non-uniformity. By changing these structural parameters, the patent achieves compensation for position-dependent viewing angle variations while maintaining production feasibility through a relatively simple structural modification.
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 proposed solution effectively reduces luminance deviations based on viewing angles, enhancing the uniformity of light emission and improving the display's overall brightness and image quality.
Implementation Method 1
the bank may be disposed around the light-emitting diode to absorb a light beam among light beams emitted from the light-emitting diode that has a small emission direction angle relative to an upper surface of a substrate
Data Source
AI summary
A display apparatus presented herein includes a substrate having a pixel, a light-emitting diode in the pixel, a first insulating layer around the light-emitting diode, a second insulating layer on the first insulating layer, and a first bank around the second insulating layer.