Wide Angle Oval LED Package for Elevated Display Viewing
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Solution Overview
Problem
Conventional LED displays experience significant light wastage and image quality variations due to peak emission characteristics being perpendicular to the viewer's line of sight, especially when mounted elevated, leading to reduced visibility and inconsistent color representation at different viewing angles.
Innovation Solution
LED packages are designed with a horizontal emission angle greater than the vertical emission angle, featuring unique reflective cup and encapsulant geometries that enhance light distribution, providing wider horizontal far field patterns and consistent emission patterns across various vertical viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional LED packages with perpendicular peak emission are used, then the LED structure is simple and manufacturing is easy, but light wastage increases and viewing angle coverage is limited
Solution Approach 1:
The patent applies asymmetry by designing the LED package with different horizontal and vertical emission characteristics. The package structure intentionally creates asymmetric light distribution where the horizontal viewing angle (120 degrees) is wider than the vertical viewing angle, matching the typical human viewing pattern when observing displays from the front rather than from above or below. This asymmetric design reduces light wastage by directing more light toward the primary viewing direction.
Solution Approach 2:
The patent changes the emission angle parameters of the LED package by using specific optical elements (lens or reflector) with predetermined angles. The package is designed to provide a horizontal viewing angle of 120 degrees and a vertical viewing angle of 60 degrees, which are specific parameter values that optimize light distribution for elevated display mounting while reducing overall light wastage.
2Manufacturing precision
If conventional LED packages with perpendicular peak emission are used, then the LED package structure is simple, but image quality varies at different viewing angles
Solution Approach 1:
The patent precisely controls the emission angle parameters by selecting optical elements with specific geometric properties. The lens or reflector is designed with predetermined angles that transform the LED's perpendicular peak emission into a controlled horizontal 120-degree and vertical 60-degree viewing pattern. This parameter control ensures consistent image quality across the intended viewing area.
Solution Approach 2:
The patent applies local quality by creating different emission characteristics in different spatial directions. The optical element is designed to provide wider horizontal coverage (120 degrees) compared to vertical coverage (60 degrees), matching the local viewing requirements of elevated displays where horizontal viewing angle is more critical than vertical angle for maintaining image quality.
3Adaptability or versatility
If LED displays are mounted elevated above viewer eye level, then space utilization is improved, but light emission does not align with viewer line of sight
Solution Approach 1:
The patent changes the emission angle parameters to accommodate elevated mounting positions. By designing the package with a horizontal viewing angle of 120 degrees and vertical viewing angle of 60 degrees, the light distribution pattern is optimized for viewers looking up at the display from below, maintaining adequate illumination intensity across the viewing area despite the elevated position.
Solution Approach 2:
The patent addresses the mounting dimension issue by transforming the light emission pattern in the vertical dimension. Instead of perpendicular upward emission, the optical element redistributes light vertically to create a 60-degree viewing angle that reaches viewers at eye level below the display, while maintaining horizontal coverage through the 120-degree angle.
4Temperature
If conventional LED packages are used, then heat extraction through leads is attempted, but heat retention remains an issue
Solution Approach 1:
The patent extracts the heat dissipation function from the electrical leads by introducing a dedicated thermal management component - either a heat sink or thermally conductive encapsulant. This separate thermal extraction path removes heat from the LED junction more effectively, preventing heat retention that would otherwise occur through the limited thermal capacity of the electrical leads alone.
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
This design improves the viewing experience by maintaining image intensity and quality across a broader range of horizontal and vertical angles, reducing light wastage and ensuring consistent color representation, even when viewed from different positions.
Implementation Method 1
The reflective cup 13 may be filled with an encapsulant material 16 which may contain a wavelength conversion material such as a phosphor. Light emitted by the LED at a first wavelength may be absorbed by the phosphor, which may responsively emit light at a second wavelength.
Implementation Method 2
Light emitted by the LED at a first wavelength may be absorbed by the phosphor, which may responsively emit light at a second wavelength.
Implementation Method 3
In addition, heat retention may be an issue for a package such as the package 10 shown in FIG. 1, since it may be difficult to extract heat through the leads 15A, 15B.
Data Source
AI summary
The present invention is directed to LED packages and LED displays utilizing LED packages where the peak emission of the LED displays can exhibit improved emission characteristics. In some embodiments the improved characteristics include a wider horizontal emission angle for the LED packages according to the present invention, which results in improved emission characteristics for the LED display such as a wider far field pattern. This provides improved picture intensity and quality when viewing the display at different horizontal viewing angles. Different embodiments also provide for improved emission characteristics for LED packages emitting different colors of light when viewing at different vertical angles. In one embodiment the red and green LED packages can have emission patterns that are substantially the same at different vertical viewing angles within a range. This helps the colors of the display appear consistent at those angles.