LED Package Wells for Directional Backlight Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Spatially multiplexed autostereoscopic displays face issues with reduced spatial resolution, image flicker, and non-uniform viewing windows due to pixel gaps and electrode structures, which limit viewing freedom and increase visual strain.
Innovation Solution
A light emitting diode package design with a protection diode separated from the light generation elements and arranged in a specific well configuration, along with wavelength conversion materials, enhances luminous flux and luminance, and includes a directional backlight with a waveguide system for controlled light distribution and high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the protection diode is integrated in the same well as the light generation element, then the package structure is simplified, but the luminous flux and luminance are reduced due to space occupation
Solution Approach 1:
The patent divides the package into multiple wells: a first well for the light generation element and a second well for the protection diode. This segmentation allows both components to coexist without spatial interference, maximizing the light generation element's luminous flux while providing dedicated space for the protection diode's electrical protection function.
Solution Approach 2:
The patent transitions from a two-dimensional planar layout to a three-dimensional vertical structure with multiple wells at different heights. The first well extends to a first height and the second well extends to a second height, allowing components to be stacked vertically rather than competing for horizontal space, thereby increasing luminous flux without adding package footprint.
2Reliability
If the first well has larger lateral extents to accommodate both elements, then both elements can be housed, but the light extraction efficiency is reduced
Solution Approach 1:
The patent segments the packaging space into distinct first and second wells with different lateral extents. The first well has lateral extents optimized for light extraction from the light generation element, while the second well has lateral extents optimized for accommodating the protection diode, allowing each component to operate at peak efficiency without compromising the other.
3Illumination intensity
If wavelength conversion material is added to convert blue light to yellow light, then white light output is improved, but the package complexity and material requirements increase
Solution Approach 1:
The patent merges the wavelength conversion function directly into the first well by placing wavelength conversion material in contact with the light generation element. This integration eliminates the need for separate conversion components and allows the conversion process to occur immediately at the light source, improving white light output while minimizing additional package 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
The solution increases luminance and efficiency, reduces flicker, and provides high contrast ratios, enabling effective outdoor use with reduced cost and complexity, while maintaining thermal management and protection from electrostatic discharge.
Implementation Method 1
at least one light generation element arranged to generate light in an emission band
Implementation Method 2
a wavelength conversion material arranged to convert at least some of the light in the emission band generated by the light generation element into light in a conversion band
Implementation Method 3
a waveguide comprising an input end arranged to receive input light from the light emitting diode array
Data Source
AI summary
A light emitting diode package for a directional display may comprise light emitting diodes and a protection diode. The protection diode may be arranged in a well that is at a different location to the well that the light emitting diodes are arranged. The directional display may include a waveguide. The waveguide may include light extraction features arranged to direct light from an array of light sources by total internal reflection to an array of viewing windows and a reflector arranged to direct light from the waveguide by transmission through extraction features of the waveguide to the same array of viewing windows. The brightness of the directional display can be increased. An efficient and bright directional display system can be achieved. Efficient light baffling for light escaping from the edge of the waveguide is achieved through light deflecting extraction films.