Light Field Display Picture Elements Monolithic Integration
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Solution Overview
Problem
Existing display technologies face challenges in providing ultra-high-density light emitting elements for light field displays, which require multiple views at different locations to create a 3D experience, due to limitations in the number and organization of light emitting elements, as well as complexity and cost.
Innovation Solution
A display system with a plurality of picture elements supported on a single semiconductor substrate, featuring a backplane with electronic circuitry connected to an array of light emitting elements, including sets of inorganic LEDs emitting light at different wavelengths, and a light steering optical element to direct light in predetermined directions, allowing for individual control of each light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of light emitting elements are used to achieve ultra-high-density light field display, then the quality of 3D experience and multiple views is improved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The display system is divided into multiple picture elements, each containing a compact array of light emitting elements (such as micro-LEDs or quantum dots) organized in a grid pattern. Each picture element functions as an independent unit with its own light steering optical element, allowing the large number of light emitting elements to be managed through modular segmentation rather than as a monolithic complex system
Solution Approach 2:
The patent transitions from traditional two-dimensional display architecture to a three-dimensional light field architecture by stacking multiple layers of light emitting elements and light steering optical elements. This vertical stacking in the third dimension allows ultra-high-density packing of light emitting elements while maintaining manageable complexity through layered modular design
2Ease of manufacture
If traditional display technologies are used, then the manufacturing process is simpler and cost is lower, but the ability to provide multiple views and 3D experience is limited
Solution Approach 1:
Each picture element is designed as a multi-functional unit that simultaneously performs light emission, light steering, and view-specific image rendering. The light steering optical elements (such as microlens arrays or grating structures) are integrated directly with the light emitting element arrays, allowing a single modular component to handle multiple functions that would otherwise require separate systems
Solution Approach 2:
The patent utilizes quantum dots with precisely controlled size parameters to achieve different emission wavelengths and colors. By changing the size parameter of quantum dots during manufacturing, multiple color channels can be produced using the same base material system, simplifying the manufacturing process compared to requiring multiple different phosphor materials or LED types
3Illumination intensity
If inorganic LEDs with different wavelengths are used in each picture element, then color accuracy and brightness are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent employs quantum dots where the emission wavelength is determined by the dot size parameter rather than requiring different chemical compositions or materials. This allows a single quantum dot layer to be manufactured with a size distribution that produces the desired spectrum, or separate quantum dot layers with different average sizes to produce different colors, all using the same quantum confinement mechanism and simplified manufacturing process
Solution Approach 2:
The light emitting structure combines inorganic LEDs (such as GaN-based blue LEDs) with quantum dot phosphor materials to create hybrid light emitting units. The LED provides the pump excitation and the quantum dots convert this to specific wavelengths with narrow emission bands, achieving high color accuracy and brightness while utilizing the mature manufacturing processes for both LED and quantum dot materials
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 configuration enables the creation of high-density light emitting arrays that provide a rich 3D experience with improved brightness and energy efficiency, addressing the limitations of traditional displays by enabling multiple views at different locations with reduced complexity and cost.
Implementation Method 1
Each inorganic LED in the first set, second set, and third set of inorganic LEDs is configured for emitting light at a first wavelength, a second wavelength, and a third wavelength, respectively
Implementation Method 2
The light steering optical element is configured for steering the light from the first, second, and third inorganic LEDs in a predetermined direction
Data Source
AI summary
A display system includes (i) a plurality of picture elements supported on a single semiconductor substrate and (ii) a backplane including electronic circuitry supported thereon and electronically connected with the picture elements. Each picture element includes a light steering optical element and an array of light emitting elements. The array of light emitting elements includes a first set, a second set, and a third set of inorganic LEDs that (i) are monolithically integrated on the single semiconductor substrate and (ii) emit, respectively, light at a first, a second, and a third wavelength, which are mutually distinct. The light steering optical element is configured for steering the light from the first set, second set, and third set of LEDs in a predetermined direction. The electronic circuitry is configured for individually driving each light emitting element of the array of light emitting elements.