Passive 3D LED Display Polarizer Layout to Reduce Crosstalk
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Solution Overview
Problem
Current passive 3D LED displays face challenges due to complex and expensive fabrication processes of film-type patterned retarders, limited suitability for small volume productions, and light crosstalk that restricts viewing angles, particularly in the vertical direction.
Innovation Solution
The solution involves an LED display panel with an array of light emitting devices, each equipped with a first and second circular polarizer of opposite polarizations, arranged in interlaced patterns such as checkerboard or strip-by-strip configurations, along with a layer of black and transparent resin to reduce crosstalk and enhance contrast, and a method for manufacturing these panels by cutting and attaching polarizer units to LED chips/packages on a substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If film-type patterned retarder (FPR) is applied on the display panel surface to create opposite circularly polarized images, then the 3D display effect is achieved, but the fabrication process becomes complex and expensive requiring photo-alignment steps
Solution Approach 1:
The patent divides the circular polarizer into separate components: a linear polarizer layer and a quarter-wave plate layer, which can be manufactured independently and then assembled. This segmentation eliminates the need for complex photo-alignment processes required by traditional FPR films, simplifying the fabrication process while maintaining the 3D display effect.
Solution Approach 2:
The patent combines the linear polarizer and quarter-wave plate into an integrated circular polarizer assembly that is directly mounted on the LED display panel. This merging approach replaces the complex FPR film process with a simpler assembly process, reducing fabrication complexity and cost while achieving the same optical function.
2Reliability
If FPR film is used for 3D LED display, then circularly polarized images are generated, but the film is fabricated in rolls making it unsuitable for small volume productions
Solution Approach 1:
The patent segments the circular polarizer into discrete components that can be individually manufactured and assembled, replacing the continuous roll-to-roll FPR film process. This enables flexible production volumes and allows for custom-sized displays without the constraints of roll-based fabrication.
Solution Approach 2:
The modular circular polarizer components can be independently manufactured and then assembled into the final display product, allowing for on-demand production and small batch manufacturing. This self-service approach eliminates the need for large-volume roll-to-roll fabrication and enables adaptable production scales.
3Reliability
If traditional 3D LED display structure is used, then light crosstalk occurs, but this restricts the viewing angle especially in the vertical direction
Solution Approach 1:
The patent extracts and removes the harmful light crosstalk by implementing a light shield structure between adjacent LED elements. This extraction of the harmful element (crosstalk) allows the display to maintain high light output while eliminating the viewing angle restrictions caused by vertical crosstalk.
Solution Approach 2:
The patent introduces a light shield as an intermediary element between the LED light source and the viewer's eyes. This mediator blocks the harmful crosstalk light paths while allowing the intended light to pass through, thereby expanding the viewing angle without compromising light output.
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 approach reduces production costs, enhances flexibility in applications, and minimizes optical crosstalk, thereby improving the viewing angle and contrast ratio of 3D LED displays.
Implementation Method 1
A circular polarizer includes a linear polarizer (e.g., a film or a plate) and a quarter-wave plate (QWP) adhered together. The incident, unpolarized light passes the linear polarizer and becomes linearly polarized light, which passes through QWP and becomes either right-circularly or left-circularly polarized light.
Implementation Method 2
a layer of black resin is disposed in and fills the gap between adjacent light emitting devices
Data Source
AI summary
A 3D LED display panel that includes a substrate and an array light emitting devices mounted on the substrate. The array of light emitting devices includes a plurality of first light emitting devices and a plurality of second light emitting devices. Each first light emitting device has an LED chip/package electrically connected to the substrate and a piece of first circular polarizer attached to the LED chip/package. Likewise, each second light emitting device includes an LED chip/package electrically connected to the substrate and a piece of second circular polarizer attached to the LED chip/package. The first circular polarizer the second circular polarizer have opposite circular polarizations.