Holographic Pixel Overlap in Projectors for Brighter Micro LED Displays
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Solution Overview
Problem
Micro LED display panels in ultra-small projectors and head-mounted displays face challenges with insufficient brightness and decreased resolution due to limited emission area, leading to reduced pixels per inch (PPI).
Innovation Solution
An optical system utilizing a combination of transmissive and reflective holographic optical elements (HOEs) to shift and overlap pixel beams, increasing brightness and resolution by partially overlapping pixel images, with each element diffracting and transmitting beams to enhance pixel density and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If micro LED display panels are used in ultra-small projectors, then the device size is reduced, but brightness and resolution decrease due to limited emission area
Solution Approach 1:
The patent applies dimensional transformation by using holographic optical elements to shift pixel images from a two-dimensional plane to a three-dimensional overlapping configuration. Multiple pixel images are shifted along the optical path and overlapped in space, effectively utilizing the third dimension (depth) to increase brightness without increasing the emission area of the display panel.
Solution Approach 2:
The patent merges multiple pixel images by overlapping them in the optical path. The holographic optical elements shift and combine several pixel images from different display panels, causing them to overlap and accumulate light intensity at the same spatial location, thereby increasing overall brightness while maintaining a compact device structure.
2Volume of moving object
If micro LED display panels are used in ultra-small projectors, then the device size is reduced, but resolution decreases due to limited pixels per inch
Solution Approach 1:
The patent uses dimensional transformation to increase resolution by overlapping pixel images along the optical path. Instead of increasing pixel density on a two-dimensional panel, the system shifts and overlaps pixel images in three-dimensional space, effectively multiplying the perceived resolution without increasing the physical pixel count on the display panel.
Solution Approach 2:
The patent creates multiple copies of pixel images from different display panels and overlaps them in the optical path. The holographic optical elements generate shifted copies of the pixel images, which are then combined to produce a higher resolution output than any single display panel could achieve alone.
3Illumination intensity
If multiple display panels are used to increase brightness, then the number of pixels per inch decreases and resolution is lost
Solution Approach 1:
The patent resolves this contradiction by utilizing the third dimension (optical path length) to separate the functions of multiple display panels. Instead of arranging panels side-by-side in two dimensions (which would reduce PPI), the system overlaps their images along the optical path in three dimensions, allowing multiple panels to contribute to brightness without compromising resolution.
Solution Approach 2:
The holographic optical elements serve as intermediaries that shift and overlap the pixel images from multiple display panels. These intermediary optical components enable the combination of multiple light sources while maintaining precise spatial alignment, thereby preserving resolution while achieving increased brightness through the叠加 effect.
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 system achieves a quadrupled pixel density and increased brightness by partially overlapping pixel images, resulting in clearer and more detailed displays.
Implementation Method 1
a first transmissive holographic optical element configured to separate the first beam into a first diffracted beam and a second diffracted beam and transmit the first diffracted beam and the second diffracted beam
Implementation Method 2
a reflective holographic optical element configured to transmit the first diffracted beam and the second diffracted beam, and diffract and reflect the third diffracted beam and the fourth diffracted beam in a same direction as the first diffracted beam and the second diffracted beam
Implementation Method 3
a reflective holographic optical element configured to transmit the first diffracted beam and the second diffracted beam, and diffract and reflect the third diffracted beam and the fourth diffracted beam
Data Source
AI summary
A projector and display apparatus using a holographic optical element are provided. The projector includes a first display panel configured to emit a first beam of a first image, a second display panel configured to emit a second beam of a second image, a first transmissive holographic optical element configured to separate the first beam into a first diffracted beam and a second diffracted beam such that pixels of the first image overlap each other, a second transmissive holographic optical element configured to separate the second beam into a third diffracted beam and a fourth diffracted beam such that pixels of the second image overlap each other, a reflective holographic optical element configured to diffract and reflect the third and fourth diffracted beams in the same direction as the first and second diffracted beams such that the first image and the second image at least partially overlap each other, and a projection lens.