Digital Hologram Display Device Using Single Spatial Light Modulator
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Solution Overview
Problem
Existing digital hologram display devices using multiple spatial light modulators (SLMs) face challenges such as alignment difficulties, increased cost, thickness, and complex driving mechanisms, which hinder efficient 3D image reproduction.
Innovation Solution
A digital hologram display device employing a single spatial light modulator with adjacent pixels that modulate both phase and amplitude of light, utilizing a light combiner to align and combine the modulation light paths, thereby maximizing interference and simplifying the display process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SLMs are used to modulate phase and amplitude of light, then the interference of light is maximized and 3D image quality is improved, but the device complexity, alignment difficulty, cost, and thickness increase
Solution Approach 1:
The patent combines the functions of multiple SLMs into a single SLM by using adjacent pixels to modulate both phase and amplitude of light simultaneously. This merging approach eliminates the need for multiple separate SLM components while maintaining the light interference capability necessary for high-quality 3D image display, thereby reducing device complexity and alignment requirements
Solution Approach 2:
The single SLM is designed to perform multiple functions: it modulates both phase and amplitude of light using different pixel groups, replacing what previously required separate dedicated SLMs for each function. This multi-functional design reduces the overall number of components and simplifies the system architecture
2Reliability
If multiple SLMs are used to modulate phase and amplitude of light, then the interference of light is maximized and 3D image quality is improved, but the fabrication cost increases
Solution Approach 1:
By merging the functions of multiple SLMs into a single multi-functional SLM, the patent reduces the total number of expensive optical components that need to be fabricated and assembled. This consolidation directly lowers fabrication costs while maintaining the capability to produce high-quality 3D images through light interference
3Reliability
If multiple SLMs are used to modulate phase and amplitude of light, then the interference of light is maximized and 3D image quality is improved, but the device thickness increases
Solution Approach 1:
The patent merges multiple thick SLM components into a single SLM layer, significantly reducing the cumulative thickness of the device. The single SLM performs all necessary phase and amplitude modulation functions in one layer rather than requiring stacked multiple SLMs, thereby reducing overall device thickness
4Reliability
If multiple SLMs are used to modulate phase and amplitude of light, then the interference of light is maximized and 3D image quality is improved, but the driving mechanism becomes complex
Solution Approach 1:
The patent combines the control of multiple SLMs into a single unified control system for one SLM. The controller manages adjacent pixels to perform both phase and amplitude modulation through coordinated activation, eliminating the complex multi-device coordination required previously and simplifying the driving mechanism
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 solution reduces the need for multiple SLMs, decreases fabrication costs, minimizes device thickness, and simplifies the driving mechanism, while enhancing the visual stereoscopic properties of the 3D image display.
Implementation Method 1
a first pixel outputting a first modulation light by modulating a phase of a first plane-polarized light and a second pixel outputting a second modulation light by modulating the phase of the first plane-polarized light
Implementation Method 2
for combining the first modulation light with the second modulation light, wherein a phase of the first modulation light is different from a phase of the second modulation light
Data Source
AI summary
The present disclosure relates to a digital hologram display device displaying 3D image as a hologram by using a complex modulation. The digital hologram display device comprising a spatial light modulator including a first pixel outputting a first modulation light by modulating a phase of a first plane-polarized light and a second pixel outputting a second modulation light by modulating the phase of the first plane-polarized light, wherein the second pixel is adjacent to the first pixel; and a light combiner changing a path of the first modulation light outputted from the first pixel so that the path of the first modulation light corresponds to a path of the second modulation light outputted from the second pixel for combining the first modulation light with the second modulation light, wherein a phase of the first modulation light is different from a phase of the second modulation light.