Reflective Viewing Window Module for Hologram Displays
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Solution Overview
Problem
Conventional holographic display technologies face limitations in improving viewing conditions due to restrictions on spatial light modulator (SLM) pixel size, leading to small viewing windows and increased data traffic, as well as wavelength dependency issues with asymmetric scatter plates.
Innovation Solution
A viewing window control module incorporating a first reflective optical system for forming a viewing window and a second reflective optical system for expanding the viewing angle, configured as a concave or micro-concave mirror, integrated directly onto the viewing window forming unit, addresses location accuracy and wavelength independence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the pixel size of spatial light modulator is reduced to improve diffraction power and viewing window size, then the viewing window becomes larger, but the resolution is compromised and data traffic increases
Solution Approach 1:
The patent divides the optical system into multiple functional components: a viewing window forming unit with a first reflective optical system to create the viewing window, and a viewing angle expanding unit with a second reflective optical system to expand the viewing angle. This segmentation allows each component to be optimized independently for its specific function, resolving the contradiction between viewing window size and resolution.
Solution Approach 2:
The patent introduces a new optical dimension by using reflective optical systems instead of relying solely on the spatial light modulator's pixel dimensions. The first reflective optical system forms the viewing window in one dimension, while the second reflective optical system expands the viewing angle in another dimension, allowing both viewing window size and resolution to be improved simultaneously.
2Adaptability or versatility
If conventional asymmetric scatter plates are used to control viewing angle, then viewing conditions are improved, but wavelength dependency issues arise
Solution Approach 1:
The patent replaces the conventional asymmetric scatter plate (a diffractive/optical element) with a reflective optical system consisting of a first reflective optical system to form the viewing window and a second reflective optical system to expand the viewing angle. This substitution eliminates wavelength dependency because reflective surfaces operate on the law of reflection, which is wavelength-independent, while maintaining effective viewing angle control.
Solution Approach 2:
The patent changes the optical parameter from diffractive (asymmetric scatter plate) to reflective (concave mirror systems). By using reflective optical systems with specific curvature radii and positions, the system achieves wavelength-independent viewing angle control while maintaining the desired viewing conditions.
3Adaptability or versatility
If additional optical systems are added to expand viewing angle, then viewing conditions are improved, but device complexity increases
Solution Approach 1:
The patent merges the viewing window forming function and viewing angle expanding function into a single integrated unit. The viewing window control module combines the first reflective optical system (for forming the viewing window) and the second reflective optical system (for expanding the viewing angle) in one location, eliminating the need for separate optical systems and reducing overall device complexity.
Solution Approach 2:
The viewing window control module is designed as a multi-functional unit that simultaneously performs viewing window formation and viewing angle expansion. This universal design allows a single component to address multiple requirements, reducing the total number of optical elements needed in the system.
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 enhances viewing angle and window size without additional optical systems, reducing complexity and wavelength dependency, thereby improving hologram display quality and simplifying device configuration.
Implementation Method 1
a viewing window forming unit having a first reflective optical system that receives an incident light and forms a viewing window in a user's viewing region
Implementation Method 2
a viewing angle expanding unit having a second reflective optical system that is arranged in one direction on the viewing window forming unit and expands a viewing angle of the viewing window
Implementation Method 3
a spatial light modulator configured to include a plurality of pixels and to modulate an input light to a diffracted light
Data Source
AI summary
Disclosed herein a module controlling viewing window, a device for hologram display and a method for displaying hologram. The module controlling viewing window includes: a viewing window forming unit having a first reflective optical system that receives an incident light and forms a viewing window in a user's viewing region; and a viewing angle expanding unit having a second reflective optical system that is arranged in one direction on the viewing window forming unit and expands a viewing angle of the viewing window.