Stereo Image Generation Using Oscillating Polarized LCD Displays
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Solution Overview
Problem
Single Liquid Crystal Display (LCD) screens are limited in their ability to present three-dimensional images, relying on illusions or multiple screens stacked at different distances to create depth, which is not optimal for immersive stereo image generation.
Innovation Solution
A system comprising two stacked LCD screens with differing polarization states, where a controller oscillates the power supply to one screen between 'on' and 'off' positions, allowing alternating images with different polarities to be projected, and a lens assembly with polarized portions to direct these images to the viewer's eyes, creating a stereo image effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple LCD screens are stacked at different distances to create three-dimensional images, then the three-dimensional effect is improved, but the device complexity increases
Solution Approach 1:
The patent applies periodic action by rapidly alternating the display content between two LCD screens at different brightness states (on/off cycles). The first screen displays a image while the second displays a different image, then they switch in the next cycle. This temporal periodic modulation creates the perception of three-dimensional depth through binocular disparity, achieving the 3D effect without permanently stacking multiple active displays, thus reducing device complexity while maintaining the three-dimensional image quality.
2Stability of the object's composition
If shaded surface and hidden line rendering methods are used on a single screen, then the illusion of three-dimensions is improved, but the visual realism deteriorates
Solution Approach 1:
The patent introduces polarized light as an intermediary mechanism between the display screens and the viewer's eyes. By using polarized LCD screens with orthogonal polarization states and corresponding polarized lenses or filters, the system delivers different images to each eye (binocular disparity). This intermediary optical approach creates genuine three-dimensional perception through natural human depth perception mechanisms, significantly improving visual realism compared to artificial shading methods on a single screen.
3Stability of the object's composition
If a controller oscillates power supply to alternate image projection between displays, then the stereo image quality is improved, but the energy consumption increases
Solution Approach 1:
The controller implements periodic action by oscillating the power supply to alternate which display is active (on) and which is inactive (off). During each cycle, only one display consumes significant power while the other is in a low-power state. This temporal separation of active display states reduces overall energy consumption compared to having both displays continuously active, while still maintaining stereo image quality through the alternating presentation of left and right eye images that the human visual system integrates.
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 method enhances the perception of three-dimensional images by alternating polarized images between the viewer's eyes, providing a more immersive and effective stereo image generation compared to traditional methods.
Implementation Method 1
The first polarizing filter polarizes light originating from an unpolarized light source. The second polarizing filter is set to the same polarizational state as the first polarizing filter. Thus, light polarized from the first filter is passed through the second filter without attenuation. However, when an electrical field is applied locally to the liquid crystal layer, the crystals modify the polarization state of the light incoming from the first polarization filter.
Implementation Method 2
In one embodiment, a system for generating stereo images includes a first display adapted to project a polarized first image along a viewing axis, a second display operatively positioned relative to the first display and adapted to project a polarized second image along the viewing axis
Data Source
AI summary
In one embodiment, a system for generating stereo images includes a front display adapted to project a polarized first image along a viewing axis, a back display adapted to project a polarized second image along the viewing axis and through the front display, and a controller coupled to at least the front display and adapted to oscillate image projection between the front display and back display. The system in this embodiment further includes a first lens portion and a second lens portion, the first lens portion being polarized to the same state as the front display and the second lens portion being polarized to the same state as the back display.