Stereoscopic Display Scanning Polarization Backlight Timing
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Solution Overview
Problem
Existing stereo display technologies face challenges such as half resolution, readability issues with text, limited vertical viewing angles, and high costs due to the complexity of polarizing layers and the expense and weight of active shutter glasses.
Innovation Solution
A method and system for displaying stereoscopic content using passive glasses at full resolution by scanning and polarizing frames according to the polarization of the glasses, activating a backlight only for the entirety of the polarized frame, and repeating the process for each eye, potentially incorporating black frames to prevent ghosting and improve resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If odd and even scan lines are dedicated to separate images using a polarizing layer, then stereo viewing is achieved, but the images are provided in half the resolution of the display screen
Solution Approach 1:
The patent applies time-sequential display with periodic action by alternating between left-eye and right-eye frames at different refresh rates. The left-eye frame is displayed at a higher refresh rate while the right-eye frame is displayed at a lower refresh rate, allowing each eye to receive full-resolution images without the need to interleave scan lines spatially.
2Manufacturing precision
If active shutter glasses are used for time sequential display, then full resolution images are provided, but the glasses are expensive, require a battery, and are heavier than passive glasses
Solution Approach 1:
The patent changes the temporal parameters of frame display by assigning different refresh rates to left and right eye frames. This parameter change allows the use of simple passive polarized glasses instead of complex active shutter glasses, as the asymmetric timing creates sufficient temporal separation for passive stereoscopy while maintaining full resolution.
3Illumination intensity
If the backlight is activated continuously, then the display is always visible, but energy is wasted when frames are being scanned and not yet polarized
Solution Approach 1:
The patent applies periodic action by activating the backlight only during specific time intervals when frames are fully scanned and polarized, rather than continuously. The backlight is activated in synchronization with the frame scanning and polarization process, creating periodic illumination cycles that match the display refresh timing.
4Reliability
If the polarizing layer is precisely aligned with the pixel structure, then correct scan line polarization is achieved, but the cost increases due to the required precision
Solution Approach 1:
The patent applies preliminary action by completing the entire frame scanning and polarization process before activating the backlight for viewing. This ensures that the complete frame is properly polarized and ready for display, eliminating the need for precise continuous alignment during the scanning process and reducing manufacturing precision requirements.
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
Enables full resolution stereoscopic viewing with passive glasses, reducing costs and improving readability and viewing angles by ensuring only the intended frame is visible to each eye, thereby overcoming previous limitations.
Implementation Method 1
the scanned frame is polarized utilizing a polarizing layer of the display device, according to a polarization associated with a lens of stereoscopic glasses worn over the same one eye of the user
Implementation Method 2
a backlight is activated to illuminate the polarized frame, in response to an entirety of the polarized frame being scanned
Data Source
AI summary
The presentation of stereoscopic display content for viewing with passive glasses and full resolution is provided. In use, (a) a frame of stereoscopic display content intended for viewing by one eye of a user is scanned, using a display layer of a display device; (b) the scanned frame is polarized utilizing a polarizing layer of the display device, according to a polarization associated with a lens of stereoscopic glasses worn over the same one eye of the user; (c) a backlight is activated to illuminate the polarized frame, in response to an entirety of the polarized frame being scanned; (d) the display device is held for a predetermined period of time in response to activation of the backlight, and then the backlight is de-activated; and (a)-(d) are then repeated for the other eye of the user, with another frame of stereoscopic display content intended for viewing by the other eye.