Stereoscopic flat panel display with updated blanking intervals
View Patent ↗This disclosure describes stereoscopic flat panel display systems based on the polarization encoding of sequentially displayed left and right eye images. The systems comprise line-by-line addressed liquid crystal display (LCD) panels, illuminating back light units and polarization control panels (PCPs). Right and left eye images are written sequentially onto the LCD whose polarization is controlled by a substantially synchronously driven PCP. The backlight may be continuously illuminated, or modulated temporally, spatially or both, as can the PCP.
1. A flat panel display operable to display stereoscopic imagery, comprising:
a backlight operable to selectively provide light;
a liquid crystal (LC) modulation panel positioned to receive the light incident from the backlight and operable to modulate the light incident from the backlight; and
a polarization control panel (PCP) positioned to receive the modulated light incident from the LC modulation panel and operable to selectively transform the state of polarization (SOP) of the modulated light incident from the LC modulation panel in synchronization with the backlight and LC modulation panel;
wherein the flat panel display has at least two operating states, comprising:
a presentation state in which the backlight provides light to the LC modulation panel, in which the PCP operates in one of a right-eye polarization mode and a left-eye polarization mode, wherein when the PCP operates in the left-eye polarization mode the LC modulation panel operates in a left-eye image mode, and wherein when the PCP operates in the right-eye polarization mode the LC modulation panel operates in a right-eye image mode; and
a transition state in which the backlight does not provide light to substantially any portion of the LC modulation panel when the LC modulation panel changes between the left-eye and right-eye image modes, and when the PCP transitions between the left-eye and the right-eye polarization modes;
wherein the right-eye polarization mode comprises altering the light to circularly polarized light capable of being analyzed by a right-eye analyzer.
2. The flat panel display of claim 1 , wherein in the presentation state, the PCP is operating in the right-eye polarization mode, and the LC modulation panel operates in the right-eye image mode;
and wherein in the transition state, the PCP is transitioning from the right-eye to the left-eye polarization mode, and the LC modulation panel is changing from the right-eye to the left-eye image mode.
3. The flat panel display of claim 1 , wherein in the presentation state, the PCP is operating in the left-eye polarization mode, and the LC modulation panel operates in the left-eye image mode;
and wherein in the transition state, the PCP is transitioning from the left-eye to the right-eye polarization mode, and the LC modulation panel is changing from left-eye to right-eye image mode.
4. The flat panel display of claim 1 , wherein the right-eye polarization mode comprises altering the light to linearly polarized light capable of being analyzed by a right-eye analyzer.
5. The flat panel display of claim 1 , wherein the backlight is a globally modulated backlight unit.
6. The flat panel display of claim 1 , wherein the PCP is a globally addressed PCP.
7. The flat panel display of claim 1 , wherein the transition state comprises a time period equal to or greater than a settling time period associated with at least one of an LC modulation panel addressing time period and a PCP settling period.
8. The flat panel display of claim 1 , wherein the presentation state comprises a 25% duty cycle.
9. The flat panel display of claim 1 , wherein the transition state comprises a 75% duty cycle.
10. The flat panel display of claim 1 , wherein when the PCP operates in the right-eye polarization mode, the SOP of the modulated light incident from the LC modulation panel is transformed such that a left-eye analyzer would block the transformed, modulated light output by the PCP.
11. The flat panel display of claim 1 , wherein the right-eye image mode comprises a mode in which the LC modulation panel has a majority of settled data lines displaying right-eye image content.
12. A flat panel display operable to display stereoscopic imagery, comprising:
a backlight operable to selectively provide light;
a liquid crystal (LC) modulation panel positioned to receive the light incident from the backlight and operable to modulate the light incident from the backlight; and
a polarization control panel (PCP) positioned to receive the modulated light incident from the LC modulation panel and operable to selectively transform the state of polarization (SOP) of the modulated light incident from the LC modulation panel in synchronization with the backlight and LC modulation panel;
wherein the flat panel display has at least two operating states, comprising:
a presentation state in which the backlight provides light to the LC modulation panel, in which the PCP operates in one of a right-eye polarization mode and a left-eye polarization mode, wherein when the PCP operates in the left-eye polarization mode the LC modulation panel operates in a left-eye image mode, and wherein when the PCP operates in the right-eye polarization mode the LC modulation panel operates in a right-eye image mode; and
a transition state in which the backlight does not provide light to substantially any portion of the LC modulation panel when the LC modulation panel changes between the left-eye and right-eye image modes, and when the PCP transitions between the left-eye and the right-eye polarization modes; and
wherein the right-eye polarization mode comprises a mode in which the PCP transforms the SOP of the modulated light into opposite handed circular polarized light for a certain design wavelength, and wherein the left-eye polarization mode comprises a mode in which the PCP transforms the SOP of the modulated light into opposite handed circular polarized light for the certain design wavelength.
13. A method for displaying stereoscopic imagery on a flat panel display having a backlight, a liquid crystal (LC) modulation panel and a polarization control panel (PCP), the method comprising:
presenting stereoscopic imagery in a presentation state comprising:
providing light from the backlight to the LC modulation panel;
providing modulated light from the LC modulation panel to the PCP;
operating the PCP in one of a right-eye polarization mode and a left-eye polarization mode, wherein when the PCP operates in the left-eye polarization mode the LC modulation panel operates in a left-eye image mode, and wherein when the PCP operates in the right-eye polarization mode the LC modulation panel operates in a right-eye image mode; and
transitioning between left-eye and right-eye views in a transition state comprising:
not providing light from the backlight to substantially any portion of the LC modulation panel when the LC modulation panel changes between the left-eye and right-eye image modes, and when the PCP transitions between the left-eye and the right-eye polarization modes;
wherein operating the PCP in the right-eye polarization mode comprises altering the light to linearly polarized light capable of being analyzed by a right-eye analyzer.
14. The method of claim 13 , wherein in the presentation state, the PCP is operating in the right-eye polarization mode, and the LC modulation is operating in the right-eye image mode;
and wherein in the transition state, the PCP is transitioning from the right-eye to the left-eye polarization mode, and the LC modulation panel is changing from the right-eye to the left-eye image mode.
15. The method of claim 13 , wherein in the presentation state, the PCP is operating in the left-eye polarization mode, and the LC modulation panel is operating in the left-eye image mode;
and wherein in the transition state, the PCP is transitioning from the left-eye to the right-eye polarization mode, and the LC modulation panel is changing from the left-eye to the right eye image mode.
16. The method of claim 13 , wherein operating the PCP in the right-eye polarization mode comprises altering the light to linearly polarized light capable of being analyzed by a right-eye analyzer.
17. The method of claim 13 , wherein transitioning between left-eye and right-eye views in the transition state further comprises transitioning over a time period equal to or greater than a settling time period associated with at least one of a LC modulation panel addressing time period and a PCP settling time period.
18. The method of claim 13 , presenting stereoscopic imagery in the presentation state further comprises a 25% duty cycle.
19. The method of claim 13 , wherein transitioning between left-eye and right-eye views in the transition state comprises a 75% duty cycle.
20. The method of claim 13 , wherein operating the PCP in the right-eye polarization mode comprises transforming the SOP of the modulated light incident from the LC modulation panel such that a left-eye analyzer would block the transformed, modulated light output by the PCP.