Boundary artifact suppression in segmented liquid crystal modulators
Disclosed herein are apparatuses and related methods for avoiding liquid crystal molecule twisting through local boundary orientation relevant to the alignment direction of liquid crystal structures. In one embodiment, a segmented polarization control panel may comprise a plurality of segment electrodes corresponding to a plurality of display segments of the sequentially scanning display. The plurality of segment electrodes comprise liquid crystals therein, and are arranged contiguously in a direction of the sequential scan. Electrode boundaries are created between adjacent segment electrodes, where each may be cascaded substantially parallel and perpendicular to a liquid crystal alignment direction of liquid crystals located within the segments. Preventing twisting by the disclosed techniques is particularly attractive in active retarder display systems employing fast striped pi-cell modulators.
1. A segmented polarization control panel (PCP) for use with an electronic stereoscopic display system having a sequentially scanning display, the segmented PCP comprising:
a plurality of segment electrodes corresponding to a plurality of display segments of the sequentially scanning display, the plurality of segment electrodes arranged contiguously in a direction of the sequential scan;
wherein electrode boundaries between adjacent segment electrodes are each oriented substantially parallel and perpendicular to a liquid crystal alignment direction of liquid crystals located within the segments of the segmented PCP.
2. A segmented PCP in accordance with claim 1 , wherein boundary sections of each of the electrode boundaries extending parallel and perpendicular to the liquid crystal alignment direction are cascaded substantially equal in length.
3. A segmented PCP in accordance with claim 1 , wherein boundary sections of each of the electrode boundaries extending parallel and perpendicular to the liquid crystal alignment direction have one or more pseudo-random or one or more unequal lengths.
4. A segmented PCP in accordance with claim 1 , wherein the liquid crystal alignment direction of liquid crystals located within the segments of the segmented PCP is about 45° relative to a length of a segment of the segmented PCP.
5. A segmented PCP in accordance with claim 1 , wherein the segmented PCP is configured for use with an active retarder display system.
6. A segmented PCP in accordance with claim 5 , wherein the active retarder display system employs fast striped pi-cell modulators.
7. A segmented PCP in accordance with claim 1 , wherein segment electrodes on opposing sides of one of the electrode boundaries are configured to receive alternating high and low voltages, respectively, corresponding to the display of alternating left-eye and right-eye images of a stereoscopic image.
8. A method of manufacturing a segmented polarization control panel (PCP) for use with an electronic stereoscopic display system having a sequentially scanning display, the method comprising:
providing a plurality of segment electrodes corresponding to a plurality of display segments of the sequentially scanning display;
arranging the plurality of segment electrodes contiguously in a direction of the sequential scan of the stereoscopic display system;
creating electrode boundaries between adjacent segment electrodes, each of the electrode boundaries oriented substantially parallel and perpendicular to a liquid crystal alignment direction of liquid crystals located within the segments of the segmented PCP.
9. A method in accordance with claim 8 , wherein creating electrode boundaries further comprises creating cascaded boundary sections of each of the electrode boundaries extending parallel and perpendicular to the liquid crystal alignment direction substantially equal in length.
10. A method in accordance with claim 8 , wherein creating electrode boundaries further comprises creating boundary sections of each of the electrode boundaries extending parallel and perpendicular to the liquid crystal alignment direction to have one or more pseudo-random or one or more unequal lengths.
11. A method in accordance with claim 8 , wherein the liquid crystal alignment direction of liquid crystals located within the segments of the segmented PCP is about 45° relative to a length of a segment of the segmented PCP.
12. A method in accordance with claim 8 , wherein providing a plurality of segment electrodes corresponding to a plurality of display segments of the sequentially scanning display further comprises providing a plurality of segment electrodes configured for use with an active retarder display system.
13. A method in accordance with claim 12 , wherein the active retarder display system employs fast striped pi-cell modulators.
14. A method in accordance with claim 8 , wherein providing a plurality of segment electrodes corresponding to a plurality of display segments of the sequentially scanning display further comprises providing segment electrodes on opposing sides of one of the electrode boundaries configured to receive alternating high and low voltages, respectively, corresponding to the display of alternating left-eye and right-eye images of a stereoscopic image.
15. A segmented polarization control panel (PCP) for use with an electronic stereoscopic display system having a sequentially scanning display, the segmented PCP comprising:
a plurality of bottom electrodes corresponding to a plurality of display segments of the sequentially scanning display and arranged contiguously in a direction of the sequential scan;
a common upper electrode shared by the plurality of bottom electrodes, wherein the segmented PCP comprises liquid crystals located between the upper electrode and plurality of bottom electrodes; and
electrode boundaries located between adjacent bottom electrodes, each of the electrode boundaries orthogonally oriented substantially parallel and perpendicular to a liquid crystal alignment direction of the liquid crystals located within the segments of the segmented PCP;
wherein bottom electrodes on opposing sides of one of the electrode boundaries are configured to receive alternating high and low voltages, respectively, corresponding to the display of alternating left-eye and right-eye images of a stereoscopic image.
16. A segmented PCP in accordance with claim 15 , wherein boundary sections of each of the electrode boundaries extending parallel and perpendicular to the liquid crystal alignment direction are cascaded substantially equal in length.
17. A segmented PCP in accordance with claim 15 , wherein boundary sections of each of the electrode boundaries extending parallel and perpendicular to the liquid crystal alignment direction have one or more pseudo-random or one or more unequal lengths.
18. A segmented PCP in accordance with claim 15 , wherein the liquid crystal alignment direction of liquid crystals located within the segments of the segmented PCP is about 45° relative to a length of a segment of the segmented PCP.
19. A segmented PCP in accordance with claim 15 , wherein the segmented PCP is configured for use with an active retarder display system.
20. A segmented PCP in accordance with claim 19 , wherein the active retarder display system employs fast striped pi-cell modulators.