1. A stereoscopic display, comprising: a display unit, comprising a plurality of pixels arranged in a plurality of pixel rows and a plurality of pixels columns comprising: a first display zone and a second display zone, wherein said display unit updates a first display zone before updating said second display zone; an odd set of pixel columns; and an even set of pixel columns; wherein a scan line updates each pixel row in series to alternate between: an LR frame, displaying an LR mode wherein said odd set of pixel columns display left eye data and said even set of pixel columns display right eye data; and an RL frame, displaying an RL mode wherein said odd set of pixel columns display right eye data and said even set of pixel columns display left eye data; a light shield, disposed in front of said display unit, comprising: a first shielding unit, configured to block said even set of pixel columns from a left eye of a viewer and to block said odd set of pixel columns from a right eye of the viewer when said first shielding unit is disabled; and a second shielding unit, configured to block said odd set of pixel columns from said left eye of the viewer and to block said even set of pixel columns from said right eye of the viewer when said second shielding unit is disabled; and a backlight module, disposed behind said display unit, comprising a plurality of mutually exclusive light source groups that illuminate alternatively, each light source group corresponding to a discrete subset of adjacent pixel rows, wherein only the farthest light source group from said scan line illuminates an illuminated set of pixel rows, a top scan line being considered adjacent to a bottom scan line; wherein said first shielding unit is disabled when said illuminated set of pixel rows display said LR mode and enabled when said illuminated set of pixel rows display said RL mode, and said second shielding unit is disabled when said illuminated set of pixel rows display said RL mode and enabled when said illuminated set of pixel rows display said LR mode, wherein after said first display zone is updated, then a first light source group of said plurality of mutually exclusive light source groups is enabled to illuminate said first display zone, and wherein after said second display zone is updated, then a second light source group of said plurality of mutually exclusive light source groups is enabled to illuminate said second display zone.
2. The stereoscopic display of claim 1 , wherein said plurality of light source groups consists of: the first light source group, corresponding to the upper half of said pixel rows, wherein said first light source group is not illuminated when said scan line updates said upper half of said pixel rows; and the second light source group, corresponding to the lower half of said pixel rows, wherein said second light source group is not illuminated when said scan line updates said lower half of said pixel rows.
said first light source group is illuminated when said scan line updates said third quarter of said pixel rows, said second light source group is illuminated when said scan line updates said bottom quarter of said pixel rows, said third light source group is illuminated when said scan line updates said upper quarter of said pixel rows, and said fourth light source group is illuminated when said scan line updates said second quarter of said pixel rows.
4. The stereoscopic display of claim 1 , wherein said display unit is updated alternatively with a first voltage data and a second voltage data.
5. The stereoscopic display of claim 4 , wherein said first shielding unit shields said first voltage data; and said second shielding unit shields said second voltage data.
6. The stereoscopic display of claim 4 , wherein said first voltage data represents said LR frame, and said second voltage data represents said RL frame.
7. The stereoscopic display of claim 1 further comprising: a first polarization plate, transmitting light with a first polarizing direction; and a second polarization plate, transmitting light with a second polarizing direction that is different from the first polarizing direction.
8. The stereoscopic display of claim 7 , wherein said first polarizing direction is perpendicular to said second polarizing direction.
9. The stereoscopic display of claim 7 further comprising: a third polarization plate, transmitting light with a third polarizing direction different from said second polarizing direction; and a barrier, disposed between said second polarization plate and said third polarization plate.
10. The stereoscopic display of claim 9 , wherein said second polarizing direction is perpendicular to said third polarizing direction.
11. A method of driving a stereoscopic display, comprising: providing a stereoscopic display, comprising: a display unit, comprising a plurality of pixels arranged in a plurality of pixel rows and a plurality of pixels columns comprising: a first display zone and a second display zone; an odd set of pixel columns; and an even set of pixel columns; a light shield, comprising: a first shielding unit; and a second shielding unit; a backlight module, comprising a plurality of mutually exclusive light source groups that illuminate alternatively, each light source group corresponding to a discrete subset of adjacent pixel rows; an LR mode updating step, comprising: disabling said first shielding unit to block said odd set of pixel columns from a right eye of a viewer and to block said even set of pixel columns from a left eye of the viewer; and updating each pixel row in series by a scan line to display an LR mode wherein said odd set of pixel columns display left eye data and said even set of pixel columns display right eye data; and an RL mode updating step, comprising: disabling said second shielding unit to block said odd set of pixel columns from said left eye and to block said even set of pixel columns from said right eye; and updating each pixel row in series by said scan line to display an RL mode wherein said odd set of pixel columns display right eye data and said even set of pixel columns display left eye data, wherein said LR mode updating step and said RL mode updating step alternate, and only the light source group of said plurality of light source groups corresponding to the discrete subset of adjacent pixel rows that is farthest from said scan line illuminates, a top scan line is being considered adjacent to a bottom scan line.
12. The method of claim 11 , wherein said plurality of light source groups consists of: a first light source group, corresponding to the upper half of said pixel rows, wherein said first light source group is not illuminated when said scan line updates said upper half of said pixel rows; and a second light source group, corresponding to the lower half of said pixel rows, wherein said second light source group is not illuminated when said scan line updates said lower half of said pixel rows.
said first light source group is illuminated when said scan line updates said third quarter of said pixel rows, said second light source group is illuminated when said scan line updates said bottom quarter of said pixel rows, said third light source group is illuminated when said scan line updates said upper quarter of said pixel rows, and said fourth light source group is illuminated when said scan line updates said second quarter of said pixel rows.
14. The method of claim 11 , further comprising alternatively updating said display unit with a first voltage data and a second voltage data.
15. The method of claim 14 , further comprising: shielding said first voltage data with said first shielding unit; and shielding said second voltage data with said second shielding unit.
16. The stereoscopic display of claim 14 , wherein said first voltage data represents a first frame displaying said LR mode, and said second voltage data represents a second frame displaying said RL mode.
17. The method of claim 11 further comprising: providing a first polarization plate and a second polarization plate; transmitting light through the first polarization plate with a first polarizing direction; and transmitting light through the second polarization plate with a second polarizing direction that is different from the first polarizing direction.
18. The method of claim 17 , wherein said first polarizing direction is perpendicular to said second polarizing direction.
19. The method of claim 17 further comprising: providing a third polarization plate; providing a barrier, disposed between said second polarization plate and said third polarization plate; and transmitting light through the third polarization plate with a third polarizing direction that is different from said second polarizing direction.
20. The method of claim 19 , wherein said second polarizing direction is perpendicular to said third polarizing direction.
