1. A method for driving an active matrix liquid crystal display device comprising plural pixel thin film transistors and a liquid crystal which has a V-shaped electrooptical characteristic, comprising the steps of:
applying a first picture signal to a first sub-frame so that a first picture display is performed;
applying a second picture signal having an opposite polarity to the first picture signal to a second sub-frame so that a second picture display is performed; and
applying a reset signal to a third sub-frame after applying the second picture signal so that a black picture display is performed.
2. A method according to claim 1 wherein each of the first and second picture signals and the reset signal is applied to a corresponding pixel element of the liquid crystal display device.
3. A method according to claim 1 wherein digital video data are converted into the first and second picture signals and the reset signal.
4. A method according to claim 1 wherein the liquid crystal display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a rear-type projector, a front-type projector, a head-mounting display device, a car navigator, a personal computer and a portable information terminal.
5. A method according to claim 1 wherein the liquid crystal comprises an antiferroelectric liquid crystal.
6. A method according to claim 1 wherein the first picture signal, the second picture signal and the reset signal are applied to the pixel thin film transistors.
7. A method for driving an active matrix liquid crystal display device comprising plural pixel thin film transistors and a liquid crystal which has a V-shaped electrooptical characteristic, comprising the steps of:
applying a first picture signal to a first sub-frame;
applying a second picture signal to a second sub-frame; and
applying a reset signal to a third sub-frame so that a black picture display is performed,
wherein the first and second picture signals are equal to each other in absolute value and opposite to each other in polarity.
8. A method according to claim 7 wherein each of the first and second picture signals and the reset signal is applied to a corresponding pixel element of the liquid crystal display device.
9. A method according to claim 7 wherein digital video data are converted into the first and second picture signals and the reset signal.
10. A method according to claim 7 wherein the liquid crystal display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a rear-type projector, a front-type projector, a head-mounting display device, a car navigator, a personal computer and a portable information terminal.
11. A method according to claim 7 wherein the liquid crystal comprises an antiferroelectric liquid crystal.
12. A method according to claim 7 wherein the first picture signal, the second picture signal and the reset signal are applied to the pixel thin film transistors.
13. A method for driving an liquid crystal display device comprising a liquid crystal which has a V-shaped electrooptical characteristic, comprising the step of:
providing picture signals with active matrix elements;
wherein one frame in each of the picture signals is constituted by n sub-frames (n stands for a natural number of 2 or greater),
wherein a reset signal is applied so that a black display is performed during m sub-frames of the n sub-frames (1\u2266m<n, m stands for a natural number),
wherein first and second picture signals are applied during (n\u2212m) sub-frames, and
wherein the second picture signal has an opposite polarity to the first picture signal.
14. A method according to claim 13 wherein each of the picture signals are applied to a corresponding pixel TFT of the liquid crystal display device.
15. A method according to claim 13 wherein digital video data are converted into the picture signals.
16. A method according to claim 13 wherein the liquid crystal display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a rear-type projector, a front-type projector, a head-mounting display device, a car navigator, a personal computer and a portable information terminal.
17. A method according to claim 13 wherein the liquid crystal comprises an antiferroelectric liquid crystal.
18. A method according to claim 13 wherein the liquid crystal display device is an active matrix display device in which the first signal, the second signal and the reset signal are applied to a thin film transistor in each pixel.
19. A method for driving a liquid crystal display device comprising a liquid crystal which has a V-shaped electrooptical characteristic, comprising the step of:
providing picture signals with active matrix elements;
wherein one frame in each of the picture signals is constituted by n sub-frames (n stands for a natural number of 2 or greater),
wherein a black display by a reset signal is performed during m sub-frames of the n sub-frames (1\u22668 m<n, m stands for a natural number),
wherein displays by at least first and second picture signals are performed during (n\u2212m) sub-frames,
wherein the second picture signal has an opposite polarity to the first picture signal, and
wherein the reset signal is applied after the second picture signal was applied.
20. A method according to claim 19 wherein each of the picture signals is applied to a corresponding pixel element of the liquid crystal display device.
21. A method according to claim 19 wherein digital video data are converted into the picture signals.
22. A method according to claim 19 wherein the liquid crystal display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a rear-type projector, a front-type projector, a head-mounting display device, a car navigator, a personal computer and a portable information terminal.
23. A method according to claim 19 wherein the liquid crystal comprises an antiferroelectric liquid crystal.
24. A method according to claim 19 wherein the liquid crystal display device is an active matrix display device in which the first signal, the second signal and the reset signal are applied to a thin film transistor in each pixel.
25. A method for driving an active matrix liquid crystal display device comprising plural pixel thin film transistors and a liquid crystal which has a V-shaped electrooptical characteristic, comprising the step of:
forming a display of a picture in one frame by displays in a plurality of sub-frames,
wherein the displays in a plurality of the sub-frames are formed in such a manner that picture signals which are equal to each other in absolute value and opposite to each other in polarity, and
wherein a display of black is formed by applying a reset signal to at least one of a plurality of the sub-frames.
26. A method according to claim 25 wherein each of the picture signals is applied to a corresponding pixel element of the liquid crystal display device.
27. A method according to claim 25 wherein digital video data are converted into the picture signals.
28. A method according to claim 25 wherein the liquid crystal display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a rear-type projector, a front-type projector, a head-mounting display device, a car navigator, a personal computer and a portable information terminal.
29. A method according to claim 25 wherein the liquid crystal comprises an antiferroelectric liquid crystal.
30. A method according to claim 25 wherein the picture signals and the reset signal are applied to the pixel thin film transistors.
31. A method for driving an active matrix liquid crystal display device comprising plural pixel thin film transistors and a liquid crystal which has a V-shaped electrooptical characteristic, comprising the step of:
forming a display of a picture in one frame by applying picture signals to m sub-frames (m stands for a natural number),
wherein a display of black is performed (n stands for a natural number, and m>n) by applying a reset signal to at least n sub-frames of the m sub-frames, and
wherein the picture signals are equal to each other in absolute value but opposite to each other in polarity.
32. A method according to claim 31 wherein each of the picture signals is applied to a corresponding pixel element of the liquid crystal display device.
33. A method according to claim 31 wherein digital video data are converted into the picture signals.
34. A method according to claim 31 wherein the liquid crystal display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a rear-type projector, a front-type projector, a head-mounting display device, a car navigator, a personal computer and a portable information terminal.
35. A method according to claim 31 wherein the picture signals and the reset signal are applied to the pixel thin film transistors.
36. A method according to claim 31 wherein the liquid crystal comprises an antiferroelectric liquid crystal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A liquid pumping device, comprising:
a barrel;
a cylinder mounted in the barrel;
a conducting rod movably mounted in the cylinder and having an upper end protruding outward from the barrel, an inside formed with a conducting hole and a lower end provided with a oneway valve to allow fluid in the cylinder to flow upward into the conducting hole only;
a piston movably mounted in the cylinder and secured on the lower end of the conducting rod to move therewith, the piston having a peripheral wall formed with a plurality of oneway valves to allow fluid in an upper portion of the cylinder to flow downward into a lower portion of the cylinder only; and
an operation lever secured on the upper end of the conducting rod and having an inside formed with an air channel, the air channel of the operation lever having a mediate portion formed with a reduced neck provided with a pressure release valve having an inside formed with a valve hole communicating with the air channel of the operation lever and the conducting hole of the conducting rod.
2. The liquid pumping device in accordance with claim 1, wherein the valve hole of the pressure release valve has a dimension smaller than that of the air channel of the operation lever.
3. The liquid pumping device in accordance with claim 1, wherein the valve hole of the pressure release valve has a narrower first end and a wider second portion.
4. The liquid pumping device in accordance with claim 1, further comprising an urging ring mounted between the pressure release valve and the reduced neck of the operation lever.
5. The liquid pumping device in accordance with claim 1, wherein the air channel of the operation lever has a first end provided with an air inlet nozzle and a control switch and a second end provided with a muffler.
6. The liquid pumping device in accordance with claim 1, wherein the piston is formed with a through hole mounted on the lower end of the conducting rod.
7. The liquid pumping device in accordance with claim 6, further comprising a nut screwed onto the lower end of the conducting rod and rested on the piston.
8. The liquid pumping device in accordance with claim 1, further comprising a cover mounted on the top of the barrel and having a first end face formed with a handle formed with a through hole to allow passage of the conducting rod and a second end face formed with a lug inserted into an upper end of the cylinder.
9. The liquid pumping device in accordance with claim 8, wherein the lug of the cover has an inside formed with a conducting channel mounted on the conducting rod and connected to the inside of the cylinder.
10. The liquid pumping device in accordance with claim 9, wherein the cover has a side formed with a conducting groove having a first end connected to the conducting channel of the lug and a second end formed with an insertion recess for mounting a fixing ring, and the liquid pumping device further comprises an operation shaft movably mounted on the fixing ring and having a first end rested on the fixing ring and a second end protruding outward from the fixing ring, an adjusting knob secured on the second end of the operation shaft, and an elastic member mounted on the operation shaft and biased between the fixing ring and the adjusting knob.
11. The liquid pumping device in accordance with claim 10, wherein the conducting groove of the cover has a mediate portion formed with a through hole connected to the inside of the barrel and provided with a float.
12. The liquid pumping device in accordance with claim 8, further comprising a mounting ring mounted between the lug of the cover and the conducting rod.
13. The liquid pumping device in accordance with claim 1, wherein the barrel has a top formed with a suction hole for mounting a suction pipe which is mounted in the suction hole of the barrel by a seal.
14. The liquid pumping device in accordance with claim 1, wherein the sealing ring is mounted on a lower end of the cylinder.