1. A driving method of a liquid crystal display device, the method comprising:
generating a first control signal having a change of state at a time delay with respect to a vertical synchronization signal;
applying a scan pulse to gate lines in response to the change of state of the first control signal;
applying data to source lines in response to a change of state of a second control signal;
controlling a backlight unit having a plurality of lamps depending on the change of state of at least one of the first control signal and the second control signal; and
wherein a turn-on time point of a first lamp of the lamps is synchronized with the change of state of at least one of the first control signal and the second control signal.
2. The driving method of a liquid crystal display device according to claim 1, wherein the act of controlling a backlight unit comprises controlling a backlight unit sequentially depending on the change of state of at least one of the first control signal and the second control signal.
3. The driving method of a liquid crystal display device according to claim 1, wherein the change of state of the first or the second control signal is a rising edge of a pulse.
4. The driving method of a liquid crystal display device according to claim 1, wherein the change of state of the first or the second control signal is a falling edge of a pulse.
5. The driving method of a liquid crystal display device according to claim 1, wherein the scan pulse is sequentially applied to a group of gate lines.
6. The driving method of a liquid crystal display device according to claim 1, wherein the second control signal comprises a horizontal synchronization signal.
7. The driving method of a liquid crystal display device according to claim 1, wherein the second control signal comprises a source start pulse.
8. The driving method of a liquid crystal display device according to claim 1, wherein the change of state of the second control signal is time delayed with respect to the vertical synchronization signal.
9. The driving method of a liquid crystal display device according to claim 1, wherein the time delay is greater than or about equal to about a pixel capacitor charging time.
10. The driving method of a liquid crystal display device according to claim 1, wherein the first lamp is turned on depending on the change of state of at least one of the first control signal and the second control signal.
11. The driving method of a liquid crystal display device according to claim 1, wherein the first lamp is turned on for a predetermined period of time.
12. The method according to claim 1, wherein controlling the backlight unit comprises:
determining a turn-on time point of the first lamp on the basis of the change of state of the first or the second control signal;
lighting the first lamp during a lighting duration; and
lighting a second lamp of the plurality of lamps after the lighting duration of the first lamp.
13. The driving method of a liquid crystal display device according to claim 12, wherein the lighting duration is a predetermined period of time.
14. The driving method of a liquid crystal display device according to claim 12, wherein the lighting duration is a predetermined number of changes of state of the second control signal.
15. The driving method of a liquid crystal display device according to claim 12, wherein the turn-on time is delayed with respect to the vertical synchronization signal by at least approximately a pixel capacitor charging time.
16. The driving method of a liquid crystal display device according to claim 12, where the change of state of the second control signal is delayed with respect to the vertical synchronization signal.
17. A liquid crystal display device comprising:
a LCD panel, including gate and data lines;
a backlight unit disposed behind the LCD panel;
an electronics unit, adapted to receive signals including data and a vertical synchronization signal, the electronics unit outputting a first control signal having a time delay with respect to the vertical synchronization signal, and a second control signal associated with a horizontal synchronization signal;
a gate driver for applying a scan pulse to gate lines depending on a change of state of the first control signal;
a source driver for applying data to source lines depending on a change of state of the second control signal;
a driving unit for driving the backlight unit having a plurality of lamps in accordance with the change of state of the first control signal or the second control signal; and
wherein a turn-on time point of a first lamp of the lamps is synchronized with the change of state of at least one of the first control signal and the second control signal.
18. The liquid crystal display device according to claim 17, wherein the scan pulse is sequentially applied to a group of gate lines.
19. The liquid crystal display device according to claim 17, wherein the backlight unit comprises a plurality of lamps.
20. The liquid crystal display device according to claim 19, wherein each lamp is turned on for a predetermined time.
21. The liquid crystal display device according to claim 20, wherein the plurality of lamps are turned on for a varying predetermined times.
22. The liquid crystal display device according to claim 19, wherein the first lamp of the plurality of lamps is turned on based on the change of state of the first control signal or the second control signal.
23. The liquid crystal display device according to claim 22, wherein a second lamp of the plurality of lamps is turned on after the change of state of the first control signal and a predetermined number of changes of state of the second control signal.
24. The liquid crystal display device according to claim 17, wherein the LCD panel comprises pixels, each pixel having a capacitor, the capacitor having a charging time constant, and wherein the change of state of the first control signal with respect to the vertical synchronization signal by a time at least equal to approximately a pixel capacitor charging time constant.
25. The liquid crystal display device according to claim 24, wherein the LCD panel comprises pixels, each pixel having a capacitor, the capacitor having a charging time constant, and wherein the change of state of the second control signal with respect to the horizontal synchronization signal by a time at least equal to approximately a pixel capacitor charging time constant.
26. The liquid crystal display device according to claim 17, wherein the LCD panel comprises pixels, each pixel having a capacitor, the capacitor having a charging time constant, and wherein the change of state of the second control signal with respect to the horizontal synchronization signal by a time at least equal to approximately a pixel capacitor charging time constant.
27. The liquid crystal display device according to claim 22, wherein the first of the plurality of lamps is disposed behind a first predetermined number of gate lines, and the second of the plurality of lamps is disposed behind a second predetermined number of gate lines, and the first lamp is turned on depending on a change of state o the first control signal or the second control signal applied to a first of the second predetermined number of gate lines.
28. The liquid crystal display device according to claim 22, wherein a second lamp is turned on after a predetermined time.
29. The liquid crystal display device according to claim 17, wherein the change of state of the first or the second control signal is a rising edge of a pulse.
30. The liquid crystal display device according to claim 17, wherein the change of state of the first or the second control signal is a falling edge of a pulse.
31. The liquid crystal display device according to claim 17, wherein the control signal is a first gate start pulse following the start of the vertical synchronization signal.
32. The liquid crystal display device according to claim 17, wherein the first control signal comprises a gate start pulse following the start of the vertical synchronization signal.
33. The liquid crystal display device according to claim 17, wherein the second control signal comprises a source start pulse following the start of the horizontal synchronization signal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A magnetic disk apparatus comprising:
a spindle motor for rotating a magnetic disk;
first means for selectively generating either a first pulse-train signal or a second pulse-train signal which differs from the first pulse-train signal in pulse frequency; and
second means for, when the first means generates the first pulse-train signal, controlling the spindle motor to rotate at a first rotational speed in response to the first pulse-train signal, and for, when the first means generates the second pulse-train signal, controlling the spindle motor to rotate at a second rotational speed in response to the second pulse-train signal, the second rotational speed differing from the first rotational speed.
2. A magnetic disk apparatus as recited in claim 1, further comprising:
third means for reading a signal from the magnetic disk;
fourth means for discriminating data from the signal read by the third means;
fifth means for determining whether or not the fourth means normally discriminates the data from the signal read by the third means; and
sixth means for, in cases where the fifth means determines that the fourth means normally discriminates the data, controlling the first means to unchange one of the first and second pulse-train signals which is currently generated by the first means, and for, in cases where the fifth means determines that the fourth means does not normally discriminate the data, controlling the first means to change one of the first and second pulse-train signals which is currently generated by the first means to the other of the first and second pulse-train signals.
3. A magnetic disk apparatus as recited in claim 1, wherein the first means comprises means for generating a fixed-level signal in response to a motor stop signal, and the second means comprises means for, when the first means generates the fixed-level signal, stopping the spindle motor in response to the fixed-level signal.
4. A magnetic disk apparatus comprising:
a spindle motor for rotating a magnetic disk;
first means associated with the spindle motor for generating a first signal having a period which decreases as a rotational speed of the motor increases;
second means for generating a second signal having a train of pulses, wherein a pulse frequency of the second signal is initially equal to a first frequency;
third means for counting pulses in the second signal during every time interval corresponding to the period of the first signal, and generating a third signal depending on a total number of the counted pulses for every time interval corresponding to the period of the first signal;
fourth means for generating a fourth signal representing a deviation of the third signal generated by the third means from a fifth signal being a reference signal;
fifth means for controlling the rotational speed of the spindle motor in response to the fourth signal generated by the fourth means to nullify the deviation of the third signal from the reference signal;
sixth means for reading a sixth signal from the magnetic disk;
seventh means for detecting actual data in the sixth signal read by the sixth means;
eighth means for determining whether or not the seventh means successfully detects the actual data;
ninth means for, when the eighth means determines that the seventh means successfully detects the actual data, maintaining the pulse frequency of the second signal at the first frequency; and
tenth means for, when the eighth means determines that the seventh means does not successfully detect the actual data, changing the pulse frequency of the second signal from the first frequency to a second frequency different from the first frequency to change the rotational speed of the spindle motor which is controlled by the fifth means.