Driving method and drive control circuit of liquid crystal display device, and liquid crystal display device including the same
First Claim
1. A driving method of a liquid crystal display device, comprising:
- a detection step of detecting a change of a vertical scanning frequency or a horizontal scanning frequency; and
an output step of outputting, when the change of the vertical scanning frequency or the horizontal scanning frequency is detected at the detection step, a gate-on voltage corresponding to the change.
2 Assignments
0 Petitions
Accused Products
Abstract
A drive control circuit supplies a gate voltage so that display quality is not degraded even in a case where a vertical scanning frequency or a horizontal scanning frequency is changed. The circuit includes a timing controller for detecting a change of a horizontal scanning frequency, a gate voltage generating circuit for generating two kinds of gate-on voltages Va and Vb (Va<Vb), and a switch for outputting one of the gate-on voltages Va and Vb from the gate voltage generating circuit in accordance with an output of the timing controller. The timing controller includes a counter for counting the number of clocks for one horizontal period, and a comparator for comparing a count result with a threshold value. When the horizontal scanning frequency is in a normal state, the low gate-on voltage Va is outputted, and when the horizontal scanning frequency exceeds a predetermined threshold value, that is, the count value falls below a threshold value, the high gate-on voltage Vb is outputted.
-
Citations
39 Claims
-
1. A driving method of a liquid crystal display device, comprising:
-
a detection step of detecting a change of a vertical scanning frequency or a horizontal scanning frequency; and
an output step of outputting, when the change of the vertical scanning frequency or the horizontal scanning frequency is detected at the detection step, a gate-on voltage corresponding to the change. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A drive control circuit of a liquid crystal display device, comprising:
-
a detection circuit for detecting a change of a vertical scanning frequency or a horizontal scanning frequency; and
an output circuit for outputting, when the change of the vertical scanning frequency or the horizontal scanning frequency is detected by the detection circuit, a gate-on voltage corresponding to the change. - View Dependent Claims (8, 9, 10, 11, 12, 39)
-
-
13. A driving method of a liquid crystal display device, comprising:
-
a detection step of detecting a change of a vertical scanning frequency or a horizontal scanning frequency; and
an output step of outputting, when the change of the vertical scanning frequency or the horizontal scanning frequency is detected at the detection step, a common voltage corresponding to the change. - View Dependent Claims (14, 15)
-
-
16. A drive control circuit of a liquid crystal display device, comprising:
-
a detection circuit for detecting a change of a vertical scanning frequency or a horizontal scanning frequency; and
an output circuit for outputting, when the change of the vertical scanning frequency or the horizontal scanning frequency is detected by the detection circuit, a common voltage corresponding to the change. - View Dependent Claims (17, 18, 19)
-
-
20. A driving method of a liquid crystal display device, comprising:
-
a detection step of detecting an ambient temperature; and
an output step of outputting, when a change of the ambient temperature is detected at the detection step, a common voltage corresponding to the change. - View Dependent Claims (21, 22)
-
-
23. A drive control circuit of a liquid crystal display device, comprising:
-
a detection circuit for detecting a change of an ambient temperature; and
an output circuit for outputting, when the change of the ambient temperature is detected by the detection circuit, a common voltage corresponding to the detected change. - View Dependent Claims (24, 25, 26)
-
-
27. A driving method of a liquid crystal display device, comprising the step of:
correcting a gradation characteristic by changing a level of a reference voltage for generation of a gradation voltage to be applied to a liquid crystal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36)
-
37. A drive control circuit of a liquid crystal display device, comprising:
a reference voltage generating circuit for changing a level of a reference voltage for generation of a gradation voltage to be applied to a liquid crystal and outputting it. - View Dependent Claims (38)
Specification