Title:
DRIVING CIRCUIT OF LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP3228411
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a driving circuit of a liquid crystal display having a circuit structure without consuming a steady state electric power, a wide range of output voltages, and also a low power consumption.
SOLUTION: A driving circuit of a liquid crystal display is provided with precharge means 15, E5 for precharging an output terminal at a fixed voltage; a 1st circuit 10 having a p-channel insulated gate type transistor 11 whose source is connected with a 1st voltage source E1 and whose drain current is supplied to an output terminal corresponding to its gate bias, and also having a 1st switching means 13 for controlling the supply and cutoff of the drain current to the output terminal; a 2nd circuit 20 having a means for controlling a voltage between the gate and source of the transistor 11 at a threshold voltage, and having a 2nd switching means 50 for switching between an input gradation voltage and the output terminal voltage via a capacitive element for outputting it to the gate of the transistor 11; and a driving means for operating the precharge means, the 1st circuit 10, and the 2nd circuit 20 so as to bring the output terminal voltage close to the input gradation voltage.
Inventors:
Hiroshi Tsuchi
Application Number:
JP6579198A
Publication Date:
November 12, 2001
Filing Date:
March 16, 1998
Export Citation:
Assignee:
NEC
International Classes:
G09G3/36; G02F1/133; G09G3/20; H03K17/687; (IPC1-7): G09G3/36; G02F1/133; G09G3/20; H03K17/687
Domestic Patent References:
| JP11119734A |
Attorney, Agent or Firm:
Kiyoshi Inagaki