Liquid crystal display device and driving method thereof, and mobile terminal having the same

• US 20080043011A1
• Filed: 05/16/2007
• Published: 02/21/2008
• Est. Priority Date: 07/10/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Hye Jin, Lee, Sung Hyup, Lee, Jae Ser
• Granted Patent: US 8,502,812 B2
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/04 Display protection
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A liquid crystal display (LCD) device of a mobile terminal and a driving method of the LCD device are provided, including an LCD panel for presenting images, driver ICs for driving the LCD panel, and a system controller for comparing a measured signal with a normal state signal and initializing the driver ICs according to a difference between the measured signal and the normal state signal.

Claims

1. A liquid crystal display (LCD) device comprising:

an LCD panel for presenting images;

a driver IC for driving the LCD panel;

a controller for comparing a signal generated at the driver IC with a normal state signal and initializing the driver IC according to a difference between the signal generated by the driver IC and the normal state signal.

2. The LCD device of claim 1, wherein the driver IC comprises:

a data driver for providing data signals to data lines of the LCD panel;

a gate driver for providing high gate voltage and low gate voltage to gate lines of the LCD panel;

a common voltage generator for providing a common voltage through a common electrode of the LCD panel; and

a voltage source for supplying a reference signal to the LCD panel and the driver.

3. The LCD device of claim 2, wherein the signal generated by the driver IC is at least one of a high gate voltage, low gate voltage or a reference signal.

4. The LCD device of claim 1, wherein the controller initializes the driver by initializing a power-on sequence of the voltage source.

5. The LCD device of claim 1 further comprises a detection circuit for detecting a signal generated by the driver IC and for transmitting the detected signal to the controller.

6. The LCD device of claim 5, wherein the detection circuit modifies a level of the signal generated by the driver IC to a selected level to be processed by the system controller.

7. A mobile device comprising:

a liquid crystal display (LCD) device for displaying images;

an abnormal signal detection circuit for measuring signals generated by the LCD device;

a system controller for comparing a measured signal level with a normal state signal level and initializing the LCD device according to a difference between the measured signal level and the normal state signal level; and

a system power source for supplying power to the LCD device.

8. The mobile device of claim 7, wherein the LCD device comprises:

an LCD panel for presenting images;

a data driver for providing data signals to data lines of the LCD panel;

a gate driver for providing high gate voltage and low gate voltage to gate lines of the LCD panel;

a common voltage generator for providing a common voltage through a common electrode of the LCD panel; and

a voltage source for supplying a reference signal to at least one of the LCD panel, the data driver, gate driver, and common voltage generator.

9. The mobile device of claim 7, wherein the abnormal signal detection circuit measures at least one of a gate high voltage, a gate low voltage, and a reference signal.

10. The mobile device of claim 7, wherein the LCD device is initialized by initializing a power-on sequence of the voltage source.

11. The mobile device of claim 7, wherein the abnormal signal detection circuit transmits the measured signals to the system controller.

12. The mobile device of claim 11, wherein the detection circuit modifies a level of the signal generated by the LCD device to a selected level which can be processed by the system controller.

13. A method for driving a liquid crystal display (LCD) device, comprising:

measuring a voltage level of a signal provided to an LCD panel of the LCD device;

comparing the measured voltage level with a reference voltage level of a normal state of the LCD panel; and

initializing the signal provided to a voltage source of the LCD panel if the measured voltage level differs from the reference voltage level.

14. The method of claim 13, wherein the signal comprises at least one of a gate high voltage, a gate low voltage provided to gate lines, and a reference signal generated by a voltage source.

15. The method of claim 13, further comprising predicting an occurrence of a black or white effect of the LCD panel if the measured voltage level differs from the reference voltage level.

16. The method of claim 13, wherein the initializing signal provided to the LCD panel comprises initializing power-on sequence of the voltage source supplying the voltage.

17. A method of driving a liquid crystal display (LCD) device, the method comprising:

measuring at least one signal generated by a driver driving an LCD panel of the LCD device;

comparing a measured signal with a normal state signal;

activating the driver when a difference between the measured signal and the normal state signal is not in a tolerable range; and

predicting an occurrence of at least one of a black and white effect when the difference between the measured signal and the normal state signal is not in a tolerable range.

18. A method of claim 17, wherein the activating of the driver comprises at least one of initializing a power on sequence of a voltage source in the driver and resetting the power on sequence of the voltage source in the driver in accordance with a control signal.