Electron emission display and driving method thereof

• US 20050243030A1
• Filed: 04/22/2005
• Published: 11/03/2005
• Est. Priority Date: 04/29/2004
• Status: Abandoned Application

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Lee, Sang-Jo, Ahn, Sang-Hyuck, Hong, Su-Bong
• Application Number:
  US11/111,842
• Publication Number:
  US 20050243030A1
• Time in Patent Office: Days
• US Class Current: 345/74.100
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/22 using controlled light sources

Abstract

According to the present invention, the electron emission display includes a display panel, a data electrode driver, a scan electrode driver, and a voltage compensator. The display panel includes a plurality of scan electrodes and data electrodes arranged in a matrix format, and displays an image in response to a voltage applied to the scan electrode and the data electrode. The data electrode driver applies a data signal with first and second voltages to the data electrode. The scan electrode driver applies a third voltage level to a selected scan electrode, and applies a fourth voltage level to a non-selected scan electrode among the plurality of scan electrode. The voltage compensator controls a fourth voltage level by using grayscale information of an image signal.

Claims

1. An electron emission display, comprising:

a display panel for displaying an image in response to voltages applied to scan electrodes and data electrodes that are provided in the display panel in a matrix format;

a data electrode driver for applying a data signal with a first voltage level and a second voltage level to the data electrode;

a scan electrode driver for respectively applying a third voltage level and a fourth voltage level to selected and non-selected scan electrodes of the plurality of scan electrodes; and

a voltage compensator for controlling the fourth voltage level based on grayscale information of an image signal.

2. The electron emission display of claim 1, further comprising:

an image signal processor;

wherein the image signal processor can gamma-correct the image signal and transmit the gamma corrected image signal to the data electrode driver; and

wherein the image signal processor can extract the grayscale information from the image signal and outputting the extracted grayscale information to the voltage compensator.

3. The electron emission display of claim 2, wherein the image signal processor outputs frame-based grayscale information of the image signal to the voltage compensator.

4. The electron emission display of claim 1, wherein the voltage compensator controls the fourth voltage level applied to the non-selected scan electrode frame by frame.

5. The electron emission display of claim 1, wherein the data electrode driver controls a period in which the first voltage level is applied to the data electrode in response to the image signal.

6. The electron emission display of claim 1, wherein the voltage compensator controls the fourth voltage level to be between the first voltage level and the second voltage level.

7. The electron emission display of claim 6, wherein the voltage compensator calculates the fourth voltage level using V4=(V1−

V2)×

td+V2,

where V1 denotes the first voltage level, V2 denotes the second voltage level V4 denotes the fourth voltage level, and td denotes a ratio of a first voltage level period to a scan electrode selection period, the first voltage level period is a period for which the first voltage level is applied to the data electrode.

8. The electron emission display of claim 1, wherein the third voltage level is maintained at a constant level.

9. The electron emission display of claim 1, the voltage compensator further controls, on the basis of the grayscale information of the image signal, the first voltage level applied to the data electrode.

10. An electron emission display, comprising:

a display panel for displaying an image in response to a voltage applied to scan electrodes and data electrodes that are provided in the display panel in a matrix format;

a data electrode driver for applying a data signal corresponding to an image signal to the data electrode; and

a scan electrode driver for applying a scan signal to the scan electrode,

wherein the scan electrode driver controls a voltage level of the scan signal in response to the image signal.

11. The electron emission display of claim 10, wherein the scan electrode driver controls a voltage of a non-selected scan electrode among the plurality of scan electrodes.

12. The electron emission display of claim 10, wherein the scan electrode driver controls the voltage level of the scan signal based on frame-based grayscale information of the image signal.

13. The electron emission display of claim 12, wherein, if the data voltage has a first voltage level and a second voltage level, a voltage applied to the non-selected scan electrode is controlled to be in a voltage range between the first voltage level and the second voltage level.

14. A method for driving a display panel for displaying an image in response to voltages applied to scan electrodes and data electrodes that are provided in the display panel in a matrix format, comprising:

applying a data signal corresponding to an image signal to a data electrode; and

sequentially applying a first voltage level scan pulse to one of a plurality of scan electrodes, and maintaining the scan electrode at a second voltage level;

wherein the second voltage level in one frame is established to be different from the second voltage level in another frame.

15. The method of claim 14, wherein the second voltage level is established based on grayscale information of the image signal.