Display device using boosting-on and boosting-off gate driving voltages

• US 9,123,309 B2
• Filed: 03/22/2012
• Issued: 09/01/2015
• Est. Priority Date: 11/25/2011
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Jeon, Jin Young
• Primary Examiner(s): Karimi, Pegeman
• Application Number:
  US13/426,770
• Publication Number:
  US 20130135282A1
• Time in Patent Office: 1,258 Days
• Field of Search: 345 84-104, 345/204, 345/211, 345/212, 345/690
• US Class Current: 1/1
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display device, including a signal controlling unit, a data driving unit, a gate driving voltage generating unit, a gate driving unit, and a display panel. The display panel displays an image during a frame period including a blank period and a display period. The gate driving voltage generating unit receives a control signal and an analog driving voltage. The gate driving voltage generating unit generates boosting-on and boosting-off gate driving voltages based on the analog driving voltage. The gate driving voltage generating unit outputs the boosting-on gate driving voltage during a part of the frame period and the boosting-off gate driving voltage during a remaining of the frame period.

Claims

1. A display device, comprising:

a signal controlling unit to output a plurality of control signals and image data based on a vertical synchronization signal defining a frame period including a blank period and a display period, a horizontal synchronization signal, a clock signal, and a data enable signal;

a data driving unit to receive the image data and to output a data signal converted from the image data during the display period;

a gate driving voltage generating unit to receive a part of the control signals and an analog driving voltage, the gate driving voltage generating unit to output a boosting-on gate driving voltage, generated based on the analog driving voltage, during a boosting-on period corresponding to a part of the frame period and a boosting-off gate driving voltage, generated based on the analog driving voltage, during a boosting-off period corresponding to a remainder of the frame period;

a gate driving unit to output a gate signal during the display period in response to the boosting-on gate driving voltage; and

a display panel to display an image in response to the gate signal and the data signal.

2. The display device as claimed in claim 1, wherein the gate driving voltage generating unit comprises:

a boosting controlling unit to generate a boosting unit operating signal in response to the part of the control signals; and

a boosting unit to receive the analog driving voltage and to output the boosting-on gate driving voltage and the boosting-off gate driving voltage in response to the boosting unit operating signal.

3. The display device as claimed in claim 2, wherein the boosting unit operating signal has a first level during the boosting-on period and a second level different from the first level during the boosting-off period, and the boosting unit is to output the boosting-on gate driving voltage and the boosting-off gate driving voltage according to a level of the boosting unit operating signal.

4. The display device as claimed in claim 3, wherein the boosting-on period corresponds to the display period.

5. The display device as claimed in claim 4, wherein the part of the control signals is generated according to the data enable signal, the data enable signal defines the blank period and the display period, and the boosting controlling unit is to invert a phase of the data enable signal and to generate the boosting unit operating signal having the first level and the second level.

6. The display device as claimed in claim 3, wherein the boosting-on period includes the display period and a part of the blank period.

7. The display device as claimed in claim 6, wherein the part of the control signals is generated according to the vertical synchronization signal, the horizontal synchronization signal, and the clock signal, and the boosting controlling unit decides a first driving period of the boosting unit operating signal, having the first level, corresponding to the display period based on the vertical synchronization signal and the clock signal and a second driving period of the boosting unit operating signal, having the first level, corresponding to the part of the blank period based on the horizontal synchronization signal.

8. The display device as claimed in claim 7, wherein the blank period comprises a first porch period corresponding to a period from a start point of the frame period to a start point of the display period, and a second porch period corresponding to a period from an end point of the display period to an end point of the frame period.

9. The display device as claimed in claim 7, wherein the boosting unit operating signal includes the second driving period having the first level and a non-driving period having the second level corresponding to the blank period, and the second driving period and the non-driving period are alternated during the blank period.

10. The display device as claimed in claim 7, wherein the boosting unit operating signal includes the second driving period having the first level and a non-driving period having the second level corresponding to the blank period, and the second driving period has a length corresponding to plural periods of the horizontal synchronization signal.

11. The display device as claimed in claim 1, wherein the boosting-on period corresponds to the display period.

12. The display device as claimed in claim 11, wherein the blank period comprises a first porch period corresponding to a period from a start point of the frame period to a start point of the display period;

and a second porch period corresponding to a period from an end point of the display period to an end point of the frame period.

13. The display device as claimed in claim 1, wherein the boosting-on period includes a first driving period corresponding to the display period and a second driving period corresponding to a part of the blank period.

14. The display device as claimed in claim 13, wherein the blank period comprises a first porch period corresponding to a period from a start point of the frame period to a start point of the display period;

and a second porch period corresponding to a period from an end point of the display period to an end point of the frame period.

15. The display device as claimed in claim 14, wherein the first porch period and the second porch period include the second driving period, respectively.

16. The display device as claimed in claim 13, wherein the blank period includes the second driving period and a non-driving period, and the second driving period and the non-driving period of the blank period alternate.

17. The display device as claimed in claim 16, wherein a length of the second driving period is substantially or completely equal to a length of the non-driving period.

18. The display device as claimed in claim 1, wherein the display panel comprises:

a plurality of data lines;

a plurality of gate lines isolated from the plurality of data lines and arranged to intersect with the plurality of data lines; and

a plurality of pixels arranged at intersections of the plurality of data lines and the plurality of gate lines, respectively.

19. The display device as claimed in claim 18, wherein each of the plurality of pixels comprises:

a switching element to output the data signal in response to the gate signal; and

a liquid crystal capacitor to receive the data signal and a common voltage having a voltage level different from the data signal.

20. The display device as claimed in claim 1, wherein:

the boosting-on gate driving voltage includes a first gate-on voltage and a first gate-off voltage, the first gate-on voltage is positive, and the first gate-off voltage is negative, and

the boosting-off gate driving voltage includes a second gate-on voltage and a second gate-off voltage, the second gate-on voltage is positive, and the second gate-off voltage is negative.

21. The display device as claimed in claim 1, wherein:

the boosting-on gate driving voltage includes a first gate-on voltage and a first gate-off voltage, and

the boosting-off gate driving voltage includes a second gate-on voltage and a second gate-off voltage, wherein;

the first gate-on voltage is higher than the second gate-on voltage, and

the first gate-off voltage is lower than the second gate-off voltage.

22. The display device as claimed in claim 1, wherein:

the boosting-on gate driving voltage includes a first gate-on voltage and a first gate-off voltage, and the first gate-on voltage and the first gate-off voltage are transferred to the gate driving unit through respective lines and

the boosting-off gate driving voltage includes a second gate-on voltage and a second gate-off voltage, and the second gate-on voltage and the second gate-off voltage are transferred to the gate driving unit through the respective lines.

23. A display device, comprising:

a signal controlling unit to output image data;

a gate driving unit to output a gate signal during a display period of a frame period including the display period and a blank period;

a data driving unit to convert the image data into a data signal and to output the data signal during the display period;

a gate driving voltage generating unit to receive an analog driving voltage and to output a boosting-on gate driving voltage, generated based on the analog driving voltage, to the gate driving unit during a boosting-on period corresponding to a part of the frame period and a boosting-off gate driving voltage, generated based on the analog driving voltage, to the gate driving unit during a boosting-off period corresponding to a remainder of the frame period; and

a display panel to display an image in response to the gate signal and the data signal.