Display driving method and integrated driving apparatus thereof

Patent metadata

Field	Value
Publication number	US-9613554-B2
Application number	US-201313949665-A
Country	US
Kind code	B2
Filing date	Jul 24, 2013
Priority date	Sep 24, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A driving method of a display device includes: determining each of a plurality of pixel rows of the display device as one of a motion picture display pixel row and a still image display pixel row by comparing image data of each of the pixel rows in a current frame and in a previous frame; and driving the motion picture display pixel row with a motion picture frequency and driving the still image display pixel row with a still image display frequency, which is lower than or equal to the motion picture frequency, where a plurality of still image display pixel rows are driven with at least two still image display frequencies.

First claim

What is claimed is:

1. A method of driving a display device, the method comprising:
determining each of a plurality of pixel rows of the display device as one of a motion picture display pixel row and a still image display pixel row by comparing image data of each of the pixel rows in a current frame and in a previous frame; and
driving the motion picture display pixel row with a motion picture frequency and driving the still image display pixel row with a still image display frequency, which is lower than or equal to the motion picture frequency,
wherein a plurality of still image display pixel rows are driven with at least two still image frequencies are two different frequencies from each other, all of which are lower than the motion picture frequency, and
wherein the plurality of still image display pixel rows include a first pixel row which is driven with a first still image display frequency and a second pixel row which is driven with a second still image display frequency, the first pixel row is closer to the motion picture display pixel row than the second pixel row, and the first still image display frequency is greater than the second still image display frequency.

2. The method of claim 1 , wherein
the motion picture display pixel row comprises a motion picture display area and a refresh region, which are disposed along a same gate line.

3. The method of claim 1 , wherein
the determining each of the pixel rows of the display device as one of the motion picture display pixel row and the still image display pixel row by the comparing the image data of the current frame and the image data of the previous frame comprises:
outputting the image data of the previous frame, which is stored in a frame memory of the display device, to a comparator of the display device, and storing the image data of the current frame to the frame memory of the display device; and
comparing the image data of the current frame and the image data of the previous frame using the comparator.

4. The method of claim 3 , wherein
the image data in the current frame and the image data in the previous frame are compared for each of the pixel rows in the comparator to compare whether the still image or the motion picture is displayed for each of the pixel rows.

5. The method of claim 4 , further comprising:
storing data corresponding to a result of the comparison in the comparator to a line buffer memory of the display device.

6. The method of claim 5 , wherein
the data which is output from the comparator and is stored to the line buffer memory is data of two bits, wherein zero (0) represents the still image and 1 represents the motion picture.

7. The method of claim 4 , wherein
when the still image display pixel row is disposed between two motion picture display pixel rows, the still image display pixel row is operated with the motion picture frequency.

8. The method of claim 4 , wherein
the driving the motion picture display pixel row with the motion picture frequency and the driving the still image display pixel row with the still image display frequency comprises controlling transmission of a gate-on voltage to a gate line of the display device using an output enable signal.

9. The method of claim 8 , wherein
when the gate-on voltage is not applied to a pixel connected to the gate line based on the output enable signal, a data voltage is controlled not to be applied to the pixel.

10. The method of claim 1 , wherein
the driving of the still image display pixel row with the still image display frequency, which is lower than or equal to the motion picture frequency comprises:
analyzing an optimization still image display frequency;
determining an upper still image display frequency for the still image display pixel rows in an upper still image display area positioned above the motion picture pixel row; and
determining a lower still image display frequency for the still image display pixel rows in a lower still image display area positioned below the motion picture pixel row.

11. The method of claim 10 , wherein
the analyzing the optimization still image display frequency comprises:
calculating a representative value based on an image pattern of the still image display pixel row; and
selecting the optimization still image display frequency from a lookup table of the display device based on the calculated representative value.

12. The method of claim 11 , wherein
each of the determining the upper still image display frequency and the determining the lower still image display frequency comprises:
calculating a representative value of a corresponding still image display pixel row; and
selecting the upper still image display frequency and the lower still image display frequency from the lookup table based on the calculated representative value of the corresponding still image display pixel row.

13. The method of claim 12 , wherein
each of the determining the upper still image display frequency and the determining the lower still image display frequency further comprises calculating a weight value of the corresponding still image display pixel row, and
the upper still image display frequency and the lower still image display frequency are selected from the lookup table based on a value acquired by multiplying the weight value and the calculated representative value of the corresponding still image display pixel row.

14. The method of claim 10 , wherein
the still image display frequency of the still image display pixel row in the upper still image display area is gradually increased from the upper still image display frequency to the motion picture frequency as the still image display pixel row goes toward the motion picture display pixel row, and
the still image display frequency of the still image display pixel rows in the lower still image display area is gradually increased from the lower still image display frequency to the motion picture frequency as the still image display pixel row goes toward the motion picture display pixel row.

15. The method of claim 14 , wherein
the still image display frequency is increased nonlinearly from the upper still image display frequency to the motion picture frequency and from the lower still image display frequency to the motion picture frequency.

16. The method of claim 10 , wherein
when the upper still image display frequency or the lower still image display frequency is lower than the optimization still image display frequency, a corresponding still image display pixel row is operated with the optimization still image display frequency.

17. A driving apparatus of a display device comprising:
a still image/motion picture determining unit which receives an image data input from outside and determines whether a pixel row corresponding to the image data is a motion picture display pixel row or a still image display pixel row;
a representative value calculating unit which calculates a representative value for each pixel row;
a lookup table which stores a frequency corresponding to the representative value; and
a driving frequency determining unit which determines whether the frequency corresponding to the representative value from the lookup table is appropriate to determine a final driving frequency,
wherein the motion picture display pixel row is driven with a motion picture frequency,
the still image display pixel row is driven with a still image display frequency, which is lower than or equal to the motion picture frequency,
a plurality of the still image display pixel rows are driven with at least two still

Assignees

• Samsung Display Co Ltd

Inventors

• Jang Dae-Gwang
• Min Ung Gyu
• Hong Seok Ha
• Hwang Hyun Sik
• Kim Byung Sun
• Kim Sang Mi
• You Bong Hyun
• Seo Ji Myoung

Classifications

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2310/0213

  controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power · CPC title

• G09G2320/103

  Detection of image changes, e.g. determination of an index representative of the image change · CPC title

• G09G2310/04

  Partial updating of the display screen · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title