Display device

• US 20060176261A1
• Filed: 03/22/2006
• Published: 08/10/2006
• Est. Priority Date: 03/20/2002
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Tanaka, Yoshinori, Nitta, Hiroyuki, Furuhashi, Tsutomu, Kawabe, Kazuyoshi, Hirakata, Junichi
• Granted Patent: US 7,352,350 B2
• Time in Patent Office: Days
• US Class Current: 345/94
• CPC Class Codes: G09G 2310/0205 Simultaneous scanning of several lines in flat panels
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• CPC Class Codes: G09G 2310/0237 Switching ON and OFF the backlight within one frame
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/10 Special adaptations of display systems for operation with variable images
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

In a hold-type display device, such as a liquid crystal display device, so-called blurring which appears on a profile of a displayed animated image can be suppressed without degrading the brightness of the image. An image based on video data to be inputted to a display device is displayed for every frame period and, thereafter, the image is masked with a blanking image. Here, the ratio between an image display period of the video data and a blanking image display period in one frame period is adjusted, based on the number of pixel rows selected in a pixel array in response to a scanning clock for respective periods, the frequency of the scanning clock, and shortening of a horizontal period of display signal inputting to every pixel row with respect to a horizontal scanning period of the video data, whereby the image can be efficiently cancelled using the blanking image.

Claims

1. A display device comprising:

a pixel array comprising a plurality of pixels;

a plurality of gate lines;

a plurality of video signal lines;

a scanning driver outputting a plurality of scanning signals to the plurality of gate signal lines; and

a data driver outputting a plurality of display signals to the plurality of video signal lines;

wherein the pixel array displays images in a normally black mode,

wherein the scanning driver outputs one the plurality of scanning signals to the plurality of gate signal lines two times in one frame period, and

wherein the data driver outputs the plurality of display signals in response to the selection of respective pixel rows in the first pixel row selection step which is performed every frame period and outputs display signals which display the pixel array darker than the first selection step to respective selected pixel rows in the second selection step of the pixel row.

2. A display device according to claim 1, wherein the scanning driver sequentially outputs the scanning signal which selects N lines (N being a natural number of 2 or more) which are arranged close to each other out of the plurality of gate signal lines in response to a first clock signal for every N other lines of the plurality of gate signal lines.

3. A display device according to claim 1, wherein the data driver outputs the display signal at an interval shorter than a horizontal scanning period of a video data which a display control circuit receives.