Image display apparatus and image display method

• US 20050017991A1
• Filed: 06/22/2004
• Published: 01/27/2005
• Est. Priority Date: 07/08/2003
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Kurumisawa, Takashi, Ishida, Masanori, Yamazaki, Katsunori
• Granted Patent: US 7,319,449 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2300/0885 Pixel comprising a non-linear two-terminal element alone in series with each display pixel element
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 3/2051 with use of a spatial dither pattern
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

An aspect of the invention provides an image display apparatus that displays a plurality of input pixels which form input image data on a display section. In that case, each input pixel can be displayed in such a manner that display pixels having gradation values differing from the gradation value of the input pixel are combined. For example, when a pixel having a particular gradation value exists as an input pixel, the pixel is not displayed on the display section as it is being kept at the gradation value, but instead, is displayed in such a manner that a plurality of display pixels having gradation values differing from the gradation value of the input pixel are combined. As a result, the same gradation value is not displayed continuously. Therefore, this results in that the occurrence of crosstalk, which is problematical particularly in a TFD liquid-crystal panel, is reduced. Accordingly, the invention can remove crosstalk which is likely to occur in a TFD liquid-crystal panel by controlling the gradation level of a display image.

Claims

1. An image display apparatus, comprising:

a display section; and

display control device that displays, on said display section, a plurality of input pixels which form input image data in such a manner that a plurality of display pixels having gradation values differing from gradation values of the input pixels are combined.

2. The image display apparatus according to claim 1, said plurality of display pixels containing a first display pixel having a gradation value greater than the gradation value of said input pixels and a second display pixel having a gradation value less than the gradation value of said input pixels.

3. The image display apparatus according to claim 1, said plurality of display pixels being displayed so as to be adjacent to a direction of scanning lines on said display section.

4. The image display apparatus according to claim 1, said display control device further comprising:

a driving device that drives a pixel area of said display section on the basis of a driving pulse signal specified by a number of gradation control pulses corresponding to the gradation values of the display pixels; and

a device that displays said plurality of display pixels by controlling said gradation control pulses.

5. The image display apparatus according to claim 1, said input image data being moving-image data formed of a plurality of frame images, and

said display control device further comprising a switching control device that switches and displays, for each of the frame images, a first combination of said plurality of display pixels and a second combination of said plurality of display pixels, which differ from each other.

6. The image display apparatus according to claim 5, said display control device further including a driving device that drives a pixel area of said display section on the basis of a driving pulse signal specified by the number of gradation control pulses corresponding to the gradation values of the display pixels, and

said switching control device displaying the first combination of said plurality of display pixels and the second combination of said plurality of display pixels by controlling said gradation control pulses.

7. The image display apparatus according to claim 5, said switching control device further including a device that generates the first combination of said plurality of display pixels and the second combination of said plurality of display pixels on a basis of said input image data.

8. The image display apparatus according to claim 5, the first combination of said plurality of display pixels being formed in such a manner that display pixels whose gradation values are greater than those of said input pixels and display pixels whose gradation values are less than those of said input pixels are alternately arranged in a direction of the scanning lines of said display section, and

the second combination of said plurality of display pixels being formed in such a manner that display pixels whose gradation values are greater than those of said input pixels and display pixels whose gradation values are less than those of said input pixels are alternately arranged in sequences reverse to the first combination of said plurality of display pixels in the direction of the scanning lines of said display section.

9. The image display apparatus according to claim 5, the first combination of said plurality of display pixels and the second combination of said plurality of display pixels being formed in such a manner that subpixels whose gradation values are greater than a predetermined value and subpixels whose gradation values are less than the predetermined value are alternately arranged in units of subpixels which form each of the display pixels in a direction of the scanning lines of said display section.

10. An image display apparatus according to claim 1, said input image data being moving-image data formed of a plurality of frame images, and

said display control device further including a switching control device that switches and displays, for each of said frame images, one of the combinations of an odd number of different types of said plurality of display pixels.

11. An image display apparatus according to claim 10, said display control device further comprising a driving device that drives a pixel area of said display section on a basis of a driving pulse signal specified by a number of gradation control pulses corresponding to the gradation values of the display pixels, and

said switching control device displaying a combination of said plurality of display pixels by controlling said gradation control pulses.

12. The image display apparatus according to claim 10, said plurality of types being of three types.

13. An image display method for use in an image display apparatus having a display section, said image display method comprising:

inputting input image data formed of a plurality of input pixels; and

displaying said plurality of input pixels on said display section in such a manner that a plurality of display pixels having gradation values differing from gradation values of the input pixels are combined.