Unlock instant, AI-driven research and patent intelligence for your innovation.

Image display device

An image display device and image signal technology, applied in image communication, static indicator, TV, etc., can solve the problem of gray scale reduction

Inactive Publication Date: 2004-11-10
PANASONIC CORP
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the conventional image display device, if the gradation is further limited in order to enhance the effect of suppressing the false contour of the moving image, the pattern used for the dither processing to compensate for the degradation of the image quality will be conspicuous (easy to see), and it can be substantially The number of grayscales represented will be reduced

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image display device
  • Image display device
  • Image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] FIG. 1 is a circuit block diagram of an image display device according to Embodiment 1 of the present invention. The inclination detection unit 21 detects an area with an inclination (gradient) in grayscale (hereinafter referred to as an inclination grayscale area) from the image according to the image signal 10 . The motion detection unit 31 detects an area with motion (movement) from the image based on the image signal 10 . Correction area detection means 41 detects an inclination area where motion occurs by obtaining the logical product of the output of inclination detection means 21 and the output of motion detection means 31, and uses this as a correction area. The gradation correction unit 61 adds a correction value to the image signal 10 to correct a predetermined gradation of the image signal 10 to another gradation.

[0027] Also, the image signal selection section 71 selects the output of the gradation correction section 61 in the active gradient gradation ar...

Embodiment approach 2

[0042] The image display device according to Embodiment 2 of the present invention is the same as the image display device according to Embodiment 1 in that the intermediate non-lighting subfield causing the moving false contour is dispersed into subfields before and after it. The difference from Embodiment 1 is that, compared with Embodiment 1, the grayscale correction unit disperses the maximum intermediate non-lighting subfields in a wider range, and increases the lighting probability of these subfields.

[0043] FIG. 8 is a circuit block diagram of gradation correction unit 62 of the image display device according to Embodiment 2 of the present invention. The difference from Embodiment 1 is that the correction value generation unit 622 generates four correction values ​​-m2, -m1, +m1, +m2 for each gray scale, and the correction value conversion unit 623 converts these four correction values ​​into pixels Units, line units are switched alternately or randomly.

[0044] In ...

Embodiment approach 3

[0050] The image display device according to Embodiment 3 is the same as the image display device according to Embodiment 1 in that the intermediate non-lighting subfields causing the moving false contour are dispersed into subfields before and after it. The difference from Embodiment 1 is that the predetermined gradation to be corrected is limited to the gradation near the intermediate non-lighting subfield having a large luminance weight, or the gradation transition of a lighting subfield having the largest luminance weight.

[0051] Fig. 11 is a graph showing the correction pattern of the grayscale correction unit according to Embodiment 3 of the present invention. Fig. 11A shows the relationship between the grayscale value before correction and the lighting subfield, and Fig. 11B shows the relationship between the grayscale value after correction and Light up the relationship between subfields. In addition, FIG. 11 illustrates only combinations of lighting subfields for gr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An image display device characterized in that an area where the gradation involves grade and which involves a motion is extracted from an image signal, predetermined gradation of the image signal is corrected to another gradation depending on the magnitude or direction of the motion of the area and on the magnitude or direction of the grade of the gradation, and intermediate OFF sub-fields causing moving picture pseudo-contour are dispersed thereby to display an image in which moving picture pseudo-contour is suppressed.

Description

technical field [0001] The present invention relates to an image display device using a subfield (subfield, or subfield), such as a plasma display panel (hereinafter referred to as PDP). Background technique [0002] In general, in an image display device such as a PDP that performs gradation display using sub-fields, noise-like image quality degradation called moving false contours may be observed in moving parts. The animated pseudo-contours arise because the lighting pattern of the subfields does not change continuously with the continuous change of the gray value. For example, it is known that increasing the number of sub-fields can improve the pseudo-contour of animation, but if the number of sub-fields is increased, the time for lighting will be reduced, so that desired brightness cannot be obtained. [0003] Therefore, attempts have been made to suppress animation pseudo-contours by limiting the combination of subfields in active regions without increasing the number...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/291G09G3/20G09G3/28G09G3/296H04N5/14H04N5/21H04N5/70
CPCG09G3/2029G09G3/20G09G2320/0266G09G3/2033H04N5/70G09G3/2803G09G2320/106H04N5/145G09G2320/0261H04N5/21G09G3/291G09G3/296
Inventor 川原功山田和弘
Owner PANASONIC CORP