Video display device and color temperature correction method for the same
Inactive Publication Date: 2005-11-10
HITACHI LTD
View PDF10 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The solution allows for more accurate color temperature correction of both pure and approximate white colors, resulting in more visually appealing and beautiful video pictures by effectively addressing the limitations of prior art in handling approximate white colors.
Problems solved by technology
However, the above prior art is not so arranged as increasing the color temperature of the approximate white color, which does not meet such requirement as mentioned above.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0030] Hereinafter, the preferred embodiments of the present invention are described below with reference to the accompanying drawings. FIG. 1 is a block diagram to show one embodiment of the signal processing circuit for the video display device according to the present invention. The R, G and B primary colors signals, which are input to an R terminal 11, a G terminal 12 and a B terminal 13 respectively, are supplied to an A / D conversion circuit 14 so as to be converted into digital signals. A matrix conversion circuit 15 subjects the three primary colors signals (R, G, B) in digital form as output from the A / D conversion circuit 14 to matrix conversion processing so as to convert the same signals into a luminance signal Y as well as color difference signals (R-Y) and (B-Y), which luminance signal Y is output to a detection circuit 17 and an inverse matrix conversion circuit 27 respectively and which color difference signals (R-Y) and (B-Y) are output to a hue conversion circuit 18...
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
Login to View More Abstract
A video display device that allows the color temperature of the signals in white color attributes having high luminance and low chroma saturation to be corrected with high precision is provided together with the color temperature correction method for the same so as to visually obtain a desirable white color on display. The signal processing circuit for the color temperature correction according to this invention comprises an A / D converter to convert the video signals as input into digitalized signals, a matrix circuit to convert the digitalized signals as output from said A / D converter into luminance signals and at least two color difference signals, a hue conversion circuit to obtain hue signals from the color difference signals as output from said matrix circuit, a hue correction circuit to correct said hue signals, a chroma saturation conversion circuit to obtain chroma saturation signals from said color difference signals, a chroma saturation correction circuit to correct said chroma saturation signals and a color temperature correction circuit to perform the color temperature correction on the respective hue and chroma saturation signals as corrected.
Description
BACKGROUND OF THE INVENTION [0001] The present invention relates to a method for correcting the color temperature of the picture signals and a picture display device of such as a color television receiver and a liquid crystal projector. [0002] In such display devices as mentioned above, it is generally known that an especially bright white color is rendered bluish to some extent for display thereon by increasing the color temperature thereof so as to make the pictures visually impressive and beautiful. [0003] It is disclosed in the Japanese Unexamined Patent Publication 23414 / 1995 that portions in such achromatic colors as white and gray are detected based on the maximum values of three types of color difference signals R-Y, G-Y and B-Y in order to enhance the level of the B-Y so as to strengthen the blue component of such portions and increase the color temperature thereof. SUMMARY OF THE INVENTION [0004] However, the actual pictures include besides a pure white color a color appro...
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
Login to View More Patent Type & Authority Applications(United States)
IPC IPC(8): H04N9/64G09G5/02H04N9/68H04N9/73
CPCG09G5/02H04N9/73G09G2320/0666
Inventor KIMURA, KATSUNOBUMATONO, TAKAAKITAKATA, HARUKISAKAI, TAKESHIKATO, WATARU
Owner HITACHI LTD