Video display device and color temperature correction method for the same

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.

1 . A video display apparatus, comprising: 
 a hue processor which obtains hue signals from a video signal;    a hue shifter which shifts the hue signal by a predetermined amount thereof, which is within a desired region of hue, among said hue signals; and    a display which displays the video signal, the hue signal of which is shifted by said hue shifter, wherein said hue shifter shifts a plurality of numbers of said hue signals, which are within said desired region of hue, independently from each other.    
   
   
       2 . A video display apparatus, for displaying a picture upon basis of an input video signal, comprising: 
 a signal processor which obtains signals and chroma saturation signals from said input video signal;    a hue shifter which shifts the hue signal by a predetermined amount thereof, which is within a desired region of hue, among the hue signals obtained from said signal processor; and    a display which displays the video signal, the hue signal of which is shifted by said hue shifter, wherein said hue shifter shifts a plurality of numbers of said hue signals, which are within said desired region of hue, independently from each other.    
   
   
       3 . The video display apparatus, as described in  claim 2 , further comprising: 
 a chroma saturation shifter which shifts the chroma saturation signal by a predetermined amount thereof, which is within a desired region of chroma saturation, among the chroma saturation signals obtained from said signal processor.    
   
   
       4 . The video display apparatus, as described in  claim 3 , wherein the shifting process on said hue signal and said shifting process of said chroma saturation signal are conducted, independently from each other.  
   
   
       5 . The video display apparatus, as described in  claim 3 , wherein the amounts of shifting said hue signal and said chroma saturation signal are given from a microcomputer.  
   
   
       6 . The video display apparatus, as described in  claim 5 , wherein the amount of shifting said hue signal or said chroma saturation signal is adjustable.  
   
   
       7 . The video display apparatus, as described in  claim 5 , wherein the amount of shifting said hue signal or said chroma saturation signal is settable depending upon a kind of said display.  
   
   
       8 . The video display apparatus, as described in  claim 3 , wherein said hue signal and said chroma saturation signal are digital signals, and said shifting process of said hue signal and said shifting process of said chroma saturation signal are conducted digitally.  
   
   
       9 . The video display apparatus, as described in  claim 1 , wherein to said hue shifter is given data in relation to a width of hue (W), indicating said desired region of hue, and a shift amount of hue (H), and said hue shifter shifts said hue signal within the desired region of hue with using the given data in relation to the width of hue (W) and the shift amount of hue (H).  
   
   
       10 . The video display apparatus, as described in  claim 9 , wherein the data in relation to said width of hue (W) and said shift amount of hue (H) are given by a microcomputer.  
   
   
       11 . The video display apparatus, as described in  claim 9 , wherein to said hue shifter is further given a center (HP) of said width of hue.  
   
   
       12 . The video display apparatus, as described in  claim 1 , wherein said shifting amount of hue is adjustable.