Computer graphics processing and selective visual display system – Display driving control circuitry – Intensity or color driving control
Reexamination Certificate
1999-08-17
2002-01-22
Luu, Matthew (Department: 2672)
Computer graphics processing and selective visual display system
Display driving control circuitry
Intensity or color driving control
C345S022000, C348S602000, C382S167000
Reexamination Certificate
active
06340976
ABSTRACT:
TECHNICAL FIELD
The present invention relates to color calibration of a display device and a multi-vision system comprising a plurality of display units.
BACKGROUND ARTS
FIGS. 16 and 17
from Japanese unexamined patent publication Hei7-72817 illustrate a part of the cross-sectional diagram and the block chart of an important part for the conventional multi-vision brightness control apparatus comprising the plurality of display units.
Also,
FIG. 18
is the flow chart showing an operation of the same multi-vision brightness control apparatus.
Description to the numbered components indicated in
FIGS. 16 and 17
follows: a screen R
1
; a sensor R
3
for detecting the brightness of an outer rim; a wall R
5
; a ceiling R
6
; a storage shelf R
7
; a skylight R
31
; a projection unit R
8
; a lens block R
9
of the projection unit R
8
; a control board R
10
of the projection unit R
8
; a Braun tube R
11
of the projection unit R
8
; a console panel R
12
of the projection unit R
8
; and a lead wire R
13
for transmitting signal of the sensor R
3
to the control board.
There are a plurality of screens R
1
and projection units R
8
. There is one projection unit R
8
for every one of the screens R
1
. An image from the projection unit R
8
is projected to the screen R
1
. The sensor R
3
is arranged at the outer rim of a screen frame, and the sensor R
3
detects a beam brightness being illuminated to the screen frame. Brightness information detected by the sensor R
3
is transmitted to the control board R
10
via the lead wire R
13
, and the brightness information is stored and used for calculation for setting the brightness to the Braun tube R
11
.
Following is a detailed description for the operation of the multi-vision brightness control apparatus comprising the above-mentioned configuration with reference to FIG.
18
.
First of all, the multi-vision brightness control apparatus is powered on (step
101
). Next, a content of a memory device inside a control circuit is cleared to 0 (step
102
), and when a certain time has lapsed (step
103
), a time counter t is cleared to 0 (step
104
). The sensor R
3
detects a surrounding brightness (step
105
), and the brightness information of the surrounding is input to the control board R
10
via the lead wire
13
. The control board R
10
calculates a minimum brightness values of the Braun tube R
11
(step
106
) so that it is easy to see responding to the surrounding brightness. A result of the calculation is inputted to the Braun tube, then brightness is set (step
107
), and an image is projected to the screen. If the apparatus is turned off (step
108
), a termination process is performed (step
109
), and if the apparatus is not turned off (step
108
), the process is repeated from the step of detecting the brightness. surrounding is input to the control board R
10
via the lead wire R
13
. The control board R
10
calculates a minimum brightness values of the Braun tube R
11
so that it is easy to see responding to the surrounding brightness. A result of the calculation is inputted to the Braun tube, then brightness is set, and an image is projected to the screen. If the apparatus is turned off, a termination process is performed, and if the apparatus is not turned off, the process is repeated from the step of detecting the brightness.
The multi-vision from the conventional example has performed the brightness control as described above. Since only information obtained from the sensor R
3
is the brightness information, such that a brightness setting responding to a surrounding environment only at that instance is optimally set, and a control of the display color was not possible.
Also, the sensor R
3
of the conventional multi-vision is not set for each one of the screens, therefore, even if there is a difference in the display colors between the screens, the conventional multi-vision is unable to detect the difference such that the color for every screen cannot be controlled, so the color is unevenly displayed as it is.
The present invention aims to adjust the display color of the display unit to a target color.
Also, the present invention aims to get rid of the differences in the display colors between the display units by adjusting the display colors of the plurality of display units of the multi-vision system to the same target color.
Further, the present invention aims to improve the performance of the whole color adjustment by optimally selecting a target color which is a measure to the display color adjustment for a plurality of the display units of the multi-vision system.
Furthermore, the present invention aims to perform the above-mentioned color calibration automatically eliminating too much manual operations with a simply configured unit.
DISCLOSURE OF THE INVENTION
According to one aspect of the present invention, a multi-vision system including a plurality of display units comprises the following: a sensor for performing colorimetry of display colors from the plurality of display units; a color conversion coefficient calculation unit for calculating a color conversion coefficient to calibrate a display color of each display unit by using colorimetry values obtained from the sensor by performing the colorimetry for the display colors of the plurality of display units; and a color processing unit for performing a color conversion of the display color of each display unit by using a calculated color conversion coefficient from the color conversion coefficient calculation unit.
According to another aspect of the present invention, the multi-vision system includes the following: the color processing unit which receives a signal of at least one of representing colors, and displays the representing color on the display units without a color conversion; the sensor perform colorimetry for the representing color of the plurality of display units displayed by the color processing unit; and the color conversion coefficient calculation unit calculates the color conversion coefficient of each display unit for color converting the representing color measured by the sensor to a pre-determined target color, and outputs a calculated color conversion coefficient to the color processing unit.
According to another aspect of the present invention, the multi-vision system includes the sensor which is positioned inside the multi-vision system and in between non-display area of the plurality of display units.
According to another aspect of the present invention, the multi-vision system includes the sensor which is positioned outside of the multi-vision system.
According to another aspect of the present invention, the multi-vision system includes the sensor which is placed to be able to scan in parallel against the plurality of display units.
According to another aspect of the present invention, the multi-vision system includes the color conversion coefficient calculation unit which decides a signal value of at least one of the representing colors, and takes a colorimetry value that has a maximum common color reproduction region in a color reproduction region of the plurality of display units as the target color of the representing color from within the colorimetry values of the representing color when displaying the representing color to the plurality of display units without a color conversion.
According to another aspect of the present invention, the multi-vision system includes the color conversion coefficient calculation unit which displays the colorimetry value of at least one of the representing colors of the plurality of display units on a chromaticity coordinate, and decides the target color based on a specified chromaticity coordinate.
According to another aspect of the present invention, the multi-vision system includes the color conversion coefficient calculation unit which decides a signal value of at least one of the representing colors, and takes a colorimetry value that has a smallest chroma as the target color of the representing color from within the colorimetry values of the representing color when displaying the representin
Miyata Kimiyoshi
Oguchi Mariko
Saito Masayuki
Luu Matthew
Mitsubishi Denki & Kabushiki Kaisha
Sajous Wesner
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