JP2001324971A - Multi-screen display device and its color balance control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-screen display device capable of uniformizing the color balance of plural displays while deciding objective color balance easily and its color balance control method. SOLUTION: When the color temperature data Td1 wanted to be displayed on displays are instructed from the outside, a microcomputer for control 4 calculates one of the difference between color data Tp1 and the color data Td1 or the ratio of them or the like and a PDP module 2 outputs a control signal Sc for correcting color data to be used from the color data Tp1 to the color data Td1 to a correction value generating part 5 based on the calculated result and the part 5 generates RGB correction values Sts based on the control signal Sc to output them to a multiplication part 7. Analog RGB video signals are converted into digital signals by an A/D conversion part 6 to be outputted to the multiplication part 7. The part 7 performs the multiplication among the digitized RGB video signals and the RGB correction values Sts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen display device used in an event hall or the like and a color balance control method thereof, and more particularly to a multi-screen display device capable of easily adjusting the color balance between displays. And its color balance control method.

[0002]

2. Description of the Related Art In recent years, plasma display panels (P
The production of DP) modules has increased, and the characteristics of the products have been gradually stabilized. Such a PDP module may be applied to a multi-screen display device like other display devices. However, in such a multi-screen display device, when a plurality of plasma displays are arranged for a multi-screen application, at present, variations in colors among the displays are of a degree that cannot be ignored. For this reason, the color balance between the displays is different, and the color of the portion that should be the same color is different. As a result, the image quality as one multi-screen display device cannot be said to be high.

Therefore, it is necessary to unify the color balance among the individual displays as much as possible. However, this work requires adjustment of the color balance while performing display on many displays constituting a multi-screen, and has a drawback that time and labor are easily taken.

On the other hand, there has been proposed a method of automatically adjusting color unevenness and luminance unevenness when a CRT (cathode ray tube) and an LCD (liquid crystal display) are applied to a multi-screen display (Japanese Patent Laid-Open No. 7-64522). ).

In the automatic adjustment method described in this publication, for each display constituting a multi-screen display device, a pointer is displayed in advance, a screen at that time is photographed by a camera, and the data is converted into one frame of a digital signal. The contents of the minute are stored in the frame memory,
The drive voltage of the display is feedback-controlled based on the data stored in the frame memory. As this feedback control, for example, a relationship between a video signal level and a luminance characteristic is obtained for each display, and an amplification factor of the video signal level is adjusted so that the maximum luminance of each display matches the maximum luminance of the display having the lowest maximum luminance. are doing. That is, the maximum luminance is unified.

[0006]

However, in the automatic adjustment method described in Japanese Patent Application Laid-Open No. 7-64522,
It is necessary to determine the relationship between the video signal level and the luminance characteristic for each display constituting the multi-screen, and even if it is possible to automatically adjust the luminance unevenness or the like, the adjustment is not simple. . In addition, since it is necessary to display a pointer on all the displays and take an image with a camera, the scale of the entire apparatus may be relatively large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a multi-screen display device capable of easily determining a target color balance and making the color balances of a plurality of displays uniform, and its color. It is an object to provide a balance control method.

[0008]

According to the present invention, there is provided a multi-screen display device comprising a plurality of displays arranged in a multi-screen display device. A storage device for storing first color balance data indicating the color balance in the state described above, second color balance data externally specified and indicating a common color balance among the plurality of displays, and the first color balance A color balance control unit that detects a deviation from data and matches the color balance of the input video signal with the color balance indicated by the second color balance data and outputs the video signal to the display unit. It is characterized by.

In the present invention, when the second color balance data is input from the outside, the color balance of each display is unified by the color balance control unit, so that the adjustment is extremely easy.

[0010] A multi-screen display device is provided with color balance measuring means for measuring the color balance of the display section, and the first color balance data is converted to color balance data indicating the color balance measured by the color balance measuring means. In this case, the latest color balance data can be stored in the storage device at any time even when the color balance in the specific state changes due to aging.

The storage device may be built in the display unit, and the color balance data may be data expressing, for example, a color temperature, a luminance, or a chromaticity coordinate value.

A color balance control method for a multi-screen display device according to the present invention is a multi-screen display device configured by arranging a plurality of displays. In the balance control method, first color balance data indicating a color balance in a specific state of a display unit provided in each of the displays and a second color balance externally designated and indicating a common color balance among the plurality of displays. Detecting a shift from the color balance data, and outputting the video signal to the display unit while matching the color balance of the input video signal with the color balance indicated by the second color balance data. It is characterized by having.

The method may further include a step of measuring the color balance of the display unit, and a step of rewriting the first color balance data with color balance data indicating the measured color balance.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a multi-screen display device according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. The first embodiment is a multi-screen display device in which three plasma displays are arranged vertically and horizontally, and one display is composed of a total of nine displays. Note that the number of units constituting the multi-screen display device is not limited to nine units, and for example, four units in the vertical and horizontal directions.
They may be lined up one by one. FIG. 1 is a block diagram showing the structure of one plasma display constituting a multi-screen display device according to a first embodiment of the present invention.

The plasma display 1 provided in the first embodiment is provided with a plasma display panel (PDP) module 2 composed of scanning electrodes, sustain electrodes, data electrodes, and the like. The PDP module 2 has a built-in color temperature data memory 3 that stores data corresponding to the color temperature in the standard state. The standard state is
For example, white light emission is performed on the entire screen, but the present invention is not limited to this.

For example, when the color temperature of 8000 to 11000 K is represented by 32 levels of 0 to 31, the P
The color temperature of the DP module 2 in the standard state is about 10
It is stored in the color temperature data memory 3 as a color temperature level 20 at 000K. This color temperature level is appropriately set for each of the plasma displays 1 and does not have to be the same among the nine plasma displays 1.

The plasma display 1 is provided with a control microcomputer 4 for reading the color temperature data Tp1 stored in the color temperature data memory 3. The control microcomputer 4 further reads the color temperature data Td1 indicating the color temperature to be displayed from the outside as a multi-screen display color temperature designation signal, and, for example, shifts the difference or ratio between the color temperature data Tp1 and the color temperature data Td1. And outputs a control signal Sc for correcting the color temperature as the calculation result. Further, there is provided a correction value generator 5 which generates and outputs correction data as an RGB correction value St based on the control signal Sc.

The plasma display 1 is provided with an analog / digital (A / D) converter 6 for converting an analog RGB video signal into a digital signal. Further, a multiplying unit 7 for obtaining a product of the digital output signal from the A / D converter 6 and the RGB correction value St is provided. The RGB video data as a result of the multiplication output from the multiplication unit 7 is input to the PDP module 2. In the present embodiment, the control microcomputer 4, the correction value generation unit 5,
The A / D converter 6 and the multiplier 7 constitute a color temperature controller.

Next, the operation of the first embodiment configured as described above will be described.

First, the control microcomputer 4 operates as P
The color temperature data Tp1 is read from the color temperature data memory 3 built in the DP module 2. Color temperature data Tp1
Is the color temperature level 20, for example. Then, the color temperature data Td1 desired to be externally displayed on the display.
Is specified, the control microcomputer 4 calculates a difference or a ratio between the color temperature data Tp1 and the color temperature data Td1, and based on the calculation result, converts the color temperature data to be used in the PDP module 2 into a color. A control signal Sc for correcting the color temperature data Td1 from the temperature data Tp1 is output to the correction value generation unit 5. The color temperature data Td1 for multi-display specified from the outside is, for example, a uniform color temperature of about 9000K and a color temperature level of 10, but is not limited to these. However, the color temperature and the color temperature level are common to the nine plasma displays 1.

For example, when the color temperature data Tp1 is at the color temperature level 20 and the color temperature data Td1 is at the color temperature level 10, the control signal Sc is a signal based on, for example, the color temperature level difference 10.

Next, the correction value generator 5 generates an RGB correction value St for correcting the color temperature data from the color temperature data Tp1 to the color temperature data Td1 based on the control signal Sc, and outputs the RGB correction value St to the multiplier 7.

On the other hand, the A / D converter 6 converts an analog RGB video signal input to the plasma display 1 into a digital signal, and outputs the converted digital signal to the multiplier 7.

Thereafter, the multiplying unit 7 outputs the digitized R
The multiplication of the GB video signal and the RGB correction value St is performed, and the result is output to the PDP module 2 as corrected RGB video data. The digital RGB video data that is the result of the multiplication by the multiplication unit 7 is obtained by converting the analog RGB video signal input to the A / D conversion unit 6 into color temperature data Td1 (1
0). Then, the PDP module 2 displays an image represented by the digital RGB video data as color temperature data Td1 (10).

When the color temperature data stored in the color temperature data memory 3 of the PDP module 2 is Tp2 and the color temperature data specified from the outside is Td2, the control microcomputer 4 and the correction value generation unit 5
Generates an RGB correction value St based on the difference or ratio between the RGB correction value St and the RGB correction value St.
The result of multiplication with the B video signal is PD as RGB video data.
Input to P module 2. Then, the PDP module 2 converts the image indicated by the RGB video data into the color temperature data Td.
Indicated by 2.

According to the first embodiment, in the multi-screen display device, standard color temperature data is stored in the color temperature data memory 3 of each plasma display 1 in advance, and the multi-screen display is performed. By inputting the unified color temperature data to the control microcomputer 4 of each plasma display 1, the color balance to be displayed can be set without being affected by the variation of the individual color balance of the plasma display 1. In addition, the color balance of the plurality of displays 1 can be easily approximated, and the display quality of the multi-screen display can be improved. In addition, since the display color balance can be easily adjusted in accordance with the color balance variation of the plasma display 1 by a unified operation for the entire multi-screen, a single multi-screen can be installed and displayed on all the screens. It is not necessary to adjust each time, and the adjustment work is simplified.

Next, a second embodiment of the present invention will be described. In the second embodiment, the color temperature data stored in each display can be adjusted. FIG. 2 is a block diagram showing a structure of one plasma display constituting a multi-screen display device according to a second embodiment of the present invention.

Color temperature data 3a in the second embodiment
Is a rewritable storage device, in which color temperature data corresponding to the color temperature in the standard state is stored in the initial state, as in the first embodiment. In the second embodiment,
A color temperature measuring device 8 that measures the color temperature of the PDP module 2 and outputs color temperature data is provided. The control microcomputer 4a in the second embodiment operates in the same manner as in the first embodiment and receives color temperature data output from the color temperature measuring device 8 and stores data stored in the color temperature data memory 3a. Is performed. For example, Tp is stored in the color temperature data memory 3a as color temperature data in a standard state.
When the color temperature data Tp2 is outputted from the color temperature measuring device 8 when the color temperature data 1 is stored, the color temperature data Tp1 stored so far in the color temperature data 3a is converted by the control microcomputer 4a. Rewritten to Tp2.

Next, the operation of the second embodiment configured as described above will be described.

In the second embodiment, first, similarly to the first embodiment, the control microcomputer 4a inputs the color temperature data Tp1 and controls the control signal S based on these.
c, the correction value generation unit 5 outputs an RGB correction value St, and the multiplication unit outputs digital RGB video data.
Then, the PDP module 2 converts the image into color temperature data Tp.
Displayed as 1.

Thereafter, the color temperature of the PDP module 2 is measured by the color temperature measuring device 8, and the color temperature data Tp2 is output from the color temperature measuring device 8. This color temperature data Tp2
Is input to the control microcomputer 4a as PDP color temperature data. Then, the control microcomputer 4a rewrites the color temperature data stored in the color temperature data memory 3a from Tp1 to Tp2.

As described above, the color temperature data in the standard state of each plasma display 1 is changed from Tp1 to Tp2.
Is rewritten and set. Therefore, in each plasma display 1, the color temperature data when used alone is Tp2.

Thereafter, when each plasma display 1 is used for multi-screen display, the control microcomputer 4a reads the color temperature data T from the color temperature data memory 3a.
Read p2. When the color temperature data Td1 to be displayed on the display is designated from the outside, the control microcomputer 4a transmits the color temperature data Tp2.
The color temperature data to be used in the PDP module 2 is calculated from the color temperature data Tp2 to the color temperature data Td.
The control signal Sc for correcting to 1 is output to the correction value generation unit 5.

Then, similarly to the first embodiment, the RG
The result of multiplication of the B correction value St and the digitized RGB video signal is input to the PDP module 2 as RGB video data, and the PDP module 2 displays an image represented by the RGB video data as color temperature data Td1.

According to the second embodiment, the result of measuring the color temperature while displaying the display in the standard state is used as the PDP color temperature data and the plasma display 1
To rewrite the data in the color temperature data memory 3a built in the PDP module 2 to perform more accurate correction.

Further, even if the color temperature of the PDP module 2 has changed from the data stored in the color temperature data memory 3a due to aging, P
By measuring the color temperature of the DP module 2 and rewriting the data in the color temperature data memory 3a with the current color temperature data, more accurate correction can be performed, and the color temperature is not measured from the next time. However, it is possible to correct the change including the change in the color temperature due to aging. Thus, according to the second embodiment, the plasma display 1
By appropriately updating individual color balance information, it is possible to make corrections including changes in color balance due to aging.

Next, a third embodiment will be described. The third embodiment is a modification of the second embodiment,
A color temperature data memory is provided outside the PDP module. FIG. 3 is a block diagram showing a structure of one plasma display constituting a multi-screen display device according to a third embodiment of the present invention.

In the third embodiment, a color temperature data memory 3b is provided independently of the PDP module 2. The color temperature data memory 3b is a rewritable storage device like the color temperature data 3a in the second embodiment.

In the third embodiment configured as described above, the same operation as in the second embodiment is performed. Therefore,
The same effects as in the second embodiment can be obtained.

Note that the color temperature data memory and the two external color temperature data input by the control microcomputer are directly output to the correction value generator, and the correction value generator is operated to calculate the RGB correction values St. The decision may be made.
In addition, a color temperature data memory and a look-up table (LUT) corresponding to two external color temperature data are provided, and the correction value generation unit converts the look-up table (LUT) to the RGB based on the two color temperature data. Correction value S
t may be selected. In this case, for example, when two color temperature data are both expressed in 32 levels, 32 ×
An appropriate one is selected from 32 = 1024 kinds of correction values.

Further, the A / D conversion section is arranged from the stage preceding the multiplication section to the stage following the multiplication section, and the RG output from the correction value generation section is output.
The B correction value may be a direct current (DC) voltage. in this case,
The multiplication unit performs multiplication processing using an analog signal, and analog RGB signals whose color temperature data has been corrected by the multiplication processing.
The video data is digitized by the A / D converter and output to the PDP module.

Further, in these embodiments, the processing according to the color temperature is performed to correct the color balance. However, the present invention is not limited to this, and the luminance or chromaticity coordinate values and the like are not limited to this. The color balance may be corrected using another numerical value that can express the color balance. For example, a memory for storing luminance data or chromaticity coordinate values in the standard state may be provided in the plasma display.

Furthermore, in these embodiments, the color balance is adjusted by correcting the RGB video data input to the PDP module. However, the RGB video data is input to the PDP module without correction. At the same time, control data for correction may be input to the PDP module to perform color correction inside the PDP module and emit light.

As the display, not only a PDP but also a display device such as a CRT and an LCD can be used.

[0045]

As described in detail above, according to the present invention,
If the second color balance data is designated from the outside to each display, the color balance of each display is unified by the color balance control unit, so that the adjustment is extremely easy. Also, since a camera is not always required,
The size of the entire device can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a structure of one plasma display constituting a multi-screen display device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a structure of one plasma display constituting a multi-screen display device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a structure of one plasma display constituting a multi-screen display device according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1; Plasma display 2: PDP module 3, 3a, 3b: Color temperature data memory 4, 4a; Control microcomputer 5; Correction value generator 6; A / D converter 7; Multiplier 8; , Tp2, Td1; color temperature data Sc; control signal St; RGB correction value

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (7)

[Claims] 1. A multi-screen display device comprising a plurality of displays arranged, wherein each of the displays includes a display unit and first color balance data indicating a color balance in a specific state of the display unit. A storage device for storing a color difference between the first color balance data and second color balance data externally designated and indicating a common color balance among the plurality of displays, and detecting a color of an input video signal; A multi-screen display device comprising: a color balance control unit that outputs the video signal to the display unit while making the balance match the color balance indicated by the second color balance data. 2. A color balance measuring means for measuring a color balance of the display unit, wherein the first color balance data can be rewritten to color balance data indicating the color balance measured by the color balance measuring means. 2. The multi-screen display device according to claim 1, wherein: 3. The multi-screen display device according to claim 1, wherein the storage device is built in the display unit. 4. The color balance data according to claim 1, wherein the color balance data is data representing one type of value selected from a group consisting of color temperature, luminance, and chromaticity coordinate values. 2. The multi-screen display device according to claim 1. 5. A color balance control method for a multi-screen display device for adjusting a color balance between the respective displays in a multi-screen display device configured by arranging a plurality of displays, the display provided on each of the displays. Detecting a difference between first color balance data indicating a color balance in a specific state of the unit and second color balance data externally designated and indicating a common color balance among the plurality of displays; Outputting the video signal to the display unit while making the color balance of the obtained video signal match the color balance indicated by the second color balance data. Control method. 6. A multi-screen display, comprising: a step of measuring a color balance of the display unit; and a step of rewriting the first color balance data to color balance data indicating the measured color balance. Device color balance control method. 7. The color balance data according to claim 5, wherein the color balance data is data representing one type of value selected from the group consisting of color temperature, luminance, and chromaticity coordinate values. A color balance control method for a multi-screen display device.