JPH11305717A - Multi-screen display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-screen display system which eliminates variation in luminance between screens even when video signals different in mean luminance of display device are inputted. SOLUTION: The display device A to D are each provided with a video amplifier 1 which amplifies a video signal, an A/D conversion part 2 which converts the video signal into a digital signal, a PDP(plasma display panel) 3 which receives the digital video signal and displays video, a power consumption detection part 4 which detects the power consumption of the PDP3, a control part 5 which controls the gain of the video amplifier 1 according to its detection signal, a gain detection part 6 which detects the quantity of gain variation of the video amplifier 1 and outputs gain data, a transmitting means 7 which sends the gain data to the respective devices A to D and also receives gain data from the display devices A to D, and a gain calculating means 8 which determines the gain of its video amplifier according to the received gain data of the respective display devices A to D, and control is carried out so as to eliminate variation in luminance among the display device A to D.

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 system in which a plurality of display devices using a PDP are arranged. About what you did.

[0002]

2. Description of the Related Art In a multi-screen display system in which a plurality of display devices using a PDP are arranged to form a large screen, conventionally, as shown in FIG. 4, each of the display devices A to D is inputted. A video amplifier 1 for amplifying a video signal, an A / D converter 2 for converting a video signal from the video amplifier 1 into a digital signal, and a digital video signal of the A / D converter 2 for inputting and displaying a video. (PDP) 3, a power consumption detection unit 4 for detecting power consumption of the PDP 3, and a control unit 5 for controlling a gain of the video amplifier based on a detection signal from the power consumption detection unit 4. 'And each display device A as shown in FIG.
To D display a part of the screen (Va, Vb, Vc or Vd). However, in this configuration, for example, as shown in FIG. 2A, when the luminance of the screen displayed on the display device B is high as a whole, the power consumption of the display device B detected by the power consumption detection unit 4 in the PDP is reduced. Since the power increases, the control unit 5 ′ controls the gain of the video amplifier 1 so that the power consumption becomes equal to or less than a certain value. For this reason,
As shown in FIG. 2B, the brightness between the screens changes, such as the brightness of the display devices A, C, and D being high and the brightness of the display device B being low. There was a problem of stripping.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and eliminates a change in luminance between screens even when video signals having different average luminances of the respective display devices are input, so that the screen can be easily viewed. It is an object of the present invention to provide a multi-screen display system.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a multi-screen display system comprising a plurality of display devices arranged to form a large screen. And an A / A for converting the video signal from the video amplifier into a digital signal
A D conversion unit, a PDP (Plasma Display Panel) that inputs a digital video signal of the A / D conversion unit and displays an image, a power consumption detection unit that detects power consumption of the PDP (Plasma Display Panel), A control unit that controls a gain of the video amplifier based on a detection signal from the power consumption detection unit; a gain detection unit that detects a gain change amount of the video amplifier and outputs gain data; Transmitting the gain data to each display device, transmitting means for receiving the gain data from each display device, from the received gain data of each display device, a gain calculation means for determining the gain of its own video amplifier, To provide a multi-screen display system in which a change in luminance between the display devices is eliminated.

A control unit for storing a default value of a gain of the video amplifier; a gain control amount determining unit for determining a gain control amount based on a detection signal from the power consumption detecting unit; And a gain control unit that controls the gain of the video amplifier based on the gain control amount determined by the gain control amount determination unit.

The gain detecting section calculates a gain change amount based on a gain default value stored in the default value storage section and a gain control amount determined by the gain control amount determining section. And a first gain storage unit for storing the same gain change amount.

A gain calculating means for storing gain data received from each display device;
A set gain determining unit that compares gain data stored in the second gain storage unit and determines a set gain change amount of the entire display device, and a gain change amount stored in the first gain storage unit. The multi-screen display system includes a gain comparison unit that determines a gain control amount of the video amplifier of the own device by comparing the set gain change amount determined by the set gain determination unit.

[0008] The power consumption detecting section detects a sustain current of the PDP to provide a multi-screen display system.

The power consumption detecting section detects a sum of a sustain current and an address current of the PDP to provide a multi-screen display system.

The power consumption detecting section detects a current consumption of the whole PDP to provide a multi-screen display system.

[0011]

As described above, in the multi-screen display system according to the present invention, the display device includes a video amplifier for amplifying an input video signal, and a video signal from the video amplifier being converted into a digital signal. A / D converter that performs
PDP (Plasma Display Panel) that inputs digital video signal of / D converter and displays video, and PDP
(Plasma display panel) a power consumption detection unit for detecting power consumption, a control unit for controlling the gain of the video amplifier based on a detection signal from the power consumption detection unit, and a gain change amount of the video amplifier. A gain detection unit that detects and outputs gain data, a transmission unit that transmits the gain data from the gain detection unit to each display device, and receives the gain data from each display device, and a display device that receives the gain data. Is provided with a gain calculation means for determining the gain of the own video amplifier from the gain data of (1), so that it is possible to perform control so as to eliminate a change in luminance between the respective display devices.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a multi-screen display system according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a multi-screen display system according to the present invention. In the figure, A to D are display devices constituting a multi-screen display system. Reference numeral 1 denotes a video amplifier which amplifies an input video signal (R, G, B) to a predetermined level. Reference numeral 2 denotes an A / D converter, which converts a video signal of a predetermined level output from the video amplifier 1 into a digital signal. Reference numeral 3 denotes a PDP (plasma display panel) which adjusts the color of the digital video signal from the A / D converter 2 and displays the adjusted digital video signal. Reference numeral 4 denotes a power consumption detection unit that detects the power consumption of the PDP. This power consumption detection unit 4
The sustain current of the DP is detected, the sustain current and the address current are detected, or the entire current consumption is detected. Reference numeral 5 denotes a control unit, a default value storage unit 51 that stores a factory gain of the video amplifier 1, and a gain control amount determination unit that determines a gain control amount based on a detection signal from the power consumption detection unit 4. It comprises a unit 52 and a gain control unit 53 that controls the increase or decrease of the gain of the video amplifier 1 based on the gain control amount determined by the gain control amount determination unit 52. Reference numeral 6 denotes a gain detection unit, which stores a gain default value stored in the default value storage unit 51 and the gain control amount determination unit 52.
And a first gain storage unit 62 that stores the gain change amount as gain data based on the gain change amount determined in step (1). Reference numeral 7 denotes, for example, a transmission unit connected by a LAN, which reads out the gain data from the first gain storage unit 62 of the gain detection unit 6 and transmits it to each display device, and receives the gain data from each display device. ing. 8
Is a gain calculating means for determining the gain of the video amplifier 1 based on the gain data of each display device received by the transmission means 7, a second gain storage section 81 for storing the gain data received from each display device, Second gain storage unit 81
A setting gain determination unit 82 that compares the gain data stored in
A gain comparison unit 83 that compares the gain change amount stored in the first gain storage unit 62 with the set gain change amount determined by the set gain determination unit 82 to determine the gain control amount of the video amplifier 1 of the own device. It consists of: A plurality of these display devices A to D are arranged adjacent to each other as shown in FIG.
A large screen is formed.

The operation of the above configuration will now be described. FIG. 3 is an explanatory diagram showing a change in power consumption of the PDP depending on a video signal level input to the PDP. Now
Consider a case where the image shown in FIG. 2A is displayed on the PDP 3 of each of the display devices A to D. P of display devices A, C, D
As shown in FIG. 3, SVa, SVc, and SVd having relatively low average signal levels are input to DP3, and the video signal SVb having high average signal level is input to the display device B. In this case, since the power consumption of the PDP 3 detected by the power consumption detection unit 4 of the display devices A, C, and D does not exceed the fixed value Ps,
The gain control amount determination unit 52 determines that the gain change amount is zero, and fixes the gain to the gain Gd of the default value storage unit 51. In addition, since the power consumption of the PDP 3 detected by the power consumption detection unit 4 of the display device B becomes Pb exceeding the constant value Ps, the gain control amount determination unit 52 determines that the power consumption is the constant value Ps
The gain change amount is determined to be −ΔGb, and the gain control unit 53 changes the gain of the video amplifier by −ΔGb to G1 lower than the gain Gd of the default value storage unit 51. In this state, as shown in FIG. 2- (B), each screen displays the brightness of the display device B on the other display devices A, C, and D.
Brightness.

Next, in the display devices A, C and D,
The gain change amount detection unit 61 detects zero change amount,
Is stored as gain data in the gain storage unit 62. Further, in the display device B, the gain change amount detection unit 61 detects the change amount -ΔGb, and stores it as gain data in the first gain storage unit. Next, the transmission unit 7 transmits the gain data stored in the first gain storage unit 62 to each display device.

Each display device receives these gain data and stores them in the second gain storage section 81. The setting gain determination unit averages the gain data having a change amount from all the gain data stored in the second gain storage unit 81 to determine the setting gain data (= −ΔGb). Next, each gain comparison unit 83 compares the gain data with the gain data of the own device, and uses the difference as the gain control amount of the video amplifier 1 of the own device. For example, in the case of the display device A, the gain data of the own device (= 0) and the set gain data (= −Δ
Gb) (−ΔGb−0 = −ΔGb) is defined as the gain control amount of the video amplifier 1 of the own device, and the gain of the video amplifier 1 is reduced from the current G0 by ΔGb to G1 via the gain control unit 53. . In the case of the display device B, the gain data of the own device (= −ΔGb) and the set gain data (=
−ΔGb), the difference (−ΔGb−−Δ
Gb = 0) is set as the gain control amount of the video amplifier 1 of the own device, and the gain of the video amplifier 1 is kept as it is G1. When this state is reached, there is no difference in luminance between the screens as shown in FIG.

[0016]

As described above, according to the multi-screen display system of the present invention, the display device converts the video signal from the video amplifier into a digital signal by amplifying the input video signal. A / D conversion unit, a PDP (Plasma Display Panel) for inputting a digital video signal of the A / D conversion unit and displaying an image,
A power consumption detecting unit for detecting power consumption of P (plasma display panel), a control unit for controlling a gain of the video amplifier based on a detection signal from the power consumption detecting unit, and a gain change amount of the video amplifier A gain detecting unit for detecting gain and outputting gain data, transmitting means for transmitting the gain data from the gain detecting unit to each display device, and receiving gain data from each display device; Since gain calculation means for determining the gain of the video amplifier based on the gain data of the device is provided, it is possible to perform control so as to eliminate a change in luminance between the respective display devices.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a multi-screen display system according to the present invention.

FIG. 2 is an explanatory diagram illustrating screen control of a multi-screen display system according to the present invention.

FIG. 3 is an explanatory diagram illustrating the operation of the multi-screen display system according to the present invention.

FIG. 4 is a block diagram showing a conventional multi-screen display system.

[Explanation of symbols]

 A to D display device 1 video amplifier 2 A / D conversion unit 3 PDP (plasma display panel) 4 power consumption detection unit 5 control unit 51 default value storage unit 52 gain control amount determination unit 53 gain control unit 6 gain detection unit 61 gain Change amount detection unit 62 First gain storage unit 7 Transmission unit 8 Gain calculation unit 81 Second gain storage unit 82 Set gain determination unit 83 Gain comparison unit

Claims (7)

[Claims] In a multi-screen display system in which a plurality of display devices are arranged to form a large screen, the display device includes a video amplifier for amplifying an input video signal and a video signal from the video amplifier. A / to convert to digital signal
A D conversion unit, a PDP (Plasma Display Panel) that inputs a digital video signal of the A / D conversion unit and displays an image, a power consumption detection unit that detects power consumption of the PDP (Plasma Display Panel), A control unit that controls a gain of the video amplifier based on a detection signal from the power consumption detection unit; a gain detection unit that detects a gain change amount of the video amplifier and outputs gain data; Transmitting the gain data to each display device, transmitting means for receiving the gain data from each display device, from the received gain data of each display device, a gain calculation means for determining the gain of its own video amplifier, Wherein a change in luminance between the display devices is eliminated. 2. A control unit, comprising: a default value storage unit that stores a default value of a gain of the video amplifier; and a gain control amount determination unit that determines a gain control amount based on a detection signal from the power consumption detection unit. 2. The multi-screen display system according to claim 1, wherein the multi-screen display system comprises a unit and a gain control unit that controls an increase or decrease of the gain of the video amplifier based on the gain control amount determined by the gain control amount determination unit. 3. A gain change amount, wherein the gain detection unit calculates a gain change amount based on a gain default value stored in the default value storage unit and a gain control amount determined by the gain control amount determination unit. 3. The multi-screen display system according to claim 2, comprising a detection unit and a first gain storage unit for storing the same gain change amount. 4. The display device according to claim 1, wherein the gain calculating means compares a gain data stored in the second gain storage unit with gain data stored in each of the gain devices received from each display device. A setting gain determining unit for determining the overall setting gain change amount, and comparing the gain change amount stored in the first gain storage unit with the setting gain change amount determined by the setting gain determining unit to compare the image of the own apparatus. 4. The multi-screen display system according to claim 3, comprising a gain comparison unit that determines a gain control amount of the amplifier. 5. The multi-screen display system according to claim 1, wherein said power consumption detecting section detects a sustain current of a PDP. 6. The multi-screen display system according to claim 1, wherein the power consumption detecting section detects a sum of a sustain current and an address current of the PDP. 7. The multi-screen display system according to claim 1, wherein the power consumption detection unit detects current consumption of the entire PDP.