JPH08202313A - Multi-video system - Google Patents

Abstract

PURPOSE: To dissolve unevenness of luminance of display screens by executing luminance adjustments every PDP panel based on APC data. CONSTITUTION: This device is constituted of PDP panels 1 to n being single bodies of constituting elements, a system control part 2 giving an instruction whether performing the magnifying of a video or not to respective panels 1 to n and also supplying luminance adjustment data to respective panels, an A/D converting part 3, a magnifying processing part 4 executing the magnifying signal processing of a video signal, a luminance adjusting part 5 adjusting the luminance level of the video signal, the panel driving part 6 of PDP panels 1 to n, a display part 7 displaying pictures of PDP panels 1 to n, an APC(an automatic power control) part 8, for cxample integrating current consumptions equivalent to one field and reducing current consumptions to 80% of consumptions in the case the integrated value exceeds a prescribed (maximum) value and outputting data indicating the ration of the reduction to the panel driving part 6 and a panel control part 9 performing such a control as making the magnifying processing part 4 an operation state or a non-operation state by receiving an instruction from the system 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-image system having a large screen display configuration in which a plurality of PDP (plasma display) panels are arranged in a matrix.

[0002]

2. Description of the Related Art Conventionally, a PDP panel is used as a single unit for displaying images, and as a multi-imaging system in which a plurality of PDP panels are installed adjacent to each other in the vertical and horizontal directions, a multi-screen display device displaying various images on the plurality of screens. We are using. Further, in the method of using the multi-image system, it is possible to display a partial image on each PDP panel and effectively perform an enlarged display as a whole, so that it is thin and has high brightness in a conference room, an event venue or a showroom. Used for large screen displays.

FIG. 4 shows a block diagram of an embodiment of a conventional multi-video system. Reference numeral 1 denotes a PDP panel as a constituent element, which displays an image by, for example, enlarging. Reference numeral 2 denotes a system control unit that gives an instruction to each panel whether or not to perform enlargement processing. Reference numeral 3 denotes an AD conversion unit that converts the input video signal into digital data. An enlargement processing unit 4 performs enlargement signal processing on a video signal based on digital data. Reference numeral 6 denotes a panel driving unit that supplies a display current corresponding to the video signal supplied from the enlargement processing unit 4 to a corresponding electrode of the PDP panel. A display unit 7 displays an image on the PDP panel. Reference numeral 8 denotes an APC that integrates the current consumption for one field, for example, with respect to the panel drive unit 6, and limits the current consumption to 80% or the like when the integrated value exceeds a predetermined (for example, maximum) value. (Auto power control) part. A panel control unit 9 receives an instruction from the system control unit 2 and controls the enlargement processing unit 4 to be in an operating state or a non-operating state.

In the above conventional multi-video system,
The video signal supplied to each PDP panel 1 is converted into digital data by the AD conversion unit 3, and, for example, the enlargement processing unit 4
The image is displayed on the display unit 7 via the panel drive unit 6 by the enlargement process, and the whole multi-image system is displayed, for example, as shown in FIG.
As shown in, enlarge each panel P1, P2, ... P9. Alternatively, when different video signals are supplied to each PDP panel 1 and the enlargement processing is not performed, multi-screen display is performed as shown in FIG. By the way, APC for each PDP panel 1
When the current consumed by the panel according to the input video signal is, for example, a value obtained by integrating the consumed currents of one field exceeds the maximum value, the unit 8 controls the video signal of the next field and thereafter. Is multiplied by a predetermined coefficient, for example, a coefficient [0.8], to operate to reduce the current consumption. In some cases, the same video image may be displayed in multiple screens.

As a result of the operation of the APC section 8, as shown in FIG. 5 or FIG. 6, when the video signal (image) having a high average brightness which exceeds or exceeds the maximum current consumption of the PDP panel 1 continues for a predetermined time. , The panel 1 (P1) and the panel 3 (P3) in the enlarged display example of FIG. 5, and the panel panel 3 (P3) in the multi-screen display example of FIG. The average brightness level of is reduced and the display screen becomes darker. As a result, in the panel 1 (P1), the panel 3 (P3), and the like, for example, the background portion becomes darker than the background of the other panels. Therefore, in general, the brightness level is different for each panel, and there is a problem that so-called unnatural brightness unevenness occurs.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a plurality of panel configurations, the common image portion of each panel, for example, the background portion is displayed with substantially the same brightness. It is an object of the present invention to provide a multi-video system capable of displaying images while preventing so-called uneven brightness.

[0007]

In order to achieve the above object, an AD converter for converting a supplied video signal into digital data, and an enlargement process for producing an enlarged video signal of a part of an image based on the digital data. Section, a panel drive section that generates a panel drive signal from a video signal and supplies it to the display section, a display section of a PDP panel, and a signal current that the panel drive section supplies to the display section, and the same integration is performed. A plurality of PDs including an APC unit that limits the current so that the value does not exceed a predetermined current value and a panel control unit that controls each unit.
In a multi-video system including a P panel and a system control unit for controlling the PDP panel,
A brightness adjusting unit for adjusting the level of the video signal is provided for each DP panel.

Further, an AD conversion section for converting the supplied video signal into digital data, an enlargement processing section for producing an enlarged video signal of a part of an image based on the digital data, and a panel driving signal from the video signal. The panel drive unit that generates and supplies the display unit, the display unit of the PDP panel, and the signal current that the panel drive unit supplies to the display unit are integrated so that the integrated value does not exceed a predetermined current value. In a multi-video system including a plurality of PDP panels each including an APC section for limiting and a panel control section for controlling each section, and a system control section for controlling the PDP panel, a video signal for each PDP panel There is provided a brightness adjusting unit for adjusting the level and the APL calculating unit for calculating the average brightness of the video signal for each PDP panel.

[0009]

With the above-mentioned structure, for example, as shown in FIG. 5, when brightness unevenness occurs in panel 1 (P1) and panel 3 (P3), panels other than P1 and P3 are displayed. The brightness adjusting unit of each panel of P2, P4, P5, P6, P7, P8, and P9 adjusts the brightness level of each video signal, and operates, for example, to lower the brightness level.
As shown in FIG. 5, the uneven brightness generated in P1 and P3 is eliminated.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-video system according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a multi-video system according to the present invention. Reference numeral 1 is a PDP panel that is a single component, and displays an image by enlarging it, for example. Reference numeral 2 denotes a system control unit which gives each panel an instruction as to whether or not to perform enlargement processing, and supplies the brightness adjustment data for each panel. Reference numeral 3 denotes an AD conversion unit that converts the input video signal into digital data.
An enlargement processing unit 4 performs an enlargement signal process on the digital data (video signal). Reference numeral 5 is a brightness adjusting unit for adjusting the brightness level of the video signal. Reference numeral 6 denotes a panel drive unit which supplies a display current corresponding to the video signal supplied from the previous stage to a corresponding electrode of the PDP panel. A display unit 7 displays an image on the PDP panel. 8 is 80% when the current consumption for one field is integrated with the panel drive unit 6 and the integrated value exceeds a predetermined (for example, maximum) value.
It is an APC (auto power control) unit that reduces the current consumption and outputs data indicating the reduction rate. A panel control unit 9 receives an instruction from the system control unit 2 and controls the enlargement processing unit 4 to be in an operating state or a non-operating state.

The operation of the multi-video system according to the present invention will be described with reference to FIGS. 1, 2, 5 and 6. As shown in FIG. 1, the video signal supplied to each PDP panel 1 is converted into digital data by the AD conversion unit 3, and, for example,
Enlargement processing is performed by the enlargement processing unit 4, brightness adjustment is performed by the brightness adjustment unit 5 as necessary, and an image is displayed on the display unit 7 via the panel drive unit 6. In the entire multi-video system according to the present invention, for example, as shown in FIG. 5, each panel P1, P2,
.. Enlarged display on P9. Alternatively, a different video signal is supplied to each PDP panel 1, and the multi-screen display as shown in FIG. 6 is performed without performing the enlargement processing. By the way, the APC unit 8 of each PDP panel 1 has a current output from the panel driving unit 6 in accordance with an input video signal, for example, a value obtained by integrating a driving current for one field, which is equal to or exceeds the maximum value. When this is detected, a current limiting process of multiplying the driving current in the next field and subsequent fields by a predetermined coefficient, for example, 0.8 is performed, and the driving current is reduced.

At this time, the APC section 8 outputs APC data indicating the current limiting processing state to the panel control section 9. The panel control unit 9 sends the APC data to the system control unit 2 with its own identification number attached. The system control unit 2 identifies the APC data for each panel and, for example,
Based on the number of panels for which the current is limited and the size of the APC data, required brightness adjustment data is extracted from, for example, a reference table and supplied to each panel control unit 9. In the panel control unit 9, the brightness adjustment data is stored in the brightness adjustment unit 5.
Based on the brightness adjustment data, the brightness adjustment unit 5 multiplies the video signal by the brightness adjustment data (1>),
Alternatively, the video signal and the brightness adjustment data (0>) are added so that the brightness level of the video signal is lowered.

By the operation of the multi-video system according to the present invention described above, for example, as shown in FIG.
When there is unevenness in brightness where P3 becomes dark, the panels P1 and P2, P4, P5, P other than P3 are displayed.
6, P7, P8, P9 for each panel brightness adjustment unit 5,
The operation is performed so as to lower the brightness level of each video signal, and the uneven brightness is eliminated as shown in FIG.

FIG. 3 is a block diagram of another embodiment of the multi-video system according to the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. 10 is APL
(Image average level) This is the calculation unit. The APL calculation unit 1
For 0, the video signal is accumulated for, for example, two fields to calculate an average luminance level per field, and APL data corresponding to the average luminance level is created.
The panel control unit 9 sends the APC data and the APL data to the system control unit 2 with an identification number attached. The system control unit 2 corrects the APL data for each panel, for example, by the transmitted APC data, and calculates new corrected APL data. On the other hand, the system control unit 2
In advance, a reference table in which the APL data and the brightness correction data are associated with each other is prepared in advance, and the corrected APL data or the required brightness correction data for the APL data is extracted from the reference table and transmitted to a corresponding panel. .

[0015]

As described above, the present invention provides a so-called image display in which the brightness of each panel, for example, the background portion is almost the same, that is, the so-called brightness unevenness is prevented. Provide a multi-image system that can.
Therefore, when displaying various images on a plurality of PDP panel screens in multiple screens at a conference hall, an event venue, a showroom, or when enlarging a large screen in which a partial image is enlarged and displayed on each PDP panel. There is an advantage that high-quality and effective large-screen display can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a multi-video system according to the present invention.

FIG. 2 is a diagram showing an enlarged screen in which uneven brightness is eliminated in the multi-video system according to the present invention.

FIG. 3 is a block diagram of another embodiment of a multi-video system according to the present invention.

FIG. 4 is a block diagram of an embodiment of a conventional multi-video system.

FIG. 5 is a diagram showing an enlarged screen display while uneven brightness occurs in the multi-video system.

FIG. 6 is a diagram showing a multi-screen display during occurrence of uneven brightness in the multi-video system.

[Explanation of symbols]

 1 PDP panel 2 system control unit 3 AD conversion unit 4 enlargement processing unit 5 brightness adjustment unit 6 panel drive unit 7 display unit 8 APC (auto power control) unit 9 panel control unit 10 APL (image average level) calculation unit

Claims (9)

[Claims] 1. An AD conversion unit for converting a supplied video signal into digital data, and an enlargement processing unit for producing an enlarged video signal of a part of an image based on the digital data.
A panel drive unit that generates a panel drive signal from a video signal and supplies it to the display unit, a display unit of the PDP panel, and a signal current that the panel drive unit supplies to the display unit are integrated,
Provided are a plurality of PDP panels including an APC unit that limits the current so that the integrated value does not exceed a predetermined current value, a panel control unit that controls each unit, and a system control unit that controls the PDP panel. In the multi-video system, the brightness control unit receives the brightness control data generated by the system control unit based on the APC data for each PDP panel and adjusts the level of the video signal based on the brightness control data. And multi-video system. 2. The system control unit receives the current limit data supplied by the APC unit for each PDP panel, and transmits the required brightness adjustment data to the PDP panel that does not perform the current limit. The multi-video system according to claim 1. 3. The multi-video system according to claim 1, wherein the multi-video system comprises a multiplier that adjusts the level by multiplying the video signal by the brightness adjustment unit and the adjustment data. 4. The multi-video system according to claim 1, wherein the brightness adjusting unit is an adder for performing level adjustment by adding adjustment data to a video signal. 5. The multi-video system according to claim 1, wherein the level adjustment performed by the brightness adjusting unit is an adjustment for reducing the brightness of the video signal. 6. An AD conversion unit for converting the supplied video signal into digital data, and an enlargement processing unit for producing an enlarged video signal of a part of an image based on the digital data.
A panel drive unit that generates a panel drive signal from a video signal and supplies it to the display unit, a display unit of the PDP panel, and a signal current that the panel drive unit supplies to the display unit are integrated,
P consisting of an APC section that limits the current so that the same integrated value does not exceed a predetermined current value, and a panel control section that controls each section.
In a multi-video system provided with a plurality of DP panels and a system control unit for controlling the PDP panel, a brightness adjusting unit for adjusting the level of a video signal for each PDP panel and a video signal for each PDP panel A multi-video system, which is provided with an APL calculation unit for calculating the average luminance of the. 7. The multi-video system according to claim 6, wherein the APL calculation unit calculates an average luminance of video signals of a predetermined number of fields. 8. The multi-video system according to claim 6, wherein the system control section is provided with a reference table in which the average brightness data from the APL calculation section and the brightness adjustment data are stored in association with each other. 9. The system control unit is provided with a reference table in which corrected average brightness data corrected by average brightness data from the APL calculation unit and current limit data from the APC unit and brightness adjustment data are stored in association with each other. The multi-video system according to claim 6,