JPH0772817A - Luminance controller of multivision - Google Patents

Abstract

PURPOSE:To make videos easily visible in a place where ambient luminance varies by providing the front surface of a screen with sensors to detect and store the luminance and setting the luminance so as to attain the min. value of the luminance of the videos of a cathode ray tube to make the videos easily visible with respect to the detected external luminance. CONSTITUTION:The ambient luminance is detected by the sensors 3 and the ambient luminance information is inputted by lead wires to a control circuit board 10. This control circuit board 10 executes the calculation arranged in such a manner that the numerical value of the luminance of the cathode ray tube attains the min. luminance to make the videos easily visible according to the ambient luminance by the ambient luminance information. The result thereof is inputted to the cathode ray tube 11. The videos are projected on the screen of the cathode ray tube 11. Stop processing is executed if there is the stop of the device. The luminance of the cathode ray tube 12 and the calculation system are operated by a manual operation from an operation board 12. As a result, the luminance of the cathode ray tube is controlled to the easily visible luminance according to the luminance of the place of installation. The bright videos are thus obtd. and the life thereof is prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brightness control device for changing the brightness of an image according to the brightness of a multivision installation place.

[0002]

2. Description of the Related Art In conventional multivision, one method is to make the whole image clearly visible by using a core unit located below the core unit which is a constituent unit of a large screen. The core unit located in the upper stage is installed with a slight inclination so that the main luminous flux of each projection unit provided inside the core unit of each stage intersects at a constant distance from the front of the screen, and at this constant distance, with the naked eye. In some cases, the brightness of the image projected on the screens of the core units located above and below when viewed is constant.

As an example of this kind of apparatus, Japanese Patent Publication No. 1-22
The multi-projection television described in Japanese Patent No. 8281 may be used.

[0004]

In the above-mentioned publicly known example, the installation place is less likely to be affected by external sunlight such as an indoor plaza or a conference room, and when the brightness is constant, the images of the core units are There was a feature that the brightness was constant and the image was easy to see.

However, there is a problem that an image in a place where the brightness of the surroundings of the installation of the multivision is remarkably increased due to the time when the sun rays enter directly from the skylight in an airport lobby or the like, becomes white and becomes unclear.

Further, if the brightness of the image is constantly raised and the definition of the image by the external light is increased, there is a problem that the life of the cathode ray tube for projecting the image is shortened.

The present invention has been made in view of the problems of the above-mentioned known examples, and an object thereof is to make it easy to always see an image in a place where the surrounding brightness where sun rays and the like exist and which fluctuates with time, It is to provide a brightness control device for multi-vision, which also considers the life of the CRT.

[0008]

For the purpose of solving the problems of the above-mentioned known examples, a sensor is provided on the front surface of the screen to detect and store the brightness, and the minimum value of the brightness of the image of the cathode ray tube makes it easier to see the image with respect to the external brightness. The control unit is provided so as to set the brightness of the CRT.

[0009]

[Function] Since the brightness of the image can be controlled according to the brightness of the installation location, a clear image can always be provided, and the brightness of the installation location is mainly due to the sun's rays, so the brightness of the image may rise or fall extremely depending on the time. Since it can be raised or lowered accordingly, it is rarely used with the brightness of the cathode ray tube constantly raised, so the life of the cathode ray tube can be greatly extended.

[0010]

The details of one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an appearance including a partial sectional view of a multi-vision according to an embodiment of the present invention, and FIGS. 2 and 3 are schematic sectional views taken along line AA of FIG. 4 shows a block diagram of a main part of a multi-vision brightness control apparatus according to an embodiment of the present invention, and FIG. 5 shows a flowchart of the operation of the apparatus shown in FIG.

In each of the drawings, 1 denotes a screen, 2 denotes a screen frame for locking the screen 1, 3
Indicates a sensor that detects the brightness of the outer circumference, and 4 indicates an outer frame that locks the outer circumference of the screen 1 and the screen frame,
Reference numeral 5 is a wall, 6 is a ceiling, and 7 is a storage rack for accommodating the projection unit 8.

Further, 9 is a lens block of the projection unit 8, 10 is a control board of the projection unit 8, 11 is a cathode ray tube of the projection unit 8, 12 is an operation panel of the projection unit 8,
13 is a lead wire for transmitting the signal of the sensor to the control board,
Reference numeral 21 denotes a frame that supports the storage frame 7, the screen frame 2, and the outer frame 4.

Reference numeral 15 is DY of the cathode ray tube 11, 17 is an expanding distributor, 18 is an interface, 19 is an image input, 31 is a skylight, and 101 to 111 are shown in FIG.
Each step of the flowchart shown in FIG.

In each figure, the screen 1 is composed of a plurality of sheets, the outer periphery of which is locked by the respective screen frames 2, and each of the screen frames 2 is locked by the outer frame 4 in its entire outer shape.
The outer frame 4 is fixedly locked to the wall 5, and as a result, the plurality of screens 1 are fixed to the wall 5.

The projection unit 8 corresponds to the screen 1 in a ratio of 1: 1 and its image is projected on the screen 2 from the back side and stored in the storage rack 7, and the storage rack 7 and a part of the screen frame 2 are supported by the base 21. The sensor 3 may be arranged on the outer periphery of the screen 2, and the sensor 3 may be arranged in the space of the wall 5 or the screen 2 and the projection unit 8 to detect the brightness of the light beam irradiated on the screen 2. It will be good if possible.

The projection unit 8 includes a lens block 9, a control board 10, a cathode ray tube 11, an operation panel 12, and a DY 15.
The cathode ray tube 11 projects an image from the back surface onto the screen 2 through the lens block 9 under the control of DY and the control board 10, and the performance of the cathode ray tube 11 is adjusted by operating the operation panel 12. The image source is input from the image input device 19 via the interface 18 to the control panel 10 of each projection unit 8 by the enlargement distributor 17, and is projected from the cathode ray tube 11 as described above.

The brightness information detected by the sensor 3, which is an essential part of the present invention, is controlled by the lead wire 13 in the control board 10.
The brightness of the cathode ray tube 11 is set and stored and calculated.

The operation of the brightness control device for multi-vision having the above configuration will be described below with reference to the flowchart of FIG.

First, the multivision is powered on and activated. (Step 101) Next, the contents of each memory device in the control circuit are cleared to zero (Step 102),
After a certain period of time (step 103), the time counter is cleared to zero (step 104), the ambient brightness is detected by the sensor 3 (step 105), and the ambient brightness information is input to the control board 10 by the lead wire 13, and the control board Reference numeral 10 is an arithmetic operation designed so that the numerical value of the luminance of the cathode ray tube 11 becomes the minimum luminance that makes it easier to see according to the ambient luminance based on the ambient luminance information (step 106) and inputs it to the cathode ray tube (step 107) to display the image on the screen If there is a stop of the device (step 108), stop processing is performed (step 109). If this loop is not closed, the process returns to the terminal symbol and this loop is closed.

The brightness and calculation method of the cathode ray tube 11 can be manually operated from the operation panel 12.
(Step 110, Step 111)

[0022]

As described above, according to the present invention, the brightness of the cathode ray tube is controlled to a brightness that is easy to see in accordance with the brightness of the installation location, so that a clear image can always be seen, and the cathode ray tube is always strong and constant. Compared with the method of projecting a clear image with brightness, it has the effect of extending the life significantly.

[Brief description of drawings]

FIG. 1 is an external perspective view of an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 4 is a block diagram of a brightness control device for multi-vision according to an embodiment of the present invention.

5 is a flow chart of the operation of the apparatus of FIG.

[Explanation of symbols]

1 ... Screen, 2 ... Screen frame, 3 ... Sensor, 4
... outer frame, 8 ... projection unit, 9 ... lens block, 10
... control board, 12 ... operation panel, 13 ... lead wire, 15 ... D
Y, 31 ... Skylight.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 5/68 C

Claims (3)

[Claims] 1. A multi-screen comprising at least a set of a screen, a screen frame for supporting the screen, and a projection unit for projecting projection light on the screen, combined vertically and horizontally to form a large screen. In the vision, a detector for detecting the brightness or illuminance near the screen is provided outside the screen or in the space between the screen and the projection unit itself, or from the screen, and the brightness of the cathode ray tube provided in the projection unit from the detector. The brightness or illuminance detected by the detector is reported to a control unit that controls, and the brightness or illuminance is converted into a value obtained by performing a specific calculation, and the brightness of the cathode-ray tube is controlled. A multi-vision brightness control device characterized by the above. 2. The arithmetic method of the arithmetic unit of the control unit according to claim 1, wherein the luminance of an image projected from a cathode ray tube is converted into a minimum value which makes the luminance of an external luminance or an illuminance value clear. Characteristic multi-vision brightness control device. 3. The brightness control of multi-vision according to claim 1, wherein the brightness or illuminance by the detector is reported to the control unit at a certain fixed time interval to control the brightness of the cathode ray tube. apparatus.