JPH04359641A - Image display device - Google Patents

Abstract

PURPOSE:To increase a life of a display unit and to reduce power consumption of an image display device by controlling a power source of the unit. CONSTITUTION:A power source controller 6 for controlling a power source of a display unit 5 in response to a control command of a CPU 3, is provided. When it receives screen information from a host system or a signal from an input unit 1, the CPU 3 controls the controller 6 to supply power to the unit 5, and not to supply the power to the unit 5 after a display time is elapsed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device capable of receiving screen information via communication, and more particularly to power supply control thereof.

0002

2. Description of the Related Art FIG. 3 is a block diagram showing a conventional image display device, which was shown, for example, at the 14th Automatic Meter Reading Seminar ``Introduction, popularization and multipurpose technology for automatic meter reading systems'' (TATEC). In the figure, 1 is an input device that performs an image search through the user through a switch operation, and 2 is a communication control unit that transmits screen search number data from the user to the upper system or receives screen information from the upper system. , 3 is a central processing unit (CPU) as a screen decoding unit that processes input data from the input device 1 or decodes screen information from the communication control unit 2, and 4 stores programs and screen information. 5 is a display device that displays screen display data from the CPU 3. FIG. 4 is a diagram showing an example of the format of screen information sent from the upper system to the communication control unit 2, Start of Text) is a code that represents the start of data, control code represents screen information data, and ETX (End of Text) is a code that represents the beginning of data.
is a code indicating the end of data, and Bcc is a pathoti code.

Next, the operation will be explained. The display device 5 itself has a menu screen, and always displays this screen. The display device 5 is connected to the communication control unit 2 and C from the upper system.
When screen display data is sent through the PU 3 or when screen display data for a screen search is received through a screen search by operating a switch from the input device 1, the screen display contents change. At this time, the CPU 3 decodes the screen information received from the communication control unit 2, accumulates and stores the decoded data in the memory 4, reads it from the memory 4, and sends it to the display device 5 as screen display data for display.

0004

[Problems to be Solved by the Invention] Conventional image display devices are configured as described above, and because they constantly display a menu screen, there are problems such as shortening the lifespan of the display device and increasing power consumption. there were.

The present invention was made to solve the above-mentioned problems, and aims to provide an image display device that can extend the life of the display device and reduce power consumption. do.

[0006]

[Means for Solving the Problems] An image display device according to the present invention includes a screen decoding section that converts screen information data in screen information sent from a higher-level system into screen display data;
A display device that displays the screen display data, and a power source that controls power on and off of the display device in response to a signal from the input device or a control command signal generated by the screen decoding unit in accordance with the screen information. It is equipped with a control section.

[0007]

According to the present invention, when receiving screen information from a host system or a signal from an input device, the power control section is driven by a command from the screen decoding section to turn on the power of the display device. When the display device is already powered on, the screen decoding section does not perform on control.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, numerals 1 to 5 are the same as the conventional device. Reference numeral 6 denotes a power supply control unit composed of, for example, a relay, which performs on/off control for supplying power to the display device 5, and a contact point 6 connected between the display device 5 and the power terminal +V.
This contact 6a is turned on and off in response to a control command signal from the CPU 3.

Next, the operation will be explained with reference to the flowchart shown in FIG. First, when screen information in the format shown in Figure 4 is sent from the upper system,
This screen information is converted from serial data into parallel data by the communication control unit 2 and stored in the memory 4 via the CPU 3. At this time, when the CPU 3 detects a specific code such as "STX" code in the received screen information in step 11, the CPU 3 detects a specific code such as "STX" code in the received screen information.
It is determined whether the power of the display device 5 is on, and if the power of the display device 5 is off, in step 13, an on control command signal is generated to the power supply control unit 6, and the contact 6a is turned on. Power is applied to the display device 5. Then CPU3
In step 14, the screen information stored in the memory 4 is read out, the screen information data therein is converted into screen display data, and in step 15, this screen display data is supplied to the display device 5 for display. . In step 12, if the display device 5 is powered on, C
The PU 3 does not generate an ON control command signal, but converts the screen information data in the received screen information into screen display data in step 14 as described above, and supplies this screen display data to the display device 5 in step 15. Display.

[0010] Furthermore, power on/off control of the display device 5 can also be performed by key input from the input device 1. That is, when the screen search number signal is supplied from the input device 1, the CPU 3 determines whether or not the display device 5 is powered on, and if the display device 5 is powered off, it issues an on control command signal. The power is generated in the power control section 6, and the contact 6a is turned on to supply power to the display device 5, and after a menu screen is displayed, screen display data related to the screen search is displayed. If the display device 5 is powered on, the CPU 3 does not generate an on control command signal to the power supply control unit 6 . On the other hand, the communication control unit 2 receives screen information from the upper system within a certain period of time.
is not received or there is no key input from input device 1,
The CPU 3 outputs an off control command signal to the power supply control unit 6,
The contact 6a is turned off to stop supplying power to the display device 5. This controls the unnecessary supply of power to the display device 5, thereby extending its life and reducing the power consumption of the entire device.

Example 2. In the above embodiment, when turning on the power of the display device 5 through communication, the “STX” code in the communication message, that is, the screen information is detected and the supply of power to the display device 5 is started. The present invention is not limited to , and other specific codes may be used to achieve the same effect. In addition, in the method of supplying power to the display device 5 by receiving a power-on command in an independent message before receiving the image data message, that is, in the screen information format shown in FIG. 4, the first control code includes: It is also possible to enter dedicated power-on command data instead of the screen information data, enter the screen information data in the second and subsequent control codes, and supply power to the display device 5 when the dedicated power-on command data is received. , has the same effect.

0012

As described above, according to the present invention, there is provided a screen decoding unit that converts screen information data in screen information sent from a higher-level system into screen display data, and a display that displays the screen display data. and a power control unit that controls power on and off of the display device in response to a control command signal generated by the screen decoding unit in accordance with a signal from an input device or the screen information, It is possible to prevent power from being applied to the display device when not displaying images, resulting in the effects of lengthening the life of the display device and reducing power consumption of the image display device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an image display device according to the present invention.

FIG. 2 is a flowchart for explaining the operation of FIG. 1;

FIG. 3 is a block diagram showing a conventional image display device.

FIG. 4 is a diagram showing an example of the format of screen information.

[Explanation of symbols]

1 Input device 3 Central processing unit (CPU) 5 Display device 6 Power control section

Claims (1)

[Claims] Claim 1: A screen decoding unit that converts screen information data in screen information sent from a higher-level system into screen display data, a display device that displays the screen display data, and a signal from an input device or the screen. An image display device comprising: a power control section that controls power on and off of the display device in response to a control command signal generated by the screen decoding section according to information.