JP5862863B2 - Display device and display control method - Google Patents

Description

  The present invention relates to a display device, and particularly to a display device having a screen saver function.

  If the same image is continuously displayed at the same place on the display screen for a long time, the screen is burned and fixed. In particular, in the case of a display device provided in an industrial instrument such as a recorder, voltage, temperature, etc. must be constantly monitored, and the influence of screen printing is great.

  In general, in a display device having a screen saver function for preventing screen burn-in, a display controller that has received a screen saver display instruction creates a screen saver image and outputs it to a display. For example, as a first method, there is a method in which the entire display area is fixed to black data and is not displayed. As a second method, there is a method of displaying an image unrelated to the normally displayed image as a screen saver image on a part of the screen. In addition, the image may be moved within the screen at regular intervals. As a third technique, there is a technique in which all or a part of a normally displayed image is reduced and the reduced image is displayed on a part of the screen. There is also a method of moving the image within the screen at regular intervals.

Japanese Patent Laid-Open No. 08-286647

  However, in the first and second methods, the information of the display content that is normally displayed is completely lost. Therefore, the screen saver must be terminated for operation confirmation. In the third method, since the image is reduced, it is conceivable that part of the display content information is lost due to the display resolution.

  An object of the present invention is to provide a display device having a screen saver function capable of maintaining display accuracy without reducing the amount of information of display content that is normally displayed even when an image is reduced in screen saver display. Is to provide etc.

The display device of the present invention includes display data creating means for creating display data to be displayed on a display screen, display means for displaying an image on the display screen based on the display data created by the display data creating means, Screen saver control means for outputting a screen saver control signal for switching between a time display and a screen saver display, and if the screen saver control signal from the screen saver control means is not received, the display data creation The means creates normal display data corresponding to normal screen display in which N pixels adjacent to the display screen have the same gradation, and the display means adds the display data to the display screen based on the normal display data. A normal screen display is displayed as an image, and a screen saver from the screen saver control means is displayed. When a control signal is received, the display data generating means is for a screen saver corresponding to a reduced display in which the normal screen display is reduced by assigning the gradation of the N pixels to one pixel of the display screen. Display data is generated, and the display means displays the reduced display on the display screen based on the screen saver data. In the normal screen display, the display resolution is 1 / N of the display resolution of the display screen. It is characterized by performing display with .
According to this display device, even when a screen saver is executed, an image is always displayed, so that it is not necessary to end the screen saver for operation confirmation. Furthermore, even when a screen saver is executed, the display accuracy can be maintained without reducing the amount of information of the display content.

  The display means may display an image in a screen saver display area that is a part of the display screen based on the screen saver display data, and sequentially move the screen saver display area on the display screen.

  The display data creating means may create the screen saver display data in which a region other than the screen saver display region is a non-display region.

  The information included in the N pixels may include color information.

The display control method of the present invention includes a display data creation step for creating display data to be displayed on a display screen, a display step for displaying an image on the display screen based on the display data created by the display data creation step, A screen saver control step for outputting a screen saver control signal for switching between a normal time display and a screen saver display, and if the screen saver control signal based on the screen saver control step is not received, the display In the data creation step, normal display data corresponding to normal screen display in which N pixels adjacent to the display screen have the same gradation is created, and in the display step, the display screen is based on the normal display data. The normal screen display is displayed as an image on the screen. When the screen saver control signal based on the screen saver control step is received, the display data creation step reduces the normal screen display by assigning the gradation of the N pixels to one pixel of the display screen. Screen saver display data corresponding to reduced display is created, and in the display step, the reduced display is displayed as an image on the display screen based on the screen saver data. In the normal screen display, the display resolution of the display screen has The display is performed with a display resolution of 1 / N.
According to this display control method, even when a screen saver is executed, an image is always displayed, so that it is not necessary to end the screen saver for operation confirmation. Furthermore, even when a screen saver is executed, the display accuracy can be maintained without reducing the amount of information of the display content.

  According to the display device of the present invention, even when a screen saver is executed, an image is always displayed, so that it is not necessary to end the screen saver for operation confirmation. Furthermore, even when a screen saver is executed, the display accuracy can be maintained without reducing the amount of information of the display content.

  According to the display control method of the present invention, even when a screen saver is executed, an image is always displayed, so that it is not necessary to end the screen saver for operation confirmation. Furthermore, even when a screen saver is executed, the display accuracy can be maintained without reducing the amount of information of the display content.

The block diagram which shows the circuit structural example of a display apparatus. The figure which shows the example of a display of the display screen of normal display. The figure which shows the example of a display of the display screen of a screen saver control state. Explanatory drawing of the display screen of a screen saver control state.

  Hereinafter, an embodiment of a display device according to the present invention will be described. In the present embodiment, a display device having a screen saver function provided in an industrial instrument such as a recorder that displays characters, waveforms, and the like will be described as an example.

  FIG. 1 is a block diagram illustrating a circuit configuration example of a display device, and FIG. 2 is a diagram illustrating a display example of a normal display screen.

  As shown in FIG. 1, the display device according to the present embodiment includes a CPU 1 serving as a screen saver control means including a central processing unit and a main storage device of a computer, receives screen saver control information from the CPU 1, generates display data, and displays the display data. Display controller 2 as a display data creation means for outputting to 4, display memory 3 for storing the created display data and the like in a form that can be reused in display controller 2, and an image on the display screen based on the display data from display controller 2 And a display 4 as display means for displaying.

  The CPU 1 sends a screen saver control signal (ON / OFF) to the display controller 2. The display controller 2 creates display data by switching between normal display and screen saver display in accordance with a screen saver control signal, and transmits the created display data to the display 4. The display 4 displays an image on the display screen based on the display data.

  In the case of normal display, the display controller 2 creates display data (normal display data) using N pixels (N is a natural number of 2 or more) adjacent to the display screen as a unit, and is composed of N pixels. A full-screen display is performed with the same gradation (brightness for monochrome display and display color for color display) assigned to one unit of pixels. In the example of FIG. 2, the display data is generated with 2 × 2 pixels (N = 4) that are vertically adjacent to each other as one unit. In this case, the display 4 displays an image in the normal display area 4a of the display screen based on the display data. That is, display is performed with a display resolution of 1 / N of the display resolution of the display screen of the display 4. For example, when the display screen of the display 4 has a resolution of VGA (640 × 480 pixels), display is performed with a display resolution equivalent to QVGA (320 × 240 pixels).

  3A to 3D are diagrams illustrating display examples of a display screen for screen saver display, and FIG. 4 is an explanatory diagram of the display screen for screen saver display. FIG. 3A shows a display example in which the upper left quarter of the display screen of the display unit 4 is a screen saver display area 4b, and FIG. 3B shows the upper right quarter of the display screen of the display unit 4. 3 (C) is the lower left quarter of the display screen of the display 4 and FIG. 3 (D) is the lower right quarter of the display screen of the display 4 as the screen saver display area 4b. It is a display example.

  In the case of screen saver display, the display controller 2 creates display data (screen saver display data) in which one unit in a normal state is assigned to one pixel of the display screen. Therefore, a reduced image is created in which information (gradation) of N pixels in normal display is displayed with one pixel. For example, when the color information of N pixels is black, the corresponding one pixel is black. Therefore, the display area is an area that is 1 / N of the normal time (N is a natural number of 2 or more). The display controller 2 creates black pixel display data in the display area other than the screen saver display area 4b as the non-display area 4c. For example, when 2 × 2 pixels (N = 4) are set as one unit in the normal state, a quarter of the display screen of the display 4 is the screen saver display area 4b. In the example of FIGS. 3A to 3D, 320 × 240 pixels are the screen saver display area 4b.

  Then, by moving the screen saver display area 4b on the display screen of the display device 4, it operates as a screen saver for preventing screen burn-in. In the example of FIG. 3, for example, the screen saver display area 4b is displayed on the display screen as (A), (B), (C), (D), (A), (B), (C),. For example, it is operated as a screen saver for preventing screen burn-in by sequentially moving at regular intervals.

  As described above, in normal display, the display controller 2 creates normal display data with N pixels (N is a natural number of 2 or more) as a unit, and the display 4 is based on the normal display data. Display an image on the display screen. When the control signal for starting the screen saver is received from the CPU 1, the display controller 2 creates screen saver display data in which the information of the N pixels is one pixel, and the display 4 is based on the screen saver display data. The image is displayed on the display screen. Therefore, even when the screen saver is executed, since the image is always displayed, it is not necessary to end the screen saver for checking the operation. Furthermore, even when a screen saver is executed, the display accuracy can be maintained without reducing the amount of information of the display content. Therefore, even when the screen saver is being executed, the display contents can be confirmed in the same way as during normal display, and the occurrence of an abnormality can be quickly grasped. If switching from the screen saver display to the normal display can be performed manually, it is possible to perform confirmation by the normal display in an emergency or the like.

  In the above embodiment, the display device provided in the recorder has been described as an example. However, the present invention can be applied to any device that does not need to perform display that uses the maximum resolution of the display screen during normal display. The present invention can be applied to the case where desired information can be displayed even if the same gradation is given to a plurality of adjacent pixels and the resolution is lower than the capability of the display screen.

  In the above embodiment, an example is shown in which 2 × 2 pixels (N = 4) are used as one unit, but 3 × 3 pixels (N = 9) or a larger number of pixels may be used as one unit. Good. Further, in the above embodiment, the screen saver display area is divided into four areas, but the screen saver display area is sequentially moved by a very small interval (for example, one pixel interval) at the time of the screen saver so that the reduced display is displayed. You may make it slide slowly on top. Also in this case, even when the screen saver is being executed, the display contents can be confirmed in the same manner as during normal display.

  Moreover, although the example which displays a character string was shown in the said embodiment, the same method is applicable also to graphic displays, such as a waveform.

  The scope of application of the present invention is not limited to the above embodiment. The present invention is widely applied to display devices including screen saver control means for transmitting a screen saver control signal.

1 CPU (screen saver control means)
2 Display controller (display data creation means)
4. Display (display means)

Claims (5)

Display data creation means for creating display data to be displayed on the display screen;
Display means for displaying an image on the display screen based on the display data created by the display data creating means;
Screen saver control means for outputting a screen saver control signal for switching between normal display and screen saver display;
In a display device comprising:
When a screen saver control signal is not received from the screen saver control means, the display data creating means is a normal display data corresponding to a normal screen display in which N pixels adjacent to the display screen have the same gradation. And the display means displays the normal screen image on the display screen based on the normal display data.
When a screen saver control signal is received from the screen saver control means, the display data creation means reduces the normal screen display by assigning gradations of the N pixels to one pixel of the display screen. Display data for screen saver corresponding to the reduced display, and the display means displays the reduced display on the display screen based on the screen saver data ,
In the normal screen display, display is performed with a display resolution of 1 / N of the display resolution of the display screen.   The display means image-displays the reduced screen in a screen saver display area which is a part of the display screen based on the screen saver display data, and sequentially moves the screen saver display area on the display screen. The display device according to claim 1.   The display device according to claim 2, wherein the display data creating unit creates the screen saver display data in which a region other than the screen saver display region is a non-display region.   4. The display device according to claim 1, wherein the information included in the N pixels includes color information. 5. A display data creation step for creating display data to be displayed on the display screen;
A display step of displaying an image on the display screen based on the display data created by the display data creation step;
A screen saver control step for outputting a screen saver control signal for switching between normal display and screen saver display;
In a display control method comprising:
When a screen saver control signal based on the screen saver control step is not received, the display data creation step includes normal display data corresponding to a normal screen display in which N pixels adjacent to the display screen have the same gradation. In the display step, the normal screen display is displayed as an image on the display screen based on the normal display data.
When a screen saver control signal based on the screen saver control step is received, the display data creation step reduces the normal screen display by assigning gradations of the N pixels to one pixel of the display screen. The display data for the screen saver corresponding to the reduced display is created, and in the display step, the reduced display is displayed as an image on the display screen based on the data for the screen saver .
In the normal screen display, display is performed at a display resolution of 1 / N of the display resolution of the display screen .

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