JPH0428151Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a terminal display device suitable for use in an image processing system.

(b) Prior art and its problems Generally, when performing various image processing on images displayed on a CRT display, an operator issues operation commands from a keyboard or the like while looking at the screen. In this case, the operator must view the displayed image as well as various character strings displayed in response from the image processing system.
In this way, in image processing, it is necessary to proceed with operations while simultaneously viewing the image display and the character display.

By the way, when an image and text are displayed overlappingly on a single CRT display, the image disappears in the area where the text is displayed, making the image difficult to see. Therefore, it would be convenient if images and characters could be displayed separately, if necessary.

However, in conventional devices, image data and character data are overwritten in one memory, and then both image data and character data are read out from this memory and output to a CRT display. For this reason, the image data in the overwritten part is replaced with character data and disappears.Therefore, if you want to display only the image next time, that part of the image will be missing and displayed. This will cause some inconvenience.

In order to improve this, an image memory and a character memory are provided separately, and each output of image data read from the image memory and character data read from the character memory is switched as appropriate to display the image on the CRT display. A device that can display characters has been proposed. However, this configuration requires two memories and a circuit for writing and reading data to both memories.
There are disadvantages such as a large increase in costs and the complexity of the software.

Furthermore, it is possible to install a CRT display dedicated to displaying images and a CRT display dedicated to displaying text in parallel, but this requires constant monitoring of the two screens, which is not convenient to use.

The present invention was developed in view of these circumstances, and its purpose is to enable images and text to be displayed overlapping each other or displayed separately, even with a relatively simple configuration. shall be.

(c) Means for solving the problem In order to achieve the above-mentioned purpose, the terminal display device of the present invention has a CRT display with a liquid crystal panel dedicated to displaying characters that covers the display screen that can be swung and turned over. At the same time, a detection sensor is provided for detecting a reversed state of the liquid crystal panel;
The present invention is provided with display reversing means for reversing the character display on the liquid crystal panel vertically or horizontally in response to a detection signal from the detection sensor.

(d) Function Normally, the display screen of the CRT display is covered with the liquid crystal panel. In this case, when characters are displayed on the LCD panel, that part overlaps with the image displayed on the CRT display, but since the area where characters are not displayed is transparent, the image displayed on the CRT display is passed through the LCD panel as it is. You can see it.

On the other hand, if you want to see images and text separately, for example, you can flip up the liquid crystal panel above the CRT display screen. Then, the front and back sides of the liquid crystal panel are reversed, and the detection sensor detects this reversed state and outputs a detection signal. In response to this detection signal, the display inverting means inverts the characters displayed on the liquid crystal panel vertically. Therefore, as a result, the characters are displayed in an erect state on the liquid crystal panel, and can be viewed separately from the displayed image on the CRT display.

(e) Embodiment FIG. 1 is a perspective view of a terminal display device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of essential parts of the device. In these figures, numeral 1 indicates the entire terminal display device, and 2 indicates a CRT for displaying images.
Display 4 is a liquid crystal panel dedicated to displaying characters. This liquid crystal panel 4 is a laminated color matrix liquid crystal panel, and is connected by a hinge 6.
It is attached to the CRT display 2 so as to cover the display screen 8 so as to be swingable and reversible.
Further, a micro switch 10 is provided at the front right side of the CRT display 2 as a detection sensor for detecting the reversed state of the liquid crystal panel 4.

Further, 12 is an image memory in which image data for image display is stored, and 14 is a TV signal conversion circuit that converts the image data read from the image memory 12 into a TV signal and outputs it to the CRT display 2. 16 is a character memory in which character data is stored;
18 is a low scan type character generator which inputs character data read from the character memory 16 as a code and outputs a corresponding character code for character display; 20 is a character code from the character generator 18; This is a drive circuit that drives the liquid crystal panel 4 according to the following.

22 is a row counter for selecting a row electrode of the liquid crystal panel 4, and in this example, an up-down counter is applied. 24 is a switching circuit that switches the connection of the up/down terminals of the row counter 22 in response to a signal from the microswitch 10. and,
The row counter 22 and the switching circuit 24 constitute a display reversing means for vertically reversing the character display on the liquid crystal panel 4 in response to the detection signal from the detection sensor 10. 30 is a column counter for selecting column electrodes of the liquid crystal panel 4, and 32 is a clock generator for generating clock pulses of a constant frequency.

Next, in the terminal display device 1 of this embodiment,
The operation when displaying images and characters will be explained.

Normally, LCD panel 4 and CRT display 2
so as to cover the display screen 8 of. In this state, the image data stored in the image memory 12 is read out in synchronization with the clock pulse from the clock generator 32, and the image data is converted into a TV signal by the TV signal conversion circuit 14 and displayed on the CRT display 2. Since it is output, CRT display 2
The image is displayed. On the other hand, for character display, a column counter 30 sequentially selects column electrodes of the liquid crystal panel 4 in response to clock pulses. Further, the column counter 30 outputs a pulse every time it counts one row of the column electrodes of the liquid crystal panel 4 from left to right, and this pulse is applied to the row counter 26 via the switching circuit 24. In this case, since the switching circuit 24 switches the connection to the up terminal UP of the row counter 26, the row counter 26 counts up every time a pulse is applied from the column counter 30, and as shown in FIG. 3a, the row counter 26 counts up. Row electrodes of the liquid crystal panel 4 are selected in the order of symbols 1, 2, 3, . . . . Further, character data stored in the character memory 16 is read out in synchronization with clock pulses from the clock generator 32 and provided to the character generator 18. Further, since the output pulse from the row counter 26 is applied to the character generator 18, the character code for character display is outputted from the character generator 18 in synchronization with the counting operation of the row counter 26. The signal is applied to the drive circuit 20. The drive circuit 20 drives each electrode of the liquid crystal panel 4 selected by the row counter 26 and column counter 30 in accordance with this character code. As a result, characters are displayed on the liquid crystal panel 4. The part of the liquid crystal panel 4 where characters are displayed is the CRT display 2.
However, since the portion where characters are not displayed is transparent, the display image on the CRT display 2 can be viewed as is through the liquid crystal panel 4.

On the other hand, if it is desired to view the image and text separately, the liquid crystal panel 4 is flipped up above the display screen 8 of the CRT display 2. Then, both the front and back sides and the top and bottom positions of the liquid crystal panel 4 are reversed. Then, this front-back reversal is detected by the microswitch 10 and a detection signal is output. The switching circuit 24 switches the connection to the down terminal down of the row counter 26 in response to this detection signal. As a result, the row counter 26 counts down every time a pulse is applied from the column counter 30, and
The row electrodes are selected in the order of codes i, i-1, i-2, . . . . For this reason, when the liquid crystal panel 4 is viewed from the front side, the characters are displayed inverted as shown in Figure 3b, but in reality, the vertical position of the liquid crystal panel 4 is reversed when viewed from the back side. As a result, when the liquid crystal panel 4 is faced toward the display screen 8 of the CRT display 2 and viewed straight ahead, the characters will be displayed in an upright state. In this way, characters are displayed on the liquid crystal panel 4 and images are displayed on the CRT display 2 separately.

In this embodiment, the liquid crystal panel 4 is attached to the top of the CRT display 2, so the characters are displayed upside down as the liquid crystal panel 4 is turned over. If it is attached to the right or left side of the screen, the characters must be displayed horizontally inverted. Further, this terminal display device 1 can be fully applied not only to image processing systems in the field of science and technology, but also to new media such as CAPTAIN.

(f) Effects As described above, according to the present invention, even with a relatively simple configuration, images and characters can be displayed overlapping each other or displayed separately. Therefore, the complexity of conventional software is eliminated, and excellent effects such as being realized at low cost are exhibited.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a perspective view of a terminal display device, Fig. 2 is a block diagram showing the main structure of the device, and Fig. 3 shows the state of character display on the liquid crystal panel. FIG. 1... terminal display device, 2... CRT display, 4... liquid crystal panel, 10... detection sensor (micro switch), 28... display reversing means.

Claims (1)

[Scope of utility model registration request] A liquid crystal panel dedicated to displaying characters that covers the display screen is attached to the CRT display so that it can be swung and turned upside down, and a detection sensor is installed to detect the upside down state of the liquid crystal panel, and it responds to the detection signal from this detection sensor. A terminal display device comprising display reversing means for reversing characters displayed on the liquid crystal panel vertically or horizontally.