JPS61122692A - Display terminal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display terminal device, and particularly to a display terminal device whose display is made of a flat transparent body in which pattern display electrodes are embedded.

Terminal devices are indispensable in information processing systems, mineral exchange systems, etc., and are equipped with an information input/output operation unit, such as a keyboard. Further, a so-called display terminal device with a display is used in a more high-class terminal device. Displays that do not simply display output data are now available, but also allow input of other data. The present invention refers to improvements in such display terminals.

[Conventional technology]

The mainstream display in conventional display terminal devices is CRT (Cathode-Ray Tube).
Met. In recent years, flat displays have also come into widespread use. This flat display is a liquid crystal panel, an EL (Electro-Lum1nes)
) panels, plasma display panels, etc. are currently in practical use.

[Problem that the invention seeks to solve]

In a display terminal device using the CRT as a display, the overall size of the display terminal device is inevitably large due to its structure, and its use as a tabletop device for general offices is severely restricted. Therefore,
With the adoption of the above-mentioned flat display, display terminal devices have been significantly downsized. However, even if such a flat display is used, although it may be a one-line display, a pattern display requires multiple lines.
Moreover, a problem arises in that a space corresponding to the display area of the display must always be secured in the vicinity of the information input/output operation section.

[Means for solving problems]

SUMMARY OF THE INVENTION An object of the present invention is to provide a display terminal device that solves the above-mentioned problems. A means for opening/closing the display terminal device main body to a closed state or an Fi open state is provided, and the display pattern in the closed state when the display section is viewed from the front and the display pattern in the open state when viewed from the back side are not reversed. It is provided with scan conversion or read operation conversion means for changing the raster scanning procedure. It is assumed that the display pattern is provided via a single video memory.

[Effect]

If the display section is made to be able to take either the closed state or the open state, the display terminal device can be made smaller because it is always in the closed state except when it is in the open state. Depending on the purpose of use, scanning conversion means or readout operation conversion means is used to obtain the correct display pattern in either the closed state (viewed from the front of the display unit) or the open state (viewed from the back side of the display unit). , the raster scanning procedure is different between the closed state and the open state.

〔Example〕

1A and 1B are perspective views showing an example of the configuration of a display terminal device according to the present invention in a 1" open state and a 1 closed state, respectively. The display terminal device 1o shown in FIGS. 1A and 18 is A compound telephone used in a switching system is taken as an example. However, this is not limited to this; in the case of an information processing system, this corresponds to a data terminal that exchanges data with a computer.The display terminal device 10 is a display terminal. The main body 11 includes an information input/output operation section 13, such as a keyboard and a handset H8.
is provided. Moreover, various circuits (described later) are built in therein.

As shown in FIGS. 1A and 1B, the display unit 12 of the display terminal device 10 can be in two states: an open state and a closed state. In order to ensure this opening and closing, the opening and closing means 4
is provided. In its simplest form, this could be a hinge.

Normally, the display section 1 is kept in the closed state shown in Figure 1B.
Look at the display pattern from the front of 2. In this case, since the information input/output operation section 13 is often not used, the display section 12 is closed to cover it. Thus,
Since the display section 12 and the main body 11 are integrated, the display terminal device IO becomes extremely compact.

On the other hand, if it is necessary to transmit data, the information input/output operation section 13 must be operated.

For this purpose, the display section 12 is opened as shown in FIG. 1A, and the operation section 13 is turned on so that it can be operated directly. In this case as well, the user looks at the display pattern on the back side of the display unit 12 so that input data can be monitored or received data can be displayed.

Therefore, the display section 12 must be constructed of a flat transparent body in which a pattern display element (eg, liquid crystal, EL, plasma display, etc.) is embedded. This is to make the display pattern appear on both the front and back sides. What is more important is that not only the display pattern appearing on the front side but also the display pattern appearing on the back side must be correctly visible to the operator. What looks correct means that the pattern is reversed, an upside-down K,
(turned inside out) is something not to do. Therefore, for example, a button switch 15 is provided at the position shown in FIG. 1A, and when the display section 12 is opened and turned over, the button switch 15 is turned on and a predetermined circuit is operated. This circuit is a scan conversion circuit and a readout conversion circuit, which will be explained in detail later, but this is because the display pattern when the display is viewed from the front in the closed state and the display pattern when it is in the open state when viewed from the back are not reversed. It serves to make changes to the raster scanning procedure.

Figure 2 is a page showing an overview of the display terminal device.
It is a lock diagram. The block 10 in this figure is the display terminal device shown in FIGS. 1A and 1B, and in the above example, it is a compound telephone in the conversion system, so it is connected to a private branch exchange (PBX) 2 through an extension 22. This example shows a situation in which it is connected to The terminal control unit 23 is a part that controls the entire display terminal device including the handset H8 and the like, but it is not particularly relevant to the present invention. The main body of the display section 12 is the pattern display element 27 described above, which forms a large number of dots (pixels).

These dots are driven by the drive section 26, causing discharge in the case of a plasma display, and inverting the crystal state in the case of a liquid crystal display. The display control unit 25 causes the drive unit 26 to raster scan and form a display pattern.
In fact, the display pattern is stored in the biological memory 24, and its contents change from moment to moment. In this case, the content (display pattern) is
Normally (
stored so that it can be seen (without flipping).

3A and 3B are displays of the present invention.
3A is a diagram for explaining the raster scanning order and data readout order used in the terminal device. ◇ FIG. 3A shows the raster scanning route on the display screen of the display unit 12. First, the display section 12 is in a closed state,
When viewed from the front of the tab, the raster scanning order is the first row,
The second row...the (n-1)th row, then the nth row may be proceeded in the order shown by the solid line arrows in the figure. FIG. 3B is a diagram showing the order in which display pattern data is read from the video memory (24 in FIG. 2). line,
2nd line...(n-1)th line, along the nth line, proceed in the order 1, 2...n-1, n surrounded by solid line circles and in the direction of the solid line arrow. .

On the other hand, in FIG. 3A, when the display unit 12 is in the open state and is illuminated from the surface 9M, the raster scanning order is along the nth row, the (n-1)th row, . . . the second row, the first row. It is only necessary to proceed in the direction indicated by the dotted line arrow in the figure, in the reverse direction from when it is in the closed state. At this time, the display data reading order is
It is the same as in the closed state. On the other hand, if the data reading order of display pattern data from the video memory is advanced in the order 1, 2...n-1, n surrounded by dotted line circles and in the direction of the dotted line arrow, then the raster scanning direction is , the solid line shown in FIG. 3A may be used as in the closed state.

4 (2) and (6) are diagrams for schematically explaining the reversal of the raster scanning order. ). In order to form exactly the same pattern as this arbitrary number pattern on the back surface of the display section 12,
By reversing the raster scanning order in Figure 4 (4),
You can perform raster scanning like this. By doing so,
When the display screen in Figure 4 (6) is turned over and viewed from the back, the pattern is exactly the same as that in Figure 4. On the other hand, it is also necessary to change the order in which display pattern data are successively output from the video memory (24 in FIG. 2). This will be explained below.

FIG. 5 is a diagram schematically representing the data arrangement within the video memory. In this figure, DIl~D13°D21~D2
3-...Dnl to Dn3 are the first row, second row, and
. . . Display pattern data for the n-th row, each row of which is represented by a 3-byte configuration. Here, when performing raster scanning shown by the solid line arrow in FIG. 3A and data reading shown by the solid line arrow in FIG. 3B, that is, when performing raster scanning shown by the solid line arrow in FIG.
When the pattern shown in FIG. 4 (4) is viewed from the front with a closed MK, the order of reading data from the video memory 24 can be advanced in accordance with the solid line arrow A in FIG. On the other hand, when performing raster scanning as indicated by the dotted line arrow in FIG. 3A or data readout as indicated by the dotted line arrow in FIG.
When viewing the pattern () in Figure 4 from the back side with the camera in the open state, the order of reading out data from the video memory 24 is as follows: B1→...B(n-1)→Bn in Figure 5. Good. However, arrow B1 shown in FIG. 5...
f3 (n - 1) * B The data read operation along n is slightly more troublesome than the data read operation along arrow AK. Therefore, the following method can be used to improve this problem.

FIGS. 6A and 6B are diagrams for explaining other methods of raster scanning order and data reading order used in the display terminal device of the present invention. The view of these figures is almost the same as that of FIGS. 3A and 3B. When the display section 12 is in the closed state and viewed from the front of the tab, the raster scanning order (solid arrow in FIG. 6A) and data readout order (solid arrow in FIG. 6B) are as shown in FIGS. 3A and 3B, respectively. The case is exactly the same. However, when the display unit 12 is in the open state and viewed from the back side of the tab, the scanning direction is reversed (left←right) compared to when it is in the closed state (left→right), as indicated by the dotted arrow in FIG. 6A. If the scanning direction is also reversed in this way, the video memory 2
The data reading order from 4 is the order 1.2...n-1,n (same as in FIG. 3B) surrounded by the dotted line circle shown in FIG. 6B, and the direction of the dotted line arrow (in FIG. It is better to proceed in the opposite direction than in the case of . This data reading order corresponds to arrow C in FIG. 5, and as in the case of arrow A in the same figure,
The read operation becomes simple.

FIG. 7 shows an overall circuit in which a conventional display drive control circuit and peripheral circuits are slightly modified based on the present invention. Note that the reference numbers used in this figure correspond to the reference numbers shown in FIG.

That is, the display section 12 can be reversed as shown by the arrow U without having the pattern display element 27 embedded therein. The drive section 26 (Fig. 2) includes an X-direction drive section 26-X (with a built-in drive circuit) and a Y-direction drive section 26-y (with a built-in drive circuit).
and performs raster scanning. Display control unit 25
(FIG. 2) consists of a raster scan control section 258 and a read operation control section 25R, and the control section 25R is a video memory 2.
The control unit 258 receives the display pattern data D from the video memory 24 and provides it to the pattern display element 27 by raster scanning. That is, the control unit 258 provides the counter output of the y-direction drive address counter 31 to the y-decoder 32 to perform scanning in the y-direction, and also provides the count output of the X-direction drive address counter 330 to the X-decoder 34 to perform scanning in the X-direction. conduct.

The y-decoder 32 supplies display pattern data D for each dot. Overall timing control is performed by a timing circuit 35.

By the way, K that realizes the display terminal device 10 according to the present invention includes scan conversion circuits 41 and 4 in the control section 25S.
1' is provided, and a read operation conversion circuit 42 is provided in the control section 25R.
These should be provided as button switch 1 in Fig. 1A.
5 is turned on, ie, in the open state, it becomes active and shifts to the operation shown by the dotted line arrow in FIGS. 3A and 3B or 6A and 6B. Button switch 15
When is off, ie closed, circuits 41, 42 and 42' are inactive and normal operation is performed as indicated by solid arrows in these figures.

The above-mentioned scan conversion circuit 41 and read operation conversion circuit 4
2.42' may be formed separately, but in reality it can be easily realized by partially modifying an existing circuit. However, if some form of scan conversion means and read operation conversion means are present, the display terminal device of the present invention can be realized without major hardware changes. Specifically, an up/down counter or a reversible shift register may be used.

FIG. 8 is a circuit diagram showing the first column realizing the scan conversion means, which corresponds to the y-direction drive address counter 31 and the scan conversion circuit 41 (or 33 and 41') in FIG. As shown in the figure, it consists of an up/down counter 51, and when the button switch 15 described above is off (closed state),
The tT/D (up/down) control input becomes "L" level, the counter 51 works as an up counter, and the third A
and realizes y-direction scanning from top to bottom in Figure 6A.

On the other hand, due to the on (open state) of the button switch 15! 0,
The U/D control input becomes "H" level, and the counter 51 functions as a down counter, realizing scanning in the y direction from the bottom to the top in FIGS. 3A and 6A.

A counter similar to the up/down counter 51 shown in FIG. 8 can also be employed as the X-direction drive address counter shown in FIG. If the apparatus 10 is designed to perform scanning in the direction of the solid line and dotted arrows in FIG. 35, the U/D control in FIG. L'' level and function as an up counter.On the other hand, if the design is to scan in the X direction indicated by the solid line and dotted arrow in Figure 6A, the U/D control input in Figure 8 can be set to the button switch. 1
5 is turned off (closed state), the up counter is set to 'L' level (scanning from left to right in the X direction), while button switch 150 is turned on (open state M) to set the U/D control input to 'H'. A down counter may be obtained as the # level (scanning from right to left in the X direction).

FIG. 9 is a circuit diagram showing a second example of realizing the scan conversion means, which corresponds to the y-direction drive address counter 31, decoder 32, and scan conversion circuit 41 (or 33, 34, and 41') in FIG. . As shown in the figure, it consists of a reversible shift register 61, and the CNT (control) input is @ according to the on or off of the button switch 15.
When it is at the H" or 1L" level @L" level (closed state), it shifts from the top to the bottom of 1111 bits,
5@H# level (open state), the "1" bit shifts from the bottom to the top in the diagram. Reference numeral 62 denotes a gate that opens and closes in response to 1" II Q # of display pattern data D. Such a reversible shift register can naturally be used for scanning in the X direction. However, the gate 62 is not required for scanning in the X direction. , as it is, the X direction drive unit 2
6-x.

FIG. 10 is a circuit diagram showing an example of realizing the read operation conversion means, and in particular, the read operation control section 25R of FIG.
It is employed when performing the data read operation of FIG. 3B.

As shown, there are two up/down counters 71 and 72. Counter 71 specifies bytes for each row in the video memory 24 of FIG. 5, and counter 72 specifies each row. First, when reading out the solid arrow in FIG. 3B, that is, when reading out along the arrow A in FIG. 5 with the button switch 15 off (closed), the control register 73 contains 'OO'. Bit designation is performed. From this K, both counters 71 and 72 are "L" U.
/D1fi11 (Receives 41 input, both counters work as up counters. As a result, the byte specification progresses as shown in FIG.
EN).

That is, the count output of the counter 72 is counted up by one. As a result, the 9th row designation is shifted from the first row to the second row, and the reading progresses from D21 to D22 to D23 in FIG. On the other hand, when reading out the dotted line arrows in FIG. 3B, when the thumb button switch 15 is on (open) and the arrows B1→...B(n-1)→Bn in FIG. 5 are read out, , a bit designation @01m is made in the control register 73. From this K, counters 71 and 72 receive U/D control inputs ``L#'' and @H'', respectively, and function as an up counter and a down counter, respectively. As a result, the byte specification is Dn1→Dn2→D in Figure 5.
Then, at Dn3, a carry output CR is generated to enable the counter 72 (EN). The count output of the counter 72 is counted down by one. As a result, the line specification moves from the first line to the (n-1)th line, and in the same way, the last line is D21→D22→D in FIG.
Reading is performed as follows: 23→Dll→D12→D13. In this case, the counter 71 always functions as an up counter, but this is not a separate problem from the economic point of view of sharing parts with the counter 72.

On the other hand, if it is designed to perform the read operation shown in FIG. 6B, the conversion means in the read operation control section 25R (FIG. 7) is realized by one up/down counter, and the button switch 15 is turned off ( In the closed state), this is turned into an up counter and the reading indicated by arrow A in FIG. 5 is performed. Conversely, by turning on (opening) the button switch 15, it becomes a down counter and the reading indicated by arrow C in FIG. 5 can be achieved. In addition,
The up/down counter in the read operation control described above may also be replaced by a reversible shift register.

6 [Effects of the Invention] As explained above, according to the present invention, by making the display part visible from the front as well as from the JIk surface, the display part can be placed in either the open state or the closed state with respect to the main body. It can also be placed in Therefore, by opening the display section only when necessary, it is possible to keep it closed at all times, so that the display terminal device can be made smaller.

[Brief explanation of the drawing]

1A and 1B are perspective views showing an example of the configuration of a display terminal device according to the present invention in a 1" open and 1 closed state, respectively; FIG. 2 is a block diagram showing an outline of the display terminal device; 3A and 3B are diagrams for explaining the raster scanning order and data readout order used in the display terminal device of the present invention, and FIGS. 4 and 4 are diagrams for schematically explaining the reversal of the raster scanning order. , FIG. 5 is a diagram schematically representing the data arrangement in the video memory, and FIGS. 6A and 6B are diagrams for explaining other methods of raster scanning order and data readout order used in the display terminal device of the present invention. , FIG. 7 is an overall circuit with slight circuit changes based on the present invention compared to a normal display drive control circuit and peripheral circuits, and FIG. 8 is a circuit diagram showing a first example of realizing scan conversion means. FIG. 9 is a circuit diagram showing a second example of realizing the scan conversion means, and FIG. 10 is a circuit diagram showing an example of realizing the read operation conversion means. 10...Display terminal device, 11...Main body, 1
2°... Display unit, 14... Opening/closing means, 24...
...Video memory, 27...Pattern display element, 25
S... Raster scan control unit, 25R... Readout operation control unit, 41, 41'... Raster scan conversion circuit, 42
...Read operation conversion circuit.

Claims (1)

[Scope of Claims] 1. A main body that includes at least a video memory, a read operation control unit that reads display pattern data from the video memory, and a raster scan control unit that performs raster scanning on the read display pattern data; A display terminal device comprising a display section that is attached to the main body and that makes a display pattern according to the display pattern data appear based on the raster scanning, wherein the display section is a flat transparent body in which a pattern display element is embedded. provided with an opening/closing means for opening and closing the display section on the main body so that the display section is in a closed state when viewed from the front or an open state when viewed from the back side, and the display in the closed state is formed by: A conversion means for changing the raster scanning or the readout operation is provided in the raster scan control section or the readout operation control section, respectively, so that the pattern and the display pattern in the open state are not reversed. Characteristic display terminal device.