JPS63121088A - Dynamic display device - 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 [Industrial Application Field] The present invention relates to a dynamic display device that sequentially drives a plurality of light emitting elements to control a display, and particularly relates to a controller that drives a display device and a display device that controls a display device. The present invention relates to a dynamic display device in which the two are connected to each other via a connector or the like.

The device according to the invention has, for example, an input/output unit having a key switch array arranged in a matrix,
The present invention can also be used in devices having a dynamic display device, such as radios, electronic tuners, CD players, etc., which have many buttons such as a numeric keypad and also have a display device.

[Conventional technology]

FIG. 4 schematically shows a dynamic display device as an example of a conventional type. In the same figure, 40 is an input/output board, 41 is four LEDs (light emitting diodes) Ll'~
A display section consisting of L4', 42 a key switch array arranged in 4 rows and 4 columns, 43 and 44 connectors, and Sl
' indicates four signal lines for driving the LED, 82' indicates seven signal lines for driving the segment, S, / indicates four row signal lines for key scanning, and 84' indicates whether or not to operate the key switch. 50 is a control board, 51 is a CPU (central processing unit), 52 and 53 are l10 (input/output) ports, and 54 and 55 are connectors corresponding to the aforementioned connectors 43 and 44, respectively. , is shown.

Note that each LED of the display section 4°1 consists of seven segments A to G as shown in FIG.

In the conventional device shown in FIG. 4, key scanning is performed from the CPU 51 to the key switch array 42 via row signal lines S and 1, and if any key switch is operated at this time, , a signal indicating this is transmitted to the CPU 51 via the column signal line 84'. On the other hand, the CPU 51 connects the signal line 3. The LEDs of the display unit 41 are sequentially driven through the / to enable display, and when the above-mentioned response signal is received from the key switch array 42 in this state, the seven segments of the responding LEDs are By driving through the line St', information corresponding to the operated key switch is displayed by lighting.

FIG. 5 shows an example of the operation timing of the apparatus shown in FIG. 4. The example in FIG. 5 shows "7" and "4" as display information.
'', '2'', and 66'' are input from the key switch array 42. In actual operation, when the scanning signal is supplied from the CPU 51 to the key switch array 42 (when it is ON), The input information becomes valid and is temporarily latched in the aforementioned internal circuit.This latched input information, that is, "7", "
4", "2", and "6" are displayed in synchronization with the LED drive signal for each LED, as shown in FIG. 5. Each information "7" and "4".

Although the display forms of "2" and "6" are out of sync in terms of timing, since the frequency of the LED drive signal is extremely high, it visually appears that they are lit at the same time.

[Problem that the invention seeks to solve]

In the conventional device described above, the signal lines SI' and S,/ for driving the display section 41 and the signal line 3.1 for performing key scanning for the key switch array 42 are marked separately. Each connector 43, 44, 54, 5 occupies the input/output board 40 and control board 50.
Considering the area occupied by No. 5, etc., this is disadvantageous in terms of the scale of the device.

In particular, when the number of rows of the key switch array 42, that is, the number of row signal lines 3.1Φ, increases, the number of pins of the connectors 44 and 55 must be increased accordingly, and in some cases, the I10 board 53 itself may be Since it may be necessary to replace the I10 boat with another I10 boat having a larger number of ports, the scale of the device will further increase. This also leads to an increase in manufacturing costs.

Further, the key scanning signal does not necessarily need to be constantly supplied as shown in FIG.

That is, as described above, if there is even a slight temporal overlap between the period in which the scanning signal is output and the period in which the key is operated, the input information becomes valid and can be displayed.

On the other hand, similarly, the LED drive signals do not necessarily need to be supplied continuously and sequentially. This is because the frequency of the drive signal is extremely high, so it visually appears that the lights are turned on at the same time. That is, what has been described above applies to the scanning signal line 3. /, signal lines SI' and S for driving the display section, and / mean that there is no need to always provide dedicated signal lines for each. In other words, there is a problem in the effective use of each signal line.

The present invention has been made in view of the problems with the conventional type described above, and is a dynamic display device that reduces the number of parts such as signal lines and connectors, thereby reducing the scale of the device and reducing costs. is intended to provide.

[Means for solving problems]

According to the present invention, there is provided an input/output unit having a display section including a plurality of light emitting elements of multiple segments and a key switch array arranged in a matrix, and a key switch array that scans key switch operations of the key switch array. The display section is equipped with a control unit that sequentially drives the above-mentioned light emitting elements in response to an operation and performs display control, and the display section is connected to the control unit via a plurality of element drive signal lines and a plurality of segment drive signal lines. The key switch array is connected to the control unit via a plurality of column signal lines for instructing whether or not to operate a key switch, and a plurality of row signal lines for key scanning of the key switch array are connected to the control unit via the above-mentioned input lines. It is connected to be shared with either the element drive signal line or the segment drive signal line on the output unit side, and the control unit performs key scanning for the key switch array and display control for the display unit at different timings. , a dynamic display device is provided.

[Effect]

In the dynamic display device according to the present invention, the plurality of row signal lines for key scanning are shared with either one of the plurality of element driving signal lines or the plurality of segment driving signal lines. is reduced, thereby making it possible to downsize the device and reduce costs.

〔Example〕

FIG. 1 shows a dynamic display device as an embodiment of the present invention. In the figure, 10 is an input/output board, 20
indicates the control board. In the input/output board 10, 11 is 4
12 is a key switch array in which key switches are arranged in 4 rows and 4 columns, and 13 and 14 are connectors for external connection, respectively. Each L E D L I- of the display section 11
L 4 consists of seven segments A as shown in FIG.
- G, connected to the connector 13 via four signal lines S for driving the LEDs, and the seven segments of each LED are connected to the connector 13 via seven signal lines S2 for driving the segments. has been done. Further, the key inch array 12 is connected to the connector 14 via four column signal lines S4 for instructing whether or not to operate a key switch, and four row signal lines S3 for key scanning of the key switch array. are seven signals for driving segments on the input/output board 10 side! It is connected to a part of vIst, that is, to four signal lines.

On the other hand, in the control board 20, 21 is a CPU, which performs necessary data processing and control between the display section 11, the key switch array 12, and an internal circuit (not shown). 22 and 23 are I10 ports, which are connected between the CPU 21 and the display unit 110, and between the CPU 21 and the display unit 110, respectively.
and the key switch array 12, and performs data puffing and the like. 24 and 25 are external connection connectors, respectively, and correspond to the connectors 13 and 14 on the input/output board 10 side, respectively.

Specifically, the CPU 21 sends a key scanning signal to the key switch array 12, receives and decodes a signal from the array 12 instructing whether or not to operate a key switch, sends an LED drive signal to the display section 11, and performs the following functions: Segment drive signals are sent to the corresponding LEDs based on the decoding. In this case, as will be described in detail later, the key scanning signal is sent out by being integrated into the LED drive signal sending cycle.

FIG. 2 shows an example of the operation timing of the apparatus shown in FIG. In the example shown in FIG. 2, the display information is “7”, @4
The case where ", 62", and '61 are inputted from the key switch array 12 is shown.

As shown in Figure 2, the scanning signal and the four L
One cycle T0 is constituted by the ED drive signal.

While the scanning signal is being supplied to the key switch array 12 via a part of the signal line S2, that is, the signal line S' (period T), the display unit 11 cannot be driven via the signal line S2. Since this is not possible, the display section is in a non-display state.

During this period T, the CPU 21 reads a signal instructing whether or not the above-described key switch operation is to be performed, that is, key information. Although the period during which this scanning signal is output and the period during which key operations are performed are not always the same in terms of timing, the period T0 of the scanning signal is extremely short compared to the period during which key operations are performed, so in actual operation, all key human input information is It becomes effective.

Furthermore, according to the operation timing shown in Fig. 2, there is a non-display period T, but since the frequency 1/T0 of the LED drive signal is extremely high, it visually appears that the LEDs are lit at the same time. appear.

As described above, according to the device configuration shown in FIG. 1, the number of bins of connectors 14 and 25 and the number of I10 ports are reduced by the number of signal lines for key scanning, compared to, for example, a conventional configuration example (see FIG. 4). 23 boats can be reduced, thereby making it possible to reduce the scale of the device.

Further, by performing the key information reading operation multiple times during the non-display period T and then determining the key information, it is possible to prevent key chattering.

In the embodiment shown in FIG. 1, the scanning signal line S is shared with a part of the segment drive signal line S2, but the present invention is not limited to this. For example, the signal 'b% S3 is used as the LED drive signal line S. The same effect can be obtained even if they are shared.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the number of parts such as signal lines and connectors, thereby reducing the scale of the device and also reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a dynamic display device as an embodiment of the present invention, FIG. 2 is a diagram showing an example of the operation timing of the device shown in FIG. 1, FIG. 3 is an explanatory diagram of segments, and FIG. FIG. 5 is a block diagram showing a dynamic display device as an example of a conventional type; FIG. 5 is a diagram showing an example of the operation timing of the device shown in FIG. 4; (Explanation of symbols) IO...Input/output board, 11...Display section, 12
...Key switch array, 13.14...Connector, 20...Control board, 21
・CPU, 22. 23. I10 port, 24
．． 25...Connector, L1-L4...LED (light emitting diode), Sl.
...Signal line for LED drive, St...Signal line for segment drive, Ss... Row signal line for key scanning, S4... Column signal line for indicating presence or absence of key switch operation.

Claims (1)

[Scope of Claims] 1. An input/output unit having a display section including a plurality of light-emitting elements of multiple segments and a key switch array arranged in a matrix; scanning key switch operations of the key switch array; a control unit that sequentially drives the light emitting elements in response to the key switch operation and performs display control; connected to the control unit; the key switch array is connected to the control unit via a plurality of column signal lines for instructing whether or not a key switch is operated; and a plurality of rows for key scanning of the key switch array; The signal line is connected to be shared with either the element drive signal line or the segment drive signal line on the input/output unit side, and the control unit performs key scanning for the key switch array and display. A dynamic display device that performs display control for different parts at different timings. 2. The device according to claim 1, wherein the input/output unit and the control unit are connected to each other by respective connectors.