JPS6024970B2 - Multi-input keyboard display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a keyboard, and particularly to its display.

Conventionally, some keyboards include mechanical contacts arranged in a matrix, and others include light emitting elements arranged in a matrix. In the former case, a light emitting element matrix with the same number of keys as the number of keys is required to confirm key operation, and if the light emitting energization is to be static, an energizing line is required for each light emitting element. When the number of elements is mxn, mxn energizing lines are required.

Furthermore, when energizing each light emitting element dynamically, that is, in a pulsed manner, A×B=m×n, and A1B energizing lines may be provided. However, in this case, in a multi-input keyboard with a large number of keys, that is, a large number of light emitting elements, the light emitting activation time allotted to one light emitting element decreases, and the light emitting activation cycle becomes longer. When the light emitting element is energized with pulses and visually observed, if the light emitting period is short, it will be visually recognized as continuous light emission, and if the light emitting period is long, flickering will be perceived.
Furthermore, as the light emission energizing pulse width is made shorter, the light emission becomes impossible to visually recognize. Therefore, when the number of energizing signal lines is A+B and the light emitting elements are lit in pulses, the number of light emitting elements is limited, and the number of keys is also limited. In the latter case, the light emitting elements in a matrix are energized with a pulse cycle that flickers or cannot be seen, and the light emitted from the light emitting elements at the desired address is activated in a pen-like manner. It is detected by a photoelectric detection element installed at the end of the container, and by this detection, the progress of a counter used for specifying an address on the matrix is stopped, and the light emitting element at that address is activated to continuously light up. In this case, A
Only 10B matrix wiring is required, and no mechanical contacts are required. However, since the counters etc. on the matrix stop incrementing as described above, it is necessary to reset the continuous light emission before specifying the next address.
It is not possible to continuously display and add addresses that are set one after another. Therefore, it is not possible to check how much input has been made on the keyboard, and it is necessary to check the output on a display device, printer, etc. SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-input keyboard display device in which the display is added for each key input operation and the number of display activation lines is relatively small. In other words, it is an object of the present invention to provide a display device for a multi-input keyboard having an additive display capability comparable to a static display and a small number of energized lines comparable to a secondary pulse energized lighting. This is what I did. FIG. 1 shows one embodiment of the present invention.

In FIG. 1, 1. , ~lnm indicates a wiring intersection of the light emitting element matrix wiring 2, and a light emitting diode is connected to this intersection. Therefore, the number of light emitting diodes is nxm
It is individual. One pole of each light emitting diode is connected to each row line of m rows, and a pole of each light emitting diode is connected to each column line of n columns. 3 is a row scanner, which in this example is composed of a counter 31 and a decoder 32.

4, to 4n are circular shift registers used as storage devices.

The same clock pulse is applied to the shift pulse input terminals of the counter 3 and shift registers 41 to 4n.
The period of this clock pulse (CLOCK) is T^/m. 5 is a comparator, and 6 is a decoder.

A display signal (DISPLAY) is applied to each shift register 4, to 4n when the display is activated. Next, the operation of this embodiment will be explained. By counting clock pulses with a period of T^/m, the count value of the counter 3 increases sequentially.

When this counter 3 counts up m-1, it returns to 0 and then counts up again from 0.
Counter 3. In response to the output code signal, the decoder sequentially generates pulses at m output terminals. In the drawing, m=
1. Shown as n=20. FIG. 2 shows the correlation between the pulses at each output end of the decoder 32 and the clock pulse CLOCK. Output P of each output line P, ~P, o of the decoder 32
, S to P, oS are the pulses shown in FIG. 2, and the pulse period is T^. 1/m of this pulse period (1/m in Figure 1)
/10) is the period of the clock pulse CUOCK. The period T^ is set to be a short enough period that no flicker is felt when the light emitting element is pulse-energized. The lines P, ~P, o are energized at a cycle equal to or less than this cycle. The number m (10) of o and the period of the clock pulse CLOCK are determined. As a result of the clock pulse CLOCK being applied to the shift registers 4, ~4n, each register 4, ~4n is simultaneously shifted every T^/m (T^/10 in the illustrated example), that is, the address is changed, and the number of addresses, that is, the number of shift stages. is m (10 in the illustrated example), so selection activation of lines P, ~P, o, write and read address of shift register (shift)
and have a one-to-one correspondence. In the standby state, the display activation signal is not written in the shift registers 4.about.4n, so the intersection points 1, . ~ None of the light emitting elements on one plate emit light and are in a state of being in a state. In this state, a signal DISPLAY representing display activation is applied,
When the clock pulse CLOCK arrives, pulses P, S to P, are generated on each output line P, to P, o of the decoder 32 as shown in FIG. Therefore, the signal DI is input to shift registers 4 and 4n.
SPLAY is not written.

Therefore, there is no light emitting energizing signal from the shift registers 4, to 4n, and none of the light emitting elements are energized to light up. So now, comparator 5 has No. The code representing the row address of i is also written in M. The code representing the column address of j is sent to decoder 6.
When the count value of the counter 3 is i, that is, the pulse Pi is applied to the output line Pi of the decoder 32.
When S is present, a command signal is given to the decoder 6 from the comparator 5, and the output line axis of the decoder 6 is output. A write signal appears at j. As a result, No. The display enable signal DISPLAYI is written into the shift register 4i of i.
The written display activation signal 1 is shifted every clock pulse and appears at the output end of the shift register 4j after m (IQ range) clock pulses arrive. During this period, the output pulse of the decoder 32 goes through one cycle and returns to the line P.
It's on top of j. As a result, the light emitting element at ljj is energized to light up and remains lit for T/m. Since the output signal of the shift register 4j circulates to the input side, the light emitting element of lij is eventually lit in pulses at a period of T^. In this way,
The lighting is continued until the shift register 4j is reset (cleared) even after the address code (i, i) to the comparator 5 and encoder 6 disappears. Similarly, then i
When the row address and column address of ±x,i±y arrive at the comparator 5 and decoder 6, respectively, li±x,j
The light emitting element at position y is now energized to light up. In this way, unless the shift registers 4, to 4n are cleared, the light emitting elements at new addresses will one after another light up in addition to those that started lighting up previously, and an addition display will be performed. After completing the keyboard input and confirming the address position, the circulation loop of shift registers 4, to 4n is cut off while the row code input to the comparator 5 and the column code input to the decoder 6 are cut off. 10 at the shift end
It is sufficient to apply more than one pulse. As described above, according to the present invention, only mxn lighting energizing lines are required for mxn light emitting elements, and addition display is possible.

The display device of the present invention can be applied to both keyboards using mechanical contacts and keyboards using light emitting elements in place of mechanical contacts.

FIG. 3 shows a keyboard with mechanical contacts condensed with the display device of the present invention.

In FIG. 3, 7 is a key matrix, KS, .
~KSmn is the key switch. 8 is a key encoder.

a light emitting element connected to each intersection of the light emitting element matrix 2;
For example, light emitting diodes are disposed inside or near each key switch corresponding to its address, and their light emission is visible from above the keyboard. The key encoder 8 sequentially outputs pulses P, S to P, and oS in a scanning manner to the pulse output terminals D, .about.Dm, and receives the pulses at the receiving terminals R, .about.Rn.

When the key switch KSij of the keyboard matrix 10 is closed, the key encoder 21 receives the pulse at the receiving end Ri when it outputs a pulse to the pulse output end Di. Therefore, the key encoder 21 determines that the key switch KSii is closed based on the addresses of the output end Dj that outputs the pulse and its receiving end Rj, and sends the code representing i to the row signal line SLX and the code representing j to the row signal line. Output to line SLY. At the same time, a one-pulse strobe signal is output to the strobe output terminal ST. line,
The code signals on the column signal lines SLX, SLY are held as they are until it is determined that another key switch KSi±x, i±y is closed. In this way, similarly to the embodiment shown in FIG. 1, the light-emitting element corresponding to the key KSij lights up, and when the key switch KSi±x, j and y is closed, the light-emitting element corresponding to it also lights up. I'll do it. By sequentially closing the keys in this manner, the light emitting elements at the respective positions are lit up one after another. Signal line S
The LX and SLY code signals are taken out as keyboard output. By clearing the shift registers 4, to 4n, all lights go out and the keyboard enters the standby state. FIG. 4 shows another example of a keyboard embodying the present invention.

In this embodiment, a ring counter 33 is used as the row scanner 3, and the clock pulse CL shown in FIG.
Oscillator OSC1 that generates OCK, ring counter 33,
The counter 3 and the encoder (1) 9 perform a function corresponding to the key encoder 8 in FIG. Like the decoder 32 (FIGS. 1 and 3), the ring counter 33 applies pulses P. to the row lines of the light emitting element matrix and the row lines of the key matrix 7 as shown in FIG. S-P. oS is given (however, 10=m). Therefore, the light emitting element is energized to light in the same way as in the embodiments shown in FIGS. 1 and 3.
Note that when the encoder 9 receives a pulse on any of the column lines of the key matrix 7, the encoder 9 selects the line number. Outputs a code signal representing . FIG. 5 shows still another example of a keyboard embodying the present invention.

This keyboard also uses a light emitting element as an input means. In FIG. 5, the clock pulse oscillator O
SC2 oscillates a pulse whose frequency is an integral number an times the clock pulse CLOCK shown in FIG. Counter 0 is a counter that changes to 0 after counting up to n-1 and starts counting from 0 again, and counts the output pulses of the oscillator OSC2. The output pulse of the oscillator OSC2 is
The frequency is divided by a frequency divider to a frequency of 1/an, and the resulting clock pulse CLOCK shown in FIG. 2 is applied to the counter 3 and shift registers 4, to 4n. Therefore, the operations of the row scanner 3 and shift registers 4, ~4n are as shown in Figure 1~
This is similar to the embodiment shown in FIG. Clock pulse oscillator O
The output pulse of SC2 is also applied to the ring counter 3, and the pulse signal at each output terminal of the ring force counter 13 is applied to each column line of the light emitting element matrix 2 through an OR gate.

The pulse period applied to each column line is P, ~P,o
1/an of the pulse width T^/m, that is, T^/man
is extremely short, and each column line has a pulse width of T^/m
During this period, it will be scanned a number of times. In other words, the row line P
Each column line receives a pulse when there is a pulse on i with a time width of T^/m. As a result, all the light-emitting elements are energized to light up and emit light with an extremely short width pulse. By appropriately setting the above integer a, the photoelectric detection element can detect the emitted light. The light emission may be dark, difficult to recognize, or invisible, and can be clearly distinguished from the lighting caused by the pulses P, S to P, and oS of the light emitting elements. The instruction means 14 has a built-in photoelectric conversion element that detects the above-mentioned full scanning light emission of the light emitting element, and when it detects the light emission of the light emitting element, it energizes the latch circuit 12 and outputs the output code of the counter 10 at that time. It is held and a strobe signal is output. Since the output code of the counter 3 changes (pulse period) every T^/m and is long, the row address can be read during that time. Note that a latch circuit may be similarly added at the subsequent stage of the counter 3. In this way, by reading the row address and column address based on the strobe signal, the position of the light emitting element on which the indicating means 14 is placed can be indicated by the code signal, and the row of the shift register 4i located at the column address can be displayed. A light emission energizing signal is stored at address i, so that the light emitting element located at position lii, that is, the light emitting element on which the indicating means 14 is placed, lights up brightly as in the embodiments of FIGS. 1 to 4. become. As described above, in this embodiment, the key matrix 7 provided with mechanical contacts is unnecessary, and unlike the conventional keyboard using a light emitting element and indicating means, addition display can be performed.

As explained in detail above, in the present invention, the light emitting element energizing lines are matrix wiring, so the number of wiring is small.
.

In addition, even though the number of wiring lines is small, the display can be maintained in the form of sequentially adding up the lighting display of the input address, so the input operation and its confirmation can be done quickly and easily. Further, according to the present invention, it is possible to set many key addresses by increasing the number of columns without changing the number of rows, and the brightness of lighting does not change even if the number of key addresses is increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a time chart showing signals of various parts in FIG.

3 to 5 are block diagrams showing a keyboard embodying the present invention. Note that the same reference numerals in the figures indicate the same or equivalent parts. 1: Wiring intersection, 2: Light emitting element matrix wiring, 3: Row scanner, 4, to 4n: Shift register, 5
: Comparator, 6: Decoder, 7: Key matrix, 8: Key encoder, 9: Encoder, 10: Counter, 11
: Frequency divider, 12: Latch circuit, 13: Ring counter,
14: Instruction means.

illustration ship Figure 2 figure M ship figure size ship figure Mountain ship

Claims (1)

[Claims] 1. A plurality of k light emitting elements in which at least one light emitting element is arranged corresponding to each key position, sequentially scanning pulse-energized light emitting elements determined by a pulse emission period T_V that is visible during repeated pulse lighting of these light emitting elements. When the maximum number is l, the plurality of light emitting elements are arranged in m rows where l≧m and k/
A light emitting element matrix wiring arranged in n columns where m≦n, a row scanner that emits a row line selection pulse with a period T_A where T_V≧T_A and whose phase is shifted from each other, and a row line selection pulse having at least m addresses. n storage devices that shift addresses synchronously and sequentially and each outputs a light emitting activation signal stored at a designated address for each column line; A display device for a multi-input keyboard, characterized in that a write address and a read address of the device are equal.