JPH0679199B2 - Character practice equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large number of 2 columns arranged in a matrix of m columns and n rows.
On the display unit consisting of color light emitting diodes, the information of the characters arbitrarily written with a predetermined light-sensitive pen is displayed as light emission on the display unit as it is, and the information such as the correct writing order and typeface of the characters is comparatively displayed. The present invention relates to a character practicing device configured so that it can be performed.

2. Description of the Related Art Generally, the conventional character practice device has been limited to paper such as printed matter or a blackboard.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The object of the present invention is that the configuration and operation are relatively simple, and the information of characters arbitrarily handwritten on the display unit is displayed on the display unit in the same typeface or form. To provide a character practicing device that can be displayed not only by light emission, but also by extracting character information stored in advance in the device so that the correct writing order, typeface or form of the character can be simultaneously displayed in different colors. It is in.

Means for Solving the Problems The character practice device of the present invention is arranged in a matrix of m columns and n rows, one electrode being a column direction bus bar of the column, and the other two electrodes being the first and first electrodes of the row. A plurality of two-color light emitting diodes each connected to two row-direction buses, a row-direction scanning circuit for sequentially supplying a column-selection address signal to the column-direction bus bar, and a row for the first row-direction bus bar. A first column-direction scanning circuit that sequentially supplies a selection address signal, and a light-emitting diode that moves on the display section in an arbitrary path and is weakly lit sequentially by the column selection address signal and the row selection address signal. A light-sensitive pen that selectively picks up light from the photoelectric conversion pen, an address information processing circuit that decodes and stores an address information signal from the light-sensitive pen, and an output signal of the address information processing circuit. A lighting state switching circuit for selectively displaying and lighting the light emitting diode under the movement locus of the light-sensitive pen based on the signal, and a shift register connected to the second row-direction busbar through a second column-direction scanning circuit. And a character information storage circuit connected to this shift register.

Operation With such a configuration, the display section also serves as a writing surface, and the trajectory of an arbitrary character drawn on the display section by the light sensitive pen is captured by the light sensitive pen as address information. Then, as a result of decoding and storing this address information and switching the light emitting diode to display lighting, the character can be displayed as it is on the display unit. In addition, various kinds of information stored in advance in the storage circuit can be selectively taken out and displayed on the display section in different colors so as to emit light.

EXAMPLES The present invention will be described in detail below with reference to the examples shown in the drawings.

First, the principle of operation in which one of the two-color light emitting diodes is used to cause the light pen to display characters on the display unit by light emission will be described.

64 units shown by address addresses 0,0 to 7,7 in FIG. 2 are arranged in a matrix of 8 columns and 8 rows, and each unit is a matrix of 64 light emitting diodes arranged in 8 columns and 8 rows. have. That is, it is a display unit in which 4096 light emitting diodes are arranged in a matrix of 64 columns and 64 rows, and an integrated circuit for controlling lighting of the light emitting diode group is provided on the back surface side of each unit.

All the light-emitting diodes forming the display section are weakly lighted one after another, and when the photosensitive pen moves on this display section in an arbitrary path, the address information of this moving track is successively output from the photosensitive pen. It will be sent out. Then, the display signal corresponding to this address information causes the light emitting diode under the orbit to turn on the display with high brightness, and this state is held.

FIG. 3 shows a typical circuit configuration for one unit. Here, the light-emitting diodes that are filled in with black are the ones for which the display is lit, so that the "na" character is emitted and displayed. The remaining light emitting diodes may continue to be weakly turned on, but can be completely turned off during display.

The anodes of the light emitting diodes D _0A , D _1A ... D _7A in the first column are connected to the transistor Tr ₁ via the column direction bus bar in the column. Also, the anodes of the second column below the light emitting diodes are also connected to each of the transistor Tr ₂ to Tr ₈ via the column bus of the column. The cathodes of the light-emitting diodes D _0A , D _0B, ... D _0H in the first row are connected to the transistor Tr ₉ via the row-direction bus bar in the row, and the cathodes of the light-emitting diodes in the second and subsequent rows are connected. Each transistor Tr ₁₀ via the row-direction bus bar of the row.
~ Connected to Tr ₁₆ .

The transistors Tr ₁ to Tr ₈ forming the row-direction scanning circuit are sequentially turned on one by one by the column selection address signal sent from the decoder IC _{0 in} time series, and are instantly turned on. This switching operation is repeated many times. Then, the anode potential of the light emitting diode connected to the turned-on transistor via the column-direction busbar becomes V _CC . The 3-bit signals A ₀ , B ₀ , C ₀ sent to the decoder IC ₀ are (a), (b),
This occurs at the timing shown in (c), and the column selection address signal with a duty of 1/8 is taken out from the decoder IC ₀ . Fourth
(D) and (e) of the figure show representatively the waveforms of the column selection address signals given to the transistors Tr ₁ and Tr ₈ .

On the other hand, the transistors Tr _{9 to} T of the column direction scanning circuit that selectively switch the cathode potential of the light emitting diode group to the ground potential.
Of r ₁₆ , for example, the transistor Tr _{9 in} the first row is
Since the column-direction address signal having a minute pulse width shown in (i) of the figure instantly turns on three times, the light emitting diodes D _{0A to} D _0H in the first row are sequentially synchronized with the column selection address signal. It will be faintly lit. However, in FIG.
The row selection address signal having a minute pulse width shown in (i) is a 3-bit address data signal A ₁₈ , B ₁₈ with different phases as shown in (f), (g) and (h) of FIG. Each of C ₁₈ is divided into 8 equal parts, and one is taken out from this, and the row selecting address signals for driving the transistors Tr _{9 to} Tr ₁₆ have different phases.

Therefore, it is possible to determine the address of the light emitting diode by detecting weak lighting of any light emitting diode on the display unit and detecting the address information signal obtained by photoelectrically converting the weak lighting.

However, among the three signals with minute pulse widths shown by three lines in one group in FIG. 4 (i), the first and second signals are
The third signal also plays a role in selecting row-direction addresses and column-direction addresses for a large number of units as shown in FIG. 2, and the third signal also plays a role in selecting row-direction addresses in the selected unit. . This signal is shown in Fig. 5.
It corresponds to the signal shown in (l), and in order to obtain this signal, the signals A ₂₇ , B ₂₇ , C ₂₇ , C ₁₈ shown in (b), (c), (d) and (h) of FIG. 5 are used. Is sent to the decoder IC ₂₇ , and the signals A ₁₈ , B ₁₈ and C ₁₈ shown in (a), (g) and (h) of FIG. 5 are sent to the NAND circuit IC ₁₈ , respectively.
Output signal of decoder IC ₂₇ and NAND circuit IC _{19 to} IC ₂₆ , IC
The output signal of ₃₆ is sent to the NAND circuit IC ₂₈ to IC ₃₅ . In addition, (e) and (f) of FIG. 5 are from the decoder IC ₂₇ to the NAND circuit I
A representative signal sent to C ₂₈ and IC ₃₅ .
One of these becomes the third signal.

One signal input terminal P of the NAND circuit IC ₃₆ is H at the time of writing.
It is kept at the level and at the time of display at the L level. The other signal input terminal Q is given a group address signal for selecting a row-direction address and a column-direction address for a number of units as shown in (i) of FIG. The group address signal having the waveform illustrated in (i) is for selecting the "0,1" unit in FIG.

The NAND circuit ICs _{19 to} IC ₂₆ have analog switch circuits IC ₂ to I.
The 8-bit shift register IC _{10 to} IC ₁₇ and the NAND circuit IC _{37 which} are switch-controlled by C ₉ are connected,
The shift clock signals shown in (j) of FIG. 5 are given to the shift registers IC _{10 to} IC ₁₇ . The terminal R is L level when forced off of the analog switch circuit IC ₂ ~IC _9, maintained at H level during normal operation, the analog switch circuit IC ₂ ~I
A data transfer signal shown in (k) of FIG. 5 and a signal from a data decoding circuit described later are given to the decoder IC ₁ which controls C ₉ .

The light-sensitive pen has a structure as shown in FIG. 6, for example, and has a light-sensitive element PH ₁ composed of a phototransistor or a photodiode at its tip. Photosensitive element P
Since the terminal of an H ₁ is drawn to the lead wire through the push switch S, only when pressed photosensitive element PH ₁ on the display surface of the display unit, the signal photoelectrically converted by the light sensitive element PH ₁ is It will be taken out to the lead wire. Another photo-sensitive element PH ₂ provided in the pen's abdominal window is
In order to switch between the normal operation state when the normal display is turned on and the forced turn-off state when the once turned on is forcibly turned off, the switch element connected to the terminal R in FIG. Covering the surface with your fingertips puts it into normal operation.

All the light-receiving diodes at the time of writing light up weakly one by one, but one unit, for example, the unit "0,
1 ”, of the three address signals ((l) in FIG. 5) given to each of the transistors Tr _{9 to} Tr ₁₆ , the first and second signals are common to the unit“ 0, 1 ”. It has the same phase, and only the third signal has a different phase for the eight transistors Tr _{9 to} Tr ₁₆ ,
The address of the row is detected by this phase difference.

For writing operation, it suffices to write arbitrary characters or figures while pressing the tip of the photosensitive pen on the transparent filter plate that uniformly covers all the light emitting diodes of the display section. At the moment when the tip of the photosensitive pen is on the light emitting diode D _0E , for example, the first, second and third signals are taken out as a pulse train, which is supplied to the data decoding circuit shown in FIG.

The data decoding circuit is composed of OR circuits IC _{38 to} IC ₄₀ , binary counter circuits IC _{46 to} IC ₄₈ connected to the oscillator, flip-flop circuit IC ₄₉ connected thereto, and decoder ICs ₄₄ and IC.
₄₅ and 4-bit latch circuits IC _{41 to} IC ₄₃ are provided. Then, the signals A ₁₈ , B ₁₈ and C extracted from the photoelectric conversion element PH _{1 are} output.
_Since the signals A ₂₇ , B ₂₇ , C ₂₇ are latched by the signals separated at ₁₈ , the row and column group address signals are taken out from the decoders IC ₄₄ , IC ₄₅ . Further, write address signals A ₁ , B ₁ , C ₁ for lighting the display are taken out from the latch circuit IC ₄₁ . On the other hand, flip-flop circuit
The data transfer signal taken out from the IC ₄₉ is used to determine the time when the row direction scanning transistors Tr _{1 to} Tr ₈ enter the ON state from the time when the latch signal is generated.

When these signals are given to the decoder of the circuit shown in FIG. 3, the analog switch circuit IC ₂ sends to the shift register IC ₁₀ signals (lighting = H, lightning = L) designating whether to light or not to light. However, the time of this sending is the fifth
It is synchronized with the shift clock signal as shown in (k) and (j) of the figure. When the write address signal as described above is given to the decoder IC ₁ , the shift register IC ₁₀ stores that the light emitting diode D _0E is H during the period when the transistor Tr ₅ is on, and this memory is stored. The input / output relationship of the latch circuit is maintained even after it is restored.

After displaying characters and figures in this way,
When the terminal P in FIG. 3 is switched to the L level, the remaining light emitting diodes that have continued weak lighting are completely turned off, and the contrast of the light emitting display is enhanced. Also, if you hold a light sensitive pen without covering the window of the pen belly with your fingertips and press the tip of the pen against any one light emitting diode that is lit, the terminal R in FIG. 3 will shift to L level. Since the light emitting diode is forcibly turned off, it is possible to partially correct the light emitting character or figure.

Note that FIG. 8 is a signal waveform diagram of each part when the character "NA" is displayed by light emission in the above-mentioned device.

In the device of the present invention, as shown in FIG. 1, a two-color light emitting diode is used for each of a large number of light emitting diodes constituting the display section. The two-color light emitting diode is one in which two light emitting diodes having different emission colors are housed in a single package shown by a broken line in the figure, and both anodes are commonly connected. The light emitting diodes D _{0A to} D _7H are for red light emission, and the accessory circuits and operating principles thereof are as described above.

Light emitting diode L _0A paired with light emitting diode D _{0A to} D _7H
~L _7H intended for green light emission, respective anode are commonly connected to the anode of the red light-emitting diode of the column as described above, the cathode is connected to the second row bus in the row. These second row-direction buses are connected to the shift registers IC _{50 to} IC ₅₇ via the transistors Tr ₁₇ to Tr ₂₄ that form the second column-direction scanning circuit, and are connected to the shift registers IC _{50 to} IC ₅₇ . A character information storage circuit M is connected.

The character information storage circuit M stores various character information in advance, and the character information extracted by the selection by the keyboard K is stored in the shift registers IC _{50 to} IC ₅₇ and synchronized with the operation of the decoder IC _0. When the shift clock signal is applied, the transistors Tr _{17 to} Tr _{24 of} the second column direction scanning circuit are added.
Switch operation. The light emitting diodes L _{0A to} L _7A do not light up and the selected character information is displayed in green. That is, if the selected character information is, for example, the character "NA", green light emission is displayed so that the first stroke to the fourth stroke are sequentially added in a cycle of about 1 second.

In this way, the correct writing order of the letters “na” and the typeface are lit in green, and this letter is erased once, and this time the operator uses the light pen to display the letters “na” on the same display. write. Then, by displaying this character in red light emission as described above and again displaying the model character "na" in green light emission, it is possible to practice the correct writing of the character by comparing them.

Either one of the model character and the written character may be displayed in a blinking manner (flash), or the first image of the model character may be displayed in flash and the handwriting is completed when the first image is finished writing with the light pen. It may be an embodiment in which the second stroke of this character is flash-displayed. Also, by determining the degree of coincidence between the character written with the it pen and the model character, the accuracy is indicated by ○, △, ×. It can also be displayed.

Effect of the Invention Since the character practice device of the present invention is configured as described above,
Not only the characters that follow the trajectory of the light-sensitive pen that ran on the display unit in an arbitrary trajectory are displayed on the display unit as they are, but also model characters in different emission colors are combined on the same display unit. It can be displayed and you can practice writing the characters efficiently in an interactive manner.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a display unit and a character information storage unit of a character practice device embodying the present invention, FIG. 2 is a plan view showing an arrangement state of all units of the device, and FIG. 3 is a display unit of the device. 4 is a circuit diagram of a part of the information storage unit, FIGS. 4 (a) to (i), and FIGS. 5 (a) to (l) are waveform diagrams of signals in each part of the device, and FIG. 6 is the same. FIG. 7 is a side sectional view of a light-sensitive pen of the device, FIG. 7 is a circuit diagram of a data decoding section of the device, and FIG. 8 is an on / off state of a transistor group when the device displays the “na” character by light emission. 5 is a signal waveform diagram for explaining FIG. D _{0A to} D _7H , L _{0A to} L _7H ... Light emitting diode, Tr _{1 to} Tr ₂₄ ...
… Transistor, IC ₀ …… Decoder, IC _{2 to} IC ₉ …… Analog switch circuit, IC _{10 to} IC ₁₇ , IC _{50 to} IC ₅₇ …… Shift register, IC _{19 to} IC ₂₆ …… NAND circuit, IC ₂₇ …… Decoder, IC _{28 to} IC ₃₅ …… NAND circuit, IC ₃₆ , IC ₃₇ …… NAND circuit.

Claims (1)

[Claims] 1. A plurality of columns arranged in a matrix of m columns and n rows, one electrode connected to a column-direction bus bar of the column and the other two electrodes connected to first and second row-direction bus lines of the row, respectively. A display unit including a two-color light emitting diode, a row-direction scanning circuit that sequentially supplies a column-selection address signal to the column-direction busbar, and a first row-direction scanning circuit that sequentially supplies a row-selection address signal to the first row-direction busbar. The column direction scanning circuit and the display section are moved along an arbitrary path to selectively pick up the light from the light emitting diodes which are weakly illuminated sequentially by the column selection address signal and the row selection address signal and photoelectrically convert the light. A light-sensitive pen, an address information processing circuit that decodes and stores an address information signal from the light-sensitive pen, and a movement locus of the light-sensitive pen based on an output signal of the address information processing circuit. A lighting state switching circuit for selectively displaying and lighting the light emitting diodes, a shift register connected to the second row direction bus bar through a second column direction scanning circuit, and character information storage connected to the shift register A character practice device characterized by comprising a circuit.