JPH0799464B2 - Information display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information display device configured to display a graphic or the like on a display unit including a large number of light emitting diodes arranged in a matrix of m columns and n rows. .

2. Description of the Related Art There are various types of information display devices, but a method in which information input by a keyboard or the like is temporarily stored and converted into a uniform typeface or form by a character generator or the like for display. The ones occupy the mainstream.

Therefore, not only is the configuration and scanning complicated,
The information content cannot be displayed in a unique typeface, making it difficult to establish a unique publicity medium.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is that the configuration and operation are relatively simple, and that information such as characters or figures arbitrarily handwritten on the display unit is displayed in the same typeface or form. An object of the present invention is to provide an information display device capable of emitting light on the display unit.

Means for Solving Problems The information display device of the present invention is arranged in a matrix of m columns and n rows, and one electrode is connected to a column direction bus bar of the column and the other electrode is connected to a row direction bus bar of the row. A display section including a plurality of light emitting diodes, a row-direction scanning circuit that sequentially supplies a column-selection address signal to the column-direction bus bar, and a column-direction scanning circuit that sequentially supplies a row-selection address signal to the row-direction bus bar. A photosensitive pen that selectively travels on the display unit and selectively picks up light from the light emitting diodes that are weakly illuminated sequentially by the column selection address signal and the row selection address signal, and photoelectrically converts the light. An address information processing circuit for processing the column selection address signal and the row selection address signal from the light sensitive pen and the light emitting diode are switched from weak lighting to display lighting. And a light emitting diode lighting state switching circuit for switching, the address information processing circuit and the light emitting diode lighting state switching circuit are configured in units of units, and the address information processing circuit includes columns and rows of units, and A data decoding circuit for decoding the column selecting address signal and the row selecting address signal of each of the columns and rows of the light emitting diodes in the unit, wherein the light emitting diode lighting state switching circuit is By inputting the signal of 1 to the light emitting diode lighting state switching circuit, a selection circuit for selectively lighting the light emitting diodes corresponding to the column and row addresses stored in the storage circuit of the light emitting diode lighting state switching circuit is provided. Having the columns included in the light due to weak points of the light emitting diode Picked 択用 address signal and the row select address signal by the light-sensitive pen is a light emitting diode of the movement under the light sensitive pen which selectively display lighting.

Action With such a configuration, the display section also serves as the writing surface, and the trajectory of any character or figure drawn on the display section by the light-sensitive pen can be captured by the light-sensitive pen as address information. Become. Then, as a result of decoding and storing this address information and switching the light emitting diode to display lighting, it is possible to cause the above-mentioned characters or figures to be directly displayed on the display unit as light emission, and to provide a convenient message transmission means or a unique advertising medium. You can

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

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 sequentially emit weak light, and when the light-sensitive pen moves on this display section in an arbitrary path, the address information of this moving path is sequentially sent out from the light-sensitive pen. Going away. Then, the display signal corresponding to the address information causes the light emitting diode under the orbit to turn on the display with high brightness, and this state is held.

FIG. 1 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 respective anodes of the light emitting diodes D _0A , D _1A ... D _7A in the first column are connected to the transistor Tr ₄ 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 IC0 in a time series, and are instantly turned on. The switch 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 shown in FIG.
It occurs at the timing shown in (b) and (c), and the decoder IC
A column selection address signal with a duty of 1/8 is taken out from ₀ . (D) and (e) of FIG. 3 show transistors Tr ₁ and Tr ₈
The waveform of the column selection address signal applied to the column is representatively shown.

On the other hand, an example of selectively switching the cathode potential of the light emitting diode group to the ground potential Transistors Tr _{9 to} T of the direction scanning circuit
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 FIG. 9 instantly turns on three times, the light emitting diodes D _{0A to} D _0H in the first row are sequentially sequentially synchronized with the column selection address signal. It will be faintly lit. However, the row selecting address signal of the minute pulse width shown in (i) of FIG.
As shown in (f), (g), and (h) of FIG. 3, each of the 3-bit address data signals A ₁₈ , B ₁₈ , and C _{18 having} different phases is divided into eight equal parts and taken out one by one. Things
Row select address signal for driving the transistor Tr ₉ to Tr ₁₆ has a different phase.

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. 3 (i), the first and second signals are the row directions for many units as shown in FIG. The third signal also plays a role of selecting an address and a column-direction address, respectively, and the third signal also plays a role of selecting a row-direction address in the selected unit. This signal is the 4th
It corresponds to the signal shown in (l) of the figure, and to obtain this signal,
Signal A shown in (b), (c), (d) and (h) of FIG.
₂₇ , B ₂₇ , C ₂₇ , C ₁₈ are applied to the decoder IC ₂₇ , and signals A ₁₈ , B ₁₈ , C ₁₈ shown in (a), (g) and (h) of FIG. 4 are NAND.
The output signal of the decoder IC _{27 and} the output signals of the NAND circuits IC _{19 to} IC ₂₆ and IC ₃₆ are sent to the circuit IC ₁₈ and to the NAND circuits IC _{28 to} IC ₃₅ , respectively. In addition, (e) of FIG.
(F) shows representatively the signals sent from the decoder IC ₂₇ to the NAND circuits IC ₂₈ , IC _35, and one of these is the third signal.

The NAND circuit IC ₃₆ and the signal input terminal P on one side are H during writing.
It is kept at the level and at the time of display at the L level. The other signal input terminal Q is supplied with a group address signal for selecting a row-direction address and a column-direction address for a large number of units as shown in 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. 4 are given to the shift registers IC _{10 to} IC ₁₇ . The terminal R of the analog switch circuit IC ₂ ~IC ₉ is L level when forced off, kept at H level during normal operation, the analog switch circuit IC ₂
The data transfer signal shown in (k) of FIG. 4 and a signal from a data decoding circuit described later are given to the decoder IC ₁ which controls IC ₉ to IC ₉ .

The light-sensitive pen is configured, for example, as shown in FIG. 5, 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 H ₁ is pulled out to the lead wire via the push switch S, the signal photoelectrically converted by the light sensitive element PH ₁ is pulled out only when the light sensitive element PH ₁ is pressed against the display surface of the display section. It will be taken out to the conductor. The other photosensitive element PH ₂ provided in the window of the abdomen of the pen switches between the normal operation state when the normal display is turned on and the forced off state when the once turned on is forcibly turned off. Therefore, if the light receiving surface of the switch element connected to the terminal R in FIG. 1 is covered with a fingertip, a normal operation state is set.

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 ”, among the three address signals ((l) in FIG. 4) given to each of the transistors Tr _{9 to} Tr ₁₆ , the first and second signals are common to the unit“ 0, 1 ”. are of the same phase, only the third signal becomes a different phase with respect to eight transistors Tr ₉ to Tr _16, the address of the row is detected by the phase difference.

The writing operation may be performed by simply drawing an arbitrary character or figure 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 light-sensitive pen is located 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. 1, the analog switch circuit IC ₂ sends to the shift register IC ₁₀ a signal (lighting = H, lightning = L) designating whether to turn on or off. However, the time of this sending is the 4th
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. It is connected even after the input / output relation of the latch circuit is restored.

After displaying characters and figures in this way,
When the terminal P in FIG. 1 is switched to the L level, the remaining light emitting diodes that have continued to be weakly turned off are completely turned off, and the contrast of the light emission display is enhanced. Further, when the light sensitive pen is held without covering the window of the pen abdomen with the fingertip and the tip of the pen is pressed against any one of the light emitting diodes which are lit, the terminal R in FIG. 1 shifts to the L level, Since the light emitting diode is forcibly turned off, it is possible to partially correct the light emitting character or figure.

FIG. 7 shows the on / off state of the transistor group when the letter “na” is displayed by light emission.

Effects of the Invention Since the information display device of the present invention is configured as described above,
Characters and figures that follow the trajectory of the light-sensitive pen that runs on the display in an arbitrary trajectory are displayed on the display as they are, and in particular the display also serves as the writing surface.
It has a structure in which a faithful image reproduction effect can be obtained, information can be easily input without using an independent writer such as a keyboard, and the address decoding result can be stored and displayed in unit. Therefore, there is an advantage that the size of the display portion can be freely selected.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a display section and an information storage section of an information display apparatus embodying the present invention, FIG. 2 is a plan view showing an arrangement state of all units of the apparatus, and FIGS. ), And (a) to (l) of FIG. 4 are waveform diagrams of signals in respective parts of the device, FIG. 5 is a side sectional view of a photosensitive pen of the device, and FIG.
FIG. 7 is a circuit diagram of the data decoding section of the same device, and FIG. 7 is a signal waveform diagram for explaining the on / off state of the transistor group when the device displays the letter "na". D _{0A to} D _7H ...... Light emitting diode, Tr ₁ to ₁₆ ...... Transistor, IC ₀ ...... Decoder, IC _{2 to} IC ₉ ...... Analog switch circuit, IC _{10 to} IC ₁₇ ...... Shift transistor, IC ₁₈ ...... NA
ND circuit, 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 display unit comprising a plurality of light emitting diodes arranged in a matrix of m columns and n rows, one electrode being connected to a column direction bus bar of the column and the other electrode being connected to a row direction bus line of the row, respectively. A row-direction scanning circuit that sequentially supplies a column-selection address signal to the column-direction bus bar; and a column-direction scanning circuit that sequentially supplies a row-selection address signal to the row-direction bus bar,
A light-sensitive pen that moves on the display unit in an arbitrary path and selectively picks up light from the light-emitting diodes that are weakly illuminated sequentially by the column selection address signal and the row selection address signal and photoelectrically converts the light; The address information processing circuit for processing the column selection address signal and the row selection address signal from the light sensitive pen, and a light emitting diode lighting state switching circuit for switching the light emitting diode from weak lighting to display lighting are provided. The information processing circuit and the light emitting diode lighting state switching circuit are configured in units of units, and the address information processing circuit includes the columns and rows of units, and the columns and rows of the light emitting diodes in the unit. Data decoding circuit for decoding column selection address signal and row selection address signal The light emitting diode lighting state switching circuit has a column and a row stored in the storage circuit of the light emitting diode lighting state switching circuit by inputting a signal from the data decoding circuit to the light emitting diode lighting state switching circuit. A selection circuit for selectively lighting the light emitting diodes corresponding to the address of, and the column selection address signal and the row selection address signal included in the light due to the weak lighting of the light emitting diodes by the light sensitive pen. An information display device characterized by picking up and selectively lighting the light emitting diode under the movement of the light sensitive pen.