JPH0454522A - Display board device - Google Patents

Abstract

PURPOSE:To simultaneously display the characters and graphics on a display board and an external display device and also to display the characters and graphics as necessary by detecting the coordinates on the display board and outputting the data to the outside by means of an optical pen. CONSTITUTION:The counter electrodes 70a - 70d are formed independently of each other along the upper-lower and right-left fringes of a front board 11. Then the currents Ia - Id flowing to the electrodes 70a - 70d are detected at a coordinate detection part 82. Based on these detection values, the coordinates of a point P where a recording optical pen 65 touches the board 11 are calculated. This arithmetic result is supplied to an external display device and a memory device. Thus the characters and the graphics to be drawn on a display board device are drawn in real time on the external display device or stored once in an external memory and then can be displayed on the external device as necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a display board device used as an electrical blackboard device, an electrical message board device, etc.
In particular, it uses an optical pen, detects the coordinates on the display board, and outputs the data to the outside.

``Prior Art J'' As a conventional display board device, one described in Japanese Patent Application No. 326523/1983, which has already been proposed by one of the inventors, will be described.

The conventional display board device has a display board 10, four pillars 21, 22, 23 as shown in FIG.
, 24, circuit section 30, power plug 40, IT pen 50
and an electric matsutoro 0 for erasing.

The display board 10 is of an electrochromic display configuration with a special front board 11.
As shown in FIG. 9, the front board 11 includes a transparent insulating substrate 11 such as a transparent plastic substrate or a transparent glass substrate.
In the transparent insulating substrate 11i, a large number of embedded electrodes 9 such as fine ITO electrodes are arranged in the surface direction of the transparent insulating substrate 111 at a fine pitch of, for example, about IO pieces per square millimeter or more. Penetrate in the thickness direction,
Each of these electrodes is embedded as a display electrode.

The display board IO has a frame 12 that also serves as a spacer.
The above-mentioned front board 11 is attached to one side, and the rear board 13 is attached to the opposite side.
A counter electrode 14 is formed on the surface facing the front board 11 of the counter electrode 14 , a counter electrode layer 15 such as an iridium oxide layer is formed on the surface of the counter electrode 14 facing the front board 11 , and a counter electrode layer 15 such as an iridium oxide layer is formed between the front board 11 and the counter electrode layer 15 . colored layer 16 and electrolyte solution 17
An electrochromic material 18 consisting of is interposed therebetween, and the counter electrode 14 is grounded.

A tungsten oxide layer is formed in close contact with the back surface of the front board 11 as the colored layer 16 with a thickness of about 5,000, and as the electrolyte solution 17, for example, a lithium perchlorate/propylene carbonate solution is sealed.

The pillars 21 to 24 and the circuit section 30 are attached to the lower side of the display board 10. The power plug 40 is connected to a commercial AC power outlet, and has a cord 44.
It is connected to the circuit section 30 by.

As shown in FIG. 11, the circuit section 30 includes a counter electrode 14.
A voltage source 35 that provides a negative voltage -Eo with respect to a negative potential with respect to the ground potential, and a voltage source E that is positive with respect to the ground potential.
A voltage source 36 is provided from which m is obtained. The voltage -EO is set to about -2v to -IV, and the voltage element Em is set to +2v to +1V.
be reduced to a certain degree.

The electric pen 50 includes a rod-shaped conductor 52 embedded in a cylindrical insulator 51 with its tip exposed from one end of the insulator 51, and a variable resistor 53 provided at the other end of the insulator 51. , the conductor 52 is a variable resistor 53 as shown in FIG.
The variable resistor 53 is configured to be connected to the regulator 53a of
Both ends of the voltage source 35 are connected to both ends of the voltage source 35 of the circuit section 30 by a cord 54. Therefore, a negative voltage -EP is applied to the conductor 52 with respect to the counter electrode 14 of the display board 10.

, the erasing electric matsutoro 0 is, as shown in FIG. 1O,
A plate-shaped conductor 62 is attached to one side of a plate-shaped insulator 61, and a handle 63 is attached to the other side of the insulator 61. As shown in FIG.
64 is connected to the positive side of the above-mentioned voltage source 36 of the circuit section 30. Therefore, a positive voltage element Em is applied to the conductor 62 with respect to the counter electrode 14 of the display board 10.

In the display board device described above, the electric pen 5
0 in your hand and bring its conductor 52 into contact with the transparent electrode 11c of the front board 11, a voltage -Ep is applied between the embedded electrode 9 and the counter electrode 14 at the point of contact, and the At the point of contact, the tungsten oxide of the colored layer 16 is reduced and colored blue.

Since the electrochromic material 18 described above has memory properties, once the colored substance is colored in this way, that state is maintained for a long time. Therefore, by scanning the front board 11 with the electric pen 50 while the conductor 52 is in contact with the front board 11, characters, pictures, etc. are displayed on the display board 10.

In the second case, the regulator 53 of the variable resistor 53 of the electric pen 50
By adjusting a and changing the voltage EP applied to the conductor 52, that is, the voltage applied to the embedded electrode 9, the displayed color tone can be changed. Furthermore, since the display board IO has an electrochromic display configuration, a clear and easy-to-see display that is independent of viewing angle can be obtained. Moreover, since a special electric pen 50 is used, the pen does not wear out or emit any odor.

With characters, pictures, etc. displayed on the display board 10 in this way, hold the erasing electric matsuro 0 in your hand and bring its conductor 62 into contact with the embedded electrode 9 at the colored point on the display board 10. A voltage +E is applied between the embedded electrode 9 and the counter electrode 14 at the point of contact.
m is applied, and the reduced tungsten oxide is re-oxidized and decolorized at the contact point.

Therefore, by scanning the front board 11 with the electric eraser 0 while pressing the conductor 62 against the front board 11, characters, pictures, etc. displayed on the display board 10 are erased. In this case, since a special erasing electric mat tray 0 is used, the erasing mat is not worn out and no dust is generated.

In the example described above, the display board 10 has a cell structure as shown in FIG. 9 in which tungsten oxide, for example, is used as the colored layer 16, and a negative voltage -EP is applied to the buried electrode 9 with respect to the counter electrode 14. By this, the colored layer 16 is reduced and colored, and by applying a positive voltage element Em to the embedded electrode 9 and the counter electrode 14, the colored layer
6 is oxidized and decolored, but conversely, as the electrochromic material 18 of the display board 10, a material in which the colored layer 16 is colored by oxidation and decolored by reduction is used, and the conductor 52 of the electric pen 50 is It is also possible to apply a positive voltage to the counter electrode 14 and apply a negative voltage to the conductor 62 of the erasing electric maturo 0 with respect to the counter electrode 14.

Further, as the electrochromic material 18 of the display board 10, a material such as a special organic material that changes color depending on the magnitude of the applied voltage is used, and the electric pen 5
The displayed color can also be changed by changing the voltage applied to the zero conductor 52.

``Problem to be solved by the invention'' Conventional electrochromic and display board devices only had the function of displaying characters, figures, etc. on the board with an electric pen, and could not output the image information externally. . Lately, I've been wanting to display characters and figures using a pen on the board and simultaneously display them on an external display device, or to temporarily store them in an external storage device and display them externally when needed. A new request has been made.

This invention attempts to meet these new needs.

"Means for Solving the Problems" (1) The present invention is a display board device comprising a display board, a recording optical pen, an erasing optical pen, and a coordinate detection section.

The display board is an electrochromic display in which a front board and a rear board are arranged facing each other, and an electrochromic material is interposed between them.

In the rear board, a large number of small embedded electrodes are arranged in a matrix in a transparent insulating substrate, and embedded through the thickness direction of the transparent insulating substrate. The collectors of the transistors are commonly connected, the light-receiving surfaces of the first and second phototransistors face the transparent insulating substrate, and first and second optical filters having different transmission wavelengths are interposed between them, respectively. It is.

The front board has a transparent resistive film formed on the surface of the transparent insulating substrate facing the rear board, and a pair of opposing electrodes made of elongated strip-shaped conductive films are arranged on the upper and lower and left and right edges of the resistive film. They are formed parallel to each other.

The optical recording pen has a light emitting element and can emit light of a wavelength that passes through the first filter from the tip of the pen, and scans the front board with the tip of the pen to emit the light. The current enters the first phototransistor through the first optical filter, turns on the transistor, and passes the current from the resistive film in front of the buried electrode through the electrochromic material to the buried electrode connected to its collector. , and the scanning locus of the pen is displayed on the display board.

The optical erasing pen has a light emitting element and can emit light of a wavelength that passes through the second filter from the tip of the pen, and scans the front board with the tip of the pen to emit the light. The current enters the second phototransistor through the second optical filter, turns on the transistor, and causes a current to flow in the opposite direction to that during recording through the buried electrode connected to its collector, thereby recording the upper rudder. This is to erase the scanning trajectory of the optical pen.

The coordinate detection unit detects a current flowing between the collector of the first phototransistor and each of the counter electrodes, and calculates the coordinates of the tip of the recording optical pen on the front board from the detected values, The calculated value is output to the outside.

(2) In the above item (1), there is also a display board device in which the resistive film formed on the surface of the front board facing the rear board is deleted, and the counter electrode is formed directly on the edge of the front board. It is valid.

``Embodiment'' In this invention, while drawing characters, figures, etc. on the display board with an optical pen, the coordinates of the optical pen on the display board at that moment are detected, and the detected values are supplied to the outside to display the coordinates in real time. Characters and figures can be displayed externally or temporarily stored externally so that they can be displayed when necessary.

Embodiments of the present invention are shown in FIGS. 1 to 5, and parts corresponding to those in FIGS. 8 and 9 are denoted by the same reference numerals, and redundant explanation will be omitted.

In this invention, instead of the conventional electric pen 50 and the electric erasing pen 0, there are provided an optical recording pen 65 and an electric erasing pen 66 (FIG. 2), respectively, which have light emitting elements and can emit light of different wavelengths. used. In addition, the conventional rear board 13 is made of a transparent insulating substrate and serves as a front board, the front surface of which is scanned by the optical pen.

In addition, conventionally, the counter electrode 14 and the counter electrode layer 15 formed on the surface thereof (hereinafter, both are collectively referred to as the counter electrode 70) were formed on the entire surface of the rear board 13, but in the present invention, In order to detect the coordinate position of the pen, the front board 1
A pair of elongated strip-shaped counter electrodes 7 are provided on the upper and lower and left and right edges of 1.
0a, 70b and 70c, 70d are formed facing each other in parallel (FIG. 4).

Further, the conventional front board 11 side is used as the rear board 13, and the collectors of a pair of chip-type first and second phototransistors 71 and 72 that are complementary to each other are connected to each embedded electrode 9 of the rear board 13 (the first figure).

The light-receiving surfaces of the first and second phototransistors 71 and 72 face the rear board 13, and on the rear board 13, which faces the light-receiving surfaces, there are provided first and second optical filters (for example, made of glass) having different transmission wavelengths. ) 73 and 74 are formed respectively.

The light scanned on the front board 11 by the recording optical pen 65 is transmitted to the electrochromic material 18 and the rear board 13.
Transparent. Since the light beam has a certain spread (area), it is selected by a plurality of first optical filters 73, and the corresponding plurality of first phototransistors 71 are turned on and connected to their collector electrodes 71a. Current flows into the plurality of embedded electrodes 9. In the same manner as described in the conventional example, a current flows between the embedded electrode 9 and the counter electrode 70 via the electrochromic material 18, the colored layer 16 is colored, and the scanning locus of the recording optical pen 65, In other words, characters, figures, etc. are displayed.

Erasing these characters, figures, etc. is performed by scanning the characters and figures displayed on the board with the tip of the erasing optical pen 66. Those lights are filtered through the second optical filter 7
4, the plurality of second phototransistors 2 are turned on, and the buried electrodes 9 are connected to their collectors.
Then, a voltage with a polarity opposite to that during recording is applied, so that a current flows between the buried electrode 9 and the counter electrode 70 in the opposite direction to that during recording, and the colored layer 16 is decolored.

On the back surface of the rear board 13, as shown in FIG.
, second optical filters 73 and 74 are formed by vapor deposition, printing, or the like. A first emitter bus 75 made of a conductive film is formed linearly along and near the filters in each row, and the width of the portion of the first emitter bus 75 facing the first optical filter 73 is expanded in the direction of the filter. This forms a pattern 75a for soldering to the emitter electrode 71b of the first phototransistor. Also, the first Emitsutaba 7
A linear second emitter bus 76 adjacent to and parallel to 5.
is formed near the buried electrode 9, and the second emitter bus 76
A pattern 76a for soldering to the emitter electrode 71b of the second phototransistor is protrudingly provided on the side edge facing the second optical filter 74.

As shown in FIG. 1, a chip-type first phototransistor 71 is disposed on a first optical filter 73, and its collector electrode 71a and emitter electrode 71b are connected to a corresponding embedded electrode 9 and a soldering pattern in the vicinity. 75a, respectively.

Further, a chip-type second phototransistor 72 (complementary to the first phototransistor 71) is disposed on each second optical filter 74, and its collector electrode 72a and emitter electrode 72b are connected to the nearby buried electrode 72. and soldering pattern 76a, respectively. In addition,
The light receiving surfaces of the first and second phototransistors 71.72 are in contact with the first and second optical filters 73.74, respectively.

Front board 1 made of a transparent insulating substrate as shown in Figure 4
A transparent resistive film 81 is uniformly formed on the surface facing the rear board 13 of 1, and a pair of elongated strip-shaped counter electrodes 70a, 70b, 70c, and 70d are opposed and parallel to each other on the upper and lower and left and right edges of the resistive film 81. It is formed. The unit resistance of the resistive film 81 is chosen to be much smaller than the unit resistance of the electrochromic material. As shown in FIG.
0a to 70b each have a low resistance value resistor ra+rk+
One end of rc+r- is connected, and the other end of each resistor is connected to a common potential point. The resistance value of these resistors is the resistance film 81
The resistance value is made sufficiently small compared to the resistance value of . Recording optical pen 6
If the point on the resistive film 81 through which the light beam passes is P' (on the other hand, the point of contact on the board at the tip of the pen 65 is P), then the plurality of first photos turned on by the light beam are Toward the buried electrode 9 connected to the collector electrode 71a of the transistor 71 (its voltage is -Eo),
From the common potential point (earth), resistor r, ~r4, counter electrode 70
A current flows through a to 70d, resistor H81, and electrochromic material 18.

That is, the current passes from the counter electrodes 70a to 70d, passes through the resistive film 81, collects at and near point P' on the resistive film 81, penetrates the electrochromic material 18 perpendicularly, and reaches the buried electrode 9 p1. Point and counter electrode 70a, 70b, 70
Let the shortest distances to c and 70d be f, , fk, L, and f, respectively.
, and the currents flowing through their opposite electrodes are I- and I, respectively.
It is expressed as b, IC, and Im.

Since the thickness of the electrochromic material 18 is small, the resistance to the current flowing through it can be ignored compared to the resistance of the resistive film 81, and the resistance R-, Rh of the resistive film 81 to the current 1-, Ih. is the above distance II ti
-, t; < b is proportional to \, so 1, I1. =
R, /R,=ffib I1. , (1).

tt −+ ti b = r−+
If you put (2), you get distance! , is (1), (2
) From the formula.

It is expressed as Similarly, the resistance film 81 for the current 1c, I
If the resistances Rc and R are Ic/I,=Ra/Rc=CI1. c (4).

fe +L mi L2 If you put it, distance! 114 is I4゜ It is expressed as

In the coordinate detection section 82 in FIG. 5, resistors ra to ra
(The common resistance value is r) voltage at each terminal ■1 to v
4, and from the relationship, the current flowing through each resistor is 1. ~1□ is detected, and from equations (3) and (6) above, the instantaneous coordinates of the point P on the board at the tip of the optical recording pen 65 (-equal to the coordinates of the point P' on the conductive film 81) ) (tit, 1.
) and supply the coordinate data to the outside in real time.

In the above, the coordinates U1. ．． 1. ＞, but the coordinates (I!., I!h), (j!c,
j! , ) or (f, , itb). Alternatively, XY coordinate axes may be set on the front board 11 and the (x, y) coordinates thereof may be determined.

An example of the electrical equivalent circuit of the display board IO described above is shown in FIG. It is given.

In the above description, the resistive film 81 on the back surface of the front board 11 may be omitted, and the counter electrodes 70a to 70d may be formed directly on the back surface of the front board 11. In this case, the current 1-"I4 that was flowing through the resistive membrane 81 flows through the electrolyte solution 17 and along the board 11.13 as shown in 6rj!J. The resistance of the electrochromic material to those currents (equal to the resistance of the electrolyte solution 17) as R1゜Rh, Rc, R, respectively, the above (1) ~ (
7) The formula holds true as is.

In the explanation so far, in order to detect the current flowing through the counter electrodes 70a to 70d, resistors R, . . .
Although the present invention is not limited to this, for example, the input terminal of an operational amplifier (with a negative feedback resistor) having an extremely low input resistance with respect to the ground is connected to each opposite electrode, It is also possible to detect the current flowing to the opposite electrode from the output current.

In the explanation so far, it has been assumed that chip-type phototransistors are soldered to the back surface of the rear board 13 in FIG. good.

Note that the display board device of the present invention can be used as an electrical blackboard device, an electrical message board device, etc., but regardless of the use, the support 2
The display board 10 may be attached to a wall or the like without providing the elements 1 to 24 and the like.

Furthermore, the display board device of the present invention can be miniaturized and used as a coordinate input device for personal computers, word processors, and the like.

"Effects of the Invention" According to this invention, the counter electrodes 70a to 70d are connected to the front board 1.
The coordinate detection unit 82 detects the currents 1 to 2 formed independently along the upper, lower, left, and right edges of 1, and the currents 1 to 2 flowing through each counter electrode are detected by the recording optical Point P where the pen 65 touches the front board 11
The coordinates of are calculated, and the calculated values are supplied to an external display device or memory device. Therefore, characters and figures drawn on the display board device of the present invention can be drawn on an external display device in real time, or can be stored in an external memory device and displayed on an external display device when necessary.

Furthermore, a miniaturized version of the display board device of the present invention can be used as a coordinate input device for personal computers and the like.

[Brief explanation of the drawing]

FIGS. 1A and 1B are a rear view of a portion of a display board used in an embodiment of the present invention, and A-A thereof, respectively.
2 is a perspective view of an optical pen for recording or erasing used in the present invention, and FIGS. 3A and B are a front view of the rear bow F'13 of FIG. 1 and its AA cross section, respectively. Front board 1 of FIG. 1, IA and B, respectively.
1 is a rear view and a side view showing an example of the display board device of the present invention, and FIG. Figure 6 is in Figure 5,
Display board 10 for showing the path of current I4 flowing from counter electrodes 70c and 70d through electrolyte solution 17 to point Q illuminated by the optical pen on rear board I3 when resistor [81 is omitted. Longitudinal cross-sectional view, No. 7
The figures show an electrical equivalent circuit of the display board 10 of FIG. 5, FIG. 8 is a perspective view of a conventional display board device, FIG. 9 is a vertical sectional view of the display board 10 of FIG. 8, and FIG. 8 is a cross-sectional view of the electric erasing eraser 0 shown in FIG. 8, and FIG. 11 is a circuit diagram of the power supply unit 300 shown in FIG.

Claims (2)

[Claims] (1) A display board device comprising a display board, a recording optical pen, an erasing optical pen, and a coordinate detection section, the display board having a front board and a rear board facing each other. This is an electrochromic display device in which an electrochromic material is interposed between the rear board and the rear board, in which a large number of small embedded electrodes are arranged in a matrix in a transparent insulating substrate, and embedded through the transparent insulating substrate in the thickness direction. The collectors of the first and second phototransistors, which are complementary to each other, are commonly connected to each of the buried electrodes, and the light-receiving surfaces of the first and second phototransistors face the transparent insulating substrate. First and second optical filters having different wavelengths are interposed, respectively, and the front board has a transparent resistive film formed on the surface of the transparent insulating substrate facing the rear board, and the upper and lower and left and right edges of the resistive film are A pair of opposite electrodes each made of a long and thin strip-shaped conductive film are formed in parallel to each other, and the recording optical pen has a light emitting element and emits light of a wavelength that passes through the first filter. The light can be emitted from the tip of a pen, and by scanning the front board with the tip of the pen, the light is incident on the first phototransistor through the first optical filter, turning on the transistor, and A current is passed through the electrochromic material from the resistive film in front of the buried electrode connected to the collector to display the scanning locus of the pen on the display board, and the erasing optical pen has a light emitting element, and is capable of emitting light of a wavelength that passes through the second optical filter from the tip of the pen, scans the front board with the tip of the pen, and transmits the light to the second optical filter. The current enters the second phototransistor through the phototransistor, turns on the transistor, and causes a current to flow in the opposite direction to that during recording through the buried electrode connected to its collector, thereby controlling the scanning trajectory of the recording optical pen. The coordinate detection section detects the current flowing between the collector of the first phototransistor and each of the counter electrodes, and based on the detected values, detects the current on the front board at the tip of the recording optical pen. A display board device, characterized in that it calculates coordinates on the top and outputs the calculated values to the outside. (2) In claim (1), the resistive film formed on the surface of the front board facing the rear board is removed, and the counter electrode is formed directly on the edge of the front board. display board device.