JPH0443421A - Display board device - Google Patents

Abstract

PURPOSE:To display a character and a graphic on an external display device by means of an online on a real time basis or to tentatively store them in an external storage device by displaying the character and the graphic on a board by means of an electric pen and outputting picture information to an external part. CONSTITUTION:This device consists of the display board 10, the electric pen 50, an erasure electric mat 60 and a coordinate detection part 71. In such a case, counter electrodes 70a-70b are independently detected along the upper/lower and left/right edges of a back board 13 and radio waves Ia-Id flowing in respective counter electrodes 70a-70d are detected in the coordinate detection part 71. The coordinate of a point P where the electric pen 50 is in contact with a front board 11 is operated by respective detection values, and the operation value is supplied to the external display device and a memory device. Thus, the character and the graphic, which are to be drawn, can be displayed on the external display device by online on a real time basis or they are tentatively stored in the external storage device. Thus, they can be displayed in the external display 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 is designed to detect the coordinates of an electric pen on a display board and output that data to the outside.

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

As shown in FIGS. 4 and 5, the conventional display board device includes a display board 10, four pillars 21,
22, 23, 24, a circuit section 30, a power plug 40, an electric pen 50, and an electric eraser 0.

The display board 10 is of an electrochromic display configuration with a special front board 11.
The front board 11 includes fine ITO in a transparent insulating substrate 11i such as a transparent plastic substrate or a transparent glass substrate.
A large number of transparent electrodes 11c such as 1ft poles are mounted on a transparent insulating substrate 1.
They are arranged at a fine pitch of, for example, about 10 or more per square millimeter in the plane direction of the transparent insulating substrate 11i, and are embedded as display electrodes (front electrodes) through the thickness of the transparent insulating substrate 11i. be done.

The display board 10 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 (rear electrode) is placed on the surface facing the front board 11 of
14 is formed, 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 tungsten oxide layer 16 and an electrolyte solution 17 are formed between the front board 11 and the counter electrode layer 15. The counter electrode 14 is grounded.

In the example shown in FIG. 5, tungsten oxide (WCL) is used as a coloring substance (electrochromic material in a narrow sense), and a tungsten oxide layer 1 is formed on the back surface of the front board 11.
6 is formed in close contact with a thickness of about 5,000 layers, and an electrolytic RT melt Hi as an ion supply source is filled between the tungsten oxide 1W 16 and the counter electrode layer 15, and a lithium perchlorate propylene carbonate solution, for example, is sealed as the ion supply source 17. be done.

The pillars 21 to 24 and the circuit section 30 are attached to the lower end side of the display board 10. The power plug 40 is
It connects a commercial alternating current to the mains outlet, and is code 4.
4 is connected to the circuit section 30.

As shown in FIG. 7, the circuit section 30 includes a voltage source 35 that provides a negative voltage -Eo with respect to the ground potential of the counter electrode I4.
and the voltage s at which a positive voltage element Em is obtained with respect to the ground potential
36 are provided. The voltage -Eo is set to about -2V to -1V, and the voltage element Em is set to about +2V to +1V.

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. 7, the conductor 52 is connected to the variable resistor 53.
The variable resistor 53 is configured to be connected to the regulator 53a of
Both ends of the voltage a35 of the circuit section 30 are connected by a cord 54 to both ends of the voltage a35. Therefore, a negative voltage -EP is applied to the conductor 52 with respect to the opposing electrode 4 of the display board 10.

As shown in FIG. 6, the erasing electric maturo 0 has a plate-shaped conductor 62 attached to one side of a plate-shaped insulator 61 and a handle 63 attached to the other side of the insulator 61. As shown in the seventh image, the conductor 62 is connected to the positive side of the voltage source 36 of the circuit section 30 by a cord 64. Therefore, a positive voltage element Em is applied to the conductor 62 with respect to the opposing fii+4 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 transparent electrode 11c and the counter electrode 14 at the point of contact. At the point of contact, the tungsten oxide of tungsten oxide 1]6 is reduced and colored blue.

Since the above-mentioned electrochromic material has memory properties, once the coloring 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 this case, the adjuster 53 of the variable resistor 53 of the electric pen 50
a is adjusted and applied to the conductor 52. By changing the voltage -Ep, that is, the voltage applied to the transparent electrode 11c, the displayed color tone can be changed. Furthermore, since the display board 10 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, hold the erasing electric matsuro 0 in your hand and bring its conductor 62 into contact with the transparent electrode 11C at the colored point on the display board 10. A voltage element Em is applied between the transparent electrode 11c and the counter electrode 14 at the point of contact, and the reduced tungsten oxide at the point of contact is reoxidized and decolorized.

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. 5 in which tungsten oxide is used as a coloring material, and a negative voltage -Ep is applied to the transparent electrode 11c with respect to the counter electrode 14. This is a case in which the colored substance is reduced and colored, and the colored substance is oxidized and decolored by applying a positive voltage +Em to the transparent electrode 11c with respect to the counter electrode 14; A chromic material that is colored by oxidation and decolored by reduction is used as the chromic material, and a positive voltage is applied to the conductor 52 of the electric pen 50 with respect to the counter electrode 14, and the conductor 62 of the electric cloak 60 for erasing is
It is also possible to apply a negative voltage to the counter electrode 14.

Further, as the electrochromic material 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 display is displayed by changing the voltage applied to the conductor 52 of the electric pen 50. You can also change the color.

``Problem to be solved by the invention'' Conventional electrochromic 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 to the outside. . Lately, I've been trying to display 3 letters and figures on the board using an electric pen, and simultaneously display the same thing on an external display device, or temporarily store it in an external storage device and display it externally when needed. A new request was made. This invention is intended to meet these new needs.

"Means for Solving the Problems" (1) A display board device of the present invention includes a display board, an electric pen, an electric erasing mat,
the display board is an electrochromic display device in which a front board and a rear board are arranged facing each other, and an electrochromic material is interposed between them;
The front board is a transparent insulating substrate in which a large number of fine transparent electrodes are arranged as display electrodes at a fine pitch in the direction of the surface of the substrate, and are embedded through the board in the thickness direction. The above electric pen has a pair of opposing electrodes made of elongated strip-shaped conductive T# formed in parallel to each other on the upper and lower and left and right edges of the surface facing the front board of the insulating substrate. , has a conductor to which a positive or negative voltage is applied to the counter electrode, scans the front board while contacting the conductor with the transparent electrode, and displays the scanning locus on the display board. Yes, the erasing electric cloak has a conductor to which a voltage of opposite polarity to the voltage applied to one of the electric pens is applied to the counter electrode, and the conductor is brought into contact with the transparent electrode. The coordinate detection section detects the current flowing between the electric pen and each of the counter electrodes, and uses these detected values to determine the The coordinates of the point touched by the electric pen on the front board are calculated and the calculated values are output to the outside.

``Embodiment'' In this invention, while drawing letters, figures, etc. on the display board with an electric pen, the coordinates of the electric pen on the display board at that instant are detected, and the detected values are supplied to the outside to provide an online, real-time Then, the character 1 figure can be displayed externally or temporarily stored externally so that it can be displayed when necessary.

In the conventional example, the counter electrode 14 and the counter electrode layer 15 (hereinafter referred to as the counter electrode 70) are formed on almost the entire surface of the rear board 13, but in the present invention, as shown in FIG. They are formed independently along the upper, lower, left, and right edges of the rear board 13.

Each counter electrode 70a to 70d is connected to a common potential point through a low resistance value resistor r, to r, respectively, as shown in FIG.

As shown in FIG. 2, the distances between the contact point P on the front board 11 of the electric pen 50 and the inner ends of the opposing electrodes 14 a, 14 b, 14 c, and 14 d projected on the front board 11 are calculated as follows: j! ,,lb, 1c, 1m. In the conventional example, the current flowing through the electrochromic material is directed from the counter electrode layer (grounded) that almost overlaps the contact point P toward the electric pen 50 in a nearly vertical direction, as shown by the dotted line 71 in FIG. However, if the counter electrode 70 is divided and arranged as in the present invention, each resistor r,
The current flowing to the counter electrodes 70a to 70d through each of r4 flows from each counter electrode in the electrolyte solution 17 in a substantially horizontal direction and reaches the contact point P. Each of those currents is connected to the counter electrode 70a.
1. Corresponding to ~70d. ,L,IC,! , is expressed as .

Current 1. ．． 1. The resistance R1°R of the electrolyte solution 17 against
5 is the above distance @1. ．． Since it is approximately proportional to Il, 1,/
1. =Rb/R, -1%/f, (1).

e −+1. b=L+
If you put (2), you get distance! , is from equations (1) and (2).

It is expressed as Similarly current! . , 14, if the resistance of the electrolyte solution 17 is Rc, Ra, then 1-/Ia =
R-/Rc=Ila/lc (4).

lc11. =L, (5) and 1
Then, the distance M11 is expressed as 1°.

The coordinate detection unit 71 inputs the terminal voltages 1 to 4 of the resistors r1 to r4 (the common resistance value is r), and calculates the current 1 to flow through each resistor from the relationship: ~14 is detected, and from equations (3) and (6) above, the instantaneous coordinates of the contact point (1
a, i,), and the coordinate data is stored online.
Supplied externally in real time.

In the above, the coordinates (zn, 1.) are determined, but the coordinates C1c, L), (lc, i,), or (la, 1m) may be found.
Set the XY coordinate axes on the front board 11, and
y) coordinates may be determined.

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.

The rest of the configuration of this invention is the same as that of the conventional example, so a description thereof will be omitted.

"Effect of the Invention" According to this invention, the counter electrodes 70a to 70d are connected to the rear board 1.
The currents 1.3 and 3.3 are formed independently along the upper, lower, left, and right edges of the electrodes, respectively, and the currents 1. ~■4 are detected, and the coordinates of the point P touched by the electric pen 50 on the front board 11 are calculated from these detected values, and the calculated values are supplied to an external display device or memory device. Therefore, the characters and figures drawn on the display board device of the present invention can be drawn on an external display device online in real time, or can be stored in an external memory device and displayed on an external display device when necessary.

[Brief explanation of the drawing]

1A and 1B are a plan view and a front view, respectively, showing an example of the rear board 13 of the display board device of the present invention, and FIG. 2 is a contact point P on the front board of the electric pen in the display board device of the present invention. FIG. 3 is a display showing the paths of the currents 1c and I flowing from the counter electrodes 70c and 70d through the electrolyte solution 17 to the electric pen in FIG. 2. 4 is a perspective view of a conventional display board device, FIG. 5 is a vertical sectional view of the display board FIO shown in FIG. 4, and FIG. 6 is a vertical sectional view of the display board FIO shown in FIG. The cross-sectional view of Figure 7 is the 4th TI!
FIG. 3 is a circuit diagram of a power supply section 30 of J.

Claims (1)

[Claims] (1) A display board device consisting of a display board, an electric pen, an electric erasing mat, and a coordinate detection unit, wherein the display board has a front board and a rear board facing each other. An electrochromic display device in which an electrochromic material is interposed between
The front board is a transparent insulating substrate in which a large number of fine transparent electrodes are arranged as display electrodes at a fine pitch in the direction of the surface of the substrate, and are embedded through the board in the thickness direction. The above electric pen has a pair of opposing electrodes made of elongated conductive films formed in parallel to each other on the top and bottom, left and right edges of the surface facing the front board of the insulating substrate, respectively. , has a conductor to which a positive or negative voltage is applied to the counter electrode, scans the front board while contacting the conductor with the transparent electrode, and displays the scanning locus on the display board. Yes, the electric mat for erasing has a conductor to which a voltage of opposite polarity to the voltage applied to the conductor of the electric pen is applied to the counter electrode, and while the conductor is in contact with the transparent electrode. The front board is scanned to erase the scanning locus of the electric pen, and the coordinate detection section detects the current flowing between the electric pen and each of the counter electrodes, and detects the electric current from the detected values. A display board device, characterized in that it calculates the coordinates of a point touched by a pen on the front board and outputs the calculated value to the outside.