JPS60172093A - Display information exchanger for electrostatic type display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Technical Field> The present invention relates to a display information exchange device for an electrostatic display device, and more specifically, to a display information exchange device for a display device in which a large number of electrostatic display units are arranged in a matrix. Relating to a device for partially exchanging information.

<Prior Art> First, the principle of an electrostatic display device will be explained. When a dielectric layer is interposed between a fixed electrode and a movable electrode and a voltage V is applied between both electrodes, polarization occurs in the dielectric layer due to the electric field generated between the two electrodes, and a polarization occurs between the fixed electrode and the movable electrode. A suction force is generated,
This attractive force causes the movable electrode to be attracted to the fixed electrode, changing the state viewed from the front.

FIG. 1 shows an example of an electrostatic display unit. A cylindrical inner fixed electrode 2 is provided in front of the pedestal 1, and film holders 3, 3 made of a conductive material are in contact with the left and right sides of the pedestal 1, and movable electrodes 4, 4 held by the film holders are in contact with each other. It extends forward, and the front end 5°5 forms a free end. Outside fixed electrodes 7.7 are fixed on both left and right sides of the film holder via insulating spacers 6.6. The outer fixed electrodes 7, 7 have a shape that gradually moves away from the inner fixed electrode 2 as they approach the inner fixed electrode 2.

The base 1, the film boulders 3, 3, the fixed ends of the movable electrodes 4, 4, the spacer 6.6, and the rear end of the outer fixed electrode 7.7 are fixed together with machine screws 8, 8.

The surface of the inner fixed electrode 2 is coated with an insulating paint having a predetermined color such as white, red, Vl, green, etc. to constitute a dielectric layer. The inner surfaces of the outer fixed electrodes 7, 7 are also coated with an insulating paint having a predetermined color such as black, white, red, yellow, green, etc. to constitute a dielectric layer. Further, both sides of the movable electrode 4.4 have mirror surfaces.

A leg-shaped terminal 7 is provided at a predetermined position at the rear end of the outer fixed electrode 7.
A, 7A are integrally formed, similar terminals 2A, 2A are integrally formed at a predetermined position on the rear end of the inner fixed electrode 2, and a similar terminal 4A is integrally formed at a predetermined position on the rear end of the film holder 3. ing. This terminal is inserted and connected to a connector (not shown in FIG. 1) provided on the board.

When a voltage is applied between the terminals 4A and 7A, an electrostatic force acts between the movable electrode 4 and the outer fixed electrode 7, causing the movable electrode 4 to open outward and cover the inner surface of the outer fixed electrode, causing the movable electrode 4 to open from the front. The color applied to the surface of the inner fixed electrode 20 is visually visible. When a voltage is applied between the terminals 4A and 2A, an electrostatic force acts between the movable electrode 4 and the inner fixed electrode 2, so that the movable electrode 4 covers the surface of the inner fixed electrode 2, and from the front, the outer fixed electrode The color applied to the inner surface of the electrode 7 is visually visible.

By closely arranging these display elements in a matrix on a substrate, a desired character pattern or the like can be displayed in a desired color, as shown in FIG. 2, for example.

Furthermore, by shifting the display information at a constant speed, a longer sentence can be displayed in succession, and by changing the display pattern little by little, a moving image can be displayed.

There may be cases where it is desired to omit part of the back of such various display information or to replace it with other display information.

<Object of the invention> An object of the invention is to be able to easily and quickly change a part of the display content without interrupting the display, and to
It is an object of the present invention to provide a display information exchange device for an electrostatic display device, which can easily store display information of the same type.

<Configuration of the Invention> The device of the present invention includes a RAM that stores a part of display information.
(random access memory) and a battery for backing up the RAM are mounted on a single board, and the board is configured to be detachable from the main body of the control device.

<Description of Embodiments> FIG. 3 shows a circuit configuration diagram of the entire device. The display unit 21 is, for example, 20x20, as shown in the front view display example in FIG.
It has a capacity of 0 dots and is an assembly of electrostatic display units 20. The drive circuit section 22 is composed of a large number of circuits in one-to-one correspondence with the display unit 20. The display register 23 is composed of a shift register having a 71-resonance structure which is shifted by a clock pulse CK, and each dot corresponds to each dot of the display unit 20. The clock signal CK is generated by frequency-dividing the output CL of the oscillator 24 by a frequency dividing circuit 25. The number of frequency division stages changes according to control command codes CI and C2, which will be described later, and therefore the frequency of the clock pulse CK changes accordingly. This frequency-divided clock pulse CK
As a result, the address counter 26 of the RAM 27 increments.

The RAM 27 is divided into a plurality of boards for each display content, and each board is detachable from the main body using a multi-connector. The stored contents of the RAM 27 are transferred to the display register 23 one column at a time through a data transfer circuit 28.

The contents of the divided RAM are read out in the order of ■-■-■-■, but for example, when ■ is 4.1, the contents of the divided RAM are read out in the order of ■-■-■-■.
and ■ are jumped and ζ is read out. This is controlled by the RAM control circuit 29.

FIG. 4 shows an embodiment of the RAM control circuit 29.

The RAM SEN terminal is a terminal provided to detect whether a RAM board is installed or not, and is connected to the ground level in the RAM board, and connected to the DC power supply +V through a resistor R in the main body example. Therefore, it becomes L (low) level when the RAM board is installed, and becomes H (high) level when it is removed. The chip enable terminal CE of the RAM is at the L level when the RAM is in the active state, and at the H level when the RAM is in the self-holding state. Of the four RAMs, only one is active. N OR Kate 31a
', 31b, 31c, and 31d are for detecting that RAM is installed and in an active state.
Two people are working, and the output becomes H only when it is L. The OR gate 32 is for detecting that all of the 411M NOR gates 1-31a to 31d are outputting, and the output becomes L at that time.

The OR gate 33 passes the clock signal CK when the output of the OR gate 32 is L, and masks the clock signal GK when the output of the OR gate 32 is H. The output of the OR gate 33 passes through the inverter 34 to the OR gate 35.
is input. The OR gate 35 is R
O' between the return signal indicating that the data of A M has ended and the clock signal CK that has passed through the inverter 34.
It has the R function, and the return signal becomes one note of the count-up signal to the ring counter. The ring counter 36 changes from Q1 to Q2 by the output T of the OR gate 35.
Set each output terminal to H in the order of -=Q5-=Q1. Each output terminal Q+--Q4 is inverter 37.38°39.40
and is connected to the chip enable terminal CE of each RAM. Control command codes C1 and C2 are written in each RAM along with display data. This control instruction code C
1 and C2 define a continuous display mode, high-speed shift mode, stop mode, and return mode as shown in the table.

The return mode is written immediately after the final data on the divided RAM. In addition, in the figure, 41 and 42 are inverters.

Next, the effect will be explained.

Assume that the first RAM 27a is now in an active state.

Since the output of the first NOR gate 31a is at H level, OR gates 32 and 33 are both at H level, and clock CK is masked and not detected. At this time, since the inverter 34 is at L level, the OR gate 35 is in a state where it can detect the return signal of the control command. 1st RA
When the final data of M27a is completed, the control command detection circuit 43 detects a return code and outputs a return signal.

As a result, the ring counter 36 becomes 12 RAP, 427
At the same time as the chip enable terminal CE of the first RAM 27a is turned to L, the chip enable terminal CE of the first RAM 27a is turned back to H. Therefore, if the second RAM 27b is installed, the output of the second NOR gate becomes H,
As in the previous case, the system waits for a return signal. In this way, the RAM 27a.

When 27 b, 27 c, and 27 d are all installed, the return instruction code written immediately after the final data in each RAM causes a-1) as shown in FIG. 5(A). The activation state changes in the order of -Cda---, and the stored information is read out.

If the second RAM 27b is removed, the attachment detection terminal SEN becomes H, so the output of the NOR gate 31b becomes L regardless of the level state of the chip enable terminal CE. When the return command of the first RAM 27a is detected and the ring counter advances to C2, 4
All outputs of the NOR gates 31a to 31d are L.
Therefore, the output of the OR gate 32 also becomes L, so
The OR case 1.33 becomes in a state where it can detect the clock signal CK. Since the clock signal CK is output intermittently, the ring counter 36 increments from C2 to C3.Here, if the third RAM 27C is installed, the output of the OR gate 33 is It is always H, masks the input of the clock signal CK, and the third RAM 27
Waits for a return command by c.

In this way, the RAM that is not attached to the connector
You can jump to the address of Figure 5 (B)
The figure illustrates the display data reading order when only the second RAM is removed.

Next, as shown in FIG. 5(C), when RAMe with the fifth content is connected to the multi-connector of the second RAM,
The display is executed in the order of 2l-6-(-x d-2-+-.In other words, the display contents can be changed without operating any switches by simply removing RAMb and inserting RAMe. can.

It goes without saying that the embodiment shown in Figure ff14 can be implemented using other modified logic circuits.

FIG. 6 shows the configuration on one base that can be attached to and detached from the main body. As an external terminal of RAM, address specification terminal AO
・-・A11, display data output terminal.

-DI3, control instruction code output terminal cl, c2. There are write enable terminals WE and chip enable terminals CE which are subjected to pull amplifier processing.
and a mounting detection terminal SEN. Power is supplied from the DC power supply terminal VDD to the RAM through the diode DI, while hack-up power is supplied from the bank amplifier battery B through the diode D2 connected in parallel with the diode DI. When the board is disconnected, the external voltage VDD is cut off, so the diode D2 becomes conductive. When the board is connected, the external voltage VDD is slightly higher than the internal battery voltage, so the diode D2 is cut off and the external voltage VDD is turned off. Only power is supplied.

FIG. 7 shows a partially cutaway view of the external appearance of one board. The board 5I is housed and protected in a package 52, and the plurality of connection terminals 53 of the board 51 are inserted and connected to the main multi-connector. Further, the lever 54 allows the pan cage to be removed from the main body.

On the outside of the package is a figure that represents the displayed content.

A card 55 with characters, titles, etc. written on it can be pasted or inserted into a transparent case.

<Effects of the Invention> According to the present invention, the memory can be changed simply by removing or replacing the packaged board, so the display contents can be easily and quickly changed without folding the display. be able to.

Furthermore, since the display contents are organized for each board and the RAM is banked up by a battery, it is extremely convenient to manage and store display information.

[Brief explanation of drawings]

FIG. 1 shows a perspective view of an example of an electrostatic display unit 1- used in the present invention. FIG. 2 shows an example of a display according to the present invention. FIG. 3 is a circuit block diagram showing the entire embodiment of the present invention. FIG. 4 is a circuit diagram showing a specific example of the RAM control circuit of FIG. 3. FIG. 5 is an explanatory diagram of the operation of the embodiment of the present invention. FIG. 6 is a circuit diagram inside the divided RAM according to the embodiment of the present invention. FIG. 7 is a partially cutaway perspective view showing the external appearance of the divided RAM according to the embodiment of the present invention. 2-Inner fixed electrode 4-Movable electrode 7-Outer fixed electrode 2-Capacitive display unit 21...
・Display section 22・-Drive circuit 23・-Display register 27-RA M29-RAM
Control circuit 51 - board 53 - connection terminal B - hack-up battery patent applicant
Daiwa Vacuum Industries Co., Ltd. Agent Patent Attorney Nishi 1) New 7A Figure 2 7 Figure 5 r: 5EA/ Figure 7

Claims (1)

[Claims] a fixed electrode, a movable electrode having elasticity attached close to the fixed electrode, a dielectric layer provided on one or both of the surface of the fixed electrode or the dislocation of the surface of the movable electrode, and the fixed electrode. and a lead wire for applying a voltage between the movable electrode, and when the voltage is applied, the movable electrode is electrostatically attracted to the surface of the fixed electrode, so that the appearance of the unit becomes clear. A device for controlling display information of a capacitive display device in which a large number of capacitive display units configured to change are arranged in a plane, and includes a RAM (random access memory) for storing part of the display information; A display information exchange device for an electrostatic display device, characterized in that a battery for backing up the RAM is mounted on a single board, and the board is configured to be detachable from the main body of the control device.