DE2106374B2 - DISPLAY DEVICE - Google Patents

Description

The invention relates to a display device for displaying characters and information Light sources are arranged in rows and columns, these in series with controllable semiconductors are switched.

Such a display device is known from US Pat. No. 3,389,389.

These display devices should have the highest possible resolution, i. H. a large number of display points so that the information is reproduced as completely as possible. A change of information should be displayed quickly, with a multicolored display a good color mixture should be to be possible. The brightness of the display points must be so great that when used for advertising purposes the best possible visibility even from greater distances (a few hundred to a thousand Meter) is reached. The input of the information is supposed to be done with the help of the optical scanning of an original picture to be possible. All of these requirements should be as possible with a minimum of management effort high operational reliability can be achieved.

These requirements are only partially met by known systems of this type. Bodies in shape a matrix in which all points of a grid are scanned one after the other and switched on for a short time depending on the pattern get by with the minimum possible number of cables. Since, however, used for this very quickly reacting display organs such a display device can only be made using gas discharge tubes or semiconductor light sources can be realized. These light sources can be used for advertising purposes however, do not use them because they are either not bright enough or prohibitively expensive.

Another known method (German patent specification 847 398) works with a reduced line expenditure too sluggish to show moving pictures.

In the German OffenJegungsschrift 1 811 003 another method is described, with the inclusion every single grid point is done with an electromagnetic relay. Here is the one too The line expenditure is still considerable, and the operational reliability through the use of mechanical Contacts is restricted.

The invention is based on the object of a display device with electromagnetic display elements or to create light sources, preferably incandescent lamps, with the least possible wiring effort with the help of semiconductor components, single or multicolored images and / or characters also in quick change can be shown operationally reliable and at the same time any control the individual light sources or display elements is possible.

This object is achieved in that according to the invention in the common lead in each column are arranged extinguishing switches and that the semiconductors connected to busbars via decoupling diodes are, in each of which a line switch is provided.

According to one embodiment of the invention, the

»5 light sources and semiconductors constantly with the voltage source tied together.

What is achieved by these measures is that, on the one hand, any desired light sources can be controlled and that, on the other hand, the common supply line of each column or row is only available for deletion for a short time is interrupted. In order to obtain a flicker-free image, the individual light sources must be switched on very quickly one after the other, the switch-on time being shorter, the greater the Number of light sources or grid points is. In the case of large grids, you can only switch on impulses on the order of microseconds to disposal. A visible display can only be achieved if the lamps have a remain switched on long enough to achieve a glowing effect.

According to a further embodiment of the invention, the extinguishing switches can preferably be actuated step-by-step. This ensures that the switch-on time is the same for all light sources, since one or more columns or rows are only gradually deleted shortly before new information is stored
According to a further embodiment of the invention, the line switches can be switched on with a time shift to the cancel switches.

The invention is to be explained in more detail below with reference to the drawings. It shows
A b b. 1 a schematic circuit diagram,

A b b. 2 shows the writing and image change process schematically and

A b b. 3 shows a circuit diagram of an embodiment of the display device.

It is assumed that the display device is in the form of a matrix in horizontal lines and vertical columns is divided. Each column has its own direct current source 1, to which all lamps are permanently connected to this column via a thyristor.

6 _{S In} principle, however, it is possible to feed all columns from a common direct current source. Then the negative lines of all columns must be decoupled from each other with chokes or diodes

I /

in order to prevent a simultaneous ignition of all columns for _{an image frequency VO} n 24 fps.

In the common feed line of each column there are = 20 833 pixels.

, I the quenching switch 3. The gates of all thyristors It is obvious that with this procedure nor

One line only allows digital states to be achieved via decoupling diodes 4'an 5

Busbar 5, which can be associated with the line. A half-tone representation. Not theoretically

switch 6 leads. All line switches 6 are single-pole with possible. However, in particular oei uc

connected to the positive pole of the ignition device 7. The minus color representation creates intermediate tones. To do this,% c

Leitun «of the supply voltage of each column is the ignition pulses for one or two« ^ru -

at the associated column switch 8, all columns are periodically blocked, which means that the

«Rhal-r 8 are single-pole lamps connected to a collective lead, e. B. only 20 times per kunae

tied, which leads to the negative pole of the igniter 7. be switched on while the other i-aroe

When closing a column switch 8 and 24 times per second is switched on. Thereby he

of a line switch 6, the assigned cross receives these two lamps with a low brightness

Initially, that is, the gate of the thyristor, has an ignition 15 than the other lamp. ™ ^you ^ - ^d « ^Ρ *** ί ^ ^ _n " fst

impuis The thyristor ignites and the lamp burns is preferred. To flicker * ^e ™ «« "· '*

SoC «e until the delete switch in this column briefly strives for the highest possible frame rate.

Type is and the thyristor thereby clears, e! With this process alas, only color

The information is therefore stored. As the tone or brightness changes over the whole speed he

Cancellation only must take place when a new "representing evenly distributed. To get a real Hell.g-

I nformation ^L entered to widen, satisfies a one ke.tsabstufung a BiI ** "^ '^ ΐ ^

mal-ces scanning of all raster points in order to correspond a standing input pattern of the information on

Si ru write. To be changed to moving images or quickly. This can e.g. ^B · achieved thereby

be to represent characters, the picture must be that the scanning pulses from 'tingabeoημη

Grid periodically erased and rewritten into the lines on it as quickly as possible below a certain stimulus threshold. Control the extinguishing switch so that it is only activated at each ir1 ζ «* £ ^Bl £

S w dd time from

R p

then be re-enrolled. Control the extinguishing switch so that it is only activated at each ir1 ζ «* £ ^Bl £

S ihlb wi millikd d hll an ignition pulse at the predjenden Zjjpunkt

then be re-enrolled. Control the cancellation switch so that j £ £

Solves an ignition pulse to the predjenden Zjjpunkt within eternal milliseconds or faster so that there is no annoying flickering even then. Another possibility is that de

30 ^{so within} ^ ^{one picture} -

7 To clarify the function, the writing color rendering is used can be a de-

and image change process in A b b. 2 image representation in 70 phases in terms of contrast and

posed. On an initially empty grid with 5-7 images- 35 color mixing can be achieved. ·. _{nen v}

the letter »T. and immediately afterwards the An exemplary embodiment of the ver

Estabe "U" should be written. The columns drive for a simple rb.ge A-eigeufel m, t high

«Ground from left to right, the lines from the top score is in Ab b. 3 ^dar g " ^te1 ^" ^ i ¹ JJ: "

written down. As soon as the writing function results in a three-color marking. a column is started, the following 4 ° is, however, three cell switches and one color remote control

^{Column by a switching device} camera, described later, used «* ^e 7 * ⁿ ' _nM ie ™ tor 9 controls a tune automatically deleted. From A b b. 2 can be seen, a quartz-stabilized generator ^ control a

because «" the change of information through displacement ^^^^^^ £ ^^^

It does not matter whether this process takes place horizontally or vertically, the sampling frequency is equal to or equal to 500 kHz, since it is basically all. Be. a switch of the number jon ^ 5 M.kro writing directions are possible. The resulting seconds s.ch results in einerJ ™ P ^U gap of a column is at choice of a sensible 500 kHz a pulse duration of ⁵ M f B 24 B / itlih you hk jJj ^^^^ T?

Gap from a spa

Frame rate f _b of z. B. 24 B / s very short in time, you jJj ^^^^ T? S.

concerned or, in the example shown, Vi ₂₀ S and _d j _{eren connected to} the inputs of the cell switch 12.

g is no longer perceptible with the eye. The last stage ^^

The choice of the image frequency f _{b also} results in the second rate counter 1 d ^

the maximum number of points on the grid. It has a transitions the column switch 13 ^ teu ^ert · switch the thyristors of about 1 microsecond 55 The cell switch is au ^^ ^of be eerechnet as thyristors with shorter inputs corresponding number of | ^ ^{'s' s} degrees, fchaltzeiten currently are still too expensive and therefore transformer output and "^" g ^ J '^ S cannot be used. Taking into account each transistor stage is a V ^ ⁰ " ⁰ * ^ 1- ^ f _n a" tet, whose second input S ™ »Jm ugehongen From the temperature range, the ignition pulse should therefore 60 gear of the controller M connected« t Dje L.n_

Ä ZX ^ rl ^ kt 'S:; S ^^ haUer ^ steln ^ erder ^ zJJ

all unilaterally interconnected output - triggered. At the same time the horizontal deflection

transformers of the line switch, whereby the 18 from the output of the counter 10 is controlled so that

Ignition circuit is closed. again with the help of a staircase voltage the beam

Before a column is written, it is scrolled from left to right in succession. Below Column deleted. This is achieved in a very simple manner by the fact that the original image is analog and achieved in that the column switch of each column is scanned in synchronism with the display grid. Of the with the delete switch 14 of the next column beam return is from bottom right to top left is connected in a suitable manner so that again triggered by the last pulse of the counter 11. Thereon a ring circuit is created. The delete switch basically starts scanning the image and the display from one or more switching transceivers.

sistors that are in the positive line of each column. To save still images e.g. B. for ejecting by the switch-on pulse of the previous soft programs, the pulse pattern of the remote column can be temporarily blocked. In addition to this, the vision camera has three additional functions in a number of magnetic core memory 19 switching transistor. As a result or semiconductor memory are written. One of the very large load fluctuations in a column at 15 such a matrix then contains the same number of economical design of the associated current from storage elements as the display grid points supply device contains visible fluctuations in brightness and can be read or erased non-destructively. and saved again. For this purpose, only one supply voltage needs to be stabilized. In addition, write and read electronics are required,
it is desirable to limit the current in the load 20 Since the whole system is very simple to make in a circuit to make the sensitive semiconductors from destruction to pulse ratios in a short circuit in a fixed temporal relationship to each other in the column, z. B. by exploiting. In addition to this, there is another safety button. Delaying and shifting of impulses purely functionally necessary: Since switching on at the same time electronically similar trick effects are achieved, as all lamps, z. B. when tearing the scanned 35 in television technology. Here are just a few of the films that cannot be avoided. B .: Representation of geometric patterns: load on the supply line 25 is coming. To prevent this shifting, enlarging, reducing and distorting, is in the supply line of the picture; Polarity reversal, blanking of image in a current monitor, the load case 100 ° ₀ over the parts as well as a practically unlimited number of the safety switch 23 every other column da- 30 screens.

by clears that he can switch the transistors of these tickers with the help of normal remote columns locks. An acoustic signal 26 indicates this state at any point on the display. When applying these rasters are reproduced. For this purpose, the Safety circuit, it makes sense to recode two or teletype pulses in an additional device more adjacent columns from the same stream 35 and a character generator with shift register To feed the supply device, since then an over- entered into the display grid. In the same way load of the power supply unit can also be used for telex typing for playback is avoided. can be used by scrolling text.

If the video amplifier is now at a certain level, it is sufficient for the display of still images.

When a pulse is emitted, the gates of 40 will write the whole grid, only once and then

Line switch controlled, and turn off the respective control electronics.

The meter reading of the activated power level indicates the stored image then remains until the

Ignition pulse on the corresponding thyristor. get schung. During this time, the tax

In order to enter the information, a television electronics system uses the »time sharing process« to click or

camera is used, the deflection part of which is fundamentally switched over 45 several other display grids,

was changed. Since only a relatively small result of the fact that the deletion is automatic

Resolution is required, can always be column by column while saving the image

inexpensive vidikons are used. new information occurs, a freeze frame would

The vertical deflection 17 of the camera is so from the representation ζ v. Usually one column is always missing. Around

Generator 9 is controlled so that a staircase voltage is generated

that shuts off the beam of the image pick-up tube shortly before the end of the writing process.

one pass of the counter 10 switches gradually from, so that the empty column is still written

upper to lower edge of the picture. The column return is automatically restored without the following one

run is cleared by the last pulse from counter 10.

Hxeiza 1 sheet of drawings

Claims (4)

Patent claims: 1. Display device in which light sources are used to represent characters and information are arranged in rows and columns, these being connected in series with controllable semiconductors are, characterized in that in the common feed line in each Column extinguishing switch (3) are arranged and that the semiconductors (2) via decoupling diodes (4) are connected to busbars (5), in each of which a line switch (6) is provided. 2. Display device according to claim 1, characterized in that the light sources and Semiconductors (2) are constantly connected to the voltage source (1). 3. Display device according to claims 1 and 2, characterized in that the extinguishing switch (3) can be operated gradually. 4. Display device according to claims 1 to 3, characterized in that the line switch (6) closes with a time shift the extinguishing switches (3) can be switched on.