RU1800499C - Cathode-luminescent screen - Google Patents

Abstract

Usage: in electronic technology, in particular in televisions, video telephones, computers. SUMMARY OF THE INVENTION: Thin-film electrodes are placed on a circuit board, combined into a system of horizontal rows such as a double comb of cathodes (transverse emitters), anodes, current-carrying buses and a starting bus, with a vertical row of cathodes, anodes and current-carrying bus, the corresponding bus-supplying buses are combined and connected to external terminals, one group of current-supplying buses horizontal lines connected to a source of alternating shift, another group of current-carrying dvod boiling tire vertical line is connected to a source of alternating voltage frequency of the lines, and output-connected to the start pulse source frame rate. 4 ill.

Description

The invention relates to electronic equipment and can be used in all sectors of the national economy, in particular in televisions, video telephones, computers.

The purpose of the invention is to simplify the design and reduce the cost of the screen.

The goal is achieved by the fact that in a cathodoluminescent screen containing a flat vacuum cylinder consisting of a glass plate and a sheath, a system of cathodes, anodes coated with a layer of phosphor and busbars, on a circuit board whose function one of the inner surfaces can perform vacuum cylinder, toploconductor electrodes are placed, combined with a system of horizontal strings of the double comb type from cathodes (transverse emitters, anodes, current-carrying buses and start-up buses, while

at the beginning of the horizontal lines there is a vertical line of cathodes, anodes and a current-carrying bus, the corresponding current-carrying buses are connected and connected to external terminals, one group of current-carrying buses Horizontal lines are connected to a source of alternating shear stress, the other is a group of current-carrying tins A vertical line is connected with a source of alternating voltage, the line frequency, and the trigger terminal is connected to the pulse source frame rate. In addition, a phosphor is applied to the anode with an alternation of color: red, green, blue. ;

In FIG. 1 is a circuit diagram of a deflector; in FIG. 2 - topographies of the deflecting system, where 1 is the bus of vertical rows, 2 is the trigger bus, 3 is the common bus, 4

00

about

2

oh oh

- the width of the horizontal lines, 5 - the anode, 6 - the cathode, 7, 8, 9, 10 - the external terminals of the respective buses.

Cathode 6 is a transverse type emitter, which is a thin film with a thickness of 100 A to 2 μm (depending on the film material), a length of 50-200 μm and a width of 20-100 μm.

Anode 5 is a site measuring (50-200) x (50-200) microns in size, made of a conductive film and coated with a phosphor of the desired color.

The busbars 1, 2, 3, 4 are a conductive film with a width of 20-50 microns, for example, an aluminum film with a thickness of 0.5-2 microns.

The gaps between the elements are selected within 10-200 microns depending on the voltage on the tires.

The examples given are unprincipled and are given for orientation of a screen measuring 250 x 180 mm.

The cathode and the opposite anode form a diode. Since both the cathodes and anodes lie in the same plane, the electrons emitted by the cathode hit the anode along arcuate paths.

A system of m diodes located between two horizontal buses forms a horizontal row. A system of n horizontal lines is a field of a deflecting system. In the horizontal row system, one end of the cathode of the diode with transverse alternation is connected to the buses 3, 4, and the other end is connected to the anode of the previous diode, forming a double-comb connection.

At the beginning of the horizontal lines there is a vertical line between the tires 1, 2 with a double-comb connection, with one end of the cathode connected to one bus 3, the other end of which is connected to the anode of the diode, the cathode of which is connected at one end to bus 1 and the other end to with one end of the cathode of the start diode, and the anode of the start diode is connected by the cathode of the horizontal row. Another end of the start diode is connected to the anode of the diode, the cathode of which is connected to the bus 3. At the beginning of the vertical line, the cathode of the first anode is connected to the start bus 2. The horizontal and vertical line buses and the start bus are output to external terminals 7. 8, 9, 10. In this case, terminal 9 is common, and control voltages are applied to terminal 7, 8, 10.

The principle of operation of the screen circuit is based on the effect of moving the emitting state (excitation) of a group of cathodes along the field of the circuit when controlling the alternating voltage applied to the output

circuits, which corresponds to the movement of the light spot, similar to the movement of the spot on the screen of a cathode ray tube.

To ensure this effect, it is necessary to fulfill the basic condition - the through current through the cathode should be no more than the current of the anode of the diode. This condition is achievable for thin film cathodes.

Consider the operation of a vertical line.

We apply a pulse voltage to terminal 8, and a 7-plus voltage to terminal 8 so that the cathode of the trigger diode is excited, i.e. provided a current greater than the through current (start current) in the anode circuit. However, the current did not stop even after the start pulse ceased. The flowing current excites the cathodes in the anode circuit of the diode. And the excited cathode of the second diode, when a positive voltage is applied to terminal 10, starts the first horizontal line. When the sign at terminal 7 is changed, the negative voltage is applied, and in the absence of a start pulse, the anode current of the third diode maintains the cathode of the third diode and the cathode of the fourth diode in an excited state. The excited state of the cathodes of the first and second diodes is terminated. At the next sign change at terminal 7, the positive voltage is applied, the cathodes of the fourth, fifth and sixth diodes are in an excited state, and the second horizontal line is triggered by the current of the anode of the fifth diode. At the next change of sign - minus at pin 7, the sixth and seventh cathodes are excited and so on.

The horizontal line layout works the same way. In the presence of a starting current with a positive voltage at terminal 10, the first and second cathodes are excited, when the sign changes, the excitation moves to the second and third, then the third and fourth, etc.

In order to sequentially pass the circuit field, it is necessary to fulfill the synchronization conditions, as shown in the timing diagram of FIG. 3. Pulses the frequency of the frames with the start period Te is fed to pin 8, the pulses the frequency of the lines with the period Tst to the pin 7. Shift pulses of the meander type with the period of the TSd to the pin 10.

The duration of the pulses

the period period of the lines ТСт m Тсд. where m is the number of diodes in the horizontal line, the duration of the .frame T3 p TCT nm Tc. where n is the number of horizontal lines.

The pulse duration r must be not less than the cathode excitation time, which for film emitters of the transverse type can be less than 0.1 ft cc (see Non-heated cathodes. M: Soviet Radio, 1974, p. 29-35).

The topography of the deflection system is shown in FIG. 2, where the elements painted black correspond to the cathodes 6, the shaded elements correspond to the anodes 5 and the buses 1, 2, 3, 4 are made without shading. The anodes of the horizontal rows are coated with alternating color phosphors - red, green, blue, for a single-color image the anodes are coated with a phosphor of the same color. Electrode patterning techniques include applying thin films of cathode material by spraying or pyrolysis methods or by rolling from a powder material. Spraying or knurling of busbars and anode pads, applying phosphor is carried out by printing or cathophoresis. These MOCCQB.O processes are used in the technology of fancy fluorescent indicators.

The electron trajectory property — the arcing — allows you to place the launch anodes of horizontal rows behind bus 3. This eliminates the insulating films, while maintaining the operability of the trigger diodes.

In FIG. 4 is a control block diagram including a programmer 11 that generates control signals according to the program laid down in it and supplied to the corresponding terminals 7, 8, 9, 10 of screen 12. The magnitude of the voltage at the terminals is determined by the cathode properties, screen brightness requirements, and the admissible distance between the electrodes, which exclude the possibility of breakdown (the floor strength in the gap between the electrodes is permissible in the range of 2-3 kV / mm).

So, for example, for a non-incandescent cathode based on tin oxide with a cathode size of 100 x 300 μm, the voltage does not exceed 150 V (see Non-incandescent cathodes. M: Soviet Radio, 1974, p. 29-35), current in the range 10-100 μA corresponds to the current density of the anode 10–3 A / mm2, which is quite sufficient for bright luminescence of the phosphor. By changing the magnitude of the shear stress, the screen brightness can be controlled.

The claimed design makes it possible to obtain large brightnesses by organizing reconnaissance simultaneously on several launching channels with dividing the board into bands corresponding to these channels. This is applicable on the screens of video telephones and computers.

In addition, the claimed design of a cathode-luminescent screen makes it possible to reduce the cost of the screen by 10 times compared to existing picture tubes by eliminating the complex designs of cathodes, focusing electrodes, deflecting and deploying systems, and simplifying the balloon; reduce the power consumption of the screen by 5-10 times by eliminating power consumption in focusing, deflection and beam scanning systems; eliminate the dangers of x-rays due to a decrease in the magnitude of the voltage on the screen; reduce the cost of a television receiver by 5-10 times by eliminating labor-consuming and metal-consuming bias systems, a number of power sources, and reducing the dimensions of the housing.

Claims (1)

SUMMARY OF THE INVENTION A cotodoluminescent screen comprising indicator elements located to the side in which each anode of the indicator element is connected to one output of the cathode of the last indicator element, the second output of which is connected to a power bus, characterized in that that, in order to provide the ability to display two-dimensional information, improve speed and manufacturability, the screen contains a system of horizontal lines and at least one vertical line containing communication diodes, the anodes of which are connected to the extreme adjacent cathodes of the corresponding horizontal line, and the cathodes are connected to the cathode of the subsequent element, and all the cathodes are made in the form of incandescent emitters of the transverse type and located coplanar with the anodes. ft ".3 3 U. /