DE1947263C - Penetron color display tube and color display device for such a tube - Google Patents

Description

io ters Ko-ne.

, ^ _n grid electrode d, e iTarallel to the luminescent screen is arranged ver-spacing from this, _{isolierenι Ie from} the luminescent screen, - _{the inner} wall of the kolbentnch _the beam generation system and the _F relates to the invention one for such

_Farbfernse h picture tubes known whose ^ jn ,, _aU s with non-luminescent XSiselnden phosphor layers that * t _ic ht different colors emit,

^, _Patenl , _c hrift 1 172 298). The vu-

_{F be hangs} from the In ^ m OMctt ^ ^ ^^^ ^

a! s

The present invention relates to a penetron color picture display tube with a piston which has a neck and a funnel which widens from this, an electron gun arranged in the piston neck, a luminescent screen located at the wide end of the piston funnel, which is differentiated by electrons Stacked luminous stoles that emit lights of different colors! The layering of a Penctron tube selectively by a corresponding speed modulation of a dt :, ¹ η scanning electron beam, sts method is compatible with the color television of the United States of America. The color image is generated by selective excitation! Of a desired phosphor layer.

There are penetron tubes with three beam generating systems known, each with such a high voltage with respect to the luminescent screen arbei that the electron beam generated in each case excites the desired phosphor layer uc. In such a three-beam tube, the Kaihuden of the individual beam generating systems are biased with respect to the luminescent screen so that an electric field results, as is necessary for the acceleration of the electrons emitted by the cathode concerned to excite the corresponding phosphor. An obvious one! The disadvantage of these tubes is that three separate electron guns are required and the costs are correspondingly high.

There are also already known single-jet penetron tubes in which the voltage on the luminescent screen is switched between different high voltage levels to produce the single electron beam to accelerate to different speeds, which according to the stimulated Phosphor or the color to be generated are selected. A disadvantage of these tubes that is up to is present to a certain extent in all penetron tubes (German patent specification 1170 454) however, that the size of the grid written on the luminescent screen differs from that of the different acceleration voltages required for generating the different colors depends. The reason for this is that the deflection sensitivity in a picture tube is usually a function of the accelerating voltage of the electron beam.

With electrostatic deflection, the deflection angle is inversely proportional to the kinetic one Energy, i.e. the acceleration voltage of the electrons. With magnetic deflection systems,

947 263

the deflection inversely proportional to the square- According to the invention, this object is achieved

root of tension. To compensate for the onset of a penetron color display tube Russe of the accelerating voltage can indeed be solved named type, which is characterized by it The shape and amplitude of the deflection voltage or the is that the grid electrode rad the conductive surface Deflection current depending on that of the 5 isolated from each other and each with its own, for desired color corresponding speed outside of the piston carried out electrical of the electron beam can be changed, this is ever- connections are provided.

but because of the speed of the scanning and

the changes in the color component during the discharge electrode and the conductive surface in the piston funnel palpation difficult. With a point sequential io different voltages are supplied, and Color system are also high switching frequencies one can thereby both a perfect focus required in order to avoid a color flicker, as well as a perfect color raster was to achieve difficulties in the circuits to cover.

Accordingly, changing or controlling the scanning vibrations

leads. is a color image reproducing device with such

As is known, the misregistration can be identified by a Penetron color display device Grid are reduced, that the grid electrode with a source for draws that between the screen and the emitter generate a zar color switching voltage on the luminescence system is arranged and as close as possible to screen complementary Rastt leakage error Konibeim Screen should be located (German <. The patent ao compensation voltage is connected: and that the! Ei scripture 1 172 198). This grid then becomes a tending surface with a source of an essentially constant Voltage supplied. The biased borrowed constant tension is connected. The grid shields the electrons from fluctuations in these color genes the screen voltage from when they are in the image display device in the sub-claims area marked between the beam generation system and 35 surfaces.

the grid. In the case of small deflection angles, the idea of the invention will be discussed below

pass through the electrons in such an arrangement hand of exemplary embodiments in connection with tion of such tracks that they are also explained in more detail in various drawings. It shows nen acceleration voltages on the same image- F i g. 1 is shown partially in block form

element of the luminescent structure. 30 Circuit diagram of a color television receiver with a

The misregistration by such a single-beam Penetron color television picture tube and a However, do not eliminate measures. Certain connection circuitry for operating this tube and As is known, betterui.gen can still be done by F i g. 2 a circuit diagram of a switching high-voltage

achieve that you have an electron-permeable generator, the Gilter in the present invention supplies a tension that can be found synchronously with 35 turns.

the modulation of the voltage on the screen changes, The in F i g. 1 greatly simplified batch; shared remote

however, it is out of phase with this. The electron visual receiver is connected to an antenna 10, then pass through on their V / eg to a specific which is connected to an input part 11, which th picture element of the screen various transmissions as usual, a tuner, IF amplifier and video jectories between the beam generating system and 40 demodulator. The IF amplifier becomes the grid. In this way, changes can also change the carrier frequency difference between tones Direction of the beam caused by the modulation and the picture carrier of the composite television signal Screen insulation between the grid and take and a sound channel, not shown appear on the screen, compensated and the rest fed, which feeds a loudspeaker, borrowed misregistration can be further reduced. 45 As with the usual, with a shadow mask

In the case of a single-beam, three-color Penetron picture tube, color television picture tube is operating the acceleration voltage on the screen will catch the composite signal to the inputs of a switched between three different high voltage values of the luminance signal amplifier 12 and one chrominance, z. B. in a typical case of about signal amplifier 14 is supplied. The luminance-10 kV for excitation of a red fluorescent substance on the ring amplifier 12 contains, as usual, a delay over 20 kV to excite a blue phosphor. management line and amplified the relatively broadband If the beam with such a large voltage signal component that contains the achromatic information, Changes between the beam generating system The chrominance signal amplifier 14 is more narrow-banded and the electron-permeable grid is not included and processes a higher-frequency portion of the is focussed wall-free and if the beam 55 signal mixture that contains the chrominance information, speed is changed in the deflection range, To cut off the burst (color synchronization

are the beam focussing (impact spot size) and dwell time) and for the recovery of the dye with it the image resolution is bad. Such effects serve as a burst separator and color have a poor image reproduction result and oscillator circuit 15, in which the one color classes not through compensation voltages 60 broadcast on the back porch of the row Compensate for the electron-permeable grid. synchronisierLnpulse occurring bursts that the

Accordingly, the present invention is the phase and frequency of demodulating the color die The object is to have a Penetron-Farbbild- artsignals required reference carrier, playback tube and a color image display separates and synchronizes the color or to specify the facility for such a tube, the 65 reference oscillators are used, a color image reproduction with a minimum of An output terminal of the circuit 15 is with

Color raster registration errors and loss of quality of an input terminal of a color demodulator 16 supply through focus fluctuations. whose other input terminal is connected to the

Output of the color amplifier 14 is connected. Lines in the same way and therefore fall like this. The color demodulator 16 supplies, if necessary between those of the first partial image, that a connection with a matrix circuit, color difference interleaving results. The resulting line signals, e.g. RY, B - Y and GY. follow in the interlaced fields is then

The three color difference signals become three indications 5 red, blue, green, red, blue, green, etc. In such a system with a fixed line sequence

guided. The adding circuit 17 has another one obtains approximately 175 lines of each color, and a fourth input which is coupled to the output of the luminous intensity amplifier 12 for the color resolution in the vertical direction. The adding scarf - speaking small. In particular, in extensive red, tungl7 the color difference signals combined with the green and blue areas is then a coarse luminance or 7-signal and generates three signals, line structure visible, if not any of the measures used to suppress one for the generation of the color image such line ends correspond to primary colors, namely red and green structure. The vertical and blue. The three primary chrominance signals are of relatively poor resolution, the color of a line switch 18, which works at one of the adding circuit 17 three separate inputs 15 with the line sequence described, which results in a control system, but interferes with receivers, the voltage for the cathode of the Penetron picture tube contain a relatively small picture tube, 20 provides. The syn- contained in the composite signal practically not.

Chronizing impulses are generated by a separation stage 19. The picture tube 20 in FIG. 1 contains a single

separated and deflection circuits 21 supplied, the 20 beam generating system, iias only a single Elek as usual deflection coils 22 feed. troncnstrahl delivers. The tube 20 contains one

The deflection circuits 21 also contain a fluorescent screen 34 which, with an aluminum coating, provides high-voltage circuitry which is provided with the high voltage required for the operation of the picture tube and which can be a multilayer screen, via one of the three differently stimulable phosphors, and supplies line 23 to the picture tube. as indicated by P ₁ , P ₂ and P. Suitable

The circuit arrangement described above can luminescent screens and phosphors are known as in a known, commercially available Farbfern- (German Patent 1172 29S). In the direction of the visual receiver be formed. The receiver of the electron beam in front of the luminescent screen 34 is shown in FIG Fig. 1, however, additionally contains a reasonably dimensioned close distance Rinzähler 24, whose input terminal the line 30 network or grid 33 high permeability synchronizing pulses from the separation stage 19 assigned. The picture tube 20 also includes on the leads are. The ring counter 24 divides the line synchro inside the funnel of the glass made nizing impulses by three. Ring counter circuits, the tubular bulb have a conductive layer 35. The layer z. B. bistable flip-flops are loaded 35, the grid 33 and the fluorescent screen 34 are knows (cf. for example the book by M ill an and 35 from each other through insulating parts 80 and 81 electrical Taub, Pulse and Digital Circuits, McGraw-Hill, in isolation.

1956, chap. 11 "Counters". The ring counter supplies the fluorescent or luminescent screen 34 is

three output signals, which are fed to three input terminals of the line switch 18 with one terminal of a high-voltage switch 36 and are subsequently connected, which is controlled by a control circuit 36 a of mutually occurring pulses of the same width. The control circuit 36σ receives from the stand, the repetition frequency of which is a ring counter 24, two input pulse signals and a third of the line frequency. acts according to these pulses that the high-If the ring counter 24 puts a pulse, the voltage switch 36 of which on the luminescent screen 34 duration corresponds to a line duration, over a line that high voltage that supplies the cathode device 30 to the line switch 18, leaves this 45 of the picture tube supplied chrominance signal belongs. The signals of luminescent screen voltage corresponding to the red image component wi ^ d during the adder circuit 17 through. The signals corresponding to the green and return interval and corresponding to the blue color component are essentially constantly blocked during this interval. The next one held in order to get the desired primary color. ^

is equal to the line duration, occurs on a conductor 31 The grid 33 generally serves to remove the color fringes

and causes the cell switch 18 to suppress the green, which otherwise lets through the switching signals. ^the screen tension would occur, and around

The third pulse appearing on a line 32 for the beam generating system causes the line switch 18 to generate the blue signals 55 acceleration voltage. To be more precise lets through. With the fourth pulse begins the sequence have the grid 33 and the separate electrical anew, like the one in FIG. 1 shown Schwin connections for the grid 33, the luminescent screen supply trains, which are designated with red, green and blue 34 and the piston funnel lining 35 the purpose of a .are, show. Control of speed and point of impact

If you -1 do not correctly find the sequence of the color lines 60 of the electron beam for the different colors, is chosen, in which in the United States which are to be produced can allow. The dem The voltage supplied by America's 525-line raster with line screen 34 determines the color jump under certain circumstances a line flicker on the relevant line.

to step. It has been shown that the flicker effects originate from the voltage on the piston funnel lining 35

with a fixed line sequence are relatively low 65 of the high-span connected to this covering. In a fixed row system, the voltage line is 23 and held constant so that Time sequence in the first partial image red, green, blue, red, the electron beam in the deflection area of the picture tube green, blue, etc. In the second part the 20 change a constant speed and flawless

Shape The voltage at the grilles 33 comes from etoeVweUeren output terminal of the high voltage Xlteri 36 and serves to change the beam path Z rarbsäume to avoid or to cause convergence of the three color rasters. As shown in Fig. 1, TiS runs the other contact piece of the normally open contact 55 from the cathode of the image is connected to a terminal carrying a positive voltage + V (anode voltage). The coil 52, a resistor 53 and a diode 54 are connected in parallel to adjust the sensitivity , the latter is used to limit overvoltages,

Point of impact on the Lumi capacitor 56 against

rdeTC filters that between a terminal of the relay coil

to about 30 W 'on a first value over and ground The voltage V ₊ is Dis iioer ^{J "K} 7; ^u", "umecschaltet The 15 then a second through the primary winding of a transformer to a ^d" "" ^ _π? ^ £ a 57 fed to the anode of a thyristor 58. With a change in the ^ ^t ^ ^a ^^^ S £ ^^ a cathode of the thyristor 58, the anode is a corresponding change in the «^« escnwinaigjc _e rdiodc59 connected to the circuit

result, which ^{closes a ^ k} ^ J ^^ 2JÜS3i after mass. The connection between the substances is made possible with ^^^ SSS ^ b, > o the anode of the diode 59 and the cathode of the thyristor digkcit takes however ^ J ^ f ¹ ^, 58 is connected to + V via a resistor 60,

and the grid is correspondingly smaller. _{The control} , _{cktfode of the} thyristor is via the

To this undesirable effect ines to kompensier _{Sekundänvicklung e} pulse transformer 61 with

the voltage on the grid 33 is connected to a κοπμ ■ ^^, its primary winding as well

modulated menular tension. For the red aig _{one terminal is connected to ground} . _the

is the screen 34 drißste the "" and the grid "'5 ^ ^^ _{Klemmc PrimärwickIung the pulse} _ d * highest voltage is supplied. The beam veriau _i ii i A

then along the path 43. For ^ the.green ^ .gn the Sch.rm34 and *? Jf "J ™ Spannungm average values trains uhrt.Fu e ^ ^b ^ s signals has the voltage on the screen to jw. Sten and its grating 33 on the" Who '^ longest, and the beam follows the path 41 when ^Ul ™ ^c ™ 'of the tension on the screen 34 a so acai trajectories are changed so that the roic, um ^

coincide green grids. . .

The high-voltage switch 36 then supplies the three different high voltages for the screen 34 and the necessary ^s P '™ ^llin £ ^c , the cutter 33. The output voltage cies ^ ^c "' _d 36 is generated by a suitable ia ^ tor ^ -. K 3H ^ ' ^st """

^ _gp

_{transformer 6 is} i _m i _t an output of the ring ^ ^ coupled to and receives pulses

the beginning of the blue scanning sequence

to the
Lumin

ied by a suitable ia ^ to g ^ Ι. ·; ΐ by the stray capacitance 3H ^ ' ^st ";" _a " _ltat luminescent screen and Ma ^ e as well as oil '■ ·; *"' 37, which result from the parallel ^{combination of} the ^ taul J '''ity di-s grids and the parallel capacitance ^ac - ¹ ^ voltncswitch36 against Mas' ·· ¹ nesiim .> _ ^ Between. Η the grid electrode 33 mj-t "'' ^^ _so connected condc .sator 39, whose ^K " P * ''' _Π beme ih di

behave
the he !.

_{Connectivity zw} i _sc hen the anode of the thyristor ^ ^ _{Primarwicklun} g _{of the} transformer 57 _{is mU the anode of a} thyristor 62 _OTeiten gekop- ^ cathode of the thyristor 62 is connected via a

^ Resistor 63, which is connected to a capacitor 64, is connected to the other terminal of the primary winding ^ _{transformer 57} . The Thy-^^ ^ _{i2 associated} circuitry bridge _{thus} d e} primary winding of the transformer 57. The gate of the thyristor 62 is coupled across the secondary winding of a pulse transformer 65 with the connection between the capacitor and _the relay coil 5ί 52nd The primary winding of _the transformer 65 is connected between ground and an _{output of} the ring counter 24 (Fig. 1) and receives a pulse during the green lines.

The transformer 57 has a secondary winding which supplies a stepped-up voltage and _{is bridged with a} capacitor 68. The upper _K ] _{one of the} secondary winding of the transformer _g7 . _{& {} coupled to the luminescent screen electrode 34 of the picture tube 20 in Fig. 1, while the lower terminal is connected to the grid electrode 33 of the picture tube. A tap at the lower Kl d secondary winding d Tft

the er!. Mortal amplitude at the grid-w-.

des Sc, rmes 34 results. The above ^{lwscnn <} T'n. _ls , _cr _

lenkstc -rsystem enables cmc .S ¹ ^ ¹¹¹ JLc _08n .

deckunc. since the electron ^{beam> ntolg} ~: _'d f _c i _re bottom CLOSED gr

nnng to the funnel of the picture tube ^bec ^ '". _{ä |} . _{and 55} terminal of the secondary winding of the transformer

Shape and its small diameter 1peinc ι- ^^ ₅₇ a resistor 69 is a high

auBerd-m against magnetic stray waves π V lead Di V

wise unempnnaiicn intensity to be expected.

Fiο - »shows the circuit diagram of a Hochspannuis »Mo ~ r.11 Generating the high shear voltages with three different values for the sen '"' the grid 33 of the shown in Fig. 1

An Overload Protection Relay 50 uno «ic & ^ Pg 61 a Im

Necessary components are supplied in series with the _{pulse yom} ^ "^," 24 (Fig. 1). Here controlled silicon rectifier or lnyrr _ ^ _{durdl causes} an ignition pulse on the control electrode hlt ^^^ tj ^ d Thristor 58 of the dementsphd üdt d

₅₇ ch

_spa retr HV + supplied. The connection between _Sekundärw ^ i _c screen angle of the transformer 68 and

_{Resistor 69 is bridged} by a capacitor 70 ^ ^

The in F i g. Circuit arrangement shown operates 2 _{fo constricting rmaßen:} To ignite the thyristor 58 ^ primary winding of the transformer 61 is an import ^, 24 (

gn Sig
holding trigger circuit
fe h

52,

holding trigger circuit ^ rtj: ^ »^ 52, of Thy, phend ignites and

fortress protection relay SO contains a J "^ J. _mes current through the primary winding of the transformer

whose one terminal with a contact _{bag? to ground]} This connects + V to the normally open contact 55 of the relay 1 *.

_durd p control electrode

of the thyristor 58, which ignites accordingly and current through the primary winding of the transformer _{g? after mass] hereby} becomes + V to the

209 684 ^ 63

ίο

Primary winding of the transformer 57 is placed. The 68 is approximately 0 when the thyristor 62 blocks. The voltage + V is in the secondary winding of the now prevailing voltage level represents the tension transformer transformed up 57, and the con- voltage level is for the green line, wherein on the screen densator58 is on the stepped-up rake and the grid of the picture tube, the voltage + HV voltage charged, which is the high voltage + HV 5. The curves of the voltages resulting for the screen and the superimposed tue to the tap of the secondary winding grid are supplied in FIG. 2 via the resistor 69. shown. In the circuit described, when the capacitor 68 is fully charged, the generation of the three-stage. With only one oscillation, the primary current drops to a value that does not charge cycle, not two as previously required, so that more is sufficient to keep the thyristor 58 conductive, and only half the power is required so that it then blocks again. The voltage across the relay 50 prevents damage to the capacitor 68. It provides the excitation voltage for the thyristor 58 and the voltage source for V + in the blue phosphor which is fed to the screen electrode in the event that the secondary winding of the kinescope transformer. The grid electrode 33-57 is short-circuited and the thyristor 58 does not hold a voltage that the difference between the 15 can be blocked.

Voltage across the capacitor 68 and the high voltage.

voltage + HV corresponds. This tension will have been for a line-sequential one of its kind

On the other hand, however, the following voltages are used by a capacitor 37 on the operation. This

The grid electrode of the picture tube was divided, so that voltages on this resulted for the raw, green and blue

Electrode in effect such a compensation ao phosphor a good grid coverage and good HeIHg-

tension is the desired coverage of the speed.

blue grid results. Immediately after blocking __

of the thyristor 58, the capacitor 58 begins itself

through the secondary winding of the transformer 57 screen 34 I grid 33 j funnel 35

to discharge. About 53 (is later, which is roughly the same as ~~ ■ ^A '

corresponds to the duration of one line, the discharge red saturates

current from the capacitor 68 the core of the transform green

mators 57. The transformer 57 is namely blue

10.4 kV
16, ok
23.4 kV

16.56 kV 16.00 kV 15.26 kV

16 kV 16 kV 16 kV

saturable core made of a material with essentially

borrowed rectangular hysteresis loop The through the 30 The specified voltages depend on the

Capacitor 68 and the secondary winding of the structure of the penetration luminescent screen,

Transformer's specific discharge time constant has _the change in grid voltage bSgt S i ^

in the case of an unsaturated nucleus such a value that they mean, however, about 10% of the change in the image

Secondary current saturates the core in about 53 _{| tS.} shield voltage change in una

As a result of the saturation, the effective inductance of the transformer57 decreases. The reduced voltage according to FIG. 2, which has the above-mentioned step inductance of the transformer 57, forms together shaped voltages for the screen and that with the capacitor 68 form a resonance circuit, in the grid of the picture tube, from which the energy is rapidly transmitted Capacitor in the inductance of the secondary winding and back again 40 V + +200 V at 150 mA

is transferred to the capacitor so that the RpIqU ς ·? with ifnninii ic λ ι, _η * ,,, **. ""

Voltage across capacitor 68 reverses polarity. ^ ^{52> mt contact5} 5 A 410-061650-01

By reversing the polarity of the capacitor voltage ίήνς'Τΐ ''

voltage, the transformer 57 is desaturated, and the resistor 53 27Oh

Discharge time constant takes its origin again- 45 Resistance 60 1 ς irxh

borrowed value. In this state, the resistance is now 63 95 Oh

"Red" voltage level at the shield electrode 33 the resistor 69 fw!?, ^M

Penetron picture tube 22 applied. The grid voltage _v , ^ZMUhm

is higher because the voltage on capacitor 68 with £ ^on capacitor 56 n, 002 μΡ

same polarity in series of high voltage + HV so £ ^on <J ^en sator 64 0.18 μΡ

appears. Capacitor 68 70 pF.

From the capacitor 68 energy is further ^fed into the onaetor 70 500 _P F

Inductance of the secondary winding of the transformers 61 and 65 UTC United Transtors 57 transferred, and if you use the cycle former Co. would continue to run, the Trans- 55 # 51 Impulse transformer

saturate fonnatorkem, and the winding inductance transformer 57 g-L Electronics

would then go back to its low value. _{No. rT 1R11 A 4n19}

Before this occurs, however, the thyristor 62 or the toroidal core Pn-

by one via the transformer 65 from the ring mä'rwirfrlnna 100 'win-

zähler24 supplied »green« ignition pulse ignited- * o SKSÄ NrVS-

det The charge on capacitor 68 is 2440 during KdSwfcffine

of the return interval quickly via the transformer WinduTeen m 18

57 transferred to the capacitor 64. SS and 270 Wm-

When the charge transfer is complete, the thyristor 62 blocks with two electrodes. The values of _the 243g wind and resistance 63 and the capacitor 64 are _{chosen and the 2} J0 wins so that the residual voltage on the capacitor fertilizes

Claims (5)

1. Penetron color display tube with a Flask, which has a neck and a funnel that widens from this, an im Electron beam generating system arranged in the flask neck, one at the wide end of the piston funnel located luminescent screen, which by electrons of different Fjiergie for Emission of light of different colors and stimulable with one to the outside of the bulb performed electrical connection is verseben, one isolated from the luminescent screen electron-permeable grid electrode, which is essentially parallel to the luminescent screen runs and is arranged at a distance from this and with a: isolated from the luminescent screen conductive surface on the inner wall of the piston funnel between the jet generation system and the grid electrode, characterized in that the grid electrode (33) and the conductive surface (35) insulated from one another and each with their own to the outside the piston carried out electrical connections are provided. 2. Color image reproducing device for a Penetron - dye! '^ display tube according to claim 1 and with a color switching voltage source connected to the luminescent screen, characterized in that the grid electrode (33) with a source (j6) for a Color switching voltage on the luminescent screen (34), complementary grid registration error compensation voltage and that the conductive surface (35) is connected to a source of a substantially constant voltage. 3. Color image display device according to claim 2, wherein the luminescent screen of Penetron color display tube contains green, red and blue emitting phosphors, thereby characterized in that the bias applied to the conductive surface (35) is substantially equal the voltage is that when the green-emitting phosphor on the luminescent screen is excited located. 4. color image reproducing device according to claim 2 or 3, characterized in that the amplitude of the grid misregistration compensation voltage about 10%> is the amplitude of the color switching voltage. 5. color image reproducing device according to claim 2 or 4, characterized in that the source (36) for the raiter registration error compensation voltage contains a capacitive voltage divider. 5 ^ un