SU1058089A1 - Colour television receiver - Google Patents

Abstract

A color television receiver containing a high-frequency unit, the first output of which is connected to the input of the soundtrack unit, the second output of which is connected through a scanner to the deviation input of a cathode ray tube (CRT) whose control input is connected to the second output of the scanner, the third output of the high-frequency unit I is connected via a brightness unit to the input of a chromaticity unit, the control input of which is connected to the fourth output of the high-frequency unit, while the selector is located in front of the CRT screen and, consisting of a translucent electrode connected to a common power busbar in series and parallel to the CRT screen, on which there are N groups of three translucent stroke electrodes, respectively, with photoluminophores of three primary colors, about 100 and and so that, in order to simplify the device by eliminating the delay unit, the switch is color-coded. There is a dividing unit, the three CO inputs of which are connected to the three outputs of the chromaticity block, and three outputs are connected to the three inputs of the chromaticity selector, and the divider divider input is connected to the second output , a block of S and a second control input of a CRT, made in the form of a single beam kinescope. sd 00 o 00 with

Description

The invention relates to a television / in particular to a color television (TV) receiver including single-path kinescopes. A well-known color TV receiver contains a high-frequency unit, the first output of which is connected to the input of the audio accompaniment unit, the second output is connected through the scanner to the deflection input electron-beam; tubes (CRT) of the type of single-beam chromatron, a third of the output of the high-frequency block is connected to the input of a chrominance unit, three outputs of which are connected to the trag inputs of the color signal switch, the output of which is connected to a control electrode of a CRT, and the control input is connected to the control input of the switch dashed stripes, the output of the ifoToporo is connected to the input of the color control grid tQ. However, the clarity of a color TV image reproduced on the screen of a single-way chromatron depends on the control frequency of the switches, which is usually equal to twice the frequency of the color subcarrier. This leads to high power consumption in the switching circuit as well as the impossibility of achieving high purity of color and clarity. The closest in technical essence to the present invention is a color TV receiver containing a high-frequency unit, the first output of which is connected to the input of the soundtrack unit, the second output of which is connected through the scanner, to the CRT deviation input of the multi-path black-white kinopop type, whose control input is connected to the second output of the scanner, the third output of the high-frequency block is connected through successively connected luminance block, chromaticity block, color signal switch and delay block The control signals of the CRT, while the control input of the color switch of the signal switch is connected to the output of the control pulse generator and the control input of the switch strip lines, the three outputs of which are connected to the inputs of a color selector located in front of the screen of the CRT and consisting of serially and parallel to the screen A CRT of an electrode connected to a common power line of a ferroelectric plate, onto which M groups of three translucent stroke electrodes are applied, respectively, from a photo pyuminophore and the three primary colors. However, the known device is complicated, since it contains a block of delays, two switches and a driver for controlling pulses, a CRT, the value of which determines the cost of a color TV receiver, is still complex because it contains three electrode spotlights. The purpose of the invention is to simplify the device by excluding a delay unit, a color signal switch, a dashboard switch, and a driver for controlling pulses. To achieve this goal, a color TV receiver contains a high-frequency unit, the first output of which is connected to the input of the soundtrack unit, the second output of which is connected through the scanner to the deviation input of the electron, but-ray tube (CRT) control input of which is connected to the second output -, the house of the scanner, the third output of the high-frequency block is connected through the brightness unit to the input of the color block, the control input of which is among-. . It is equipped with the fourth output of the high-frequency unit, while in front of the CRT screen there is a color selector consisting of sequentially and parallel to the translucent electrode located in front of the EDT screen, connected / common to the common power rail and a ferroelectric plate, on which there are N groups of E three translucent dashed electrodes, respectively, with photoluminophores of three primary colors, a dividing unit was introduced, three inputs of which are connected to three output blocks of a chromaticity, and three outputs are connected to three inputs of a village There is a chroma, the input of the divider of the dividing unit is connected to the second output of the luminance unit and the second control input of the CRT, made in the form of a single-beam kinescope. The drawing shows a structural electrical circuit of a color TV receiver. The receiver contains a high frequency unit 1, a sound accompaniment unit 2, a sweep unit 3, a single-beam kinescope type 4 cathode ray tube, a brightness unit 5, a chroma block b, a chroma selector 7, a translucent electrode 8, a ferroelectric ceramic plate 9, three groups of translucent bar electrodes 10, photoluminophores 11 primary colors and a block 12 divisions. The time after the luminescence of the phosphor coating of a single-beam kinescope should not exceed the times equal to the particular time divided from the forward stroke of the horizontal scanning by the number of translucent strokes of the ix electrodes in each of the groups of one of the primary colors. Failure to do so reduces the resolution

horizontal ability. The afterglow time of photoluminescent phosphor 11 should not be less than the half-scan time, since non-fulfillment of this condition leads to an increase in the stroboscopic effect of the demonstration.

The device works as follows

From the first output of the high-frequency block 1, the audio subcarrier enters block 2, where it is converted into a sound signal. From the second output of the high-frequency block 1, the clock frequency of the lines is passed through the scanner unit 3 to the corresponding deflection inputs of the CRT 4, on the screen of which the TV raster image is formed. The mixture of damping pulses is fed to another input of block 4 from the second output of block 3.

The electron beam of a CRT 4 is modulated by a luminance signal, delivered to the control input of unit 4 from the output unit 5 of luminance, and a TV image of the luminance signal is formed on the screen of a single-beam kinescope. The brightness of the TV raster at any point on the CRT 4 screen is constant. Due to the considerable time of the afterglow, the moving beam of the CRT 4 should be followed by an afterglow plume that does not exceed three iirins (for three-color kinescopes) near a number of translucent stroke electrodes of different colors, taking into account the intervals between zimi.

At the same time, from the third output of the high-frequency block 1, through the luminance block 5, the block signal is fed to the input of the chrominance block 6. In it, the TV luminance signal is converted into simultaneous color signals of green (G), red (K and blue C) using synch pulses from the fourth output of high-frequency unit 1. From the output of block 6, the color siggs enter the inputs of block 12, simultaneously the luminance signal enters the input of the divider of division 12, where amplitude normalization of the color signals occurs, which are fed to the inputs of the color selector 7. The dividing signals of the primary colors matched in amplitude with the inputs of the chroma selector, and the black level of each of the signals of the primary colors correspond to a complete attenuation of the transmission of the ferroelectric plate

9 between the corresponding translucent stroke electrodes

10 and a translucent electrode 8, and the maximum signal of this primary color corresponds to the maximum transparency of the ferroceramic plate 9 in the indicated areas.

As a result, under the influence of electric fields upragl guides between groups translucent bar electrodes 10 and translucent electrode 8 in the plate 9 are formed segnetokeramicheskoy transparency windows which are transparent moduli0 Rowan amplitude signals of primary colors, and TV raster excite glow photoluminescent 11. Spectral characteristics of fluorescent dyes radiation fotolyumino5 For 11 for improving the quality of color reproduction are selected identical with the spectrum characteristics of Soviet phosphors s K-75, K-74 and K-77, employed for color television picture tubes with maxima

0 emissions are 450, -540 and 610 nm, respectively. The phosphor coating of the CRT 4 screen has a radiation maximum at 425 nm. This ensures the operation of the luminescent coating of the screen and the photoluminescent phosphors 11 in the visible range of light radiation with maximum efficiency while eliminating the danger of ultraviolet irradiation of the eyes of the audience in the event of

0 partial destruction of photoluminophore. ditch 11, and also eliminates the need to use special types of glasses that are transparent to ultraviolet in single-beam CRTs.

5 radiation.

The invention provides for reproducing a color TV image with a resolution of 625 lines in a frame for each of the main colors without loss of resolution horizontally, which is determined by the number of groups of light-transmitting dashed electrodes. The screens of 61 cm diagonally can be

 not less than 600 lines provided

each of the primary colors at 100% pure color. All other things being equal, the brightness of a color image is equal to or, due to an increase in the resulting area of the phosphor coating on a TV screen, 10-25% higher than the brightness of a color TV image on a three-beam kinescope screen. At the same time the mode of operation of the kinescope and various isgikeni in individual

Its 5 nodes and blocks, for example, distortion of the raster of the distortion type, have practically no effect on the purity of the colors of the reproduced television image and on the static balance over

0 white color.

In addition, color videturglnalnye devices - displays that worked in conjunction with electronic digital computers (computers), types of SP computers, are greatly simplified.

and EC computers. The latter is provided as follows. Practically in all types of color video-cooling devices of the module 1 and the general luminance signal is provided with one bit of binary code - the rated current of the beam corresponds to one, its absence - to zero. The brightness values of each of the primary colors for each of the points displayed are also coded with one code bit, i.e. 10 a modulation of both the primary color signal and the luminance signal is set only according to the Nyoshich Signal principle or the absence of it. Moreover, the luminance signal is present 5 in the presence of any of the carrier colors encoded for a given raster point. The latter circumstance greatly simplifies the invention if the primary color signals are fed directly from a color video terminal device interface to a computer to the control inputs of a color selector without additional yellow-color converters, the primary color is constant. This value, which in this case is the luminance signal, is proportional to the qcHOfeHoro color signal itself. The proportionality coefficient in this case is given by the matching inverter ohm instead of block 12 division, which, for the exception of: oibing and increasing the purity of the color due to the luminance signal and the primary color signals, can be made as a luminance signal by element b.

Thus, the playback of the TCP eliminates the high-frequency switches at the control input of the kinescope modulator, the color selector commutator, and all control units.

In the proposed design of a television receiver, the technical implementation of color television receivers is simplified in comparison with known designs as element-wise switching of carrier colors, as well as line-wise switching (although the latter have a 3-fold lower vertical resolution ability).

The quality of color rendition is significantly improved without any reduction in other parameters as compared to TV and receivers, both on single-beam and multi-path kinescopes, for example, mask ones.

Claims (1)

A color television receiver containing a high-frequency unit, the first output of which is connected to the input of the soundtrack unit, the second output of which is connected through a scan unit to the cathode ray tube (CRT) deflection input. The control input of which is connected to the second. the output of the scanner, the third output of the high-frequency block is connected | through the brightness unit to the input of the color block, the control input of which is connected to the fourth output of the high-frequency block, while a color selector is located in front of the CRT screen, consisting of a translucent electrodes connected in series and parallel to the CRT screen, connected with a common power bus, and a ferroceramic plate, on which N groups of three translucent bar-shaped electrodes are applied, respectively, with three phosphors new colors, characterized in that, in order to simplify the device by eliminating the delay unit, the switch of color signals. of pulses, dashed strip switch t, and control pulse shaper, a division block is introduced, three inputs of which are connected to three outputs of a color block, and three outputs are connected to three inputs of a color selector, and the input of the divider of the division block is connected to a second output, brightness unit and the second control input of the CRT, made in the form of a single-beam tube, ι