KR970004315B1 - Time division for color picture tube - Google Patents

Abstract

A time divisional scanning type of a color CRT is disclosed. The color CRT comprises a single electron gun(200) for receiving a RGB cathode voltage and for generating an electron beam; a deflection yoke(201) for deflecting the electron beam to a predetermined position; and a screen(202) for displaying the image according to the sequence of the deflected electron beam.

Description

Time-division injection

1 is a schematic configuration diagram of a conventional color receiver.

FIG. 2 is an enlarged cross-sectional view showing the electron gun of FIG. 1 in more detail.

(A) is a cross-sectional view of an R, G, B electron gun,

(B) is a longitudinal cross-sectional view of an R, G, B electron gun.

3 is an enlarged cross-sectional view of the FIG. 1 screen in more detail.

4 is a voltage waveform diagram applied to the cathode of FIG.

(A) is the voltage waveform applied to the R cathode,

(B) is voltage waveform applied to G cathode,

(C) is a voltage waveform diagram applied to the B cathode.

5 is a configuration diagram of the time-division scanning color water tube of the present invention.

FIG. 6 shows the single electron gun of FIG. 5 in more detail.

(A) is a cross-sectional view of a single electron gun,

(B) is a longitudinal sectional view of a single electron gun.

7 is an enlarged cross-sectional view of the FIG. 5 screen in more detail.

FIG. 8 is a voltage waveform diagram invisible to the cathode of FIG.

9 is a diagram of voltage waveforms applied to the R, G, B metal strips of (a) to (c) of FIG.

* Description of the symbols for the main parts of the drawings *

200: single electron gun 200a: single heater

200b: single cathode 200c-200f: first to fourth grid

201: deflection yoke 202: screen

203 neck 202a-202g metal strip

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube characterized by time-division scanning by a single electron gun, and in particular, to improve beam focusing by a single electron gun and to induce beam induction by time-division scanning and R, G, B strip voltages synchronized thereto. The present invention relates to a time-division scanning color receiving tube which emits G, B phosphors sequentially to prevent doming and screen shaking due to heat and vibration of S / M, astigmatism caused by deflection yoke, and to obtain high resolution.

As shown in FIG. 1 of the prior art collar tube, the R, G, and B electron guns 100, 101 and 102 are formed to accelerate, focus, and scan the R, G, and B electron beams. A deflection yoke 103 for deflecting the R, G, B electron beams scanned by the R, G, B electron guns 100, 101, 102 in the horizontal and vertical directions, and horizontally by the deflection yoke 103; A shadow mask 104 having a plurality of holes 104a for guiding vertically deflected electron beams of R, G, and B to the phosphor, and electron beams of R, G, and B through the holes 104a of the shadow mask 104 And a screen 105 for emitting and displaying phosphors.

In the above, each of the R, G, B electron guns 100, 101, 102 is the first to third heaters 113 to 115 that generate heat by the input voltage, as shown in FIG. R, G, B cathodes 110, 111, 112, and the R, G, B cathodes 110, which emit hot electrons in the oxides plotted on the surface by the heat generation of the third heaters 113 to 115; The main lens by accelerating the first grid 116 to control the R, G, B electron beam emitted from the (111) (112), and each of the R, G, B electron load controlled by the first grid 116 The second grid 117 incident on the second grid, the third grid 118 focusing the R, G, and B electron beams incident through the second grid 117, and the third grid 118 focuses on the third grid 118. The fourth grid 119 accelerates the adjusted R, G, B electron beams and impinges the R, G, B phosphors 105a, 105b, and 105c of the screen 105 through the shadow mask 104. It is.

In the above-described screen 105, R, G, and B phosphors 105a, 105b and 105c are uniformly arranged and applied to the pantel 105d as shown in FIG. A graphite strip 105e is applied between the B phosphors 105a, 105b and 105c, and an aluminum film (B) between the graphite strip 105e and the R, G and B phosphors 105a, 105b and 105c. 105f) is deposited, and reference numeral 123 in the figure denotes the neck of the electron gun, 199 'is the cylindrical electrode of the fourth grid 119, and 120 to 122 are the third and fourth grids 118 and 119. R, G, B apertures formed in

In this way, the conventional color image tube constructed as described above first applies a voltage to each of the first to third heaters 113 to 115 of the R, G, B electron guns 100, 101, 102 connected in parallel. The first to third heats 113 to 115 generate heat to heat the respective R, G, and B cathodes 110, 111, and 112 at a high temperature of about 1000 ° K.

The R, G, B cathodes 110, 111 and 112 are heated by a high temperature of about 1000 ° K generated in the first to third heaters 113 to 115 and coated on the surface thereof. Hot electrons in the BaO main component).

The emitted R, G, B electron beams are generated in a field formed by voltages applied to the R, G, B cathodes 110, 111, 112, and the first and second grids 116, 117. Thereby accelerating towards the screen 105.

That is, in the general case, the voltage applied to the first grid 116 is 0V, and the voltage of the second grid 117 is applied several hundred volts (200 to 900V), and each of the R, G, and B cathodes 110 is applied. (111) 112 is applied to a voltage of about several tens to 100V differently to adjust the current beam amount of each of the R, G, B to implement the brightness and color.

That is, as shown in (a) (b) and (c) of FIG. 4, if the time period for emitting one pixel is Tp, R, G, and B cathodes for determining the color and luminance of one pixel during Tp time. The voltages V1, V3, V5 of the woods 110, 111, 112 are determined and applied, and then the signal voltages V2, V4, V6 for the next pixel are applied for the next Tp time. The beam arrival position is moved by the signal of the deflection yoke 103 synchronized therebetween.

The R, G, B electron beams emitted from the R, G, and B cathodes 110, 111, and 112 by the voltage are controlled by the first grid 116 to adjust the amount of current beams to the second grid 117. Enter

R, G, and B adjusted in the first grid 116 are weakly focused in a prefocus lens formed between the second grid 117 and the third grid 118 and the third and fourth grid 118. Accelerated by the main lens formed by 119 is focused to a point on the screen 105.

In the above, the voltage of the third grid 118 is thousands of volts (V), and the voltage of the fourth grid 119 is applied several tens of KV, so that the kinetic energy of each current beam is shown in FIG. R, G, and B phosphors 105a, 105b, and 105c are made to emit light through the aluminum film 105f on the top surface to give the required luminance and color.

On the other hand, three beams formed from the three R, G, B electron guns 100, 101, 102, that is, R, G, B electron beams, are disposed at predetermined positions on the screen 105 by the deflection yoke 103. The light emitting phosphor emits phosphor at the position, and the beams of R, G, and B are separated by a predetermined distance from the screen 105 to guide the R, G, and B phosphors 105a, 105b, and 105c. There is a need for shadow mask 104 installed in place.

The shadow mask 104 has small grooves 104a for passing the electron beam, so that the R, G, B electron beams deflected by the deflection yoke 103 are near the hole 104a of the shadow mask 104. Cross-passing causes the R, G, and B phosphors 105a, 105b, and 105c on the screen 105 to emit light.

The electron gun used for the color receiving tube is a third electron gun that forms and focuses R, G, and B beams. In general, the shape of an inline type 3 electron gun as shown in (a) and (b) of FIG. It is.

The resolution of the screen 105 is closely related to the connectivity of the R, G, and B electron guns 100, 101, 102, and the like.

That is, the object point and divergence angle determined in the beam forming region including the R, G, and B cathodes 110, 111, 112, and the first and second grids 116, 117, and the third, third, The size of the electron beam formed on the screen 105 is determined by the focusing performance of the main lens formed between the four grids 118 and 119.

This will be described in detail with reference to (a) and (b) of FIG. 2, and the beam spot size Dt on the screen 105 is determined by the water spot size (dx) and the magnification (M) of the main lens in the beam shape region. The spot size (Dx), the electron beam diffusion component (D _SA ) due to the spherical aberration of the main lens, and the diffusion component (Dsc) due to the mutual repulsive force between electrons are expressed by the following equation.

Therefore, when the magnification, which is the basic line parameter of the electron gun, is determined by the specification of the color receiving tube, it is possible to obtain a small spot size, that is, a high resolution, by reducing the spherical aberration and the electron mutual repulsive force. It is well known that it should be enlarged.

However, in the conventional color receiver, as shown in (b) of FIG. 2, it can be seen that there are the following limitations in order to enlarge the pore diameter of the main lens.

First, the main lens pore diameter (r) of the independent circular R, G, B apertures (120, 121, 122) is determined by the aperture (R) and the beam depth (S) of the nac 123. In order to expand the lens diameter under such a restriction, the aperture R of the net 123 must be enlarged, but this has the disadvantage of increasing the deflection power (Power) of the deflection yoke (103).

Second, as shown in (b) of FIG. 2, a method of using asymmetric apertures instead of the independent circular R, G, and B apertures 120, 121, and 122 is introduced, but the limitation thereof is also introduced. And, there is a disadvantage that astigmatism occurs due to the use of an asymmetric aperture.

On the other hand, when the electron beam generated from the electron gun passes through the shadow mask 104, about 80% of the amount of current hits the wall of attention of the hole 104a of the shadow mask 104, so that the efficiency of emitting the actual phosphor is not only low, but also the shadow mask. There is a disadvantage in that the screen characteristics are degraded by doming due to heat generation.

In addition, in order to collect the beams of R, G, and B bones formed in the 3-electron gun at one point on the screen, a convergence free magnetic field must be used in the deflection yoke or a separate independent convergence yoke can be used. When used, a new aberration decreases due to astigmatism, and when the convergence yoke is used, there is a problem such as an increase in manufacturing cost due to a separate fabrication and circuit configuration.

Accordingly, an object of the present invention is to sequentially emit light of R, G, and B phosphors by time-division scanning of an electron beam by a single electron gun and beam induction by applying R, G, and B strip voltages synchronized thereto. It is to provide a time-division scanning color picture tube that obtains a high resolution by changing one pixel.

Another object of the present invention is to arrange the R, G, B phosphors alternately in the form of a horizontal band and to sequentially emit the R, G, B phosphors every 1/3 cycle of the horizontal scan signal time to obtain horizontal line pixels at once. It is in a ship.

As a means for achieving the object of the present invention, to form and focus the electron beam by applying the R, G, B cathode voltage required to form the pixel for a certain period to obtain a pixel having one color and brightness, The present invention is accomplished by a screen showing an image by a temporal sequence of a single electron gun for accelerating, a deflection yoke for deflecting the electron beam generated by the single electron gun to a predetermined position on the screen, and the electron beam deflected in the deflection yoke, and the present invention will be described below. When described in detail based on the accompanying drawings as follows.

5 is a block diagram of the time-division scanning color receiver of the present invention. As shown in FIG. 5, the phosphors of R, G, and B are emitted in a temporal order to obtain a pixel having a single color and luminance. A single electron gun 200 for forming, focusing, and accelerating an electron beam by applying the R, G, and B cathode voltages required to form the pixel, and deflecting the electron beam generated by the single electron gun 200 to a predetermined position on a screen. The deflection yoke 201 and the screen 202 which represent an image by the temporal order of the electron beam deflected by the said deflection yoke 201 in synchronization with the said R, G, B cathode voltages are comprised.

In the above, the single electron gun 200, as shown in Figure 6, each of the single heater (200a) that generates heat by the input voltage, and the hot electrons in the oxide plotted on the surface by the heat of the single heater (200a) The main lens by accelerating a single cathode (200b) for emitting light, a first grid (200c) for controlling the electron beam emitted from the single cathode (200b), and a battery beam controlled in the first grid (200c) Accelerate the second grid 200d incident to the second grid, the third grid 200e focusing the electron beam incident through the second grid 200d, and the electron beam focused on the third grid 200e. And the fourth grid 200f impinges the R, G and B phosphors 200, 200b and 200c of the screen 202 in the order of time.

In the above-described screen 202, the R, G and B phosphors 202a to which the photosensitive hardener is added to the panel 202h so as to solidify when the screen is exposed to light, as shown in FIG. (202b) and 202c are uniformly arranged and applied, and each of the R, G and B phosphors 202a, 202b and 202c is coated with a non-conductive all around strip 202d, and each of the R and The metal streams 202e, 202f, and 202g are vertically disposed on the top surfaces of the G and B phosphors 202a, 202b, and 202c, and are independent of each of the metal strips 202e, 202f, and 202g. The lead wire is connected to apply the high voltage of the R, G, B phosphors 202a, 202b, and 202c in synchronization with the voltage of the single cathode 200b. In the drawing, reference numeral 203 denotes a neck and 200g. Is a single aperture of the single electron gun 200.

Thus, the operation and effect of the present invention configured as described in detail with reference to Figures 5 to 9 as follows.

First, when a voltage is applied to the single heater 200a of the single electron gun 200, the single heater 200a generates heat to heat the high temperature roll single cathode 200b of about 1000 ° K.

The single cathode 200b is heated by a high temperature of about 1000 ° K generated by the single hit 200b to emit hot electrons in an oxide applied to an oxide surface applied to the surface thereof.

The emitted electron beam is accelerated toward the screen 202 by a field formed by the voltage applied to the single cathode 200b and the first and second grids 200c and 200d, and the accelerated electron beam is deflected yoke 202. After being deflected to a predetermined position on the screen, each of the R, G, and B phosphors 202a, 202b, and 202c emits light in a temporal order to obtain one color pixel.

Specifically, as shown in (a) and (b) of FIG. 6, the single electron gun 200 of the present invention has the same beam forming and focusing principle as the conventional three electron gun, but in a constant net 203 ground, The single aperture (i.e. main lens aperture) 200g that can be implemented is more than twice as large as a three-electron gun, resulting in less aberration, resulting in high quality focused beam spots.

That is, the period of the voltage applied to the single cathode 200b of the single electron gun 200 becomes Tp / 3 as shown in FIG. 8 by time division, and the R, G, B cathodes in the period Tp / 3. Voltage is applied and the order is (V1, V2,) (V3, V4), (V5, V6).

Here, Tp is a time period for emitting one pixel.

That is, as shown in FIG. 8, the R cathode voltage V1 is applied to the single cathode 200b to determine the color and luminance of one pixel at a period of Tp / 3, and then G for 1 / 3Tp time. The cathode voltage V3 is applied to the cathode voltage V5 for 1/3 Tp hours, and then R, G, and B cathode voltages corresponding to one pixel are applied for the entire Tp time.

As such, when R, G, and B cathode voltages V1-V6 are applied to the single cathode 200 b in the order of Tp / 3, 2Tp / 3, Tp, 4Tp / 3, 5Tp / 3, and 2Tp, respectively. In the single cathode 200b, beams corresponding to R, G, and B are determined and emitted, respectively.

The R, G, and B electron beams emitted by the time division from the single cathode 200b are adjusted by the voltage of the color signal applied to the first grid 200c to enter the second grid 200d.

R, G, and B controlled by the first grid 200c are weakly focused through the second grid 200D and the third grid 200e, and are controlled by the third and fourth grids 200e and 200f. The main lens formed is focused to a point on the screen 202.

In the above, the voltage of the third grid 200e is thousands of volts (V), and the voltage of the fourth grid 200f is several tens of KV.

On the other hand, the R, G, B electron beam formed by time division in the single electron gun 200 is deflected to a predetermined position on the screen 202 by the deflection yoke 201 to emit the phosphor at the position. Metal strips 202e, 202f and 202g disposed vertically on the upper surfaces of the R, G and B phosphors 202a, 202b and 202c of the screen 202 and connected by independent leads, respectively. When R, G, B cathode voltages are applied in synchronization with the R, G, B cathode voltages, the beam currents of the R, G, B cathode voltages are then R, G, B phosphors 202a, 202b ( By causing 202c to emit light in time order, a pixel having one color and luminance is finally obtained for every Tp period, and a pixel having the following color and luminance is obtained at 2Tp time.

The insulating strip 202d coated on the panel 202h of the screen 202 is made of a black material and has a high light absorption rate, and has a characteristic of reducing contrast and external light reflection.

In another embodiment of the present invention, the R, G, and B phosphors 202a, 202b, and 202c applied to the screen 202 are alternately arranged in a horizontal band shape, and every 1/3 cycle of the horizontal scan signal time. The R, G and B phosphors of the screen 202 may be sequentially emitted to obtain one calarin in three R, G and B lines.

As described in detail above, according to the present invention, a deflection yoke, a single electron gun, and a large-diameter lens (single aperture) having a uniform magnetic field characteristic considering only screen distortion without using convergence are used, so that the design of the deflection yoke is easy. Of course, high resolution can be realized by improving beam focusing performance. Also, by not using a shadow mask, doping due to thermal deformation, manufacturing cost and process complexity, and screen shaking due to mechanical vibration can be prevented and high brightness can be obtained. have.

Claims (4)

In order to obtain a pixel having a single color and brightness, a single electron gun for forming, focusing, and accelerating an electron beam by applying the R, G, and B cathode voltages required to form the pixel during a predetermined period, and the electron beam generated from the single electron gun A time-division scanning color water tube comprising a screen for displaying an image by a temporal order of a deflection yoke deflecting to a predetermined position on a screen and an electron beam deflected in the deflection yoke. 2. The screen of claim 1, wherein the screen is disposed on the upper surface of the applied R, G, and B phosphors in a vertical direction, and an independent lead wire is connected to each of the metal strips, thereby providing A time-division scanning color water tube, characterized in that the voltage is applied so as to be sequentially synchronized at a predetermined cycle. 3. The time division scan color receiver of claim 2, wherein the predetermined period is one third of the cathode voltage period. The relationship between the cathode voltage period Tp and the voltage period Tp applied to the R, G, and B phosphors according to claim 1 or 2 A time-sharing injection collar award hall, characterized in that it is periodically motivated to become.