KR100830972B1 - Cathode ray tube - Google Patents

Abstract

In the multi-neck beam index type cathode ray tube that can improve screen resolution and shorten the electric field, accurate indexing drive and dark current can be reduced without installing a separate mechanical barrier on the left and right boundary inside the cathode ray tube. By providing a cathode ray tube to improve the contrast. The cathode ray tube includes a face panel, a funnel, and a tube composed of first and second necks; First and second electron guns respectively mounted inside the first and second necks to individually scan fluorescent screens into respective first and second regions; At least two or more kinds of index phosphors alternately arranged on the black matrix; At least two or more types of photo detectors provided on the outer surface of the funnel in pairs corresponding to the first and second regions; And an index signal processing apparatus, wherein the index phosphors alternately arrange different kinds of index phosphors along the scanning direction of the electron beam in the first and second regions of the fluorescent screen, and the index signal processing apparatus includes the first and second index phosphors. The same kind of photodetectors provided corresponding to the regions are switched to drive each other.

Cathode ray tube, beam index, multi neck, photo detector, fluorescent screen, index phosphor, index signal processing device

Description

Cathode Ray Tube {CATHODE RAY TUBE}

1 and 2 are schematic diagrams of a fluorescent screen among cathode ray tubes according to the prior art, and an index signal waveform according to the fluorescent screen configuration, respectively.

3 is a partially enlarged view of a fluorescent screen.

4 is a cross-sectional view of a cathode ray tube according to an embodiment of the present invention.

5 is a partially enlarged cross-sectional view of the fluorescent screen shown in FIG. 4;

6 is a partially enlarged cross-sectional view of a fluorescent screen according to another embodiment of the present invention.

7A and 7B are schematic diagrams of an index signal processing apparatus and an index signal waveform according to the first embodiment of the present invention, respectively.

8A and 8B are schematic diagrams of an index signal processing apparatus and an index signal waveform according to a second embodiment of the present invention, respectively;

The present invention relates to a cathode ray tube, and more particularly, to a so-called multi-neck beam index type cathode ray tube having two or more necks for one face panel while color separating an electron beam using an index signal.                         

A beam index type cathode ray tube, which is a kind of cathode ray tube, is composed of a face panel, a funnel, and a neck tube like a normal cathode ray tube, but an electron gun that emits a single electron beam is mounted inside the neck. Index phosphors are further formed together with a fluorescent screen consisting of R, G, and B phosphors, and outside the funnel, a deflector and a photo detector for sensing index light are mounted.

With the above configuration, the beam index type cathode ray tube detects the scanning position of the electron beam through the index signal obtained from the light emission of the index phosphor in the electron beam scanning process, and controls the scanning position of the electron beam based on this position information to correspond to the electron beam. By reaching the R, G, B phosphors, a predetermined color image is realized.

In this case, in order for the beam index type cathode ray tube to realize a high resolution screen, the R, G, and B phosphors should be arranged at a fine pitch, and correspondingly, the index phosphors should also be arranged at a fine pitch.

However, as shown in FIG. 1, when the pitches of the index phosphors 1 become small, the index signals overlap due to the afterglow of the index phosphors _1, which reduces the signal amount S ₁ , and makes it difficult to distinguish the index signals. You won't be able to.

On the other hand, a method of increasing the index signal amount by increasing the intensity (L) of the index light has been proposed, but in this case, the current of the black level electron beam, which is continuously scanned to emit the index phosphor 1, aka dark current is increased to increase the power of the screen. This has the disadvantage of lowering the contrast in the area.                         

In addition, as shown in FIG. 2, when the interval between the index phosphors 1 is increased, the index signal amount S ₂ can be increased by effectively reducing the overlapping portions of the index signals, but in this case, the index frequency is lowered so that the image signal is reduced. As it affects the screen, luminance smudge may appear on the screen.

Therefore, the current beam index type cathode ray tube allows accurate indexing driving while arranging R, G, and B phosphors and index phosphors at a fine pitch, thereby improving the screen resolution and lowering the dark current to improve the screen contrast. I have a problem.

In the related art, Japanese Patent Application Laid-Open No. 54-109724 discloses a beam index type receiving tube having two types of index lines having different fluorescence spectral distributions and two types of photoelectric conversion elements corresponding to each index line. Japanese Patent Laid-Open No. 6-165193 discloses a beam index type receiving tube having two types of index lines and two types of light receivers, and a delay, adder, and subtractor for index signal processing.

Further, Japanese Patent Laid-Open No. 2000-3348 discloses a beam index type receiving tube having three or more kinds of index phosphors having different light emission energy and / or light emission wavelengths, and a plurality of light receivers corresponding to each index phosphor.

The above-mentioned prior arts have two or more types of index phosphors and a light receiver, and each of them provides a technology for preventing overlapping of signals by processing an index signal by a circuit method such as addition, subtraction, and delay.

However, in order to apply the method proposed by the above-mentioned prior arts to the multi-neck beam index type cathode ray tube like the present invention to smoothly drive the indexing, the left and right boundary surfaces of the screen must be completely blocked by a mechanical barrier wall. If the left and right screens are not blocked, the indexing drive cannot be made correctly because of the interference of the index light from the opposite side.

Therefore, the present invention is to solve the above problems, an object of the present invention is to enable accurate indexing drive without installing a separate mechanical barrier wall in the left and right boundary inside the cathode ray tube, and to improve the contrast by reducing the dark current To provide a cathode ray tube that can be made.

In order to achieve the above object, the present invention,

A face panel formed with a fluorescent screen in which a plurality of green, blue, and red phosphors are repeatedly arranged on an inner surface thereof, a funnel having a first neck and a second neck coupled to the rear of the face panel; First and second electron guns respectively mounted inside the neck and alternately scanning one-stage electron beams along respective first and second scanning directions in the first and second regions of the fluorescent screen, and alternately at predetermined intervals on the black matrix; At least two types of index phosphors arranged in a pair, at least two types of photo detectors provided on the outer surface of the funnel corresponding to the first and second regions, at least two types of photo detectors corresponding to each index phosphor, and at least two obtained from the photo detectors An index signal processing apparatus for generating a final index signal by synthesizing more than one kind of index signal,

Different types of index phosphors are alternately arranged along the first and second scanning directions of the electron beam in the first and second regions of the fluorescent screen, and the index signal processing apparatus is provided corresponding to the first and second regions. The present invention provides a cathode ray tube for switching and driving the same kind of photo detectors.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a cross-sectional view of a cathode ray tube according to an exemplary embodiment of the present invention, and FIG. 5 is a partially enlarged cross-sectional view of the fluorescent screen shown in FIG. 4.

As shown in the drawing, the cathode ray tube is integrally coupled with a funnel 8 having two necks 4a and 4b and two cone portions 6a and 6b behind the face panel 2 to form a tube 10 of the cathode ray tube. The inside of the tube 10 maintains a high vacuum state of about 10 ⁻⁷ to 10 ⁻¹⁰ torr so as to allow electrons to move freely.

In the set circuit portion of the cathode ray tube (not shown), the index signals obtained by the action of the electron beams occurring inside the tube 10 are synthesized, and the synthesized index signals are synchronized with the R, G, and B color signals, and the current density and the degree of deflection of each electron beam. An index signal processing device (not shown) for controlling the Equation is provided.

More specifically, the inner surface of the face panel 2 is a fluorescent screen 16 composed of a black matrix 12 and a plurality of R, G, B phosphors 14 repeatedly arranged between the black matrix 12. In particular, first and second index phosphors In1 and In2 each having a unique emission wavelength or emission energy are alternately arranged one by one on the black matrix 12 at regular intervals.

In one example, three first and second index phosphors In1 and In2 are arranged for four sets of R, G, and B, respectively, and the fluorescent screen 16 generally includes three index phosphors for each of two sets of R, G, and B. Equipped.

In addition, first and second electron guns 18a and 18b are mounted inside the respective necks 4a and 4b to emit a single electron beam toward the fluorescent screen 16, and a deflection magnetic field is provided outside the respective cone parts 6a and 6b. The 1st, 2nd deflection apparatus 20a, 20b which generate | occur | produces is provided.

In addition, the first photodetector 22 corresponding to the emission wavelength or the emission energy of the first index phosphor In1 and the second photodetector 24 corresponding to the second index phosphor In2 have their respective necks 4a. , 4b) are installed in pairs on the left and right or on the corners of the outer surface of the funnel 8, respectively.

In this case, the first and second photodetectors 22 and 24 may use other kinds of materials selectively corresponding to specific emission wavelengths or emission energies, or one type of integrated ones may be used. In addition, a filter corresponding to the emission wavelength of each index phosphor may be attached to the first and second photodetectors 22 and 24.

As a result, the electron beams emitted from the first and second electron guns 18a and 18b are deflected by the magnetic field generated by the deflecting devices 20a and 20b to separately scan the left and right regions of the fluorescent screen 16. Each electron beam is simultaneously horizontally scanned toward the screen boundary from the beginning of the effective screen in the left and right regions. (In the drawing, the scanning direction of the electron beam is indicated by an arrow.)

In the electron beam scanning process, the first and second index phosphors In1 and In2 emit respective index lights, and the first and second photodetectors 22 and 24 sense the corresponding index light to the index signal processing apparatus. When the output signal is supplied, each electron beam is color-separated into the corresponding R, G, and B phosphors 14 through the control of the index signal processing apparatus.

Thus, as the present embodiment includes two electron guns 18a and 18b for one fluorescent screen 16, the fluorescent screen 16 and the electron guns 18a and 18b are compared with the conventional cathode ray tube having one electron gun. The distance (depth) between them is shortened, and the size of the scanning area that one electron gun is responsible for is reduced.

Therefore, this embodiment can reduce the current of the electron beam emitted from each electron gun 18a, 18b by approximately 50% compared to the conventional beam index type cathode ray tube having one electron gun, so as to realize the same brightness. The spot size of the electron beam can be effectively reduced.

Accordingly, the present embodiment secures the optimal electron beam spot size according to the above configuration so that the R, G, B phosphors and the index phosphors are arranged even though the R, G, B phosphors and the index phosphors are arranged at a fine pitch. Accurate light emission facilitates high resolution realization and enables accurate indexing drive.

Furthermore, the present embodiment follows the index phosphors to exclude mutual interference by the index light generated respectively in the left and right regions when the two electron beams separately scan the left and right regions of the fluorescent screen 16. Arrange as follows.

That is, the first and second index phosphors In1 and In2 are alternately arranged at regular intervals, and the scanning of each electron beam is performed so that the same kind of index phosphors do not emit light at the same time in two electron beam scanning processes. Different types of index phosphors alternately along the direction.

For example, in the case of FIG. 5 using two kinds of index phosphors, the first, second, first, second, and second .. screens in the left region of the fluorescent screen 16 extend from the beginning of the effective screen to the screen boundary along the electron beam scanning direction. Index phosphors are arranged in order, and in the right region of the fluorescent screen 16, second, 1, 2, 1, ... index phosphors are arranged in order from the beginning of the effective screen to the screen boundary along the electron beam scanning direction. do.

In this embodiment, as shown in FIG. 6, three types of index phosphors having different emission wavelengths or emission energy levels may be used. In this case, the electron beam scanning direction is changed from the beginning of the effective screen in the left region of the fluorescent screen 16. 1, 2, 3, 1, 2, 3, ... index phosphors are arranged in sequence up to the screen boundary, and in the right region of the fluorescent screen 16, the screen boundary along the electron beam scanning direction from the beginning of the effective screen. The third, one, two, three, one, two ... index phosphors are arranged in order.

The arrangement of the above-described index phosphors is not limited to the above-described embodiment, and different types of index phosphors are alternately arranged along the electron beam scanning direction in the left and right regions of the fluorescent screen 16 regardless of the number of index phosphors. In this case, the same kind of index phosphors inside the tube 10 can be suppressed from simultaneously emitting light.

In addition, in this embodiment, when two electron beams separately scan the left and right areas of the fluorescent screen 16, the same kind of photodetectors are simultaneously operated for the left and right areas of the fluorescent screen 16 at the same time. In addition, the function of mutually switching the photo detectors is added to the index signal processing apparatus.

7A is a schematic diagram of an index signal processing apparatus according to a first embodiment of the present invention, in which the index signal processing apparatus is connected to the photo detectors D1 (L) and D2 (L) provided corresponding to the left region of the fluorescent screen, It is electrically connected to the photo detectors D1 (R) and D2 (R) provided corresponding to the right area of the fluorescent screen.

At this time, the photodetectors D1 (L) and D1 (R) sense the index light of the first index phosphor In1 in the left and right regions, respectively, and the photodetectors D2 (L) and D2 (R) respectively detect the left, right, The index light of the second index phosphor In2 is sensed in the right region.

First, when the first index phosphor In1 emits light in the left region of the fluorescent screen, the index signal processing apparatus operates the photo detector D1 (L) provided in the left region to sense the index light, and at the same time, the control signal It is transmitted to the photo detector D1 (R) provided in the right region to stop the operation of the photo detector D1 (R).

On the contrary, when the first index phosphor In1 emits light in the right region of the fluorescent screen, the photodetector D1 (R) in the right region is operated and the photodetector D1 (L) provided in the left region by a control signal. Operation is stopped. As a result, the two photodetectors D1 (L) and D1 (R) sensing the index light of the first index phosphor In1 operate while switching with each other.

As described above, in order to sense the index light of the second index phosphor In2, two photo detectors D2 (L) and D2 (R) respectively provided in the left and right regions of the fluorescent screen are also operated while switching with each other.

Therefore, the present embodiment effectively prevents mutual interference of index light by preventing the same kind of photo detectors sensing the index light of the same wavelength when the electron beam simultaneously scans the left and right regions of the fluorescent screen 16. .

Furthermore, in the present embodiment, in addition to switching the same type of photodetectors respectively provided in the left and right regions, the index signal processing apparatus applies a 1/2 retarder, an adder, a subtractor, etc. to further increase the signal amount. Get the waveform.

FIG. 7B is a schematic diagram of an index signal waveform according to the configuration of the index signal processing apparatus shown in FIG. 7A.

As shown in Figs. 7A and 7B, the index signal processing apparatus delays the index signals a and b by the light emission of the first and second index phosphors In1 and In2 by one-half cycle, respectively, and thus the index signals a 'and b. 'Adds first and second delayers 26 and 28', index signals a and b 'to add first signal 30 to output index signal c, and index signals a' and b to add index A second adder 32 for outputting the signal d and a third adder 34 for outputting the final index signals S1 (L) and S1 (R) for adding the index signals c and d are further provided.                     

The first and second delayers 26 and 28 and the first to third adders 30, 32, and 34 are applied in the same configuration to the left and right regions of the index signal processing apparatus, and the final output is performed through the delay and adders. Both the index signals S1 (L) and S1 (R) represent a waveform in which the frequency and the signal amount S3 are increased by two times compared to the initial index signals a and b.

8A and 8B are schematic diagrams of an index signal processing apparatus and an index signal waveform according to a second embodiment of the present invention, respectively.

As shown, the index signal processing apparatus outputs index signals a 'and b' by delaying the index signals a and b by the light emission of the first and second index phosphors In1 and In2 by one-half cycle, respectively. A second adder (30, 28), a first adder (30) for adding the index signals a and b 'to output the index signal c, and a second adder for outputting the index signal d by adding the index signals a' and b '. And two subtracters 32 and a subtractor 36 which subtracts the index signals c and d to output the final index signals S2 (L) and S2 (R).

The first and second delayers 26 and 28, the first and second adders 30 and 32, and the subtractor 36 are also applied to the left and right regions of the index signal processing apparatus in the same configuration. The index signals S2 (L) and S2 (R), which are finally output through the subtractor, represent waveforms in which the signal amount S3 is increased by four times compared to the initial index signals a and b.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, according to the cathode ray tube of the present invention, the spot size of the electron beam can be reduced in comparison with the conventional beam index type cathode ray tube having one electron gun, and accurate indexing driving is provided through the index signal processing apparatus provided by the present invention. This becomes possible. Therefore, the high resolution can be easily realized, and as the index signal waveform with the increased signal amount is obtained, the dark current can be lowered to improve contrast in all areas of the screen.

Furthermore, the cathode ray tube according to the present invention does not need to separately consider physical means such as a blocking wall or circuit blocking means in order to block the influence of index light generated on the left and right screens of the fluorescent screen. And to simplify the configuration of the index signal processing apparatus.

Claims (10)

A face panel having a fluorescent screen in which a plurality of green, blue, and red phosphors are repeatedly arranged on an inner surface of the black matrix; A funnel coupled to the rear of the face panel and having first and second necks; First and second electron guns respectively mounted in the first and second necks and individually scanning one electron beam in the first and second scanning directions in the first and second regions of the fluorescent screen; Two or more kinds of index phosphors alternately arranged on the black matrix at predetermined intervals; Two or more kinds of photo detectors provided on the outer surface of the funnel in pairs corresponding to the first and second regions and corresponding to the respective index phosphors; And An index signal processor for synthesizing two or more types of index signals obtained from the photo detectors to generate a final index signal, The first region and the second region of the fluorescent screen respectively arrange the two or more kinds of index phosphors in different patterns so that different kinds of index phosphors emit light at the same time along the first and second scanning directions. , The index signal processing apparatus transmits a control signal to an optical detector of the same type provided corresponding to the second or first region during operation of any one photo detector provided corresponding to the first or second region. Cathode ray tube for stopping the operation of the photo detector. The method of claim 1, And the first and second electron guns simultaneously horizontally scan a line of electron beams along the screen boundary where the first and second areas contact each other from the beginning of the effective screen of each of the first and second areas. The method of claim 1, And a cathode ray tube comprising two kinds of first and second index phosphors having different emission wavelengths or emission energy. The method of claim 3, wherein And a cathode ray tube comprising two kinds of first and second photo detectors corresponding to the first and second index phosphors. The method of claim 3, wherein The first and second index phosphors are arranged in order along the first scanning direction in the first region of the fluorescent screen, and the second and first indexes along the second scanning direction in the second region of the fluorescent screen. Cathode ray tube in which phosphors are arranged in sequence. The method of claim 1, A cathode ray tube comprising three kinds of first, second and third index phosphors having different emission wavelengths or emission energy. The method of claim 6, The first, second and third index phosphors are arranged in order in the first scanning direction in the first area of the fluorescent screen, and in the second area of the fluorescent screen in the third, Cathode ray tubes in which 1 and 2 index phosphors are arranged in sequence. delete The method of claim 4, wherein The index signal processing apparatus corresponding to the first and second regions, First and second retarders outputting index signals a 'and b' by delaying the index signals a and b by the light emission of the first and second index phosphors by a half cycle; A first adder for adding the index signals a and b 'to output an index signal c; A second adder for adding the index signals a 'and b to output an index signal d; And And a third adder for adding the index signals c and d to output the final index signals S1 (L) and S1 (R), respectively. The method of claim 4, wherein The index signal processing apparatus corresponding to the first and second regions, First and second retarders outputting index signals a 'and b' by delaying the index signals a and b by the light emission of the first and second index phosphors by a half cycle; A first adder for adding the index signals a and b 'to output an index signal c; A second adder for adding the index signals a 'and b to output an index signal d; And And a subtractor for subtracting the index signals c and d to output the final index signals S2 (L) and S2 (R), respectively.

Images