JP2000023177A - Beam index display - Google Patents

Abstract

(57) [Summary] [Problem] Even when one CRT screen is composed of a plurality of divided screen display areas, colors stable in each screen display area are not affected by other screen display areas. Provided is a beam index display device capable of performing a switching process and improving display quality. SOLUTION: An index start detecting unit 12 for detecting that beam scanning has entered each screen display area based on an index signal in a display area detected and received, and a first color to be displayed in each screen display area in advance. An initial color setting unit 14 for setting is provided to control a timing for generating a color switching timing signal, and to control an input video signal (R, G,
Since the color switching processing of B) is performed, it is possible to detect the start point of each screen display area and set the start color in the display image of each screen display area, and to set the color of the image display of each screen display area. Switching processing can be performed stably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam index display device using a color cathode ray tube (CRT) of a beam index type, and more particularly to a beam index display in which one CRT screen is composed of a plurality of continuous screen display areas. Related to the device.

[0002]

2. Description of the Related Art At present, color cathode ray tubes widely used as color television receivers include a shadow mask type and a modified trinitron type. As another method that has been put to practical use, there is a beam index type.

[0003] The beam index type color cathode ray tube is
There is no shadow mask or aperture grill, and color selection is performed by index phosphor stripes, and color display is realized by one electron beam. Since the electron beam utilization rate is high, it has high brightness, is resistant to vibration, and is less susceptible to terrestrial magnetism.

FIG. 5 shows a principle diagram of a beam index type color cathode ray tube. A red R, green G, and blue B phosphor 22 is applied on the inner surface of the glass panel 21 in a vertical line (vertical stripe), and a substance that generates an optical signal at regular intervals, for example, a phosphor ( Hereinafter, an index phosphor 24 is formed in a vertical linear shape (vertical stripe) so as not to overlap with the R, G, B phosphors 22, and an optical signal (electron signal) generated when the electron beam is horizontally scanned. Hereinafter, the beam index signal) is received by the photodetector 27,
Detects the timing position of the electron beam in the horizontal scanning direction,
At the same time, the colors of the R, G, and B signals to be placed on the electron beam are selected. That is, in the color cathode ray tube, the RGB primary color signals are dot-sequential based on the beam index signal obtained by scanning the electron beam, and are given to one electron gun 26 to be supplied to one electron gun 26 by one electron beam. A color image is realized by sequentially irradiating the image.

FIG. 6 shows an example of the structure of a fluorescent screen in a beam index type color cathode ray tube. On the inner surface (electron gun side) of a glass panel 21, R and R constituting a display section (effective screen) are formed. The G and B phosphor stripes 22 are sequentially and repeatedly arranged at a predetermined pitch P1 (trio pitch of the R, G and B stripes) in the scanning direction of the electron beam via the carbon black stripes 23, respectively.

A start index section is provided on the side of the horizontal scanning start section outside the display section. This start index portion also has a predetermined pitch P2 with respect to the electron beam scanning direction.
And the index phosphor stripes 24 are repeatedly arranged. Index phosphor stripe 2
Reference numeral 4 also indicates that the display section is also repeatedly arranged at the same pitch P2. Reference numeral 25 is a metal layer such as aluminum.

The index phosphor stripe 24 has an R
It is formed in order to detect the timing of switching of GB, and is formed, for example, at three pitches in two trios of the RGB phosphor stripe 22. In synchronization with the timing of a beam index signal generated by irradiating the index phosphor stripe 24 with an electron beam, a color signal to be mounted on one electron beam is switched for each of R, G, and B. As a result, the dot-sequential R, G, B signals are placed on one electron beam and irradiated on the corresponding RGB phosphor stripes 22 to display a color image.

A conventional video display apparatus using a beam index signal has one screen display area as shown in FIG. 7, and a starting point of color switching of video display is provided on the horizontal scanning start side outside the display area. Is set, and an index in the display area for color switching of color image display is formed in the screen display area in the same manner. In the case of such a single screen configuration, since there is only one screen display area, a clear start index area could be set outside the screen.

However, in a video display device in which a plurality of continuous screen display areas are set, each of the screen display areas is an index area of a neighboring display screen. A dedicated start index area cannot be provided for each display area,
In addition, there is a problem that the display signal is affected by the index signal of the adjacent display area. For this reason, stable color switching processing cannot be performed in each screen display area, and it is necessary to separate the area for each display screen.

[0010] In addition to a video display device having a plurality of screen display areas, even in a single-screen video display device, the start index is similarly affected by the structure of the screen surface and the internal structure of the side surface. May not be provided.

[0011]

As described above, for example, 1
In a video display device in which one screen is composed of a plurality of screen display areas, it is not possible to provide a start index portion for setting a start point of color switching, and a stable color switching process is performed in each screen display area. There was a problem that can not be.

In view of the above, the present invention has been made in view of the above problem. Even when one CRT screen is composed of a plurality of divided screen display areas, the CRT screen is not affected by other screen display areas. Provided is a beam index display device capable of detecting an index signal by display scanning in each screen display area, performing stable color switching processing in each screen display area, and improving display performance. The purpose is to:

[0013]

Means for Solving the Problems The first invention is claim 1.
As described in, one continuous screen display area
When three CRT screens are configured and each screen display area is beam-scanned, the primary color signals of red, blue, and green are sequentially subjected to color switching processing based on the index signal, and mounted on one electron beam. , A beam index display device for irradiating blue, green and green phosphors to display a color image, provided in each of the screen display areas, for generating an index signal in the display area by beam scanning. Means, index signal reception detection means for receiving and detecting the index signal in the display area, and an index for detecting that beam scanning has entered each screen display area based on the detected index signal in the display area. Start detection means, initial color setting means for previously setting the first color to be displayed in each screen display area, and each screen display area (A) generating a timing signal for sequentially switching colors to be displayed, and performing color switching in each screen display area. Color switching control processing means for generating a timing for displaying the first color of the display area, and thereafter sequentially performing color switching in a predetermined order for the three colors based on the index signal in the display area. It is characterized by the following.

In the first invention, when one CRT screen is composed of a plurality of continuous screen display areas,
By detecting the start point of each screen display area, it is possible to set the start color in the display image of each screen display area, and it is possible to stably perform the color switching processing of the image display of each screen display area. . Alternatively, it is possible to stably perform the color switching processing of the video display of the intended predetermined screen display area. In each screen display area, stable color switching processing can be performed without being affected by other adjacent screen display areas.

According to a second aspect of the present invention, when the screen display area is beam-scanned, the primary color signals of red, blue and green are sequentially switched based on the index signal. A beam index display device for displaying a color image by irradiating red, blue, and green phosphors on a single electron beam, and provided in the screen display area;
A display area index signal generating means for generating a display area index signal by beam scanning; an index signal reception detecting means for receiving and detecting the display area index signal; and An index start detecting means for detecting that beam scanning has entered the screen display area, an initial color setting means for previously setting a first color to be displayed in the screen display area, and a color to be displayed in the screen display area. A color signal is switched by generating a timing signal for sequentially switching, and a timing for displaying the first color set by the initial color setting means is generated by a start detection signal from the index start detection means, and thereafter, Predetermined for three colors based on the index signal in the display area Those characterized by comprising a color switching control processing means for sequentially color switching in the order, the.

In the second invention, not only when one CRT screen is constituted by a plurality of continuous screen display areas, but also in the case of a single screen screen display area, the start index is set outside the display area. Even if there is no section, it is possible to detect the start point in the display image of the screen display area and set the start color in the display image of the screen display area, and stably perform the color switching process of the image display of the screen display area. It can be carried out.

[0017]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a beam index display device according to an embodiment of the present invention. FIG. 2 is a diagram showing a screen display area of a CRT screen of the beam index display device having a plurality of divisions. FIG. 3 is a diagram showing an index signal generating means in a screen display area having a continuous screen configuration.

First, referring to FIGS. 2 and 3, a screen display area having a plurality of divisions will be described. In FIG. 2, the video display screen is composed of a plurality of divided screen display areas, and the continuous divided screen display areas are areas A, B, and C, and an area B at the center position of the three screen display areas is shown. An example is described below.

FIG. 3 shows the arrangement of indices in the display area in each of a plurality of continuous screen display areas A, B, and C when the divided screen display area B is viewed from the center position. .

As described above, since the adjacent area is continuous to the left and right with respect to the area B, it is possible to provide a dedicated start index portion outside the screen display area as shown in the single screen configuration example of FIG. Instead, the outside of a predetermined screen display area (for example, area B) is a display area of another screen.

The beam index display device having such a continuous plural-screen configuration shown in FIG. 3 will be described with reference to FIG.

In FIG. 1, reference numeral 11 denotes an index signal (index signal in a display area) a1 obtained by receiving and detecting a beam index signal generated by beam scanning by an index signal reception detecting means (not shown) including a photodetector. An input terminal; an index signal a1 guided to the input terminal 11;
Is input to the index start detection unit 12 and is input to the color switching timing control unit 13.

The index start detecting section 12 detects that the beam scanning has entered each screen display area (for example, B), and detects a timing signal b1 for starting color switching. To detect that the beam scanning has entered the screen display area B, for example, the screen display areas A, B, C,... And the beam index signal obtained based on the index in the display area when the beam scanning is performed. This can be performed by counting the number of pulses (the number of index phosphor stripes) and detecting whether or not the first index of the screen display area B has been reached. Alternatively, by removing the index located at the boundary between the screen display area A and the screen display area B, the beam index signal of the beam index signal can be obtained when the screen display areas A, B, C,. It can be performed by detecting that the screen display area B has been entered by detecting the lack.

The initial color setting section 14 sets the first color to be displayed in each screen display area in advance. It is preferable to set the same color as the first color in advance for each screen display area, but it is also possible to set a different color as the first color in each screen display area.

The color switching timing control section 13 waits in a state where the color for starting color switching is reset to the initial color set in advance by the initial color setting section 14, and the index start detecting section 12 detects the color. The timing at which the first color of each screen display area is displayed is generated by the start signal b1, and the timing at which the three colors are sequentially switched in a predetermined order based on the index signal a1 is generated. It is sent as a color switching control signal to the subsequent color switching processing unit 15 to perform color switching timing control.

The color switching processing unit 15 switches the primary color signals of R, G, and B input to the input terminals 16a, 16b, and 16c according to the color switching timing signal supplied from the color switching timing control unit 13 in the preceding stage. , To the video signal output unit 17 in the final stage.

The color switching processing unit 15 switches the input video signals of the R, G, and B input signals in accordance with the color switching order controlled at the timing from the previous stage, and converts the input video signals into a single video signal. The image signal is output as a video signal e1 in which RGB color signals are superimposed by division. Video signal e
Reference numeral 1 denotes a video signal obtained by converting the R, G, and B signals into dot sequences.

The color switching timing control unit 13 and the color switching processing unit 15 generate a timing signal for sequentially switching colors to be displayed in each screen display area, and perform a color switching process in each screen display area. Means.

The final stage video signal output section 17 performs the output processing of the RGB video signal superimposed on the above-described one system, and outputs the processed video output signal from an output terminal 18. The output RGB dot-sequentialized video signal is supplied to an index type color cathode ray tube (CRT) (not shown), and is irradiated with an electron beam onto an RGB phosphor stripe.

In such a configuration, since the index start detecting unit 12 and the initial color setting unit 14 are provided, when one CRT screen is composed of a plurality of continuous screen display areas, each screen display area , It is possible to set the start color in the display image of each screen display area by detecting the start point of the screen display area, and it is possible to stably perform the color switching processing of the image display of each screen display area. Alternatively, it is possible to stably perform the color switching processing of the video display of the intended predetermined screen display area. In each screen display area, stable color switching processing can be performed without being affected by other adjacent screen display areas.

It should be noted that, in the present invention, as shown in FIG.
The screen is not limited to the case where the T screen is composed of a plurality of continuous screen display areas, but is the case of a screen display area having a single screen configuration without a start index as shown in FIG. 4 or a single screen configuration in which the start index part is deleted in FIG. Even in the case of, it is possible to detect the start point in the display image in the screen display area and set the start color in the display image in the screen display area, and to stabilize the color switching process of the image display in the screen display area. Can be done.

[0032]

As described above, according to the present invention, when one display screen is composed of a plurality of continuous screen display areas, an index of another screen display area exists in an adjacent screen display area. In this situation, it is possible to set the starting color of the display image by detecting the processing start point of the predetermined screen display area, perform a stable color switching process by the index signal for each screen display area, and improve the quality of video display. Can be realized. Alternatively, the same effect can be obtained even when one display screen is constituted by a single screen without a start index.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a beam index display device according to an embodiment of the present invention.

FIG. 2 is a view for explaining a screen display area having a plurality of divided configurations on a CRT screen of the beam index display device.

FIG. 3 is a view for explaining an arrangement of indexes in a continuous display area of a multi-screen display area configuration.

FIG. 4 is a view for explaining an arrangement configuration of indexes when there is no adjacent display area;

FIG. 5 is a perspective view illustrating the principle of a beam index display device.

FIG. 6 is a sectional view showing a fluorescent screen structure of a beam index type color cathode ray tube.

FIG. 7 is a view for explaining the arrangement of indexes in a conventional single-screen beam index display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Index signal input terminal 12 ... Index start detection part 13 ... Color switching timing control part 14 ... Initial color setting part 15 ... Video signal color switching processing part 16a, 16b, 16c ... R, G, B signal input terminal

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 31/20 H01J 31/20 EF term (Reference) 5C036 DD05 DD22 5C060 AA01 BA02 BA07 BB02 BC01 BD03 CA01 FA01 FB08 FC06 FD01 FE02 JA20 5C082 AA02 AA34 BA34 BB03 BC06 BC07 BD01 MM01

Claims (2)

[Claims] 1. A single C in a plurality of continuous screen display areas.
When an RT screen is configured and each screen display area is beam-scanned, primary color signals of red, blue, and green are sequentially subjected to color switching processing based on an index signal, and are mounted on one electron beam. A beam index display device for irradiating blue and green phosphors to display a color image, provided in each of the screen display areas, and generating an index signal within the display area by beam scanning. Index signal reception detection means for receiving and detecting the index signal in the display area; and index start for detecting that beam scanning has entered each screen display area based on the detected index signal in the display area. Detecting means, initial color setting means for previously setting the first color to be displayed in each screen display area, and each screen display area A timing signal for sequentially switching colors to be displayed is generated to perform color switching in each screen display area, and each screen display set by the initial color setting means by a start detection signal from the index start detection means. Color switching control processing means for generating a timing for displaying the first color of the area, and thereafter sequentially performing color switching in a predetermined order for three colors based on the index signal in the display area. Characteristic beam index display device. 2. When scanning a screen display area with a beam, red, blue, and green primary color signals are sequentially subjected to color switching processing based on an index signal, and are mounted on one electron beam.
A beam index display device for irradiating blue and green phosphors to display a color image, provided in the screen display area, and generating a display area index signal by beam scanning. Index signal reception detection means for receiving and detecting the index signal in the display area; and index start detection means for detecting that beam scanning has entered the screen display area based on the detected index signal in the display area. An initial color setting means for setting a first color to be displayed in the screen display area in advance; and a timing signal for sequentially switching colors to be displayed in the screen display area and performing color switching, and According to the start detection signal from the start detection means, the initial color setting means Color switching control processing means for generating a timing for displaying the first color, and thereafter sequentially performing color switching in a predetermined order for three colors based on the index signal in the display area. Beam index display.