JPS6113789A - Line sequential beam index color receiver - Google Patents

Abstract

PURPOSE:To prevent the occurrence of color blurring by forming a pattern obtained by burying a space between index stripes with the same type of index member as the index stripe and initializing color information for modulating an electron beam by a detection signal when an electron beam is applied to the pattern. CONSTITUTION:Stripe-like metallic electrodes are provided between fluorescent stripes R, G and B, and connected at every other electrode each other, thereby forming index strips I1 and Ib. For instance, a pushing part X made of the same member as the stripe Ib are provided at the left side from a center with respect to fluorescent stripes 2' and 3. Consequently, for instant when an electron beam b3 draws near to the pushing part X at the time of scanning the stripe 3, a detection output from the stripe Ia goes to zero, while a detection signal from the stripe Ib goes to a maximum value. Thus, the electron beam b3 is tracking- controlled upward, and stabilized because it is tracked to the previous fluorescent stripe 2. At this time, a pulse-like control signal can be obtained from a differential circuit as shown in the figure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a line-sequential beam index color receiver in which color reproduction is performed by sequentially modulating an electron beam with color information called a field for each scanning line.

BACKGROUND TECHNOLOGY AND PROBLEMS The so-called line-sequential beam index color receiver has three components: red (R), edge (G), and blue (as shown in Figure 2).
The phosphor stripes (B) are repeated in sequence in the vertical direction, and between each phosphor stripe (R) (G) (B) a first index stripe (Ia) and a second index stripe (Ib) are provided. ) are provided alternately.

Then, the electron beam is sequentially modulated by color information that repeats in the order of red, blue, and green for each horizontal scan, and the first
In the field, the electron beam is sequentially tracked to the phosphor stripes indicated by ■, ■, ■... in the figure, and in the second field, the electron beam is tracked sequentially to the phosphor stripes indicated by ■, ■, ■......
・Sequentially track the fluorescent stripes indicated by .

This reproduces a color image.

In this apparatus, the tracking of the electron beam to each of the phosphor stripes described above is performed, for example, by the circuit shown in FIG. Here the index stripe (Ia) (
Ib) is formed of metal electrodes connected to each other every other stripe, or of a material that emits light of different wavelengths depending on the electron beam, and a signal is generated when each stripe is irradiated with the electron beam.

This signal is transmitted to the detection means (2a) provided in the picture tube (11).
) (2b) through the detection circuits (3a) and (3b). This extracted signal is used as a switch (
4a) is supplied to the differential circuit (5) through (4b).

Depending on the field, switch (4a) (4b)
By switching the stripe (Ia) (Ib)
The signal from is reversed.

The control signal from the differential circuit (5) is then supplied to a deflection circuit (6) for vertical auxiliary deflection or main deflection, and the signal from this deflection circuit (6) is transmitted to the vertical deflection aperture of the picture tube (11). the law of nature(
7), and for example, when there are many signals from stripe (Ia) in the first field, upper stripe (1b
), the vertical deflection position is corrected in one direction. Further, in the second field, the opposite correction is performed.

Tracking of the electron beam is performed in this manner.

Furthermore, in this device, color information is supplied as follows. That is, the three primary color signals from the decoder circuit (8) are supplied to the switching circuit (9), and the signals extracted for each horizontal scan in the order of red, blue, and green, for example, are supplied to the picture tube (1).

As a result, color information is supplied line-sequentially.

However, in this case, the receiver's screen may move upward due to the influence of the earth's magnetic field, and for example, a predetermined number of horizontal scanning lines after vertical synchronization may not always track to the same phosphor stripe. .

Therefore, conventionally, for example, a pattern as shown in Fig. 2 is provided on the index stripes that sandwich the phosphor stripes marked ■' and For example, (9) is initially set to green in the first field and red in the second field.

That is, when the above-mentioned patterns are provided, when an electron beam passes between the patterns, a signal having a frequency corresponding to the interval between the patterns and the scanning speed of the electron beam is superimposed on the control signal. . Therefore, a signal of this frequency is detected by a detection circuit (-), and this detection output is supplied to a switching circuit (9) to perform initial setting.

However, in this case, in order to obtain high frequency components that do not affect normal tracking control,
The pitch of the pattern must be made quite fine, and it is extremely difficult to form an index stripe with such a pattern.

Furthermore, as a detection circuit, it is necessary to provide a filter for extracting the above-mentioned frequency components, a comparator for determining the level thereof, etc., resulting in the problem that the configuration of the detection circuit αω becomes complicated.

OBJECTS OF THE INVENTION In view of the above points, the present invention has a simple structure and allows for easy identification of a desired phosphor stripe.

SUMMARY OF THE INVENTION The present invention provides predetermined index stripes at arbitrary intervals between stripes of phosphor of each color extending horizontally and repeating sequentially in the vertical direction. Detects the wavering electron beam, uses this detection signal to correct the vertical position of the electron beam, and corrects the vertical position of the index stripe of the same type adjacent to the part of the index stripe located at the top of the screen. A pattern is formed in which spaces are filled with index members of the same type, and the detection signal described in 1- above when the electron beam is applied to this pattern is used to initialize color information for modulating the electron beam. This line-sequential beam index color receiver is characterized by the following: According to the line-sequential beam index color receiver, a desired phosphor stripe can be easily identified with a simple configuration.

Example In FIG. 1A, each phosphor stripe (R) (G) (
Between B), a striped metal electrode is provided, and every other metal electrode is connected to each other to form a first index stripe (Ia) and a second index stripe (Ib). . For example, for the phosphor stripes (■' and ()), a push-in part (X) formed of the same material as the index stripe (Ib) is provided on the left side of the center.

Therefore, in this device, for example, when the phosphor stripe is being scanned in the first field, the electron beam b
When the index stripe <Ia) becomes 0, the detection signal from the index stripe (Ib) becomes the maximum value. For this reason, the electron beam b3 is trunked upward and stabilized by being trunked to the previous phosphor stripe ■, but at this time, the differential circuit (5) generates a pulse as shown in FIG. A control signal like this is obtained.

Furthermore, at the time when the phosphor stripe ■' is being scanned in the second field, the electron beam b2' is similarly ejected from the buried portion (X
), the detection signal of the stripe (Ia,) becomes 0,
The detection signal of the stripe (Ib) reaches its maximum value, so that the electron beam b2' is trunked in the direction of
Stabilization is achieved with the next phosphor stripe (■'), and a pulse-like control signal similar to that described above can be obtained.

Therefore, in the above-mentioned device, the level of the control signal from the differential circuit (5) is determined by, for example, a comparator. 8, and this discrimination signal can be used to initialize the switching circuit (9).

In this way, the desired phosphor stripe is determined, and according to the above-mentioned apparatus, pattern formation is extremely easy because only the embedded portion (X) is provided in a part of the index stripe.

Furthermore, since the discrimination signal can be easily obtained by the comparator, the configuration of the detection circuit α becomes simple. Furthermore, the first and second
Since discrimination can be performed in any field, color settings can be made for each field, and there is no fear of color misalignment between fields.

``This makes it possible to prevent color shift from occurring when the screen moves up and down due to the earth's magnetic field.

The embedded part (X) of the index stripe is provided at the top edge of the screen, but the vertical position of the electron beam is stable for the first few lines, and the tracking control is not stable at the left edge of the screen, so these are stabilized. Place it in an appropriate position.

In the above example, the first and second index stripes made of metal electrodes are provided, but in the case of using an optical index made of one type of light emitting substance, for example, the arrangement is as shown in FIG. 4.

In the figure, the electron beam is tracked so that a portion thereof covers the optical index (shaded area), and is controlled so that constant light emission is always obtained from the optical index. In this device as well, when the optical index reaches the embedded portion (X) made of the same material, tracking control is performed to the adjacent phosphor stripes, and at this time, a pulse-like control signal is generated.

Therefore, using this control signal, the determination can be made in the same manner as described above.

Effects of the Invention According to the present invention, it has become possible to easily identify a desired phosphor stripe with a simple configuration.

[Brief explanation of the drawing]

``Figure 1 is a block diagram of an example of the present invention, Figures 2 and 3 are Figure 9 for explaining a conventional device, and Figure 4 is a block diagram of another example of the present invention. (R) (G) (B) is a phosphor stripe, (Ia) (I
b) is the index stripe, (X) is the embedded part, 0ω
is the detection circuit.

Claims (1)

[Claims] Predetermined index stripes are provided at arbitrary intervals between the phosphor stripes of each color that are extended in the horizontal direction and repeated sequentially in the vertical direction, and the electron beam applied to these index stripes is detected and this detection signal is transmitted. to correct the vertical position of the electron beam, and to form a pattern in which spaces between the index stripes of the same type adjacent to a portion of the index stripes located at the top of the screen are filled with index members of the same type; A line-sequential beam index color receiver characterized in that the detection signal obtained when the electron beam is applied to the pattern is used to initialize color information for modulating the electron beam.