KR830000077B1 - Color tv receiver - Google Patents

Abstract

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Description

Color tv receiver

1 to 3 are diagrams showing an index stripe method of a color water pipe of a beam index method.

4 is a schematic diagram of an embodiment of a color television receiver according to the present invention;

5 is a partial schematic of FIG.

6 is a waveform diagram at the time of operation of FIG.

The present invention relates to a color television receiver using a beam receiver type color receiver.

The color index tube of the beam index method scans the red, green, and blue color phosphor stripe fluorescent surfaces in which a single electron beam is sequentially arranged in the horizontal scanning direction. An electron beam is generated by scanning the index phosphor stripe, and the electron beam beam is used as a primary color signal when scanning color phosphor stripes. When scanning the phosphor stripe, the density modulation is performed by the primary color signal of blue.

(단 n=0, 1, 2…)로 하는 방법이 있다. 인덱스신호의 주파수는 인덱스형광체스트라이프(11)의 피치 P₁에 반비례하고, 전자비임의 수평주사속도에 비례한다. 따라서 수평주사속도가 일정하면 인덱스신호의 주파수는 일정하지만 수평편향의 직선성이 불량하여 수평주사속도가 변환되면 인덱스신호의 주파수도 변동된다.In this case, in the method of arranging the index phosphor stripes, first, as shown in FIG. 1, the pitch P ₁ of the index phosphor stripes 11 is a pair of red, green, and blue color phosphor stripes R, G, and B. In general, there is a method of making integer multiples such as the pitch P _T , and, secondly, as shown in FIG. 2 or FIG. 3, the pitch P ₁ is generally 2/3 or 4/3 of the pitch P _T.

(Where n = 0, 1, 2 ...). The frequency of the index signal is inversely proportional to the pitch P ₁ of the index phosphor strip 11 and is proportional to the horizontal scanning speed of the electron beam. Therefore, if the horizontal scanning speed is constant, the frequency of the index signal is constant, but if the horizontal scanning speed is changed due to poor linearity of the horizontal deflection, the frequency of the index signal is also changed.

However, in the case of changing the color gamut due to the index signal in this manner, a static time delay occurs between the amplifier and the water pipe after switching the color after the index signal is detected. In other words, the processing loop from the detection of the index signal to the color switching circuit, the amplifier and the water pipe has a static delay time _r L. As a result, when the frequency of the index signal is changed as described above, the timing of the color switching is incorrect and accurate color cannot be reproduced.

The present invention is intended to eliminate this drawback in a simple way. In order to take the color synchronism as the index signal as described above, the index signal is supplied to the PLL circuit to obtain a signal that is synchronized with the index signal and has a constant frequency relation with respect to the index signal. The switching timing may be taken.

In this case, since the frequency variation of the index signal due to the change in the horizontal scanning speed is gentle, the PLL circuit may be configured to respond only to such gentle frequency variation. If the PLL circuit is configured in this way, a sudden frequency change may occur due to noise in the index signal, but the PLL circuit does not respond to it.

In view of the use of the PLL circuit as described above, the present invention inserts a delay circuit into the loop from the VCO to the phase comparator of the PLL circuit and selects the delay time of the delay circuit to be offset from the static delay time _r L described above.

4 is an embodiment of a color television receiver according to the present invention, and (1) is a beam index type color water pipe, and is configured as shown in FIG. 6 by way of example. That is, red, green, and blue color phosphor strips R, G, and B are sequentially arranged in the horizontal scanning direction on the inner surface of the panel to form an effective screen portion 6, in which case between the color phosphor stripes R, G, and B and the effective screen. The black material 7, such as carbon, is formed in the periphery of the part 6, and the metal pack 8 of aluminum is formed over the whole surface. The index phosphor stripes 11 are arranged in the horizontal scanning direction on the metal pack 8 across the effective screen portion 6 and one horizontal scanning start portion 9 thereof, and red, green, and blue color phosphor stripes R, G And a set of pitches of B, for example 2/3 pitch. The index phosphor stripes 11 are provided at positions between the red, green, and blue green phosphor stripes R, G, and B.

The panel 16 of the color receiver 1 is attached with a lens 16 which receives the light 15 emitted when the electron beam 14 scans the index phosphor strip 11, and a photoelectric converter 17 on the outside thereof. Is placed. The horizontal synchronous signal P _H (Fig. 6J) is supplied to the monostable multivibrator 21 to obtain a pulse M ₁ (equivalent K) having a constant pulse width, and a flip-flop at the trailing edge of this pulse M ₁ . The circuit 22 is SELed so that one output signal F ₁ (equivalent L) is "1", the other output signal F ₁ (equivalent M) is "0", and the output signal F ₁ is "1". As a result, the gate circuit 31 is opened to supply the DC voltage of the value previously adjusted by the variable resistor 32 to the first grid 18 of the tube 1 through the amplifier 33 so that the electron beam 14 is constant. The index fluorescent substance strip 11 of the horizontal scanning start section 9 described above at a non-dose is scanned, and an index signal S ₁ (equivalent A) is obtained from the photoelectric converter 17.

The index signal S ₁ is supplied to the band pass filter 41, and the signal S _D (Fig. 6B) of the fundamental frequency is output. This signal S _D is supplied to the PLL circuit 42 to synchronize with the signal S _D, and a frequency pulse S _L (equivalent D) twice the frequency of the signal S _D is obtained. That is, the oscillation pulse of the VCO 43 is divided in half by the divider 44, and the phase comparator 45 compares the divided pulse with the signal S _D by comparing the phase error with the low pass filter ( It passes through 46 and is supplied to VCO 43, and pulse S _L is obtained from VCO 43. This pulse S _L is supplied to the frequency divider circuit 60.

In the present invention, in the VCO 43 of the PLL circuit 42, for example, a delay circuit 47 is inserted into the output side of the divider 44 in the loop to the phase comparator 45, and this delay circuit ( The delay time of 47) becomes equal to the delay time _r L described above. In the example of the figure, since the band pass filter 41 has a band pass filter 41, the delay circuit 47 is composed of a band pass filter 48 and the delay circuit 49, the characteristics of the band pass filter 48 is the band pass filter 41 The delay time of the band pass filter 48 is equal to the delay time of the band pass filter 41, and the delay time of the delay circuit 49 is equal to the delay time of the band pass filter 41 at the delay time _rL . This is the same case as deducting the delay time.

On the other hand, the signal S _D from the band pass filter 41 is supplied to the pulsed circuit 51 and, for example, the index pulse S _P which stands at zero cross point when the signal S _D moves from the positive polarity to the negative polarity 6 degrees C) is obtained. The index pulse S _P is supplied to the counter 52, and the index pulse S _P is counted in the " 1 " period of the output signal F ₁ of the flip-flop circuit 22. Therefore, the index pulse S _P in the horizontal scanning start section 9 is 1, 2, 3... If counted as shown and a predetermined value, i.e. in the figure, is counted up to 8 corresponding to the final one in the horizontal scan initiation section 9 of the index phosphor stripe 11, for example a negative pulse at the counter 524 S _C (equivalent E) is obtained. This pulse S _C is supplied to the monostable multi-vibrator 53, and a pulse S _M (figure F) having a pulse width necessary for timing the granularity shown by the arrow is obtained.

At the trailing edge of the pulse S _M , the flip-flop circuit 22 is re-received so that the output signal F ₁ (Fig. 6 L) becomes "0" and the output signal F ₁ (figure M) becomes "1". The counter 52 is lit as the output signal F ₁ becomes "0".

The pulse S _M is supplied to the auxiliary circuit 60 and regulated by the pulse S _M , and the phases of the PLL circuit 42 divided by 1/3 each of the output signals S _L are divided by one-third. Pulses F _R , F _Q and F _B for red, green and blue division are obtained.

That is, the divider circuit 60 is composed of ring counters having three stages of JK flip-flop circuits 61 to 63, as shown in FIG. 5, and the circuit 61 in the pulse width section of the pulse SM. ) Is free and its Q output F _R (Fig. 6 G) becomes " 1 " and circuits 62 and 63 are cleared so that each Q output F _G and F _B (equivalent H and I) Becomes "0". Each output fluctuates due to the first arrival of the next signal S _L of the pulse S _M so that the Q output F _R of the circuit 61 is " 0 " and the Q output F _G of the circuit 62 _is " 1 " The Q output F _B becomes "0".

As the next arrival of the signal S _L , the Q output F _R of the circuit 61 becomes "0", the Q output F _G of the "0" circuit 62 becomes "0", and the Q output F _B of the circuit 634 becomes "1". Then, at the next arrival of the signal S _L , the same state as the initial state, that is, the Q output F _R of the circuit 61 is "1", the Q output F _G of the circuit 62 is "0", and the Q of the circuit 634. The output F _B becomes "0", and then the above-described operation is repeated _.

Therefore, the Q outputs F _R, F _{G, and} F _B of the JK flip-flop circuits 61, 62, and 63 have an electron beam 14 having red, green, and blue colored phosphor stripes R of the effective screen portion 6, respectively. , G and B are " 1 "

(동도 M)가 "1"이 되고, 부할용펄스 F_R,F_{G 및}F_B는 이 출력신호

가 "1"이 되므로서, 전자비임(64)이 유효화면부(6)를 주사하는 기간으로 AND회로 (71),(72) 및 (73)에서 게이트신호 G_R,G_{G 및}G_B(동도 N, O 및 P)가 출력된다.These splitting pulses F _R, F _{G and} F _B are supplied to the AND circuits 71, 72 and 73 while the flip-flop circuit is provided at the trailing edge of the pulse S _M from the monostable multivibrator 53. 22, the output signal F ₁ (Fig. 6 L) is " 0 "

(Elevation M) becomes "1", and the load pulses F _R, F _{G and} F _B are output signals.

Becomes " 1 ", so that the gate signals G _R, G _{G and} G _B (in the AND circuits 71, 72 and 73 during the period in which the electron beam 64 scans the effective screen portion 6 are obtained. Elevations N, O and P) are output.

In the intervals of " 1 " of each of the gate signals G _R, G _{G, and} G _B , the gate circuits 34, 35, and 36 are opened, and the red, green, and blue primary color signals E _R, E _{G and} E _B are supplied to the first grid 18 of the tube 1 via an amplifier 33.

Therefore, the electron beam 14 is the primary color signal E _R of the red when scanning the red phosphor stripe _R , and the primary color signal E _G of the green when scanning the green phosphor stripe G. Density modulated with E _B , respectively.

In the present invention, as described above, the delay circuit 47 is inserted into the loop from the VCO 43 to the phase comparator 45 of the PLL circuit 42 so that the delay time is color switched in the detection of the index signal S ₁ . Since the static delay time r _L of the entire loop to the post amplifier and the receiver pipe is the same, the phase comparator of the phase comparator 45 cancels the static delay time r _L and the color of the index signal S _I changes. The timing of the red, green, and blue color phosphor stripes R, G, and B of the switching is never wrong, so that accurate color reproduction is always reproduced. In the embodiment of the figure, the index scanning stripe 11 is counted by the horizontal scanning initiation unit 9 and the color output is regulated by the count output. However, the boundary between the horizontal scanning initiation unit 9 and the effective screen unit 6 is limited. In the present invention, the color phosphor may be regulated by separating one or several index phosphor stripes in the present invention, and the present invention may be applied as it is.

Also, as shown in FIG. 1, the present invention is also applicable to the case where the pitch of the index fluorescent stripe 11 is normally multiplied by the same number of pitches of the red, green, and blue color phosphor stripes R, G, and B. Can be.

As described above, according to the present invention, even if the horizontal scanning speed of the electron beam is changed and the frequency of the index signal is changed by a simple configuration by simply inserting a delay circuit into the PPL circuit, accurate color reproduction is always performed without wrong timing of color switching. You can do that. Therefore, there is no need to consider the horizontal deflection circuit so that the horizontal scanning speed is constant as in the prior art.

Claims (1)

Red, green, and blue color phosphor stripes are arranged on the inner surface of the panel continuously in a horizontal scanning direction, and an effective screen portion is formed. An index phosphor stripe is arranged in the horizontal scanning direction over the effective screen portion and the horizontal scanning initiation portion. Color number correlation of the installed beam index method is used, in which the index signal obtained by the electron beam scanning the index phosphor stripe is supplied to the PLL circuit and the color is switched by the output signal of the PLL circuit. In the receiver, a delay circuit 47 is inserted into the feedback loop from the VCO 43 to the phase comparator 45 of the PLL circuit 42 and the delay time of the delay circuit 48 detects the index signal. Is selected to cancel the static delay time of the entire loop from the color switching circuit to the amplifier receiver tube. Color television receiver, characterized by.

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