JP3400167B2 - Projection TV - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection television for reducing the difference in spot diameter between the left and right, the upper and lower sides, the center, and the periphery caused by oblique projection to balance the image on the entire screen and improve the image quality. It is a thing.

[0002]

2. Description of the Related Art In recent years, short focus lenses and C with a short neck length have been used.
With the development of element parts such as RT, the rear-integrated projection TV is becoming thinner, but in the conventional projection TV, the spot diameters of left and right, top and bottom, center and periphery caused by oblique projection are reduced. The difference is a problem of the optical system, and no improvement by an electric circuit has been made.

[0003]

However, in the three-tube rear-integrated projection television having such a configuration, the incident angle of blue and red light on the screen becomes acute due to the three-tube projection, and the oblique angle becomes slanted. There are differences in the spot diameter between the left and right, the top and bottom, and the center and the periphery due to projection.

Further, in the blue CRT of the three-tube rear-integrated projection television, a defocus gun for intentionally shifting the focus is generally used in order to gain brightness when the drive value of the video signal is high. . However, since the focus shifts according to the drive value, there is a problem in that a scene with a high drive value and a scene with a low drive value have different spot diameters, causing a scene in which the image feels strange.

The present invention solves the above-mentioned problems of the prior art. In a projection television, the difference in spot diameter between left and right, top and bottom, center and periphery caused by oblique projection is reduced, and the entire screen is reduced. It is possible to balance the images.

Further, in the blue CRT defocusing gun, even when the focus is intentionally shifted in order to gain the brightness when the drive value is high, the spot diameter is not much different from that when the drive value is low. It is an object to provide a projection television.

[0007]

To achieve this object, a projection television according to the present invention comprises a VM coil fixed to the neck portion of a red CRT for performing a VM, and the VM coil for performing a VM from a video signal. And a first modulation circuit that modulates the VM signal transmitted to the VM coil of the red CRT with a sawtooth wave synchronized with a horizontal frequency (fh). And

Also, the VM fixed to the neck of the red CRT
And a signal generation circuit for processing the VM signal transmitted to the VM coil to perform VM from the video signal, and the V signal transmitted to the VM coil of the red CRT.
The first to modulate the M signal with a sawtooth wave synchronized with the horizontal frequency (fh)
And a VM coil fixed to the neck portion of the blue CRT, and a second modulation circuit that modulates the VM signal transmitted to the VM coil of the blue CRT with a sawtooth wave having a waveform obtained by inverting the sawtooth wave. It is characterized by

Further, V transmitted to the VM coil of the blue CRT
Instead of the second modulation circuit that modulates the M signal, it has an inverting circuit that inverts the output of the first modulation circuit that modulates the VM signal transmitted to the VM coil of the red CRT.

In addition, the VM fixed to the neck of the green CRT
And a signal generation circuit for processing the VM signal transmitted to the VM coil to perform the VM from the video signal, the H parabolic wave and the vertical frequency (fv) that synchronize the VM signal with the horizontal frequency (fh). And a third modulation circuit that modulates with a V parabola wave synchronized with.

Further, each VM coil for performing VM fixed to the neck portion of each of the red, blue, and green CRTs, and signal generation generated by processing the VM signal transmitted to the VM coil for performing VM from the video signal. Circuit and V of the red CRT
A first modulation circuit that modulates the VM signal transmitted to the M coil with a sawtooth wave synchronized with a horizontal frequency (fh), and a sawtooth wave having a waveform obtained by inverting the sawtooth wave of the VM signal transmitted to the VM coil of the blue CRT. Second modulation circuit that modulates with, and the green CRT
Of the VM signal transmitted to the VM coil of
It is characterized by having an H parabolic wave synchronized with h) and a third modulation circuit that modulates with a V parabolic wave synchronized with a vertical frequency (fv).

Further, each VM coil for performing VM fixed to the neck portion of each of the red, blue, and green CRTs, and signal generation generated by processing the VM signal transmitted to the VM coil for performing VM from the video signal. Circuit and V of the red CRT
A first modulation circuit for modulating the VM signal transmitted to the M coil with a sawtooth wave synchronized with a horizontal frequency (fh); an inverting circuit for inverting the output signal of the modulation circuit transmitted to the VM coil of the blue CRT; A signal transmitted to the VM coil of the green CRT is synthesized from a signal obtained by slicing the output signal of the first modulation circuit with a DC value serving as a reference value and a signal obtained by similarly slicing the output signal of the inverting circuit with the DC value. And a synthesizing circuit.

Further, each VM coil for performing a VM fixed to the neck portion of each of the red, blue and green CRTs, and a signal generation generated by processing the VM signal transmitted to the VM coil for performing the VM from the video signal. A circuit, a sawtooth wave synchronized with the horizontal frequency (fh), a sawtooth wave with a waveform inverted from the sawtooth wave, an H parabolic wave synchronized with the horizontal frequency (fh), and a V parabolic wave synchronized with the vertical frequency (fv). A synthesizing circuit for synthesizing at a given ratio to generate a waveform for modulating the VM signal, which is adapted to the R, G, B signals for each CRT of the video signal, and the VM signal for each of the R, G, B signals. And a modulation circuit for modulating with a dedicated modulation waveform.

Further, the synthesizing circuit for producing a waveform for modulating the VM signal adapted to each of the R, G and B signals is arranged such that the VM signal is adapted to each of the R, G and B signals by the output of the synthesizing circuit. It is characterized in that it can be arbitrarily adjusted from the outside in order to modulate the signal.

Also, a VM fixed to the neck portion of the blue CRT
A VM coil for performing a VM signal, a signal generation circuit for processing a VM signal transmitted to the VM coil to perform a VM from a video signal, a detection circuit for detecting a drive value of the video signal, and a detection value of the detection circuit. And a switch circuit for comparing the magnitude of the VM signal with an arbitrarily set reference value, and a switch circuit for transmitting or shutting off the VM signal to the VM coil according to the result of the comparator.

A VM fixed to the neck of the blue CRT
A VM coil for performing a VM signal, a signal generation circuit for processing the VM signal transmitted to the VM coil to perform the VM from the video signal, a modulation circuit for modulating the VM signal with an arbitrary waveform, and a drive for the video signal A detection circuit that detects a value, a comparator that compares the detected value of the detection circuit with a reference value that is arbitrarily set, and an output signal of the modulation circuit to the VM coil according to the result of the comparator. And a switch circuit for transmitting and cutting off.

Also, a VM fixed to the neck of the blue CRT
VM coil for performing the above, a signal generation circuit for processing the VM signal transmitted to the VM coil to perform the VM from the video signal, a modulation circuit for modulating the VM signal with an arbitrary waveform, and an output of the modulation circuit A setting circuit for setting an arbitrary value of the signal gain by an arbitrary number, a detection circuit for detecting the drive value of the video signal, and a size of the detection value of the detection circuit and an arbitrarily set reference value are set. A comparator to compare with,
A switch circuit for selecting from an output signal having an arbitrary number of arbitrary values of the setting circuit transmitted to the VM coil according to the result of the comparator.

Also, a VM fixed to the neck portion of the blue CRT
A VM coil for performing a VM signal, a signal generation circuit for processing the VM signal transmitted to the VM coil to perform the VM from the video signal, a modulation circuit for modulating the VM signal with an arbitrary waveform, and a drive for the video signal A detection circuit that detects a value, a comparator that compares the detected value of the detection circuit with a reference value that is arbitrarily set, and the gain of the output signal of the modulation circuit is arbitrarily set according to the result of the comparator. And a control circuit that variably outputs the signal.

[0019]

According to the above construction, in order to increase the VM correction at the point where the spot diameter on the screen is enlarged by oblique projection in the image projected on the screen,
A right-up sawtooth wave, a right-down sawtooth wave that is synchronized with the horizontal frequency (fh), and an H parabola wave and a V parabola wave that is synchronized with the vertical frequency (fv) are combined at an arbitrary ratio, and R,
The VM signal is processed after being processed into a VM signal suitable for each of the G and B signals. Therefore, at the point where the spot diameter is enlarged, the VM correction is large.

Further, the drive value is detected by the video signal detection circuit, compared with an arbitrary reference value by a comparator, and when the drive value is equal to or higher than the reference value, a switch circuit or a control circuit switches the VM correction amount to VM. Change the correction amount of.
Therefore, the correction of VM is large at the point where the spot diameter is enlarged.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a partial block of a three-tube rear integrated projection television that is Embodiment 1 of the present invention. In FIG. 1, 1 is a green CRT and 2 is a red CRT.
RT, 3 is blue CRT, 4 is screen, 5 is red CRT 2
VM coil, 6 is a blue CRT3 VM coil, and 7 is a VM
A signal generation circuit for signals, 8 is a first modulation circuit, and 8'is a second modulation circuit.
It is a modulation circuit of. In each of the following drawings, the same reference numerals are given to those having the same action and effect.

As shown in FIG. 1, in a three-tube rear integrated projection television, three CRTs have a green CRT 1 as a center and a red CRT 2 and a blue CRT 3 on both sides thereof.
The VM coil 5 and the VM coil 6 are fixed to the neck portions of the red CRT 2 and the blue CRT 3 of the three CRTs, respectively. In the VM coil 5, the video signal is processed and the VM is processed.
The VM signal output from the signal generation circuit 7 that produces a signal is
The signal is modulated and input by the first modulation circuit 8 that performs modulation with a sawtooth wave that rises to the right in synchronization with the horizontal frequency (fh). Further, the VM signal output from the signal generating circuit 7 is modulated and input to the VM coil 6 by a second modulating circuit 8'which modulates with a downward-sloping sawtooth wave synchronized with the horizontal frequency (fh).

By transmitting the VM signal modulated by the sawtooth wave synchronized with the horizontal frequency (fh), the effect of the VM is made different between the left and right of the screen, and the incident angle of the projection light on the screen 4 becomes an acute angle. By increasing the VM effect at the position where the diameter becomes large, the spot diameters of the entire screen are balanced. As a result, the projection light from the red CRT 2 and the blue CRT 3 is obliquely applied to the screen 4,
By the difference between the projection distance and the incident angle, it is possible to reduce the blurring of the image generated in the image with the longer projection distance.

FIG. 2 is an explanatory view of a partial block of a three-tube rear integrated projection television in which a part of the first embodiment of the present invention is modified, and 9 shows an output signal of the first modulation circuit 8. It is an inverting circuit that inverts. 3 CRTs as in Example 1
Is green CRT1 with red CRT2 and blue CR on both sides
The T3 is installed, and the VM coil 5 and the VM coil 6 are fixed to the neck portions of the red CRT 2 and the blue CRT 3 of the three CRTs, respectively. In the VM coil 5, the VM from the signal generation circuit 7 that processes the video signal to produce the VM signal is used.
A signal obtained by modulating the signal output by the first modulating circuit 8 which performs modulation with a sawtooth wave rising in the right direction in synchronization with the horizontal frequency (fh) is input. Further, a signal obtained by inverting the VM signal output modulated by the first modulation circuit 8 by the inverting circuit 9 is input to the VM coil 6. As a result, the same effect as that of the first embodiment can be implemented with a smaller circuit scale.

Next, FIG. 3 is an explanatory view of a partial block of a three-tube rear-integrated projection type television according to the second embodiment of the present invention, in which 10 is a VM coil of a green CRT 1 and 11 is a H, V parabolic wave VM. It is a 3rd modulation circuit which modulates a signal. Green CR
The VM coil 10 is fixed to the neck portion of T1, and the VM signal output from the signal generating circuit 7 that processes the video signal to generate the VM signal is applied to the VM coil 10 by the H parabola synchronized with the horizontal frequency (fh). The signal modulated by the third modulating circuit 11 which is modulated by the V parabolic wave synchronized with the wave and the vertical frequency (fv) is input. As a result, the green CR installed in the center
Also at T1, when the projection distance is shortened, it is possible to reduce the image bleeding in the peripheral portion of the screen where the projection distance is long due to the difference between the projection distance and the incident angle between the central portion and the peripheral portion of the screen.

Next, FIG. 4 is an explanatory view of a partial block of the three-tube rear integrated projection television in the third embodiment of the present invention. As shown in FIG. 4, in the configuration of the case where the second modulation circuit is used for the input of the VM coil of the blue CRT (a) and the case where the inverting circuit is used for the input of the VM coil of the blue CRT (b), the first embodiment And the configuration described in the second embodiment together, the bleeding that occurs in the image having a longer projection distance than the difference between the projection distance and the incident angle of the projection light of each of the green CRT1, the red CRT2, and the blue CRT3 is simultaneously reduced. It becomes possible.

Next, FIG. 5 is an explanatory diagram of a partial block of a three-tube rear-integrated projection television according to a fourth embodiment of the present invention, in which 12 is an output signal from the first modulation circuit 8 and the inverting circuit 9. This is a composition circuit for composition. The VM signal output from the signal generating circuit 7 that processes the video signal to generate the VM signal is modulated by the first modulating circuit 8 with a rising sawtooth wave synchronized with the horizontal frequency (fh), and the VM coil of the red CRT 2 is generated. Input to 5. Further, the signal output of the first modulation circuit 8 is the inverting circuit 9
It is inverted by and input to the VM coil 6 of the blue CRT 3. Further, in the synthesizing circuit 12, the signal output of the first modulation circuit 8 is sliced by the DC value serving as the reference value, and similarly, the signal of the first modulation circuit 8 inverted by the inverting circuit 9 also serves as the reference value DC. By slicing with a value and synthesizing each two signals after slicing, a synthetic signal in which a VM signal exists in an arbitrary period after the start of horizontal scanning and in an arbitrary period before the end of horizontal scanning is created,
Input to VM coil 10 of green CRT1. This makes 3
In all CRTs of a book, it is possible to reduce image bleeding caused by the difference between the projection distance and the incident angle at the right end and the left end of the screen.

Next, FIG. 6 is an explanatory diagram of a partial block of a three-tube rear-integrated projection type television according to a fifth embodiment of the present invention, in which 13 is a downward-sloping sawtooth wave synchronized with a horizontal frequency (fh), and a right side is shown. This is a combining circuit for combining the rising sawtooth wave and the H parabolic wave with the V parabolic wave synchronized with the vertical frequency (fv). For the downward-sloping sawtooth wave that is synchronized with the horizontal frequency (fh), the upward-saw sawtooth wave, and the H parabolic wave and the V parabolic wave that is synchronized with the vertical frequency (fv), the respective waveforms can be controlled by an external control of the composition ratio. Input to the possible synthesis circuit 13, R of the video signal,
The waveform for modulation is adapted to each of the G and B signals. The VM signal output from the signal generating circuit 7 which processes the video signal to generate the VM signal is input to the first, second and third modulating circuits 8, 8'and 11 which are modulated by the output from the synthesizing circuit 13. To be done.

The VM signal modulated by the waveform for modulation adapted to each R, G, B signal is a green CRT1 and a red CRT.
2, input to VM coil 10, 5, 6 of blue CRT3,
The composition ratio of the composition circuit 13 is adjusted so that the image bleeding caused by the difference between the projection distance and the incident angle is minimized.
This reduces the image bleeding caused by the difference between the projection distance and the incident angle by adjusting the synthesizing circuit 13.
It is possible to reduce the variation between the sets of T1, red CRT2, and blue CRT3.

Next, FIG. 7 is an explanatory diagram of a partial block of a three-tube rear-integrated projection television in Embodiment 6 of the present invention, in which 14 is a detection circuit for detecting a drive value of a video signal, and 15 is a detection circuit.
Is a comparator for comparing the detection result with a reference value, and 16 is a switch circuit for switching the input to the VM coil.

The comparator 15 outputs "HI" when the drive value of the video signal to the blue CRT 3 detected by the detection circuit 14 is a drive value equal to or larger than the arbitrarily set reference value. The VM signal output from the signal generation circuit 7 that processes the video signal to generate the VM signal is input to the switch circuit 16 that performs switching by the output of the comparator 15. The switch circuit 16 transmits the VM signal to the VM coil 6 of the blue CRT 3 when the output of the comparator 15 is "HI", and cuts off the VM signal when the output of the comparator 15 is "LOW". As a result, in a defocus gun that intentionally shifts the focus to gain brightness when the drive value is high,
Even if the drive value is low, the spot diameter will not be significantly different.

FIG. 8 is an explanatory diagram of a partial block of a three-tube rear integrated projection television in which a modulation circuit for modulating a VM signal is provided in the sixth embodiment of the present invention, and 17 is a modulation circuit. As described in the sixth embodiment, the signal generation circuit 7
The VM signal output from is modulated by the modulation circuit 17 which modulates with an arbitrary waveform, and is transmitted to the VM coil through the switch circuit 16. The operation after switching by the switch circuit 16 is the same as that of the sixth embodiment.

Next, FIG. 9 is an explanatory view of a partial block of a three-tube rear integrated projection television in Embodiment 7 of the present invention, in which 16 'is a switch circuit and 18 is a setting circuit. A VM signal output from the signal generation circuit 7 that processes a video signal to generate a VM signal is a modulation circuit that performs modulation with an arbitrary waveform.
Modulated by 17. The output signal is set by the setting circuit 18 as a signal gain to an arbitrary value and an arbitrary number. By the output of the comparator 15 that compares the drive value of the blue CRT 3 detected by the detection circuit 14 with the arbitrarily set reference value, each value set by the setting circuit 18 as an arbitrary number is switched. Select with 16 '. As a result, the effect of the VM signal can be changed stepwise according to the drive value, and in the defocus gun in which the focus is intentionally shifted to increase the brightness when the drive value is high, the drive value It is possible to reduce a large difference in spot diameter as compared with the case where is low.

Next, FIG. 10 is an explanatory view of a partial block of the three-tube rear integrated projection television in Embodiment 8 of the present invention, and 19 is a control circuit for controlling the output gain of the modulation circuit. The VM signal output from the signal generation circuit 7 that processes the video signal to generate the VM signal is passed through the modulation circuit 17 and the control circuit.
Entered in 19. The control circuit 19 controls the gain of the VM signal output according to the detected drive value by the output of the detection circuit 14 that detects the drive value of the blue CRT 3 and the output of the comparator 15 that compares the reference value that is set arbitrarily. To do. From this, the effect of the VM signal is increased by the control circuit 19 when the drive value is high, and the effect of the VM signal is decreased when the drive value is low, so that the effect of the VM signal is continuously changed according to the drive value. It is possible to reduce the change in the spot diameter due to the change in the drive value in the defocus gun.

[0035]

As described above, the CRT of the projection television of the present invention is the VM of the neck portion of the red, green, and blue CRTs.
The VM signal output of the signal generation circuit that processes the video signal into the coil and generates the VM signal is synchronized with the horizontal frequency (fh) in order to increase the VM correction at the point where the spot diameter on the screen is enlarged. A VM signal adapted to each of R, G, and B signals of a video signal by synthesizing a right-up sawtooth wave, a right-down sawtooth wave, an H parabola wave, and a V parabola wave synchronized with a vertical frequency (fv) at an arbitrary ratio. After processing to, apply VM. Therefore, at the point where the spot diameter is enlarged, the correction of the VM takes a large amount, so that the enlargement of the spot diameter projected on the screen can be suppressed by the correction of the VM as compared with the state without the correction. Therefore, it is possible to reduce the difference in spot diameters such as left and right, top and bottom, center and periphery that occur due to oblique projection, and balance the image on the entire screen. Also, each CRT can be brought close to the screen, and the screen can be made thinner.

In addition, the three-tube rear integrated projection television blue
The CRT is a defocusing gun that intentionally shifts the focus in order to gain brightness when the drive value of the video signal is high . Therefore , when the drive value is high, the focus is theoretically out of focus. The diameter is enlarged. A detection circuit that detects the drive value of the video signal detects a point having a drive value equal to or greater than a certain reference value, and a switching circuit that switches the VM correction amount increases the VM correction amount at that point. Therefore, at the point where the spot diameter is enlarged, the correction of the VM takes a large amount, so that the enlargement of the spot diameter projected on the screen can be suppressed more than in the state without the correction. For this reason, the three-tube rear-integrated type throws the focus deliberately in order to increase the brightness when the drive value is high.
Even in the defocusing gun of the blue CRT of the photo-television ,
The spot diameter is not significantly different compared to when the drive value is low, and the red CR in the three-tube rear integrated projection TV
No difference in spot diameter of blue CRT with respect to T and green CRT
Comb, an effect that it can balance the image of the entire screen.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a partial block showing a three-tube rear integrated projection television according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a partial block showing a three-tube rear integrated projection television in which a part of the first embodiment of the present invention is modified.

FIG. 3 is an explanatory diagram of a partial block showing a three-tube rear integrated projection television in Embodiment 2 of the present invention.

FIG. 4 shows a three-tube rear-integrated projection television using a second modulation circuit (a) and an inversion circuit (b) for inputting a VM coil of a blue CRT according to a third embodiment of the present invention. It is explanatory drawing of the partial block shown.

FIG. 5 is an explanatory diagram of a partial block showing a three-tube rear integrated projection television in Embodiment 4 of the present invention.

FIG. 6 is an explanatory diagram of a partial block showing a three-tube rear integrated projection television according to a fifth embodiment of the present invention.

FIG. 7 is an explanatory diagram of a partial block showing a three-tube rear integrated projection television according to a sixth embodiment of the present invention.

FIG. 8 is a partial block diagram showing a three-tube rear-integrated projection television in which a modulation circuit for modulating a VM signal is provided in the sixth embodiment of the present invention.

FIG. 9 is an explanatory diagram of a partial block of a three-tube rear integrated projection television in Example 7 of the present invention.

FIG. 10 is an explanatory diagram of a partial block of a three-tube rear integrated projection television in Example 7 of the present invention.

[Explanation of symbols]

1 ... Green CRT, 2 ... Red CRT, 3 ... Blue CRT, 4
... screen, 5, 6, 10 ... VM coil (deflection coil for velocity modulation), 7 ... signal generating circuit, 8 ... first modulating circuit, 8 '... second modulating circuit, 9 ... inverting circuit, 11
… Third modulation circuit, 12, 13… Combining circuit, 14… Detecting circuit, 15… Comparator, 16,16 ′… Switch circuit, 17…
Modulation circuit, 18 ... Setting circuit, 19 ... Control circuit.

Claims (12)

(57) [Claims] 1. A velocity modulation fixed to the neck of a red CRT.
A velocity modulation deflection coil (hereinafter referred to as VM) (hereinafter referred to as VM coil), and a velocity modulation signal (hereinafter referred to as V coil) transmitted to the VM coil for performing VM from a video signal.
A signal generating circuit for processing the M signal) and a first modulating circuit for modulating the VM signal transmitted to the VM coil of the red CRT with a sawtooth wave synchronized with a horizontal frequency (fh).
Equipped with red, green, three-tube rear integrated projection TV
Three projections projected on the screen from three blue CRTs
The difference in variation of the spot diameter of the projected light is controlled by the VM correction amount.
Projection TV which is characterized in that there was Unishi. 2. A VM coil for performing VM fixed to a neck portion of a red CRT, and the V coil for performing VM from a video signal.
A signal generating circuit that processes and produces a VM signal transmitted to the M coil, a first modulation circuit that modulates the VM signal transmitted to the VM coil of the red CRT with a sawtooth wave synchronized with a horizontal frequency (fh), and a blue CRT comprising of a VM coil fixed to the neck portion, and a second modulation circuit for modulating the VM signal transmitted to the blue CRT of VM coils sawtooth waveform obtained by inverting the sawtooth wave, Sankanshiki rear integrated In projection television
Projected on the screen from three CRTs of red, green and blue
The difference in the spot diameter fluctuations of the three projection lights is controlled by the VM correction amount.
A projection-type television characterized by being controlled . 3. An output of a first modulation circuit that modulates a VM signal transmitted to a VM coil of a red CRT, in place of the second modulation circuit that modulates a VM signal transmitted to the VM coil of a blue CRT according to claim 2. Equipped with an inversion circuit that inverts the three-tube rear
Three CRTs for red, green, and blue in an integrated projection TV
Diameter of the three projection lights projected from the screen to the screen
The projection type television characterized in that the difference in fluctuation of the control is controlled by the correction amount of the VM . 4. A VM coil for performing VM fixed to a neck portion of a green CRT, and the VM for performing VM from a video signal.
A signal generation circuit for processing the VM signal transmitted to the coil and a third modulation circuit for modulating the VM signal with the H parabolic wave synchronized with the horizontal frequency (fh) and the V parabolic wave synchronized with the vertical frequency (fv). Equipped with a three-tube rear integrated projection
From the red, green, and blue CRTs on the screen to the screen
The difference in the spot diameter fluctuations of the three projected lights is
A projection television characterized by being controlled by a correction amount . 5. VM coils fixed to the necks of red, blue and green CRTs for performing VMs, and signal generation generated by processing VM signals transmitted to the VM coils for performing VMs from video signals. A circuit, a first modulation circuit that modulates the VM signal transmitted to the VM coil of the red CRT with a sawtooth wave synchronized with a horizontal frequency (fh), and a VM of the blue CRT
A second modulation circuit that modulates the VM signal transmitted to the coil with a sawtooth wave having a waveform obtained by inverting the sawtooth wave, and V of the green CRT.
A three- tube type reciprocating circuit, which comprises a third modulation circuit for modulating the VM signal transmitted to the M coil with an H parabolic wave synchronized with the horizontal frequency (fh) and a V parabolic wave synchronized with the vertical frequency (fv).
A. Three CRs of red, green, and blue in the integrated projection TV
Three projected light spots projected from T to the screen
A projection television characterized in that a difference in diameter variation is controlled by a VM correction amount . 6. Each VM coil for performing VM fixed to the neck portion of each of red, blue and green CRTs, and signal generation generated by processing a VM signal transmitted to the VM coil to perform VM from a video signal. A circuit, a first modulation circuit that modulates the VM signal transmitted to the VM coil of the red CRT with a sawtooth wave synchronized with a horizontal frequency (fh), and a VM of the blue CRT
An inverting circuit for inverting the output signal of the modulation circuit transmitted to the coil, a signal obtained by slicing the output signal of the first modulation circuit with a DC value serving as a reference value, and an output signal of the inverting circuit with the DC value in the same manner. The green CR from the sliced signal
Equipped with a combining circuit that combines the signals transmitted to the VM coil of T
E, red, green, blue in a three-tube rear integrated projection TV
Projection from 3 CRTs on the screen
To control the difference in fluctuation of the spot diameter of light with the correction amount of VM.
Projection TV, characterized in that it was. 7. VM coils fixed to the necks of red, blue, and green CRTs for performing VMs, and signal generation generated by processing VM signals transmitted to the VM coils for performing VMs from video signals. Circuit, sawtooth wave synchronized with horizontal frequency (fh), sawtooth wave with inverted sawtooth wave, H parabolic wave synchronized with horizontal frequency (fh) and vertical frequency (f
a synthesis circuit for synthesizing V parabolic waves synchronized with v) at an arbitrary ratio to generate a waveform for modulating the VM signal that is suitable for each of the R, G, and B signals to each CRT of the video signal;
A three-tube rear integrated type including a modulation circuit that modulates the VM signal with a dedicated modulation waveform of each of the R, G, and B signals.
From the three CRTs of red, green, and blue on the projection TV,
Fluctuations in the spot diameter of the three projection lights that are projected cleanly
A projection television characterized in that the difference is controlled by a correction amount of VM . 8. A VM adapted to each of R, G and B signals.
Combining circuit to produce a waveform for modulating a signal, the said VM signal by the output of the combining circuit R, G, in order to modulate the signal conforming to the respective B signals, and optionally adjustable from the outside, the three In a tube-type rear integrated projection TV
Are projected on the screen from three red, green and blue CRTs.
Difference in the spot diameter of the three projected light
Projection television according to claim 7, characterized in that as control. 9. A VM coil for performing VM fixed to a neck portion of a blue CRT, and the V coil for performing VM from a video signal.
A signal generation circuit for processing the VM signal transmitted to the M coil, a detection circuit for detecting the drive value of the video signal, and a detection value of the detection circuit and a reference value set arbitrarily are compared. A three-tube rear-integrated projection television is provided with a comparator and a switch circuit that transmits or cuts off the VM signal to or from the VM coil according to the result of the comparator.
Project from 3 CRTs of red, green, and blue on the screen
VM correction of the difference in spot diameter fluctuations of the three projected lights
A projection TV characterized by being controlled by the amount . 10. A VM coil for performing a VM fixed to a neck portion of a blue CRT, a signal generating circuit for processing a VM signal transmitted to the VM coil for performing a VM from a video signal, and a waveform for generating the VM signal. A modulation circuit that modulates a VM signal, a detection circuit that detects a drive value of the video signal, a comparator that compares the detection value of the detection circuit with a reference value that is set arbitrarily, and the comparator. And a switch circuit for transmitting or shutting off the output signal of the modulation circuit to the VM coil according to the result of 1.
From the three CRTs of red, green, and blue on the screen-type TV,
Difference in spot diameter variation of the three projection lights projected on the lean
A projection television characterized in that is controlled by a correction amount of VM . 11. A VM coil for performing a VM fixed to a neck portion of a blue CRT, a signal generation circuit for processing a VM signal transmitted to the VM coil to perform a VM from a video signal, and an arbitrary waveform for the VM signal. A modulation circuit that modulates a VM signal, a setting circuit that sets an arbitrary value of the gain of an output signal of the modulation circuit, a detection circuit that detects a drive value of the video signal, and a detection of the detection circuit A comparator for comparing the magnitude of the value with a reference value arbitrarily set, and a switch for selecting from an output signal having an arbitrary number of arbitrary values of the setting circuit transmitted to the VM coil according to the result of the comparator Three-tube rear integrated projection TV with circuit
On the screen from three CRTs of red, green and blue in
The difference in the variation of the spot diameters of the three projected lights to be captured is corrected by the VM.
A projection type television characterized in that it is controlled by a positive amount . 12. A VM coil for performing a VM fixed to a neck portion of a blue CRT, a signal generation circuit for processing a VM signal transmitted to the VM coil to perform a VM from a video signal, and an arbitrary waveform for the VM signal. A modulation circuit that modulates a VM signal, a detection circuit that detects a drive value of the video signal, a comparator that compares the detection value of the detection circuit with a reference value that is set arbitrarily, and the comparator. In the three-tube rear-integrated projection television, a control circuit for arbitrarily varying and outputting the gain of the output signal of the modulation circuit is provided according to the result of
Are projected on the screen from three red, green and blue CRTs.
Difference in the spot diameter of the three projected light
A projection type television characterized by being controlled .