JPS60178782A - Monitor picture receiver - Google Patents

Abstract

PURPOSE:To obtain a reproduced picture without sinking and smearing of a black part by shifting a black level to a white level side by setup portion when a video signal without setup is supplied. CONSTITUTION:Three primary color signals R-B from a computer 2 are supplied to a matrix circuit 51 through input terminals 3R-3B and set to red and blue color difference signals R-Y and B-Y, which are supplied to posterior circuits 33-35 through switch circuits 71Y-71B. Afterward a color picture caused by an output of the computer 2 is reproduced on an image receiving tube 38 in the same manner at the the time of receiving television broadcasting. At this time, the specific volume of DC voltage Es from a DC voltage source 52 is supplied as the entire control voltage Ec through a switch circuit 72 and an adder 42. As a result, DC levels of the R-B signals from a signals from an adjusting circuit 36 are shifted by the magnitude corresponding to the voltage Es to a white side.

Description

[Detailed description of the invention] Industrial applications The present invention relates to monitor image reception.

Back type technology and its problems In general, brightness E in television broadcasting is
As shown in A, the actual level is vedestal level and white level (7.5117E4' is 7.5117E4' 4 degrees and 7 degrees (Pb does not beat the horizontal synchronizing pulse)).

However, as shown in FIG. 1B, the luminance signal obtained from a personal computer or a video camera for home use does not have a sesotoa knob, and the actual level corresponds to the pedestal level.

Therefore, in a monitor receiver that has two video input terminals and can select and display a video signal from a television broadcast and a video signal from a personal computer, etc., it is possible to select and display video signals from a personal computer. When the signal is displayed as image I11 and displayed in °C table, that! J4p, i minute sinks or collapses.

OBJECT OF THE INVENTION The present invention attempts to solve these problems.

SUMMARY OF THE INVENTION Therefore, in the present invention, when a video signal without a set amplifier is supplied, its actual level is shifted toward the white level by the amount of the set-up.

Embodiment In FIG. 2, (11 indicates a television tuner device,
This includes everything from an antenna tuning circuit to a video detection circuit, and a color composite signal CMP having a broadcast setup is extracted. In addition, (2) will disable the personal computer and will now output the display (video signal).
As a result, three primary color signals R, G, and B without a cent amplifier are output.

Furthermore, (31 indicates a monitor receiver according to the present invention).

In this receiver (3), (31) is Y/C
Separation circuit, (32R) and (32B) are color primaries δlld
The circuit, (33) is the hue adjustment circuit.
) is the color difference between red and blue (A (R, -Y), (B-Y)
When is done manually, xt=l(RY)+α(B Y))/rX2 = +
(B-Y) -(X (R-Y) l, /i Mitsu-1
The signals XI and X2 shown by ≦α≦ are converted into new color difference signals (R-Y).
, (B-Y) and outputs 'C', therefore, the output color difference signal (R-Y).

(B - Y) is subjected to hue adjustment corresponding to the coefficient α.

Further, (34) is a matrix circuit, (35) is a color adjustment circuit, and in this adjustment circuit (35), °ζ is y1
=β(R-Y)+Y y2-β(G-Y)→-Y y3-β(B-Y)+Y O≦β≦1 The signals y1 to y3 that are deleted are converted into new color signals R and G.

Therefore, the output R-B is subjected to color adjustment in accordance with the coefficient β.

Furthermore, (36) is a brightness adjustment circuit, and this adjustment circuit (36) is a brightness adjustment circuit.
6), the DC voltage from the manual variable DC voltage source (41) is passed through the adder circuit (42) as the control voltage Ec (J(
When the voltage Ec increases, this adjustment circuit (3
6) is controlled so that the DC level of the signal R-B passing through is shifted to the white level side.

Further, (43) is an ABL detection circuit, and this detection circuit (43) is an ABL detection circuit.
In 3), by detecting the high voltage current of a fly bank transformer (not shown), the ABL voltage whose level decreases when a high brightness part continues on the playback screen is extracted.
It is supplied to this AB'L lightning voltage addition circuit (42).

Furthermore, (51) is a matrix circuit, (70) is an input selector switch, and the output S of this sui nochi (70) is
s is a switch circuit (71Y), (71R).

(71B) and (72) as their control signals, and the switch circuits (71Y) to (72)
When SS="0", the state shown in the figure is established, and when SS="1", the state shown in the figure is reversed.

When receiving TV broadcasts, switch (7)
0) is turned on and Ss-"0" is set.

That is, in this case, the color composite signal CMP from the tuner device (11) is supplied to the "iZY/C separation circuit 12 & (31) through the input terminal (3C), and is outputted as the luminance signal Y and the color sending signal C (11!). The signal Y passes through the switch circuit (71Y) to the circuit (34).

(35).

In addition, the carrier color (g number C) from the separation circuit (31) is fed to the color demodulation circuit (32R), (32B) and the red and blue color difference signals (R-Y), (B-Y). is demodulated, and these signals (R-Y) and (B-Y) are sent to the switch circuit (71
1? ), (71B), and then the hue adjustment circuit (3
3) is supplied to the matrix circuit (34).

Then, in the matrix circuit (34), the signal Y,
(R-Y), (B-Y) to color difference signal (RLY), (G
-Y), (B-Y) are formed and the color adjustment circuit (35
), and the signal R-B from this adjustment circuit (35)
is the brightness adjustment circuit (36) and drive amplifier (37R)
~ (37B) are supplied to the color picture tube (38), and a color image by broadcasting is reproduced.

At this time, the output voltage of the voltage source (41) is supplied to the adjustment circuit (36) as a DC level control voltage Ec through the adder circuit CA,l), so the output voltage of the voltage source (41) is changed. This changes the brightness.

On the other hand, when displaying the output of computer (2),
The switch (70) is turned off and SS-“1” is set.

That is, in this case, the three primary color signals R-B from the computer (2) are supplied to the matrix circuit (51) through the input terminals (3R) to (3B), and the luminance signal Y and
The red and blue color difference signals (R-Y), CB-Y) are used, and these signals Y~(B-Y) are sent to the switch circuit (71Y)~
(71B) to the subsequent circuits (33) to (35), and thereafter, the color image output from the computer (2) is reproduced on the picture tube (38) in the same manner as when receiving television broadcasting.

At this time, a DC voltage Es of a predetermined magnitude is supplied from the DC voltage source (52) through the switch circuit (72) and further through the adder circuit (42) as part of the control voltage Ec. Therefore, the DC level of the signal R-B from the adjustment circuit (36) is shifted toward the white level by an amount corresponding to the voltage ES, so that the dot portion of the playback screen also
It changes to a brighter direction by the size corresponding to tlishoEs, so that the dot part does not sink or collapse.

Note that at this time, each time the DC level of the signal R-B is shifted toward the own level, the own level tends to become further lower, but this is corrected by the ΔBL detection circuit (43).

Thus, according to the present invention, it is possible to obtain a reproduced image without sinking or wobbling in dot portions, whether it is a video signal with a set-up or a video signal without a center amplifier.

Effects of the Invention It is possible to obtain a playback screen without any sag in the dots, whether it is a video signal with a set-up or a video signal without a set-up.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining this invention, and FIG. 2 is a system diagram of an example of this invention. (1) Hatuna device, (2) a personal computer, (33) a hue adjustment circuit, (35) a color adjustment circuit, and (36) a luminance fIl11 adjustment circuit.

Claims (1)

[Claims] a first video signal having a set-up at the actual level;
A second video signal without nano 1-up is supplied at the actual level, these first and second video signals are selected and displayed as an image, and the second video signal described in - is displayed as an image. The monitor receiver is configured to reshift the actual level of the second video signal to the white level side by a set-up amount.