JPS5995787A - Color video display device - Google Patents

Abstract

PURPOSE:To provide a color to a character or a bar with a simple circuit constitution by superimposing a luminance signal corresponding to a character or the like on a color video signal and subtracting a color signal. CONSTITUTION:A color video signal Sv obtained from a detecting circuit 4 is applied to a superimposing circuit 6, where a picture signal Sv and luminance signals SCHA, SBAR in which parts corresponding to the character or the bar to be displayed are brought into a high level are superimposed. When the luminance signals SCHA, SBAR corresponding to the character and the bar are superimposed on the picture signal Sv, a transistor 27 is turned on to apply blanking to the signal Sv. A superimposed signal S'v is applied to a matrix circuit 32 via a color demodulating circuit 31. A subtracting circuit comprising transistors 55R-55S subtracts a signal corresponding to the luminance signal to the character and bar from a color signal of the matrix circuit 32. For example, in case of bar display, the transistor 55R is turned on in response to the bar signal SBAR applied to a terminal 36 to interrupt a red signal and the bar is displayed in cyan.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a color video image suitable for use in a television receiver that displays characters such as channels and bars such as volume on the screen. 151 □ BACKGROUND TECHNOLOGY AND PROBLEMS Traditionally, as shown in Figure 1, television receivers have been designed to display characters such as channels and bars such as sounds superimposed on images on the screen. ('Ji4. is proposed.

In this case, methods for superimposing character signals for character display or bar display include superimposing them on the color video signal that is the detector output, and superimposing this color video signal on the color signal obtained by signal processing. method is used.

In the former case, to color the displayed characters and bars,
Burst signals must be superimposed, and multiple Xm circuits are required.

On the other hand, in the latter case, it is easy to color the displayed characters and bars. However, depending on the output timing of the character generator that outputs the character signals, the character signals may be output even during the blanking period on the receiver main body side, and a blanking line may be displayed. The tanu circuit that blanks the letters, etc. 4g number between "horizontal planking gel" is safe and the circuit becomes complicated.

In the latter case, you can adjust the brightness by using the picture control on the receiver itself. difficult to do. Furthermore, in order to superimpose a character signal for displaying white characters, bars, etc., the white balance adjustment signal V, V of the signal to be superimposed must be
’H is required.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is designed to allow displayed characters and bars to be colored using a simple circuit.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a color video display in which a color video signal is processed to produce a color signal, and a color line tube is driven by this color signal. In the apparatus, the luminance signal corresponding to the color video signal 1 (characters, etc.) is superimposed, and the signal corresponding to the luminance signal is subtracted from the upper two color signals.

The present invention is configured as described above, and characters are added to the color video signal.
It multiplies the luminance signal of 1 core per 4 yen and adds color to the displayed characters and bars by subtracting the color signal, and has a simpler configuration than the above-mentioned Ue conventional example. can do. This is a great feature because it subtracts color signals, so it is relatively easy to select colors to add.

Embodiment Hereinafter, an embodiment of the invention will be described with reference to FIG.

In the same figure, il+ is an antenna, (21 is a tuner. The intermediate frequency signal from the tuner (2) is amplified by an intermediate frequency amplifier (3), and then the video detection circuit (4)
). The color video signal SV obtained from this detection circuit (4) is supplied to a superimposition circuit (6) via a buffer circuit (5). fNl] Detection circuit (4)
The color image signal Sv obtained from 1. is applied to the base of the npn transistor (8) constituting the circuit (5) via the resistor (7). 8) collector is +1L missing M + h child (9) J
Ifi#jp is output, and its emitter is grounded by a resistor ([0). The color video signal Sv inputted to the connection point P1 between the emitter of this transistor (8) and the resistor 5tIO+ is sent to the superimposition circuit (6) via the resistor till.
is supplied to the base of the n-type transistor (12) that constitutes the former) n-type transistor (12).

In addition, (IJ is an np type transistor, and the 1n signal superimposed on the color video signal Sv is supplied to the base of this transistor. Through this transistor (the collector of 131 is between the resistor), the iT im, terminal (9) is connected to the emitter of the transistor (121), whose emitter is connected to the emitter of the transistor (121), and this connection point P2 is grounded via the resistor (15).

In addition, tte is a terminal to which a brightness signal, the so-called fixed character bait signal 5Ci (A), whose part corresponding to the character J to be displayed is at a high level, is supplied.This terminal +161 is connected to a transistor ( It is connected to the base of I31, and the character signal 5CHA is supplied to the base of transistor 03).

In addition, a resistor fi is connected between the fire source terminal (9) and (Zf4h).
81! 1 and npn transistors 120) are turned on to one side, and resistors 181 and 1. i
The connection point of l) is a transistor (1310 base to 394
be mediated. Then, the collector of the transistor Coi+) and the resistor (from the junction d'je point of 19)
Terminal +221 is output via the terminal. This terminal (221
is supplied with a luminance signal whose portion corresponding to the displayed bar is at the sieve level, a so-called bar signal 5BAR, and the bar signal 5BAR is supplied to the base of the transistor (13).

In addition, (2 is a terminal to which the display mode signal SMO is supplied t!f!, and this terminal ('!3) is a transistor (2
■Be connected to the base. In this case, display mode signal S
When MO is at a high level, the transistor +;0) turns on, so the bar signal 5BAR is the transistor (13).
The color video signal Sv is not supplied to the base of the character signal 5CHA, and only the character signal 5CHA is iF-folded to the color video signal Sv. On the other hand, the display mode signal 8MOl! l″-When the level is low, the transistor (2
Since (j is turned off, the bar signal 5BAR is also supplied to the base of the transistor (131), and both the character signal 5CHA and the bar signal 5BAR are superimposed on the color video signal Sv.

From the terminals (24j and (251), character signal 5CH
A and the bar signal 5BAR are supplied to an OR circuit t26), and the output of this OR circuit 4 is supplied to the base of an npn transistor I27) constituting a blanking circuit.

The emitter of this transistor (27)l is grounded, and its collector is connected to the connection point P1 via a resistor (in this case, the character signal 8CHA or) - the signal 5
When BAR is superimposed on the color video signal Sv Ic, the transistor K (2n) is turned on, so the color video signal Sv is blanked.

The superimposition circuit (6) is formed by h°3 as described above, and the connection point P
2, a color video signal Sv' on which a character signal 5cHA and a bar signal 5BAR are superimposed is obtained. This color image signal Sv' is supplied to a band-pass filter 0 for extracting color signals, and a color signal C is obtained. This color signal C is amplified by an amplifier (30) and then supplied to the color demodulation circuit Oυ, where the red difference (ratio -Y), blue difference (+3-Y) and green difference (G-Y) signals are generated. Obtained, ma) IJx circuit (
321. The luminance signal Y that remains after the color signal C is extracted from the color video signal Sv' is passed through a delay circuit (33) for adjusting the time of the color signal C, and then amplified by an amplifier t34) to form a matrix. circuit (supplied in three).

Then, this matrix circuit (terminal (32) 1 of 321
), (32B) and (32G) have red lights, respectively.
A blue signal and a green signal are obtained, and each color drive circuit li! drives a color shaded line tube (not shown). Be supplied to 3 (without 1).

1. C(5) is a variable resistor for picture control, and the voltage obtained at the movable element (35a) is supplied to the amplifiers (30) and (34) as a gain control voltage.

Therefore, picture control can be performed by adjusting the position of the movable element (35a).

In the 1751 path described above, the character bar code 8CHA and bar signal Sv are superimposed on the color video signal Sv.
BAR is a high-level luminance signal, so the characters and bars displayed on the screen are white.
By subtracting the color code obtained from 2B) and (32G), characters and bars can be colored.The circuit will be explained below.

In Fig. 2, the bar signal 5BAR that is the same as that supplied to the terminal (22) is supplied to Hamako (361).This bar signal 5BAR is outputted, for example, during picture control and sound control, respectively. A bar is displayed according to the amount of blind rules.

The bar signal 5BAR supplied to this terminal C1bl is passed through a delay circuit (3n) to an AND circuit (rod and (, 3al K
Supplied. The delay circuit G゛O is for Lm adjustment between the bar signal "BAR" and the color signal obtained from the matrix circuit. is,
This t is supplied to an AND circuit (38). The output of this AND circuit 1 is supplied to an OR circuit (41). 'Also, the terminal +421K is supplied with a signal SVL that becomes high level when the sound is controlled, and this is connected to the AND circuit (3
91. The output of this AND circuit t3!1 is supplied to the OR circuit (All and (4).

In addition, the character signal 5clIA, which is the same as that supplied to the terminal (tta), is supplied to the terminal (listening).In the case of two-audio multiplex broadcasting, the letters 'D', 'X', and 'J' are For stereo audio multiplex broadcasting, select "S i" E H.
The characters EUJ are displayed. This terminal (14
), the character signal 8CHA is supplied to the AND10 circuit j41i1 and (4θ) via the delay circuit (4).The delay circuit (1ω is the color signal obtained from the character signal 5CHA and the matrix circuit c+2). The time W!!,! is in order.The signal SMPX, which becomes a light level during two-audio multiplex broadcasting, is supplied to the terminal (・1ω, and this is supplied to the AND circuit #j (4G+). Circuit (4 (output of 4 is supplied to OR circuit (43), terminal +, f
! + is supplied with a signal 5STEREO that becomes high level during stereo audio multiplex broadcasting, and this is fed to the AND circuit (47).
supplied to The output of this AND circuit (IA) is supplied to the OR circuit Gl:(1 and (50)).

Unfortunately, the terminal Gυ is supplied with a character signal 5CHA which indicates the same channel as that supplied to the terminal (L6).

This character signal 5CHA is supplied to the AND circuit C through delay circuits (5).Delay circuit 2 is used for ill adjustment when character signal 5CHA for channel display and color signal obtained from matrix circuit (321 The signal 5cHA, which becomes high level when displaying the channel, is supplied to the terminal 15 and υ, and this is supplied to the AND circuit 6y.
hru. The output of this AND circuit 63) is the OR circuit (41)
and (511).

The outputs of the OR circuit (41), flit and (5(D) are supplied to the pace of npn transistors (55K), (5513) and (55G) for the red, blue and green sides, respectively. (55■7), (55B
) and (55G) are connected to the matrix circuit (32 terminals (321), (32B) and (32G) via resistors (56), (56B) and (56G), respectively.
) K connection, and each emitter is connected to Bp ground.

The present example is configured as described above, and during picture control, the output of the AND circuit (3al becomes high level) in response to the bar signal 5BAR indicating the picture control amount supplied to the terminal (1' (6)). , OR times h% ((The output of Q becomes high level, and the transistor (
551 is turned on, and the matrix @ path (3Δ terminal (
The red signal obtained at 32a) is no longer supplied to the drive circuit. This hole, OR circuit (4:ri and 1゛...(
The output of 1) is low level and the transistor (5513)
and '0: (55G) is off, and the blue signal and green signal obtained at the terminals (3213) and (32G) of the matrix circuit (321) are fed to the luxury drive circuit, respectively. After all, during this picture control, a blue signal and a green signal are respectively supplied to the drive circuit according to the bar signal 5BAR displayed by the picture control, so the bar indicating the picture control amount is displayed in cyan on the screen. Unfortunately, when controlling the volume, the sound supplied to the terminal (G)
In response to the bar signal 8BAR indicating the control control, the output of the antenna l'a becomes high level. Therefore, the outputs of the OR circuit (41) and (2) become high level, the transistors (55R,) and (55B) turn on, and the matrix circuit (3 terminals (32H) and (32B)
The red and blue signals obtained at the time are no longer supplied to the drive circuit. In this case, the output of the OR circuit 60) is at a low level, the transistor (55G) is off, and the green signal obtained at the matrix circuit terminal (32G) is then supplied to the drive circuit. After all, during this volume control, a green signal is supplied to the drive circuit in response to the bar signal 5BAR indicating the amount of volume control, so that a bar indicating the volume control idea is displayed in green on the screen. It's a fu, when two-audio multiplex broadcasting,
AND circuit 16! in response to the character signal 5CHA which displays the characters [M P XJ] supplied to the terminal (44). output will be at a high level. Therefore, the output of the OR time %f431 becomes high level, the transistor (55B) turns on, and the blue color (g) obtained at the terminal (32B) of the matrix circuit (321) is no longer supplied to the drive circuit F@.At this time, OR circuit (shun and (5t1+ output is low level, transistor C55E3.) and rfi (55
G) is off, and the terminal (32
The red signal and the green signal obtained at 1 (,) and (32G) are supplied to the drive circuit as they are. in the end.

During this two-audio multiplex broadcast, a red signal and a frame signal are supplied to the drive circuit in response to the character signal 8CHA indicating the characters "MPX", so that the characters "MPXJ" are displayed in yellow on the screen. . 1, during stereo multiplex broadcasting, it should be supplied to terminal 14) "S 'I1." E R
J6 U J 6') Character to display character 1g No. 5c
In response to FTAK, the output of the AND circuit r47) becomes high level. Therefore, the outputs of OR circuits f43) and 61p become high level, and the outputs of transistors (55B) and (55G)
is turned on, and the matrix circuit (321 terminal (321
3) and (32G?) blue signal and green 4g obtained
Is the issue the drive episode? , 6 will no longer be supplied. At this time, the output of the OR circuit 140 is at a low level, and the transistor (
551(,) is off, and the red signal obtained at the terminal (32) of the matrix circuit C32+ is supplied to its sweet drive circuit. In the end, during this stereo multiplex broadcast, the character signal 5CH displaying the characters [5TEI:IOJ]
A red signal is supplied to the drive circuit in response to A.
, the characters ls'l'ERF30J are displayed in red on the screen. At the time of channel display, the output of the AND circuit 531 becomes high level in response to the character signal 5CHA for channel display supplied to the terminal (51). Therefore, the OR circuit (41) and (:5 (11) are at high level, the transistor (55)) and H (55G) are turned on, and the terminals (32R) and (32R) of the matrix circuit E are turned on.
The red signal and green signal obtained at 2G) are supplied to the drive circuit. At this time, OR circuits 1 and 13)
The output of is low level, the transistor (5sB) is off, and the blue signal obtained at the terminal (32B) of the matrix circuit C3 is supplied to its 11 drive circuit. After all, when this channel is displayed, the character signal 5cI (yellow number 4g) is sent to the drive circuit in response to the channel display, so the channel is displayed in blue on the 5 screen.

According to this disadvantage, when the color sleep image signal Sv is folded with the character signal 5CHA and the bar signal 5BAR,
M) IJx circuit (32) Colors the displayed characters and bars by subtracting the color signal obtained from 32, and is a complex circuit that superimposes a burst signal on the conventional Yomiuri, character, etc. signal. Moreover, it does not require blanking circuits for characters, etc., separately from the main body side, and can be configured as a simple fm circuit. Unfortunately, since the color signals are subtracted, it is extremely easy to select the color to be colored.

Incidentally, in the above embodiment, the color A A C & H luminance signal Y
K-minute color video before panting! Character signal 5C to signal Sv
Although the HA and bar signals 5I3AR are superimposed 1 to 1, they may be separated into luminance signals YK and 2. In the above embodiment, the transistor (5
5R・), (55B), and (55G), but these transistors (5R・), (55B), and (55G) are
If 5 (Mo), (5513) and (55G) are made to operate in the active area, it will be possible to add even more different colors to characters and bars.

Further, in the above embodiment, the +1x circuit 67
This is the result of subtracting the primary color signal obtained from J.
It is also conceivable to perform subtraction processing on the color difference signals from the color demodulation circuit (31).

Application Examples The present invention can be applied not only to color television receivers but also to color display devices such as projectors having color cathode ray tubes.

Effects of the Invention According to the present invention described above, the characters and bars to be displayed are colored by superimposing the Misaki signal corresponding to characters etc. on the color video signal and subtracting the color signal. , it is possible to have a simpler circuit configuration than the conventional one.

This is naive, since the color signal is subjected to subtraction processing, it is possible to relatively easily select ε1 colors to be colored.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the present invention, and FIG. 2 is a diagram showing an embodiment of the present invention. (6) is a q-tatami circuit, (321 is a matrix circuit, (55
kL) (55B) and (55G) are transistors for color control, SV is a color video signal, 5CHA is a character signal, and 5BAR is a bar signal.

Claims (1)

[Claims] In a color video display device that processes a color video signal to obtain a color signal and drives a color cathode ray tube with this color signal, the color video signal is injected with a luminance signal corresponding to characters, etc. A color video display device (equipment) configured to subtract a signal corresponding to the 1-variant signal from the color signal.