JPH02158792A - Display device consisting of cathode ray tube - Google Patents

Abstract

PURPOSE:To improve electric power consumption and to make good video display by connecting the earth side end of a wide band video output circuit via a diode to the 1st grid of a cathode ray tube. CONSTITUTION:The signal output side ends 1R, 2G, 3B of the wide band video output circuit are so connected as to obtain wide band video signals in cathodes 4R, 4G, 4B of the cathode ray tube 4; in addition, the earth side ends 1A to 3A of the wide band video output circuit are connected to the cathode of a diode 9 and the anode of the diode 9 is connected to the 1st grid 6 of the cathode ray tube 4. The diode 9 is, therefore, made conducting in the signal period of the video signals and the diode 9 is made nonconducting in the blanking period of the video signals. The wasteful electric power consumption of the blanking period is eliminated and the good video display is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode ray tube display device for displaying a wideband video signal suitable for use in computer display devices and the like.

[Summary of the invention]

The present invention relates to a cathode ray tube display device for displaying a wideband video signal suitable for use in computer display devices, etc., in which the signal output side end of a wideband video output circuit designed to obtain a wideband video signal is connected to the cathode of the cathode ray tube. At the same time, the ground side end of this broadband video output circuit is connected to the cathode of a diode, and the anode of this diode is connected to the first grid of this cathode ray tube. A DC bias voltage is supplied to make the diode conductive, and the diode is made non-conductive during the blanking period of the video signal. By supplying a ranking signal, it is possible to improve power consumption and provide good video display.

[Conventional technology]

Generally, in computer display devices and the like, cathode ray tube display devices that display wideband video signals are used to obtain high image quality. In the video output circuit that drives the cathode ray tube display device that displays such wideband video signals, it is necessary to amplify high frequencies, so the output impedance must be reduced, and the load resistor of this video output circuit is The resistance value is relatively small. When the output video signal of this video output circuit is supplied to the cathode of the cathode ray tube, the resistance value of the load resistor is relatively small, so a relatively large current flows through the load resistor during the blanking period of this video signal. However, there is a disadvantage that the power loss increases accordingly.

Therefore, in order to improve this power loss, a cathode ray tube display device as shown in FIG. 4 has been proposed.

That is, in FIG. 4, (1), (2) and (3) are red, green and Indicates the blue video signal connector, this connector (1)
, each signal side end (IR) of (2) and (3),
(2G) and (3B) are connected to the red, green and blue video signal output ends of the video output circuit, respectively, so that the red, green and blue video signals are supplied, respectively, and this connector (1), The earth side end (IA) of each of (2) and (3).

(28) and (3^) are connected to the ground side end of the video output circuit, respectively. This connector (1).

The signal side end (IR) of (2) and (3), (2
G) and (3B) are respectively high resolution color cathode ray tubes (4
) are connected to the red, green and blue cathodes (4R), (4G) and (4B) respectively, and these connectors (1), (
The ground side ends (IA), (2A) and (3A) of 2) and (3) are connected to the first grid ( 6), and connect this ground side end (1Δ), (2
A) and (3A) and capacitor (5R), (5G)
and (5B) with a resistor (7R),
(7G) and (7B), and connect the connection point between these capacitors (5R), (5G), and (5B) with the first grid (6) to the block of the video signal supplied to the video output circuit. Connected to a blanking signal input terminal (8) to which a blanking signal with a ranking period set to a predetermined value, for example -60V, is supplied, and the first grid (6) of the color cathode ray tube (4) is A negative blanking signal is supplied to bias the first grid (6) in the negative direction during this blanking period to eliminate the current of the video output circuit during the blanking period of this video signal, and this blanking I was trying to avoid unnecessary power consumption during the period.

[Problem to be solved by the invention]

In a conventional cathode ray tube display device as shown in FIG. 4, a color cathode ray tube (4
) must be connected to the ground side end of the video output circuit when viewed from an AC (video signal) perspective, and when viewed from the blanking signal input terminal (8) side, this color cathode ray tube It is preferable that nothing other than the blanking signal be supplied to the first grid (6) in (4). For this reason, conventionally the first grid (6) of this cathode ray tube (4) is connected to the ground side end of the video output circuit using small capacity capacitors (5R), (5G), (5B), and The impedance was set to be low for blanking signals, and the impedance was set to be as high as possible for blanking signals. However, the blanking signal generation circuit that generates the blanking signal to be supplied to the blanking signal input terminal (8) has an impedance (8a) and a capacitor (
Since one end of (5R), (5G), (5B) is grounded via the earth side end (IA), (2A), (3A) and the earth side end of the video output circuit, the fifth
As shown in the figure, the impedance (8a) and capacitor (5R) of this blanking signal generation circuit, (5G)
, (5B) constitutes an integral circuit as an equivalent circuit, and this blanking signal is integrated and this blanking signal is delayed, and this blanking signal affects the effective screen, making it impossible to obtain a good image display. was there.

In view of these points, it is an object of the present invention to improve power consumption and obtain good video display.

[Means for Solving the Problems] The cathode ray tube display device of the present invention has a cathode (4R), (4G), (
(IR), (2G), (2G), (2G), (2G), (2G),
3B) and the ground side end (IA) of this broadband video output circuit (2^).

(3Δ) is connected to the cathode of the diode (9), the anode of this diode (9) is connected to the first grid (6) of this cathode ray tube (4), and this diode (
9) is supplied with a DC bias voltage that makes this diode (9) conductive during the signal period of the video signal, and during the blanking period of this video signal, this diode (9) is
are made non-conductive, and the ground side terminals (LA), (2A), (3A) of this broadband video output circuit and the cathode ray tube (4
) is supplied with a blanking signal that insulates the first grid (6) from the first grid (6).

[Effect]

According to the present invention, the signal period of the video signal is connected to the diode (
9) becomes conductive, so the first grid (6) of the cathode ray tube (4) seen from the wideband video output circuit is the ground side end (IA), (2A), (2A) of this wideband video output circuit.
(3A), and during the blanking period of this video signal, the diode (9) becomes non-conductive and connects to the ground side end (IA), (2A), of the broadband video output horn circuit.
(3A) and the first grid (6) of the cathode ray tube (4) are insulated, so only the blanking signal is supplied to the first grid (6), and this blanking period is wasted. This reduces power consumption and allows for better image display.

(Embodiment) An embodiment of the cathode ray tube display device of the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those in FIG. 4 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this example, the red, green and blue video signal connectors (
1), (2) and (3) are respectively connected to the output side of a wideband video output circuit that amplifies the wideband video signal,
The signal side ends (IR), (2G) and (3B) of these connectors (1), (2) and (3) are respectively connected to the red, green and blue video signal output ends of the wideband video output circuit, This signal side end (IR), (2G) and (3
B) is supplied with red, green and blue video signals, and the ground terminals (IA), (2A) and (3A) of these connectors (1), (2) and (3) respectively are used as broadband video outputs. Connect to the earth side end of the circuit so that the second earth side ends CIA), (2A) and (3A) are grounded.

In this example, these connectors (1), (2) and (3)
), the respective signal side ends (IR), (2G) and (3B
) are connected to the red, green and blue cathodes (4R), (4G) and (4B) of the high-resolution color cathode ray tube (4), respectively, and these connectors (1), (2) and (3)
), respectively, the ground side ends (IA), (2A) and (3
8) respectively to the cathode of the diode (9), and the 7 nodes of this diode (9) are connected to the color cathode ray tube (4).
) is connected to the first grid (6) of the diode (9), and the anode of this diode (9) is supplied with a voltage of, for example, 12V for DC bias to make this diode (9) conductive through a resistor (10). DC bias supply terminal (11
). This diode (9) and resistor (10
), the signal period of the video signal supplied to the video output circuit via the DC blocking capacitor (12) is, for example, 0.6■, and the blanking period is set to a predetermined value, for example, -6.
It is connected to a blanking signal input terminal (8) to which a blanking signal of 0V is supplied.

Since this example is configured as described above, during the signal period of the video signal supplied to the wideband video output circuit, the current from the DC bias supply terminal (11) flows through the resistor (10),
Diode (9), ground side end (18), (2A).

(3^) and the flow diode (9) become conductive, so the first grid (6) of the color cathode ray tube (4) seen from the wideband video output circuit is the ground side end of this wideband video output circuit. At this time, red, green, and blue video signals from the wideband video output circuit are properly supplied to the color cathode ray tube (4), and a good video display is performed.

Also, during the blanking period of the video signal supplied to this wideband video output circuit, the anode of this diode (9) is supplied with a voltage of 60V, which is one of the blanking signals, so this diode (9) has a DC bias of 12V. It becomes non-conducting regardless of the voltage, and the ground side end of this broadband video output circuit, that is, the connectors (1), (2),
The ground side ends (lΔ), (28), (38) of (3) are electrically insulated from the first grid (6) of the color cathode ray tube (4), and this -60V blanking The signal is supplied to the first grid (6), which allows current to flow through the load resistor during the blanking period in the wideband video output circuit, thereby eliminating unnecessary power consumption. In this case, a DC blocking capacitor (12) is provided, but the equivalent circuit seen from the blanking signal input terminal (8) during this blanking period does not become an integrating circuit as shown in Figure 2; There is an advantage that good video display can be obtained without delay (and this blanking signal does not affect the effective screen).

Further, FIG. 3 shows another embodiment of the present invention, and in this FIG. 3, the ground side ends (IA), (2^) of the connectors (1), (2) and (3), respectively and (3A) are connected to the cathodes of diodes (9R), (9G) and (9B), respectively, and the second class diodes (9R), (
The anodes of diodes (9G) and (9B) are connected to resistors (13R) and (13G) that correct for variations in the characteristics of the diodes (9R), (9G), and (9B), respectively.
, (13B) and capacitor (14R), (14
G) and (14B) are connected to the first grid of the color cathode ray tube (4) through parallel circuits, and the other configuration is the same as in FIG. 1.

In the example shown in FIG. 3 as well, during the signal period of the video signal supplied to the wideband video output circuit, the diode (
9R), (9G) and (9B) are respectively in a conductive state, and during the blanking period of this video signal, the blanking signal causes these diodes (9R), (9G) and (9B) to be in a non-conductive state, respectively. Since this blanking signal is supplied to the first grid (6), the same effect as the example in FIG. 1 can be obtained in the example in FIG.
Also, in this example in Fig. 3, the ground side end (lA),
(2A) and (3A) are each a diode (9R).

(9G) and (9B), and the anode sides of these diodes (9R), (9G), and (9B) are connected to the first grid (6), so that the red, green, and blue video signals are connected to each other. This has the benefit of eliminating crosstalk.

It goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, wasteful power consumption during the blanking period of the video signal can be avoided, and a good video display can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the cathode ray tube display device of the present invention, FIG. 2 is a line diagram for explaining FIG. 1, and FIG. 3 is a block diagram showing another embodiment of the present invention. FIG. 4 is a block diagram showing an example of a conventional cathode ray tube display device, and FIG. 5 is a diagram for explaining FIG. 4. (1), (2) and (3) are connectors, (IR) respectively.
, (2G) and (3B) are the signal side end, (LA) respectively.
, (2A) and (3A) are the ground side ends, (4)
are color cathode ray tubes, (4R), (4G) and (4B
) is the cathode, (6) is the first grid, (8) is the blanking signal input terminal, (9), (9R), (9
G), (9B) is a diode, and (11) is a DC bias supply terminal.

Claims (1)

[Claims] The signal output side end of a wideband video output circuit designed to obtain a wideband video signal is connected to the cathode of the cathode ray tube, and the ground side end of the wideband video output circuit is connected to the cathode of a diode, and the anode of the diode is connected to the cathode ray tube. A DC bias voltage is supplied to the diode so that the diode becomes conductive during the signal period of the video signal, and the diode is rendered non-conductive during the blanking period of the video signal. A cathode ray tube display device, characterized in that the cathode ray tube display device is configured to supply a blanking signal for insulating the ground side end of the broadband video output circuit and the first grid of the cathode ray tube.