JPS5939179A - Large-sized video image display device - Google Patents

Abstract

PURPOSE:To attain the video image display, by providing a high frequency generator energizing discharge lights and operating/stopping the generator according to a video signal so as to make the impressed phase of a high frequency voltage to the discharge lights constant at all times. CONSTITUTION:A controller 151 is selected for the discharge light, e.g., 11 according to the video signal from a video signal generator 7 and the controller 151 outputs a signal determining the operation/stop of a high frequency generator 31 in response to a signal from an A/D converter 14. Further, a switch 61 is turned on and off with a signal from the controller 151 to control a base current of a transistor (TR) in the generator 31. Then, the generator 31 is activated while the switch 61 is opened only and energizes the discharge light 11. When the video signal represents a high luminance, the operating time of the generator 31 is made longer and when a low luminance, the operating time is decreased. Further, the discharge lights 12-1n are controlled respectively with controllers 152-15n and the luminous amount in response to the video signal is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large-sized video display device in which a large number of single-emission type display elements are arranged and the amount of light emitted by each display element is controlled to display images such as television signals.

Traditionally, this type of display device has been replaced with a light bulb,
One that uses a cathode ray tube is known.

However, those using light bulbs have problems in that they consume a lot of power and generate a lot of heat due to poor luminous efficiency, and also have the problem that the color of the emitted light is reddish. Those using cathode ray tubes have the problem of being expensive and difficult to obtain a sufficient amount of light.

In response to this, a method using a C fluorescent lamp as a display element has been proposed (IJJ Publication No. 46-5894, Japanese Patent Publication No. 48-30797). Those using fluorescent lamps consume less power than fluorescent lamps, can relatively easily obtain the desired luminous color, and are cheaper than cathode ray tubes and can provide sufficient light. However, in the above cited document, the fluorescent lamp is lit with DC' voltage, so
A resistor is used as a current limiting device. Therefore, the power loss in one pile is large, and the amount of heat generated is also large.

The present inventors have proposed a large-sized video display device that can solve the problems of conventional devices as described above and also has good responsiveness to video I signals (Japanese Patent Application No. 130579/1982).
. This device has a display element that includes a discharge lamp such as a fluorescent lamp and a high-frequency generator that energizes the discharge lamp, and as described above, it can solve the conventional problems and also It has good responsiveness and is effective.

The present inventors have proposed -C in the above-mentioned Japanese Patent Application No. 57-1.30579
As a result of researching the large image display device proposed by 4U, I found out that it is a discharge lamp? It has been revealed that when the light is dimmed deeply depending on the image direct number, the light output may be uneven among multiple discharge lamps, or the light output may fluctuate even among the same discharge lamps. The reason for this is that the phase of the high-frequency voltage applied to the discharge lamp depending on the video signal differs between multiple discharge lamps, or that the phase of the high-frequency voltage applied to the same discharge lamp does not always match. This is to do so. In other words, as is well known, when starting and re-igniting a lamp, a higher voltage is required than the voltage of the lamp (voltage), but starting or re-igniting depends on which phase the high-frequency voltage is applied to the lamp. The time to arc is different, and the inductor and capacitor as current limiting devices cause the inlet/voltage and the first lamp current to be out of phase. The difference is the lamp current, or light output.

The present invention has been made in consideration of such circumstances, and it is possible to keep the applied phase of the high frequency voltage to the discharge lamp extremely constant, and to
The object of the present invention is to provide a large-sized video display device that can stabilize optical output and display high-quality video.

The present invention includes a display element including a discharge lamp and a high-frequency generator that energizes the discharge lamp, and controls the operation and stopping of the high-frequency generator in accordance with Video No. 11. It is characterized by the fact that

Since the present invention controls the operation and stop of the high-frequency generator according to the video signal, the high-frequency voltage can always be applied to the discharge lamp from a predetermined phase, that is, from the oscillation start phase. Therefore, at the same dimming level, the light output can be made uniform among a plurality of discharge lamps, and the light output can be stabilized even when the same discharge lamp is used.

In the present invention, the video 1 word is a continuous signal obtained by scanning the image, and the lighting time of each eccentric lamp υ is determined according to this video signal. In addition, the video signal is a television signal or a video l signal.

For video signals etc., either black and white or color No. 1a C is suitable.

Further, in the present invention, the high frequency generator can be constructed using a self-excited inverter. In this case, the supply of human power or controlled one word to the self-excited inverter is
The activation and stopping of the high frequency generator can be controlled by controlling according to the signal. Further, the high frequency generator can be configured using a controlled LA generator and a separately excited inverter. In this case, by controlling the operation of the control signal generator according to the video signal, it is possible to control the operation and stop of the high frequency generator. One high-frequency generator can be provided in one-to-one correspondence with a discharge lamp, or one in correspondence with two or more discharge lamps or wax lamps. Further, the output frequency of the high frequency generator is several hundred Hz or more, preferably 20KHz to 50K, as in the above patent application.
It is Hz.

Furthermore, in the present invention, the discharge lamp includes a fluorescent lamp,
A neon tube or the like can be used.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4. Numerals (1,) to (111) are discharge lamps, such as fluorescent lamps, which are arranged in large numbers on the display panel (2).

The display panel (2) is installed at a baseball field or the like, and the discharge lamps (1,) to (In) are installed in dozens or more. (31) ~ (3n) is 1 front d self-emission light (1+)
A high frequency generator that energizes the radiator lamps (11) to (lrl) in this embodiment, in one-to-one correspondence with the radiator lamps (11) to (lrl). The generator (: i + > is shown. Other high frequency generators (
3,) to (3n) are also similar to those in FIG. The high frequency generator (3,) is a self-excited single-stone transistor inverter. That is, a transistor (Tr), an output transformer (T), 1. - and a capacitor (C'').The configuration of such an inverter itself is well known, so the explanation will be omitted.
In the figure, (4) is the current limiting device for the discharge lamp (l,), and (5)
3 is a transformer for heating the filament of the radiant lamp (1,). This transformer (5) is supplied with power from the commercial power source. In addition, (6,) in FIG. This is a switch that controls the flow at the pace of Tr).

The function of this switch will be described later.

(7) is a video signal generator, which in this embodiment generates a black and white television signal; 9) and a video amplifier On.

0υ is a control device, one image of image number 1M from r+iJ video symbol image signal generator (1/60 in this example)
Controls the activation/stopping of the high frequency generators (31) to (3n) 11rI in accordance with the video signal every second period) to control the amount of light emitted from the light emitting lights (lI) to (1n), It displays images on the display panel (2) above.In other words,
Discharge lamp (11) ~ according to the white to black brightness indicated by the video signal
The light output of (In) is controlled, and the C1 dimming steps include, for example, 8 steps, 16 steps, :32 steps, or continuous dimming. Control device al used in this embodiment
l, a synchronization circuit +12 that generates a synchronization 1 word in response to the video amplifier (II), and an address picture code corresponding to the discharge lamps (1,) to (11) in synchronization with the synchronization circuit a; The generated address signal generator (1 turbidity, Ail a+: Video No. 18 from the video signal generator (7) is converted into digital 1
A/D conversion code 5041. Let go! Light (1+)
~(Lyt) The high frequency generator (Lyt) is selected by the address 1g and 100 generator (1a from 131) and is provided corresponding to the address itit-, and the high frequency generator (1liI) is selected according to the output of the A/D converter αa (Lyt). 31) to (3n), a controller a C15,) to (15n) that determines whether to operate or stop
p and the switches (6,) to (60) for controlling the high frequency generators (3I) to (:(u)) according to the numbers from the controls a(15'+) to (15n). be.

Each component of such a control device (II) is well known.

The control device 0υ and the video 1 word generator (
7) is appropriately housed in or attached to the display panel (2), or provided in a separate operation room (not shown).

Next, the operation will be described using a discharge lamp (l,) as a representative example.

In response to the video signal from the video signal generator (7), the address j signal generator (13Kl controller (151)
is selected, and the controller (151) is A, 4) Conversion 5 (1
According to the signal from the controller (151), the switch (6,) outputs a signal that determines whether to activate or stop the high frequency generator (3,) as shown in FIG. 4 (bl). The high frequency generator (3,) is turned on and off to control the base flow of the transistor (Tr) in the high frequency generator (3,).Therefore, the high frequency generator (3,)
It operates only while the switch (6,) is open and energizes the discharge lamp (t+). In other words, when Image No. 18 shows high brightness, the operating time of the high frequency generator (3υ) is lengthened, and when it shows low brightness, the operating time is shortened.

The other lights (1,) to (1n) are also controlled by controllers (15,) to (15n) K: to output light and lit according to the video IR number. Then, one video ends. Then, the next video No. 1g is controlled in the same manner as above to display the video on the display panel (2).

As is clear from the above explanation and FIG. 4(C),
In the discharge lamps (1,) to (In), island frequency heart pressure is applied to the shield from a predetermined phase of high frequency suppression, that is, from the oscillation start phase. Therefore, if the dimming level is the same, there will be 4 lights (
There is no difference in the lamp magnetic current between 1,) and (In),
The light output is to be made uniform.

Furthermore, the light output of the same discharge lamp becomes stable. Note that Fig. 4(a) shows the period of the video signal, and in Fig. 4(C), the output of the high frequency generator continues slightly even after the switch is turned on, which is due to the inverter transformer. This is due to the transient response of ('I'). Since the output due to this transient response is approximately constant, the optical output does not vary due to this transient response.

FIG. 5 shows another embodiment of the display element. In this example, a high frequency generator (3M) and a discharge lamp (
1,) is the same as that shown in FIG. 3, but the high frequency generator (3,) is operated and stopped by controlling input. That is, the switch (61) is provided in series with the input terminal of the high frequency generator ii (31). Further, in this embodiment, the filament of the flash lamp (II) is heated by direct current pressure.

FIG. 6 shows still another embodiment of the display element. In this embodiment, the high frequency generator (201) includes a control signal generator 'ac21J' and a separately excited inverter (2 units) that operates in accordance with the output of the generated signal. The operation of the control signal generator (2υ) is controlled by a video signal. In other words, the switch (6:) is connected to the control signal generator (which is installed in series with the input terminal of 2υ). be.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be modified in various ways. For example, the high frequency generator may be of a two-stone type instead of a single-stone type, or may use a switching element such as a thyristor. Further, the current limiting device of the discharge lamp may be a condenser other than an inductor, and furthermore, a transformer cage inductance in an inverter may be used. However, a current limiting device consisting only of a resistor is not preferable because it increases the loss of ridge force. Furthermore, the control device was
Other configurations such as those shown in Japanese Patent Publication No. 1-20845 and Japanese Patent Publication No. 42-9222 are possible.

As described in detail above, the present invention includes a display element including four emitting lights and a high-frequency generator for energizing the emitting lights, and the activation and deactivation of the high-frequency generator is controlled by a video 1.
Since the emission is performed according to the word, the high frequency signal can be applied to the lamp at a predetermined phase or at the oscillation start phase, and the dispersion of light output among the lamps can be minimized over a large number of emission signals. This makes it possible to prevent flickering of the light output of individual discharge lamps and to display high-quality images.

[Brief explanation of drawings]

FIG. 1 is a 1m diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing the system configuration of the same embodiment, FIG. 3 is a circuit diagram showing the circuit structure of the display element of the same embodiment, and FIG. FIG. 4 is a waveform diagram showing the operation of the same embodiment, and FIGS. 5 and 6 are circuit diagrams showing other circuit configurations of the display element. (1,) ~ (In)...discharge lamp, (2) display panel,
(3+) to (3+t), 12G - high frequency generator, (7)... video signal generator, 00 control device. Patent Applicant Toshiba RIB Co., Ltd. Agent Attorney E1 Ono 1) Yoshi Engraving of the drawing (no changes to the content) Sai 1 Figure 3 Kuchi 4 Agony () - 1 - "heha +, -heha JυN HafυV+sai 5
Figure 1 Year 4 Illustration procedure (Fl) J-E Yu (self-motivated) Showa Season ゛ Month Day 1, Display of the incident 1988 special fr 'Ftn! No. 148566Q2, Name of the invention Large-format video display device 3, Relationship with the person making the amendment 1'1 Patent applicant Toshiba Denzai (375), 1-1-43 Shibaura, Minato-ku, Tokyo Sato Thailand Co., Ltd. Representative Hitoroku Sato 4, Deputy Person 210 Hanging land 72 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Toshiba Electric Materials Corporation Horiyo-cho Drawing 6, contents of amendment (1) The application is corrected and reversed as shown in the attached sheet (engraved, no change in content). (2) The entire specification is corrected as shown in the attached sheet (engraved, no change in content). (3) Drawings amended as shown in the attached sheet (engraving, no change in content).

Claims (3)

[Claims] (1) A display board consisting of a large number of light-emitting display elements arranged, a video one-word generator that generates a video signal, and the amount of light emitted by each of the display elements according to the video signal for each video. and a control device for displaying an image on the display panel; the display element is configured to include a hozan lamp and a high frequency generator for energizing the group 1 lamp, and the high frequency generator 1. A large-sized video display device, characterized in that activation and deactivation are controlled in accordance with the video signal. (2) The high frequency generator is a self-excited inverter, and the supply of the high frequency generator is controlled by human power or a control signal in accordance with the video signal. Shape image display device. (3) The high frequency generator includes a control signal generator and an oil-operated inverter operated by the output of the generator, and controls the entire operation of the control signal generator in accordance with Video No. 11. A large-sized image display device according to claim (1), characterized in that: