JP2897481B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying a color television image used in a viewfinder or the like of a television camera.

[0002]

2. Description of the Related Art Conventional types of display devices include:
There are color liquid crystal displays and beam index type color cathode ray tubes. Of these, color liquid crystals are attracting great expectations as next-generation displays.

However, a color liquid crystal display device is
It is difficult to miniaturize pixels, and even the finest existing
The size of the pixel is several tens of μm square. For this reason, a diagonal of 20 mm is used for a viewfinder of a television camera.
When a small-sized display device having a small size is constructed, the number of pixels in the horizontal direction of the screen is 300 to 400 pixels, and the number of pixels in the vertical direction is about 2 pixels.
The limit is 50 pixels. The number of pixels in the horizontal direction is
Since the total value of the three colors of red, green, and blue is one-third of the number of pixels per color, only a display device that is significantly lower than the resolution of the imaging device of the television camera can be obtained.

In a color liquid crystal device, the resolution in the vertical direction is one of about 500 effective scanning lines of the NTSC system.
Normally, only half of the 250 pixels are provided, which is not sufficient for the purpose of focusing the television camera.

[0005] Another problem of the color liquid crystal display device is that the production yield is poor. this is,
In order to obtain a good contrast ratio, at least one thin film transistor is provided for one pixel.
Even so, the overall failure rate of the 100,000-pixel color liquid crystal display device is 30%, which is a factor preventing cost reduction. Further, in a normal cathode ray tube, the area of a pixel, that is, a phosphor, is about 20 times that of a color liquid crystal display device, which is an even greater obstacle for use in a display device requiring miniaturization and high resolution. .

[0006]

SUMMARY OF THE INVENTION The present applicant has previously disclosed in Japanese Patent Application No. 2-135703 a line-emitting display device capable of achieving miniaturization and high resolution and an optical vertical deflection means. Although a display device has been applied for a patent, in the display device according to the prior art, there is a physical distance between the three primary color illuminants, so that a vertical color shift occurs in the image after vertical deflection, and a cathode ray is generated. It has been found that there is a problem that flicker occurs on the display screen due to interference between the generated heater power supply frequency of the cathode and the synchronizing signal of the image signal, and that the color tone and the color temperature cannot be adjusted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to improve the image quality by eliminating color misregistration and flicker of an image and to adjust the color tone and white temperature. An object is to obtain a display device capable of obtaining high resolution.

[0008]

According to the first aspect of the present invention, there is provided a display apparatus comprising: a light emitter of three colors G, R and B arranged in parallel to a section of a horizontal scanning line; Three grids provided to face the light-emitting body, a cathode for emitting electrons toward these grids,
A line emission type color cathode ray tube having an anode which is provided in contact with the light emitters of the three colors R and B and which is composed of a large number of electrode pieces divided for each pixel and includes a light emitter of the three colors G, R and B. Causes interference with the horizontal and vertical sync signals of the image signal.
Heater current that does not contain
Power supply means for energizing; image signal amplifying means for applying G, R, and B image signals to each grid to control the amount of electron beams passing through each grid; and horizontal signal in synchronization with a horizontal synchronization signal of the image signals means for applying a sequential direct current to each electrode pieces of the upper Symbol anode so as to scan in the direction, the G, R,
G of one scanning line emitted from the B 3-color light emitters, B, R
Image light combining means for superimposing three colors of image light on a line, and converging the vertical width of the superimposed color image
Image light focusing means, in which the color image light of the focused one horizontal scanning line with a vertical deflecting means Ru is deflected in the vertical direction in synchronization with the vertical synchronizing signal of the image signal.

[0009] A display device according to a second aspect of the present invention is a display device comprising:
G, R, and B colors arranged in parallel to the section of the flat scanning line
A light-emitting body and a light-emitting body of three colors of G, R, and B are provided to face each other.
Three grids and towards these grids
Cathode that emits electrons and emission of the above three colors G, R, and B
A set of G, R, and B color light emitters provided in contact with the body
An anode composed of a large number of electrode pieces divided for each pixel
Line emission color cathode ray tube having a
G, R, B image signals are applied to the lid to
Image signal amplification means for controlling the amount of electron beam passing through the
Bars for arbitrarily adjusting the DC potential of each grid above
Bias potential adjusting means and a horizontal synchronizing signal of the image signal.
Each electrode of the anode is scanned so as to scan horizontally in synchronization.
Means for sequentially applying a DC high voltage to the pole pieces, G, R, B
G, R, B for one scanning line emitted from the three color luminous bodies
Image light combining means for superimposing three colors of image light on a line;
The vertical width of the superimposed color image of
Image light focusing means, the color of one focused horizontal scanning line
-Synchronize the image light with the vertical synchronizing signal of
A vertical deflection means for deflecting in the direction is provided.

[0010] The display device according to a third aspect of the present invention is a display device comprising:
G, R, G, R,
A line emission type color cathode ray tube having a B3 color light emitter,
Reflects any one of G, R, and B color lights
Three reflecting surfaces, each reflecting surface being set at an interval b.
One stroke emitted from the G, R, B three color luminous body
G, R, and B color image light are overlapped on a line
Image photosynthesis means, vertical of this superimposed color image
Image light focusing means for focusing the width in the direction,
The vertical synchronization of the image signal with the color image light for the horizontal scanning lines
Vertical deflection means for vertically deflecting in synchronization with a signal.
With respect to the emission surface of the line emission type color cathode ray tube
And a reflecting surface of the image light combining means is provided at an angle of 45 degrees.
When the distance a between the light emitters of the three colors G, R, and B is
The relationship of the distance b between the reflecting surfaces of the dichroic mirror is represented by b =
a / (2 ^1/2 ) .

[0011]

[Action] display apparatus according to the first invention, the image signal
Frequency components that interfere with the horizontal and vertical sync signals of the signal
Power supply means that outputs heater current that does not include
Power is supplied to the cathode of the
G, R, and B colors emitted from a light-emitting color cathode ray tube
Image light for one scanning line on one line using image light combining means
Vertically deflected by vertical deflection means
Is displayed on the display screen.
Interference due to frequency components contained in the heater current
There is no flicker .

[0012] The display device according to the second invention is a display device.
Line emission type color cathode ray tube with ias potential adjusting means
The DC potential of each grid can be adjusted arbitrarily.
, So you can freely adjust the mixing ratio of G, R and B colors
Can easily adjust the hue and color temperature of the displayed image
Can be .

According to the display device of the third invention,
For example, it is arranged in parallel with the interval a in the section of the horizontal scanning line segment.
Line emission type color with G, R, B light emitters
At an angle of 45 degrees with respect to the light emitting surface of the cathode ray tube, G, R,
Three that reflect any one of the B color lights
Reflective surfaces are arranged at intervals b,
One scanning line emitted from the G, R, and B light emitters
Image light that superimposes the three colors of G, R, and B image light on a line
A synthesizing means is provided, and the distance a between the luminous bodies of the three colors G, R, and B is
The relationship of the distance b between the reflecting surfaces of the dichroic mirror is represented by b =
a / (2 ^2/1 ), one of the three colors G, R, and B
Scanning image light can be superimposed on one line,
Even if it is vertically deflected by vertical deflection means, the resulting image
No color shift occurs .

[0014]

[Embodiment 1] FIG. 1 is a diagram showing a configuration of an embodiment of the present invention, and FIG. 2 is a line emission type color cathode ray tube (hereinafter, referred to as a line cathode ray tube).
FIG. 2 is a perspective view of a “cathode ray tube”. In the figure, 1
Is a cathode ray tube, a cathode 2 stretched in the horizontal direction, three grids 3 (3G, 3R, 3B) formed with a large number of through holes in the horizontal direction and arranged in the vertical direction. Are respectively provided at positions where the electron beams passing through the grids 3G, 3R, and 3B strike, and extend in the horizontal direction.
Further, a light emitting body 4 (4G, 4R, 4B) formed in the vertical direction in the order of G, R, B, and these light emitting bodies 4
An anode 5 composed of a large number of electrode pieces 5-1 to 5-N arranged in a horizontal direction so as to be in contact with the back surfaces of G, 4R and 4B and having a narrow width corresponding to one pixel. It is composed of

A heater power supply is supplied to the cathode 2 from a heater power supply 6, and G, R, and B image signals are applied to the grid 3 via image signal amplifiers 7 (7G, 7R, 7B). Bias potential adjuster 8 (8G, 8
R, 8B), the bias potential of each grid 3 is set to a desired value. Further, the electrode pieces 5-1 to 5-1 of the anode 5
The 5-N, from the DC high-voltage power supply 9 so as through a switch 10 to scan in synchronism with the horizontal synchronizing signal, sequentially dc voltage is applied.

[0016] Therefore, electrons emitted from the cathode 2 is a electron beam electron amount is adjusted light emitter 4 to emit light since the bombardment through the grid 3, dc applied to the anode 5 color image light one scanning line is emitted with the scanning switching of voltage. Reference numeral 11 denotes a color image display device for one scanning line, and the cathode ray tube 1 and its driving devices 6 to 1
0.

Reference numeral 12 denotes a dichroic mirror, which is composed of three types of dichroic mirrors 12G, 12R, and 12B that reflect only G, R, and B color lights, respectively, and emits one of the three colors G, R, and B emitted from the cathode ray tube 1. The image light for the scanning line is superimposed on one line. Reference numeral 14 denotes a converging lens composed of two cylindrical convex lenses, and converges so that the vertical width of the color image light superimposed on one line is reduced. 15 Daikuroi Tsu Kumira 12 and the focusing lens 1
4 is a superposition / focusing optical system constituted by 4.

Next, one of the dichroic mirrors 12
The superimposing operation of the three colors of image light for the horizontal scanning will be described with reference to FIG. The image lights emitted from the light emitters 4G, 4R, and 4B are reflected by dichroic mirrors 12G and 12G, respectively.
R, 12B reflect. Here, when the installation angle θ of the dichroic mirror 12 is set to 45 degrees which is suitable for the reflection of a general dichroic mirror,
If the distance a between G, 4R, and 4B and the distance b between the dichroic mirrors 12G, 12R, and 12B have a relationship of b = a / ^21/2 , the image light emitted from the light emitters 4G, 4R, and 4B. Reflected light overlap. A mirror 13 is provided to change the direction of the reflected light.

As a result, the light emitted from the luminous bodies 4G, 4R, 4B arranged at the physical distance a appears to be emitted from the same place, so that the color shift is eliminated. Although the optical path lengths from the light emitters are different from each other, there is no problem if the distance a between the light emitters is negligible with respect to the total optical path length.

Reference numeral 16 denotes an optical vertical deflecting means which comprises a polygon prism 17 and a rotation driving device 18 for sequentially deflecting the condensed color image light for one scanning line in the vertical direction in synchronization with a vertical synchronizing signal. .

Assuming that the length of one side of the polygon prism 17 is d, the inclination with respect to the incident light is θ, the refraction angle is δ, and the refractive index of the polygon prism 17 is n, the vertical displacement y of the light emitted from the polygon prism 17 is Y = dsin (θ−δ) / cosδ sinδ = sinθ / n, and the vertical displacement y is such that the ratio of the horizontal width of the color image for one horizontal scanning line to the predetermined aspect ratio of the television screen. The parameters of the polygon prism 17 are determined. Reference numeral 19 denotes an eyepiece for enlarging a small display screen to an appropriate size.

The light path in FIG. 1 indicates a paraxial ray. In the case of only the paraxial rays, it is inconvenient that only the center of the vertical scanning line can be visually recognized.
However, actually, the color image light for one horizontal scanning line has a certain degree of spread, so that no problem occurs within the vertical scanning range of several tens of mm required in this embodiment.

Next, the operation of the heater power supply 6 will be described. In the display device of this embodiment, the cathode 2 for emitting electrons from the heater power source 6, when passing a heater current of the AC, the frequency is, for example, when the 50H _Z, is a general television system in Japan NT
The frequency of the vertical synchronizing signal SC system video signal 60H _Z
And causing the interference, flicker of 10H _Z occurs in the display screen.

[0024] In this embodiment, the frequency of the heater power supply 6 of the cathode 2, does not contain a frequency component caused interference with the frequency of the vertical television signal (60H _Z) and a horizontal synchronizing signal (15.75KH _Z), Alternatively, in the frequency of flicker is invisibly (e.g. 100KH _Z, etc.).

Next, the operation of the bias potential adjusting means 8 will be described. For a color image, it is necessary to set the mixing ratio of the three colors G, R, and B appropriately, and the color tone and the color temperature of white change depending on the ratio. Light-emitting body 4G, 4
The luminous state of R, 4B changes depending on the potential of each grid 4G, 4R, 4B. Even if the same potential is applied to each grid, there is a difference in luminous efficiency of each luminous body 4G, 4R, 4B. Therefore, each color does not emit light with the same brightness.

In this embodiment, the DC bias of each grid 3 is adjusted by the bias potential adjusters 8G, 8R and 8B, respectively, so that the mixing ratio of the three colors RGB can be changed to a desired ratio. The color tone and color temperature of the screen can be freely adjusted.

Embodiment 2 FIG. FIG. 4 shows an optical vertical deflection means 1.
6 is an example in which a movable mirror (galvano mirror) 20 is used, and the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG. FIG. 5 shows an optical vertical deflection means 1.
6 is an example in which a hexagonal movable mirror (polygon mirror) 21 is used, and the same effect as in the first embodiment can be obtained.

Embodiment 4 FIG. FIG. 6 shows a dichroic mirror 1 for superimposing image light corresponding to one scanning line of three colors of G, R and B.
2 is a view showing another embodiment, in which two dichroic mirrors 12B and 12R are respectively arranged and arranged as shown in the figure. According to this embodiment, the luminous body 4 may be a monochromatic (white) luminous body.

Embodiment 5 FIG. The display device according to the present invention can be diverted to a projector, and FIG. 7 is a diagram showing the configuration of one embodiment. That is, when the screen 22 is placed at a position where a real image is separated from the eyepiece lens 5 by a distance equal to or longer than the focal length f, an image is obtained on the screen 22. 4 and 5, an image can be obtained on the screen.

Embodiment 6 FIG. In the above embodiment, the condenser lens 14 is constituted by two cylindrical convex lenses. However, a slit may be provided at the exit of the convex lens to enhance the focusing effect.

Embodiment 7 FIG. Also, the luminous bodies 4G, 4R, 4B
Instead, a single white light-emitting body may be used, and three primary colors may be obtained by an optical filter.

[0033]

As described above, the display according to the first invention is described.
According to the ray device , the cathode of the line emission type cathode ray tube is
Synchronizes the waveform of the current flowing through the heater with the television signal
Set to a waveform that does not contain frequency components that cause interference with the signal.
Therefore, there is an effect that flicker on the display screen due to interference is eliminated .

According to the display device of the second invention,
For example, G, R, B grid of a line emission type color cathode ray tube
Potential adjustment for individually adjusting the DC bias potential of
Means to freely adjust the color tone and color temperature of the display screen
There is an effect that can be adjusted .

According to the display device of the third aspect,
For example, it is arranged in parallel with the interval a in the section of the horizontal scanning line segment.
Line emission type color with G, R, B light emitters
At an angle of 45 degrees with respect to the light emitting surface of the cathode ray tube, G, R,
Three that reflect any one of the B color lights
Reflective surfaces are arranged at intervals b,
One scanning line emitted from the G, R, and B light emitters
Image light that superimposes the three colors of G, R, and B image light on a line
A synthesizing means is provided, and the distance a between the luminous bodies of the three colors G, R, and B is
The relationship of the distance b between the reflecting surfaces of the dichroic mirror is represented by b =
a / (2 ^1/2 ) for one scanning line of G, R and B colors
The image light is superimposed on a line.
The image light of one horizontal scanning line of R and B colors is as if
It looks like it was fired from the line, so G,
The color shift due to the physical distance between the R and B light emitters is eliminated,
The effect is that a high-resolution display device can be obtained.
You .

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a line emission type color cathode ray tube of the first embodiment.

FIG. 3 is a diagram illustrating a configuration of a dichroic mirror according to the first embodiment.

FIG. 4 is a diagram showing a configuration of a second embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a third embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a projector to which the present invention is applied.

[Explanation of symbols]

1 line emission type color cathode ray tube 2 cathode 3 grid 4 emitters 5 anode 6 heater power supply 7 video signal amplifier 8 bias potential adjuster 9 color image display device of the dc power supply 10 switches 11 one scanning line 12 a dichroic mirror 14 focusing Lens 15 Superposition / focusing optical system 16 Optical vertical deflection means 17 Polygon prism 18 Rotation driving device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 9/16 G09G 1/04 G09G 1/28 H04N 5/225

Claims (3)

(57) [Claims] 1. G, R, and B light emitters arranged in parallel to a section of a horizontal scanning line; three grids provided to face the G, R, and B light emitters; A cathode for emitting electrons toward these grids; and G, R, and B light emitters provided in contact with the G, R, and B light emitters.
A line emission type color cathode ray tube having an anode composed of a large number of electrode pieces divided for each pixel having a set of light emitters of B3 color, a frequency causing interference with horizontal and vertical synchronization signals of image signals
Apply a heater current not containing several components to the cathode
Power supply means, G to the respective grids, R, the image signal amplifying means for controlling the amount of electron beams by applying an image signal of B through the respective grid, the horizontal direction in synchronization with the horizontal synchronizing signal of the image signal scanning
Means for applying a sequential direct current to each electrode pieces of the upper Symbol anode to said G, R, B 3-color one scanning line of the G emitted from the light emitting member, R, B 3-color image light Image light superimposed on the line
Synthesizing means, the image light focusing means for focusing the vertical width of the superposed color image, the color image light of the focused one horizontal scanning line in the vertical direction in synchronization with the vertical synchronizing signal of the image signal Ru was deflected
Display apparatus having a vertical deflection means. 2. The apparatus according to claim 1, wherein said plurality of scanning lines are arranged in parallel with each other.
G, R, and B three-color light-emitting bodies, and three light-emitting bodies provided to face the G, R, and B three-color light-emitting bodies
Grids and cathodes emitting electrons towards these grids
And G, R, and B provided in contact with the light emitters of the three colors G, R, and B.
A large number divided for each pixel with a set of luminous bodies of B3 color
Line emission type having an anode composed of a plurality of electrode pieces
The color cathode ray tube applies G, R, and B image signals to each of the grids, and
Image signal enhancement to control the amount of electron beam passing through each grid
Width means , and a bar for arbitrarily adjusting the DC potential of each of the grids.
A bias potential control means, scanning in the horizontal direction in synchronism with the horizontal synchronizing signal of the image signal
DC high voltage is sequentially applied to each electrode piece of the anode so that
Means for applying , one scanning line emitted from the luminous body of three colors of G, R and B
Image in which image light of three colors G, R and B are superimposed on a line
Photosynthesis means to focus the vertical width of this superimposed color image
Image light converging means , which converges the converged color image light for one horizontal scanning line
Deflection in the vertical direction in synchronization with the vertical synchronization signal of the image signal
A display device provided with vertical deflection means . 3. Arranged in parallel with a section of a horizontal scanning line at an interval a.
Line emission type with G, R, B light emitters placed
Color cathode ray tube , reflects any one of G, R, B color light
Three reflecting surfaces, each reflecting surface being set at an interval b.
One stroke emitted from the G, R, B three color luminous body
G, R, and B color image light are overlapped on a line
Image light combining means for converging the vertical width of this superimposed color image
Image light converging means , which converges the converged color image light for one horizontal scanning line
Deflection in the vertical direction in synchronization with the vertical synchronization signal of the image signal
A vertical deflecting means, with respect to the light emitting surface of the line emission type color cathode ray tube.
The reflection surface of the image light combining means was provided at an angle of 5 degrees.
When the distance a between the G, R, and B light emitters is equal to the
B = a /
( ^21/2 ) A display device characterized by the above-mentioned.