JP2773140B2 - Image display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage applying means for a flat panel display in the field of video information equipment.

2. Description of the Related Art In recent years, flat-panel image display devices such as liquid crystal, plasma display (PDP), and electroluminescence (EL) have been developed as image display devices for displaying characters, images, and the like, and some of them have been put to practical use. There is also. On the other hand, we proposed an electron beam type flat panel display using a plurality of linear hot cathodes as one of them. Hereinafter, the above-mentioned flat panel display will be described with reference to the drawings.

2, the back electrode 1, a linear hot cathode 2 as an electron beam source, an electron beam extraction electrode 3, an electron beam control electrode 4, and an electron beam focusing electrode are shown in order from rear to front as shown in FIG. 5 and 6, an electron beam parallel deflection electrode 7 and an electron beam vertical deflection electrode 8 are arranged, and a front glass container 9 as an anode and a rear metal plate
The vacuum is maintained by 10.

The linear hot cathode 2 as an electron beam source is stretched in the horizontal direction so as to generate an electron beam distributed in a ribbon shape in the horizontal direction. (Only four are shown here)
It is stretched. These linear hot cathodes 2 are formed of thin wires obtained by applying an alkaline earth carbonate such as Ba, Sr or Ca to a high melting point metal wire such as a tungsten wire.

The back electrode 1 is located behind the linear hot cathode 2 and guides the electrons emitted from the linear hot cathode 2 forward.
The linear hot cathode 2 is constituted by a single plate in which a conductive film is provided on a metal plate or a glass plate, and a negative voltage is applied to the linear hot cathode 2.

The electron beam extraction electrode 3 extracts electrons from the linear hot cathode 2 in a ribbon shape, and obtains the obtained electron beam 11.
Is formed of a metal plate provided with a through-hole 3a for guiding a part of the substrate to the front glass container 9 as an anode. The through-holes 3a on the metal plate are provided at positions corresponding to the linear hot cathodes 2 at regular intervals along the horizontal direction in the drawing.

The electron beam control electrode 4 is orthogonal to the linear hot cathode 2,
And a plurality of strip-shaped metal pieces 4 ′ divided into a number corresponding to the through holes 3 a provided in the electron beam extraction electrode 3, at positions corresponding to the through holes 3 a provided in the electron beam extraction electrode 3. Is provided with a through hole 4a.

Electron beam focusing electrodes 5 and 6 are electrodes for focusing the electron beam 11 from the linear hot cathode 2 in the horizontal and vertical directions, each of which is composed of one metal plate, and has through holes 5a and 5a for focusing. 6a is provided.

The electron beam horizontal direction electrode 7 is a pair of comb-shaped electrodes 7.
It consists of a and b. The position of the through hole 7a of the electron beam horizontal deflection electrode 7 corresponds to the through hole 3a provided in the electron beam extraction electrode 3, and corresponds to the position between the comb electrodes 7a and 7b, respectively.

The electron beam vertical electrode 8 is a pair of comb-shaped electrodes 8.
It consists of a and b. The position of the through-hole 8a of the electron beam vertical deflection electrode 8 corresponds to the vertical interval of the through-hole 3a provided in the electron beam extraction electrode 3 corresponding to the linear hot cathode 2 in the drawing. They correspond to the positions sandwiched between 8a and 8b, respectively.

The front glass container 9 includes three types of red, green, and blue phosphor stripe layers provided on the inner surface of the glass along the vertical direction of the drawing, a black stripe layer provided therebetween, and a metal back layer provided on the front surface thereof. Provided and configured in a bowl shape.

The back metal plate 10 forms a container for maintaining a high vacuum with the front glass container 9. A 42-6 alloy (Ni 42%, Cr 6%, F
e52%).

In order to drive such an image display device, a circuit as shown in FIG. 3 is required. Here, 22 is a power supply circuit for applying a predetermined operating voltage to each electrode of the display element (back electrode 1, electron beam extraction electrode 3, electron beam focusing electrodes 5 and 6 in FIG. 2), and 23 is a signal input terminal , 24 are a synchronous separation circuit, 40 is a vertical deflection circuit, which is composed of a vertical deflection counter 25, a memory 27 for storing vertical deflection signals, and a digital-analog converter (DA converter) 39, and has eight stages of vertical deflection. Get the signal. 26 is a line cathode drive circuit, 41 is a horizontal deflection circuit, which is composed of a horizontal deflection counter (11 bits) 28, a memory 29 storing a horizontal deflection signal, and a DA converter 38, for 1H period Then, a horizontal deflection signal of a six-step wave is obtained. 30 is a color demodulation circuit, 31a to 31n are 120 sample and hold circuit groups, 32a to 32n are memory groups, 33 is a reference clock oscillator, 34 is a sampling pulse generation circuit, 35a
35n is a switching circuit, and 37a to 37n are 120 sets of pulse width modulation (PWM) circuits, the outputs of which are separately applied to the control electrode 4 of the display device as control signals for modulating the electron beam. 36 is a switching pulse generation circuit. (For details, refer to JP-A-57-135590.) Problems to be Solved by the Invention In such an image display device, as shown in FIG. , A blue phosphor layer 13, a black stripe layer 14 provided therebetween, and a metal back layer 15 provided on the front surface thereof need to be applied with a high voltage to cause the phosphor to emit light. For this purpose, conventionally, a hole is formed in the side surface of the front glass container 9 and a metal wire 47 made of a 42-6 alloy is sintered by the crystalline frit glass 18. In order to connect the metal wire 47 to the phosphor stripe layer 13 or the like, a metal plate 49 made of a 42-6 alloy is provided in the middle with a crystalline frit glass.
The metal plate 49 is fixed to the inner surface of the front glass container 9 by 51, and an Ag paste 50 is used for connection between the metal plate 49 and the phosphor stripe layer 43 and the like, and connection between the metal wire 47 and the metal plate 49 is performed. Used a metal wire 48 such as Ni. In such a configuration, a voltage difference of about 10 KV is applied between the phosphor stripe layer 13 and the like provided on the inner surface of the front glass container 9 and the electron beam vertical deflection electrode 8 only by a little over ten mm. Due to the above connection configuration, there is a problem that electric field distortion occurs and uniform image display cannot be performed.

Further, in order to supply a high voltage from a flyback transformer (FBT), connection between the metal wire 47 and a high-voltage lead wire (not shown) requires soldering or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an image display device that can make an electric field uniform and can easily perform a connection operation.

Means for Solving the Problems In view of such a point, the present invention uses an anode button on an inclined portion of a front glass container of the image display device, and uses an anode button provided on an inner surface of a front glass container 9 of the image display device. , Green,
In order to equalize the voltage applied to the three types of blue phosphor stripe layers, the black stripe layer provided between them, and the metal back layer provided on the front surface thereof, the connection between the anode button and the phosphor stripe layer was made as described above. The same material or the same material as the black stripe layer is used, and is applied to the inclined portion of the front glass container over the circumference.

Effect In the conventional image display device, as described above, since the metal wires and the metal plate are connected on the inner surface of the front glass container, the high voltage applied to the phosphor stripe layer is distorted. A uniform image cannot be displayed near the line. This phenomenon becomes more conspicuous as the image display surface becomes larger with respect to the front glass container. Therefore, the present invention eliminates the protrusion of the metal wire provided on the front glass container to the inner surface of the front glass container, applies the inner surface of the front glass container with a uniform material, and makes the electric field uniform, so that the partial Image distortion can be eliminated.

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the image display device of the present invention. In the figure, reference numeral 9 denotes a front glass container, in which red, green, and blue phosphor stripe layers 13 on the inner surface, a black matte layer 14 therebetween, and a metal back layer 15 on the front surface thereof.
Is provided. Reference numeral 17 denotes an anode button. A hole is formed in the side surface of the front glass container 9 in advance, and the button is bonded to the front glass container 9 with a crystalline frit glass 18. The red, green, and blue phosphor stripe layers 13, the black stripe layer 14 therebetween, the metal back layer 15 provided on the front surface thereof, and the connecting member 16 between the anode button 17 were used for the black stripe layer 14. The same material as that described above or a duck material containing carbon as a main component was used. Although the location of application of the connecting member 16 varies depending on the structure of the electrode of the image display device, in the present embodiment, it is provided up to a position approximately half the height of the inner surface of the front glass container 9. By arranging the conductive connecting member 16 on the inner surface of the front glass container 9 around the circumference in this manner, the electric field can be made uniform and the distortion of the image can be eliminated. Further, since the connection between the anode button 17 and the connection member 16 is in contact and there is no need to re-solder, there is an advantage that the connection operation can be easily performed.

As described above, according to the present invention, according to the present invention, the anode button is installed on the inclined portion of the front glass container, and the inner surface of the inclined portion is circumferentially connected with the connecting member for connecting the anode button and the phosphor stripe layer. By coating, the electric field is made uniform to eliminate image distortion, and the connection operation itself does not require soldering, and thus has an advantage that it can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an image display device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the configuration of the image display device to which the present invention is applied, and FIG. FIG. 4 is a block diagram showing a driving circuit, and FIG. 4 is a cross-sectional view showing a configuration of a main part of a conventional image display device. 9 front glass container, 10 back metal plate, 13 phosphor stripe layer, 14 black stripe layer, 15 back metal layer, 16 connecting member (conductive material), 17
Anode button.

Continuation of front page (56) References JP-A-56-120063 (JP, A) JP-A-59-46741 (JP, A) JP-A-63-301451 (JP, A) JP-A-54-21254 (JP) , A) Fully open 1988-612343 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 29/90 H01J 29/92 H01J 31/12

Claims (1)

(57) [Claims] A plurality of linear hot cathodes; an electron beam extracting means for extracting electrons from the linear hot cathode; an electron beam controlling means for controlling a passing amount of the electron beam; Electron beam deflecting means for changing the vertical and horizontal directions, a surface glass formed on a flat surface portion of an inner surface thereof with a phosphor emitting light by collision of an electron beam, and a surface container for forming a vacuum container with the surface glass container. In the image display device including the back metal plate, the flat portion on the upper surface of the anode button in the shape of a truncated cone is inclined on the inclined portion of the front glass container so that the flat portion is flush with the inclined portion on the inner surface of the front glass container. Affixed to the front glass container with frit glass, and a connecting member having electrical conductivity, including a flat portion on the upper surface of the phosphor and the anode button, is provided around the inner surface of the glass container. By applying an image display device being characterized in that electrically connecting the anode button and the phosphor.