JPH04355493A - Thin type large screen display device - Google Patents

Abstract

PURPOSE:To uniformly generate an electron beam from each linear thermal cathode, cover the display of a narrow scanning range, allow a highly illuminous display, fix each linear thermal cathode in the fixing point of a support wall, and prevent the turbulence of a displayed picture plane by a vibration given from the outside. CONSTITUTION:Each linear thermal cathode 11 is vertically divided into odd stages and even stages and further arranged in a staggered form and set with the respective horizontal scanning ranges being horizontally shifted by halves, and a support wall 12 for supporting a transparent front plate to a rear plate is provided on the boundary of the horizontal scanning ranges. Each linear thermal cathode is fixed to the rear plate in the fixing point P of the support wall 12, and a current is supplied separately every vertically divided stage of each linear thermal cathode 11. Thus, electron beams can be uniformly generated, the cover of the display of a narrow scanning range is sufficient, and a highly illuminous display can be performed even in a large screen.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin large screen display device using a plurality of linear hot cathodes as an electron beam source.

0002

2. Description of the Related Art An example of this type of thin large screen display device is one described in Japanese Patent Laid-Open No. 1-117251. The display device described in this document is composed of a transparent front plate, a rear plate, and a side plate, and has an envelope whose inside is evacuated. A phosphor and a transparent anode are provided on the inner surface of the transparent front plate. A large number of vertical address electrodes are provided on the inner surface of the rear plate, extending horizontally and vertically arranged at slight intervals. Furthermore, on the inside of the rear plate, at a position slightly away from the vertical address electrode,
A plurality of linear thermal cathodes are arranged extending vertically and at predetermined intervals in the horizontal direction, a modulation electrode is provided directly below each linear thermal cathode, and horizontal focusing and deflecting electrodes are arranged on both sides of the modulating electrode. A support wall for supporting the front plate relative to the rear plate is provided between the plurality of linear hot cathodes.

This display device divides the horizontal scanning range of the electron beam into multiple parts by providing a plurality of linear hot cathodes, and narrows the deflection range of the electron beam generated from each linear hot cathode. Even with a large screen, it is possible to make it thinner. Additionally, the strength of the envelope is increased by providing a support wall.

0004

[Problem to be solved by the invention] However, in the above display device, the linear hot cathode is not divided in the vertical direction, so when the screen is enlarged, the length of the linear hot cathode becomes long, and the linear hot cathode becomes long. A potential difference develops across the hot cathode. Therefore, there is a problem that the amount of electrons generated varies depending on the location. In order to solve this problem, the above-mentioned document describes measures such as providing a potential difference to the vertical address electrodes and changing the width of the modulation electrodes, but these methods make the control or configuration complicated. Furthermore, when the linear hot cathode becomes long, the linear hot cathode vibrates due to external vibrations, which causes disturbances in the display screen.

[0005] This invention aims to fundamentally solve the above-mentioned problems.

[0006]

[Means for Solving the Problems] In the thin large screen display device according to the present invention, the inside of the envelope is vertically divided into a plurality of stages, and the horizontal scanning range of the electron beam generated from each linear hot cathode is , vertically divided odd-numbered stages and even-numbered stages are set horizontally shifted by half of the horizontal scanning range of the electron beam generated from each of the linear thermal cathodes, and a rear plate is placed at the boundary of the horizontal scanning range. A support wall is provided for supporting the transparent front plate.

[0007] The linear hot cathode is fixed to the rear plate at a position where the support wall is provided.

Current is supplied to the linear hot cathode separately for each vertically divided stage.

[0009]

[Operation] The inside of the above-mentioned envelope is divided vertically into multiple stages,
The horizontal scanning range of the electron beam generated from each linear thermal cathode is divided into vertically divided odd-numbered stages and even-numbered stages, each half of the horizontal scanning range of the electron beam generated from each linear thermal cathode. Because they are staggered, each part of the linear hot cathode that generates the electron beam for display is arranged in a staggered manner. Then, the horizontal scanning ranges are arranged in a checkerboard pattern. In each scanning range divided in the horizontal direction, scanning is performed simultaneously for each horizontal scanning line. This horizontal scanning is controlled by horizontal focusing and deflecting electrodes. Further, vertical scanning is controlled by vertical address electrodes. The amount of electron beam depending on the image data to be displayed is controlled by the modulation electrode.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway perspective view of a thin large screen display device, and FIG. 2 is an enlarged sectional view of a support wall.

FIG. 3 shows the arrangement and scanning range of the linear hot cathode. FIG. 4 is a wiring diagram showing a circuit for supplying current to a linear hot cathode.

Referring to FIG. 1, the envelope of the thin large screen display device includes a transparent front plate 20 made of glass or the like, arranged parallel to the front plate 20 at an appropriate distance, and made of an insulating material. rear plate 10, and the front thereof,
It consists of a side plate (not shown) that closes the periphery between the rear plates 20 and 10, and the inside thereof is exhausted.

A transparent conductive film 21 serving as an anode and a phosphor 22 are provided on the inner surface of the front plate 20. The front plate 20 becomes a display screen.

On the inner surface of the rear plate 10, a large number of elongated vertical address electrodes 13 extending in the horizontal direction are arranged and fixed in the vertical direction with slight intervals from each other. The vertical address electrode 13 controls vertical scanning of the electron beam.

Furthermore, a plurality of linear thermal cathodes 11 extending in the vertical direction are arranged in front of the rear plate 10. A plurality of linear hot cathodes 11 are provided at appropriate intervals in the horizontal direction. The linear hot cathode 11 generates an electron beam when a current flows therethrough.

A modulation electrode 14 extending vertically is provided behind the linear hot cathode 11. This modulation electrode 1
As can be seen from FIG. 2, 4 is connected to the vertical address electrode 1 via an insulator 16 (this insulator 16 and an insulator 17, which will be described later, are omitted in FIG. 1 for the purpose of simplifying the illustration).
It is fixed on 3. The linear hot cathode 11 is separated from the modulation electrode 14 by a certain distance. The modulation electrode 14 is for controlling the amount of electron beam emitted from the linear hot cathode 11 according to the image data to be displayed.

Further, horizontal focusing/deflecting electrodes 15 extending vertically are arranged on both sides of the linear hot cathode 11. This horizontal focusing and deflecting electrode 15 is fixed on the vertical address electrode 13 via an insulator 17. This electrode 1
5 focuses an electron beam emitted from a linear hot cathode 11 onto a phosphor 22 on a front plate 20 and horizontally scans the electron beam. This horizontal focusing/deflecting electrode 15 is shared by adjacent linear hot cathodes 11 . Of course, a pair of horizontal focusing/deflecting electrodes 15 may be provided for each linear hot cathode 11.

Support walls 12 made of a large number of insulators are erected on the rear plate 10 in a staggered arrangement. As shown in an enlarged view in FIG.
a is formed. The support wall 12 is a linear hot cathode 11
It is provided along this cathode 11 at the position of , and the recess 12
The linear hot cathode 11 and the modulation electrode 14 pass through the inside of the support wall 12 so as not to touch the support wall 12. The thickness of the support wall 12 becomes thinner toward the front, and its tip is pointed. The support wall 12 is fixed on the rear plate 10 at its lower end, and its tip is pressed against the front plate 20.

Referring to FIG. 3, as described above, the rear plate 10
On the top, vertically extending linear hot cathodes 11 are arranged horizontally at predetermined intervals. Support walls 12 are provided on the linear hot cathode 11 in a staggered arrangement. Depending on the placement position of the support wall 12, the top of the rear plate 10 is vertically divided into a plurality of stages. Although there is no member representing the boundary between each stage, each stage can be clearly divided from the viewpoint of electron beam scanning. In each stage, the area between two adjacent support walls 12 constitutes one horizontal scanning range (this is referred to as one horizontal block).

A linear thermal cathode 11 passes through the horizontal center of each horizontal block, and the electron beam emitted from the thickly illustrated portion of the linear thermal cathode 11 is directed horizontally within the range of each horizontal block. is scanned. therefore,
The thickly illustrated portions of the linear hot cathodes 11 are also arranged in a staggered manner. One horizontal block is shifted horizontally by half of one horizontal block between odd numbered rows (1st row, 3rd row, etc.) and even numbered rows (2nd row, 4th row, etc.), and they are arranged in a checkerboard pattern. This means that

A linear hot cathode 11 is fixed on the rear plate 10 within a recess 12 of each support wall 12. The fixed portions are indicated by x marks in FIG. And the linear hot cathode 11
A current is supplied separately to each part between two adjacent cross marks. As shown in FIG. 4, at least two current sources 1A and 1B are provided, and these current sources 1A, 1B are provided.
A current is given to each of the above sections by B. More current sources can be provided if necessary.

As described above, the linear hot cathode 11 is arranged at every other stage divided in the vertical direction of one horizontal block.
Since it is fixed at the part marked, it is resistant to vibrations applied from the outside and prevents disturbances on the display screen due to vibrations. In addition, the linear hot cathode 11 has a horizontal
The electric current is supplied to each vertically divided stage of the block, so the potential difference generated is small and the linear hot cathode 11
An electron beam is generated almost uniformly along the length of the

In FIG. 3, the generation of electron beams is smaller in the portions on both sides of the fixed point (point marked with an x) of the linear hot cathode 11 (portions other than the thickly illustrated portions) compared to other portions. This part is not used for image display, so there is no problem at all. The horizontal direction of the display screen is scanned by dividing it into a plurality of horizontal blocks, and the horizontal scanning period of each horizontal block is 1H (horizontal scanning period of the entire display screen), so the horizontal scanning speed can be slow; Since the fluorescent surface 22 is irradiated with a large amount of electron beams, high brightness can be obtained.

FIGS. 5 and 6 show details of the fixed part of the linear hot cathode 11. On the insulating rear plate 10, there are fixed points P (× shown in FIGS. 3 and 4) of the linear hot cathode 11.
As shown in FIG. 4, a conductive pattern 32 is formed to connect the current sources 1A, 1B, etc.
covered by 1. The conductor pattern 32 is a fixed point P
The insulating film 31 is formed to have a somewhat large area, and the insulating film 31 is not provided in this part and is exposed.

A vertical address electrode 13 is provided on the insulating film 31, and a modulation electrode 1 is further provided on the vertical address electrode 13 via an insulator 16.
4 is placed. In the vicinity of the fixed point P, the vertical address electrode 13 is formed to be slightly curved so as to avoid the exposed portion of the conductive pattern 32. Similarly, the modulation electrode 14 is also curved to avoid contact with the conductive pattern 32.

A spacer 33 made of a heat-resistant insulator is provided on both sides of the fixed point P on the modulation electrode 14 and the vertical address electrode 13, and the linear thermal cathode 11 is placed over this spacer 33, and Modulation electrode 14
The distance between them is kept constant. The linear hot cathode 11 is fixed at a fixed point P in electrical contact with the exposed portion of the conductive pattern 32.

As mentioned above, the horizontal scanning of the electron beam is 1H.
During this period, one horizontal scan is performed within each horizontal block, and one horizontal scan of the entire screen is thereby completed during 1H. Vertical scanning is performed by shifting the voltage applied to the vertical address electrodes 13 in the vertical direction every 1H. Generally, 0V is applied to the vertical address electrode corresponding to the horizontal scanning line performing horizontal scanning, and a cutoff voltage (negative voltage) is applied to the other vertical address electrodes.

By storing the image data to be displayed in advance in a memory, reading out the image data in synchronization with the above-mentioned scanning, and applying a voltage corresponding to the image data to the modulating electrode 14 for each horizontal block, The amount of electron beam impinging on phosphor 22 is controlled. As a result, the image represented by the image data is displayed on the front plate 20, which is a display screen.

In the above embodiment, since the horizontal focusing/deflecting electrode 15 is shared by adjacent linear thermal cathodes 11, it is necessary to change the signal applied to the electrode 15 for horizontal scanning between odd and even stages. .

FIG. 7 shows a portion of the horizontal focusing/deflecting electrode 15 and the linear thermal cathode 11, and the horizontal focusing/deflecting electrodes are labeled 15a, 15b, and 15c for convenience. In a horizontal block with an odd number of stages, when performing horizontal scanning indicated by arrow S1, electrodes 15a, 1
5b are given sawtooth wave signals having waveforms as shown by a1 and b1, respectively.

Next, in the even-numbered stages, when performing horizontal scanning indicated by arrow S2 in a horizontal block including electrode 15b, sawtooth wave signals having waveforms as indicated by b2 and c2 are applied to electrodes 15b and 15c of this horizontal block, respectively. give. The electrode 15b acts as the right electrode of the linear hot cathode 11 in odd-numbered stages, and acts as the left-hand electrode in even-numbered stages.

Therefore, the horizontal scanning signal applied to the electrode 15b has a different waveform between odd-numbered stages and even-numbered stages. As shown in FIG. 8, a sawtooth wave signal b1 that rises linearly and obliquely is applied to the electrode 15b at odd-numbered stages, and a sawtooth-wave signal b2 that falls linearly and obliquely is applied to the even-numbered stages. It turns out.

[0033]

[Effects of the Invention] As described above, according to the present invention, the inside of the display device's envelope is vertically divided into multiple stages, and the horizontal scanning range of the electron beam generated from each linear hot cathode is The divided odd-numbered stages and even-numbered stages are set horizontally shifted by half of the horizontal scanning range, and each part of the linear hot cathode that generates the electron beam for display is arranged in a staggered manner. The scanning ranges are arranged in a checkerboard pattern. Support walls are provided at the boundaries of the horizontal scanning ranges to support the transparent front plate relative to the rear plate.

[0034] Since it is possible to fix the linear hot cathode to the rear plate at the position where the support wall is provided,
Even though the vertical length is long due to the large screen, the linear hot cathode is fixed within a short range, making it resistant to vibration. In addition, since it is possible to supply current separately to each stage of vertically divided linear hot cathodes, current is supplied separately to each short range of the linear hot cathode, and the current is The potential difference does not become too large, and an electron beam can be uniformly generated. Since each part of the linear hot cathode divided in a staggered arrangement only needs to be responsible for displaying a relatively narrow scanning range, a high-brightness display is possible even on a large screen.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a thin large-screen display device.

FIG. 2 is an enlarged cross-sectional view of the support wall.

FIG. 3 shows the arrangement and scanning range of a linear hot cathode.

FIG. 4 is a wiring diagram showing a circuit that supplies current to a linear hot cathode.

FIG. 5 is a sectional view showing details of a fixed portion of a linear hot cathode.

FIG. 6 is a plan view showing details of the fixed portion of the linear hot cathode.

FIG. 7 is a plan view illustrating horizontal scanning using a horizontal focusing/deflecting electrode and showing a portion of a horizontal focusing/deflecting electrode and a linear hot cathode.

FIG. 8 is a waveform diagram of a horizontal scanning signal for explaining horizontal scanning by horizontal focusing and deflecting electrodes.

[Explanation of symbols] 1A, 1B Current source 10 Rear plate 11 Linear thermal cathode 12 Support wall 13 Vertical address electrode 14 Modulation electrode 15, 15a, 15b, 15c Horizontal focusing/deflecting electrode 2
0 Transparent front plate 21 Transparent anode 22 Fluorescent material

Claims (3)

[Claims] [Claim 1] It is composed of a transparent front plate, a rear plate, and a side plate, and has an evacuated envelope, and a phosphor and an anode are provided on the inner surface of the transparent front plate, and a phosphor and an anode are provided on the inner surface of the rear plate. , a large number of vertical address electrodes extending in the horizontal direction and arranged in the vertical direction at slight intervals are provided; In a display device in which a plurality of linear thermal cathodes are arranged with a vertical axis, a modulating electrode is provided directly below each linear thermal cathode, and horizontal focusing and deflecting electrodes are arranged on both sides of the modulating electrode, the inside of the envelope is vertically aligned. is divided into multiple stages, and the horizontal scanning range of the electron beam generated from each linear hot cathode is set by shifting the horizontal scanning range by half of the horizontal scanning range between the vertically divided odd-numbered stages and even-numbered stages. A thin large screen display device characterized in that support walls are provided at the boundaries of the horizontal scanning range to support the transparent front plate relative to the rear plate. 2. The thin large screen display device according to claim 1, wherein the linear hot cathode is fixed to a rear plate at a position where the support wall is provided. 3. The thin large screen display device according to claim 1, wherein a current is separately supplied to each vertically divided stage of the linear hot cathode.