JPS61199386A - Image displaying device - Google Patents

Abstract

PURPOSE:To extend the variation range of the brightness signal to obtain a brighter picture by modifying the deflecting voltage of respective element by a brightness signal and by executing the static deflecting by deflecting and modifying voltages that have a tonal information, against a matrix panel which consists of the elements in which the electrons are made focus on an flueorescent body from a linear cathode by said static deflection, which are arrayed in an matrix-shape. CONSTITUTION:Of a picture displaying device 11, the plane fluorescent body 12 is located in the front, deflecting grids 15l and 15r for horizontal deflection, a linear cathode 13 located between deflecting/modifying electrodes 14u and 14d, and an insulating plate 16 are arranged in column. The fluorescent body 12 is arrayed in matrix of, for instance, 8 lines and 180 columns, forming a matrix panel. To the deflecting/modifying electrodes 14u and 14d, a staircase saw-tooth waveform which is made symmetrical by two vertically neighboring electrodes is supplied as the deflecting voltage. By amplitude-modifying the mean value of the vertically coupled deflecting voltage in accordance with a brightness signal, the potential distribution in the vicinity of the linear cathode 13 varies, and thus the emission control is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a painter's display device in which elements using linear cathodes are arranged in a matrix.

[Conventional technology]

An image display device using a linear cathode instead of a cathode ray tube can easily make one image flat or make the device smaller and lighter. A conventional image display device 1 shown in FIG. 5 has a linear cathode 3 provided in front of a phosphor 2 in which a fluorescent surface is formed on a glass material serving as an anode electrode, and the linear cathode 3 emits electrons. of.

A pair of deflection electrodes 4u and 4ci arranged vertically to face each other
The light is electrostatically deflected and focused onto the phosphor 2.

At this time, the voltage level of the modulation electrode 6 provided on the back side of the linear cathode 3 is changed in correspondence with each horizontal pixel 5 on the phosphor 2, so that each pixel 5 has a brightness according to the brightness signal. tltlJ ll].

That is, the conventional image display device 1 converts video information into an image line by line from the upper side to the lower side of the phosphor 2 by line-sequential driving. It is necessary to apply a sawtooth voltage with completely opposite polarity to the first pole 4d, and the deflection circuit 7 and the lower deflection electrode 4
Between d.

A polarity inversion circuit 8 for inverting the polarity is interposed.

[Problem that the invention seeks to solve]

In the conventional image display device 1 described above, the resolution in the horizontal direction is determined by the number of pixels 5, that is, the number of modulation electrodes 6 on the back surface of the linear cathode 3, and when the pitch of the modulation electrodes 6 is narrowed, Since the isolation decreases due to interference between the cathodes 5 and 5, there is a certain limit to the resolution, and furthermore, the image is dark because sufficient brightness cannot be obtained, and the uneven emission of the linear cathode 3 tends to deteriorate the image quality. There was a problem.

[Means for solving problems]

This invention solves the above problems.

a matrix panel in which a plurality of elements are arranged in a matrix and display an image by converging electrons emitted from a linear cathode onto a phosphor and driving a plurality of pixels line-sequentially by electrostatic deflection; The gist is that each element is provided with deflection and modulation voltage generation means that modulates the deflection voltage necessary for electrostatic deflection using a luminance signal and provides gradation information to the deflection voltage.

[Effect]

This invention uses a multi-IJ panel in which elements in which electrons are focused on a phosphor by electrostatic deflection from a linear cathode are arranged in a matrix, and the deflection voltage of each element is modulated by a luminance signal. Electrostatic deflection is performed using a deflection and modulation voltage with one gradation information.

〔Example〕

Embodiment 1 of the present invention will be explained below, and FIGS. 1 to 4 will be explained below.
This will be explained with reference to the figures. 1 to 4 are a front view, a side view, two circuit configuration diagrams, and a signal waveform diagram of each part of the circuit, respectively, showing an embodiment of the image display device of the present invention.

In the image display device 11 in FIG. 1.2, a flat phosphor 12, which is made of a glass material with a fluorescent surface formed thereon and serves as an anode electrode, is located at the forefront, and as it goes toward the back, a deflection grid 15 for horizontal deflection is provided. /, 15r, deflection and modulation electrodes 14u, 14d
ζ-pinched linear cathode 13. The insulating plates 16 are arranged side by side, and the overall shape is extremely thin. When viewed from the front, the phosphor 12 is divided into a grid pattern by the polarization grids 151 and 15r and the linear cathode 13i.
Deflection and modulation polarization 14u, 15 facing vertically with the
The front projection plane of d corresponds to the image area of the first element 17. That is, in the phosphor body, elements 17 arranged in 8 rows and 180 columns are arranged in a matrix to form a matrix panel, and each element 17 has 3 pixels horizontally and 32 pixels L vertically.
It consists of 8 parts. Therefore, the phosphor 12 as a whole is as follows:
It consists of 829,440 pixels, and each element 17 has 3 horizontal pixels.
Since the pixels 18 are driven in the order of 0 fish, the number of pixels that determines the resolution of the image display device 11 is 27
It becomes 6480 pieces.

All the elements 17 constituting the phosphor 12 are driven by a drive circuit 21 to be described later, and all the pixels 18 are driven by a combination of point sequential driving and line sequential driving.

The drive circuit 21 is connected to the data processing circuit 2 as shown in FIG.
2 and a deflection circuit. The data processing circuit 22 includes an AD converter 2 that converts analog video signals into AD.
4, and a pair of frame memory circuits 25 and 26 that alternately store video signals converted into digital signals by the AD conversion II 241 in units of frames.

The shift register circuit 28 consists of 8 shift register circuits which are alternately supplied via the switching circuit 27.
Image information regarding X180 elements 17 is stored.

The deflection circuit n includes a sawtooth wave generation circuit 30 for vertical deflection and a sawtooth wave generation circuit 31 . The sawtooth wave generating circuit 30 for vertical deflection is connected to the shift register circuit 30, and generates a deflection and modulation voltage.
Vertical output circuit 32. as a deflection and modulation voltage generating means to be supplied to the deflection and modulation electrodes 7], 4u and 14d. It is connected to the sawtooth wave generation circuit 31 for horizontal deflection, generates a grid voltage, and applies this to the deflection grids 15J, 1 of each element 17.
5r.

The vertical deflection sawtooth wave generation circuit 30 is triggered by a vertical synchronization signal and generates a sawtooth wave with a vertical period (1v). This sawtooth wave is modulated by the luminance signal sent from the shift register circuit side in the vertical output circuit 32, and is made into a staircase waveform with 32 steps equal to the number of vertical pixels in the element 17. It is applied to the electrodes 14u and 14d.

That is, in the deflection and modulation electrodes 14 u and 14 d.

As shown in Fig. 4 fA) and (B), a step-like sawtooth wave with a symmetrical waveform at the upper and lower poles is applied as the deflection voltage. The average value is 4 degrees and 16 degrees (by adjusting the amplitude accordingly, the potential distribution in the vicinity of the linear cathode 13 changes, and emission control is performed. For example, if the above average value is higher than the convergent 4 voltage) By becoming negative, it becomes difficult for the electrons emitted from the linear can 13 to reach the phosphor 12. Therefore, by changing the rate of blocking the electrons from reaching the phosphor 12, the brightness of each pixel 18 increases. Saga black, gray.

The gradation is controlled like white.

On the other hand, the horizontal deflection sawtooth wave generation circuit 31 is triggered by a horizontal synchronization signal and generates a sawtooth number of horizontal periods (IH). This sawtooth wave is applied to the element 17 in the horizontal output circuit 33 as shown in FIG.
A stepped sawtooth waveform is formed into a three-step staircase waveform equal to the number of horizontal pixels in the waveform, and is applied to the left and right deflection grids 15g and 15r as a deflection voltage to the left and right deflection grids 151 and 15r. is left and right deflection grid 1! l
? , 15r have reverse polarity. For this reason.

The radiation emitted from the linear cathode 13 horizontally scans the three horizontal pixels 18 in the element 17 point-by-point with a period of 3H. Therefore, when looking at the unit of 17 elements, 3
The pixels 18 are point-sequentially scanned for each IH within a period of 8H. For this reason, of course, during this 8H period,
It is necessary to switch the luminance signal for each IH, and the shift register circuit 28 pulse-width modulates the luminance signal and supplies it to the vertical output circuit 32.

In this way, the image display device 11 has a linear cathode 1
Elements 17 that display one image by converging electrons emitted from 3 onto the phosphor 12 by electrostatic deflection are arranged in a matrix, and the deflection voltage of each element 17 is modulated by a luminance signal. Deflection and variation with one gradation information? Since the structure is configured to perform electrostatic deflection using At pressure, the linear cathode 3 (variable GT pole 6 that was previously assembled) is no longer required, and the number of pixels, which was previously limited by the number of variable '04' WL poles 6, is no longer required. is eliminated, the emission unevenness of the linear cathode 13 is eliminated, and at the same time, the adjacent pixel 1
8, and the range of change in the luminance signal is further expanded, making it possible to obtain a brighter image.

Furthermore, one image display device 11 includes pixels 18 that are driven line-sequentially.
Since the pixels 18 which are driven one point sequentially use the elements 17 arranged vertically and horizontally, and the M wheel signal for modulating the deflection voltage is a pulse width modulation signal with the same period as the one point sequential driving period, line sequential driving is performed. The information density of the image that can be handled by one element 17 can be sufficiently increased by scanning the pixels 18 to be driven using the vertical deflection and scanning the pixels 18 to be driven one by one using the horizontal deflection.

Even when a large screen is constructed by combining 1 and 1 x panels, sufficient image quality can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, elements that display one image by converging electrons emitted from a linear cathode onto a phosphor by electrostatic deflection are arranged in a matrix (arranged to form a matrix panel). As a result, the deflection voltage of each element is modulated by a luminance signal, and the deflection with one gradation information is performed, and the electrostatic deflection is performed by the modulation voltage. Therefore, the modulation ``1'', which was conventionally attached to a linear cathode, does not require a pole. Therefore, the restriction on the number of pixels, which was limited by the number of modulation electrodes, is eliminated.

The emission unevenness of the linear cathode is eliminated, and at the same time, the interference between adjacent pixels is reduced, and the range of change in the brightness scale is expanded, resulting in excellent effects such as being able to obtain a bright image.

Further, according to the present invention, pixels driven line-sequentially and pixels driven point-sequentially are arranged vertically and horizontally, and the luminance signal for modulating the deflection voltage is pulsed with the same period as the point-sequential drive period. Since it is a width modulation signal, the line)@ next pixel to be driven is scanned by vertical deflection to one point! 1. Which should be the primary drive. [
! By scanning the 1i element by horizontal deflection, it is possible to sufficiently increase the information density of the image that can be handled by one element, and even when a large screen is configured by further combining matrix panels, sufficient image quality can be obtained. It has the following effects:

[Brief explanation of the drawing]

1 to 4 are a front view, a side view, a circuit configuration diagram, and a signal waveform diagram of each part of the circuit, respectively, showing an embodiment of the image display device of the present invention. FIG. FIG. 1 is a perspective view showing an example of a conventional image display device. 11... Image display device, 12... Fluorescent material, 13...
- Linear candos, 14u, 14d-- Deflection and modulation electrodes, 151, 15r... Deflection grid, 17-
... Element, 18... Pixel, 21... Drive circuit, 32
...Vertical output circuit. Figure 1 Figure 2

Claims (2)

[Claims] (1) A matrix panel in which multiple elements are arranged in a matrix to display an image by converging electrons emitted from a linear cathode onto a phosphor and driving multiple pixels line-by-line using electrostatic deflection. and a deflection and modulation voltage generating means for modulating a deflection voltage necessary for electrostatic deflection with a luminance signal for each element and giving gradation information to the deflection voltage. (2) In the element, pixels driven line-sequentially and pixels driven point-sequentially are arranged vertically and horizontally, and the luminance signal is
2. The image display device according to claim 1, wherein the pulse width modulation signal has the same period as the dot sequential drive period.