JPS59121741A - Picture display element - Google Patents

Abstract

PURPOSE:To enable a high-density display to be carried out at a high speed capable of displaying a dynamic picture, by generating a partial temperature rise on substance by means of generation of heat caused by the collision of electrons, and utilizing the optical property of the part which changes instantaneously as the temperature rises, and then recovers to the former state. CONSTITUTION:While a liquid crystal substance 7 is irradiated with electron current, the temperature of said substance 7 continues to rise on account of the heat generated by the collision of electrons, and when the temperature of said substance 7 rises above the liquid crystal. liquid transition temperature, the picture part of said substance 7 becomes a liquid state temporarily. Next, when irradiation of electron current stops, the temperature begins to fall and reaches below the transition temperature, then the liquid crystal substance of the picture part returns to the former liquid crystal state. And, for instance, when said substance 7 is in a liquid crystal state, its dichloric coloring matter is uniformly orientated toward the direction perpendicular to the face of a substrate 3 by the effect of orientation-processing films 2 and 4 and said matter seems to be transparent (intensity of reflected rays is great). But, when said substance 7 becomes a liquid state, the liquid crystal molecules are turbulently oriented and colored. When the temperature falls again and said substance 7 returns to the former liquid crystal state, its light absorbing power is eliminated and said substance 7 returns to be transparent.

Description

[Detailed description of the invention] The present invention relates to a thermal writing type display element.

Thermal writing type display elements include laser-heated liquid crystal crystals and liquid crystal cells that irradiate a laser beam onto an 'Xs&' liquid crystal cell in which a liquid crystal material is sandwiched between two substrates to form an rJjJJ image. A Joule heat writing liquid crystal element '=5 is known, which writes an image using Zeel heat generated by passing radio waves through a heater electrode provided on a substrate. All of these utilize the mK thermo-optic effect of liquid crystal. fi
First, the fill layer of sulcholesteric liquid crystal or smectic liquid crystal, which exhibits a transparent liquid crystal structure, is partially heated.
Upon rapid cooling, the area is transferred to an opaque liquid crystal composition that generally scatters light. Taking advantage of this phenomenon 1. + Laser light! 41 Thermal writing liquid crystal material is used to write an image by converting the liquid crystal material in the irradiated area into a light-scattering state using Q-scanning. The written image can be erased by uniformly applying an electric field to the liquid crystal cell. Also, form an electrode of XY ma) +1 Kusunari on the liquid crystal cell and l't f5
, by applying a current to one electrode (for example, X′)
The liquid crystal material generates heat.
The Joule thermal writing liquid crystal element shifts the light to a light scattering state and fills in the 1LIII image. In this case, the electrode on the opposite substrate side (here, the Y electrode) is used to selectively apply an electric field between the X electrode, the Y electrode, and the Y electrode during the cooling process after the liquid crystal material is heated. .

By driving in this manner, the liquid crystal material within the pixel formed at the intersection of the X electrodes can be selectively shifted to a light scattering state. This is because the liquid crystal yt layer that is rapidly cooled becomes a light scattering state, but if a ton is applied during cooling, the liquid crystal molecule alignment effect due to the '1 degree field causes the #S scattering state to occur. This is because No. 1 has a negative effect (,=(). At 1ρ for this Joule heat writing liquid crystal element,
It is possible to sequentially overwrite the image.These laser heat reheating liquid crystal display devices and Joule heat reloading liquid crystal display devices can be used as direct-view type display elements that eliminate the written 1IiIl wave. It can also be used as a immersive display device in which the projected image is projected and viewed using a projection light/optical system.
I get hurt.

However, all of these liquid crystal display elements f have drawbacks. Although the laser-heated static crystal A can perform high-density writing, the writing speed is slow because the laser beam is deflected and scanned, and it is incapable of displaying moving images such as on a television screen. On the other hand, the Joule heat writing liquid crystal element is a direct-view type display element, and the writing process is slow, and it is also impossible to write the same.

In the case of a projection type display that can narrow the writing area of the display, high-speed writing is not possible, but in this case, 'ti'CIaj
There is a limit to the high density of high t;! JUG fortune telling, 4 is small nf ii+: roar. Therefore, υ
! It is not possible to display a density t (yt) at a writing speed j1t, which is also possible to invade Ljll. Examples using substances are also known. For example, a method of writing an image by partially changing the blackness on a true film without mercury iodide thread using a head lined with heating resistors. There is a display element.

However, in this case as well, since the heating resistor head is mechanically scanned and written, it is impossible to perform island-continuous occupancy.On the other hand,
As a method that enables high-speed reading, a photoconductive film is formed on one side of the substrate of the liquid crystal cell, and displays such as CRTs (cathode rays), etc. jp4 onto a photoconductive film,
There is a light-pumping liquid crystal element that converts the optical data into a Narita distribution image, distributes the image on a liquid crystal thin film according to the image, and writes an image on the liquid crystal thin film by applying an electric current of 1E. Although it is possible to display moving images with this method, it has the drawback that it cannot display high-density images because the image is limited to the C) LT screen.

Several other display devices have been devised, but ILI is still capable of displaying moving images and is capable of displaying the level of entertainment.
No Ii image-containing display element has been obtained.

Purpose of the invention!・,t, 1ifllI! The present invention would like to provide an image display element that is capable of displaying a high Vd value and capable of displaying a high Vd value.

The former P display element of the present invention uses heat generated by the child's doctor to cause a partial increase in blackness of the material by 1, and the optical properties of the part increase by -1-increase in degree of 3rd century. It is characterized in that the rIiIII image is displayed by recovering after an instantaneous change due to the

For this reason, the present invention uses a true gjF container and the ′, t! : A configuration comprising at least a ten gun, a deflector that changes the path of electrons emitted from the first electron gun, and a display section installed at a position V facing the electron gun in the vacuum container, Further, the display section is configured to include a display surface made of a material whose optical properties change when heated, and when the heating is removed, return to the first moon state before heating at time 1.

Next, 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 element of the present invention. In Figure 1, l is a glass tube with 1 inside.
The vacuum is about 0 Torr.

Further, an alignment treatment film 2 is provided on the inner surface of the front surface 1' of the glass tube l.
is formed. Reference numeral 3 denotes a glass substrate, and an alignment film 4 is formed on the side facing the front surface 1' of the glass tube 1, and a thin film 5 is formed on the opposite side. This glass substrate 3 faces the front surface 1' of the glass tube 1 with a spacer 6 interposed therebetween, and a liquid crystal substance 7 is held in the gap therebetween. Reference numeral 8 denotes an electrode, and the electrons that jump out here and there are extracted by the anode 9, become an electron flow 10, and collide with the glass substrate 30M film 5. The strength of this electron stream 10 is controlled by grid polarization 11 and its direction by deflection coils 12. An image element with such a structure, MJ & Atj
Quality 7! : Normal pentyl cyanobiphenyl (
The dichroic dye G202 (manufactured by Nippon Kanko Shiki Kenkyushin) was added to the dichroic dye G202 (manufactured by Nippon Kanko Shiki Kenkyushin) at a concentration of 1.0%. When observed from the front, a purple image is displayed on a transparent background (mirror surface formed by the AJ film 5) at a speed that follows that of a TV screen.The point is irradiated by an electron flow. Temperature change of liquid crystal material in (pixel) and AI! It shows changes in reflected light intensity observed through the film. The altitude of the liquid crystal material continues to rise during the period of being irradiated with the electron flow due to heat generation due to the collision of electrons. Then it exceeds 35'0). That is, that pixel portion of the liquid crystal material becomes temporarily in a liquid state.

Next, when the electron flow stops firing, the altitude begins to fall,
When the temperature drops below 'I''C, the liquid crystal material in the pixel portion that was in the liquid state returns to the liquid crystal state again.In this way, in the image display element of this embodiment, the liquid crystal material is heated by the irradiation of the electron flow, I-IJ )I4
L, there. That is, when it is in a liquid crystal state, the dichroic dye is uniformly aligned, and in this example, due to the effect of the alignment treatment films 2 and 4, the dichroic dye (+202 is aligned in the direction perpendicular to the substrate 30 surface). Because the dichroic dye does not absorb light, it becomes transparent (high intensity of reflected light). However, when the liquid crystal material becomes liquid, the orientation of the liquid crystal molecules is disturbed. As a result, the orientation of the dichroic pigment is disturbed, and as a result, absorption of light of a specific wavelength occurs, and that part appears colored (decrease in reflected light intensity). Light absorption by dichroic pigments 11! However, as the altitude decreases, the change is gradual, so the orientation of the liquid crystal molecules also occurs gradually, and the transition from colored to transparent occurs slowly. . In terms of driving, it is preferable that the height of the product material immediately before being shot is constant, and the actual height is 17.
At 1+11, the time taken for the liquid crystal product IW to return to the crystallinity before the electron flow + uJ radiation is defined as the frame time, and the crystal 7j
11. Time to return to 5'Pc when fielding. i1 and 12, the intensity of the electron flow is controlled so that the field time is about half the frame time. In this way, so-called interlaced scanning was performed to display a moving image.

The frame time is about 30tnS and the display density is 16X
Approximately 1,000 pieces (1,000 pieces) were covered on a llll-high display surface. The writing speed is the same as CIt 'I', but the M!I density writing is
Compared to the CRT, which requires a large beam current for the phosphor to emit light, and as a result, the beam diameter of the Boko flow expands to approximately 0.2iQmg degrees, this implementation The image element in the example is '11 da crystal! Since it is sufficient to raise the humidity slightly to about 40'0 for the 1"1 quality, writing is carried out using an electron stream with a very narrow beam diameter.
' 3) To-jie ``] Rero.

This means that the fl of I1+li'4? , when heated with a difference of 711 points in -r-min l■, the energy 1e is obtained.
This can be understood from the fact that when V is converted to altitude, it reaches 11,605K.

The image display element in the example I11;
It can be used as a projection type display that enlarges and projects the surface of Table 1 using a light source and an optical system.In particular, when used as a projection type display, compared to the method of projecting the display surface of Cit 'i'', the fi+ (It was confirmed that a bright screen could be obtained. 72' Oh, the display color was purple because we used 0202, which has a maximum absorption wavelength of 548 as a dichroic dye, but due to the selection of the dichroic dye... Display in any color other than black depending on θ4 is +iJ function: V-) It is also not true.

In addition, the flying and rising scans like the first line of the main wife are not in any way an attempt to improve the invention.

In the above, using the liquid crystal 'k>r '17F, the actual i+fl''
Although the image display element of the present invention has been explained for 911, the display surface I of glass trade
The inner cloth of ' is piled up and an Al film is formed on it.
+j'6 j')↑7+5. ′,
I actually saw one 1° speed drop. If we use 7-' to 4'11IIJ1 for the 7-element, as the altitude increases, its optical fiber quality will change to 7-'. There's no need to say it.

Since then, 'tc-j ''+ K s 4''r
, :yl (・r J: ]L(d ljl R residue-A
At the same speed as the iF can be used, an image display element with a melamic sieve density (+tJif) is irradiated.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the image element of the present invention,
1 is a glass tube, 1/ is the front part of the glass tube, 2 is an alignment film, 3 is a glass substrate, 4 is an alignment film, and 5 is AI! film,
6 is a spacer, 7 is a liquid crystal material, 8 is a cathode, 9 is an anode,
101 is a '6 child current, 11 is a grid electrode, and 12 is a deflection coil. FIG. 2 is a diagram illustrating the display principle in one embodiment of the image element of this paper. Representative Patent Attorney Susumu Uchihara (11)

Claims (1)

[Claims] a vacuum container, an electron gun installed in the vacuum container, an eccentric for changing the course of the electrons emitted from the electron gun, and a display section installed in the vacuum container at a position facing the electron gun. An image display element comprising: an image display element, wherein the display section includes a display surface made of a material whose optical properties change upon heating, and return to the initial state before heating over time when the heating is removed. element.