JPS59121742A - Picture element - Google Patents

Abstract

PURPOSE:To obtain the captioned picture element excellent in its high-density and a high-speed writing performance, by generating partial temperature rise on substance by means of heat generation caused by the collision of electrons, and recording or displaying the picture by means of a state change generated before and after the temperature- rise hysteresis of the substance. CONSTITUTION:A glass substrate 3 is placed opposite to the front face part 1' of a glass tube 1 through a spacer 6 and in the gap between them a liquid crystal substance 7 is sandwiched. When observing said substance 7 from the front face of the glass tube 1 by scanning the picture element during turning ON and OFF electron current, the whole side of said substance 7 is transparent at the initial state, but after scanning the electron current over the whole side thereof, liquid crystal substance located only on a spot which is irradiated with the electron current having sufficient intensity comes in an optical turbulent state, and a picture writing by means of white turbid spot is carried out on a transparent back (mirror surface by aluminum film 5). The picture once written is stored semipermanently until it is irradiated by electron current again. Also, said picture once written is also used as a projection-type element which is observed by projecting its surface picture by means of radiation ray coming from outside.

Description

[Detailed description of the invention] The present invention relates to a heat storage type recording/display element.

As an element capable of high-density recording and display, a liquid crystal cell with a structure in which a liquid crystal substance is sandwiched between two substrates is used as a laser thermal writing liquid crystal element, which stores an image by irradiating a laser beam onto the liquid crystal cell, or on the substrate of the liquid crystal cell. Il! using the Ziehl heat generated by passing a current through the provided heater 1&. A Ziehl hot-sodium liquid crystal device and the like which write a II image are known. All of these utilize the electrical≠thermo-optical effect of liquid crystals. That is, when a thin layer of cholesteric liquid crystal or smectic liquid crystal exhibiting a transparent liquid crystal structure is partially heated and rapidly cooled, that portion generally transitions to an opaque liquid crystal structure that scatters light. A laser thermal writing liquid crystal element utilizes this phenomenon to write an image by irradiating and scanning a laser beam to cause the liquid crystal material in the irradiated area to move into a light scattering pattern. The trapped image can be erased by uniformly applying a direct voltage to the liquid crystal cell. In addition, electrodes with an XY matrix configuration are formed in the liquid crystal cell, and a direct current is applied to one pole (for example, the The Joule thermal bonding liquid crystal element is used to write the artist's information. In this case, one pole on the opposing substrate (here, the X electrode) is used to selectively apply an electric field between the X′-pole and the Y-pole during the cooling process after the liquid crystal material is heated. It will be done. By such driving, the liquid crystal material within the pixel formed at the intersection of the X electrodes can be selectively shifted to a light scattering state. because,
A thin liquid crystal layer that is heated and rapidly cooled will become light-scattering, but if an electric field is applied during cooling, the liquid crystal molecules will be aligned due to the electric field and will become transparent without becoming light-scattering. It is from. In this Ziehl thermal writing liquid crystal element, data can be rewritten sequentially. These laser thermal writing liquid crystal elements and Joule thermal bending liquid crystal elements are used as image recording elements or direct-view display elements for directly viewing suppressed images, and are also used as a light source for projecting written images.
It is also used as a projection type display element that uses an optical system to project images for viewing. The above is a conventional example of a thermal writing type recording/display element using liquid crystal, but arrays using materials other than liquid crystal are also known. For example, using a head lined with heating resistors, Ag! There is a thermal recording/display element that writes an image by giving an altitude change to an inorganic substance such as Hg I4.

Furthermore, some recording/display elements using writing methods other than the thermal writing method are also known. In that column, a photoconductive acid film is formed on one side of the substrate of the liquid crystal cell, and a display screen such as C1 (, T (cathode ray tube)) is projected onto the photoconductive film, and the optical image is converted into a voltage distribution image. This is a light-pumping liquid crystal element that records an image on the liquid crystal thin film by converting the image into a liquid crystal thin film and applying distributed helical pressure to the liquid crystal thin film according to the image.As mentioned above, the device records and displays images. However, at present, no element has been obtained that satisfies the two performances of high-density writing and high-speed writing required for recording/display elements. The built-in liquid crystal element P can perform high-density writing, but it cannot write at high speed because it scans with laser light, and the Ziehl thermal scanning liquid crystal element requires a smaller recording/display area in order to increase the speed. In this case, there is a limit to the electrode density and higher density cannot be achieved.Furthermore, in the thermal writing method using inorganic materials, the heating resistor head is mechanically scanned. On the other hand, in optical writing liquid crystal elements, the II!II image is C
High-density writing is not possible because it is restricted by the RT screen. In addition, even with various recording/display elements not described here, the current situation is that the two performances of high-density writing and high-speed writing have not yet been satisfied.

An object of the present invention is to provide an image element that has excellent performance in two aspects: high-density writing and high-speed writing.

The image confectionery of the present invention uses heat generated by collision of electrons to cause a partial temperature rise in a substance by −1=, and places the temperature in a part of the substance that has experienced the temperature increase by 1 before and after the history of the temperature increase by 1. The feature is that images are recorded or displayed using the resulting rB changes.

To prevent this, the present invention includes a vacuum container, an electron gun installed in the vacuum container, a deflector that changes the course of 'WLf emitted from the electron gun, and a display unit installed in a position facing the electron gun in the vacuum container. The display section is further comprised of a display surface having a material whose texture changes before and after the temperature rise history, and means for changing the state of the material to its initial state.

Next, the present invention will be described in detail with reference to the drawings.

The figure is a sectional view showing an embodiment of the image element of the present invention.

In the figure, l is a glass tube, the inside of which is l0TOrr
I am stuck in a certain vacuum. Also, the front part 1' of the glass tube 1
A transparent electrode 2 is formed on the inner surface. 3 is a glass substrate, on the side opposite to the front surface 1' of the glass v1, a transparent electrode 1if4 is formed, and on the opposite side, an A/film 5 is formed.
ing. The glass substrate 3 faces the front surface 1' of the glass tube 1 with a spacer 6 in between, and a liquid crystal material 7 is held in the gap. Reference numeral 8 is a cathode, and the electrons ejected from this are extracted by the anode 9 and become an electron current io, which is transferred to the AI! of the glass substrate 3. It collides with the membrane 5. This electron flow 10
The strength of is controlled by grid electricity 4iBu, and
Its direction is controlled by the deflection coil 12. The image quality element having such a structure is configured as a normal octyl layer as the liquid crystal material 7, and the glass tube l is scanned while turning on and off the electron flow.
When observing the front surface of the liquid crystal material 7, it was found that the entire surface of the liquid crystal material 7 was transparent in the initial state, but after scanning the entire surface with the electron flow, the liquid crystal material scattered light only in spots that were irradiated with a sufficiently strong electron flow. transparent background (1-1 film 5)
It was possible to write an image using a cloudy spot on the mirror surface). Once an image is written, it will be stored semi-permanently unless the electron current irradiation is restarted. - Erasing of the written image could also be carried out by applying a voltage to the bright electrodes 2 and 4 and applying an electric field to the liquid crystal material 7.

In this way, the image element of this embodiment was shown to operate as a storage scope. About 1,000 lines could be written at a high density on a 16ityi high display surface, and the writing speed was about 30 m5 per screen. The boiling speed is the same as (j%T), but the reason why high-density writing is 11f is that ca'i' requires a large beam magnetic current for the phosphor to emit light, and as a result, a certain Compared to the beam diameter of 0.2 yJ1 degree,
In the image element of this example, the liquid crystal material is heated at 40'O
This is thought to be because it is sufficient to increase the beam diameter to a certain extent, and therefore writing can be performed by using a secondary stream with a beam diameter of 14 fl. This can be understood by T. et al., who say that the energy 1 eV obtained by electrons when accelerating - number of electrons with a potential difference of 12 can reach 11,605 k when converted to mountain crust. In this way, according to the image element of this example, the laser heat "
Light-occupied liquid crystal element F produces high-density images comparable to liquid crystal elements that contain light.
At about the same level, [I was able to write. ] 3. 1 of this example! 'ff KR is not only used as a direct view type image display tube, but also uses external readout light to irradiate the display surface.
When the reflected light from the film is detected, the recording element and memory 'J
Similarly, it can also be used as a projection type 1 display element in which a display image is projected and viewed using reflected light from outside.

In the above, the image element of the present invention has been described with reference to an embodiment using a liquid crystal material, but a material such as a mercury iodide-based inorganic material is coated on the inner surface of the display surface 1' of the glass tube l, and an At film is applied thereon. Formed t141'? Even in the i[1114M element, high density and high speed writing were realized by the Ig(irradiation) of the electron current.
It goes without saying that the value η'rl may be any value that causes a change in shape in the front plate of the history of temperature rise.

As described above, according to the present invention, an image element having excellent performance in both high-density writing and high-speed writing can be obtained.

[Brief explanation of the drawing]

The figure is a cross-sectional view of one embodiment of the image element of the present invention, where l is a glass tube, 1' is the front part of the glass tube, 2 is a transparent electrode, and 3
is a glass substrate, 4 is a transparent electrode, 5 is an M film, 6 is a spacer, 7 is a liquid crystal material, 8 is a cathode 9 is an @ pole, IO is an electron current,
11 is a grid electrode, and 12 is a deflection coil. Representative Patent Attorney Susumu Uchihara

Claims (1)

[Claims] The device includes a vacuum container, an electron gun installed in the vacuum container, a deflector that changes the course of electrons emitted from the electron gun, and a display section installed in the vacuum container at a position facing the electron gun. In the image element, the display section includes a display surface having a substance that causes an amic state change before and after a history of temperature rise, and means for changing the state of the substance to an initial state before the temperature rise. An image element characterized by: