JPS5915222A - Matrix type liquid crystal display element for thermal writing - Google Patents

Abstract

PURPOSE:To enable writing and erasing without any trouble and to enable displaying with good contrast by providing conductor layers contg. oxygen atoms on plural pieces of horizontal electrodes for thermal writing or erasing made of thin metallic films thereby performing orientation uniformly over the entire surface. CONSTITUTION:The 1st layer, which is plural pieces of horizontal electrodes 11(5) playing the role of a heater, is provided on the inside wall surface of a back substrate 10(4). The 2nd layer 12 of indium oxide or tin oxide is superposed thereon and an orientation layer 6 formed of a silane coupling agent is stuck thereon. The layer 6 sticks chemically and securely on the electrodes 5(11) by the effect of the oxygen in tin oxide or indium oxide. Since tin oxide and indium oxide are conductors, no charge-up arises; therefore, not only the orientation is uniform but also the writing and erasing of signals are accomplished with good contrast without any trouble.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention is capable of writing arbitrary characters or figures by applying heat and a cursed field using a smectic liquid crystal, or by applying only a small amount of heat. It is used to add and erase heat IQ input (heat IQ input ma).Regarding the IJ type liquid crystal display element (hereinafter simply referred to as a panel), it is especially useful as a heat exchanger for inputting or erasing heat. This is related to the structure of the plurality of horizontal poles used, with + being the pole.

3.Ha-Next technology and its problems The number of panels using 3-inch LCD is 14? Tono Son They
It has already been announced by Nisfu Corporation and the American company Kyrex. The structure of this panel will be explained with reference to a schematic cross-sectional view of FIG. The front substrate 1, which is the substrate forming the panel, is a 3 mm thick glass plate, and its inner wall surface has a sheet resistance value of 10 o(-).

A plurality of vertical polarizations 2 (a, b, ... n) are provided using transparent indium oxide conductors of /sq. n) An alignment layer 3 for aligning the long axis direction of the liquid crystal molecules perpendicularly to the substrate is formed using a silane coupling agent.

The other substrate, the rear substrate 4, is made of a glass plate with a thickness of 3 mm, like the front substrate 1, and its inner wall is formed with a metal thin film. (a 1 b,
...n) is provided. These multiple horizontal "1L poles 5 (a
,b,・n) surface? ;t, It's /on with the pattern.

And the plurality of vertical one poles 2 (a, b,...n)
Similarly to the surface of , there is an orientation 1-6 in which the long sleeves of the liquid crystal molecules are oriented perpendicularly to the α-plane substrate 4.

The front substrate 41 configured in this manner has several vertically polarized poles 2 (a, b, -n) and a plurality of horizontally polarized poles 5 (a + b
The smectic liquid crystal It' with a thickness of about 15 μm is rearranged in an ox row facing each other so that +・n) are orthogonal to each other.
I'm holding an i7k.

Next, the operation of the pile constructed as described above will be explained.

When in a smectic state without applying heat or vomiting, the orientation of the entire liquid crystal molecules is made irregular in advance. At this time, the entire panel scatters the incident light and appears cloudy. When a short current pulse is applied to the horizontal IL pole 5a, which acts as a heater, the temperature of the liquid crystal in the part in contact with the 1L pole increases. The temperature rises to become an isotropic liquid, and the liquid crystal molecules become irregularly oriented.

The liquid crystal heated to an isotropic liquid is rapidly cooled down, passes through the nematic state, and returns to the smectic state.

It is smectic, and before it returns to normal, liquid crystal molecules are easily felt. For example, when the vertical polarization 2b returns to the smectic state where a direct current field is applied, the horizontal LB pole 5a and the vertical polarization 2
The liquid crystal molecule 8 located at the intersection of b is perpendicular to the substrate 1.4 and becomes it\. (-Therefore, this part becomes transparent.The addition of the horizontal "Igoku 5a and the Bokai" makes the other vertical 1
The liquid crystal molecules 9 located at the intersections of the electrodes 2a, 2c, . Therefore, it scatters the incident light and appears white. This divine panel continues to maintain both states even if the power source is turned off (because it does not require Freso operation, it is suitable for matrix-type liquid crystal display elements with a large number of horizontal poles).

Incidentally, even in a panel having such a structure, it is important that the liquid crystal molecules be uniformly aligned in order to display images with good consistency, as in the case of a liquid crystal display element. However, as mentioned above, the liquid crystal 7 of the back 1ri board 4 and the 1st part are made of glass, and the horizontal and polarized parts 5 (a,
b,...n), it is difficult to obtain a uniform alignment (4+).Especially, the surface in contact with nichrome does not sag. This is thought to be due to the uneven formation of small particles due to insufficient oxygen ova for the strong bonding between silicon atoms and chromium atoms on the 6-nichrome surface. As a countermeasure in such a case, an insulating material that tends to chemically bond strongly with silicon atoms, such as 510 with a thickness of about 100
2fl'l films have been deposited on glass and nichrome surfaces by sputter deposition or the like to provide a uniform surface. However, this method requires two or more vertical and polar poles.
(a + b +...n) and 15 (a
There is no particular problem when the signal 11a applied between lb,...n) is an alternating current, but when using a direct current like this one, the liquid crystal 7 due to charge-up.
There is not enough ru world in between, making it impossible to perform the fence-clamping motion.

[Purpose of the invention]

Misfire [1] is aimed at improving the conventional drawbacks mentioned above, and is oriented [to evenly line the surface]. stomach,
The object of the present invention is to provide a channel in which writing and erasing operations can be performed without any trouble, and display with extremely high contrast can be achieved.

[Summary of the invention j'? ]

In order to achieve the above object, the channel according to the present invention includes a plurality of horizontal r ratio poles 5 (a Hb
+...n) (,i) A transparent electrode made of indium oxide, tin oxide, etc. is thinly superposed on -H of a heating element made of nichrome or the like.

〔Effect of the invention〕

In the present invention, based on the above idea, a plurality of horizontal poles 5 (, a + t) + .
) are bonded together, and then an alignment layer 6 formed using a silane coupling agent is attached. It is assumed that 1" is attached to the 1st pole 5 (a, b+...11) and 7.・As long as the acid 11 Nisma and indium oxide are used, the front H [2, Ti 4 ・-shiab] will not occur, so the present invention can be used (+tft L) only because the orientation is uniform. (Effect 75-) in which the aging and erasing of g-gin can be done with good contrast and without any problems.

[Embodiments of the invention]

The present invention will be described in detail below with reference to Figure rn1.

・In FIG. 2, a first layer of a plurality of transverse electrodes 11 (a, b, . . . 11) serving as a heater is provided on the inner wall surface of the rear substrate 10, and on top of this a first layer of indium oxide or indium oxide according to the present invention is provided. A second layer 12 (a.

b,...n) are combined to reveal a structure.

- To give an example, multiple horizontal lines, IC4 Kei 11 (a, b, ・
n) is the heating element material nichrome! 9. Its thickness is about 1
~1 μm. The second layer only functions as an adhesive to strongly bind the alignment layer (not shown), so it does not need to be thick, and a thickness of 50X or more is sufficient.

It is then chemically etched into a 791 specific shape.

In addition, in the embodiment, the second layer 12 (a, l:z...n)K
Indium oxide or acid (hysso) is used, but it is not necessarily limited to these. For example, it is also possible to deposit a substance that is easily oxidized, such as aluminum, by vapor deposition, and heat it to slightly oxidize the surface. .

Furthermore, a material prepared by mixing a metal such as nichrome with an oxidizing substance such as S io 2 and several tens of grams may be deposited by sputtering.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view for explaining the structure of a conventional thermal writing type liquid crystal display element, and FIG. 2 is a partially enlarged perspective view showing an embodiment of the present invention. 10... Rear board

Claims (1)

[Claims] A liquid crystal layer is placed between the transparent AiJ surface substrates and the front substrates are placed facing each other in parallel. Vertical bending poles for signals are made of a metal thin film on the inner wall surface of the rear substrate. A thermal writing matrix type liquid crystal display characterized by a conductor layer containing oxygen atoms provided on a plurality of side sail poles for thermal writing or erasing made of metal thin films. element.