JPS6349735A - Substrate for liquid crystal panel - Google Patents

Abstract

PURPOSE:To prevent the generation of a defect by electrification even with high-density electrodes by forming oriented films on substrates with a soln. prepd. by adding an org. metal compd. of a chelate type to a soln. for straight chain high-polymer films consisting of polyamide, etc. CONSTITUTION:Many electrodes 12 of a matrix type, etc., are provided on the surfaces of glass base plates 11 for the substrates 1 for a liquid crystal panel and the high-polymer films 12 as the oriented films are formed thereon. The org. metal compd. of the chelate type is added to the soln. for the straight chain high-polymer films consisting of the polyamide, polyimide precursor, etc., as a means for controlling the resistivity of the oriented films. The oriented films are formed of such soln. The conductor is, therefore, uniformly distributed into the straight chain high polymer and since the advantages possessed by the straight chain high-polymer films can be effectively utilized as they are for the liquid crystal orientation characteristic, the electrification and the genera tion of the defect by the electrification are prevented even with the panel having the high-density electrodes.

Description

[Detailed description of the invention]

A] Industrial Application Field A substrate for a liquid crystal panel which is particularly suitable for use in display devices and shutters that utilize all the optical effects of the RJG crystal of the present invention, especially liquid crystal panels in which polarization is arranged at a high density. Regarding. [Background Art] Various types of alignment plates have been proposed for use in conventional liquid crystal panels. iF'-based or polyamide-based linear polymer coating'
t-A material rubbed in a specific direction is considered most suitable for practical use. The greatest advantages of these alignment films are the uniformity of the film quality and the excellent alignment of liquid crystal molecules. However, these linear polymer films have a resistivity of 10
2- Because it is very expensive, it is used as a display for recent computer terminals, a display for portable electronic appliances, or as a shutter.ii! II Image projection raft, former printer head, etc., the polarization of 3 on the liquid crystal panel is 2 to 2 in 1n.
When the density reaches 0, which is 1%, the alignment film is charged with high voltage iC during the manufacturing of the liquid crystal panel, especially during rubbing and stock carrying, which causes dissipation (burnout) between the electrodes, resulting in failure of the panel substrate. -The use of chelate-type metals handled in the present invention has been considered for some time.For example, JP-A-53-1
Publication No. 9045 describes the hydrolysis of 4 compounds of 4 gold and 1 Bx.
JP-A-56-70526 proposes the use of a hydrolysis reaction of a mixture of silicon and a chelate type metal. These methods are used to directly help align liquid crystal molecules with the hammered metal R, but the alignment given by rubbing changes depending on the type of liquid crystal and ring type, and may vary depending on the liquid crystal material and operation mode. λ cannot be used unless it is used in specific cases, so it is not practical.0 C) Problems to be Solved by the Invention The present invention takes into consideration the above-mentioned points, and the electrodes of liquid crystal panels are The present invention provides a panel in which the liquid crystal molecules are stably oriented even under such conditions, and no Ak failure due to IT occurs. 2] Measures to solve the problem Misfire 8A is a method in which a conductive substance is completely mixed into a linear polymer film, and specifically, it is a d-liquid for linear polymer films such as polyamide and polyimide precursors. A chelate-type organometallic compound is added to form an alignment film with a t-shaped bottom.
More preferably, oxides/or hydroxides of indium, tin, titanium, and/or the like are mixed. Although the overall resistivity decreases, it does not affect the orientation properties. Since indium, tin, titanium, or their oxides are colorless, they do not adversely affect the electro-optical effect of the liquid crystal. Figure 1 is a cross-sectional view of the liquid crystal panel used in the present invention, with a matrix ffl on the surface of the glass base σ4J11υ.
A large number of electrodes (transparent electrodes: I To ) uc(12
What is 1... and on it is a polymer film as an alignment film (a liquid crystal panel substrate (1) with a 14 α increase) (1) from 90° to
A 290° helical structure sandwiching the liquid crystal layer (2) that illuminates the whole,
A liquid crystal panel is formed by arranging at least 10,000 polarizing plates (3). And the liquid crystal panel substrate (Evan 1's polymer film A5α3 is introduced and treated in the form of a VCC centripetal chelate type organic polymer compound to reduce the resistivity.) The resistivity of the alignment film is 1. As a means of adjusting,
A method of dispersing fine powder such as snow or carbon in the alignment film is considered, but it is difficult to uniformly disperse it in the K foam bath medium1.Furthermore, it is difficult to disperse fine powder such as snow or carbon in the alignment film because it sediments and separates in the solution state. Custom order after membrane is unstable. Therefore, in the present invention, a stable chelate type organic metal is used which is soluble in N-methyl-2-pyrrolidone, NLN-dimethylsulfoxide, N-dimethylsulfamide, etc., which are often used as coating solvents for posiamide and polyimide precursors. A method is used in which the material for the alignment film is coated and fired, and the gold JA or gold E4 (water) oxide produced by medium-rate thermal decomposition is uniformly dispersed in the entire alignment.The resistivity of the alignment film is determined by the chelate type growth that is mixed in. Therefore, the selected chelate metal compound must be stable and capable of being thermally decomposed into light at the processing temperature of the alignment film bottom film. It is also necessary to consider the coloring of the film, the adjustment of resistivity, and the chemical influence on the liquid crystal material.It appears that metal chelate of acetylacetone is appropriate as one that satisfies these conditions.Among them, ( M-,In,Sn,'
rt gold xi powder] is suitable for carrying out the present invention because the oxide has little coloration. This will be explained in detail below. To 100 parts by weight of polyimide forenail body U solution (P7 1.0
, 2.0 each heavy part was dissolved. This was coated on a glass substrate with Jimei T & poles by the bisbinner method and baked at 300"C for 10 minutes to give a # of about 10,001.
It was made into a film. This! 10% PH, 25℃ atmosphere! flf
The total amount of static electricity generated was measured while applying 10,000 r. As a result, it was found that the static electricity generated by the electrostatic filter changes -r as shown in Figure 2, curve fl(A). However, since this data fluctuates depending on factors such as the relative humidity of Rubbing 4L Rubbing Material JX1, Figure 1 shows data when specific conditions are given for comparison. Also, depending on the amount of addition, the resistivity of the alignment film changes, so it depends on the size of the liquid crystal panel. 1! It is necessary to find the optimum value by referring to this custom-made drawing according to the extreme condition. Among the liquid crystal panel substrates obtained as described above, indium acetylacetone was added it1. After rubbing the substrate at the base of the oscillator, a Mare k crystal Z
Hold L I-1840 at a thickness of 3 opm, and adjust the tilt angle of the long axis of the liquid crystal molecule with respect to the substrate surface.

[Pre-tilt angle] and height were added to 1.2° (25°C J't'a, which is the same value as the material containing acetylacetonindium swallow. Therefore, the electro-optics of the liquid crystal cell in the initial state It was confirmed that there was no effect on the effect.Next, as in the above example, acetylacetone tin was added as an additive and the evening magnetic generation was investigated!2 Figure 1 (B3 The same tendency was observed for a pretilt angle of 1. Also, iC.Niacetylacetone titanium was similarly investigated, but as shown in Fig. 22 (C), the pretilt angle was also g) Effects of the Invention As described above, according to the present invention, the conductor is uniformly distributed in the linear polymer, and the liquid crystal alignment and weight are controlled by the length of the linear tetramolecular film. Since Pfrt can be used as is, it is suitable for use in liquid crystal panels with high-density electrodes, as it can prevent electrification and defective gold due to electrification.In addition, in the present invention, Pfrt can be used in the form of a solution when forming an alignment film. Q

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a liquid crystal panel used in the present invention, and FIG. 2 is a characteristic diagram of a circuit according to the present invention. (1)...Liquid crystal panel substrate, [lIJ[1υ...
・Base, Ll shi u4°°°... to pole & u3 (131"
'...Polymer film (as alignment film), (2)...Liquid crystal layer.

Claims (1)

[Scope of Claims] 1) Formed from a base having high-density electrodes and a polyamide, polyimide precursor, or a mixed solution of these with a chelate-type organometallic compound added to the surface of the base in contact with the liquid crystal. A substrate for a liquid crystal panel, characterized in that it has a polymer film made of 2) The above-mentioned claim is characterized in that the polymer film has one or more selected from indium, tin, titanium, or their oxides or hydroxides introduced by the organometallic compound. 2. The liquid crystal panel substrate according to item 1.