A passive vertically oriented full-viewing angle liquid crystal display and its manufacturing method

Abstract

The present invention relates to a passive vertically oriented full-viewing angle liquid crystal display and a manufacturing method thereof, wherein the display comprises a first glass substrate and a second glass substrate which are arranged in parallel and relatively spaced apart, wherein a first ITO layer with a plurality of circular holes is provided on the first glass substrate; a second ITO layer with a plurality of strip holes is provided on the second glass substrate; the circular holes and the strip holes are arranged in a staggered manner; a first oriented layer is coated on the first ITO layer; a second oriented layer is coated on the second ITO layer; both the first oriented layer and the second oriented layer are oriented layers which have not been rubbed; and liquid crystal molecules are filled between the first oriented layer and the second oriented layer. The present invention solves the problem of a "dead angle" of viewing angle of a vertically oriented liquid crystal display at a certain angle, and eliminates the PI rubbing process in the production process, thereby simplifying the production process and enabling the process to be better controlled.

Description

Technical Field

[0001] The invention relates to the field of display screens, and in particular to a passive vertically oriented full-viewing angle liquid crystal display and a manufacturing method thereof. Background Art

[0002] The existing production process of vertical alignment liquid crystal display is as follows: substrate cleaning -> ITO pattern making -> PI coating -> PI curing -> PI friction -> intermediate powder spraying -> frame screen printing -> upper and lower basic bonding -> glass cutting -> liquid crystal filling -> filling port sealing -> polarizer lamination. Figure 1 is a schematic diagram of the liquid crystal molecule distribution, electric field distribution and friction direction of the existing vertical alignment liquid crystal display before and after power is turned on. Figure 1a and Figure 1b It can be seen from the above that the existing vertical alignment liquid crystal display has a pre-tilt angle of all PI (alignment layer) after rubbing, which is biased towards the rubbing direction (in Figure 1a and Figure 1b In the figure, the arrow parallel to the direction of the first glass substrate or / and the second glass substrate is the rubbing direction, and the arrow perpendicular to the direction of the first glass substrate or / and the second glass substrate is the electric field direction). The pretilt angle is about 89 degrees. After power is turned on, the liquid crystal molecules are deflected in one direction under the action of the PI anchoring pretilt angle due to the vertical electric field. Due to the optical bitropy of the liquid crystal molecules, the vertically oriented liquid crystal display has a viewing angle "dead angle" at a certain angle. In addition, in the existing production process of vertically oriented liquid crystal displays, the most difficult thing to control is the friction depth control of PI, which is closely related to the temperature and humidity of the environment and the stability of the equipment. At present, the problems caused by friction include display black spots, ghosting, PI electrostatic burns, etc. If the PI friction is not well controlled, the entire batch of displays will be scrapped, which not only affects the production efficiency but also causes great losses. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a passive vertically-oriented full-viewing angle liquid crystal display and a method for manufacturing the same, which solves the problem of the vertically-oriented liquid crystal display having a "blind angle" of viewing angle at a certain angle, and eliminates the PI friction process in the production process, thereby simplifying the production process and enabling the process to be better controlled.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a passive vertically aligned full-viewing angle liquid crystal display, comprising a first glass substrate and a second glass substrate which are arranged in parallel and relatively spaced apart, a first ITO layer with a plurality of circular holes is provided on a surface of the first glass substrate which is opposite to the second glass substrate, and the plurality of circular holes are distributed in the first ITO layer in the form of an array; a second ITO layer with a plurality of strip holes is provided on a surface of the second glass substrate which is opposite to the first glass substrate, and the plurality of strip holes are distributed in the second ITO layer in the form of an array; the circular holes and the strip holes are arranged alternately; a first orientation layer is coated on the first ITO layer, and the first ITO layer is wrapped between the first glass substrate and the first orientation layer; a second orientation layer is coated on the second ITO layer, and the second ITO layer is wrapped between the second glass substrate and the second orientation layer; the first orientation layer and the second orientation layer are both orientation layers that have not been rubbed; liquid crystal molecules are filled between the first orientation layer and the second orientation layer.

[0005] Based on the above technical solution, the present invention can also be improved as follows.

[0006] Furthermore, the center of the circular hole is opposite to the center between two corresponding adjacent strip holes in the width direction of the strip holes.

[0007] Furthermore, the diameter of the circular hole is 10 μm, and the size of the strip hole is 50×10 μm.

[0008] Furthermore, in the length direction of the strip-shaped holes, the distance between any two adjacent strip-shaped holes is 30 μm; in the width direction of the strip-shaped holes, the distance between any two adjacent strip-shaped holes is 70 μm.

[0009] The beneficial effects of the present invention are as follows: a passive vertically oriented full-viewing angle liquid crystal display of the present invention designs holes of different shapes on the display ITO wiring, which has the advantage that the direction of the electric field after power-on is no longer a vertical electric field up and down, but after power-on, due to the influence of the holes on the ITO layer, the electric field arrangement is inclined and divergent around with the circular hole as the center, so that the driving electric field forms a divergent electric field to achieve the effect of multi-domain liquid crystal display, solving the problem of the vertically oriented liquid crystal display having a viewing angle "dead angle" at a certain angle.

[0010] Based on the above passive vertically-aligned full-viewing-angle liquid crystal display, the present invention further provides a method for manufacturing the passive vertically-aligned full-viewing-angle liquid crystal display.

[0011] A method for manufacturing a passive vertically oriented full-viewing angle liquid crystal display, the method for manufacturing the passive vertically oriented full-viewing angle liquid crystal display as described above, comprising the following steps:

[0012] S1, forming a first ITO layer with a circular hole array on a first glass substrate, and forming a second ITO layer with a strip hole array on a second glass substrate;

[0013] S2, forming a first alignment layer free from friction on the first ITO layer, and forming a second alignment layer free from friction on the second ITO layer;

[0014] S3, manufacturing an empty glass box by laminating the first glass substrate with the first ITO layer and the first alignment layer and the second glass substrate with the second ITO layer and the second alignment layer;

[0015] S4, filling the empty glass box with liquid crystal molecules and sealing it.

[0016] Based on the above technical solution, the present invention can also be improved as follows.

[0017] Further, the S1 is specifically:

[0018] S11, coating an ITO film on the first glass substrate and the second glass substrate respectively;

[0019] S12, etching a circular hole array on the ITO film of the first glass substrate by photolithography to form the first ITO layer; etching a strip hole array on the ITO film of the second glass substrate by photolithography to form the second ITO layer.

[0020] Further, the S2 is specifically:

[0021] A layer of alignment agent is coated on the first ITO layer and the second ITO layer respectively and cured to form the first alignment layer and the second alignment layer accordingly.

[0022] The beneficial effects of the present invention are as follows: the passive vertically-oriented full-viewing angle liquid crystal display manufactured by the manufacturing method of the present invention can solve the problem of the vertically-oriented liquid crystal display having a viewing angle "dead angle" at a certain angle; in addition, the manufacturing method eliminates the most difficult-to-control PI friction process, thereby simplifying the process flow and achieving a qualitative improvement in the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1a A schematic diagram of the liquid crystal molecule distribution, electric field distribution and rubbing direction of a conventional vertically aligned liquid crystal display before power is supplied;

[0024] Figure 1b A schematic diagram of the liquid crystal molecule distribution, electric field distribution and rubbing direction after power is applied to an existing vertically aligned liquid crystal display;

[0025] Figure 2a It is a schematic structural diagram of a first glass substrate with a first ITO layer in a passive vertically aligned full-viewing angle liquid crystal display of the present invention;

[0026] Figure 2b It is a schematic structural diagram of a second glass substrate with a second ITO layer in a passive vertically aligned full-viewing angle liquid crystal display of the present invention;

[0027] Figure 3 for Figure 2a and Figure 2b Schematic diagram of the structure after bonding;

[0028] Figure 4 for Figure 3 Schematic diagram of the local structure in;

[0029] Figure 5a A top view of the electric field distribution of a passive vertically aligned full-viewing angle liquid crystal display after power is turned on in the present invention;

[0030] Figure 5b This is a cross-sectional view of the electric field distribution of a passive vertically aligned full-viewing angle liquid crystal display after power is turned on;

[0031] Figure 6a A schematic diagram of the liquid crystal molecule distribution and electric field distribution of a passive vertically aligned full-viewing angle liquid crystal display before power is turned on in the present invention;

[0032] Figure 6b A schematic diagram of the distribution of liquid crystal molecules and electric field after power is applied to a passive vertically aligned full-viewing angle liquid crystal display according to the present invention;

[0033] Figure 7 A top view of the distribution of liquid crystal molecules and electric field after power is applied to a passive vertically aligned full-viewing angle liquid crystal display of the present invention;

[0034] Figure 8 The present invention is a flow chart of a method for manufacturing a passive vertically-oriented full-viewing angle liquid crystal display.

[0035] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0036] 1. First glass substrate, 2. Second glass substrate, 3. Round hole, 4. First ITO layer, 5. Strip hole, 6. Second ITO layer, 7. First alignment layer, 8. Second alignment layer, 9. Liquid crystal molecules. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] like Figure 2a , Figure 2b , Figure 3 , Figure 4 , Figure 5a , Figure 5b , Figure 6a and Figure 6b As shown, a passive vertically aligned full-viewing angle liquid crystal display comprises a first glass substrate 1 and a second glass substrate 2 which are arranged in parallel and at an interval relative to each other, a first ITO layer 4 with a plurality of circular holes 3 is provided on a surface of the first glass substrate 1 opposite to the second glass substrate 2, and the plurality of circular holes 3 are distributed in the first ITO layer 4 in the form of an array; a second ITO layer 6 with a plurality of strip holes 5 is provided on a surface of the second glass substrate 2 opposite to the first glass substrate 1, and the plurality of strip holes 5 are distributed in the second ITO layer 6 in the form of an array; the circular holes 3 and the strip holes 5 are arranged alternately; a first orientation layer 7 is coated on the first ITO layer 4, and the first ITO layer 4 is wrapped between the first glass substrate 1 and the first orientation layer 7; a second orientation layer 8 is coated on the second ITO layer 2, and the second ITO layer 6 is wrapped between the second glass substrate 2 and the second orientation layer 8; both the first orientation layer 7 and the second orientation layer 8 are orientation layers that have not been rubbed; liquid crystal molecules 9 are filled between the first orientation layer 7 and the second orientation layer 8.

[0039] In this specific embodiment:

[0040] Specifically, the center of the circular hole is opposite to the center between two adjacent strip holes in the width direction of the strip holes. Figure 4 As shown, the diameter of the circular hole is 10 μm, and the size of the strip hole is 50×10 μm. In the length direction of the strip hole, the distance between any two adjacent strip holes is 30 μm; in the width direction of the strip hole, the distance between any two adjacent strip holes is 70 μm.

[0041] In a passive vertically aligned full-viewing angle liquid crystal display of the present invention, Figure 2a The circular hole 3 is designed in the first ITO layer 4. Figure 2b The strip holes 5 are designed in the second ITO layer 6. After the first glass substrate 1 and the second glass substrate 2 are bonded together, the circular holes 3 in the upper glass substrate 1 and the strip holes 5 in the second glass substrate 2 are arranged and distributed as shown in FIG. Figure 3As shown, after the first ITO layer 4 and the second ITO layer 6 are drilled, the first glass substrate 1 and the second glass substrate 2 are no longer a whole electrode after power is applied, so that the direction of the electric field will deflect toward the place where the ITO is present, and a certain angle of deflection can be formed. The deflection direction of the electric field is as shown in FIG. Figure 5a and Figure 5b As shown ( Figure 5a The direction indicated by the divergent arrows around the central circular hole 3 represents the direction of the electric field. Figure 5b The direction indicated by the arrow in the figure represents the direction of the electric field); specifically, the electric field radiates from the circular hole 3 to the surroundings to form a divergent electric field with a certain angle; after the passive vertically aligned full-viewing angle liquid crystal display of the present invention is powered on, the distribution of the liquid crystal molecules 9 and the electric field distribution are as follows Figure 7 As shown ( Figure 7 The direction indicated by the arrows between the liquid crystal molecules 9 is the direction of the electric field). By designing holes of different shapes on the display ITO wiring, the advantage is that the direction of the electric field after power is turned on is no longer a vertical electric field, but after power is turned on, the liquid crystal molecules are distributed and the electric field is arranged as follows due to the influence of the holes on the first glass substrate and the second glass substrate. Figure 6b and Figure 7 As shown (when no power is applied, the electric field is arranged as Figure 6a In addition, the first alignment layer 7 and the second alignment layer are alignment layers that have not been rubbed, so that the pre-tilt angles of the alignment layers are the same in all directions and are not biased in one direction. Under the two conditions of the holes affecting the electric field distribution and the frictionless alignment layer, the liquid crystal molecules 9 after being energized tilt in all directions to form a multi-domain liquid crystal display, that is, a full-viewing angle display.

[0042] Based on the above passive vertically-aligned full-viewing-angle liquid crystal display, the present invention further provides a method for manufacturing the passive vertically-aligned full-viewing-angle liquid crystal display.

[0043] like Figure 8 As shown, a method for manufacturing a passive vertically-oriented full-viewing angle liquid crystal display, the manufacturing method is used to manufacture the passive vertically-oriented full-viewing angle liquid crystal display as described above, comprising the following steps:

[0044] S1, forming a first ITO layer with a circular hole array on a first glass substrate, and forming a second ITO layer with a strip hole array on a second glass substrate;

[0045] S2, forming a first alignment layer free from friction on the first ITO layer, and forming a second alignment layer free from friction on the second ITO layer;

[0046] S3, manufacturing an empty glass box by laminating the first glass substrate with the first ITO layer and the first alignment layer and the second glass substrate with the second ITO layer and the second alignment layer;

[0047] S4, filling the empty glass box with liquid crystal molecules and sealing it.

[0048] In this specific embodiment:

[0049] The S1 is specifically:

[0050] S11, coating an ITO film on the first glass substrate and the second glass substrate respectively;

[0051] S12, etching a circular hole array on the ITO film of the first glass substrate by photolithography to form the first ITO layer; etching a strip hole array on the ITO film of the second glass substrate by photolithography to form the second ITO layer.

[0052] The S2 is specifically:

[0053] A layer of orientation agent is coated on the first ITO layer and the second ITO layer respectively and cured to form the first orientation layer and the second orientation layer respectively. The orientation agent is an organic polymer orientation material. Generally, the orientation agent used in the production of medium and low-end LCDs is PA (i.e., polyimide acid), which is generated by low-temperature polymerization of dianhydride and diamine. After dehydration and curing at high temperature (chemically a cyclization reaction), it becomes polyimide (PI, also called orientation layer). Polyimide has good chemical stability, excellent mechanical properties, high insulation, high temperature resistance, high dielectric constant, radiation resistance and non-flammability.

[0054] The passive vertically-oriented full-viewing angle liquid crystal display manufactured by the manufacturing method of the present invention can solve the problem of the vertically-oriented liquid crystal display having a viewing angle "blind spot" at a certain angle; in addition, the manufacturing method eliminates the most difficult-to-control PI friction process, thereby simplifying the process flow and achieving a qualitative improvement in the product yield.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A passive vertically aligned full-viewing angle liquid crystal display, comprising a first glass substrate and a second glass substrate arranged in parallel and spaced apart from each other, characterized in that: A first ITO layer with a plurality of circular holes is provided on one surface of the first glass substrate and opposite to the second glass substrate, and the plurality of circular holes are distributed in the first ITO layer in the form of an array; a second ITO layer with a plurality of strip holes is provided on one surface of the second glass substrate and opposite to the first glass substrate, and the plurality of strip holes are distributed in the second ITO layer in the form of an array; the circular holes and the strip holes are arranged alternately; a first orientation layer is coated on the first ITO layer, and the first ITO layer is wrapped between the first glass substrate and the first orientation layer; a second orientation layer is coated on the second ITO layer, and the second ITO layer is wrapped between the second glass substrate and the second orientation layer; both the first orientation layer and the second orientation layer are orientation layers that have not been rubbed; liquid crystal molecules are filled between the first orientation layer and the second orientation layer; The center of the circular hole is opposite to the center between two adjacent strip holes in the width direction of the strip holes; The first alignment layer and the second alignment layer are both formed by solidifying an organic polymer alignment material.

2. The passive vertical alignment full-viewing angle liquid crystal display according to claim 1, characterized in that: The diameter of the circular hole is 10 μm, and the size of the strip hole is 50×10 μm.

3. The passive vertical alignment full-viewing angle liquid crystal display according to claim 2, characterized in that: In the length direction of the strip-shaped holes, the distance between any two adjacent strip-shaped holes is 30 μm; in the width direction of the strip-shaped holes, the distance between any two adjacent strip-shaped holes is 70 μm.

4. A method for manufacturing a passive vertically aligned full-viewing angle liquid crystal display, characterized in that: The manufacturing method is used to manufacture the passive vertically aligned full-viewing angle liquid crystal display as described in any one of claims 1 to 3 above, The following steps are included: S1, forming a first ITO layer with a circular hole array on a first glass substrate, and forming a second ITO layer with a strip hole array on a second glass substrate; S2, forming a first alignment layer free from friction on the first ITO layer, and forming a second alignment layer free from friction on the second ITO layer; S3, manufacturing an empty glass box by laminating the first glass substrate with the first ITO layer and the first alignment layer and the second glass substrate with the second ITO layer and the second alignment layer; S4, filling the empty glass box with liquid crystal molecules and sealing it.

5. The method for manufacturing a passive vertically aligned full-viewing angle liquid crystal display according to claim 4, characterized in that: The S1 is specifically: S11, coating an ITO film on the first glass substrate and the second glass substrate respectively; S12, etching a circular hole array on the ITO film of the first glass substrate by photolithography to form the first ITO layer; etching a strip hole array on the ITO film of the second glass substrate by photolithography to form the second ITO layer.

6. The method for manufacturing a passive vertically aligned full-viewing angle liquid crystal display according to claim 4 or 5, characterized in that: The S2 is specifically: A layer of alignment agent is coated on the first ITO layer and the second ITO layer respectively and cured to form the first alignment layer and the second alignment layer accordingly.

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