TW201316101A - Manufacturing method for liquid crystal display - Google Patents

Abstract

A manufacturing method for liquid crystal displays includes the following steps. First step is providing a first substrate having sealant frame thereon, and the sealant frame defines a display area. Next step is providing a jetting nozzle for forming liquid-crystal dots on the first substrate. The height of the liquid-crystal dots corresponds to that of the sealant frame. Next step is pressing a second substrate on the first substrate. When pressing the second substrate on the first substrate, a vacuum state between the second substrate and the first substrate is simultaneously reached so that the liquid-crystal dots are transformed as a liquid-crystal layer between the second substrate and the first substrate.

Description

Liquid crystal display panel manufacturing method

The present invention relates to a method of manufacturing a display panel, and more particularly to a method of fabricating a liquid crystal display panel.

In recent years, various flat panel display (FPD) technologies have been continuously developed, such as liquid crystal displays (LCDs), plasma displays (PDPs), and the like. Among the many flat panel display technologies, liquid crystal display technology is the most mature technology and is widely used in everyday electronic products. However, with the advent of large-size panels, liquid crystal display technology has continued to innovate to meet production, quality, cost and other requirements. The liquid crystal display has the advantages of power saving, light weight, no radiation and portability, and the thin film transistor liquid crystal display is most widely used, and has the characteristics of high resolution, high reaction rate, excellent image quality, etc. A breakthrough in wide viewing angle technology, applied to large-size TVs, such as LCD TVs with more than 52 inches.

The main structure of the liquid crystal display can be simply divided into a front-end color filter and a rear-end thin film transistor panel. The thin-film transistor panel can supply a voltage to turn the liquid crystal disposed between the two glass substrates to be responsible for light conduction. The conventional method of injecting liquid crystal is a siphon method in which two glass substrates are immersed in a liquid crystal cell, and then a liquid crystal is injected into between two glass substrates by capillary action, but such a liquid crystal injection process is extremely time consuming. And it is not easy to achieve a small gap of perfusion, so that the process yield is low. In response to the advent of large-size panel generations, in order to increase the speed of liquid crystal injection, some people adopt a so-called liquid crystal dropping (ODF) process, which mainly forms a sealant on a glass substrate, and then continuously coats the liquid crystal on the glass substrate. The material is then combined with two glass substrates and then subjected to alignment, solid baking and the like; in general, the ODF process can improve the efficiency of the conventional liquid crystal injection.

However, with the innovation of liquid crystal display technology, users are increasingly performing on liquid crystal displays. For example, the reaction time of the display must be shorter and shorter to avoid image sticking. The characteristics of the liquid crystal material are related to the overall performance of the liquid crystal display, but the liquid crystal material with good characteristics also indicates that the production end must bear a high material cost, and therefore, in the field of liquid crystal display production of the new generation, how to precisely control the liquid crystal material The cost of using it to avoid material waste will be a key to profitability. Especially for the application of 3D images, a material called fast liquid crystal (QLC) has been developed to make the display's reaction time short, thus reducing the problem of dynamic image sticking; on the other hand, the characteristics of fast liquid crystal can eliminate the need for backlights, Optical components such as filters can significantly reduce the production cost of the product.

After the actual cost analysis, although the ODF process can improve the efficiency of liquid crystal injection, it does not control the use of liquid crystal materials in the process, that is, the volume (weight) injected by the liquid crystal material during the injection process cannot be effectively calculated. That is, the injection amount cannot be accurately controlled, so the waste of the liquid crystal material is often caused, and this phenomenon makes the profit of the production end cannot be improved; on the other hand, the poor control of the injection amount of the liquid crystal material leads to the quality problem of the display, for example, liquid crystal. Too small amount of material injected will result in uneven edges, and too much injection of liquid crystal material will cause in-plane bubbles; in short, the conventional process cannot accurately and economically infuse liquid crystal materials, and the present invention addresses this problem. Solution. In addition, the unit price of the fast liquid crystal is quite high, so the traditional ODF process is not applicable.

One of the main objects of the present invention is to provide a method for manufacturing a liquid crystal display panel, which can accurately place a high-priced liquid crystal material on a substrate to substantially reduce the usage and cost of the liquid crystal material. In addition, the present invention can also increase the speed at which the liquid crystal layer is formed.

The invention provides a method for manufacturing a liquid crystal display panel, comprising the following steps:

Step 1: providing a first substrate, the first substrate is provided with an edge frame, and the edge frame system defines an image display area;

Step 2: providing at least one injection valve for performing a liquid crystal spraying operation, wherein the injection valve accurately and quantitatively applies a liquid crystal material to the image display area, wherein the liquid crystal material forms a plurality of liquid crystals corresponding to the edge frame Point;

Step 3: providing a second substrate for performing a pressing step, the second substrate is pressed down to the first substrate, and a vacuum is applied between the first substrate and the second substrate to uniformly disperse the liquid crystal dots A liquid crystal layer is formed on the image display area.

Therefore, with the method for manufacturing a liquid crystal display panel proposed by the present invention, the liquid crystal material can be applied to the substrate in a relatively accurate and economical manner. Therefore, in view of the high unit price of the liquid crystal material, the present invention can effectively control the use of the liquid crystal material, thereby achieving Strictly control the cost of materials. Further, in the manufacturing method of the present invention, the liquid crystal dots can be uniformly dispersed in the image display region by the contact force of the substrate pressing force and the gas pressure of the vacuum pumping to form a liquid crystal layer, so that the characteristics of the display panel can be made relatively excellent.

The invention provides a manufacturing method of a liquid crystal display panel, wherein the manufacturing method can effectively control the usage amount of the liquid crystal material, so that the invention can achieve the purpose of effectively controlling the cost for the liquid crystal material with high unit price. Furthermore, the present invention can precisely control the coating quality of the liquid crystal, so that a liquid crystal display panel of good quality can be manufactured.

Please refer to FIG. 1 , which shows the flow of a specific embodiment of the present invention. The steps of the manufacturing method of the present invention will be described in detail below. Please refer to FIG. 3 , step S101 : providing a first substrate 11 , which is provided on the first substrate 11 . There is an edge frame 12. In this step, a very thin edge frame is applied. First, an image display area is defined on the first substrate 11 by the edge frame 12, and the image display area is coated with a liquid crystal material. The area can be displayed by the control unit to display the picture and color. The edge frame 12 can be a sealant, or a sealant. In the present embodiment, the edge frame 12 can be made of a composition comprising acrylic resin, epoxy resin or the like, which can be used for ultraviolet rays. And/or heating to harden the composition. In addition, the edge frame 12 may further comprise an amine-containing amic hardener or a filler, such as alumina powder, etc., and the edge frame 12 can prevent the liquid crystal material from coming into contact with external moisture or impurities, and can prevent liquid crystal. The outflow of material, in other words, the edge frame 12 can be considered as a barrier to prevent outflow of liquid crystal. In addition, the edge frame 12 needs to bear a certain pressure in the subsequent process, so it needs to meet the requirement that the deformation does not cause excessive deformation under a certain pressure.

2 to 2B, step S103: providing at least one injection valve 2 for performing a liquid crystal spraying operation, wherein the injection valve 2 can accurately and quantitatively apply the liquid crystal material to the image display area at high speed and in a small amount, The invention is directed to a liquid crystal material having a relatively high unit price, and the liquid crystal material used in the embodiment has a price of about 100,000 yuan/CC, so the injection valve 2 is required to coat the liquid crystal material in a dot-like manner in a relatively precise manner. The image is displayed in the image display area defined by the edge frame 12, and the number of the injection valves 2 may be one or more.

In the present embodiment, the present invention can be applied to a supplier: Asymtek dispensing tool (model: DJ-2200). As shown in FIG. 2, the injection valve 2 has a body 21 having a storage slot 23A and a point therein. The rubber pipe 23B and the nozzle 25, and the piston 24 can be vertically displaced in the dispensing pipe 23B. When the conveying pipe 22 sends the liquid crystal material to the storage tank 23A and the dispensing pipe 23B, the piston 24 can be operated. A liquid crystal material is sprayed from the nozzle 25 to the first substrate 11 by a nozzle 25, and the liquid crystal material is formed into the liquid crystal dots 13A in a non-contact manner to be applied to the image display region, the liquid crystal material. The spraying method may be single-point spraying or multi-point spraying, and the single-point spraying means that the nozzle 25 sprays a sufficient amount of liquid crystal material at one time, and the multi-point spraying is to spray a sufficient amount of liquid crystal material for the nozzle 25 in several times. In the embodiment, the nozzles 25 are quickly ejected five times at a single location, giving each liquid crystal dot 13A a sufficient and precise volume/weight, as shown in Figures 2A and 2B. Furthermore, the injection valve 2 further has a constant temperature heating device 26 which can be heated for the liquid crystal material to maintain the temperature of the liquid crystal material, such as 50 to 70 ° C, to control the liquid crystal material to have a predetermined viscosity coefficient. It satisfies the jetting operation of the injection valve 2.

Preferably, the liquid crystal dots 13A formed by the nozzles 25 have the same pitch therebetween, in other words, the nozzles 25 can spray the liquid crystal dots 13A at a fixed pitch.

After actual calculation and verification, the dispensing tool used in the present invention can form a liquid crystal spot 13A of 0.008 mg/piece, and the error can be less than 1%. In addition, for subsequent press cooperation, the height of the liquid crystal dots 13A may correspond to the height of the edge frame 12, for example, slightly higher than the height of the edge frame 12. In the present embodiment, the height of the edge frame 12 is approximately 5um. Furthermore, in order to increase the speed of production, the speed of the above-mentioned injection valve 2 is about 150 to 200 points/second for the size of the eighth generation panel (2160×2460 mm ² ), but the dispensing speed can be in accordance with the size of the display panel. Increase it and adjust it at 200 points/second or more. It should be noted that the present invention only draws a single injection valve 2, and in actual production, the injection valve 2 can be arranged in multiple rows (as shown in Fig. 5), and the number of injection valves 2 per row is determined by the width of the first substrate 11. It is decided that the adjacent two rows of injection valves 2 can also be staggered to increase the overall dispensing speed.

On the other hand, the accuracy of the material sprayed by the injection valve 2 can be measured by a microbalance 29, and the present invention can perform the injection valve 2 before spraying, at intervals, or after a certain number of spraying operations. The discharge amount is checked to maintain the precise control of the liquid crystal dot 13A.

As shown in FIG. 3, the first substrate 11 has formed six liquid crystal dots 13A for representing that a plurality of liquid crystal dots 13A can be distributed on the first substrate 11 after the step S103.

4A, step S105: providing a second substrate 14 to perform a pressing step, the second substrate 14 is pressed down on the first substrate 11, and the vacuum is applied between the first substrate 11 and the second substrate 14 The liquid crystal dots 13A are uniformly and continuously formed in the image display region to form a liquid crystal layer 13B which is based on the thickness of the edge frame 12 (as shown in FIG. 4B, but the second substrate 14 is omitted in the drawing). In this step, the second substrate 14 is pressed down on the first substrate 11 while performing the pumping operation, so that the original single independent liquid crystal dots 13A are uniformly dispersed by the effect of pressure and pumping, and at the edge. A liquid crystal layer 13B is formed in the frame 12, and the liquid crystal layer 13B is sandwiched by the first substrate 11 and the second substrate 14 to form a display panel, and the height of the liquid crystal layer 13B is substantially the same as that of the edge frame 12. The height and the height of the liquid crystal layer 13B are effectively controlled to save cost of expensive liquid crystal materials. In this embodiment, the first substrate 11 and the second substrate 14 may each be a glass substrate.

In order to produce a uniform dispersion effect of the liquid crystal dots 13A, the edge frame 12 must generate a certain amount of compression on the pressure axis when subjected to pressure, so that the liquid crystal dots 13A can be dispersed by pressure, and the effect of pumping is The liquid crystal dots 13A are made more uniform in a direction parallel to the first substrate 11 (or the second substrate 14).

Accordingly, the manufacturing method disclosed by the present invention can form the liquid crystal material into the liquid crystal dots 13A with a relatively high precision, and then form the liquid crystal layer 13A into the layered liquid crystal layer 13B by the pressure of the substrate pressing and pumping, so that the material cost is high. Economical benefits can be achieved.

In summary, the present invention has the following advantages:

1. Has a very high economic value. Because the high-standard liquid crystal material belongs to a high monovalent material, if a conventional printing coating method is used, the amount of the liquid crystal material is inevitably controlled, and the high-priced liquid crystal material is wasted and cannot be used, resulting in an increase in cost; Quite precise calculation of the volume/weight of the liquid crystal dot according to the size of the panel, and then the liquid crystal material is formed on the substrate with low error according to the calculation result according to the calculation result, thereby forming a desired liquid crystal dot, thereby greatly reducing the liquid crystal dot. The cost of the producer.

2. On the other hand, the present invention utilizes the pressing force of the substrate to match the pressure generated by vacuuming, so that the liquid crystal dots can be dispersed to form a uniform liquid crystal layer, thereby reducing the defects of bubbles and edges of the liquid crystal layer, so that it can be fabricated. A high quality display panel.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the equivalents of the present invention are intended to be included within the scope of the present invention.

11. . . First substrate

12. . . Edge frame

13A. . . LCD point

13B. . . Liquid crystal layer

14. . . Second substrate

2. . . Injection valve

twenty one. . . Ontology

twenty two. . . Duct

23A. . . Storage tank

23B. . . Dispensing line

twenty four. . . piston

25. . . nozzle

26. . . heating equipment

29. . . Microbalance

S101～S105. . . Process step

1 is a flow chart showing a method of manufacturing a liquid crystal display panel of the present invention.

Figure 2 is a schematic view showing the injection valve of the present invention.

Fig. 2A is a schematic view showing that the injection valve of the present invention molds a liquid crystal material into liquid crystal dots.

Fig. 2B is a schematic view showing the injection valve of the present invention molding a liquid crystal material into another liquid crystal dot.

3 is a schematic view showing the formation of a plurality of liquid crystal dots on the first substrate of the present invention.

4A is a schematic view showing the second substrate of the present invention being pressed against the first substrate.

Fig. 4B is a schematic view showing the liquid crystal dot formed into a liquid crystal layer of the present invention.

Fig. 5 is a schematic view showing a method of manufacturing the liquid crystal display panel of the present invention.

S101～S105. . . Process step

Claims (9)

A method for manufacturing a liquid crystal display panel, comprising the steps of: providing a first substrate, wherein the first substrate is provided with an edge frame, the edge frame system defines an image display area; and at least one injection valve is provided for liquid crystal spraying operation, The injection valve accurately and quantitatively applies a liquid crystal material to the image display area at a high speed and a small amount, wherein the liquid crystal material forms a plurality of liquid crystal dots; and provides a second substrate for performing a pressing step, the second substrate Pressing the first substrate, and applying a vacuum between the first substrate and the second substrate to uniformly and continuously disperse the liquid crystal dots in the image display region to form a liquid crystal layer, the liquid crystal layer The height is substantially the same as the height of the edge frame. The method of manufacturing a liquid crystal display panel according to claim 1, wherein in the step of providing at least one injection valve for performing a liquid crystal spraying operation, the dispensing valve has a dispensing speed of 150 to 200 dots/second. The method for manufacturing a liquid crystal display panel according to claim 1, wherein in the step of providing at least one injection valve for performing a liquid crystal spraying operation, each of the liquid crystal dots has a weight of 0.008 mg and an error of 1% or less. The method of manufacturing a liquid crystal display panel according to claim 1, wherein in the step of providing at least one injection valve for performing a liquid crystal spraying operation, a plurality of the injection valves are arranged in a plurality of rows to perform This liquid crystal spraying operation. The method of manufacturing a liquid crystal display panel according to claim 1, wherein in the step of providing at least one injection valve for performing a liquid crystal spraying operation, the injection valve further has a constant temperature heating device for controlling the liquid crystal material to have a predetermined Viscosity coefficient. The method of manufacturing a liquid crystal display panel according to claim 1, wherein in the step of providing at least one injection valve for performing a liquid crystal spraying operation, the injection valve non-contactly forms the liquid crystal material into the liquid crystal dots. And applied to the image display area. The method for manufacturing a liquid crystal display panel according to claim 1, wherein in the step of providing at least one injection valve for performing a liquid crystal spraying operation, the injection valve has a body having a storage tank and a glue line therein. And a nozzle, and a piston system is displaced up and down in the dispensing line. The method of manufacturing a liquid crystal display panel according to claim 1, wherein in the step of providing at least one injection valve for performing a liquid crystal spraying operation, the injection valve is precisely displaced and quantitatively positions the liquid crystal material at a fixed pitch. Applied to the image display area. The method of manufacturing a liquid crystal display panel according to claim 1, wherein the edge frame prevents the liquid crystal material from flowing out.