CN100389355C - Manufacturing method of liquid crystal display panel - Google Patents

Abstract

The present invention relates to a liquid crystal display panel, and proposes a manufacturing method of a liquid crystal display panel, comprising a first transparent substrate and a second transparent substrate, and the first transparent substrate and the second transparent substrate are bonded and fixed by frame glue, wherein The method includes the following steps: first sealing: sealing the gap between the first transparent substrate, the second transparent substrate and the border glue along the edge of the second transparent substrate; liquid crystal pouring: pouring liquid crystal into the first transparent substrate through the liquid crystal injection port In the cavity surrounded by the first transparent substrate, the second transparent substrate and the frame glue; sealing: closing the liquid crystal injection port; edging: polishing the edge of the liquid crystal display panel. In the present invention, before the liquid crystal is poured, the gap formed between the first transparent substrate, the second transparent substrate and the edge of the second transparent substrate outside the frame glue is sealed with silica gel, which solves the problem that the dust generated after edge grinding is mixed in the gap The problem of difficult cleaning in liquid crystals has finally avoided the electrical corrosion of ITO electrodes due to dust.

Description

Manufacturing method of liquid crystal display panel

【Technical field】

The invention relates to a liquid crystal display panel, in particular to a manufacturing process flow of the liquid crystal display panel.

【Background technique】

ITO (indium tin oxide) transparent electrodes are an important part of liquid crystal display panels. ITO electrode corrosion is also a relatively important problem in the manufacture of liquid crystal display panels. ITO electrode corrosion will not only cause liquid crystal display panels or liquid crystal displays (LCDs) to be scrapped, And because it will gradually become serious over time, reliability problems may occur after LCDs are sold to users, leading to market complaints. After doing a lot of analysis, it was found that the ITO electrode corrosion is related to the manufacturing process of the liquid crystal display panel. The manufacturing process of the existing liquid crystal display panel is: liquid crystal pouring-sealing-edge grinding-cleaning-IC bonding-silica gel sealing. The problem with this process is: because the liquid crystal infusion relies on the principle of siphon phenomenon, after the two substrate glasses are bonded by the frame glue, there is a gap between the two substrate glasses and outside the frame glue, as shown in Figure 1, label 5 As shown, the number 2 represents the frame glue. When the liquid crystal is poured, the liquid crystal will remain in the gap through the siphon phenomenon, and the dust generated after edging will be mixed in the liquid crystal remaining in the gap, which is difficult to clean. The dust will undergo electrochemical reactions over time. Lead to product ITO electrode corrosion.

【Content of invention】

The main purpose of the present invention is to provide a manufacturing process flow of liquid crystal display panels in order to solve the problems of the existing process flow, so as to prevent the dust generated after edging from causing corrosion of ITO electrodes.

In order to achieve the above object, the method for manufacturing a liquid crystal display panel proposed by the present invention includes a first transparent substrate and a second transparent substrate, and the first transparent substrate and the second transparent substrate are bonded and fixed by frame glue, which also includes the following step:

1) First sealing: seal the gap between the first transparent substrate, the second transparent substrate and the outside of the frame glue along the edge of the second transparent substrate;

2) Liquid crystal filling: pouring liquid crystal into the cavity surrounded by the first transparent substrate, the second transparent substrate and the frame glue through the liquid crystal injection port;

3) Sealing: sealing the liquid crystal injection port.

The sealing described in step 1) is to use a sealant to seal the gap between the first transparent substrate, the second transparent substrate and the edge of the second transparent substrate outside the frame glue.

Use silicone as a sealant.

The gap described in step 1) refers to the gap surrounded by the first transparent substrate, the second transparent substrate, and the edge of the second transparent substrate outside the frame glue with the ITO electrodes extending out of one or more sides of the frame glue.

The beneficial effects of the present invention are: 1) before the technical process of liquid crystal pouring and edging, the gap between the first transparent substrate, the second transparent substrate and the outside of the frame glue along the edge of the second transparent substrate is sealed to avoid During the liquid crystal pouring process, the liquid crystal remains in the gap through the siphon phenomenon, thereby preventing the dust generated after edging from being mixed in the liquid crystal remaining in the gap, and finally avoiding the electrical corrosion of the ITO electrode due to dust. 2) Use silica gel as a sealant, which is easy to use and low in cost. 3) Only seal the first transparent substrate on one or more sides of the ITO electrode extending out of the frame glue, the gap between the second transparent substrate and the edge of the second transparent substrate outside the frame glue, and seal the ITO electrodes on the other sides It does not extend beyond the frame glue, so it is blocked by the frame glue, so it is not necessary to seal it before the liquid crystal is poured, which not only improves work efficiency but also reduces costs.

The features and advantages of the present invention will be described in detail with reference to the accompanying drawings.

【Description of drawings】

Fig. 1 shows the right view schematic diagram before the liquid crystal display panel of the present invention is sealed for the first time;

Fig. 2 shows the schematic diagram of the front structure of the liquid crystal display panel of the present invention after it is sealed for the first time;

Fig. 3 represents the flowchart of an embodiment of the present invention;

Fig. 4 shows the schematic diagram of the front structure of the liquid crystal display panel after sealing for the first time in another embodiment of the present invention;

Fig. 5 shows the right view schematic diagram of Fig. 4;

Fig. 6 is a schematic right side view of a liquid crystal display panel according to another embodiment of the present invention after sealing for the second time.

【Detailed ways】

Specific embodiment one, as shown in Figure 1, 2, on the first transparent substrate 3 and the second transparent substrate 4, be made with ITO transparent electrode 10 respectively, the ITO transparent electrode 10 on the two substrates forms voltage according to the added signal, The liquid crystal is deflected under the action of voltage. The first transparent substrate 3 and the second transparent substrate 4 are equal in length, but the width of the second transparent substrate 4 is smaller than the width of the first transparent substrate 3, and the edges of the first transparent substrate 3 and the second transparent substrate 4 are fixed on the edge by the frame glue Together, there is a gap 5 along the edge of the second transparent substrate 4 between the two substrates, besides the frame glue 2, a liquid crystal injection port 6 for filling liquid crystal is left on one side of the two substrates, and a cavity for filling liquid crystal is in the middle of the two substrates 7. The liquid crystal enters the cavity 7 from the liquid crystal injection port 6 through the siphon phenomenon. In order to prevent the liquid crystal from entering the gap 5 through the siphon phenomenon, in this embodiment, before the liquid crystal infusion process, firstly, the space between the first transparent substrate 3 and the second transparent substrate 4 and the outside of the frame glue 2 along the edge of the second transparent substrate 4 are surrounded. The gap 5 is sealed, and its technological process is as shown in Figure 3:

1) First sealing: seal the gap between the first transparent substrate, the second transparent substrate and the outside of the frame glue along the edge of the second transparent substrate;

2) Liquid crystal filling: pouring liquid crystal into the cavity surrounded by the first transparent substrate, the second transparent substrate and the frame glue through the liquid crystal injection port;

3) Sealing: closing the liquid crystal injection port;

4) Edging: Grinding the edge of the LCD panel.

5) cleaning;

6) IC bonding: the IC is electrically connected and fixed on the ITO electrode extending out of the frame glue;

7) The second sealing: seal the ITO electrodes extending out of the frame glue and the bonded IC with silicone.

The sealing in step 1) refers to sealing the gap between the first transparent substrate and the second transparent substrate and the edge of the second transparent substrate outside the frame glue with a sealant. The sealant is preferably silica gel, and can also be other sealants.

Other ways can also be used to seal the gap formed between the first transparent substrate and the second transparent substrate and outside the frame glue along the edge of the second transparent substrate, such as using a sealing strip or a sealing plug.

The first transparent substrate 3 and the second transparent substrate 4 are preferably glass, and may also be other transparent substrates.

Embodiment 2. Since the ITO electrodes can only extend to one side (one direction) of the first transparent substrate 3 beyond the frame glue to the edge of the first transparent substrate 3 , the ITO electrodes 10 in other directions are all inside the frame glue. Therefore, the difference between this embodiment and the first embodiment is that the first sealing is only performed in one direction in which the ITO electrode 10 extends to the edge of the substrate, as shown in Figure 4, because the width of the second transparent substrate 4 is smaller than that of the first transparent substrate 4 The width of the transparent substrate 3, the ITO electrode 10 extends from the direction in which the edges of the two substrates are staggered to the edge of the first transparent substrate 3, and silicone or other sealant is applied between the second transparent substrate 4, the first transparent substrate 3 and the frame glue A sealing strip 8 is formed in the gap surrounded by the outer edge of the second transparent substrate 4 . The ITO electrode extending out of the frame glue and the bonded IC are sealed for the second time to form a sealing tape 9 to completely isolate the ITO electrode 10 from the outside world.

Of course, if the ITO electrode 10 extends beyond the frame glue in two directions and extends to the edges in the two directions, it is necessary to apply silicone or other sealants in the gaps in the two directions.

Compared with the first embodiment, the second embodiment improves the work efficiency and reduces the cost.

In a word, the present invention reduces the probability of ITO electrode corrosion without increasing too much cost.

Claims (4)

1. the manufacture method of LCD panel comprises first transparency carrier and second transparency carrier, and is fixing by the frame adhesive joint between described first transparency carrier and second transparency carrier, it is characterized in that further comprising the steps of:

1) sealing for the first time: with between first transparency carrier, second transparency carrier and the crack sealing that surrounds along the second transparency carrier edge outside the frame adhesive;

2) liquid crystal filling: liquid crystal is filled in the cavity that first transparency carrier, second transparency carrier and frame adhesive surround by liquid crystal injecting port;

3) seal: the sealing liquid crystal injecting port.

2. the manufacture method of LCD panel as claimed in claim 1, it is characterized in that: the described sealing of step 1) is to seal between first transparency carrier, second transparency carrier and the crack that surrounds along the second transparency carrier edge outside the frame adhesive with sealant.

3. the manufacture method of LCD panel as claimed in claim 2 is characterized in that: with silica gel as sealant.

4. as the manufacture method of each described LCD panel in the claim 1 to 3, it is characterized in that: the described crack of step 1) is meant that the ITO electrode extends between one side of frame adhesive or above on one side first transparency carrier, second transparency carrier and the crack that surrounds along the second transparency carrier edge outside the frame adhesive.

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