KR19990058637A - LCD and its manufacturing method - Google Patents

Abstract

The present invention relates to a liquid crystal display device and a method of manufacturing the same, and a sealing material for bonding and sealing the upper and lower substrates, the liquid crystal injected between the upper and lower substrates, the upper and lower substrates, and the upper and lower substrates. First and second grooves each having a predetermined depth, and first and second polarizing plates embedded in and attached to the first and second grooves, and injecting liquid crystal between the upper and lower substrates, Sealing, applying a photoresist to the outer surfaces of the upper and lower substrates, and then exposing and developing to expose a predetermined polarization region in the center of the upper and lower substrates, and using the photoresist as a mask. Etching the exposed portions of the upper and lower substrates to a predetermined depth to form first and second grooves, removing the photoresist, and And embedding and attaching the first and second polarizing plates in the first and second grooves. Accordingly, since the first and second polarizing plates are embedded in and attached to the first and second grooves, the thickness of the sum of the upper and lower substrates does not increase by the thickness of the sum of the first and the second polarizing plates, resulting in a thinner and lighter LCD. In addition, since the surface of the upper and lower substrates are flat, unevenness does not occur.

Description

LCD and its manufacturing method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a method for manufacturing the same. In particular, a liquid crystal display device which is easy to thin and light by etching the polarization regions of the upper and lower substrates bonded together after sealing and filling a polarizing plate in the etched portion. It relates to a manufacturing method.

In general, a liquid crystal display device has a matrix structure in which a substrate having pixel electrodes and switching elements and an upper and lower substrates having a color filter and a common electrode arranged to reproduce colors are bonded to each other, and then liquid crystal is injected between the two substrates. When the electric field is applied from the outside by sealing, the liquid crystal moves according to the electric field and the image is displayed by the light passing through the substrate.

The liquid crystal display device can form a thin upper and lower substrate to achieve a thinner and lighter weight. In general, a liquid crystal display device has been proposed to form a thin film by bonding the upper and lower substrates and then chemically etching the surface for thinner and lighter weight.

1 is a cross-sectional view of a liquid crystal display device according to the prior art.

In the liquid crystal display according to the related art, the upper and lower substrates 11 and 13 and the sealing material 15 for attaching and sealing the upper and lower substrates 11 and 13, and the upper and lower substrates 11 and 13, respectively. Liquid crystals 17 filled between and varying in light transmission characteristics according to an electric field, and first and second polarizing plates 18 and 19 attached to outer surfaces of upper and lower substrates 11 and 13 to polarize light. Is made of.

In the liquid crystal display device having the above-described structure, the liquid crystal 17 is injected between the upper and lower substrates 11 and 13 and then sealed by the sealing material 15. The first and second polarizing plates 18 and 19 are attached to the exposed surfaces of the upper and lower substrates 11 and 13.

However, the above-described conventional liquid crystal display device attaches the first and second polarizing plates to the surfaces of the upper and lower substrates, so that the thickness of the first and second polarizing plates is increased, so that the thickness of the first and second polarizing plates is not only thin and difficult, but also the weight of the upper and lower substrates is increased. There was a problem that irregularities occurred on the surface of the substrate.

Accordingly, an object of the present invention is to provide a liquid crystal display device having a first and second polarizing plates attached to grooves formed on the upper and lower substrate surfaces, to reduce thickness and reduce weight, and to have unevenness on the upper and lower substrate surfaces, and a manufacturing method thereof. In providing.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes an upper and lower substrate, a liquid crystal injected between the upper and lower substrates, a sealing material for bonding and sealing the upper and lower substrates, and the upper and lower substrates. First and second grooves each having a predetermined depth, and first and second polarizing plates embedded in and attached to the first and second grooves.

The manufacturing method of the liquid crystal display device according to the present invention for achieving the above object is a process of injecting a liquid crystal between the upper and lower substrates, bonding and sealing with a sealing material, and applying a photoresist to the outer surface of the upper and lower substrates Post-exposure and development to expose a predetermined polarization region in the center portion of the upper and lower substrates; and using the photoresist as a mask to etch the exposed portions of the upper and lower substrates by a predetermined depth to first and second And forming a groove, and removing the photoresist and embedding and attaching first and second polarizing plates in the first and second grooves.

1 is a cross-sectional view of an LCD according to the related art.

2 is a cross-sectional view of a liquid crystal display according to the present invention.

3A to 3B are manufacturing process diagrams of the liquid crystal display device according to the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

2 is a cross-sectional view of a liquid crystal display device according to the present invention.

In the liquid crystal display according to the present invention, the liquid crystal 27 is injected between the upper and lower substrates 21 and 23 having a thickness of t, respectively, and bonded and sealed with the sealing material 25.

The upper substrate 21 is a color filter (not shown) is formed, the lower substrate 23 is a thin film transistor (not shown) is formed, the upper and lower substrates 21, 23 are etched in a predetermined portion And the first and second grooves 31 and 33 having a depth d are formed, and the first and second polarizing plates 35 and 37 are attached to the first and second grooves 31 and 33. .

In the above-described upper and lower substrates 21 and 23 having a thickness t, respectively, the thicknesses of the portions in which the first and second grooves 31 and 33 are formed are reduced to t-d, respectively. Therefore, the portions in which the first and second grooves 31 and 33 of the upper and lower substrates 21 and 23 are formed are reduced in thickness from 2 t to 2 (t-d). The first and second polarizing plates 35 and 37 each having a thickness d are attached to the first and second grooves 31 and 33.

As described above, the first and second grooves 31 and 33 having a depth d are formed in the upper and lower substrates 21 and 23 having a thickness of t, respectively, and the thickness is reduced to td. Since the first and second polarizing plates 35 and 37 each having a thickness d are embedded in and attached to the first and second grooves 31 and 33, the thickness of the first and second grooves 31 and 33 can be easily reduced and the weight can be reduced. have. In addition, since the surfaces of the upper and lower substrates 35 and 37 and the surfaces of the first and second polarizing plates 35 and 37 are flat, unevenness does not occur.

3A to 3B are manufacturing process diagrams of the liquid crystal display device according to the present invention.

Referring to FIG. 3A, the liquid crystal 27 is injected between the upper and lower substrates 21 and 23 having a thickness of t, respectively, and bonded and sealed with the sealing material 25. The upper substrate 21 is a color filter (not shown) is formed, the lower substrate 23 is a thin film transistor (not shown) is formed.

The photoresist 29 is applied to the outer surfaces of the upper and lower substrates 21 and 23, and then exposed and developed to expose the polarization region in the center portion. The exposed portions of the upper and lower substrates 21 and 23 are etched by a predetermined depth d with an etching solution such as hydrofluoric acid (HF) to form the first and second grooves 31 and 33.

The thickness of the upper and lower substrates 21 and 23 may be etched with an etching solution such as hydrofluoric acid (HF) before the first and second grooves 31 and 33 are formed.

Referring to FIG. 3B, the photoresist 29 is removed. Then, the first and second polarizing plates 35 and 37 having a predetermined thickness d are embedded in the first and second grooves 31 and 33. Therefore, the thickness of the sum of the upper and lower substrates 21 and 23 is not increased by 2d, the thickness of the sum of the first and second polarizing plates 35 and 37, and becomes 2t, which is the initial thickness. Also, since the first and second polarizing plates 35 and 37 are embedded in and attached to the first and second grooves 31 and 33, the surfaces of the upper and lower substrates 21 and 23 may be formed. As it becomes flat, unevenness does not occur.

Therefore, in the present invention, since the first and second polarizing plates are embedded in and attached to the first and second grooves, the thickness of the sum of the upper and lower substrates does not increase by the thickness of the sum of the first and second polarizing plates, thereby reducing the thickness of the liquid crystal display device and Light weight can be achieved, and also, since the surface of the upper and lower substrates are flat, there is an advantage that irregularities do not occur.

Claims (4)

Upper and lower substrates, A liquid crystal injected between the upper and lower substrates, A sealing material for bonding and sealing the upper and lower substrates; First and second grooves each having a predetermined depth in each of the upper and lower substrates; And first and second polarizing plates embedded in and attached to the first and second grooves. The liquid crystal display of claim 1, wherein the first and second polarizing plates are formed to have the same thickness as that of the first and second grooves. Injecting liquid crystal between the upper and lower substrates, bonding and sealing with a sealing material, Applying a photoresist to the outer surfaces of the upper and lower substrates, and then exposing and developing the photoresist to expose predetermined polarization regions in the center of the upper and lower substrates; Etching the exposed portions of the upper and lower substrates by a predetermined depth using the photoresist as a mask to form first and second grooves; Removing the photoresist and embedding and attaching first and second polarizing plates into the first and second grooves. The method of claim 3, further comprising etching the outer surfaces of the upper and lower substrates to reduce the thickness after the upper and lower substrates are bonded and sealed.