KR20060094434A - 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 that can improve the yield.

The present invention comprises a first substrate; A black matrix partitioning an area on which the R, G, and B color filters for forming a color image are to be formed on the first substrate; And an adhesion-promoting photoresist layer formed between the first substrate and the black matrix to correspond to a region where the black matrix is to be formed to promote adhesion between the first substrate and the black matrix.

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY AND FABRICATING METHOD THEREOF}

1 is a cross-sectional view partially showing a conventional TN mode liquid crystal display device;

2 is a cross-sectional view for explaining a defect due to the separation of the black matrix from the substrate.

3 is a cross-sectional view illustrating an outermost region of an upper substrate of an IPS mode LCD.

4 is a cross-sectional view partially illustrating an LCD according to a first exemplary embodiment of the present invention.

5A through 5C are cross-sectional views illustrating a method of forming an adhesion promoting photoresist layer and a black matrix according to a first embodiment of the present invention.

6 is a cross-sectional view partially illustrating an LCD according to a second exemplary embodiment of the present invention.

7A to 7C are cross-sectional views illustrating a method of forming an upper substrate and a black matrix according to a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

2, 102: upper substrate 4, 104: black matrix

6, 106: color filter 7: sealant

15 planarization layer 18,118 common electrode

103: adhesion promoting photoresist layer 112: surface bonder

52, 152: liquid crystal

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a method of manufacturing the same that can improve the yield.

In general, a liquid crystal display (LCD) displays an image by adjusting the light transmittance of the liquid crystal according to a video signal. To this end, the liquid crystal display includes a liquid crystal display panel in which liquid crystal cells are arranged in a matrix, and a driving circuit for driving the liquid crystal display panel.

The liquid crystal display is roughly classified into a twisted nematic (TN) mode using a vertical electric field and an in plan switch (IPS) mode using a horizontal electric field according to the electric field driving the liquid crystal.

The TN mode is a mode in which a liquid crystal is driven by a vertical electric field between a pixel electrode and a common electrode disposed opposite the upper substrate, and has a large aperture ratio, but a narrow viewing angle. On the other hand, the IPS mode is a mode for driving the liquid crystal by a horizontal electric field between the pixel electrode and the common electrode disposed side by side on the lower substrate has a large viewing angle has a disadvantage of small aperture ratio.

1 is a cross-sectional view partially illustrating a conventional TN mode liquid crystal display device.

Referring to FIG. 1, a TN mode liquid crystal display device includes a black matrix 4, a color filter 6, a common electrode 18, a pattern spacer 13, and an upper alignment layer 8 sequentially formed on an upper substrate 2. ) An upper array substrate (or color filter array substrate), a TFT formed on the lower substrate 32, a lower array substrate composed of a pixel electrode 16 and a lower alignment layer 38, an upper array substrate, and The liquid crystal 52 is injected into the internal space between the lower array substrates.

On the other hand, in the IPS mode liquid crystal display, the common electrode 18 is formed on the lower substrate 32 and the flattening layer (1) is used to compensate for the step difference of the color filter 6 on the color filter 6 on the upper substrate 2. Not shown) is formed.

In the upper array substrate, the black matrix 4 is formed on the upper substrate 2 in correspondence with the TFT region of the lower array substrate and the region of the gate lines and data lines not shown, and the color filter 6 is formed. Prepare the cell area to be. The black matrix 4 prevents light leakage and absorbs external light to increase contrast. The color filter 6 is formed over the cell region separated by the black matrix 4 and the black matrix 4. The color filter 6 is formed for each of R, G, and B to implement R, G, and B colors. The common electrode 18 is supplied with a common voltage for controlling the movement of the liquid crystal. The pattern spacer 13 serves to maintain a cell gap between the upper array substrate and the lower array substrate.

In the lower array substrate, the TFT includes a gate electrode 9 formed on the lower substrate 32 together with a gate line, and a semiconductor layer 14 overlapping the gate electrode 9 and the gate insulating film 44 therebetween. 42 and source / drain electrodes 40 and 47 formed together with data lines (not shown) with semiconductor layers 14 and 42 therebetween. This TFT supplies the pixel signal from the data line to the pixel electrode 16 in response to the scan signal from the gate line. The pixel electrode 16 is a transparent conductive material having a high light transmittance and is in contact with the drain electrode 47 of the TFT with the passivation layer 50 interposed therebetween. The upper and lower alignment layers 8 and 38 for liquid crystal alignment are formed by applying an alignment material such as polyimide and then performing a rubbing process.

However, the black matrix 4 formed on the upper substrate 2 of the liquid crystal display panel has a disadvantage in that adhesive strength with the upper substrate 2 is not good due to the characteristics of the material. As a result, the black matrix 4 is easily spaced apart from the upper substrate 2 by an external impact, and the liquid crystal injected between the upper array substrate and the lower array substrate because the black matrix 4 is spaced apart from the upper substrate 2. As shown in FIG. 2, there is a problem that the orientation is disturbed by the pressure by the spaced black matrix 4. As such, the liquid crystal display panel in which the liquid crystal alignment is disturbed is determined to be defective, which causes a decrease in the yield of the liquid crystal display panel.

In addition, the problem that the black matrix 4 is spaced apart from the upper substrate 2 is more common than that in the TN mode liquid crystal display device having the common electrode 18 on the upper substrate 2. In the case of the IPS mode liquid crystal display panel formed on the lower substrate 32 and having a flattening layer on the upper substrate 2 for compensating for the level difference of the color filter 6, it is more frequent. In particular, the problem that the black matrix 4 is spaced apart from the upper substrate 2 of the IPS mode liquid crystal display device frequently occurs in the outermost region of the IPS mode liquid crystal display device.

3 is a cross-sectional view illustrating an outermost region of an upper substrate of an IPS mode LCD.

Referring to FIG. 3, the IPS mode liquid crystal display includes a planarization layer for forming a common electrode (not shown) on the lower substrate 32 and compensating for the step of the color filter 6 on the upper substrate 2. 15) is formed. At this time, the adhesive force between the upper substrate 2 and the black matrix 4 has a property that is worse than that between the planarization layer 15 and the sealant 7 used when the upper array substrate and the lower array substrate are bonded together.

Accordingly, when an impact is applied from the outside, the contact surface of the upper substrate 2 and the black matrix 4 is impacted simultaneously with the contact surface of the planarization layer 15 and the sealant 7 by the external impact. The contact surface between the substrate 2 and the black matrix 4 receives not only an impact applied from the outside but also an impact received by the contact surface of the planarization layer 15 and the sealant 7. ) Are more easily spaced apart.

The separation of the black matrix 4 from the upper substrate 2 disturbs the alignment of the liquid crystal in the region except for the outermost region of the liquid crystal display panel. As a result, the sealant 7 is spaced apart from the upper substrate 2, and even a defect in which the liquid crystal is counted into the spaced space of the sealant 7 is generated. Accordingly, there is a demand for a method for preventing the black matrix 4 from being spaced apart from the upper substrate 2.

Accordingly, an object of the present invention is to provide a liquid crystal display device and a method of manufacturing the same that can improve the yield.

In order to achieve the above object, the liquid crystal display device according to an embodiment of the present invention comprises a first substrate; A black matrix partitioning an area on which the R, G, and B color filters for forming a color image are to be formed on the first substrate; And an adhesion-promoting photoresist layer formed between the first substrate and the black matrix to correspond to a region where the black matrix is to be formed to promote adhesion between the first substrate and the black matrix.

The liquid crystal display device comprises: a second substrate facing the first substrate; Liquid crystal injected between the first substrate and the second substrate; A planarization layer for compensating for the steps of the R, G, and B color filters on the first substrate; A common electrode is further provided on the second substrate to supply a common voltage to the liquid crystal.

The liquid crystal display device comprises: a second substrate facing the first substrate; Liquid crystal injected between the first substrate and the second substrate; A common electrode is further provided on the first substrate to supply a common voltage to the liquid crystal.

The adhesion promoting photoresist layer includes HMDS (Hexamethyldisiloxan) photoresist.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes: a first substrate having surface energy increased and surface couplers increased through plasma processing; A black matrix may be formed on the first substrate to partition a region where R, G, and B color filters for forming a color image are to be formed.

The liquid crystal display device comprises: a second substrate facing the first substrate; Liquid crystal injected between the first substrate and the second substrate; A planarization layer for compensating for the steps of the R, G, and B color filters on the first substrate; A common electrode is further provided on the second substrate to supply a common voltage to the liquid crystal.

The liquid crystal display device comprises: a second substrate facing the first substrate; Liquid crystal injected between the first substrate and the second substrate; A common electrode is further provided on the first substrate to supply a common voltage to the liquid crystal.

A method of manufacturing a liquid crystal display according to an exemplary embodiment of the present invention provides a method of manufacturing a liquid crystal display device comprising a black matrix partitioning a region where an R, G, and B color filter for forming a color image is to be formed, and the first substrate and the black matrix. Forming an adhesion promoting photoresist layer that promotes adhesion using the same mask.

The adhesion promoting photoresist includes a Hexamethyldisiloxan (HMDS) photoresist.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, comprising: preparing a first substrate having surface energy increased and surface couplers increased through plasma treatment; And forming a black matrix on the first substrate, the black matrix dividing an area in which R, G, and B color filters for forming a color image are to be formed.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4 to 7C.

4 is a cross-sectional view partially illustrating a liquid crystal display according to a first exemplary embodiment of the present invention.

Referring to FIG. 4, in the TN mode liquid crystal display according to the first exemplary embodiment of the present invention, the contact enhancement photoresist layer 103, the black matrix 104, and the color filter 106 sequentially formed on the upper substrate 102. ), A common electrode 118, a pattern spacer 113, and an upper alignment layer 108, an upper array substrate (or color filter array substrate), a TFT formed on the lower substrate 132, and a pixel electrode 116. And a lower array substrate composed of a lower alignment layer 138, and a liquid crystal 152 injected into an internal space between the upper array substrate and the lower array substrate.

Meanwhile, in the IPS mode liquid crystal display, the common electrode 118 is formed on the lower substrate 132 and the planarization layer (compensation step) of the color filter 106 on the color filter 106 on the upper substrate 102 is performed. Not shown) is formed.

In the upper array substrate, the contact enhancement photoresist layer 103 is formed between the upper substrate 102 and the black matrix 104 in a region corresponding to the black matrix 104, and is formed by using a material having excellent adhesion. The adhesion between the upper substrate 102 and the black matrix 104 is enhanced.

The contact enhancement photoresist layer 103 includes HMDS photoresist having excellent adhesion, and may be any photoresist having excellent adhesion.

The black matrix 104 is formed on the upper substrate 102 to correspond to the TFT region of the lower array substrate and the gate line and data line regions (not shown), and provides a cell region in which the color filter 106 is to be formed. . The black matrix 104 prevents light leakage and absorbs external light to increase contrast. The color filter 106 is formed over the cell region and the black matrix 104 separated by the black matrix 104. The color filter 106 is formed for each of R, G, and B to implement R, G, and B colors. The common electrode 118 is supplied with a common voltage for controlling the movement of the liquid crystal. The pattern spacer 113 serves to maintain a cell gap between the upper array substrate and the lower array substrate.

In the lower array substrate, the TFT includes a gate electrode 109 formed on the lower substrate 132 together with a gate line, and a semiconductor layer 114 overlapping the gate electrode 109 and the gate insulating layer 144 therebetween. 142 and source / drain electrodes 140 and 147 formed with data lines (not shown) with semiconductor layers 114 and 142 interposed therebetween. This TFT supplies the pixel signal from the data line to the pixel electrode 116 in response to the scan signal from the gate line. The pixel electrode 116 is a transparent conductive material having a high light transmittance and contacts the drain electrode 147 of the TFT with the passivation layer 150 therebetween. The upper and lower alignment layers 108 and 138 for liquid crystal alignment are formed by applying an alignment material such as polyimide and then performing a rubbing process.

As such, in the liquid crystal display according to the first exemplary embodiment, the black matrix 104 is disposed between the upper substrate 102 and the black matrix 104 in order to enhance the adhesion between the upper substrate 102 and the black matrix 104. Adhesion between the upper substrate 102 and the black matrix 104 is enhanced by forming the adhesion promoting photoresist layer 103 using a photoresist having excellent adhesion in a region corresponding to the?). Accordingly, the upper substrate 102 and the black matrix 104 of the liquid crystal display panel are adhered with high adhesive force, and the black matrix from the upper substrate 102 of the liquid crystal display panel is applied from the case where an impact is applied to the liquid crystal display panel from the outside. It is possible to prevent the 104 from being spaced apart.

Although the liquid crystal display according to the first embodiment of the present invention has been described only with respect to the TN mode liquid crystal display in the description of the adhesion-enhanced photoresist layer with reference to FIG. 4, the liquid crystal display may be easily applied to the IPS mode liquid crystal display.

5A to 5C are cross-sectional views illustrating a method of forming an adhesion promoting photoresist layer and a black matrix according to a first embodiment of the present invention.

Referring to FIG. 5A, the adhesion-enhancing photoresist 103a, the black matrix 104a, and the photoresist 105 for the photolithography process are sequentially coated on the upper substrate 102 and the adhesion-enhancing photo is sequentially The mask 110 having an opening for each region where the resist layer 103 and the black matrix 104 are to be formed is aligned on the upper substrate 102. Then, as shown in FIG. 5B, an adhesion promoting photoresist layer 103 and a black matrix 104 are formed through a photolithography process, and then a photoresist formed on the black matrix 104 through a strip process. By removing the pattern 105a, the adhesion promoting photoresist 103 and the black matrix 104 are completed as shown in FIG. 5C.

Through the above method, the adhesion enhancing photoresist layer 103 is formed between the upper substrate 102 and the black matrix 104 by using a photoresist having excellent adhesion in a region corresponding to the black matrix 104. The adhesion of the 102 and the black matrix 104 is enhanced. Accordingly, the upper substrate 102 and the black matrix 104 of the liquid crystal display panel are adhered with high adhesive force, and the black matrix 104 is spaced apart from the upper substrate 102 when an impact is applied to the liquid crystal display panel from the outside. Can be prevented.

6 is a cross-sectional view partially illustrating a liquid crystal display according to a second exemplary embodiment of the present invention.

Hereinafter, descriptions of the same parts as those in the first embodiment of the present invention will be omitted in the description related to the second embodiment of the present invention.

Referring to FIG. 6, the TN mode liquid crystal display according to the second exemplary embodiment of the present invention includes an upper substrate 102 having increased surface energy through plasma treatment and increased surface couplers 112. As energy increases, the surface combiners 112 form a black matrix 104 on the increased upper substrate 102.

As described above, the liquid crystal display according to the second exemplary embodiment of the present invention uses a plasma treatment on the upper substrate 102 to improve adhesion between the upper substrate 102 and the black matrix 104. The adhesion of the upper substrate 102 and the black matrix 104 is enhanced by increasing the surface energy and increasing the surface couplers 112 on the surface of the upper substrate 102. Accordingly, the upper substrate 102 and the black matrix 104 of the liquid crystal display panel are adhered with high adhesive force, and the black matrix from the upper substrate 102 of the liquid crystal display panel is applied from the case where an impact is applied to the liquid crystal display panel from the outside. It is possible to prevent the 104 from being spaced apart.

The liquid crystal display according to the second embodiment of the present invention, in which the surface energy through the plasma treatment is increased with reference to FIG. 6 and the black matrix is formed on the upper substrate having the increased surface couplers, is described only for the TN mode liquid crystal display. The present invention can be easily applied to an IPS mode liquid crystal display.

7A through 7C are cross-sectional views illustrating a method of forming an upper substrate and a black matrix according to a second embodiment of the present invention.

Referring to FIG. 7A, the plasma discharge gas including the Ar gas capable of generating the plasma discharge and the surface of the upper substrate 102 by performing plasma discharge in a chamber (not shown) into which the upper substrate 102 is injected. In addition to increasing energy, the surface couplers 112 on the upper substrate 102 surface are increased. Then, as shown in FIG. 7B, the black matrix 104a and the photoresist 105 for the photolithography process are sequentially formed on the upper substrate 102 where the surface energy is increased and the surface couplers 112 are increased. Then, the mask 110 having the front surface coating and openings for each region where the black matrix 104 is to be formed is aligned on the upper substrate 102. Thereafter, the black matrix 104 is completed as shown in FIG. 7C by performing the photolithography process and the strip process including the exposure and development processes.

 Through this method, the upper substrate 102 may be increased by increasing the surface energy of the upper substrate 102 through plasma treatment on the upper substrate 102 and increasing the surface couplers 112 on the surface of the upper substrate 102. And adhesion of the black matrix 104 is enhanced. Accordingly, the upper substrate 102 and the black matrix 104 of the liquid crystal display panel are adhered with high adhesive force, and the black matrix 104 is spaced apart from the upper substrate 102 when an impact is applied to the liquid crystal display panel from the outside. Can be prevented.

As described above, the liquid crystal display according to the present invention and a method of manufacturing the same by using a photoresist excellent in adhesion to the area corresponding to the black matrix between the upper substrate and the black matrix in order to improve the adhesion between the upper substrate and the black matrix. By forming the adhesion promoting photoresist layer, the adhesion between the upper substrate and the black matrix is enhanced. Accordingly, the upper substrate and the black matrix of the liquid crystal display panel are adhered with high adhesive force, and when the impact is applied to the liquid crystal display panel from the outside, the black matrix may be prevented from being spaced apart from the upper substrate.

In addition, the liquid crystal display according to the present invention and a method of manufacturing the same increase the surface energy of the upper substrate through the plasma treatment on the upper substrate in order to improve the adhesion between the upper substrate and the black matrix and the surface coupler of the upper substrate surface Increasing the adhesion of the upper substrate to the black matrix is enhanced. Accordingly, the upper substrate and the black matrix of the liquid crystal display panel are adhered with high adhesive force, and when the impact is applied to the liquid crystal display panel from the outside, the black matrix may be prevented from being spaced apart from the upper substrate.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (10)

A first substrate; A black matrix partitioning an area on which the R, G, and B color filters for forming a color image are to be formed on the first substrate; And an adhesion-promoting photoresist layer formed between the first substrate and the black matrix and corresponding to a region where the black matrix is to be formed to promote adhesion between the first substrate and the black matrix. Display. The method of claim 1, A second substrate facing the first substrate; Liquid crystal injected between the first substrate and the second substrate; A planarization layer for compensating for the steps of the R, G, and B color filters on the first substrate; And a common electrode for supplying a common voltage to the liquid crystal on the second substrate. The method of claim 1, A second substrate facing the first substrate; Liquid crystal injected between the first substrate and the second substrate; And a common electrode for supplying a common voltage to the liquid crystal on the first substrate. The method of claim 1, The adhesion promoting photoresist layer is a liquid crystal display comprising HMDS (Hexamethyldisiloxan) photoresist. A first substrate having increased surface energy and surface couplers through plasma treatment; And a black matrix partitioning a region on which the R, G, and B color filters for forming a color image are to be formed on the first substrate. The method of claim 5, wherein A second substrate facing the first substrate; Liquid crystal injected between the first substrate and the second substrate; A planarization layer for compensating for the steps of the R, G, and B color filters on the first substrate; And a common electrode for supplying a common voltage to the liquid crystal on the second substrate. The method of claim 5, wherein A second substrate facing the first substrate; Liquid crystal injected between the first substrate and the second substrate; And a common electrode for supplying a common voltage to the liquid crystal on the first substrate. The same mask is used as the black matrix for partitioning the region where the R, G, and B color filters for forming a color image on the first substrate and the adhesion promoting photoresist layer for promoting adhesion between the first substrate and the black matrix. Method for manufacturing a liquid crystal display device comprising the step of forming by. The method of claim 8, The adhesion promoting photoresist is a manufacturing method of a liquid crystal display device comprising a Hexamethyldisiloxan (HMDS) photoresist. Providing a first substrate having increased surface energy and increased surface couplers through plasma treatment; And forming a black matrix on the first substrate, the black matrix dividing an area in which R, G, and B color filters are to be formed.

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