KR20170080215A - Liquid crystal image display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including a display portion and a non-display portion surrounding the outermost region of the display portion, the display portion including a thin film transistor array substrate and a color filter substrate, Color filter of red, green, and blue, and a first sub-color filter in which red, green, and blue sub-color filters are all stacked in a part of the base substrate, and one or two sub- A color filter including a laminated second region, a fixing portion disposed on the first region and in contact with the thin film transistor array substrate, a first protection portion on the second region, and an insulating portion on one side of the color filter , The thin film transistor array substrate and the color filter substrate in the display portion face each other via a fixing portion, and the non-display portion includes a first substrate, A color filter layer on which at least two of red, green, and blue color filters are laminated on a substrate, a protective layer on the color filter layer, a second substrate facing the first substrate via a support, And a non-display portion surrounding the outermost region, wherein the display portion includes a thin film transistor array substrate provided with a protective film including protrusions and a color filter substrate, wherein the color filter substrate includes a base substrate, A color filter including a first region in which all the sub-color filters of green and blue are stacked and a second region in which one or two sub-color filters selected from the group consisting of red, green and blue sub- A first protective portion on the first region, a first protective portion on the second region, and an insulating portion on one side of the color filter, wherein the thin film transistor Wherein the non-display portion includes a first substrate, a color filter layer on which at least two red, green, and blue color filters are stacked on the first substrate, A protective layer on the filter layer, and a second substrate facing the first substrate via a supporting portion, thereby making it possible to manufacture a small number of masks, simplify the process, and reduce the manufacturing cost.

Description

[0001] LIQUID CRYSTAL IMAGE DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of being manufactured with a small number of masks and simplifying a process, thereby reducing manufacturing costs.

A liquid crystal display device has a structure in which a liquid crystal layer composed of several liquid crystal molecules is interposed between two substrates on which transparent electrodes are formed and then the arrangement of liquid crystal molecules is changed by the electric field generated between the transparent electrodes so that the light transmission amount is controlled Thereby displaying a predetermined image.

In order to improve the screen quality of the liquid crystal display device, the characteristics such as response speed, contrast ratio, viewing angle, and luminance uniformity of the liquid crystal display device are closely related to the thickness of the liquid crystal layer, that is, It is very important to maintain the gap.

Particularly, in the trend toward larger size and higher quality of liquid crystal display devices, maintenance of a uniform cell gap becomes more important, and as a method for maintaining the current cell gap, a column spacer is formed on a color filter substrate as an upper substrate Is known.

In addition, a black matrix was included to prevent light leakage and block light from entering the thin film transistor array substrate, and a separate layer was included for planarization of the upper substrate and the lower substrate.

Therefore, a separate mask is required for the production of the black matrix, the column spacer, and the various planarization layers, and the process is complicated by forming the respective layers individually, thereby increasing the manufacturing cost of the panel. to be.

It is an object of the present invention to provide a liquid crystal display device which can be manufactured with a small number of masks and which simplifies the manufacturing process and reduces manufacturing costs.

A liquid crystal display device according to an embodiment of the present invention includes a display portion and a non-display portion surrounding the outermost region of the display portion. The display unit includes a thin film transistor array substrate and a color filter substrate. The color filter substrate includes a base substrate, a first region in which red, green and blue sub-color filters are all stacked in a part of the base substrate, A blue color sub-color filter, a second region disposed on the first region and in contact with the thin film transistor array substrate, Wherein the color filter substrate includes a first protection portion on the first region, a first protection portion on the second region, and an insulation portion on one side of the color filter, wherein the display portion faces the TFT array substrate and the color filter substrate via a fixing portion, A color filter layer in which at least two of red, green and blue color filters are laminated on a first substrate, a protective layer on the color filter layer, And a second substrate facing the first substrate.

In this case, the thickness of the insulating portion may be thicker than the thickness of the first protective portion.

According to another aspect of the present invention, there is provided a liquid crystal display device including a display and a non-display portion surrounding an outermost region of the display portion, the display portion including a thin film transistor array substrate having a protective film including a protrusion and a color filter substrate The color filter substrate includes a base substrate, a first region in which red, green and blue sub-color filters are all stacked in a part of the base substrate, and a first region in which red, green and blue sub- A color filter including a second region in which two sub color filters are stacked, a fixing portion on the first region, a first protection portion on the second region, and an insulating portion on one side of the color filter, The thin film transistor array substrate and the color filter substrate face each other through the fixing portion and the protruding portion. The non-display portion includes a first substrate, a color filter layer on which at least two red, green and blue color filters are laminated on the first substrate, a protective layer on the color filter layer, and a second Substrate.

At this time, the thickness of the insulating portion may be thicker than the thickness of the fixing portion and the first protection portion.

According to an embodiment of the present invention, the laminated portion of the color filter layer may be formed by stacking two of red, green and blue color filters.

According to an embodiment of the present invention, a part of the laminated portion of the color filter layer may be patterned.

According to an embodiment of the present invention, the height difference between the display portion and the non-display portion may be 0.5 to 1 μm.

Since the liquid crystal display of the present invention can be manufactured with a small number of masks, the manufacturing process is simplified and the cost can be reduced in manufacturing the panel.

Further, the liquid crystal display device of the present invention can prevent the problem of luminance unevenness due to panel deformation.

1 is a cross-sectional view showing a conventional liquid crystal display device.
2 is a sectional view of a liquid crystal display (display portion) according to the first embodiment.
3A to 3D are diagrams schematically showing a manufacturing process of the liquid crystal display device according to the first embodiment.
4 is a cross-sectional view of a liquid crystal display display unit and a non-display unit according to the first embodiment.
5A is a cross-sectional view of a non-display portion of the liquid crystal display device according to the first embodiment, and FIGS. 5B to 5G are schematic views of pattern shapes in the color filter of the non-display portion shown in FIG. 5A.
6 is a cross-sectional view showing a conventional liquid crystal display device.
7 is a cross-sectional view of a liquid crystal display (display portion) according to the second embodiment.
8A to 8F are schematic views illustrating a manufacturing process of the liquid crystal display device according to the second embodiment.

In the description of the embodiments, it is described that each layer, film, electrode, plate or substrate, etc. is formed "on" or "under" of each layer, film, electrode, In this case, "on" and "under " all include being formed either directly or indirectly through another element.

In addition, the criteria for the top, side, or bottom of each component are described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The liquid crystal display according to the first embodiment of the present invention includes a display portion and a non-display portion, and the display portion includes a thin film transistor array substrate and a color filter substrate facing the thin film transistor array substrate through a fixed portion.

The thin film transistor array substrate includes a gate electrode formed on a substrate, an active layer and an ohmic contact layer formed on the gate electrode with a gate insulating layer therebetween, source and drain electrodes formed on the ohmic contact layer, And the pixel electrode connected to the drain electrode. The gate electrode, the semiconductor layer, and the source and drain electrodes constitute a thin film transistor (TFT).

The gate insulating layer may include a silicon nitride layer (SiNx) or a silicon oxide layer (SiOx). The gate insulating layer may be formed of multiple layers such as a silicon nitride layer covering a gate line and a silicon oxide layer formed on the silicon nitride layer as well as a single layer.

The thin film transistor TFT provides a data voltage to the pixel electrode, which is supplied to a data line (not shown) in response to a scan signal supplied to a gate line (not shown). Accordingly, the pixel electrode charges and holds the data voltage for a predetermined time.

The gate electrode is electrically connected to the gate line to supply a scan signal from the gate line. The gate electrode may be a single film made of aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo), chromium (Cr), titanium (Ti), tantalum And the like, but the present invention is not limited to the above examples.

And the source electrode is electrically connected to the data line to supply a data voltage from the data line. The drain electrode is located opposite to the source electrode and the active layer of the semiconductor layer, and is electrically connected to the pixel electrode. And the drain electrode supplies a data voltage from the data line to the pixel electrode. The source and drain electrodes may be formed of a single layer made of aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo), chromium (Cr), titanium (Ti), tantalum Or a combination of these.

The active layer is formed to overlap the gate electrode with the gate insulating film interposed therebetween to form a channel between the source electrode and the drain electrode.

The ohmic contact layer is formed on the active layer for ohmic contact with the source electrode and the drain electrode to reduce electrical contact resistance between each of the source and drain electrodes and the active layer. The active layer and the ohmic contact layer constitute a semiconductor layer.

If necessary, the thin film transistor array substrate may further include other structures known in the art as long as it does not deviate from the object of the present invention.

A color filter substrate according to a first embodiment of the present invention includes a base substrate, a color filter including a first region and a second region in a part of the base substrate, a fixing portion on the first region, A protective portion, and an insulating portion on one side of the color filter.

FIG. 1 illustrates a structure of a conventional liquid crystal display device. Referring to FIG. 1, a color filter substrate included in a conventional liquid crystal display device has a structure in which light leakage is prevented and inversion In order to shield light passing through the domains, black matrices 2 are provided at the boundary of each sub-color filter 3,4,5,6. 3, 4, and 5 color filters are formed on the substrate on which the black matrix 2 is formed. In the case of the RGBW type color filter, the white color filter 6 is filled with a transparent material . An overcoat layer 7 is formed on the black matrix 2 and the color filter for planarization and a column spacer 8 is further provided to secure a cell gap with the thin film transistor array substrate. A color filter substrate was prepared.

In this case, since the respective layers are individually formed as described above, various kinds of masks are required in the manufacturing process, and a lot of steps have been required.

Thus, the present invention provides a laminated structure (at least two types of sub color filter lamination) of red, green, and blue sub-color filters instead of the conventional black matrix and has a white color in the column spacer, the overcoat layer, By simultaneously forming the corresponding portions of the filter, the number of masks required in manufacturing can be reduced and the process steps can be reduced to solve the above-described problems. Therefore, the liquid crystal display device of the present invention is preferably applied to an RGBW color filter.

The base substrate 101 serves to support the color filter substrate, and may be glass or the like, but is not limited thereto.

The color filter according to the first embodiment of the present invention includes red, green, and blue sub-color filters.

2 is a sectional view of a liquid crystal display (display portion) according to the first embodiment. 2, the color filter 100 includes a first region and a second region, where the first region means a region where red, green and blue sub-color filters are all stacked, and the second region Region means a region in which one or two sub color filters are stacked in the group consisting of red, green, and blue sub-color filters.

The first region is provided with a fixing portion 102, the second region is provided with a first protection portion 103, and one side of the color filter 100 is provided with red, An insulating portion 104 is provided in a region where the filter is not disposed.

The fixing portion 102 is disposed in a first region where all red, green, and blue sub-color filters are stacked. The fixing portion 102 maintains a cell gap together with a portion where red, green, and blue sub- The thin film transistor array substrate 109 and the color filter substrate 106 face each other via the fixing portion 102. Accordingly, the liquid crystal display according to the first embodiment of the present invention may not include a column spacer, and the thin film transistor array substrate 109 and the color filter substrate 106, which are opposed to each other by the fixing portion 102, A liquid crystal layer is disposed between the first and second substrates.

The first protection unit 103 is disposed in a second region where one or both sub-color filters of red, green, and blue sub-color filters are stacked, and performs isolation and planarization. The liquid crystal display device according to the first embodiment of the present invention may not include a separate overcoat layer by including the first protective portion 103. [

If necessary, the first region may further include a second protection portion 105 on a side surface of the fixing portion 102. That is, the second protection unit 105 may be provided in a portion of the first region where the fixing unit 102 is not provided, and may have the same function as the first protection unit 103.

According to the first embodiment of the present invention, the insulating portion 104 is included on one side of the color filter 100. [ The insulating portion 104 is disposed on one side of the color filter 100 in an area where the red, green, and blue color filters of the upper portion of the substrate are not disposed. In other words, for the RGBW color filter, it is located in the corresponding part of the white color filter and performs insulation and planarization.

3A to 3D are diagrams for explaining a method of manufacturing the liquid crystal display device according to the first embodiment, and will be described with reference to the following.

First, a red pigment is coated on the base substrate 101, and then selectively exposed and developed to form a red color filter (first sub color filter). Next, green pigment is applied on the upper and side surfaces of the resulting product And then selectively exposes and develops them to form a green color filter (second sub color filter). A blue color filter (a third sub-color filter) is formed by selectively exposing and developing the blue pigment to the upper and side surfaces of the resultant substrate, A color filter is not formed so as to be provided with a color filter (FIG. In the specification and the drawings, red, green, and blue sub-color filters are formed in this order, but the present invention is not limited thereto, and the order is irrelevant. According to the above-described method, a first region in which all of the sub-color filters R, G, and B are stacked, and a second region in which either one of the sub-color filters or two kinds of sub-color filters are stacked is formed.

Subsequently, a resin material 206 is applied on the exposed surfaces of the first through third sub-color filters (Fig. 3B). The resin material 206 must be subjected to a photolithography process including an exposure and development process, as described later. Specifically, the resin material 206 may be a photoactive compound (PAC). If the resin material 206 has a negative characteristic, the portion corresponding to the transmissive portion will not be exposed and only the portion corresponding to the blocking portion and the transflective portion will be exposed. However, when the resin material 206 has a positive characteristic in which light is removed at the time of development, the same result can be obtained by using an exposure mask in which the positions of the blocking portion and the transmissive portion of the mask are changed. In the present invention, a negative type having a characteristic that the light receiving portion of the resin material 206 remains at the time of development will be described as an example.

3C, the fixing portion 102 and the insulating portion 104 are formed on the color filter 100 to which the resin material 206 is applied, ) Mask, and the protective portion is exposed using a half-tone mask.

The mask includes a blocking portion, a transflective portion and a transmissive portion. The blocking portion is a portion for blocking light, the transmitting portion is a portion for passing light, and the semi-transmitting portion is a portion for reducing the intensity of light or transmitting light by reducing the amount of light. At this time, the transflective portion may be formed in a slit shape or may have multiple coating layers.

In the present invention, the mask may include a full-tone mask 207 having a pattern of a transmissive portion for transmitting light and a blocking portion for blocking light, a blocking portion for blocking light, and a pattern of a transflective portion A halftone mask 208 is used.

When using the Fulton mask 207, the resin material 206 is patterned into a single layer having a constant thickness at a portion corresponding to the transmission portion of the Fulton mask 207, and when the halftone mask 208 is used, 206 are patterned into a single layer having a constant thickness at portions corresponding to the transflective portions of the halftone mask 208. [

The fixing portion 102 and the insulating portion 104 may be formed using a full tone mask 207 and the first and second protecting portions 105 may be formed using a halftone mask 208. 3D, the thickness of the fixing portion 102 may be thicker than the thickness of the second protecting portion 105, and the thickness of the insulating portion 104 may be larger than the thickness of the first protecting portion 103, Lt; / RTI >

As described above, the liquid crystal display according to the first embodiment of the present invention has the fixing portion 102, the first and second protecting portions 105, and the insulating portion 104 instead of the column spacer, the overcoat layer, and the white color filter It is possible to reduce the number of masks necessary for manufacturing the liquid crystal display device and reduce the number of process steps by simultaneously forming the fixing portion 102, the first and second protecting portions 105 and 104, The cost is reduced.

4 is a cross-sectional view of a liquid crystal display display unit and a non-display unit according to the first embodiment.

As shown in FIG. 4, according to the first embodiment of the present invention, the non-display portion includes a color filter layer 202 on which at least two of red, green and blue color filters are laminated on a first substrate 201, And a second substrate 205 facing the first substrate 201 via a protective layer 203 and a supporting portion 204 on the first substrate 202. That is, the first embodiment of the present invention replaces the black matrix by applying the sub color filter laminate structure of the display portion to the non-display portion.

The first substrate 201 is an upper substrate of the non-display portion, and the second substrate 205 is a lower substrate.

At this time, the laminated portion of the sub color filter is composed of at least two kinds of color filters among red, green and blue color filters. In this case, since the mask used for forming the color filter of the display portion can be used in the same manner without using the mask necessary for forming the black matrix of the non-display portion, the manufacturing cost can be lowered by reducing the number of masks.

However, since a laminated structure of a sub color filter is introduced into a non-display portion instead of a single black matrix layer, a step may be formed between the display portion and the non-display portion of the liquid crystal display panel, and the brightness irregularity may occur as the panel is turned. Therefore, it is preferable that two of the red, green and blue color filters are laminated in the laminated portion of the color filter layer.

In addition, in order to solve the problem of step difference between the display part and the non-display part, a part of the laminated part of the color filter layer 202 may be a patterned structure. When the laminated portion is formed by patterning the specific sub color filter material to flow between the different sub color filters, the height of the laminated portion is reduced as compared with the case of simply laminating the sub color filters. As a result, the step difference between the display portion and the non- Can be prevented.

Specifically, when a part of the laminated portion of the color filter layer 202 is patterned, the height difference between the display portion and the non-display portion may be 0.5 to 1 μm. In this case, the degree of preventing the panel from being warped is significantly improved, The nonuniformity improvement effect is increased.

5A to 5G, the shape of the pattern reduces the step between the display portion and the non-display portion, and is not particularly limited as long as it does not deviate from the object of the present invention. Specifically, the shape of the pattern is circular, oval, , A stripe pattern, and a lattice pattern.

The liquid crystal display according to the second embodiment of the present invention includes a display portion and a non-display portion, and the display portion includes a thin film transistor array substrate 109 having a protective film 108 including a protrusion 107, And a color filter substrate 106 opposed to the thin film transistor array substrate 109 via a fixing portion 102.

The thin film transistor array substrate 109 according to the second embodiment includes the protective film 108 including the protruding portion 107 and the fixed portion 102 may be formed to be thinner than the thickness of the insulating portion 104, The structure and effect of the liquid crystal display device of the first embodiment are the same as those of the liquid crystal display device of the first embodiment except that the display section faces the thin film transistor array substrate 109 and the color filter substrate 106 via the fixing section 102 and the projecting section 107 Therefore, the detailed description thereof will be omitted within the overlapping range.

6 is a cross-sectional view showing a conventional liquid crystal display device including a thin film transistor array substrate 9 having a protective film 10. 6 has planarized the color filter substrate including the overcoat layer 7 and has flattened the thin film transistor array substrate 9 including the protective film 10 so that the cell gap is formed by the column spacer (8).

However, according to the second embodiment of the present invention, as shown in Fig. 7, the thin film transistor array substrate 109 has the protective film 108 including the projecting portions 107. Fig. That is, the thin film transistor array substrate 109 according to the first embodiment does not include the protective film 108 on the upper part thereof, but the thin film transistor array substrate 109 according to the second embodiment includes the protrusions 107 at the uppermost part A protective film 108 is formed.

The protrusions 107 serve to hold the cell gap together with the fixed portion 102 and thereby the thin film transistor array substrate 109 and the color filter substrate 106 are supported and a liquid crystal layer is disposed therebetween do.

Since the protrusion 107 and the fixing portion 102 are disposed between the thin film transistor array substrate 109 and the color filter substrate 106 as the protective film 108 includes the protrusion 107, It may not have a column spacer.

8A to 8F illustrate a manufacturing process of the liquid crystal display device according to the second embodiment. Hereinafter, a manufacturing process of the liquid crystal display device according to the second embodiment will be described in detail with reference to FIGS.

First, on the base substrate 101, a first sub color filter, a second sub color filter on the upper surface and side surfaces of the first sub color filter, and a third sub color filter on the upper surface and side surfaces of the second sub color filter 8A). Next, a resin material 206 is applied on the exposed surfaces of the first through third sub-color filters (FIG. 8B).

Next, after the mask is disposed on the color filter to which the resin material 206 is applied as shown in FIG. 8C, the insulating portion 104 applies a full-tone mask to the fixing portion 102 ) And the protective portion are exposed using a halftone mask. After the photolithography process including the post-exposure development and the like, the color filter substrate 106 as shown in Fig. 8D is manufactured.

With respect to the fabrication of the thin film transistor array substrate, the protective film 108 forming material is applied on the upper surface thereof (FIG. 8E). In the second embodiment, the protective film not only protects the thin film transistor array substrate 109 from the outside, but also performs insulation and planarization functions.

At this time, the protective film forming material 208 may be made of a photosensitive organic material (PAC), but the present invention is not limited thereto.

Next, a mask is disposed on the thin film transistor array substrate 109 coated with the protective film forming material 208 as shown in FIG. 8F, and exposed with a full-tone mask to form a protrusion 107 And exposed by a halftone mask to form a protective film 108 which does not include the projecting portion 107.

That is, according to the second embodiment, the protective film 108 on the thin film transistor array substrate 109 may be thinner than the fixing portion 102 according to the first embodiment by having the protruding portion 107, The fixing portion 102 may be formed using a halftone mask 208 so that the thickness of the insulating portion 104 may be thicker than the thickness of the fixing portion 102 and the first protecting portion 103.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

1: Base substrate 2: Black matrix
3: Red color filter 4: Green color filter
5: Blue color filter 6: White color filter
7: Overcoat layer 8: Column spacer
9: thin film transistor array substrate 10: protective film
100: Color filter
101: base substrate 102:
103: first protecting portion 104: insulating portion
105: second protection portion 106: color filter substrate
107: protrusion 108: protective film
109: thin film transistor array substrate
201: first substrate 202: color filter layer
203: protective layer 204:
205: second substrate 206: resin material
207: Fulton mask 208: Halftone mask
209: Protective film forming material

Claims (11)

A display section including a thin film transistor array substrate and a color filter substrate; And
And a non-display portion surrounding the outermost region of the display portion,
The color filter substrate includes a base substrate, a first region in which red, green and blue sub-color filters are all stacked in a part of the base substrate, and a first region in which red, green and blue sub- A color filter including a second area in which a sub color filter is laminated, a fixing part disposed on the first area and in contact with the thin film transistor array substrate, a first protection part on the second area, And an insulating portion,
In the display portion, the thin film transistor array substrate and the color filter substrate face each other through the fixing portion,
The non-display portion includes a first substrate, a color filter layer on which at least two red, green and blue color filters are laminated on the first substrate, a protective layer on the color filter layer, and a second A liquid crystal display comprising a substrate.
The liquid crystal display of claim 1, wherein the first region further comprises a second protection portion provided on a side surface of the fixing portion.
The liquid crystal display of claim 2, wherein the thickness of the fixing portion is thicker than the thickness of the second protective portion.
The liquid crystal display of claim 1, wherein a thickness of the insulating portion is thicker than a thickness of the first protective portion.
A display section including a thin film transistor array substrate provided with a protective film including protrusions and a color filter substrate; And
And a non-display portion surrounding the outermost region of the display portion,
The color filter substrate includes a base substrate, a first region in which red, green and blue sub-color filters are all stacked in a part of the base substrate, and a first region in which red, green and blue sub- A color filter including a second region in which a sub color filter is laminated, a fixing portion on the first region, a first protection portion on the second region, and an insulating portion on one side of the color filter,
In the display portion, the thin film transistor array substrate and the color filter substrate face each other via the fixing portion and the protruding portion,
The non-display portion includes a first substrate, a color filter layer on which at least two red, green and blue color filters are laminated on the first substrate, a protective layer on the color filter layer, and a second A liquid crystal display comprising a substrate.
The liquid crystal display according to claim 5, wherein the first region further comprises a second protection portion provided on a side surface of the fixing portion.
The liquid crystal display according to claim 5, wherein a thickness of the insulating portion is thicker than a thickness of the fixing portion and the first protection portion.
The liquid crystal display device according to any one of claims 1 to 5, wherein two of red, green and blue color filters are laminated on the laminated portion of the color filter layer.
The liquid crystal display device according to any one of claims 1 to 5, wherein a part of the laminated portion of the color filter layer is patterned.
The liquid crystal display of claim 9, wherein the pattern comprises at least one selected from the group consisting of a circle, an ellipse, a triangle, a rectangle, a stripe, and a lattice pattern.
The liquid crystal display device according to claim 9, wherein a height difference between the display portion and the non-display portion is 0.5 to 1 μm.

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