KR20140086395A - Liquid crystal display device and Method for manufacturing the same - Google Patents

Liquid crystal display device and Method for manufacturing the same Download PDF

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Publication number
KR20140086395A
KR20140086395A KR1020120156826A KR20120156826A KR20140086395A KR 20140086395 A KR20140086395 A KR 20140086395A KR 1020120156826 A KR1020120156826 A KR 1020120156826A KR 20120156826 A KR20120156826 A KR 20120156826A KR 20140086395 A KR20140086395 A KR 20140086395A
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South Korea
Prior art keywords
color filter
forming
pigment
liquid crystal
cover
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KR1020120156826A
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Korean (ko)
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KR102009477B1 (en
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김상엽
황태웅
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엘지디스플레이 주식회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/201—Filters in the form of arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G02F1/133516—Methods for their manufacture, e.g. printing, electro-deposition or photolithography
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)

Abstract

The present invention relates to a liquid crystal display device which is capable of preventing a light leakage due to a step difference between color filters in a COT (Color Filter On TFT) structure in which the color filters are formed on a TFT array substrate, and a method for manufacturing the same. The method for manufacturing a liquid crystal display device according to an embodiment of the present invention includes the steps of: forming thin film transistors in a plurality of pixel areas defined by a plurality of gate lines and a plurality of data lines; forming first and second color filters to cover the thin film transistors; forming a third color filter to cover the first and second color filters; planarizing the first to third color filters at the same height through a dry etching process; forming pixel electrodes on the first to third color filters; and forming a protective layer to cover the pixel electrodes and forming a common electrode on the protective layer.

Description

[0001] The present invention relates to a liquid crystal display device and a manufacturing method thereof,

The present invention relates to a liquid crystal display device and a method of manufacturing the same that prevent light leakage due to a step between color filters in a structure in which a color filter is formed on a TFT array substrate.

Liquid crystal display devices have a wide variety of applications ranging from notebook computers, monitors, spacecrafts and aircraft to the advantage of low operating voltage and low power consumption and being portable.

A liquid crystal display device includes an upper substrate, a lower substrate, and a liquid crystal layer formed between the two substrates. The liquid crystal display device adjusts the alignment of the liquid crystal layer depending on whether an electric field is applied or not, to be.

Hereinafter, a conventional liquid crystal display device will be described with reference to the drawings.

1 and 2 are schematic cross-sectional views of a liquid crystal display device according to the related art. 1 and 2, the upper substrate, the liquid crystal layer, and the driving circuit of the liquid crystal display device are not shown.

1 and 2, a conventional liquid crystal display device includes an upper substrate (not shown), a lower substrate 1, and a liquid crystal layer (not shown) formed between the upper substrate and the lower substrate 1 .

A plurality of gate lines (not shown) and a plurality of data lines 40 are formed on the glass substrate 10 of the lower substrate 1 so as to define a plurality of pixel regions, and TFTs 30 , a thin film transistor) is formed.

A color filter 20 of red (R), green (G), and blue (B) is formed in each pixel, and a black matrix (BM) for preventing light leakage is formed. In addition, a column spacer (CS) for forming a cell gap with the upper substrate is formed on the black matrix (BM).

A color filter 20 is formed so as to cover the TFT 30 and a pixel electrode 50 is formed on the color filter 20. A protective layer 60 is formed to cover the pixel electrode 50 and a common electrode 70 is formed on the protective layer 60.

As shown in FIG. 1, the conventional liquid crystal display device including the above-described structure prevents the light leakage in the region where the data line 40 is formed by overlapping the pigment and forming the color filter 20.

As shown in FIG. 2, after the common electrode 70 is formed in manufacturing the lower substrate 1, the rubbing process is performed using the rubbing cloth 80 for the initial alignment of the liquid crystal. Here, the color filters 20 of red (R), green (G), and blue (B) are overlapped with each other to cause a step in the color filter 20, and particularly in a region overlapping with the data line 40 The level difference of the color filter is worsened and the rubbing is not smoothly performed, so that light leakage occurs.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a liquid crystal display device and a method of manufacturing the same that can prevent light leakage due to a step between color filters.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, including: forming a thin film transistor in a plurality of pixel regions defined by a plurality of gate lines and a plurality of data lines; Forming a first color filter and a second color filter to cover the thin film transistor; Forming a third color filter to cover the first color filter and the second color filter; Performing a dry etch process to planarize the first color filter, the second color filter, and the third color filter to the same height; Forming a pixel electrode on the first color filter, the second color filter, and the third color filter; And forming a protective layer to cover the pixel electrode, and forming a common electrode on the protective layer.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a plurality of gate lines and a plurality of data lines crossing each other on a lower substrate; A plurality of thin film transistors formed in a plurality of pixel regions defined by the plurality of gate lines and the plurality of data lines; A first color filter, a second color filter, and a third color filter formed on top of the plurality of thin film transistors; A pixel electrode formed on the first color filter, the second color filter, and the third color filter and connected to the drain electrode of the thin film transistor; A protective layer formed to cover the pixel electrode; And a common electrode formed on the protective layer, wherein the first color filter, the second color filter, and the third color filter are formed to be flush with the same height.

The liquid crystal display device and the method of manufacturing the same according to the embodiment of the present invention can prevent light leakage in the COT structure by flattening the color filters.

According to the present invention, since the thin film transistor, the pixel electrode, the common electrode, the color filter, and the column spacer are formed on the lower substrate, the process line for the upper substrate facing the lower substrate can be omitted or simplified .

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 and 2 are schematic cross-sectional views of a liquid crystal display device according to the related art.
3 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.
4 and 5 are views illustrating a method of manufacturing a color filter in a COT (color filter on TFT) structure according to an embodiment of the present invention.

It should be noted that, in the specification of the present invention, the same reference numerals as in the drawings denote the same elements, but they are numbered as much as possible even if they are shown in different drawings.

Meanwhile, the meaning of the terms described in the present specification should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one.

In describing an embodiment of the present invention, when it is described that a structure is formed on or above another structure, and below or below it, such a substrate may be formed of any of these structures, To the extent that a third structure is interposed between the first and second structures.

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

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

3, a liquid crystal display device according to an embodiment of the present invention includes an upper substrate (not shown), a lower substrate 100, and a liquid crystal layer (not shown) formed between the upper substrate and the lower substrate 100 .

A plurality of gate lines (not shown) and a plurality of data lines 140 are formed on the glass substrate 110 of the lower substrate 100 so as to define a plurality of pixel regions, Is formed.

A color filter 120 of red (R), green (G), and blue (B) is formed in each pixel, and a black matrix (BM) for preventing light leakage is formed. In addition, a column spacer (not shown) for forming a cell gap with the upper substrate is formed on the black matrix BM.

A color filter 120 of red (R), green (G), and blue (B) is formed to cover the TFT 130 and a pixel electrode 150 is formed on the color filter 120. A protective layer 160 is formed to cover the pixel electrode 150 and a common electrode 170 is formed on the protective layer 160.

The gate line and the data line may be arranged in a straight line or in a bent straight line. The TFT 130 is formed as a switching element in a region where the gate line and the data line cross each other.

The thin film transistor T includes a gate electrode, a semiconductor layer, a source electrode, and a drain electrode. The gate electrode is branched at the gate line, the source electrode is branched at the data line, and the drain electrode is formed to face the source electrode. In FIG. 3, a bottom gate type TFT in which a gate electrode is located below a semiconductor layer is shown as an example. However, the present invention is not limited thereto. For example, in a top gate type in which a gate electrode is located above a semiconductor layer, Can be formed.

The pixel electrode 150 is formed on each of the pixels, and the pixel electrode 150 is electrically connected to the drain electrode of the TFT 130. In particular, the pixel electrode 150 may be electrically connected to a drain electrode of the thin film transistor T through a predetermined contact hole.

The common electrode 170 is arranged in a different layer from the pixel electrode 150. The common electrode 170 and the common electrode 170 are connected to each other through a fringe field generated between the pixel electrode 150 and the common electrode 170, The orientation of the layers can be adjusted.

The common electrode 170 is connected to a common line arranged in parallel with the gate line 11 so that a common voltage can be applied to the common electrode 170 through the common line.

In the present invention, the color filters of red (R), green (G), and blue (B) Of the color filters 120 are formed flat without overlapping each other. That is, the color filters 120 of red (R), green (G), and blue (B) are formed to have the same height so that the color filters of red (R), green (G), and blue 120 are not formed.

In addition, the color filter 120 in the region where the data line 140 is formed is also formed to have the same height as the other regions, so that defects of the light leakage caused by the step of the color filter can be prevented.

4 and 5 are views illustrating a method of manufacturing a color filter in a COT (color filter on TFT) structure according to an embodiment of the present invention.

A method of manufacturing a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIG. 3 and FIG. 4 and FIG.

A gate electrode 131 is formed on a glass substrate 110 and a gate insulating film 132 is formed on the gate electrode 131. [ Thereafter, a semiconductor layer 133 is formed on the gate insulating layer 132, a source electrode 134 is formed on one side of the upper side of the semiconductor layer 133, a drain electrode 134 is formed on the other side of the semiconductor layer 133, (135). Thus, the TFT 130 can be formed for each pixel.

Next, referring to FIG. 4, a color filter 120 is formed to cover the TFT 130. FIG.

First, a red color filter 120R is formed with a red pigment, and then a green color filter 120G is formed with a green pigment. At this time, the green pigment overlaps the boundary portion of the red color filter 120R, and a step is generated in the region where the red color filter 120R and the green color filter 120G are overlapped.

Then, a blue pigment is formed so as to cover the red color filter 120R and the green color filter 120G. Through this, the blue color filter 120B is formed thick to cover the red color filter 120R and the green color filter 120G.

A red pigment and a green pigment are coated to form the red color filter 120R and the green color filter 120G and then a blue pigment is coated on the entire surface of the substrate to form the red color filter 120R and the green color filter The blue color filter 120B is formed so as to cover the color filters 120G.

Next, referring to FIG. 5, a dry etch process is performed on the blue color filter 120B to cover the red color filter 120R and the green color filter 120G.

The height of the blue color filter 120B covering the red color filter 120R and the green color filter 120G is lowered and then the green color filter 120G projected over the boundary portion of the red color filter 120R Remove the part.

Thus, the red color filter 120R, the green color filter 120G, and the blue color filter 120B are flattened to have the same height by performing the dry etching process.

Thus, the heights of the red color filter 120R, the green color filter 120G and the blue color filter 120B are all made the same, and the overlapped portions at the boundary portions of the respective color filters can be removed.

3, the color filter 120 is formed so that the heights of the red color filter 120R, the green color filter 120G and the blue color filter 120B are flat. Electrode 150 is formed.

A color filter 120 overlapped with the drain of the TFT 130 is etched to form a contact hole and a transparent conductive material such as ITO is deposited on the color filter 120 and the contact hole, (150).

A protective layer 160 is formed to cover the pixel electrode 150 and a common electrode 170 is formed on the protective layer 160. Thereafter, a rubbing process using a rubbing cloth is performed.

The liquid crystal display device according to the embodiment of the present invention manufactured through the above-described manufacturing method has a red color filter 120R, a green color filter 120G and a blue color filter 120B formed on the lower substrate 100, So that the rubbing process using the rubbing cloth can be smoothly performed. It is possible to prevent light leakage by uniformly rubbing on the entire surface of the lower substrate 100.

100: lower substrate 110: glass substrate
120: Color filter 120R: Red color filter
120G: Green color filter 120B: Blue color filter
130: TFT 140: Data line
150: pixel electrode 160: protective layer
170: common electrode BM: black matrix

Claims (8)

Forming thin film transistors in a plurality of pixel regions defined by a plurality of gate lines and a plurality of data lines;
Forming a first color filter and a second color filter to cover the thin film transistor;
Forming a third color filter to cover the first color filter and the second color filter;
Performing a dry etch process to planarize the first color filter, the second color filter, and the third color filter to the same height;
Forming a pixel electrode on the first color filter, the second color filter, and the third color filter; And
Forming a protective layer covering the pixel electrode, and forming a common electrode on the protective layer. The method according to claim 1,
Forming the second color filter so as to overlap with a boundary portion of the first color filter in forming the first color filter and the second color filter,
And removing the overlapped portions of the first color filter and the second color filter through the dry etch. The method according to claim 1,
Wherein the first color filter is a red color filter,
The second color filter is a green color filter,
And the third color filter is a blue color filter. The method according to claim 1,
Coating the first pigment and the second pigment to form the first color filter and the second color filter,
Wherein the third color filter is formed to cover the first color filter and the second color filter by coating a third pigment on the entire surface of the glass substrate. 5. The method of claim 4,
Wherein the first pigment is a red pigment,
Wherein the second pigment is a green pigment,
Wherein the third pigment is a blue pigment. A plurality of gate lines and a plurality of data lines formed to cross over the lower substrate;
A plurality of thin film transistors formed in a plurality of pixel regions defined by the plurality of gate lines and the plurality of data lines;
A first color filter, a second color filter, and a third color filter formed on top of the plurality of thin film transistors;
A pixel electrode formed on the first color filter, the second color filter, and the third color filter and connected to the drain electrode of the thin film transistor;
A protective layer formed to cover the pixel electrode; And
And a common electrode formed on the protective layer,
Wherein the first color filter, the second color filter, and the third color filter are formed to be flush with the same height. The method according to claim 6,
Wherein the first color filter is a red color filter,
The second color filter is a green color filter,
And the third color filter is a blue color filter. The method according to claim 6,
An upper substrate bonded to the lower substrate,
Wherein a liquid crystal layer is interposed between the lower substrate and the upper substrate.
KR1020120156826A 2012-12-28 2012-12-28 Method for manufacturing Liquid crystal display device KR102009477B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9417498B2 (en) 2015-01-09 2016-08-16 Samsung Display Co., Ltd. Liquid crystal display
US9541811B2 (en) 2015-01-02 2017-01-10 Samsung Display Co., Ltd. Thin film transistor array panel and manufacturing method thereof
KR101875695B1 (en) * 2015-11-30 2018-07-06 엘지디스플레이 주식회사 Array Substrate For Liquid Crystal Display Device And Method Of Fabricating The Same
US10241246B2 (en) 2016-03-22 2019-03-26 Samsung Display Co., Ltd. Color filter array panel and a display device including the same
CN109656056A (en) * 2019-02-28 2019-04-19 上海天马微电子有限公司 Reflective display panel and reflection display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050116032A (en) * 2004-06-04 2005-12-09 엘지.필립스 엘시디 주식회사 Color filter array substrate and fabricating method thereof
JP2006106602A (en) * 2004-10-08 2006-04-20 Toshiba Matsushita Display Technology Co Ltd Method for manufacturing liquid crystal display device
KR20110040222A (en) * 2009-10-13 2011-04-20 엘지디스플레이 주식회사 Fringe field switching liquid crystal display device and method of fabricating the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050116032A (en) * 2004-06-04 2005-12-09 엘지.필립스 엘시디 주식회사 Color filter array substrate and fabricating method thereof
JP2006106602A (en) * 2004-10-08 2006-04-20 Toshiba Matsushita Display Technology Co Ltd Method for manufacturing liquid crystal display device
KR20110040222A (en) * 2009-10-13 2011-04-20 엘지디스플레이 주식회사 Fringe field switching liquid crystal display device and method of fabricating the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9541811B2 (en) 2015-01-02 2017-01-10 Samsung Display Co., Ltd. Thin film transistor array panel and manufacturing method thereof
US9417498B2 (en) 2015-01-09 2016-08-16 Samsung Display Co., Ltd. Liquid crystal display
KR101875695B1 (en) * 2015-11-30 2018-07-06 엘지디스플레이 주식회사 Array Substrate For Liquid Crystal Display Device And Method Of Fabricating The Same
US10241246B2 (en) 2016-03-22 2019-03-26 Samsung Display Co., Ltd. Color filter array panel and a display device including the same
CN109656056A (en) * 2019-02-28 2019-04-19 上海天马微电子有限公司 Reflective display panel and reflection display device
CN109656056B (en) * 2019-02-28 2021-07-16 上海天马微电子有限公司 Reflective display panel and reflective display device

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