KR20060119447A - Display device - Google Patents

Abstract

A display device is provided to optimize the width of a coupling member, which binds an array substrate and a color filter substrate, by forming the coupling member to include a contact member, through which a common voltage is applied. An array substrate(300) has a display area(DA) with plural pixels and a peripheral area(PA1) with a driver(500) and a metal pad(350) for applying common voltage. A color filter substrate(400) has a color filter layer(420) corresponding to the pixels and a common electrode layer(460) formed on the color filter layer. A coupling member(700) is formed in the peripheral area of the array substrate, and binds the array substrate and the color filter substrate. A contact member(450) is formed correspondingly to the coupling member on the color filter substrate, and brings the metal pad into electric contact with the common electrode layer. The contact member is composed of color material layers(DR,DG,DB).

Description

Display {DISPLAY DEVICE}

1 is a plan view illustrating a display device according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1.

FIG. 3 is a view for explaining a formation state of the contact member and the coupling member shown in FIG. 2.

4A to 4G are cross-sectional views illustrating a manufacturing process of a display device according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: display device 200: display panel

300: pixel substrate 310: first substrate

320: pixel array 330: passivation layer

340: pixel electrode layer 400: color filter substrate

410: second substrate 420: color filter layer

430: first light blocking layer 440: second light blocking layer

450: contact member 451: photoresist column

460: common electrode layer 500: gate driver

600: data driver 700: coupling member

800: liquid crystal layer

The present invention relates to a display device, and more particularly, to a display device that can simplify a manufacturing process and prevent malfunction.

In general, a liquid crystal display device includes a pixel substrate, a color filter substrate facing the pixel substrate, and a liquid crystal layer interposed between the pixel substrate and the color filter substrate.

When an electric field is formed between the pixel substrate and the color filter substrate by a signal from the outside, the arrangement angle of the liquid crystal molecules included in the liquid crystal layer is changed. The liquid crystal display displays an image by controlling the transmittance of light passing through the liquid crystal layer in which the arrangement angle of the liquid crystal molecules is changed.

The pixel substrate includes a display area in which a pixel part is formed to display an image. The pixel portion includes a plurality of gate lines, a data line intersecting the plurality of gate lines insulated from each other, a plurality of thin film transistors electrically connected to the plurality of gate lines and the plurality of data lines, and the plurality of thin films. A plurality of pixel electrodes electrically connected to the drain electrode of the transistor.

A peripheral region in which a gate driving circuit for outputting a gate signal is formed on the plurality of gate lines is formed around the pixel substrate. The gate driving circuit is formed together when the thin film transistor is formed in the display area.

The color filter substrate includes a common electrode facing the plurality of pixel electrodes with the liquid crystal layer interposed therebetween. In addition, the common electrode may face the liquid crystal layer with the gate driving circuit in the peripheral area.

Thus, parasitic capacitance is generated between the gate driving circuit and the common electrode. The parasitic capacitance distorts or delays the signal output from the gate driving circuit, and as a result, the liquid crystal display device malfunctions due to the parasitic capacitance.

In order to reduce the parasitic capacitance between the gate driving circuit and the common electrode to prevent a malfunction of the gate driving circuit, a coupling member formed of a material having a relatively lower dielectric constant than the liquid crystal layer is formed between the gate driving circuit and the common electrode. It is arranged to reduce the RC delay of the gate driving circuit to ensure the driving ability of the gate driving circuit.

As the width of the coupling member is extended, the RC delay may be reduced, thereby improving driving ability of the gate driving circuit. However, the coupling member is generally formed on the light shielding layer that divides the display area and the peripheral area so as not to be viewed from the outside. However, the width of the light blocking layer is determined in the design of the liquid crystal display, and a contact member is formed on the light blocking layer to be electrically connected to the pixel substrate to provide a common voltage to the common electrode. Increasing increases the process margin of the contact member.

An object of the present invention to solve the above problems is to provide a display device that can simplify the manufacturing process and prevent malfunction.

In order to achieve the above object, a display device according to an exemplary embodiment includes a pixel substrate, a color filter substrate, a coupling member, and a contact member. In the pixel substrate, a plurality of pixel parts are formed in a display area, and a metal pattern is applied to a driving part for driving the pixel parts and a common voltage in a peripheral area. The color filter substrate includes a color filter layer formed corresponding to the pixel parts, and a common electrode layer formed on the color filter layer. The coupling member is formed in the peripheral region to combine the pixel substrate and the color filter substrate to accommodate the liquid crystal layer. The contact member is formed of color pixels on the color filter substrate corresponding to a region where the coupling member is formed, and electrically contacts the metal pattern and the common electrode layer.

The color filter layer includes red, green, and blue color pixels, and the contact member is formed in a multilayer structure in which the red, green, and blue color pixels are stacked. The contact member may further include a common electrode layer covering the multi-colored pixels.

A plurality of contact members are formed, and the contact members are formed on the same line in a direction parallel to the boundary line between the peripheral area and the display area.

According to such a display device, a manufacturing process of the display device can be simplified by omitting a process step for forming the contact member. In addition, since the coupling member including the contact member is formed on the second light blocking layer having a predetermined width, the width of the coupling member can be extended. Therefore, the RC delay of the display device can be reduced by the coupling member, and the malfunction of the gate driving circuit can be prevented, thereby improving the driving capability of the display device.

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

1 is a plan view illustrating a display device according to an exemplary embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the cutting line I-I 'of FIG. 1, and FIG. 3 is a contact member of FIG. 2. And a view for explaining the formation state of the engaging member.

1 and 2, the display device 100 according to an exemplary embodiment of the present invention includes a display panel 200 displaying an image.

The display panel 200 includes a pixel substrate 300, a color filter substrate 400, a liquid crystal layer 800, and a coupling member 700.

The pixel substrate 300 includes a first substrate 310, a pixel array 320, a passivation layer 330, and a pixel electrode layer 340.

The first substrate 310 may include a display area DA in which an image is displayed, a first peripheral area PA1 surrounding the display area DA, and a second peripheral area adjacent to the first peripheral area PA1 ( PA2).

The pixel array 320 is provided on the display area DA. The pixel array 320 includes a plurality of gate lines GL1 to GLn, a plurality of data lines DL1 to DLm, a plurality of thin film transistors 321, and a plurality of pixel electrodes 322. Where n and m are one or more natural numbers.

The plurality of gate lines GL1 to GLn intersect with the plurality of data lines DL1 to DLm to be electrically insulated. The plurality of thin film transistors and the plurality of pixel electrodes are provided in an area partitioned by the plurality of gate lines GL1 to GLn and the plurality of data lines DL1 to DLm, and thus the plurality of gate lines GL1 to GLn. ) And the plurality of data lines DL1 to DLm.

For example, the gate electrode of the first thin film transistor 321 is connected to the first gate line GL1, the source electrode is connected to the first data line DL1, and the drain electrode is the first pixel electrode 322. Is coupled to. In addition, the first thin film transistor 310 is formed of, for example, an amorphous silicon transistor.

In the passivation layer 330, a contact hole CNT is formed to expose a portion of the pixel array 320 so as to electrically connect the pixel array 320 and the pixel electrode layer 340. It serves to protect the 320.

The pixel electrode layer 340 is formed to have a uniform thickness on the passivation layer 330. The pixel electrode layer 340 is made of indium tin oxide (ITO) or indium zinc oxide (IZO), which is a transparent conductive material, and the pixel electrode 322 and the contact hole CNT Is electrically connected through.

In addition, a metal pattern 350 is formed on the pixel substrate 300 to be electrically connected to the color filter substrate 400 to provide a common voltage to the color filter substrate 400. To this end, a portion of the passivation layer 330 corresponding to the first peripheral area PA1 of the pixel electrode layer 340 is opened, and the first peripheral area PA1 of the pixel electrode layer 340 is opened. The pixel electrode layer in the region corresponding to the second electrode is electrically connected to the metal pattern 350.

In addition, the display device 100 according to an exemplary embodiment of the present invention further includes a gate driver 500 and a data driver 600 formed on the pixel substrate 300.

The gate driver 500 is provided on the first peripheral area PA1 of the first substrate 310 adjacent to one end of the plurality of gate lines GL1 to GLn. ) Is electrically connected to the gate lines GL1 to GLn, so that the gate driver 500 sequentially outputs gate signals to the gate lines GL1 to GLn.

The gate driver 500 includes one shift register including a plurality of driving transistors (not shown). Therefore, the gate driver 500 formed in the first peripheral area PA1 is formed together when the pixel array 320 is formed in the display area DA. For example, the plurality of driving transistors may be formed of amorphous silicon transistors, such as the thin film transistors.

The data driver 600 has a chip shape and is mounted on the second peripheral area PA2 of the first substrate 310. The data driver 600 is electrically connected to one ends of the plurality of data lines DL1 to DLm to output data signals to the plurality of data lines DL1 to DLm.

The color filter substrate 400 includes a second substrate 410, a color filter layer 420, a first light blocking layer 430, a second light blocking layer 440, a contact member 450, and a common electrode layer 460. do.

The second substrate 410 faces the first substrate 310.

The color filter layer 420 is formed on the second substrate 410 and is formed of red, green, and blue color pixels (R, G, and B). In the display area DA, the second substrate 410 has a first color area CA1 in which the red color R is formed, and a second color area CA2 in which the blue color B is formed. ) And a third color area CA3 in which the green color pixel G is formed.

The first light blocking layer 430 is formed on the second substrate 410 and partitions two color pixels adjacent to each other. Therefore, the boundary between the first to third color regions CA1 to CA3 is ensured by the first light blocking layer 430.

The second light blocking layer 440 is formed at a position corresponding to the first peripheral area PA1 on the second substrate 410, and partitions the display area DA and the first peripheral area PA1. do. Accordingly, the second light blocking layer 440 may project the gate driver 500 formed on the first substrate 310 to be projected on the screen of the display panel 400 in the first peripheral area PA1. prevent. In addition, the second light blocking layer 440 may be formed at a position corresponding to the second peripheral area PA2 to partition the display area DA and the second peripheral area PA2.

The contact member 450 is formed in a predetermined region inside the coupling member 700. The contact member 450 includes dummy red, dummy green, and dummy blue color pixels (DR, DG, and DB), and the dummy red, dummy green, and dummy blue color pixels (DR, DG, and DB) are sequentially stacked. Has a structure.

The dummy red color DR formed in the first peripheral area PA1 is formed simultaneously with the red color R formed in the first color area CA1, and is formed in the first peripheral area PA1. The dummy green pixel DG is formed at the same time as the green pixel G formed in the second color area CA2, and the dummy blue pixel DB formed in the first peripheral area PA1. Is simultaneously formed with the blue color B formed in the third color area CA3.

In addition, a second common electrode layer 462 connected to a first common electrode layer 461 of the common electrode layer 460 is formed in the contact member 450 in a state where the dummy color pixels DR, DG, and DB are formed. . The second common electrode layer 462 is electrically connected to the pixel electrode layer 330 on the first peripheral area PA1, so that the common voltage Vcom provided from the metal pattern 350 to the pixel electrode layer 330 is applied to the second common electrode layer 462. The first common electrode layer 461 is provided.

The common electrode layer 460 is formed to have a uniform thickness on the color filter layer 420 and the light blocking layers 430 and 440. The common electrode layer 460 is made of indium tin oxide (ITO) or indium zinc oxide (IZO), which is a transparent conductive material.

The liquid crystal layer 800 is interposed between the pixel substrate 300 and the color filter substrate 400 in the display area DA, and is disposed at a potential difference between the pixel electrode layer 340 and the common electrode layer 460. The arrangement angle of the liquid crystal molecules included in the liquid crystal layer 800 is changed by the electric field formed by the electric field to display a predetermined image.

The coupling member 700 is interposed between the pixel substrate 300 and the color filter substrate 400 in the first peripheral area PA1. The coupling member 700 is formed in the first peripheral area PA1 including the contact member 450.

That is, as shown in FIG. 3, the contact member 450 is formed in plural in the contact portion 710 formed in the coupling member 700. The contact portion 710 is a portion of the passivation layer 330 to connect the metal electrode 350 formed on the pixel electrode layer 340 and the pixel substrate 300 to provide a common voltage provided from the outside. Is an open area.

The coupling member 700 is made of a material having a lower dielectric constant than the liquid crystal layer 800. The coupling member 700 covers the contact portion 710 and is formed on the second light blocking layer 440. Therefore, the contact member 450 is formed in a shape included in the coupling member 700.

The parasitic capacitance generated between the common electrode layer 460 and the gate driver 500 provided in the pixel substrate 300 may be reduced by the coupling member 700. Accordingly, distortion of the input / output signal of the gate driver 500 may be prevented, and as a result, malfunction of the liquid crystal display 100 may be prevented.

In addition, the contact member 450 may be formed in a shape included in the coupling member 700 to expand the width of the coupling member 700, thereby reducing the RC delay of the gate driver 500. By reducing it, the driving ability of the gate driver 500 may be improved. In addition, the contact portion 710 is formed inside the coupling member 700 to prevent exposure, thereby preventing damage due to corrosion.

4A to 4G are cross-sectional views illustrating a manufacturing process of a display device according to an exemplary embodiment of the present invention. In particular, the manufacturing process of the color filter substrate shown in FIG. 2 is shown.

Referring to FIG. 4A, a chromium oxide (CrO ₂ ) layer or an organic light blocking layer is stacked on the second substrate 410, and the first and second light blocking layers 430 and 440 are patterned by patterning the chromium oxide or organic light blocking layer. To form.

The first light blocking layer 430 is formed on the second substrate 410 between two color areas adjacent to each other among the display areas DA shown in FIG. 1. The second light blocking layer 440 is formed on the second substrate 410 at a position corresponding to the first peripheral area PA1 shown in FIG. 1.

Thereafter, a first photoresist 421 including a red pigment or a dye is stacked on the second substrate 410 on which the first and second light blocking layers 430 and 440 are formed.

When the first photoresist 421 is patterned, a red pixel R is formed in the first color area CA1 of the display area DA, as shown in FIG. 4B, and the first peripheral area ( In the PA1), a dummy red color DR is formed. The dummy red color DR is formed on the second light blocking layer 440. In addition, the dummy red color DR may be formed in an area of the first peripheral area PA1 in which the second light blocking layer 440 is not formed.

4C, a second photoresist 422 including a green pigment or dye is coated on the second substrate 410. When the second photoresist 422 is patterned, as shown in FIG. 4D, a green color G is formed in the second color area CA2 of the display area DA, and the first peripheral area is formed. A dummy green color pixel DG is formed in PA1. The dummy green color pixel DG is formed on the dummy red color DR.

4E, a third photoresist 423 including a blue pigment or dye is coated on the second substrate 410. When the third photoresist 423 is patterned, as illustrated in FIG. 4F, a blue color pixel B is formed in the third color area CA3 of the display area DA, and the first peripheral area is formed. A dummy blue color DB is formed in PA1. The dummy blue pixel DB is formed on the dummy green pixel DG.

Accordingly, the color filter layer 420 formed of the red, green, and blue color pixels R, G, and B is formed on the second substrate 410 corresponding to the display area DA. In addition, a photoresist column 451 in which dummy red, dummy green, and dummy blue color pixels DR, DG, and DB are stacked is formed on the second light blocking layer 232 corresponding to the first peripheral area PA1. do. Each of the dummy red, dummy green, and dummy blue color pixels DR, DG, and DB may be formed to have a thickness of about 1.1 to 1.6 um. Accordingly, the thickness of the photoresist pillar 451 is It can be formed in approximately 3.3 ~ 4.8um. In addition, a size of the photoresist pillar 451 is formed between the pixel substrate 300 and the color filter substrate 400 illustrated in FIG. 2 to space the pixel substrate 300 from the color filter substrate 400. It is sufficient to form to a greater extent than the column spacer (column spacer) to maintain a constant.

Subsequently, as illustrated in FIG. 4G, indium tin oxide (ITO) or indium zinc oxide (ITO), which is a transparent conductive material, is formed on the first and second light blocking layers 430 and 440 and the color filter layer 420. Indium Zinc Oxide (IZO) is applied to form a common electrode layer 460.

Accordingly, the second common electrode layer 462 of the common electrode layer 460 is in direct electrical contact with the pixel electrode layer 340 shown in FIG. 1 to provide a common voltage provided from the outside to the first common electrode layer 461. Can be.

By forming the color filter substrate in this manner, the manufacturing process of the display device can be simplified, and a malfunction of the display device can be prevented.

According to the present invention as described above, the contact member for providing a common voltage to the common electrode layer is formed in the coupling member for coupling the pixel substrate and the color filter substrate, thereby reducing the width of the coupling member on the light shielding layer having a constant width Can be improved. Accordingly, parasitic capacitors generated between the common electrode of the display device and the gate driving circuit can be reduced, and the driving capability of the gate driving circuit can be improved.

In addition, the contact member may be formed using a photoresist for forming the color filter layer, thereby eliminating an independent process step for manufacturing the contact member, thereby simplifying the manufacturing process of the display device.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (6)

A pixel substrate in which a plurality of pixel parts are formed in a display area, and a metal pattern in which a common voltage is applied to a driving part for driving the pixel parts in a peripheral area; A color filter substrate including a color filter layer formed corresponding to the pixel portions, and a common electrode layer formed on the color filter layer; A coupling member formed in the peripheral region to combine the pixel substrate and the color filter substrate to accommodate a liquid crystal layer; And And a contact member formed of color pixels on the color filter substrate corresponding to a region where the coupling member is formed, to electrically contact the metal pattern and the common electrode layer. The color filter layer of claim 1, wherein the color filter layer comprises red, green, and blue color pixels. And the contact member has a multi-layered structure in which the red, green, and blue color pixels are stacked. The display device of claim 2, wherein the contact member further comprises a common electrode layer covering the multi-color pixels. The display device of claim 1, wherein a plurality of contact members are formed. The display device of claim 4, wherein the contact member is formed on the same line in a direction parallel to a boundary line between the peripheral area and the display area. The method of claim 1, wherein each pixel portion includes a switching element, And the driver includes a gate driver configured to output a gate signal to the switching element.

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