KR20080055069A - Liquid crystal display panel and liquid crystal display having the same - Google Patents

Abstract

An LCD panel and an LCD device having the same are provided to extend an adhesive agent and a polarizing plate formed on the upper side of a color filter substrate to cover a gate driver formed in the non-display area of a TFT substrate, thereby applying the same process to a product according to the model or size of the product. An LCD(Liquid Crystal Display) device comprises a TFT(Thin Film Transistor) substrate(100), a color filter substrate(200), a liquid crystal layer(260), a gate driver(500), and a polarizing plate(440). The TFT substrate includes a gate line, a data line, and a pixel electrode(151). The gate line is extended in a direction on a first substrate(111). The data line is extended in a direction where the data line crosses the gate line. The pixel electrode is formed in a pixel area defined by the gate line and the data line. The color filter substrate includes a black matrix(221), a color filter(231), and a common electrode(251). The black matrix is formed in correspondence to an area except the pixel area on a second substrate(211). The color filter and the common electrode are formed in correspondence to the pixel area. The liquid crystal layer is formed between the TFT substrate and the color filter substrate. The gate driver is formed in a predetermined area on the first substrate. The polarizing plate is attached to the upper side of the color filter substrate, and is extended to cover the gate driver.

Description

Liquid crystal display panel and liquid crystal display device having same {Liquid crystal display panel and liquid crystal display having the same}

1 is a schematic diagram of a liquid crystal display panel incorporating a gate driver.

2 is a cross-sectional view of a liquid crystal display panel with a built-in gate driver according to the present invention.

3 is an exploded perspective view for explaining the configuration of a liquid crystal display including a liquid crystal display panel in which a gate driver according to the present invention is incorporated.

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

10 and 300: liquid crystal display panel 11: source driver

12 and 500: gate driver 100: thin film transistor substrate

200: color filter substrate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD), and in particular, a liquid crystal for covering a gate driver mounted on a thin film transistor (TFT) substrate by stretching a polarizing plate formed on a color filter substrate. A display panel and a liquid crystal display device having the same.

The liquid crystal display device adjusts the amount of light transmitted according to an image signal applied to a plurality of control switches arranged in a matrix to display a desired image on the liquid crystal display panel. The liquid crystal display panel includes a thin film transistor substrate on which a thin film transistor and a pixel electrode and the like are formed, a color filter substrate on which a common electrode and the like are formed, and a liquid crystal layer injected therebetween.

The liquid crystal display is classified into an amorphous silicon thin film transistor liquid crystal display and a polysilicon thin film transistor liquid crystal display according to a material forming the thin film transistor. Although the amorphous silicon thin film transistor has a mobility of 100 to 200 times lower than the polysilicon thin film transistor, which is a main characteristic of the thin film transistor, the device fabrication is simple in a large area, and the device characteristics are low but uniform. As an amorphous silicon thin film transistor, the liquid crystal display is mainly manufactured with an amorphous silicon thin film transistor. On the other hand, polysilicon thin film transistors exhibit high mobility and device characteristics that amorphous silicon transistors cannot have. In the case of the amorphous silicon thin film transistor liquid crystal display, only the pixel portion is manufactured in the liquid crystal panel, and later, the driving circuit is connected by tape automated bonding (TAB) or chip on glass (COG), whereas in the polysilicon thin film transistor liquid crystal display, the pixel portion is In manufacturing, the data driving circuit and the gate driver are integrated at the same time, so that no separate driving circuit is required.

However, recently, due to the development of amorphous silicon technology, a technology for embedding a gate driver in a liquid crystal panel using an amorphous silicon thin film transistor has been developed. In particular, the gate driver is embedded on a substrate using an amorphous silicon thin film transistor in a mobile display, which requires the simplification of IC and module processes.

A gate driver using an amorphous silicon thin film transistor is formed in the periphery of the thin film transistor substrate. That is, in the liquid crystal display panel, the thin film transistor substrate is formed larger than the color filter substrate, the region where the thin film transistor substrate and the color filter substrate overlap with each other is a display region, and the non-overlapping region becomes a non-display region. It is formed in the display area.

The gate driver formed in the non-display area of the thin film transistor substrate is covered with epoxy resin, black tape, stiffner, or the like to protect the gate driver. These protective materials are selected according to the model or size of the product to be manufactured.

However, the coating of the gate driver using a different material according to the model or size of the product may cause confusion in the supply and application of materials, thereby making the manufacturing process of the liquid crystal display device inconsistent. In addition, since various coating materials are required in various ways, an increase in production cost is inevitable.

An object of the present invention is to provide a liquid crystal display device which can cover a gate driver formed on a thin film transistor substrate by applying the same process, depending on the product to be manufactured.

Another object of the present invention is to provide a liquid crystal display device in which the same process can be applied to a product by extending a portion of a polarizing plate attached to a color filter substrate to a gate driver to cover the gate driver.

A liquid crystal display panel according to the present invention includes a thin film transistor substrate including a gate line extending in one direction, a data line extending in a direction crossing the first substrate, and a pixel electrode formed in a pixel region defined by the liquid crystal display panel; A color filter substrate including a black matrix formed on a second substrate corresponding to a region other than the pixel region, a color filter formed corresponding to the pixel region, and a common electrode; A liquid crystal layer formed between the thin film transistor substrate and the color filter substrate; A gate driver formed in a predetermined region on the first substrate; And a polarizer attached to an upper surface of the color filter substrate and extending to cover the gate driver.

The polarizing plate is attached to the upper surface of the color filter substrate by an adhesive, the polarizing plate is tensioned with the adhesive.

The polarizing plate is composed of a plurality of layers, and the plurality of layers are attached to each other by an adhesive, and at least one of the plurality of layers is stretched together with the adhesive below.

The gate driver is formed in a non-display area of the thin film transistor substrate.

According to an exemplary embodiment of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal display panel which stretches and covers a gate driver formed on a thin film transistor substrate in a non-display area, and which displays an image; And a backlight unit for generating light and emitting the generated light to the liquid crystal display panel.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a schematic configuration diagram of a liquid crystal display panel in which a gate driver to which the present invention is applied is incorporated.

Referring to FIG. 1, the liquid crystal display panel 300 includes a thin film transistor substrate 100 and a color filter substrate 200. The apparatus further includes a source driver 11 for driving the data line and a gate driver 12 for driving the gate line. A thin film transistor, a pixel electrode, and the like are formed on the thin film transistor substrate 100, and a common electrode and the like are formed on the color filter substrate 200. In the liquid crystal display panel 300, the thin film transistor substrate 100 is formed larger than the color filter substrate 200, and an area where the thin film transistor substrate 100 and the color filter substrate 200 overlap each other is a display area ( A) and the non-overlapping area becomes the non-display area B. FIG. The gate driver 12 includes a thin film transistor, which is a switching element that connects an external clock signal and a gate line, and a circuit for controlling the gate driver 12. The gate driver 12 is disposed on the thin film transistor substrate 100 in the non-display area B. FIG. Is implemented.

2 is a cross-sectional view of a liquid crystal display panel in which a gate driver according to the present invention is formed on a thin film transistor substrate in a non-display area.

Referring to FIG. 2, the liquid crystal display panel 300 includes a thin film transistor substrate 100 and a color filter substrate 200 facing each other, and a liquid crystal layer 260 positioned therebetween, and the thin film transistor substrate 100. The gate driver 500 is formed in a region that does not face the color filter substrate 200.

The thin film transistor substrate 100 may include a plurality of gate lines (not shown) extending in one direction on the first insulating substrate 111, a plurality of data lines (not shown) crossing the gate lines (not shown), A pixel electrode 151 formed in a pixel region defined by a gate line (not shown) and a data line (not shown), and connected to a gate line (not shown), a data line (not shown), and a pixel electrode 151. The thin film transistor 125 may include a storage line (not shown) formed in parallel with the gate line (not shown) and including the storage electrode 123.

The gate electrode 122 is formed to partially protrude from the gate line (not shown). The source electrode 142 partially protrudes from the data line (not shown), and the drain electrode 143 is formed when the data line (not shown) is formed to be spaced apart from the source electrode 142 by a predetermined interval. The source electrode 142 and the drain electrode 143 are formed to partially overlap the gate electrode 122.

The gate electrode 122, the source electrode 142, and the drain electrode 143 form the thin film transistor 125. The thin film transistor 125 is a data line (not shown) in response to a signal supplied to a gate line (not shown). Pixel signal supplied to the pixel electrode 151 is charged. Accordingly, the gate electrode 122 of the thin film transistor 125 is connected to a gate line (not shown), the source electrode 142 is connected to a data line (not shown), and the drain electrode 143 is a pixel electrode 151. ) Is connected. The thin film transistor 125 may include a gate insulating layer 131, an active layer 132, and at least a portion of the active layer 132 sequentially formed between the gate electrode 122, the source electrode 142, and the drain electrode 143. The formed ohmic contact layer 133 is further included. In this case, the ohmic contact layer 133 may be formed on the active layer 132 except for the channel part.

The passivation layer 134 is formed on the thin film transistor 125. The protective film 134 may be formed of an inorganic material such as silicon nitride or silicon oxide, or may be formed of a low dielectric constant organic film. Of course, it may be formed of a double layer of an inorganic insulating film and an organic film.

The storage electrode 123 is included in a storage line (not shown) formed at the same time as the gate line (not shown). The storage electrode 123 forms a storage capacitor together with the pixel electrode 151 with the gate insulating layer 131 and the passivation layer 134 interposed therebetween.

In addition, the gate line 121 and the storage line (not shown) is preferably formed of at least one metal of Al, Nd, Ag, Cr, Ti, Ta, and Mo or an alloy containing them. In addition, the gate line 121 and the storage line (not shown) may be formed of a multilayer of a plurality of metal layers as well as a single layer. That is, it may be formed of a double layer including a metal layer such as Cr, Ti, Ta, Mo, etc. having excellent physicochemical properties and an Al-based or Ag-based metal layer having a low specific resistance. In addition, the above-described data line (not shown), the source electrode 142 and the drain electrode 143 may also be formed of the above-described metal, or may be formed of multiple layers.

The pixel electrode 151 is formed on the passivation layer 134 and is connected to the drain electrode 143 through the contact hole 161. In addition, the pixel electrode 151 has a cutout pattern 152 as domain restricting means for adjusting the alignment direction of the liquid crystal. In addition, the pixel electrode 151 may include protrusions instead of the incision pattern 152 as domain regulating means for alignment of liquid crystal molecules. The cutting pattern 152 of the pixel electrode 151 is formed to divide the liquid crystal layer 260 into a plurality of domains together with the cutting pattern 252 of the common electrode 251 which will be described later.

The color filter substrate 200 may include a common electrode having a black matrix 221, a color filter 231, an overcoat layer 241, and a cutout pattern 252 on the second insulating substrate 211. 251).

The black matrix 221 generally distinguishes between red, green, and blue filters, and uses an antireflective organic film to block direct light irradiation to the thin film transistors constituting the gate driver formed on the thin film transistor substrate 100. For example, the black matrix 221 is formed using a photosensitive organic material to which a pigment such as carbon black is added. Therefore, when the black matrix 221 is formed by using chromium or the like, malfunction of the thin film transistor due to light reflected from the color filter and incident on the thin film transistor of the gate driver can be prevented.

The color filter 231 is formed by repeating the red, green, and blue filters on the black matrix 221. The color filter 231 serves to impart color to light emitted from the light source and passing through the liquid crystal layer 260. The color filter 231 is formed of a photosensitive organic material.

The overcoat film 241 is formed on the black matrix 221 not covered by the color filter 231 and the color filter 231. The overcoat film 241 serves to protect the color filter 231 while planarizing the color filter 231 and is formed using an acrylic epoxy material.

The common electrode 251 is formed on the overcoat layer 241. The common electrode 251 is made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). The common electrode 251 directly applies a voltage to the liquid crystal layer 260 together with the pixel electrode 151 of the thin film transistor substrate. A cutting pattern 252 is formed on the common electrode 251. The common electrode cut pattern 252 divides the liquid crystal layer 260 into a plurality of domains along with the pixel electrode cut pattern 152 of the pixel electrode 151.

The pixel electrode cut pattern 152 and the common electrode cut pattern 252 may be formed in various shapes. For example, both the pixel electrode cutting pattern 152 and the common electrode cutting pattern 252 may be formed diagonally and orthogonally to each other.

In addition, the liquid crystal layer 260 is positioned between the thin film transistor substrate 100 and the color filter substrate 200. The liquid crystal layer 260 is, for example, a VA (vertically aligned) mode, and the liquid crystal molecules are vertical in the length direction when no voltage is applied. When voltage is applied, the liquid crystal molecules lie perpendicular to the electric field because the dielectric anisotropy is negative. However, if the pixel electrode incision pattern 152 and the common electrode incision pattern 252 are not formed, the liquid crystal molecules are arranged randomly in various directions because the azimuth angle of the lying down is not determined, and the foreground line at the boundary surface of which the orientation directions are different from each other. ) The pixel electrode cut pattern 152 and the common electrode cut pattern 252 form a fringe field when a voltage is applied to the liquid crystal layer 260 to determine the azimuth angle of the liquid crystal alignment. In addition, the liquid crystal layer 260 is divided into multiple regions according to the arrangement of the pixel electrode cutting pattern 152 and the common electrode cutting pattern 252.

The thin film transistor substrate 100 and the color filter substrate 200 are bonded by the seal 330.

Meanwhile, a gate driver 500 for outputting a gate driving signal for turning on or off the thin film transistor 125 is implemented on one side of the thin film transistor substrate 100. The gate driver 500 includes a plurality of thin film transistors. Since the thin film transistor, which is a switching element included in the gate driver 500, is also composed of the same amorphous silicon thin film transistor as the thin film transistor 125 included in the pixel, the thin film transistor can be manufactured by the same manufacturing process, and thus, the case of using the polysilicon thin film transistor The manufacturing process is much simplified.

In addition, the polarizer 420 is adhered to the bottom of the thin film transistor substrate 100 by the adhesive 410, and the polarizer 440 is adhered to the upper surface of the color filter substrate 200 by the adhesive 430. However, the adhesive 430 and the polarizer 440 formed on the upper surface of the color filter substrate 200 extend longer than the color filter substrate 200 to form a gate driver formed on the thin film transistor substrate 100 in the non-display area. 500). The polarizing plate 440 formed on the upper surface of the color filter substrate 100 is composed of a plurality of layers. For example, the polarizing plate 440 is a liquid crystal film of a polyvinyl alcohol (hereinafter referred to as PVA) in roll form. PVA sheet prepared by stretching the width of the long side length of the display panel 300 and cutting the short side length, the triacetyl cellulose film (hereinafter referred to as TAC) film provided on the upper and lower surfaces of the PVA sheet, and the upper and lower surfaces of the TAC film. It includes a protective film provided in, the plurality of layers are each bonded by an adhesive. One or more of the plurality of layers may be formed to extend with the adhesive to cover the gate driver 500 formed on the thin film transistor substrate 200 in the non-display area.

3 is an exploded perspective view of a liquid crystal display device including a liquid crystal display panel according to the present invention.

Referring to FIG. 3, a liquid crystal display including a liquid crystal display panel according to the present invention includes a liquid crystal display panel 1300, a backlight unit 2000 including a light source 1020 and a light guide plate 1000, and a backlight unit ( A mold frame 1100 for accommodating 1200, and an upper chassis 1400 for enclosing a predetermined region and a side portion of the liquid crystal display panel 1300 and the backlight unit 1200 are included.

The liquid crystal display panel 1300 includes a thin film transistor substrate 1310 having a gate driver formed in a predetermined region, a color filter substrate 1320 facing the thin film transistor substrate 1310, a thin film transistor substrate 1310 and a color filter substrate ( A liquid crystal layer (not shown) injected between the 1320 is included. In addition, the display device may further include a polarizing plate (not shown) formed corresponding to the upper portion of the color filter substrate 1320 and the lower portion of the thin film transistor substrate 1310, and the polarizing plate (not shown) formed on the color filter substrate 1320 is long. It is stretched to cover the gate driver (not shown) formed in the non-display area of the thin film transistor substrate 1310. Here, the color filter substrate 1320 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. On the opposite surface of the color filter substrate 1320, a common electrode (not shown) made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO), which is a transparent conductive thin film, is formed have.

The thin film transistor substrate 1310 is a transparent glass substrate in which a thin film transistor (TFT) and a pixel electrode are formed in a matrix form. Data lines are connected to source terminals of the thin film transistors, and gate lines are connected to gate terminals thereof. In addition, a pixel electrode (not shown) made of a transparent electrode made of a transparent conductive material is connected to the drain terminal. When the electrical signals are input to the data lines and the gate lines, the respective thin film transistors are turned on or turned off, and electrical signals necessary for pixel formation are applied to the drain terminals.

That is, as described above, when power is applied to the gate terminal and the source terminal of the thin film transistor substrate 1310 and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the cavity electrode of the color filter substrate 1320. Due to such an electric field, an arrangement of liquid crystals injected between the thin film transistor substrate 1310 and the color filter substrate 1320 is changed, and light transmittance is changed according to the changed arrangement to obtain a desired image.

The backlight unit is installed under the light guide 1020 that generates light, the light guide plate 1000 that guides the light generated by the light source 1020 to the liquid crystal display panel, and the light guide plate 1000 and leaks from the bottom surface of the light guide plate 1000. A reflection sheet 1050 reflecting the light emitted, a diffusion sheet 1210 installed on the light guide plate 1000 to uniformly diffuse the light emitted through the light guide plate 1000, and an upper portion of the diffusion sheet 1210. And first and second prism sheets 1220 and 1230 for condensing light diffused from the diffusion sheet 1210. A protective sheet (not shown) may be further formed on the second prism sheet 1230. The lower chassis 400 may further include a backlight unit 2000.

The mold frame 1100 is formed in a rectangular frame shape and includes a planar portion and sidewall portions bent at right angles therefrom. The mounting part may be formed on the flat part so that the liquid crystal display panel 1300 may be mounted. The seating part may use a fixing protrusion for contacting and aligning the edge side surfaces of the liquid crystal display panel 1300, respectively, or may be formed using a predetermined stepped step surface. Components of the backlight unit are fixed between the mold frame 1300 and the lower chassis 400.

The upper chassis 1400 is configured in the form of a rectangular window frame having a flat portion and sidewall portions bent at right angles therefrom. The planar portion of the upper chassis 1400 supports a portion of an edge of the liquid crystal display panel 1300 at a lower portion thereof, and the sidewall portion is coupled to face the sidewalls of the lower chassis 400.

As described above, according to the present invention, the adhesive and the polarizing plate formed on the upper surface of the color filter substrate are stretched to cover the gate driver formed in the non-display area of the thin film transistor substrate, thereby applying the same process depending on the model or size of the product. The production cost can be reduced because no separate coating material is used.

Claims (6)

A thin film transistor substrate including a gate line extending in one direction on the first substrate, a data line extending in a direction crossing the same, and a pixel electrode formed in the pixel region defined by the thin film transistor; A color filter substrate including a black matrix formed on a second substrate corresponding to a region other than the pixel region, a color filter formed corresponding to the pixel region, and a common electrode; A liquid crystal layer formed between the thin film transistor substrate and the color filter substrate; A gate driver formed in a predetermined region on the first substrate; And And a polarizer attached to an upper surface of the color filter substrate and extending to cover the gate driver. The liquid crystal display of claim 1, wherein the polarizing plate is attached to an upper surface of the color filter substrate by an adhesive. The liquid crystal display device of claim 1, wherein the polarizer is stretched together with the adhesive. The liquid crystal display of claim 1, wherein the polarizer includes a plurality of layers, and the plurality of layers are attached to each other by an adhesive, and at least one of the plurality of layers is stretched together with the adhesive below. The liquid crystal display of claim 1, wherein the gate driver is formed on the thin film transistor substrate in a non-display area. A liquid crystal display panel which stretches and covers a gate driver formed on a thin film transistor substrate in a non-display area, and which displays an image; And And a backlight unit for generating light and outputting the generated light to the liquid crystal display panel.

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