KR20080044632A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to form pixels such that the pixels have the same area to maintain kickback voltages of the pixels uniform and prevent decrease in an aperture ratio. An LCD includes a first substrate, a gate line(121) formed on the first substrate, a data line(171) intersecting the gate line, a pixel region defined by the gate line and the data line, a pixel electrode(191) disposed in the pixel region and provided with a video signal from the data line according to a signal of the gate line, a storage electrode line(131) which is superposed on the pixel electrode and has a main line arranged in parallel with the gate line and storage electrodes(133a,133b) connected to the main line, and a horizontal sensing data line(126) formed in a portion of the pixel region, which is not overlapped with the pixel electrode. The LCD further includes a vertical sensing data line(174) which is formed in a portion of the pixel region, which is not overlapped with the pixel electrode, and intersects the horizontal sensing data line, a second substrate opposite to the first substrate, a contact sensing protrusion formed on the first substrate and protruded to the horizontal sensing data line or the vertical sensing data line, and a common electrode formed on the contact sensing protrusion.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.

3 is an equivalent circuit diagram of a light sensing unit of a liquid crystal display according to an exemplary embodiment of the present invention.

4 is an equivalent circuit diagram of a touch sensing unit of a liquid crystal display according to an exemplary embodiment of the present invention.

5 is a schematic diagram of a liquid crystal display according to an exemplary embodiment of the present invention.

6 is a layout view of a thin film transistor according to an exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view of the liquid crystal display including the thin film transistor array panel of FIG. 6 taken along the line VII-VII. FIG.

8 is a layout view of a thin film transistor array panel constituting one dot according to an exemplary embodiment of the present invention.

9 is a layout view of a thin film transistor according to another exemplary embodiment of the present invention.

FIG. 10 is a cross-sectional view of the liquid crystal display including the thin film transistor array panel of FIG. 9 taken along the line X-X.

11 is a layout view of a thin film transistor array panel constituting one dot according to another exemplary embodiment of the present invention.

The present invention relates to a liquid crystal display device.

Typical liquid crystal displays (LCDs) among display devices include two display panels provided with pixel electrodes and a common electrode, and a liquid crystal layer having dielectric anisotropy interposed therebetween. The pixel electrodes are arranged in a matrix and connected to switching elements such as thin film transistors (TFTs) to receive image data voltages one by one. The common electrode is formed over the entire surface of the display panel and receives a common voltage. The pixel electrode, the common electrode, and the liquid crystal layer therebetween form a liquid crystal capacitor, and the liquid crystal capacitor becomes a basic unit that forms a pixel together with a switching element connected thereto.

In such a liquid crystal display, a voltage is applied to two electrodes to generate an electric field in the liquid crystal layer, and the intensity of the electric field is adjusted to adjust the transmittance of light passing through the liquid crystal layer to obtain a desired image. In this case, in order to prevent deterioration caused by an electric field applied to the liquid crystal layer for a long time, the polarity of the image data voltage with respect to the common voltage is inverted frame by frame, row by pixel, or pixel by pixel.

A touch screen panel is a device that touches a finger or a pen on the screen to write and draw characters or pictures, or executes icons to execute a desired command to a machine such as a computer. The liquid crystal display with a touch screen panel may find out whether the user's finger or a touch pen touches the screen and the contact position information.

However, in a liquid crystal display device having such a touch screen function, when a sensing signal line for determining whether a contact is overlapped on a pixel by a pressure applied from the outside, a potential of the pixel electrode is increased when a contact is applied to this area. Problem occurs.

In addition, when the pixel electrodes of the liquid crystal display including the touch sensing protrusion are formed to have the same horizontal and vertical sizes, the total aperture ratio is reduced by the space occupied by the touch sensing protrusion. In order to solve this problem, if the area of each pixel is different and the size of the thin film transistor is different, it is difficult to equalize the kickback voltage defined as follows, and thus DC residual afterimage defect may occur.

Therefore, the technical problem to be achieved by the present invention is to prevent the problem that the potential of the pixel electrode rises by the contact by the pressure from the outside.

In addition, the technical problem to be achieved by the present invention is to increase the aperture ratio while not causing the difference in the kickback voltage.

According to an embodiment of the present invention, a liquid crystal display device includes a first substrate, a gate line formed on the first substrate, a data line insulated from and intersecting the gate line, the gate line and the data line. A pixel region defined by the pixel region, a pixel electrode receiving an image signal from the data line according to a signal of the gate line, a pixel electrode overlapping the pixel electrode, and connected to a stem line parallel to the gate line and the stem line; A storage electrode line including a storage electrode, a horizontal sensing data line formed in a portion of the pixel region that is not overlapped with the pixel electrode, and formed in a portion of the pixel region and not overlapping the pixel electrode; Vertical sensing data intersecting the horizontal sensing data line And a second substrate facing the first substrate, a contact sensing protrusion formed on the first substrate and protruding toward the horizontal sensing data line or the vertical sensing data line, and formed on the touch sensing protrusion. An electrode.

The horizontal sensing data line may be formed between the pixel electrode and the gate line.

The vertical sensing data line may be formed between the pixel electrode and the data line.

The horizontal sensing data line or the vertical sensing data line may have a contact portion formed at a position in contact with the touch sensing protrusion.

The vertical sensing data line may have a contact portion formed at a position in contact with the touch sensing protrusion.

According to another exemplary embodiment of the present invention, a liquid crystal display device includes a plurality of gate lines and data lines that are insulated from each other and intersect with each other, a pixel area defined by the gate line and the data lines, and a pixel area. A plurality of pixel electrodes receiving an image signal from the data line according to the signal of the gate line, a plurality of horizontal sensing data lines formed in a portion of the pixel area that is not overlapped with the pixel electrodes, and a plurality of vertical sensing A thin film transistor array panel comprising a plurality of sensing signal lines including a data line, a plurality of storage electrode lines overlapping the pixel electrode, and a plurality of storage electrode lines including a stem line parallel to the gate line and a storage electrode connected to the stem line. The horizontal sensing data line or phase of A common electrode display panel including a plurality of touch sensing protrusions protruding toward the vertical sensing data line, and a liquid crystal layer formed between the thin film transistor array panel and the common electrode display panel, wherein the sensing signal line includes the touch sensing. The contact part is formed in the position which contact | connects the dragon protrusion part, The said contact part is formed only in one pixel of the pixel which comprises one dot, and the area of the pixel in which the said contact part was formed is the same as the area of the pixel in which the said contact part is not formed. .

The contact part may be formed on the pixel area.

The horizontal length of the pixel on which the contact portion is formed may be greater than the horizontal length of the pixel on which the contact portion is not formed.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

A liquid crystal display, which is an embodiment of a display device of the present invention, will now be described in detail with reference to the drawings.

1 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention, which is a block diagram of a liquid crystal display according to a pixel, and FIG. 2 is a pixel of the liquid crystal display according to the exemplary embodiment of the present invention. Equivalent circuit diagram. 3 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention, which is a block diagram of the liquid crystal display according to the sensing unit, and FIG. 4 is a pressure sensing unit of the liquid crystal display according to the exemplary embodiment of the present invention. 5 is a schematic diagram of a liquid crystal display according to an exemplary embodiment of the present invention.

1 and 3, a liquid crystal display according to an exemplary embodiment of the present invention may include a liquid crystal panel assembly 300, an image scanning unit 400, an image data driver 500, and a liquid crystal panel assembly 300 connected thereto. A sensing signal processor 800, a gray voltage generator 550 connected to the image data driver 500, a contact determiner 700 connected to the sensing signal processor 800, and a signal controller 600 for controlling them. .

1 to 4, the liquid crystal panel assembly 300 includes a plurality of display signal lines G ₁ -G _n , D ₁ -D _m and a plurality of pixels PX connected thereto and arranged in a substantially matrix form. ), and a plurality of sensing signal lines _{(SY 1 -SY N, SX 1} -SX M) and is connected thereto and comprises a plurality of sensing units (SU) are arranged in the form of a substantially matrix. 2 and 5, the liquid crystal panel assembly 300 includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, a liquid crystal layer 3 interposed therebetween, and two display panels. Spacer (not shown) which forms a gap between 100 and 200 and which is deformed to some extent is included.

The signal lines G ₁ -G _n and D ₁ -D _m are a plurality of image scanning lines G ₁ -G _n transmitting the image scanning signals and image data lines D ₁ -D _m transmitting the image data signals. It includes, and detection signal lines _{(SY 1 -SY N, SX 1} -SX M) detects a plurality of horizontal sensing data lines for transmitting a data signal (SY ₁ -SY _N) and a plurality of vertical sensing data line (SX ₁ -SX _M ).

The image scanning lines G ₁ -G _n and the horizontal sensing data lines SY ₁ -SY _N extend substantially in the row direction, are substantially parallel to each other, and the image data lines D ₁ -D _m and the vertical sensing data lines. (SX ₁ -SX _M ) extends approximately in the column direction and is substantially parallel to each other.

Switching connected to each pixel PX, for example, the i-th (i = 1, 2,, n) image scanning line G _i and the j-th (j = 1, 2,, m) image data line D _j The device Q includes a liquid crystal capacitor Clc and a storage capacitor Cst connected thereto. Holding capacitor Cst can be omitted as needed.

The switching element Q is a three-terminal element of a thin film transistor or the like provided in the thin film transistor array panel 100, the control terminal of which is connected to the image scanning line G _j , and the input terminal of the image data line D _j . The output terminal is connected to the liquid crystal capacitor Clc and the storage capacitor Cst. In this case, the thin film transistor includes amorphous silicon or poly crystalline silicon.

The liquid crystal capacitor Clc has two terminals, the pixel electrode 191 of the thin film transistor array panel 100 and the common electrode 270 of the common electrode display panel 200, and the liquid crystal layer 3 between the two electrodes 191 and 270. Functions as a dielectric. The pixel electrode 191 is connected to the switching element Q, and the common electrode 270 is formed on the entire surface of the common electrode display panel 200 and receives the common voltage Vcom. Unlike in FIG. 2, the common electrode 270 may be provided in the thin film transistor array panel 100. In this case, at least one of the two electrodes 191 and 270 may be linear or rod-shaped.

The storage capacitor Cst, which serves as an auxiliary role of the liquid crystal capacitor Clc, is formed by overlapping a separate signal line (not shown) and the pixel electrode 191 provided in the thin film transistor array panel 100 with an insulator interposed therebetween. A predetermined voltage such as the common voltage Vcom is applied to this separate signal line. However, the storage capacitor Cst may be formed such that the pixel electrode 191 overlaps the front end image scanning line directly above the insulator.

On the other hand, in order to implement color display, each pixel PX uniquely displays one of the primary colors (spatial division) or each pixel PX alternately displays the primary colors over time (time division). The desired color is recognized by the spatial and temporal sum of these primary colors. Examples of the primary colors include three primary colors such as red, green, and blue. As an example of spatial division, a color filter (not shown) representing one of the primary colors is formed above or below the pixel electrode 191 of the thin film transistor array panel 100, but each pixel PX is different from the pixel electrode. A color filter may be provided in an area of the common electrode display panel 200 corresponding to 191.

At least one polarizer (not shown) for polarizing light is attached to an outer surface of the liquid crystal panel assembly 300.

The sensing unit SU may have a structure shown in FIG. 4.

The sensing unit SU shown in FIG. 4 is a pressure sensing unit including a switch SWT connected to a horizontal or vertical sensing data line (hereinafter, referred to as a sensing data line) indicated by a reference numeral SL.

The switch SWT has two terminals, the common electrode 270 of the common electrode display panel 200 and the sensing data line SL of the thin film transistor array panel 100, and at least one of the two terminals protrudes to contact the user. The two terminals are connected physically and electrically. Accordingly, the common voltage Vcom from the common electrode 270 is output to the sensing data line SL as the sensing data signal.

As such, the Y coordinate of the contact point may be determined by analyzing the sensing data signal flowing through the horizontal sensing data line SY ₁ -SY _N , and the sensing data signal flowing through the vertical sensing data line SX ₁ -SX _M may be determined. Analysis can determine the X coordinate of the contact point.

Referring back to FIGS. 1 and 3, the gray voltage generator 550 generates two sets of gray voltage sets (or reference gray voltage sets) related to the transmittance of the pixel. One of the two sets has a positive value for the common voltage Vcom and the other set has a negative value.

The image scanning unit 400 is connected to the image scanning lines G ₁ -G _n of the liquid crystal panel assembly 300 to gate-on voltage Von for turning on the switching element Q, and gate-off voltage Voff for turning off. ) Is applied to the image scanning lines G ₁ -G _n .

The image data driver 500 is connected to the image data lines D ₁ -D _m of the liquid crystal panel assembly 300, and selects a gray voltage from the gray voltage generator 550 and uses the image data as the image data signal. Applies to lines D ₁ -D _m . However, when the gray voltage generator 550 provides only a predetermined number of reference gray voltages instead of providing all of the voltages for all grays, the image data driver 500 divides the reference gray voltages so that the grays for the whole grays are divided. Generates a voltage and selects an image data signal among them.

Detection signal processing section 800 is connected to the sensing of the liquid crystal panel assembly 300, a data line _{(SY 1 -SY N, SX 1} -SX M) detects the data line _{(SY 1 -SY N, SX 1} -SX M) to The sensing data signal output through the input signal is processed to generate a digital sensing signal DSN.

The touch determining unit 700 may be formed of a central processor unit (CPU) or the like, and receives the digital sensing signal DSN from the sensing signal processor 800 to determine whether or not the pressure sensing unit SU is in contact with each other.

The signal controller 600 controls operations of the image scanning unit 400, the image data driver 500, the gray voltage generator 550, and the detection signal processor 800.

Each of the driving devices 400, 500, 550, 600, 700, and 800 may be mounted directly on the liquid crystal panel assembly 300 in the form of at least one integrated circuit chip, or may be a flexible printed circuit film ( It may be mounted on the liquid crystal panel assembly 300 in the form of a tape carrier package (TCP) or mounted on a separate printed circuit board (not shown). Alternatively, these driving devices 400, 500, 550, 600, 700, and 800 are connected to signal lines G ₁ -G _n , D ₁ -D _m , SY ₁ -SY _N , SX ₁ -SX _M and thin film transistors ( Q) together with the liquid crystal panel assembly 300 may be integrated.

Referring to FIG. 5, the liquid crystal panel assembly 300 is divided into a display area P1, an edge area P2, and an exposure area P3. Most of the pixel PX, the sensing unit SU, and the signal lines G ₁ -G _n , D ₁ -D _m , SY ₁ -SY _N , and SX ₁ -SX _M are positioned in the display area P1. The common electrode display panel 200 includes the light blocking member 220, and the light blocking member 220 covers most of the edge area P2 to block light from the outside. Since the common electrode panel 200 is smaller than the thin film transistor array panel 100, a portion of the thin film transistor array panel 100 is exposed to form an exposed area P3, and a single chip 610 is mounted in the exposed area P3. A flexible printed circuit board 620 is attached.

The single chip 610 is a driving device for driving a liquid crystal display, that is, an image driver 400, an image data driver 500, a gray voltage generator 550, a signal controller 600, and a contact determiner ( 700, and a sensing signal processor 800. By integrating the driving devices 400, 500, 550, 600, 700, and 800 in a single chip 610, the mounting area may be reduced, and power consumption may be reduced. Of course, if desired, at least one of them or at least one circuit element constituting them may be outside the single chip 610.

The image signal lines G ₁ -G _n , D ₁ -D _m and the sensing data lines SY ₁ -SY _N , SX ₁ -SX _M extend to the exposure area P3 so that the corresponding driving devices 400, 500, 800 ).

The FPC board 620 receives a signal from an external device and transmits the signal to the single chip 610 or the liquid crystal panel assembly 300, and an end is usually formed of a connector (not shown) to facilitate connection with the external device. Next, an example of a liquid crystal display including a pressure sensing unit according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 6 is a layout view of a thin film transistor according to an exemplary embodiment, and FIG. 7 is a cross-sectional view of the liquid crystal display including the thin film transistor array panel of FIG. 6 taken along the line VII-VII. 8 is a layout view of a thin film transistor array panel constituting one dot according to an exemplary embodiment of the present invention.

As described above, the liquid crystal display according to the exemplary embodiment of the present invention includes the thin film transistor array panel 100, the common electrode display panel 200 facing the same, and the liquid crystal layer 3 injected therebetween.

Next, the thin film transistor array panel 100 will be described.

A plurality of gate lines 121, a plurality of horizontal sensing data lines 126, and a plurality of storage electrode lines 131 are formed on an insulating substrate 110 made of transparent glass or plastic.

The gate line 121 transmits a gate signal and mainly extends in a horizontal direction. Each gate line 121 includes a plurality of gate electrodes 124 protruding upward and end portions 129 having a large area for connection with another layer or an external driving circuit. At this time, part of the gate electrode 124 is chamfered. A gate driving circuit (not shown) for generating a gate signal is mounted on a flexible printed circuit film (not shown) attached to the substrate 110, or directly mounted on the substrate 110, or It may be integrated into the substrate 110. When the gate driving circuit is integrated on the substrate 110, the gate line 121 may extend to be directly connected to the gate driving circuit.

The horizontal sensing data line 126 transmits a sensing data signal and mainly extends in a horizontal direction. In this case, the horizontal sensing data line 126 passes over the pixel electrode 191 and is formed so as not to overlap the pixel electrode 191. The horizontal sensing data line 126 includes a contact portion 126a at a portion that is bent from the horizontal direction to the vertical direction. In addition, the horizontal sensing data line 126 may include a wide end portion (not shown) for connection with another layer or an external driving circuit.

Each storage electrode line 131 receives a predetermined voltage, and includes a stem line extending substantially in parallel with the gate line 121, and a plurality of pairs of first and second storage electrodes 133a and 133b separated therefrom. Each of the storage electrode lines 131 is positioned between two adjacent gate lines 121, and the stem line is closer to the lower side of the two gate lines 121. Each of the sustain electrodes 133a and 133b has a fixed end connected to the stem line and a free end opposite thereto. However, the shape and arrangement of the storage electrode line 131 may be modified in various ways. A predetermined voltage such as a common voltage applied to the common electrode of the common electrode display panel 200 of the liquid crystal display is applied to the sustain electrode line 131.

The gate line 121, the horizontal sensing data line 126, and the storage electrode line 131 may be formed of aluminum-based metal such as aluminum (Al) or aluminum alloy, silver-based metal such as silver (Ag) or silver alloy, copper (Cu), It may be made of copper-based metals such as copper alloys, molybdenum-based metals such as molybdenum (Mo) or molybdenum alloys, chromium (Cr), tantalum (Ta), and titanium (Ti). However, they may have a multilayer structure including two conductive films (not shown) having different physical properties. One of the conductive films is made of a metal having low resistivity, such as aluminum-based metal, silver-based metal, or copper-based metal, so as to reduce signal delay or voltage drop. In contrast, other conductive films are made of other materials, particularly materials having excellent physical, chemical, and electrical contact properties with indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metals, chromium, tantalum, and titanium. Good examples of such a combination include a chromium bottom film, an aluminum (alloy) top film, and an aluminum (alloy) bottom film and a molybdenum (alloy) top film. However, the gate line 121 and the storage electrode line 131 may be made of various other metals or conductors.

Side surfaces of the gate line 121 and the storage electrode line 131 are inclined with respect to the surface of the substrate 110, and the inclination angle is preferably about 30 ° to about 80 °.

A gate insulating layer 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate line 121, the horizontal sensing data line 126, and the storage electrode line 131.

On the gate insulating layer 140, a plurality of island semiconductors 154 made of hydrogenated amorphous silicon (amorphous silicon is abbreviated as a-Si), polycrystalline silicon, or the like are formed. The semiconductor 154 is positioned over the gate electrode 124.

A plurality of island type ohmic contacts 163 and 165 are formed on the semiconductor 154. The ohmic contacts 163 and 165 may be made of a material such as n + hydrogenated amorphous silicon in which n-type impurities such as phosphorus are heavily doped, or may be made of silicide. The ohmic contacts 163 and 165 are paired and disposed on the semiconductor 154.

Side surfaces of the semiconductor 154 and the ohmic contacts 163 and 165 are also inclined with respect to the surface of the substrate 110, and the inclination angle is about 30 ° to 80 °.

A plurality of data lines 171, a plurality of drain electrodes 175, and a plurality of vertical sensing data lines 174 are disposed on the ohmic contacts 163 and 165 and the gate insulating layer 140. Formed.

The data line 171 transmits a data signal and mainly extends in the vertical direction to cross the gate line 121. Each data line 171 includes a plurality of source electrodes 173 extending toward the gate electrode 124 and an end portion 179 having a large area for connection with another layer or an external driving circuit. A data driving circuit (not shown) for generating a data signal is mounted on a flexible printed circuit film (not shown) attached to the substrate 110, directly mounted on the substrate 110, or integrated in the substrate 110. Can be. When the data driving circuit is integrated on the substrate 110, the data line 171 may be extended to be directly connected to the data driving circuit.

The drain electrode 175 is separated from the data line 171 and faces the source electrode 173 around the gate electrode 124. Each drain electrode 175 includes one wide end including an extension 177 and the other end having a rod shape. The extension 177 overlaps the storage electrode line 131, and the rod-shaped end portion is partially surrounded by the bent source electrode 173.

One gate electrode 124, one source electrode 173, and one drain electrode 175 together with the protrusion 154 of the semiconductor 151 form one thin film transistor (TFT). A channel of the transistor is formed in the protrusion 154 between the source electrode 173 and the drain electrode 175.

The vertical sensing data line 174 transmits the sensing data signal and extends mainly in the vertical direction to be separated from the adjacent data line 171. In addition, the vertical sensing data line 174 passes along the side of the pixel electrode 191 and is formed so as not to overlap the pixel electrode 191. In addition, the vertical sensing data line 174 may include a wide extension 174a and may include a wide end portion (not shown) for connection with another layer or an external driving circuit.

The data line 171, the drain electrode 175, and the vertical sensing data line 174 are preferably made of a refractory metal such as molybdenum, chromium, tantalum, and titanium, or an alloy thereof. Not shown) and a low resistance conductive film (not shown). Examples of the multilayer structure include a double layer of chromium or molybdenum (alloy) lower layer and an aluminum (alloy) upper layer, a triple layer of molybdenum (alloy) lower layer and an aluminum (alloy) interlayer and molybdenum (alloy) upper layer. However, the data line 171, the drain electrode 175, and the vertical sensing data line 174 may be made of various metals or conductors.

The data line 171, the drain electrode 175, and the vertical sensing data line 174 may also be inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

The ohmic contacts 163 and 165 exist only between the semiconductor 154 thereunder and the data line 171 and the drain electrode 175 thereon to lower the contact resistance therebetween. The island-type semiconductor 154 has a portion exposed between the source electrode 173 and the drain electrode 175 and not covered by the data line 171 and the drain electrode 175.

The passivation layer 180 is formed on the data line 171, the drain electrode 175, and the exposed semiconductor 154. The passivation layer 180 is made of an inorganic insulator such as silicon nitride or silicon oxide.

The passivation layer 180 includes a plurality of contact holes 187 and 182 exposing the extension 177 of the drain electrode 175, the end 179 of the data line 171, and the extension 174a of the vertical sensing data line, respectively. 183a is formed, and a plurality of contact holes 181 and 183b are formed along with the gate insulating layer 140 to expose the end portion 129 of the gate line 121 and the contact portion 126a of the horizontal sensing data line.

The pixel electrode 191 is physically and electrically connected to the drain electrode 175 through the contact hole 187 and receives a data voltage from the drain electrode 175. The pixel electrode 191 to which the data voltage is applied generates an electric field together with a common electrode (not shown) of another display panel 200 to which a common voltage is applied, thereby creating a liquid crystal layer 3 between the two electrodes. Direction of the liquid crystal molecules (not shown). The polarization of light passing through the liquid crystal layer 3 varies according to the direction of the liquid crystal molecules determined as described above. The pixel electrode 191 and the common electrode (not shown) form a capacitor (hereinafter, referred to as a "liquid crystal capacitor") to maintain an applied voltage even after the thin film transistor is turned off.

The pixel electrode 191 and the drain electrode 175 connected thereto overlap the storage electrode line 131. A capacitor formed by the pixel electrode 191 and the drain electrode 175 electrically connected to the pixel electrode 191 overlapping the storage electrode line 131 is called a storage capacitor, and the storage capacitor enhances the voltage holding capability of the liquid crystal capacitor.

The contact auxiliary members 81 and 82 are connected to the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 through the contact holes 181 and 182, respectively. The contact auxiliary members 81 and 82 compensate for and protect the adhesion between the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 and the external device.

As illustrated in FIG. 8, in the thin film transistor array panel of the liquid crystal display according to the present invention, the pixels except for the pixel where the contact portion of the horizontal sensing data line and the vertical sensing data line are formed have a small horizontal axis length, and the horizontal sensing data The pixels in which the contact portions of the lines and the vertical sensing data lines are formed are formed to have a long horizontal axis so that the area of each pixel constituting one dot is the same. Each storage electrode line is formed to have the same length and the same area for each pixel.

The upper panel 200 facing the lower panel 100 may include a light blocking member, a plurality of column spacers, a plurality of contact sensing protrusions, a plurality of protective protrusions, and a plurality of insulating substrates on an insulating substrate made of transparent glass or plastic. Color filter 230, a common electrode, and the like are formed. The common voltage Vcom is applied to the common electrode. In this case, an overcoat made of an (organic) insulator may be formed under the common electrode 270 to protect the color filter and prevent the color filter from being exposed.

An alignment layer (not shown) is applied on the inner surfaces of the display panels 100 and 200, and one or more polarizers (not shown) are disposed on the outer surfaces of the display panels 100 and 200. Not included).

The liquid crystal display may further include a sealant (not shown) that couples the lower panel 100 and the upper panel 200. The encapsulant is positioned at an edge of the upper panel 200.

A liquid crystal layer (not shown) is included between the lower panel 100 and the upper panel 200, and the two panels 100 and 200 are supported by a plurality of column spacers.

By forming the liquid crystal display device in this manner to make the area of each pixel the same and the area of the sustain electrode line for each pixel to be the same, the kickback contact pressure for each pixel can be kept the same, and the reduction of the aperture ratio can be prevented. In addition, since the sensing signal line does not overlap the pixel electrode, a problem caused by external contact can be prevented.

FIG. 9 is a layout view of a thin film transistor according to another exemplary embodiment. FIG. 10 is a cross-sectional view of the liquid crystal display including the thin film transistor array panel of FIG. 9 taken along the line X-X. 11 is a layout view of a thin film transistor array panel constituting one dot according to another exemplary embodiment of the present invention.

As shown in FIGS. 9 and 10, the thin film transistor array panel according to another exemplary embodiment of the present invention may include a pixel electrode 191 and a front gate line 127 directly above the insulator such as the gate insulating layer 140. Overlapping to form a holding capacitor (Cst).

In addition, as illustrated in FIG. 11, in the thin film transistor array panel of the liquid crystal display, the pixels except for the pixel where the contact portion of the horizontal sensing data line and the vertical sensing data line are formed have a small length of the horizontal axis, and the horizontal sensing data line and the vertical The pixels on which the contact portions of the sensing data lines are formed are formed to have a long horizontal axis so that the area of each pixel is the same. Each storage electrode line is formed to have the same length and the same area for each pixel.

As described above, when the liquid crystal display is formed to make the area of each pixel the same and the area of the sustain electrode line for each pixel to be the same, the kickback contact pressure for each pixel can be maintained the same, and the aperture ratio can be prevented from being reduced. In addition, since the sensing signal line does not overlap the pixel electrode, a problem caused by external contact can be prevented.

Meanwhile, in the exemplary embodiment of the present invention, the liquid crystal display is described as a display device, but the present invention is not limited thereto, and the same may be applied to a display device such as a plasma display device and an organic light emitting display. Can be.

According to the present invention, the kickback contact pressure for each pixel can be kept the same by making the area of each pixel the same, and the reduction of the aperture ratio can be prevented. In addition, since the sensing signal line does not overlap the pixel electrode, a problem caused by external contact can be prevented.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (8)

First substrate, A gate line formed on the first substrate, A data line insulated from and intersecting the gate line, A pixel region defined by the gate line and the data line, A pixel electrode positioned in the pixel region and receiving an image signal from the data line according to a signal of the gate line; A storage electrode line overlapping the pixel electrode and including a stem line parallel to the gate line and a storage electrode connected to the stem line; A horizontal sensing data line formed in the pixel area and formed in a portion which does not overlap the pixel electrode; A vertical sensing data line formed in the pixel area and not overlapping with the pixel electrode and intersecting the horizontal sensing data line; A second substrate facing the first substrate, A contact sensing protrusion formed on the first substrate and protruding toward the horizontal sensing data line or the vertical sensing data line, and The common electrode formed on the contact sensing protrusion Liquid crystal display comprising a. In claim 1, And the horizontal sensing data line is formed between the pixel electrode and the gate line. In claim 1, And the vertical sensing data line is formed between the pixel electrode and the data line. In claim 1, And the contact portion is formed at a position where the horizontal sensing data line or the vertical sensing data line is in contact with the touch sensing protrusion. In claim 1, And the contact portion is formed at a position where the vertical sensing data line is in contact with the touch sensing protrusion. A plurality of gate lines and data lines insulated from and crossing each other, a pixel area defined by the gate line and the data line, and a plurality of pixels positioned in the pixel area and receiving an image signal from the data line according to a signal of the gate line A plurality of sensing signal lines including a plurality of horizontal sensing data lines and a plurality of vertical sensing data lines formed in an electrode, the pixel region and not overlapping the pixel electrode, and overlapping the gate electrode with the gate electrode; A thin film transistor array panel including a plurality of storage electrode lines including a stem line parallel to a line and a storage electrode connected to the stem line; A common electrode display panel including a plurality of touch sensing protrusions protruding toward the horizontal sensing data line or the vertical sensing data line of the thin film transistor array panel, and A liquid crystal layer formed between the thin film transistor array panel and the common electrode display panel; The sensing signal line has a contact portion formed at a position in contact with the touch sensing protrusion, And the contact portion is formed in only one pixel among pixels constituting one dot, and an area of a pixel in which the contact portion is formed is equal to an area of a pixel in which the contact portion is not formed. In claim 6, And the contact portion is formed above the pixel area. In claim 6, The horizontal length of the pixel on which the contact portion is formed is greater than the horizontal length of the pixel on which the contact portion is not formed.

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