KR20070083002A - Display device - Google Patents

Abstract

A display device is provided to sense a sound wave by means of an upper substrate and to reduce the area occupied by a microphone. A display panel(300) has plural pixels and displays an image. A gate driving member(400) supplies the scan signal to the pixel. A data driving member(500) supplies the data signal to the pixel. A sensing capacitor is formed at the display panel. The capacitance of the sensing capacitor is changed along the sound wave. A sensing signal processing member(800) receives and processes the sensing signal corresponding to the change of the capacitance. The display panel comprises a lower substrate. A transistor is formed on the lower substrate. A pixel electrode is electrically connected with the transistor. A sensing electrode is separated from a pixel electrode and forms the sensing capacitor. A common electrode is located oppositely to the pixel and sensing electrodes and receives the common voltage. An upper substrate has plural color filters and is located oppositely to the lower substrate.

Description

Display device {DISPLAY DEVICE}

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

2 is a circuit diagram of a detector according to an embodiment of the present invention.

3 is a layout view of a liquid crystal display according to an exemplary embodiment of the present invention.

4 and 5 are cross-sectional views of the liquid crystal display of FIG. 3 taken along lines IV-IV and V-V.

The present invention relates to a liquid crystal display device.

In recent years, with the reduction in weight and thickness of personal computers and televisions, display devices are also required to be lighter and thinner, and cathode ray tubes (CRTs) are being replaced by flat panel displays.

Such flat panel displays include liquid crystal displays (LCDs), field emission displays (FEDs), organic light emitting displays, plasma display panels (PDPs), and the like. There is this.

In general, in an active matrix flat panel display, a plurality of pixels are arranged in a matrix form, and an image is displayed by controlling the light intensity of each pixel according to given luminance information. Among them, the liquid crystal display includes two display panels including a pixel electrode and a common electrode, and a liquid crystal layer having dielectric anisotropy interposed therebetween. The liquid crystal display device applies an electric field to the liquid crystal layer, and adjusts the intensity of the electric field to adjust the transmittance of light passing through the liquid crystal layer to obtain a desired image.

Recently, the demand for medium- and small-sized liquid crystal displays is continuously increasing due to the increase in demand for mobile communication and multimedia devices. In particular, the mobile communication device includes a display area, a speaker, a keypad, a microphone, and the like for data transmission between a user and the device, and a wide display area is particularly required.

However, since the display area, the microphone, the speaker, the keypad, and the like must all be exposed to the outside of the mobile communication device, the size of the mobile communication device is limited, and the size of the display area is also limited by the space of other devices.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of maximally securing a display area.

According to an exemplary embodiment of the present invention, a display device including a plurality of pixels, a display panel displaying an image, a gate driver supplying a scan signal to the pixels, and a data supplying data signals to the pixels are provided. A driving unit, a sensing capacitor formed on the display panel, the capacitance of which changes according to sound waves, and a sensing signal processor configured to receive and process a sensing signal corresponding to the change of the capacitance of the sensing capacitor.

The display panel may include a lower substrate, a transistor formed on the lower substrate, a pixel electrode electrically connected to the transistor, and a sensing electrode separated from the pixel electrode to form the sensing capacitor, the pixel electrode, and the sensing electrode. And an upper substrate facing the liquid crystal layer, and having a common electrode supplied with a common voltage, and a plurality of color filters, facing the lower substrate.

The sensing electrode may be formed of the same layer as the pixel electrode.

The upper substrate may include a light blocking member between the plurality of color filters.

The sensing electrode may be formed in an area facing the light blocking member.

The sensing electrode may receive the common voltage and the DC voltage.

The display panel may include a resistor for transmitting the sensing signal to the sensing signal processor.

The resistor may be an active device.

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 display device according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

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

As shown in FIG. 1, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel assembly 300, a gate driver 400, a data driver 500, and a sensing signal connected thereto. The processor 800 includes a gray voltage generator 550 connected to the data driver 500, and a signal controller 600 for controlling the gray voltage generator 550.

The liquid crystal panel assembly 300, when viewed as an equivalent circuit, 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 sensing units connected to the plurality of sensing data lines M ₁ -M _k .

The display signal lines G ₁ -G _n and D ₁ -D _m are a plurality of gate lines G ₁ -G _n transmitting scan signals and a plurality of image data lines D ₁ -D _m transferring data signals. It includes.

The sensing data lines M ₁ -Mk are formed in the row and column directions of the liquid crystal panel assembly 300 and form a mesh on the display panel.

The gate lines G ₁ -G _n extend substantially in the row direction and are substantially parallel to each other, and the image data lines D ₁ -D _m extend substantially in the column direction and are substantially parallel to each other.

2 is a circuit diagram of a detector according to an embodiment of the present invention.

2, a sensing unit according to an embodiment of the present invention includes a sensing capacitor Cm and a resistor R.

The sensing capacitor Cm has two terminals, a sensing electrode supplied with a direct current voltage Vdc and a common voltage Vcom, and a common electrode supplied with a common voltage Vcom, and a liquid crystal layer between the two terminals is used as a dielectric. . The common electrode is formed on an upper substrate made of a material sensitive to sound waves, and outputs an alternating current according to sound waves to the resistor R.

The resistor R is connected between the common electrode of the sensing capacitor Cm and the amplifier Amp of the sensing signal processor 800 to transfer a sensing signal of voltage to the amplifier Amp of the sensing signal processor 800. do. The resistor R may be a line resistor or a separate resistor may be formed using an active element.

The sensing unit and the amplifying unit Amp of the sensing signal processor 800 may operate as a micro to recognize and amplify sound waves and convert them into electrical signals.

Hereinafter, the display panel 300 in which the pixel PX and the sensing unit are formed will be described in detail.

3 is a layout view of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 4 is a cross-sectional view of the liquid crystal display of FIG. 3 taken along line IV-IV, and FIG. 5 is a view of the liquid crystal display of FIG. 3. It is sectional drawing cut along the VV line.

A plurality of gate lines 121 and a plurality of storage electrode lines 131 are formed on a lower insulating substrate 110 made of transparent glass or plastic.

The gate line 121 transmits a scan signal and mainly extends in a horizontal direction. Each gate line 121 includes a plurality of gate electrodes 124 protruding downward and an end portion 129 having a large area for connection with another layer or an external driving circuit.

The gate driver 400 generating the scan signal may be directly mounted on the substrate 110 and mounted on a flexible printed circuit film (not shown) attached to the substrate 110. 110 may be integrated.

The 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. The fixed end of the first sustain electrode 133a has a large area, and its free end is divided into two parts, a straight portion and a bent portion. However, the shape and arrangement of the storage electrode line 131 may be modified in various ways.

The gate line 121 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-based metal such as copper (Cu) or copper alloy, or molybdenum ( It may be made of molybdenum-based metal such as Mo) or molybdenum alloy, 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 30-80 °.

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

A plurality of linear semiconductors 151 made of hydrogenated amorphous silicon (hereinafter referred to as a-Si) or polysilicon are formed on the gate insulating layer 140. The linear semiconductor 151 mainly extends in a vertical direction and includes a plurality of projections 154 extending toward the gate electrode 124. The linear semiconductor 151 has a wider width in the vicinity of the gate line 121 and the storage electrode line 131 and covers them widely.

A plurality of linear and island ohmic contacts 161 and 165 are formed on the semiconductor 151. The ohmic contacts 161 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 linear ohmic contact 161 has a plurality of protrusions 163, and the protrusion 163 and the island-type ohmic contact 165 are paired and disposed on the protrusion 154 of the semiconductor 151.

Side surfaces of the semiconductor 151 and the ohmic contacts 161 and 165 are also inclined with respect to the surface of the substrate 110, and the inclination angle is about 30-80 °.

A plurality of data lines 171 and a plurality of drain electrodes 175 are formed on the ohmic contacts 163 and 165 and the gate insulating layer 140.

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 also crosses the storage electrode line 131 and runs between adjacent sets of storage electrodes 133a and 133b. 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 driver (not shown) for generating a data signal may be mounted on a flexible printed circuit film (not shown) attached to the substrate 110, mounted directly on the substrate 110, or integrated into the substrate 110. Can be. When the data driver is integrated on the substrate 110, the data line 171 may be extended to be directly connected to the data driver 171.

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 and the other end having a rod shape. The wide end portion 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 a thin film transistor (TFT), which is one switching element. The channel of the thin film transistor is formed in the protrusion 154 between the source electrode 173 and the drain electrode 175.

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

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

The ohmic contacts 161 and 165 exist only between the semiconductor 151 below and the data line 171 and the drain electrode 175 thereon, and lower the contact resistance therebetween. Although the linear semiconductor 151 is narrower than the data line 171 in most places, as described above, the width of the linear semiconductor 151 is widened at the portion where it meets the gate line 121 to smooth the profile of the surface, thereby disconnecting the data line 171. prevent. The semiconductor 151 has an exposed portion between the source electrode 173 and the drain electrode 175, and not covered by the data line 171 and the drain electrode 175.

A passivation layer 180 is formed on the data line 171, the drain electrode 175, and the exposed semiconductor 151. The passivation layer 180 may be made of an inorganic insulator or an organic insulator, and may have a flat surface. Examples of the inorganic insulator include silicon nitride and silicon oxide. The organic insulator may have photosensitivity and the dielectric constant is preferably about 4.0 or less. However, the passivation layer 180 may have a double layer structure of the lower inorganic layer and the upper organic layer so as not to damage the exposed portion of the semiconductor 151 while maintaining excellent insulating properties of the organic layer.

In the passivation layer 180, a plurality of contact holes 182 and 185 exposing the end portion 179 and the drain electrode 175 of the data line 171 are formed, respectively, and the passivation layer 180 and the gate insulating layer are formed. A plurality of contact holes 183a exposing a part of the storage electrode lines 131 near the fixed end of the first storage electrode 133a and a plurality of contact holes exposing protrusions of the free ends of the first storage electrode 133a (140). 183b is formed, and a plurality of contact holes 181 exposing the end portion 129 of the gate line 121 are formed.

A plurality of pixel electrodes 191, a plurality of sensing electrodes 196, a plurality of overpasses 84, and a plurality of contact assistants 82 are formed on the passivation layer 180. It is. These may be made of a transparent conductive material such as ITO or IZO, or may be made of a reflective metal such as aluminum, silver, chromium or an alloy thereof.

The pixel electrode 191 is physically and electrically connected to the drain electrode 175 through the contact hole 185 and receives a data voltage from the drain electrode 175. The pixel electrode 191 to which the data voltage is applied is generated between the two electrodes 191 and 270 by generating an electric field together with the common electrode 270 of the other display panel 200 to which the common voltage is applied. The direction of liquid crystal molecules (not shown) of the liquid crystal layer 3 is determined. 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 sensing electrode 196 is separated from the pixel electrode 19, and overlaps with the gate line 121 and the data line 171 to form a network.

The pixel electrode 191 and the common electrode 270 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 overlaps the storage electrode line 131 including the storage electrodes 133a and 133b. A capacitor in which the pixel electrode 191 and the drain electrode 175 electrically connected thereto overlap with 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 82 are connected to the end portions 179 of the data lines 171 through the contact holes 182, respectively. The contact assisting member 82 compensates for and protects the adhesion between the end portion 179 of the data line 171 and the external device. The connection leg 84 crosses the gate line 121 and exposes the exposed portion of the storage electrode line 131 and the storage electrode through contact holes 183a and 183b positioned opposite to each other with the gate line 121 interposed therebetween. 133b) is connected to the exposed end of the free end. The sustain electrode lines 131 including the sustain electrodes 133a and 133b may be used together with the connecting legs 84 to repair defects in the gate line 121, the data line 171, or the thin film transistor.

Next, the color filter display panel 200 will be described.

A light blocking member 220 is formed on an insulating substrate 210 made of transparent glass, plastic, or the like. The insulating substrate 210 may be a material that is sensitive to sound waves and easily vibrates. The light blocking member 220 is also called a black matrix and prevents light leakage. The light blocking member 220 faces the sensing electrode 196, has a plurality of openings having substantially the same shape as the pixel electrode 191, and blocks light leakage between the pixel electrodes 191. However, the light blocking member 220 may include a portion corresponding to the gate line 121 and the data line 171 and a portion corresponding to the thin film transistor.

A plurality of color filters 230 is also formed on the substrate 210. The color filter 230 is mostly present in an area surrounded by the light blocking member 220, and may extend in the vertical direction along the column of the pixel electrodes 191. Each color filter 230 may display one of primary colors such as three primary colors of red, green, and blue.

An overcoat 250 is formed on the color filter 230 and the light blocking member 220. The overcoat 250 may be made of an (organic) insulator, which prevents the color filter 230 from being exposed and provides a flat surface. The overcoat 250 may be omitted.

The common electrode 270 is formed on the overcoat 250. The common electrode 270 may be made of a transparent conductor such as ITO or IZO.

The sensing electrode 960 and the common electrode 270 overlap the liquid crystal layer 3 with a dielectric to form the sensing capacitor Cm.

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. FIG. 3 illustrates that each pixel PX includes a color filter 230 representing one of the primary colors in an area of the upper panel 200 corresponding to the pixel electrode 191 as an example of spatial division. Unlike in FIG. 3, the color filter 230 may be formed above or below the pixel electrode 191 of the lower panel 100.

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

The gate driver 400 is connected to the gate lines G ₁ -G _n of the liquid crystal panel assembly 300 to scan signals formed by a combination of a high voltage Von for turning on the switching element and a low voltage Voff for turning off the switching element. It is applied to the gate lines G ₁ -G _n .

The 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 line as a data signal. D ₁ -D _m ).

The sensing signal processor 800 includes an amplifier Amp and receives a sensing signal from the sensing signal lines M ₁ -M _k connected to the resistor R to process signals such as amplification and analog-digital conversion.

The signal controller 600 controls the gate driver 400, the data driver 500, the sensing signal processor 800, and the like.

Each of the driving devices 400, 500, 550, 600, 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 (not shown). 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). In contrast, these driving devices 400, 500, 550, 600, and 800 have a liquid crystal panel assembly with signal lines G ₁ -G _n , D ₁ -D _m , M ₁ -M _k , and switching elements Q. It may be integrated at 300. In addition, the driving devices 400, 500, 550, 600, and 800 may be integrated into a single chip, in which case at least one of them or at least one circuit element constituting them may be outside the single chip.

Next, the operation of the liquid crystal display will be described in detail.

The signal controller 600 receives input image signals R, G, and B and an input control signal for controlling the display thereof from an external graphic controller (not shown). The input control signal includes a vertical sync signal Vsync, a horizontal sync signal Hsync, a main clock MCLK, a data enable signal DE, and the like.

The signal controller 600 applies the input image signals R, G, and B to the operating conditions of the liquid crystal panel assembly 300 and the data driver 500 based on the input image signals R, G, and B and the input control signal. After the processing is performed properly, the gate control signal CONT1, the data control signal CONT2, the sensing data control signal CONT3, and the like are generated, the gate control signal CONT1 is sent to the gate driver 400, and the data control signal ( CONT2) and the processed image signal DAT are sent to the data driver 500. In addition, the sensing control signal CONT3 is sent to the sensing signal processing unit 800, respectively.

The gate control signal CONT1 includes a scan start signal STV indicating a scan start and at least one clock signal controlling an output period of the high voltage Von. The gate control signal CONT1 may also further include an output enable signal OE that defines the duration of the first high voltage Von.

The data control signal CONT2 is a load signal LOAD for applying a video data signal to the horizontal synchronization start signal STH and the video data lines D ₁ -D _m indicating the start of the transmission of the group of video data DAT. The data clock signal HCLK is included. The data control signal CONT2 also inverts the voltage polarity of the image data signal relative to the common voltage Vcom (hereinafter referred to as "polarity of the image data signal" by reducing the "voltage polarity of the image data signal with respect to the common voltage"). It may further include an inversion signal RVS.

According to the data control signal CONT2 from the signal controller 600, the data driver 500 receives the digital image signal DAT for the group of pixels PX, and converts the digital image signal DAT into an analog data signal. After conversion to, apply it to the corresponding image data line D ₁ -D _m .

The gate driver 400 applies the first high voltage Von to the gate lines G ₁ -G _n in response to the gate control signal CONT1 from the signal controller 600, thereby applying the gate lines G ₁ -G _n . Turn on the switching element connected to. Then, the data signal applied to the image data lines D ₁ -D _m is applied to the pixel PX through the turned-on switching element.

The difference between the voltage of the data signal applied to the pixel PX and the common voltage Vcom is shown as the charging voltage of the liquid crystal capacitor Clc, that is, the pixel voltage. The arrangement of the liquid crystal molecules varies according to the magnitude of the pixel voltage, thereby changing the polarization of light passing through the liquid crystal layer 3. The change in polarization is represented as a change in the transmittance of light by the polarizer attached to the liquid crystal panel assembly 300, and thus a desired image may be displayed.

Repeat this process in units of one horizontal period (also referred to as "1H" and equal to one period of the horizontal sync signal Hsync and the data enable signal DE) to thereby repeat all scan lines G ₁ -G _n . The first high voltage Von is sequentially applied to, and the image data signal is applied to all the pixels PX to display an image of one frame.

When one frame ends, the next frame starts and the state of the inversion signal RVS applied to the data driver 500 is controlled such that the polarity of the image data signal applied to each pixel PX is opposite to the polarity of the previous frame. (“Invert frame”). In this case, the polarity of the data signal flowing through one data line is changed according to the characteristics of the inversion signal (RVS) (eg, inverted row and inverted point) within one frame, or the polarity of the data signal applied to one pixel row is also different from each other. (Eg: nirvana, point inversion).

Next, the sound wave detection operation of the liquid crystal display will be described in detail.

When the user transmits sound waves such as voice toward the liquid crystal display, the upper substrate 210 sensitive to sound waves vibrates easily according to the sound waves. Accordingly, the common electrode 270 formed on the insulating substrate 210 also vibrates, and the distance between the common electrode 270 that is both electrodes of the sensing capacitor Cm and the sensing electrode 196 is changed, so that the sensing capacitor Cm Capacitance changes. As the capacitance of the sensing capacitor Cm changes, an alternating current flows through the resistance R according to the change of the charge of the sensing capacitor Cm.

Accordingly, an AC voltage corresponding to an AC current is set at both ends of the resistor R, and the AC voltage is output as a detection signal. The detection signal processor 800 performs signal processing such as amplifying the alternating AC voltage with respect to the DC voltage Vdc. Since the sensing capacitor Cm may operate as a capacitor of a condenser microphone, a liquid crystal display having a microphone may be implemented.

As described above, according to the present invention, by sensing and amplifying sound waves using an upper substrate sensitive to sound waves, the liquid crystal display including the microphone can reduce the area occupied by the microphone, thereby securing the display area.

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)

A display panel having a plurality of pixels and displaying an image, A gate driver supplying a scan signal to the pixel; A data driver supplying a data signal to the pixel; A sensing capacitor formed on the display panel, the capacitance of which changes according to sound waves, and A sensing signal processor configured to receive and process a sensing signal corresponding to a change in the capacitance of the sensing capacitor Display device comprising a. In claim 1, The display panel, Bottom substrate, A transistor formed on the lower substrate, A pixel electrode electrically connected to the transistor, A sensing electrode which is separated from the pixel electrode and forms the sensing capacitor, A common electrode facing the pixel electrode, the sensing electrode, and a liquid crystal layer, and receiving a common voltage; and An upper substrate having a plurality of color filters and facing the lower substrate Display device comprising a. In claim 2, And the sensing electrode is formed of the same layer as the pixel electrode. In claim 3, The upper substrate includes a light blocking member between the plurality of color filters. In claim 4, The sensing electrode is formed in an area facing the light blocking member. In claim 5, The sensing electrode receives the common voltage and the DC voltage. In claim 6, The display panel includes a resistor for transmitting the sensing signal to the sensing signal processor. In claim 7, And the resistor is an active element.

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