KR20070044989A - Liquid crystal display - Google Patents

Abstract

The present invention relates to a liquid crystal display device, comprising: a plurality of first display signal lines, a plurality of second display signal lines crossing the first display signal line, a plurality of sensing lines parallel to the second display signal line, and the first display display line A plurality of switching elements connected to one of the second display signal lines and one of the second display signal lines, a pixel electrode connected to the switching elements, a plurality of sensing units respectively connected to one of the plurality of sensing lines, and the first and the second electrodes. And a liquid crystal panel disposed at two display signal lines, spaced apart from the sensing line, the pixel, and the sensing unit, and having at least one inspection line for transmitting an inspection signal to the second display signal line. And a test pad receiving a test signal from the test pad, wherein each sensing line is connected to an adjacent second display signal line. Therefore, the VI test of the pixel is performed by applying an inspection signal through the inspection line without attaching the image data driver, and the VI inspection of the detection unit is performed by connecting the second display signal line and the inspection line, thereby reducing manufacturing cost and a defective rate.

Display, Sensor, Pixel, Sensor, Optical Sensor, VI Inspection, Liquid Crystal Display

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

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 the liquid crystal display shown in terms of a pixel.

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 a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention, which is a block diagram of an example of the liquid crystal display shown in terms of a sensing unit.

4A and 4B are exemplary equivalent circuit diagrams for the sensing unit of the liquid crystal display shown in FIG. 3, respectively.

5 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention, and is a block diagram of another example of the liquid crystal display shown in terms of a sensing unit.

 6A and 6B are exemplary equivalent circuit diagrams for the sensing unit of the liquid crystal display shown in FIG. 5, respectively.

FIG. 7 is an equivalent circuit diagram of a liquid crystal panel assembly for VI inspection of the sensing unit shown in FIG. 4A, according to an embodiment of the present invention.

FIG. 8 is an equivalent circuit diagram of a liquid crystal panel assembly for VI inspection of the sensing unit shown in FIG. 6A according to another embodiment of the present invention.

9 is a partial layout view of a portion of the lower panel on which an inspection line and an inspection pad are formed according to an exemplary embodiment of the present invention.

FIG. 10 is a cross-sectional view of the lower panel of FIG. 9 taken along the line X-X.

The present invention relates to a liquid crystal display device.

Representative liquid crystal displays (LCDs) of the display devices include lower and upper display panels each having a pixel electrode 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 data voltages one by one in sequence. 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.

A touch screen panel is a device that touches a finger or a touch pen (stylus) on the screen to write and draw letters or pictures, or execute icons to perform a desired command on a machine such as a computer. Say. A liquid crystal display with a touch screen panel may find out whether a user's finger or a touch pen touches the screen and contact position information. However, such a liquid crystal display device has problems such as a cost increase due to a touch screen panel, a decrease in yield due to a process of adhering the touch screen panel to a liquid crystal panel assembly, a decrease in brightness of the liquid crystal panel assembly, and an increase in product thickness.

Therefore, in order to solve these problems, a technology for embedding a sensing element in a liquid crystal display device instead of a touch screen panel has been developed. The sensing element detects a change in light or pressure applied to a screen by a user's finger or the like so that the liquid crystal display may determine whether the user's finger or the like has touched the screen and contact position information.

On the other hand, a VI (visual inspection) test for inspecting the operation of the sensing element built in the liquid crystal display device is to be performed, and a plurality of integrated circuit (IC) chips for controlling the operation of the liquid crystal display device and the driving IC chip. After fabricating the liquid crystal panel assembly to which both the mounted flexible printed circuit (FPC) substrate and the polarizer were attached, the operation of the sensing element was examined.

For this reason, when the sensing element does not operate normally, not only the liquid crystal panel assembly in which the lower and upper display panels are assembled, but also a plurality of driving ICs attached thereon cannot be used, resulting in a problem of cost waste.

Therefore, the technical problem to be achieved by the present invention is to reduce the waste of cost due to the failure of the sensing element.

According to an embodiment of the present invention, a plurality of first display signal lines, a plurality of second display signal lines intersecting the first display signal line, and a plurality of parallel lines with the second display signal line are provided. A plurality of sensing elements connected to one of a sensing line, one of the first display line and one of the second display signal lines, respectively, a plurality of sensing elements connected to one of the plurality of switching elements, the pixel electrode connected to the switching element, and the plurality of sensing lines, respectively. And a liquid crystal panel that is spaced apart from the first and second display signal lines, the sensing line, the pixel, and the sensing unit, and has at least one inspection line for transmitting an inspection signal to the second display signal line. The test line may include a test pad receiving a test signal from an external device, and each sensing line is connected to an adjacent second display signal line.

Preferably, the inspection line includes first and second inspection lines, and the first inspection line is connected to an odd-numbered display signal line among the second display signal lines.

The liquid crystal panel may further include an image scanning unit connected to the first display signal line.

The sensing unit may include a variable capacitor and a reference capacitor connected to the sensing line. In this case, the liquid crystal panel preferably further includes an initialization circuit and an amplifier connected to the sensing lines, respectively.

The sensing unit may be an optical sensor.

Preferably, the inspection line is made of the same layer as the first display signal line.

Preferably, the inspection line includes a plurality of extension parts, and the second signal display line is connected to the sensing line through each of the extension parts.

Each of the extension parts may be made of the same layer as the second display signal line or the sensing line.

The display device may further include a connection member made of the same layer as the pixel electrode, and each of the extension parts may be connected to the inspection line through the connection member.

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 example of a display device according to an exemplary embodiment, will now be described in detail with reference to FIGS. 1 to 5B.

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 an example of the liquid crystal display shown in terms of a sensing unit, and FIGS. 4A and 4B are liquid crystals shown in FIG. 3, respectively. An exemplary equivalent circuit diagram of a sensing unit of a display device is shown. 5 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention, which is a block diagram of another example of the liquid crystal display shown in terms of a sensing unit, and FIGS. 6A and 6B are liquid crystals shown in FIG. 5, respectively. An exemplary equivalent circuit diagram of a sensing unit of a display device is shown.

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 4B, 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, RL) and is connected thereto and comprises a plurality of sensing units (SU) are arranged in the form of a substantially matrix. 2, the liquid crystal panel assembly 300 includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other and a liquid crystal layer 3 interposed therebetween.

The display signal lines G ₁ -G _n and D ₁ -D _m are a plurality of image scanning lines G ₁ -G _n for transmitting an image scanning signal and an image data line D ₁ -D _m for transmitting an image data signal. sensing a signal line, comprising a _{(SY 1 -SY N, SX 1} -SX M, RL) includes a plurality of horizontal sensing data lines for transmitting the detected data signal (SY ₁ -SY _N) and a plurality of vertical sensing data line (SX ₁ -SX _M ) and a plurality of reference voltage lines RL for transmitting a reference voltage. The reference voltage line RL may be omitted as necessary.

The image scanning lines G ₁ -G _n and the horizontal sensing data lines SY ₁ -SY _N extend substantially in the row direction and 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 ) extend in approximately the column direction and are substantially parallel to each other. The reference voltage line RL extends in the row or column direction.

Each pixel PX includes a switching element Q connected to the display signal lines G ₁ -G _n , D ₁ -D _m , 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 such as a thin film transistor provided in the thin film transistor array panel 100, the control terminal of which is connected to the image scanning line G ₁ -G _n , and the input terminal of the thin film transistor display panel 100. D ₁ -D _m ), and 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. FIG. 2 shows that each pixel PX includes a color filter 230 representing one of the primary colors in an area of the common electrode display panel 200 corresponding to the pixel electrode 191 as an example of spatial division. . Unlike FIG. 2, the color filter 230 may be formed above or below the pixel electrode 191 of the thin film transistor array panel 100.

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. 4A or a structure shown in FIG. 4B.

The sensing unit SU1 shown in FIG. 4A includes a variable capacitor Cv, a sensing data line SL, and a reference voltage line connected to a horizontal or vertical sensing data line (hereinafter, referred to as a sensing data line) indicated by a reference numeral SL. And a reference capacitor Cp connected between the RLs.

The reference capacitor Cp is formed by overlapping the reference voltage line RL and the sensing data line SL of the thin film transistor array panel 100 with an insulator interposed therebetween.

The variable capacitor Cv has the sensing data line SL of the thin film transistor array panel 100 and the common electrode 270 of the common electrode display panel 200 as two terminals, and the liquid crystal layer 3 between the two terminals functions as a dielectric. do. The capacitance of the variable capacitor Cv is changed by an external stimulus such as a user's touch applied to the liquid crystal panel assembly 300. For example, pressure may be used as the external stimulus. When pressure is applied to the common electrode display panel 200, the distance between the two terminals is changed to change the capacitance of the variable capacitor Cv. When the capacitance changes, the magnitude of the contact voltage Vp between the reference capacitor Cp and the variable capacitor Cv changes, depending on the magnitude of the capacitance. The contact voltage Vp flows on the sensing data line SL as a sensing data signal, and based on the contact voltage Vp, the contact voltage Vp may be determined.

The sensing unit SU2 illustrated in FIG. 4B includes a switch SWT connected to the sensing data line 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. When the sensing unit SU2 is applied, the reference voltage line RL illustrated in FIG. 4A may be omitted.

The Y coordinate of the contact point can 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 is analyzed. The X coordinate of the contact point can be determined.

The sensing unit SU is disposed between two adjacent pixels PX. The density of the horizontal and vertical sensing data line _{(SY 1 -SY N, SX 1} -SX M) of a pair of sensing unit (SU) which is connected, respectively, disposed adjacent to the region in which they cross in, for example, It may be about one quarter of the dot density. Here, one dot includes, for example, three pixels PX arranged side by side and displaying three primary colors such as red, green, and blue, displaying one color, and a basic unit representing the resolution of the liquid crystal display device. do. However, one dot may consist of four or more pixels PX. In this case, each pixel PX may display one of three primary colors and white.

An example in which the density of the pair of sensing units SU is 1/4 of the dot density is one in which the horizontal and vertical resolutions of the pair of sensing units SU are 1/2 of the horizontal and vertical resolutions of the liquid crystal display device, respectively. Can be. In this case, there may be a pixel row and a pixel column without the sensing unit SU.

By matching the detection unit SU density and the dot density to such an extent, the liquid crystal display device may be applied to high precision applications such as character recognition. Of course, the resolution of the sensing unit SU may be higher or lower as necessary.

In the case of the liquid crystal display device to which the sensing unit SU1 illustrated in FIG. 4 is applied, the liquid crystal panel assembly 300 may include an initialization circuit (not shown) connected to each sensing unit SU1 and each of the sensing unit SU1. The apparatus may further include a plurality of amplifiers (not shown) respectively connected to the sensing data line as the output terminal.

At this time, the initialization circuit is composed of a switching element turned on by a reset signal (not shown) applied from the outside. When the switching element is applied by the reset signal, the initialization circuit detects an initialization voltage (not shown) applied from the outside. Applied to SL to initialize the state of the sense data line SL to minimize the effects of noise and the like.

In addition, the amplifier amplifies the sensing data signal output from the sensing unit SU1 through each sensing data line and applies it to the sensing signal processor 800.

Meanwhile, the liquid crystal display having the sensing unit may have a structure shown in FIG. 5 instead of the structure shown in FIG. 3.

Next, a structure of a liquid crystal display device incorporating another type of sensing unit PS will be described with reference to FIGS. 5 to 6B.

5 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention, and is a block diagram of another example of the liquid crystal display shown in terms of a sensing unit. 6A and 6B are equivalent circuit diagrams of a sensing unit of the liquid crystal display illustrated in FIG. 5.

In this case, the liquid crystal display includes the image scanning unit 400, the image data driver 500, the gray voltage generator 550, the signal controllers 600 and 610, and the touch determination unit 700 illustrated in FIGS. 1 and 3. In addition to the 710, the sensing scan unit 410 further includes. In addition, the sensing unit SU illustrated in FIG. 3 may be further provided. Reference numerals 610 and 710 denote the signal controller and the contact determination unit of the liquid crystal display shown in FIG. 5, respectively.

The liquid crystal panel assembly 300 includes a plurality of sensing signal lines S _α , P _β , Psg, and Psd (α and β are natural numbers) and a plurality of sensing units PS connected to and arranged in a substantially matrix form. can do.

The sensing signal lines S _α , P _β , Psg, and Psd may include a plurality of sensing scan lines S _α transmitting a sensing scan signal, a sensing data line P _β transferring a sensing data signal, and a plurality of sensing control voltages. Control voltage line Psg, and a plurality of input voltage lines Psd for transmitting a sensed input voltage.

The sensing scan line S _α and the control voltage line Psg extend substantially in the row direction and are substantially parallel to each other, and the sensing data line P _β and the input voltage line Psd extend substantially in the column direction and are substantially parallel to each other. .

When the detector PS is an optical sensor, the detector PS may have a structure shown in FIG. 6A or a structure shown in FIG. 6B.

The optical sensor PS1 illustrated in FIG. 6A includes a sensing element Qp1 connected to the signal lines Psg and Psd, and a switching element Qs connected to the sensing element Qp1 and the signal lines S _α and P _β .

The sensing element Qp1 is a three-terminal element such as a thin film transistor, the control terminal of which is connected to the control voltage line Psg, the input terminal of which is connected to the input voltage line Psd, and the output terminal of the switching element Qs. Connected with The sensing element Qp1 includes a photoelectric material that generates a photocurrent when light is irradiated. Examples of the sensing element Qp1 may include a thin film transistor having an amorphous silicon or polycrystalline silicon channel capable of generating a photocurrent. The sensing control voltage applied to the control terminal of the sensing element Qp1 is kept low or high enough so that the sensing element Qp1 can remain off in the absence of irradiated light. The sensing input voltage applied to the input terminal of the sensing element Qp1 maintains a sufficiently high value so that the photocurrent can flow in the direction of the switching element Qs.

The switching element Qs is also a three-terminal element such as a thin film transistor whose control terminal, output terminal and input terminal are connected to the sensing scan line S _α , the sensing data line P _β and the sensing element Qp1, respectively. The switching element Qs outputs a sensor output signal to the corresponding sensing data line P _β in response to the sensing scan signal from the sensing scan line S _α . The device output signal may be a photocurrent from sensing element Qp1.

The optical sensor PS2 shown in FIG. 6B includes only the sensing element Qp2 connected to the sensing signal lines S _α , P _β , and Psd.

The sensing element Qp2 is also a three-terminal element such as a thin film transistor, and its control terminal, output terminal, and input terminal are connected to the sensing scan line S _α , the sensing data line P _β , and the input voltage line Psd, respectively. The sensing element (Qp2) also when the light is irradiated includes a photoelectric material for generating a photoelectric current, detected by a light irradiation condition of the scan line (S _α) detected scan in response to the signal element the output signal is detected the data line from (P _β Export to). The sensing element Qp2 may output the element output signal when the sensing scan signal is greater than or equal to a predetermined voltage. In this case, the predetermined voltage may be determined in consideration of an operating area of the sensing element Qp2. When the photosensor PS2 is applied, the control voltage line Psg shown in FIG. 5A can be omitted.

The liquid crystal display including the sensing unit PS to which the photosensor PS1 or PS2 is applied may further include the sensing unit SU illustrated in FIG. 3. In this case, the sensing data line in one of the directions shown in FIG. 3 and the sensing unit SU connected thereto may be omitted, and the sensing data signal from the sensing unit SU may be used to determine whether there is a contact. The sense data signal from the light sensor PS1 or PS2 is used to determine the contact position.

1, 3, and 5, 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 and includes an image of a combination of a gate on voltage for turning on the switching element Q and a gate off voltage for turning off. The scan signal is applied to the image scan 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 voltages for all grays, the image data driver 500 divides the reference gray voltages so that the grays for all grays are divided. Generates a voltage and selects an image data signal among them.

In the case of the liquid crystal display shown in FIG. 3, the sensing signal processor 800 is connected to the sensing data lines SY ₁ -SY _N and SX ₁ -SX _M of the liquid crystal panel assembly 300 to detect the sensing data lines SY _1. -SY _N , SX ₁ -SX _M ) receives the sensed data signal output through the signal processing such as amplification and filtering, and then converts the analog-digital signal to generate a digital sense signal DSN.

In contrast, in the case of the liquid crystal display shown in FIG. 5, the sensing scan unit 700 is connected to the sensing scan line S _α of the liquid crystal panel assembly 300 so as to combine a gate on voltage and a gate off voltage or other signals. Is applied to the sensing scan line S _α . Alternatively, the sensing scan unit 700 may apply a sensing scan signal including a high voltage capable of generating a photocurrent and a low voltage incapable of generating the photocurrent to the sensing scan line S _α according to the operating region of the sensing element Qp2. .

At this time, the sensing signal processor 810 receives the sensing data lines (P _β) detected data signal (Vp) which is output is connected via a sensing data line (P _β) for the liquid crystal panel assembly 300 amplifies, filters, etc. After performing the signal processing of the analog-to-digital conversion to generate a digital sense signal (DSN). One sensing data signal Vp flowing in one sensing data line P _β at a specific time includes only the element output signal output from one sensing element Qp1 or Qp2 or two or more sensing elements Qp1 and Qp2. It may include a device output signal output from.

In the case of the liquid crystal display having the sensing unit PS to which the photosensor PS1 or PS2 is applied and the sensing unit SU shown in FIG. 3, the sensing signal processing unit 810 is connected to the sensing data line P _β . as well as the detected data signal (Vp) which is output sensing data line (SY ₁ -SY _N or SX ₁ -SX _M) amplifying the detected data signal output via a was subjected to signal processing such as filtering, analog-to-digital conversion Generate a digital sense signal.

The touch determining unit 700 or 710 receives the digital sensing signal DSN from the sensing signal processing units 800 and 810 to perform a predetermined calculation process to determine whether the contact is made and the contact position, and then sends the contact information INF to the external device. send. The touch determination units 700 and 710 may monitor the operating states of the sensing units SU and PS based on the digital sensing signals DSN and control signals applied thereto.

Also, the touch determination unit 710 may control the backlight (not shown) of the liquid crystal display by determining the intensity of the external light based on the related digital sensing signal DSN related to the sensing unit PS, which is an optical sensor. .

The signal controllers 600 and 610 control operations of the image scanning unit 400, the image data driver 500, the gray voltage generator 550, and the sensing signal processing units 800 and 810. In the case of the liquid crystal display shown in FIG. 5, the signal controller 610 controls the operation of the sensing scan unit 410.

Each of the driving devices 400, 500, 550, 600, 700 and 710, 800, and 810 or the sensing scan unit 410 may be directly mounted on the liquid crystal panel assembly 300 in the form of at least one integrated circuit chip, or may be flexible. Mounted on a flexible printed circuit film (not shown) and attached to the liquid crystal panel assembly 300 in the form of a tape carrier package (TCP), or a separate printed circuit board (not shown) May be mounted on the top of the head. Alternatively, these driving devices 400, 500, 550, 600, 700 and 710, 800 and 810 or the sensing scan unit 410 are connected to the signal lines G ₁ -G _n , D ₁ -D _m , SY ₁ -SY _N , SX ₁ -SX _M , S _α , P _β ) and the thin film transistor Q may be integrated in the liquid crystal panel assembly 300. In addition, the driving devices 400, 500, 550, 600, 700 and 710, 800 and 810 or the sensing scan unit 410 may be integrated into a single chip, in which case at least one of them or at least one circuit forming them The device may be outside a single chip.

Next, the display operation and the detection operation of the liquid crystal display will be described in more 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 device (not shown). The input video signals R, G, and B contain luminance information of each pixel PX, and the luminance is a predetermined number, for example, 1024 (= 2 ¹⁰ ), 256 (= 2 ⁸ ), or 64 (= 2 ⁶ ) It has gray. Examples of the input control signal include a vertical sync signal Vsync, a horizontal sync signal Hsync, a main clock MCLK, and a data enable signal DE.

The signal controllers 600 and 610 may output the input image signals R, G and B of the liquid crystal panel assembly 300 and the image data driver 500 based on the input image signals R, G and B and the input control signal. The image scanning control signal CONT1 is generated after the image processing control signal CONT1, the image data control signal CONT2, the sensing data control signal CONT3, and the like are properly processed according to the operating conditions. The image data control signal CONT2 and the processed image signal DAT are sent to the image data driver 500, and the detection data control signal CONT3 is sent to the detection signal processor 800.

In the case of the liquid crystal display illustrated in FIG. 5, the signal controller 610 generates the sensing data control signal CONT4 and the sensing scan control signal CONT5 in addition to the image scanning control signal CONT1 and the image data control signal CONT2. The sensing data control signal CONT4 is sent to the sensing signal processing unit 810, and the sensing scan control signal CONT5 is sent to the sensing scanning unit 410.

The image scan control signal CONT1 includes a scan start signal STV that indicates scanning start and at least one clock signal that controls the output of the gate-on voltage. The image scan control signal CONT1 may further include an output enable signal OE that defines the duration of the gate-on voltage.

The image data control signal CONT2 is a load signal for applying the image data signal to the horizontal synchronization start signal STH indicating the start of transmission of the image data DAT in one pixel row and the image data lines D ₁ -D _m . LOAD) and data clock signal HCLK. The image data control signal CONT2 is also an inversion signal for inverting the voltage polarity of the image data signal with respect to the common voltage Vcom (hereinafter referred to as the polarity of the image data signal by reducing the voltage polarity of the image data signal with respect to the common voltage). RVS) may be further included.

According to the image data control signal CONT2 from the signal controllers 600 and 610, the image data driver 500 receives the digital image signal DAT for the pixel PX of one pixel row, and each digital image signal. By selecting the gray scale voltage corresponding to the DAT, the digital image signal DAT is converted into an analog image data signal and then applied to the corresponding image data lines D ₁ -D _m .

The image scanning unit 400 applies a gate-on voltage to the image scanning lines G ₁ -G _n in response to the image scanning control signals CONT1 from the signal controllers 600 and 610, thereby applying the image scanning lines G ₁ -G _n. Turn on the switching element (Q) connected to. Then, the image data signal applied to the image data lines D ₁ -D _m is applied to the pixel PX through the turned-on switching element Q.

The difference between the voltage of the image 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.

This process is repeated 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), thereby repeating all image scanning lines G ₁ -G _n . Image data signals are applied to all the pixels PX by sequentially applying gate-on voltages to each other 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 image data driver 500 is controlled so that the polarity of the image data signal applied to each pixel PX is opposite to that of the previous frame. ("Frame inversion"). In this case, the polarity of the image data signal flowing through one image data line is changed (eg, inversion of a row, inversion of a point) according to the characteristics of the inversion signal RVS within one frame, or the polarity of the image data signal applied to one pixel row. May differ from one another (eg, nirvana, point inversion).

The sensing signal processing unit 800 flows along the sensing data lines SY ₁ -SY _N and SX ₁ -SX _M in a porch section between the frames once every frame according to the sensing data control signal CONT3. Read the sense data signal. In the porch section, since the sensing data signal is less affected by the driving signals from the image scanning unit 400, the image data driver 500, and the like, the reliability of the sensing data signal is increased. However, such a read operation is not necessarily performed every frame, and may be performed once every plurality of frames as necessary.

The sensing signal processor 800 converts the read analog sensing data signal into a digital sensing signal DSN after signal processing such as amplification and filtering, and sends it to the touch determination unit 700.

The touch determination unit 700 receives a digital sensing signal DSN, performs appropriate arithmetic processing to find out whether a contact is made and a contact position, and transmits the same to an external device, and the external device transmits the image signals R, G, and B based thereon. Transfer to the liquid crystal display device.

Meanwhile, as the optical sensors (PS1, PS2), a liquid crystal display device, one case, the signal control gate detects the turn-on voltage scan line (S _α) according to the detected scan control signal (CONT5) from 610 is applied as shown in Figure 5 Is applied to turn on the switching element Qs connected to the sensing scan line S _α . Accordingly, the sensing data signal from the sensing element Qp1 is applied to the corresponding sensing data line P _β through the turned-on switching element Qs. Alternatively, the sensing scan unit 410 may apply a high voltage to the sensing scan line S _α , whereby the sensing element Qp2 connected to the sensing scan line S _α senses a photocurrent as a sensing data signal. Can be exported as (P _β ).

In this case, the sensing signal processor 810 reads a sensing data signal flowing along the sensing data line P _β according to the sensing data control signal CONT4. The sensing signal processor 810 converts the read analog sensing data signal into a digital sensing signal DSN after signal processing such as amplification and filtering, and sends it to the touch determination unit 710.

The touch determination unit 710 receives the digital sensing signal DSN, performs appropriate arithmetic processing to find out whether or not the contact is made, and transmits the contact position to an external device, and the external device transmits the image signals R, G, and B based thereon. Transfer to the liquid crystal display device.

By repeating this process in units of one or more horizontal periods according to the vertical resolution of the sensing unit PS, which is an optical sensor, all the sensing units PS are applied by sequentially applying gate-on voltage / high voltage to all sensing scan lines S _α . Process the sensed data signal from the digital signal to generate a digital sensed signal (DSN).

This sensing operation is performed separately from the above-described display operation and is not influenced by each other. The sensing operation does not necessarily need to be performed every frame, and may be performed once for each of a plurality of frames as necessary.

As described above, the VI test method for inspecting the state of the built-in detectors SU and PS in the liquid crystal display including the detectors SU and PS will be described.

First, the operation of the sensing unit SU1 illustrated in FIG. 4A is examined with reference to FIG. 7.

FIG. 7 is an equivalent circuit diagram of a liquid crystal panel assembly for VI inspection of the sensing unit shown in FIG. 4A, according to an embodiment of the present invention.

As shown in FIG. 7, the liquid crystal display device also includes the driving devices 400, 500, 550, 600, 700, and 800 described with reference to FIGS. 1 and 3, and the liquid crystal panel assembly 300 It further includes the initialization circuit 900 and the plurality of amplifiers 910 described above. In addition, on the liquid crystal panel assembly 300, a plurality of first scan pads 310, a plurality of data lines 320, and a plurality of sensing data lines 330 are respectively connected to first and second test pads IP1 and IP2. And second inspection lines IL1 and IL2.

The first inspection line IL1 is connected to the odd-numbered data line 320 through the contact portion C1, and the second inspection line IL2 is connected to the even-numbered data line 320 through the contact portion C2. have.

The inspection lines IL1 and IL2 each include an extension line 321 extending from the contact portions C1 and C2.

Each data line 320 and the sensing data line 330 are connected to the extension line 321 through connection lines 322 and 331 formed between the contact portions C3 and C4, respectively.

  In addition, the sensing data line 330 is connected to the immediately adjacent odd-numbered or even-numbered data line 320. Although not shown in FIG. 7, the data line 320 is connected to the image data driver 500 through the contact part C4, and the sensing data line 320 is connected to the sensing signal processor 800 through the contact part C4. Connected. The first and second sensing lines IL1 and IL2 are arranged near the outside of the display area where a plurality of pixel areas defined by the intersection of the image scanning lines G1 -Gn and the data lines D1 -Dm gather to display an image. The light blocking member may be formed in a peripheral area of the light blocking member to block light leaking out of the display area.

The initialization circuit 900 is connected to an input side of each sensing data line 330, receives a reset signal RST as a sensing control terminal, and applies a switching element Q10 to which a driving voltage Vdir is applied as an input terminal. And the initialization circuit 900 is formed on the liquid crystal panel assembly, but is not limited thereto.

The amplifier 910 is connected to the output side of each sense data line 330 and includes an amplifier circuit and the like. The amplifier 910 is also formed on the liquid crystal panel assembly, but is not limited thereto.

In FIG. 7, the image scanning unit 400 is also formed on the liquid crystal panel assembly, but is not limited thereto.

The pixel PX shown in FIG. 7 illustrates only the liquid crystal capacitor Clc, and the sensing unit SU1 is formed for each of the predetermined number of dots in the row direction and the column direction. Therefore, the sensing data line 330 is connected to the odd-numbered or even-numbered data line 320 connected to the immediately adjacent pixel among adjacent dots.

The following VI test is described.

First, the VI inspection operation of the pixel will be described.

A separate inspection device (not shown) applies an image data voltage to the first inspection line IL1 by using the first inspection pad IP1, and the odd-numbered data line 320 connected to the first inspection line IL1. To the test signal.

In this state, the image scanning unit 400 sequentially applies an image scanning signal (not shown) having the gate-on voltage Von to the image scanning line 310, thereby switching the switching element Q of the corresponding pixel row. Turn on.

As a result, the voltage of the test signal applied through the data line 320 connected to the first test line IL1 is stored in the liquid crystal capacitor Clc through the turned-on switching element Q, so that the voltage of the test signal is reduced. Indicates the corresponding brightness.

Then, the inspector visually checks a display state such as brightness of a screen to check whether a corresponding data line is disconnected or an operation state of a pixel.

Then, the application of the test signal applied to the first test pad IP1 is stopped.

The test signal is applied to the second test line IL2 using the second test pad IP2, and the test signal is transmitted to the even-numbered data line 320 connected to the second test line IL2.

In this state, the image scanning unit 400 sequentially applies an image scanning signal having a gate-on voltage Von to the image scanning line 310 to turn on the switching element Q of the pixel row, thereby In turn.

Then, the inspector visually checks a display state such as brightness of a screen to check whether a corresponding data line is disconnected or an operation state of a pixel.

The application of the test signal into the even-numbered data lines 320 and the odd-numbered data lines 320 by using the first and second test pads IP1 and IP2 divides the pixels into odd-numbered pixel columns and even-numbered pixel columns. This is to make the VI test easier. Therefore, unlike the description above, the pixel states of the even-numbered pixel columns may be examined in turn, and then the pixel states of the odd-numbered pixel columns may be examined, or the pixels may be sequentially examined after applying a test signal to all the pixel columns without the odd-numbered even-numbered division. It may be. When the test signal is applied to all pixels without the odd-numbered even-numbered division, only one test line having the test pad and connected to all the data lines 320 may be formed.

As such, when the VI test of the pixel is completed using the test pad IP2 and the test line IL2, the supply of the test signal applied to the test pad IP2 is stopped.

Next, since the VI inspection of the pixel is completed, the inspection lines IL1 and IL2 and the extension lines 321 connected thereto are cut along the cutting line TL1 using a laser trimming device or the like, and the inspection line ( The connection between the IL1 and IL2) and the data line 320 is released.

As such, when the VI test for the pixel is completed, the VI test of the detection unit SU1 is performed.

First, the reset voltage RST is applied to the control terminals of all the switching elements Q10 of the initialization circuit 900 through a separate inspection device (not shown), and the driving voltage Vdir having a predetermined magnitude value at the input terminal. ) Is applied. The application of the reset voltage RST and the driving voltage Vdir for the inspection of the sensing unit SU1 is performed by input pads formed on the control terminal and the input terminal, respectively, without forming a separate test line or a test pad. Is made).

Next, an image scanning signal (not shown) having a gate-on voltage Von is applied to the image scanning line 310 in order from the top to the bottom through the image scanning unit 400 to switch the corresponding pixels PX. The element Q is driven.

At this time, a voltage having a predetermined magnitude such as a common voltage and a reference voltage is already applied to one terminal of the capacitors Cv and Cp of the sensing unit SU1. Accordingly, a switching device in which a sensing signal corresponding to the capacitances of the capacitors Cv and Cp is applied to the corresponding data line 320 through the amplifier 910 and the contact portions C4 and C3 through the connection lines 331 and 322 and turned on. It is stored in the liquid crystal capacitor Clc via (Q). That is, the pixel PX operates.

Then, the inspector visually checks a display state such as brightness of a screen and checks whether the corresponding sensing data line 330 is disconnected or an operation state of the corresponding sensing unit.

As such, when the sensing data line 330 is in contact with the adjacent data line 320 and the VI of the sensing unit SU1 is finished, the reset signal RST and the driving voltage Vdir applied to the initialization circuit 900 are applied. Suspend authorization. Thereafter, the laser cutting apparatus is cut along the cutting line TL2, and the connection between the sensing data line 330 and the data line 320 is released.

Unlike the above description, the state of the pixel may also be inspected through the VI inspection of the sensing unit SU1. That is, when all the pixel states arranged in the same column are abnormal, it is determined that the state of the adjacent sensing column or the corresponding sensing data line 330 is abnormal. However, when the state of some of the pixels arranged in the same column is in a bad state, the state of the adjacent sensing unit column is normal while the state of the corresponding sensing data line 30 is normal. In this case, only one cutting operation performed along the cutting line TL2 may be performed.

Next, the operation of the sensing unit PS1 illustrated in FIG. 6A is examined with reference to FIG. 8.

FIG. 8 is an equivalent circuit diagram of a liquid crystal panel assembly for VI inspection of the sensing unit shown in FIG. 6A according to another embodiment of the present invention.

 When FIG. 8 is compared with FIG. 7, parts having the same structure and performing the same function are denoted by the same reference numerals as shown in FIG. 7, and detailed description thereof will be omitted.

 In comparison with FIG. 7, FIG. 8 shows that the switching circuit 900 and the amplifier 910 are not present, but instead are sensed extending in the horizontal direction from the sensing scan unit 410 and the sensing scan unit 410 in the same row. A plurality of sensing scan lines 340 connected to the unit PS1 are provided. Also, the sensing scan unit 410 and the plurality of sensing scan lines 340 are formed on the liquid crystal panel assembly.

Next, the VI inspection operation of the pixel will be described.

The VI inspection operation of the pixel illustrated in FIG. 8 is similar to the VI inspection operation of the pixel described with reference to FIG. 7.

That is, a separate inspection device (not shown) applies an image data voltage to the first inspection line IL1 by using the first inspection pad IP1 to connect the odd-numbered data line connected to the first inspection line IL1. The test signal is transmitted to the 320.

In this state, an image scanning signal (not shown) having a gate-on voltage Von is sequentially applied to the image scanning line 310 through the image scanning unit 400 to switch the switching elements Q of the pixel row. By turning on, the pixel is operated by an inspection signal applied through the data line 320 connected to the first inspection line IL1.

Thereafter, the inspector visually checks a display state such as brightness of the screen to check whether the corresponding data line is disconnected or the operation state of the pixel, and then stops applying the test signal applied to the first test pad IP1.

Next, the test signal is applied to the second test line IL2 through the second test pad IP2, and the test signal is transmitted to the even-numbered data line 320 connected to the second test line IL2.

In this state, the image scanning unit 400 sequentially applies the image scanning signal having the gate-on voltage Von to the corresponding image scanning line 310 to turn on the switching element Q of the corresponding pixel row. The pixels are operated in sequence.

Then, the inspector visually checks a display state such as brightness of a screen to check whether a corresponding data line is disconnected or an operation state of a pixel.

As such, when the VI test of the pixel is completed using the test pad IP2 and the test line IL2, the supply of the test signal applied to the test pad IP2 is stopped.

Of course, the state of the pixel connected to the even-numbered data line may be inspected first, and then the state of the pixel connected to the odd-numbered data line may be inspected, or the state of the pixel may be inspected by simultaneously applying image data voltages to all the data lines. have.

As described above, when the VI inspection for the pixel is completed, the laser line is cut along the cutting line TL1 using a laser-trapping device or the like to disconnect the inspection lines IL1 and IL2 from the data line 320.

Next, a VI test of the operation of the detection unit SU1 is performed.

The image scanning signal 400 having the gate-on voltage Von and the sensing scanning signal are sequentially applied through the image scanning unit 400 and the sensing scanning unit 410 from the image scanning line and the sensing scanning line located at the top, and then the pixels of the corresponding column are provided. And the sensing unit SU1 are operated. At this time, light (external light, etc.) having a predetermined intensity is irradiated to the sensing unit SU1 to inspect the sensing unit SU1.

Therefore, the current flowing through the sensing element Qp1 corresponding to the intensity of the irradiated light is turned on via the switching elements Qs and the sensing scan line 330 and the contacts C4 and C3 and the connection lines 331 and 322. As it is applied to the line 320 and flows through the liquid crystal capacitor Clc through the turned-on switching element Q of the corresponding row, a charge of the corresponding size is charged in the liquid crystal capacitor Clc. Therefore, the operation state of the pixel PX is determined according to the state of charge of the liquid crystal capacitor Clc.

Then, the inspector visually checks a display state such as brightness of the screen and examines whether the corresponding sensing data line 330 is disconnected or an operation state of the corresponding sensing unit.

When the VI inspection of all the sensing units PS1 is completed in this manner, the laser cutting apparatus is used to cut along the cutting line TL2 to disconnect the connection between the sensing data line 330 and the data line 320. Release it.

As described with reference to FIG. 7, the state of the pixel may also be inspected through the VI inspection of the sensing unit SU1. That is, when the resolution of the pixel is larger than the resolution of the sensing unit, the failure of one sensing unit PS1 is related to the defect of the same pixel string connected to all of the data lines 320 connected to the sensing unit PS1. Therefore, if all the pixels in the same column are in a bad state, the corresponding detection unit or detection scan line is defective. If only a few of the pixels in the same column are defective, the corresponding detection unit or the detection scan line is in a normal state, but the pixel in which the defect has occurred It is determined to be abnormal. In this case, only one cutting operation performed along the cutting line TL2 may be performed.

In the VI inspection operation described with reference to FIGS. 7 and 8, in order to facilitate the VI inspection, the color of the pixel is mainly black or white, but of course, the color of the pixel may be changed.

Next, a structure mounted on the liquid crystal panel assembly of the first and second test lines IL1 and IL2 and the test pads IP1 and IP2 will be described with reference to FIGS. 9 and 10.

9 is a partial layout view of a portion of the lower panel on which an inspection line and an inspection pad are formed according to an exemplary embodiment of the present invention, and FIG. 10 is a cross-sectional view of the lower panel of FIG. 9 taken along the line X-X.

Inspection lines 122 and 123 are formed on an insulating substrate 110 made of transparent glass or plastic.

The inspection lines 122 and 123 transmit inspection signals, respectively, and extend in parallel to each other mainly in the horizontal direction. Each inspection line 122, 123 includes inspection pads 126, 128 having a large area for connection with another layer or an external driving circuit.

The inspection lines 122 and 123 are aluminum-based metals such as aluminum (Al) and aluminum alloys, silver-based metals such as silver (Ag) and silver alloys, copper-based metals such as copper (Cu) and copper alloys, molybdenum (Mo) and molybdenum The alloy may be made of molybdenum-based metals such as 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 inspection lines 122 and 123 may be made of various other metals or conductors.

A gate insulating layer 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the inspection lines 122 and 123.

A plurality of extension lines 172 are formed on the gate insulating layer 140. Each extension line 172 is formed with a contact portion C3 having a large area in the horizontal direction. The contact portion C3 includes a plurality of connection lines DL connected to the corresponding data line through the contact portion C4 and a signal line formed of connection lines SL1 and SL2 connected to the corresponding sensing data line through the contact portion C4, respectively. Group LG is connected. As shown in FIG. 9, since the total number of data lines DL connected to the extension line 127 through each contact portion C3 is 12, when one dot is composed of three pixels, each extension line ( Four dots are connected to 127, and two sensing units are arranged for each of these four dots. These sensing units may be different kinds of sensing units, for example, the sensing unit SU2 shown in FIG. 4B and the sensing unit PS1 shown in FIG. 6A, but the type and number of sensing units may be changed as necessary. In addition, the number of pixels constituting one dot can also be changed.

The extension line 172 is preferably made of a refractory metal such as molybdenum, chromium, tantalum and titanium or an alloy thereof, and includes a refractory metal film (not shown) and a low resistance conductive film (not shown). It may have a multilayer structure. 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 connection line 172 may be made of various other metals or conductors.

It is also preferable that the connecting line is inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

A passivation layer 180 is formed on the extension line 172 and the exposed gate insulating layer 140. 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 a lower inorganic layer and an upper organic layer.

The passivation layer 180 and the gate insulating layer 140 have a plurality of contact holes 183 exposing a part of the test line 122, a plurality of contact holes 184 exposing a part of the test line 123, and a test line 122. And pad contact holes 186 and 188 respectively exposing the test pads 126 and 128 of the 123, respectively.

A plurality of connection members 86, 87, 88, and 89 are formed on the passivation layer 180. They may be made of a transparent conductive material such as ITO or IZO or a reflective metal such as aluminum, silver, chromium or an alloy thereof.

The connecting members 86, 87, 88, and 89 are part of the inspection line 122, the end of the inspection line 123, and the inspection pad 126 through the contact holes 183 and 184 and the pad contact hole 186, respectively. , 128). The connecting members 86, 87, 88, and 89 compensate for and protect the adhesion between the test lines 122 and 123 and the test pads 126 and 128 and the external device.

In the above-described embodiment, the VI inspection for inspecting the operation of the sensing unit shown in FIGS. 4A and 6A has been described, but the present invention is also applicable to the sensing unit having other configurations.

In addition, the present embodiment has been described with reference to a liquid crystal display device as a display device having a sensing unit, but is not limited thereto. A flat panel display device such as a plasma display device and an organic light emitting display device may be used. The same can be applied to.

According to the present invention, an inspection signal is applied and a separate inspection line connected to the data line and the corresponding sensing data line is formed on the liquid crystal panel assembly, thereby performing VI inspection of the operation of the sensing unit and the pixel without forming an image data driver. have. Therefore, due to the application of the inspection signal through the inspection line, the inspection unit and the operation of the pixel can be inspected VI without attaching the image data driver for applying the data line to the liquid crystal panel assembly. This reduces the consumption of unnecessary image data driver and the like. Therefore, the manufacturing cost of the liquid crystal display device is reduced, and the defective rate is also reduced.

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 (10)

A plurality of first display signal lines, A plurality of second display signal lines crossing the first display signal line; A plurality of sensing lines parallel to the second display signal line, A plurality of switching elements connected to one of the first display line and one of the second display signal line, respectively; A pixel electrode connected to the switching element, A plurality of sensing units respectively connected to one of the plurality of sensing lines, and At least one inspection line spaced apart from the first and second display signal lines, the sensing line, the pixel, and the sensing unit, and configured to transmit an inspection signal to the second display signal line It includes a liquid crystal panel having a, The test line includes a test pad receiving a test signal from the outside, Each sensing line is connected to an adjacent second display signal line Liquid crystal display. In claim 1, The inspection line includes first and second inspection lines, And the first inspection line is connected to an odd-numbered display signal line of the second display signal line. In claim 1, The liquid crystal display further comprises an image scanning unit connected to the first display signal line. In claim 3, The sensing unit includes a variable capacitor and a reference capacitor connected to the sensing line. In claim 4, The liquid crystal display further comprises an initialization circuit and an amplifier connected to the sensing line, respectively. In claim 3, The sensing unit is a liquid crystal display device. In claim 1, And the inspection line is formed of the same layer as the first display signal line. In claim 7, The inspection line includes a plurality of extensions, And a second signal display line is connected to a sensing line through each of the extension parts. In claim 8, And each of the extension portions is made of the same layer as the second display signal line or the sensing line. In claim 7, Further comprising a connection member made of the same layer as the pixel electrode, And each of the extension parts is connected to the inspection line through the connection member.

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