KR101350886B1 - Field sequential color driving method of LCD device with built-in image sensor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a time division driving method of a liquid crystal display device having an image sensor thin film transistor.

According to the present invention, by dividing one frame into 1/3 frames and time-division driving sequentially, a higher contrast can be obtained at the time of display driving, and the R, G, and B colors of the scan target are sequentially scanned at the time of driving driving. Among the pixels corresponding to the R, G, and B colors, one pixel is first scanned and input to the storage means, and noise-data generated in the other two pixels is discharged. Therefore, it is possible to prevent distortion of the scan image by the noise-data, thereby implementing a more stable scan operation.

Image sensor, field sequential color

Description

Field-sequential color driving method of LCD device with built-in image sensor

1 is a view schematically illustrating a structure of a general liquid crystal display device.

2 is a view for explaining the structure of a liquid crystal panel of a conventional liquid crystal display device with a built-in image sensor.

3 is a view for explaining time-division driving timing of the image sensor-embedded liquid crystal display device of the present invention.

4 is an equivalent circuit diagram of one pixel of a liquid crystal panel of the liquid crystal display device with an image sensor according to an exemplary embodiment of the present invention.

5 is a view for explaining a time division driving method of an image sensor-embedded liquid crystal display according to an exemplary embodiment of the present invention.

6 is a flowchart illustrating a time division driving method of an image sensor-embedded liquid crystal display according to an exemplary embodiment of the present invention.

Description of the Related Art

P: unit pixel 100: liquid crystal panel

180: backlight device 190: control unit

200: scan object

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a time division driving method of a liquid crystal display device having an image sensor thin film transistor.

The image realization principle of the general liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. The liquid crystal has a thin and long molecular structure, optical anisotropy with different refractive indices depending on the array direction, and its size when placed in an electric field. As a result, the orientation of the molecular sequence changes. Therefore, the liquid crystal display device is an essential component of a liquid crystal panel composed of a pair of transparent substrates, each having a liquid crystal layer interposed therebetween by a predetermined distance, and having an electric field generating electrode formed therebetween. Through this, the alignment direction of the liquid crystal molecules is artificially adjusted and the light transmittance is changed accordingly to display various images.

1 is a view schematically illustrating a structure of a general liquid crystal display device.

As shown, the liquid crystal display device is formed by bonding an array substrate on which a thin film transistor and a pixel electrode are formed, and a color filter substrate on which a color filter and a common electrode are formed to be separated by a predetermined distance, and injecting a liquid crystal material between the two substrates. And a control unit 9 including a plurality of driving circuits for electrically driving the liquid crystal panel 1.

In addition, the liquid crystal panel is generally composed of a light-receiving element that does not have its own light emitting element, so a separate light source should be provided. For this purpose, a backlight device 8 is provided on the back of the liquid crystal panel.

Here, a fluorescent lamp such as a Cold Cathode Fluorescent Lamp (CCFL) and an External Electrode Fluorescent Lamp (EEFL) is widely used in the backlight device, but recently, the LED (Light Emitting Diode), which is advantageous for miniaturization, light weight, thin film, and low power consumption, is backlighted. The method of use for an apparatus is proposed.

On the other hand, the recent electronic products have a trend to have the effect of using multiple products at the same time as a single product by having a variety of complex functions, according to this trend, not only functions as a display device in the liquid crystal display device but also an image scanner ( A liquid crystal display device for use as an image scanner has been proposed.

This is a liquid crystal display device with an image sensor that utilizes a thin film transistor as an image sensor as well as a switching element. In addition to a display function, a document, image or location information input function is added to integrate a display function and an image input function. Therefore, compared to the prior art, in which the input device and the display device must be provided separately, there is a more efficient advantage in terms of space utilization and manufacturing cost.

Such an image sensor-embedded liquid crystal display device is a device which detects an amount of charge according to light intensity as information through a thin film transistor image sensor of a liquid crystal panel, and transfers this information according to an external control signal. It is used in the image reader of the same image processing device.

Hereinafter, a conventional liquid crystal display device with an image sensor will be described with reference to the accompanying drawings.

In the following description, for the sake of more intuitive example, the structure of one unit pixel will be described. However, in a practical implementation, one liquid crystal panel includes a plurality of unit pixels of the illustrated structure.

2 is a view for explaining a liquid crystal panel structure of a conventional liquid crystal display device with a built-in image sensor.

As illustrated, the unit pixel P of the liquid crystal panel with an image sensor embedded therein is defined at a point where the first gate line GLa and the first data line DLa cross each other to perform display driving. DP and two sub-pixels, which are sensor pixels SP that are defined at intersections of the second gate line GLb and the second data line DLb to perform scan driving.

Here, the display pixel DP is a pixel for displaying an image, and is similar in shape to one pixel of the general liquid crystal display device described above, and is synchronized with the display driving signal sequentially input from the first gate line Gla. Turn-on / off the switching element (not shown) included in the DP), and change the molecular arrangement of the liquid crystal through a data signal input from the first data line DLa to display an image. do.

In addition, the sensor pixel SP is a pixel for converting an external scan object into data, and senses the amount of light reflected from the target object to be scanned through the built-in image sensor and sequentially inputs it from the second gate line GLb. In turn, the switching element (not shown) provided in the sensor pixel SP is turned on / off in synchronization with the scan driving signal, and the detected result is transmitted through the second data line DLb. Supply to a control unit (not shown).

In the above-described liquid crystal display device with an image sensor, the display pixel DP and the sensor pixel SP are connected to separate first and second gate lines GLa and GLb in order to implement display driving and scanning driving separately. Form.

However, this type of liquid crystal display having a built-in image sensor is scattered in a predetermined amount when the light irradiated to the scan object through the display pixel DP is reflected again and is incident on the sensor pixel SP. Light is detected by the sensor pixels corresponding to other neighboring colors.

This is a major cause of poor quality scan results.

The present invention has been made to solve the above problems, by applying a time-division driving method to a liquid crystal display device with a built-in image sensor thin film transistor, to ensure a higher luminance when driving the display, neighboring sensors during the scan driving It is an object of the present invention to provide a time-division driving method of an image sensor-embedded liquid crystal display device that solves a problem that a scanned image signal is distorted due to light corresponding to other sensor pixels flowing into a pixel.

In order to achieve the above object, a preferred time-division driving method of a liquid crystal display device with an embedded image sensor according to the present invention includes a first pixel comprising a display pixel connected to a first gate line and a sensor pixel connected to a second gate line. A backlight device including a liquid crystal panel including a third unit pixel, first and third light sources for supplying light of different first to third colors to the liquid crystal panel to implement white light, and the liquid crystal panel And a control unit for controlling the backlight device, the method comprising: disposing a scan object on an upper portion of the liquid crystal panel; And scanning the shape of the scan object in response to light of the first to third colors sequentially passing through each of the first to third unit pixels.

The scanning of the scan object may include transmitting the light of the first color through the display pixel of the first unit pixel; Reflecting the transmitted light of the first color from the scan object; Sensing light of the reflected first color in the sensor pixels of the first to third unit pixels; The light of the detected first color is stored as scan data through the sensor pixels of the first unit pixel, and the noise-data is stored as light of the detected first color through the sensor pixels of the second and third unit pixels. and discharging as (noise-data).

The transmitting of the light of the first color through the display pixel of the first unit pixel may include: supplying a high signal to the first gate line; Supplying a data signal of maximum gradation to a display pixel of the first unit pixel; And supplying a data signal having a minimum gray scale to the display pixels of the second and third unit pixels.

The light of the detected first color is stored as scan data in the sensor pixel of the first unit pixel, and the noise-data is stored in the light of the detected first color in the sensor pixels of the second and third unit pixels. discharging as (data), the method comprising: supplying a high signal to the second gate line; Storing the scan data sensed by the sensor pixel of the first unit pixel in the controller; And discharging the noise data detected by the sensor pixels of the second and third unit pixels in the controller.

The scanning of the shape of the scan object may include transmitting light of the second color through the display pixel of the second unit pixel; Reflecting the transmitted second color light from the scan object; Sensing light of the reflected second color in the sensor pixels of the first to third unit pixels; The light of the detected second color is stored as scan data in the sensor pixel of the second unit pixel, and the noise of the detected second color light in the sensor pixels of the first and third unit pixels is noise-data. -data) further comprising the step of discharging.

The scanning of the shape of the scan object may include transmitting the light of the third color through the display pixel of the third unit pixel; Reflecting the transmitted third color light from the scan object; Sensing light of the reflected third color in the sensor pixels of the first to third unit pixels; The light of the detected third color is stored as scan data through the sensor pixel of the third unit pixel, and the noise of the detected third color light through the sensor pixels of the first and second unit pixels. and discharging as (noise-data).

When a period of scanning the entire shape of the scan object is called one frame, the first to third colors of light are scanned for 1/3 frame period, respectively.

Each of the display pixels includes a liquid crystal capacitor and a first storage capacitor having a grounded first electrode, a gate electrode connected to the first gate line, a source electrode connected to a first data line, and a drain electrode connected to the liquid crystal. And a first switching transistor connected to the capacitor and the second electrode of the first storage capacitor.

Each of the sensor pixels may include a second storage capacitor having a first electrode grounded, a gate electrode connected with the second gate line, a drain electrode connected with a second data line, and a source electrode connected with the second storage capacitor. A second switching transistor connected to the second transistor; The gate electrode may be grounded, the source electrode may be connected to the driving power supply terminal, and the drain electrode may include a phototransistor connected to the source electrode of the second switching transistor.

The light of the first to the third color is characterized in that corresponding to the R color, G color, B color, respectively.

The first to third light sources are characterized in that the LED lamp for emitting light of R color, G color, B color, respectively.

The present invention has a similar structure to the above-described conventional liquid crystal display device with an image sensor, except that the color filter is not provided in the liquid crystal panel. In addition, the lamp used in the backlight device is preferably applied to the LED emitting light of the three primary colors of R, G, B. This is to drive the liquid crystal display in a field sequential color mode by turning on the LEDs of the three primary colors of R, G, and B in different periods.

The color filter has a transmittance of approximately 33% relative to the amount of light irradiated from the backlight device. When the color filter is omitted from the liquid crystal panel, a higher luminance can be obtained.

Hereinafter, a time division driving method of an image sensor-embedded liquid crystal display device according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a view for explaining time-division driving timing of the image sensor-embedded liquid crystal display device of the present invention.

As shown, data signals for the three primary colors of R, G, and B of the liquid crystal panel are sequentially generated one at a time at the same ratio (R: G: B = 1: 1: 1) within one vertical synchronization period. The light source of the backlight device is also synchronized in the same manner so that the red (R) light source, the green (G) light source, and the blue (B) light source are sequentially turned on. In this case, each light source is an LED, and each of the red, green, and blue LEDs is sequentially arranged.

In addition, the entire frame (1 frame = 16.7 ms) on the panel is separated into three subframes (1 Sub-frame = 5.56 ms) of red (R), green (G), and blue (B).

Here, each subframe is divided into data writing time (AP = 1.69 ms), liquid crystal response time (WP = 1.5 ms), and LED emission time (FP = 2.37 ms) through a thin film transistor scan. The time FP at which the LED lamp can be turned on is the time excluding the data writing time AP and the liquid crystal response time WP. Therefore, the time division driving type backlight device requires a liquid crystal panel having a faster liquid crystal response speed than that constituted by one frame, and the liquid crystal panel is driven in each subframe unit.

4 is an equivalent circuit diagram of one pixel of a liquid crystal panel of the liquid crystal display device with an image sensor according to an exemplary embodiment of the present invention.

As illustrated, the unit pixel P of the liquid crystal panel of the liquid crystal display device with an image sensor according to the present invention is defined at a point where the first gate line GLa and the first data line DLa cross each other, and display driving is performed. A sensor pixel SP that is defined at the intersection of the display pixel DP, the second gate line GLb, the driving voltage line V _DD , and the second data line DLb to perform scan driving. It consists of two subpixels.

More specifically, the display pixel DP is a pixel for displaying an image and includes a first switching transistor T1, a liquid crystal capacitor C _LC , and a first storage capacitor Cst1.

In the first switching transistor T1, a gate electrode is connected to the first gate line GLa and a source electrode is connected to the first data line DLa. In addition, the liquid crystal capacitor C _LC and the first storage capacitor Cst1 have a structure in which one electrode is connected to the drain electrode of the first switching transistor T1 and the other electrode is grounded.

The sensor pixel SP is a pixel for converting an external scan object into a data, and is composed of a photo transistor TP, a second switching transistor T2, and a second storage capacitor Cst2.

The phototransistor TP is an image sensor. The gate electrode is grounded, the source electrode is connected to the driving voltage line V _DD , and the drain electrode is connected to the source electrode of the second switching transistor T2.

In the second switching transistor T2, a gate electrode is connected to the second gate line GLb, a source electrode is connected to the drain electrode of the phototransistor TP, and the drain electrode is connected to the second data line DLb. Connected.

In addition, the second storage capacitor Cst2 has a structure in which one electrode is grounded, and the other electrode is connected to the drain electrode of the phototransistor TP and the source electrode of the second switching transistor T2.

In the liquid crystal panel of the liquid crystal display device with an image sensor, the display pixel DP and the sensor pixel SP may have separate first and second gate lines GLa and GLb in order to implement display and scan driving separately. The display pixel DP and the sensor pixel SP may be connected to one gate line to simultaneously display and scan driving.

Hereinafter, a time division driving method of an image sensor-embedded liquid crystal display device according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

First, during display driving, a high level display driving signal is sequentially applied from the first gate line Gla to turn the first switching transistor T1 on. The data signal is input to one data line DLb. Accordingly, the voltage corresponding to the data signal is charged in the liquid crystal capacitor C _LC and the first storage capacitor Cst1 to control the refractive index of the liquid crystal layer interposed in the liquid crystal capacitor C _LC in a state capable of gray scale expression.

Although not shown, light incident from a backlight device (not shown) provided on the rear surface passes through the liquid crystal layer to implement an image.

Thereafter, when the display driving signal having a low level is applied from the first gate line GLa, the first switching transistor T1 is turned off and the first storage capacitor Cst1 is turned on. The voltage stored in the liquid crystal capacitor C _LC is maintained through the charge stored in the liquid crystal capacitor C _LC .

In addition, during scan driving, the light passing through the display pixel DP is reflected to the scan object and is incident again to the sensor pixel SP of the liquid crystal panel, and the phototransistor TP is provided in the sensor pixel SP. A current corresponding to the size of the incident light flows through the charge, and the charge corresponding thereto is stored in the second storage capacitor Cst2 to generate scan data corresponding to the shape of the scan object.

Thereafter, when a scan driving signal having a high level is applied through the second gate line GLb to read the scan data, the second switching transistor T2 is turned on. The scanned data stored in the second storage capacitor Cst2 in synchronization is input to the controller (not shown) through the second data line DLb.

Here, the scanned data may be stored in a memory provided separately in some cases.

Through this operation, one pixel of the image sensor-embedded liquid crystal display device performs the display operation and the scan operation.

Hereinafter, referring to FIG. 5, a time division driving method of an image sensor-embedded liquid crystal display device according to an exemplary embodiment of the present invention, which solves a conventional problem, will be described with reference to FIG. 5. In the following description, unless otherwise specified, the reference numerals of the unit pixels shown in FIG. 4 are used as they are in the specific display operation and the scan operation for convenience, and will be described with reference to FIGS. 4 and 5.

5 is a view for explaining a time division driving method of an image sensor-embedded liquid crystal display according to an exemplary embodiment of the present invention.

As shown, the liquid crystal display device with an image sensor according to the present invention includes a liquid crystal panel 100 for displaying an image, a backlight device 180 for supplying light thereto, and a controller 190 for controlling the image.

In such a structure, the liquid crystal panel 100 includes a plurality of unit pixels P having the structure illustrated in FIG. 4 in a matrix form, and the backlight device 180 is positioned as a rear surface of the liquid crystal panel 100. A plurality of LEDs 180a to 180c displaying three primary colors and an inverter (not shown) for supplying operating power thereto are provided. In addition, the controller 190 includes a plurality of driving circuits (not shown) for controlling the liquid crystal panel 100 and the backlight device 180.

In display driving, first, a control signal and a data signal are input to the controller 190 from the outside. The controller 190 enables the liquid crystal panel 100 according to the control signal, and adjusts the light transmittance of each unit pixel P according to the data signal to display the gray level of the image. In addition, the controller 180 sequentially controls the LEDs 180a to 180c corresponding to the three primary colors of R, G, and B through the backlight device 180 according to the control signal.

During scan driving, the scan object 200 is positioned at a predetermined distance in front of the liquid crystal panel 100, and reflects the light incident from the backlight device 180 to detect the shape of the scan object 200. .

More specifically, as described above, each unit pixel P includes a display pixel DP and a sensor pixel SP, and one horizontal line from the first horizontal line to the N (N is a natural number) horizontal line. Enable sequentially one by one.

Herein, the unit pixel P is assigned one of three colors of R, G, and B according to a designer's intention.

In addition, a period in which the entire shape of the scan object 200 is scanned once is defined as one frame and the process is divided into predetermined periods. Preferably, the three primary colors of R, G and B of the scan object are separately scanned in 1/3 frame.

At this time, in synchronization with the enable period of the unit pixels P, each of the LEDs 180a to 180c is turned on for 1/3 frame.

For example, in the case of scanning in the order of RGB colors, first, the control unit 190 controls the display pixels DP corresponding to the R color among the unit pixels P corresponding to the Nth horizontal lines of the liquid crystal panel 100. 1 The switching transistor T1 is turned on, and the first data signal corresponding to the maximum gradation is supplied through the first data line DLa connected to the display pixel DP corresponding to the R color. The light can be transmitted through the display pixel DP corresponding to the R color.

At the same time, among the unit pixels P corresponding to the N-th horizontal line, the first switching transistor T1 of the display pixels DP corresponding to the G and B colors is also turned on. The second data signal corresponding to the gray level is supplied through the first data line DLa connected to the display pixels DP corresponding to the G and B colors, respectively, so that the light may display the display pixels DP corresponding to the G and B colors. Do not penetrate through.

In addition, the R-color LED 180a of the backlight device 180 is turned on and supplied to the liquid crystal panel 100.

Accordingly, the R color light is irradiated to the scan object 200 through the display pixel DP in one horizontal line, and the light is proportional to the size of light corresponding to the gray level of the R color constituting the scan object 200. Reflected by the amount to be incident to the liquid crystal panel 100 again.

In this case, the reflected light is incident on the sensor pixel SP corresponding to the R color, and thus the charge corresponding to the reflected light size is stored in the second storage capacitor Cst2.

Thereafter, the second switching transistor T2 of the sensor pixel SP corresponding to the R color is turned on in the liquid crystal panel 100 to correspond to the R color through the second data line DLb. Supply the scanned data. In addition, the controller 190 performs data-writing on the storage means (not shown) provided to store the scanned data.

Here, light corresponding to the R color is scattered, and thus a predetermined amount may be incident on the phototransistor TP of the sensor pixel SP corresponding to the G and B colors. It is stored in the second storage capacitor Cst2 and enables the second gate line GLb to perform data-writing of the R-color scan data to the storage means (not shown) of the controller 190. As noise-data is input to the storage means (not shown) of the controller 190 at the same time, the reliability of the scan data is reduced.

To overcome this, when the data-writing of the R-color scan data is completed, the controller 190 controls the second of the sensor pixels SP corresponding to the G and B colors through the second data line DLb. The noise-data stored in the storage capacitor Cst2 is discharged.

This operation is sequentially performed for all horizontal lines, and then, as in the above-described operation, the sensor pixels SP corresponding to the G and B colors are enabled to generate scan data corresponding to the G and B colors. It records in the storage means (not shown) of the controller 190.

Therefore, the signal distortion problem caused by noise-data flowing into neighboring sensor pixels SP for each of the three primary colors of R, G, and B may be eliminated, thereby performing a more stable scanning operation.

6 is a flowchart illustrating a time division driving method of an image sensor-embedded liquid crystal display according to an exemplary embodiment of the present invention.

As shown in FIG. 1, in the step ST1 of enabling the Nth horizontal line, each of the three primary colors R, G, and B for one third frame is one frame when a period for displaying the shape of one screen is one frame. A step of enabling one horizontal line sequentially from the first horizontal line to the Nth horizontal line, wherein the first switching transistor of the display pixel is supplied by supplying a high signal to the gate line corresponding to the Nth horizontal line. It is a step of turning on (T1).

The scanning of one of the three primary colors (ST2) is a step of first scanning pixels corresponding to a color to one selected among the three primary colors of R, G, and B, and then sequentially scanning pixels corresponding to the remaining colors. When scanning a scan object in RGB order, the data signal of maximum gradation is first supplied to the first data line connected to the display pixel DP corresponding to the R color, and the display pixel corresponding to the remaining G and B colors. The data signal of the minimum gradation is supplied to the first data line connected to the DP.

The step ST3 of turning on the LED is a step of turning on the LED of the corresponding color in synchronization with the sensor pixel SP, in which case the step of turning on the R color LED.

Through this operation, only the portion corresponding to the R color of the scan object is detected and scan data is generated.

In the storing and discharging data (ST4), a high signal is supplied to a second gate line to turn on a second switching transistor, and the scan data is stored in a storage means of a controller through a second data line. Writing to data storage means.

At the same time, the controller is configured to discharge the noise-data detected by the sensor pixels SP corresponding to the remaining G and B colors.

The above operation should be performed for all three primary colors of R, G, and B, and according to whether all of the three primary colors of R, G, and B are scanned (S5-1), the steps ST1 to ST4 are repeated for the remaining 2/3 frames. The shape corresponding to each of the G and B colors is scanned, and the resultant G and B color scan data are stored in the storage means of the controller, respectively (ST5-2).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

Therefore, in the time-division driving method of the liquid crystal display device with an image sensor built-in according to the embodiment of the present invention, by dividing one frame into 1/3 frames and time-division driving sequentially, a higher contrast can be obtained during display driving. At the same time, the R, G, and B colors of the scan object are sequentially scanned, and one pixel among the pixels corresponding to the R, G, and B colors is first scanned and input to the storage means, and the noise-data generated in the other two pixels. discharge (noise-data) Therefore, it is possible to prevent distortion of the scan image by the noise-data, thereby implementing a more stable scan operation.

Claims (11)

Each liquid crystal panel includes first to third unit pixels including a display pixel connected to a first gate line, a sensor pixel connected to a second gate line, and first to third colors different from each other in the liquid crystal panel. In the driving method of the liquid crystal display device with a built-in image sensor comprising a backlight device comprising a first to a third light source for supplying the light of the white light to implement a white light, and a control unit for controlling the liquid crystal panel and the backlight device, Arranging a scan object on an upper portion of the liquid crystal panel; Scanning the shape of the scan object in response to light of the first to third colors sequentially passing through each of the first to third unit pixels; When the period of scanning the shape of the scan object is one frame, the time-division driving method of the liquid crystal display device with an image sensor, characterized in that scanning for one third frame period for each of the light of the first to third colors. . The method of claim 1, Scanning the shape of the scan object, Transmitting light of the first color through the display pixels of the first unit pixel; Reflecting the transmitted light of the first color from the scan object; Sensing light of the reflected first color in the sensor pixels of the first to third unit pixels; The light of the detected first color is stored as scan data through the sensor pixels of the first unit pixel, and the noise-data is stored as light of the detected first color through the sensor pixels of the second and third unit pixels. discharging as noise-data Time-division driving method of a liquid crystal display device with an image sensor comprising a. The method of claim 2, Transmitting the light of the first color through the display pixel of the first unit pixel, Supplying a high signal to the first gate line; Supplying a data signal of maximum gradation to a display pixel of the first unit pixel; Supplying a data signal having a minimum gray scale to the display pixels of the second and third unit pixels Time-division driving method of a liquid crystal display device with an image sensor comprising a. The method of claim 2, The light of the detected first color is stored as scan data in the sensor pixel of the first unit pixel, and the noise-data is stored in the light of the detected first color in the sensor pixels of the second and third unit pixels. -data) to discharge, Supplying a high signal to the second gate line; Storing the scan data sensed by the sensor pixel of the first unit pixel in the controller; Discharging the noise data detected by the sensor pixels of the second and third unit pixels in the controller; Time-division driving method of a liquid crystal display device with an image sensor comprising a. The method of claim 2, Scanning the shape of the scan object, Transmitting light of the second color through the display pixels of the second unit pixels; Reflecting the transmitted second color light from the scan object; Sensing light of the reflected second color in the sensor pixels of the first to third unit pixels; The light of the detected second color is stored as scan data in the sensor pixel of the second unit pixel, and the light of the detected second color in the sensor pixels of the first and third unit pixel is noise-data ( discharging as noise-data Time-division driving method of the liquid crystal display device with an image sensor further comprising a. 6. The method of claim 5, Scanning the shape of the scan object, Transmitting light of the third color through the display pixels of the third unit pixels; Reflecting the transmitted third color light from the scan object; Sensing light of the reflected third color in the sensor pixels of the first to third unit pixels; The light of the detected third color is stored as scan data through the sensor pixel of the third unit pixel, and the noise of the detected third color light through the sensor pixels of the first and second unit pixels. discharging as noise-data Time-division driving method of the liquid crystal display device with an image sensor further comprising a. delete The method of claim 1, Each of the display pixels may include a liquid crystal capacitor and a first storage capacitor having a grounded first electrode; A first switching transistor having a gate electrode connected to the first gate line, a source electrode connected to a first data line, and a drain electrode connected to the second electrode of the liquid crystal capacitor and the first storage capacitor; Time-division driving method of a liquid crystal display device with an image sensor comprising a. 9. The method of claim 8, Each of the sensor pixels may include a second storage capacitor having a first electrode grounded thereto, A second switching transistor having a gate electrode connected to the second gate line, a drain electrode connected to a second data line, and a source electrode connected to the second storage capacitor; A photo transistor having a gate electrode grounded, a source electrode connected to a driving power supply terminal, and a drain electrode connected to a source electrode of the second switching transistor; Time-division driving method of a liquid crystal display device with an image sensor comprising a. The method of claim 1, And the light of the first to third colors corresponds to an R color, a G color, and a B color, respectively. The method of claim 1, And the first to third light sources are LED lamps emitting light of R, G, and B colors, respectively.

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