KR101891711B1 - Display device and method for driving the same - Google Patents

Display device and method for driving the same Download PDF

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KR101891711B1
KR101891711B1 KR1020180035021A KR20180035021A KR101891711B1 KR 101891711 B1 KR101891711 B1 KR 101891711B1 KR 1020180035021 A KR1020180035021 A KR 1020180035021A KR 20180035021 A KR20180035021 A KR 20180035021A KR 101891711 B1 KR101891711 B1 KR 101891711B1
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South Korea
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plurality
touch
display panel
display
area
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KR1020180035021A
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Korean (ko)
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KR20180034370A (en
Inventor
추교혁
서정훈
황상수
김선엽
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엘지디스플레이 주식회사
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412Digitisers structurally integrated in a display
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices

Abstract

The present invention relates to a display device capable of reducing noise influence and sensing time by alternately driving an in-cell touch sensor and a display area by time division, and a driving method thereof.
A display device includes a display panel including a pixel array and a touch sensor array and having a plurality of display modes for writing data to the pixel array and a plurality of touch sensing modes for driving the touch sensor array, A first driver for driving a plurality of gate lines corresponding to a first area of a display panel among a plurality of gate lines during one display mode of the plurality of display modes, And a second driver for driving a plurality of touch sensors corresponding to a second area of the display panel among the plurality of touch sensors during a mode period. The size of the first area of the display panel, on which the plurality of gate lines are driven, Is smaller than the size of the second area of the display panel on which the touch sensors of the touch panel are driven and the second area of the display panel overlaps with the first area of the display panel .

Description

DISPLAY APPARATUS AND METHOD FOR DRIVING THE SAME

The present invention relates to a display device having a touch sensor and, more particularly, to a display device and a driving method thereof that can reduce a noise influence and a sensing time by driving a touch sensor and a display area built in a display device in a time- will be.

2. Description of the Related Art Today, a touch sensor (touch screen, touch panel) capable of inputting information by touching on the screen of various display devices is widely applied as an information input device of a computer system. The touch sensor allows the user to easily use the display information by simply touching the screen with a finger or a stylus to select or move the display information.

The touch sensor senses a touch and a touch position generated on the screen of the display device and outputs the touch information, and the computer system analyzes the touch information and executes an instruction. As a display device, a flat panel display device such as a liquid crystal display device, a plasma display panel, and an organic light emitting diode display device is mainly used.

As the touch sensor technology, there are resistance film type, capacitive type, optical type, infrared type, ultrasonic type, and electromagnetic type depending on the sensing principle. Generally, the touch sensor is manufactured in a panel form and attached to the upper part of the display device to perform a touch input function. However, the display device to which the touch sensor is attached requires the touch panel to be manufactured separately from the display device and attached to the display device. Therefore, the manufacturing cost is increased, the thickness and weight of the whole system are increased, There are following problems.

In order to solve this problem, an in-cell touch sensor in which a touch sensor is incorporated in a display device such as a liquid crystal display device or an organic light emitting diode display device has been developed. As the in-cell touch sensor, a photo-touch sensor that recognizes a touch according to the light intensity using a phototransistor and a capacitive touch sensor that recognizes a touch according to a capacitive variable are mainly used.

The photo-touch sensor recognizes the touch through the light leakage current of the phototransistor generated from incident light or reflected light by the touch object. The capacitive touch sensor recognizes a touch by a change in capacitance caused by a small amount of charge moving to a touch point when a conductor such as a human body or a stylus touches.

The touch sensor attached to the conventional display device is driven independently of the other devices such as the display device and the touch sensor, so that the display device and the touch sensor can be driven at the same time. However, since a touch sensor built in a pixel array of a display device in an in-cell manner can not drive the display device and the touch sensor at the same time, a new driving method for a display device having an in- Do.

The present invention provides a display device and a driving method thereof that can reduce noise influence and sensing time by time-divisionally driving an in-cell touch sensor and a display area alternately.

A display device according to an embodiment of the present invention includes a display panel in which a plurality of display modes for writing data to a pixel array and a plurality of touch sensing modes for driving the touch sensor array are alternately driven, A first driver for driving a plurality of gate lines corresponding to a first region of the display panel among a plurality of gate lines during a display mode of the touch panel, And a second driver for driving a plurality of touch sensors corresponding to a second area of the display panel among the sensors, wherein a size of the first area of the display panel, on which the plurality of gate lines are driven, The second area of the display panel overlaps with the first area of the display panel.
During one frame in which a plurality of display modes and a plurality of touch sensing modes are alternately driven, the first driver scans the gate lines of the first area of the display panel once, and the second driver scans the gate lines of the second area of the display panel The touch sensors can be scanned more than once.
The first driver is a gate driver for driving gate lines, and the second driver is a touch controller for driving touch sensors.
A display device according to an embodiment includes a data driver for driving data lines each time a gate line is driven in a display mode, and a mode switching signal for time-dividing one frame into a plurality of display modes and a plurality of touch sensing modes alternately And a timing controller for controlling the gate driver, the data driver, and the touch controller using the mode switching signal.
The gate driver and the data driver drive the pixels corresponding to the first area of the display panel in each display mode in response to the mode switching signal, and the touch controller, in response to the mode switching signal, As shown in Fig.
The timing controller further includes a memory for storing and outputting data in units of a first area of the display panel, and supplies data stored in the memory to the data driver at a frequency higher than a frequency at which data is stored in the memory, And generates a plurality of control signals for controlling the driving timings of the gate driver, the data driver, and the touch controller.
The display panel may be a liquid crystal display panel or an organic light emitting diode display panel, and the touch sensor may be a capacitive touch sensor that recognizes a touch according to a variable capacitance.
A method of driving a display device including a plurality of gate lines, a plurality of data lines, a pixel array including a plurality of pixels, and a touch sensor array including a plurality of touch sensors, A plurality of touch sensing modes for driving the touch sensor array and a display mode are alternately operated, and during a display mode period of one of the plurality of display modes, a plurality of And drives the plurality of touch sensors corresponding to the second area of the display panel among the plurality of touch sensors during one touch sensing mode of the plurality of touch sensing modes. Here, the size of the first area of the display panel on which the plurality of gate lines are driven is smaller than the size of the second area of the display panel on which the plurality of touch sensors are driven, and the second area of the display panel and the first area of the display panel Overlap.
The size of the first area of the display panel on which the plurality of gate lines are driven in the display device according to an embodiment is smaller than the size of the second area of the display panel on which the plurality of touch sensors are driven, The second driving unit does not apply the touch driving signal to the plurality of touch sensors corresponding to the second area of the display panel, and during the one touch sensing mode period, the first driving unit includes a plurality of gates The gate signal is not applied to the lines.

The display device having the touch sensor according to the present invention can minimize the mutual interference and noise influence between the pixel array driving and the touch sensor array driving by alternately driving the pixel array and the in-cell touch sensor array by time division, The sensing time can be minimized. Accordingly, the sensing ability and the sensing speed of the touch sensor can be improved.

1 is a block diagram schematically showing a driving apparatus of a display apparatus having a touch sensor according to an embodiment of the present invention.
2 is a sectional view showing a vertical structure of a display panel having the touch sensor shown in FIG.
3 is an equivalent circuit diagram showing an example of a display panel in which the touch sensor shown in Fig. 1 is incorporated.
4 is an equivalent circuit diagram showing another example of a display panel in which the touch sensor shown in Fig. 1 is incorporated.
5 is a driving waveform diagram of a display panel in which the touch sensor shown in Fig. 1 is incorporated.
FIGS. 6A to 6D sequentially illustrate driving regions of a display panel according to a sequential division driving sequence according to an embodiment of the present invention.

FIG. 1 is a block diagram schematically showing a display device having a touch sensor according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a vertical structure of the display panel 10 shown in FIG.

1 includes a display panel 10 in which a touch sensor TS is incorporated, a data driver 12 and a gate driver 14 for driving the display panel 10, a data driver A timing controller 16 for controlling the panel driver including the gate driver 12 and the gate driver 13 and a touch controller 20 for driving the touch sensor TS in the display panel 10. The timing controller 16 and the touch controller 20 are connected to the host system 30.

Here, the timing controller 16 and the data driver 12 may be integrated into each IC (Integrated Circuit), or the timing controller 16 may be embedded in the data driver 12 and integrated into one IC. The touch controller 20 and the timing controller 16 may be integrated into respective ICs or the touch controller 20 may be embedded in the timing controller 16 and integrated into one IC.

As the display panel 10, a flat panel display panel such as a liquid crystal display panel (hereinafter referred to as a liquid crystal panel), a plasma display panel, and an organic light emitting diode display panel can be mainly used. Hereinafter, a liquid crystal panel will be described as an example. 2, the display panel 10 includes a color filter substrate 42 on which a color filter array 40 is formed, a thin film transistor array 44 on which a color filter array 40 is formed, The liquid crystal layer 48 between the color filter substrate 44 and the thin film transistor substrate 46 and the liquid crystal layer 48 between the color filter substrate 44 and the thin film transistor substrate 46 Upper and lower polarizing plates 50 and 52 respectively attached to outer side surfaces thereof, and a tempered glass substrate 54 attached on the upper polarizing plate 50. The liquid crystal layer 48 may be driven by a vertical electric field such as a TN (Twisted Nematic) mode or a VA (Vertical Alignment) mode or by a horizontal electric field such as an IPS (In-Plane Switching) mode or an FFS (Fringe Field Switching) .

The display panel 10 includes a pixel array in which a plurality of pixels are arranged and a touch sensor array in which a plurality of touch sensors (TS) are arranged in the pixel array.

Each pixel of the pixel array implements a desired color by a combination of red, green, and blue sub-pixels that adjust the light transmittance by varying the liquid crystal array according to the data signal. Each sub-pixel PX includes a thin film transistor connected to the gate line GL and the data line DL, a liquid crystal capacitor connected in parallel with the thin film transistor, and a storage capacitor. The liquid crystal capacitor charges the difference voltage between the data signal supplied to the pixel electrode through the thin film transistor and the common voltage supplied to the common electrode, and drives the liquid crystal according to the charged voltage to adjust the light transmittance. The storage capacitor stably maintains the voltage charged in the liquid crystal capacitor.

The touch sensor array includes a plurality of touch sensors TS connected to a sensor drive line SL and a lead-out line ROL. Each touch sensor (TS) can use a photo-touch sensor that recognizes a touch according to light intensity using a phototransistor, and a capacitive touch sensor that recognizes a touch according to a capacitive variable. The photo-touch sensor recognizes the touch through the light leakage current of the phototransistor generated from incident light or reflected light by the touch object. The capacitive touch sensor recognizes a touch by a change in capacitance caused by a small amount of charge moving to a touch point when a conductor such as a human body or a stylus touches. For example, the capacitive touch sensor TS varies the capacitance by forming the touch object and the touch capacitor Cf as shown in FIG. 2, and outputs a signal corresponding to the capacitance change through the lead-out line ROL . The touch sensor TS is formed by a plurality of pixels in consideration of the size of the touch point of about 3 to 5 mm. For example, when the line width of the touch point is about 4 mm, the touch sensor TS can be formed in about 50 pixel units.

The display panel 10 incorporating the touch sensor TS is divided into a display mode DM for recording data in the pixel array and a touch sensing mode SM for driving the touch sensor array, . To this end, the pixel array and the touch sensor array are divided into a plurality of block units, and the pixel block and the touch sensor block are alternately and sequentially driven.

The host system 30 supplies image data and a plurality of synchronous signals to the timing controller 16, analyzes the touch information input from the touch controller 20, and executes commands.

The timing controller 16 processes the video data input from the host system 30 and supplies the video data to the data driver 12. [ For example, in order to improve the response speed of the liquid crystal, the timing controller 11 corrects the data by overdriving driving to add an overshoot value or an undershoot value according to the data difference between adjacent frames, can do. The timing controller 16 controls the driving timing of the data driver 12 using a plurality of synchronizing signals input from the host system 30, that is, a vertical synchronizing signal, a horizontal synchronizing signal, a data enable signal, And a gate control signal for controlling the driving timing of the gate driver 14 and outputs the data control signal and the gate control signal to the data driver 12 and the gate driver 14, respectively. The data control signal includes a source start pulse and a source sampling clock for controlling the latch of the data signal, a polarity control signal for controlling the polarity of the data signal, and a source output enable signal for controlling the output period of the data signal. The gate control signal includes a gate start pulse and gate shift clock for controlling the scanning of the gate signal, a gate output enable signal for controlling the output period of the gate signal, and the like.

Particularly, the timing controller 16 time-divides each frame into a plurality of display modes DM and a plurality of touch sensing modes SM as shown in FIG. 5, alternately displays the display mode DM and the touch sensing mode SM A mode switching signal for switching a mode between the display mode DM and the touch sensing mode SM is generated to sequentially control the data driver 12 and the gate driver 14 and the touch controller 20. The timing controller 16 controls the data driver 12 and the gate driver 14 to be driven in the display mode DM and controls the touch controller 20 to be driven in the touch sensing mode SM. In addition, the timing controller 16 stores and outputs image data on a block-by-block basis in the memory 18 in order to time-division-drive the display panel 10 in units of a plurality of blocks. In order to secure the time for driving the touch sensor without increasing the period of each frame, the pixel array is driven at a period shorter than the normal period. The timing controller 16 controls the clock frequency for reading data from the memory 18 faster than the clock frequency for storing data in the memory 18 and controls the data driver 12 and the gate driver 14 The frequency of the data control signal and the gate control signal to be controlled are controlled quickly. For this purpose, the frequency of the vertical synchronizing signal, the horizontal synchronizing signal, the data enable signal and the dot clock, which are a plurality of synchronizing signals, is controlled faster than the input frequency from the host system. For example, the timing controller 16 controls the data driver 12 and the gate driver 14 at 100 Hz, 120 Hz, 180 Hz, etc., which is faster than 60 Hz, which is a normal frame frequency. The timing controller supplies at least one synchronizing signal controlled at a high frequency to the touch controller 20 to control the touch controller 20 to drive the touch sensor array at a high speed. Here, the memory 18 may be embedded in the timing controller 16 or may be externally mounted.

The gate driver 14 divides a plurality of gate lines GL formed in the thin film transistor array of the display panel 10 in block units in response to a gate control signal and a mode switching signal from the timing controller 16, And sequentially drives the gate lines GL in the corresponding block for each data line DM. To this end, the gate driver 14 may be divided into a plurality of blocks, and each of the plurality of blocks may initiate a scanning operation in response to a mode switching signal for each display mode DM. The gate driver 14 does not drive the gate line GL in the touch sensing mode SM in response to the mode switching signal. The gate driver 16 supplies the gate-on voltage for the corresponding scan period of each gate line GL and supplies the gate-off voltage for the remaining period. The gate driver 14 includes at least one gate IC and is mounted on a circuit film such as a tape carrier package (TCP), a chip on film (COF), or a flexible printed circuit (FPC) Automatic bonding, or may be mounted on the display panel 10 in a COG (Chip On Glass) manner. In addition, the gate driver 14 may be formed on the thin film transistor substrate together with the pixel array and the touch sensor array by being embedded in the display panel 10 in a GIP (Gate In Panel) manner.

The data driver 12 supplies a data signal to a plurality of data lines DL of the display panel 10 in each display mode DM in response to a data control signal and a mode switching signal from the timing controller 16. [ The data driver 12 does not drive the data line DL in the touch sensing mode SM in response to the mode switching signal. The data driver 12 converts the digital data input from the timing controller 16 into a positive / negative analog data signal by using a gamma voltage, and outputs a data signal to the data line DL). The data driver 12 includes at least one data IC and is mounted on a circuit film such as TCP, COF, FPC or the like to be attached to the display panel 10 by TAB (Tape Automatic Bonding) On the display panel 10 as shown in Fig.

The touch controller 20 time-divisionally drives the touch sensor array for each touch sensing mode SM in response to at least one synchronizing signal and a mode switching signal from the timing controller 16, Out signal output through the ROL, and calculates the touch coordinates and supplies the touch coordinates to the host system 30. To this end, the touch controller 20 includes a lead-out circuit for generating sensing data using a lead-out signal input from the touch sensor TS, SM), a signal processor for driving the touch sensor array (i.e., the sensor driving line) in a time division manner and calculating the touch coordinate value using the sensing data from the lead-out circuit. The lead-out circuit includes an amplifier for generating a sensing signal indicative of whether or not the lead-out signal is compared with a preset reference voltage, an analog-to-digital converter (ADC) for converting the analog sensing signal into digital sensing data, Converter (ADC). The signal processor calculates the touch coordinate value (XY coordinate) based on the position information (X coordinate) of the lead-out line ROL and the position information (Y coordinate) of the driven sensor driving line SL. The touch controller 20 does not drive the touch sensor array in the display mode DM in response to the mode switching signal.

Fig. 3 shows an equivalent circuit diagram of the display panel 10 according to the embodiment shown in Fig. 1, specifically showing an equivalent circuit of a liquid crystal panel incorporating a photo-touch sensor (PTS).

The photo-touch sensor (PTS) shown in Fig. 3 is built in the pixel array of the liquid crystal panel. Each sub-pixel includes a pixel thin film transistor Tpx formed in each pixel region defined by intersecting the gate line GL and the data line DL, a liquid crystal capacitor Clc connected in parallel with the pixel thin film transistor Tpx, And a capacitor Cst. The liquid crystal capacitor Clc is composed of a pixel electrode connected to the thin film transistor Tpx, a common electrode for supplying a common voltage, and a liquid crystal layer to which a vertical electric field or a horizontal electric field is applied by the pixel electrode and the common electrode. The pixel thin film transistor Tpx stores a data signal from the data line DL in the liquid crystal capacitor Clc and the storage capacitor Cst in response to a gate signal from the corresponding gate line GL. The liquid crystal is driven according to the data signal stored in the liquid crystal capacitor Clc, and the storage capacitor Cst maintains the data signal stably by the liquid crystal capacitor Clc.

The photoelectric touch sensor PTS includes a sensor thin film transistor Tss for sensing a touch in accordance with light intensity and a bias line BL for supplying a bias voltage to the sensor thin film transistor Tss A switch thin film transistor Tsw for outputting a signal stored in the storage capacitor Cst2 and a switch thin film transistor Tsw connected to the switch thin film transistor Tsw And a lead-out line ROL.

The gate electrode and the first electrode of the sensor thin film transistor Tss are connected to the bias line BL, and the second electrode is connected to the storage capacitor Cst2. The first and second electrodes may be a source electrode and a drain electrode depending on a current direction. The storage capacitor Cst2 is connected between the second electrode of the sensor thin film transistor Tss and the gate electrode. In the switch thin film transistor Tsw, the gate electrode is connected to the gate line GL, and the first and second electrodes are connected to the storage capacitor Cst2 and the lead-out line ROL, respectively.

The sensor thin film transistor Tss generates a light leakage current in response to the light intensity of the incident light or the reflected light by the touch, and stores the light leakage current in the storage capacitor Cst2. The switch thin film transistor Tsw outputs the voltage stored in the storage capacitor Cst2 to the readout line ROL in response to the gate signal of the gate line GL. Accordingly, the photo-touch sensor PTS outputs a signal indicating whether or not the touch is on the lead-out line ROL according to the intensity of incident light or reflected light.

FIG. 4 is an equivalent circuit diagram of the display panel 10 according to another embodiment shown in FIG. 1, specifically showing an equivalent circuit of a liquid crystal panel incorporating a capacitive touch sensor (CTS).

The capacitive touch sensor (CTS) shown in Fig. 4 is embedded in the pixel array of the liquid crystal panel. Each sub-pixel includes a pixel thin film transistor Tpx connected to the gate line GL and the data line DL and a liquid crystal capacitor Clc and a storage capacitor Cst connected in parallel to the pixel thin film transistor Tpx, .

The capacitive touch sensor CTS includes a sensing electrode 20 for forming a sensing object and a sensing capacitor Cf, a pair of sensor gate lines SGLa and SGLb (sensor driving line SL in FIG. 1) A first switch thin film transistor Tsw1 for forming a current path between the power line PL and one end of the sensing electrode 20 in response to the control of the sensor gate line SGLa and a second switch thin film transistor Tsw2 for controlling the second sensor gate line SGLb And a second switch thin film transistor Tsw2 which forms a current path between the lead out line ROL and the other end of the sensing electrode 20 in response to the control signal. Here, the power line PL may be omitted by replacing it with a common line connected to the common electrode of the storage capacitor Cst.

The first switch thin film transistor Tsw1 has a gate electrode connected to the first sensor gate line SGLa and a first electrode connected to the power line PL and a second electrode connected to one end of the sensing electrode 20 do. Each of the first and second electrodes is a source electrode and a drain electrode in accordance with the current direction. The gate electrode of the second switch thin film transistor Tsw2 is connected to the second sensor gate line SGLb and the first electrode thereof is connected to the lead-out line ROL. The first electrode is connected to the other end of the sensing electrode 20 Respectively. Each of the first and second electrodes is a source electrode and a drain electrode in accordance with the current direction.

The first switch thin film transistor Tsw1 responds by the gate signal of the first sensor gate line SGLa and supplies the drive voltage Vd from the power line PL to the sensing electrode 20. At this time, when the touch object touches the surface of the liquid crystal display device, a sensing capacitor (Cf) is formed between the touch object and the sensing electrode (20). The second switch thin film transistor Tsw2 responds to the gate signal of the second sensor gate line SGLb and supplies a signal corresponding to the amount of charge induced to the sensing electrode 20 through the touch capacitor Cf to the lead out line ROL.

5 is a driving waveform diagram of the display panel 10 incorporating the touch sensor shown in Fig.

Referring to FIG. 5, one frame (60 Hz, 16.7 ms) is time-divided into a plurality of display modes DM and a plurality of touch sensing modes SM, and the display mode DM and the touch sensing mode SM are alternately . A plurality of gate lines GL of the corresponding block are sequentially driven by the respective scan pulses SP1 in each display mode DM and a plurality of sensing drive lines SL of the corresponding block in each touch sensing mode SM Is driven by each scan pulse SP2, and this display mode DM and the touch sensing mode SM are alternately repeated. The number of gate lines GL driven in each display mode DM and the number of sensor drive lines SL driven in the touch sensing mode SM can be set differently, May be equal to or different from the duration of each touch sensing mode SM.

For example, assuming that there are 16 sensor drive lines SL, one frame is divided into 16 display modes DM1 to DM16 and 16 touch sensing modes SM1 to SM6, The touch sensing mode SM is alternately and sequentially driven. Here, each period of the touch sensing modes SM1 to SM6 is set by experimentally calculating a maximum time for sensing sensing. For example, if one frame of 16.7 ms is changed to DM1 (0.5 ms) -> SM1 (0.5 ms) -> DM2 (0.5 ms) -> SM2 (0.5 ms) (0.5 ms) -> blank period (0.7 ms).

6A to 6D illustrate examples in which the display panel 10 is divided into 16 blocks and sequentially driven in 16 display modes DM1 to DM16 and 16 touch sensing modes SM1 to SM16 to be.

6A to 6D, in each of the 16 display modes DM1 to DM16, pixels included in one block are driven, whereas 16 pixels in each of the 16 touch sensing modes SM1 to SM16 are included in four blocks The touch sensors are driven. Accordingly, since the pixel array is scanned once in one frame and the touch sensor array is scanned four times, the touch sensing ability and the sensing speed can be increased.

6A, the pixels in the first block # 1 are driven in the first display mode DM1, and then the first to fourth blocks # (# 1 to # 4) are driven. The pixels in the second block (# 2) in the second display mode DM2 are driven and the touch in the fifth to eighth blocks (# 5 to # 8) in the second touch sensing mode SM2 The sensors are driven. The pixels in the third block (# 3) are driven in the third display mode DM3 and the touch in the ninth to twelfth blocks (# 9 to # 12) in the third touch sensing mode SM4 The sensors are driven. The pixels in the fourth block (# 4) are driven in the fourth display mode DM4 and the touch in the thirteenth to the sixteenth blocks (# 13 to # 16) in the period of the fourth touch sensing mode SM4 The sensors are driven.

6B, in the period of the fifth display mode DM5, the pixels in the fifth block # 5 are driven. Then, in the period of the sixth touch sensing mode SM6, the first through fourth blocks # 1 to # 4 are driven. The pixels in the sixth block (# 6) are driven in the period of the sixth display mode DM6 and then the touch in the fifth to eighth blocks (# 5 to # 8) in the period of the sixth touch sensing mode SM6 The sensors are driven. The pixels in the seventh block (# 7) in the seventh display mode DM7 are driven and the touch in the ninth to twelfth blocks (# 9 to # 12) in the seventh touch sensing mode SM7 The sensors are driven. The pixels in the eighth block (# 8) are driven in the period of the eighth display mode DM8 and the touch in the thirteenth to the sixteenth blocks (# 13 to # 16) in the period of the eighth touch sensing mode SM8 The sensors are driven.

6C, in the period of the ninth display mode DM9, the pixels in the ninth block # 9 are driven, and in the period of the ninth touch sensing mode SM9, the first through fourth blocks # 1 to # 4 are driven. The pixels in the tenth block (# 10) in the tenth display mode DM10 are driven and the touch in the fifth to eighth blocks (# 5 to # 8) in the tenth touch sensing mode SM10 The sensors are driven. The pixels in the eleventh block (# 11) are driven in the period of the eleventh display mode DM11 and the touch in the ninth to twelfth blocks (# 9 to # 12) in the period of the eleventh touch sensing mode SM11 The sensors are driven. The pixels in the twelfth block (# 12) are driven in the period of the twelfth display mode DM12 and the touch in the thirteenth to sixteenth blocks (# 13 to # 16) in the period of the twelfth touch sensing mode SM12 The sensors are driven.

6D, in the period of the thirteenth display mode DM13, the pixels in the thirteenth block (# 13) are driven, and in the period of the thirteenth touch sensing mode SM13, the first through fourth blocks # 1 to # 4 are driven. The pixels in the fourteenth block (# 14) are driven in the period of the fourteenth display mode DM14 and the touch in the fifth to eighth blocks (# 5 to # 8) in the period of the fourteenth touch sensing mode SM14. The sensors are driven. The pixels in the fifteenth block (# 15) in the period of the fifteenth display mode DM15 are driven and the touch in the ninth to twelfth blocks (# 9 to # 12) in the period of the fifteenth touch sensing mode SM15 The sensors are driven. The pixels in the sixteenth block (# 16) are driven in the period of the sixteenth display mode DM16 and the touch in the thirteenth to sixteenth blocks (# 13 to # 16) in the period of the sixteenth touch sensing mode The sensors are driven.

As described above, in the display device having the touch sensor and the driving method thereof according to the present invention, the pixel array and the in-cell touch sensor array are time-divisionally driven alternately so that the mutual interference between the pixel array driving and the touch sensor array driving and the noise influence And the touch sensing time can be minimized. Accordingly, the sensing ability and the sensing speed of the touch sensor can be improved.

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. Will be clear to those who have knowledge of.

10: display panel 12: data driver
14: Gate driver 16: Timing controller
20: touch controller 30: host system
40: Color filter array 42: Color filter substrate
44: thin film transistor array 45: touch sensor array
46: thin film transistor substrate 48: liquid crystal layer
50, 52: Polarizing plate 54: Tempered glass substrate
PX: Sub-pixel TS: Touch sensor
PTS: Photo touch sensor CTS: Capacitive touch sensor
DM: Display mode SM: Touch sensing mode

Claims (11)

  1. A display device, comprising: a plurality of gate lines; a plurality of data lines; a pixel array including a plurality of pixels; and a touch sensor array including a plurality of touch sensors, A display panel in which a plurality of touch sensing modes for driving the sensor array are alternately driven;
    A first driver for driving a plurality of gate lines corresponding to a first region of the display panel among the plurality of gate lines during one display mode of the plurality of display modes; And
    And a second driver for driving a plurality of touch sensors corresponding to a second area of the display panel among the plurality of touch sensors during one touch sensing mode of the plurality of touch sensing modes;
    The size of the first area of the display panel on which the plurality of gate lines are driven is smaller than the size of the second area of the display panel on which the plurality of touch sensors are driven,
    And the second region of the display panel overlaps with the first region of the display panel.
  2. The method according to claim 1,
    During one frame in which the plurality of display modes and the plurality of touch sensing modes are alternately driven,
    Wherein the first driver scans the gate lines of the first area of the display panel once,
    Wherein the second driver scans the touch sensors of the second area of the display panel more than twice.
  3. The method of claim 2,
    Wherein the first driver is a gate driver for driving the gate lines,
    Wherein the second driver is a touch controller for driving the touch sensors,
    A data driver for driving the data lines each time the gate line is driven in the display mode;
    Generating a mode switching signal for time-dividing the frame in such a manner that the plurality of display modes and the plurality of touch sensing modes alternate, and controlling timing of controlling the gate driver, the data driver and the touch controller using the mode switching signal A display device further comprising a controller.
  4. The method of claim 3,
    Wherein the gate driver and the data driver drive pixels corresponding to a first region of the display panel in each display mode in response to the mode switching signal;
    Wherein the touch controller drives the touch sensors corresponding to the second area of the display panel in each of the touch sensing modes in response to the mode switching signal.
  5. The method of claim 3,
    The timing controller
    Further comprising a memory for storing and outputting data in units of a first area of the display panel and supplying data stored in the memory to the data driver at a frequency higher than a frequency at which data is stored in the memory;
    And generates a plurality of control signals for controlling the driving timings of the gate driver, the data driver, and the touch controller by converting a plurality of input synchronizing signals to frequencies faster than the input frequency.
  6. The method according to claim 1,
    Wherein the display panel is a liquid crystal display panel or an organic light emitting diode display panel.
  7. The method according to claim 1,
    Wherein the touch sensor is a capacitive touch sensor that recognizes a touch according to a variable capacitance.
  8. A method of driving a display device including a plurality of gate lines, a plurality of data lines, a pixel array including a plurality of pixels, and a touch sensor array including a plurality of touch sensors,
    Alternately driving a plurality of display modes for writing data to the pixel array and a plurality of touch sensing modes for driving the touch sensor array;
    Driving a plurality of gate lines corresponding to a first region of the display panel among the plurality of gate lines during one display mode period of the plurality of display modes;
    Driving a plurality of touch sensors corresponding to a second area of the display panel among the plurality of touch sensors during one of the plurality of touch sensing modes;
    The size of the first area of the display panel on which the plurality of gate lines are driven is smaller than the size of the second area of the display panel on which the plurality of touch sensors are driven,
    And the second region of the display panel overlaps with the first region of the display panel.
  9. The method of claim 8,
    During one frame in which the plurality of display modes and the plurality of touch sensing modes are alternately driven,
    The gate lines of the first area of the display panel are scanned once,
    Wherein the touch sensors of the second area of the display panel are scanned twice or more.
  10. The method of claim 9,
    Wherein the frame is time-divided by the mode switching signal such that the plurality of display modes and the plurality of touch sensing modes are alternated,
    The pixels of the first area of the display panel are driven in the respective display modes indicated by the mode switching signal,
    Wherein the touch sensors in the second area of the display panel are driven in the respective touch sensing modes indicated by the mode switching signal.
  11. A display device, comprising: a plurality of gate lines; a plurality of data lines; a pixel array including a plurality of pixels; and a touch sensor array including a plurality of touch sensors, A display panel in which a plurality of touch sensing modes for driving the sensor array are alternately driven;
    A first driver for applying a gate signal for displaying an image to a plurality of gate lines corresponding to a first region of the display panel among the plurality of gate lines during one display mode of the plurality of display modes; And
    And a second driver for applying a touch driving signal to a plurality of touch sensors corresponding to a second area of the display panel among the plurality of touch sensors during one touch sensing mode of the plurality of touch sensing modes, ;
    The size of the first area of the display panel on which the plurality of gate lines are driven is smaller than the size of the second area of the display panel on which the plurality of touch sensors are driven,
    During the one display mode period, the second driving unit does not apply the touch driving signal to the plurality of touch sensors corresponding to the second area of the display panel,
    Wherein the first driver does not apply the gate signal to a plurality of gate lines corresponding to a first region of the display panel during the one touch sensing mode period.
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