KR20160068643A - Touch display device and method of driving the same - Google Patents

Abstract

Provided are a touch display device and an operation method thereof. According to the present invention, the touch display device may avoid line dim malfunction. The touch display device provides an image data voltage to a display panel per the N number of display active periods and stabilizes data lines by providing a free data voltage to the display panel during a touch sensing period and a free data period, wherein the touch sensing period is allocated in succession to each of the N number of display active periods, and the free data period is inserted between the next display active period.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch display device and a method of driving the touch display device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch display device and a driving method thereof, and more particularly to a touch display device capable of preventing a line dim defect and a driving method thereof.

The touch panel is an input device that allows a user to input a command by selecting an instruction content displayed on a screen of a display device or the like as a human hand or an object. That is, the touch panel converts a contact position directly touching a human hand or an object into an electrical signal, and the instruction content selected at the contact position is accepted as an input signal. Such a touch panel can be replaced with a separate input device connected to a display device such as a keyboard and a mouse, and the use range thereof is gradually expanding.

In general, such a touch panel is generally attached to a front surface of a display device such as a liquid crystal display device or an organic light emitting display device to be commercialized. In recent years, however, in order to reduce the size of the touch panel, A display device (In-Cell Touch Display) has been developed.

Since the in-cell touch display device includes pixels for driving an image and touch sensors for touch sensing, the display period (TD) and the touch sensing period (TS) are temporally divided and driven. That is, when dividing the display panel into a plurality of display blocks, the display period (TD) and the touch sensing period (TS) are alternately driven many times for one frame as shown in FIG.

However, when switching from the touch sensing period TS to the display period TD, the pixel located at the first horizontal line of the (k + 1) th display block at k + 1 (where k is at least one natural number) Th horizontal line, the pixel located in the first horizontal line of the (k + 1) -th display block is strongly charged or approximately charged. That is, when the polarities of the data voltages supplied to the last horizontal line of the kth display block and the first horizontal line of the (k + 1) th display block are different, the pixel of the first horizontal line of the (k + Level gamma voltage so that the battery is charged with a strong voltage. If the polarities of the data voltages supplied to the last horizontal line of the k-th display block and the first horizontal line of the (k + 1) th display block are the same, the pixel of the first horizontal line of the (k + Level gamma voltage, so that it is charged.

Accordingly, a luminance difference is generated between the last horizontal line of the k-th display block and the first horizontal line of the (k + 1) -th display block, resulting in a line dim phenomenon in which a horizontal stripe is recognized.

SUMMARY OF THE INVENTION The present invention provides a touch display device and a method of driving the touch display device which can prevent a line dim defect in order to solve the above problems.

A touch display apparatus and a method of driving the same according to an embodiment of the present invention are characterized by supplying a video data voltage to a display panel for every N display active periods and for each touch sensing period subsequent to each of the N display active periods, The pre-data voltage is supplied to the display panel in the pre-data period inserted between the display active periods subsequent thereto.

The pre-data voltage may be the video data voltage supplied to at least one horizontal line including the last horizontal line of the k-th display block during the k-th (k is 1 < k &lt; N) . The overdriving voltage may be preset to a data voltage having a relatively large amplitude or may be determined as a data voltage having a larger amplitude than the data voltage for the image data according to the image data to be supplied to the (k + 1) th display block.

The touch display device according to an embodiment of the present invention includes a pre-data period inserted between each touch sensing period and a display active period for time-division driving a plurality of display blocks to supply data lines with a pre- It can be stabilized to a state necessary for charging. Thus, it is possible to prevent the occurrence of a line dim phenomenon due to the difference in luminance between the last horizontal line of the previous display block and the first horizontal line of the current display block.

The touch display apparatus according to an embodiment of the present invention can shorten the time for stabilizing the data lines by supplying the overdriving voltage as the free data voltage in the free data period. As a result, the free data period is shortened and the touch sensing period can be further secured by the shortening period, so that the touch sensing performance can be improved.

1 is a view for explaining a driving method of a conventional touch-type display device.
2 is a block diagram showing a touch-type display device according to an embodiment of the present invention.
FIG. 3 is a plan view showing a display panel according to an embodiment of the present invention with a touch electrode as a center.
4 is a block diagram illustrating a timing controller according to an exemplary embodiment of the present invention.
5A and 5B are diagrams illustrating a data output period of the data driver according to an embodiment of the present invention.
6 is a waveform diagram for explaining a method of driving a touch-type display device according to an embodiment of the present invention.
7 is a waveform diagram for explaining another driving method of a touch-type display device according to an embodiment of the present invention.
8 is a block diagram illustrating a touch-integrated display device according to an embodiment of the present invention.
9 is a view for explaining a method of driving a touch-integrated display device according to an embodiment of the present invention.
10 is a block diagram mainly showing a data path in the internal configuration of the timing controller according to the embodiment of the present invention.
FIG. 11 is a simulation waveform diagram showing a comparison result of driving the touch-type display device according to the above-described embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view illustrating a touch display device according to an embodiment of the present invention.

2 is provided with a display panel 102, a display drive circuit 100 for driving each pixel of the display panel 102, And a touch driving circuit (110).

In the display panel 102, a plurality of pixels are arranged in a matrix form to display an image. The display panel 102 may be, for example, an organic light emitting display panel or a liquid crystal display panel. In the present invention, a liquid crystal display panel is taken as an example.

For example, in the display panel 102, a thin film transistor (TFT), a thin film transistor (TFT), and a thin film transistor (TFT) are provided for each region provided at the intersection of the gate lines GL and the data lines DL, The connected liquid crystal cells Clc are formed, and the touch sensors Cm are formed.

Each of the liquid crystal cells Clc has a pixel electrode connected to the thin film transistor TFT and a common electrode formed between the pixel electrode and the liquid crystal and forming an electric field with the pixel electrode.

Each of the touch sensors Cm is formed between the Tx electrodes 140 and the Rx electrodes 150 and is implemented as mutual capacitance in equivalent circuit.

Each of the Tx electrodes 140 may be formed to overlap with a plurality of pixels. These Tx electrodes 140 are patterned on the same substrate as the pixel electrodes and used as common electrodes. A plurality of Tx electrodes 140 located on the same horizontal (or vertical) line are connected to one Tx line TL.

Each of the Rx electrodes 150 is patterned on the same substrate as the pixel electrode and used as a common electrode or separately formed electrode. A plurality of Rx electrodes 150 located on the same vertical (or horizontal) line are connected to one Rx line RL.

The touch driving circuit 110 includes a Tx driving circuit 114, an Rx driving circuit 112, and a touch control unit 116.

The Tx driving circuit 114 supplies a touch driving signal to each of the Tx electrodes 140 through each of the Tx lines TL. Specifically, the Tx driving circuit 114 selects the Tx line TL to output the touch driving signal in response to the Tx setup signal input from the touch control unit 116, and outputs a touch driving signal to the selected Tx line TL Supply. A touch driving signal is supplied to each of the Tx electrodes 140 through each of the Tx lines TL.

The Rx driving circuit 112 selects the Rx lines RL to receive the charge variation of the touch sensor Cm in response to the Rx set-up signal input from the touch controller 116. [ The Rx driving circuit 112 converts the charge variation of the touch sensor Cm received through the Rx lines R1 to Rv into touch data and outputs the touch data.

The touch control unit 116 receives a Tx setup signal for setting the Tx line TL to which the touch driving signal is output from the Tx driving circuit 114 and a Tx setup signal for setting the Tx line TL for receiving the charge variation amount of the touch sensors Cm in the Rx driving circuit 112 Generates an Rx setup signal for setting the Rx line RL and synchronizes the operation timings of the Tx driving circuit 114 and the Rx driving circuit 112. [

The touch control unit 116 generates touch sensing information TCD including touch coordinates using the touch data received from the Rx driving circuit 112 and transmits the touch sensing information TCD to the host system 104. [ Lt; / RTI &gt;

The host system 104 may be implemented as any one of a navigation system, a set top box, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, a broadcast receiver, and a phone system. The host system 104 converts the input data RGB into a format suitable for display on the display panel 102, including a system on chip (SoC) with a built-in scaler. The host system 104 transmits the timing signals together with the input data (RGB) to the timing controller 120. The host system 104 analyzes the touch sensing information TCD input from the touch control unit 116 and executes an application program associated with the coordinates at which the touch occurs.

The display drive circuit 100 includes a data driver 108, a gate driver 106, and a timing controller 120.

The gate driver 106 responds to the gate control signal GCS from the timing controller 120 to apply the gate voltages VGH and VGL in the high or low state to the gate lines GL formed in the display panel 102 Supply.

The timing control unit 120 includes a data input unit 122, an image processing unit 124, a line buffer unit 130, a control signal generation unit 128, and a data output unit 126, as shown in FIG.

The data input unit 122 receives input data RGB and a plurality of timing signals, for example, a dot clock Clk, an input data enable signal And supplies the received input data RGB and timing signals to the image processing unit 124 and outputs the timing signals to the control signal generating unit 128. [ .

The control signal generator 128 generates a plurality of gate control signals GCS and a data driver 108 for controlling the driving timing of the gate driver 106 using a plurality of timing signals input from the data input unit 122, And generates a plurality of data control signals (DCS) for controlling the driving timing of the data control signals DCS. The control signal generator 128 outputs the gate control signals GCS to the gate driver 106 and the data control signals DCS to the data driver 108 through the data output unit 126.

The image processing unit 124 performs various image processing for enhancing the image quality or reducing power consumption of the image data RGB by using the image data RGB and the plurality of timing signals input from the data input unit 122, And outputs the processed image data (DATA) to the data driver (108) through the data output unit (126). The image processor 124 outputs the image data DATA to be supplied to the corresponding display block to the data output unit 126 and the line buffer 130 in each display active period TD.

The control signal generator 128 generates video data DATA to be used in each of the display active period TD and the touch sensing period TS as shown in FIGS. 5A and 5B by using the input data enable signal DEi. And the output data enable signal DEo for controlling the output timing of the free data Pre. Here, the free data Pre is image data supplied to at least one horizontal line including the last horizontal line of the corresponding display block during each display active period (TD). For example, the pre-data (Pre) is image data supplied from the (i-2) th horizontal line to the i-th horizontal line (last horizontal line) in the previous display block as shown in Figs. 5A and 5B.

In the first logic section HL1 of the output data enable signal DEo shown in FIG. 5A, the video data assigned to the display active period TD is output through the data output section 126, The pre-data (Pre) allocated to a part of the touch sensing period (TS) is output through the data output unit (126).

The output data enable signal DEo shown in FIG. 5B includes first and second data enable signals DE1 and DE2. In the first logic period HL1 of the first data enable signal DE1, the video data assigned to the display active period TD is output through the data output unit 126, and the remaining logic period is the touch sensing period TS). In the second logic section HL2 of the second data enable signal DE2, the free data Pre allocated to a part of the touch sensing period TS is output through the data output section 126. [

The control signal generator 128 generates a memory control signal MCS for controlling the driving timing of the line buffer unit 130 and outputs the generated memory control signal MCS to the line buffer unit 130. The memory control signal MCS includes information on the output start line and information on the output line number.

The line buffer unit 130 responds to the memory control signal MCS and supplies the image data DATA of at least one horizontal line including the last horizontal line of each display block among the image data DATA supplied from the image processing unit 124. [ Stored in the line buffer unit 130 in response to the memory control signal MCS before the image data DATA of the next display block is output from the image processing unit 124 after temporarily storing the pre- And outputs the data (Pre) to the data output unit (126).

For example, when each display block includes i horizontal lines (where i is a natural number of 2 or more), the image processing unit 124 outputs image data to be supplied to the display active period TD of each display block When the memory control signal MCS is supplied to the line buffer unit 130, the line buffer unit 130 outputs the horizontal control signal MCS to the horizontal line corresponding to the output start line of the memory control signal MCS as shown in FIGS. 5A and 5B. (I-th horizontal line) from an output line number (for example, an (i-2) th horizontal line) to an output line number (for example, 3) The line buffer unit 130 then outputs the image data of the plurality of horizontal lines stored in the line buffer unit 130 before the image data of the next display block is supplied from the image processing unit 124 in response to the memory control signal MCS. And supplies the data to the data output unit 126 as pre-data (Pre).

The line buffer unit 130 is formed of a static random access memory (SRAM) or a synchronous dynamic random access memory (SDRAM).

The data output section 126 outputs the video data DATA of the display block supplied from the video processing section 124 to the data driving section 108 in response to the first logical section HL1 of the output data enable signal DEo And supplies the data driver 108 with the free data Pre supplied from the line buffer unit 130 in response to the second logic section HL2 of the output data enable signal DEo. The data output unit 126 supplies the data driver 108 with the image data DATA, the pre-data Pre and the data control signal DCS to the data driver 108 using any one of various interface schemes. Further, the data output section 126 supplies the gate control signal GCS to the gate driving section 106.

In response to the data control signal DCS from the timing controller 120, the data driver 108 supplies each of the digital video data DATA and the free data Pre using the gamma voltage to the analog video data voltage (Vdata) and the free data voltage (Vpre). The data driver 108 supplies the converted analog video data voltage Vdata to the data lines DL1 to DLm during the display active period TD. The data driver 108 may also be configured to receive the converted analog form of pre-data during the pre-data period allocated during some periods of the touch sensing period TS or between the touch sensing period TS and the next display active period TD, And supplies the data voltage Vpre to the data lines DL1 to DLm.

As described above, the touch-type display device according to the present invention is characterized in that the pre-data voltage Vpre, which is a video data voltage supplied to at least one horizontal line including the last horizontal line of the k-th display block, (TSk) or during a pre-data period allocated between the k-th touch sensing period (TSk) and the display active period (TDk + 1) of the (k + DLm. Accordingly, the pixel positioned on the first horizontal line of the (k + 1) th display block is shifted from the same data voltage Vpre as the data voltage Vdata supplied to the pixel located on the last horizontal line of the kth display block The charging is started. Therefore, it is possible to prevent a pixel positioned on the first horizontal line of the (k + 1) -th display block from being strongly charged or charged, so that the first horizontal line of the k-th display block and the first horizontal It is possible to prevent the occurrence of a line dim phenomenon due to the difference in luminance between the lines.

6 is a waveform diagram for explaining a driving method of a touch display device according to an embodiment of the present invention.

6, one frame period is divided into a plurality of display active periods TD1, TD2, ..., TDN and a plurality of touch sensing periods TS1, TS2, ..., TSN Time-sharing. Since the display active periods TD1, TD2, ..., TDN and the touch sensing periods TS1, TS2, ..., TSN are alternately arranged, the touch sensing periods TS1, TS2, Each being allocated subsequent to each of the display active periods TD1, TD2, ..., TDN.

In each of the display active periods TD1, TD2, ..., TDN, the gate driver 106 sequentially supplies the gate pulse of the gate high voltage to the gate lines GL of the display block, Supplies the image data voltage Vdata to the data lines DL1 to DLm so that the pixels of the display block charge the supplied image data voltage Vdata. At this time, the common voltage Vcom from the common voltage supply unit (not shown) is supplied to the common electrode Tx electrode. In each of the touch sensing periods TS1, TS2, ..., TSN, the touch driving circuit 110 supplies a Tx driving signal to the Tx line TL of the block and senses the touch sensors through the Rx line RL And the gate driver 106 supplies a gate low voltage VGL to the gate lines GL. The data driver 108 supplies the pre-data voltage Vpre to the data lines DL1 to DLm in the pre-data period PR allocated to some of the touch sensing periods TS. On the other hand, in the pre-data voltage Vpre supplied to the data lines DL1 to DLm in the pre-data period PR, since the thin film transistor TFT is turned off by the gate low voltage VGL, However, the data lines DL1 to DLm are charged to enable the pixels of the display block to stably charge the image data in the next display active period.

Specifically, in the first display active period TD1, the gate driver 106 sequentially supplies gate pulses of the gate high voltage VGH to the gate lines GL11 to GL1i of the first display block, 108 supplies a video data voltage Vdata to the data lines DL1 to DLm in response to the first source output enable signal SOE1 so that the pixels of the first display block receive the supplied video data voltages Vdata, . At this time, the common voltage Vcom is supplied to the common electrode Tx electrode. In the first touch sensing period TS1, the touch driving circuit 110 supplies the Tx driving signal to the Tx line TL of the corresponding block and outputs the touch sensors Cm of the corresponding block to the Rx line RL Sensing. In the free data period PR1 allocated to some of the first touch sensing period TS1 and adjacent to the display active period TD2 of the next second display block, the data driver 108 supplies the second source output enable signal SOE2 And supplies the pre-data voltage Vpre to the data lines DL1 to DLm in response to the pre-data voltage Vpre. Here, the free data voltage Vpre is the video data voltages supplied to at least one horizontal line including the last horizontal line of the first display block. The last free data voltage Vpre supplied to the data lines DL1 to DLm in the first free data period PR1 is the video data supplied to the last horizontal line of the first display block in the first display active period TD1 Is the same as the data voltage (Vdata).

Next, in the second display active period TD2, the gate driver 106 sequentially supplies gate pulses to the gate lines GL21 to GL2i of the second display block, and the data driver 108 supplies the gate pulses to the data lines DL1 To DLm) to the pixels of the second display block. At this time, the common voltage Vcom is supplied to the common electrode Tx electrode. Then, in the second touch sensing period TS2, the touch driving circuit 110 drives and senses touch sensors of the corresponding block. In the second free data period PR2 (not shown) adjacent to the display active period TD3 of the next third display block in the second touch sensing period TS2 (not shown), the data driver 108 supplies the second source And supplies the pre-data voltage Vpre to the data lines DL1 to DLm in response to the output enable signal SOE2. Here, the free data voltage Vpre is the video data voltages supplied to at least one horizontal line including the last horizontal line of the second display block. The last free data voltage Vpre supplied to the data line DL in the second free data period PR2 is equal to the video data voltage Vs supplied to the last horizontal line of the second display block in the second display active period TD2, (Vdata).

The gate driver 106 sequentially supplies gate pulses to the gate lines GLN1 to GLNi of the Nth display block in the Nth display active period TDN, (Vdata) to the pixels of the Nth display block through the data lines DL1 to DLm. At this time, the common voltage Vcom is supplied to the common electrode Tx electrode. Then, in the Nth touch sensing period TSN, the touch driving circuit 110 drives and senses touch sensors of the corresponding block. During the N-th touch sensing period TSN, in the N-th free data period PRN adjacent to the display active period TD1 of the first display block of the next frame, the data driver 108 generates the second source output enable signal And supplies the pre-data voltage Vpre to the data lines DL1 to DLm in response to the data signal SOE2. Here, the free data voltage Vpre is the pixel data voltages supplied to at least one horizontal line including the last horizontal line of the Nth display block. The last free data voltage Vpre supplied to the data lines DL1 to DLm in the Nth free data period PRN is supplied to the last horizontal line of the Nth display block in the Nth display active period TDN Is the same as the video data voltage (Vdata).

6 illustrates a case where the pre-data period PR to which the pre-data voltage Vpre is supplied is included as a part of the touch sensing period TS to which the Tx driving signal is supplied. However, The free data period PR can be inserted between the touch sensing period TS and the next display active period TD and the common voltage Vcom Is supplied. In this case, since the touch sensing period (TS) to which the Tx driving signal is supplied is relatively short, the display delay of the next display block due to the period during which the Tx driving signal is supplied is minimized to prevent the display split phenomenon have.

FIG. 8 is a diagram illustrating a touch display apparatus according to an embodiment of the present invention, and FIG. 9 is a diagram illustrating a method of driving a touch display apparatus according to an embodiment of the present invention.

The touch display device shown in Fig. 8 includes a touch-sensitive display panel 202, a display drive circuit including a gate driver 206, a data driver 208 and a timing controller 220, .

The touch display device according to the embodiment of the present invention senses whether or not it is touched by a capacitance method. The capacitance touch method is classified into the mutual capacitance method described with reference to FIG. 3 and the self capacitance touch method described below, and the touch display device according to the embodiment can use one of mutual capacitance and self capacitance method . Hereinafter, the self-capacitance touch method will be described as an example.

The display panel 202 includes a pixel matrix composed of pixels driven independently including a thin film transistor connected to the gate line GL and the data line DL. The display panel 202 includes a plurality of touch electrode columns included in the pixel matrix. Each of the plurality of touch electrode columns includes a plurality of touch electrodes TE arranged in the longitudinal direction of the data lines, And a plurality of signal lines (TL) connected to the touch driving circuit (200) and individually connected to the touch panel (TE). The plurality of touch electrodes TE are formed by dividing the common electrode formed in the pixel matrix, and each touch electrode TE may be formed to have a predetermined size including a plurality of pixels in consideration of the touch point size.

The display panel 202 has both a touch sensing function and a display function, and is driven by time division into a plurality of display active periods (TD) and a plurality of touch sensing periods (TS) as shown in FIG. The plurality of display blocks (FIG. 2) dividing the pixel matrix are driven in the display mode divided into a plurality of display active periods (TD), and in the touch sensing period (TS) allocated between the plurality of display active periods And is driven in the touch sensing mode. In particular, a pre-data period PR in which the over-driving voltage Vover is supplied to the data lines DL is inserted between each touch sensing period TS and the next display active time period TD.

In each display active period TD, the gate driver 206 sequentially supplies and drives scan pulses SP to the gate lines GL of the display block, and the data driver 208 drives the data lines DL The common voltage supply unit supplies a common voltage Vcom to the touch electrodes TE through the signal lines TL. The common voltage supply unit supplies the common voltage Vcom to the pixels of the display block through the signal lines TL.

In each touch sensing period TS, the touch driving circuit 200 supplies the touch driving signals Vtouch to the touch electrodes TE of the corresponding display block through the signal lines TL, ) Through the signal lines (TL) and senses whether or not it is touched.

In particular, in each touch sensing period TS, the touch driving circuit 200 supplies the touch driving signal Vtouch to the gate driving unit 206 and the data driving unit 208, and the gate driving unit 206 supplies the touch driving signal Vtouch To the gate lines GL and the data driver 208 supplies the touch driving signal Vtouch to the data lines DL. Thus, in the touch sensing period TS, the touch electrode TE, the signal line TL, the gate line GL and the data line DL are subjected to the load-free driving (that is, The parasitic capacitance between the touch electrode TE and the gate line GL and the parasitic capacitance between the touch electrode TE and the data line DL through the signal line TL and the gate line GL, It is possible to prevent the parasitic capacitance between the data lines DL from being formed. Therefore, since the display panel 202 can reduce the RC load of the touch electrode TE and the signal line TL by performing the above-described load-free driving in the touch sensing period TS, the touch sensing sensitivity Can be improved.

The touch driving circuit 200 differentially amplifies the touch driving signal supplied to the touch electrode TE through the signal line TL and the feedback signal from the touch electrode TEi in the touch sensing period TS, (Signal delay amount) of each of the touch electrodes due to the sensing of the touch electrode and outputs the sensing information to the host system 104 (FIG. 2). The touch driving circuit 200 may be integrated into a touch IC or may be integrated with the data driving unit 208 as a driving IC or may be integrated with a driving IC together with the data driving unit 208 and the timing control unit 220.

The data driver 208 drives the overdriving voltage Vover in the pre-data period PR inserted before each display active period TD, that is, between each touch sensing period TS and the next display active period TD To the data lines DL. Accordingly, since the data lines DL are accelerated to reach the stabilization state required for the pixel charging, the stabilization of the data lines DL before the display active period TD after the touch sensing period TS It is possible to shorten the free data period (PR) required for data transmission. Therefore, the touch sensing period (TS) can be further secured as the free data period (PR) is shortened, so that deterioration of the touch sensing performance due to insertion of the free data period (PR) can be prevented. The gate driver 206 supplies the gate line voltage VGL to the gate lines GL and the common voltage Vcom from the common voltage supplier (not shown) is applied to the touch electrodes TE in the free data period PR. Is supplied.

The timing controller 220 controls the driving timings of the gate driver 206 and the data driver 208. The timing controller 220 supplies the data driver 208 with the image data to be supplied to the corresponding display block of the display panel 202 in each display active period TD. The timing controller 220 also controls overdriving to be supplied to the data lines DL of the display panel 202 in the pre-data period PR between each touch sensing period TS and the next display active period TD, And supplies the data (Over) to the data driver 208. That is, the timing controller 220 supplies overdriving data (Over) to the data driver 208 before supplying the video data of the next display block to the data driver 208.

Over driving data Over is a high gradation (normally black mode LCD) or low gradation data (normally white mode LCD) capable of providing a data voltage having a relatively large amplitude based on the common voltage Vcom Or may be determined as grayscale data capable of analyzing image data to be displayed on at least one horizontal line of the next display block and providing a data voltage having a larger amplitude than the image data.

10 is a block diagram mainly showing a data path of the internal structure of the timing controller 220 according to an embodiment of the present invention.

The timing controller 220 shown in FIG. 10 includes an image processor 224, a free data generator 230 and a data output unit 226. The timing controller 220 includes a data input unit 122 and a control signal generator (128).

The image processing unit 224 processes the image data supplied from the data input unit 122 (FIG. 4) through necessary image processing and outputs the image data (DATA) to be supplied to the display block in each display active period (TD) And outputs the data to the data driver 208 via the interface of the data driver 226. On the other hand, the image processor 224 can output the image data (DATA) to be supplied to at least one horizontal line of the next display block to the pre-data generator 230.

The free data generator 230 generates data data Dummy supplied from an external memory (not shown) or video data Dummy supplied from the video processor 224 in response to the control of the control signal generator 128 DATA) to generate overdriving data (Over). In response to the control of the control signal generator 128 (FIG. 4), the free data generator 230 generates overdriving data (FIG. 4) before the video data DATA of the next display block is supplied from the video processor 224 Over to the data driver 208 via the data output unit 116. [ Accordingly, the data driver 208 may convert overdriving data (Over) supplied from the timing controller 220 into an overdriving voltage Vover in the pre-data period PR and output the data to the data lines DL have.

The free data generating unit 230 generates a high gray level (LCD in a normally black mode) capable of providing a data voltage having a relatively large amplitude based on the common voltage Vcom, using predetermined external data information (Dummy) (E.g., 255 gradation data) or low gradation data (normally white mode LCD, for example, 0 gradation data) to overdrive data Over and output the data to the data output unit 26. [

Alternatively, the free data generating unit 230 may analyze the video data supplied from the video processing unit 224 to be displayed on at least the first horizontal line of the next display block, and may provide a data voltage having a larger amplitude than the video data Over-driving data (Over), or may select it from the look-up table and output it to the data output unit 226. [

11 is a simulation waveform diagram showing the driving result of the touch-type display device according to the above-described embodiment of the present invention.

Referring to FIG. 11A, the touch display apparatus according to an embodiment of the present invention calculates the data voltages (Vdata +, Vdata-) of the previous display block in the pre-data period PR before the display active period (TD) It is found that each pixel charges the stabilized pixel voltage absolute value (| Vpx |) in the display active period (TD) following the pre-data period (PR) by stabilizing the data line (DL) . Accordingly, it is possible to prevent the line dim phenomenon due to the difference in luminance between the display blocks driven with the touch sensing period (TS) in between.

Referring to FIG. 11B, the touch display apparatus according to the embodiment of the present invention supplies at least one over-driving voltage Vover in the free data period PR, It can be seen that the data period PR 'is shortened and the pixel voltage absolute value (| Vpx |) stabilized in the display active period TD following the pre-data period PR' is filled. Accordingly, since the free data period PR 'is shortened while preventing the line dim phenomenon due to the difference in brightness between the same data and the display blocks driven in the touch sensing period TS, the touch sensing period is shortened by the shortened time And the touch sensing performance can be improved.

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

100: display drive circuit 110, 210: touch drive circuit
120, 220: a timing control section 102, 202: a display panel
104: host system 106, 206: gate driver
108, 208: Data driver 112: Rx drive circuit
114: Tx driving circuit 116: Touch control unit
122: data input unit 124, 224:
126: Data output unit 128: Control signal generation unit
130: Line buffer unit 230:

Claims (12)

A display panel on which a plurality of pixels and touch electrodes are disposed;
Dividing the display panel into N display blocks (where N is a natural number equal to or greater than 2), dividing the N display blocks into N display active periods, and applying the video data voltage to the display panel in each display active period A display drive circuit for supplying the display drive circuit;
And a touch driving circuit for driving and sensing touch electrodes of the display panel in each of the touch sensing periods allocated between the display active periods,
Wherein the display drive circuit supplies the pre-data voltage to the data lines of the display panel in a pre-data period inserted between each touch sensing period and the next display active period. The method according to claim 1,
Wherein the pre-data voltage is a video data voltage supplied to at least one horizontal line including a last horizontal line of the display block in a display active period before each touch sensing period. The method according to claim 1,
Wherein the pre-data voltage is a pre-set overdriving voltage or an overdriving voltage whose amplitude is larger than a video data voltage to be supplied to the display block in a display active period following each touch sensing period. The method according to claim 1,
The display drive circuit
A data driver for supplying a video data voltage corresponding to each pixel of the display block through the data lines in each display active period and supplying the data lines with the pre-data voltage for each of the pre-data periods;
A gate driver for supplying a scan pulse to gate lines of the display block in each display active period;
A common voltage supply unit for supplying a common voltage to the touch electrodes in each of the pre-data period and the display active period;
And a timing controller for controlling the data driver and the gate driver. The method of claim 4,
Wherein the touch driving circuit supplies the touch driving signal to the touch electrodes and the touch driving signal to the gate driving unit and the data driving unit for each touch sensing period, And the data driver supplies the touch driving signal to the data lines. The method of claim 4,
The timing controller supplies the video data of the k-th (k is 1? K <N) th display block to the data driver, and supplies the video data of the (k + 1) th display block to the data driver. To the data driver,
Wherein the data driver converts the image data of the kth display block into a corresponding image data voltage and supplies the image data voltage to each pixel of the kth display block in a kth display active period, Th display active period and the (k + 1) &lt; th &gt; display active period, and supplies the pre-data to the data lines. The method of claim 6,
The pre-data output from the timing controller to the data driver before the video data of the (k + 1) -th display block is output to the data driver may be the last horizontal Wherein the image data of at least one horizontal line including the line is the same as the image data of at least one horizontal line including the line. The method of claim 6,
The pre-data output to the data driver before the video data of the (k + 1) -th display block is output to the data driver in the timing controller is pre-set overdriving data or at least Wherein the overdriving data is determined to provide a voltage having a larger amplitude than the image data in consideration of the image data of the first horizontal line. A display panel in which a plurality of pixels and touch electrodes are disposed is divided into N display blocks (N is a natural number of 2 or more), and the N display blocks are time-divided into N display active periods, The method comprising: a first step of supplying a video data voltage to the display panel;
A second step of driving and sensing the touch electrodes in each of the N sensing periods subsequent to the N display periods;
And a third step of supplying a pre-data voltage to data lines of the display panel in a pre-data period inserted between each touch sensing period and a next display active period. The method of claim 9,
Wherein the pre-data voltage is a video data voltage supplied to at least one horizontal line including a last horizontal line of the display block in a display active period before each touch sensing period . The method of claim 9,
Wherein the pre-data voltage is a predetermined overdriving voltage or an overdriving voltage whose amplitude is larger than a video data voltage to be supplied to the display block in a display active period following each touch sensing period. The method of claim 9,
A common voltage is supplied to the touch electrodes in the pre-data period and the display active period,
Wherein the touch driving signal is supplied to the touch electrodes during the touch sensing period and the touch driving signal is also supplied to gate lines and data lines of the display panel.

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