KR20180074956A - Panel driving apparatus panel driving method - Google Patents

Abstract

The present invention can display different gradations on pixels displayed on a panel by supplying common voltage of different voltage levels to a plurality of common voltage electrodes. In a driving condition of a common voltage electrode, when a short-circuit failure occurs in the common voltage electrode, an unintended gradation is displayed on the common voltage electrode. A user can visually confirm the gradation and confirms the short-circuit failure of the common voltage electrode. A panel driving device in which a plurality of pixels are located and the plurality of common voltage electrodes corresponding to the plurality of pixels are located comprises a common voltage electrode driving circuit and a data driving circuit.

Description

[0001] PANEL DRIVING APPARATUS PANEL DRIVING METHOD [0002]

The present invention relates to a technique for driving a panel.

A plurality of pixels are defined on the panel, and various electrodes such as a gate line, a data line, and the like for driving the pixels can be arranged.

On the other hand, in order to realize high resolution, the distance between the electrodes disposed on the panel is getting shorter. However, as the distance between the electrodes becomes shorter, the probability of occurrence of short failure between the electrodes increases.

If a short circuit failure occurs between the electrodes, various problems may occur in the panel.

When an electrode is an electrode used for driving a pixel such as a gate line or a data line, a short-circuit failure between the electrodes may cause a problem of image quality deterioration. For example, when two adjacent gate lines are short-circuited, an undesired pixel may be driven to cause a lighting failure. As another example, when two adjacent data lines are short-circuited, there may occur a problem that the pixels are driven with undesired brightness in accordance with the drop or rise of the data voltage.

In the case where the electrode is a common voltage electrode and the common voltage electrode is commonly used as a touch electrode, a short circuit failure between the electrodes may cause a problem of lowering the touch sensitivity or cause a problem that the touch is not sensed at the corresponding electrode.

In order to prevent or solve such a problem, development of a technique for detecting short-circuit failure between electrodes is required.

In view of the foregoing, an object of the present invention is, in one aspect, to provide a technique for detecting short-circuit failure of electrodes disposed on a panel.

In order to achieve the above object, in one aspect, the present invention provides an apparatus for driving a panel in which a plurality of pixels are arranged and a plurality of common voltage electrodes corresponding to the plurality of pixels are arranged, Supplying a common voltage (first common voltage) of a first voltage level to the first common voltage electrode group and a second common voltage electrode group located adjacent to the first common voltage electrode group, A common voltage electrode driving circuit for supplying a voltage (a second common voltage); And a data driving circuit for supplying a data voltage corresponding to the first gradation or a data voltage having a third voltage level to the pixels corresponding to the first common voltage electrode group and the second common voltage electrode group,

And a panel driving device.

According to another aspect of the present invention, there is provided a method of driving a panel in which a plurality of pixels are arranged and a plurality of common voltage electrodes corresponding to the plurality of pixels are disposed, Sensing a touch or proximity of an external object to the panel using a response signal to the touch driving signal; Supplying a common voltage for display driving to the plurality of common voltage electrodes in a display driving period and supplying a data voltage corresponding to the video data to the plurality of pixels; (First common voltage) of the first voltage level to the first common voltage electrode group in the visual inspection period and supplies the common voltage (first common voltage) of the first common voltage electrode group to the second common voltage electrode group adjacent to the first common voltage electrode group And supplying a common voltage (second common voltage) of a second voltage level different from the voltage level.

As described above, according to the present invention, it is possible to detect a short circuit failure of the electrodes disposed on the panel.

1 is a configuration diagram of a display device according to an embodiment.
2 is an internal configuration diagram of a pixel according to an embodiment.
3 is a view showing that the common voltage electrode driving circuit according to the embodiment supplies common voltages of different voltage levels.
4 is a view showing a first example of the arrangement of the first common voltage electrode group and the second common voltage electrode group.
5 is a view showing a second example of the arrangement of the first common voltage electrode group and the second common voltage electrode group.
FIG. 6 is a graph showing the factors determining the gradation of pixels corresponding to each common voltage electrode in a steady state. FIG.
Fig. 7 is a diagram for explaining the gradation displayed by each pixel when a short-circuit failure occurs in some common voltage electrodes. Fig.
8 is a diagram showing gradations displayed on the panel when a short-circuit failure occurs in some common voltage electrodes.
9 is a first exemplary waveform diagram of a common voltage and a data voltage according to time periods.
10 is a second exemplary waveform diagram of the common voltage and the data voltage according to the time interval.
11 is a view showing that the common voltage electrode driving circuit senses touch or proximity of an external object to a panel.
12 is a flowchart of a panel driving method according to another embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

1 is a configuration diagram of a display device according to an embodiment.

Referring to FIG. 1, a display device 100 includes a panel 110, a data driving circuit 120, a gate driving circuit 130, a common voltage electrode driving circuit 140, and the like.

Each of the data driving circuit 120, the gate driving circuit 130, and the common voltage electrode driving circuit 140 may drive at least one configuration included in the panel 110.

The data driving circuit 120 drives the data line DL connected to the pixel P and the gate driving circuit 130 drives the gate line GL connected to the pixel P. The common voltage electrode driving circuit 140 may drive a common voltage electrode (CE) disposed on the panel 110.

The devices 120, 130, 140 driving at least one configuration included in the panel 110 may be referred to as a panel driving device.

Each of the panel drive devices may constitute one integrated circuit. For example, the data driving circuit 120 may constitute a data driver integrated circuit, and the gate driving circuit 130 may constitute a gate driver integrated circuit.

The panel drive apparatus may constitute one integrated circuit by two or more circuits. For example, the data driving circuit 120 and the common voltage electrode driving circuit 140 may constitute one integrated display driving integrated circuit.

In addition to the data driving circuit 120, the gate driving circuit 130, and the common voltage electrode driving circuit 140 described above, the panel driving apparatus may include a touch driving circuit, a timing controller, a power management circuit, and the like.

Although the names are different, the two panel drive devices may be constituted by one piece of hardware. For example, the common voltage electrode driving circuit 140 and the touch driving circuit may be configured with the same hardware.

Each of the circuits 120, 130, and 140 described above may be referred to as a panel driving device, or may be referred to as a panel driving device as a whole.

On the other hand, the data driving circuit 120 supplies the data voltage to the data line DL in order to display the digital image on each pixel P of the panel 110. The data driving circuit 120 receives image data from a timing controller or the like, converts the image data into a data voltage, and supplies the data voltage to the data line DL. In addition, the data driving circuit 120 can supply a constant data voltage to the data lines DL without receiving image data. Particularly, the data driving circuit 120 supplies a predetermined data voltage set in advance for the purpose of testing a configuration included in the panel 110, for example, a pixel (P), a common voltage electrode (CE) Line DL.

The data driver circuit 120 may include at least one data driver integrated circuit which may be a tape automated bonding (TAB) or a chip on glass (COG) On glass may be connected to the bonding pad of the panel 110 or may be directly formed on the panel 110 or integrated on the panel 110 as the case may be. In addition, the data driving circuit 120 may be implemented by a chip on film (COF) method.

The gate driving circuit 130 sequentially supplies a scan signal to the gate line GL to turn on or off the transistor located in each pixel P.

1, the gate drive circuit 130 may be located on one side of the panel 110, or on both sides of the panel 110, divided into two, as shown in FIG.

In addition, the gate drive circuit 130 may include at least one gate driver integrated circuit, which may be a tape automated bonding (TAB) or a chip on glass (COG) May be directly connected to the bonding pads of the panel 110 or may be implemented in a GIP (Gate In Panel) type, and may be formed directly on the panel 110, or may be integrated on the panel 110, as the case may be. Also, the gate driving circuit 130 may be implemented by a chip on film (COF) method.

The panel 110 may include only a display panel, and may further include a touch panel (TSP). Here, the display panel and the touch panel can share some components with each other. For example, the touch electrode for sensing a touch on the touch panel may be a common voltage electrode CE to which a common voltage is supplied from the display panel. In view of the fact that the display panel and some components of the touch panel are shared with each other, this panel 110 may be referred to as an integral panel, but the present invention is not limited thereto. Although an in-cell type panel is known in which the display panel and some components of the touch panel are shared with each other, the panel to which the present invention is applied is only one example of the panel 110 described above. (In-Cell) type panel.

On the other hand, a plurality of common voltage electrodes CE are arranged in the panel 110, and the common voltage electrode driving circuit 140 supplies a common voltage to the common voltage electrode CE to control the gradation of the pixel P .

2 is an internal configuration diagram of a pixel according to an embodiment.

Referring to FIG. 2, the pixel P may include a transistor TFT, a pixel electrode PE, a liquid crystal (LC), and a common voltage electrode CE.

The gate terminal of the transistor TFT may be connected to the gate line GL, the drain terminal may be connected to the data line DL and the source terminal may be connected to the pixel electrode PE in the liquid crystal LC direction.

When the scan signal SCAN corresponding to the turn-on voltage is supplied to the gate terminal through the gate line GL, the drain terminal and the source terminal of the transistor TFT are electrically connected to each other through the pixel electrode PE in the liquid crystal LC direction The data voltage VDATA can be supplied.

A common voltage VCOM may be supplied to the common voltage electrode CE. The liquid crystal voltage VLC is formed in the liquid crystal LC by the voltage difference between the common voltage VCOM and the data voltage VDATA. Then, the liquid crystal LC is shut off by the electric field generated by the liquid crystal voltage VLC, so that the gradation of the pixel P can be controlled. The higher the liquid crystal voltage VLC, the closer the gradation of the pixel P to the white gradation, and the lower the liquid crystal voltage VLC the lower the gradation of the pixel P becomes to the white gradation Can be close. In the following, the description will be focused on the embodiment in which the gradation of the pixel P is closer to the white gradation as the liquid crystal voltage VLC is higher, but the present invention is not limited thereto.

The liquid crystal voltage VLC can be determined by the voltage difference between the common voltage VCOM and the data voltage VDATA. The general method is to supply the common and fixed voltage VCOM for all the pixels P, (VDATA) to control the gradation of each pixel (P).

The display device according to one embodiment can also control the gradation of the pixel P according to this general method. However, the display device according to the embodiment can supply the common voltage VCOM having different voltage levels to the plurality of common voltage electrodes CE, in order to detect a short-circuit failure of the common voltage electrode CE.

3 is a view showing that the common voltage electrode driving circuit according to the embodiment supplies common voltages of different voltage levels.

3, the common voltage electrode driving circuit 140 supplies a common voltage (first common voltage) VCOM1 of a first voltage level to the first common voltage electrode group CEG1, (Second common voltage VCOM2) of the second voltage level to the second common voltage CEG2.

At this time, a data voltage corresponding to a specific gradation or a data voltage having a specific voltage level can be supplied to the pixels corresponding to the first common voltage electrode group CEG1 and the second common voltage electrode group CEG2.

Since the common voltages VCOM1 and VCOM2 having different voltage levels are supplied to the same data voltage, the pixels at the positions corresponding to the first common voltage electrode group CEG1 and the second common voltage electrode group CEG2 The pixels at the corresponding positions may represent different gradations - different brightnesses. For example, pixels at positions corresponding to the first common voltage electrode group (CEG1) represent black gradations, and pixels at positions corresponding to the second common voltage electrode group (CEG2) may represent white gradation.

The first common voltage electrode group CEG1 and the second common voltage electrode group CEG2 may be adjacent to each other within the panel 110. [

4 is a view showing a first example of the arrangement of the first common voltage electrode group and the second common voltage electrode group.

Referring to FIG. 4, the common voltage electrode belonging to the first common voltage electrode group CEG1 and the common voltage electrode belonging to the second common voltage electrode group CEG2 can be arranged in a matrix in rows and columns . The common voltage electrode belonging to the first common voltage electrode group (CEG1) and the common voltage electrode belonging to the second common voltage electrode group (CEG2) can be arranged so as to cross each other in each row and each column. According to this arrangement, the second common voltage electrode group CEG2 may be disposed adjacent to the upper, lower, right, and left sides of the common voltage electrode belonging to the first common voltage electrode group CEG1. The first common voltage electrode group CEG1 may be arranged adjacent to the common voltage electrode belonging to the second common voltage electrode group CEG2.

5 is a view showing a second example of the arrangement of the first common voltage electrode group and the second common voltage electrode group.

5, the common voltage electrode belonging to the first common voltage electrode group CEG1 and the common voltage electrode belonging to the second common voltage electrode group CEG2 may be arranged in a matrix in rows and columns . The common voltage electrode belonging to the first common voltage electrode group (CEG1) and the common voltage electrode belonging to the second common voltage electrode group (CEG2) can be arranged so as to cross each other in each row. In each column, common voltage electrodes of the same group can be arranged. According to this arrangement, the second common voltage electrode group CEG2 can be disposed adjacent to the right and left of the common voltage electrode belonging to the first common voltage electrode group CEG1. The first common voltage electrode group CEG1 may be disposed adjacent to the right and left of the common voltage electrode belonging to the second common voltage electrode group CEG2.

Although not shown in the figure, the common voltage electrode belonging to the first common voltage electrode group CEG1 and the common voltage electrode belonging to the second common voltage electrode group CEG2 may be arranged so as to cross each other in each column. In each row, common voltage electrodes of the same group can be arranged. According to this arrangement, the second common voltage electrode group (CEG2) can be arranged adjacent to the upper and lower sides of the common voltage electrode belonging to the first common voltage electrode group (CEG1). The first common voltage electrode group CEG1 may be disposed adjacent to the upper and lower sides of the common voltage electrode belonging to the second common voltage electrode group CEG2.

The group to which the common voltage electrode belongs is not fixed but can be varied. For example, in the first time period, the common voltage electrode belonging to the first common voltage electrode group (CEG1) and the common voltage electrode belonging to the second common voltage electrode group (CEG2) are arranged so as to cross each other in each row , The common voltage electrode belonging to the first common voltage electrode group (CEG1) and the common voltage electrode belonging to the second common voltage electrode group (CEG2) can be arranged so as to cross each other in each column in the second time period.

FIG. 6 is a graph showing the factors determining the gradation of pixels corresponding to each common voltage electrode in a steady state. FIG.

6, the first common voltage electrode CE1 and the third common voltage electrode CE3 belong to the first common voltage electrode group and the second common voltage electrode CE2 and the fourth common voltage electrode CE4 belong to the first common voltage electrode group 2 common voltage electrode group. Thus, the first common voltage CE1 and the third common voltage CE3 are supplied with the first common voltage VCOM1 and the second common voltage CE2 and the fourth common voltage CE4 The second common voltage VCOM2 may be supplied.

When the common voltage electrodes CE1 to CE4 are in a normal state, they are insulated from other common voltage electrodes, so that the supplied voltage can be directly formed in each common voltage electrode. For example, the voltage VCE1 formed on the first common voltage electrode CE1 and the voltage VCE3 formed on the third common voltage electrode CE3 may be equal to the first common voltage VCOM1. The voltage VCE2 formed on the second common voltage electrode CE2 and the voltage VCE4 formed on the fourth common voltage electrode CE4 may be equal to the second common voltage VCOM1.

The same data voltage VDATA may be supplied to the pixel electrodes PE1 to PE4 corresponding to the common voltage electrodes CE1 to CE4.

Since the same data voltage VDATA is supplied to each of the pixel electrodes PE1 to PE4, the liquid crystal voltages VLC1 to VLC4 of the respective pixels are supplied to the common voltage electrodes CE1 to CE4 through the voltages VCE1 to VCE4 ). ≪ / RTI > The gradation of each pixel can be determined by each of the liquid crystal voltages VLC1 to VLC4.

6, when the voltage level of the first common voltage VCOM1 is higher than the voltage level of the second common voltage VCOM2, the first liquid crystal voltage VLC1 and the third liquid crystal voltage VLC3 are formed to be low And the second liquid crystal voltage VLC2 and the fourth liquid crystal voltage VLC4 may be formed to be high. Thus, the pixels at the positions corresponding to the first common voltage electrode CE1 and the third common voltage electrode CE3 are substantially in black gradation, and the second common voltage electrode CE2 and the fourth common voltage electrode CE4 ) Can exhibit a substantially white gradation.

When the common voltage is equal, there may be a certain difference (maximum gradation data voltage difference) between the data voltage representing the white gradation and the data voltage representing the black gradation. The common voltage electrode driving circuit according to an exemplary embodiment may display a black gradation and a white gradation by supplying a common voltage having a different voltage level to the same data voltage. The difference may be the same. Or the voltage level difference of the common voltage may be larger than the maximum gradation data voltage difference. For example, the difference between the first common voltage VCOM1 and the second common voltage VCOM2 may be equal to or greater than the maximum gradation data voltage difference.

Fig. 7 is a diagram for explaining the gradation displayed by each pixel when a short-circuit failure occurs in some common voltage electrodes. Fig.

7, the first common voltage electrode CE1 and the third common voltage electrode CE3 belong to the first common voltage electrode group, and the second common voltage electrode CE2 and the fourth common voltage electrode CE4 belong to the first common voltage electrode group 2 common voltage electrode group. Thus, the first common voltage CE1 and the third common voltage CE3 are supplied with the first common voltage VCOM1 and the second common voltage CE2 and the fourth common voltage CE4 The second common voltage VCOM2 may be supplied.

Since the first common voltage electrode CE1 and the second common voltage electrode CE2 are in a normal state and are insulated from the other common voltage electrodes, the supplied voltage can be directly formed in each common voltage electrode. For example, the voltage VCE1 formed on the first common voltage electrode CE1 may be equal to the first common voltage VCOM1. The voltage VCE2 formed on the second common voltage electrode CE2 may be equal to the second common voltage VCOM1.

On the other hand, the third common voltage electrode CE3 and the fourth common voltage electrode CE4 are short-circuited to each other, and the supplied voltage may not be formed directly on each common voltage electrode. For example, the voltage VCE3 formed on the third common voltage electrode CE3 may be lower than the first common voltage VCOM1. The voltage VCE4 formed on the fourth common voltage electrode CE4 may be higher than the second common voltage VCOM2. Since the third common voltage electrode CE3 and the fourth common voltage electrode CE4 are short-circuited, the voltages VCE3 and VCE4 formed on the respective electrodes can be changed to be equal to each other. When the degree of the short circuit is large, the same voltage is formed on the third common voltage electrode CE3 and the fourth common voltage electrode CE4, and the value thereof is the first common voltage VCOM1 and the second common voltage VCOM2, Lt; / RTI >

On the other hand, the voltage VCE3 formed on the third common voltage electrode CE3 is different from the first common voltage VCOM1, and the pixels located at the positions corresponding to the third common voltage electrode CE3 have the intended gradation- For example, black gradation - may not be displayed, and other gradations-for example, gray gradation-may be displayed. In addition, the voltage VCE4 formed on the fourth common voltage electrode CE4 is different from the second common voltage VCOM2, and the pixels located at the positions corresponding to the fourth common voltage electrode CE4 have the gradation- For example, white gradation - may not be displayed, and other gradations-for example, gray gradation-may be displayed.

The user can confirm the portion not indicated by the intended gradation (e.g., black gradation or white gradation) in the panel, and can recognize that the common voltage electrode at the position is short-circuited. The user can visually check the gradation of each pixel displayed on the panel to easily check whether the common voltage electrode is short-circuited.

8 is a diagram showing gradations displayed on the panel when a short-circuit failure occurs in some common voltage electrodes.

The common voltage electrode driving circuit can supply the first common voltage to the first common voltage electrode group CEG1 and supply the second common voltage to the second common voltage electrode group CEG2 in the pattern as shown in Fig. At this time, the normal common voltage electrode may indicate an intended gradation, for example, a black gradation or a white gradation depending on a common voltage supplied. However, the short-circuited common voltage electrodes 811 and 812 may exhibit unintended gradation-for example, gray gradation-as shown in FIG.

The user can confirm the portion not indicated by the intended gradation (e.g., black gradation or white gradation) in the panel, and can recognize that the common voltage electrode at the position is short-circuited. The user can visually check the gradation of each pixel displayed on the panel to easily check whether the common voltage electrode is short-circuited.

Such a visual inspection process may be carried out in the production process of a panel or a display device. Or the visual inspection process may be carried out in the process of being used after the panel or display is shipped.

On the other hand, the common voltage supplied to each common voltage electrode can be varied according to the time interval.

9 is a first exemplary waveform diagram of a common voltage and a data voltage according to time periods.

Referring to FIG. 9, the data driving circuit can supply the same data voltage to all the pixels in the entire time period (T1 to T3) during which the visual inspection is performed.

The common voltage electrode driving circuit may supply the first common voltage VCOM1 to the first common voltage electrode group in the first time period T1 and supply the second common voltage VCOM2 to the second common voltage electrode group have. Then, the second common voltage VCOM2 is supplied to the first common voltage electrode group in the second time period following the first time interval T1, and the first common voltage VCOM1 is supplied to the second common voltage electrode group .

According to such a waveform, each pixel can be displayed while changing the gradation every time period.

10 is a second exemplary waveform diagram of the common voltage and the data voltage according to the time interval.

Referring to FIG. 10, the common voltage electrode driving circuit supplies the first common voltage VCOM1 to the first common voltage electrode group in the first time period T1, and supplies the second common voltage VCOM2 as the second common voltage electrode group ). Then, the second common voltage VCOM2 is supplied to the first common voltage electrode group in the second time period following the first time interval T1, and the first common voltage VCOM1 is supplied to the second common voltage electrode group .

The data driving circuit can supply the first data voltage VDATA1 corresponding to the first gradation or the first data voltage VDATA1 having the third voltage level to each pixel in the first time period T1. The data driving circuit supplies the second data voltage VDATA2 corresponding to the second gradation different from the first time period T1 in the second time period T2 or the second data voltage VDATA2 corresponding to the second The data voltage VDATA2 can be supplied.

Pixels in the portion where the data voltage and the common voltage are changed in phase are displayed in white gradation and pixels in the portion where the data voltage and the common voltage are in opposite phases can be displayed in black gradation.

The common voltage electrode may be used as a touch electrode. In this embodiment, the common voltage electrode driving circuit supplies the first common voltage to the first common voltage electrode group and supplies the second common voltage to the second common voltage electrode group in the visual inspection period so that the shorting test can be performed can do. In the touch driving section, the common voltage electrode driving circuit supplies a touch driving signal to the first common voltage electrode group and the second common voltage electrode group, and uses a reaction signal for the touch driving signal to touch the external object Or proximity can be sensed.

11 is a view showing that the common voltage electrode driving circuit senses touch or proximity of an external object to a panel.

11, the common voltage electrode driving circuit 140 supplies the touch driving signal STX to the common voltage electrode CE and the response signal SRX to the touch driving signal STX, The touch or proximity of the external object OBJ can be sensed.

The touch driving signal STX may have a waveform that fluctuates at various voltage levels. For example, the touch-driving signal STX may have a waveform that fluctuates to a driving high voltage VDD - for example, 5V- and a driving low voltage VSS - for example, 0V-.

The common voltage electrode driving circuit 140 can generate various voltage levels of the touch driving signal STX. For example, the common voltage electrode driving circuit 140 generates and supplies a driving high voltage VDD to the common voltage electrode CE at a first time point and a driving low voltage VSS at a second time point to generate a common voltage electrode CE).

The common voltage electrode driving circuit 140 can utilize signals of various voltage levels used for generating the touch driving signal STX for visual inspection of the panel. For example, the common voltage electrode driving circuit 140 may supply the driving high voltage VDD to the first common voltage electrode group and the driving low voltage VSS to the second common voltage electrode group.

The common voltage electrode driving circuit 140 may supply a common voltage having a constant voltage level to the common voltage electrode during the display driving period so that an image is displayed on the panel.

As described above, the common voltage electrode driving circuit 140 can perform the functions of visual inspection, touch driving, and display driving while operating in the visual inspection period, the touch driving period, and the display driving period in different ways.

12 is a flowchart of a panel driving method according to another embodiment.

Referring to FIG. 12, the common voltage electrode driving circuit supplies a touch driving signal to a plurality of common voltage electrodes in a touch driving period, and senses touch or proximity of an external object to the panel using a reaction signal for the touch driving signal (S1202). In step S1202, the data driving circuit may supply a signal synchronized in phase with the touch driving signal to the data lines connected to the plurality of pixels in order to reduce the parasitic capacitance between the common voltage electrode and the data line.

In the display driving period, the common voltage electrode driving circuit supplies a common voltage for display driving to a plurality of common voltage electrodes, and the data driving circuit supplies a data voltage corresponding to the video data to the plurality of pixels (S1204) .

In the visual inspection period, the common voltage electrode driving circuit supplies the common voltage (first common voltage) of the first voltage level to the first common voltage electrode group and the second common voltage A common voltage (second common voltage) having a second voltage level different from the first voltage level can be supplied to the electrode group (S1206). In step S1206, the data driving circuit can supply the data voltages corresponding to the same gradation or the data voltages having the same voltage level to the plurality of pixels.

In the visual inspection period, the user can identify the short-circuited common voltage electrode and generate common voltage electrode error data including the position of the failed common voltage electrode. Then, this common voltage electrode error data may be stored in the panel driver (for example, the timing controller) (S1208).

When the common voltage electrode is used as the touch electrode, if a short-circuit failure occurs in the common voltage electrode, an error may also occur in the touch sensing data. For example, when the touch sensing data includes touch coordinates, an error may occur in the touch coordinates. As another example, when the touch sensing data includes the touch sensing value-the amount of change in capacitance, etc., the touch sensing value may be small.

The common voltage electrode driving circuit may sense touch or proximity of an external object to the panel by reflecting the common voltage electrode error data input after the visual inspection period (S1210). For example, the common voltage electrode driving circuit can correct a touch sensing value at a common voltage electrode where a short circuit failure occurs. As another example, in the common voltage electrode driving circuit, touch coordinates may not be generated in the common voltage electrode where a short circuit failure occurs.

According to the embodiment described above, the panel drive apparatus can detect a short-circuit failure of the common voltage electrodes disposed on the panel. When the common voltage electrode is used as the touch electrode, the short circuit failure of the common voltage electrode may also affect the touch sensing data. The panel driving device corrects the touch sensing data using the common voltage electrode error data to increase the touch sensitivity .

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (9)

An apparatus for driving a panel in which a plurality of pixels are arranged and a plurality of common voltage electrodes corresponding to the plurality of pixels are arranged,
(First common voltage) of the first voltage level to the first common voltage electrode group and supplies the second common voltage electrode group to the second common voltage electrode group located adjacent to the first common voltage electrode group A common voltage electrode driving circuit for supplying a common voltage (second common voltage) of a second voltage level; And
A data driving circuit for supplying a data voltage corresponding to a first gradation or a data voltage having a third voltage level to pixels at positions corresponding to the first common voltage electrode group and the second common voltage electrode group,
And the panel driving device. The method according to claim 1,
Wherein pixels at positions corresponding to the first common voltage electrode group substantially represent black and pixels at positions corresponding to the second common voltage electrode group substantially represent white. The method according to claim 1,
The common voltage electrode driving circuit includes:
Supply the first common voltage to the first common voltage electrode group in the first time interval and supply the second common voltage to the second common voltage electrode group, and in the second time interval subsequent to the first time interval And supplies the second common voltage to the first common voltage electrode group and supplies the first common voltage to the second common voltage electrode group. The method of claim 3,
The data driving circuit,
And supplies a data voltage corresponding to a second gradation different from the first time period or a data voltage having a fourth voltage level different from the third voltage level in the second time period. The method according to claim 1,
The common voltage electrode driving circuit includes:
Supplying the first common voltage to the first common voltage electrode group and supplying the second common voltage to the second common voltage electrode group in a visual inspection period,
A touch driving signal is supplied to the first common voltage electrode group and the second common voltage electrode group in a touch driving period and a touch or proximity of an external object to the panel is sensed using a reaction signal for the touch driving signal Panel drive. A method of driving a panel in which a plurality of pixels are arranged and a plurality of common voltage electrodes corresponding to the plurality of pixels are arranged,
Supplying a touch driving signal to the plurality of common voltage electrodes in a touch driving period and sensing touch or proximity of an external object to the panel using a reaction signal for the touch driving signal;
Supplying a common voltage for display driving to the plurality of common voltage electrodes in a display driving period and supplying a data voltage corresponding to the video data to the plurality of pixels; And
(First common voltage) of a first voltage level to a first common voltage electrode group in a visual inspection period and supplies the common voltage (first common voltage) to a second common voltage electrode group positioned adjacent to the first common voltage electrode group, (Second common voltage) of a second voltage level different from the level of the second voltage level
And a panel driving method. The method according to claim 6,
In the step of sensing the touch or proximity,
And a signal synchronized in phase with the touch driving signal is supplied to a data line connected to the plurality of pixels. The method according to claim 6,
In the step of sensing the touch or proximity,
And sensing the touch or proximity of the external object by reflecting the common voltage electrode error data input after the visual inspection period. The method according to claim 6,
And a data voltage corresponding to the same gray level or a data voltage having the same voltage level is supplied to the plurality of pixels in the visual inspection period.

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