KR102458514B1 - Data driving method, data driver, and display panel - Google Patents

Abstract

The present embodiments relate to a data driving method, a data driver, and a display device, by adjusting a data pre-charge voltage based on image data of a next frame, and using the adjusted data pre-charge voltage to provide data for the next frame The present invention relates to a data driving method, a data driver, and a display device capable of efficiently driving data by providing driving in a pre-charge manner, and improving heat generation and screen abnormalities in a driver integrated circuit.

Description

Data driving method, data driver and display device {DATA DRIVING METHOD, DATA DRIVER, AND DISPLAY PANEL}

The present embodiments relate to a data driving method, a data driver, and a display device.

As the information society develops, the demand for display devices for displaying images is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display devices (PDPs), and displays Various display devices such as an organic light emitting display device (OLED) are being used.

In various display devices, each sub-pixel has a capacitor that maintains a constant voltage for image display for one frame, and a data driver in the display device drives each sub-pixel for image display through data driving. It charges my capacitor.

It is necessary to charge the capacitor in each sub-pixel within a predetermined time according to the data driving timing, but the charging time may be insufficient due to various factors.

When such a situation in which the charging time is insufficient occurs, a screen abnormality may occur.

An object of the present embodiments is to provide a data driving method, a data driver, and a display device capable of performing pre-charge-based data driving in order to prevent a charging shortage.

Another object of the present embodiments is to improve the heat generation phenomenon and screen abnormality of the driver integrated circuit that may occur when the data pre-charge voltage used for the pre-charge-based data driving is used as a fixed voltage. An object of the present invention is to provide a data driving method, a data driver, and a display device capable of performing adaptive pre-charge-based data driving.

Another object of the present embodiments is to adaptively change a data pre-charge voltage based on image data for each frame in data driving in the pre-charge method, thereby efficiently driving data and generating heat in the driver integrated circuit. and to provide a data driving method, a data driver, and a display device capable of improving screen abnormalities.

In one aspect, the present embodiments provide a controller for outputting image data of a next frame and outputting a data pre-charge voltage control signal, and a data pre-charge voltage changed or maintained according to the data pre-charge voltage control signal. A display including a data pre-charge voltage output unit for outputting a data pre-charge voltage output unit, and a data driver that converts the image data of the next frame into an analog data voltage and outputs the data voltage in a pre-charge method using the data pre-charge voltage device can be provided.

In another aspect, the present exemplary embodiments include adjusting and outputting a data pre-charge voltage based on image data of a next frame, and a data voltage corresponding to image data of a next frame using the output data pre-charge voltage. It is possible to provide a data driving method including the step of outputting in a pre-charge manner.

In another aspect, the present embodiments provide a data pre-charge control unit that changes a data pre-charge voltage based on image data of a next frame, and a data pre-charge control unit that corresponds to image data of a next frame using the changed data pre-charge voltage. A display device including a data driver for outputting a data voltage in a pre-charge manner may be provided.

In another aspect, the present embodiments may include calculating a data pre-charge voltage based on image data of a next frame, and comparing the calculated data pre-charge voltage with a data pre-charge voltage corresponding to a previous frame. and outputting a data pre-charge voltage corresponding to a previous frame to a data line and outputting a data voltage corresponding to image data of a next frame to the data line when the difference is less than or equal to a threshold value as a result of the comparison; , when the difference exceeds a threshold, outputting the calculated data pre-charge voltage to the data line and outputting the data voltage corresponding to the image data of the next frame to the data line. have.

In another aspect, the present embodiments provide a data voltage using a digital-to-analog converter for converting image data into a data voltage, a data pre-charge voltage input unit receiving a data pre-charge voltage, and a data pre-charge voltage It is possible to provide a data driver including a voltage output unit for outputting the .

The data pre-charge voltage input unit of the data driver may receive a data pre-charge voltage that varies according to image data.

According to the present embodiments as described above, it is possible to provide a data driving method, a data driver, and a display device capable of performing pre-charge-based data driving in order to prevent a charging shortage. have.

According to the present embodiments, an adaptation capable of improving the heat generation phenomenon of the driver integrated circuit and the screen abnormality that may occur when the data pre-charge voltage used for data driving based on the pre-charge is used as a fixed voltage It is possible to provide a data driving method, a data driver, and a display device capable of performing a pre-charge-based data driving.

According to the present embodiments, in data driving in the pre-charge method, by adaptively changing the data pre-charge voltage based on the image data for each frame, efficient data driving, heat generation of the driver integrated circuit, and the screen It is possible to provide a data driving method, a data driver, and a display device capable of improving anomalies.

1 is a schematic system configuration diagram of a display device according to example embodiments.
2 is an exemplary implementation diagram of a display device according to the present embodiments.
3 and 4 are diagrams for explaining a pre-charge-based data driving method according to the present embodiments.
5 is a diagram illustrating a problem in the pre-charge-based data driving according to the present embodiments.
6 and 7 are diagrams for explaining an adaptive pre-charge-based data driving method according to the present embodiments.
8 is a flowchart of an adaptive pre-charge-based data driving method according to the present embodiments.
9 is a detailed flowchart of an adaptive data pre-charge voltage adjustment and output step in the adaptive pre-charge-based data driving method according to the present embodiments.
10 is a diagram illustrating an adaptive pre-charge-based data driving system in the display device according to the present exemplary embodiment.
11 is a flowchart of an adaptive pre-charge-based data driving method according to the present embodiments.
12 is a block diagram of a data driver according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected,” “coupled,” or “connected” through another component.

1 is a schematic system configuration diagram of a display device 100 according to the present embodiments, and FIG. 2 is an exemplary implementation diagram of the display device 100 according to the present embodiments.

Referring to FIG. 1 , in the display device 100 according to the present exemplary embodiments, a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn are disposed, and a plurality of sub-pixels SP: Sub Pixel), the data driver 120 for driving the plurality of data lines DL1 to DLm, and the gate driver 130 for driving the plurality of gate lines GL1 to GLn; The controller 140 controls the data driver 120 and the gate driver 130 , and the like.

The controller 140 supplies various control signals to the data driver 120 and the gate driver 130 to control the data driver 120 and the gate driver 130 .

The controller 140 starts scanning according to the timing implemented in each frame, and converts the input image data input from the outside according to the data signal format used by the data driver 120 to convert the converted image data (Data) output and control the data operation at an appropriate time according to the scan.

The controller 140 may be a timing controller used in a typical display technology or a control device that further performs other control functions including a timing controller.

The data driver 120 drives the plurality of data lines DL1 to DLm by supplying data voltages to the plurality of data lines DL1 to DLm. Here, the data driver 120 is also referred to as a 'source driver'.

The gate driver 130 sequentially drives the plurality of gate lines GL1 to GLn by sequentially supplying scan signals to the plurality of gate lines GL1 to GLn. Here, the gate driver 130 is also referred to as a 'scan driver'.

The gate driver 130 sequentially supplies a scan signal of an on voltage or an off voltage to the plurality of gate lines GL1 to GLn under the control of the controller 140 .

When a specific gate line is opened by the gate driver 130 , the data driver 120 converts the image data received from the controller 140 into an analog data voltage and supplies it to the plurality of data lines DL1 to DLm. .

Although the data driver 120 is located only on one side (eg, upper or lower side) of the display panel 110 in FIG. 1 , the data driver 120 is located on both sides (eg, upper and lower sides) of the display panel 110 according to a driving method and a panel design method. ) may be located in

Although the gate driver 130 is located only on one side (eg, left or right) of the display panel 110 in FIG. 1 , the gate driver 130 is located on both sides (eg, left and right side) of the display panel 110 according to a driving method, a panel design method, etc. may be located on the right).

The above-described controller 140, along with the input image data, a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), an input data enable (DE: Data Enable) signal, various types including a clock signal (CLK), etc. Timing signals are received from the outside (eg host system).

The controller 140 converts the input image data input from the outside to match the data signal format used by the data driver 120 and outputs the converted image data, as well as the data driver 120 and the gate driver 130 . In order to control the data driver 120 and the gate driver 130 by receiving a timing signal such as a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), an input DE signal, and a clock signal to generate various control signals output as

For example, in order to control the gate driver 130 , the controller 140 may include a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable signal (GOE). Various gate control signals (GCS: Gate Control Signal) including Gate Output Enable) are output.

Here, the gate start pulse GSP controls the operation start timing of one or more gate driver integrated circuits constituting the gate driver 130 . The gate shift clock GSC is a clock signal commonly input to one or more gate driver integrated circuits and controls shift timing of a scan signal (gate pulse). The gate output enable signal GOE specifies timing information of one or more gate driver integrated circuits.

In addition, the controller 140 controls the data driver 120 , a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE: Source Output). Enable) and output various data control signals (DCS: Data Control Signal).

Here, the source start pulse SSP controls the data sampling start timing of one or more source driver integrated circuits constituting the data driver 120 . The source sampling clock SSC is a clock signal that controls sampling timing of data in each of the source driver integrated circuits. The source output enable signal SOE controls the output timing of the data driver 120 .

Referring to FIG. 2 , the data driver 120 may drive a plurality of data lines DL1 to DLm including at least one source driver integrated circuit (SDIC) 200 .

Each source driver integrated circuit 200 is connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) method, or , may be directly disposed on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases.

In addition, as shown in FIG. 2 , each source driver integrated circuit 200 may be implemented in a chip on film (COF) method mounted on a film 201 connected to the display panel 110 . .

Each source driver integrated circuit 200 may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

Each source driver integrated circuit 200 may further include an analog-to-digital converter (ADC) in some cases.

The gate driver 130 may include at least one gate driver integrated circuit (GDIC).

Each gate driver integrated circuit GDIC is connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or a gate in panel (GIP) type. may be implemented and disposed directly on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases. In addition, each gate driver integrated circuit GDIC may be implemented in a chip-on-film (COF) method mounted on a film connected to the display panel 110 .

Each gate driver integrated circuit GDIC may include a shift register, a level shifter, and the like.

Referring to FIG. 2 , the display device 100 according to the present exemplary embodiments includes at least one source printed circuit board (S-PCB) required for circuit connection to at least one source driver integrated circuit 200 . Circuit Boards 210a, 210b) and a control printed circuit board (C-PCB: Control Printed Circuit Board, 230) for mounting control components and various electric devices may be included.

At least one source driver integrated circuit 200 is mounted on at least one source printed circuit board 210a, 210b, or at least one source driver integrated circuit 200 is mounted thereon, as shown in FIG. 2 . 201 may be connected.

The control printed circuit board 230 includes a controller 140 that controls operations of the data driver 120 and the gate driver 130 , the display panel 110 , the data driver 120 , the gate driver 130 , and the like. A power controller that supplies various voltages or currents or controls various voltages or currents to be supplied may be mounted.

At least one source printed circuit board (210a, 210b) and the control printed circuit board 230 may be connected in a circuit through at least one connecting member (220a, 220b).

Here, the connection members 220a and 220b may be a flexible printed circuit (FPC), a flexible flat cable (FFC), or the like.

At least one of the source printed circuit boards 210a and 210b and the control printed circuit board 230 may be integrated into one printed circuit board.

The display device 100 according to the present embodiments may be various types of devices such as a liquid crystal display device, an organic light emitting display device, and a plasma display device. have.

Each subpixel SP disposed on the display panel 110 may include circuit elements such as transistors and capacitors.

For example, when the display panel 110 is an organic light emitting display panel, each sub-pixel SP is composed of an organic light emitting diode (OLED) and circuit elements such as a transistor and a capacitor for driving it. have.

The type and number of circuit elements constituting each sub-pixel SP may be variously determined according to a provided function and a design method.

As described above, each sub-pixel SP has a capacitor that must maintain a constant voltage for image display for one frame, and a capacitor in each sub-pixel SP is charged through data driving for image display.

On the other hand, although the capacitor in each sub-pixel must be charged within a predetermined time according to the data driving timing, the charging time may be insufficient due to various factors.

When such a situation in which the charging time is insufficient occurs, a screen abnormality may occur. Accordingly, in order to prevent insufficient charging, the display device 100 according to the present exemplary embodiments may provide data driving based on pre-charge.

Hereinafter, a pre-charge-based data driving method provided by the display device 100 according to the present exemplary embodiments will be described.

3 and 4 are diagrams for explaining a pre-charge-based data driving method according to the present embodiments.

Referring to FIG. 3 , the data driver 120 outputs the data voltage Vdata to the corresponding data line according to the source output enable signal SOE.

In this case, the data driver 120 applies a data pre-charge voltage (VpreD: Vdata Pre-Charge Voltage) to the corresponding data during the high-level section of the source output enable signal SOE for pre-charge-based data driving. After outputting to the line in advance, the actual data voltage (Vdata) is output to the corresponding data line.

That is, the signal Vout output from the data driver 120 is the data pre-charge voltage VpreD when the source enable output signal SOE is in the high level section, and the source enable output signal SOE is In the case of the low level section, it may be the data voltage Vdata.

Here, as shown in FIG. 4 , the data pre-charge voltage VpreD used by the data driver 120 for pre-charge-based data driving is the data pre-charge voltage output unit 400 from the data driver. It may be supplied to each source driver integrated circuit 200 of 120 .

Referring to FIG. 4 , the data pre-charge voltage VpreD output from the data pre-charge voltage output unit 400 is the control printed circuit board 230 , the connection members 220a and 220b , and the source printed circuit board 210a. , 210b) and the film 201 may be supplied to each source driver integrated circuit 200 of the data driver 120 .

Through the above-described pre-charge-based data driving, the capacitor serving to maintain a constant voltage for image display for one frame in the corresponding sub-pixel is pre-charged with the data pre-charge voltage VpreD. The data voltage Vdata may be charged more quickly.

Accordingly, the voltage swing width when the pre-charge technique is not applied is ΔV1, but the voltage swing width when the pre-charge technique is applied may be reduced to ΔV2.

In other words, by speeding up the charging speed of a capacitor to be charged for displaying an image through the pre-charge-based data driving, it is possible to prevent an image from being abnormally displayed due to insufficient charging.

In the case of pre-charge-based data driving, several problems may occur in spite of the above-described advantages. This will be described with reference to FIG. 5 .

5 is a diagram illustrating a problem in the pre-charge-based data driving according to the present embodiments.

The data pre-charge voltage VpreD used for pre-charge-based data driving may generally correspond to a predetermined ratio (eg, 1/2) of the data voltage Vdata for image display.

For example, when the data voltage Vdata for image display is 18V, the data pre-charge voltage VpreD used for pre-charge-based data driving may be 9V, which is 1/2 of 18V. .

As such, when the data pre-charge voltage VpreD used for data driving based on the pre-charge is used as a fixed voltage, panel characteristics change cannot be reflected, and each source driver of the data driver 120 is The possibility that the integrated circuit 200 generates heat may increase.

Also, when the fixed data pre-charge voltage VpreD is used, a screen abnormality may occur due to pre-charging inappropriate for the data voltage Vdata.

Accordingly, the present embodiments provide adaptive pre-charge-based data driving in order to solve the heat problem of the source driver integrated circuit 200 and the screen abnormality problem caused by the use of the fixed data pre-charge voltage VpreD. method can be provided.

Hereinafter, an adaptive pre-charge-based data driving method will be described in more detail with reference to FIGS. 6 to 12 .

6 and 7 are diagrams for explaining an adaptive pre-charge-based data driving method according to the present embodiments.

Referring to FIG. 6 , the display device 100 according to the present exemplary embodiments includes a controller 140 that outputs image data for each frame, and a data pre-charge voltage output unit that outputs a data pre-charge voltage VpreD. 400 , a data driver 120 that receives image data from the controller 140 , converts it into a data voltage Vdata corresponding to an analog voltage, and outputs the data voltage Vdata to a data line, and the like.

The controller 140 outputs a data control signal DCS such as a source output enable signal SOE and image data of a next frame to display an image, and also controls the adaptive pre-charge-based data driving. For this purpose, a data pre-charge voltage control signal (VpreD Control Signal) may be output.

Accordingly, the controller 140 determines whether or not to change the data pre-charge voltage with reference to the image data, and generates a data pre-charge voltage control signal generating unit ( 600) may be included.

The data pre-charge voltage output unit 400 initially outputs the data pre-charge voltage VpreD set to an initial value, and thereafter, the data pre-charge voltage control signal VpreD Control received from the controller 140 . Signal), by changing or maintaining the data pre-charge voltage VpreD, the changed or maintained data pre-charge voltage VpreD may be output.

Referring to FIG. 7 , the data driver 120 converts image data of the next frame received from the controller 140 into an analog data voltage Vdata, and a data voltage according to the source output enable signal SOE. (Vdata) is output to the data line, but the data voltage Vdata may be output in a pre-charge manner using the data pre-charge voltage VpreD received from the data pre-charge voltage output unit 400 .

Referring to FIG. 7 , the high level section of the source output enable signal SOE is a pre-charge section by the data pre-charge voltage VpreD, and the low level section of the source output enable signal SOE is the data voltage It is a data charge section by (Vdata).

Referring to FIG. 7 , the data pre-charge voltage VpreD used for pre-charging during the high level period of the source output enable signal SOE may be maintained without changing according to image data change. and may be variable.

As described above, by performing data driving using an adaptive pre-charge technique that can vary the data pre-charge voltage VpreD, efficient data driving is possible, and the heat problem of the source driver integrated circuit 200 is eliminated. It can also prevent screen abnormalities.

Referring to FIG. 6 , the controller 140 outputs the data voltage Vdata in which the image data of the previous frame is converted based on the image data of the next frame (simply also referred to as frame data). A data pre-charge voltage control signal VpreD Control Signal indicating whether the used data pre-charge voltage VpreD is changed or a change level (change level) may be output.

As described above, the data pre-charge voltage VpreD may be varied to suit the image data. That is, in consideration of the image condition of each frame, charging can be performed at an appropriate timing, and unnecessary heat generation of the data driver 120 and screen abnormalities can be prevented.

More specifically, it prevents the charging time from running short through adaptive data pre-charging according to the image conditions (brightness, gradation, etc.) of each frame. It is possible to prevent screen abnormalities that occur, or to prevent unnecessary heat from being generated in the data driver 120 due to excessively fast charging.

The above-described controller 140 includes a data pre-charge voltage VpreD required for image data of a next frame and a data pre-charge voltage (Vdata) used when outputting a data voltage Vdata converted from image data of a previous frame ( VpreD) to determine whether to change the data pre-charge voltage VpreD used when outputting the data voltage Vdata in which the image data of the previous frame is converted, and to change the data pre-charge voltage VpreD A data pre-charge voltage control signal (VpreD Control Signal) indicating whether or not or a change level may be output.

As described above, the data pre-charge voltage VpreD required for the image data of the next frame and the data pre-charge voltage VpreD used when outputting the data voltage Vdata converted from the image data of the previous frame By comparing and controlling whether or not the data pre-charge voltage is changed or the level of change (change level), the data pre-charge voltage may be more adaptively changed according to changes in image data.

Meanwhile, the controller 140 compares the image data of the next frame with the image data of the previous frame, and the data pre-charge voltage control signal VpreD Control indicating whether or not the data pre-charge voltage VpreD is changed or the level of change. signal) can also be output.

As described above, instead of comparing the data pre-charge voltage, by comparing the image data of the next frame and the image data of the previous frame to control whether or not the data pre-charge voltage is changed or the level of change (change level), the data There is no need to memorize the pre-charge voltage, and the data-pre-charge voltage can be changed easily and conveniently by comparing image data between frames.

Meanwhile, in the display device 100 according to the present exemplary embodiments, according to the adaptive data pre-charge voltage control of the controller 140 , the image brightness corresponding to the image data of the next frame and the image data corresponding to the image data of the previous frame are When the brightness difference of the image brightness is within a predetermined reference brightness difference range, the data pre-charge voltage VpreD is maintained, and the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame are maintained. When the brightness difference exceeds the upper limit of the reference brightness difference range, the data pre-charge voltage (VpreD) is changed high to correspond to the increase in the brightness difference, and the image brightness corresponding to the image data of the next frame and the image data of the previous frame When the brightness difference of the corresponding image brightness is less than the lower limit of the reference brightness difference range, the data pre-charge voltage VpreD may be changed low to correspond to the decrease in the brightness difference.

Here, the higher the data voltage, the brighter the image, and the lower the data voltage, the darker the image.

Therefore, by adaptively adjusting the data pre-charge voltage (VpreD) based on the brightness difference of the image brightness between frames in consideration of the image brightness that can reflect the data voltage, efficient data driving based on the brightness difference between frames can be achieved. can provide

Meanwhile, in the display device 100 according to the present embodiments, according to the adaptive data pre-charge voltage control of the controller 140, when the image brightness corresponding to the image data of the next frame is within the reference brightness range, the data The pre-charge voltage VpreD is maintained, and when the image brightness corresponding to the image data of the next frame exceeds the upper limit brightness of the reference brightness range, the data pre-charge voltage VpreD is changed high to correspond to the increase in brightness, , when the image brightness corresponding to the image data of the next frame is less than the lower limit of the reference brightness range, the data pre-charge voltage VpreD may be changed to be low corresponding to the decrease in brightness.

Here, the higher the data voltage, the brighter the image, and the lower the data voltage, the darker the image.

Accordingly, by adaptively adjusting the data pre-charge voltage VpreD in consideration of only the image brightness of the next frame that can reflect the data voltage, adaptive pre-charge-based data driving can be easily and conveniently provided.

8 is a flowchart of an adaptive pre-charge-based data driving method according to the present embodiments.

Referring to FIG. 8 , the adaptive pre-charge-based data driving method according to the present embodiments includes the steps of adjusting and outputting a data pre-charge voltage VpreD based on image data of a next frame (S810); , and outputting the data voltage Vdata corresponding to the image data of the next frame in a pre-charge manner using the output data pre-charge voltage VpreD ( S820 ).

9 is a detailed flowchart of an operation ( S810 ) of adaptively adjusting and outputting the data pre-charge voltage VpreD in the adaptive pre-charge-based data driving method according to the present embodiments.

Referring to FIG. 9 , the step of adjusting and outputting the adaptive data pre-charge voltage VpreD ( S810 ) includes calculating the data pre-charge voltage VpreD_n required for the image data of the next frame ( S910 ) and , comparing the calculated data pre-charge voltage VpreD_n with the data pre-charge voltage VpreD_n-1 used when outputting the data voltage Vdata converted from the image data of the previous frame (S920); As a result of the step comparison, if the same or the difference is less than or equal to a predetermined threshold, the data pre-charge voltage (VpreD) to be used when outputting the data voltage (Vdata) corresponding to the image data of the next frame is applied to the image data of the previous frame. When the data pre-charge voltage VpreD_n-1 used when the corresponding data voltage Vdata is output is compared with the step S930 and step S920, if the difference is different or the difference exceeds the threshold, then As the data pre-charge voltage VpreD to be used when outputting the data voltage Vdata corresponding to the image data of the frame, the data pre-charge voltage used when the data voltage Vdata corresponding to the image data of the previous frame is output ( The step of changing VpreD_n-1) to the calculated data pre-charge voltage VpreD_n ( S940 ), and the data pre-charge voltage VpreD to be used when outputting the data voltage Vdata corresponding to the image data of the next frame It may include outputting (S950) and the like.

By using the above-described adaptive pre-charge-based data driving method, it is possible to efficiently drive data while preventing the heat generation problem and screen abnormality problem of the source driver integrated circuit 200 .

Referring to FIG. 8 , in step S820 of outputting the data voltage in a pre-charge manner, the data driver 120 outputs the data pre-charge voltage output unit 400 in step S810 as shown in FIG. 7 . The obtained data pre-charge voltage is output to the corresponding data line during the high-level period of the source output enable signal SOE, and the data voltage Vdata corresponding to the image data of the next frame is applied to the source output enable signal SOE. It can be output to the corresponding data line during the low level section.

Accordingly, the data driver 120 may efficiently provide adaptive pre-charge-based data driving according to the source output enable signal SOE.

10 is a diagram illustrating an adaptive pre-charge-based data driving system in the display device 100 according to the present exemplary embodiments.

Referring to FIG. 10 , in the adaptive pre-charge-based data driving system in the display device 100 according to the present exemplary embodiments, data for changing the data pre-charge voltage VpreD based on image data of a next frame Includes a pre-charge control unit 1000 and a data driver 120 that outputs a data voltage Vdata corresponding to image data of a next frame in a pre-charge method using the changed data pre-charge voltage VpreD. can do.

As described above, using the adaptive pre-charge-based data driving method provides a data driving system that enables efficient data driving and prevents heat generation problems and screen abnormalities of the source driver integrated circuit 200 . can do.

The aforementioned data pre-charge control unit 1000 may include at least one of the controller 140 and the data pre-charge voltage output unit 400 .

11 is a flowchart of an adaptive pre-charge-based data driving method according to the present embodiments.

Referring to FIG. 11 , the adaptive pre-charge-based data driving method of the display device 100 according to the present exemplary embodiments includes calculating a data pre-charge voltage VpreD_n based on image data of a next frame. ( S1110 ) and comparing the calculated data pre-charge voltage VpreD_n with the data pre-charge voltage VpreD_n-1 corresponding to the previous frame ( S1120 ). As a result of the comparison, the difference is the threshold value TH In the following case, outputting the data pre-charge voltage VpreD_n-1 corresponding to the previous frame to the data line and outputting the data voltage Vdata corresponding to the image data of the next frame to the data line (S1130) and comparison As a result, when the difference exceeds the predetermined threshold value TH, the calculated data pre-charge voltage VpreD_n is output to the data line and the data voltage Vdata corresponding to the image data of the next frame is output to the data line It may include a step (S1140) and the like.

The calculated data pre-charge voltage VpreD or the data pre-charge voltage VpreD corresponding to the previous frame is transferred to the data line in the high-level section of the source output enable signal SOE, as shown in FIG. 7 . can be output.

Using the above-described adaptive pre-charge-based data driving method, the required data pre-charge voltage VpreD_n is newly calculated for every frame, and the newly calculated data pre-charge voltage VpreD_n is used in the previous frame. By varying the data pre-charge voltage (VpreD) to be used in the next frame compared to the data pre-charge voltage (VpreD_n-1), it is possible to efficiently drive data, and the heat problem of the source driver integrated circuit 200 and the screen abnormality problem It can also be prevented.

12 is a block diagram of the data driver 120 according to the present embodiments.

Referring to FIG. 12 , the data driver 120 according to the present exemplary embodiments includes a digital-to-analog converter 1210 that converts image data into a data voltage Vdata, and data supplied with a data pre-charge voltage VpreD. It may include a pre-charge voltage input unit 1220 and a voltage output unit 1230 that outputs the data voltage Vdata to the data line in a pre-charging method using the data pre-charge voltage VpreD. .

The data pre-charge voltage input unit 1220 may receive a data pre-charge voltage VpreD that varies according to image data.

That is, the data pre-charge voltage VpreD is the same as the data pre-charge voltage VpreD_n-1 used when the data voltage Vdata corresponding to the previous frame is output, or image data for the next frame of the previous frame The data pre-charge voltage VpreD_n may be changed based on .

When the data driver 120 described above is used, data driving is provided through adaptive pre-charging using a data pre-charge voltage suitable for image data, thereby increasing data driving efficiency, and the source driver integrated circuit ( 200) can also prevent the problem of overheating and screen abnormalities.

According to the present embodiments as described above, in order to prevent insufficient charging, a data driving method capable of performing pre-charge-based data driving, the data driver 120 and the display device ( 100) can be provided.

According to the present embodiments, an adaptation capable of improving the heat generation phenomenon of the driver integrated circuit and the screen abnormality that may occur when the data pre-charge voltage used for data driving based on the pre-charge is used as a fixed voltage It is possible to provide a data driving method, a data driver 120 , and a display device 100 capable of performing a typical pre-charge-based data driving.

According to the present embodiments, in data driving in the pre-charge method, by adaptively changing the data pre-charge voltage based on the image data for each frame, efficient data driving, heat generation of the driver integrated circuit, and the screen It is possible to provide a data driving method, a data driver 120 , and a display device 100 capable of improving anomalies.

The above description and the accompanying drawings are merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can combine configurations within a range that does not depart from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: display device
110: display panel
120: data driver
130: gate driver
140: controller

Claims (11)

a controller outputting image data of a next frame and outputting a data pre-charge voltage control signal;
a data pre-charge voltage output unit for outputting a data pre-charge voltage changed or maintained according to the data pre-charge voltage control signal; and
and a data driver that converts the image data of the next frame into an analog data voltage and outputs the data voltage in a pre-charge manner using the data pre-charge voltage,
When the comparison result based on the image data of the next frame is less than or equal to a preset reference range, the data pre-charge voltage is maintained to be the same as the data pre-charge voltage used when the data voltage corresponding to the previous frame is output,
When the comparison result based on the image data of the next frame exceeds the preset reference range, the data pre-charge voltage is changed,
When the image brightness corresponding to the image data of the next frame is within the reference brightness range, the data pre-charge voltage is maintained;
When the image brightness corresponding to the image data of the next frame exceeds the upper limit brightness of the reference brightness range, the data pre-charge voltage is changed to be high corresponding to the increase in brightness,
When the image brightness corresponding to the image data of the next frame is less than the lower limit of the reference brightness range, the data pre-charge voltage is changed to be low corresponding to the decrease in brightness. delete delete delete delete a controller outputting image data of a next frame and outputting a data pre-charge voltage control signal;
a data pre-charge voltage output unit for outputting a data pre-charge voltage changed or maintained according to the data pre-charge voltage control signal; and
and a data driver that converts the image data of the next frame into an analog data voltage and outputs the data voltage in a pre-charge manner using the data pre-charge voltage,
When the comparison result based on the image data of the next frame is less than or equal to a preset reference range, the data pre-charge voltage is maintained to be the same as the data pre-charge voltage used when the data voltage corresponding to the previous frame is output,
When the comparison result based on the image data of the next frame exceeds the preset reference range, the data pre-charge voltage is changed,
When the brightness difference between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame is within a reference brightness difference range, the data pre-charge voltage is maintained;
When the brightness difference between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame exceeds the upper limit of the reference brightness difference range, the data pre-charge voltage corresponds to an increase in the brightness difference changed very high,
When the brightness difference between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame is less than the lower limit of the reference brightness difference range, the data pre-charge voltage is lowered to correspond to the decrease in the brightness difference. changing display. A data driving method for a display device, comprising:
adjusting and outputting a data pre-charge voltage based on image data of a next frame; and
and outputting a data voltage corresponding to the image data of the next frame in a pre-charge manner by using the output data pre-charge voltage;
The step of adjusting and outputting the data pre-charge voltage includes:
maintaining the data pre-charge voltage when the image brightness corresponding to the image data of the next frame is within a reference brightness range;
changing the data pre-charge voltage to be high to correspond to the increase in brightness when the brightness of the image corresponding to the image data of the next frame exceeds the upper limit brightness of the reference brightness range; and
and changing the data pre-charge voltage to a lower level corresponding to a decrease in brightness when the brightness of an image corresponding to the image data of the next frame is less than a lower limit of the reference brightness range. A data driving method for a display device, comprising:
adjusting and outputting a data pre-charge voltage based on image data of a next frame; and
and outputting a data voltage corresponding to the image data of the next frame in a pre-charge manner by using the output data pre-charge voltage;
The step of adjusting and outputting the data pre-charge voltage includes:
maintaining the data pre-charge voltage when the difference between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame is within a reference brightness difference range;
When the brightness difference between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame exceeds the upper limit of the reference brightness difference range, the data pre-charge voltage is set to correspond to the increase in brightness. changing to high;
When the brightness difference between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame is less than the lower limit of the reference brightness difference range, the data pre-charge voltage is lowered to correspond to the decrease in the brightness difference changing step; and
and outputting a data pre-charge voltage to be used when outputting a data voltage corresponding to the image data of the next frame. 8. The method of claim 7,
The step of outputting the data voltage in a pre-charge manner includes:
The output data pre-charge voltage is output to a data line during the high level period of the source output enable signal, and the data voltage corresponding to the image data of the next frame is output to the data line during the low level period of the source output enable signal output as
The data line is included in the display device. a digital-to-analog converter that converts image data into data voltage;
a data pre-charge voltage input unit receiving a data pre-charge voltage; and
a voltage output unit for outputting the data voltage to a data line in a pre-charging manner using the data pre-charge voltage;
the data pre-charge voltage input unit receives the data pre-charge voltage that varies according to the image data;
The data pre-charge voltage input unit,
When the image brightness corresponding to the image data of the next frame is within the reference brightness range, the maintained data pre-charge voltage is supplied;
When the image brightness corresponding to the image data of the next frame exceeds the upper limit brightness of the reference brightness range, the data pre-charge voltage changed to be high corresponding to the increase in brightness is supplied;
When the image brightness corresponding to the image data of the next frame is less than the lower limit of the reference brightness range, the data driver is supplied with the data pre-charge voltage changed to a lower value corresponding to the decrease in brightness. a digital-to-analog converter that converts image data into data voltage;
a data pre-charge voltage input unit receiving a data pre-charge voltage; and
a voltage output unit for outputting the data voltage to a data line in a pre-charging manner using the data pre-charge voltage;
the data pre-charge voltage input unit receives the data pre-charge voltage that varies according to the image data;
The data pre-charge voltage input unit,
When the brightness difference between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame is within a reference brightness difference range, the maintained data pre-charge voltage is supplied;
When the brightness difference between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame exceeds the upper limit of the reference brightness difference range, the data free changed to be high to correspond to the increase in the brightness difference - receive the charge voltage,
When the difference in brightness between the image brightness corresponding to the image data of the next frame and the image brightness corresponding to the image data of the previous frame is less than the lower limit of the reference brightness difference range, the data pre-charge changed to be low corresponding to the decrease in the brightness difference A data driver powered by voltage.

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