KR102191976B1 - Apparatus and method for compensating data of orgainc emitting diode display device - Google Patents

Abstract

The present invention relates to a data compensation method and apparatus for an OLED display device capable of reducing a time for updating compensation information by sensing a characteristic of a subpixel. A data compensation method according to an embodiment is provided in a data driver during a sensing mode. Receiving precharge data from a timing controller, converting it into a precharge voltage, and supplying the converted precharge voltage to a data line of the display panel to drive a plurality of subpixels of the display panel; Sensing and holding a sensing signal including characteristics of a plurality of subpixels driven by the data driver; Selectively converting the sensing signal held by the data driver into sensing data and storing it in an output latch unit; Storing a plurality of sensing data in the output latch unit by repeating a sequence of selecting a sensing signal held by a data driver and converting and storing sensing data; Transmitting sensing data stored in the data driver to a timing controller; And updating the compensation information stored in the memory by processing the sensing data transmitted from the data driver in the timing controller.

Description

Data compensation method and apparatus of an organic light emitting diode display device {APPARATUS AND METHOD FOR COMPENSATING DATA OF ORGAINC EMITTING DIODE DISPLAY DEVICE}

The present invention relates to an organic light emitting diode (OLED) display device, and in particular, to a data compensation method and apparatus for an OLED display device capable of reducing the time to update compensation information by sensing the characteristics of a subpixel. About.

Recently, flat panel displays that display images using digital data include Liquid Crystal Display (LCD) using liquid crystal, OLED display using OLED, and Electrophoretic Display (EPD) using electrophoretic particles. ) Are representative.

Among them, the OLED display is a self-luminous device that emits light through the organic emission layer by recombination of electrons and holes, and is expected to be a next-generation display device due to its high luminance, low driving voltage, and ultra-thin film.

Each of the plurality of pixels (subpixels) constituting the OLED display includes an OLED element composed of an organic light emitting layer between an anode and a cathode, and a pixel circuit for independently driving the OLED element. The pixel circuit includes at least a switching transistor and a storage capacitor and a driving transistor. The switching transistor charges a voltage corresponding to the data signal in the storage capacitor in response to the scan pulse, and the driving transistor controls the amount of light emitted from the OLED device by controlling the current supplied to the OLED device according to the voltage charged in the storage capacitor. The amount of light emitted by the OLED is proportional to the current supplied from the driving transistor.

OLED display devices have a problem of non-uniformity in luminance between subpixels due to various causes. For example, there is a difference in driving characteristics for each sub-pixel such as threshold voltage (hereinafter Vth) and mobility of the driving TFT due to process variations, and the deterioration of the driving TFT or OLED device that appears as the driving time elapses. As a result, the driving characteristics for each pixel are varied, and the pixel current is varied, thereby causing a problem of luminance non-uniformity compared to the same data.

In order to solve this problem, an OLED display device uses a data external compensation method that senses characteristic information of each subpixel and compensates for video data using the sensing information.

For real-time external compensation, the OLED display senses a voltage including the characteristics of a subpixel through a data driver every blanking period, which is a non-display period of the vertical synchronization signal, converts the sensed voltage to digital sensing data, and transmits it to the timing controller. Are doing.

Since the subpixel sensing period is limited to the blanking period to prevent printing to the user, a conventional OLED display device senses one subpixel in the blanking period, converts the sensed voltage to sensing data, and then senses the converted sensing. A time sequence in which data is transmitted to the timing controller during the display period of the vertical synchronization signal is used.

For this reason, in an OLED display device using a conventional time sequence, the number of subpixels that can be sensed in the blanking period is limited to one. In order to sense all subpixels in one frame, the vertical synchronization signals corresponding to the total number of subpixels are It should take time.

Accordingly, as the resolution increases, the time for updating the compensation information by sensing the change in the characteristics of the sub-pixel increases, so that it is difficult to update the compensation information by sensing the change in the characteristics of the sub-pixel in real time.

The present invention was conceived to solve the above-described problem, and the problem to be solved by the present invention is a data compensation method and apparatus for an OLED display device capable of reducing the time for updating compensation information by sensing characteristics of a subpixel, in particular Is to provide.

In order to solve the above problem, the data compensation method of an OLED display device according to an embodiment of the present invention is, during a sensing mode, a data driver receives precharge data from a timing controller, converts it to a precharge voltage, and converts the converted precharge voltage. Supplying the data to a data line of the display panel to drive a plurality of subpixels of the display panel; Sensing and holding a sensing signal including characteristics of a plurality of subpixels driven by the data driver; Selectively converting the sensing signal held by the data driver into sensing data and storing it in an output latch unit; Storing a plurality of sensing data in the output latch unit by repeating a sequence of selecting a sensing signal held by a data driver and converting and storing sensing data; Transmitting sensing data stored in the data driver to a timing controller; And updating the compensation information stored in the memory by processing the sensing data transmitted from the data driver in the timing controller.

In the method of compensating data for an OLED display according to an embodiment of the present invention, during a sensing mode, a data driver receives precharge data from a timing controller and converts it to a precharge voltage, and converts the converted precharge voltage to a data line of the display panel. Supplying and driving a plurality of subpixels of the display panel; Sensing a sensing signal including characteristics of a plurality of subpixels driven by the data driver, converting the sensing signal into sensing data, and storing it in a memory; Storing a plurality of sensing data in a memory by repeating a sequence of sensing a sensing signal and converting and storing the sensing signal in the data driver; Transmitting sensing data stored in the memory to a timing controller; And updating compensation information stored in another memory by processing the sensing data transmitted from the memory in the timing controller.

A data compensating device for an OLED display according to an embodiment of the present invention includes a display panel in which each of pixels constituting a pixel array includes a plurality of subpixels; A data driver for driving a subpixel through a driving channel, sensing a sensing signal including characteristics of the subpixel through a sensing channel, converting the sensing signal into sensing data, and outputting the sensing data; A timing controller that controls driving of the data driver and compensates for data to be supplied to the data driver by processing sensing data transmitted from the data driver; During the sensing mode, the data driver receives precharge data from a timing controller through a driving channel and converts it into a precharge voltage, and supplies the converted precharge voltage to the data lines of the display panel. Driving subpixels; Through a sensing channel, sensing signals including characteristics of a plurality of driven subpixels are sensed, sampled, and held, the held sensing signal is selectively converted into sensing data and stored, and the sensing signal is selectively converted into sensing data. A plurality of sensing data is stored by repeating the sequence stored in the internal or external memory, and the sensing data stored in the internal or external memory is transmitted to the timing controller, and the timing controller processes the transmitted sensing data and the compensation information stored in the other memory. And the data to be supplied to the data driver is compensated using the updated compensation information.

The data driver includes a driving unit that drives a driving channel and a sensing unit connected to the sensing channel. The sensing unit includes a plurality of sampling and holders for sampling and holding a sensing signal individually supplied from a plurality of subpixels through a sensing channel; A multiplexer/scaler for selectively scaling and outputting sensing signals from a plurality of sampling and holders; An ADC converting a sensing signal from a multiplexer into the sensing data and outputting the converted data; An output latch unit which is an internal memory that sequentially stores sensing data from the ADC and then transmits a plurality of stored sensing data to the timing controller may be provided.

The data driver includes a driving unit for driving a driving channel and a sensing unit connected to the sensing channel; The sensing unit includes a plurality of sampling and holders for sampling and holding a sensing signal individually supplied from a plurality of subpixels through a sensing channel; A multiplexer/scaler for selectively scaling and outputting sensing signals from a plurality of sampling and holders; An ADC that converts a sensing signal from the multiplexer into sensing data and outputs it, and an external memory connected between the data driver and the timing controller sequentially stores the sensing data from the ADC, and then stores the stored sensing data to the timing controller. Can be transmitted.

The multiplexer/scaler, the ADC, the output latch unit or the external memory repeats the operation of the sensing mode until a plurality of sensing data is stored.

The driving channel and the sensing channel are data lines of the display panel; The driving channel may be a reference line and a data line, and the sensing channel may be a reference line.

The sensing mode may be included in at least one of a boot time when power is on, a vertical blank period of a vertical synchronization signal, and an end time when power is off. When the sensing mode is included in the vertical blank period of the vertical synchronization signal, sensing data sensed and stored from a plurality of subpixels during the vertical blank period may be transmitted to the timing controller in a display period following the vertical blank period of the vertical synchronization signal. .

The OLED display data compensation method and apparatus according to the present invention sense and hold a voltage from a subpixel in a blanking period of a vertical synchronization signal, and then selectively convert the held voltage into sensing data and repeat a sequence of latching, or By sensing the voltage from the pixel, converting it to sensing data, repeating the latching sequence, and transmitting a plurality of latched sensing data to the timing controller during the display period of the vertical synchronization signal, the number of subpixels sensed even within the limited blanking period can be increased. I can.

Accordingly, the OLED display data compensation method and apparatus according to the present invention can reduce the time to update the compensation information by sensing the characteristics of all subpixels, and thus, there is an effect of increasing the real-time compensation speed even when the resolution is increased. .

1 is a block diagram illustrating an OLED display device according to an exemplary embodiment of the present invention.
2 is a block diagram showing the internal configuration of the data driver shown in FIG. 1.
3 is a timing diagram showing a sensing and transmission sequence of the data driver shown in FIG. 2.
4 is a flowchart showing step by step a method of compensating for real-time data of an OLED display device according to an exemplary embodiment of the present invention.
5 is a block diagram illustrating an OLED display device according to another exemplary embodiment of the present invention.

1 is a block diagram schematically illustrating an OLED display device according to an exemplary embodiment of the present invention.

The OLED display device shown in FIG. 1 includes a timing controller 10, a data driver 20, a gate driver 30, a gamma voltage generator 40, a display panel 50, and a memory 60.

The timing controller 10 generates a data control signal and a gate control signal that respectively control driving timings of the data driver 20 and the gate driver 30 using a plurality of synchronization signals input from the outside, and the data driver 20 And output to the gate driver 30.

The timing controller 10 modulates an input image through various data modulation methods for improving image quality or reducing power consumption, and outputs it to the data driver 20.

The timing controller 10 senses and senses a signal (voltage or current) including a threshold voltage (Vth) and mobility characteristics of each subpixel driving TFT (DT) or degradation characteristics of an OLED through the data driver 20 Compensation information for compensating video data is updated in real time using the obtained information.

The timing controller 10 determines the peak luminance according to image characteristic information such as an average picture level (APL) detected from the input image, and adjusts the gamma high potential power according to the determined peak luminance to adjust the gamma high potential Power may be supplied to the gamma voltage generator 40.

The gamma voltage generator 40 generates a gamma voltage set including a plurality of gamma voltages having different levels and supplies them to the data driver 20. The gamma voltage generator 40 divides the gamma high potential power through a resistance string to generate and output a gamma voltage set including a plurality of gamma voltages. The gamma voltage generator 40 may be built into the data driver 20.

The data driver 20 converts digital data from the timing controller 10 into analog data signals in response to a data control signal from the timing controller 10 and supplies them to a plurality of data lines of the display panel 50. At this time, the data driver 20 subdivides the gamma voltage set from the gamma voltage generator 40 into gray voltages corresponding to the gray level values of the data, and then converts the digital data into an analog data signal using the divided gray voltages. Convert to The data driver 20 is driven in a sensing mode for external compensation and a display mode for display driving under the control of the timing controller 10.

The data driver 20 is composed of at least one data drive IC and is mounted on a circuit film such as a tape carrier package (TCP), a chip on film (COF), a flexible print circuit (FPC), etc., and TAB on the display panel 50 It may be attached by a (Tape Automatic Bonding) method or mounted on a non-display area of the display panel 50 by a Chip On Glass (COG) method.

The gate driver 30 sequentially drives a plurality of gate lines of the display panel 50 in response to a gate control signal from the timing controller 10. In response to the gate control signal, the gate driver 30 supplies a scan pulse of a gate-on voltage to each gate line in a corresponding scan period, and supplies a gate-off voltage in the remaining period. The gate driver 30 may receive a gate control signal directly from the timing controller 10 or may receive a gate control signal from the timing controller 10 via the data driver 20.

The gate driver 30 is composed of at least one gate drive IC and is mounted on a circuit film such as TCP, COF, FPC, etc., and attached to the display panel 50 in a TAB method, or the display panel 50 is not displayed in a COG method. It can be mounted on the area. In contrast, the gate driver 30 is formed in the non-display area of the TFT substrate together with the TFT array formed in the pixel array of the display panel 50, thereby forming a GIP (Gate In Panel) type embedded in the display panel 50. Can be.

The display panel 50 includes a matrix-type pixel array. Each pixel of the pixel array implements a desired color by a combination of red (R), green (G), and blue (B) subpixels, and additionally includes a white (W) subpixel for improving luminance.

Each subpixel has an OLED element and a pixel circuit for driving the OLED element. The pixel circuit includes first and second switching TFTs ST1 and ST2, a driving TFT DT, and a storage capacitor Cst. In addition, the pixel circuit includes first and second gate lines GLn1 and GLn2 for controlling the first and second switching TFTs ST1 and ST2, respectively, and a data line for supplying a data signal to the first switching TFT ST1 ( DLm), a reference line RLm supplying a reference voltage Vref to the second switching TFT ST2, an ELVDD line supplying a high potential power supply ELVDD to the driving TFT DT, and the cathode of the OLED. It is connected to an ELVSS line that supplies a low-potential power supply (ELVSS).

The OLED is connected in series with the driving TFT (DT) between the ELVDD line and the ELVSS line. The OLED has an anode connected to the driving TFT (DT), a cathode connected to the ELVSS line, and a light emitting layer between the anode and the cathode. The emission layer includes an electron injection layer, an electron transport layer, an organic emission layer, a hole transport layer, and a hole injection layer sequentially stacked between the cathode and the anode. In OLED, when a positive bias is applied between the anode and the cathode, electrons from the cathode are supplied to the organic emission layer via the electron injection layer and the electron transport layer, and holes from the anode are supplied to the organic emission layer via the hole injection layer and the hole transport layer. do. Accordingly, in the organic emission layer, a fluorescent or phosphorescent material is emitted by recombination of supplied electrons and holes to generate light proportional to the amount of current.

The first switching TFT ST1 charges the storage capacitor Cst with a voltage corresponding to the data signal from the data line DL in response to the control of the first gate line GLn1. At this time, the second switching TFT ST2 supplies the reference voltage Vref from the reference line RLm to the connection node between the driving TFT DT and the OLED element in response to the control of the second gate line GLn2. . The driving TFT DT controls the amount of light emitted from the OLED device by controlling the current supplied to the OLED device according to the voltage charged in the storage capacitor Cst. Meanwhile, the second switching TFT ST2 may be used as a path for supplying the pixel current output according to the driving characteristic of the pixel circuit in the sensing mode to the reference line RLm.

In response to the control of the timing controller 10 in a sensing mode, for example, a blanking period of a vertical synchronization signal that is a non-display period, the data driver 20 supplies precharge data (precharge voltage) to the data line DLm Thus, a plurality of subpixels are driven. Subsequently, the data driver 20 senses (sampling and holds) a signal (voltage or current) including the characteristics of the driven subpixel through a sensing channel (DLm or RLm) to convert it into digital sensing data, and then converts the sensing data. Latch. In addition, the data driver 20 converts the sensing signals of the subpixels into digital sensing data, and then repeats the latching sequence during the blanking period to convert and latch sensing signals of a plurality of subpixels into sensing data during a limited blanking period.

Then, in the display period of the vertical synchronization signal, the data driver 20 drives the data lines DLm by using the video data transmitted from the timing controller 10. At this time, the data driver 20 transmits a plurality of latched sensing data to the timing controller 10.

The timing controller 10 updates the compensation information in real time by detecting and storing compensation information for compensating the characteristics of each subpixel using the sensing data transmitted from the data driver 20.

For example, the timing controller 10 calculates the pixel current by using the sensing data of each subpixel transmitted from the data driver 20, and calculates the threshold voltage (Vth) and the mobility (K factor) of the driving TFT (DT). ), the Vth component and the K factor component of each subpixel are sensed using a function that obtains the pixel current. The timing controller 10 updates the first compensation information by determining an offset value for compensating the Vth of each subpixel and storing it in a memory (not shown) as the first compensation information, and compensates the K factor of each subpixel. The second compensation information is updated by determining a gain value for and storing it in a memory (not shown) as the second compensation information. The first and second compensation information is stored in the memory in the form of a lookup table corresponding to each subpixel.

In addition to the blanking period of the vertical synchronization signal, the timing controller 10 drives the display panel 50 in the sensing mode before shipment of the display device, the boot time at power-on, or the end time at power-off through the data driver 20. By sensing the characteristics of each subpixel, compensation information can be generated or updated whenever necessary.

FIG. 2 is a block diagram showing an example of the internal configuration of the data driver shown in FIG. 1, and FIG. 2 shows an example in which output channels CH1 to CHn connected to a data line are used as a sensing channel.

The data driver 10 shown in FIG. 2 includes a shift register 21 and an input latch unit 22, and n digital-to-analog converters (hereinafter referred to as DACs) individually connected to n output channels CH1 to CHn. 23) and, n output buffers 24 individually connected between n DACs 23 and n output channels (CH1 to CHn), n output buffers 24 and n output channels (CH1 to CHn) It includes a driving unit including n switches SW that are individually connected between CHn).

In addition, the data driver 10 includes n sampling and holders (hereinafter S/H) 25 individually connected to n output channels (CH1 to CHn), n S/H circuits 25 and MUX/ A sensing unit including an analog-to-digital converter (hereinafter referred to as ADC) 27 connected through the scaler 26 and an output latch unit 28 connected to the ADC 27 is provided.

The shift register 21 outputs sequential sampling signals in response to a source shift clock from the timing controller 10 shown in FIG. 1.

The input latch unit 22 sequentially samples and latches the data VD from the timing controller 10 in response to the sequential sampling signal of the shift register 21, and then latches when data for one horizontal line is latched. Data is simultaneously output to n DACs 23.

The n DACs 23 convert data from the input latch unit 22 into data voltages using a plurality of gamma voltages (Vg), and n output channels through n output buffers 24 and switches (SW). A data voltage is supplied to each of (CH1 to CHn).

The n switches SW respectively supply the precharge voltage Vpre from the outside to the output channels CH1 to CHn during the precharge period in the sensing mode or the display mode. At this time, the n switches SW may be selectively switched in the sensing mode to select output channels CH1 to CHn to which the precharge voltage Vpre is supplied. That is, the n switches SW may selectively supply the precharge voltage Vpre to the output channels CH1 to CHn in the sensing mode. The n switches SW respectively supply the output voltage of the DAC 23 to the output channels CH1 to CHn in the display mode. Meanwhile, the precharge voltage Vpre may be supplied from the timing controller 30 through the latch unit 42 and the DAC 23.

The n S/Hs 25 sample and hold sensing signals respectively supplied through the output channels CH1 to CHn from the subpixels driven in the sensing mode.

The MUX/scaler 26 selects a sensing signal from n S/Hs 14, scales the selected sensing voltage to fit the driving range of the ADC 27, and outputs it to the ADC 27. The MUX/scaler 26 may be selected by grouping n sensing voltages by one or a plurality of them, which are variously determined by a designer.

The ADC 27 converts the sensing signal from the MUX/scaler 26 into digital sensing data SD and latches it in the output latch unit 28.

The MUX/scaler 26 and the ADC 27 select and scale the sensing signal from the S/H 14, convert it to sensing data SD, and latch it with the output latch unit 28. 28) is repeated N times as many as the number of latches L1 to LN. Meanwhile, operations of the S/H 14, MUX/scaler 26, and ADC 27 may be repeated N times.

The output latch unit 28 has N latches (L1 to LN) to sequentially latch the sensing data (SD) output from the ADC 27, and the N latches (L1 to LN) to N sensing data. When the latching is completed, the latched sensing data is transmitted to the timing controller 10 during the display period of the vertical synchronization signal.

A timing diagram illustrating an example of a sensing and transmission sequence of the data driver shown in FIG. 2. 3 is a flowchart illustrating step by step a method of compensating for real-time data of an OLED display device according to an exemplary embodiment of the present invention.

2 and 3, in step 2 (S2), the data driver 10 drives a subpixel with a precharge voltage Vpre in the blanking period of the vertical synchronization signal VSYNC, which is a sensing mode, and drives the subpixel. The S/H unit 25 samples and holds the sensing signal from the pixel to sense it.

In step 4 (S4), the sensing signals held by the MUX/scaler 26 and the ADC 27 are sequentially selected and converted into sensing data, and then a plurality of latches of the output latch unit 28 in step 6 (S6). It latches to (L1 to LN).

And, until the latch of the output latch unit 28 is completed in step 8 (S8), the MUX/scaler 26, the ADC 27, and the output latch unit 28 are processed in steps 4 (S4) to 8 (S8) is repeated N times to latch a plurality of sensing data into the output latch unit 28.

When the sensing data latch is completed in step 8 (S8), in step 10 (S10), the data driver 10 outputs in the display period of the vertical synchronization signal VSYNC, that is, the enable period of the data enable signal DE. The sensing data of the latch unit 28 is transmitted to the timing controller 10.

In step 12 (S12), the timing controller 10 updates the compensation information in real time by detecting and storing compensation information for compensating the characteristics of each subpixel using the sensing data transmitted from the data driver 20.

Meanwhile, the data driver 20 senses a sensing signal from a subpixel in the blanking period, converts the sensing signal to sensing data, and repeats a sequence of latching the sensing data to latch a plurality of sensing data into the output latch unit. I can.

5 is a block diagram illustrating an OLED display device according to another exemplary embodiment of the present invention.

When the OLED display device shown in FIG. 5 is compared with the OLED display device shown in FIG. 1, the data driver 20' does not include an output latch unit, and sensing data is transmitted between the data driver 20' and the timing controller 10. Since the remaining components are the same except that the memory 60 for temporary storage is additionally provided, a description of the same components as in FIG. 1 will be omitted.

The data driver 20' has a structure in which the output latch unit 28 is removed in FIG. 2. The data driver 20' stores sensing data sequentially output from the ADC 27 in the memory 60 during the blanking period of the vertical synchronization signal.

When the above-described sensing voltage selection, ADC, and sensing data storage sequence are repeated in the blanking period to complete the storage of sensing data in the memory 60, in the display period of the vertical synchronization signal, the memory 27 transfers the stored sensing data to the timing controller ( 10). The memory 60 may be mounted on the control board 70 together with the timing controller 10.

As described above, the OLED display data compensation method and apparatus according to the present invention senses and holds a sensing signal from a subpixel in a blanking period of a vertical synchronization signal, and then selectively converts the held voltage into sensing data and latches (stores) it. A sequence of repeating a sequence or sensing a sensing signal from a subpixel, converting it into sensing data, and repeating a sequence of latching By transmitting, it is possible to increase the number of subpixels to sense even within a limited blanking period.

Accordingly, the OLED display data compensation method and apparatus according to the present invention can reduce the time to update the compensation information by sensing the characteristics of all subpixels, and thus, there is an effect of increasing the real-time compensation speed even when the resolution is increased. .

Although shown and described as specific embodiments to illustrate the technical idea of the present invention, the present invention is not limited to the same configuration and operation as the specific embodiment as described above, and various modifications do not depart from the technical idea of the present invention. It can be implemented within a range. Therefore, such modifications should be regarded as belonging to the scope of the present invention, and the scope of the present invention should be determined by the claims to be described later.

10: timing controller 20, 20' data driver
30: gate driver 40: gamma voltage generator
50: display panel 60: memory
70: control board 21: shift register
22: input latch unit 23: DAC
24: output buffer 25: S/H
26: MUX/scaler 27: ADC
28: output latch part L1 to LN: latch

Claims (9)

During a sensing mode, the data driver receives precharge data from a timing controller and converts it to a precharge voltage, and supplies the converted precharge voltage to a data line of the display panel to drive a plurality of subpixels of the display panel. Wow;
Sensing and holding a sensing signal including characteristics of the driven plurality of subpixels by the data driver;
Selectively converting the sensed signal held by the data driver into sensed data and storing it in an output latch unit;
Storing a plurality of sensing data in the output latch unit by repeating the sequence of selecting the held sensing signal and converting and storing sensing data in the data driver;
Transmitting the stored sensing data from the data driver to a timing controller;
And updating compensation information stored in a memory by processing sensing data transmitted from the data driver in the timing controller. During a sensing mode, the data driver receives precharge data from a timing controller and converts it to a precharge voltage, and supplies the converted precharge voltage to a data line of the display panel to drive a plurality of subpixels of the display panel. Wow;
Sensing a sensing signal including characteristics of the driven plurality of subpixels by the data driver, converting the sensing signal into sensing data, and storing it in a memory;
Storing a plurality of sensing data in the memory by repeating a sequence of sensing the sensing signal and converting and storing the sensing data in the data driver;
Transmitting sensing data stored in the memory to a timing controller;
And updating compensation information stored in another memory by processing the sensing data transmitted from the memory by the timing controller. The method according to claim 1 or 2,
The sensing mode is included in at least one of a boot time at power-on, a vertical blank period of a vertical synchronization signal, and an end time at power off,
When the sensing mode is included in the vertical blank period of the vertical synchronization signal, the sensing data sensed and stored from the plurality of subpixels during the vertical blank period is the timing in a display period following the vertical blank period of the vertical synchronization signal. Data compensation method of OLED display device transmitted to controller. A display panel in which each of pixels constituting the pixel array includes a plurality of subpixels;
A data driver for driving the subpixel through a driving channel, sensing a sensing signal including characteristics of the subpixel through a sensing channel, converting the sensing signal into sensing data, and outputting the sensing data;
A timing controller for controlling driving of the data driver and processing sensing data transmitted from the data driver to compensate for data to be supplied to the data driver;
During the sensing mode, the data driver
Through the driving channel, precharge data is supplied from the timing controller and converted into a precharge voltage, and the converted precharge voltage is supplied to a data line of the display panel to drive a plurality of subpixels of the display panel. ,
Through the sensing channel, sensing signals including characteristics of the plurality of driven subpixels are sensed, sampled and held, and the held sensing signal is selectively converted into sensing data and stored, and the sensing signal is selectively sensed. It stores a number of sensing data by repeating the sequence of data conversion and storing in the internal or external memory,
The sensing data stored in the internal or external memory is transmitted to a timing controller,
The timing controller processes the transmitted sensing data to update compensation information stored in another memory, and compensates the data to be supplied to the data driver by using the updated compensation information. The method of claim 4,
The data driver is
A driving unit for driving the driving channel and a sensing unit connected to the sensing channel;
The sensing unit
A plurality of sampling and holders for sampling and holding a sensing signal individually supplied from the plurality of subpixels through the sensing channel;
A multiplexer/scaler that selectively scales and outputs sensing signals from the plurality of sampling and holders;
An analog-to-digital converter (hereinafter referred to as ADC) converting and outputting the sensing signal from the multiplexer into the sensing data;
A data compensating device for an OLED display device including an output latch unit that is the internal memory that sequentially stores sensing data from the ADC and then transmits the stored sensing data to the timing controller. The method of claim 4,
The data driver is
A driving unit for driving the driving channel and a sensing unit connected to the sensing channel;
The sensing unit
A plurality of sampling and holders for sampling and holding a sensing signal individually supplied from the plurality of subpixels through the sensing channel;
A multiplexer/scaler that selectively scales and outputs sensing signals from the plurality of sampling and holders;
And an ADC for converting and outputting the sensing signal from the multiplexer into the sensing data,
The external memory connected between the data driver and the timing controller sequentially stores sensing data from the ADC and then transmits a plurality of stored sensing data to the timing controller. The method according to claim 5 or 6,
The multiplexer/scaler and the ADC, and the internal memory or the external memory repeats the operation of the sensing mode until the plurality of sensing data is stored. The method of claim 4,
The driving channel and the sensing channel are data lines of the display panel; The driving channel is a reference line and the data line, and the sensing channel is the reference line. The method of claim 4,
The sensing mode is included in at least one of a boot time at power-on, a vertical blank period of a vertical synchronization signal, and an end time at power off,
When the sensing mode is included in the vertical blank period of the vertical synchronization signal, the sensing data sensed and stored from the plurality of subpixels during the vertical blank period is the timing in a display period following the vertical blank period of the vertical synchronization signal. Data compensation device of OLED display device transmitted to controller.

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