KR102417990B1 - Organic light emitting display device and method for driving the organic light emitting display device - Google Patents

Abstract

Embodiments relate to an organic light emitting display device and a driving method thereof, and when the organic light emitting display device is powered on, a plurality of initial compensation data is used to collectively compensate different characteristics of a plurality of sub-pixels in a memory unit Thus, the integrated initial compensation data obtained and stored in advance may be received, and compensation data for at least one sub-pixel may be calculated. Therefore, it is possible to improve the user responsiveness by reducing the time the initial image is displayed after power-on.

Description

Organic light emitting display device and driving method thereof

The present invention relates to an organic light emitting display device and a driving method thereof.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Various display devices such as an organic light emitting display device (OLED) are being used.

The organic light emitting display device, which has recently been in the spotlight, uses an organic light emitting diode (OLED) that emits light by itself, and thus has a fast response speed, and has a large contrast ratio, luminous efficiency, luminance, and viewing angle.

Each sub-pixel disposed in the organic light emitting display panel of the organic light emitting display device basically includes a driving transistor for driving the organic light emitting diode, a switching transistor for transferring a data voltage to the gate node of the driving transistor, and a constant voltage for one frame time. It may be configured to include a capacitor that serves to maintain the.

Meanwhile, the driving transistor in each subpixel has characteristic values such as threshold voltage and mobility, and these characteristic values may be different for each driving transistor due to manufacturing tolerances and the like.

In addition, as the driving time increases, the driving transistor may be degraded and thus a characteristic value may be changed. According to the difference in the degree of deterioration of the driving transistors, a characteristic value deviation between the driving transistors may occur.

The organic light emitting diodes in each sub-pixel may also have manufacturing tolerances, and deterioration proceeds with an increase in driving time, so characteristic values such as threshold voltage may change, and the degree of deterioration between the organic light emitting diodes may be different. A characteristic value deviation between organic light emitting diodes within a pixel may occur.

The deviation of the characteristic value between the sub-pixels caused by the deviation of the characteristic value between the driving transistors and the deviation of the characteristic value between the organic light emitting diodes causes the luminance deviation between the sub-pixels to cause screen abnormalities such as screen afterimage or the luminance unevenness of the display panel. can

Accordingly, a technique for compensating for the characteristic value deviation between sub-pixels has been proposed. In the compensation method, initial compensation data obtained by measuring the characteristic value deviation between sub-pixels in advance during manufacturing is stored in a memory, and data to be applied to the sub-pixels is compensated using the initial compensation data stored in the memory. In order to compensate for variation in characteristic values between sub-pixels caused by an increase in , and a surrounding environment, the organic light-emitting display device is sensed and driven to sense the characteristic values of the driving transistors or organic light-emitting diodes of the sub-pixels to obtain sensed data, and then A method of compensating the data to be applied to the sub-pixels based on the data is being used.

However, as the resolution of the organic light emitting diode display increases, the number of driving transistors increases, and thus the time required to compensate for the characteristic value deviation between sub-pixels increases.

An object of the embodiments is to reduce a compensation time performed when an organic light emitting diode display is powered on.

An object of the embodiments is to provide an organic light emitting display device more convenient to a user by reducing a user response time from generation of a power-on signal until an image is displayed.

An object of the embodiments is to reduce a time required for an organic light emitting diode display to display an image by reducing a time for loading compensation data for compensating for a characteristic value deviation between sub-pixels when power is turned on.

An object of the embodiments is to reduce a time required for an organic light emitting diode display to display an image by reducing a time for loading compensation data for compensating for a characteristic value deviation between sub-pixels when power is turned on.

This is to prevent the organic light emitting diode display from increasing the time it takes to display an image even when compensation data for compensating for a characteristic value deviation between sub-pixels is transmitted at a slow transmission rate during power-on.

An object of the embodiments is to improve convenience in a manufacturing process, thereby shortening manufacturing time and reducing manufacturing cost.

In one aspect, embodiments provide a display panel in which a plurality of sub-pixels defined by a plurality of gate lines and a plurality of data lines are arranged and a sensing voltage from the display panel is measured to be applied to at least one sub-pixel of the plurality of sub-pixels. It is possible to provide an organic light emitting display device including a sensing unit for outputting sensed data.

In such an organic light emitting display device, an integrated initial obtained by using a plurality of initial compensation data for compensating for different characteristics of a plurality of sub-pixels and a plurality of initial compensation data for collectively compensating for different characteristics of a plurality of sub-pixels. The controller may further include a memory unit storing compensation data in advance and a compensation unit configured to receive the integrated initial compensation data when a power-on signal is generated and calculate compensation data for at least one sub-pixel.

When a power-off signal is generated, the compensation unit may receive a plurality of initial compensation data stored in the memory unit, update the plurality of initial compensation data using the sensing data, and store the updated initial compensation data in the memory unit. .

The compensation unit may update the integrated initial compensation data using the updated initial compensation data, and store the updated integrated initial compensation data in the memory unit.

The compensation unit may store the plurality of initial compensation data and the integrated initial compensation data separately in different designated areas of the memory unit.

Here, the plurality of initial compensation data may include intrinsic compensation data for compensating for unique characteristics generated during manufacturing among the characteristics of sub-pixels, and environmental compensation data for compensating for a characteristic variation according to the usage environment of the organic light emitting display device. have.

The compensator may update environmental compensation data among a plurality of initial compensation data when a power-off signal is generated.

The compensator may receive a plurality of initial compensation data for the sub-pixel selected thereafter, while receiving and updating the plurality of initial compensation data for the sub-pixel selected from among the plurality of sub-pixels according to a predetermined order.

The organic light emitting diode display may further include a gate driver for driving the plurality of gate lines under the control of the controller and a data driver for driving the plurality of data lines by supplying image data under the control of the controller.

The memory unit may be mounted on a source printed circuit board for electrically connecting the data driver to a controller mounted on the control printed circuit board.

The control printed circuit board may be electrically connected to the source printed circuit board through a flexible printed circuit (FPC) or a flexible flat cable (FFC).

The memory unit includes at least one non-volatile memory, and the at least one non-volatile memory may be an eMMC (Embedded MultiMediaCard) or a NAND flash memory.

The memory unit may transmit/receive data to and from the compensator in a single data rate mode (SDR mode).

In another aspect, embodiments provide for collectively compensating for different characteristics of a plurality of sub-pixels and a plurality of initial compensation data for compensating for different characteristics of a plurality of sub-pixels stored in advance in the memory unit when a power-on signal is generated. receiving integrated initial compensation data from among the integrated initial compensation data for calculating compensation data for at least one sub-pixel; receiving a plurality of initial compensation data stored in the memory unit when a power-off signal is generated; and sensing data updating a plurality of initial compensation data using It is possible to provide a method of driving an organic light emitting display device including the step of storing in the unit.

According to the embodiments described above, it is possible to provide a more convenient organic light emitting display device to a user by reducing a user response time after the power-on signal is generated.

According to exemplary embodiments, the time required for the organic light emitting diode display to display an image may be reduced by reducing a time for loading compensation data for compensating for a characteristic value deviation between sub-pixels during power-on.

According to embodiments, even when compensation data for compensating for a characteristic value deviation between sub-pixels is transmitted at a slow transmission rate when the power is turned on, the time required for the organic light emitting diode display to display an image may be maintained or reduced.

According to the embodiments, it is possible to improve the convenience in the manufacturing process, thereby shortening the manufacturing time and reducing the manufacturing cost.

1 is a schematic system configuration diagram of an organic light emitting diode display according to example embodiments.
2 is an exemplary diagram of a sub-pixel structure of an organic light emitting diode display according to example embodiments.
3 is an exemplary diagram of a compensation circuit of an organic light emitting diode display according to example embodiments.
4 is a diagram for describing a threshold voltage sensing driving method for a driving transistor of an organic light emitting diode display according to example embodiments.
5 is a diagram for describing a mobility sensing driving method for a driving transistor of an organic light emitting diode display according to example embodiments.
6 is a diagram illustrating a sensing timing of an organic light emitting diode display according to example embodiments.
7 illustrates compensation data transmitted between a compensation unit and a memory unit according to embodiments.
8 is an exemplary diagram illustrating a system implementation of an organic light emitting diode display according to example embodiments.
9 is a diagram illustrating another system implementation of an organic light emitting diode display according to example embodiments.
10 illustrates compensation data transmitted between a compensation unit and a memory unit according to other exemplary embodiments.
11 illustrates a method of driving an organic light emitting diode display according to example 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, if 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 an organic light emitting display device 100 according to example embodiments.

Referring to FIG. 1 , in the organic light emitting diode display 100 according to the exemplary embodiment, a plurality of data lines DL and a plurality of gate lines GL are disposed, and a plurality of data lines DL and a plurality of gates are disposed. The organic light emitting display panel 110 in which a plurality of sub pixels (SP) defined by the lines GL are arranged, the data driver 120 driving the plurality of data lines DL, and a plurality of gates It includes a gate driver 130 for driving the line GL, a data driver 120 , and a controller 140 for controlling the gate driver 130 .

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, 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, , to 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. In the present invention, the controller 140 may include a compensator that performs a compensation process for compensating for a characteristic value deviation between sub-pixels.

The controller 140 may be implemented as a separate component from the data driver 120 , or may be implemented as an integrated circuit together with the data driver 120 .

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

The data driver 120 may include at least one source driver integrated circuit (SDIC) to drive a plurality of data lines.

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

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

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

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

The gate driver 130 sequentially supplies a scan signal of an on voltage or an off voltage to the plurality of gate lines GL 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 DL.

As shown in FIG. 1 , the data driver 120 may be positioned on only one side (eg, upper or lower side) of the organic light emitting display panel 110 , and in some cases, the organic light emitting diode display may be configured according to a driving method or a panel design method. It may be located on both sides (eg, upper and lower sides) of the display panel 110 .

As shown in FIG. 1 , the gate driver 130 may be located only on one side (eg, left or right) of the organic light emitting display panel 110 , and in some cases, an organic light emitting device according to a driving method, a panel design method, etc. It may be located on both sides (eg, left and right) of the light emitting display panel 110 .

The above-described controller 140 includes, 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), and the like. Timing signals are received from the outside (eg host system).

The controller 140 receives timing signals such as a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), an input DE signal, and a clock signal to control the data driver 120 and the gate driver 130, Various control signals are generated and output to the data driver 120 and the gate driver 130 .

For example, in order to control the gate driver 130 , the controller 140 includes 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 .

Each sub-pixel SP arranged in the organic light emitting display panel 110 includes an organic light emitting diode (OLED) which is a self-emissive element, and a driving transistor for driving the organic light emitting diode (OLED). It is composed of circuit elements such as

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.

2 is an exemplary diagram of a sub-pixel structure of an organic light emitting diode display 100 according to example embodiments.

Referring to FIG. 2 , in the organic light emitting diode display 100 according to the exemplary embodiment, each sub-pixel SP basically includes an organic light emitting diode (OLED) and a driving transistor for driving the organic light emitting diode (OLED). A driving transistor (DRT), a first transistor T1 for transferring a data voltage to a first node N1 corresponding to a gate node of the driving transistor DRT, and a data voltage corresponding to an image signal voltage or It may be configured to include a storage capacitor (Cst: Storage Capacitor) that maintains the corresponding voltage for one frame time.

An organic light emitting diode (OLED) may include a first electrode (eg, an anode electrode or a cathode electrode), an organic layer, and a second electrode (eg, a cathode electrode or an anode electrode).

A ground voltage EVSS may be applied to the second electrode of the organic light emitting diode OLED.

The driving transistor DRT drives the organic light emitting diode (OLED) by supplying a driving current to the organic light emitting diode (OLED).

The driving transistor DRT has a first node N1 , a second node N2 , and a third node N3 .

The first node N1 of the driving transistor DRT is a node corresponding to a gate node and may be electrically connected to a source node or a drain node of the first transistor T1 .

The second node N2 of the driving transistor DRT may be electrically connected to the first electrode of the organic light emitting diode OLED, and may be a source node or a drain node.

The third node N3 of the driving transistor DRT is a node to which the driving voltage EVDD is applied, and may be electrically connected to a driving voltage line DVL supplying the driving voltage EVDD, and has a drain. It can be a node or a source node.

The driving transistor DRT and the first transistor T1 may be implemented as an n-type or a p-type as in the example of FIG. 2 .

The first transistor T1 may be electrically connected between the data line DL and the first node N1 of the driving transistor DRT, and may be controlled by receiving the scan signal SCAN through the gate line as the gate node. have.

The first transistor T1 is turned on by the scan signal SCAN to transfer the data voltage Vdata supplied from the data line DL to the first node N1 of the driving transistor DRT. .

The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

This storage capacitor Cst is not a parasitic capacitor (eg, Cgs, Cgd) which is an internal capacitor existing between the first node N1 and the second node N2 of the driving transistor DRT, It is an external capacitor intentionally designed outside the driving transistor (DRT).

Meanwhile, in the case of the organic light emitting diode display 100 according to the embodiments, as the driving time of each subpixel SP increases, circuit elements such as the organic light emitting diode OLED and the driving transistor DRT are deteriorated. (Degradation) may proceed.

Accordingly, unique characteristic values of circuit elements such as organic light emitting diodes (OLED) and driving transistors (DRT) may change. Here, the intrinsic characteristic value of the circuit element may include a threshold voltage of the organic light emitting diode (OLED), a threshold voltage of the driving transistor (DRT), mobility of the driving transistor (DRT), and the like.

A change in a characteristic value of a circuit element may cause a change in luminance of a corresponding sub-pixel. Accordingly, the change in the characteristic value of the circuit element can be used in the same concept as the change in the luminance of the sub-pixel.

In addition, the degree of change in the characteristic value between the circuit elements may be different from each other according to the difference in the degree of deterioration of each circuit element.

The difference in the degree of change in the characteristic value between the circuit elements may cause a deviation in the characteristic value between the circuit elements, which may cause a luminance deviation between sub-pixels. Accordingly, the characteristic value deviation between circuit elements may be used as the same concept as the luminance deviation between sub-pixels.

Changes in the characteristic values of circuit elements (change in sub-pixel luminance) and deviations in characteristic values between circuit elements (luminance deviation between sub-pixels) cause problems such as lowering the accuracy of sub-pixel luminance expression or causing screen abnormalities. can do it

The organic light emitting diode display 100 according to the exemplary embodiment may provide a sensing function for sensing a characteristic value of a sub-pixel and a compensation function for compensating for a characteristic value of the sub-pixel by using the sensing result.

In the present specification, sensing the characteristic value of the sub-pixel means sensing a characteristic value or a characteristic value change of a circuit element (driving transistor (DRT), organic light emitting diode (OLED)) in the sub-pixel, or a circuit element (driving transistor ( DRT) and organic light emitting diode (OLED)) may mean sensing a characteristic value deviation.

In the present specification, compensating for a characteristic value of a sub-pixel means making a characteristic value or a characteristic value change of a circuit element (a driving transistor (DRT), an organic light emitting diode (OLED)) within the sub-pixel to a predetermined level, or making a circuit element (driving It may mean reducing or eliminating the characteristic value deviation between the transistor (DRT) and the organic light emitting diode (OLED).

In order to provide a sensing function and a compensation function, the organic light emitting display device 100 according to the exemplary embodiment may include a subpixel structure suitable therefor, and a compensation circuit including a sensing and compensation configuration.

As shown in FIG. 2 , each subpixel disposed on the organic light emitting display panel 110 may further include a second transistor T2 to provide a sensing function and a compensation function.

Referring to FIG. 2 , the second transistor T2 is electrically connected between the second node N2 of the driving transistor DRT and a reference voltage line (RVL) supplying a reference voltage (Vref). , and may be controlled by receiving a sensing signal SENSE, which is a type of scan signal, as a gate node.

By further including the above-described second transistor T2 , the voltage state of the second node N2 of the driving transistor DRT in the subpixel SP may be effectively controlled.

The second transistor T2 is turned on by the sensing signal SENSE and applies the reference voltage Vref supplied through the reference voltage line RVL to the second node N2 of the driving transistor DRT. .

Also, the second transistor T2 may be used as one of the voltage sensing paths for the second node N2 of the driving transistor DRT.

Meanwhile, the scan signal SCAN and the sensing signal SENSE may be separate gate signals. In this case, the scan signal SCAN and the sensing signal SENSE may be respectively applied to the gate node of the first transistor T1 and the gate node of the second transistor T2 through different gate lines.

In some cases, the scan signal SCAN and the sensing signal SENSE may be the same gate signal. In this case, the scan signal SCAN and the sensing signal SENSE may be commonly applied to the gate node of the first transistor T1 and the gate node of the second transistor T2 through the same gate line.

3 is an exemplary diagram of a compensation circuit of the organic light emitting diode display 100 according to example embodiments.

Referring to FIG. 3 , the organic light emitting diode display 100 according to the embodiments uses a sensing unit 310 that generates and outputs sensed data through voltage sensing in order to identify characteristic values of sub-pixels, and the sensed data. In this way, the compensator 320 and preset initial compensation data (or initial compensation value) and the compensator 320 perform a compensation process for compensating for the characteristic values of the sub-pixels based on the identification of the characteristic values of the sub-pixels. It may include a memory unit 330 for storing the calculated compensation data, and the like.

For example, the sensing unit 310 may be implemented to include at least one analog to digital converter (ADC). The sensing data output from the sensing unit 310 may be, for example, in a low voltage differential signaling (LVDS) data format.

Each analog to digital converter (ADC) may be included in each source driver integrated circuit SDIC included in the data driver 120 , and in some cases, external to the source driver integrated circuit SDIC. may be included in

The compensator 320 may be included in the controller 140 , and in some cases, may be provided outside the controller 140 . The compensation unit 320 may also be referred to as a compensation processor.

The memory unit 330 may store a plurality of preset initial compensation data ICD. Here, the plurality of initial compensation data is compensation data for compensating for different characteristics of the plurality of sub-pixels, and the initial compensation data and organic data for compensating for deviation according to the unique characteristics of the plurality of sub-pixels SP generated during manufacturing Initial compensation data for compensating for a characteristic variation variable according to the usage environment of the light emitting display device 100 may be included.

Initial compensation data ICD for compensating for deviations due to intrinsic characteristics of the plurality of sub-pixels SP is referred to as intrinsic compensation data CCD, and the amount of characteristic change that varies according to the usage environment of the organic light emitting display device 100 is The initial compensation data ICD for compensation may be referred to as environmental compensation data ECD.

Here, the intrinsic compensation data CCD may have a fixed value regardless of the use state of the organic light emitting diode display 100 .

Also, the memory unit 330 may store the sensing data applied from the sensing unit 310 or the compensation data calculated by the compensating unit 320 as environmental compensation data (ECD). When a power off signal of the organic light emitting display device 100 is generated, the memory unit 330 is disposed on the display panel 110 before an off-sequence such as power off is performed. A characteristic value of the driving transistor DRT in each sub-pixel may be sensed, and the sensed data or the calculated compensation data may be stored as the environmental compensation data ECD. In this case, the environmental compensation data ECD may be used as the initial compensation data ICD when the organic light emitting diode display 100 is driven.

Here, the memory unit 330 may include at least one non-volatile memory, and the at least one non-volatile memory may be an eMMC (Embedded MultiMediaCard) or a NAND flash memory.

The memory unit 330 may be included outside the controller 140 , and in some cases, may be included inside the controller 140 . Also, the memory unit 330 may be included inside or outside the source driver integrated circuit SDIC.

Although not shown, the compensator 320 may include a memory separate from the memory unit 330 . The compensator 320 further includes a volatile memory for temporarily storing image data applied from a host device (not shown) while driving the display panel 110 or changed data obtained by changing the image data into the calculated compensation data. can do.

In addition, the volatile memory may sense the characteristic value of the driving transistor DRT in each subpixel disposed on the display panel 110 and store the sensing data SD or the calculated compensation data CD.

Here, the volatile memory may be included outside the compensation unit 320 .

Referring to FIG. 3 , the organic light emitting diode display 100 according to the embodiments includes an initialization switch SPRE that controls whether a reference voltage Vref is applied to a reference voltage line RVL, and a reference voltage line ( RVL) and the sensing unit 310 may include a sampling switch (SAM) for controlling whether to connect.

The initialization switch SPRE is configured such that the second node N2 of the driving transistor DRT in the subpixel SP enters a voltage state that reflects a desired characteristic value of the circuit element. ) is a switch to control the voltage application state.

When the initialization switch SPRE is turned on, the reference voltage Vref is supplied to the reference voltage line RVL through the turned-on second transistor T2 to the second node N2 of the driving transistor DRT. ) can be approved.

The sampling switch SAM is turned on to electrically connect the reference voltage line RVL and the sensing unit 310 .

The sampling switch SAM has an on-off timing such that it is turned on when the second node N2 of the driving transistor DRT in the subpixel SP reaches a voltage state that reflects the desired characteristic value of the circuit element. Controlled.

When the sampling switch SAM is turned on, the sensing unit 310 may sense the voltage of the connected reference voltage line RVL.

When the sensing unit 310 senses the voltage of the reference voltage line RVL, if the second transistor T2 is turned on and the resistance component of the driving transistor DRT can be ignored, the sensing unit 310 ) may correspond to the voltage of the second node N2 of the driving transistor DRT. The voltage sensed by the sensing unit 310 may be the voltage of the reference voltage line RVL, that is, the voltage of the second node N2 of the driving transistor DRT.

If a line capacitor is present on the reference voltage line RVL, the voltage sensed by the sensing unit 310 may be a voltage charged in the line capacitor on the reference voltage line RVL. Here, the reference voltage line RVL is also referred to as a sensing line.

For example, the voltage sensed by the sensing unit 310 is a voltage value Vdata-Vth or Vdata-ΔVth including a threshold voltage Vth or a threshold voltage deviation ΔVth of the driving transistor DRT, where Vdata is a sensing driving data voltage) or a voltage value for sensing the mobility of the driving transistor DRT.

Meanwhile, as an example, one reference voltage line RVL may be disposed in each subpixel column, or may be disposed in each of two or more subpixel columns.

For example, if one pixel consists of 4 sub-pixels (red sub-pixel, white sub-pixel, green sub-pixel, and blue sub-pixel), the reference voltage line RVL has 4 sub-pixel columns (red sub-pixel column). , one for each pixel column including a white subpixel column, a green subpixel column, and a blue subpixel column).

Hereinafter, threshold voltage sensing driving and mobility sensing driving of the driving transistor DRT will be briefly described.

4 is a diagram for explaining a threshold voltage sensing driving method for a driving transistor DRT of the organic light emitting diode display 100 according to example embodiments.

The threshold voltage sensing driving of the driving transistor DRT may be performed through a sensing process including an initialization step, a tracking step, and a sampling step.

The initialization step is a step of initializing the first node N1 and the second node N2 of the driving transistor DRT.

In this initialization step, the first transistor T1 and the second transistor T2 are turned on, and the initialization switch SPRE is turned on.

Accordingly, each of the first node N1 and the second node N2 of the driving transistor DRT is initialized to the threshold voltage sensing driving data voltage Vdata and the reference voltage Vref (V1 = Vdata, V2). =Vref).

In the tracking step, the voltage V2 of the second node N2 of the driving transistor DRT is reached until the voltage of the second node N2 of the driving transistor DRT reaches a threshold voltage or a voltage state reflecting the change thereof. is a step to change

That is, the tracking step is a step of tracking the voltage of the second node N2 of the driving transistor DRT capable of reflecting the threshold voltage or its change.

In this tracking step, the initialization switch SPRE is turned off or the second transistor T2 is turned off, so that the second node N2 of the driving transistor DRT is floated.

Accordingly, the voltage V2 of the second node N2 of the driving transistor DRT increases.

The voltage V2 of the second node N2 of the driving transistor DRT rises and then gradually decreases and becomes saturated.

The saturated voltage of the second node N2 of the driving transistor DRT may correspond to the difference between the data voltage Vdata and the threshold voltage Vth or the difference between the data voltage Vdata and the threshold voltage deviation ΔVth. .

When the voltage V2 of the second node N2 of the driving transistor DRT is saturated, a sampling operation may be performed.

The sampling step is a step of measuring the threshold voltage of the driving transistor DRT or a voltage reflecting the change thereof, and the sensing unit 310 detects the voltage of the reference voltage line RVL, that is, the second voltage of the driving transistor DRT. This is a step of sensing the voltage of the node N2.

In this sampling step, the sampling switch SAM is turned on, and the sensing unit 310 is connected to the reference voltage line RVL, and the voltage of the reference voltage line RVL, that is, the second voltage of the driving transistor DRT. The voltage V2 of the second node N2 is sensed.

The voltage Vsen sensed by the sensing unit 310 is a voltage Vdata-Vth obtained by subtracting the threshold voltage Vth from the data voltage Vdata or a voltage obtained by subtracting the threshold voltage deviation ΔVth from the data voltage Vdata ( Vdata-ΔVth). Here, Vth may be a positive threshold voltage or a negative threshold voltage.

5 is a diagram for explaining a mobility sensing driving method for a driving transistor DRT of the organic light emitting diode display 100 according to exemplary embodiments.

The mobility sensing driving of the driving transistor DRT may be performed through a sensing process including an initialization step, a tracking step, and a sampling step.

The initialization step is a step of initializing the first node N1 and the second node N2 of the driving transistor DRT.

In this initialization step, the first transistor T1 and the second transistor T2 are turned on, and the initialization switch SPRE is turned on.

Accordingly, each of the first node N1 and the second node N2 of the driving transistor DRT is initialized to the mobility sensing driving data voltage Vdata and the reference voltage Vref (V1 = Vdata, V2 = Vref).

In the tracking step, the voltage V2 of the second node N2 of the driving transistor DRT is reached until the voltage of the second node N2 of the driving transistor DRT becomes a voltage state reflecting the mobility or its change. is a step to change

That is, the tracking step is a step of tracking the voltage of the second node N2 of the driving transistor DRT that can reflect mobility or its change.

In this tracking step, the initialization switch SPRE is turned off or the second transistor T2 is turned off, so that the second node N2 of the driving transistor DRT is floated. At this time, the first transistor T1 may be turned off, and the first node N1 of the driving transistor DRT may also be floated.

Accordingly, the voltage V2 of the second node N2 of the driving transistor DRT starts to rise.

A rising speed of the voltage V2 of the second node N2 of the driving transistor DRT depends on the current capability (ie, mobility) of the driving transistor DRT.

As the driving transistor DRT has a large current capability (mobility), the voltage V2 at the second node N2 of the driving transistor DRT rises more steeply.

After the tracking step is performed for a predetermined time Δt, that is, after the voltage V2 of the second node N2 of the driving transistor DRT rises for a predetermined predetermined time Δt, the sampling step may be performed.

During the tracking step, the rising speed of the voltage V2 of the second node N2 of the driving transistor DRT corresponds to the voltage change amount ΔV for a predetermined time Δt.

In the sampling step, the sampling switch SAM is turned on, and the sensing unit 310 and the reference voltage line RVL are electrically connected.

Accordingly, the sensing unit 310 senses the voltage of the reference voltage line RVL, that is, the voltage V2 of the second node N2 of the driving transistor DRT.

The voltage Vsen sensed by the sensing unit 310 is a voltage that is increased by the voltage change amount ΔV for a predetermined time Δt from the initialization voltage Vref, and is a voltage corresponding to mobility.

According to the threshold voltage or mobility sensing driving as described above with reference to FIGS. 4 and 5 , the sensing unit 310 converts the sensed voltage Vsen for threshold voltage sensing or mobility sensing into a digital value, and converts The sensed data including the digital value (sensed value) is generated and output.

The sensing data output from the sensing unit 310 may be provided to the compensating unit 320 . In some cases, the sensed data may be provided to the compensation unit 320 through the memory unit 330 .

The compensator 320 is configured to change a characteristic value (eg, a threshold voltage, mobility) of the driving transistor DRT or a change in a characteristic value (eg, a threshold) of the driving transistor DRT within the corresponding sub-pixel based on the sensing data provided by the sensing unit 310 . voltage change, mobility change), and a characteristic value compensation process can be performed.

Here, the change in the characteristic value of the driving transistor DRT may mean that the current sensed data is changed based on the previous sensed data or that the current sensed data is changed based on the initial compensation data.

Accordingly, by comparing the characteristic value or the characteristic value change between the driving transistors DRT, the characteristic value deviation between the driving transistors DRT can be grasped. When the characteristic value change of the driving transistor DRT means that the current sensed data is changed based on the initial compensation data, the characteristic value deviation between the driving transistors DRT from the characteristic value change of the driving transistor DRT (ie, sub-pixel luminance deviation) can also figure out

Here, the initial compensation data may be initial setting data set and stored during manufacturing of the organic light emitting display device.

The characteristic value compensation process may include a threshold voltage compensation process for compensating for a threshold voltage of the driving transistor DRT and a mobility compensation process for compensating for mobility of the driving transistor DRT.

The threshold voltage compensation process calculates compensation data for compensating for a threshold voltage or a threshold voltage deviation (threshold voltage change), and stores the calculated compensation data in the memory unit 330 , or uses the calculated compensation data as the image data (Data ) may include processing to change the

The mobility compensation process calculates compensation data for compensating for mobility or mobility deviation (mobility change), and stores the calculated compensation data in the memory unit 330, or uses the calculated compensation data as the corresponding image data (Data ) may include processing to change the

The compensator 320 may change the image data through threshold voltage compensation processing or mobility compensation processing and supply the changed data to the corresponding source driver integrated circuit SDIC in the data driver 120 .

For example, the compensation unit 320 may generate the pre-compensation data pre_CD as shown in Equation 1 by using the unique compensation data CCD among the initial compensation data ICD stored in the memory unit 330 .

Here, α and Φ are electron mobility and threshold voltage of the driving transistor DRT, respectively, and Vgs is the gate-source voltage of the driving transistor.

In addition, the compensator 320 includes a lookup table (LUT) for compensating for a luminance variation according to the driving time of the organic light emitting display device among the environmental compensation data ECD included in the environmental compensation data ECD among the initial compensation data ICD. The compensation data CD can be generated as in Equation 2 by reflecting the additional variation ΔΦ of the voltage in the pre-compensation data pre_CD using .

Here, the initial threshold voltage threshold voltage Φinit set by the lookup table LUT and the updated additional compensation value ΔΦ may be expressed by Equation (3).

Here, max_range is the maximum value of sensing data (1023 in case of 10-bit driving), and sensing_data is the threshold voltage (Φ) value included in the input sensing data. Φmin may be set to 4 as an example by an experimental value as the minimum value of the sensed data. In addition, RT_ref may be set to about 500, which is an approximate intermediate value as a standard sensing data value.

Accordingly, the source driver integrated circuit SDIC converts the data changed by the compensator 320 into a data voltage through a digital-to-analog converter (DAC) and supplies it to the corresponding sub-pixel, so that the sub-pixel characteristic value Compensation (threshold voltage compensation, mobility compensation) is actually performed.

Equations 1 to 3 for obtaining the compensation data CD are examples, and a method of obtaining the compensation data CD may be variously changed according to characteristics of the organic light emitting display device 100 .

As such sub-pixel characteristic value compensation is performed, image quality can be improved by reducing or preventing a luminance deviation between sub-pixels.

Here, when one reference voltage line RVL is disposed in each sub-pixel column, the sensing unit 310 may control a driving transistor of a specific sub-pixel in each of a plurality of pixels on the gate line GL driven by the scan signal SCAN. The voltage V2 of the second node N2 of the DRT is sensed.

For example, when one pixel includes four sub-pixels (a red sub-pixel, a white sub-pixel, a green sub-pixel, and a blue sub-pixel), the sensing unit 310 may generate a gate line driven by the scan signal SCAN. The voltage V2 of the second node N2 of the driving transistors DRT of the plurality of red sub-pixels may be applied through the reference voltage line RVL according to a specified order on the GL and may be sensed. Then, the voltage V2 of the second node N2 of the driving transistor DRT of the white subpixel, the green subpixel, and the blue subpixel may be sequentially applied through the reference voltage line RVL to be sensed.

However, if four reference voltage lines RVL are arranged in each sub-pixel column corresponding to the number of sub-pixels constituting each pixel, the sensing unit 310 may control the gate line GL driven by the scan signal SCAN. It is possible to sense the voltage V2 of the second node N2 of the driving transistor DRT for all sub-pixels of .

That is, the sensing unit 310 determines one gate line GL driven by the scan signal SCAN according to the number of sub-pixels constituting one pixel and the number of corresponding reference voltage lines RVL. Sensing may be performed multiple times on the gate line GL. Accordingly, the compensation unit 320 that receives the sensing data from the sensing unit 310 and calculates the compensation data may also calculate the compensation data multiple times for one gate line GL.

6 is a diagram illustrating a sensing timing of the organic light emitting diode display 100 according to example embodiments.

Referring to FIG. 6 , in the organic light emitting diode display 100 according to the embodiments, when a power on signal is generated, a characteristic value of a driving transistor DRT in each subpixel disposed on the display panel 110 . can be sensed. This sensing process is called "On-Sensing Process".

In addition, when a power off signal is generated, before an off-sequence such as power cut off proceeds, the characteristic value of the driving transistor DRT in each subpixel disposed on the display panel 110 . can also be sensed. This sensing process is referred to as "Off-Sensing Process".

Also, the characteristic value of the driving transistor DRT in each subpixel disposed in the display panel 110 may be sensed for each blank time during display driving after the power-on signal is generated until the power-off signal is generated. Such a sensing process is called a "real-time sensing process".

The real-time sensing process may be performed for each blank time between active times based on the vertical synchronization signal Vsync.

Since the mobility sensing of the driving transistor DRT requires only a short time, it may be performed after the power-on signal is generated before the display driving starts, or is performed when the display is not driven after the power-off signal is generated. can be

In addition, sensing the mobility of the driving transistor DRT may be performed in real time by using a short blank time while the display is being driven.

That is, the mobility sensing of the driving transistor DRT may be performed as an on-sensing process before a power-on signal is generated to start driving the display, or a power-off signal is generated to drive the display. It may proceed as an off-sensing process during the non-disabled period, and may proceed as a real-time sensing process every short blank time while the display is driven.

In contrast, since the threshold voltage sensing Vth of the driving transistor DRT requires a long voltage saturation time Vsat of the second node N2 of the driving transistor DRT, movement of the driving transistor DRT is required. Compared to mobility sensing, it takes a relatively long time.

In consideration of this point, the threshold voltage sensing of the driving transistor DRT should be performed using a timing that does not interfere with the user's viewing.

Therefore, in general, the threshold voltage sensing of the driving transistor DRT may be performed after a power off signal is generated according to a user input, etc., while the display is not driven, that is, in a situation in which the user does not intend to watch. .

However, in some cases, the threshold voltage sensing of the driving transistor DRT may also be performed through an on-sensing process or a real-time sensing process.

Meanwhile, as the number of sub-pixels increases due to an increase in resolution of the organic light emitting display device 100 in recent years, the compensation execution time for compensating for a characteristic value deviation between sub-pixels is also increasing.

The compensation execution time is increased due to an increase in the sensing time for sensing characteristic values of a plurality of sub-pixels due to an increase in the number of sub-pixels.

On the other hand, the compensation data stored in the memory unit 330 must be transmitted to the compensation unit 320 to compensate for the variation in the characteristic values between sub-pixels, and the increase in the data amount of the compensation data is performed by the compensation unit 320 in the memory unit 330 . Increase the data transfer time to the Accordingly, the compensation execution time is also increased by an increase in the amount of compensation data stored in the memory unit 330 .

7 illustrates compensation data transmitted between a compensation unit and a memory unit according to embodiments.

Referring to FIG. 6 , the data transmission process of FIG. 7 will be described. When a power on signal is generated, the memory unit 330 performs an on-sensing process normally performed by the compensator 320 in the memory unit 330 . ), all stored initial compensation data ICD is transmitted to the compensation unit 320 .

For example, as shown in FIG. 7 , when initial compensation data of first to fourth initial compensation data ICD1 to ICD4 for compensating for different characteristics of a plurality of subpixels are stored in the memory unit 330 . , the memory unit 330 transfers all of the first to fourth initial compensation data ICD1 to ICD4 to the compensation unit 320 .

In this case, the plurality of initial compensation data ICD1 to ICD4 may be stored in different designated areas of the memory unit 330 , and each of the plurality of initial compensation data ICD1 to ICD4 may be configured according to the arrangement position of the sub-pixel to be compensated. It can be stored separately.

That is, each of the plurality of initial compensation data ICD1 to ICD4 may be stored to match the plurality of subpixels.

Here, at least one of the first to fourth initial compensation data ICD1 to ICD4 may be intrinsic compensation data CCD, and the rest may be environmental compensation data ECD.

As described above, the intrinsic compensation data CCD is data for compensating for a deviation according to the intrinsic characteristics of the plurality of sub-pixels SP generated during manufacturing, and for example, the mobility α of the driving transistor DRT. ) and the threshold value (Φ) may be compensation data. In addition, the unique compensation data CCD may be compensation data for compensating for a luminance deviation of each sub-pixel when a data voltage corresponding to black image data is applied to the display panel 110 .

In some cases, the intrinsic compensation data CCD may include a compensator parameter for initial setting of the compensator.

Meanwhile, the environmental compensation data ECD may include real-time reference data RT_ref serving as a reference for deriving compensation data from sensing data sensed during the real-time sensing process.

In addition, compensation data for the additional variation ΔΦ for compensating for the degree of deterioration of the organic light emitting diode (OLED) according to the usage time of the organic light emitting display device 100 may be included.

In addition, the compensation data obtained during the off-sensing process may be stored together in the environmental compensation data ECD.

And when all of the initial compensation data ICD is received, the compensation unit 320 performs an on-sensing process. The compensator 320 obtains compensation data for each of the plurality of subpixels SP of the display panel 100 by using the sensing data obtained in the on-sensing process and the initial compensation data ICD, and thereafter, the controller The image data transmitted in 140 is compensated.

That is, the organic light emitting display device 100 displays the image after the compensation unit 320 obtains compensation data as in Equation 2 using the sensing data and the initial compensation data ICD obtained in the on-sensing process. .

That is, the compensation unit 320 generates the compensation data CD by using two or more initial compensation data among the plurality of initial compensation data ICD1 to ICD4. Accordingly, the generated compensation data CD may be referred to as integrated initial compensation data.

In this case, the compensator 320 receives the initial compensation data ICDn for the sub-pixel selected from among the plurality of sub-pixels according to a predetermined order in order to reduce the time for acquiring the compensation data, and after calculating the compensation data It may be configured to receive initial compensation data ICDn+1 for the selected subpixel.

That is, as shown in FIG. 7 , the initial compensation data ICDn for a plurality of sub-pixels selected by the selected gate line GLn among the plurality of gate lines GL is received, and the compensation data CD is calculated. During the operation, initial compensation data ICDn+1 for a plurality of sub-pixels selected by the next gate line GLn+1 may be received.

Meanwhile, the compensator 320 generates and updates compensation data CD by performing a real-time sensing process while driving the display after the power-on signal is generated until the power-off signal is generated.

In this case, the compensation unit 320 may generate and update compensation data CDn for a selected sub-pixel among a plurality of sub-pixels according to a predetermined order, and the compensation data CDn is stored in a separate memory (eg, a volatile memory). ) can be temporarily stored.

In addition, the compensator 320 uses the sensing data and compensation data CD obtained during the off-sensing process after the power-off signal is generated as the environmental compensation data ECD of the initial compensation data ICD, and the memory unit 330 ) can be stored in

As described above, although the compensation unit 320 is configured to receive the initial compensation data ICDn+1 for the subsequently selected sub-pixel while calculating the compensation data for the selected sub-pixel, the organic light emitting display device 100 The time from the generation of the power-on signal until the display of the image is not short as the high-resolution image increases and the data amount of the initial compensation data increases.

Here, an operation performed after the power-on signal is generated until an image is first displayed on the display panel 110 is called an on sequence, and the time required for the on sequence is a user response of the organic light emitting display device 100 . it's called time

In particular, when high-speed data transmission between the compensator 320 and the memory unit 330 is not possible, the time for the compensator 320 to receive the initial compensation data ICD is longer than the time for the compensator 320 to calculate the compensation data. Therefore, the user response time is greatly increased.

That is, the user response time is not short, which may cause inconvenience to the user.

8 is an exemplary diagram of a system implementation of the organic light emitting display device 100 according to embodiments.

Referring to FIG. 8 , each gate driver integrated circuit GDIC may be mounted on a film GF connected to the display panel 110 when implemented in a chip-on-film (COF) method.

Each source driver integrated circuit SDIC may be mounted on a film SF connected to the display panel 110 when implemented in a chip-on-film (COF) method.

The organic light emitting display device 100 includes at least one source printed circuit board (SPCB), control components, and at least one source printed circuit board (SPCB) for circuit connection between a plurality of source driver integrated circuits (SDICs) and other devices A control printed circuit board (CPCB) for mounting various electrical devices may be included.

The film SF on which the source driver integrated circuit SDIC is mounted may be connected to at least one source printed circuit board SPCB. That is, one side of the film SF on which the source driver integrated circuit SDIC is mounted is electrically connected to the display panel 110 and the other side is electrically connected to the source printed circuit board SPCB.

The control printed circuit board (CPCB) 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 , and the gate driver 130 . A power management integrated circuit (PMIC: Power Management IC, 730) for supplying various voltages or currents or controlling various voltages or currents to be supplied may be mounted.

Here, the controller 140 may include the compensator 320 , and may further include a timing controller used in a typical display technology.

In addition, the memory unit 330 may be mounted on the control printed circuit board (CPCB). When the memory unit 330 includes a plurality of memories, each memory may be individually mounted on a control printed circuit board (CPCB) and electrically connected to the controller 140 .

Here, the memory of the memory unit 330 is a non-volatile memory, and may be, for example, a NAND Flash memory or an Embedded MultiMediaCard (eMMC).

In addition, another memory may be further mounted on the control printed circuit board (CPCB). For example, at least one of a read-only memory (ROM) and an electrically erasable programmable read-only memory (EEPROM) may be further mounted on the control printed circuit board (CPCB).

Here, another memory mounted on the control printed circuit board (CPCB) may store, for example, firmware and controller parameters for driving the controller 140 .

Meanwhile, the at least one source printed circuit board (SPCB) and the control printed circuit board (CPCB) may be circuitly connected through at least one connecting member.

Here, the connection member may be, for example, a flexible printed circuit (FPC), a flexible flat cable (FFC), or the like.

At least one source printed circuit board (SPCB) and control printed circuit board (CPCB) may be implemented by being integrated into one printed circuit board.

In addition, the organic light emitting display device 100 may further include a set board 740 electrically connected to the control printed circuit board (CPCB).

This set board 740 may also be referred to as a power board.

A main power management circuit 750 (M-PMC) that manages the overall power of the organic light emitting diode display 100 may exist in the set board 740 .

The power management integrated circuit 730 is a circuit for managing power to a display module including the display panel 110 and its driving circuits 120 , 130 , 140 , and the like. In addition, the main power management circuit 750 is a circuit that manages the overall power including the display module, and may interwork with the power management integrated circuit 730 .

For example, the main power management circuit 750 may supply the driving voltage VDD, the panel driving voltage EVDD, and the like to the control printed circuit board CPCB. The controller 140 on the control printed circuit board (CPCB) may be driven by receiving the driving voltage VDD, and the power management integrated circuit 730 may supply the panel driving voltage EVDD to the display panel 110 . .

In FIG. 8 , the memory unit 330 is disposed on the control printed circuit board (CPCB), and the distance between the memory unit 330 and the controller 140 is close to each other.

Accordingly, data transmission between the controller 140 and the memory unit 330 may be less affected by noise because the transmission line has a short length, and thus high-speed data transmission may be performed.

But high-speed data transmission is not only the transmission line. The operation speed of the controller 140 and the memory unit 330 must be increased, and the memory of the controller 140 and the memory unit 330 capable of operating at a high speed is more expensive than the case of operating at a low speed. ) is a factor in the price increase.

On the other hand, the organic light emitting display device 100 is generally inspected to determine whether the display panel 110 is normal after the display panel 110 and at least one source printed circuit board (SPCB) are electrically connected during manufacturing. is performed In this case, a characteristic value of each sub-pixel may be measured.

In this case, when the plurality of gate driver integrated circuits GDIC and the plurality of source driver integrated circuits SDIC are electrically connected to the display panel 110 , each sub-pixel of the display panel 110 can be easily driven. This is because it is also necessary to determine whether the plurality of gate driver integrated circuits GDIC and the plurality of source driver integrated circuits SDIC operate normally.

And, as described above, compensation data for compensating for the measured characteristic value of each sub-pixel is stored in the memory unit 330 mounted on the control printed circuit board (CPCB). Accordingly, compensation data corresponding to the specific display panel 110 in which the characteristic value of the sub-pixel is measured is stored in the memory unit 330 , and the compensation data stored in the memory unit 330 cannot be applied to other display panels 110 . .

Meanwhile, the control printed circuit board (CPCB) is generally coupled after the display panel 110 is inspected. This is to reduce loss that may occur when at least one of the display panel 110 , the plurality of gate driver integrated circuits GDIC and the plurality of source driver integrated circuits SDIC is determined to be abnormal.

Therefore, the control printed circuit board (CPCB) must be electrically connected to at least one source printed circuit board (SPCB) connected to the display panel 110 corresponding to the compensation data stored in the mounted memory unit 330 .

During mass production, a plurality of control printed circuit boards (CPCBs) are individually identified according to compensation data stored in the memory unit 330 and connected to the source printed circuit boards (SPCBs) of the corresponding display panel 110 during manufacturing. By complicating the process, it becomes a factor which increases the manufacturing time and manufacturing cost.

9 is a diagram illustrating another system implementation of the organic light emitting display device 100 according to the exemplary embodiment.

In FIG. 8 , the memory unit 330 is mounted on a control printed circuit board (CPCB), but in the organic light emitting display device 100 shown in FIG. 9 , the memory unit 330 is mounted on a source printed circuit board (SPCB). There is a difference in point.

As the memory unit 330 is mounted on the source printed circuit board (SPCB), the control printed circuit board (CPCB) may be electrically connected to the source printed circuit board (SPCB) without distinguishing the control printed circuit board (CPCB) during the manufacturing process.

That is, by greatly improving process convenience, it is possible to reduce manufacturing time and manufacturing cost.

On the other hand, when the memory unit 330 is mounted on the source printed circuit board (SPCB), the distance between the memory unit 330 and the controller 140 is greater than that of FIG. 7 .

Therefore, it is difficult for the controller 140 and the memory unit 330 to transmit data at high speed. That is, it is difficult to reduce the time required to transmit the compensation data stored in the memory unit 330 to the controller 140 including the compensation unit 320 .

In this case, the memory not included in the memory unit 330 may be mounted on the control printed circuit board (CPCB). That is, a memory for storing firmware and controller parameters for driving the controller 140 may be mounted on a control printed circuit board (CPCB).

Since the rest of the configuration is the same as that of FIG. 8 , a detailed description thereof will be omitted.

10 illustrates compensation data transmitted between a compensation unit and a memory unit according to other exemplary embodiments.

In FIG. 10 , the memory unit 330 uses a plurality of compensators 320 when a power off signal is generated, not when a power on signal is generated, unlike in FIG. 7 . of initial compensation data (ICD1 ~ ICD4).

In addition, the compensator 320 generates integrated initial compensation data CICD by using at least two of the received plurality of initial compensation data ICDs.

In this case, the compensation unit 320 may generate the integrated initial compensation data CICD according to Equation 2, for example. That is, the compensation data CD calculated according to Equation 2 may be obtained as the integrated initial compensation data CICD.

In FIG. 7 , when the power-on signal is applied, the compensation unit 320 receives a plurality of initial compensation data ICD1 to ICD4 , and compensation data using two or more of the received plurality of initial compensation data ICD1 to ICD4 . was created.

However, when the power-off signal is applied, the compensator 320 of FIG. 10 receives a plurality of initial compensation data ICD1 to ICD4, and receives a plurality of initial compensation data ICD1 to ICD4 and the sensing unit 310. Each of the plurality of initial compensation data ICD1 to ICD4 may be updated using the transmitted sensing data and stored in the memory unit 330 .

Then, the integrated initial compensation data CICD is generated by using two or more of the received plurality of initial compensation data ICD1 to ICD4. The compensator 320 may store the acquired integrated compensation data CICD separately from the plurality of initial compensation data ICD1 to ICD4 in the memory unit 330 .

Meanwhile, when the power-on signal is received, the memory unit 330 transmits the stored integrated initial compensation data CICD to the compensation unit 320 .

Here, since the integrated initial compensation data CICD is compensation data in which two or more of the plurality of initial compensation data ICD1 to ICD4 are integrated, the amount of data is significantly smaller than that of the entire plurality of initial compensation data ICD1 to ICD4.

For example, when all of the first to fourth initial compensation data ICD1 to ICD4 are used to generate the integrated initial compensation data CICD, the data amount of the integrated initial compensation data CICD is the first to fourth initial compensation data. The compensation data (ICD1 to ICD4) may be 1/4 of the total data amount.

Accordingly, when the integrated initial compensation data CICD is transmitted, the transmission time can be significantly reduced compared to the case of transmitting a plurality of initial compensation data ICD1 to ICD4.

This can greatly improve user responsiveness by reducing the time until the organic light emitting display device 100 displays an image after the power-on signal is generated.

Alternatively, by lowering the data transfer rate between the compensation unit 320 and the memory unit 330 while maintaining user responsiveness, low-speed communication is possible.

For example, the compensation unit 320 and the memory unit 330 may transmit and receive data in a single data rate mode (SDR mode).

In this case, the data transmission restriction due to the distance between the compensating unit 320 and the memory unit 330 is removed, and as shown in FIG. 9 , the location of the memory unit 330 is placed on the source printed circuit board (SPCB). Even if it is mounted, it is possible to perform compensation stably.

This greatly improves process convenience, thereby reducing manufacturing time and manufacturing cost.

In addition, since the image data can be compensated using the integrated initial compensation data (CICD) generated by the off-sensing process during the period in which the display is not driven due to the generation of the power-off signal, the image data can be compensated. The on-sensing process performed before the signal is generated and the display starts driving may be omitted.

Therefore, it is possible to further improve user responsiveness by reducing not only the transmission time for the initial compensation data but also the sensing time for each sub-pixel.

In this case, the compensator 320 applies the integrated initial compensation data CICD to the integrated initial compensation data CICDn for a plurality of sub-pixels selected by the selected gate line GLn among the plurality of gate lines GL according to a predetermined order. ) can be received sequentially.

However, here, since the compensator 320 already receives the integrated initial compensation data CICD in which two or more of the plurality of initial compensation data ICD1 to ICD4 are integrated, the compensation unit 320 generates the compensation data CD. There is no need to separately perform calculations for

Therefore, time reduction due to sequential reception does not occur.

However, when a power-off signal is generated, the compensation unit 320 receives a plurality of initial compensation data ICD1 to ICD4 stored in the memory unit 330 and performs the integrated initial compensation data CICD, as shown in FIG. 7 . Similarly, while receiving the initial compensation data ICDn for a plurality of sub-pixels selected by the selected gate line GLn among the plurality of gate lines GL and calculating the integrated initial compensation data CICD, the next gate Initial compensation data ICDn+1 for a plurality of sub-pixels selected by the line GLn+1 may be received.

Although a delay time from generation of a power-off signal to power-off of the organic light emitting diode display does not cause a great inconvenience to a user, it is desirable to also reduce the time until power-off if possible.

Accordingly, in embodiments, the off-time is reduced by receiving the initial compensation data ICDn+1 for a plurality of next selected subpixels while calculating the integrated initial compensation data CICD for the selected subpixels. can

11 illustrates a method of driving an organic light emitting diode display according to example embodiments.

Referring to FIG. 11 , in the method of driving the organic light emitting diode display according to the exemplary embodiment, a power on signal is first received ( S121 ). When a power-on signal is generated, the compensation unit 320 receives the integrated initial compensation data CICD stored in the memory unit 330 ( S122 ).

Then, the compensator 320 compensates the image data transmitted from the controller 140 using the received integrated initial compensation data CICD to display the driving image (S123). That is, the display panel 110 of the organic light emitting display device 100 is driven to display.

Meanwhile, a power on signal is received (S124).

When the power-on signal is received, the compensation unit 320 individually receives a plurality of initial compensation data ICD1 to ICD4 stored in the memory unit 330 ( S125 ).

The compensation unit 320 uses the received plurality of initial compensation data ICD1 to ICD4 and the sensing data transmitted from the sensing unit 310 to update each of the plurality of initial compensation data ICD1 to ICD4, and the memory unit ( 330) (S126).

Also, the compensator 320 updates the integrated initial compensation data CICD by using the plurality of updated initial compensation data ICD1 to ICD4 and stores it in the memory unit 330 ( S126 ).

Accordingly, when the power-on signal is received again thereafter, the compensator 320 may compensate the image data transmitted from the controller 140 using the updated and stored integrated initial compensation data CICD in the memory unit 330 .

As a result, the method of driving the organic light emitting display device according to the exemplary embodiments may provide a more convenient organic light emitting display device to the user by reducing the user response time after the power-on signal is generated.

In addition, it is possible to reduce the time required for the organic light emitting diode display to display an image by reducing the time for loading compensation data for compensating for the characteristic value deviation between sub-pixels during power-on.

In addition, by improving the convenience in the manufacturing process, it is possible to shorten the manufacturing time and reduce the manufacturing cost.

The above description and the accompanying drawings are merely illustrative of the technical spirit 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. Accordingly, 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 scope equivalent thereto should be construed as being included in the scope of the present invention.

100: organic light emitting display device 310: sensing unit
110: display panel 320: compensation unit
120: data driver 330: memory unit
130: gate driver
140: controller

Claims (11)

a display panel in which a plurality of sub-pixels defined by a plurality of gate lines and a plurality of data lines are arranged;
a sensing unit measuring a sensing voltage from the display panel and outputting sensing data for at least one subpixel among the plurality of subpixels;
Integrated initial compensation obtained by using a plurality of initial compensation data for compensating for different characteristics of the plurality of sub-pixels and at least two of the plurality of initial compensation data for collectively compensating for different characteristics of the plurality of sub-pixels a memory unit in which data is stored in advance; and
and a controller having a compensator configured to receive the integrated initial compensation data when a power-on signal is generated and compensate the image data for the at least one sub-pixel;
Each of the plurality of sub-pixels includes an organic light emitting diode and a driving transistor for driving the organic light emitting diode,
The different characteristics of the plurality of sub-pixels include a threshold voltage of the driving transistor and mobility of the driving transistor,
the compensator obtains the integrated initial compensation data using at least the threshold voltage and the mobility, and stores the acquired integrated initial compensation data in the memory unit;
The data amount of the integrated initial compensation data received by the compensator when the power-on signal is generated is smaller than the total data amount of the plurality of initial compensation data previously stored in the memory unit. According to claim 1,
The compensation unit,
When a power-off signal is generated, receiving the plurality of initial compensation data stored in the memory unit, updating the plurality of initial compensation data using the sensing data, and storing the updated initial compensation data in the memory unit organic light emitting display device. 3. The method of claim 2,
The compensation unit,
The organic light emitting display device updates the integrated initial compensation data by using the updated initial compensation data, and stores the updated integrated initial compensation data in the memory unit. 4. The method of claim 3,
The compensation unit,
An organic light emitting display device for storing the plurality of initial compensation data and the integrated initial compensation data separately in different designated areas of the memory unit. 3. The method of claim 2,
The plurality of initial compensation data,
and intrinsic compensation data for compensating for a unique characteristic generated during manufacturing among the characteristics of the sub-pixel, and environmental compensation data for compensating for a characteristic variation according to a usage environment of the organic light emitting display device;
The compensation unit,
When the power-off signal is generated, the organic light emitting display device updates the environment compensation data among the plurality of initial compensation data. 3. The method of claim 2,
The compensation unit,
An organic light emitting diode display for receiving a plurality of initial compensation data for a sub-pixel selected thereafter, while receiving and updating a plurality of initial compensation data for a sub-pixel selected from among the plurality of sub-pixels according to a predetermined order. According to claim 1,
The organic light emitting display device,
a gate driver driving the plurality of gate lines under the control of the controller; and
Further comprising a data driver for driving the plurality of data lines by supplying the image data under the control of the controller,
The memory unit,
An organic light emitting diode display mounted on a source printed circuit board for electrically connecting the data driver to the controller mounted on a control printed circuit board. 8. The method of claim 7,
The control printed circuit board,
An organic light emitting display device electrically connected to the source printed circuit board through a flexible printed circuit (FPC) or a flexible flat cable (FFC). According to claim 1,
The memory unit,
An organic light emitting diode display comprising at least one nonvolatile memory, wherein the at least one nonvolatile memory is an embedded multimedia card (eMMC) or a NAND flash memory. According to claim 1,
The memory unit,
An organic light emitting display device for transmitting and receiving data in a single data rate mode (SDR mode) with the compensator. A display panel in which a plurality of sub-pixels are arranged, a sensing unit measuring a sensing voltage from the display panel and outputting sensing data for at least one sub-pixel among the plurality of sub-pixels, a memory unit, and the at least one sub-pixel A method of driving an organic light emitting display device comprising a controller having a compensator for compensating for image data, the method comprising:
When a power-on signal is generated, a plurality of initial compensation data for compensating for different characteristics of the plurality of sub-pixels stored in advance in the memory unit, and integrated initial compensation data for collectively compensating for different characteristics of the plurality of sub-pixels receiving the integrated initial compensation data and compensating for the image data for the at least one sub-pixel;
When a power-off signal is generated, receiving the plurality of initial compensation data stored in the memory unit, updating the plurality of initial compensation data using the sensing data, and storing the updated initial compensation data in the memory unit step; and
updating the integrated initial compensation data by using two or more of the plurality of updated initial compensation data, and storing the updated integrated initial compensation data in the memory unit;
Each of the plurality of sub-pixels includes an organic light emitting diode and a driving transistor for driving the organic light emitting diode,
The different characteristics of the plurality of sub-pixels include a threshold voltage of the driving transistor and mobility of the driving transistor,
the compensator obtains the integrated initial compensation data using at least the threshold voltage and the mobility, and stores the acquired integrated initial compensation data in the memory unit;
The data amount of the integrated initial compensation data received by the compensator when the power-on signal is generated is smaller than the total data amount of the plurality of initial compensation data previously stored in the memory unit.

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