KR102513097B1 - Controller, organic light emitting display device, and driving method - Google Patents

Abstract

Embodiments of the present invention relate to a controller, an organic light emitting display device, and a driving method, and more particularly, after generating a power-on signal, measuring a temperature through a temperature sensor, and displaying an image on a display panel according to the measured temperature. A controller capable of controlling a display start point, an organic light emitting display device, and a driving method. According to the embodiments of the present invention, it is possible to shorten the time required to start displaying an image after power is turned on while improving image quality by providing a driving operation suitable for a temperature.

Description

Controller, organic light emitting display device and driving method {CONTROLLER, ORGANIC LIGHT EMITTING DISPLAY DEVICE, AND DRIVING METHOD}

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

Recently, an organic light emitting display device that has been in the limelight as a display device uses an organic light emitting diode (OLED) that emits light by itself, and has advantages such as fast response speed, luminous efficiency, luminance, and viewing angle.

An organic light emitting display device arranges organic light emitting diodes and subpixels including driving transistors for driving them in a matrix form, and controls brightness of subpixels selected by a scan signal according to grayscale of data.

In the case of an organic light emitting display device, an organic light emitting diode and a driving transistor for driving the organic light emitting diode are disposed in each subpixel defined on the display panel. : threshold voltage, mobility) may change according to the driving time, or characteristic value deviation between each circuit element may occur due to a difference in driving time of each subpixel. Due to this, luminance deviation (luminance non-uniformity) between subpixels may occur, and image quality may deteriorate.

In the case of a conventional organic light emitting display device, in order to solve a luminance deviation between subpixels, a technique for compensating for a characteristic value deviation between circuit elements by sensing a characteristic value or a change thereof of a circuit element in each subpixel has been proposed.

However, in the case of the conventional compensation technology, there is a problem in that it takes a lot of time to sense the characteristic value or change thereof of the circuit element in each subpixel. In particular, when the size or resolution of the display panel increases, it may take too much time to sense all subpixels disposed on the display panel. Due to this, the user may experience great inconvenience in the operation of the organic light emitting display device.

In addition, in the case of the conventional compensation technology, there is a problem in that image quality is still not improved despite compensating for a characteristic value deviation by sensing a characteristic value or a change thereof of a circuit element in each subpixel.

Meanwhile, an organic light emitting display device operates at various temperatures, and the characteristic values of circuit elements in each sub-pixel of the display panel are sensitively affected by the ambient temperature, so that the image quality of the display panel changes according to the ambient temperature. or deterioration problems may occur.

Against this background, an object of embodiments of the present invention is to provide a controller, an organic light emitting display device, and a driving method enabling good image quality even when the ambient temperature changes.

Another object of the embodiments of the present invention is to prevent a phenomenon in which image display starts too late due to an operation (reference sensing drive) that takes a long time and is required to obtain a reference sensing value required after video display starts before video display starts. An object of the present invention is to provide a controller, an organic light emitting display device, and a driving method capable of alleviating the problem.

Another object of the embodiments of the present invention is to provide a controller, an organic light emitting display device, and a driving method that shortens the time required to start displaying an image after power is turned on while improving image quality by providing a driving operation suitable for temperature. is to provide

Another object of the embodiments of the present invention is to pre-store a lookup table for each temperature including a reference sensing value that is a reference for compensation, and use this to perform image display driving and real-time sensing driving (sensing driving during video display driving). Accordingly, it is an object of the present invention to provide a controller, an organic light emitting display device, and a driving method capable of displaying an image suitable for the current ambient temperature and performing compensation processing.

Another object of the embodiments of the present invention is a controller and an organic light emitting display device capable of normally compensating characteristic values of circuit elements in subpixels during image display driving while enabling an image to be quickly displayed after power is turned on. And to provide a driving method.

In one aspect, embodiments of the present invention provide a display panel in which a plurality of data lines and a plurality of gate lines are disposed, and a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged; An organic light emitting display device including a data driving circuit for driving data lines, a gate driving circuit for driving a plurality of gate lines, a controller for controlling the data driving circuit and the gate driving circuit, and a temperature sensor for measuring ambient temperature. can provide.

The controller of the organic light emitting display device may control the start time of displaying an image on the display panel according to the measured temperature after the power-on signal is generated.

Depending on the measured temperature, the controller may control the process to proceed differently between the time when the power-on signal is generated and the time when the image display starts.

The organic light emitting display device may further include a memory that stores a lookup table for each temperature.

Depending on whether a lookup table corresponding to the measured temperature is stored in the memory, the controller may control the process to proceed differently between the time when the power-on signal is generated and the time when the image display starts.

In an organic light emitting display device, when a look-up table corresponding to the measured temperature is stored in memory, the time interval between the time when the power-on signal is generated and the start of image display is determined by the number of times the look-up table corresponding to the measured temperature is not stored in memory In this case, the time interval between the generation time of the power-on signal and the start time of image display may be shorter than the time interval.

When the measured temperature is the first temperature after the power-on signal is generated, the controller controls an image to be displayed on the display panel after the first processing period from the time when the power-on signal is generated, and the measured temperature is the first temperature. When the second temperature is different from the second temperature, the display panel may be controlled to display an image after the second processing period after the power-on signal is generated.

When the measured temperature is the second temperature, the second processing period from the time of generation of the power-on signal to the start of image display is the second processing period from the time of generation of the power-on signal to the start of image display when the measured temperature is the first temperature. 1 treatment period may be longer.

Each of the plurality of subpixels includes an organic light emitting diode, a driving transistor for driving the organic light emitting diode, a first transistor for transferring a data voltage to a first node of the driving transistor, and a first node and a second node of the driving transistor. A storage capacitor electrically connected between nodes may be included.

Before the power-on signal is generated, the memory may pre-store a look-up table corresponding to the first temperature and may not store a look-up table corresponding to the second temperature.

The lookup table corresponding to the first temperature may include, as a reference sensing value, a sensing value for sensing a characteristic value or a change in characteristic value of a driving transistor included in each of a plurality of subpixels under the condition of the first temperature.

Compared to the first processing period, the second processing period may further include a reference sensing driving period for sensing a characteristic value or a change in characteristic value of a driving transistor included in each of the plurality of subpixels.

After the reference sensing driving period has elapsed, the controller may newly create a lookup table corresponding to the second temperature and store it in a memory.

The reference sensing driving period may include a first reference sensing driving period for a first subpixel and a second reference sensing driving period for a second subpixel different from the first subpixel.

Each of the first reference sensing driving period and the second reference sensing driving period includes a period in which a data voltage for sensing driving is applied to the first node of the driving transistor and a reference voltage for driving sensing is applied to the second node of the driving transistor; It may include a period in which the voltage of the second node of the driving transistor increases and a period in which the voltage of the second node of the driving transistor is sensed.

A voltage rising speed of the second node of the driving transistor included in the first subpixel may be different from a voltage rising speed of the second node of the driving transistor included in the second subpixel.

When the measured temperature is the second temperature, the controller refers to a look-up table for the second temperature newly generated and stored in the memory during the reference sensing driving period in the second processing period to change image data for image display and output the can do.

When the measured temperature is the first temperature, the controller may change and output image data for displaying an image by referring to a lookup table corresponding to the first temperature.

The look-up table for each temperature initially stored in the memory may include a look-up table corresponding to each of the three reference temperatures.

After an image is displayed on the display panel, sensing driving for one or more subpixels may be performed for each blank time.

In another aspect, embodiments of the present invention include the steps of detecting the generation of a power-on signal, measuring the ambient temperature, and controlling the start time of displaying an image on a display panel according to the measured temperature. A driving method of an organic light emitting display device may be provided.

In the controlling step, the process may proceed differently between the time when the power-on signal is generated and the time when the image display starts, according to the measured temperature.

The controlling step may include determining whether or not a lookup table corresponding to the measured temperature is stored in the memory, and if it is determined that the lookup table corresponding to the measured temperature is stored in the memory as a result of the determination, the measured temperature stored in the memory Proceeding with image display driving with reference to a look-up table corresponding to the temperature, and if it is determined that the look-up table corresponding to the measured temperature is not stored in the memory as a result of the determination, proceed with reference sensing driving for each of a plurality of subpixels and generating a new look-up table corresponding to the measured temperature including reference sensing values for each of a plurality of subpixels according to the progress result of the reference sensing drive and storing the newly generated lookup table stored in the memory. A step of performing image display driving with reference to a lookup table corresponding to the temperature may be included.

In another aspect, embodiments of the present invention provide a temperature sensor within the organic light emitting display device through a sensing unit that detects the generation of a power-on signal and a temperature sensor included in the organic light-emitting display device when the generation of the power-on signal is detected. It is possible to provide a controller including a temperature measurement unit for measuring , and an image display start control unit for controlling an image display start time on a display panel according to the measured temperature.

The image display start control unit may control the process to proceed differently between the time when the power-on signal is generated and the time when the image display starts, according to the measured temperature.

The controller may further include a memory that stores a lookup table for each temperature.

The video display start control unit determines whether a lookup table corresponding to the measured temperature is stored in the memory, and controls the process to proceed differently between the time when the power-on signal is generated and the time when the image display starts according to the determination result. can

The image display start control unit may determine whether a lookup table corresponding to the measured temperature is stored in the memory.

When it is determined that the look-up table corresponding to the measured temperature is stored in the memory according to the determination result, the image display start control unit may refer to the look-up table corresponding to the measured temperature previously stored in the memory to perform image display driving.

If it is determined that the look-up table corresponding to the measured temperature is not stored in the memory according to the determination result, the image display start control unit proceeds with reference sensing driving for each of a plurality of subpixels, and according to the progress result of the reference sensing driving A look-up table corresponding to the measured temperature including reference sensing values for each of a plurality of sub-pixels is newly created and stored in memory, and an image display is driven by referring to the newly created look-up table corresponding to the measured temperature stored in the memory. can proceed.

When the look-up table corresponding to the measured temperature is stored in the memory, the time interval between the generation of the power-on signal and the start of the image display is It may be shorter than the time interval between the time of occurrence and the start of image display.

According to the embodiments of the present invention described above, good image quality can be provided even when the ambient temperature changes.

According to embodiments of the present invention, a phenomenon in which image display starts too late due to an operation (reference sensing drive) that takes a long time and is required to acquire a reference sensing value before video display starts after video display starts is mitigated. By doing so, the time from when the power-on signal is generated to when the image display starts can be reduced as much as possible.

According to the embodiments of the present invention, it is possible to shorten the time required to start displaying an image after power is turned on while improving image quality by providing a driving operation suitable for a temperature.

According to the embodiments of the present invention, a look-up table for each temperature including a reference sensing value serving as a reference for compensation is stored in advance, and image display driving and real-time sensing driving (sensing driving during video display driving) are performed using the look-up table for each temperature. , image display and compensation processing suitable for the current ambient temperature can be provided.

According to the embodiments of the present invention, it is possible to compensate for characteristic values of circuit elements within a sub-pixel while enabling an image to be quickly displayed after power is turned on, while driving an image display.

1 is a schematic system configuration diagram of an organic light emitting display device according to embodiments of the present invention.
2 is an exemplary diagram illustrating system implementation of an organic light emitting display device according to embodiments of the present invention.
3 is a circuit of a sub-pixel of an organic light emitting display device according to example embodiments of the present invention.
4 is a compensation circuit of an organic light emitting display device according to example embodiments.
5 is a driving timing diagram for sensing a threshold voltage of an organic light emitting display device according to embodiments of the present invention.
6 is a driving timing diagram for sensing mobility of an organic light emitting display device according to embodiments of the present invention.
7 is a diagram illustrating a sensing process that can be performed at various timings in an organic light emitting display device according to embodiments of the present invention.
8 is a layout view of four subpixels connectable to one sensing line and their peripheral wires in an organic light emitting display device according to embodiments of the present invention.
9 is an equivalent circuit of four subpixels connectable to one sensing line in an organic light emitting display device according to embodiments of the present invention.
10 is a diagram illustratively illustrating driving operation timing of an organic light emitting display device according to example embodiments of the present invention.
11 is a diagram illustrating a display on-time required to start displaying an image after a power-on signal is generated in an organic light emitting display device according to embodiments of the present invention.
FIG. 12 is a conceptual diagram for explaining an operating method in which an organic light emitting display device according to embodiments of the present invention can reduce display on-time while providing accurate sensing and compensation suitable for ambient temperature.
13 and 14 are flowcharts of a method of driving an organic light emitting display device according to example embodiments.
15 is a conceptual diagram illustrating a method of reducing a display-on time when a lookup table for measured temperatures exists in an organic light emitting display device according to example embodiments of the present invention.
16 is a conceptual diagram illustrating a method for shortening a display-on time when a next power-on signal is generated when a look-up table for a measured temperature already exists in an organic light emitting display device according to embodiments of the present invention. .
17 is a diagram for explaining an effect of reducing display on-time of an organic light emitting display device according to embodiments of the present invention.
18 is a block diagram of a controller of an organic light emitting display device according to example embodiments.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention are described in detail below with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on 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.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the present invention. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is or may be directly connected to that other element, but intervenes between each element. It will be understood that may be "interposed", or each component may be "connected", "coupled" or "connected" through other components.

1 is a schematic system configuration diagram of an organic light emitting display device 100 according to embodiments of the present invention.

Referring to FIG. 1 , an organic light emitting display device 100 according to the present embodiments includes a plurality of data lines DL and a plurality of gate lines GL, and a plurality of data lines DL and a plurality of gate lines GL. It may include a display panel 110 in which a plurality of subpixels SP defined by the gate line GL are arranged in a matrix type, and a driving circuit 111 for driving the display panel 110 .

From a functional point of view, the driving circuit 111 includes a data driving circuit 120 driving a plurality of data lines DL, a gate driving circuit 130 driving a plurality of gate lines GL, and a data driving circuit A controller 140 controlling the row 120 and the gate driving circuit 130 may be included.

In the display panel 110, the plurality of data lines DL and the plurality of gate lines GL may be disposed to cross each other. For example, the plurality of gate lines GL may be arranged in rows or columns, and the plurality of data lines DL may be arranged in columns or rows. Hereinafter, for convenience of description, it is assumed that the plurality of gate lines GL are arranged in rows and the plurality of data lines DL are arranged in columns.

In addition to the plurality of data lines DL and the plurality of gate lines GL, other types of wires may be disposed on the display panel 110 .

The controller 140 may supply image data DATA to the data driving circuit 120 .

In addition, the controller 140 supplies various control signals (DCS, GCS) necessary for driving the data driving circuit 120 and the gate driving circuit 130 to operate the data driving circuit 120 and the gate driving circuit 130. can control the operation of

The controller 140 starts scanning according to the timing implemented in each frame, converts the input image data input from the outside to suit the data signal format used in the data driving circuit 120, and converts the converted image data (DATA). and controls data drive at an appropriate time according to the scan.

In order to control the data driving circuit 120 and the gate driving circuit 130, the controller 140 includes a vertical sync signal (Vsync), a horizontal sync signal (Hsync), an input data enable (DE) signal, A timing signal such as the clock signal CLK is received from an external source (eg, a host system), and various control signals are generated and output to the data driving circuit 120 and the gate driving circuit 130 .

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

In addition, the controller 140, in order to control the data driving circuit 120, a source start pulse (SSP: Source Start Pulse), a source sampling clock (SSC: Source Sampling Clock), a source output enable signal (SOE: Source It outputs various data control signals (DCS: Data Control Signal) including Output Enable) and the like.

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

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

The data driving circuit 120 drives the plurality of data lines DL by receiving the image data DATA from the controller 140 and supplying data voltages to the plurality of data lines DL. Here, the data driving circuit 120 is also referred to as a source driving circuit.

The data driving circuit 120 may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

In some cases, the data driving circuit 120 may further include one or more analog to digital converters (ADCs).

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

The gate driving circuit 130 may include a shift register, a level shifter, and the like.

The gate driving circuit 130 sequentially supplies scan signals 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 driving circuit 130, the data driving circuit 120 converts the image data DATA received from the controller 140 into an analog data voltage to generate a plurality of data lines DL. supplied with

The data driving circuit 120 may be located on only one side (eg, upper or lower side) of the display panel 110, and in some cases, both sides of the display panel 110 ( eg on the upper side and the lower side).

The gate driving circuit 130 may be located on only one side (eg, the left or right side) of the display panel 110, and in some cases, both sides of the display panel 110 ( Example: left and right) may be located on both sides.

The data driving circuit 120 may be implemented by including at least one Source Driver Integrated Circuit (SDIC).

Each source driver integrated circuit (SDIC) is connected to a bonding pad of the display panel 110 or directly disposed on the display panel 110 using a Tape Automated Bonding (TAB) method or a Chip On Glass (COG) method. It could be. In some cases, each source driver integrated circuit (SDIC) may be integrated and disposed on the display panel 110 . In addition, each source driver integrated circuit (SDIC) may be implemented in a COF (Chip On Film) method. In this case, each source driver integrated circuit SDIC may be mounted on a circuit film and electrically connected to the data lines DL of the display panel 110 through the circuit film.

In the gate driving circuit 130 , one or more gate driver integrated circuits (GDICs) may be connected to bonding pads of the display panel 110 using a TAB method or a COG method. In addition, the gate driving circuit 130 may be implemented as a GIP (Gate In Panel) type and directly disposed on the display panel 110 . In addition, the gate driving circuit 130 may be implemented in a COF (Chip On Film) method. In this case, each gate driver integrated circuit (GDIC) included in the gate driving circuit 130 may be mounted on a circuit film and electrically connected to the gate lines GL of the display panel 110 through the circuit film. there is.

2 is an exemplary system implementation diagram of an organic light emitting display device 100 according to embodiments of the present invention.

In the example of FIG. 2, each source driver integrated circuit (SDIC) included in the data driving circuit 120 is implemented in a COF (Chip On Film) method among various methods (TAB, COG, COF, etc.), and the gate driving circuit (130) is implemented in a COF (Chip On Film) method among various methods (TAB, COG, COF, GIP, etc.).

The plurality of gate driver integrated circuits (GDIC) included in the gate driving circuit 130 are mounted on the gate-side circuit film GF, and the plurality of gates in the display panel 110 are provided through the gate-side circuit film GF. It may be electrically connected to the lines GL.

Each of the plurality of source driver integrated circuits (SDICs) included in the data driving circuit 120 may be mounted on the source-side circuit film (SF). One side of the source-side circuit film SF may be electrically connected to the display panel 110 .

Wires for electrically connecting the source driver integrated circuit SDIC and the display panel 110 may be disposed on the source-side circuit film SF.

The organic light emitting display device 100 mounts at least one source printed circuit board (SPCB), control parts, and various electrical devices for circuit connection between a plurality of source driver integrated circuits (SDICs) and other devices. It may include a control printed circuit board (CPCB) for

The other side of the source-side circuit 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 source-side circuit film SF on which the source driver integrated circuit (SDIC) is mounted may be electrically connected to the display panel 110 and the other side may be electrically connected to the source printed circuit board (SPCB). .

In the control printed circuit board (CPCB), the controller 140 for controlling operations of the data driving circuit 120 and the gate driving circuit 130, the display panel 110, the data driving circuit 120, and the gate driving circuit A power management integrated circuit (PMIC) 210 or the like that supplies various voltages or currents to 130 or the like or controls various voltages or currents to be supplied may be mounted.

The at least one source printed circuit board (SPCB) and the control printed circuit board (CPCB) may be circuitically connected through at least one connecting member. Here, the connecting member may be, for example, a flexible printed circuit (FPC) or a flexible flat cable (FFC).

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

The organic light emitting display device 100 may further include a set board 230 electrically connected to the control printed circuit board (CPCB). This set board 230 may also be referred to as a power board.

The set board 230 may include a main power management circuit 220 (M-PMC: Main Power Management Circuit) that manages overall power of the organic light emitting display device 100 .

The power management integrated circuit 210 is a circuit that manages power for the display module including the display panel 110 and its driving circuits 120, 130, 140, etc., and the main power management circuit 220 controls the display module. It is a circuit that manages overall power, including power management, and can work with the power management integrated circuit 210 .

Each subpixel (SP) arranged on the display panel 110 included in the organic light emitting display device 100 according to the present embodiments includes an organic light emitting diode (OLED), which is a self-light emitting device, and an organic light emitting diode (OLED). It may be composed of circuit elements such as a driving transistor for driving the diode OLED.

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.

3 is a circuit diagram of a sub-pixel SP of an organic light emitting display device 100 according to example embodiments.

A plurality of data lines (DL), a plurality of gate lines (GL), a plurality of driving voltage lines (DVL), a plurality of sensing lines (SL), and the like are disposed in the display panel 110 according to embodiments of the present invention. It can be.

Each subpixel SP in the display panel 110 includes an organic light emitting diode (OLED), a driving transistor (DRT) for driving the organic light emitting diode (OLED), and a first node (N1) of the driving transistor (DRT). ) and the corresponding data line DL, between the second node N2 of the driving transistor DRT and the corresponding sensing line SL among the plurality of sensing lines SL. It may be implemented by including a second transistor T2 electrically connected and a storage capacitor Cst electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

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

According to the circuit example of FIG. 3 , the anode electrode of the organic light emitting diode OLED may be electrically connected to the second node N2 of the driving transistor DRT. The ground voltage EVSS may be applied to the cathode electrode of the organic light emitting diode OLED.

Here, the base voltage EVSS may be, for example, a ground voltage or a voltage higher or lower than the ground voltage. Also, the electromotive voltage EVSS may vary according to the driving state. For example, the base voltage EVSS during image driving and the base voltage EVSS during sensing driving may be set differently.

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 may include a first node N1 , a second node N2 , and a third node N3 .

The first node N1 of the driving transistor DRT may be 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 a source node or a drain node, may be electrically connected to an anode electrode (or a cathode electrode) of the organic light emitting diode OLED, and may be the second node of the second transistor T2. It may also be electrically connected to a source node or a drain node. The third node N3 of the driving transistor DRT may be a drain node or a source node, to which the driving voltage EVDD may be applied, and a driving voltage line DVL supplying the driving voltage EVDD. ) and electrically connected. Hereinafter, for convenience of description, in the driving transistor DRT, the first node N1 is a gate node, the second node N2 is a source node, and the third node N3 is a drain node. can be heard and explained.

The storage capacitor Cst is electrically connected between the first node N1 and the second node N2 of the driving transistor DRT to generate a data voltage Vdata corresponding to the image signal voltage or a voltage corresponding thereto. It can be maintained for the frame time (or a fixed amount of time).

The drain node or source node of the first transistor T1 is electrically connected to the corresponding data line DL, and the source node or drain node of the first transistor T1 is connected to the first node N1 of the driving transistor DRT. and the gate node of the first transistor T1 is electrically connected to the corresponding gate line to receive the scan signal SCAN.

The first transistor T1 may be turned on and off by being applied to a gate node of the scan signal SCAN through a corresponding gate line.

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

The drain node or source node of the second transistor T2 is electrically connected to the sensing line SL, and the source node or drain node of the second transistor T2 is connected to the second node N2 of the driving transistor DRT. can be electrically connected. A gate node of the second transistor T2 may be electrically connected to a corresponding gate line to receive the sense signal SENSE.

The on/off of the second transistor T2 may be controlled by receiving the sense signal SENSE to a gate node through a corresponding gate line.

The second transistor T2 may be turned on by the sense signal SENSE and transfer the reference voltage Vref supplied from the corresponding sensing line SL to the second node N2 of the driving transistor DRT. .

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

Each of the driving transistor DRT, the first transistor T1 and the second transistor T2 may be an n-type transistor or a p-type transistor.

Meanwhile, the scan signal SCAN and the sense signal SENSE may be separate gate signals. In this case, the scan signal SCAN and the sense 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 sense signal SENSE may be the same gate signal. In this case, the scan signal SCAN and the sense 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.

Each sub-pixel structure illustrated in FIG. 3 is a 3T (transistor) 1C (capacitor) structure, which is only an example for description, and may further include one or more transistors or, in some cases, one or more capacitors. may be Alternatively, each of a plurality of subpixels may have the same structure, and some of the plurality of subpixels may have a different structure.

Below, an image driving operation of each sub-pixel (SP) will be briefly described as an example.

The display driving (also referred to as image driving or image display driving) operation of each subpixel SP may proceed to an image data recording step, a boosting step, and a light emitting step.

In the image data writing step, the image driving data voltage Vdata corresponding to the image signal is applied to the first node N1 of the driving transistor DRT, and the image data voltage Vdata is applied to the second node N2 of the driving transistor DRT. A driving reference voltage Vref may be applied. Here, due to a resistance component between the second node N2 of the driving transistor DRT and the sensing line SL, a voltage similar to the reference voltage Vref is applied to the second node N2 of the driving transistor DRT ( Vref') may be applied.

The reference voltage Vref for image driving is also referred to as VpreR.

In the image data writing step, the first transistor T1 and the second transistor T2 may be turned on simultaneously or with a slight time difference.

In the image data recording step, the storage capacitor Cst may be charged with an electric charge corresponding to a potential difference between both ends (Vdata-Vref or Vdata-Vref').

Applying the image driving data voltage Vdata to the first node N1 of the driving transistor DRT is referred to as image data writing.

In the boosting step following the image data writing step, the first node N1 and the second node N2 of the driving transistor DRT may be electrically floated simultaneously or with a slight time difference.

To this end, the first transistor T1 may be turned off by the turn-off level voltage of the scan signal SCAN. Also, the second transistor T2 may be turned off by the turn-off level voltage of the sense signal SENSE.

In the boosting step, while the voltage difference between the first node N1 and the second node N2 of the driving transistor DRT is maintained, the first node N1 and the second node N2 of the driving transistor DRT are respectively The voltage of may be boosted.

During the boosting step, the voltage of each of the first node N1 and the second node N2 of the driving transistor DRT is boosted, and then the increased voltage of the second node N2 of the driving transistor DRT is When a certain voltage (that is, a voltage capable of turning on the organic light emitting diode (OLED), which is higher than the threshold voltage of the organic light emitting diode (OLED) from the base voltage (EVSS)) is reached, the light emitting stage is entered.

In this light emitting step, a driving current flows into the organic light emitting diode (OLED). Accordingly, the organic light emitting diode (OLED) may emit light.

The driving transistor DRT disposed in each of the plurality of sub-pixels SP arranged on the display panel 110 according to embodiments of the present invention has unique characteristics such as threshold voltage and mobility (also referred to as electron mobility). have

The driving transistor DRT may be deteriorated according to driving time. Accordingly, the unique characteristics of the driving transistor DRT may change according to driving time.

The on-off timing of the driving transistor DRT may vary or the driving capability of the organic light emitting diode OLED may vary according to a change in characteristic value. That is, the timing at which current is supplied to the organic light emitting diode (OLED) and the amount of current supplied to the organic light emitting diode (OLED) may be changed according to a change in characteristic values of the driving transistor DRT. According to the change in the characteristic value of the driving transistor DRT, the actual luminance of the corresponding subpixel SP may be different from the desired luminance.

Also, the plurality of subpixels SP arranged on the display panel 110 may have different driving times. Therefore, characteristic value deviations (threshold voltage deviations and mobility deviations) between the driving transistors DRT in each subpixel SP may occur.

The characteristic value deviation between the driving transistors DRT may cause a luminance deviation between the subpixels SP. Accordingly, luminance uniformity of the display panel 110 may be deteriorated, which may eventually lead to image quality deterioration.

Accordingly, the organic light emitting display device 100 according to embodiments of the present invention may include a compensation circuit capable of compensating for a characteristic value deviation between driving transistors DRT, and may provide a compensation method using the compensation circuit. This will be described in more detail with reference to FIGS. 4 to 7 .

4 is an exemplary compensation circuit of the organic light emitting display device 100 according to embodiments of the present invention.

The organic light emitting display device 100 according to embodiments of the present invention needs to sense a characteristic value or change in characteristic value of each driving transistor DRT in order to compensate for a characteristic value deviation between the driving transistors DRT.

The compensation circuit of the organic light emitting display device 100 according to the embodiments of the present invention drives (sensing drive) a subpixel SP having a 3T1C structure or a modified structure based on the 3T1C structure to drive within the subpixel SP. A sensing circuit 410 for sensing a characteristic value or change in characteristic value of the transistor DRT may be included.

In this specification, for convenience of description, “sensing a characteristic value or a characteristic value change of the driving transistor DRT in the subpixel SP” is also referred to as “sensing the subpixel SP”. In addition, “compensating for the characteristic value or change in characteristic value of the driving transistor DRT in the sub-pixel SP” is also referred to as “compensating for the sub-pixel SP”.

In the organic light emitting display device 100 according to embodiments of the present invention, the voltage of the sensing line SL is sensed through sensing driving, and the characteristic value of the driving transistor DRT in the subpixel SP is obtained from the sensed voltage. Or you can find out the change in the characteristic value.

Here, the sensing line SL serves not only to deliver the reference voltage Vref, but also to serve as a sensing line for sensing the characteristic value of the subpixel or its change (eg, the characteristic value of the driving transistor DRT or its change). can Meanwhile, since the sensing line SL also serves to transmit the reference voltage Vref, the sensing line SL may also be referred to as a reference voltage line.

More specifically, according to the sensing operation of the organic light emitting display device 100 according to the embodiments of the present invention, the characteristic value or change in characteristic value of the driving transistor DRT is the voltage of the second node N2 of the driving transistor DRT. (e.g. Vdata-Vth).

The voltage of the second node N2 of the driving transistor DRT may correspond to the voltage of the sensing line SL when the second transistor T2 is turned on. The line capacitor Cline on the sensing line SL may be charged by the voltage of the second node N2 of the driving transistor DRT. The sensing line SL may have a voltage corresponding to the voltage of the second node N2 of the driving transistor DRT by the charged line capacitor Cline.

The compensation circuit of the organic light emitting display device 100 according to embodiments of the present invention includes on-off control of each of a first transistor T1 and a second transistor T2 in a subpixel SP to be sensed, and , the second node N2 of the driving transistor DRT controls the characteristic values (threshold voltage, mobility) or changes in characteristic values of the driving transistor DRT through control of supply of the data voltage Vdata and the reference voltage Vref, respectively. It can be driven so as to reflect the voltage state.

Referring to FIG. 4 , the organic light emitting display device 100 according to example embodiments may include a sensing circuit 410 for sensing a plurality of sensing lines SL.

The sensing circuit 410 senses the voltage of the sensing line SL corresponding to the voltage of the second node N2 of the driving transistor DRT, and converts the sensed voltage into a sensing value corresponding to a digital value. It may include a digital converter (ADC) and a switch circuit (SAM, SPRE) for sensing driving.

The sensing circuit 410 may exist outside the data driving circuit 120 (eg, a PCB) or may be included inside the data driving circuit 120 .

The switch circuits SAM and SPRE for sensing driving may control a voltage state of a corresponding sensing line SL or control whether a corresponding sensing line SL is connected to an analog-to-digital converter ADC.

The switch circuits SAM and SPRE for sensing drive control the connection between each sensing line SL and the sensing drive reference voltage supply node Npres to which the reference voltage Vref is supplied. ) and a sampling switch (SAM) that controls the connection between each sensing line (SL) and the analog-to-digital converter (ADC).

The aforementioned reference switch SPRE for sensing driving is a switch used for sensing driving. The reference voltage Vref supplied to the sensing line SL by the sensing drive reference switch SPRE is “sensing drive reference voltage VpreS”.

Meanwhile, referring to FIG. 4 , the switch circuit may include an image driving reference switch RPRE used when driving an image.

The image driving reference switch RPRE may control the connection between each sensing line SL and the image driving reference voltage supply node Nprer to which the reference voltage Vref is supplied.

The image driving reference switch RPRE mentioned above is a switch used when driving an image. The reference voltage Vref supplied to the sensing line SL by the image driving reference switch SPRE is the "image driving reference voltage VpreR".

The reference switch for sensing driving (SPRE) and the reference switch for image driving (RPRE) may be provided separately or may be integrated into one. The reference voltage VpreS for sensing driving and the reference voltage VpreR for image driving may have the same voltage value or different voltage values.

The compensation circuit of the organic light emitting display device 100 according to embodiments of the present invention includes a memory MEM that stores a sensing value output from an analog-to-digital converter (ADC) or previously stores a reference sensing value, and a memory ( A compensator (COMP) that compares the sensing value stored in the MEM with a reference sensing value to calculate a compensation value for compensating for a characteristic value deviation may be further included.

The compensation value calculated by the compensator COMP may be stored in the memory MEM.

The controller 140 changes the image data Data to be supplied to the data driving circuit 120 using the compensation value calculated by the compensator COM, and outputs the changed image data Data_comp to the data driving circuit 120. can do.

Accordingly, the data driving circuit 120 converts the image data (Data_comp) changed through the digital-to-analog converter (DAC) into a data voltage (Vdata_comp) in the form of an analog signal, and converts the converted data voltage (Vdata_comp) into an output buffer ( BUF) to the corresponding data line DL. Accordingly, characteristic value deviations (threshold voltage deviation and mobility deviation) of the driving transistor DRT of the corresponding subpixel SP may be compensated for.

Meanwhile, referring to FIG. 4 , the data driving circuit 120 may include a data voltage output circuit 400 including a latch circuit, a digital-to-analog converter (DAC), and an output buffer (BUF). Accordingly, an analog-to-digital converter (ADC) and various switches (SAM, SPRE, RPRE) may be further included.

Alternatively, the analog-to-digital converter (ADC) and various switches (SAM, SPRE, and RPRE) may be located outside the data driving circuit 120, not inside the data driving circuit 120.

Referring to FIG. 4 , the compensator COMP may exist outside the controller 140 or may be included inside the controller 140 . Also, the memory MEM may be located outside the controller 140 or implemented in the form of a register inside the controller 140 .

5 is a driving timing diagram for sensing a threshold voltage of the organic light emitting display device 100 according to embodiments of the present invention.

Referring to FIG. 5 , threshold voltage sensing driving may proceed to an initialization step ( S510 ), a tracking step ( S520 ), and a sampling step ( S530 ).

In the initialization step S510, the first transistor T1 is turned on by the scan signal SCAN of the turn-on level voltage. Accordingly, the first node N1 of the driving transistor DRT is initialized with the data voltage Vdata_sen for driving the threshold voltage sensing.

In the initialization step S510, the second transistor T2 is turned on and the sensing drive reference switch SPRE is turned on by the sense signal SENSE of the turn-on level voltage. Accordingly, the second node N2 of the driving transistor DRT is initialized to the reference voltage VpreS for sensing driving.

The tracking step ( S520 ) is a step of tracking the threshold voltage (Vth) of the driving transistor (DRT). That is, in the tracking step S520, the voltage of the second node N2 of the driving transistor DRT reflecting the threshold voltage Vth of the driving transistor DRT is tracked.

In the tracking step ( S520 ), the first transistor T1 and the second transistor T2 maintain a turned-on state, and the sensing drive reference switch SPRE is turned off. Accordingly, the second node N2 of the driving transistor DRT floats, and the voltage of the second node N2 of the driving transistor DRT starts to rise from the sensing driving reference voltage VpreS.

Since the second transistor T2 is turned on, an increase in the voltage of the second node N2 of the driving transistor DRT leads to an increase in the voltage of the sensing line SL.

The voltage of the second node N2 of the driving transistor DRT rises and then becomes saturated. The saturated voltage of the second node N2 of the driving transistor DRT corresponds to the voltage difference (Vdata_sen -Vth) between the threshold voltage Vth of the driving transistor DRT in the data voltage Vdata_sen for driving the threshold voltage sensing. do.

Therefore, when the voltage of the second node N2 of the driving transistor DRT is saturated, the voltage of the sensing line SL changes from the threshold voltage sensing driving data voltage Vdata_sen to the voltage of the threshold voltage of the driving transistor DRT. Corresponds to the difference (Vdata_sen -Vth).

When the voltage of the second node N2 of the driving transistor DRT reaches saturation, the sampling switch SAM is turned on, and a sampling step ( S530 ) proceeds.

In the sampling step (S530), the analog-to-digital converter (ADC) senses the voltage of the sensing line (SL) connected by the sampling switch (SAM), and converts the sensed voltage (Vsen) into a sensed value corresponding to a digital value. can do. Here, the voltage Vsen sensed by the analog-to-digital converter (ADC) corresponds to “Vdata-Vth”.

The compensator (COMP) can determine the threshold voltage of the driving transistor (DRT) of the corresponding sub-pixel (SP) based on the sensing value output from the analog-to-digital converter (ADC), and determine the threshold voltage of the driving transistor (DRT) can compensate

The compensator (COMP) determines the value of the driving transistor (DRT) from the sensing value (digital value corresponding to Vdata_sen-Vth) measured through sensing driving and the known threshold voltage sensing and driving data (digital value corresponding to Vdata_sen). The threshold voltage (Vth) can be identified.

The compensator COMP compares the identified threshold voltage Vth of the corresponding driving transistor DRT with a reference threshold voltage or a threshold voltage of another driving transistor DRT to compensate for the threshold voltage deviation between the driving transistors DRT. can do it Here, the threshold voltage deviation compensation may mean image data change processing (processing of adding or subtracting a compensation value (offset) to image data).

6 is a driving timing diagram for sensing mobility of the organic light emitting display device 100 according to embodiments of the present invention.

Referring to FIG. 6 , mobility sensing driving may proceed to an initialization step ( S610 ), a tracking step ( S620 ), and a sampling step ( S630 ).

In the initialization step S610, the first transistor T1 is turned on by the scan signal SCAN of the turn-on level voltage. Accordingly, the first node N1 of the driving transistor DRT is initialized with the data voltage Vdata_sen for driving the mobility sensing.

In the initialization step S610, the second transistor T2 is turned on and the sensing drive reference switch SPRE is turned on by the sense signal SENSE of the turn-on level voltage. Accordingly, the second node N2 of the driving transistor DRT is initialized to the reference voltage VpreS for sensing driving.

The tracking step ( S620 ) is a step of tracking the mobility of the driving transistor DRT. Mobility of the driving transistor DRT may represent current driving capability of the driving transistor DRT. That is, in the tracking step ( S520 ), the voltage of the second node N2 of the driving transistor DRT from which the mobility of the driving transistor DRT can be calculated is tracked.

In the tracking step S620, the first transistor T1 is turned off by the scan signal SCAN of the turn-off level voltage, and the sensing drive reference switch SPRE is turned off. Accordingly, both the first node N1 and the second node N2 of the driving transistor DRT are floated. Accordingly, the voltages of the first node N1 and the second node N2 of the driving transistor DRT both rise. In particular, the voltage of the second node N2 of the driving transistor DRT starts to rise from the sensing driving reference voltage VpreS.

Since the second transistor T2 is turned on, an increase in the voltage of the second node N2 of the driving transistor DRT leads to an increase in the voltage of the sensing line SL.

When a predetermined time Δt elapses from the point at which the voltage of the second node N2 of the driving transistor DRT starts to rise, the sampling switch SAM is turned on and the sampling step S630 proceeds. do.

In the sampling step (S630), the analog-to-digital converter (ADC) senses the voltage of the sensing line (SL) connected by the sampling switch (SAM), and converts the sensed voltage (Vsen) into a sensed value corresponding to a digital value. can do. Here, the voltage Vsen sensed by the analog-to-digital converter ADC corresponds to a voltage (VpreS+ΔV) increased by a predetermined voltage ΔV from the sensing driving reference voltage VpreS.

The compensator COMP may determine the mobility of the driving transistor DRT of the corresponding subpixel SP based on the sensing value output from the analog-to-digital converter ADC, and determine the mobility of the driving transistor DRT. can compensate

The compensator COMP determines the value of the driving transistor DRT from the sensing value (digital value corresponding to VpreS+ΔV) measured through sensing driving, the already known reference voltage for sensing driving (VpreS) and the elapsed time (Δt). mobility can be identified.

The mobility of the driving transistor DRT is proportional to the amount of voltage variation (ΔV/Δt) per unit time of the sensing line SL in the tracking step S620. That is, the mobility of the driving transistor DRT is proportional to the slope (Slope, SLP) of the voltage waveform of the sensing line SL in FIG. 6 .

The compensator COMP may compensate for a mobility deviation between driving transistors DRT by comparing the mobility of the corresponding driving transistor DRT with a reference mobility or mobility of other driving transistors DRT. Here, the mobility deviation compensation may mean image data change processing (an operation processing of multiplying image data by a compensation value (gain)).

7 is a diagram illustrating a sensing process that can be performed at various timings in the organic light emitting display device 100 according to embodiments of the present invention.

Referring to FIG. 7 , when the power-on signal PON is generated, the organic light-emitting display device 100 performs a predetermined on-sequence process for starting display driving, and when the on-sequence process is completed, normal display driving begins. It begins.

When the power off signal POFF is generated, the organic light emitting display device 100 stops display driving and performs a predetermined off sequence process. When the off sequence process is completed, the organic light emitting display device 100 enters a completely off state.

In relation to the power processing timing, sensing driving (threshold voltage sensing driving and mobility sensing driving) may be performed.

Sensing driving may be performed after generation of the power-on signal PON and before display driving starts. Such sensing and sensing processes are referred to as on-sensing and on-sensing processes.

Also, sensing driving may proceed after the power off signal POFF is generated. Such sensing and sensing processes are referred to as off-sensing and off-sensing processes.

Also, sensing driving may be performed in real time during display driving. Such a sensing processor is referred to as a real-time (RT) sensing process.

In the case of the RT sensing process, sensing driving may be performed for one or more subpixels SP in one or more subpixel lines (subpixel rows) for each blank time during display driving.

When sensing driving (RT sensing driving) is performed in the blank time, a subpixel line (subpixel row) on which sensing driving is performed may be randomly selected. Accordingly, an abnormal image phenomenon in a sub-pixel line subjected to sensing driving in an active time after sensing driving in a blank time may be alleviated. In addition, after the sensing drive in the blank time, the recovery data voltage corresponding to the data voltage before the sensing drive may be supplied to the subpixel that has been sensing driven in the active time. Accordingly, an abnormal image phenomenon in a sub-pixel line subjected to sensing driving in an active time after sensing driving in a blank time may be further alleviated.

Meanwhile, in the case of threshold voltage sensing driving, since it may take a long time to saturate the voltage of the second node N2 of the driving transistor DRT, an off-sensing process may be performed for a rather long time.

In the case of mobility sensing driving, since only a relatively short time is required compared to threshold voltage sensing driving, an on-sensing process and/or an RT sensing process may be performed for a short time.

Threshold voltage sensing and/or mobility sensing may be performed as an RT sensing process, but below, for convenience of description, it is assumed that mobility sensing is performed as an RT sensing process.

Meanwhile, in one subpixel SP having the structure shown in FIG. 3, one data voltage Vdata, two gate signals SCAN and SENSE, a reference voltage Vref, a driving voltage EVDD, and the like are applied. must be supplied Therefore, one subpixel (SP) should be electrically connected to one data line (DL), one or two gate lines (GL), one sensing line (SL), and one driving voltage line (DVL). (see FIGS. 3 and 4).

In order to turn on or off one subpixel row, one or two gate lines GL must be disposed for each subpixel row. However, below, for convenience of explanation, it is assumed that two gate lines GL are disposed in one subpixel row. According to this assumption, the scan signal SCAN and the sense signal SENSE may be respectively transferred through the two gate lines GL.

In addition, since the data voltage Vdata must be supplied to each subpixel SP, one data line DL can be disposed for each subpixel column. In some cases, one data line DL may be commonly arranged for every two subpixel columns.

Since the driving voltage EVDD may be a common voltage, one driving voltage line DVL may be disposed for each subpixel column (or one subpixel row), or two or more subpixel columns (or two subpixel rows). One driving voltage line (DVL) may be arranged for every subpixel column).

Similarly, since the reference voltage Vref may be a common voltage, one sensing line SL may be disposed for each subpixel column (or one subpixel row), and two or more subpixel columns (or One sensing line SL may be disposed for every two or more subpixel columns).

When one driving voltage line (DVL) and/or one sensing line (SL) is disposed for every two or more subpixel columns (or two or more subpixel columns), the aperture ratio of the display panel 110 can be further increased. can

For example, when the display panel 100 is composed of subpixels emitting four colors (red, green, blue, and white), one sensing line SL may be disposed in every four subpixel columns. there is. In this case, all subpixels included in the four subpixel columns may receive the reference voltage Vref from one sensing line SL or be sensed through one sensing line SL.

Below, in order to increase the aperture ratio of the display panel 110, one driving voltage line DVL is disposed parallel to the data line DL for every four or more subpixel columns, and one driving voltage line DVL is disposed in parallel with the data line DL for every four or more subpixel columns. A structure in which the two sensing lines SL are arranged in parallel with the data line DL will be described with reference to FIG. 8 .

FIG. 8 illustrates four sub-pixels SP1 to SP4 connectable to one first sensing line SP1 and their peripheral wires DL1 to DL4 in the organic light emitting display device 100 according to embodiments of the present invention. , DVL1, DVL2, SL1, GL1, GL2), and FIG. 9 is an equivalent circuit obtained by applying the subpixel structure of FIG. 3 and the sensing circuit 410 to the layout structure of FIG.

One subpixel row may include many subpixels, among which four subpixels SP1 to SP4 are electrically connected to the first sensing line SL1 as shown in FIGS. 8 and 9 . possible.

Each of the four subpixels SP1 to SP4 may mean a subpixel representing four subpixel columns. That is, the first subpixel SP1 represents the first subpixel column, the second subpixel SP2 represents the second subpixel column, and the third subpixel SP3 represents the third subpixel column. , and the fourth subpixel SP4 may represent the fourth subpixel column. Accordingly, the arrangement structure of FIGS. 8 and 9 may be extended and applied to the display panel 110 .

According to the example of FIG. 8 , a scan signal SCAN applied to the gate node of the first transistor T1 included in each of the four subpixels SP1 to SP4 and a scan signal applied to the gate node of the second transistor T2 It is assumed that the sense signals SENSE are separate gate signals.

Therefore, the gate line GL1 for transmitting the scan signal SCAN to each of the four subpixels SP1 to SP4 included in one subpixel row and the sense signal to each of the four subpixels SP1 to SP4 A gate line GL2 for transmitting (SENSE) may be disposed.

Four data lines DL1 to DL4 may be disposed on the display panel 110 to supply the data voltage Vdata to each of the four subpixels SP1 to SP4.

The first data line DL1 and the second data line DL2 may be positioned between the first subpixel SP1 and the second subpixel SP2. The third data line DL3 and the fourth data line DL4 may be positioned between the third subpixel SP3 and the fourth subpixel SP4.

In order to increase the aperture ratio of the display panel 110, the driving voltage lines DVL1 and DVL2 delivering the driving voltage EVDD that can be the common voltage and the first driving voltage lines DVL1 and DVL2 delivering the reference voltage Vref that can be the common voltage. The sensing line SL1 may be disposed in a shared structure.

That is, the driving voltage lines DVL1 and DVL2 may not be arranged one by one in each subpixel column, but one in each of a plurality of subpixel columns. The first sensing lines SL1 may not be disposed one by one in each subpixel column, but one in each of a plurality of subpixel columns.

More specifically, the first subpixel SP1 and the second subpixel SP2 may receive the driving voltage EVDD in common through the first driving voltage line DVL1. The third subpixel SP3 and the fourth subpixel SP4 may receive the driving voltage EVDD in common through the second driving voltage line DVL2 .

The source node or drain node of the second transistor T1 included in each of the first subpixel SP1 , the second subpixel SP2 , the third subpixel SP3 , and the fourth subpixel SP4 is a source node or a drain node of the first subpixel SP4 . It may be commonly connected to the sensing line SL1.

Accordingly, the first to fourth subpixels SP1 to SP4 may be commonly supplied with the reference voltage Vref through one first sensing line SL1.

Meanwhile, referring to FIGS. 8 and 9 , for example, one first sensing line SL1 may be disposed between the second subpixel SP2 and the third subpixel SP3. In this case, the first subpixel SP1 and the fourth subpixel SP4 may be connected to one first sensing line SL1 through a connection line CL. Here, the connection line CL may be integral with the first sensing line SL1, or may be located on a different layer from the first sensing line SL1 to make contact with it.

Meanwhile, the data lines DL1 to DL4 may be symmetrically disposed with respect to one first sensing line SL1. The driving voltage lines DVL1 and DVL2 may be symmetrically disposed with respect to one first sensing line SL1.

Referring to FIGS. 8 and 9 , the sensing circuit 410 may be connected to one first sensing line SL1. Accordingly, at one point in time, only one subpixel among the four subpixels SP1 to SP4 may be sensed.

FIG. 10 is a diagram showing driving operation timing of the organic light emitting display device 100 according to example embodiments of the present invention.

Referring to FIG. 10 , mobility sensing may be an on-sensing process performed after the power-on signal PON is generated and before image display starts. In addition, the mobility sensing may be a real-time sensing process performed in real time (RT) while the image display is driven after the image display starts. Threshold voltage sensing may be an off-sensing process performed after the power off signal POFF is generated.

Mobility sensing performed as an on-sensing process may be reference mobility sensing.

The sensing value for each subpixel obtained through the mobility sensing performed in the on-sensing process may be a reference sensing value serving as a reference for the sensing value for each subpixel obtained through the mobility sensing performed in the real-time sensing process.

Sensed values for each subpixel obtained through mobility sensing performed as an on-sensing process may be included in a lookup table (LUT) and stored in the memory MEM.

The sensing values for each subpixel obtained through the mobility sensing performed in the real-time sensing process may be distributed based on the sensing values (reference sensing values) for each subpixel obtained through the mobility sensing performed in the on-sensing process.

The sensing value for each subpixel obtained through the mobility sensing performed in the real-time sensing process is compared with the sensing value for each subpixel (reference sensing value) obtained through the mobility sensing performed in the on-sensing process, and the movement of each subpixel is performed. It can also be a compensation process (image data change process).

Below, it is assumed that the on-sensing process is reference mobility sensing, the real-time sensing process is mobility sensing, and the off-sensing process is threshold voltage sensing.

11 is a diagram illustrating a display on-time (TLon) required to start displaying an image after a power-on signal (PON) is generated in an organic light emitting display device 100 according to embodiments of the present invention.

Referring to FIG. 11 , when the organic light emitting display device 100 generates a power on signal PON, it may take a considerable amount of time TLon until the organic light emitting display device 100 starts displaying an image. Here, the power-on signal PON may be generated as a user manipulates a remote control or a power button, for example.

Referring to FIG. 11 , when the power-on signal PON is generated in the organic light emitting display device 100, the organic light emitting display device 100 performs, for example, an on-sensing process such as reference mobility sensing, An on-sequence for driving the image display may be performed. Here, the on-sequence may include a process of loading various types of power necessary for driving an image display or a process of loading various memories.

The reference mobility sensing may take a very long time because it is necessary to obtain reference sensing values for all subpixels SP arranged on the display panel 110 .

For example, 4*3840*2160 subpixels (SP) are arranged in 4x3840 rows and 2160 columns on the display panel 110 according to a predetermined resolution, and one sensing line (SL) is provided for every four subpixel columns. Assume this is placed. According to this, 3840 sensing lines SL are disposed on the display panel 110 . The time taken to sense all 4*3840*2160 subpixels (SP) arranged on the display panel 110 is 4*2160*Tsen [sec]. Here, Tsen [sec] is the time taken to sense one subpixel (SP).

As such, the reference mobility sensing performed after the power-on signal PON is generated and before image display starts may take several minutes or more. In addition, the on-sequence before and after the reference mobility sensing should also be performed.

Therefore, after the power-on signal PON is generated, it may take a considerably long time TLon until the image display starts due to the reference mobility sensing and on-sequence required before the image display starts.

Here, the time TLon from the generation time Tpon of the power-on signal PON to the start time Tdon of the image display is the time taken to start displaying the image after the power-on signal PON is generated. It is called Display On-Time (TLon).

Meanwhile, the mobility of the driving transistor DRT is a component that is very sensitively affected by temperature. Therefore, in order to accurately sense and accurately compensate for the mobility or change thereof of the driving transistor DRT, when sensing the reference mobility, it is necessary to obtain a reference sensing value in which the influence of the ambient temperature (current temperature) is reflected. .

If a sensing value is obtained while driving an image display in a situation where a reference sensing value reflecting the current temperature is not accurately obtained, the sensing value obtained at this time may be an erroneous sensing value.

In consideration of the foregoing, embodiments of the present invention reduce the display on-time (TLon) from when the power-on signal (PON) is generated until the image display starts, while accurately sensing and compensating for mobility according to temperature. You can provide a method that allows processing to take place.

FIG. 12 is a conceptual diagram for explaining an operating method in which the organic light emitting display device 100 according to embodiments of the present invention can reduce the display on-time while providing accurate sensing and compensation suitable for ambient temperature.

Referring to FIG. 12 , the organic light emitting display device 100 according to embodiments of the present invention provides accurate sensing and compensation suitable for the ambient temperature, while shortening the display on-time, a temperature sensor (T/ S), and a memory MEM for storing a look-up table (LUT) for each temperature.

For example, the temperature sensor (T / S) may be disposed on the source printed circuit board (SPCB), may be disposed on the control printed circuit board (CPCB), depending on the case, the circuit film (SF, GF) or It may also be disposed on the display panel 110 . In addition, the temperature sensor (T/S) may be implemented by being included in an integrated circuit such as a source driver integrated circuit (SDIC).

The location where the temperature sensor T/S is disposed may be a location that can best reflect the temperature change of the display panel 110 or a location where the temperature change of the display panel 110 is most extreme.

In addition, the number of temperature sensors (T/S) may be 1 or plural. When there are a plurality of temperature sensors (T/S), the plurality of temperature sensors (T/S) may be all disposed in the same place (eg, SPCB, CPCB, display panel, etc.) or may be disposed in different places.

For example, the lookup table LUT for each temperature stored in the memory MEM includes a lookup table LUT corresponding to the first temperature, a lookup table LUT corresponding to the second temperature Td, and a third lookup table LUT corresponding to the second temperature Td. Assuming that a lookup table (LUT) corresponding to temperature is included, each of the first temperature, the second temperature (Td), and the third temperature may be a specific temperature value that is distinct from each other, or a specific temperature that is distinct from each other. may be a range.

When shipped from the factory (product shipment), the memory (MEM) may be in a state in which the lookup table (LUT) for each temperature is not stored at all.

Alternatively, when shipped from the factory, the memory MEM may store a lookup table LUT corresponding to each of the three reference temperatures. That is, the look-up table LUT for each temperature first stored in the memory MEM may include a look-up table LUT corresponding to each of the three reference temperatures.

Here, the three reference temperatures are low-temperature reference temperatures (eg, O˚C, -5˚C to +5˚C, etc.), room temperature reference temperatures (eg, 25˚C, 20˚C to 30˚C, etc.) and You can include hot reference temperatures (e.g. 60˚C, 50˚C to 70˚C, etc.).

A temperature described herein may mean a temperature value, but may also mean a temperature range.

The temperature sensor T/S may measure the ambient temperature Ts.

After the power-on signal PON is generated, the controller 140 may control the start time point Tdon of displaying an image on the display panel 110 according to the temperature Ts measured by the temperature sensor T/S. there is.

For example, the controller 140 determines the generation time point Tpon of the power-on signal PON according to the temperature Ts measured by the temperature sensor T/S after the power-on signal PON is generated. It is possible to control the process so that it proceeds differently between the video display start point Tdon.

As a more specific example, the controller 140 determines whether or not the lookup table LUT corresponding to the temperature Ts measured by the temperature sensor T/S is pre-stored in the memory MEM, and the determination result Accordingly, it is possible to control the process to proceed differently between the generation time Tpon of the power-on signal PON and the image display start time Tdon.

When the look-up table (LUT) corresponding to the temperature (Ts) measured by the temperature sensor (T/S) is stored in the memory (MEM), the controller 140 controls the image display without performing reference mobility sensing. can do. Accordingly, the display on-time TLon may be shortened.

When the lookup table (LUT) corresponding to the temperature (Ts) measured by the temperature sensor (T/S) is not stored in the memory (MEM), the controller 140 proceeds with reference mobility sensing to obtain a temperature sensor (T A look-up table (LUT) corresponding to the temperature (Ts) measured at /S) is newly generated, stored in the memory (MEM), and controlled to display an image. Accordingly, the display on-time TLon may be increased.

However, when the next power-on signal PON occurs, if the temperature Ts is measured as the same or similar, the look-up table LUT corresponding to the temperature Ts measured by the temperature sensor T/S is stored in the memory MEM. ), image display drive can be immediately and quickly performed without sensing the reference movement. Accordingly, the display on-time TLon may be shortened.

In this specification, even if two temperatures are the same, even if they are not completely the same, if the two temperatures are the same to the first or second decimal place, the two temperatures can be considered to be the same. Also, even if the two temperatures are not completely identical, if the difference between the two temperatures falls within a certain range (e.g., 1˚C, 2˚C, or 5˚C), the two temperatures can be considered equal. . Also, even if the two temperatures are not completely identical, the two temperatures are within the same temperature range (eg, 24˚C to 26˚C, 23˚C to 27˚C, or 20˚C to 30˚C). If they are temperatures, two temperatures can be considered equal.

As described above, when the lookup table (LUT) corresponding to the temperature (Ts) measured by the temperature sensor (T/S) is already stored in the memory (MEM) in a situation where the power-on signal (PON) is generated, power-on The time interval TLon between the signal PON generation time Tpon and the image display start time Tdon is the temperature Ts measured by the temperature sensor T/S when the power-on signal PON is generated. ) If the lookup table (LUT) corresponding to is not stored in the memory (MEM), it may be shorter than the time interval (TLon) between the generation time (Tpon) of the power-on signal (PON) and the start time (Tdon) of the image display. there is.

13 and 14 are flowcharts of a driving method of the organic light emitting display device 100 according to example embodiments.

Referring to FIG. 13 , a method of driving an organic light emitting display device 100 according to embodiments of the present invention includes detecting generation of a power-on signal PON (S1310) and measuring ambient temperature. (S1320) and controlling the start time Tdon of displaying the image on the display panel 110 according to the measured temperature Ts (S1330).

In step S1330, the organic light emitting display device 100 controls the process to proceed differently between the generation time Tpon of the power-on signal PON and the image display start time Tdon according to the measured temperature Ts. can do.

Referring to FIG. 14, step S1330 includes determining whether or not the lookup table (LUT) corresponding to the measured temperature (Ts) is stored in the memory (MEM) (S1410), and the determination result, the measured temperature ( If it is determined that the look-up table (LUT) corresponding to Ts) is stored in the memory (MEM), the look-up table (LUT) previously stored in the memory (MEM) and corresponding to the temperature (Ts) measured in step S1320 is referred to In the step of driving the image display (S1420), and as a result of the determination, if it is determined that the lookup table (LUT) corresponding to the measured temperature (Ts) is not stored in the memory (MEM), each of a plurality of subpixels (SP) A reference sensing drive is performed for the reference sensing drive, and a lookup table (LUT) corresponding to the temperature (Ts) measured in step S1320 including a reference sensing value for each of a plurality of subpixels (SP) according to the progress result of the reference sensing drive is generated. Step of newly generating and storing in the memory (MEM) (S1430), and proceeding with image display driving with reference to the lookup table (LUT) corresponding to the measured temperature (Ts) that is newly created and stored in the memory (MEM) ( S1440) and the like.

As described above, if there is a lookup table (LUT) corresponding to the temperature (Ts) measured in step S1320, since the image can be displayed immediately without reference sensing, the display on-time (TLon) is greatly reduced can make it

In addition, the organic light emitting display device 100 may perform mobility compensation by performing change processing of image data by referring to the lookup table LUT corresponding to the measured temperature Ts. In addition, the organic light emitting display device 100 refers to the lookup table (LUT) corresponding to the measured temperature (Ts) and performs mobility sensing in real time during image display driving, and the resultant sensing value and the lookup table Mobility compensation can be performed more precisely in real time by comparing reference sensing values on the (LUT).

15 illustrates a method of reducing the display-on time TLon when a lookup table LUT_Ta corresponding to the measured temperature Ta exists in the organic light emitting display device 100 according to embodiments of the present invention. 16 is a conceptual diagram illustrating a next power-on signal ( It is a conceptual diagram showing a method for shortening the display-on time (TLon) when PON) occurs. FIG. 17 is a diagram for explaining an effect of reducing the display on-time TLon of the organic light emitting display device 100 according to example embodiments.

Referring to FIG. 15 , the controller 140, after generating the power-on signal PON, when the temperature Ts measured by the temperature sensor T/S is the first temperature Ta, the power-on signal ( It is possible to control an image to be displayed on the display panel 110 after the first processing period from the time point Tpon of occurrence of PON.

Referring to FIG. 16 , the controller 140 determines that, after the power-on signal PON is generated, the temperature Ts measured by the temperature sensor T/S is different from the first temperature Ta and the second temperature Td. ), it is possible to control an image to be displayed on the display panel 110 after the second processing period from the generation time Tpon of the power-on signal PON.

The above-mentioned first processing period and second processing period correspond to the display-on time TLon for each case when the temperature Ts measured after the power-on signal PON is generated is different from each other.

When the temperature Ts measured by the temperature sensor T/S is the first temperature Ta, the first processing period corresponding to the display on time TLon does not include the sensing driving period (reference mobility sensing time). don't

Alternatively, when the temperature Ts measured by the temperature sensor T/S is the second temperature Td, the second processing period corresponding to the display on time TLon is a sensing driving period (reference mobility sensing time). can include

Accordingly, as shown in FIG. 17 , when the temperature Ts measured by the temperature sensor T/S is the second temperature Td (Case A), the second processing period corresponds to the display on time TLon. , when the temperature Ts measured by the temperature sensor T/S is the first temperature Ta (Case B), it may be longer than the first processing period corresponding to the display-on time TLon.

Conversely, when the temperature Ts measured by the temperature sensor T/S is the first temperature Ta (Case B), the first processing period corresponding to the display-on time TLon is performed by the temperature sensor T When the temperature Ts measured at /S) is the second temperature Td (Case A), the display-on time TLon may be significantly shorter than the second processing period.

This means that when the temperature Ts measured by the temperature sensor T/S is the first temperature Ta (Case B), the reference mobility sensing drive is performed after the power-on signal PON is generated (Tpon). This is because the video display drive starts without progress.

As described above, each of the plurality of subpixels SP includes an organic light emitting diode OLED, a driving transistor DRT for driving the organic light emitting diode OLED, and a first node N1 of the driving transistor DRT. ) between the first transistor T1 for transferring the image driving or sensing driving data voltage Vdata and the first node N1 and the second node N2 of the driving transistor DRT. A connected storage capacitor (Cst) and the like may be basically included.

As described above, the memory MEM may store a lookup table LUT for each temperature.

For example, according to the examples of FIGS. 15 and 16 , before the power-on signal PON is generated, the memory MEM generates lookup tables LUT_Ta and LUT_Tb corresponding to three temperatures Ta, Tb, and Tc, respectively. , LUT_Tc) may be stored in advance.

Meanwhile, as shown in FIG. 15, when the temperature Ts measured by the temperature sensor T/S after the power-on signal PON is generated is the first temperature Ta, and as shown in FIG. 16, A case where the temperature Ts measured by the temperature sensor T/S after the power-on signal PON is generated is the second temperature Tb will be exemplarily described.

15 and 16, before the power-on signal PON is generated, the memory MEM generates lookup tables LUT_Ta, LUT_Tb, and LUT_Tc corresponding to the three temperatures Ta, Tb, and Tc, respectively. is stored in advance, and the lookup tables (LUT_Ta, LUT_Tb, LUT_Tc) corresponding to each of the three temperatures (Ta, Tb, Tc) include a lookup table (LUT_Ta) corresponding to the first temperature (Ta), 2 It is assumed that the lookup table (LUT_Td) corresponding to the temperature (Td) is not included.

That is, before the power-on signal PON is generated, the memory MEM pre-stores the look-up table LUT corresponding to the first temperature Ta, and the look-up table LUT corresponding to the second temperature Td ) is not saved.

The look-up table LUT corresponding to the first temperature Ta is used to sense the characteristic value or characteristic value change of the driving transistor DRT included in each of the plurality of subpixels SP under the condition of the first temperature Ta. It may include a sensing value for

Here, the sensed value included in the lookup table LUT is converted into a digital value by sensing the voltage of the sensing line SL in order to sense the mobility or mobility change of the driving transistor DRT obtained through the reference mobility sensing. It may be a converted sensing value.

In addition, the sensing values included in the lookup table (LUT) may be reference sensing values corresponding to reference values compared with sensing values obtained through mobility sensing performed as a real-time sensing process during image display driving (image driving). there is.

Meanwhile, referring to FIG. 15 , when the temperature Ts measured by the temperature sensor T/S is the first temperature Ta after the power-on signal PON is generated, it corresponds to the first temperature Ta. Since the lookup table (LUT_Ta) to be is stored in the memory (MEM), the reference sensing drive for generating the lookup table (LUT_Td) by obtaining reference sensing values does not need to be performed within the first processing period.

Therefore, when the temperature Ts measured by the temperature sensor T/S is the first temperature Ta after the power-on signal PON is generated, the first processing period corresponding to the display-on time TLon, Since it does not include a reference sensing driving period (eg, a reference mobility sensing driving period) for sensing a characteristic value or a characteristic value change of the driving transistor DRT included in each of the plurality of subpixels SP, it may be shortened. there is.

Referring to FIG. 15 , the controller 140 searches the lookup tables (LUT_Ta, LUT_Tb, and LUT_Tc) for each temperature pre-stored in the memory (MEM) to obtain an ambient temperature corresponding to the ambient temperature measured after the power-on signal PON is generated. A lookup table (LUT_Ta) corresponding to the first temperature (Ta) is selected (S1410).

Accordingly, the controller 140 uses the lookup table LUT_Ta corresponding to the first temperature Ta to change image data for image display driving (mobility compensation processing) while performing image display driving proceed with

In addition, the controller 140 performs real-time sensing driving at each blank time during image display driving to obtain sensing values for each of the plurality of subpixels SP from the sensing circuit 410 .

The controller 140 compares the obtained sensing values for each of the plurality of subpixels SP with reference sensing values included in the lookup table LUT_Ta corresponding to the previously prepared first temperature Ta, and compares the characteristic values It is possible to perform change processing (compensation processing) on image data for driving the image display by grasping the change (change in mobility).

Meanwhile, referring to FIG. 16 , when the temperature Ts measured by the temperature sensor T/S is the second temperature Td after the power-on signal PON is generated, it corresponds to the second temperature Td. Since the lookup table LUT_Td to be used is not stored in the memory MEM, reference sensing driving to generate the lookup table LUT_Td by obtaining reference sensing values must be performed within the second processing period.

According to this, when the temperature Ts measured by the temperature sensor T/S is the second temperature Td, the second processing period corresponding to the display on time TLon has a number of A reference sensing driving period (eg, a reference mobility sensing driving period) for sensing a characteristic value or a characteristic value change of the driving transistor DRT included in each subpixel SP may be further included.

Referring to FIG. 16 , the controller 140 searches the look-up tables (LUT_Ta, LUT_Tb, and LUT_Tc) for each temperature pre-stored in the memory (MEM) to obtain an ambient temperature corresponding to the ambient temperature measured after the power-on signal PON is generated. It is determined that the lookup table LUT_Td corresponding to the second temperature Td does not exist (S1410).

Accordingly, the controller 140 controls the operation of the data driving circuit 120, the gate driving circuit 130, and the sensing circuit 410 to control the reference sensing driving to proceed, and controls a plurality of data from the sensing circuit 410. A reference sensing value for each subpixel (SP) of is obtained.

The controller 140 may newly generate a lookup table LUT_Td corresponding to the second temperature Td including reference sensing values for each of the plurality of subpixels SP and store the result in the memory MEM. (S1430).

Thereafter, the controller 140 performs processing (mobility compensation processing) of changing image data for image display driving using the lookup table LUT_Td corresponding to the second temperature Td, while performing image display driving. proceed

In addition, the controller 140 performs real-time sensing driving at each blank time during image display driving to obtain sensing values for each of the plurality of subpixels SP from the sensing circuit 410 .

The controller 140 compares the obtained sensing values for each of the plurality of subpixels SP with reference sensing values included in the lookup table LUT_Td corresponding to the newly generated second temperature Td, and changes the characteristic value. (Mobility change) can be identified to perform change processing (compensation processing) on image data for image display driving.

When the temperature Ts measured by the temperature sensor T/S is the second temperature Td, the reference sensing driving performed during the second processing period corresponding to the display on time TLon may be the mobility sensing driving. .

For example, when the temperature Ts measured by the temperature sensor T/S is the second temperature Td, the reference sensing driving period during the second processing period corresponding to the display on time TLon is A first reference sensing driving period for one subpixel SP1 and a second reference sensing driving period for a second subpixel SP2 different from the first subpixel SP1 may be included.

Each of the first reference sensing driving and the second reference sensing driving may be performed according to the driving timing of FIG. 6 when the subpixel structure and compensation circuit are the same as those of FIG. 4 .

That is, in each of the first reference sensing driving period and the second reference sensing driving period, the sensing driving data voltage Vdata_sen is applied to the first node N1 of the driving transistor DRT, and the driving transistor DRT 2 A period of applying the reference voltage VpreS for sensing driving to the node N2 (S610), a period of increasing the voltage of the second node N2 of the driving transistor DRT (S620), and a period of increasing the driving transistor DRT. ) may include a period of sensing the voltage of the second node N2 (S630), and the like.

When the mobility of the driving transistor DRT included in the first subpixel SP1 and the mobility of the driving transistor DRT included in the second subpixel SP2 are different from each other, the The voltage rising speed of the second node N2 of the driving transistor DRT (the voltage rising speed of the corresponding sensing line SL, the slope SLP in FIG. 6 ) and the driving included in the second subpixel SP2 The voltage rising speed of the second node N2 of the transistor DRT (the voltage rising speed of the corresponding sensing line SL, the slope SLP in FIG. 6 ) may be different from each other.

As described above, when the temperature Ts measured by the temperature sensor T/S is the second temperature Td after the power-on signal PON is generated, the controller 140 starts displaying the image. Refer to a lookup table (LUT_Td) corresponding to the second temperature (Td) newly generated during the reference sensing driving period in the second processing period and stored in the memory (MEM) before, Image data for image display can be changed and output. there is.

As described above, the controller 140 controls the first temperature Ta when the temperature Ts measured by the temperature sensor T/S is the first temperature Ta after the power-on signal PON is generated. ), the organic light emitting display device 100 changes and outputs image data for image display by referring to a lookup table (LUT_Ta) corresponding to .

Here, the lookup table LUT_Ta corresponding to the first temperature Ta is newly generated when the previous power-on signal PON that occurred before the current power-on signal PON is generated, or product shipment It may have been stored before.

In both cases of FIGS. 15 and 16 , after an image is displayed on the display panel 110 , sensing driving for one or more subpixels SP may be performed at each blank time.

In this way, the controller 140, when the sensing value is obtained through the sensing drive that proceeds in real time, the look-up table LUT_Ta corresponding to the first temperature Ta or the look-up table corresponding to the second temperature Td ( LUT_Td), compensation processing may be performed.

Below, functions performed by the controller 140 among the driving methods described above will be briefly described again.

18 is a block diagram of the controller 140 of the organic light emitting display device 100 according to example embodiments.

Referring to FIG. 18 , a controller 140 of an organic light emitting display device 100 according to embodiments of the present invention includes a display panel 110, a data driving circuit 120, and a gate driving circuit 130. A device that controls the driving operation of the organic light emitting display device 100 as a whole.

Referring to FIG. 18 , the controller 140 of the organic light emitting display device 100 according to embodiments of the present invention includes a detector 1410 that detects generation of a power-on signal PON, and a power-on signal ( a temperature measurement unit 1420 that measures a temperature Ts within the organic light emitting display device 100 through a temperature sensor T/S included in the organic light emitting display device 100 when generation of PON is detected; An image display start control unit 1830 or the like that controls an image display start point Tdon on the display panel 110 according to the measured temperature Ts may be included.

The image display start control unit 1830 determines the generation time point Tpon of the power-on signal PON and the start of image display according to the temperature Ts measured by the temperature measuring unit 1420 through the temperature sensor T/S. It is possible to control the process so that it proceeds differently between the points in time Tdon.

Referring to FIG. 18 , the controller 140 of the organic light emitting display device 100 according to example embodiments may further include a memory MEM that stores a lookup table LUT for each temperature.

The image display start control unit 1830 of the controller 140 may determine whether or not the lookup table (LUT) corresponding to the measured temperature (Ts) is stored in the memory (MEM), and according to the determination result, power The process may be controlled to proceed differently between the generation time Tpon of the on signal PON and the start time Tdon of the image display.

The video display start control unit 1830 of the controller 140 determines whether or not the lookup table (LUT) corresponding to the measured temperature (Ts) is stored in the memory (MEM), and as a result of the determination, the measured temperature (Ts) ) If it is determined that the look-up table (LUT) corresponding to the memory (MEM) is stored in the memory (MEM), the image display drive can be performed by referring to the look-up table (LUT) corresponding to the measured temperature (Ts) previously stored in the memory (MEM) there is.

The video display start control unit 1830 of the controller 140 determines whether or not the lookup table (LUT) corresponding to the measured temperature (Ts) is stored in the memory (MEM), and as a result of the determination, the measured temperature (Ts) ), if it is determined that the lookup table (LUT) corresponding to is not stored in the memory (MEM), a reference sensing drive is performed for each of a plurality of subpixels (SP), and a plurality of subpixels according to the progress result of the reference sensing drive (SP) A look-up table (LUT) corresponding to the measured temperature (Ts) including the reference sensing value for each is newly created and stored in the memory (MEM), and the newly created and stored measured temperature in the memory (MEM) Image display driving may be performed by referring to the lookup table (LUT) corresponding to (Ts).

When the lookup table (LUT) corresponding to the measured temperature (Ts) is stored in the memory (MEM) (Case B), the time between the generation time (Tpon) of the power-on signal (PON) and the start time (Tdon) of the image display The interval (TLon) is, when the look-up table (LUT) corresponding to the measured temperature (Ts) is not stored in the memory (MEM) (Case A), the generation time (Tpon) of the power-on signal (PON) and the start of image display It may be shorter than the time interval TLon between time points Tdon.

According to the embodiments of the present invention described above, good image quality can be provided even when the ambient temperature changes.

According to embodiments of the present invention, a phenomenon in which image display starts too late due to an operation (reference sensing drive) that takes a long time and is required to acquire a reference sensing value before video display starts after video display starts is mitigated. By doing so, the time from when the power-on signal PON is generated to when the image display starts can be reduced as much as possible.

According to the embodiments of the present invention, it is possible to shorten the time required to start displaying an image after power is turned on while improving image quality by providing a driving operation suitable for a temperature.

According to embodiments of the present invention, a look-up table (LUT) for each temperature including a reference sensing value serving as a basis for compensation is stored in advance, and image display driving and real-time sensing driving (sensing driving during video display driving) are performed using the stored look-up table (LUT) for each temperature. By performing, image display and compensation processing suitable for the current ambient temperature can be provided.

According to the embodiments of the present invention, it is possible to compensate for characteristic values of circuit elements within a sub-pixel while enabling an image to be quickly displayed after power is turned on, while driving an image display.

The above description and accompanying drawings are merely illustrative of the technical idea of the present invention, and those skilled in the art can combine the configuration within the scope not departing from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: organic light emitting display device
110: display panel
120: data driving circuit
130: gate driving circuit
140: controller

Claims (20)

a display panel on which a plurality of data lines and a plurality of gate lines are disposed, and a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged;
a data driving circuit for driving the plurality of data lines;
a gate driving circuit for driving the plurality of gate lines;
a controller controlling the data driving circuit and the gate driving circuit;
a memory to store a lookup table for each temperature; and
Including a temperature sensor for measuring the ambient temperature,
The controller controls the process to proceed differently between the time when the power-on signal is generated and the time when the image display on the display panel starts, depending on whether or not a look-up table corresponding to the measured temperature is stored in the memory. light emitting display.
delete delete According to claim 1,
When the look-up table corresponding to the measured temperature is stored in the memory, the time interval between the generation of the power-on signal and the start of the image display is
The organic light emitting display device of claim 1 , wherein a time interval between a time when the power-on signal is generated and a time when the image display starts is shorter when the look-up table corresponding to the measured temperature is not stored in the memory.
According to claim 1,
The controller,
After the power-on signal is generated,
When the measured temperature is a first temperature, controlling an image to be displayed on the display panel after a first processing period from the time when the power-on signal is generated;
When the measured temperature is a second temperature different from the first temperature, controlling an image to be displayed on the display panel after a second processing period from the time when the power-on signal is generated;
The second processing period is longer than the first processing period.
According to claim 5,
Each of the plurality of subpixels,
An organic light emitting diode, a driving transistor for driving the organic light emitting diode, a first transistor for transferring a data voltage to a first node of the driving transistor, and an electrical connection between the first node and the second node of the driving transistor. Including a storage capacitor connected to,
Before the power-on signal is generated, the memory,
A look-up table corresponding to the first temperature is stored in advance, and a look-up table corresponding to the second temperature is not stored;
The lookup table corresponding to the first temperature,
The organic light emitting display device includes, as a reference sensing value, a sensing value for sensing a characteristic value or a characteristic value change of a driving transistor included in each of the plurality of subpixels under the condition of the first temperature.
According to claim 6,
The second processing period,
Compared to the first processing period, a reference sensing driving period for sensing a characteristic value or a change in characteristic value of a driving transistor included in each of the plurality of subpixels is further included,
The controller,
After the reference sensing driving period has elapsed, a lookup table corresponding to the second temperature is newly generated and stored in the memory.
According to claim 7,
The reference sensing driving period,
A first reference sensing drive period for a first subpixel and a second reference sensing drive period for a second subpixel different from the first subpixel;
Each of the first reference sensing driving period and the second reference sensing driving period,
a period of applying a data voltage for sensing driving to a first node of the driving transistor and applying a reference voltage for sensing driving to a second node of the driving transistor;
a period in which the voltage of the second node of the driving transistor rises;
and a period of sensing a voltage of a second node of the driving transistor.
According to claim 8,
The organic light emitting display device of claim 1 , wherein a voltage rising speed of a second node of a driving transistor included in the first subpixel is different from a voltage rising speed of a second node of a driving transistor included in the second subpixel.
According to claim 7,
The controller,
When the measured temperature is the second temperature, image data for displaying an image is obtained by referring to a lookup table for the second temperature newly generated during the reference sensing driving period in the second processing period and stored in the memory. An organic light emitting display device that changes and outputs.
According to claim 6,
The controller,
When the measured temperature is the first temperature, the organic light emitting display device changes and outputs image data for displaying an image with reference to a lookup table corresponding to the first temperature.
According to claim 6,
The lookup table for each temperature first stored in the memory,
An organic light emitting display device including a lookup table corresponding to each of three reference temperatures.
A display panel on which a plurality of data lines and a plurality of gate lines are disposed and a plurality of subpixels defined by the plurality of data lines and the plurality of gate lines are arranged; and a data driving circuit for driving the plurality of data lines. and a gate driving circuit for driving the plurality of gate lines, and a controller for controlling the data driving circuit and the gate driving circuit.
detecting generation of a power-on signal;
measuring the ambient temperature; and
determining whether a lookup table corresponding to the measured temperature is stored in a memory;
and controlling a process to proceed differently between a time when the power-on signal is generated and a time when an image display on the display panel starts, according to the determination result.
delete According to claim 13,
The control step is
If it is determined that the look-up table corresponding to the measured temperature is stored in the memory as a result of the determination, proceeding with image display driving by referring to the look-up table corresponding to the measured temperature stored in the memory;
As a result of the determination, when it is determined that the look-up table corresponding to the measured temperature is not stored in the memory, reference sensing driving is performed for each of the plurality of subpixels, and according to the progress result of the reference sensing driving, the plurality of generating a new look-up table corresponding to the measured temperature including reference sensing values for each sub-pixel and storing the look-up table in the memory; and
and performing image display driving by referring to the look-up table corresponding to the measured temperature that is newly generated and stored in the memory.
A controller for an organic light emitting display device including a display panel, a data driving circuit, and a gate driving circuit,
a detector detecting generation of a power-on signal;
a temperature measuring unit configured to measure a temperature within the organic light emitting display device through a temperature sensor included in the organic light emitting display device when generation of the power-on signal is detected;
a memory to store a lookup table for each temperature; and
Determine whether or not a lookup table corresponding to the measured temperature is stored in the memory, and according to the determination result, a process proceeds differently between the time when the power-on signal is generated and the time when the image display on the display panel starts A controller including an image display start controller for controlling.
delete delete According to claim 16,
The video display start control unit,
When it is determined that the look-up table corresponding to the measured temperature is stored in the memory, an image display drive is performed by referring to the look-up table corresponding to the measured temperature pre-stored in the memory;
When it is determined that the lookup table corresponding to the measured temperature is not stored in the memory, a reference sensing drive for each of a plurality of subpixels is performed, and according to a result of the progress of the reference sensing drive, a reference sensing drive for each of the plurality of subpixels is performed. A look-up table corresponding to the measured temperature including a reference sensing value is newly generated and stored in the memory, and an image display drive is performed with reference to the look-up table corresponding to the measured temperature newly created and stored in the memory. controller to do.
According to claim 16,
When the look-up table corresponding to the measured temperature is stored in the memory, the time interval between the generation of the power-on signal and the start of the image display is
When a lookup table corresponding to the measured temperature is not stored in the memory, the controller is shorter than a time interval between a time when the power-on signal is generated and a time when the image display starts.

Images