KR102366285B1 - Organic light emitting display device and method for driving the same - Google Patents

Abstract

The organic light emitting diode display device of the present invention includes a display panel, a source driver, a scan driver, and a controller, and each subpixel of the display panel includes each subpixel disposed on an n+1 (n is an integer greater than or equal to 0)-th subpixel line. The gate node of the sensing transistor in the pixel and the gate node of the sensing transistor in each subpixel disposed on the n+2th subpixel line are connected to the same k+1th sensing signal line (k is an integer greater than or equal to 0), so that each subpixel There is an effect to increase the aperture ratio of the pixel and to increase the lifespan of the organic light emitting diode.
Also, in the method of driving an organic light emitting display device of the present invention, when the display panel is a blank section of an odd-numbered image frame, the first scan signal and the second scan signal are sequentially applied to the n+1th subpixel line and the n+2th subpixel line By supplying a 2 scan signal, sensing a subpixel of an n+1th subpixel line according to a first scan signal, and supplying a black data voltage to a subpixel of an n+2th subpixel line according to a second scan signal , to increase the aperture ratio of each sub-pixel and increase the lifespan of the organic light emitting diode.

Description

Organic light emitting display device and driving method thereof

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

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

In such an organic light emitting display device, subpixels including organic light emitting diodes are arranged in a matrix form, and the brightness of the subpixels selected by a scan signal is controlled according to a gray level of data.

Each sub-pixel disposed on the display panel of the organic light emitting diode display basically includes a driving transistor for driving an organic light emitting diode, a switching transistor for transferring a data voltage to a gate node of the driving transistor, and maintaining a constant voltage for one frame time. It may be configured to include a storage capacitor, etc., which serves to serve.

The driving transistor in each sub-pixel may be deteriorated as the driving time increases, and thus characteristic values such as threshold voltage and mobility may change. Also, since the degree of deterioration may be different for each driving transistor, a characteristic value deviation between driving transistors in each subpixel may occur.

As described above, the deviation of the characteristic value between the sub-pixels caused by the deviation of the characteristic value between the driving transistors may cause a luminance deviation between the sub-pixels, which may cause a screen abnormality such as a screen afterimage or the luminance unevenness of the display panel.

Accordingly, a technology for compensating for a characteristic value deviation between sub-pixels has been developed. In the compensation method, first, the organic light emitting diode display is sensed and driven to sense the characteristic value of the driving transistor or the organic light emitting diode of the subpixel, and then the sensed value Vsen is obtained, and data to be applied to the subpixel based on the sensed value Vsen. This is done in a way that compensates for

As described above, in order to compensate for the characteristic value deviation between sub-pixels, a sensing transistor capable of sensing the characteristic value deviation and a sensing signal line SL for operating the sensing transistor should be additionally disposed in each sub-pixel.

As such, when the sensing transistor and the sensing signal line are additionally disposed, there is a problem in that the non-emitting area (NEA) of each sub-pixel is widened and the emitting area (EA) is relatively reduced.

In addition, when the light emitting area EA of the sub-pixel is reduced, since the size of the organic light emitting diode must be reduced, the lifespan of the organic light emitting diode is shortened.

According to the present invention, by arranging one sensing signal line commonly connected to the n+1th subpixel line and the n+2th subpixel line adjacent to the subpixels disposed on the display panel, the aperture ratio of each subpixel is increased. It is an object of the present invention to provide an organic light emitting display device and a driving method for increasing the lifespan of the organic light emitting diode.

An organic light emitting diode display device of the present invention for solving the problems of the prior art as described above includes a display panel in which a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines are arranged, and a plurality of data lines for driving the plurality of data lines. It includes a source driver, a scan driver for driving a plurality of gate lines, and a controller for controlling the source driver and the scan driver.

In addition, each subpixel of the display panel receives an organic light emitting diode, a driving transistor for driving the organic light emitting diode, and a scan signal output to a gate line as a gate node, and receives data from a first node of the driving transistor and a switching transistor connected between the lines, a sensing transistor that receives a sense signal output from the sensing signal line as a gate node, and a sensing transistor connected between the second node of the driving transistor and a reference voltage line, and a storage capacitor.

In addition, the subpixels of the display panel include a gate node of a sensing transistor in each subpixel disposed on an n+1 (n is an integer greater than or equal to 0) subpixel line, and each subpixel disposed on an n+2th subpixel line. The gate node of the sensing transistor is connected to the same k+1 (k is an integer greater than or equal to 0)-th sensing signal line, thereby increasing the aperture ratio of each sub-pixel and increasing the lifespan of the organic light emitting diode.

In addition, the organic light emitting diode display driving method of the present invention includes a display panel in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged, a source driver driving the plurality of data lines, and a plurality of gate lines a scan driver for driving a scan driver, a source driver, and a controller for controlling the scan driver;

Each subpixel includes a gate node of a sensing transistor in each subpixel disposed on the n+1th subpixel line (n is an integer greater than or equal to 0) and a sensing transistor within each subpixel disposed on the n+2th subpixel line. When the same k+1 (k is an integer greater than or equal to 0)-th sensing signal line is connected to the gate node, and the display panel is a blank section of an odd-numbered image frame, the n+1-th subpixel line and the n+2th subpixel line sequentially supplying a first scan signal and a second scan signal to the By supplying the black data voltage to the sub-pixels, the aperture ratio of each sub-pixel is increased and the lifespan of the organic light emitting diode is increased.

In an organic light emitting display device and a driving method thereof according to the present invention, one sensing signal line commonly connected to an n+1th subpixel line and an n+2th subpixel line adjacent to subpixels disposed on a display panel By disposing , the aperture ratio of each sub-pixel is increased and the lifespan of the organic light emitting diode is increased.

1 is a schematic system configuration diagram of an organic light emitting diode display according to the present invention.
2 is an exemplary diagram of a sub-pixel structure of an organic light emitting diode display according to the present invention.
3 is a diagram schematically illustrating a structure of sub-pixels disposed on a display panel of an organic light emitting diode display.
4 is a diagram illustrating a structure of sub-pixels disposed on a display panel of an organic light emitting diode display according to the present invention.
5 is a diagram illustrating sensing of red (R) sub-pixels of an n+1-th sub-pixel line in an odd-numbered frame during a sensing mode operation of the organic light emitting diode display according to the present invention.
6 is a diagram illustrating a scan signal and a sense signal waveform in a display mode and a sensing mode of the organic light emitting diode display according to the present invention.
7A and 7B are diagrams illustrating sensing of a sub-pixel of an n+1-th sub-pixel line of an organic light emitting diode display according to the present invention.
8A and 8B are diagrams illustrating sensing of a sub-pixel of an n+2 th sub-pixel line of an organic light emitting diode display according to the present invention.
9A and 9B show a state in which sub-pixels of a sub-pixel line corresponding to an odd-numbered image frame are sensed and a state in which sub-pixels of a sub-pixel line corresponding to an even-numbered image frame are sensed in the organic light emitting diode display according to the present invention. It is the drawing shown.
10 is a flowchart illustrating a sensing driving method of an organic light emitting display device according to the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative and the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is construed as including an error range even if there is no separate explicit description.

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used.

In the case of a description of a temporal relationship, for example, when the temporal relationship is described as 'after', 'following', 'after', 'before', etc., 'immediately' or 'directly' Unless ' is used, cases that are not continuous may be included.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or implemented together in a related relationship. may be

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. And in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

1 is a schematic system configuration diagram of an organic light emitting diode display according to the present invention, and FIG. 2 is an exemplary diagram of a subpixel structure of an organic light emitting display device according to the present invention.

Referring to FIG. 1 , in the organic light emitting diode display 100 according to the present invention, a plurality of data lines DL and a plurality of gate lines GL are disposed, and a plurality of sub-pixels (SP) are disposed. display panel 110 , a source driver 120 driving a plurality of data lines DL, a scan driver 130 driving a plurality of gate lines GL, a source driver 120 , and a scan driver and a timing controller 140 for controlling 130 and the like.

The timing controller 140 supplies various control signals to the source driver 120 and the scan driver 130 to control the source driver 120 and the scan driver 130 .

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

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

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

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

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

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

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

The above-described timing controller 140 includes a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), an input data enable (DE: Data Enable) signal, a clock signal (CLK), etc. together with the input image data. It receives various timing signals from the outside (eg, host system).

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

For example, the timing controller 140 controls the scan driver 130 , a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable signal (GOE). : Outputs various gate control signals (GCS: Gate Control Signal) including Gate Output Enable).

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

Also, in order to control the source driver 120 , the timing controller 140 includes a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE: Source). Output Enable) and output various data control signals (DCS: Data Control Signal).

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

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

Each source driver integrated circuit (SDIC) includes a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and a gamma voltage generator. can do.

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

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

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

Each subpixel SP disposed on the display panel 110 may include a circuit element such as a transistor.

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

Referring to FIG. 2 , in the organic light emitting diode display 100 according to the present invention, each sub-pixel includes an organic light emitting diode (OLED) and a driving transistor DT for driving the organic light emitting diode (OLED). : Driving Transistor and a first transistor electrically connected between the first node N1 of the driving transistor DT and a reference voltage line RVL supplying a reference voltage Vref ( T1), a second transistor T2 electrically connected between the second node N2 of the driving transistor DT and the data line DL supplying the data voltage Vdata, and the driving transistor DT and a storage capacitor (Cst) electrically connected between the first node N1 and the second node N2, and the like.

The first transistor T1 is also referred to as a “sensing transistor”, and the second transistor T2 is also referred to as a “switching transistor”.

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

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

The first node N1 of the driving transistor DT may be electrically connected to the first electrode of the organic light emitting diode OLED, and may be a source node or a drain node. The second node N2 of the driving transistor DT may be electrically connected to a source node or a drain node of the second transistor T2 and may be a gate node. The third node N3 of the driving transistor DT may be electrically connected to a driving voltage line (DVL) that supplies the driving voltage EVDD, and may be a drain node or a source node.

Also, referring to FIG. 2 , the gate line GL for supplying the scan signal SCAN to the second transistor T2 (switching transistor) and the sense signal SENSE to the first transistor T1 (sensing transistor) are provided. A sensing signal line SL is disposed.

Accordingly, the second transistor T2 and the first transistor T1 are controlled by the scan signal SCAN and the sense signal SENS, respectively.

In addition, the first transistor T1 may be used as a voltage sensing path for the first node N1 of the driving transistor DT when the sense signal SENSE is turned on.

When the second transistor T2 is turned on by the scan signal SCAN, it transfers the data voltage Vdata supplied through the data line DL to the second node N2 of the driving transistor DT.

The storage capacitor Cst is electrically connected between the first node N1 and the second node N2 of the driving transistor DT, and a data voltage corresponding to the image signal voltage or a voltage corresponding thereto is applied for one image frame time. can keep it for a while.

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

Meanwhile, one reference voltage line RVL electrically connected to the drain node or the source node of the first transistor T1 may be disposed in one sub-pixel column, or two or more sub-pixel columns. One of each may be arranged.

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

On the other hand, in the case of the organic light emitting diode display 100 according to the present invention, as the driving time of each sub-pixel SP increases, circuit elements such as the organic light emitting diode OLED and the driving transistor DT are deteriorated ( Degradation) may proceed.

Accordingly, unique characteristic values (eg, threshold voltage, mobility, etc.) of circuit elements such as the organic light emitting diode (OLED) and the driving transistor DT may change.

A change in the characteristic value of such a circuit element causes a change in luminance of a corresponding sub-pixel.

Here, the characteristic value (hereinafter, also referred to as “sub-pixel characteristic value”) of the circuit element may include, for example, the threshold voltage and mobility of the driving transistor DT, and in some cases, the organic light emitting diode (OLED). may include a threshold voltage of

The organic light emitting display device 100 according to the present invention has a sensing mode function for sensing (measuring) a change in a characteristic value of a sub-pixel or a characteristic value deviation between each sub-pixel, and a compensation function for compensating for a characteristic value of a sub-pixel using the sensing result. can provide

Accordingly, the organic light emitting diode display 100 of the present invention includes a sub-pixel structure ( FIG. 2 ) suitable for providing a sensing and compensation function for sub-pixel characteristic values, and a compensation circuit including the sensing and compensation structure. do.

3 is a diagram schematically illustrating a structure of sub-pixels disposed on a display panel of an organic light emitting diode display.

Referring to FIG. 3 together with FIG. 1 , in the basic unit of the organic light emitting diode display of the present invention, four sub-pixels SP respectively connected to four data lines DL constitute one unit pixel. As shown in FIG. 2 , each sub-pixel SP region has a 3T1C structure.

As shown in the drawing, 2 scans including a sensing signal line SL connected to a first transistor (T1: sensing transistor) of each sub-pixel and a gate line GL connected to a second transistor (T2: switching transistor) have a structure

As shown in FIG. 2 , each of the four sub-pixels SP connected to the four data lines DL includes a driving transistor DT for driving the organic light emitting diode by receiving a driving voltage EVDD, and a reference The first transistor T1 receives the voltage Vref and transfers it to the first node N1 of the driving transistor DT, and the second node N2 of the driving transistor DT receives the data voltage Vdata The same includes a second transistor T2 transferred to , and a storage capacitor Cst connected between the first node N1 and the second node N2 of the driving transistor DT.

In addition, in each of the four sub-pixels SP, two sub-pixels SP may be positioned on both sides of the reference voltage line RVL disposed in the center.

A unit pixel composed of four subpixels SP based on one subpixel line is disposed adjacent to the subpixel line in the same direction, and one subpixel line has a gate line GL and a sensing signal line SL. this is placed

Accordingly, when the two sub-pixel lines are viewed as a reference, the gate line GL and the sensing signal line SL are disposed two each.

However, if the total width of two adjacent sub-pixel lines is L1, the non-emission region in which the gate line GL and the sensing signal line SL are disposed has a width of H1 in each sub-pixel line. Accordingly, the non-emission area of the two sub-pixel lines has a width of 2*H1.

As described above, when the sensing signal line SL is added, the non-emission area of the sub-pixel is widened and the light-emitting area is relatively narrowed, so that there is a problem in that the aperture ratio of each sub-pixel is reduced.

As such, the addition of the sensing signal line SL reduces the aperture ratio of each sub-pixel and shortens the lifespan of the organic light emitting diode.

The organic light emitting diode display and driving method of the present invention increase the aperture ratio of each subpixel by arranging the sensing signal line SL commonly disposed on the N+1th subpixel line and the N+2th subpixel line. and to prevent shortening of the lifespan of the organic light emitting diode.

4 is a diagram illustrating a structure of sub-pixels disposed on a display panel of an organic light emitting diode display according to the present invention, and FIG. 5 is an n+1 in an odd-numbered frame when the organic light emitting diode display according to the present invention operates in a sensing mode. It is a diagram illustrating sensing of red (R) sub-pixels of the th sub-pixel line, and FIG. 6 is a diagram illustrating scan signals and sense signal waveforms in a display mode and a sensing mode of the organic light emitting diode display according to the present invention. am.

4 to 6 together with FIG. 1 , in the organic light emitting diode display 100 of the present invention, a display panel 110 in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged. includes

As described with reference to FIG. 2 , each subpixel receives the scan signal SCAN output from the organic light emitting diode OLED, the driving transistor DT, and the gate line GL as a gate node, and the driving transistor DT ) of the switching transistor T2 connected between the first node and the data line DL, the sense signal SENSE output to the sensing signal line SL is applied to the gate node, and the second node of the driving transistor DT is It includes a sensing transistor T1 and a storage capacitor Cst connected between the second node and the reference voltage line RVL.

4 and 5 , the subpixel structure disposed in the organic light emitting diode display 100 of the present invention includes each subpixel disposed on an n+1 (n is an integer greater than or equal to 0)-th subpixel line; Each subpixel disposed on the n+2th subpixel line is commonly connected to one k+1th (k is an integer equal to or greater than 0)th sensing signal line SL.

Accordingly, the k+2th sensing signal line SL is also disposed in each subpixel disposed on the n+3th subpixel line and each subpixel disposed on the n+4th subpixel line.

More specifically, the connection structure of the red (R) subpixel of the n+1th subpixel line and the red (R) subpixel of the n+2th subpixel line is as follows.

The gate node of the sensing transistor T1 disposed in the red (R) subpixel of the n+1th subpixel line and the gate of the sensing transistor T1 disposed in the red (R) subpixel of the n+2th subpixel line The node is commonly connected to the k+1 (k is an integer greater than or equal to 0)-th sensing signal line SL.

In addition, the gate node of the sensing transistor T1 of the red (R) subpixel disposed on the n+3th subpixel line and the sensing transistor T1 of the red (R) subpixel disposed on the n+4th subpixel line The gate node of is connected in common to the k+2th sensing signal line SL.

The sub-pixel connection structure of the present invention has the white (W), blue (B), and green (G) sub-pixels disposed on the n+1-th sub-pixel line and the white (W), blue (B), and green (G) sub-pixels disposed on the n+2th sub-pixel line. The same is true between the W), blue (B) and green (G) subpixels.

In addition, white (W), blue (B) and green (G) subpixels disposed on the n+3rd subpixel line and white (W), blue (B) and green (G) subpixels disposed on the n+4th subpixel line The same is true between the green (G) subpixels.

In FIG. 4 , since two gate lines GL and one sensing signal line SL are disposed on the two subpixel lines, compared to FIG. 3 , two gate lines GL based on the two subpixel lines. and one sensing signal line SL can be reduced.

Accordingly, since the area of the non-emission region corresponding to the two gate lines GL and one sensing signal line SL can be reduced, the aperture ratio of the subpixels disposed in each subpixel line can be increased. .

Accordingly, the width of the two sub-pixel lines is L2, which is similar to L1 of FIG. 3, but since the non-emission area existing in the two sub-pixel lines is reduced, the width of the sub-pixels arranged in each sub-pixel line is from R1 to R1. increased to R2.

As such, when the aperture ratio of each sub-pixel is increased, the lifespan of the organic light emitting diode is increased and device performance is improved.

As shown in FIG. 4 , although the connection structure of the subpixels disposed in the organic light emitting display device of the present invention is changed, the sensing mode operation of the subpixels disposed in each subpixel line may proceed normally.

Referring specifically to the sensing driving of the organic light emitting display device of the present invention with reference to FIG. 5 , the sub-pixels disposed on the display panel 110 are n+1 (n is an integer greater than or equal to 0)-th sub-pixel line in the row direction. each subpixel disposed on , each subpixel disposed on the n+2th subpixel line, each subpixel disposed on the n+3th subpixel line, each subpixel disposed on the n+4th subpixel line, etc. can be distinguished

If the n+1th subpixel line and the n+2th subpixel line are viewed as a pair of subpixel lines, the n+1th subpixel line, the n+3th subpixel line, ... , subpixel lines are sensed in sensing mode after displaying odd-numbered image frames (a blank section after the 1st, 3rd, … 2n-1th image frames), n+2th, n+4th, … , sub-pixel lines sense each sub-pixel in the sensing mode after the even-numbered image frame (a blank section after the second, fourth, ... 2n-th image frame) is displayed.

Referring to FIG. 6 , the organic light emitting diode display 100 may be divided into a display mode for displaying an image frame and a sensing mode for performing a sensing operation in a blank section between image frames.

The blank section refers to a section between displayed image frames based on the vertical synchronization signal Vsync.

However, since the sensing mode operation is not fixed, the sensing driving described below may be applied to the off-sensing section OFFS or the on-sensing section ONS for sensing mobility.

The first scan signal Scan1, the second scan signal Scan2, and the first sensing between the first image frame and the second image frame of FIG. 6 and between the first image frame and the blank period after the first image frame A signal Sense1 is sequentially supplied to the n+1th subpixel line and the n+2th subpixel line.

In the blank section of the first image frame (1st Frame), each sub-pixel disposed on the n+1-th sub-pixel line is sensed. In FIG. 5, the red (R) sub-pixel is sensed among the n+1-th sub-pixel line. shown to do.

Similarly, each sub-pixel of the n+3 th sub-pixel line is sensed in a blank section of a third image frame (3rd Frame).

Although not shown in the drawing, each subpixel disposed on the n+2th subpixel line is sensed in the blank section of the second image frame (2nd Frame), and in the blank section of the fourth image frame (4th Frame), the n+4th subpixel is sensed Each subpixel disposed on a subpixel line is sensed.

As described above, in the present invention, as shown in FIG. 4 , by changing the sub-pixel structure, n+1, n+3, ... Each subpixel of the 2n-1th subpixel line is sensed, and n+2, n+4, ... By sensing each sub-pixel of the 2n-th sub-pixel line, the sensing mode operation can be normally performed despite the change in the sub-pixel structure.

A detailed sensing operation of the sub-pixels disposed on each sub-pixel line corresponding to the odd-numbered image frame and the even-numbered image frame will be described with reference to FIGS. 7A to 8B below.

7A and 7B are diagrams illustrating sensing of a sub-pixel of an n+1-th sub-pixel line of an organic light emitting diode display according to the present invention, and FIGS. 8A and 8B are diagrams of an organic light emitting display according to the present invention. It is a diagram illustrating a state in which a sub-pixel of an n+2 th sub-pixel line is sensed.

Referring to FIGS. 7A and 7B , assuming that a pair of sub-pixel lines are an n+1-th sub-pixel line and an n+2-th sub-pixel line, an odd-numbered image frame Here, after the first image frame is displayed, n in a blank section Each subpixel of the +1th subpixel line is sensed.

7B illustrates a first scan signal Scan1 , a second scan signal Scan2 , and a first sense signal Sense1 supplied to an n+1 th subpixel line and an n+2 th subpixel line in a blank section. .

First, the description has been focused on sensing the red (R) sub-pixel in each sub-pixel line, but the same is applied to sensing other sub-pixels.

As shown in FIG. 7B , when the first scan signal Scan1 is supplied to the n+1th subpixel line, the switching transistor T2 disposed in each subpixel of the n+1th subpixel line is turned on, and the red (R) The data voltage Vdata_sen for sensing is supplied through the data line DL corresponding to the sub-pixel.

The red (R) sub-pixel of the n+1-th sub-pixel line is sensed by the sensing data voltage Vdata_sen (section A). In this case, the black data voltage is supplied to the white (W), blue (B), and green (G) sub-pixels of the n+1-th sub-pixel line.

Then, the switching transistor T2 disposed in each subpixel of the n+2 th subpixel line is turned on by the second scan signal Scan2 signal. At this time, the red (R) subpixel of the n+1th subpixel line and the red (R) subpixel of the n+2th subpixel line are connected to the same data line, so that the second scan signal Scan2 is supplied. At this time, the black data voltage Vdata_B is supplied to the data line DL corresponding to the red (R) subpixel of the n+2th subpixel line (section B).

That is, when the first scan signal Scan1 is supplied to the data line DL corresponding to the red (R) sub-pixel, the sensing data voltage Vdata_sen is supplied, and when the second scan signal Scan2 is supplied, A black data voltage Vdata_B is supplied.

8A and 8B , in the even-numbered image frame, after the second image frame is displayed, each sub-pixel of the n+2 th sub-pixel line is sensed in the blank section.

As shown in FIG. 8B , in the blank section after the second image frame, the first scan signal Scan1, the second scan signal Scan2, and the first A sense signal Sense1 is supplied.

As shown in FIG. 8B , when the first scan signal Scan1 is supplied to the n+1th subpixel line, the switching transistor T2 disposed in each subpixel of the n+1th subpixel line is turned on, and the red (R) The black data voltage Vdata_B is first supplied through the data line DL corresponding to the sub-pixel.

Accordingly, unlike FIG. 7A , in FIG. 8A , the red (R) subpixel of the n+1th subpixel line is in a black state (inactive) in the section C to which the first scan signal Scan1 is supplied.

Then, when the switching transistor T2 disposed in each subpixel of the n+2th subpixel line is turned on by the second scan signal Scan2, the red (R) subpixel of the n+2th subpixel line and A sensing data voltage Vdata_sen is supplied to the corresponding data line DL.

That is, in order to sense the red (R) subpixel of the n+2th subpixel line, when the first scan signal Scan1 is supplied, the black data voltage Vdata_B is supplied through the data line DL to n+1 The red (R) sub-pixel of the th sub-pixel line is made inactive, and when the second scan signal Scan2 is supplied, the sensing data voltage Vdata_sen is supplied through the data line DL to the n+2 th sub-pixel. Senses the red (R) subpixel of the pixel line.

As described above, in the organic light emitting diode display of the present invention, each subpixel of the n+1th subpixel line and each subpixel of the n+2th subpixel line are commonly connected to the sensing signal line to increase the aperture ratio of the subpixel. , in the sensing mode operation for each sub-pixel, sensing driving may proceed normally.

9A and 9B show a state in which sub-pixels of a sub-pixel line corresponding to an odd-numbered image frame are sensed and a state in which sub-pixels of a sub-pixel line corresponding to an even-numbered image frame are sensed in the organic light emitting diode display according to the present invention. It is the drawing shown.

9A and 9B, according to the method described with reference to FIGS. 7A to 8B, in the odd-numbered image frame, the n+1th, n+3th, ... , it can be seen that each subpixel of the 2n-1 th subpixel line is sensed.

In addition, in the even-numbered image frame, the n+2th, n+4th, ... , it can be seen that each sub-pixel of the 2n-th sub-pixel line is sensed.

In the drawing, 2160 image frames are shown in the first image frame, and each image frame is composed of a pair of sub-pixel lines. For example, in the 1st image frame, the red (R) subpixel of the n+1th subpixel line is sensed ( FIG. 9A ), and in the 2nd image frame, the red (R) subpixel of the n+2th subpixel line is sensed It can be seen that (Fig. 9b).

As described above, although the pair of subpixel lines are connected to the common sensing signal line in the present invention, the sensing operation of the subpixels disposed in each subpixel line can be performed normally.

10 is a flowchart illustrating a sensing driving method of an organic light emitting display device according to the present invention.

Referring to FIG. 10 , the organic light emitting display device of the present invention may operate in a display mode for displaying an image frame and a sensing mode for sensing a change in a characteristic value of each sub-pixel.

The method for driving an organic light emitting display device of the present invention includes the steps of performing a sensing mode operation between display sections in which the organic light emitting display device displays an image frame (S1001), and determining whether the image frame in which the sensing mode operation is performed is an odd number In the determining step (S1002), and in the case of an odd-numbered image frame, the first scan signal and the second scan signal are sequentially applied to the N+1th subpixel line and the N+2th subpixel line according to the principle described with reference to FIGS. 7A and 7B. The step of supplying a scan signal (S1003), the step of sensing the subpixel of the N+1-th sub-pixel line according to the first scan signal (S1004), and the operation of the N+2-th sub-pixel line according to the second scan signal and supplying a black data voltage to the sub-pixel (S1005).

Here, the odd-numbered image frame and the even-numbered image frame mean a blank period after the odd-numbered image frame is displayed, the blank period and the even-numbered image frame are displayed.

In addition, when the image frame in which the sensing mode operation is performed is an even-numbered image frame, as described with reference to FIGS. 8A and 8B , the first scan signal is sequentially applied to the N+1th subpixel line and the N+2th subpixel line. and supplying a second scan signal (S1006), supplying a black data voltage to the subpixels of the N+1th subpixel line according to the first scan signal (S1007), and N according to the second scan signal and sensing the subpixel of the +2nd subpixel line (S1008).

In an organic light emitting display device and a driving method thereof according to the present invention, one sensing signal line commonly connected to an n+1th subpixel line and an n+2th subpixel line adjacent to subpixels disposed on a display panel By disposing the , the aperture ratio of each sub-pixel is increased and the lifespan of the organic light emitting diode is increased.

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

100: organic light emitting display device
110: display panel
120: source driver
130: scan driver
140: timing controller

Claims (8)

a display panel in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged;
a source driver for driving the plurality of data lines;
a scan driver driving the plurality of gate lines; and
A controller for controlling the source driver and the scan driver,
Each subpixel is
organic light emitting diodes;
a driving transistor for driving the organic light emitting diode;
a switching transistor that receives a scan signal output from a gate line as a gate node and is connected between a first node of the driving transistor and a data line;
a sensing transistor that receives a sense signal output from the sensing signal line as a gate node and is connected between a second node of the driving transistor and a reference voltage line; and
a storage capacitor;
a gate node of a sensing transistor in each subpixel disposed on an n+1 (n is an integer greater than or equal to 0)-th subpixel line;
An organic light emitting diode display device wherein the gate node of the sensing transistor in each subpixel disposed on the n+2th subpixel line is connected to the same k+1th sensing signal line (k is an integer greater than or equal to 0). According to claim 1,
a gate node of the sensing transistor in each subpixel disposed on the n+3th subpixel line;
An organic light emitting diode display device wherein the gate node of the sensing transistor in each subpixel disposed on the n+4th subpixel line is connected to the same k+2th sensing signal line. 3. The method of claim 2,
The organic light emitting diode display is configured to sense each subpixel disposed on the n+1th subpixel line and the n+3th subpixel line in a blank section of an odd-numbered image frame. 3. The method of claim 2,
The organic light emitting diode display is configured to sense each subpixel disposed on the n+2th subpixel line and the n+4th subpixel line in a blank section of an even-numbered image frame. According to claim 1,
A first scan signal is supplied to the n+1 (n is an integer greater than or equal to 0) subpixel line, a second scan signal is supplied to the n+2th subpixel line, and is disposed on the n+1th subpixel line Each sub-pixel line of the n+1-th sub-pixel line by a first sense signal supplied to a sensing signal line commonly connected to the gate node of the sensing transistor and the gate node of the sensing transistor disposed in the n+2 sub-pixel line An organic light emitting display device that senses pixels. According to claim 1,
A first scan signal is supplied to the n+1 (n is an integer greater than or equal to 0) subpixel line, a second scan signal is supplied to the n+2th subpixel line, and is disposed on the n+1th subpixel line Each sub-pixel line of the n+2th subpixel line by the first sense signal supplied to the sensing signal line commonly connected to the gate node of the sensing transistor and the gate node of the sensing transistor disposed on the n+2th subpixel line An organic light emitting display device that senses pixels. a display panel in which a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged;
a source driver for driving the plurality of data lines;
a scan driver driving the plurality of gate lines; and
A controller for controlling the source driver and the scan driver,
Each subpixel is
The gate node of the sensing transistor in each subpixel disposed in the n+1 (n is an integer greater than or equal to 0) subpixel line and the gate node of the sensing transistor in each subpixel disposed in the n+2th subpixel line are the same k It is connected to the +1 (k is an integer greater than or equal to 0)-th sensing signal line,
when the display panel is a blank section of an odd-numbered image frame, sequentially supplying a first scan signal and a second scan signal to an n+1th subpixel line and an n+2th subpixel line;
sensing a sub-pixel of an n+1-th sub-pixel line according to the first scan signal; and
and supplying a black data voltage to a sub-pixel of an n+2 th sub-pixel line in accordance with the second scan signal. 8. The method of claim 7,
sequentially supplying a first scan signal and a second scan signal to an n+1 th sub-pixel line and an n+2 th sub-pixel line when the display panel is a blank section of an even-numbered image frame;
supplying a black data voltage to a subpixel of an n+1th subpixel line in accordance with the first scan signal; and
and sensing a sub-pixel of an n+2 th sub-pixel line according to the second scan signal.

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