KR20140119419A - Organic light emitting diode display device and method for driving the same - Google Patents

Abstract

The present invention relates to an organic light-emitting diode display device and a method for driving the same, wherein the organic light-emitting diode display device detects the deterioration degree of organic light-emitting diodes and the temperature equilibrium of an organic light-emitting diode display panel itself, and thus improves the performance and efficiency of deterioration compensation, thereby increasing the quality of displayed images. The organic light-emitting diode display device comprises: a display panel having a monitoring pixel area and an image display pixel area; a gate driving unit for driving gate lines of the display panel; a data driving unit which drives data lines of the display panel, and performs deterioration compensation by maintaining or updating a deterioration compensation value depending on the deterioration degree and temperature equilibrium of organic light-emitting diodes formed in at least one pixel area among the monitoring pixel area and the image display pixel area; and a timing control unit for controlling the gate driving unit and the data driving unit in order to display images in the image display pixel area of the display panel.

Description

Technical Field [0001] The present invention relates to an organic light emitting diode (OLED) display device,

The present invention relates to an organic light emitting diode (OLED) display, and more particularly, to an organic light emitting diode (OLED) display device capable of detecting degradation degree of organic light emitting diodes and temperature balance of the organic light emitting diode display panel itself to improve deterioration compensation performance and efficiency, Emitting diode display device and a driving method thereof.

2. Description of the Related Art In recent years, organic light emitting diodes (OLED) display devices for displaying images by controlling the amount of emitted light of an organic light emitting layer have been spotlighted in flat panel display devices, which are widely used.

In an OLED display device, a plurality of pixels are arranged in a matrix form to display an image. Here, each pixel includes an OLED and a pixel driver for independently driving the OLED, and the pixel driver adjusts the brightness of each pixel by adjusting the amount of current flowing in the OLED.

However, since the OLED is a self-luminous device, the deterioration is accelerated as the driving time increases, and the emission capability is reduced. Accordingly, the OLED display device has a problem that the degradation rate of the OLED differs from one pixel to another, and the luminance varies even when the same data voltage is applied. In order to compensate for this problem, a technique of determining the degree of deterioration of the OLED by sensing the impedance of the OLED and compensating the degradation has been introduced.

However, since the impedance value of the OLED changes sensitively to the ambient temperature, the value sensed by the impedance of the OLED is also inaccurate, and it is difficult to compensate the deterioration of the OLED. In addition, the temperature unbalance state may be generated and maintained for each display region of the OLED display panel depending on the display characteristics of the image, so that the deterioration compensation efficiency in the temperature unbalanced state can not but be reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an organic light emitting diode display panel which detects the degree of deterioration of organic light emitting diodes formed in a monitoring pixel region and an image display region, An organic light emitting diode (OLED) display device, and a driving method thereof.

According to another aspect of the present invention, there is provided an organic light emitting diode (OLED) display device including: a display panel having a monitoring pixel region and an image display pixel region; A gate driver for driving gate lines of the display panel; And driving the data lines of the display panel and maintaining or updating a deterioration compensation value according to deterioration degree and temperature balance of the organic light emitting diodes formed in at least one pixel region of the monitoring pixel region and the image display pixel region, A data driver for driving the data driver; And a timing controller for controlling the gate and the data driver so that an image is displayed in the image display pixel region of the display panel.

Wherein the data driver receives deterioration detection values of each of the video display pixels and the monitoring pixels through a plurality of sensing lines to detect a degree of deterioration of the monitoring pixels and the video display pixels, The deterioration detection value detection timing of the video display pixels and the monitoring pixels is delayed after a predetermined period of time without generating or updating the deterioration compensation value if the temperature of the monitoring pixels is determined to be in an unbalanced state, When the temperature of the monitoring pixels is determined to be in an equilibrium state, the degradation compensation is performed by generating or updating the deterioration compensation value according to the deterioration degree of the monitoring pixels or the image display pixels.

Wherein the data driver compares the current deterioration detection values sequentially detected in at least one direction in which the monitoring pixels are arranged with a deterioration detection value of a previously detected and stored previous deterioration detection value and different pixels, , And in accordance with the condition of the following equation (1)

[Equation 1]

Temperature equilibrium condition: mV (noise)? MAX (Vnow-Vint) - MIN (Vout-Vint)

(Vout-Vint) between the previous deterioration detection value "Vint" and the current deterioration detection value "Vout" of the deteriorated pixel and the current deterioration detection value "Vint" And the temperature equilibrium state is determined only when the difference value "MAX (Vnow-Vin)" of the value "Vnow" is smaller than or equal to the previously set noise level "mV".

Wherein the data driver determines whether the temperatures of the image display pixels are balanced by analyzing deterioration detection values of the image display pixels when the temperature of the monitoring pixels is determined to be in an equilibrium state, The deterioration detection value detection timing of the video display pixels and the monitoring pixels is delayed after a predetermined period of time without generating or updating the deterioration compensation value. If the temperature of the video display pixels is determined to be in an equilibrium state, And the deterioration compensation is performed by updating the deterioration compensation value according to the deterioration degree of the image display pixels.

Wherein the data driver compares the current deterioration detection values sequentially detected in at least one direction in which the image display pixels are arranged with a previously detected deterioration detection value and deterioration detection values of different pixels, And determines the temperature equilibrium state only when the current deterioration detection value deteriorated in the image display pixels is included in the upper and lower temperature equilibrium condition ranges according to the condition of Equation (2) below,

&Quot; (2) "

LSL? Vout? USL,

LSL = degree of deterioration - Temperature offset - Noise (V),

USL = temperature offset + noise (V) + degree of deterioration.

Here, "Vout" is the deterioration detection value of the deteriorated region, "LSL" is the lower temperature equilibrium condition according to the temperature rise, and "USL &

According to another aspect of the present invention, there is provided a method of driving an organic light emitting diode (OLED) display device including driving gate lines of a display panel having a monitoring pixel region and an image display pixel region; Performing degradation compensation by maintaining or updating a deterioration compensation value according to deterioration degree and temperature equilibrium of organic light emitting diodes formed in at least one pixel region of the monitoring pixel region and the image display pixel region; And driving the data lines of the display panel.

The deterioration compensating step may include receiving degradation detection values of each of the video display pixels and the monitoring pixels through a plurality of sensing lines provided in the display panel and detecting the degree of deterioration of the monitoring pixels and the video display pixels Determining whether the temperature of the monitoring pixels is equalized or not, detecting degradation detection values of the video display pixels and the monitoring pixels without generating or updating the degradation compensation value if the temperature of the monitoring pixels is determined to be in an unbalanced state, Delaying the timing after a predetermined period of time, and performing a deterioration compensation by generating or updating the deterioration compensation value according to the deterioration degree of the monitoring pixels or the image display pixels when the temperature of the monitoring pixels is determined to be in an equilibrium state The method comprising the steps of:

Wherein the step of determining the temperature equilibrium state of the monitoring pixels comprises comparing the current deterioration detection values sequentially detected in at least one direction in which the monitoring pixels are arranged with the previously detected and stored previous deterioration detection value and deterioration detection And determines whether or not temperature equilibrium exists. According to the condition of the following equation (1)

[Equation 1]

Temperature equilibrium condition: mV (noise)? MAX (Vnow-Vint) - MIN (Vout-Vint)

(Vout-Vint) between the previous deterioration detection value "Vint" and the current deterioration detection value "Vout" of the deteriorated pixel and the current deterioration detection value "Vint" And the temperature equilibrium state is determined only when the difference value "MAX (Vnow-Vin)" of the value "Vnow" is smaller than or equal to the previously set noise level "mV".

The deterioration compensation may include: determining whether the temperature of the image display pixels is balanced by analyzing deterioration detection values of the image display pixels when the temperature of the monitoring pixels is determined to be in an equilibrium state; The method comprising: delaying a deterioration detection value detection timing of the video display pixels and monitoring pixels after a predetermined period of time without generating or updating the deterioration compensation value if it is determined that the video display pixels are in an equilibrium state; And updating the deterioration compensation value according to the deterioration degree of the monitoring pixels or the image display pixels to perform the deterioration compensation.

Wherein the step of determining whether or not the temperature of the image display pixels is equal to or less than the predetermined temperature is performed by comparing the current deterioration detection values sequentially detected in at least one direction in which the image display pixels are arranged, And determining whether temperature equilibrium exists or not by comparing the detected deterioration value with the detected value to determine whether the temperature deterioration detected in the image display pixels is within the upper and lower temperature equilibrium condition ranges according to the condition of Equation It is judged as an equilibrium state,

&Quot; (2) "

LSL? Vout? USL,

LSL = degree of deterioration - Temperature offset - Noise (V),

USL = temperature offset + noise (V) + degree of deterioration.

Here, "Vout" is the deterioration detection value of the deteriorated region, "LSL" is the lower temperature equilibrium condition according to the temperature rise, and "USL &

The organic light emitting diode display device and the driving method thereof according to the present invention detect degradation degree of organic light emitting diodes formed in at least one pixel region of a monitoring pixel region and an image display region and perform degradation compensation for reducing a threshold voltage error of organic light emitting diodes The display quality of the image can be enhanced.

In addition, deterioration compensation performance and efficiency can be further improved by detecting the temperature equilibrium of at least one pixel region of the monitoring pixel region and the image display region and performing deterioration compensation by updating or maintaining the deterioration compensation value according to the detection result .

1 is a configuration diagram of an OLED display device according to an embodiment of the present invention;
Fig. 2 is an equivalent circuit diagram of a monitoring pixel and a display pixel shown in Fig. 1. Fig.
3 is a flowchart illustrating a method of driving a deterioration compensation of the data driver shown in FIG.
4 is a view for explaining the step of detecting temperature equilibrium in the monitoring pixel region of FIG. 3;
FIG. 5 is a graph showing a comparison of OLED threshold voltages of previously-detected monitoring pixels with currently detected OLED threshold voltages according to driving time.
FIG. 6 is a flowchart for explaining a method of driving a deterioration compensation of the data driver shown in FIG. 1;
7 is a view for explaining the step of detecting temperature equilibrium in the video display pixel region of FIG. 6;
FIG. 8 is a graph comparing the OLED threshold voltage of previously detected image display pixels with the currently detected OLED threshold voltage according to driving time.

Hereinafter, an organic light emitting diode (OLED) display device and a driving method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an OLED display device according to an embodiment of the present invention. 2 is an equivalent circuit diagram of a monitoring pixel and a display pixel shown in FIG.

The OLED display shown in FIG. 1 includes a display panel 2 on which a monitoring pixel region and an image display pixel region are formed; A gate driver 6 for driving the gate lines GL1 to GLn of the display panel 2; It is preferable to drive the data lines DL1 to DLm of the display panel 2 and maintain or compensate the degradation compensation value according to the degree of deterioration of the OLEDs formed in at least one pixel region of the monitoring pixel region and the image display pixel region, A data driver 4 for updating and performing deterioration compensation; And a timing controller (8) for controlling the gate and data drivers (4, 6) so that an image is displayed in the video display pixel area of the display panel (2).

A plurality of image display pixels DP which emit red light, green light or blue light and display an image are sequentially arranged in a matrix form in the image display pixel area of the display panel 2. [ In the monitoring pixel region, a plurality of monitoring pixels (MP) are arranged along at least one side non-display region of the image display pixel region. Here, the monitoring pixel MP is substantially the same in circuit configuration as the image display pixel DP, but may be set to display only the black gradation, unlike the display pixel DP. That is, the monitoring pixel MP does not display an image, and is a configuration for sensing deterioration of the OLED according to an external temperature.

Each of the video display pixel DP and the monitoring pixel MP includes a pixel driver for driving the OLED and the OLED, as shown in FIG.

The pixel driver is connected to a gate line GL to which a plurality of gate signals are supplied, a data line DL to which a data voltage is supplied, and a sensing line SL for sensing the degree of deterioration of the OLED.

The pixel driver includes a plurality of thin film transistors and at least one capacitor. The plurality of thin film transistors adjust the amount of current flowing in the OLED according to the data voltage supplied from the data line DL to adjust the brightness of each pixel.

The embodiment of the present invention detects the degree of degradation and temperature balance of the OLED provided in the monitoring pixels MP through the sensing lines SL and maintains the compensation value of the video display pixels DP according to the detection result Or perform the deterioration compensation. In addition, in the embodiment of the present invention, in addition to the OLED included in the monitoring pixels MP, the degree of deterioration and temperature balance of the OLED included in the image display pixels DP are also detected, It is possible to perform deterioration compensation by maintaining or updating the movie compensation value of the pixels DP.

The deterioration detection value detected in the monitoring pixels MP or the display pixels DP is compared with the previous deterioration detection value or the deterioration detection value of other pixels stored in the monitoring pixels MP or the display pixels DP, The compensation value is generated or updated to perform degradation compensation.

The structure of an OLED display according to the present invention will now be described with reference to FIG.

The gate driver 6 is responsive to a gate control signal GCS from the timing controller 8, for example, a gate start pulse (GSP) and a gate shift clock (GSC) And supplies it to the gate lines GL1 to GLn.

The data driver 4 is connected to the timing controller 8 using a source start pulse SSP and a source shift clock SSC among data control signals DCS from the timing controller 8. [ To the data voltage Vdata. The data driver 4 supplies the data voltage Vdata to the data lines DL1 to DLm in response to a source output enable (SOE) signal.

The data driver 4 receives the deterioration detection values of the OLED included in each of the video display pixels DP and the monitoring pixels MP through the sensing lines SL1 to SLm, And the degree of deterioration and temperature equilibrium of the image display pixels DP are detected and determined. The degradation compensation is performed to reduce the threshold voltage error of the OLEDs by updating or maintaining the deterioration compensation value according to the deterioration degree and the temperature balance of the monitoring pixels MP and the display pixels DP. The deterioration detection value of the OLED included in each of the video display pixels DP and the monitoring pixels MP is an impedance value of the OELD included in each of the video display pixels DP and the monitoring pixels MP, Can be the threshold voltage of each OLED. The data driver 4 determines the temperature equilibrium using the deterioration detection values of the OLEDs included in the monitoring pixels MP and the image display pixels DP, The compensation value is updated. In the temperature non-equilibrium state, deterioration compensation is performed by maintaining the deterioration compensation value. In the case where the deterioration compensation value is not set at the initial driving point or the deteriorated state, deterioration compensation is not performed. In the present invention, the data driver 4 receives the deterioration detection values of the OLED included in the video display pixels DP and the monitoring pixels MP and updates or maintains the deterioration compensation value according to temperature equilibrium, Only the technical features to be performed are described as an example. However, when providing the deterioration detection values detected by the data driving unit 4 to the timing control unit 8, the timing control unit 8 compares and analyzes the deterioration detection values to update or maintain the deterioration compensation value according to temperature equilibrium Degradation compensation may be performed. Hereinafter, the technical features of performing the deterioration compensation in the data driver 4 will be described in more detail with reference to the accompanying drawings.

The timing controller 8 arranges image data RGB input from the outside in accordance with the size and resolution of the display panel 2 and supplies the image data to the data driver 4. [ The timing controller 8 controls the timing controller 8 using external synchronous signals such as a dot clock DCLK, a data enable signal DE, a horizontal synchronizing signal Hsync, a vertical synchronizing signal Vsync, And data control signals GCS and DCS to the gate driver 6 and the data driver 4, respectively. If the timing controller 8 is set to perform the deterioration compensation, the deterioration detection values of the video display pixels DP and the monitoring pixels MP are received through the data driver 4, The degradation compensation value may be updated or maintained according to the temperature equilibrium.

3 is a flowchart illustrating a method of driving a deterioration compensation of the data driver shown in FIG.

3, the data driver 4 receives deterioration detection values of the video display pixels DP and the monitoring pixels MP through the sensing lines SL1 to SLm, And the degree of deterioration of the image display pixels DP are detected (step S1). Here, the degree of deterioration is determined by comparing the deterioration detection value of the currently detected monitoring pixels MP or the display pixels DP with the previously deteriorated detection values previously stored and stored, and determining the degree of deterioration according to the comparison result .

In addition, the data driver 4 analyzes deterioration detection values of the monitoring pixels MP to determine whether the temperature of the monitoring pixels MP is balanced (step S2). Specifically, the temperature equilibrium state of the monitoring pixels MP is determined by comparing deterioration detection values of the currently-detected monitoring pixels MP with previously deteriorated detection values that have been detected and stored previously and deterioration detection values of other pixels, .

If the temperature of the monitoring pixels MP is determined to be non-equilibrium as a result of the temperature equilibrium of the monitoring pixels MP, the image display pixels DP and the monitoring pixels MP are generated without updating or updating the deterioration compensation values, The detection timing of the deterioration detection value is delayed after a predetermined period (step S3).

When the degradation compensation is started in the temperature non-equilibrium state or the deterioration compensation is performed by updating the deterioration compensation value, the display quality may be lowered or the deterioration compensation efficiency may be lowered. Thus, when the temperature of the monitoring pixels MP is determined to be in a non-equilibrium state, the deterioration detection value detection timing of the video display pixels DP and the monitoring pixels MP is delayed by a predetermined period or until the next ON / Thereby preventing compensation from being performed.

On the other hand, when the temperature of the monitoring pixels MP is determined to be in an equilibrium state, the deterioration compensation for decreasing the threshold voltage error of the OLEDs by updating the deterioration compensation value according to the deterioration degree of the monitoring pixels MP or the image display pixels DP (S4). That is, in the temperature equilibrium state, the deterioration detection value of the currently detected monitoring pixels MP or the display pixels DP is compared with the previously detected deterioration detection values previously stored, and the deterioration compensation Value is generated or updated. When the deterioration compensation value is generated or updated, the voltage level corresponding to the deterioration compensation value is added or added to the OLED driving voltage (for example, VDD), the gamma reference voltage, or the analog gamma voltage level, do.

FIG. 4 is a view for explaining the step of detecting temperature equilibrium in the monitoring pixel region of FIG. 3. FIG. 5 is a graph comparing the OLED threshold voltage of the monitoring pixels previously detected with the currently detected OLED threshold voltage according to driving time.

4 and 5, the data driver 4 controls the data driver 4 in at least one direction in which the monitoring pixels MP are arranged, for example, a vertically arranged direction (arrow direction (a) the current deterioration detection values Vnow sequentially detected in the direction of the arrow ((b)) are compared with the deterioration detection values of the previously detected and stored previous deterioration detection value Vint and the different pixels, do. In this case, the current deterioration detection value Vnow of the monitoring pixels MP in which no deterioration has occurred is maintained at the same or similar width as the previous deterioration detection value Vint (MAX (Vnow-Vin) The current deterioration detection value Vout of the generated monitoring pixels MP is greatly different from the previous deterioration detection value Vint (MIN (Vout-Vint)).

Accordingly, the data driver 4 transfers the difference (MIN (Vout-Vint)) between the previous deterioration detection value (Vint) and the current deterioration detection value (Vout) of the deteriorated pixel according to the condition of the following equation Only when the difference MAX (Vnow-Vin) between the deterioration detection value Vint of the non-deteriorated pixel and the current deterioration detection value Vnow of the non-deteriorated pixel is less than or equal to a predetermined noise level mV, .

[Equation 1]

Temperature equilibrium condition: mV (noise)? MAX (Vnow-Vint) - MIN (Vout-Vint)

In other words, according to the condition of Equation (1), the previous deterioration detection value Vint is compared with the difference value MIN (Vout-Vint) between the previous deterioration detection value Vint and the current deterioration detection value Vout of the deteriorated pixel And the difference (MAX (Vnow-Vin) between the current deterioration detection value Vnow of the non-deteriorated pixel and the current deterioration detection value Vnow of the non-deteriorated pixel is greater than a predetermined noise level (mV).

For example, after the noise level is preset to 24 mV, if the difference value MAX (Vnow-Vin) between the previous deterioration detection value Vint and the current deterioration detection value Vnow of the non-deteriorated pixel is equal , And "(MAX (Vnow-Vin) = 0"). If the previous deterioration detection value Vint is 0V and the current deterioration detection value Vout of the deteriorated pixel is -600mV, (Vout-Vint) - MIN (Vout-Vint) = 0 - (-600mV) = 600mV, which is a preset noise level Which is higher than 24 mV.

6 is a flowchart for explaining a method of driving the deterioration compensation of the data driver shown in FIG.

6, the data driver 4 receives deterioration detection values of each of the video display pixels DP and the monitoring pixels MP through the sensing lines SL1 to SLm, The degree of deterioration of the video display pixels DP is detected (ST1 step). As described above, the degree of deterioration is determined by comparing the deterioration detection value of the currently detected monitoring pixels MP and the display pixels DP with the previously deteriorated detection values previously stored and stored, .

In addition, the data driver 4 analyzes deterioration detection values of the monitoring pixels MP to determine whether the temperature of the monitoring pixels MP is balanced (ST2). At this time, the temperature equilibrium of the monitoring pixels MP is determined according to the method of FIGS. 4 and 5 and the condition of Equation (1). Therefore, the method of determining whether the temperature of the monitoring pixels MP is equalized will be described in detail with reference to FIG. 4 and FIG.

If the temperature of the monitoring pixels MP is determined to be non-equilibrium as a result of the temperature equilibrium of the monitoring pixels MP, the image display pixels DP and the monitoring pixels MP are generated without updating or updating the deterioration compensation values, (Step ST3). In this case, as shown in FIG. When the temperature of the monitoring pixels MP is determined to be in the non-equilibrium state, the deterioration detection value detection timing of the video display pixels DP and the monitoring pixels MP is delayed by a predetermined period or the next ON / OFF Thereby preventing deterioration compensation from being performed.

On the other hand, if the temperature of the monitoring pixels MP is determined to be in an equilibrium state, the data driver 4 analyzes deterioration detection values of the monitoring pixels MP to determine whether the temperature of the image display pixels DP is balanced (ST4 step). Specifically, the temperature equilibrium of the image display pixels DP is determined by comparing the deterioration detection values of the currently detected image display pixels DP with the previously detected deterioration detection value and the deterioration detection values of the other image display pixels DP Thereby determining whether the temperature is balanced. At this time, when the temperature of the video display pixels DP is determined to be in the non-equilibrium state, the deterioration detection value detection timing of the video display pixels DP and the monitoring pixels MP is set in advance (ST3).

Alternatively, when the temperatures of the image display pixels DP are determined to be in an equilibrium state, the degradation compensation value is updated according to the degree of deterioration of the monitoring pixels MP or the image display pixels DP, Compensation is performed (ST5). That is, in the temperature equilibrium state, the deterioration detection value of the currently detected image display pixels DP is compared with the previously detected and stored previous deterioration detection values, and the deterioration compensation value is generated or updated according to the comparison value . When the deterioration compensation value is generated or updated, the voltage level corresponding to the deterioration compensation value is added or added to the OLED driving voltage (for example, VDD), the gamma reference voltage, or the analog gamma voltage level, do.

FIG. 7 is a view for explaining the step of detecting temperature equilibrium in the image display pixel region of FIG. 6. FIG. 8 is a graph comparing OLED threshold voltages of previously detected video display pixels with currently detected OLED threshold voltages according to driving time.

7 and 8, the data driver 4 includes at least one direction in which the image display pixels DP are arranged, for example, a vertically arranged direction (arrow direction (a) The current deterioration detection values Vnow sequentially detected in the direction (arrow direction (b)) are compared with the deterioration detection values of the previously detected and stored previous deterioration detection value Vint and the different pixels, . In this case, the current deterioration detection value Vnow of the image display pixels DP in which no deterioration has occurred is maintained at the same or similar width as the previous deterioration detection value Vint. However, the current deterioration detection value Vout of the deteriorated image display pixels DP is significantly different from the previous deterioration detection value Vint (the temperature unbalance interval in Fig. 8).

Accordingly, the data driving unit 4 only detects the temperature of the display pixels DP when the current deterioration detection value Vout included in the image display pixels DP is included in the upper and lower temperature equilibrium condition ranges according to the condition of the following equation (2) It is judged to be in an equilibrium state.

&Quot; (2) "

LSL? Vout? USL,

LSL = degree of deterioration - Temperature offset - Noise (V),

USL = temperature offset + noise (V) + degree of deterioration.

Here, "Vout" is the deterioration detection value of the deteriorated region, "LSL" is the lower temperature equilibrium condition according to the temperature rise, and "USL &

If deterioration occurs according to the temperature rise of the image display pixels DP and the image display characteristic, the deterioration detection value Vout may be sequentially decreased or increased. Therefore, only when the deteriorated current deterioration detection value Vout is included in the upper and lower temperature equilibrium condition ranges (LSL < Vout < USL), the temperature equilibrium state is determined and the upper and lower temperature equilibrium condition ranges ≤ USL), it is determined that the temperature is unbalanced because it is degraded or deteriorated.

For example, if the noise level is preset to 12 mV, and the deterioration value (deterioration degree) and the temperature offset are 0 V, the lower temperature equilibrium condition "LSL" according to the temperature rise can be 12 mV. 8, when the deterioration detection value of the image display pixel DP is detected to be -150 mV, the deterioration detection value of the image display pixel DP is lower than the lower temperature balance condition 12 mV according to the temperature rise Since it has been detected, it can be judged as a temperature non-equilibrium state. In this way, when the temperature of the video display pixels DP is determined to be in a non-equilibrium state, the deterioration detection value detection timing of the video display pixels DP and the monitoring pixels MP is set in advance (ST3).

According to the condition of Equation (2), only when the current deterioration detection value (Vout) deteriorated in the image display pixels (DP) is included in the upper and lower temperature equilibrium condition ranges, The deterioration compensation is performed by updating the deterioration compensation value according to the deterioration degree of the monitoring pixels MP or the image display pixels DP (ST5). That is, in the temperature equilibrium state, the deterioration detection value of the currently detected image display pixels DP is compared with the previously detected and stored previous deterioration detection values, and the deterioration compensation value is generated or updated according to the comparison value . When the deterioration compensation value is generated or updated, the voltage level corresponding to the deterioration compensation value is added or added to the OLED driving voltage (for example, VDD), the gamma reference voltage, or the analog gamma voltage level, do.

The organic light emitting diode display device and the driving method thereof according to the present invention detect the degree of deterioration of the organic light emitting diodes formed in at least one pixel region of the monitoring pixel region and the image display region, It is possible to improve the display quality of the image.

In addition, deterioration compensation performance and efficiency can be further improved by detecting the temperature equilibrium of at least one pixel region of the monitoring pixel region and the image display region and performing deterioration compensation by updating or maintaining the deterioration compensation value according to the detection result .

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

2: display panel 4: data driver
6: gate driver 8: timing controller
MP: monitoring pixel DP: display pixel

Claims (10)

A display panel on which a monitoring pixel region and an image display pixel region are formed;
A gate driver for driving gate lines of the display panel;
And driving the data lines of the display panel and maintaining or updating a deterioration compensation value according to deterioration degree and temperature balance of the organic light emitting diodes formed in at least one pixel region of the monitoring pixel region and the image display pixel region, A data driver for driving the data driver; And
And a timing controller for controlling the gate and the data driver so that an image is displayed in a video display pixel region of the display panel. The method according to claim 1,
The data driver
The method comprising: receiving deterioration detection values of respective video display pixels and monitoring pixels through a plurality of sensing lines to detect a deterioration level of the monitoring pixels and video display pixels;
Wherein the deterioration detection value detection timing of the video display pixels and the monitoring pixels is delayed after a predetermined period of time without generating or updating the deterioration compensation value when the temperature of the monitoring pixels is determined as an unbalanced state,
Wherein the deterioration compensating unit performs degradation compensation by generating or updating the degradation compensation value according to a deterioration degree of the monitoring pixels or the image display pixels when the temperature of the monitoring pixels is determined to be in an equilibrium state. 3. The method of claim 2,
The data driver
And comparing the current deterioration detection values, which are sequentially detected in at least one direction in which the monitoring pixels are arranged, with previous deterioration detection values and previously stored deterioration detection values and deterioration detection values of different pixels,
According to the conditions of the following formula (1)
[Equation 1]
Temperature equilibrium condition: mV (noise)? MAX (Vnow-Vint) - MIN (Vout-Vint)
(Vout-Vint) between the previous deterioration detection value "Vint" and the current deterioration detection value "Vout" of the deteriorated pixel and the current deterioration detection value "Vint" (Vnow-Vin) "of the value" Vnow " is smaller than or equal to a preset noise level "mV ". The method of claim 3,
The data driver
Determining whether the temperatures of the video display pixels are balanced or not by analyzing deterioration detection values of the video display pixels when the temperature of the monitoring pixels is determined to be in an equilibrium state,
Wherein the deterioration detection value detection timing of the video display pixels and the monitoring pixels is delayed after a predetermined period of time without generating or updating the deterioration compensation value if the temperature of the video display pixels is determined to be in an unbalanced state,
Wherein the deterioration compensating unit updates the degradation compensation value according to a deterioration degree of the monitoring pixels or the image display pixels when the temperature of the image display pixels is determined to be in an equilibrium state. 5. The method of claim 4,
The data driver
Comparing the current deterioration detection values sequentially detected in at least one direction in which the image display pixels are arranged with a previous deterioration detection value that has been detected and stored beforehand and a deterioration detection value of different pixels,
According to the condition of the following formula (2)
And determines the temperature equilibrium state only when the current deterioration detection value deteriorated in the image display pixels is included in the upper and lower temperature equilibrium condition ranges,
&Quot; (2) "
LSL? Vout? USL,
LSL = degree of deterioration - Temperature offset - Noise (V),
USL = temperature offset + noise (V) + degree of deterioration.
Here, "Vout" is the deterioration detection value of the deteriorated region, "LSL" is the lower temperature equilibrium condition according to the temperature rise, and "USL & . Driving gate lines of a display panel in which a monitoring pixel region and an image display pixel region are formed;
Performing degradation compensation by maintaining or updating a deterioration compensation value according to deterioration degree and temperature equilibrium of organic light emitting diodes formed in at least one pixel region of the monitoring pixel region and the image display pixel region; And
And driving the data lines of the display panel. The method according to claim 6,
The step of performing the degradation compensation
The method comprising: receiving deterioration detection values of respective video display pixels and monitoring pixels through a plurality of sensing lines provided on the display panel to detect a degree of deterioration of the monitoring pixels and video display pixels, Determining whether the ball is equilibrium,
Delaying the deterioration detection value detection timing of the video display pixels and the monitoring pixels after a predetermined time period without generating or updating the deterioration compensation value if the temperature of the monitoring pixels is determined to be in an unbalanced state;
And performing degradation compensation by generating or updating the deterioration compensation value according to deterioration degree of the monitoring pixels or the image display pixels when the temperature of the monitoring pixels is determined to be in an equilibrium state. . 8. The method of claim 7,
The step of determining whether the temperature of the monitoring pixels is balanced
And comparing the current deterioration detection values, which are sequentially detected in at least one direction in which the monitoring pixels are arranged, with previous deterioration detection values and previously stored deterioration detection values and deterioration detection values of different pixels,
According to the conditions of the following formula (1)
[Equation 1]
Temperature equilibrium condition: mV (noise)? MAX (Vnow-Vint) - MIN (Vout-Vint)
(Vout-Vint) between the previous deterioration detection value "Vint" and the current deterioration detection value "Vout" of the deteriorated pixel and the current deterioration detection value "Vint" (Vnow-Vin) "of the value" Vnow " is less than or equal to a predetermined noise level "mV ". 9. The method of claim 8,
The step of performing the degradation compensation
Determining whether the temperatures of the video display pixels are balanced by analyzing deterioration detection values of the video display pixels when the temperature of the monitoring pixels is determined to be in an equilibrium state,
Delaying the deterioration detection value detection timing of the video display pixels and the monitoring pixels after a predetermined time period without generating or updating the deterioration compensation value if the temperature of the video display pixels is determined to be in an unbalanced state;
Further comprising the step of performing the deterioration compensation by updating the deterioration compensation value according to a deterioration degree of the monitoring pixels or the image display pixels when the temperature of the image display pixels is determined to be in an equilibrium state, A method of driving a device. 10. The method of claim 9,
The step of determining whether the temperature of the image display pixels is balanced
Comparing the current deterioration detection values sequentially detected in at least one direction in which the image display pixels are arranged with a previous deterioration detection value that has been detected and stored beforehand and a deterioration detection value of different pixels,
According to the condition of the following formula (2)
And determines the temperature equilibrium state only when the current deterioration detection value deteriorated in the image display pixels is included in the upper and lower temperature equilibrium condition ranges,
&Quot; (2) "
LSL? Vout? USL,
LSL = degree of deterioration - Temperature offset - Noise (V),
USL = temperature offset + noise (V) + degree of deterioration.
Here, "Vout" is the deterioration detection value of the deteriorated region, "LSL" is the lower temperature equilibrium condition according to the temperature rise, and "USL & .

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