KR101548495B1 - Driving method of three dimension organic light emitting display device - Google Patents

Abstract

The present invention relates to a driving method of a 3D organic light emitting display device, capable of reducing time for sensing when applying an internal compensation method. The driving method of the 3D organic light emitting display device of the present invention comprises N sensing blocks by binding a plurality of gate lines equipped in an organic light emitting diode panel with the number of a unit during driving a 3D image, and sensing a threshold voltage of a driving thin film transistor equipped on pixels on the N sensing blocks by overlapping sensing time of a plurality of sensing blocks.

Description

TECHNICAL FIELD [0001] The present invention relates to a driving method of a three-dimensional organic light emitting display,

The present invention relates to a driving method of a three-dimensional organic light emitting display capable of reducing a sensing time when an internal compensation method is applied.

Recently, as the information age has come to the information age, a display field for visually expressing electrical information signals has been rapidly developed. In response to this, a variety of flat display devices having excellent performance such as thinning, light weight, and low power consumption have been developed. Device) is being developed.

Specific examples of such flat panel display devices include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display (FED) (Organic Light Emitting Device: OLED).

Particularly, the organic light emitting display device is a self-luminous display device, and has a response speed faster than other flat panel display devices, and has advantages of high luminous efficiency, luminance, and viewing angle, and has been attracting attention as a next generation display device. 2. Description of the Related Art In recent years, users' demands for realistic images have been increased, and an organic light emitting display device and a driving method capable of realizing a 3D (three-dimensional) image as well as a 2D (two-dimensional) image have been developed. A 3D image is implemented using a binocular parallax display of a user, a spectacle method using special glasses for stereoscopic purposes such as shutter glasses or polarized glasses, and a non-spectacular method using a lenticular lens, Developed.

1 is a view showing a method of implementing a three-dimensional image of a shutter glasses system according to the related art.

Referring to FIG. 1, a method of implementing a 3D image using a shutter glass utilizes a binocular disparity of a viewer, and two different two-dimensional images (a left eye image and a right eye image) are recognized through the left and right eyes of a viewer. Dimensional images are fused and recognized as three-dimensional images.

To realize the 3D image, the OLED panel displays left 2D image and right 2D image with time lag. At this time, only the left 2D image is transmitted during the period in which the left eye 2D image is displayed through the shutter glasses, and only the right eye 2D image is transmitted during the period in which the right eye 2D image is displayed. Here, a black image is inserted between the left eye 2D image and the right eye 2D image to prevent crosstalk between the left 2D image and the right eye 2D image. Through this, different 2D images are recognized with a time lag in the left and right eyes of the viewer, and the 2D images of the left and right eyes are fused to allow the viewer to recognize the 3D image.

The organic light emitting diode OLED is electrically connected between the source terminal of the driving TFT and the cathode power supply EVSS and emits light by the data current Ioled supplied from the driving TFT.

Each pixel of the organic light emitting display according to the related art has a data current flowing from the first driving power source EVDD to the organic light emitting diode OLED by switching the driving TFT DT according to the data voltage Vdata. And controls the size of the organic light emitting diode OLED to display a predetermined image.

However, there is a problem that the threshold voltage (Vth) / mobility characteristic of the driving TFT (DT) varies from pixel to pixel depending on the non-uniformity of the manufacturing process of the TFT. Accordingly, even if the same data voltage (Vdata) is applied to the driving TFT (DT) of each pixel in the OLED display device, there is a problem that uniform image quality can not be realized due to the deviation of current flowing in the organic light emitting diode (OLED).

2 is a view illustrating a method of driving a three-dimensional organic light emitting display according to a related art.

Referring to FIG. 2, the threshold voltage and mobility of the driving TFT DT of the pixels of the OLED panel are sensed by the internal compensation method to compensate the characteristic deviation of the driving TFT DT of each pixel. At this time, one sensing block is constituted by a predetermined number of gate lines, and the characteristics of the driving TFT formed in each pixel are sequentially sensed with a time difference for each sensing block.

After sensing the characteristics of the driving TFT DT of the pixels included in the first sensing block, image data is applied to emit the OLED of the pixels included in the first sensing block. When applying the image data to the pixels included in the first sensing block, the characteristic of the driving TFT (DT) of the pixels included in the second sensing block is sensed. Then, image data is applied to all the pixels included in the second sensing block to emit the OLED of the pixels included in the second sensing block. Thus, the characteristics of the driving TFT DT of pixels are sequentially sensed from the first sensing block to the last N-th sensing block. Here, the characteristics of the driving TFT DT of all the pixels included in one sensing block are simultaneously sensed.

In the sensing method of the related art, sensing operation of the next sensing block is performed after sensing driving of one sensing block is completed, and sensing time is secured for each sensing block, which increases the sensing time.

Referring to Table 1, the conventional three-dimensional organic light emitting diode display employing the internal compensation method has a problem that the data frequency increases because the frame frequency decreases by the sensing time necessary for each sensing block in 3D driving.

For example, if the time of one frame is 8.3ms and the sensing time is 20us for each sensing block, if the sensing block is composed of 108 sensing blocks, the total sensing time is 2.16ms (20us * 108Block = 2.16ms) do. When the time of one frame is 8.3 ms, a time of 2.16 ms is required for sensing all the pixels and a time of 1.2 ms for inserting a black image is required, so that the time for applying image data to all the pixels is reduced, A data frequency of 150 Hz to 200 Hz is required.

As a result, a driver IC having a high data frequency needs to be applied, resulting in an increase in manufacturing cost and an increase in power consumption. On the other hand, if the data frequency is lowered, there is another problem that the display quality of the 3D image is deteriorated.

The present invention provides a driving method capable of reducing a sensing time of a three-dimensional organic light emitting display device to which an internal compensation method is applied.

The present invention provides a driving method capable of lowering a data frequency of a three-dimensional organic light emitting display device to which an internal compensation method is applied.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an aspect of the present invention, there is provided a method of driving a three-dimensional organic light emitting display, comprising: forming N sensing blocks by grouping a plurality of gate lines provided in an organic light emitting diode panel, The sensing time of the plurality of sensing blocks is overlapped to sense the threshold voltage of the driving TFT included in the pixels of the N sensing blocks.

The present invention can reduce the sensing time of the three-dimensional organic light emitting display device to which the internal compensation method is applied.

The present invention can lower the data frequency of a three-dimensional organic light emitting display device to which an internal compensation method is applied.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 is a view showing a method of implementing a three-dimensional image of a shutter glasses system according to the related art.
2 is a view illustrating a method of driving a three-dimensional organic light emitting display according to a related art.
3 is a view schematically showing a three-dimensional organic light emitting display according to an embodiment of the present invention.
4 is a diagram showing an organic light emitting diode (OLED) and a pixel circuit included in the pixel shown in FIG.
5 is a view illustrating a method of driving a three-dimensional organic light emitting display according to an embodiment of the present invention.
FIG. 6 is a diagram showing a case in which a plurality of sensing blocks are sensed during a black screen inserting period and overlaps a threshold voltage sensing period of a plurality of sensing blocks.
7 is a diagram showing a method of sensing the threshold voltage of a driving TFT of all the pixels in a black screen inserting period.
8 is a view showing a method of turning on or off each of the left eye lens and the right eye lens of the shutter glasses when driving the 3D image.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It should be noted that, in the specification of the present invention, the same reference numerals as in the drawings denote the same elements, but they are numbered as much as possible even if they are shown in different drawings.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

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

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, embodiments of a driving method of a three-dimensional organic light emitting display according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a view schematically showing a three-dimensional organic light emitting display according to an embodiment of the present invention.

Referring to FIG. 3, a three-dimensional organic light emitting display 100 according to an embodiment of the present invention includes an OLED panel 110 and a panel driver. The panel driver includes a gate driver 120, a data driver 130, a timing controller 140, and a memory 150 in which initial compensation data is stored.

The OLED panel 110 includes a plurality of gate lines GL, a plurality of sense signal lines SL, a plurality of data lines DL, a plurality of driving power lines PL, and a plurality of reference voltage lines RL And a plurality of pixels P are defined by the lines.

The plurality of pixels P include an organic light emitting diode (OLED) and a pixel circuit. The differential voltage Vdata-Vref between the data voltage Vdata and the reference voltage Vref is charged to the capacitor C1 connected between the gate electrode and the source electrode of the driving TFT DT to which the first driving power supply EVDD is supplied And controls the data current Ioled flowing from the first driving power source EVDD to the second driving power source EVSS through the driving TFT DT to emit the organic light emitting diode OLED.

Each of the plurality of pixels P may be composed of any one of a red pixel, a green pixel, and a blue pixel. One unit pixel for displaying one image may be composed of a red pixel, a green pixel, and a blue pixel. In addition, one unit pixel may be composed of a red pixel, a green pixel, a blue pixel, and a white pixel.

The plurality of gate lines GL and the plurality of sense signal lines SL may be formed in the OLED panel 110 in parallel in the first direction (e.g., the horizontal direction). At this time, a scan signal (scan, gate drive signal) is applied to the gate line GL from the gate driver 120 of the panel driver. A sensing signal sense is applied from the gate driver 120 to the sense signal line SL.

The plurality of data lines DL may be formed in a second direction (e.g., vertical direction) so as to intersect the plurality of gate lines GL and the plurality of sense signal lines SL. At this time, the data voltage (Vdata) is supplied from the data driver 130 of the panel driver to the data line DL. The data voltage Vdata has a voltage level to which a compensation voltage corresponding to the shift of the threshold voltage Vth of the driving TFT DT of the pixel P is added.

A plurality of reference voltage lines RL are formed in parallel with each of the plurality of data lines DL. The reference voltage line RL may be selectively supplied with a display reference voltage or a sensing precharging voltage from the data driver 130. The display reference voltage or the sensing precharging voltage may be supplied to the plurality of reference voltage lines RL to detect the threshold voltage / mobility of the driving TFT DT of each pixel P during the sensing period.

A plurality of driving power supply lines PL may be formed in parallel with the data lines DL and supply a first driving power source EVDD supplied from the data driver 130 to the pixels P.

4 is a diagram showing an organic light emitting diode (OLED) and a pixel circuit included in the pixel shown in FIG. 4 illustrates one pixel among a plurality of pixels formed in the OLED panel 110. [

4, each of the plurality of pixels P charges the capacitor C1 with the difference voltage Vdata-Vref between the data voltage Vdata and the reference voltage Vref during the data charging period, And a pixel circuit for supplying the current Ioled to the organic light emitting diode OLED.

The pixel circuit includes a first switching TFT (ST1), a second switching TFT (ST2), a driving TFT (DT), and a capacitor (C1). Here, the TFTs ST1, ST2, and DT may be an a-Si TFT, a poly-Si TFT, an oxide TFT, an organic TFT, or the like as an N-type TFT. However, the present invention is not limited to this, and the TFTs ST1, ST2, and DT may be formed of a P-type TFT.

The first switching TFT ST1 includes a gate electrode connected to the gate line GL, a source electrode (first electrode) connected to the data line DL and a first node N1 connected to the gate electrode of the driving TFT DT (Second electrode) connected to the drain electrode. The first switching TFT ST1 is turned on in response to a scan signal of a gate-on voltage level supplied to the gate line GL to turn on the data voltage Vdata supplied to the data line DL To the gate electrode of one node N1, that is, the driving TFT DT.

The second switching TFT ST2 includes a gate electrode connected to the sense signal line SL, a source electrode (first electrode) connected to the reference voltage line RL, and a driving TFT DT and an organic light emitting diode OLED And a drain electrode (second electrode) connected to the connected second node N2. The second switching TFT ST2 is turned on according to a sensing signal sense of a gate-on voltage level supplied to the sense signal line SL, And supplies a reference voltage or a sensing pre-charging voltage to the second node N2.

The capacitor C1 is connected between the gate electrode and the drain electrode of the driving TFT DT, that is, between the first node N1 and the second node N2. This capacitor C1 charges the difference voltage of the voltage supplied to each of the first node N1 and the second node N2.

The driving TFT DT includes a gate electrode commonly connected to the drain electrode of the first switching TFT (ST1) and the first electrode of the capacitor (C1). The driving TFT DT includes a source electrode connected to the driving power supply line PL. The driving TFT DT includes a drain electrode of the second switching TFT ST2, a second electrode of the capacitor C1, and a drain electrode commonly connected to the anode of the organic light emitting diode OLED. The driving TFT DT controls the amount of current flowing to the organic light emitting diode (OLED) by being turned on by the voltage of the capacitor (C1) in each emission period.

The organic light emitting diode OLED emits light with a luminance corresponding to the data current Ioled by the data current Ioled supplied from the pixel circuit, i.e., the driving TFT DT.

The timing controller 140 operates the gate driver 120 and the data driver 130 in the display mode and converts the analog image data inputted from the outside into the digital image data of the frame unit, .

The timing controller 140 generates a data control signal DCS and a gate control signal DCS for operating the gate driver 120 and the data driver 130 in the display mode or the sensing mode based on the timing synchronization signal TSS in the sensing mode, (GCS). The timing controller 140 supplies a data control signal DCS and a gate control signal GCS to the gate driver 120 and the data driver 130.

In addition, the timing controller 140 generates a first shutter eyeglass control signal for controlling the on-off state of the left eye lens and the right eye lens of the shutter glasses in the display mode. Then, the generated first shutter glasses control signal is transmitted to the shutter glasses.

In accordance with the first shutter eyeglasses control signal transmitted from the timing controller 140, the shutter eyeglasses turn on the left eye lens of the shutter eyeglasses and turn off the right eye lens during the period of displaying the left eye image. During the period in which the right-eye image is displayed, the right eye lens of the shutter glasses is turned on and the left eye lens is turned off.

In addition, the timing controller 140 generates a second shutter eyeglasses control signal for turning off the left eye lens and the right eye lens of the shutter glasses in the sensing mode. Then, the generated second shutter glasses control signal is transmitted to the shutter glasses. The shutter glasses turn off the left eye lens and the right eye lens during the sensing period in accordance with the second shutter eyeglass control signal transmitted from the timing controller 140. [

The sensing mode may be performed in real time during an initial driving time of the OLED panel 110, an end time after the OLED panel 110 is driven for a long time, or a period of displaying an image on the OLED panel 110.

The timing synchronization signal TSS may be a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable DE, a clock DCLK, or the like. The gate control signal GCS may include a gate start signal and a plurality of clock signals. The data control signal DCS may be a data start signal, a data shift signal, a data output signal, or the like.

The gate driver 120 is connected to a plurality of gate lines GL and a plurality of sense signal lines SL and operates in a display mode and a sensing mode according to the mode control of the timing controller 140.

In the display mode, the gate driver 120 generates a scan signal (scan) having a gate-on voltage level every one horizontal period according to the gate control signal GCS supplied from the timing controller 140. And sequentially supplies the generated scan signal (scan) to the plurality of gate lines GL.

The scan signal scan has a gate-on voltage level during the data charging period of each pixel P and has a gate-off voltage level during the light emission period of each pixel P. The gate driver 120 may be a shift register that sequentially outputs a scan signal (scan).

Meanwhile, in the sensing mode, the gate driver 120 generates a sense signal sense of a gate-on voltage level and supplies a sense signal sense to the sense signal line SL. At this time, a sense signal may be supplied for each sensing block. A sense signal sense is simultaneously supplied to a plurality of sense signal lines SL included in one sensing block so that the sensing of the threshold voltage Vth of the driving TFT DT of all the pixels included in one sensing block .

The gate driver 120 may be formed in the form of an integrated circuit (IC), or may be integrated in the array substrate of the OLED panel 110 together with the transistor formation process of each pixel P.

In the display mode, the data driver 130 generates analog data voltages according to the digital image data and supplies the analog data voltages to the plurality of data lines DL to emit OLEDs formed in each pixel.

The data driver 130 supplies a display reference voltage or sensing precharging voltage for sensing the threshold voltage of the driving TFT DT of all the pixels of the OLED panel 110 to a plurality of reference voltage lines RL, . Here, the threshold voltage sensing of the driving TFTs of all the pixels formed in the OLED panel 110 may be sequentially performed for the red pixel, the green pixel, and the blue pixel.

FIG. 5 illustrates a method of driving a three-dimensional organic light emitting display according to an exemplary embodiment of the present invention. FIG. 6 illustrates sensing of a plurality of sensing blocks during a black screen insertion period, Are overlapped with each other.

Referring to FIGS. 5 and 6, when a 3D image is driven, one sensing block is configured in units of a predetermined number of gate lines, and the characteristics of the driving TFT formed in pixels are sensed for each sensing block. That is, a plurality of gate lines provided in the OLED panel 100 are grouped into a number of N sensing blocks, and a threshold voltage of a driving TFT of pixels formed in the N sensing blocks is sensed.

For example, when 1080 gate lines are formed on an OLED panel, a single sensing block may be formed for each of 10 gate lines to constitute a total of 108 sensing blocks.

Here, when the 3D image is driven, N sensing blocks are sensed in the black screen inserting period, and the sensing times of the plurality of sensing blocks are overlapped. As described above, the sensing time of the plurality of sensing blocks is overlapped in the black screen inserting period, and the time for sensing the characteristics of the driving TFTs of all the pixels can be reduced.

On the other hand, when the 2D image is driven, N sensing blocks are sequentially sensed without overlapping the sensing time of the plurality of sensing blocks.

Hereinafter, a specific example of sensing the characteristics of the driving TFT of all the pixels formed on the OLE panel when the 3D image is driven will be described.

A sense signal is simultaneously supplied to a plurality of sense signal lines SL formed in the first sensing block to sense the characteristics of the driving TFT DT of the pixels included in the first sensing block. At this time, the characteristics of the driving TFT DT of all the pixels included in the first sensing block are simultaneously sensed. Then, the black image data is applied to the pixels included in the first sensing block to prevent the OLED of the pixels included in the first sensing block from emitting light. Then, a data voltage is applied to the pixels included in the first sensing block to emit the OLED of the pixels included in the first sensing block.

A sense signal is simultaneously supplied to the plurality of sense signal lines SL formed in the second sensing block so as to overlap with the sensing time of the first sensing block so that the driving TFTs of the pixels included in the second sensing block DT). At this time, the characteristics of the driving TFT DT of all the pixels included in the second sensing block are simultaneously sensed. Then, the black image data is applied to the pixels included in the second sensing block to prevent the OLED of the pixels included in the second sensing block from emitting light. Then, a data voltage is applied to the pixels included in the second sensing block to emit the OLED of the pixels included in the second sensing block.

Then, a sense signal is simultaneously supplied to the plurality of sense signal lines SL configured in the third sensing block so as to overlap with the sensing time of the first sensing block and the sensing time of the second sensing block, And senses the characteristics of the driving TFT DT of the pixels included in the sensing block. At this time, the characteristics of the driving TFT DT of all the pixels included in the third sensing block are simultaneously sensed. Then, the black image data is applied to the pixels included in the third sensing block to prevent the OLED of the pixels included in the third sensing block from emitting light. Then, a data voltage is applied to the pixels included in the third sensing block to emit the OLED of the pixels included in the third sensing block.

By applying the sensing method described above, it is possible to sense the characteristics of the driving TFT of each of the pixels arranged in the first sensing block to the third sensing block.

Sensing and black image insertion are performed for 20s per sensing block and the sensing time of the plurality of sensing blocks is overlapped to complete the sensing of the three sensing blocks and the insertion of the black image for 28us.

After the black image inserting time of the third sensing block, a sense signal is simultaneously supplied to the plurality of sense signal lines SL formed in the fourth sensing block, and the driving TFT DT of the pixels included in the fourth sensing block ). At this time, the characteristics of the driving TFT DT of all the pixels included in the fourth sensing block are simultaneously sensed. Then, the black image data is applied to the pixels included in the fourth sensing block to prevent the OLED of the pixels included in the fourth sensing block from emitting light. Then, a data voltage is applied to the pixels included in the fourth sensing block to emit the OLED of the pixels included in the fourth sensing block.

If the black image insertion time for applying the black image data to the first sensing block overlaps the sensing time for the second to Nth sensing blocks after the first sensing block, sensing is impossible.

Therefore, the sensing time of the first sensing block and the black image inserting time of applying the black image data to the second sensing block and the third sensing block are not overlapped. Also, the sensing time of the first sensing block and the black image inserting time of applying the black image data to the fourth sensing block are not overlapped. That is, the black image insertion time for applying the black image data to the first sensing block to the Nth sensing block and the sensing time of the first sensing block are not overlapped. This enables the sensing of all the pixels.

Then, a sense signal is simultaneously supplied to the plurality of sense signal lines SL formed in the fifth sensing block so as to overlap with the sensing time of the fourth sensing block, so that the driving TFTs of the pixels included in the fifth sensing block DT). At this time, the characteristics of the driving TFT DT of all the pixels included in the fifth sensing block are simultaneously sensed. Then, the black image data is applied to the pixels included in the fifth sensing block to prevent the OLED of the pixels included in the fifth sensing block from emitting light. Then, a data voltage is applied to the pixels included in the fifth sensing block to emit the OLED of the pixels included in the fifth sensing block.

Subsequently, a sense signal is simultaneously supplied to a plurality of sense signal lines (SL) formed in the sixth sensing block so as to overlap with the sensing time of the fourth sensing block and the sensing time of the fifth sensing block, And senses the characteristics of the driving TFT DT of the pixels included in the sensing block. Then, the black image data is applied to the pixels included in the sixth sensing block to prevent the OLED of the pixels included in the sixth sensing block from emitting light. At this time, the characteristics of the driving TFT DT of all the pixels included in the sixth sensing block are simultaneously sensed. Then, a data voltage is applied to the pixels included in the sixth sensing block to emit the OLED of the pixels included in the sixth sensing block.

By applying the sensing method described above, it is possible to sense the characteristics of the driving TFT of each of the pixels arranged in the fourth to sixth sensing blocks.

Here, the sensing time of the fourth sensing block and the black image inserting time of applying the black image data to the fifth sensing block and the sixth sensing block are not overlapped. In addition, the sensing time of the fourth sensing block and the black image inserting time of applying the black image data to the seventh sensing block are not overlapped.

By applying the above-described sensing method in the same way, it is possible to sense the characteristics of the driving TFT of each of the pixels arranged in the seventh sensing block to the N-th sensing block. Thus, in the black image inserting period, the characteristics of the driving TFT DT of the pixels can be sequentially sensed from the first sensing block to the last Nth sensing block.

7 is a diagram showing a method of sensing the threshold voltage of a driving TFT of all the pixels in a black screen inserting period.

Referring to FIG. 7, the sensing of the threshold voltage of the driving TFTs of all the pixels formed in the OLED panel 110 may be sequentially performed for red, green, and blue pixels.

The threshold voltage of the driving TFT of the red pixel is sensed from the first sensing block to the last Nth sensing block. Next, the threshold voltage of the driving TFT of the green pixel is sensed from the first sensing block to the last N-th sensing block. Then, the threshold voltage of the driving TFT of the blue pixel is sensed from the first sensing block to the last N-th sensing block. In this manner, the threshold voltages of the driving TFTs of all red pixels, green pixels, and blue pixels are sensed from the first sensing block to the last Nth sensing block.

8 is a view showing a method of turning on or off each of the left eye lens and the right eye lens of the shutter glasses when driving the 3D image.

Referring to FIG. 8, the threshold voltage of the driving TFT of all the pixels is sensed from the first sensing block to the last N-th sensing block. Thereafter, the data voltages are supplied from the RGB pixels sharing the first gate line GL1 to the RGB pixels sharing the last gate line GLk, so that when all pixels emit light, the left eye lens and the right eye lens of the shutter glasses Turn on or turn off. At this time, the left eye lens of the shutter glasses is turned on and the right eye lens is turned off during the period in which the left eye image is displayed. During the period in which the right-eye image is displayed, the right eye lens of the shutter glasses is turned on and the left eye lens is turned off.

All the pixels formed on the OLED panel are different from each other at the time of driving the 3D image, but it is recognized that all the pixels emit light simultaneously to the viewer due to the on-off of the right eye lens and the left eye lens of the shutter glasses.

Referring to Table 2, when the time of one frame is 8.3 ms and the time of inserting the black image is set to 1.2 ms in the 3D image driving, 108 sensing blocks are sensed in the black image inserting time (1.2 ms) It is possible to reduce the time for sensing the characteristics of the driving TFT.

Therefore, when the time of one frame is 8.3 ms, it takes 1.2 ms for the sensing of all the pixels and the black image insertion, and the time for applying the image data to all the pixels can be increased. As a result, a data frequency of 130 Hz to 140 Hz is required depending on the 3D sea, thereby reducing the data frequency compared to the prior art.

It will be understood by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: organic light emitting display
110: OLED panel
120: gate driver
130: Data driver
140: Timing controller
150: Memory

Claims (5)

When driving a three-dimensional image, N sensing blocks are formed by grouping a plurality of gate lines provided in the organic light emitting diode panel,
Sensing the threshold voltage of the driving TFT included in the pixels of the N sensing blocks by overlapping the sensing time of the plurality of sensing blocks,
And applying black image data to pixels of each of the N sensing blocks after a sensing time of each of the N sensing blocks. The method according to claim 1,
At the black image insertion time during one frame time,
And driving a plurality of sensing signal lines of the N sensing blocks to sense a threshold voltage of a driving TFT included in the pixels of the N sensing blocks. delete The method according to claim 1,
Wherein a black image inserting time for applying black image data to the first sensing block to an Nth sensing block and a sensing time of the first sensing block are not overlapped with each other. The method according to claim 1,
Wherein the data voltage is supplied to all the pixels of the organic light emitting diode panel, and then the left eye lens and the right eye lens of the shutter glasses are turned on or off.

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