DE102012109738A1 - Organic light emitting display device scans threshold voltage of driving transistor in scan interval, and controls light emission of organic light emitting element in pixel area at a display interval - Google Patents

Abstract

The device has pixel region that is provided with a scan line and a data line that are arranged intersecting each other. A driver transistor drives the organic light emitting element. A circuit scans threshold voltage of the driving transistor in a scan interval, and controls light emission of the organic light emitting element in the pixel area at a display interval. An independent claim is included for method for operating organic light emitting display device.

Description

The present application claims the priority of filed on October 12, 2011 Korean Patent Application No. 10-2011-0104184 , which is hereby incorporated by reference in its entirety.

Background of the invention

Embodiments relate to an organic light-emitting display device. Devices for displaying information have been developed in many ways. The display devices include liquid crystal display devices (LCD), organic light emitting display devices (OLED), electrophoresis display devices, field emission display devices (FED), and plasma display devices.

Among these display devices, OLED devices have the characteristics of low power consumption, larger viewing angle, lower weight, and higher luminance compared to LCD devices. Therefore, OLED devices are considered the future generation of display devices.

Thin-film transistors used in organic light-emitting display devices can be operated at high speeds. For this purpose, the thin film transistors increase the carrier mobility by using a semiconductor layer formed of polycrystalline silicon. Polycrystalline silicon can be obtained by a crystallization process of amorphous silicon.

In the crystallization process, a laser scanning method is often used. During the crystallization process, the power of the laser beam may vary. Therefore, thin-film transistors that are generated on the scanned line scanned by the laser beam may have mutually different threshold voltages. This can lead to inconsistent image qualities between pixel areas.

In order to solve this problem, there has been proposed a technique of detecting the threshold voltage of the pixel areas and compensating the threshold voltages of the thin film transistors.

However, in order to realize such a compensation of the threshold voltage, not only a transistor for detecting the threshold voltage within the pixel area needs to be added, but also signal lines for controlling the thin film transistors must be added. For this reason, the pixel area becomes complex and passage of the pixel area decreases.

Overview of the invention

In this regard, the embodiments relate to an organic light emitting display device that substantially obviates one or more of the problems due to limitations and disadvantages of the prior art.

The embodiments serve to provide an organic light-emitting display device configured to prevent the unevenness (or deterioration) of the image quality due to the threshold voltage and mobility (for example, the carriers).

Also, the embodiments are to provide an organic light-emitting display device that enables a system to compensate for a threshold voltage and mobility, so that the circuitry of a pixel area is simplified and the transmission rate of the pixel area is increased.

Additional features and advantages of the embodiments will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the embodiments. The advantages of the embodiments are realized and attained by the structure which can be found in detail in the written description, the present claims and also the appended figures.

According to a general aspect of the present embodiment, an organic light emitting display device includes: an organic light emitting panel having a plurality of pixel areas, each pixel area having a scan line and a data line crossing each pixel area further including an organic light emitting element and a drive transistor for driving the light emitting element organic light emitting element has; and a circuit configured to detect a threshold voltage of the driver transistor in a scan interval and to control a light emission of the organic light emitting element within the pixel area at a display interval.

According to various embodiments, the scan interval and the display interval may be included in a single frame (also referred to as a frame).

In various embodiments, the scan interval may correspond to a vertical display gap of a vertical synchronous signal.

In various embodiments, the display interval may correspond to a period between two consecutive vertical display gaps. In various embodiments, the organic light emitting display device may include a scan driver driver for generating a first scan signal and a plurality of second scan signals and for selectively providing the first scan signal and the second scan signals to the organic light emitting panel.

According to various embodiments, the scan driver may include a first scan signal generator for generating the first scan signal within the scan interval; a second scan signal generator for generating the second scan signals at the display interval; and a multiplexer for selectively providing the first scan signal and the second scan signals to the organic light-emitting panel.

According to various embodiments, the multiplexer may be configured to selectively output the first scan signal to each display frame and to selectively output the second scan signals via the scan line to the organic light emitting panel during the display interval.

According to various embodiments, the circuit for calculating offset information may be configured based on the threshold voltage and for generating the second image signal in consideration of the offset information of the first image signal.

According to various embodiments, the organic light emitting display device may further comprise a data driver for detecting the threshold voltage of the organic light emitting panel and for providing data voltages corresponding to the second image signal to the organic light emitting panel.

According to various embodiments, the data driver may include a digital-to-analog converter (DAC) for converting the second image signal into data voltages corresponding to analog signals, an analog-to-digital converter (ADC) Converting the first scan information having the threshold voltage corresponding to the analog signal into a second scan information according to the digital signal and a switching control selection device for selectively connecting the organic light emitting panel data lines to either the DAC or the ADC.

According to various embodiments, the circuit may include an offset matcher for computing the offset information based on the threshold voltage and for storing the offset information, and a data matcher for generating a second display signal in consideration of the offset information of a first image signal.

According to various embodiments, the offset controller may include an offset LUT (look-up table) in which the offset information corresponding to a plurality of threshold voltages is stored in a tabular form.

According to a general aspect of the present embodiment, in a method of operating the organic light emitting display device having an organic light emitting panel, the organic light emitting display device may have a plurality of pixel regions, each pixel region having a scan line and a data line crossing each other Pixel region further comprises an organic light emitting element and a driver transistor for driving the organic light emitting element. The method may include scanning a threshold voltage of the driver transistor in a scan interval, and controlling a light emission of the organic light emitting element within the pixel area and a display interval.

Other systems, methods, features, and advantages may be apparent to those skilled in the art by reviewing the following figures and detailed description. It is intended that all such additional systems, methods, features, and advantages be part of this description, be within the scope of the present disclosure, and be protected by the following claims. No part of the description here represents a limitation of the claims. Further aspects and advantages will be explained below with reference to the exemplary embodiments. The general description and the following detailed description of the present disclosure are, of course, to be considered as exemplary and explanatory only and serve to further explain the claimed disclosure.

Brief description of the figures

The appended drawings, which are included to provide a further understanding of the invention and are incorporated in with part to form this description, embodiments of the invention and together with the description serve to explain the principles of the invention.

1 FIG. 12 is a block diagram showing an organic light emitting display device according to an embodiment of the present disclosure; FIG.

2 shows a circuit diagram of an organic light-emitting panel 1 ;

3 shows a circuit diagram of a pixel area 2 ;

4 shows a waveform diagram in which signals for detecting a scan voltage are shown;

5A to 5C show circuit diagrams representing switching states of the transistors when the pixel area is driven at time intervals;

6 shows a block diagram of a scan driver 1 ;

7 shows a waveform diagram illustrating the signals used to drive the scan driver in FIG 1 to be used;

8th shows a block diagram in which a data driver 1 is shown schematically;

9 shows a block diagram in which a controller 1 is shown schematically; and

10 shows a block diagram in which an offset controller 9 is shown.

Detailed description

In the present specification, it is to be understood that when an element such as a substrate, a layer, a region, a foil or an electrode is referred to as "on" or "under" another element in the embodiments, apply them directly to or may be below the other element, or other intermediate elements (indirect) may be present. The term "on" or "under" an element refers to the representation in the figures.

Reference will now be made in detail to some embodiments of the present invention, examples of which are shown in the attached drawings. In the figures, the sizes and thicknesses of elements may be exaggerated, omitted, or simplified for purposes of clarity and simplicity of illustration, without depicting the true size of the elements.

1 FIG. 10 is a block diagram illustrating an organic light emitting display device according to an embodiment of the present disclosure. FIG. Referring to 1 For example, the organic light emitting display device according to an embodiment of the present disclosure may be an organic light emitting panel 10 , a controller 30 , a scan driver 40 and a data driver 50 exhibit.

The scan driver 40 may comprise a scan signal comprising a first scan signal and a second scan signal S for an organic light-emitting panel 10 provide.

The data driver 50 can data voltages V'data for the organic light-emitting panel 10 provide.

The organic light-emitting panel 10 A plurality of scan lines GL1~GLn, a plurality of data lines DL1~DLn, a plurality of first power supply lines PL1 to PLm, and a plurality of second power supply lines PL'1 to PL'm, as shown in FIG 2 shown, have.

Although not shown in the figures, the organic light-emitting panel 10 further comprise a plurality of signal lines.

A plurality of pixel areas P may be defined by the scan lines GL1 to GLn and the data lines DL1 to DLn crossing each other. These pixel areas P may be arranged in a matrix form.

Each of the pixel areas P may be electrically connected to the scan lines GL1 to GLn, the data lines DL1 to DLn, the first power supply lines PL1 to PLn, and the second power supply lines PL'1 to PL'n.

For example, the scan lines GL1 to GLn may be electrically connected to the plurality of pixel areas P in a horizontal direction. The data lines DL1 to DLn may be electrically connected to the plurality of pixel areas P in a vertical direction.

Such a pixel region P may receive a scan signal S, a data voltage V'data, and a first power supply voltage VDD and a second power supply voltage VSS.

More specifically, the scan signal S may be sent to the scan line GL1 to GLn Pixel area can be provided and the data voltage V'data can be provided by means of the data lines DL1 to DLn the pixel area. Also, the first power supply voltage VDD and the second power supply voltage VSS may be provided to the pixel region P, respectively, by the first power supply lines PL1 to PLn and the second power supply lines PL'1 to PL'n, respectively.

Meanwhile, a scan information Sensing1 having a threshold voltage Vth of the pixel area can be obtained from the pixel area P. The scan information Sensing1 can be sent from the pixel area P to the outside, for example to the data driver 50 out 1 via the data line DL1 ~ DLm or to an individual acquisition controller independent of the data driver 50 to be provided.

A first to third transistor T1~T3, a storage capacitor Cst, a charging capacitor Cload, and an organic light emitting element OLED may be present in each pixel region P, but not limited thereto. In other words, the number of transistors and a connection structure between them within a pixel area may be varied in a variety of shapes by the designer. As such, the present embodiment can be adapted to any circuit structure of the designer-modifiable pixel areas.

The first and second transistors T1 and T2 may be switching transistors for signal transmission. The third transistor T3 may be a driver transistor for generating a drive current for driving the organic light emission element OLED.

The storage capacitor Cst may function to maintain the data voltage Vdata for one frame period. The charging capacitor Cload may charge an externally charged precharging data voltage Vpre and provide the charged precharging data voltage Vpre to the organic light emitting element OLED. The charging capacitor Cload may further provide the scan information Sensing1, which has the threshold voltage Vth of the third transistor T3 and the mobility μ, to the outside.

The organic light emitting element OLED emits light. The organic light emitting element OLED can emit light having a brightness that varies with the drive current. Such an organic light emitting element OLED may include a red organic light emitting element for emitting red light, a green organic light emitting element for emitting green light and a blue organic light emitting element for emitting blue light.

The first to third transistors T1~T3 may be PMOS thin film transistors, but are not limited to these. The first to third transistors T1 ~ T3 may be turned on by means of a low-level signal and turned off by means of a high-level signal.

The high level may become a ground potential or a voltage approaching ground potential. The low level can become a voltage below ground potential. For example, the low and high levels may be -10V and 0V, respectively, but are not limited thereto.

The first power supply voltage VDD may be a high level signal. The second power supply voltage VSS may be a low level signal. The first and the second power supply voltages VDD and VSS may be a DC voltage (DC) with a constant level.

In 3 the scan line GL is shown. Likewise shows 3 in that a scan signal S is provided for the scan line GL.

However, the scan signal S is always generated in substantially the same waveform. This makes it possible to provide the same scanning signal for the first and second transistors T1 and T2. In accordance therewith, the scan line GL may be formed as a single line and a single scan signal may be forwarded via the single scan line. In alternative embodiments, two scan lines may be provided.

The charging capacitor Cload may be connected to the data line DL. Therefore, the charging capacitor Cload can charge the pre-charge data voltage Vpre and the data voltage provided via the data line DL. In addition, the charging capacitor Cload may charge the scan information Sensing1 having the threshold voltage Vth when the scan information Sensing1 is detected. The scan information Sensing1 loaded into the charging capacitor Cload can be supplied to the outside via the data line DL. In alternative embodiments, the scan information Sensing1 may be loaded into an additional capacitor which may be connected to an additional scan line.

A gate electrode of the first transistor T1 may be connected to the first scan line LG at which the first scan signal S is provided. A source of the first transistor T1 may be connected to the data line DL. A drain of the first transistor T1 may be connected to a first node.

Such a first transistor T1 may be turned on by the low-level scan signal S provided to the scan line GL, and allow the data voltage V'data used for displaying an image to be transmitted to the first node via the data line DL load.

The first node may be commonly connected to the drain of the first transistor T1, the storage capacitor Cst, a source of the third transistor T3 and the first supply line PL.

A gate electrode of the second transistor T2 may be connected to the first scan line GL at which the scan signal S is provided. A source of the second transistor T2 may be connected to the reference line provided with a reference voltage Vref. A drain electrode of the second transistor T2 may be connected to a second node.

Such a second transistor T2 may be turned on by the low-level scan signal S provided to the scan line GL and allow the second node to be discharged to the reference voltage.

The second node may be commonly connected to the drain of the second transistor T2 and a gate of the third transistor T3.

The storage capacitor Cst may be connected between the first node and the second node. The storage capacitor Cst may allow the voltage at the second node to be varied with the change in the voltage of the first node.

The gate electrode of the third transistor T3 can be connected to the second node. The source of the third transistor T3 may be connected to the first supply line PL.

The third transistor T3 may generate a drive current that varies with the voltage at the second node. Also, the third transistor T3 may provide the driving current to the organic light emitting element OLED.

The organic light emitting element OLED can emit light due to the drive current of the third transistor T3.

Even if not in the 3 As shown, another transistor may be disposed between the first supply line PL and the third transistor T3, which is switched by a light emission signal.

Such a circuit arrangement of the pixel area, as shown in the 3 can be represented by signals in waveform, as shown in 4 are shown, are controlled.

As in 4 As shown, the circuitry within the pixel area may be driven in accordance with three individual intervals.

A first interval P1 is a portion which serves to charge the data voltage V'data to the charging capacitor Cload. A second interval P2 corresponds to another portion which is used either to scan the threshold voltage of the third transistor T3 which is a driver transistor or to drive the organic light emitting element OLED. A third interval P3 corresponds to yet another section which serves to provide the requested threshold voltage to the outside.

The operation of the pixel array circuit will be described below in detail for each of the three intervals with reference to FIGS 5A to 5D described.

<First interval>

As in 5A As shown, the first scan signal S having a high level may be provided to the scan line GL in the first interval P1.

Thus, the first and second transistors T1 and T2 can be turned off by the high level scan signal S. In addition, the data voltage V'data can be charged to the charging capacitor Cload in the first interval. At this time, the source voltage at the first node may hold the previous data voltage loaded in a previous frame.

<Second interval>

As in 5B 1, the scan signal S may be provided at a low level in the second interval P2 for the scan line GL.

The low level scan signal S may allow the first and second transistors T1 and T2 to be turned off. As a result, the data voltage V'data which has been charged into the charging capacitor Cload can be detected by the first transistor T1 are charged to the first node and the reference voltage Vref can be charged by the second transistor T2 to the second node. At this time, a driving current from the third transistor T3 may be provided to the organic light emitting element OLED so as to allow the organic light emitting element OLED to emit light.

During the second interval P2, the voltage Vs at the first node may be discharged as a threshold voltage of the third transistor T3. The threshold voltage Vth can be charged by the first transistor T1 into the charging capacitor Cload. In other words, the threshold voltage Vth of the third transistor T3 can be interrogated during the second interval P2.

Meanwhile, the organic light emitting element OLED can emit light until the voltage Vs at the first node becomes equal to the threshold voltage Vth of the third transistor T3. In various embodiments, at least one of the first transistor T1 and the second transistor T2 remains turned on until the threshold voltage Vth of the third transistor T3 is reached.

<Third Interval>

As in 5C 1, the high level scan signal S may be provided to the scan line GL in the third interval P3.

The high level scan signal S may force the first and second transistors T1 and T2 to be turned off.

Also, in the third interval P3, the threshold voltage Vth charged in the charging capacitor Cload can be output to the outside via the data line DL as scan information, ie, a selector 54 , as in 8th shown to be provided.

In the embodiment, such first to third intervals P1 to P3 may allow the scan information, including the threshold voltage Vth, to be provided to the outside.

As in 6 the scan driver can be displayed 40 a first scan signal generator 42 , a second scan signal generator 44 and a multiplexer 46 contain.

The first scan signal generator 42 may generate a first scan signal for a scan interval in each frame. The first scan signal may be provided to one of the many scan lines GL1~GLn.

The second scan signal generator 44 may generate second scan signals for a display interval in each frame. The second scanning signals are sequentially sent to the scanning lines GL1~GLn of the organic light-emitting panel 10 provided.

A single frame can be defined in the scan interval and the display interval. The scan interval may be a vertical display gap of a vertical synchronous signal Vsync, but is not limited thereto. The display interval may also be the same as the distance between the vertical display gaps of the vertical synchronous signal Vsync, but is not limited thereto.

The scanning interval and / or the display interval may be varied in accordance with a brightness resolution of the organic light-emitting panel 10 , For example, if the organic light-emitting panel has FHD (Full High Definition) at a frequency of 120 Hz, the scan interval may be approximately 400 μs and / or the display interval may be approximately 8 ms, for example.

Thus, the first scan signal can be generated only once in each frame, as in FIG 7 is shown. The first scan signal may be any of the many scan lines GL1~GLn of the organic light emitting panel 10 be provided in each frame.

The second scanning signals may be in accordance with the number of scanning lines in the organic light-emitting panel 10 generated and sequentially provided to the scan lines GL1 ~ GLn every frame. In this case, the second scan signal may correspond to the pulse width of a horizontal synchronous signal, but is not limited thereto.

For example, the first scan signal can be generated and the first scan line GL1 of the organic light-emitting panel 10 , are provided in the vertical display gap of the vertical synchronous signal Vsync within a single frame (frames). Thus, the threshold voltages Vth of the third transistors T3, ie, the driver transistors in the pixel areas connected to the first scan line GL1, respectively, can be interrogated (in other words, detected or measured). Also in the vertical display gap of the vertical synchronous signal of the next frame, the first scan signal can be generated and the second scan line GL2 of the organic light-emitting panel 10 to be provided. Therefore, the first scan signal generated once every frame may be the scan lines GL1~GLn are provided during the duration of the frames according to the number of scan lines GL1~GLn.

For a duration other than the duration of the display gap of the vertical synchronous signal of each frame, which corresponds to the display interval, the second scan signals may be sequentially generated and the organic light emitting panel scan lines GL1~GLn 10 to be provided. The organic light emitting element OLED within the pixel region P, which is connected to each of the scan lines GL1~GLn, can emit light through the drive currents of the respective driver transistors.

The data voltage V'data can be loaded into the charging capacitor Cload before the second scan signal is provided. In other words, the data voltage V'data in the first interval P1 of the 4 be loaded into the charging capacitor Cload.

Alternatively, the data voltage V'data may be simultaneously charged to the charging capacitor Cload when the second scan signal is provided. In other words, the data voltage V'data can be charged in the second interval P2 (in the charging capacitor Cload). At the same time, the third transistor T3 can be driven and the organic light emitting element OLED can emit light. As such, the timing at which the data voltage V'data is provided is not limited to the above-described intervals.

For example, if a second scan signal of the first scan line GL1 of the organic light-emitting panel 10 is provided, each of the organic light emitting elements OLED within the respective pixel region which is connected to the first scan line GL1, emit light.

Another second scanning signal generated with a time delay of one horizontal period of a horizontal synchronous signal Hsync may be applied to the second scanning line GL2 of the organic light-emitting panel 10 to be provided. As such, all of the organic light emitting elements OLED within the respective pixel region P connected to the second scan line GL2 can emit light.

In this way, the second scanning signals of each scanning line of the organic light-emitting panel 10 be provided during the display interval.

The multiplexer 46 can each of the first scan signals of the first scan signal generator 42 and the second scan signals of the second scan signal generator 44 selectively spend. The multiplexer 46 can be controlled by a first selection signal Sel1.

For example, the first selection signal Sel1 may indicate a low-level pulse in the scanning interval corresponding to the vertical display gap. Also, the first selection signal Sel1 may have another high-level pulse at the display interval. However, the first selection signal Sel1 is not limited to this.

As in 8th shown, the data driver 50 a DAC (digital-to-analog converter) 52 , an ADC (analog-to-digital converter) 54 and a selector 54 include.

The DAC 52 can generate the data voltage V'data. For this purpose, the DAC 52 a data signal R ', G' or B 'corresponding to a digital signal is converted into the data voltage V'data of an analog signal.

The ADC 56 For example, the scan signal Sensing1 of an analog signal obtained from the pixel area P can be converted into the scan information Sensing2 of the digital signal.

The selection device 56 may be the data lines DL1 ~ DLm of the organic light-emitting panel 10 electrically either with the DAC 52 or the ADC 54 connect. The selection device 56 can be controlled by a second selection signal Sel2.

For example, the selection device 54 to the second selection signal Sel2 having a low level, and the data lines DL1 ~ DLm electrically respond to the DAC 52 connect. Likewise, the selection device 54 to the second selection signal Sel2 having a high level, and the data lines DL1 ~ DLm electrically respond to the ADC 56 connect.

The data signals R ', G' and B 'corresponding to the digital signals may be in the data voltages V'data, the analog signals through the DAC 52 in the first interval P1 the 4 correspond, be converted. Likewise, the selection device 54 respond to the second select signal Sel2 having the low level and the data lines DL1 ~ DLm electrically respond to the DAC 52 connect. The data voltages V'data can thus be obtained from the DAC 52 be provided by means of the respective data lines DL1 ~ DLm for the respective pixel area P. As a result, the data voltages V'data can be loaded into the charging capacitor Cload of the respective pixel area P.

In the third interval P3 the 4 For example, the scan information Sensing1 containing analog signals loaded in the charging capacitor Cload of the respective pixel region P can be supplied to the selection device via the respective data lines DL1 ~ DLm 54 to be provided. The selection device 54 can respond to the second select signal Sel2 having the high level and the data lines DL1 ~ DLm electrically to the ADC 56 connect. Furthermore, the scan information Sensing1 can be converted with the analog signals into the scan information Sensing2 with the digital signals. The converted scan information Sensing2 containing the digital signals can be sent to the controller 30 out 1 be supplied.

Even if not in the 7 shown, the data driver 50 further comprising a switching register, a scan circuit, first and second latches, etc., for processing the data signals R ', G' and B 'to display an image. Furthermore, the data driver 50 a buffer memory for latching the data voltages V'data corresponding to the analog signals.

As in 9 represented, the controller can 30 an offset adjuster (also referred to as offset controller) 32 , a data matcher (also referred to as a data controller) 36 and a timing controller 38 include.

The offset controller 32 can be an offset calculator 110 , an offset LUT (look-up table) 120 and an offset controller 130 , as in 10 shown include.

The offset calculator 110 can scan information Sensing2, which is in the organic light-emitting panel 10 generated and through the data driver 50 transmitted threshold voltages Vth, received. Likewise, the offset calculator 110 an offset value from the threshold voltage included in the scan information Sensing2 under control of the offset controller 32 receive.

In one embodiment, the offset calculator 110 get an offset value directly from the threshold voltage. Also, the offset calculator can 110 the obtained offset value in the offset LUT 120 to save.

In accordance with another embodiment, the offset information corresponding to a plurality of threshold voltages is in tabular form in the offset LUT 120 saved. In this case, the offset calculator 110 an offset value corresponding to the threshold voltage Vth included in the scan information Sensing2 from the offset LUT 120 using the threshold voltage Vth of the scan information Sensing2.

It is possible for the scan information Sensing1 to be present in each pixel region P within the organic light-emitting panel 100 is generated, the offset calculator 110 provided. Thus, the offset calculator 110 calculate the offset values for all pixel areas P Similarly, the calculated offset values in the offset LUT 120 be arranged or stored in such a manner that they coincide with the respective pixel areas P.

The offset value can be used to increase or decrease the data voltage for displaying an image later. Thus, the offset values corresponding to the digital signals may be used for separately increasing or decreasing the pixel data signals R ', G' and B 'such that the pixel data signals R', G 'and B' containing an image signal for the respective pixels are adjusted appropriately.

For convenience of description, the offset value may be described in an analog waveform. For example, an offset value of 0.5V or another offset value of -0.7V may be added to a data voltage of 5V.

A range of the offset value may be changed along with a design specification of a designer, but is not limited thereto.

For example, the offset LUT 120 Store offset values of a single frame (single frames).

Referring to 9 , the data controller can 36 the image signal R ', G' and B 'based on the offset from the actuator 32 adjust received offset information.

For example, the offset information of a single frame (single frames) from the offset controller 32 to the data controller 36 to be provided. Likewise, the data controller can 36 take into account the offset information of a first image signal R, G and B and output a second image signal R ', G' and B '. The second image signal R ', G' and B 'becomes the organic light-emitting panel 10 via the data driver 50 provided. Likewise, an image compensated for the threshold voltage Vth can be displayed. Thus, no unevenness of brightness is generated. As an embodiment, the offset information may be calculated or updated at each frame.

Alternatively, the offset information can be calculated or updated for all fixed frame sections (frame sections). In this case, the fixed frame portions (frame portions) may be either 5 frame portions (frame portions), 10 frame portions (frame portions), or 20 frame portions (frame portions), but are not limited thereto.

Meanwhile, the timing controller can 38 Obtain or derive timing signals from a vertical synchronous signal Vsync, a horizontal signal Hsync and an enable signal Enable. The timing signals can be used to drive the organic light-emitting panel 10 be used. Similarly, the timing signals may include SCS and DOS. SCS stands for scan control signals and DOS for data control signals.

Similarly, the timing controller 38 Output TCS and MCS using select signals A1 and A2.

The TCS can become a control signal. The TCS can be used not only to control the scan information Sensing1 obtained from each of the pixel areas P, but also to control the offset information to be calculated.

The MCS can also become a control signal. The MCS can be used not only to control the image signal R, G and B to be compensated for the offset information but also to control an image to be displayed by the compensated image signal R ', G' and B '.

When the offset information is calculated, all components within the system can be consistently controlled by the TCS. Likewise, all components within the system can be controlled by the MCS when the image is displayed.

Although it is not shown in the figures, the timing controller may 29 generate the selection signal, that of the selector 54 of the 7 provided. The timing controller 38 but is not limited to this.

In the present embodiment, the threshold voltage Vth of the pixel area P is not compensated within the pixel area P. Alternatively, in the present embodiment, the scan information Sensing1 becomes the threshold voltage Vth of the driver transistor having the pixel area P for the controller 30 provided, the offset information used to equalize the threshold voltage Vth is provided by the controller 30 is calculated and taken into account in the image signal R, G and B, and an image is reflected by the image signal in which the offset information is taken into account in the organic light-emitting panel 10 displayed. Therefore, the circuit arrangement of the pixel region P can be simplified, and moreover, the transmittance rate of the pixel region P can be maximized.

In the present embodiment, the threshold voltage of the pixel area is not compensated within the pixel area. Alternatively, in the present embodiment, the scan information of the threshold voltage of the driver transistor of the pixel region is output to the outside, i. H. for the controller, the offset information used to equalize the threshold voltage is calculated by the controller and taken into account in the image signal, and an image is converted to the organic signal by the image signal in which the offset information is taken into account light-emitting panel displayed. Therefore, the circuitry of the pixel region can be simplified, and moreover, the transmission rate of the pixel region can be maximized.

Any reference in this specification to "one embodiment", "one (1) embodiment", "exemplary embodiment", etc. means that a particular property, construction, or characteristic described with the embodiment is included in at least one embodiment Invention is included. Different occurrences of such phrases at various points in the description necessarily do not all refer to the same embodiment. Furthermore, a particular property, construction, or characteristic is described in the context of an embodiment, it is believed that it will be within the scope of those skilled in the art to accomplish such properties, construction, or characteristics in connection with other embodiments.

Although the embodiments have been described in terms of a number of embodiments only, it is to be understood that numerous other changes and embodiments may be devised by one skilled in the art that fall within the spirit and scope of the principles of the disclosure.

In particular, several variations and variations of the components and / or arrangements of the corresponding combined arrangement are possible within the scope of the disclosure, the drawings, and the appended claims. In addition to the variations and changes in the ingredients and / or Arrangements will also be apparent to those skilled in the art from alternative uses.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• KR 10-2011-0104184 [0001]

Claims (13)

Organic light-emitting display device comprising an organic light-emitting panel ( 10 ), comprising a plurality of pixel regions (P), each pixel region (P) having a scan line (GL) and a data line (DL) intersecting each pixel region (P) comprising an organic light emitting element (OLED) and a driver transistor ( T3) for driving the organic light emitting element (OLED); and a circuit configured to scan a threshold voltage (Vth) of the driver transistor (T3) in a scan interval and to control light emission of the organic light emitting element (OLED) within the pixel area (P) at a display interval. An organic light emitting display device according to claim 1, wherein the scanning interval and the display interval are contained in a single frame. An organic light emitting display device according to any one of claims 1 or 2, wherein the scanning interval corresponds to a vertical display gap of a vertical synchronous signal (Vsync). An organic light emitting display device according to claim 3, wherein the display interval corresponds to the period between two consecutive vertical display gaps. Organic light-emitting display device according to one of the preceding claims, further comprising a scan driver ( 40 ) for generating a first scan signal (S) and a plurality of second scan signals (S) and for selectively providing the first scan signal and the second scan signal (S) for the organic light-emitting panel ( 10 ). Organic light-emitting display device according to claim 5, wherein the scan driver ( 40 ) comprises: a first scan signal generator ( 42 ) for generating the first scan signal (S) within the scan interval; a second scan signal generator ( 44 ) for generating the second scan signals (S) at the display interval; and a multiplexer ( 46 ) for selectively providing the first and second scanning signal (S) for the organic light-emitting panel (FIG. 10 ). Organic light-emitting display device according to claim 6, wherein the multiplexer ( 46 ) for selectively outputting the first scan signal (S) to each frame and for selectively outputting the second scan signals ( 5 ) to the scanning line (GL) on the organic light-emitting panel (FIG. 10 ) is set during the display interval. An organic light emitting display device according to any one of the preceding claims, wherein the circuit is configured to calculate offset information based on the threshold voltage (Vth) and a second image signal (S) in consideration of the offset information of a first image signal (S) produce. An organic light emitting display device according to claim 8, further comprising a data driver ( 50 ) for determining the threshold voltage (Vth) of the organic light-emitting panel ( 10 ) and for providing data voltages (V'data) corresponding to the second image signal ( 5 ) on the organic light-emitting panel ( 10 ). Organic light-emitting display device according to claim 9, wherein the data driver ( 50 ): a DAC ( 52 ) configured to convert the second image signal (S) into data voltages (V'data) corresponding to analog signals; an ADC ( 54 ) configured to convert a first scan information (Sensing1) including the threshold voltage (Vth) corresponding to the analog signal into a second scan information (Sensing2) corresponding to the digital signal; and a selection device ( 54 ) which is arranged for switching control, to the data lines (DL) of the organic light-emitting panel ( 10 ) optionally with the DAC ( 52 ) or the ADC ( 54 ) connect to. Organic light emitting display device according to one of the preceding claims, wherein the circuit comprises: an offset adjuster ( 32 ) configured to calculate offset information based on the threshold voltage (Vth) and for storing the offset information; and a data matcher ( 36 ) which is adapted to generate a second image signal taking into account the offset information of a first display signal. Organic light emitting display device according to claim 11, wherein the offset matcher ( 32 ) an offset LUT ( 120 ) in which the offset information is stored in accordance with a plurality of threshold voltages (Vth) in a tabular form, wherein the data matcher ( 36 ) the offset information corresponding to the threshold voltage (Vth) from the offset LUT ( 120 ) receives. A method of operating an organic light-emitting display device, wherein the organic light-emitting display device comprises: an organic light-emitting panel ( 10 ) comprising a plurality of pixel areas (P), each pixel area (P) having a scan line (GL) and a data line (DL) crossing each other, each pixel area (P) further comprising an organic light emitting element (OLED) and a driver transistor (T3) for driving the organic light emitting element (OLED); the method comprising scanning a threshold voltage (Vth) of the driver transistor (T3) in a scan interval, and controlling a light emission of the organic light emitting element (OLED) within the pixel area (P) at a display interval.

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