KR100786846B1 - Organic light emitting display device and the detection device thereof - Google Patents

Abstract

An organic light emitting display device and a detection device thereof are provided to determine abnormality of the device by detecting a data signal. A detection device of an organic light emitting display device includes a converting unit(220) and a detecting unit(210). The converting unit converts a first signal, which is a data signal of the organic light emitting display device, to a second voltage signal. The detecting unit determines abnormality by comparing the second voltage signal with a reference range. The converting unit has a first resistor which receives the first signal at one end, and a first capacitor which is parallel connected with the first resistor.

Description

ORGANIC LIGHT EMITTING DISPLAY DEVICE AND THE DETECTION DEVICE THEREOF}

 1 is a view illustrating a connection between a detection device and an organic light emitting display device according to an exemplary embodiment of the present invention.

2 is a diagram illustrating a pixel circuit of an organic light emitting display device according to an exemplary embodiment of the present invention.

3 is a diagram illustrating an organic light emitting display device and a detection device according to a second embodiment of the present invention.

4 is a view showing a pad unit according to a second embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting display device and a driving method thereof, and more particularly to an organic light emitting display device using light emission of an organic material and a driving method thereof.

In general, an organic light emitting display device is a display device using an organic light emitting device using light emission of an organic material. An organic light emitting display device displays an image by voltage driving or current driving N ㅧ M organic light emitting cells arranged in a matrix form. The organic electroluminescent cell has a diode characteristic and is also called an organic light emitting diode (OLED), and has an anode, an organic thin film, and a cathode electrode layer.

In particular, the output state of the data current transmitted to the current driving panel of the organic light emitting display cannot be directly evaluated and measured. Since the data current output channel of the organic light emitting display device is directly connected to the display panel, it is necessary to use equipment such as a probe station when checking the operation state or observing the output phenomenon. That is, it is difficult to detect when an error occurs in the data driver and the data current is not normally generated. Therefore, it is difficult to determine whether the organic light emitting display device is out of order.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a detection device capable of determining whether an organic light emitting display device has failed.

According to an aspect of the present invention, a detection apparatus includes a converter configured to convert a first signal into a second voltage signal, and a detector configured to determine whether an abnormality is detected by comparing the second voltage signal with a reference range. And a data signal of the organic light emitting display device. The converter includes a first resistor to which the first signal is transmitted at one end, and one capacitor connected in parallel to the first resistor. The organic light emitting display device includes a plurality of detection lines connected to each of the plurality of data lines, and a pad unit connecting the plurality of detection lines and the conversion unit. The pad unit includes a plurality of switching elements, each of the plurality of switching elements being connected between the plurality of detection lines and an output terminal, and transmitting the first signal to the converter in response to a detection line selection signal.

According to another aspect of the present invention, an organic light emitting display device includes a plurality of scanning lines for transmitting a plurality of selection signals, a plurality of data lines for transmitting a data signal, a plurality of pixels connected to the scanning lines and data lines, and the data. And a pad unit electrically connected to a line to transfer a first signal corresponding to the data signal. And a plurality of detection lines connected to the pad unit and the data line, respectively. The pad unit includes a switching transistor connected between the data line and an output terminal of the pad unit, and the switching transistor is turned on in response to a detection line selection signal. The pixel circuit may include an organic light emitting diode, a first transistor for supplying a driving current to the organic light emitting diode, a second transistor for diode-connecting the first transistor in response to the selection signal, and the data in response to the selection signal. A third transistor that transmits a signal to the first electrode of the first transistor, a capacitive element connected between the gate electrode of the first transistor and the first power supply voltage, and a gate electrode and the first transistor of the third transistor The second capacitive element is connected between the gate electrode of the. The organic light emitting display device may further include a light emission control line that transmits a light emission control signal, and includes a fourth transistor configured to transfer an initialization voltage to one end of the first capacitive element in response to a selection signal immediately before the selection signal; And a fifth transistor configured to transfer the first power supply voltage to the second electrode of the first transistor in response to the emission control signal, and a sixth transistor to transfer the driving current in response to the emission control signal.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" between other elements in between. In addition, when any part "includes" any component, this means that it may further include other components, except to exclude other components unless otherwise stated.

1 is a diagram illustrating sensing a data current of an organic light emitting display device using a detection device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the organic light emitting display device 10 according to an exemplary embodiment of the present invention includes a display unit 110, a scan driver 120, a light emission controller 130, a data driver 140, and a pad unit ( 150).

The display unit 110 is connected to the scan driver 120 by a plurality of scan lines S1 -Sn, and is connected to the light emission controller 130 by a plurality of light emission control lines E1 -Ek. A plurality of selection signals are transmitted through the plurality of scan lines S1 -Sn, and a plurality of emission control signals are transmitted through the plurality of emission control lines E1 -Ek. In addition, the display unit 110 is connected to the data driver 140 through a plurality of data lines D1 -Dm, and the plurality of data signals are transmitted to the display unit 110 through the plurality of data lines D1 -Dm. .

The pad unit 150 is connected to a plurality of detection lines W1-Wm respectively connected to the plurality of data lines D1 -Dm, and detects a first signal corresponding to a plurality of data signals transmitted through the detection lines. To the device 20.

The scan driver 120, the light emission controller 130, and the data driver 140 may be electrically connected to the display 110, or may be attached to the display 110 and electrically connected to the tape carrier package, TCP. ) May be mounted in the form of a chip. Alternatively, the printed circuit board may be mounted on a flexible printed circuit (FPC) or a film that is adhered to and electrically connected to the display unit 110 in the form of a chip. Alternatively, the scan driver 120, the light emission controller 130, and the data driver 140 may be directly mounted on the glass substrate of the display 110, or may be formed of the same layers as the scan line, the data line, and the thin film transistor on the glass substrate. It may be replaced with a drive circuit which is provided or may be mounted directly.

Hereinafter, a pixel circuit of an electroluminescent display according to an exemplary embodiment of the present invention will be described with reference to FIG. 2.

2 is a diagram illustrating a pixel circuit 115 of an organic light emitting display device according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the pixel circuit of the organic light emitting diode display according to the exemplary embodiment of the present invention is formed by crossing the data line Dj and the data line Dj to which the data signal is applied, and the scan line to which the scan signal is applied. (Si, Si-1) and the emission control line Ep. The pixel circuit includes a third transistor T3 having a gate electrode electrically connected to the scan line Si, a source electrode of the third transistor T3 electrically connected to the data line Dj, and a drain electrode having a first transistor ( Is electrically connected to the drain electrode of T1). In the first transistor T1, a gate electrode is electrically connected to one end of the second capacitive element C2, and the other end of the second capacitive element C2 is connected to the gate electrode and the scan line Si of the third transistor T3. Electrically connected. The source electrode of the first transistor T1 is electrically connected to the drain electrode of the second transistor T2 and is also electrically connected to the drain electrode of the fifth transistor T5. The gate electrode of the second transistor T2 is electrically connected to the scan line. The source electrode of the fifth transistor T5 is electrically connected to the first power supply voltage VDD, and the gate electrode is electrically connected to the gate electrode of the sixth transistor T6. In addition, the sixth transistor T6 is positioned between the first transistor T1 and the anode electrode of the organic light emitting diode OLED, and the gate electrode of the sixth transistor T6 is electrically connected to the emission control line Ep. It is. The gate electrode of the first transistor T1 is electrically connected to the source electrode of the fourth transistor T4, is electrically connected to one end of the first capacitive element Cst, and the other end electrode of the first capacitive element Cst. Is electrically connected to one power supply voltage VDD. In addition, the drain electrode of the fourth transistor T4 is electrically connected to the initialization voltage Vinit line, and the gate electrode of the fourth transistor T4 is electrically connected to the previous scan line Si-1.

The first transistor T1 is a driving transistor for converting a voltage applied between the gate and the source into a current, and the second transistor T2 is a transistor for diode-connecting the first transistor T1. The third transistor T3 is a switching transistor that applies a data voltage applied to the data line to the first transistor T1 according to a selection signal applied to the scan line Si.

In addition, the fourth transistor T4 is a switching transistor that applies an initialization voltage applied to the initialization line to the first capacitive element Cst, and the fifth transistor T5 applies the first power supply voltage to the first transistor T1. The switching transistor is applied to the source electrode.

In addition, the sixth transistor T6 is a switching transistor for selectively blocking current output from the first transistor T1 to the organic light emitting diode OLED according to the emission control signal applied to the emission control line Ep.

In addition, the second capacitive element C2 is a capacitor that stores the threshold voltage of the first transistor T1 and compensates for the deviation according to the threshold voltage of the first transistor T1. The first capacitive element Cst serves to prevent a drop in the data voltage applied between the gate electrode and the source electrode of the first transistor T1.

Hereinafter, the detection apparatus 20 according to the embodiment of the present invention will be described.

The detection device 20 includes a detector 210 and a converter 220. The detector 210 is connected to any one of the plurality of detection lines W1-Wm of the pad unit 150 to receive the first signal. The detection device 20 according to the first embodiment of the present invention is connected to the plurality of detection lines W1-Wm one by one in order to receive each of the plurality of first signals.

The converter 220 has a resistor R and a capacitor C connected in parallel, and the first signal corresponding to the data signal is connected to a node A where one end of the resistor R and one end of the capacitor C meet each other. When transferred, the signal is converted into a voltage signal Wd and transferred to the detector. At this time, the capacitor stores the voltage signal Wd such that the voltage signal Wd is maintained at a constant level in response to the first signal. The other end of the resistor R and the capacitor C is connected to the voltage source VCC. The voltage source VCC may be a ground voltage level.

The detector 210 receives the voltage signal Wd and detects an output waveform of the first signal to detect a first signal outside the reference range. The reference range is a first signal range corresponding to a data signal normally generated by the data driver 140 and is preset. When the first signal outside the reference range is detected, the detector 210 determines that there is an error in the data signal corresponding to the detected first signal.

1 is connected to one of the detection lines (W1-Wm) through the detection device 20 and the pad unit 150 to detect a first signal corresponding to the data signal according to the first embodiment of the present invention. It is shown as determining whether the signal is abnormal. However, the present invention is not limited to this.

Hereinafter, the organic light emitting display device 10 and the detection device 20 according to the second embodiment of the present invention will be described.

3 is a diagram illustrating an organic light emitting display device 10 and a detection device 20 according to a second embodiment of the present invention.

As shown in FIG. 3, the pad unit 150 ′ receives the detection line selection signal DCS from the outside and selects one of the plurality of detection lines W1-Wm according to the detection line selection signal DCS. do.

Specifically, the data signal Di of the data line corresponding to the detection line Wi selected by the detection line selection signal DCS among the plurality of data signals output from the data driver 140 is selected. Then, the first signal corresponding to the data signal Di is transmitted to the detection device 20 connected to the pad unit 150 ′.

Hereinafter, the other components shown in FIG. 3 are the same as in the first embodiment.

4 is a diagram illustrating a pad part 150 ′ according to the second embodiment of the present invention.

As shown in FIG. 4, the pad unit 150 ′ includes a selector 151 and a plurality of switching transistors T1 -Tm, and each of the plurality of switching transistors T1 -Tm includes a detection line W1. -Wm) and output terminal (OUT) are connected. The selector 151 transfers the turn-on signal to one of the plurality of switching transistors according to the detection line selection signal. In this case, the detection line selection signal DCS may be a clock signal having a constant period and alternately having a high level and a low level, and the selector 151 is synchronized with a rising edge timing of the clock signal. The switching transistor turn-on signal may be sequentially transmitted to the plurality of switching transistors. Then, each of the first signals corresponding to the plurality of data signals is sequentially transmitted to the detection apparatus. The detection apparatus 20 may determine whether the data signal is abnormal by using a voltage signal corresponding to the first signal and store the abnormality. The switching transistor according to the second embodiment of the present invention is a p-channel type transistor, and the switching transistor turn-on signal is a voltage signal of a sufficiently low level. However, the present invention is not limited thereto, and other channel type transistors may be used. Accordingly, the voltage level of the switching transistor turn-on signal may also vary.

As described above, the detection apparatus according to the embodiment of the present invention can easily determine whether the data signal is abnormal.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

According to the present invention, there is provided a detection device capable of determining whether an organic light emitting display device is abnormal by detecting a data signal by a simple method.

In addition, since the detection apparatus according to the present invention is not mounted when mass-producing the organic light emitting display device, the module price increase due to component consumption does not occur.

Claims (9)

A converter converting the first signal into a second voltage signal, Comprising a detection unit for determining whether or not abnormality by comparing the second voltage signal with a reference range, The first signal is, A detection device corresponding to the data signal of the organic light emitting display device connected to the detection device. The method of claim 1, The conversion unit, A first resistor through which the first signal is transmitted; 1 capacitor connected in parallel with the first resistor Detection apparatus comprising a. The method of claim 2, The organic electroluminescent display device, A plurality of detection lines connected to each of the plurality of data lines, A pad unit connecting the plurality of detection lines and the conversion unit Detection apparatus comprising a. The method of claim 3, The pad unit, It includes a plurality of switching elements, And each of the plurality of switching elements is connected between the plurality of detection lines and the output terminal, and transmits the first signal to the converter in response to a detection line selection signal. A plurality of scan lines for transmitting a plurality of selection signals, A plurality of data lines carrying data signals, A plurality of pixels connected to the scanning line and the data line, and A pad part electrically connected to the data line to transfer a first signal corresponding to the data signal Organic light emitting display device comprising a. The method of claim 5, And a plurality of detection lines connected to the pad part and the data line, respectively. The method of claim 6, The pad unit, A switching transistor connected between the data line and an output terminal of the pad unit; And the switching transistor is turned on in response to a detection line selection signal. The method of claim 7, wherein The circuit of each of the plurality of pixels, Organic light emitting device, A first transistor for supplying a driving current to the organic light emitting device, A second transistor for diode-connecting the first transistor in response to the selection signal; A third transistor configured to transfer the data signal to a first electrode of the first transistor in response to the selection signal; A capacitive element connected between the gate electrode of the first transistor and a first power supply voltage, and And a second capacitive element connected between the gate electrode of the third transistor and the gate electrode of the first transistor. The method of claim 8, The circuit of each of the plurality of pixels, Further comprising a light emission control line for transmitting a light emission control signal, A fourth transistor transferring an initialization voltage to one end of the first capacitive element in response to a selection signal immediately before the selection signal; A fifth transistor configured to transfer the first power supply voltage to a second electrode of the first transistor in response to the emission control signal; And a sixth transistor configured to transfer the driving current in response to the emission control signal.

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