CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Republic of Korea Patent Application No. 10-2019-0176135, filed on Dec. 27, 2019, which is hereby incorporated by reference in its entirety.

BACKGROUND

Field of Technology

The present Disclosure relates to an organic light emitting display (OLED) device and a driving method thereof, and more particularly, to an OLED device which is capable of reducing degradation in picture quality when driven at a low speed, and a driving method thereof.

Discussion of the Related Art

In an information dependent society, a number of techniques related to the field of a display device which displays visual information as an image or a picture have been developed. An electroluminescent display device among display devices displays a picture using a light emitting element which generates light by recombination of electrons and holes. The electroluminescent display device may be implemented as an organic light emitting display (OLED), a quantum dot display, a μ-LED display, or the like. Here, the OLED has been spotlighted as a next-generation display device in that it has a fast response speed and is capable of achieving low grayscale expression according to self-emission.

Provided that there is little input image variation in such a display device, pixels may be driven at a low speed to reduce power consumption of the display device. Although a variety of low-speed driving methods have been proposed, they may suffer a picture quality degradation problem. For example, in low-speed driving, the voltages of pixels may be discharged, thereby causing a user to feel a flicker phenomenon in which the luminances of the pixels are changed at a data update period. Therefore, there is a need for a scheme capable of solving a picture quality degradation problem in low-speed driving of a display device.

SUMMARY

Accordingly, the present disclosure is directed to an organic light emitting display (OLED) device and a driving method thereof that substantially obviate one or more problems due to limitations and disadvantages of the related art.

An object of the present disclosure is to provide an OLED device which is capable of reducing a flicker phenomenon when driven at a low speed, and a driving method thereof.

Another object of the present disclosure is to provide an OLED device which is capable of solving a power consumption degradation problem caused when a data voltage is set to a predetermined voltage for improvement in picture quality, and a driving method thereof.

Another object of the present disclosure is to provide an OLED device which is capable of improving power consumption by supplying a currently used voltage to a data line for an anode reset period in low-speed driving to set a data voltage to a predetermined voltage, and a driving method thereof.

A further object of the present disclosure is to provide an OLED device which is capable of being used for an anode reset period in low-speed driving without being limited in data range, and a driving method thereof.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with the purpose of the disclosure, as embodied and broadly described herein, an organic light emitting display device includes a display panel configured to display an image and including a plurality of pixels each including an organic light emitting diode configured to emit light with a brightness corresponding to the amount of driving current, a gate driver configured to supply a gate driving signal to each of the pixels, a data driver configured to supply a data voltage to each of the pixels, a multiplexer being switched in response to an external control signal to output any one of the data voltage and a voltage supplied from a separate power supply line, and a timing controller configured to control the multiplexer to transfer the data voltage to a data line of each of the pixels in a refresh period in a low-speed driving mode and transfer the voltage from the separate power supply line to the data line of each of the pixels for at least one anode reset period in a hold period in the low-speed driving mode.

The multiplexer may include a first switching element being switched to supply the data voltage to the data line of each of the pixels for the refresh period, and a second switching element being switched to supply the voltage from the separate power supply line to the data line of each of the pixels for the anode reset period.

The multiplexer may be disposed in the data driver or between the data driver and the display panel.

The voltage transferred to the date line of each of the pixels for the anode reset period may be a high-level voltage greater than the data voltage.

In another aspect of the present invention, a driving method of an organic light emitting display device includes determining whether to drive a display panel in a general driving mode or a low-speed driving mode, supplying a data voltage to a data line of each pixel of the display panel in a refresh period in the low-speed driving mode, and supplying a voltage from a separate power supply line to the data line of each pixel for at least one anode reset period in a hold period in the low-speed driving mode.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

