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Patent Issued for Organic Light-Emitting Display Device and Driving Method

August 20, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Yoo, Gi-Na (Yongin, KR); Jeong, Seung-Jae (Yongin, KR); Kim, Min-Jae (Yongin, KR), filed on September 22, 2010, was published online on August 5, 2014.

The patent's assignee for patent number 8797368 is Samsung Display Co., Ltd. (Yongin-si, KR).

News editors obtained the following quote from the background information supplied by the inventors: "The following description relates to an organic light-emitting diode (OLED) display device and a driving method thereof, and more particularly, to an OLED display device capable of reflecting a saturation of a source image to change the brightness of the source image in order to reduce or minimize power consumption within a range in which lowering of an image quality perceived by a user is reduced or minimized, and a driving method thereof.

"Flat panel display (FPD) devices such as liquid crystal display (LCD) devices, plasma display panel (PDP) devices, field emission display (FED) devices, or the like have been developed to overcome the disadvantages of cathode ray-tube (CRT) display devices. Among these display devices, an organic light-emitting diode (OLED) display device, which has high luminous efficiency, high luminance, wide viewing angles, and fast response times, has attracted attention as a next generation display device.

"The OLED display device displays an image using an organic light-emitting diode (OLED) which generates light through a recombination of electrons and holes. The OLED display device has fast response times and is driven with low power consumption."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Aspects of embodiments of the present invention are directed toward an organic light-emitting diode (OLED) display device capable of improving an image quality and reducing power consumption using an auto current limit (ACL) algorithm for changing the brightness of an image within a range in which lowering of the image quality perceived by a user is reduced or minimized, and a driving method thereof.

"According to an embodiment of the present invention, there is provided an organic light-emitting diode (OLED) display device including: an image analyzer for obtaining an emission ratio and a saturation of an input source image, the emission ratio indicating light-emitted degrees of pixels constituting the input source image; an emission ratio adjuster for adjusting the emission ratio according to the saturation; a brightness adjuster for adjusting the brightness of the input source image according to the adjusted emission ratio; a data driver for establishing a data voltage of a data signal corresponding to the input source image based on the adjusted original brightness; and a pixel unit including an organic light-emitting diode (OLED), the pixel unit being configured to establish a driving current according to the data voltage and to receive a scan signal, an emission control signal, and the data signal in order to allow the OLED to emit light.

"In one embodiment, the emission ratio is an average of values for indicating the light-emitted degrees of the pixels constituting the input source image.

"In one embodiment, the saturation of the source image is an average of saturation values of the pixels constituting the input source image.

"In one embodiment, if the saturation of the input source image is higher than a reference value set in consideration of the Helmholtz-Kohlrausch (H-K) effect, the emission ratio adjuster is configured to increase the emission ratio.

"In one embodiment, the brightness adjuster is configured to decrease the brightness of the input source image by a brightness reduction ratio proportional to the emission ratio of the input source image.

"In one embodiment, if the emission ratio of the input source image is lower than the reference value, the brightness adjuster is configured not to change the brightness of the input source image.

"According to an embodiment of the present invention, there is provided a method of driving an OLED display device, The method includes: obtaining an emission ratio and a saturation of an input source image, the emission ratio indicating light-emitted degrees of pixels constituting the input source image; adjusting the emission ratio according to the saturation; adjusting the brightness of the input source image according to the adjusted emission ratio; establishing a data voltage of a data signal corresponding to the input source image based on the adjusted brightness; and displaying an image corresponding to a scan signal, an emission control signal, and the data voltage.

"In one embodiment, the emission ratio is an average of values for indicating the light-emitted degrees of the pixels constituting the input source image.

"In one embodiment, the saturation of the source image is an average of saturation values of the pixels constituting the input source image.

"In one embodiment, the adjusting of the emission ratio includes: increasing the emission ratio if the saturation of the input source image is higher than a reference value set in consideration of the Helmholtz-Kohlrausch (H-K) effect.

"In one embodiment, the adjusting of the brightness includes: decreasing the brightness of the input source image by a brightness reduction ratio proportional to the emission ratio of the input source image.

"In one embodiment, the adjusting of the brightness includes: maintaining the brightness of the input source image if the emission ratio of the input source image is lower than the reference value."

For additional information on this patent, see: Yoo, Gi-Na; Jeong, Seung-Jae; Kim, Min-Jae. Organic Light-Emitting Display Device and Driving Method. U.S. Patent Number 8797368, filed September 22, 2010, and published online on August 5, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8797368.PN.&OS=PN/8797368RS=PN/8797368

Keywords for this news article include: Electronics, Light-emitting Diode, Samsung Display Co. Ltd.

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Source: Electronics Newsweekly


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