The assignee for this patent, patent number 8508442, is
Reporters obtained the following quote from the background information supplied by the inventors: "The disclosed technology relates to an organic light emitting display device, and more particularly, to an organic light emitting display device with automatic current limit driving and a driving method thereof.
"Various flat panel display devices with reduced weight and volume as compared to cathode ray tube devices have been developed and commercialized. Examples of flat panel displays used in current products include liquid crystal displays, field emission displays, plasma display panels, organic light emitting diode (OLED) displays, etc.
"An organic light emitting device displays an image by using organic light emitting diodes that emit light by recombining holes with electrons.
"Organic light emitting displays are used in PDAs, MP3 players, DSCs, cell phones, etc. The market for OLED displays is expanding remarkably due to advantages such as excellent color reproducibility and thinness.
"However, because an OLED display emits light dependent on an amount of current, it tends to consume a large amount of current when emitting bright light. Such a display should preferably have lower power consumption so that it can be used in mobile device where power from a battery is at a premium.
"In order to reduce power consumption, automatic current limit (ACL) driving technology can be used. ACL reduces consumption of current by controlling the amount of current consumed in a display panel and implements a dynamic contrast.
"ACL driving has advantages of dynamic contrast and reduction of power consumption, while its disadvantage is the generation of flicker."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventor's summary information for this patent: "One inventive aspect is an organic light emitting display device, which has a pixel unit including a plurality of pixels connected with scan lines and data lines. The display device also includes a timing controller configured to supply frames of first data, and a converter configured to receive the frames of first data. The converter includes a color coordinate converter configured to determine luminance components of the first data, a peak brightness ratio (PBR) generator, configured to determine a PBR for the first data of each frame, and a data converter configured to generate second data for each frame based on the first data for each frame and on a PBR. The display device also includes a data driver configured to receive the second data from the converter and to provide the second data to the data lines.
"Another inventive aspect is a method of driving an organic light emitting display device. The method includes converting color coordinates of first data of a plurality of frames, extracting luminance information of the converted first data of successive frames, and comparing and analyzing histogram data of the luminance information of the first data of the successive frames. The method also includes detecting whether the number of maximum and minimum gray-scales in the luminance information for a current frame is different from the number of maximum and minimum gray-scales in the luminance information of a previous frame, and based on a difference in the number of maximum and minimum gray-scales in the current and previous frames, determining whether flicker in the current frame is anticipated. The method also includes converting the first data of each frame to second data for each frame by applying a peak brightness ratio (PBR) value to the first data of each frame, where if flicker is anticipated the peak brightness ratio value is equal to a peak brightness ratio value applied to the previous video frame.
"Another inventive aspect is an organic light emitting display device. The display device has a pixel unit including a plurality of pixels, and a converter configured to receive frames of first data. The converter includes a peak brightness ratio (PBR) generator configured to determine a PBR for the first data of each frame, and a data converter configured to generate second data for each frame based on the first data for each frame and on a selected one of the generated PBRs. The display device also includes a data driver configured to provide the second data to the data lines."
For more information, see this patent: Yoo, Young-Wook. Organic Light Emitting Display Device and Driving Method. U.S. Patent Number 8508442, filed
Keywords for this news article include: Technology,
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