The patent's assignee for patent number 8525404 is
News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to an organic light emitting diode (OLED) display. More particularly, it relates to an OLED display having improved visibility.
"An OLED display includes a plurality of organic light emitting diodes (OLEDs) including hole injection electrodes, an organic light emission layer, and electron injection electrodes. Light is emitted by energy generated when excitons, generated when electrons and holes are combined, drop from an excited state to a ground state, and the OLED display displays an image by using the light.
"Accordingly, an OLED display has self-luminance characteristics, and unlike a liquid crystal display (LCD), the OLED display's thickness and weight thereof can be reduced since a separate light source is not required. Further, because OLED displays have high quality characteristics, such as low power consumption, high luminance, and high reaction speeds, OLED displays are appropriate for use in mobile electronic devices.
"In general, the hole injection electrode, the electron injection electrode, and other metal wires of the OLED display may reflect external light. When the OLED display is used in a bright place, expression of black color and contrast are deteriorated due to reflection of external light, thereby deteriorating visibility of the OLED display.
"The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention, and therefore may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "The present invention provides an organic light emitting diode (OLED) display having improved visibility.
"An exemplary OLED display according to an embodiment of the present invention includes a plurality of pixels, each of the plurality of pixels including: a thin film transistor (TFT) including a gate electrode, a source electrode, and a drain electrode; a planarization layer on the TFT and including a contact hole at least partially exposing the drain electrode; a pixel electrode on the planarization layer and coupled to the drain electrode of the TFT through the contact hole; a pixel defining layer on the planarization layer and having an opening that exposes the pixel electrode; an organic emission layer on the pixel electrode; and a common electrode on the organic emission layer and the pixel defining layer, and the pixel defining layer includes a corner-cube pattern facing the common electrode.
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