News Column

Patent Issued for Mask Assembly and Organic Light Emitting Diode Display Manufactured Using the Same

July 16, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- Samsung Display Co., Ltd. (Giheung-Gu, Yongin, Gyeonggi-Do, KR) has been issued patent number 8766290, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventor is Lee, Sang-Shin (Yongin, KR).

This patent was filed on August 21, 2013 and was published online on July 1, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The present invention relates to a mask assembly. More particularly, the present invention relates to a mask assembly for thin film deposition, and an organic light emitting diode display manufactured using the same.

"An organic light emitting diode display has self-luminance characteristics, and exhibits high-quality characteristics such as low power consumption, high luminance, high response speed, etc. The organic light emitting diode display has a structure in which an organic emission layer is disposed between a pixel electrode and a common electrode, and each subpixel includes a pixel electrode and an organic emission layer.

"The organic emission layer is formed by a deposition method using a mask assembly. The mask assembly includes band-shaped unit masks having a plurality of deposition openings in correspondence to the organic emission layer and a frame for supporting the unit masks. The unit masks are fixed to the frame by a tensile force applied to the unit masks along a lengthwise direction, and hence are prevented from hanging down by self weight. Such a split-type mask assembly is advantageous in the manufacture of a large-sized organic light emitting diode display.

"The above information disclosed in this Background section is only for enhancement of an understanding of the background of the invention, and therefore it 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."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "The present invention provides a mask assembly which can increase the deposition quality of an organic emission layer, and an organic light emitting diode display manufactured using the same.

"An exemplary embodiment of the present invention provides a mask assembly including: a frame forming an opening; and a plurality of unit masks which form a plurality of deposition openings, both longitudinal ends of the unit masks being fixed to the frame. At least two adjacent ones of the plurality of unit masks have deposition recesses formed on both sides facing each other, and the width of the deposition recesses along the width direction of the unit masks is equal to or greater than the width of the deposition openings along the width direction of the unit masks.

"Each of the deposition openings may include long sides parallel to the width direction of the unit masks and short sides parallel to the lengthwise direction of the unit masks. The distance between the deposition openings along the width direction of the unit masks may be smaller than the distance between the deposition openings along the lengthwise direction of the unit masks.

"The deposition recesses may be positioned in parallel with the plurality of deposition openings along the width direction of the unit masks. Two deposition recesses formed in at least two unit masks may have the same shape and the same size, and may be positioned in parallel with each other along the width direction of the unit masks.

"The deposition openings and the deposition recesses may be surrounded by inclined sidewalls, and the shape of one sidewall of the deposition recesses along the width direction of the unit masks may be identical to the shape of the sidewalls of the deposition openings along the width direction of the unit masks.

"Each of the unit masks may include one surface facing a deposition surface and the opposite surface thereof, and the size of the deposition openings and deposition recesses observed on the one surface may be greater than the size of the deposition openings and deposition recesses observed on the opposite surface.

"The width w1 of the deposition recesses along the width direction of the unit masks may satisfy the following condition: w2

"where w2 indicates the width of the deposition openings along the width direction of the unit masks, and d1 indicates the distance between the deposition openings along the width direction of the unit masks.

"The plurality of deposition openings and deposition recesses may be positioned in the area corresponding to the opening of the frame.

"The unit masks may be used for the deposition of organic emission layers in correspondence to subpixels of first, second and third colors, may be fixed to the frame by the tensile force applied along the lengthwise direction, and may be disposed such that the tensile direction is orthogonal to the arrangement direction of the subpixels of the same color. The plurality of deposition openings and deposition recesses may be positioned in correspondence to the subpixels of any one of the first, second and third colors.

"An exemplary embodiment of the present invention provides an organic light emitting diode display including pixel electrodes, organic emission layers and a common electrode which are positioned on a substrate, the organic emission layers including: first organic emission layers positioned in correspondence to one subpixel; and second organic emission layers positioned across two subpixels.

"The organic emission layers may realize any one of a plurality of different colors. Organic emission layers of the same color may be positioned in a row along a first direction, and organic emission layers of different colors may be positioned alternately along a second direction orthogonal to the first direction. The second organic emission layers each may be positioned across two adjacent subpixels along the first direction.

"The length of the second organic emission layers may be more than two times the length of the first organic emission layer. The length L2 of the second organic emission layer along the first direction may be represented by the following equation: L2=2L1+d3

"where L1 indicates the length of the first organic emission layers along the first direction, and d3 indicates the distance between the first organic emission layers along the first direction.

"A thin film layer may be positioned at the center of the second organic emission layers along the second direction.

"The mask assembly according to the present exemplary embodiment allows the sidewalls of the deposition openings and the sidewalls of the deposition recesses to have a sufficient inclination. As a result, the deposition quality of the organic emission layers in the entire organic light emitting diode display can be improved."

For the URL and additional information on this patent, see: Lee, Sang-Shin. Mask Assembly and Organic Light Emitting Diode Display Manufactured Using the Same. U.S. Patent Number 8766290, filed August 21, 2013, and published online on July 1, 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=8766290.PN.&OS=PN/8766290RS=PN/8766290

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

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Electronics Newsweekly


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