News Column

"Nano Crystal Display Device Having Patterned Microcavity Structure" in Patent Application Approval Process

August 7, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- A patent application by the inventors LEE, Hee-Keun (Suwon-si, KR); LEE, Jung Wook (Uiwang-si, KR); KIM, Yeun Tae (Suwon-si, KR); YUN, Hae Ju (Hwaseong-si, KR), filed on August 8, 2013, was made available online on July 24, 2014, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.

This patent application is assigned to Samsung Display Co., Ltd.

The following quote was obtained by the news editors from the background information supplied by the inventors: "(a) Field of the Invention

"Embodiments of the present invention relate generally to flat panel displays and their manufacture. More specifically, embodiments of the present invention relate to displays with patterned microcavity structures.

"(b) Description of the Related Art

"A liquid crystal display is one type of flat panel display devices that has found wide acceptance, and commonly includes two display panels where field generating electrodes such as pixel electrodes and a common electrode are formed, with a liquid crystal layer interposed therebetween. The liquid crystal display generates an electric field in the liquid crystal layer by applying voltages to the field generating electrodes, thus inducing specific orientations of liquid crystal molecules of the liquid crystal layer and thusly controlling the polarization of incident light, thereby displaying an image.

"Liquid crystal displays can have a NCD(Nano Crystal Display) structure that employs a sacrificial layer formed of an organic material. A supporting member is coated thereon, then the sacrificial layer is removed, and a liquid crystal is filled in the empty space formed by removal of the sacrificial layer.

"A method of manufacturing liquid crystal displays having a NCD structure also includes a process of injecting and drying an aligning agent before injecting the liquid crystal to arrange and align the liquid crystal molecules. In the process of drying the aligning agent, evaporation of the aligning agent may result in deposits of aligning agent solids such that light leakage or transmittance deterioration may be generated.

"The above information disclosed in this Background section is only for enhancement of 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."

In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "The present invention provides a liquid crystal display minimizing an agglomeration of a solid, and a manufacturing method thereof.

"In one embodiment, a display panel comprises a substrate; a pixel electrode formed on the substrate; a first black matrix and a second black matrix each disposed on the substrate; and a supporting member disposed on the substrate over the pixel electrode and the black matrix. The supporting member is shaped so as to form a microcavity between the pixel electrode and the supporting member, the microcavity having an upper surface proximate to the supporting member and a lower surface opposite to the upper surface. The microcavity has a first end positioned over the first black matrix, and a second end opposite the first end and positioned over the second black matrix. Also, the lower surface of the microcavity has first and second channels disposed therein, the first channel positioned over the first black matrix, and the second channel positioned over the second black matrix.

"The first channel can be positioned proximate to the first end, and the second channel can be positioned proximate to the second end.

"The microcavity can extend lengthwise along a major axis, and have a minor axis oriented perpendicular to the major axis. The first black matrix and the second black matrix can each be oriented parallel to the major or the minor axis.

"Widths of each of the first and second depressions can each be less than or equal to a height of the microcavity.

"The pixel electrode can be a first pixel electrode, the microcavity can be a first microcavity, and the supporting member can be a first supporting member. The first microcavity can be disposed between the first pixel electrode and the first supporting member. The display panel can further comprise: a second pixel electrode disposed on the substrate proximate to the first pixel electrode; a second supporting member disposed on the substrate over the second pixel electrode; a second microcavity disposed between the second pixel electrode and the second supporting member, the second microcavity having a top surface proximate to the second supporting member and a bottom surface opposite to the top surface; and a third black matrix and a fourth black matrix each disposed on the substrate and under the second microcavity. The second microcavity can have a one end positioned over the third black matrix, and another end opposite the one end and positioned over the fourth black matrix. The bottom surface of the second microcavity can have third and fourth channels disposed therein, the third channel positioned over the third black matrix, and the fourth channel positioned over the fourth black matrix.

"In another embodiment, a display panel can comprise a substrate; a pixel electrode disposed on the substrate; a black matrix disposed on the substrate; and a supporting member disposed on the substrate over the pixel electrode and the black matrix. The supporting member can be shaped so as to form a microcavity between the pixel electrode and the supporting member. The microcavity can have an upper surface proximate to the supporting member, a lower surface opposite to the upper surface, a first side surface extending between the upper and lower surfaces, and a second side surface opposite to the first side surface and extending between the upper and lower surfaces. At least one of the first and second side surfaces can have a plurality of depressions patterned therein.

"The plurality of depressions can comprise a repeating pattern of depressions extending along a length of its respective side surface, each depression extending from the lower surface to the upper surface.

"Each of the depressions can have an at least approximately triangular cross-sectional profile, an at least approximately U-shaped profile, an at least approximately trapezoidal cross-sectional profile, an at least approximately square cross-sectional profile, and/or an at least approximately sawtooth profile.

"The depressions can each have a pitch of approximately 3 .mu.m or less. Alternatively, the depressions can each have a pitch of approximately 1.8 .mu.m.

"Each of the depressions can be positioned over the black matrix.

"The pixel electrode can be a first pixel electrode, the microcavity can be a first microcavity, the black matrix can be a first black matrix, and the supporting member can be a first supporting member. The first microcavity can be disposed between the first pixel electrode and the first supporting member. The display panel can further comprise: a second pixel electrode disposed on the substrate proximate to the first pixel electrode; a second supporting member disposed on the substrate over the second pixel electrode; a second microcavity disposed between the second pixel electrode and the second supporting member, the second microcavity having a top surface proximate to the second supporting member, a bottom surface opposite to the top surface, a third side surface extending between the top and bottom surfaces, and a fourth side surface opposite to the third side surface and extending between the top and bottom surfaces; and a second black matrix disposed on the substrate and under the second microcavity. The third and fourth side surfaces can each have a plurality of depressions patterned therein.

"In a further embodiment, a method of manufacturing a display panel can comprise: forming a pixel electrode on a substrate; forming a black matrix on the substrate; and forming a supporting member on the substrate over the pixel electrode and the black matrix. The supporting member can be shaped so as to form a microcavity between the pixel electrode and the supporting member. The method can also include forming a feature proximate to at least one end of the microcavity, the feature positioned over the black matrix and configured to accumulate an aligning agent therein once the aligning agent is injected into the microcavity.

"The forming a black matrix can further comprise forming a first black matrix and a second black matrix on the substrate. The microcavity can have an upper surface proximate to the supporting member and a lower surface opposite to the upper surface. The microcavity can have a first end positioned over the first black matrix, and a second end opposite the first end and positioned over the second black matrix. The forming a feature can further comprise forming at least one channel in the lower surface of the microcavity, the at least one channel positioned over at least one of the first black matrix and the second black matrix.

"The forming at least one channel can further comprise forming first and second channels in the lower surface of the microcavity, the first channel positioned over the first black matrix, and the second channel positioned over the second black matrix.

"The microcavity can have an upper surface proximate to the supporting member, a lower surface opposite to the upper surface, and at least one side surface extending between the upper and lower surfaces; and the method can further comprise patterning a plurality of depressions upon the at least one side surface.

"The plurality of depressions can comprise a repeating pattern of depressions extending along a length of its respective side surface, each depression extending from the lower surface to the upper surface.

"As described, according to an exemplary embodiment of the present invention, a trench is formed at an edge of a microcavity or a shape of the edge of the microcavity is patterned to have a non-linear shaped profile. Accordingly, a solid of an aligning agent is gathered at the trench or the non-linear shape, thereby minimizing light leakage or transmittance deterioration.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a top plan view of a liquid crystal display according to an exemplary embodiment of the present invention.

"FIG. 2 is a top plan view schematically explaining an arrangement of a trench according to an exemplary embodiment of the present invention of FIG. 1.

"FIG. 3 is a cross-sectional view taken along a line III-III of FIG. 1.

"FIG. 4 is a cross-sectional view taken along a line IV-IV of FIG. 1.

"FIG. 5 is a perspective view of a microcavity according to an exemplary embodiment of the present invention.

"FIG. 6 to FIG. 12 are cross-sectional views of a manufacturing method of a liquid crystal display according to another exemplary embodiment of the present invention.

"FIG. 13 is a top plan view viewing a liquid crystal display according to an exemplary embodiment of the present invention.

"FIG. 14 is a cross-sectional view taken along the line XIV-XIV of FIG. 13.

"FIG. 15 to FIG. 21 are cross-sectional views of a manufacturing method of a liquid crystal display according to another exemplary embodiment of the present invention.

"FIG. 22 is a top plan view schematically explaining an arrangement of a trench according to an exemplary embodiment of the present invention.

"FIG. 23 is a cross-sectional view taken along the line XXIII-XXIII of FIG. 22.

"FIG. 24 is a schematic view of a non-linear part of a microcavity according to an exemplary embodiment of the present invention.

"FIG. 25 to FIG. 31 are cross-sectional views and top plane views of a manufacturing method of a liquid crystal display according to another exemplary embodiment of the present invention."

URL and more information on this patent application, see: LEE, Hee-Keun; LEE, Jung Wook; KIM, Yeun Tae; YUN, Hae Ju. Nano Crystal Display Device Having Patterned Microcavity Structure. Filed August 8, 2013 and posted July 24, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3592&p=72&f=G&l=50&d=PG01&S1=20140717.PD.&OS=PD/20140717&RS=PD/20140717

Keywords for this news article include: Samsung Display Co. Ltd.

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