Source: http://www.google.com/patents/US7773173?dq=6,064,942
Timestamp: 2014-07-25 04:29:16
Document Index: 291122291

Matched Legal Cases: ['art 1', 'art 32', 'art 1', 'arts 32', 'arts 1', 'art 1', 'arts 1', 'Application No. 2007101437275']

Patent US7773173 - Reflection plate and liquid crystal display device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsIt is to suppress the interference of the reflected light easily and securely even in a highly fine liquid crystal display device. The reflection plate comprises recessed or protruded parts and a reflection film formed over the recessed or protruded parts. A unit shape of the recessed or protruded parts...http://www.google.com/patents/US7773173?utm_source=gb-gplus-sharePatent US7773173 - Reflection plate and liquid crystal display deviceAdvanced Patent SearchPublication numberUS7773173 B2Publication typeGrantApplication numberUS 11/878,205Publication dateAug 10, 2010Filing dateJul 23, 2007Priority dateAug 2, 2006Fee statusPaidAlso published asCN101118295A, US8094285, US20080170180, US20100248157Publication number11878205, 878205, US 7773173 B2, US 7773173B2, US-B2-7773173, US7773173 B2, US7773173B2InventorsAkio Kobayashi, Yasuki Kudo, Kenichirou NakaOriginal AssigneeNec Lcd Technologies, Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (13), Non-Patent Citations (1), Referenced by (1), Classifications (5), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetReflection plate and liquid crystal display deviceUS 7773173 B2Abstract It is to suppress the interference of the reflected light easily and securely even in a highly fine liquid crystal display device. The reflection plate comprises recessed or protruded parts and a reflection film formed over the recessed or protruded parts. A unit shape of the recessed or protruded parts is a polygon, an arbitrary point other than a centroid of the polygon that constitutes the recessed or protrude part is placed at a position that meets with an orderly-mannered lattice point as an origin, and each of the unit-shape polygons is arranged at a position that is rotated randomly with respect to the origin.
1. A reflection plate, including recessed or protruded parts and a reflection film formed over the recessed or protruded parts: wherein
a unit shape of the recessed or protruded parts is a polygon;
an arbitrary point other than a centroid of the polygon that constitutes the recessed or protrude part is placed at a position that meets with an orderly-mannered lattice point as an origin; and
each of the unit-shape polygons is arranged at a position that is rotated randomly with respect to the origin.
2. The reflection plate as claimed in claim 1, wherein the orderly-mannered lattice is a closest-packed lattice or a tetragonal lattice.
3. The reflection plate as claimed in claim 1, wherein the polygon is a square.
4. The reflection plate as claimed in claim 1, wherein a size of one side of the polygon is in a range of about 3-20 μm.
5. The reflection plate as claimed in claim 1, wherein a ratio of Dpi/Dsi is about 1.5-2.5, where Dsi is a size of one side of the polygon and Dpi is a distance between the lattice points of the orderly-mannered lattice.
6. The reflection plate as claimed in claim 1, wherein an absolute value of a rotation angle of the unit shape is about 5 degrees or more.
7. The reflection plate as claimed in claim 1, wherein, it is desirable for a ratio of Dpi/Dsi to be about 1.8-2.2, where Dsi is a size of one side of the polygon and Dpi is a distance between the lattice points of the orderly-mannered lattice.
8. The reflection plate as claimed in claim 1, wherein, it is desirable for an absolute value of a rotation angle of the unit shape to be within a range of about 15-20 degrees.
9. The reflection plate as claimed in claim 1, wherein the unit shape includes polygons of a same shape.
10. The reflection plate as claimed in claim 1, wherein the unit shape includes polygons of two or more kinds of sizes or polygons of two or more kinds of shapes.
11. The reflection plate as claimed in claim 1, wherein the neighboring unit shapes are not in contact with each other.
12. The reflection plate as claimed in claim 1, wherein a part of the polygons is eliminated randomly.
13. The reflection plate as claimed in claim 1, wherein the recessed or protruded part is in a substantially circular shape.
14. The reflection plate as claimed in claim 1, wherein the reflection plate reflects light.
15. The reflection plate as claimed in claim 1, wherein the reflection plate includes a photosensitive organic film and a reflection film.
16. The reflection plate as claimed in claim 15, wherein the photosensitive organic film has a translucent characteristic.
17. The reflection plate as claimed in claim 15, wherein the photosensitive organic film is a novolac resin or an acryl resin.
18. The reflection plate as claimed in claim 1, wherein the recessed or protruded parts are formed by performing at least exposure and development in this order.
19. The reflection plate as claimed in claim 1, wherein the recessed or protruded parts are formed into a substantially circular shape by overexposure.
20. A reflection plate including an uneven pattern, wherein, on conditions that: a unit shape is a closed figure formed by straight lines connecting between centers of lines that connect middle points of neighboring recessed parts or neighboring protruded parts, the closed figure surrounding the middle points; and there is assumed on the reflection plate an arbitrary orderly-mannered lattice including a lattice interval that is almost equal to an average value of the lines connecting between the middle points of the neighboring recessed parts or the neighboring protruded parts, there is a single lattice point of the orderly-mannered lattice within the unit shape.
21. A liquid crystal display device, including the reflection plate of claim 1. Description
(1) An orderly-mannered lattice 46 is assumed to be on a photomask, an arbitrary point (the point corresponding to the single point (43, 43 a, 43 b) of the recessed or protruded part 1) other than the centroid of a light-shielding part 32 (which corresponds to the unit-shape polygon (42, 42 a, 50) that constitutes the recessed or protruded part 1) is arranged on each lattice point 45.
(2) All the polygonal light-shielding parts 32 arranged on the lattice point 45 are moved by an arbitrary amount.
Therefore, when the reflection plate according to the exemplary embodiment of the present invention is formed by using the above-described photomask, it is formed in the following structure. That is, the unit shape of the recessed or protruded parts 1 is a polygon, and an arbitrary point (43, 43 a, 43 b) thereof other than the centroid of the polygon (42, 42 a, 50) which constitutes the recessed or protruded part 1 is placed at the position that meets with the position of an orderly-mannered lattice point 45 as the origin, and each unit-shape polygon (42, 42 a, 50) is arranged at a position that is rotated randomly with respect to the respective origin (43, 43 a, 43 b).
As shown in FIG. 1, the transflective liquid crystal display device including a transmission area and a reflection area includes : a substrate (referred to as a TFT substrate 10) that comprises an uneven-patterned reflection plate formed in the reflection area; another substrate (referred to as a counter substrate 60) that opposes to the TFT substrate 10; a liquid crystal 70 injected between both substrates; an optical member (not shown) arranged on the outer side of the both substrates; a backlight unit (not shown) arranged on the back side of the TFT substrate 10; and the like.
By referring to FIG. 6B, there is described the details of designing the photomask that is used in the second example for fabricating the reflection plate including an uneven pattern. As shown in FIG. 6B, light-shielding parts (32) for forming the recessed or protruded parts 1 of the reflection plate 3 shown in FIG. 6A are provided on a photomask 41 a, and the light-shielding parts (32) are disposed as squares 42 a on the photomask 41 a. The size of one side of the square 42 a is about 7 μm, and each square 42 a is arranged in such a manner that a vertex 43 a of the square 42 a meets with the lattice point of the closest-packed lattice 44 a. Further, each of the squares 42 is rotated by random angles with respect to the vertex 43 a of the square 42 a as the origin.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS6313895Oct 23, 1997Nov 6, 2001Sharp Kabushiki KaishaReflecting plate, reflection type liquid crystal display device and processes for manufacturing sameUS6665030 *Dec 21, 2001Dec 16, 2003Kabushiki Kaisha ToshibaLiquid crystal display device with projection-recess patterns formed in pixel regions for reflecting incident lightUS7612847Sep 5, 2002Nov 3, 2009Nec Lcd Technologies, Ltd.Generation of pattern data with no overlapping or excessive distance between adjacent patternsUS20020113926 *Dec 21, 2001Aug 22, 2002Yasuyuki HanazawaLiquid crystal display deviceUS20040239844Sep 5, 2002Dec 2, 2004Hiroshi KanohGeneration of pattern data free from any overlapping or excessive separation of dot patterns adjacent to each otherUS20080170180 *Jul 23, 2007Jul 17, 2008Nec Lcd Technologies, Ltd.Reflection plate and liquid crystal display deviceCN1188248AOct 23, 1997Jul 22, 1998夏普公司Reflecting plate, reflection type liquid crystal display device and processes for manufacturing sameCN1554029ASep 5, 2002Dec 8, 2004日本电气株式会社Generation of pattern data free from any overlapping or excessive separation of dot patterns adjacent to each otherJP2002014211A Title not availableJPH04243226A Title not availableJPH08184846A Title not availableJPH11337964A Title not availableJPS58125084A Title not available* Cited by examinerNon-Patent CitationsReference1Chinese Patent Office issued a Chinese Office Action dated Oct. 16, 2009, Application No. 2007101437275.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8094285 *Jun 9, 2010Jan 10, 2012Nec Lcd Technologies, Ltd.Method for manufacturing a reflection plate* Cited by examinerClassifications U.S. Classification349/67, 349/113International ClassificationG02F1/1335Cooperative ClassificationG02F1/133553European ClassificationG02F1/1335RLegal EventsDateCodeEventDescriptionJan 15, 2014FPAYFee paymentYear of fee payment: 4Nov 8, 2011ASAssignmentFree format text: CHANGE OF NAME;ASSIGNOR:NEC LCD TECHNOLOGIES, LTD.;REEL/FRAME:027189/0704Effective date: 20110701Owner name: NLT TECHNOLOGIES, LTD., JAPANJul 23, 2007ASAssignmentOwner name: NEC LCD TECHNOLOGIES, LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOBAYASHI, AKIO;KUDO, YASUKI;NAKA, KENICHIROU;REEL/FRAME:019601/0541Effective date: 20070614RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google