Source: http://www.google.com/patents/US20100002168?dq=5708422
Timestamp: 2014-04-16 23:14:49
Document Index: 521643526

Matched Legal Cases: ['application No. 2006', 'art 22', 'art 18', 'art 18', 'art 18', 'art 18']

Patent US20100002168 - Liquid crystal display apparatus and method for grounding liquid crystal ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsDisclosed is a liquid crystal display apparatus, including: a liquid crystal display panel; a polarizing plate which is processed to be conductive and is attached to a surface of the liquid crystal display panel; and a conductive frame, wherein the polarizing plate includes a projecting area which projects...http://www.google.com/patents/US20100002168?utm_source=gb-gplus-sharePatent US20100002168 - Liquid crystal display apparatus and method for grounding liquid crystal display apparatusAdvanced Patent SearchPublication numberUS20100002168 A1Publication typeApplicationApplication numberUS 12/585,279Publication dateJan 7, 2010Filing dateSep 10, 2009Priority dateSep 27, 2006Also published asCN101153988A, CN101153988B, US7907231, US8259250, US20080074577Publication number12585279, 585279, US 2010/0002168 A1, US 2010/002168 A1, US 20100002168 A1, US 20100002168A1, US 2010002168 A1, US 2010002168A1, US-A1-20100002168, US-A1-2010002168, US2010/0002168A1, US2010/002168A1, US20100002168 A1, US20100002168A1, US2010002168 A1, US2010002168A1InventorsAkihide SatoOriginal AssigneeNec Lcd Technologies, Ltd.Export CitationBiBTeX, EndNote, RefManReferenced by (2), Classifications (9), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetLiquid crystal display apparatus and method for grounding liquid crystal display apparatusUS 20100002168 A1Abstract Disclosed is a liquid crystal display apparatus, including: a liquid crystal display panel; a polarizing plate which is processed to be conductive and is attached to a surface of the liquid crystal display panel; and a conductive frame, wherein the polarizing plate includes a projecting area which projects outward from the edge of the liquid crystal display panel, and wherein the conductive frame presses the projecting area of the polarizing plate in order to ground the polarizing plate. A method for grounding a liquid crystal display apparatus is also disclosed.
a liquid crystal display panel; a polarizing plate which is processed to be conductive and is attached to a surface of the liquid crystal display panel; and a conductive frame, wherein the polarizing plate includes a projecting area which projects outward from the edge of the liquid crystal display panel, and wherein the conductive frame presses the projecting area of the polarizing plate in order to ground the polarizing plate. 2. The liquid crystal display apparatus according to claim 1, wherein the conductive frame includes an elastic contact part, which touches the polarizing plate in order to ground the polarizing plate.
3. A method for grounding a liquid crystal display apparatus including a liquid crystal display panel, a polarizing plate which is processed to be conductive, and a conductive frame, the method comprising:
attaching the polarizing plate to a surface of the liquid crystal display panel so that the polarizing plate includes a projecting area which projects outward from the edge of the liquid crystal display panel; and grounding the polarizing plate through the conductive frame which presses a surface of the projecting area of the polarizing plate. 4. The method for grounding the liquid crystal display apparatus according to claim 3, wherein the conductive frame includes an elastic part, which touches the polarizing plate in order to ground the polarizing plate. Description
The present Application is a Divisional Application of U.S. patent application Ser. No. 11/902,912, filed on Sep. 26, 2007.
RELATED APPLICATIONS This application is based upon and claims the benefit of priority from Japanese patent application No. 2006-262221, filed on Sep. 27, 2006, the disclosure of which is incorporated herein in its entirety by reference.
The liquid crystal display apparatus shown in FIG. 3 includes a liquid crystal material 11, an upper polarizing plate 13 b, a conductor 16 a, a metallic frame 180, a lower polarizing plate 15 a, a backlight unit 19 and a printed wiring board 21. The conductor 16 a includes, for example, a conductive rubber and forms electrical connection between the upper polarizing plate 13 b and the metallic frame 180.
As shown in FIG. 4, the upper polarizing plate 13 b includes a three-layered structure having an optical polarizing layer 131, a conductive layer 132 and an antireflection layer 133. Both-sided adhesive tapes formed on both sides of the conductor 16 a bond the upper polarizing plate 13 b and the conductor 16 a and bond the metallic frame 180 and the conductor 16 a. The conductive layer 132 is, for example, an ITO (Indium Tin Oxide) film formed with the sputtering method. A film made of SiO2 is formed as the antireflection layer 133 on the surface of the conductive layer 132 for protection thereof.
An opposite substrate 12 and an opposite substrate side polarizing plate 13 a shown in FIG. 5 correspond to the upper polarizing plate 13 b shown in FIG. 3. A liquid crystal driving circuit substrate 14 and a liquid crystal driving circuit side polarizing plate 15 b shown in FIG. 5 correspond to the lower polarizing plate 15 a shown in FIG. 3. The liquid crystal display panel has a structure that the liquid crystal driving circuit substrate 14 and the opposite substrate 12 are oppositely arranged with a predetermined gap and are sealed by a sealing member 17. The liquid crystal material 11 is disposed in the gap therebetween. The polarizing plate 13 a at the opposite substrate side is adhered to a front surface (i.e. a display surface side) of the liquid crystal display panel. The polarizing plate 15 a at the liquid crystal driving circuit side is adhered to a rear surface of the liquid crystal display panel.
According to the structure shown in FIG. 5, when the metallic frame 180 presses the conductor 16 a against the polarizing plate 13 a at the opposite substrate side arranged on the surface of the liquid crystal display panel, an electrical grounding is secured. However, stress is applied to the liquid crystal display panel, and consequently, an uneven image on a screen due to the stress is generated. If the stress is made so small that the uneven images do not occur, the electric resistance between the polarizing plate 13 a at the surface of the opposite substrate side and the metallic frame 180 via the conductor 16 a becomes large. As a result, the electric charge can not be discharged sufficiently.
FIG. 6 is a fragmentary cross sectional view showing other liquid crystal display apparatus disclosed in Japanese Patent Application Laid-Open No. 2004-355035. According to the disclosed structure, the metallic frame 180 and the polarizing plate 13 a at the opposite substrate side are connected electrically each other through a conductive tape 20, instead of the conductor 16 a. In this case, since the conductive tape 20 is adhered to the surface of the polarizing plate 13 a at the opposite substrate side, the electric charge can be discharged to the metallic frame 180 without the stress originated with the metallic frame 180 which is applied to the surface of the liquid crystal display panel. However, according to the structure, when the liquid crystal display panel and the backlight unit 19 are installed in the metallic frame 180, it becomes necessary to perform a step for adhering the conductive tape 20 which is an extra process. As a result, production cost of the liquid crystal display apparatus increases due to the additive step in the assembly process of the apparatus.
FIG. 7 is a fragmentary cross sectional view showing further other liquid crystal display apparatus disclosed in Japanese Patent Application Laid-Open No. 2004-355035. According to the apparatus, a conductive tape 20 a is used. Here, the conductive tape 20 a is adhered to a metal part 22 of the backlight unit 19 instead of the metallic frame 180. Accordingly, the apparatus includes the same difficulty as the apparatus shown in FIG. 6.
SUMMARY OF THE INVENTION The present invention has been proposed in view of the above mentioned circumstances. The object of the present invention is to provide a liquid crystal display apparatus in which a stress is not applied to a liquid crystal display panel and an uneven image does not occur, even if a strong contact is made on a surface of a polarizing plate for connection to the ground, and to provide a method for grounding the liquid crystal display apparatus.
Further, the present invention provides a method for grounding a liquid crystal display apparatus including a liquid crystal display panel, a polarizing plate which is processed to be conductive, and a conductive frame, the method including: attaching the polarizing plate to a surface of the liquid crystal display panel so that the polarizing plate includes a projecting area which projects outward from the edge of the liquid crystal display panel; and grounding the polarizing plate through the conductive frame which presses a surface of the projecting area of the polarizing plate.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS Exemplary embodiments of the present invention will now be described in detail in accordance with the accompanying drawings.
First Exemplary Embodiment FIG. 1 is a cross sectional view of a part of a liquid crystal display apparatus according to a first exemplary embodiment of the present invention. As shown in FIG. 1, the liquid crystal display apparatus according to the embodiment includes a liquid crystal material 11, an opposite substrate 12, a polarizing plate 13 at an opposite substrate side, a liquid crystal driving circuit substrate 14, a polarizing plate 15 at a liquid crystal driving circuit side, a conductor 16, a sealing member 17, a metallic frame 18 and a backlight unit 19.
Second Exemplary Embodiment Next, a second exemplary embodiment of the present invention will be described with reference to drawings. FIG. 2 is a cross sectional view of a part of a liquid crystal display apparatus according to the second exemplary embodiment of the present invention. The conductor 16 shown in FIG. 1 is not used in FIG. 2. In FIG. 2, a metallic frame 18 a includes an elastic contact part 18 b which is formed to be convex toward the projecting area of the polarizing plate 13 through processing the metallic frame 18 a. The contact part 18 b touches and presses the projecting area of the polarizing plate 13 to make electric contact therewith. The contact part 18 b of the metallic frame 18 a can be processed with various methods such as bending work and press work.
Electric connection between the metallic frame 18 a and the polarizing plate 13 can be formed by strong contact between the contact part 18 b and the projecting area of the polarizing plate 13. Moreover, uneven image on a screen due to stress applied to the liquid crystal display panel is not generated, because the stress is not applied to the panel. Further, the metallic frame 18 a according to the exemplary embodiment may be made of a conductive frame other than metal. A number of components and cost thereof can be reduced in the second embodiment, compared with the first embodiment, since it is unnecessary to use the conductor 16 mounted on the metallic frame 18 a. As described above, according to the exemplary embodiments of the present invention, the part of the polarizing plate which is adhered to the surface of the liquid crystal display panel projects outward from the external shape of the display panel. The projecting area of the polarizing plate 13 is pressed from the conductive frame to make electric contact for grounding. Therefore, uneven image on a screen is not generated, since no stress is applied to the liquid crystal display panel even though the conductive frame strongly presses the polarizing plate to make electric contact for grounding.
Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8305334 *Feb 11, 2009Nov 6, 2012Hitachi Displays, Ltd.Liquid crystal display deviceUS20090207126 *Feb 11, 2009Aug 20, 2009Hitachi Displays, Ltd.Liquid crystal display device* Cited by examinerClassifications U.S. Classification349/58International ClassificationG02F1/1333Cooperative ClassificationG02F1/133528, G02F2001/133562, G02F2201/54, G02F2202/16, G02F2202/22, G02F1/13452European ClassificationG02F1/1345DLegal EventsDateCodeEventDescriptionNov 8, 2011ASAssignmentFree format text: CHANGE OF NAME;ASSIGNOR:NEC LCD TECHNOLOGIES, LTD.;REEL/FRAME:027189/0704Effective date: 20110701Owner name: NLT TECHNOLOGIES, LTD., JAPANRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google