Source: http://www.google.com/patents/US6288489?dq=6377161
Timestamp: 2016-06-27 04:26:03
Document Index: 384950887

Matched Legal Cases: ['arts 181', 'arts 182', 'arts 181', 'arts 182', 'arts 181', 'arts 181', 'arts 181']

Patent US6288489 - Plasma display device having a heat conducting plate in the main frame - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA plasma display device is comprised of a plasma display panel, a circuit board having a driving circuit for driving the plasma display panel, a main frame for supporting the circuit board, and a uniform heat-conducting plate to be fixed to the plasma display panel. In this structure, although the uniform...http://www.google.com/patents/US6288489?utm_source=gb-gplus-sharePatent US6288489 - Plasma display device having a heat conducting plate in the main frameAdvanced Patent SearchPublication numberUS6288489 B1Publication typeGrantApplication numberUS 09/196,110Publication dateSep 11, 2001Filing dateNov 20, 1998Priority dateMar 25, 1998Fee statusLapsedAlso published asDE69825030D1, DE69825030T2, EP0945888A2, EP0945888A3, EP0945888B1Publication number09196110, 196110, US 6288489 B1, US 6288489B1, US-B1-6288489, US6288489 B1, US6288489B1InventorsHideki Isohata, Hideo KimuraOriginal AssigneeFujitsu LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (5), Referenced by (73), Classifications (11), Legal Events (9) External Links: USPTO, USPTO Assignment, EspacenetPlasma display device having a heat conducting plate in the main frame
US 6288489 B1Abstract
a plasma display panel; a circuit board having a driving circuit for driving the plasma display panel; a main frame for supporting the circuit board; and a uniform heat-conducting plate supported by said main frame and fixed to said plasma display panel, said uniform heat-conducting plate comprising a plurality of convex and concave parts, said convex parts being positioned closer to the plasma display panel than said concave parts and said concave parts holding an adhesive affixing the uniform heat-conducting plate to the plasma display panel. 2. The plasma display device according to claim 1, wherein said main frame further comprises a heat dissipating part from which heat generated by the plasma display panel is transferred outside of the main frame.
a plasma display panel; a circuit board having a driving circuit for driving the plasma display panel; a main frame for supporting the circuit board; and a uniform heat-conducting plate supported by said main frame and affixed to said plasma display panel, said uniform heat-conducting plate having on one surface thereof a plurality of spacers adjoining the plasma display panel and said uniform heat-conducting plate being affixed to the plasma display panel by an adhesive disposed between the spacers. 7. A plasma display device, comprising:
a plasma display panel; a circuit board having a driving circuit for driving the plasma display panel; a main frame supporting the circuit board; a uniform heat-conducting plate supported by said main frame and affixed to said plasma display panel; and said main frame having a plurality of tabs and said uniform heat-conducting plate having a plurality of sockets, in each of which sockets a respective tab is inserted so as to engage the respective tabs to said corresponding sockets. 8. The plasma display device according to claim 7, wherein the respective tabs and the corresponding sockets are screwed together in a condition that the respective tabs are inserted into the corresponding sockets.
a plasma display panel; a circuit board having a driving circuit for driving the plasma display panel; a main frame supporting the circuit board and having a first rib formed along a periphery of the main frame; and a uniform heat-conducting plate supported by said main frame and affixed to said plasma display panel. 10. A plasma display device comprising:
a plasma display panel; a circuit board having a driving circuit for driving the plasma display panel; a main frame supporting the circuit board; and a uniform heat-conducting plate contacting said plasma display panel; said uniform heat-conducting plate being affixed to said main frame by screws. 11. The plasma display device according to claim 10, wherein said uniform heat-conducting plate is affixed to said plasma display panel by an adhesive.
On one surface of the front transparent substrate 21, facing the back substrate 22, a plurality of display electrodes (sustaining electrodes) 26 made from a transparent conductive material are formed in the direction to intersect the address electrodes 23. These display electrodes 26 are disposed in parallel with each other, and each display electrode forms an electrode pair with an adjacent address electrode 23. On each of the display electrodes 26, a metal bus electrode 27 is formed to increase the conductivity of the display electrodes. In addition, a dielectric layer 28 is formed to cover the display electrodes 26 and the bus electrodes 27. ITO (indium tin oxide) or tin oxide (SnO2) can be used as a transparent conductive material to form the display electrodes 26, and the metal bus electrodes 27 are made of, for example, a three layer electrode of Cr—Cu—Cr. Further, the dielectric layer 28 is covered by a protection layer 29 made from magnesium oxide (MgO).
FIG. 2 is an exploded view, in an oblique direction, of a conventional plasma display device which incorporates the PDP shown in FIG. 1. In FIG. 2, reference numeral 10 denotes the PDP shown in FIG. 1, 4 denotes a tip tube used to exhaust the air inside the PDP, 17 a denotes a main frame, 11 and 12 denote circuit boards having driving circuits etc. and 13 denotes a driver.
As described above using FIG. 1, PDP 10 is basically made of a pair of glass plates, and therefore, the circuit boards 11 and 12 cannot be directly fixed to PDP 10 with screws. Usually, the circuit boards 11 and 12 are fixed to the main frame 17 a made of, for example, a metal plate, and thereafter, the main frame 17 a is stuck to PDP 10 with, for example, a double coated adhesive tape. Reference numerals 14 and 15 denote covers for protecting the respective circuit boards 11 and 12, and 16 denotes a driver cover for protecting the driver 13, which driver cover also functions as a heat sink for the driver 13.
Even after the PDP 10 is affixed to the frame 17 a, to which circuit boards 11 and 12 have already been attached, a requirement to replace the PDP 10 sometimes occurs, for various reasons, as mentioned in the Description of the Prior Art. Such reasons include a defect found in the attached PDP 10 and a necessity to use a different type of PDP. In such cases, PDP 10 and the frame 17 a should be replaced together because frame 17 a is not easily separated from PDP 10 once they have been affixed together. The replaced PDP 10 and affixed frame 17 a are usually discarded.
On the other hand, main frame 17 a, which contacts the PDP 10, is required to absorb the heat generated by PDP 10 quickly and uniformly and move it quickly to the outside of the device. To this end, frame 17 a should be made from a material having a large thermal conductivity as well as having a large surface area. However, since a possibility to abandon the frame 17 a along with the PDP 10 must be taken in account as mentioned above, a complicated and high cost structure to improve the heat absorption and heat discharge cannot be used for the main frame 17 a. FIG. 3 is a cross-sectional view showing an example of a structure to improve the uniform heat-conduction between the PDP 10 and the main frame 17 a. FIG. 3 is an enlarged view of the circled part shown in FIG. 2.
The frame 17 a is affixed to PDP 10 by means of strips of adhesive 1 made of, for example, double coated adhesive tape. The strips of adhesive 1 are arranged at almost equal distances between the frame 17 a and PDP 10. In addition, strips of heat-conductive rubber sheet 2 are disposed between strips 1. Since strips of heat-conductive rubber sheet 2 have a high thermal conductivity, they are expected to quickly absorb the heat generated by the PDP 10 and conduct it to the main frame 17 a, thus realizing the uniform heat-conduction between the PDP 10 and the main frame 17 a. However, this structure does not improve the heat discharge efficiency of the main frame 17 a. Further, since PDP 10 is made of glass plates and the panel size is becoming larger, ensuring the strength of the panel is very important. As mentioned above, however, the main frame 17 a has been made from a thin metal plate since it cannot be made to have a complicated and high cost structure. Accordingly, a sufficient mechanical strength of a plasma display device could not be obtained when circuit boards 11 and 12 were simply installed to frame 17 a. Accordingly, the conventional plasma display device usually obtains its mechanical strength from an external framework member to which the plasma display device is installed. Various external framework members are used, depending on the types of apparatuses in which the plasma display device is installed. When the plasma display device is conveyed, it is fastened to a protection member. In such cases, frame 17 a and the external framework member are engaged together with, for example, screws via circuit boards 11 and 12 and covers 14 and 15.
To correct for the lack of stiffness, for example, the main frame 17 a is made thick. However, if frame 17 a is thickened, it is difficult to maintain the flatness of the main frame 17 a. When the main frame 17 a is made thin, PDP 10 does not receive a large load even though the flatness of the main frame 17 a is low, that is, little warp exists. This does not result in a serious problem. On the contrary, when the main frame is made thick and the panel 10 is affixed to the warped frame 17 a, it receives a large load. This results in breakage of the panel.
In the conventional plasma display device mentioned above, the possibility of discarding the main frame 17 a with PDP 10 has been assumed, and therefore, the main frame 17 a could not have a complicated structure which invites an increase of the manufacturing cost. On the contrary, the present invention allows the main frame 17 to have a complicated structure so as to improve its heat discharge ability and mechanical strength by providing the uniform heat-conducting plate 18 between the PDP 10 and the main frame 17.
FIG. 5A shows a very simple structure in which a rolled aluminum plate 18 a is affixed to PDP 10 with an adhesive 1 a. Although a uniform layer of adhesive 1 a is provided in the structure shown in FIG. 5A, the present invention makes it possible to place a double coated adhesive tape between the plate 18 a and PDP 10.
In a case where the adhesive layer is formed on the entire surface of plate 18 a, this may result in a cost increase. FIG. 5B shows another example of a plate in which adhesive layers are partly formed between the plate 18 b and PDP 10. As shown, plate 18 b is comprised of a plurality of stripe-like convex parts 181 and concave parts 182 which are alternately and periodically formed on the plate 18 b. This plate 18 b contacts with PDP 10 through the convex parts 181. On the other hand, in the concave parts 182, adhesive layers 1 b are formed between the plate 18 b and PDP 10 so as to affix them together. The adhesive material must have an excellent thermal resistance and thermal conduction, and therefore, a double coated adhesive tape, “VHBTM Acrylic Form Structural Adhesive Tape” made by 3M Co. is used in this embodiment. In the structure shown in FIG. 5B, the double coated adhesive tape is periodically placed so that the tape cost is reduced as compared with the case where the adhesive tape is placed on the entire surface of PDP 10 as shown in FIG. 5A. The convex parts 181 where no adhesive tape is placed may be processed to contact with PDP 10 so as not to form a gap between plate 18 b and PDP 10. Ideally, the convex parts 181 are expected to completely contact with PDP 10, however, a small gap depending on the processing accuracy may exist.
Plate 18 b may be realized by processing a rolled aluminum plate in a drawing or a press working. In addition, the periodically formed convex and concave parts improve the mechanical strength of the plate 18 b. The embodiment shown in FIG. 4 uses plate 18 b as the uniform heat-conducting plate 18. From this figure, it is clearly understood that a plurality of convex and concave parts are formed in a stripe form.
FIG. 5C shows still another example of the uniform heat-conducting plate 18. Reference numeral 18 c denotes the uniform heat-conducting plate of this example, the plate 18 c which has the same effect as that of the plate 18 b shown in FIG. 5A without conducting the drawing or the press working mentioned above. In this example, therefore, spacers 3 are disposed in places corresponding to the convex parts 181 of the plate 18 b, that is, between the adhesives 1 c. As a result, this example can easily realize a low cost plate because the above mentioned drawing or the press working method is no longer necessary.
In the above mentioned three examples of plate 18, the heat generated by the PDP 10 is uniformly conducted to the respective plate 18 a, 18 b or 18 c so that no hot spot is formed on the plate 18. Then the heat is quickly discharged to the outside of the device through the main frame 17 which is attached to the plate 18 a, 18 b or 18 c. FIG. 6A is an exploded view, in an oblique direction, of the structure for coupling the main frame and the uniform heat-conducting plate. As mentioned above, the uniform heat-conducting plate 18 may be discarded with PDP 10, and therefore, it cannot have a complicated structure which may increase the cost. However, the embodiment shown in FIG. 4 forms the “complicated structure” on the main frame 17, which support the relatively low cost plate 18, so as to realize the above mentioned various functions.
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HIDEKI;KIMURA, HIDEO;REEL/FRAME:009628/0549Effective date: 19981112Feb 17, 2005FPAYFee paymentYear of fee payment: 4Dec 23, 2005ASAssignmentOwner name: HITACHI, LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUJITSU LIMITED;REEL/FRAME:017105/0910Effective date: 20051018Apr 13, 2007ASAssignmentOwner name: HITACHI PLASMA PATENT LICENSING CO., LTD., JAPANFree format text: TRUST AGREEMENT REGARDING PATENT RIGHTS, ETC. DATED JULY 27, 2005 AND MEMORANDUM OF UNDERSTANDING REGARDING TRUST DATED MARCH 28, 2007;ASSIGNOR:HITACHI LTD.;REEL/FRAME:019147/0847Effective date: 20050727Owner name: HITACHI PLASMA PATENT LICENSING CO., LTD.,JAPANFree format text: TRUST AGREEMENT REGARDING PATENT RIGHTS, ETC. DATED JULY 27, 2005 AND MEMORANDUM OF UNDERSTANDING REGARDING TRUST DATED MARCH 28, 2007;ASSIGNOR:HITACHI LTD.;REEL/FRAME:019147/0847Effective date: 20050727Oct 29, 2008ASAssignmentOwner name: HITACHI PLASMA PATENT LICENSING CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HITACHI LTD.;REEL/FRAME:021785/0512Effective date: 20060901Feb 11, 2009FPAYFee paymentYear of fee payment: 8Apr 19, 2013REMIMaintenance fee reminder mailedSep 11, 2013LAPSLapse for failure to pay maintenance feesOct 29, 2013FPExpired due to failure to pay maintenance feeEffective date: 20130911RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services