Source: http://www.google.com/patents/US7944407?dq=7,007,239
Timestamp: 2014-07-12 17:16:40
Document Index: 391513366

Matched Legal Cases: ['Application No. 2000', 'art 20', 'art 20', 'art 21', 'art 22', 'art 23', 'art 27', 'art 28', 'art 25', 'art 26', 'art 27', 'art 28', 'art 25', 'art 26', 'art 20', 'art 27']

Patent US7944407 - Display apparatus - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA display apparatus, that can prevent thermal destruction and burning with a simple structure, has been disclosed. In the apparatus it is judged that there is possibility of a pattern, whose area with high brightness is small, being displayed frequently, when a state in which the total light emission...http://www.google.com/patents/US7944407?utm_source=gb-gplus-sharePatent US7944407 - Display apparatusAdvanced Patent SearchPublication numberUS7944407 B2Publication typeGrantApplication numberUS 11/202,061Publication dateMay 17, 2011Filing dateAug 12, 2005Priority dateSep 25, 2000Also published asCN1160682C, CN1350280A, DE60136425D1, DE60143976D1, EP1191511A2, EP1191511A3, EP1191511B1, EP1959418A2, EP1959418A3, EP1959418B1, US20020154073, US20050264489, US20080284687, US20100141691Publication number11202061, 202061, US 7944407 B2, US 7944407B2, US-B2-7944407, US7944407 B2, US7944407B2InventorsAyahito Kojima, Shigeki Kameyama, Hirohito Kuriyama, Yoshikazu Kanazawa, Toshio UedaOriginal AssigneeFujitsu Hitachi Plasma Display LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (17), Non-Patent Citations (4), Referenced by (1), Classifications (15), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetDisplay apparatusUS 7944407 B2Abstract A display apparatus, that can prevent thermal destruction and burning with a simple structure, has been disclosed. In the apparatus it is judged that there is possibility of a pattern, whose area with high brightness is small, being displayed frequently, when a state in which the total light emission pulse number remains large occurs with high frequency, and if such a state is detected, the total light emission pulse number (sustain frequency) is reduced to prevent the thermal destruction and burning.
said control part increases said total number of times of light emission when said second state lasts more than said predetermined period. Description
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Continuation of application Ser. No. 09/929,049, filed Aug. 15, 2001, now abandoned, and claims the benefit of Japanese Application No. 2000-290981 filed Sep. 25, 2000.
BACKGROUND OF THE INVENTION The present invention relates to a display apparatus such as a plasma display (PDP) apparatus. More particularly, the present invention relates to a display apparatus in which the display brightness is determined by the number of times of light emission and in which the number of times of light emission in each cell of the display frame of a display can be changed.
FIG. 2 is a diagram that shows the drive waveform of a subframe in the PD apparatus of so-called �address/sustain discharge period separated type�write address method.� The subframe will be described later. With reference to FIG. 2, actions in the PD apparatus are described briefly. In this example, a subframe is divided into the reset period, the address period, and the sustain discharge period. In the reset period, all the cells are put into an identical state. In the address period, a scanning pulse is applied to the Y electrode sequentially and an address pulse is applied to the address electrode according to the display data (address data) in synchronization with the application of the scanning pulse. There may be the case in which an address pulse is applied to the Y electrode of a cell that is lit or the case in which an address pulse is applied to the Y electrode of a cell that is not lit. In the cell to which an address pulse is applied, an address discharge is caused to occur and wall charges are accumulated on the electrode of the cell or eliminated. This action is carried out for all the lines. All the cells are thus set to each state according to the display data of the subframe, and the wall charges required for the sustain discharge between the X electrode and the Y electrode of the lit cell are accumulated. In the sustain period, a sustaining pulse is applied to the X electrode and the Y electrode alternately, a discharge is caused to occur in the cell on which wall charges are accumulated, and the cell emits light. In this case, the brightness is determined by the length of the sustain discharge period, that is, the number of times of sustaining pulse.
SUMMARY OF THE INVENTION The object of the present invention is to realize a display apparatus that can prevent thermal destruction and burning with a simple structure.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments in which the present invention is applied to the plasma display (PDP) apparatus are described below. The present invention is not restricted to these, but can be applied to any display apparatus as long as the display brightness is determined by the number of times of light emission, and the total number of times of light emission in each cell of the display frame of a screen can be changed according to the power consumed in the apparatus.
FIG. 9 is a diagram that shows the structure of the power control part 20 in the PDP apparatus in the second embodiment of the present invention. As shown in FIG. 9, the power control part 20 in the second embodiment comprises the frame length operation part 21, the load rate operation part 22, and the sustain frequency operation part 23, similarly as the conventional power control part in FIG. 4, and moreover, a weighted mean operation part 27, a consumed power judgment part 28, the time judgment part 25, and the sustain frequency control part 26. The weighted mean operation part 27, the consumed power judgment part 28, the time judgment part 25, and the sustain frequency control part 26 are realized by a CPU. The control actions in the power control part 20 in the second embodiment are shown in the flow chart in FIG. 10 In the second embodiment, the weighted mean MW, instead of the sustain frequency, of the display data is monitored. In step S21, the weighted mean operation part 27 calculates the weighted mean for each frame. The weighted mean can be calculated from the display data converted for each subframe, and the consumed power can be estimated from this value. Concretely, the weighted mean can be obtained in a manner that the load rate of each subframe is weighted and the sum of those values is divided by the number of the subframes.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5956014Oct 18, 1995Sep 21, 1999Fujitsu LimitedBrightness control and power control of display deviceUS6072448 *Sep 30, 1997Jun 6, 2000Fujitsu LimitedPlasma display device driven in a subframe modeUS6081254 *Aug 12, 1994Jun 27, 2000Hitachi, Ltd.Color correction system of imaging apparatusUS6373702 *Dec 21, 2000Apr 16, 2002Pioneer CorporationCooling structure and display apparatus containing the cooling structureUS6597333 *Jun 10, 1999Jul 22, 2003Pioneer Electronic CorporationMethod of and system for controlling brightness of plasma display panelEP0841652A1Sep 10, 1997May 13, 1998Fujitsu LimitedControlling power consumption of a display unitEP0845769A1Oct 6, 1997Jun 3, 1998Fujitsu LimitedPlasma display device driven in a subframe modeEP0945845A2Feb 16, 1999Sep 29, 1999Fujitsu LimitedPower consumption control in display unitEP0965974A1Jun 16, 1999Dec 22, 1999Pioneer Electronic CorporationMethod of and system for controlling brightness of plasma display panelJP2000010522A Title not availableJP2001134197A Title not availableJPH0863124A Title not availableJPH08248819A Title not availableJPH10207423A Title not availableJPH10214059A Title not availableJPH10232647A Title not availableWO2000017845A1Sep 14, 1999Mar 30, 2000Matsushita Electric Ind Co LtdColour display apparatus* Cited by examinerNon-Patent CitationsReference1European Search Report, dated Mar. 3, 2006, for related European Patent Application No. EP 01 30 7211.2Final Office Action mailed Jul. 26, 2004; U.S. Appl. No. 09/929,049.3Non-Final Office Action mailed Feb. 11, 2004; U.S. Appl. No. 09/929,049.4Non-Final Office Action mailed Mar. 11, 2005; U.S. Appl. No. 09/929,049.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS20120242631 *Dec 9, 2010Sep 27, 2012Kazuki SawaPlasma display device and method for driving plasma display panel* Cited by examinerClassifications U.S. Classification345/63, 345/60International ClassificationG09G3/20, G09G3/28, G09G3/294, G09G3/288, G09G3/291Cooperative ClassificationG09G2330/045, G09G2320/046, G09G2360/16, G09G2330/02, G09G2320/0626, G09G3/2944, G09G2330/021European ClassificationG09G3/294FLegal EventsDateCodeEventDescriptionJun 12, 2013ASAssignmentOwner name: HITACHI CONSUMER ELECTRONICS CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HITACHI, LTD.;REEL/FRAME:030648/0217Effective date: 20130607Mar 5, 2012ASAssignmentOwner name: HITACHI, LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HITACHI PLASMA DISPLAY LIMITED;REEL/FRAME:027801/0918Effective date: 20120224Mar 2, 2012ASAssignmentFree format text: CHANGE OF NAME;ASSIGNOR:FUJITSU HITACHI PLASMA DISPLAY LIMITED;REEL/FRAME:027801/0600Effective date: 20080401Owner name: HTACHI PLASMA DISPLAY LIMITED, 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