Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3906290 A
Publication typeGrant
Publication dateSep 16, 1975
Filing dateSep 19, 1973
Priority dateJan 16, 1973
Also published asDE2348260A1, DE2348260B2, DE2348260C3, DE2366123C2
Publication numberUS 3906290 A, US 3906290A, US-A-3906290, US3906290 A, US3906290A
InventorsKoichiro Kurahashi, Hiroshi Tottori
Original AssigneeMitsubishi Electric Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Display apparatus
US 3906290 A
Abstract
A display apparatus capable of displaying a picture with half-brightness (gray scale) by use of a display panel such as a plasma display panel, comprising a plurality of picture elements or luminescent dots which assume either a luminescent condition or a nonluminescent condition. A halftone picture display can be achieved according to two methods, the first being that the mean brightness of the picture element or luminescent dot be made porportional to the turn-on period. The second method is that the mean brightness of the picture element or luminescent dot for the turn-on period be made proportional to the frequency of the sustaining voltage. Several embodiments are disclosed which incorporate one or both of the foregoing principles to achieve a halftone display.
Images(29)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent Kurahashi et a1.

[ Sept. 16, 1975 DISPLAY APPARATUS Assignee:

Mitsubishi Denki Kabushiki Kaisha,

Tokyo, Japan Filed:

Sept. 19, 1973 App]. No.: 398,791

3,575,492 4/1971 Nester et a1 340/324 UX 3,590,156 6/1971 315/169 TV 3,659,149 4/1972 315/169 TV 3,778,673 12/1973 Eisenberg' et a1. 315/169 R Primary ExaminerMichael J. Lynch Assistant Examiner-B. P. Davis Attorney, Agent, or Firm-Oblon, Fisher, Spivak, McClelland & Maier [5 7 ABSTRACT A display apparatus capable of displaying a picture with half-brightness (gray scale) by use of a display panel such as a plasma display panel, comprising a plurality of picture elements or luminescent dots which assume either a luminescent condition or a nonluminescent condition. A halftone picture display can be achieved according to two methods, the first being that the mean brightness of the picture element or luminescent dot be made porportional to the turn-on period. The second method is that the mean brightness of the picture element or luminescent dot for the turn-on period be made proportional to the frequency of the sustaining voltage. Several embodiments are disclosed which incorporate one or both of the foregoing principles to achieve a halftone display.

26 Claims, 40 Drawing Figures PATENIEBSEP isms 3. 896.290 sum 1,

FIG.|

SHEET PATENTEU SEP I 6 I975 SHEET PIC-3.5

PATENIEU SE? is ms SHEET FIG.6

PATENTEU SEP 1 6 I975 S'riEET FIGS PATENTED SEP 1 6 I975 SHEET PATENTED SEP 1 6 I975 FIG.2I

SHEET FIG.23

PATENTEB SE? is ms SHEET F I G 26

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3493956 *Feb 5, 1968Feb 3, 1970Stewart Warner CorpTraveling message display
US3575492 *Jul 10, 1969Apr 20, 1971Rca CorpTurnoff method and circuit for liquid crystal display element
US3590156 *Aug 28, 1968Jun 29, 1971Zenith Radio CorpFlat panel display system with time-modulated gray scale
US3659149 *Nov 18, 1970Apr 25, 1972Energy Conversion Devices IncInformation display panel using amorphous semiconductor layer adjacent optical display material
US3778673 *Jun 21, 1971Dec 11, 1973Burroughs CorpLow power display driver having brightness control
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4183062 *Aug 7, 1978Jan 8, 1980Rca CorporationRow addressing apparatus for a bistable display device
US4383256 *May 28, 1980May 10, 1983Mitsubishi Denki Kabushiki KaishaDisplay device
US4559535 *Jul 12, 1982Dec 17, 1985Sigmatron Nova, Inc.System for displaying information with multiple shades of a color on a thin-film EL matrix display panel
US4769713 *Feb 26, 1987Sep 6, 1988Hosiden Electronics Co. Ltd.Method and apparatus for multi-gradation display
US4870324 *Jan 27, 1987Sep 26, 1989Mitsubishi Denki Kabushiki KaishaHalf-tone display system for a flat matrix type cathode-ray tube
US5146213 *Aug 20, 1990Sep 8, 1992Christian BrunelElectroluminescent display with memory effect and half-tones
US5541618 *Mar 16, 1995Jul 30, 1996Fujitsu LimitedMethod and a circuit for gradationally driving a flat display device
US5724054 *Jul 1, 1996Mar 3, 1998Fujitsu LimitedMethod and a circuit for gradationally driving a flat display device
US5874932 *Dec 29, 1994Feb 23, 1999Fujitsu LimitedPlasma display device
US5886773 *Feb 28, 1996Mar 23, 1999Fuji Photo Film Co., Ltd.Method and apparatus for controlling exposure
US6023258 *Mar 29, 1996Feb 8, 2000Fujitsu LimitedFlat display
US6064357 *Oct 2, 1996May 16, 2000Pioneer Electrical CorporationDriving method and apparatus for light emitting device
US6097357 *Jul 3, 1997Aug 1, 2000Fujitsu LimitedFull color surface discharge type plasma display device
US6100939 *Sep 16, 1996Aug 8, 2000Hitachi, Ltd.Tone display method and apparatus for displaying image signal
US6333766Aug 8, 2000Dec 25, 2001Hitachi, Ltd.Tone display method and apparatus for displaying image signal
US6587084Jul 10, 1998Jul 1, 2003Orion Electric Co., Ltd.Driving method of a plasma display panel of alternating current for creation of gray level gradations
US6630916Dec 3, 1999Oct 7, 2003Fujitsu LimitedMethod and a circuit for gradationally driving a flat display device
US6787995Sep 5, 2000Sep 7, 2004Fujitsu LimitedFull color surface discharge type plasma display device
US6838824Nov 27, 2001Jan 4, 2005Fujitsu LimitedFull color surface discharge type plasma display device
US6861803Sep 5, 2000Mar 1, 2005Fujitsu LimitedFull color surface discharge type plasma display device
US7030563Mar 29, 2004Apr 18, 2006Hitachi, Ltd.Full color surface discharge type plasma display device
US7133007Mar 24, 2004Nov 7, 2006Hitachi, Ltd.Full color surface discharge type plasma display device
US7208877Aug 2, 2004Apr 24, 2007Hitachi, Ltd.Full color surface discharge type plasma display device
US7825596Apr 14, 2006Nov 2, 2010Hitachi Plasma Patent Licensing Co., Ltd.Full color surface discharge type plasma display device
EP0674303A2 *Nov 27, 1991Sep 27, 1995Fujitsu LimitedA circuit for gradationally driving a flat display device
WO1999021159A1 *Oct 2, 1998Apr 29, 1999Motorola IncMethod for controlling brightness in a flat panel display
Classifications
U.S. Classification348/797, 348/800, 345/63
International ClassificationG09G3/28, G09G3/20, G09G3/288
Cooperative ClassificationG09G3/2946, G09G2310/0275, G09G3/297, G09G3/2022, G09G2310/0224, G09G3/296, G09G2310/0267
European ClassificationG09G3/294N, G09G3/20G6F