US5233340A — Method of driving a display device

Claim 1

Independent Claim 247 words

A method of driving a display device with a plurality of scanning side electrodes and a plurality of data side electrodes which are disposed in directions intersecting each other, and a dielectric layer means interposed between said scanning side electrodes and said data side electrode, and including steps of applying plural frames per drive cycle of modulation voltages corresponding to display data to said data side electrodes, and also applying plural frames per drive cycle of writing voltages of positive or negative polarity to said scanning side electrodes through line sequencing, so as to cause picture elements composed of said dielectric layer means to emit light in response to an applied voltage which is higher than a light emitting threshold voltage, said driving method further comprising steps of thinning out the display data by selecting the number of frames to be impressed in one drive cycle with the applied voltages higher than said threshold voltage, applying a plurality of kinds of modulation voltages which are different in amplitude in each frame, wherein said voltages applied to said picture elements are different in each frame when the number of frames selected to be impressed in one cycle with applied voltages higher than said threshold voltage includes each frame, thereby to cause the picture elements to effect gradation display of a number of different brightnesses in multi-stages and wherein the number of said plural number of frames per drive cycle do not correspond to said number of different brightnesses.

Claim 2

Independent Claim 247 words

A method of driving a display device with a plurality of scanning side electrodes and a plurality of data side electrodes which are disposed in directions intersecting each other, and a dielectric layer means interposed between said scanning side electrodes and said data side electrode, and including steps of applying plural frames per drive cycle of modulation voltages corresponding to display data to said data side electrodes, and also applying plural frames per drive cycle of writing voltages of positive or negative polarity to said scanning side electrodes through line sequencing, so as to cause picture elements composed of said dielectric layer means to emit light in response to an applied voltage which is higher than a light emitting threshold voltage, said driving method further comprising steps of thinning out the display data by selecting the number of frames to be impressed in one drive cycle with the applied voltages higher than said threshold voltage, applying a plurality of kinds of modulation voltages which are different in amplitude in each frame, wherein said voltages applied to said picture elements are different in each frame when the number of frames selected to be impressed in one cycle with applied voltages higher than said threshold voltage includes each frame, thereby to cause the picture elements to effect gradation display of a number of different brightnesses in multi-stages and wherein the number of said plural number of frames per drive cycle do not correspond to said number of different brightnesses.

Claim 3

Dependent Claim 39 words

A method as in claim 1 wherein said different amplitude signals are applied in the respective frames and said voltage applied to said picture elements is equivalent to the difference between said applied modulation voltages and said writing voltages.

Claim 4

Dependent Claim 58 words

A method as in claim 2 wherein said writing voltages are Vw1 or -Vw2, said modulation voltages are OV, a voltage of a set amplitude greater than OV and less than V M , V M , Vw1=Vw2+V M , and said threshold voltage is greater than or equal to Vw2 but less than or equal to Vw1.

Claim 5

Dependent Claim 23 words

A method as in claim 3 wherein said picture elements are caused to effect gradation display in three or more levels of brightness.

Claim 6

Independent Claim 219 words

A method of cyclically driving a display device, said device including plural scanning side electrodes, plural data side electrodes disposed in directions intersecting said scanning side electrodes, a dielectric layer means interposed between said scanning side and said data side electrodes, and picture elements composed of said dielectric layer means interposed between said scanning side and said data side electrodes for emitting light in response to an applied voltage which is higher than or equal to a threshold voltage V th , said method comprising: applying plural frames of modulation voltages OV, a voltage of a set amplitude greater than OV and less than V M , or V M to said data side electrodes for each driving cycle, wherein said modulation voltages are different in amplitude in each of said plural frames and correspond to the display data; applying plural frames of positive or negative writing voltages, Vw1 or -Vw2 respectively, to said scanning side electrodes, wherein Vw1=Vw2+V M and V th is greater than or equal to Vw2 but less than or equal to Vw1, whereby said picture elements are caused to obtain gradation display of at least three brightness levels by applying plural frames of modulation and writing voltages for each drive cycle that are each lesser in number than the number of brightness levels obtained.

Claim 7

Independent Claim 219 words

A method of cyclically driving a display device, said device including plural scanning side electrodes, plural data side electrodes disposed in directions intersecting said scanning side electrodes, a dielectric layer means interposed between said scanning side and said data side electrodes, and picture elements composed of said dielectric layer means interposed between said scanning side and said data side electrodes for emitting light in response to an applied voltage which is higher than or equal to a threshold voltage V th , said method comprising: applying plural frames of modulation voltages OV, a voltage of a set amplitude greater than OV and less than V M , or V M to said data side electrodes for each driving cycle, wherein said modulation voltages are different in amplitude in each of said plural frames and correspond to the display data; applying plural frames of positive or negative writing voltages, Vw1 or -Vw2 respectively, to said scanning side electrodes, wherein Vw1=Vw2+V M and V th is greater than or equal to Vw2 but less than or equal to Vw1, whereby said picture elements are caused to obtain gradation display of at least three brightness levels by applying plural frames of modulation and writing voltages for each drive cycle that are each lesser in number than the number of brightness levels obtained.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-08-02	1997-02-01	1997-08-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-08-02	2001-02-01	2001-08-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-08-02	2005-02-01	2005-08-03	$7700.00	Window Closed / Lapsed

Method of driving a display device

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