US5473338A — Addressing method and system having minimal cross…

Claim 1

Independent Claim 179 words

A method of improving image quality in an rms-responding passive display that includes an array of pixels defined by the overlapping areas of first and second electrodes, each pixel having an optical state controlled by addressing signals having frequency components, the display having an optical response to the frequency components of the addressing signals, the optical response characterized by a relatively constant optical response frequency band and a relatively non-constant optical response frequency band, the method comprising: determining addressing signals that select each pixel multiple times during a frame period and that provide the pixels with the desired optical state by de-emphasizing the effects of frequency components outside of the relatively constant optical response frequency band; and applying the addressing signals to the first and second electrodes, the addressing signals including image-independent addressing signals that are applied to the first electrodes and image-dependent addressing signals that are applied to the second electrodes, and the frequency components that fall outside of the constant optical response frequency band being de-emphasized by adjusting the magnitudes of components of the image-dependent addressing signals.

Claim 2

Independent Claim 179 words

A method of improving image quality in an rms-responding passive display that includes an array of pixels defined by the overlapping areas of first and second electrodes, each pixel having an optical state controlled by addressing signals having frequency components, the display having an optical response to the frequency components of the addressing signals, the optical response characterized by a relatively constant optical response frequency band and a relatively non-constant optical response frequency band, the method comprising: determining addressing signals that select each pixel multiple times during a frame period and that provide the pixels with the desired optical state by de-emphasizing the effects of frequency components outside of the relatively constant optical response frequency band; and applying the addressing signals to the first and second electrodes, the addressing signals including image-independent addressing signals that are applied to the first electrodes and image-dependent addressing signals that are applied to the second electrodes, and the frequency components that fall outside of the constant optical response frequency band being de-emphasized by adjusting the magnitudes of components of the image-dependent addressing signals.

Claim 3

Dependent Claim 43 words

The method of claim 1 in which the determining of addressing signals includes determining addressing signal waveforms that provide a predetermined rms voltage across the pixels and are modulated so that the frequency components fall predominately in the constant optical response frequency band.

Claim 4

Dependent Claim 43 words

The method of claim 2 in which the addressing signal waveforms are applied during a frame period that includes multiple addressing time intervals and in which the addressing signals are modulated by reversing their polarities during a portion of an addressing time interval.

Claim 5

Dependent Claim 21 words

The method of claim 2 in which the addressing signals waveforms are modulated in accordance with a Manchester pulsed modulation signal.

Claim 6

Dependent Claim 44 words

The method of claim 2 in which the addressing signal waveforms are applied during a frame period that includes multiple addressing time intervals and in which the addressing signals are modulated by reversing their polarities less often than once in each addressing time interval.

Claim 7

Dependent Claim 21 words

The method of claim 1 in which the determining of addressing signals includes analyzing the frequency components of the addressing signals.

Claim 8

Dependent Claim 18 words

The method of claim 1 in which the magnitudes of fewer than all of the components are adjusted.

Claim 9

Dependent Claim 71 words

The method of claim 1 in which the display is capable of displaying more than two gray levels and the determining of the addressing signals applied to the second electrodes entails the process of computing an adjustment term determined from the gray level of pixels defined by the corresponding second electrodes, the adjustment term including a correction factor that compensates for the frequency dependence of the optical response of the display.

Claim 10

Dependent Claim 87 words

The method of claim 1 in which the display is capable of displaying more than two gray levels and a virtual first electrode defines a virtual pixel at its intersection with each of the second electrodes, each virtual pixel having an associated virtual pixel information element, the virtual pixel information elements having values dependent on the gray levels of the pixels defined by the corresponding second electrode and corrected by a factor depending upon the addressing signal associated with the virtual first electrode defining the virtual pixels.

Claim 11

Dependent Claim 18 words

The method of claim 9, in which the correction factor is greater than 0.95 and less than 1.0.

Claim 12

Dependent Claim 18 words

The method of claim 9, in which the correction factor is greater than 1.0 and less than 1.1.

Claim 13

Dependent Claim 20 words

The method of claim 1 in which image independent addressing signals are applied in sequency order to the first electrodes.

Claim 14

Dependent Claim 14 words

The method of claim 1, in which the pixels comprise a liquid crystal material.

Claim 15

Independent Claim 158 words

A method of improving image quality in an rms-responding passive display that includes an array of pixels defined by the overlapping areas of first and second electrodes, each pixel having an optical state controlled by addressing signals having frequency components, the display having an optical response to the frequency components of the addressing signals, the optical response characterized by a relatively constant optical response frequency band and a relatively non-constant optical response frequency band, the method comprising: determining addressing signal waveforms that select each pixel multiple times during a frame period and that provide the pixels with the desired optical state by providing a predetermined rms voltage related to the optical response of the pixels in the relatively constant optical response frequency band, the addressing signals being adjusted in magnitude to de-emphasize the effect of frequency components that fall outside of the constant optical response frequency band; and applying the addressing signals to the first and second electrodes.

Claim 16

Independent Claim 158 words

A method of improving image quality in an rms-responding passive display that includes an array of pixels defined by the overlapping areas of first and second electrodes, each pixel having an optical state controlled by addressing signals having frequency components, the display having an optical response to the frequency components of the addressing signals, the optical response characterized by a relatively constant optical response frequency band and a relatively non-constant optical response frequency band, the method comprising: determining addressing signal waveforms that select each pixel multiple times during a frame period and that provide the pixels with the desired optical state by providing a predetermined rms voltage related to the optical response of the pixels in the relatively constant optical response frequency band, the addressing signals being adjusted in magnitude to de-emphasize the effect of frequency components that fall outside of the constant optical response frequency band; and applying the addressing signals to the first and second electrodes.

Claim 17

Dependent Claim 131 words

An addressable rms-responding passive display, comprising: first and second overlapping electrodes; an array of pixels defined by overlapping areas of the first and second electrodes, each pixel having an optical state controlled by addressing signals having frequency components, the display having an optical response to the frequency components of the addressing signals, the optical response characterized by a relatively constant optical response frequency band and a relatively non-constant optical response frequency band; and an addressing signal generator for determining addressing signals that select each pixel multiple times during a frame period and that provide the pixels with the desired optical state, the addressing signal generator including means for adjusting the magnitudes of the addressing signals to de-emphasize the effects of frequency components outside of the relatively constant optical response frequency band.

Claim 18

Dependent Claim 131 words

An addressable rms-responding passive display, comprising: first and second overlapping electrodes; an array of pixels defined by overlapping areas of the first and second electrodes, each pixel having an optical state controlled by addressing signals having frequency components, the display having an optical response to the frequency components of the addressing signals, the optical response characterized by a relatively constant optical response frequency band and a relatively non-constant optical response frequency band; and an addressing signal generator for determining addressing signals that select each pixel multiple times during a frame period and that provide the pixels with the desired optical state, the addressing signal generator including means for adjusting the magnitudes of the addressing signals to de-emphasize the effects of frequency components outside of the relatively constant optical response frequency band.

Claim 19

Dependent Claim 36 words

The display of claim 15 in which the addressing signal generator further includes a modulator to modulate addressing signals so that spectral components of the addressing signals fall predominately in the constant optical response frequency band.

Claim 20

Dependent Claim 13 words

The display of claim 16 in which the modulator includes a Manchester circuit.

Claim 21

Dependent Claim 23 words

The display of claim 15 in which the addressing signal generator includes a spectrum analyzer for determining frequency components of the addressing signals.

Claim 22

Dependent Claim 64 words

The display of claim 15 in which: the optical states of the pixels represent multiple gray levels; and the addressing signal generator generates image-dependent addressing signals by computing an adjustment term dependent upon the gray level of pixels defined by the corresponding second electrode, the adjustment term including a correction factor that compensates for the frequency dependence of the optical response of the display.

Claim 23

Dependent Claim 36 words

The display of claim 19 in which the addressing signal generator generates a virtual addressing signal for a virtual first electrode and the correction factor is related to the frequency components of the virtual addressing signal.

Claim 24

Dependent Claim 18 words

The display of claim 19 in which the correction factor is greater than 0.95 and less than 1.00.

Claim 25

Dependent Claim 18 words

The display of claim 19 in which the correction factor is greater than 1.0 and less than 1.1.

Claim 26

Independent Claim 118 words

An apparatus for addressing a high information content, rms-responding passive display including an array of pixels, each pixel having an optical state controlled by a pixel voltage and being addressed by addressing signals having frequency components, the display having an optical response dependent on the frequency components of the addressing signals, the apparatus comprising: an addressing signal generator subunit that provides addressing signals that select pixels more than once in a frame period to produce a predetermined rms value across the pixels during a frame period; and a signal adjuster that adjusts the magnitude of the addressing signals to compensate for the frequency dependence of the optical response of the display and thereby produce the desired optical response.

Claim 27

Independent Claim 118 words

An apparatus for addressing a high information content, rms-responding passive display including an array of pixels, each pixel having an optical state controlled by a pixel voltage and being addressed by addressing signals having frequency components, the display having an optical response dependent on the frequency components of the addressing signals, the apparatus comprising: an addressing signal generator subunit that provides addressing signals that select pixels more than once in a frame period to produce a predetermined rms value across the pixels during a frame period; and a signal adjuster that adjusts the magnitude of the addressing signals to compensate for the frequency dependence of the optical response of the display and thereby produce the desired optical response.

Claim 28

Dependent Claim 32 words

The apparatus of claim 23 in which the signal adjuster includes modulating the addressing signals to produce addressing signals having frequency component that fall in a relatively constant optical response frequency band.

Claim 29

Dependent Claim 14 words

The apparatus of claim 24 in which the compensation circuit includes a Manchester circuit.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-12-04	1999-06-05	1999-12-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-12-04	2003-06-05	2003-12-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-12-04	2007-06-05	2007-12-05	$7700.00	Window Closed / Lapsed

Addressing method and system having minimal crosstalk effects

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