EP0592201A1
Expired / Lapsed
EP
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Adaptive drive waveform for reducing crosstalk effects in electro-optical addressing structures
Assignee: Tektronix Inc
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Filing: 1993-10-06
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Granted: —
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Expires: 2013-10-06
Abstract
Abstract Crosstalk is reduced in any type of active matrix electro-optical display system (10) by applying a compensating signal, the value of which is dependent upon multiple data drive signals. In a preferred embodiment, a single compensating signal, equal to the inverse weighted average of all of the data drive signals applied during a row address period, can be applied to all data electrodes (20) after the data drive signals are stored in display elements (16). Such a compensating signal simultaneously reduces side-to-side crosstalk and front-to-back crosstalk to levels previously achievable for only one type of crosstalk at a time.
Inventors
- 👤 Kevin J. Ilcisin
- 👤 Dennis W. Prince
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 19:57
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3696; G09G3/3648; G09G3/3662; G09G3/3685; G09G3/3688; G09G2300/00; G09G2300/04; G09G2300/0421; G09G2300/043; G09G2310/00; G09G2310/02; G09G2310/0243; G09G2310/0248; G09G2320/00; G09G2320/02; G09G2320/0209
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
182 words
A driving method for an electro-optical display having an array of display elements defined by the intersections of plural data drive electrodes arranged in columns and plural data strobe electrodes arranged in rows, the display elements in a row storing information applied to the data drive electrodes during a row address period in response to a data strobe signal applied to the data strobe electrode of the row and display elements in subsequent rows storing information applied to the data strobe electrodes during subsequent row address periods of a frame addressing period, the mean square average voltage across portions of each display element during the frame address period being incidentally affected by crosstalk, the method comprising: determining a compensating signal voltage value corresponding to the information applied to multiple data drive electrodes during the row address period; and applying the compensating signal to the data drive electrodes during the row address period, whereby the compensating signal offsets much of the crosstalk to more accurately maintain a nominal mean square voltage value across portions of the display element during the frame addressing period.
Claim 2
Dependent Claim
29 words
The method of claim 1 in which the compensating signal voltage value corresponds to the information applied to all of the data drive electrodes during the row address period.
Claim 3
Dependent Claim
42 words
The method of claim 1 in which the row address period is divided into a first and second phase, the information being applied to the data drive electrodes during the first phase and the compensating signal being applied during the second phase.
Claim 4
Dependent Claim
27 words
The method of claim 1 in which the step of applying the compensating signal includes applying a single compensating signal to all of the data drive electrodes.
Claim 5
Dependent Claim
41 words
The method of claim 1 in which the step of determining a compensating signal includes determining the inverse weighted average of all of the information applied to the data drive electrodes during the row address period to the data drive electrodes.
Claim 6
Dependent Claim
25 words
The method of claim 5 in which the step of determining the inverse weighted average is performed by a summing circuit of the analog type.
Claim 7
Dependent Claim
20 words
The method of claim 5 in which the step of determining the inverse weighted average is performed by digital calculations.
Claim 8
Dependent Claim
20 words
The method of claim 1 in which the electro-optical display comprises an active matrix display of a liquid crystal type.
Claim 9
Dependent Claim
18 words
The method of claim 8 in which the electro-optical display is of a plasma addressed liquid crystal type.
Claim 10
Dependent Claim
184 words
A driving method for an electro-optical display having an array of display elements defined by the intersections of plural data drive electrodes arranged in columns and plural data strobe electrodes arranged in rows, the display elements in a row storing information applied to the data drive electrodes during a row address period in response to a data strobe signal applied to the data strobe electrode of the row and display elements in subsequent rows storing information applied to the data strobe electrodes during subsequent row address periods of a frame addressing period, the mean square average voltage across portions of each display element during the frame address period being incidentally affected by crosstalk, the method comprising: applying the information onto the data drive electrodes; storing the information applied onto the data drive electrodes in the display elements of a row; removing the information from the data drive electrodes; and substituting a compensating signal having a voltage value corresponding to the weighted average of the information applied to the data drive electrodes onto all of the data drive electrodes, whereby the compensating signal reduces crosstalk.
Claim 11
Dependent Claim
25 words
The method of claim 10 in which the step of substituting a compensating signal includes determining the compensating voltage value using an analog summing circuit.
Claim 12
Dependent Claim
23 words
The method of claim 10 in which the step of applying a compensating signal includes determining the compensating voltage value using digital calculations.
Claim 13
Dependent Claim
20 words
The method of claim 10 in which the electro-optical display comprises an active matrix display of the liquid crystal type.
Claim 14
Dependent Claim
19 words
The method of claim 13 in which the active matrix display is of the plasma addressed liquid crystal type.
Claim 15
Dependent Claim
96 words
In an electro-optical display having an addressing structure for addressing and delivering data drive signals on data drive electrodes to each of plural display elements arranged at address locations within an array and a data driver for delivering the data drive signals to plural address locations within the array during an addressing period, the display elements having incidental electrical couplings that carry incidental data components among the display elements, the improvement comprising: a compensating signal driver for applying onto the data drive electrodes a compensating signal having a voltage value determined from multiple data drive signals.
Claim 16
Dependent Claim
41 words
The display of claim 15 in which the row address period is divided into first and second phases, the information being applied to the data drive electrodes during the first phase and the compensating signal being applied during the second phase.
Claim 17
Dependent Claim
30 words
The display of claim 15 in which the compensating signal is determined by all of the data drive signals applied to the data drive electrode during the row addressing period.
Claim 18
Dependent Claim
24 words
The display of claim 15 in which the compensating signal is determined by the inverse weighted average of all of the data drive signals.
Claim 19
Dependent Claim
20 words
The display of claim 15 in which a single compensating signal is applied to all of the data drive electrodes.
Claim 20
Dependent Claim
20 words
The display of claim 15 in which the electro-optical display comprises an active matrix display of the liquid crystal type.
Claim 21
Dependent Claim
22 words
The display of claim 20 in which the electro-optical display comprises an active matrix display of the plasma addressed liquid crystal type.
References Cited (Backward Citations)
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