Method and apparatus for reducing discontinuities in an active addressing display system

• US 5,475,397 A
• Filed: 07/12/1993
• Issued: 12/12/1995
• Est. Priority Date: 07/12/1993
• Status: Expired due to Term

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Saidi, Ali
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Saras, Steven J.
• Application Number:
  US08/089,199
• Time in Patent Office: 883 Days
• Field of Search: 345/84, 345/90, 345/94, 345/95, 345/97, 345/98, 345/99, 345/100, 345/103, 345/197, 345/210, 340/825.44, 359/54, 359/55
• US Class Current: 345/95
• CPC Class Codes: G09G 3/3625 using active addressing

Abstract

An electronic device (605) for presenting data comprises a display (600) having at least first and second segments (705, 710) comprising, respectively, first and second pluralities of rows, wherein at least one overlapping row (637) is included in both the first and second segments (705, 710). A first driving circuit (650) coupled to the display (600) drives, during a first set of time periods, the first plurality of rows with a first set of orthonormal functions, including a first at least one modified orthonormal function for driving the at least one overlapping row (637), and a second driving circuit (652) coupled to the display (600) drives, during a second set of time periods, the second plurality of rows with a second set of orthonormal functions, including a second at least one modified orthonormal function for driving the at least one overlapping row (637).

Claims

1. A method for addressing a display, the method comprising the steps of:

transforming a first subset of received image data utilizing a plurality orthonormal functions to generate a first plurality of column voltages;

transforming a second subset of the received image data utilizing the plurality of orthonormal functions to generate a second plurality of column voltages, wherein a portion of the second subset of the received image data is also included in the first subset of the received image data such that the portion is transformed twice;

driving a first plurality of rows of the display during a first set of time periods;

applying the first plurality of column voltages to columns of the display during the first set of time periods;

driving a second plurality of rows of the display during a second set of time periods, wherein the second plurality of rows includes at least one display row which is also driven during the first set of time periods; and

applying the second plurality of column voltages to the columns of the display during the second set of time periods.

2. The method according to claim 1, wherein the step of driving the first plurality of rows of the display comprises the steps of:

deriving a first set of row voltages from the plurality of orthonormal functions, wherein coefficients of at least a fast orthonormal function included in the plurality of orthonormal functions are divided by two prior to derivation of a first subset of corresponding row voltages included in the first set of row voltages; and

applying the first set of row voltages to the first plurality of rows during the first set of time periods, wherein the first subset of corresponding row voltages is applied to the at least one display row that is driven during both the first and second sets of time periods.

3. The method according to claim 2, wherein the step of driving the second plurality of rows of the display comprises the steps of:

deriving a second set of row voltages from the plurality of orthonormal functions, wherein coefficients of at least a second orthonormal function included in the plurality of orthonormal functions are divided by two prior to derivation of a second subset of corresponding row voltages included in the second set of row voltages; and

applying the second set of row voltages to the second plurality of rows during the second set of time periods, wherein the second subset of corresponding row voltages is applied to the at least one display row that is driven during both the first and second sets of time periods.

4. The method according to claim 1, wherein the received image data is processed in the form of an image data matrix, and wherein the step of transforming the first subset of the received image data comprises the step of:

transforming a first subset of rows of the image data matrix utilizing the plurality of orthonormal functions to generate the first plurality of column values.

5. The method according to claim 4, wherein the step of transforming the second subset of the received image data comprises the step of:

transforming a second subset of rows of the image data matrix utilizing the first plurality of orthonormal functions to generate the second plurality of column values, wherein the second subset of rows includes at least one image data row that is also included in the first subset of rows such that the at least one image data row is transformed twice.

6. An electronic device for presenting data, the electronic device comprising:

a receiver for receiving image data;

a display having at least first and second segments comprising, respectively, first and second pluralities of rows;

first driving means coupled to the display for driving, during a first set of time periods, the first plurality of rows with a plurality of orthonormal functions, at least one of which has been modified to generate a first modified orthonormal function;

second driving means coupled to the display for driving, during a second set of time periods, the second plurality of rows with the plurality of orthonormal functions, at least one of which has been modified to generate a second modified orthonormal function wherein;

at least one display row included in the second pluralities of rows is also included in the first plurality of rows such that the at least one display row is driven during both the first and second sets of time periods;

the at least one display row is driven with the first modified orthonormal function during the first set of time periods and with the second modified orthonormal function during the second set of time periods; and

transforming circuitry for transforming a first subset of the image data utilizing the plurality of orthonormal functions to generate a first set of column voltages used to drive columns of the display during the first set of time periods, and for transforming a second subset of the image data utilizing the plurality of orthonormal functions to generate a second set of column voltages used to drive the columns of the display during the second set of time periods, wherein a portion of the image data is included in both the first and second subsets thereof such that the portion is transformed twice using the plurality of orthonormal functions.

7. The electronic device according to claim 6, further comprising a memory for storing the plurality of orthonormal functions.

8. The electronic device according to claim 6, wherein:

the first modified orthonormal function is generated by dividing in half coefficients of a first orthonormal function included in the plurality of orthonormal functions; and

the second modified orthonormal function is generated by dividing in half coefficients of a second orthonormal function included in the plurality of orthonormal functions.

9. The electronic device according to claim 8, wherein the first driving means comprises:

dividing means for dividing in half the coefficients of the first orthonormal function to generate the first modified orthonormal function; and

row drivers for driving the first plurality of rows with a set of voltages associated with the plurality of orthonormal functions, including the first modified orthonormal function, wherein the at least one display row, which is driven during both the first and second sets of time periods, is driven with a subset of voltages which is included in the set of voltages and associated with the first modified orthonormal function during the first set of time periods.

10. The electronic device according to claim 8, wherein the second driving means comprises:

dividing means for dividing in half the coefficients of the second orthonormal function to generate the second modified orthonormal function; and

row drivers for driving the second plurality of rows with a set of voltages associated with the plurality of orthonormal functions, including the second modified orthonormal function, wherein the at least one display row, which is driven during both the first and second sets of time periods, is driven with a subset of voltages included in the set of voltages and associated with the second modified orthonormal function during the Second Set of time periods.

11. The electronic device according to claim 6, further comprising:

column drivers coupled to the transforming circuitry for driving the columns of the display with the first set of column voltages during the first set of time periods and for driving the columns of the display with the second set of column voltages during the second set of time periods.

12. The electronic device according to claim 11, wherein:

the electronic device is a radio communication device for receiving a radio frequency signal which includes the image data, the radio communication device including

a decoder coupled to the receiver for recovering the image data from the radio frequency signal.

13. An electronic device comprising a display for presenting data, the display having columns and having at least first and second display segments comprising, respectively, first and second pluralities of rows, the electronic device comprising:

a receiver for receiving image data;

storing means for storing orthonormal functions;

dividing means coupled to the storing means for dividing in half coefficients of a first orthonormal function, thereby generating a first set of modified orthonormal functions, and for dividing in half coefficients of a second orthonormal function, thereby generating a second set of modified orthonormal functions;

row voltage generating means coupled to the dividing means for generating from the first set of modified orthonormal functions a first set of row voltages for driving the first display segment during a first set of time periods, and for generating from the second set of modified orthonormal functions a second set of row voltages for driving the second display segment during a second set of time periods, wherein;

at least one display row included in the second display segment is also included in the first display segment such that the at least one display row is driven during both the first and second sets of time periods; and

transforming circuitry for transforming a first subset of the image data using the orthonormal functions to generate a first set of column voltages used to drive the columns during the first set of time periods, and for transforming a second subset of the image data using the orthonormal functions to generate a second set of column voltages used to drive the columns during the second set of time periods, wherein a portion of the image data that is included in both the first and second subsets thereof is transformed twice by the orthonormal functions.

14. The electronic device according to claim 13, wherein the storing means comprises a memory, and the dividing means comprises a controller.

15. The electronic device according to claim 13, further comprising row drivers including:

the row voltage generating means;

first row driving means coupled to the row voltage generating means for applying the first set of row voltages to the first display segment during the first set of time periods; and

second row driving means coupled to the row voltage generating means for applying the second set of row voltages to the second display segment during the second set of time periods.

16. The electronic device according to claim 13, wherein:

the electronic device is a radio communication device which further comprises a decoder coupled to the receiver for recovering the image data from a radio frequency signal received by the radio communication device.

17. The electronic device according to claim 13, further comprising:

column drivers coupled to the transforming circuitry for driving the columns of the display with the first set of column voltages during the first set of time periods and for driving the columns of the display with the second set of column voltages during the second set of time periods.