Display driver and method for driving an emissive video display

• US 20050024301A1
• Filed: 08/27/2004
• Published: 02/03/2005
• Est. Priority Date: 05/03/2001
• Status: Abandoned Application

• Current Assignee: David L. Funston
• Original Assignee: David L. Funston
• Inventors: Funston, David L.
• Application Number:
  US10/928,361
• Publication Number:
  US 20050024301A1
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2310/0259 with use of an analog or digital ramp generator in the column driver or in the pixel circuit
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]

Abstract

Methods and control systems are provided for displaying an image electronically encoded in the form of illumination values using a two-dimensional matrix of image elements, each element adapted to covert energy to emit the light when an illumination value is written thereto. In accordance with one method, an array of elements including less than all of the elements in the matrix are defined to display the image so that the amount of energy consumed by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would consume in displaying the image using all of the elements of the matrix.

Claims

1. A method for displaying an image electronically encoded in the form of illumination values using a two-dimensional matrix of image elements, each element adapted to convert energy to emit light when an illumination value is written thereto, the method comprising the steps of:

a) defining an array of elements including less than all of the elements in the matrix to display the image so that the amount of energy consumed by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would consume in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing illumination values for the elements in the array; and

c) generating a sweep signal having the illumination values for the elements in the array wherein the sweep signal writes illumination values for the elements in the array at the determined pixel rate.

2. The method of claim 1, wherein step a) comprises defining the elements in the array also based upon the shape of the image to be displayed by the array.

3. The method of claim 1, wherein step a) comprises defining the elements in the array of elements also based upon the size of the image to be displayed by the array.

4. The method of claim 1, wherein step a) comprises defining the elements in the array based upon image content.

5. The method of claim 1, wherein step a) further comprises the steps of selecting a display mode and defining the elements in the array from among a set of predefined arrays based on the display mode selection.

6. The method of claim 1, wherein step b) further comprises determining the pixel rate for the array to be at least equal to the predefined refresh rate of the elements multiplied by the number of elements in the array.

7. The method of claim 1, wherein step b) comprises determining the pixel rate by reference to a look-up table that matches the number of elements in the array to a pixel rate.

8. A method for displaying an image electronically encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit the light at an intensity that is determined based upon an illumination value written to the element, the method comprising the steps of:

a) defining an array of elements including less than all of the elements in the matrix to display the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing the illumination values for the elements in the array; and

c) generating a sweep signal having the illumination values for the elements in the array with the sweep signal writing illumination values for the elements in the array at the determined pixel rate,

wherein more than one image is to be displayed at the same time wherein the array of elements is defined to display said images.

9. The method of claim 8, wherein the elements in the array of elements are defined based upon the number of images to be displayed.

10. The method of claim 8, wherein the step of determining a pixel rate further comprises determining a sweep rate for each array, and the step of generating a sweep signal comprises generating more than one sweep signal, with each sweep signal writing illumination values for the elements in each array at a rate that is at least equal to the pixel rate for that array.

11. The method of claim 8, wherein the sweep signal is at least the number of elements in all of the arrays multiplied by the refresh rate of the elements, and the step of generating a sweep signal comprises generating a sweep signal that writes illumination values to the elements of all of the arrays.

12. A method for displaying an image electronically encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, the method of comprising the steps of:

a) defining an array of elements including less than all of the elements in the matrix to display the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing the illumination values to the elements in the array; and

c) generating a sweep signal having the illumination values for the elements in the array with the sweep signal writing illumination values for the elements in the array at the determined pixel rate,

wherein the elements of the display are operated by separately enabled energy consuming row and column drivers and further comprising the step of enabling less than all of the drivers while still enabling at least those drivers necessary to operate the elements in the array, so that the amount of energy consumed by the operation of the drivers is less than the amount of energy consumed when all of the drivers are enabled.

13. The method of claim 12, wherein the step of defining the array further comprises defining the array to reduce the number of drivers that are necessary to operate the elements in each array.

14. A method for displaying an image electronically encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, the method of comprising the steps of:

a) defining illumination values representing the image;

b) defining an array of elements including less than all of the elements in the matrix to display the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

c) determining a pixel rate for writing the illumination values to the elements in the array;

d) determining a horizontal sweep rate for writing illumination values into the array;

e) combining illumination values into scan lines associated with the horizontal rows of the array; and

f) writing a sweep signal having illumination values for each of the elements in the array so that each scan line is written at the determined horizontal sweep rate and each illumination value is written at the determined pixel rate, wherein the sweep rate and horizontal pixel rate are determined as a function of the number of elements in the array.

15. A method for displaying an image electronically encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element to display images, the method of comprising the steps of:

a) defining illumination values representing the image;

b) defining an array of elements including less than all of the elements in the matrix to display the image so that the amount of energy consumed by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would consume in displaying the image using all of the elements of the matrix;

c) determining a pixel rate for writing the illumination values to the elements in the array;

d) determining a horizontal sweep rate for writing illumination values into the array;

e) combining illumination values into scan lines associated with the horizontal rows of the array; and

f) writing a sweep signal having illumination values for each of the elements in the array so that each scan line is written at the determined horizontal sweep rate and each illumination value is written at the determined pixel rate, wherein the pixel rate is at least equal to a predefined refresh rate multiplied by the number of elements in the array.

16. A method for displaying images that are encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, the method comprising the steps of:

a) defining an array of elements including less than all of the elements of the matrix to display the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing the illumination values to the elements in the array;

c) determining a horizontal sweep rate for writing illumination values into the array;

d) combining illumination values into scan lines associated with the horizontal rows of the array; and

e) writing a sweep signal having illumination values for each of the elements in the array so that each scan line is written at the horizontal sweep rate and each illumination value is written at the pixel rate wherein the pixel rate and horizontal sweep rate are determined as a function of the number of elements in the array.

17. A method for displaying images that are encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, the method comprising the steps of:

a) defining an array of elements including less than all of the elements of the matrix to display the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing the illumination values to the elements in the array;

c) determining a horizontal sweep rate for writing illumination values into the array;

d) combining illumination values into scan lines associated with the horizontal rows of the array; and

e) writing a sweep signal having illumination values for each of the elements in the array so that each scan line is written at the horizontal sweep rate and each illumination value is written at the pixel rate wherein the pixel rate is at least equal to a predefined refresh rate multiplied by the number of elements in the array.

18. The method of claim 17, wherein the step of defining a set of horizontal rows for displaying the image further comprises defining a number of rows based upon the shape of the image.

19. The method of claim 17, wherein the step of defining a set of horizontal rows for displaying the image further comprises defining a number of rows based upon the size of the image.

20. A method for displaying an image encoded in the form of illumination values using a matrix display of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element organized into a vertical array of horizontal rows, the method comprising the steps of:

a) defining a set of horizontal rows shaving fewer than the total number of horizontal rows in the display for displaying the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing illumination values for the image to the elements in the defined set of horizontal rows;

c) generating a sweep signal to write illumination values to the elements in each row in the set of horizontal rows; and

d) writing the sweep signal to the elements in the array at the determined pixel rate, wherein more than one image is to be displayed and wherein the step of defining a set of horizontal rows for displaying the images comprises determining an arrangement of the images for displaying the images using one set of horizontal rows wherein the display is operated by separately enabled energy consuming row drivers and further comprising the step of selectively enabling less than all of the row drivers while also enabling at least those row drivers associated with the set of horizontal rows so that the amount of energy consumed by the operation of the row drivers is less than the amount of energy consumed when all of the row drivers are enabled.

21. A method for displaying an image encoded in the form of illumination values using a matrix display of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, said elements being organized into a vertical array of horizontal rows to display the method comprising the steps of:

a) defining a set of horizontal rows shaving fewer than the total number of horizontal rows in the display for displaying the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing illumination values for the image to the elements in the defined set of horizontal rows;

c) generating a sweep signal to write illumination values to the elements in each row in the set of horizontal rows; and

d) writing the sweep signal to the elements in the array at the determined pixel rate, wherein more than one image is to be displayed and wherein the step of defining a set of horizontal rows for displaying the images comprises determining an arrangement of the images for displaying the images using one set of horizontal rows wherein the elements of the display are operated by separately enabled energy consuming row drivers and further comprising the step of enabling less than all of the drivers while also enabling at least those drivers that are necessary to operate the elements in each set of rows so that the amount of energy consumed by the operation of the row drivers is less than the amount of energy consumed when all of the row drivers are enabled.

22. A method for displaying an image electronically encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, the method comprising the steps of:

a) defining an array of elements including less than all of the elements in the matrix to display the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing the illumination values for the elements in the array; and

c) generating a sweep signal having the illumination values for the elements in the array with the sweep signal writing illumination values for the elements in the array at the determined pixel rate,

wherein more than one image is to be displayed at the same time and wherein one array of elements is defined to display each one of said images.

23. The method of claim 22, wherein the pixel rate for said one set of horizontal rows is at least equal to the refresh rate for the elements multiplied by the number of elements in said one set of horizontal rows and wherein the step of generating a sweep signal comprises combining the illumination values for each image to form composite scan lines.

25. A method for displaying an image encoded in the form of illumination values using a matrix display of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, said elements being organized into a vertical array of horizontal rows, the method comprising the steps of:

a) defining a set of horizontal rows having fewer than the total number of horizontal rows in the display for displaying the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

b) determining a pixel rate for writing illumination values for the image to the elements in the defined set of horizontal rows;

c) generating a sweep signal that writes illumination values to the elements in each row in the set of horizontal rows; and

d) writing a sweep signal having illumination values to the elements in the array at the determined pixel rate,

wherein more than one image is to be displayed and wherein the step of defining a set of horizontal rows for displaying the images comprises defining more than one set of horizontal rows, with at least one image displayed in each set of rows and wherein the step of generating a sweep signal comprises defining one sweep signal for each set of horizontal rows, wherein said display is operated by separately enabled row drivers and further comprising the step of selectively enabling less than all of the row drivers while also enabling at least those row drivers associated with the set of horizontal rows so that the amount of energy consumed by the operation of the row drivers is less than the amount of energy consumed when all of the row drivers are enabled.

24. The method of claim 25, wherein the step of generating a sweep signal comprises defining a horizontal sweep rate for each sweep signal, and each horizontal sweep rates is at least equal to the pixel rate multiplied by the number of elements in each row of the defined set of horizontal rows.

26. The method of claim 25, wherein the elements of the display are operated by separately enabled row drivers and further comprising the step of enabling less than all of the drivers while also enabling at least those drivers necessary to operate the elements in each set of rows.

29. A display driver for displaying an image encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, the driver comprising:

a) an image source; and

b) a controller receiving the image from the image source, said controller being adapted to;

(1) define an array of elements comprising fewer than all of the elements in the matrix for display of the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

(2) determine a pixel rate for writing illumination values to the array of elements; and

(3) generate images by writing illumination values to the elements in the array at the sweep rate wherein the controller is further adapted to define the elements in the array based upon the image content.

27. The display driver of claim 29, wherein the controller is further adapted to define the elements in the array based upon the size of the image.

28. The display driver of claim 29, wherein the controller is further adapted to define the elements in the array based upon the shape of the image.

30. The display driver of claim 29, further comprising a mode selection input, wherein the controller is adapted to define the elements in the array based upon the status of the mode selecting input.

31. The display driver of claim 29, wherein the pixel rate is at least equal to a predefined refresh rate multiplied by the number of elements in the array.

32. The display driver of claim 29, wherein the horizontal sweep rate is at least equal to the number of elements in each row multiplied by the refresh rate multiplied by the number of rows in the array.

33. The display driver of claim 29, further comprising separately enabled row drivers receiving the illumination values and operating the elements of the display in response to the illumination values wherein the controller enables less than all of the row drivers while still enabling at least those row drivers that are necessary to display the image.

34. The display driver of claim 29, further comprising separately enabled row drivers and column drivers receiving the illumination values and operating the elements of the display in response to the illumination values and for controlling the operation of the elements of the matrix wherein the controller enables less than all of the drivers while also enabling at least those row and column drivers necessary to operate the elements in each array, so that the amount of energy consumed by the operation of the row drivers is less than the amount of energy consumed when all of the row drivers are enabled.

35. A display driver for displaying more than the one image encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, the driver comprising:

a) an image source; and

b) a controller receiving the image from the image source, said controller being adapted to;

(1) define an array of elements comprising fewer than all of the elements in the matrix for display of the image so that the amount of energy converted by the elements of the matrix when displaying an image using the elements of the array is lower than the amount of energy that the elements of the matrix would convert in displaying the image using all of the elements of the matrix;

(2) determine a pixel rate for writing illumination values to the array of elements; and

(3) generate images by writing illumination values to the elements in the array at the pixel rate, wherein more than one image is to be displayed at the same time and the controller defines at least one array of elements for displaying the images.

36. The display driver of claim 35, wherein the controller defines more than one array of elements and one sweep rate for writing illumination instructions to each array of elements with each sweep rate being at least equal to a predefined refresh rate multiplied by the number of elements in each array.

37. A display driver for displaying more than the one image encoded in the form of illumination values using a two-dimensional matrix of elements, each element adapted to convert energy to emit light at an intensity that is determined based upon an illumination value written to the element, the driver comprising:

a) an image source; and

b) a controller receiving the image from the image source, said controller being adapted to;

(1) define an array of elements comprising fewer than all of the elements in the matrix for display of the image;

(2) determine a pixel rate for writing illumination values to the array of elements; and

(3) generate images by writing illumination values to the elements in the array at the pixel rate, wherein more than one image is to be displayed and the controller defines at least one array of elements for displaying the images, further comprising separately enabled row drivers receiving the illumination values and operating the elements of the display in response to the illumination values wherein the controller enables less than all of the row drivers while still enabling at least those row drivers that are necessary to display the image.