METHODS AND DEVICES FOR DRIVING A DISPLAY USING BOTH AN ACTIVE MATRIX ADDRESSING SCHEME AND A PASSIVE MATRIX ADDRESSING SCHEME

• US 20130021309A1
• Filed: 07/22/2011
• Published: 01/24/2013
• Est. Priority Date: 07/22/2011
• Status: Abandoned Application

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Kothari, Manish, Govil, Alok
• Application Number:
  US13/189,425
• Publication Number:
  US 20130021309A1
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 2310/0202 Addressing of scan or signal lines
• CPC Class Codes: G09G 2310/0205 Simultaneous scanning of several lines in flat panels
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2310/063 Waveforms for resetting the whole screen at once
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3466 based on interferometric effect
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

Methods and devices for updating an array of display elements using both an active matrix addressing scheme and a passive matrix addressing scheme are described herein. In one embodiment, the method comprises selecting between an active matrix addressing scheme and a passive matrix addressing scheme. The method further comprises driving the array of display elements using the selected addressing scheme.

Claims

1. A method of updating an array of display elements, the method comprising:

selecting between an active matrix addressing scheme and a passive matrix addressing scheme; and

driving the array of display elements using the selected addressing scheme.

2. The method of claim 1, further comprising:

addressing the display elements using either the passive matrix addressing scheme or the active matrix addressing scheme; and

maintaining a state of each of the display elements using the passive matrix addressing scheme.

3. The method of claim 1, wherein driving the array of display elements using the passive matrix addressing scheme comprises deactivating one or more active matrix circuit elements each associated with one of the display elements.

4. The method of claim 3, wherein each active matrix circuit element includes a switch that selectively couples its associated display element to one of a plurality of voltage lines, and wherein deactivating one or more active matrix circuit elements comprises closing one or more switches and coupling the associated display elements to their respective voltage lines.

5. The method of claim 1, wherein driving the array of display elements using the passive matrix addressing scheme comprises applying a voltage within a hysteresis window to each of the display elements at one time.

6. The method of claim 1, wherein the array of display elements includes one or more rows of display elements and one or more columns of display elements, wherein each of the one or more columns of display elements is associated with a respective voltage line, and wherein each display element is selectively coupled to its respective voltage line.

7. The method of claim 6, wherein driving the array of display elements using the passive matrix addressing scheme comprises coupling each of the display elements to its respective voltage line at one time.

8. The method of claim 6, wherein driving the array of display elements using the active matrix addressing scheme comprises coupling only the display elements of one row of the one or more rows to their respective voltage lines at one time.

9. The method of claim 6, wherein driving the array of display elements using the active matrix addressing scheme comprises applying a voltage only to the display elements of one row of the one or more rows at one time.

10. The method of claim 1, wherein the array of display elements comprises an array of bi-stable display elements.

11. A display apparatus comprising:

an array of display elements;

a first processing circuit configured to select between an active matrix addressing scheme and a passive matrix addressing scheme; and

a driver configured to drive the array of bi-stable display elements using the selected addressing scheme.

12. The display apparatus of claim 11, wherein the driver is further configured to:

address the display elements using either the passive matrix addressing scheme or the active matrix addressing scheme; and

maintain a state of each of the display elements using the passive matrix addressing scheme.

13. The display apparatus of claim 11, wherein the driver is configured to drive the array of display elements using the passive matrix addressing scheme by deactivating one or more active matrix circuit elements each associated with one of the display elements.

14. The display apparatus of claim 13, wherein each active matrix circuit element includes a switch that selectively couples its associated display element to one of a plurality of voltage lines, and wherein deactivating one or more active matrix circuit elements comprises closing one or more switches and coupling the associated display elements to their respective voltage lines.

15. The display apparatus of claim 11, wherein the passive matrix addressing scheme includes applying a voltage within a hysteresis window to each of the display elements at one time.

16. The display apparatus of claim 11, wherein the array of display elements includes one or more rows of display elements and one or more columns of display elements, wherein each of the one or more columns of display elements is associated with a respective voltage line, and wherein each display element is selectively coupled to its respective voltage line.

17. The display apparatus of claim 16, wherein the passive matrix addressing scheme includes coupling each of the display elements to its respective voltage line at one time.

18. The display apparatus of claim 16, wherein the active matrix addressing scheme includes coupling only the display elements of one row of the one or more rows to their respective voltage lines at one time.

19. The display apparatus of claim 16, wherein the active matrix addressing scheme includes applying a voltage only to the display elements of one row of the one or more rows at one time.

20. The display apparatus of claim 11, wherein the array of display elements includes an array of bi-stable display elements.

21. The apparatus of claim 11, further comprising:

a display;

a processor that is configured to communicate with said display, said processor being configured to process image data; and

a memory device that is configured to communicate with said processor.

22. The apparatus as recited in claim 21, further comprising:

a controller configured to send at least a portion of said image data to said driver.

23. The apparatus as recited in claim 21, further comprising:

an image source module configured to send said image data to said processor.

24. The apparatus as recited in claim 23, wherein said image source module comprises at least one of a receiver, transceiver, and transmitter.

25. The apparatus as recited in claim 21, further comprising:

an input device configured to receive input data and to communicate said input data to said processor.

26. A method of manufacturing a display apparatus, the method comprising:

providing an array of display elements;

providing a first processing circuit configured to select between an active matrix addressing scheme and a passive matrix addressing scheme; and

providing a driver configured to drive the array of bi-stable display elements using the selected addressing scheme.

27. The method of claim 26, wherein the driver is further configured to:

address the display elements using either the passive matrix addressing scheme or the active matrix addressing scheme; and

maintain a state of each of the display elements using the passive matrix addressing scheme.

28. The method of claim 26, wherein the array of display elements comprises an array of bi-stable display elements.

29. A display apparatus comprising:

means for displaying;

means for selecting between an active matrix addressing scheme and a passive matrix addressing scheme; and

means for driving the display means using the selected addressing scheme.

30. The display apparatus of claim 29, wherein the means for driving is further configured to:

address the display elements using either the passive matrix addressing scheme or the active matrix addressing scheme; and

maintain a state of each of the display elements using the passive matrix addressing scheme.

31. The display apparatus of claim 29, wherein the array of display elements includes one or more rows of display elements and one or more columns of display elements, wherein each of the one or more columns of display elements is associated with a respective voltage line, and wherein each display element is selectively coupled to its respective voltage line.

32. A computer-readable medium, comprising instructions that when executed perform a method comprising:

selecting between an active matrix addressing scheme and a passive matrix addressing scheme; and

driving the array of display elements using the selected addressing scheme.

33. The computer-readable medium of claim 32, wherein the method further comprises:

addressing the display elements using either the passive matrix addressing scheme or the active matrix addressing scheme; and

maintaining a state of each of the display elements using the passive matrix addressing scheme.