System and method for power reduction when decompressing video streams for interferometric modulator displays

• US 8,391,630 B2
• Filed: 12/22/2005
• Issued: 03/05/2013
• Est. Priority Date: 12/22/2005
• Status: Expired due to Fees

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Mathew, Mithran
• Primary Examiner(s): Repko, Jason M
• Assistant Examiner(s): Thirugnanam, Gandhi
• Application Number:
  US11/317,421
• Publication Number:
  US 20070147688A1
• Time in Patent Office: 2,630 Days
• Field of Search: 382/260, 382/261, 382/264, 345/211
• US Class Current: 382/264
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/3466 based on interferometric effect

Abstract

A system and method for processing image data to be displayed on a display device, where the display device requires more power to be driven to display image data comprising particular spatial frequencies in one dimension than to be driven to display image data comprising the particular spatial frequencies in a second dimension. The method includes receiving image data and filtering the received image data such that the image data at particular spatial frequencies in a first dimension are attenuated more than the image data at particular spatial frequencies in a second dimension.

Claims

1. A method of displaying data on a display device, the method comprising:

receiving image data having a number of pixels, the image data comprising particular spatial frequencies in a first dimension capable of being displayed on the display device and the particular spatial frequencies in a second dimension capable of being displayed on the display device;

estimating a remaining lifetime of a power supply;

setting filter parameters based on the estimated remaining lifetime of the power supply, wherein values of the filter parameters are increased as the estimated lifetime of the power supply decreases;

filtering the received image data using the filter parameters such that the particular spatial frequencies in the first dimension are smoothed more than the particular spatial frequencies in the second dimension are smoothed; and

displaying the filtered image data on the display device, the filtered image data having the same number of pixels as the received image data.

2. The method of claim 1, wherein the filtering comprises spatial domain filtering.

3. The method of claim 1, wherein the filtering comprises filtering in a transformed domain.

4. The method of claim 3, wherein the received image data is in the transformed domain, the method further comprising:

inverse transforming the filtered image data, thereby resulting in spatial domain image data.

5. The method of claim 1, wherein the filtering comprises low pass filtering wherein lower spatial frequencies remain substantially unchanged after filtering.

6. The method of claim 1, further comprising estimating a power required to drive the display device to display the received image data, wherein the filter parameters are further based on the estimated power required.

7. The method of claim 3, wherein the transformed domain is one of a discrete Fourier transformed domain, a discrete cosine transformed domain, a Hadamard transformed domain, a discrete wavelet transformed domain, a discrete sine transformed domain, a Haar transformed domain, a slant transformed domain, a Karhunen-Loeve transformed domain and an H.264 integer transformed domain.

8. The method of claim 1, further comprising determining that the estimated remaining lifetime of the power supply is below a predetermined threshold, wherein the filter parameters are based on the determining that the estimated remaining lifetime of the power supply is below a predetermined threshold.

9. The method of claim 1, wherein the filtering comprises filtering the received image data primarily in the first dimension.

10. The method of claim 1, wherein the filtering comprises filtering the received image data only in the first dimension.

11. An apparatus for displaying image data, comprising:

a power supply;

a display device capable of displaying image data comprising particular spatial frequencies in a first dimension and the particular spatial frequencies in a second dimension;

a processor configured to receive image data having a number of pixels, the image data comprising the particular spatial frequencies in the first dimension and the particular spatial frequencies in the second dimension, to estimate a remaining lifetime of the power supply, to set filter parameters based on the estimated remaining lifetime of the power supply, and to filter the image data using the filter parameters such that the particular spatial frequencies in the first dimension are smoothed more than the particular spatial frequencies in the second dimension are smoothed, wherein values of the filter parameters are increased as the estimated lifetime of the power supply decreases; and

at least one driver circuit configured to communicate with the processor and to drive the display device, the driver circuit further configured to provide the filtered image data to the display device, the filtered image data having the same number of pixels as the received image data.

12. The apparatus of claim 11, wherein the filtering is done in a spatial domain.

13. The apparatus of claim 11, wherein the filtering is done in a transformed domain.

14. The method of claim 13, wherein the processor is further configured to receive the image data in the transformed domain, and to inverse transform the filtered image data, thereby resulting in the filtered image data being in the spatial domain.

15. The apparatus of claim 11, wherein the processor is further configured to determine if the estimated remaining lifetime of the power supply is below a predetermined threshold and filter the image data based on the determining that the estimated remaining lifetime is below the predetermined threshold.

16. The apparatus of claim 11, wherein the display comprises an array of interferometric modulators.

17. The apparatus of claim 11, wherein the processor is further configured to estimate the power required to drive the display device to display the image data and to set the filter parameters based on the estimated power required.

18. The apparatus of claim 11, wherein the processor is further configured to estimate the power required to drive the display device to display the image data, to determine if the estimated power required is above a threshold and to filter the image data based on the determining that the estimated power required is above the threshold.

19. The apparatus of claim 11, wherein the filtering is done in a transformed domain, and filtering with a second parameter set attenuates lower spatial frequencies in the first dimension more than filtering with a first parameter set.

20. The apparatus of claim 11, wherein the filtering is done in a spatial domain, and filtering with a second parameter set combines more spatial coefficients in the first dimension than filtering with a first parameter set.

21. The apparatus of claim 11, wherein the filtering comprises low pass filtering that results in lower spatial frequencies remaining substantially unchanged after filtering.

22. The apparatus of claim 13, wherein the transformed domain is one of a discrete Fourier transformed domain, a discrete cosine transformed domain, a Hadamard transformed domain, a discrete wavelet transformed domain, a discrete sine transformed domain, a Haar transformed domain, a slant transformed domain, a Karhunen-Loeve transformed domain and an H.264 integer transformed domain.

23. The apparatus of claim 11, further comprising:

a memory device in electrical communication with the processor.

24. The apparatus of claim 23, further comprising a controller configured to send at least a portion of the filtered image data to the driver circuit.

25. The apparatus of claim 23, further comprising an image source module configured to send the image data to the processor.

26. The apparatus of claim 25, wherein the image source module comprises at least one of a receiver, transceiver, and transmitter.

27. The apparatus of claim 23, further comprising an input device configured to receive input data and to communicate the input data to the processor.

28. The apparatus of claim 11, wherein the processor is configured to filter the image data by filtering the image data primarily in the first dimension.

29. The apparatus of claim 11, wherein the processor is configured to filter the image data by filtering the image data only in the first dimension.

30. An apparatus for processing image data, comprising:

means for supplying power;

means for displaying image data comprising particular spatial frequencies in a first dimension and the particular spatial frequencies in a second dimension;

means for receiving image data having a number of pixels, the image data comprising the particular spatial frequencies in the first dimension and the particular spatial frequencies in the second dimension;

means for estimating a remaining lifetime of the means for supplying power;

means for setting filter parameters based on the estimated remaining lifetime of the power supply, wherein values of the filter parameters are increased as the estimated lifetime of the power supply decreases;

means for filtering the received image data using the filter parameters such that the particular spatial frequencies in the first dimension are smoothed more than the particular spatial frequencies in the second dimension are smoothed; and

means for providing the filtered image data to the means for displaying, the filtered image data having the same number of pixels as the received image data.

31. The apparatus of claim 30, wherein the means for receiving comprises a network interface.

32. The apparatus of claim 30, wherein the means for displaying comprises an array of interferometric modulators.

33. The apparatus of claim 30, wherein the means for providing comprises at least one driver circuit.

34. The apparatus of claim 30, wherein the means for filtering filters the image data by filtering the image data primarily in the first dimension.

35. The apparatus of claim 30, wherein the means for filtering filters the image data by filtering the image data only in the first dimension.