# US 2013/0155090 A1 · Static image power management

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- Number: US 2013/0155090 A1
- Document ID: US20130155090A1
- Status: Published application
- Kind: A1
- Application number: 13/326,065
- Filed: 2011-12-14
- Published: 2013-06-20
- Earliest claimed: 2011-12-14
- Assignees: QUALCOMM Incorporated
- Inventors: Fariborz Pourbigharaz; Carl Kazumi Mizuyabu; Khosro M. Rabii; John Chi Kit Wong; Gary Arthur Ciambella; Chia-Yuan Teng; Tauseef Kazi
- Web page: https://patentgrep.com/patent/US20130155090A1

## CPC

- G06F 1/3265: {Power saving in display device}
- G06F 1/3218: of display devices
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- Y02D 30/50: in wire-line communication networks, e.g. low power modes or reduced link rate
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

This disclosure describes techniques for reducing power consumption of a display device. According to these techniques, a display device is configured to determine whether an image to be displayed by the display device has become static. In response to identifying such a static image, the display device may operate in a static image mode. According to the static image mode, the display device may read a current frame of image data, modify the current frame of image data to generate a modified frame of image data with a reduced size, and store the modified image data in memory. The display device may read the modified image data from memory to present the static image, which may reduce power consumption of the display device.

## Claims

### Claim 1

A method comprising:
operating a display device in a standard mode to display images;
comparing a current frame of image data to at least one previous frame of image data;
determining that the current frame of image data comprises a static image based on the comparison;
responsive to determining that the current frame of image data comprises a static image, modifying the current frame of image data to generate a modified frame of image data;
storing the modified frame of image data in a memory; and
operating the display device in a static image mode, wherein the static image mode comprises reading the modified frame of image data from the memory to present the static image.

### Claim 2 (depends on 1)

The method of claim 1, wherein operating the display device in the static image mode further comprises:
reducing a clock rate of at least one component of the display device relative to a clock rate of the at least one component in standard mode of operation.

### Claim 3 (depends on 1)

The method of claim 1, wherein operating the display device in the static image mode further comprises:
reducing a voltage level of at least one component of the display device relative to a voltage level of the at least one component in the standard mode of operation.

### Claim 4 (depends on 1)

The method of claim 1, wherein modifying the current frame of image data to generate the modified frame of image data comprises generating the modified frame of image data to have less data than the current frame of image data.

### Claim 5 (depends on 4)

The method of claim 4, further comprising:
reading the modified frame from memory until another frame of image data different than the current frame is to be displayed.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
modifying the current frame of image data to generate the modified frame of image data only once in response to determining that the current frame of image data comprises a static image based on the comparison.

### Claim 7 (depends on 1)

The method of claim 1, wherein modifying the current frame to generate the modified frame comprises reducing a number of bits that represent the static image.

### Claim 8 (depends on 7)

The method of claim 7, wherein reducing the number of bits that represent the static image comprises reducing a number of bits per pixel of modified frame relative to the current frame.

### Claim 9 (depends on 8)

The method of claim 8, wherein reducing the number of bits that represent the static image comprises converting the current frame from red green blue (RGB) color space to luminance and chrominance components.

### Claim 10 (depends on 7)

The method of claim 7, wherein reducing the number of bits that represent the static image comprises entropy encoding the current frame.

### Claim 11 (depends on 1)

The method of claim 1, wherein the current frame comprises a plurality of image surfaces, and wherein modifying the current frame of image data to generate a modified frame of image data comprises combining the plurality of image surfaces into a single surface of image data.

### Claim 12

A display device, comprising:
a static image module, comprising:
a static image determination module configured to:
compare a current frame of image data to at least one previous frame of image data, and determine that the current frame of image data comprises a static image based on the comparison; and
a static mode module configured to:
responsive to determining that the current frame of image data comprises a static image, modify the current frame of image data to generate a modified frame of image data;
store the modified frame of image data in a memory; and
operate the display device in a static image mode, wherein the static image mode comprises reading the modified frame of image data from the memory to present the static image.

### Claim 13 (depends on 12)

The device of claim 12, wherein, in the static image mode, the static mode module is configured to:
reduce a clock rate of at least one component of the display device relative to a clock rate of the at least one component in standard mode of operation.

### Claim 14 (depends on 12)

The device of claim 12, wherein, in the static image mode, the static mode module is configured to:
reduce a voltage level of at least one component of the display device relative to a voltage level of the at least one component in the standard mode of operation.

### Claim 15 (depends on 12)

The device of claim 12, wherein the static image module is configured to generate the modified frame of image data to have less data than the current frame of image data.

### Claim 16 (depends on 15)

The device of claim 15, wherein the static image module is configured to cause the display device to:
read the modified frame from memory until another frame of image data different than the current frame is to be displayed.

### Claim 17 (depends on 12)

The device of claim 12, wherein the static image mode module is configured to:
modify the current frame of image data to generate the modified frame of image data only once in response to determining that the current frame of image data comprises a static image based on the comparison.

### Claim 18 (depends on 12)

The device of claim 12, wherein the static mode module is configured to generate the modified frame by reducing a number of bits that represent the static image.

### Claim 19 (depends on 18)

The device of claim 18, wherein the static mode module is configured to reduce a number of bits per pixel of modified frame relative to the current frame.

### Claim 20 (depends on 19)

The device of claim 19, wherein the static mode module is configured to convert the current frame from red green blue (RGB) color space to luminance and chrominance components.

### Claim 21 (depends on 18)

The device of claim 18, wherein the static mode module is configured to entropy encode the current frame.

### Claim 22 (depends on 12)

The device of claim 12, wherein the current frame comprises a plurality of image surfaces, and wherein the static mode module is configured to generate a modified frame of image data by combining the plurality of image surfaces into a single surface of image data.

### Claim 23

A display device, comprising:
means for operating a display device in a standard mode to display images;
means for comparing a current frame of image data to at least one previous frame of image data;
means for determining that the current frame of image data comprises a static image based on the comparison;
means for, responsive to determining that the current frame of image data comprises a static image, modifying the current frame of image data to generate a modified frame of image data;
means for storing the modified frame of image data in a memory; and
means for operating the display device in a static image mode, wherein the static image mode comprises reading the modified frame of image data from the memory to present the static image.

### Claim 24 (depends on 23)

The device of claim 23, further comprising:
means for reducing a clock rate of at least one component of the display device relative to a clock rate of the at least one component in standard mode of operation.

### Claim 25 (depends on 23)

The device of claim 23, further comprising:
means for reducing a voltage level of at least one component of the display device relative to a voltage level of the at least one component in the standard mode of operation.

### Claim 26 (depends on 23)

The device of claim 23, further comprising:
means for generating the modified frame of image data to have less data than the current frame of image data.

### Claim 27 (depends on 26)

The device of claim 26, further comprising:
means for reading the modified frame from memory until another frame of image data different than the current frame is to be displayed.

### Claim 28 (depends on 23)

The device of claim 23, further comprising:
means for modifying the current frame of image data to generate the modified frame of image data only once in response to determining that the current frame of image data comprises a static image based on the comparison.

### Claim 29 (depends on 23)

The device of claim 23, wherein the means for modifying the current frame to generate the modified frame to include a reduced number of bits that represent the static image.

### Claim 30 (depends on 29)

The device of claim 29, further comprising:
means for reducing a number of bits per pixel of modified frame relative to the current frame.

### Claim 31 (depends on 30)

The device of claim 30, further comprising:
means for converting the current frame from red green blue (RGB) color space to luminance and chrominance components.

### Claim 32 (depends on 29)

The device of claim 29, further comprising:
means for entropy encoding the current frame.

### Claim 33 (depends on 23)

The device of claim 23, wherein the current frame comprises a plurality of image surfaces, and further comprising:
means for combining the plurality of image surfaces into a single surface of image data to generate the modified frame.

### Claim 34

A computer-readable storage medium that stores instructions configured to cause a computing device to:
operate a display device in a standard mode to display images;
compare a current frame of image data to at least one previous frame of image data;
determine that the current frame of image data comprises a static image based on the comparison;
responsive to determining that the current frame of image data comprises a static image, modify the current frame of image data to generate a modified frame of image data;
store the modified frame of image data in a memory; and
operate the display device in a static image mode, wherein the static image mode comprises reading the modified frame of image data from the memory to present the static image.

### Claim 35 (depends on 34)

The computer-readable storage medium of claim 34, wherein the instructions further cause the computing device to:
in the static image mode, reduce a clock rate of at least one component of the display device relative to a clock rate of the at least one component in standard mode of operation.

### Claim 36 (depends on 34)

The computer-readable storage medium of claim 34, wherein the instructions further cause the computing device to:
in the static image mode, reduce a voltage level of at least one component of the display device relative to a voltage level of the at least one component in the standard mode of operation.

### Claim 37 (depends on 34)

The computer-readable storage medium of claim 34, wherein the instructions further cause the computing device to:
generate the modified frame of image data to have less data than the current frame of image data.

### Claim 38 (depends on 34)

The computer-readable storage medium of claim 34, wherein the instructions further cause the computing device to:
read the modified frame from memory until another frame of image data different than the current frame is to be displayed.

### Claim 39 (depends on 34)

The computer-readable storage medium of claim 34, wherein the instructions further cause the computing device to:
modify the current frame of image data to generate the modified frame of image data only once in response to determining that the current frame of image data comprises a static image based on the comparison.

### Claim 40 (depends on 34)

The computer-readable storage medium of claim 34, wherein the instructions further cause the computing device to:
generate the modified frame by reducing a number of bits that represent the static image.

### Claim 41 (depends on 40)

The computer-readable storage medium of claim 40, wherein the instructions further cause the computing device to:
reduce a number of bits per pixel of modified frame relative to the current frame.

### Claim 42 (depends on 41)

The computer-readable storage medium of claim 41, wherein the instructions further cause the computing device to:
convert the current frame from red green blue (RGB) color space to luminance and chrominance components.

### Claim 43 (depends on 42)

The computer-readable storage medium of claim 42, wherein the instructions further cause the computing device to:
entropy encode the current frame.

### Claim 44 (depends on 40)

The computer-readable storage medium of claim 40, wherein the current frame comprises a plurality of image surfaces, and wherein the instructions further cause the computing device to:
generate a modified frame of image data by combining the plurality of image surfaces into a single surface of image data.