Method for automatic backlight adjustment
First Claim
1. A method for automatically adjusting an intensity level of a backlight of a device having a built-in camera comprising:
- a) capturing a first image with the camera and determining an average pixel intensity corresponding to the captured image;
b) adjusting the intensity level of the backlight corresponding to the average pixel intensity of the first captured image;
c) capturing a second image with the camera and calculating an average pixel intensity corresponding to the second captured image;
d) comparing the average pixel intensity of the second captured image to the average pixel intensity of the first captured image; and
e) adjusting the intensity level of the backlight corresponding to a difference between the average pixel intensities of the second captured image and the first captured image.
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Accused Products
Abstract
A method and system for automatically adjusting a backlight intensity level for displays is disclosed. The system and method are implemented in electronic devices having a camera and digital backlit displays, such that the camera is used to determine an ambient light level and the backlight level is adjusted according to the determined ambient light level. In particular, when the camera is not in use for capturing images by the user, the automatic backlight adjustment system captures a first image with the camera to determine an initial ambient light level, and then captures a second image with the camera at a later time to determine a subsequent ambient light level. The subsequent and initial ambient light levels are compared to each other and the backlight intensity level is either increased or decreased a predetermined amount for optimal viewing and low power consumption. Backlight intensity determination can be performed on the basis of a single image instead of a differential between two images.
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Citations
19 Claims
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1. A method for automatically adjusting an intensity level of a backlight of a device having a built-in camera comprising:
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a) capturing a first image with the camera and determining an average pixel intensity corresponding to the captured image;
b) adjusting the intensity level of the backlight corresponding to the average pixel intensity of the first captured image;
c) capturing a second image with the camera and calculating an average pixel intensity corresponding to the second captured image;
d) comparing the average pixel intensity of the second captured image to the average pixel intensity of the first captured image; and
e) adjusting the intensity level of the backlight corresponding to a difference between the average pixel intensities of the second captured image and the first captured image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device having a camera, comprising:
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a camera;
a camera controller for instructing the camera to capture an image and for receiving the captured image from the camera;
a central processor for receiving the captured image and providing a backlight control level corresponding to an average pixel intensity of the captured image;
a keyboard;
an adjustable keyboard backlight for illuminating the keyboard, and a keyboard backlight controller for setting the adjustable keyboard backlight to an intensity corresponding to the backlight control level. - View Dependent Claims (14, 15)
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16. A method for automatically adjusting an intensity level of a backlight of a device having a built-in camera comprising:
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a) capturing a first image with the camera and determining an average pixel intensity corresponding to the captured image; and
b) adjusting the intensity level of the backlight corresponding to the average pixel intensity of the first captured image, wherein a camera pixel active area of the image is set to a preset size before the step of capturing the first image. - View Dependent Claims (17, 18)
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19. A method for automatically adjusting an intensity level of a backlight of a device having a built-in camera comprising:
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a) capturing a first image with the camera and determining an average pixel intensity corresponding to the captured image; and
b) adjusting the intensity level of the backlight corresponding to the average pixel intensity of the first captured image, wherein the step of adjusting includes setting a fine backlight intensity level.
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Specification