Ambient light adaptive displays with paper-like appearance
First Claim
1. A method for displaying images on a display having an adjustable white point, comprising:
- with a color-sensitive light sensor, determining a color and an intensity of ambient light;
with display control circuitry, determining whether the intensity of ambient light is above or below a threshold;
with the display control circuitry, operating the display in a first mode in response to determining that the intensity of ambient light is below the threshold, wherein operating the display in the first mode comprises automatically adjusting the white point of the display to a preset low light mode white point that is not adapted to the color of the ambient light; and
with the display control circuitry, operating the display in a second mode in response to determining that the intensity of ambient light is above the threshold, wherein operating the display in the second mode comprises automatically adjusting the white point of the display based on the color of ambient light, and wherein the display control circuitry shifts the display from the second mode to the first mode when the intensity of ambient light drops from above the threshold to below the threshold.
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Abstract
An electronic device may include a display having an array of display pixels and having display control circuitry that controls the operation of the display. The display control circuitry may operate the display in different modes. In a paper mode, display control circuitry may use stored spectral reflectance data to adjust display colors such that the colors appear as they would on a printed sheet of paper. In a low light mode when the ambient light level is below a threshold, the light emitted from the display may be adjusted to mimic the appearance of an incandescent light source. In a bright light mode when the ambient light level exceeds a threshold, the light emitted from the display may be adjusted to maximize readability in bright light. The target white point of the display may be adjusted based on which mode the display is operating in.
71 Citations
17 Claims
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1. A method for displaying images on a display having an adjustable white point, comprising:
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with a color-sensitive light sensor, determining a color and an intensity of ambient light; with display control circuitry, determining whether the intensity of ambient light is above or below a threshold; with the display control circuitry, operating the display in a first mode in response to determining that the intensity of ambient light is below the threshold, wherein operating the display in the first mode comprises automatically adjusting the white point of the display to a preset low light mode white point that is not adapted to the color of the ambient light; and with the display control circuitry, operating the display in a second mode in response to determining that the intensity of ambient light is above the threshold, wherein operating the display in the second mode comprises automatically adjusting the white point of the display based on the color of ambient light, and wherein the display control circuitry shifts the display from the second mode to the first mode when the intensity of ambient light drops from above the threshold to below the threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electronic device, comprising:
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a display that displays colors; a light sensor that measures a color and an intensity of ambient light; and display control circuitry that determines whether the intensity of ambient light is above or below a threshold, wherein the display control circuitry operates the display in a first mode in response to determining that the intensity of ambient light is below the threshold and operates the display in a second mode in response to determining that the intensity of ambient light is above the threshold, wherein the colors on the display mimic an appearance of the colors on paper when the display is operated in the second mode, wherein the colors do not mimic the appearance of the colors on paper when the display is operated in the first mode, wherein in the first mode the display control circuitry automatically adjusts a white point of the display to a preset low light mode white point in response to determining that the intensity of ambient light is below the threshold, wherein the preset low light mode white point is not adapted to the color of the ambient light, and wherein the display control circuitry shifts the display from the second mode to the first mode when the intensity of ambient light drops from above the threshold to below the threshold. - View Dependent Claims (9, 10, 11, 12)
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13. A method for displaying images on a display having an adjustable white point, comprising:
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with a light sensor, measuring a color and brightness of ambient light; with display control circuitry, determining whether the brightness of ambient light is above or below a threshold; in response to determining that the brightness of ambient light is below the threshold, operating the display in a first mode by automatically adjusting the white point of the display to a first white point color, wherein the first white point color is preset and is not adapted to the color of ambient light; and in response to determining that the brightness of ambient light is above the threshold, operating the display in a second mode by automatically adjusting the white point of the display to a second white point color, wherein the second white point color is adapted to the color of ambient light, wherein the first white point color is less blue than the second white point color, and wherein the display control circuitry shifts the display from the second mode to the first mode when the brightness of ambient light drops from above the threshold to below the threshold. - View Dependent Claims (14, 15, 16, 17)
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Specification