Luminescence shock avoidance in display devices
First Claim
1. A method for avoiding luminescence shock in a display device when a previously dark display device is suddenly illuminated, comprising:
- detecting a current ambient light level at the display device at a time at which the display device is in a dark state;
if the detected ambient light level is below a luminescence shock threshold established at the display device,turning on the display device from the dark state to a reduced brightness level as compared to the brightness level normally appropriate for the detected current ambient light level as dictated by a brightness function established by the display device, the brightness function representing a display brightness level at the display device for a given ambient light level, andafter a predetermined time interval has elapsed, ramping up the brightness level from the reduced brightness level to the brightness level dictated by the brightness function and the detected ambient light level; and
if the detected ambient light level is at or above the luminescence shock threshold, turning on the display device from the dark state to the brightness level appropriate for the detected ambient light level as dictated by the brightness function.
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Abstract
A luminescence shock avoidance algorithm selectively limits the brightness level of a display device when the display device is activated in a dark environment to prevent the temporary vision impairment that can occur when a display device is activated in a dark environment. The algorithm receives the state of the display (e.g. on or in standby mode), and can optionally receive an ambient lighting value from an ambient light sensor and a user-selectable manual brightness adjustment setting to determine whether luminescence shock avoidance should even be triggered, and if it is triggered, how much should the brightness level of the display be limited.
48 Citations
31 Claims
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1. A method for avoiding luminescence shock in a display device when a previously dark display device is suddenly illuminated, comprising:
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detecting a current ambient light level at the display device at a time at which the display device is in a dark state; if the detected ambient light level is below a luminescence shock threshold established at the display device, turning on the display device from the dark state to a reduced brightness level as compared to the brightness level normally appropriate for the detected current ambient light level as dictated by a brightness function established by the display device, the brightness function representing a display brightness level at the display device for a given ambient light level, and after a predetermined time interval has elapsed, ramping up the brightness level from the reduced brightness level to the brightness level dictated by the brightness function and the detected ambient light level; and if the detected ambient light level is at or above the luminescence shock threshold, turning on the display device from the dark state to the brightness level appropriate for the detected ambient light level as dictated by the brightness function. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer-readable medium comprising program code for avoiding luminescence shock in a display device when a previously dark display device is suddenly illuminated, the program code for causing performance of a method comprising:
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detecting a current ambient light level at the display device at a time at which the display device is in a dark state; if the detected ambient light level is below a luminescence shock threshold, turning on the display device from the dark state to a reduced brightness level as compared to the brightness level normally appropriate for the detected current ambient light level as dictated by a brightness function, the brightness function representing a display brightness level for a given ambient light level, and after a predetermined time interval has elapsed, ramping up the brightness level from the reduced brightness level to the brightness level dictated by the brightness function and the detected ambient light level; and if the detected ambient light level is at or above the luminescence shock threshold, turning on the display device from the dark state to the brightness level appropriate for the detected ambient light level as dictated by the brightness function. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for avoiding luminescence shock in a display device when a previously dark display device is suddenly illuminated, comprising:
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an ambient light sensor configured for detecting a current ambient light level at the display device at a time at which the display device is in a dark state; and a processor coupled to the ambient light sensor and programmed for, if the detected ambient light level is below a luminescence shock threshold, turning on the display device from the dark state to a reduced brightness level as compared to the brightness level normally appropriate for the detected current ambient light level as dictated by a brightness function, the brightness function representing a display brightness level for a given ambient light level, and after a predetermined time interval has elapsed, ramping up the brightness level from the reduced brightness level to the brightness level dictated by the brightness function and the detected ambient light level; and wherein the processor is further programmed for, if the detected ambient light level is at or above the luminescence shock threshold, turning on the display device from the dark state to the brightness level appropriate for the detected ambient light level as dictated by the brightness function. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus for avoiding luminescence shock in a display device when a previously dark display device is suddenly illuminated, comprising:
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means for detecting a current ambient light level at the display device at a time at which the display device is in a dark state; means for, if the detected ambient light level is below a luminescence shock threshold, turning on the display device from the dark state to a reduced brightness level as compared to the brightness level normally appropriate for the detected current ambient light level as dictated by a brightness function, the brightness function representing a display brightness level for a given ambient light level, and after a predetermined time interval has elapsed, ramping up the brightness level from the reduced brightness level to the brightness level dictated by the brightness function and the detected ambient light level; and means for, if the detected ambient light level is at or above the luminescence shock threshold, turning on the display device from the dark state to the brightness level appropriate for the detected ambient light level as dictated by the brightness function.
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30. A mobile telephone including a computer-readable medium comprising program code for avoiding luminescence shock in a display device when a previously dark display device is suddenly illuminated, the program code for causing performance of a method comprising:
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detecting a current ambient light level at the display device at a time at which the display device is in a dark state; if the detected ambient light level is below a luminescence shock threshold, turning on the display device from the dark state to a reduced brightness level as compared to the brightness level normally appropriate for the detected current ambient light level as dictated by a brightness function, the brightness function representing a display brightness level for a given ambient light level, and after a predetermined time interval has elapsed, ramping up the brightness level from the reduced brightness level to the brightness level dictated by the brightness function and the detected ambient light level; and if the detected ambient light level is at or above the luminescence shock threshold, turning on the display device from the dark state to the brightness level appropriate for the detected ambient light level as dictated by the brightness function.
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31. A digital audio player including a computer-readable medium comprising program code for avoiding luminescence shock in a display device when a previously dark display device is suddenly illuminated, the program code for causing performance of a method comprising:
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detecting a current ambient light level at the display device at a time at which the display device is in a dark state; if the detected ambient light level is below a luminescence shock threshold, turning on the display device from the dark state to a reduced brightness level as compared to the brightness level normally appropriate for the detected current ambient light level as dictated by a brightness function, the brightness function representing a display brightness level for a given ambient light level, and after a predetermined time interval has elapsed, ramping up the brightness level from the reduced brightness level to the brightness level dictated by the brightness function and the detected ambient light level; and if the detected ambient light level is at or above the luminescence shock threshold, turning on the display device from the dark state to the brightness level appropriate for the detected ambient light level as dictated by the brightness function.
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Specification