Method and related device for controlling illumination of a backlight of a liquid crystal display
First Claim
1. A method for controlling illumination of a backlight of a Liquid Crystal Display (LCD), the method comprising:
- providing a light sensor capable of measuring an ambient light intensity to generate a corresponding measured ambient light intensity value;
providing a processing circuit for interpreting the measured ambient light intensity value;
providing a light source that is controllable by the processor;
providing an LCD device capable of being illuminated by the light source;
the processing circuit calculating a light source intensity value based on a desired apparent light source brightness value and the measured ambient light intensity value; and
the processor triggering the light source to emit light at a time-averaged intensity that corresponds to the calculated light source intensity value.
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Accused Products
Abstract
A method and device for controlling the illumination of a backlight of an LCD includes a light sensor that generates an ambient light intensity value, a processor that interprets the measured ambient light intensity value, a light source that is controlled by the processor, and an LCD device that is illuminated by the light source. The processor first calculates a light source intensity value based on a user-adjustable desired apparent light source brightness value and the measured ambient light intensity value. The processor then triggers the light source to emit light at a time-averaged intensity, utilizing frequency variation or a varying duty cycle, which corresponds to the calculated light source intensity value, such that the LCD device is illuminated. In this way, the information displayed on the LCD is clearly visible to a user in any ambient lighting condition.
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Citations
19 Claims
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1. A method for controlling illumination of a backlight of a Liquid Crystal Display (LCD), the method comprising:
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providing a light sensor capable of measuring an ambient light intensity to generate a corresponding measured ambient light intensity value;
providing a processing circuit for interpreting the measured ambient light intensity value;
providing a light source that is controllable by the processor;
providing an LCD device capable of being illuminated by the light source;
the processing circuit calculating a light source intensity value based on a desired apparent light source brightness value and the measured ambient light intensity value; and
the processor triggering the light source to emit light at a time-averaged intensity that corresponds to the calculated light source intensity value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for controlling the illumination of a backlight of a liquid crystal display (LCD), the device comprising:
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a light sensor capable of measuring an ambient light intensity to generate a corresponding measured ambient light intensity value;
an LCD;
a light source for illuminating the LCD;
a memory comprising;
a selection program to select a desired apparent light source brightness value stored in a portion of the memory;
a calculation program to generate a light source intensity value based on the ambient light intensity value and the desired apparent light source brightness value; and
a control program to control the light source according to the light source intensity value; and
a processor for executing the programs of the memory. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification