Method for controlling light source and optical input device using the same
First Claim
12. A method for controlling a light source in an optical input device for controlling an indicating position on a graphic display, comprising:
- setting a shutter ON time of an image sensor using a statistical value of an image obtained through the image sensor;
setting a light source ON time in accordance with the shutter ON time and turning on/off the light source and the shutter in response to the set light source ON time and the set shutter ON time; and
when the image sensor becomes a shutter OFF state and data to be transmitted are present, controlling the light source to transmit the data.
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Accused Products
Abstract
Disclosed is a method for controlling a light source and optical input device using the same. The light source controlling method includes setting a shutter ON time of an image sensor using a statistical value of an image obtained through the image sensor, and setting a light source ON time in accordance with the shutter ON time and turning on/off the light source and the shutter in response to the set light source ON time and the set shutter ON time. Thus, undesired consumption of electric power of the light source is prevented to increase energy efficiency by actively setting an ON/OFF period of the light source consuming the maximum electric current in the optical input device according to a shutter ON/OFF period. Further, availability of the light source and its electric current is enhanced by controlling the light source for the shutter OFF period and by allowing the light source to be used as a source for the data transmission.
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Citations
33 Claims
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12. A method for controlling a light source in an optical input device for controlling an indicating position on a graphic display, comprising:
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setting a shutter ON time of an image sensor using a statistical value of an image obtained through the image sensor;
setting a light source ON time in accordance with the shutter ON time and turning on/off the light source and the shutter in response to the set light source ON time and the set shutter ON time; and
when the image sensor becomes a shutter OFF state and data to be transmitted are present, controlling the light source to transmit the data. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An optical input device using a method for controlling a light source, comprising:
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an image sensor for collecting incident light when becoming a shutter ON state;
a movement calculator for calculating and outputting a value of movement using a quantity of the light collected on the image sensor;
a shutter controller for setting a shutter ON time according to brightness of a subject and controlling the image sensor according to the set shutter ON time; and
a light source controller for setting a light source ON time to correspond to the shutter ON time of the shutter controller, controlling the light source according to the set light source ON time, and when the image sensor becomes a shutter OFF state and the movement value is received from the movement calculator, controlling the light source to transmit the movement value. - View Dependent Claims (24, 25, 26, 27, 28)
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29. An optical input device using a method for controlling a light source, comprising:
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an image sensor for collecting incident light when becoming a shutter ON state;
a movement calculator for calculating and outputting a value of movement using a quantity of the light collected on the image sensor;
a shutter controller for setting a shutter ON time according to brightness of a subject and controlling the image sensor according to the set shutter ON time;
a light source controller for setting a light source ON time to correspond to the shutter ON time of the shutter controller and controlling the light source according to the set light source ON time;
a transmission light source controller for transmitting the movement value when the image sensor becomes a shutter OFF state and the movement value is received from the movement calculator; and
a transmission light source for performing ON/OFF operation in response to a transmission light source control signal transmitted from the transmission light source controller. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 30, 32, 33)
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30-1. The optical input device as set forth in claim 29, wherein the shutter ON time is set using an average value of output signals of the image sensor.
Specification