Display control apparatus capable of changing luminance depending on conditions of power supply circuit
First Claim
1. A flat panel display luminance control apparatus for a portable computer provided with a flat panel display unit for displaying data in response to luminance control, and first and second power supply means selectively used for supplying power to said flat panel display unit, said apparatus comprising:
- first determining means for determining if an output voltage of said first power supply means is greater than "0" but less than a predetermined value when said first power supply means is being used;
second determining means for determining if said second power supply means is being used; and
luminance control means, coupled to said first and second determining means, for supplying a first luminance control signal to said flat panel display unit when the output voltage is less than the predetermined value, and for supplying a second luminance control signal to said flat panel display unit when said second determining means determines that said second power supply means is being used, wherein said second luminance control signal has a value greater than a value of the first luminance control signal.
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Accused Products
Abstract
In a portable personal computer having a flat panel display and driven by battery or by AC adapter, a LOW battery state of battery is detected. In response to the low battery state, a luminance control signal having a minimum luminance value is supplied to the flat panel display. When the personal computer is driven by the AC adapter, a luminance control signal having a maximum luminance value is supplied to the flat panel display.
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Citations
29 Claims
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1. A flat panel display luminance control apparatus for a portable computer provided with a flat panel display unit for displaying data in response to luminance control, and first and second power supply means selectively used for supplying power to said flat panel display unit, said apparatus comprising:
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first determining means for determining if an output voltage of said first power supply means is greater than "0" but less than a predetermined value when said first power supply means is being used; second determining means for determining if said second power supply means is being used; and luminance control means, coupled to said first and second determining means, for supplying a first luminance control signal to said flat panel display unit when the output voltage is less than the predetermined value, and for supplying a second luminance control signal to said flat panel display unit when said second determining means determines that said second power supply means is being used, wherein said second luminance control signal has a value greater than a value of the first luminance control signal. - View Dependent Claims (2, 3)
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4. A luminance control method for a flat panel display unit in a personal computer provided with a flat panel display unit for displaying data in response to a luminance control signal and a power supply for supplying power to said flat panel display unit, said method comprising the steps
a) detecting, when said power supply comprises a of: - battery, whether said power supply has entered a low battery state;
b) controlling the luminance control signal having at least a minimum value greater than "0" and having a maximum value greater than the minimum value; and (c) supplying the controlled luminance control signal to said flat panel display unit in response to the detection of the low battery state. - View Dependent Claims (5, 6)
- battery, whether said power supply has entered a low battery state;
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7. A flat panel display luminance control apparatus for a portable computer provided with a flat panel display unit for displaying data in response to luminance control, and a battery for supplying power to said flat panel display unit, said apparatus comprising:
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means for determining whether an output voltage of said battery is at least one of a predetermined value greater than "0" and a value greater than "0" and less than the predetermined value; control means, coupled to said determining means, for supplying a first luminance control signal when the output voltage of said battery is determined not to be the predetermined value greater than "0" and the value greater than "0" and less than the predetermined value by said determining means, and for supplying a second luminance control signal when the output voltage of said battery is determined to be at least one of the predetermined value greater than "0" and the value greater than "0" and less than the predetermined value by said determining means, wherein said second luminance control signal has a value higher than a value of the first luminance control signal; and display means, coupled to said control means, for displaying data with a first luminance level in accordance with the first luminance control signal from said control means and for displaying data with a second luminance level higher than the first luminance level in accordance with the second luminance control signal. - View Dependent Claims (8, 9, 10)
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11. A battery-powered computer system, comprising:
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a flat panel display unit for displaying data in response to luminance control; first and second power supply means selectively used for supplying power to said flat panel display unit; first determining means for determining if an output voltage of said first power supply means is less than a predetermined value greater than "0" when said first power supply means is being used; second determining means for determining if said second power supply means is used; and luminance control means, coupled to said first and second determining means, for supplying a first luminance control signal to said flat panel display unit when the output voltage is less than the predetermined value, and for supplying a second luminance control signal to said flat panel display unit when said second determining means determines that said second power supply means is being used, wherein said second luminance control signal indicates a value greater than a value of the first luminance control signal. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A battery-powered computer system, comprising:
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a flat panel display unit for displaying data in response to luminance control; first and second power supply means selectively used for supplying power to said flat panel display unit; and a controller for determining if an output voltage of said first power supply means is greater than "0" but less than a predetermined value when said first power supply means is being used, for determining if said second power supply means is being used, and for supplying a first luminance control signal to said flat panel display unit when the output voltage is less than the predetermined value, and supplying a second luminance control signal to said flat panel display unit when said second power supply means is being used, wherein said second luminance control signal indicates a value greater than a value of the first luminance control signal. - View Dependent Claims (18, 19, 20, 21)
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22. A battery-powered computer system, comprising:
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a flat panel display unit for displaying data in response to luminance control; a battery and an external power supply selectively used supplying power to said flat panel display unit; first determining means for determining if an output voltage of said battery is less than a predetermined value greater than "0" when said battery is used; second determining means for determining if said external power supply is used; and luminance control means, coupled to said first and second determining means, for supplying a first luminance control signal to said flat panel display unit when the output voltage is less than the predetermined value, for supplying a second luminance control signal to said flat panel display unit when the output voltage is equal to or greater than the predetermined value, and for supplying a third luminance control signal to said flat panel display unit when the second determining means determines that said external power supply is being used, wherein each of the first, second and third luminance control signals indicates a value and the value for the first luminance control signal is less than the value for the second luminance control signal which is less than the value for the third luminance control signal. - View Dependent Claims (23, 24, 25)
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26. A battery-powered computer system, comprising:
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a flat panel display unit for displaying data in response to luminance control; a battery and an external power supply selectively used for supplying power to said flat panel display unit; and a controller for determining if an output voltage of said battery is greater than "0" but less than a predetermined value when said battery is being used, for determining if the output voltage of said battery is equal to or greater than the predetermined value, for determining if said external power supply is being used, and for supplying a first luminance control signal to said flat panel display unit when the output voltage is less than the predetermined value, for supplying a second luminance control signal to said flat panel display unit when the output voltage is equal to or greater than the predetermined value, and for supplying a third luminance control signal to said flat panel display unit when said external power supply is being used, wherein each of said first, second and third luminance control signals indicates a value and that value for the first luminance control signal is less than the value for the second luminance control signal which is less than the value for the third luminance control signal. - View Dependent Claims (27, 28, 29)
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Specification