Lamp drive apparatus and drive method of a notebook computer
First Claim
1. A method of driving a lamp for an LCD of a portable computer, comprising:
- setting a default brightness in the LCD that corresponds to a prescribed value stored in the portable computer;
checking a surrounding temperature of the LCD;
selecting one of a first mode and a second mode for operating the lamp, wherein operating the lamp is the first mode comprises,receiving a user selected one of plurality of brightness control levels to set a first brightness and determining a corresponding first drive current as a drive current for the lamp,maintaining the first brightness within a first temperature range while the drive current varies to reduce lamp power consumption,determining a corresponding drive current at a minimum temperature of the first temperature range as a second drive current for a second temperature range that is below the first temperature range, andmaintaining the second drive current while the temperature of the lamp is within the second temperature range to reduce the lamp power consumption, and wherein the operating the lamp in the second mode comprises,determining a third drive current that corresponds to the default brightness,maintaining the third drive current within a third temperature range while the brightness changes,determining a corresponding brightness level at a minimum temperature of the third temperature range to set a fourth brightness for a fourth temperature range that is below the third temperature range, andmaintaining the fourth brightness while the temperature of the lamp is within the fourth temperature range while the drive current changes.
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Abstract
This present invention relates to a lamp drive apparatus and a drive method for an LCD equipped portable electronics to maintain a user-selected level of brightness in accordance with surrounding temperature of the lamp. In one operation mode a lamp drive apparatus reduces the current, which is applied into the lamp to maintain the already selected level of brightness in accordance with a detected lamp surrounding temperature where the brightness of the lamp has already been set in the LCD, to make the LCD device to illuminate no brighter than the selected level of brightness. Accordingly, the battery power can be used more efficiently or effectively. Thus, the battery life can be extended.
8 Citations
13 Claims
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1. A method of driving a lamp for an LCD of a portable computer, comprising:
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setting a default brightness in the LCD that corresponds to a prescribed value stored in the portable computer; checking a surrounding temperature of the LCD; selecting one of a first mode and a second mode for operating the lamp, wherein operating the lamp is the first mode comprises, receiving a user selected one of plurality of brightness control levels to set a first brightness and determining a corresponding first drive current as a drive current for the lamp, maintaining the first brightness within a first temperature range while the drive current varies to reduce lamp power consumption, determining a corresponding drive current at a minimum temperature of the first temperature range as a second drive current for a second temperature range that is below the first temperature range, and maintaining the second drive current while the temperature of the lamp is within the second temperature range to reduce the lamp power consumption, and wherein the operating the lamp in the second mode comprises, determining a third drive current that corresponds to the default brightness, maintaining the third drive current within a third temperature range while the brightness changes, determining a corresponding brightness level at a minimum temperature of the third temperature range to set a fourth brightness for a fourth temperature range that is below the third temperature range, and maintaining the fourth brightness while the temperature of the lamp is within the fourth temperature range while the drive current changes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A lamp drive method of a portable computer, comprising:
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selecting a standard temperature of a lamp driving an LCD; selecting a brightness control level of a plurality of brightness control levels that determines a corresponding brightness in the LCD according to the standard temperature; detecting surrounding temperature of the lamp; selecting one of a first mode and a second mode for operating the lamp, wherein operating the lamp in the first mode comprises, reducing a drive current that is to be applied into the lamp to maintain the corresponding brightness within the plurality of brightness control levels in accordance with a change in the detected surrounding temperature of a lamp, and wherein operating the lamp in the second mode comprises, reducing the brightness of the LCD in accordance with the change in detected surrounding temperature of the lamp to maintain a corresponding drive current of the selected brightness control level, and wherein the corresponding drive current is determined at a minimum temperature of a first temperature range of the first mode and maintained while the temperature of the lamp is within a second temperature range that is below the first temperature range in the second mode. - View Dependent Claims (12, 13)
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Specification