Importance

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Abstract

The disclosure relates to an analog solid state display device for presenting an analog display of the state of charge and voltage of a battery, typically a rechargeable battery. There is disclosed an apparatus for deriving a signal which is a function of the state of charge of the battery to drive an analog solid state indicating display by such signal. The analog solid state indicating display can comprise an analog liquid crystal display of the voltage and state of charge of a battery to which the display is connected. In addition, there is disclosed a circuit for driving an analog liquid crystal display of the state of charge of the battery with the analog liquid display being disposed within the housing of a tool or appliance which contains the battery. The disclosure also relates to the indication of the state of charge of a battery by an analog liquid crystal display when the battery is under load. The display can comprise an analog bar graph presentation. The disclosure also pertains to an analog liquid crystal display to indicate both the state of charge of a battery and the rate of change of the state of charge of the battery. There is also disclosed a method of indicating the state of charge of a rechargeable battery which includes the steps of amplifying the output of the battery of which the charge is to be indicated while the battery is under load, subjecting the range of amplified outputs extending from a fully discharged condition to a fully charged condition of the battery to a predetermined electrical function, and applying the output which has been subjected to the predetermined electrical function to a display device in which the size, extent, or position of the display portion indicates the charge level and the state of charge of the battery.

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First Claim