Electric lamp and discharge devices: systems – Automatic substitution of the power supply
Patent
1995-10-30
1998-10-06
Pascal, Robert J.
Electric lamp and discharge devices: systems
Automatic substitution of the power supply
315247, 315307, 315226, 315DIG4, 315DIG7, H05B 3702
Patent
active
058181725
ABSTRACT:
A back light circuit for a liquid crystal display (LCD) includes: an alternating current (AC) adapter, a battery for supplying a direct current (DC) when the alternating current (AC) adapter is not used, an adapter detecting unit for determining whether or not the alternating current (AC) adapter is being used, a direct current/direct current (DC/DC) converter for providing output of a switched signal, a direct current/alternating current (DC/AC) converter for driving a cold cathode fluorescent lamp (CCFL) by increasing an electric potential, a cold cathode fluorescent lamp (CCFL) operated by the direct current/alternating current (DC/AC) converter, an on/off controller for controlling the direct current/direct current (DC/DC) converter, a brightness controller for controlling the brightness of the cold cathode fluorescent lamp (CCFL), a feedback unit for providing feed back signals to the direct current/direct current (DC/DC) converter, a brightness condition detector for determining the brightness condition of the back-light of the liquid crystal display (LCD), a low battery/very low battery (LB/LLB) signal transmitter for generating a signal indicating the residual amount of battery power when the battery is being used, and a brightness condition controller for determining a brightness condition of the back light of the liquid crystal display (LCD). The back light of the liquid crystal display (LCD) is adjusted based on the condition of the battery, and further based on whether the alternating current (AC) adapter is being used.
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Bushnell Esq. Robert E.
Pascal Robert J.
Samsung Electronics Co,. Ltd.
Shingleton Michael
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