Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-11-27
1994-11-08
Gross, Anita P.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 86, G02F 11335, G02F 1133
Patent
active
053632230
ABSTRACT:
A problem arises in electronic equipment incorporating a display, such as an LCD display, which is not intrinsically illuminated. The present invention provides a controlled backlight for such displays, and is particularly useful in battery-powered equipment where power consumption must be kept to a minimum. The circuitry comprises a display 1 controlled via a conventional display driver 6 from other equipment (not shown) such as a microprocessor. Whenever the display is changed a signal is sent also to a timer circuit 7 which triggers, and passes a control signal to an electronic switch 4 which in turn passes power from a battery 3 to a lamp 2. The lamp 2 is arranged to illuminate the display 1. After a preset period, the timer circuit 7 sends a further control signal to the switch 4 to switch lamp 2 off.
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patent: 4959642 (1990-09-01), Sharples
patent: 5153756 (1992-10-01), Ike
patent: 5157525 (1992-10-01), Eaton et al.
patent: 5162785 (1992-11-01), Fagard
patent: 5193016 (1993-03-01), Cornuejols
patent: 5225822 (1993-07-01), Shiraishi et al.
Gross Anita P.
Shaye Communications Limited
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