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US 5,440,324 AGranted
Backlighting for liquid crystal display
AssigneeAvionic Displays Corporation
InventorsJames E. Strickling, III, Joseph W. Goode, III, William R. Dunn
Life of this patent
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Abstract
Described is a backlighting module that may be used in an electronic liquid crystal display device. The backlighting includes one or more lamps within a cavity of the module. The lamps are capable of a wide range of luminance including low-level luminance achieved by a unique burst modulation scheme for driving the lamps.
Claims9
An apparatus, comprising:
- a chassis;
- a liquid crystal display screen in association with and external to said chassis;
- a backlighting module immediately adjacent said liquid crystal display and in a secured relationship with said chassis, said module including a housing and said housing having a cavity formed integral therewith;
- and
- at least one hot cathode fluorescent lamp secured within said cavity formed in said module, such that said lamp provides backlighting to said liquid crystal display while said lamp is concealed within said housing of said module from all other directions, wherein said lamp is driven by a synchronized burst modulation wave form.
2 more elements
A method for providing low level, flicker free luminance for a backlighting lamp, said method comprising the steps of:
- selecting a fluorescent lamp;
- securing said lamp within a structure adjacent a liquid crystal display to provide backlighting for said liquid crystal display;
- driving said lamp and a filament within said lamp with a synchronized burst modulation wave form.
An apparatus, comprising:
- a chassis;
- a liquid crystal display screen in association with and external to said chassis;
- a backlighting module immediately adjacent said liquid crystal display and in a secured relationship with said chassis, said module including a housing and said housing having a cavity formed integral therewith, wherein said module is comprised of a one-piece housing made of aluminum;
- and at least one hot cathode fluorescent lamp secured within said cavity with a potting compound that fills the remaining voids in said cavity, such that said lamp provides backlighting to said liquid crystal display while said lamp is concealed within said housing of said module from all other directions, wherein said lamp is driven by a synchronized burst modulation wave form that drives the lamp on while the filament is off and then turns the lamp off and drives the filament, wherein said lamp is configured in a compact serpentine arrangement to provide increased lamp surface area in the limited space environment of said module.
1 more element
Dependencies are inferred from the claim text.