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US 7,052,152 B2Granted
LCD backlight using two-dimensional array LEDs
AssigneePhilips Lumileds Lighting Company, LLC
InventorsGerard Harbers, William D. Collins, III
Life of this patent
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Abstract
One embodiment of the invention provides a backlight for an LCD display. The backlight uses a two-dimensional array of single color or white LEDs and a diffusing or phosphor coated cover plate. Various electrical connections of the LEDs and various phosphor color-conversion techniques are described.
Claims31
A display device comprising:
- a housing comprising reflective surfaces and a top opening through which light is emitted for backlighting a liquid crystal display (LCD) panel;
- an array of substantially identical light emitting diodes (LEDs) supported on a reflective bottom surface in the housing, the LEDs being separated from one another by a distance greater that the width of a single LED, wherein the housing has a height, and wherein a ratio of the height to a pitch of the LEDs is between approximately 0.3 to 1.2;
- and
- a diffuser above the LEDs for providing diffused light to an LCD panel.
1 more element
A display device comprising:
- a housing comprising reflective surfaces and a top opening through which light is emitted for backlighting a liquid crystal display (LCD) panel;
- an array of substantially identical light emitting diodes (LEDs) supported on a reflective bottom surface in the housing, the LEDs being separated from one another by a distance greater that the width of a single LED;
- and
- a diffuser above the LEDs for providing diffused light to an LCD panel,
- wherein a number of LEDs are connected in series, a total voltage drop across the serially connected LEDs approximately equaling a publicly supplied standard AC supply voltage that has been rectified and filtered to be DC, wherein LEDs in the array are connected to perform a rectification of the AC supply voltage.
2 more elements
A method for constructing a display comprising:
- providing a housing comprising reflective surfaces and a top opening through which light is emitted for backlighting a liquid crystal display (LCD) panel;
- providing an array of substantially identical light emitting diodes (LEDs) supported on a reflective bottom surface in the housing, the LEDs being separated from one another by a distance greater that the width of a single LED, wherein the housing has a height, and wherein a ratio of the height to a pitch of the LEDs is between approximately 0.3 to 1.2;
- and
- providing a diffuser above the LEDs for providing diffused light to an LCD panel.
1 more element
Dependencies are inferred from the claim text.