LCD backlight using two-dimensional array LEDs
DCFirst Claim
Patent Images
1. 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.
4 Assignments
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1 Petition
Reexamination
Accused Products
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.
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Citations
31 Claims
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1. A display device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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15. A display device comprising:
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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.
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30. A method for constructing a display comprising:
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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. - View Dependent Claims (31)
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Specification