Thin Backlight With Flipped Light Emitting Diode
First Claim
1. A liquid crystal display (LCD) device comprising:
- a light emitting diode (LED) die, the LED die being a flip-chip having all electrical terminals on a first surface, the LED die having side surfaces adjacent to the first surface and having a second surface opposing the first surface;
a substantially rectangular light guide formed of a solid material, the light guide having a front surface and a rear surface, light emitted from the LED die being coupled into the light guide; and
liquid crystal layers over the front surface of the light guide such that light emitted from the front surface of the light guide in a first direction illuminates a rear surface of the liquid crystal layers as a backlight,the LED die being mounted in the LCD device proximate to the light guide such that the first surface of the LED die faces substantially the first direction, and at least a portion of the LED die lies in a plane between the front surface of the light guide and the rear surface of the light guide.
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Accused Products
Abstract
One or more LEDs are mounted within an LCD without the use of any printed circuit board (PCB), thus reducing the thickness of the LCD by about the thickness of the conventional PCB. In one embodiment, the LED and submount are mounted so that the submount is opposing the liquid crystal layer side of the LCD, so that the liquid crystal layers provide the mechanical support for the submount and LED die. The LED die (mounted on the submount) may be inserted into a cavity formed in the “top” surface of the light guide, and the top surface of the light guide is abutted against the liquid crystal layers. In such a configuration, the LED light source, including all supporting components, adds no thickness to the LCD. In another embodiment, on the “bottom” surface of the LCD opposing the LED die is an electrically switchable mirror that is either reflective or transparent. In its transparent state, the LED in the LCD may be used as a flash in a cell phone camera, while the LCD may be viewed to take the picture.
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Citations
20 Claims
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1. A liquid crystal display (LCD) device comprising:
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a light emitting diode (LED) die, the LED die being a flip-chip having all electrical terminals on a first surface, the LED die having side surfaces adjacent to the first surface and having a second surface opposing the first surface; a substantially rectangular light guide formed of a solid material, the light guide having a front surface and a rear surface, light emitted from the LED die being coupled into the light guide; and liquid crystal layers over the front surface of the light guide such that light emitted from the front surface of the light guide in a first direction illuminates a rear surface of the liquid crystal layers as a backlight, the LED die being mounted in the LCD device proximate to the light guide such that the first surface of the LED die faces substantially the first direction, and at least a portion of the LED die lies in a plane between the front surface of the light guide and the rear surface of the light guide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification