LED backlight and liquid crystal display device using thereof
First Claim
1. A backlight comprising:
- a light guide plate;
a light diffusing optical waveguide disposed adjacent said light guide plate;
a white LED disposed on said light diffusing optical waveguide such that said light diffusing optical waveguide is sandwiched between said white LED and said light guide plate, said white LED emitting light toward a side of said light guide plate; and
a single color LED disposed on a different side of said light diffusing optical waveguide than said white LED.
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Accused Products
Abstract
An object of the present invention is to improve the color reproduction capability of a liquid crystal display backlight using white LEDs.
A backlight of the present invention includes: a light guide plate 6; a light diffusing optical waveguide 3 disposed adjacent the light guide plate 6; a plurality of white LEDs 1 disposed on the light diffusing optical waveguide 3; and single color LEDs (red LEDs) 2 disposed on respective opposite sides of the light diffusing optical waveguide 3; wherein light from the white LEDs 1 passes through the light diffusing optical waveguide 3 and enters the light guide plate 6 through a side thereof, whereas light from the single color LEDs 2 is diffused by the light diffusing optical waveguide 3 before entering the light guide plate 6 through the same side thereof. Thus, the light diffusing optical waveguide 3 mixes light from the white LEDs 1 and single color LEDs 2, resulting in improved color reproduction capability of the backlight.
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Citations
18 Claims
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1. A backlight comprising:
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a light guide plate; a light diffusing optical waveguide disposed adjacent said light guide plate; a white LED disposed on said light diffusing optical waveguide such that said light diffusing optical waveguide is sandwiched between said white LED and said light guide plate, said white LED emitting light toward a side of said light guide plate; and a single color LED disposed on a different side of said light diffusing optical waveguide than said white LED. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A liquid crystal display device comprising:
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a white LED backlight; and a display panel for controlling light from said backlight to display an image; wherein said backlight comprises; a light guide plate; a light diffusing optical waveguide disposed adjacent said light guide plate; a white LED disposed on said light diffusing optical waveguide such that said light diffusing optical waveguide is sandwiched between said white LED and said light guide plate, said white LED emitting light toward a side of said light guide plate; and a single color LED disposed on a different side of said light diffusing optical waveguide than said white LED. - View Dependent Claims (9, 10, 11, 12)
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13. A backlight comprising:
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a light guide plate; a light diffusing optical waveguide disposed adjacent said light guide plate; a white LED disposed on said light diffusing optical waveguide such that said light diffusing optical waveguide is sandwiched between said white LED and said light guide plate, said white LED emitting light toward a side of said light guide plate; a single color LED disposed on a different side of said light diffusing optical waveguide than said white LED; and a metal substrate having reflective properties; wherein said light diffusing optical waveguide, said white LED, and said single color LED are formed on said reflective metal substrate. - View Dependent Claims (14, 15)
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16. A liquid crystal display device comprising:
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a white LED backlight; and a display panel for controlling light from said backlight to display an image; wherein said backlight comprises; a light guide plate; a light diffusing optical waveguide disposed adjacent said light guide plate; a white LED disposed on said light diffusing optical waveguide such that said light diffusing optical waveguide is sandwiched between said white LED and said light guide plate, said white LED emitting light toward a side of said light guide plate; a single color LED disposed on a different side of said light diffusing optical waveguide than said white LED; and a metal substrate having reflective properties; and wherein said light diffusing optical waveguide, said white LED, and said single color LED are formed on said reflective metal substrate. - View Dependent Claims (17, 18)
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Specification