Direct-illumination backlight apparatus having transparent plate acting as light guide plate
First Claim
Patent Images
1. A direct-illumination backlight apparatus, comprising:
- a flat reflective plate;
an LED light source arranged on the reflective plate;
a transparent plate arranged above the LED light source;
a scattering pattern arranged on an underside of the transparent plate in a position corresponding to the LED light source; and
a light guide made of transparent material, and arranged around the scattering pattern to introduce light incident from below into the transparent plate so that the light is internally reflected by the transparent plate.
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Abstract
A direct-illumination backlight apparatus using LEDs includes a flat reflective plate, an LED light source, a transparent plate, a scattering pattern, and a light guide. The light guide serves to introduce a partial light from an LED light source at such an angle that the partial light is trapped inside the transparent plate, and the scattering pattern serves to scatter the trapped light beam at a position directly above the LED light source so that the scattered light beam escapes out of the transparent plate toward an LCD panel.
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Citations
20 Claims
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1. A direct-illumination backlight apparatus, comprising:
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a flat reflective plate; an LED light source arranged on the reflective plate; a transparent plate arranged above the LED light source; a scattering pattern arranged on an underside of the transparent plate in a position corresponding to the LED light source; and a light guide made of transparent material, and arranged around the scattering pattern to introduce light incident from below into the transparent plate so that the light is internally reflected by the transparent plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A direct-illumination backlight apparatus, comprising:
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a reflective plate; an LED light source arranged on the reflective plate; a transparent plate arranged above the LED light source and having opposite upper side and underside; a scattering pattern arranged directly on the underside of the transparent plate in a position corresponding to the LED light source; and a light guide made of transparent material, and arranged adjacent the scattering pattern to introduce light incident from below into the transparent plate under conditions of total internal reflection so that the light is internally reflected within the transparent plate until said internally reflected light is incident upon the scattering pattern which is adapted to scatter the incident light upwardly. - View Dependent Claims (18, 19, 20)
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Specification