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US 7,922,368 B2Granted
Light module and flat light unit in a liquid crystal display device
AssigneeLG Display Co., Ltd.
InventorsJae Bum Kim, Jae Kyung Kang, Sung Keun Lee, Jae Jin Kim, Hyung Dong Kim, Sang Dae Lee
Life of this patent
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Abstract
A liquid crystal display device may include a backlight unit for providing light for the display. A backlight unit may include light modules. The light modules include colored LEDs surrounded by a first lens for refracting the light from the LEDs. A second lens surrounds the first lens for further refraction of the light to improve brightness and the uniformity of the light.
Claims9
A backlight unit comprising:
- a second substrate including at least one light cube, the light cube having:
- red, green, and blue light emitting diodes disposed on a first substrate;
- a first lens disposed on the first substrate to cover the red, green, and blue light emitting diodes;
- a second lens having a concave portion that receives the first lens and forming a space between the first lens and the second lens;
- a diffusion sheet disposed on a reflective sheet;
- a light concentrating sheet disposed on the diffusion sheet,
- wherein the first lens is formed of a silicon material and has a hemispheric shape that is disposed on the red, green and blue light emitting diodes,
- wherein the concave portion has a slant surface and a space with a curved surface including a large amount of curvature, a medium curvature, and a small curvature on the top, middle and bottom, respectively,
- wherein the space between the first lens and second lens operates as a third lens to make more refraction at the surface of the first lens and the concave surface of the second lens,
- wherein the concave portion of the second lens includes an inner surface having a pentagon shaped surface in cross section along a light emitting axis of the light cube wherein the pentagon shaped surface has one of five sides open to receive the first lens and the first substrate.
7 more elements
A liquid crystal display device comprising:
- a flat light device;
- and
- a liquid crystal panel adjusting a transmission amount of light from the flat light device,
- wherein the flat light device comprising:
- a second substrate including at least one light cube, the light cube having:
- red, green, and blue light emitting diodes disposed on a first substrate;
- a first lens disposed on the first substrate to cover the red, green, and blue light emitting diodes;
- and a second lens having a concave portion that receives the first lens and forming a space between the first lens and the second lens;
- a diffusion sheet disposed on a reflective sheet;
- and
- a light concentrating sheet disposed on the diffusion sheet,
- wherein the first lens is formed of a silicon material and has a hemispheric shape that is disposed on the red, green and blue light emitting diodes,
- wherein the concave portion has a slant surface and a space with a curved surface including a large amount of curvature, a medium curvature, and a small curvature on the top, middle and bottom, respectively,
- wherein the concave portion of the second lens includes an inner surface having a pentagon shaped surface in cross section along a light emitting axis of the light cube wherein the pentagon shaped surface has one of five sides open to receive the first lens and the first substrate,
- wherein the space between the first lens and second lens operates as a third lens to make more refraction at the surface of the first lens and the concave surface of the second lens,
- wherein the first lens refracts the light twice based on the refraction upon a red, green and blue light hitting the inside of the first lens and then being refracted upon the light leaving the first lens.
13 more elements
Dependencies are inferred from the claim text.