Backlight unit and liquid crystal display device having the same
First Claim
Patent Images
1. A backlight unit comprising:
- a discrete light source section, a reflecting section, a light guide section, a first optical mixing section, and a second optical mixing section;
whereinthe reflecting section, the light guide section, the first optical mixing section, and the second optical mixing section are overlaid in this order;
the discrete light source section includes individual light sources having different spectra or different light emission quantities arranged near an incident plane of the light guide section;
a light drawing section configured to take a light propagating through the light guide section out on a reflecting section side or on a first optical mixing section side is provided on a surface of the light guide section facing the reflecting section or a surface facing the first optical mixing section;
the first optical mixing section is configured to mix color lights of different spectra or lights of different light quantities substantially in an in-plane direction to make the light uniform; and
the second optical mixing section is configured to mix lights at different angles in a same point in a plane to angularly realign the light to make a luminous light color and a luminous light quantity uniform in the plane.
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Accused Products
Abstract
A backlight unit has a light source, a reflection sheet, a light guide plate, an air space, and a diffuser, wherein the reflection sheet, the light guide plate, the air space, and the diffuser are overlaid in this order. The light source is configured to arrange individual light sources having different spectra or different light emission quantities near an incident plane of the light guide plate, and on a plane facing the reflection sheet of the light guide plate, scatter dots are disposed which take light propagating through the light guide plate out of the reflection sheet side. The backlight unit and a liquid crystal display device including the same have excellent display quality.
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Citations
56 Claims
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1. A backlight unit comprising:
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a discrete light source section, a reflecting section, a light guide section, a first optical mixing section, and a second optical mixing section;
whereinthe reflecting section, the light guide section, the first optical mixing section, and the second optical mixing section are overlaid in this order; the discrete light source section includes individual light sources having different spectra or different light emission quantities arranged near an incident plane of the light guide section; a light drawing section configured to take a light propagating through the light guide section out on a reflecting section side or on a first optical mixing section side is provided on a surface of the light guide section facing the reflecting section or a surface facing the first optical mixing section; the first optical mixing section is configured to mix color lights of different spectra or lights of different light quantities substantially in an in-plane direction to make the light uniform; and the second optical mixing section is configured to mix lights at different angles in a same point in a plane to angularly realign the light to make a luminous light color and a luminous light quantity uniform in the plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A liquid crystal display device comprising:
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a side lit backlight unit provided with a light guide plate and a light source portion disposed near at least one side end surface of the light guide plate; and a liquid crystal display panel disposed on a light emission plane side of the light guide plate;
whereina flexible substrate or a printed circuit board is disposed in a peripheral portion of the liquid crystal display panel and includes a driver circuit arranged to drive liquid crystals at every pixel of the liquid crystal display panel; and the flexible substrate or the printed circuit board is disposed so as not to cover the light source portion. - View Dependent Claims (41, 42, 43)
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44. A liquid crystal display device comprising:
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a backlight unit provided with a light guide plate, a light source portion, and a control portion; a liquid crystal display panel disposed on a light emission plane side of the light guide plate and having a plurality of pixels arranged in a display area; and a light quantity sensor disposed on a viewer side of the liquid crystal display panel;
whereinin an area of the liquid crystal display panel outside of the display area, the liquid crystal display panel has an area from which a red light, a green light, and a blue light are emitted from a backlight unit side; the light quantity sensor is arranged on the area of the liquid crystal display panel outside of the display area to detect a light quantity; and the control portion controls the light source portion based on the light quantity.
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45. A backlight unit comprising:
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a discrete light source section, a first reflecting section, a light guide section, a first optical mixing section, and a second optical mixing section;
whereinthe first reflecting section, the light guide section, the first optical mixing section, and the second optical mixing section are overlaid in this order; the discrete light source section includes individual light sources having different spectra or different light emission quantities arranged near an incident plane of the light guide section; a light drawing section configured to take a light propagating through the light guide section out on a first reflecting section side or on a first optical mixing section side is provided on a surface of the light guide section facing the first reflecting section or a surface facing the first optical mixing section; and a relationship, 0≦
Lp/H≦
2.5 is maintained, where a height of the first optical mixing section is H, and a length of a minimum unit of a cycle of an array of the discrete light source section is Lp. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification