Light Source Device for Backlight, Backlight Device for Liquid Crystal Display Apparatus and Transmissive Liquid Crystal Display

• US 20080024696A1
• Filed: 09/29/2005
• Published: 01/31/2008
• Est. Priority Date: 10/08/2004
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Oku, Takashi, Arai, Takeo
• Application Number:
  US11/664,551
• Publication Number:
  US 20080024696A1
• Time in Patent Office: Days
• US Class Current: 349/62
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources

Abstract

Disclosed is a color liquid crystal display apparatus (LCD) employing a transmissive color liquid crystal panel. The LCD includes three green (G) light emitting diodes (21G), two red (R) light emitting diodes (21R) and two blue (B) light emitting diodes (21B). A light source unit for backlight (30A) and a light source unit for backlight (30B) are adapted for mixing three prime-color light beams (R, B, G), radiated from the seven light emitting diodes (21), arranged as one light emitting diode unit, and for radiating the resulting mixed light. A color liquid crystal display panel (110) is illuminated from its backside by a liquid crystal display backlight device for liquid crystal display (140) made up by a plural number of light source units for backlight (30A) and a plural number of light source units for backlight (30B).

Claims

1. A light source unit for backlight constituting a liquid crystal display backlight light source device for illuminating a transmissive color liquid crystal display panel from a backside thereof, said light source unit for backlight comprising:

three green (G) light emitting diodes, two red (R) light emitting diodes and two blue (B) light emitting diodes;

wherein

three prime color light beams (R, G, B) radiated from said seven light emitting diodes are mixed, the resulting light being radiated, with said seven light emitting diodes as one unit,

out of said seven light emitting diodes, four light emitting diodes are arrayed in an upper row, with the remaining three being arrayed in a lower row,

in said upper row, green (G) light emitting diodes are arrayed at the leftmost and rightmost ends, with a red (R) light emitting diode and a blue (B) light emitting diode being arrayed adjacent to each other so as to be sandwiched between said green (G) light emitting diodes, and

in said lower row, a blue (B) light emitting diode and a red (R) light emitting diode are arrayed on both sides of a green (G) light emitting diode.

2. The light source unit for backlight according to claim 1 wherein said seven light emitting diodes as said one unit are encircled by a reflecting plate and wherein three prime color light beams (R, G, B) radiated from said seven light emitting diodes are locally mixed together and the resulting light is radiated.

3. A light source unit for backlight constituting a liquid crystal display backlight light source device for illuminating a transmissive color liquid crystal display panel from a backside thereof, said light source unit for backlight comprising:

three green (G) light emitting diodes, two red (R) light emitting diodes and two blue (B) light emitting diodes;

wherein

three prime color light beams (R, G, B) radiated from said seven light emitting diodes are mixed, the resulting light being radiated, with said seven light emitting diodes as one unit, and

said seven light emitting diodes are arrayed in a row, with green (G) light emitting diodes being arrayed at the leftmost end, rightmost end and at the center, with a red (R) light emitting diode and a blue (B) light emitting diode being arrayed sandwiched between the end and center green (G) light emitting diodes so as to be adjacent to each other, and with another red (R) light emitting diode and another blue (B) light emitting diode being arrayed sandwiched between the other end green (G) light emitting diode and the center green (G) light emitting diode so as to be adjacent to each other.

4. The light source unit for backlight according to claim 3 wherein said seven light emitting diodes as said one unit are encircled by a reflecting plate and wherein three prime color light beams (R, G, B) radiated from said seven light emitting diodes are locally mixed together and the resulting light is radiated.

5. A liquid crystal display backlight light source device for illuminating a transmissive color liquid crystal display panel from the backside thereof, said liquid crystal display backlight light source device comprising:

a plural number of light source units for backlight, each of said light source units for backlight including three green (G) light emitting diodes, two red (R) light emitting diodes and two blue (B) light emitting diodes, as one unit, each of said light source units for backlight mixing three prime color light beams (R, G, B) radiated from said seven light emitting diodes together to radiate the resulting light, with the seven light emitting diodes constituting a unit;

wherein

out of said seven light emitting diodes, four light emitting diodes are arrayed in an upper row, with the remaining three being arrayed in a lower row,

in said upper row, green (G) light emitting diodes are arrayed at the leftmost and rightmost ends, with a red (R) light emitting diode and a blue (B) light emitting diode being arrayed adjacent to each other so as to be sandwiched between said green (G) light emitting diodes, and

in said lower row, a blue (B) light emitting diode and a red (R) light emitting diode are arrayed on both sides of a green (G) light emitting diode.

6. The liquid crystal display backlight light source device according to claim 5 wherein said light source unit for backlight are

one or more first units for backlight, each first unit being formed by an upper row, made up of a green (G) light emitting diode, a red (R) light emitting diode, a blue (B) light emitting diode and a green (G) light emitting diode, in this order, looking from the leftmost end, and a lower row, made up of a blue (B) light emitting diode, a green (G) light emitting diode and a red (R) light emitting diode, in this order, looking from the leftmost end, and

one or more second units for backlight, each being formed by an upper row, made up of a green (G) light emitting diode, a blue (B) light emitting diode, a red (R) light emitting diode, and a green (G) light emitting diode, in this order, looking from the leftmost end, and a lower row, made up of a red (R) light emitting diode, a green (G) light emitting diode and a blue (B) light emitting diode, in this order, looking from the leftmost end,

said first and second units being arranged in combination in an optional sequence.

7. The liquid crystal display backlight light source device according to claim 5 wherein a plurality of said first light source units for backlight as one set and a plurality of said second light source units for backlight as one set are arranged alternately set by set along the longitudinal direction.

8. The liquid crystal display backlight light source device according to claim 5 wherein an even number of sets of said first light source units for backlight and an even number of sets of said second light source units for backlight are arranged so that light emitting diodes radiating the same color light are arranged at both ends along said longitudinal direction.

9. The liquid crystal display backlight light source device according to claim 5 wherein said seven light emitting diodes as said one unit are encircled by a reflecting plate and wherein three prime color light beams (R, G, B) radiated from said seven light emitting diodes are locally mixed together and the resulting light is radiated.

10. The liquid crystal display backlight light source device according to claim 5 wherein said light emitting diode is a side emission light emitting diode provided with an optical component for radiating light radiated from a light source from a lateral side thereof.

11. A liquid crystal display backlight light source device for illuminating a transmissive color liquid crystal display panel from the backside thereof, said liquid crystal display backlight light source device comprising:

a plural number of light source units for backlight, each of said light source units for backlight including three green (G) light emitting diodes, two red (R) light emitting diodes and two blue (B) light emitting diodes, as one unit, each of said light source units for backlight mixing three prime color light beams (R, G, B) radiated from said seven light emitting diodes together to radiate the resulting light;

wherein

said seven light emitting diodes are arrayed in a row, with green (G) light emitting diodes being arrayed at the leftmost end, rightmost end and at the center, with a red (R) light emitting diode and a blue (B) light emitting diode being arrayed sandwiched between the end and center green (G) light emitting diodes, and with another red (R) light emitting diode and another blue (B) light emitting diode being arrayed sandwiched between the other end green (G) light emitting diode and the center green (G) light emitting diode so as to be adjacent to each other.

12. The liquid crystal display backlight light source device according to claim 11 wherein said light source units for backlight are

one or more first units for backlight, each first unit being formed by a first unit formed by said seven light emitting diodes arrayed in a row in a sequence of GRBGBRG when looking from the leftmost end, and

a second unit formed by said seven light emitting diodes arrayed in a row in a sequence of GBRGRBG when looking from the leftmost end,

said first and second units being arranged in combination in an optional sequence.

13. The liquid crystal display backlight light source device according to claim 11 wherein said seven light emitting diodes as said one unit are encircled by a reflecting plate and wherein three prime color light beams (R, G, B) radiated from said seven light emitting diodes are locally mixed together and the resulting light is radiated.

14. The liquid crystal display backlight light source device according to claim 11 wherein said light emitting diode is a side emission light emitting diode provided with an optical component for radiating light radiated from a light source from a lateral side thereof.

15. A transmissive color liquid crystal display apparatus, formed by a transmissive color liquid crystal panel and a liquid crystal display backlight light source device for illuminating said transmissive color liquid crystal display panel from a backside thereof, wherein

said liquid crystal display backlight light source device includes a plurality of light source units each made up by three green (G) light emitting diodes, two red (R) light emitting diodes and two blue (B) light emitting diodes, as one unit, three prime color light beams (R, G, B) radiated from these seven light emitting diodes being mixed together, the resulting light being radiated,

out of said seven light emitting diodes, four light emitting diodes are arrayed in an upper row, with the remaining three being arrayed in a lower row,

in said upper row, green (G) light emitting diodes are arrayed at the leftmost and rightmost ends, with a red (R) light emitting diode and a blue (B) light emitting diode being arrayed adjacent to each other so as to be sandwiched between said green (G) light emitting diodes, and

in said lower row, a blue (B) light emitting diode and a red (R) light emitting diode are arrayed on both sides of a green (G) light emitting diode.

16. The transmissive color liquid crystal display apparatus according to claim 15 wherein said light source units for backlight are

one or more first units for backlight, each first unit being formed by an upper row, made up of a green (G) light emitting diode, a red (R) light emitting diode, a blue (B) light emitting diode and a green (G) light emitting diode, in this order, looking from the leftmost end, and a lower row, made up of a blue (B) light emitting diode, a green (G) light emitting diode and a red (R) light emitting diode, in this order, looking from the leftmost end, and

one or more second units for backlight, each being formed by an upper row, made up of a green (G) light emitting diode, a blue (B) light emitting diode, a red (R) light emitting diode, and a green (G) light emitting diode, in this order, looking from the leftmost end, and a lower row, made up of a red (R) light emitting diode, a green (G) light emitting diode and a blue (B) light emitting diode, in this order, looking from the leftmost end,

said first and second units being arranged in combination in an optional sequence.

17. The transmissive color liquid crystal display apparatus according to claim 15 wherein a plurality of said first light source units for backlight as one set and a plurality of said second light source units for backlight as one set are arranged alternately set by set along the longitudinal direction.

18. The transmissive color liquid crystal display apparatus according to claim 15 wherein an even number of sets of said first light source units for backlight and an even number of sets of said second light source units for backlight are arranged so that light emitting diodes radiating the same color light are arranged at both ends along said longitudinal direction.

19. The transmissive color liquid crystal display apparatus according to claim 15 wherein said seven light emitting diodes as said one unit are encircled by a reflecting plate and wherein three prime color light beams (R, G, B) radiated from said seven light emitting diodes are locally mixed together and the resulting light is radiated.

20. The transmissive color liquid crystal display apparatus according to claim 15 wherein said light emitting diode is a side emission light emitting diode provided with an optical component for radiating light radiated from a light source from a lateral side thereof.

21. A transmissive color liquid crystal display apparatus, formed by a transmissive color liquid crystal panel and a liquid crystal display backlight light source device for illuminating said transmissive color liquid crystal display panel from a backside thereof, wherein

said liquid crystal display backlight light source device includes a plurality of light source units for backlight, each being made up by three green (G) light emitting diodes, two red (R) light emitting diodes and two blue (B) light emitting diodes, as one unit, three prime color light beams (R, G, B) radiated from these seven light emitting diodes being mixed together, the resulting light being radiated, and

in each said light source unit for backlight, seven light emitting diodes are arrayed in a row, with green (G) light emitting diodes being arrayed at the leftmost end, rightmost end and at the center, with a red (R) light emitting diode and a blue (B) light emitting diode being arrayed sandwiched between the end and center green (G) light emitting diodes, and with another red (R) light emitting diode and another blue (B) light emitting diode being arrayed sandwiched between the other end green (G) light emitting diode and the center green (G) light emitting diode so as to be adjacent to each other.

22. The transmissive color liquid crystal display apparatus according to claim 21, wherein said light source units for backlight are

one or more first units for backlight, each first unit being formed by a first unit formed by said seven light emitting diodes arrayed in a row in a sequence of GRBGBRG when looking from the leftmost end, and

a second unit formed by said seven light emitting diodes arrayed in a row in a sequence of GBRGRBG when looking from the leftmost end,

said first and second units being arranged in combination in an optional sequence.

23. The transmissive color liquid crystal display apparatus according to claim 21 wherein said seven light emitting diodes as said one unit are encircled by a reflecting plate, and three prime color light beams (R, G, B) radiated from said seven light emitting diodes are locally mixed together, and the resulting light is radiated.

24. The transmissive color liquid crystal display apparatus according to claim 21 wherein said light emitting diode is a side emission light emitting diode provided with an optical component for radiating light radiated from a light source from a lateral side thereof.

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