LIGHT SOURCE APPARATUS, BACKLIGHT APPARATUS, LIQUID CRYSTAL DISPLAY APPARATUS, AND MANUFACTURING METHOD OF BACKLIGHT APPARATUS

• US 20080117356A1
• Filed: 11/19/2007
• Published: 05/22/2008
• Est. Priority Date: 11/21/2006
• Status: Active Grant

• Current Assignee: Saturn Licensing LLC (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kobayashi, Naoto, Oku, Takashi, Uba, Tomohisa
• Granted Patent: US 8,009,247 B2
• Time in Patent Office: Days
• US Class Current: 349/62
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources

Abstract

A light source apparatus used in a backlight apparatus is disclosed. The light source apparatus includes a light-emitting diode unit and a wiring board. The light-emitting diode unit is provided as one unit by nonlinearly and closely placing respective light-emitting diodes of red, green, and blue colors, at least the light-emitting diode of one color out of the light-emitting diodes of the respective colors being constituted by first and second light-emitting diodes having different chromaticities such that an average chromaticity of the first and second light-emitting diodes is a predetermined chromaticity. On the wiring board, a plurality of light-emitting diode units are arranged at predetermined intervals in a predetermined direction.

Claims

1. A light source apparatus used in a backlight apparatus, comprising:

a light-emitting diode unit provided as one unit by nonlinearly and closely placing respective light-emitting diodes of red, green, and blue colors, at least the light-emitting diode of one color out of the light-emitting diodes of the respective colors being constituted by first and second light-emitting diodes having different chromaticities such that an average chromaticity of the first and second light-emitting diodes is a predetermined chromaticity; and

a wiring board on which a plurality of the light-emitting diode units are arranged at predetermined intervals in a predetermined direction.

2. The light source apparatus as set forth in claim 1,

wherein the respective light-emitting diode units each include one red light-emitting diode, one blue light-emitting diode, one first green light-emitting diode having a first chromaticity, and one second green light-emitting diode having a second chromaticity which is different from the first chromaticity, the average chromaticity of the first chromaticity and the second chromaticity being the predetermined chromaticity.

3. The light source apparatus as set forth in claim 2,

wherein in the respective light-emitting diode units, the red light-emitting diode and blue light-emitting diode are provided on a first straight line nearly parallel to the predetermined direction on the wiring board, and the first and second green light-emitting diodes are provided on a second straight line nearly orthogonal to the first straight line such that respective distances from the red light-emitting diode and blue light-emitting diode become nearly equal.

4. The light source apparatus as set forth in claim 3,

wherein the respective light-emitting diode units are provided such that the respective first and second green light-emitting diodes are arranged in a zigzag manner along the predetermined direction.

5. The light source apparatus as set forth in claim 2,

wherein in the respective light-emitting diode units, the first and second green light-emitting diodes are provided such that an average luminance of a first luminance of the first green light-emitting diode and a second luminance of the second green light-emitting diode which is different from the first luminance is a predetermined luminance.

6. A light source apparatus used in a backlight apparatus, comprising:

a light-emitting diode unit provided as one unit by nonlinearly and closely placing respective light-emitting diodes of red, green, and blue colors, at least the light-emitting diode of one color out of the light-emitting diodes of the respective colors being constituted by a plurality of light-emitting diodes having different luminances such that an average luminance of the first and second light-emitting diodes is a predetermined luminance; and

a wiring board on which a plurality of the light-emitting diode units are arranged at predetermined intervals in a predetermined direction.

7. A backlight apparatus, comprising:

a light source apparatus including a light-emitting diode unit provided as one unit by nonlinearly and closely placing respective light-emitting diodes of red, green, and blue colors, at least the light-emitting diode of one color out of the light-emitting diodes of the respective colors being constituted by first and second light-emitting diodes having different chromaticities such that an average chromaticity of the first and second light-emitting diodes is a predetermined chromaticity, and a wiring board on which a plurality of the light-emitting diode units are arranged at predetermined intervals in a first direction; and

a housing to place a plurality of the light source apparatuses in a matrix in the first direction and a second direction which is nearly orthogonal to the first direction on a predetermined plane.

8. The backlight apparatus as set forth in claim 7,

wherein the respective light source apparatuses each have first and second connectors provided at first and second positions, respectively, on the wiring board to electrically connect the respective light source apparatuses, the respective light source apparatuses being placed while being alternately inverted 180 degrees on the predetermined plane such that the first connector of one light source apparatus and the second connector of another light source apparatus which is adjacent to the one light source apparatus in the second direction face each other and the second connector of the one light source apparatus and the first connector of the other light source apparatus face each other, and

wherein the respective light-emitting diode units are provided such that the respective first and second light-emitting diodes are arranged in a zigzag manner along the first direction.

9. A backlight apparatus, comprising:

a light source apparatus including a light-emitting diode unit provided as one unit by nonlinearly and closely placing respective light-emitting diodes of red, green, and blue colors, at least the light-emitting diode of one color out of the light-emitting diodes of the respective colors being constituted by first and second light-emitting diodes having different luminances such that an average luminance of the first and second light-emitting diodes is a predetermined luminance, and a wiring board on which a plurality of the light-emitting diode units are arranged at predetermined intervals in a first direction; and

a housing to place a plurality of the light source apparatuses in a matrix in the first direction and a second direction nearly orthogonal to the first direction on a predetermined plane.

10. The backlight apparatus as set forth in claim 9,

wherein the respective light source apparatuses each have first and second connectors provided at first and second positions, respectively, on the wiring board to electrically connect the respective light source apparatuses, the respective light source apparatuses being placed while being alternately inverted 180 degrees on the predetermined plane such that the first connector of one light source apparatus and the second connector of another light source apparatus which is adjacent to the one light source apparatus in the second direction face each other and the second connector of the one light source apparatus and the first connector of the other light source apparatus face each other, and

wherein the respective light-emitting diode units are provided such that the respective first and second light-emitting diodes are arranged in a zigzag manner along the first direction.

11. A backlight apparatus, comprising:

a light source apparatus including a light-emitting diode unit provided as one unit by nonlinearly and closely placing respective light-emitting diodes of red, green, and blue colors, at least the light-emitting diode of one color out of the light-emitting diodes of the respective colors being constituted by first and second light-emitting diodes having different chromaticities and luminances such that an average chromaticity of the first and second light-emitting diodes is a predetermined chromaticity and an average luminance of the first and second light-emitting diodes is a predetermined luminance, and a wiring board on which a plurality of the light-emitting diode units are arranged at predetermined intervals in a first direction; and

a housing to place a plurality of the light source apparatuses in a matrix in the first direction and a second direction nearly orthogonal to the first direction on a predetermined plane.

12. The backlight apparatus as set forth in claim 11,

wherein the respective light source apparatuses each have first and second connectors provided at first and second positions, respectively, on the wiring board to electrically connect the respective light source apparatuses, the respective light source apparatuses being placed while being alternately inverted 180 degrees on the predetermined plane such that the first connector of one light source apparatus and the second connector of another light source apparatus which is adjacent to the one light source apparatus in the second direction face each other and the second connector of the one light source apparatus and the first connector of the other light source apparatus face each other, and

wherein the respective light-emitting diode units are provided such that the respective first and second light-emitting diodes are arranged in a zigzag manner along the first direction.

13. A manufacturing method of a backlight apparatus, comprising the steps of:

selecting first and second light-emitting diodes having different chromaticities for at least a light-emitting diode of one color out of respective light-emitting diodes of red, green, and blue colors such that an average chromaticity of the first and second light-emitting diodes is a predetermined chromaticity;

constituting one light-emitting diode unit by nonlinearly and closely placing respective light-emitting diodes of the respective colors including the selected first and second light-emitting diodes, and forming one light source apparatus by providing a plurality of the light-emitting diode units in a row in a first direction on a wiring board; and

placing a plurality of the light source apparatuses in a matrix in the first direction and a second direction nearly orthogonal to the first direction on a predetermined plane in a housing.

14. A liquid crystal display apparatus, comprising:

a backlight apparatus including a light source apparatus having a light-emitting diode unit provided as one unit by nonlinearly and closely placing respective light-emitting diodes of red, green, and blue colors, at least the light-emitting diode of one color out of the light-emitting diodes of the respective colors being constituted by first and second light-emitting diodes having different chromaticities such that an average chromaticity of the first and second light-emitting diodes is a predetermined chromaticity and a wiring board on which a plurality of the light-emitting diode units are arranged at predetermined intervals in a first direction, and a housing to place a plurality of the light source apparatuses in a matrix in the first direction and a second direction nearly orthogonal to the first direction on a predetermined plane; and

a liquid crystal panel allowing a picture to be displayed by changing a transmittance of emitted light from the light-emitting diode unit.

15. A backlight apparatus, comprising:

a light source having a plurality of light-emitting diodes;

a reflector plate provided so as to cover the light source, having opening portions to expose the respective light-emitting diodes, and reflecting emitted light from the light-emitting diode; and

a reflectivity lowering section provided at a peripheral edge portion of the reflector plate and allowing a reflectivity of the emitted light to be lowered.

16. A liquid crystal display apparatus, comprising:

a backlight apparatus including a light source having a plurality of light-emitting diodes, a reflector plate provided so as to cover the light source, having opening portions to expose the respective light-emitting diodes, and reflecting emitted light from the light-emitting diode, and a reflectivity lowering section provided at a peripheral edge portion of the reflector plate and allowing a reflectivity of the emitted light to be lowered; and

a liquid crystal panel allowing a picture to be displayed by changing a transmittance of the emitted light reflected by the reflector plate.