LIGHT EMITTING DEVICE AND DISPLAY DEVICE

• US 20100073912A1
• Filed: 04/02/2008
• Published: 03/25/2010
• Est. Priority Date: 04/13/2007
• Status: Abandoned Application

• Current Assignee: Showa Denko KK
• Original Assignee: Showa Denko KK
• Inventors: Gomi, Shuji, Shinozaki, Kenji
• Application Number:
  US12/595,421
• Publication Number:
  US 20100073912A1
• Time in Patent Office: Days
• US Class Current: 362/97.100
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H05K 1/0206 by printed thermal vias
• CPC Class Codes: H05K 1/142 Arrangements of planar printed circuit boards in the same plane, e.g. auxiliary printed circuit insert mounted in a main printed circuit
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10409 Screws
• CPC Class Codes: H05K 3/0061 onto a metallic substrate, e.g. a heat sink heat sinks for electric apparatus H05K7/20
• CPC Class Codes: H05K 3/42 Plated through-holes or plated via connections

Abstract

A backlight device (10) is provided with a strip-like light source (30) and a backlight frame (11). In the strip-like light source, a plurality of sub-mounts (40) are arranged in a row on a strip-like substrate having a short width and a long length. In the sub-mount, LEDs of each of red (R), green (G) and blue (B) or LEDs of RGGB are arranged as one unit. In the backlight frame, a plurality of strip-like light sources (30) are two-dimensionally arranged at intervals. The strip-like light sources (30) are arranged so that each position of the sub-mount (40) arranged on the strip-like light source (30) in a first row and each position of the sub-mount (40) arranged on the strip-like light source (30) in the adjacent second row are shifted in the longitudinal direction of the strip-like light source (30). Thus, a display device which has a remarkably reduced area of substrate having the light source rows and excellent uniformity of luminance and chromaticity is provided.

Claims

1. A light emitting device comprising:

a strip-like light source having a strip-like substrate on which a plurality of units each having, as a single unit, any one of a set of one red (R), one green (G) and one blue (B) light-emitting elements arranged therein and a set of one red (R), one green (G), one green (G) and one blue (B) light-emitting elements arranged therein are arranged in line, the strip-like substrate having a short width and a long length; and

a frame on which a plurality of the strip-like light sources are arranged two-dimensionally at intervals.

2. The light emitting device according to claim 1, wherein, the plurality of strip-like light sources are arranged on the frame so that, in a longitudinal direction of the strip-like light source, positions of the plurality of units arranged on the strip-like light source in a first row may be shifted from positions of the units arranged on the strip-like light source in a second row adjacent to the first row.

3. The light emitting device according to claim 2, wherein, on the frame, each of the positions of the plurality of units arranged on the strip-like light source in the first row is shifted from corresponding one of the positions of the plurality of units arranged on the strip-like light source in the second row adjacent to the first row by substantially half of a pitch between the plurality of units arranged on each of the strip-like light sources.

4. The light emitting device according to claim 1, wherein two of the units that are arranged on a predetermined one of the strip-like light sources, and one of the units that is arranged on another one of the strip-like light sources in another row adjacent to the predetermined strip-like light source and that is the closest to the two of the units, have such a positional relationship as to form a substantially equilateral triangle.

5. The light emitting device according to claim 1, wherein the strip-like light source is provided with the plurality of units arranged on the strip-like substrate, and is provided with a terminal on the strip-like substrate, the terminal being electrically connected to the plurality of units.

6. The light emitting device according to claim 5, wherein the terminal provided on the strip-like light source is arranged on the strip-like substrate with a longitudinal direction thereof being set to the same direction as a direction of the row of the plurality of units provided on the strip-like light source.

7. The light emitting device according to claim 5, further comprising a relay substrate that is arranged between the plurality of strip-like light sources on the frame and that is electrically connected to the terminal of each of the light-emitting sources.

8. A display device comprising:

a display panel that displays an image; and

a light emitting device that is provided on a back side of the display panel,

the light emitting device including;

a strip-like light source having a strip-like substrate on which a plurality of units each having, as a single unit, among red (R), green (G) and blue (B) light-emitting elements, any one of a set of one red (R), one green (G) and one blue (B) light-emitting elements arranged therein and a set of one red (R), one green (G), one green (G) and one blue (B) light-emitting elements arranged therein are arranged in line, the strip-like substrate having a short width and a long length; and

a frame on which a plurality of the strip-like light sources are arranged two-dimensionally with gaps, each of the gaps between rows of the plurality of strip-like light sources being larger than the width of the strip-like substrate.

9. The display device according to claim 8, wherein, by attachment of the plurality of strip-like light sources to the frame, heat from the light-emitting elements arranged in the units is allowed to be conducted to the frame through through-holes of the plurality of strip-like light sources, and through heat releasing layers each provided on a back surface which is opposite to a front surface on which the light-emitting elements are arranged.

10. The display device according to claim 8, wherein, in the strip-like light source of the light emitting device, reflow is performed for an electrical connection to the plurality of units and an connection used for heat conduction from the plurality of units.