LIGHT SOURCE MODULE AND ELECTRONIC DEVICE INCLUDING SAME

• US 20120230056A1
• Filed: 01/27/2010
• Published: 09/13/2012
• Est. Priority Date: 10/07/2009
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Nishioka, Sumito, Hanaoka, Tohru, Takayama, Takeshi
• Application Number:
  US12/737,792
• Publication Number:
  US 20120230056A1
• Time in Patent Office: Days
• US Class Current: 362/612
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0078 Side-by-side arrangements, e.g. for large area displays
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light

Abstract

A light source module of the present invention includes: a plurality of light guide bodies (21) provided in parallel to one another with respect to a longitudinal direction; light sources (30) each causing light to enter each of the plurality of light guide bodies from at least one end surface in a longitudinal direction of the each of the light guide bodies (21); a light source wiring boards (32) having the light sources (30) and lines provided thereon, the lines being for electrically connecting the light sources (30) and including positive potential lines and negative potential lines; and an LED driver circuit (40) for performing a drive for turning on the light sources (30). Each of the light sources (30) provided to the light guide bodies (21) are independently driven by the LED driver circuit (40) so that each of the light sources (30) is independently turned on. Among lines provided on the light source wiring board (32) connected to the light sources 30, at least two high potential anode lines (30a) is arranged to be a common line. This makes it possible to provide a light source module whose thickness can be reduced by reduction of a wiring area, and an electronic device including the light source module, in a case where a side edge light guide plate is divided into a plurality of blocks.

Claims

1. A light source module comprising:

a plurality of light guide bodies provided in parallel to one another with respect to a longitudinal direction;

light sources each causing light to enter each of the plurality of light guide bodies from at least one end surface in a longitudinal direction of the each of the light guide bodies;

a light source wiring board having the light sources and lines provided thereon, the lines being for electrically connecting the light sources and including positive potential lines and negative potential lines; and

a light source drive circuit for performing a drive for turning on the light sources,

the light sources provided for the plurality of light guide bodies being independently driven by the light source drive circuit so that each of the light sources is independently turned on,

the lines being arranged so that at least two high potential lines are arranged to be a common line, the lines being provided on the light source wiring board connected to the light sources.

2. The light source module as set forth in claim 1, wherein:

each of the light sources is made of a plurality of light emitting diodes; and

the plurality of light emitting diodes are connected such that groups of light emitting diodes connected in parallel are connected in series.

3. The light source module as set forth in claim 1, wherein:

the light source wiring board is provided to each of both end surfaces in the longitudinal direction of the plurality of light guide bodies, respectively;

the light source drive wiring board is provided so as to include a first light guide body group board and a second light guide body group board that are separate boards, the first light guide body group board and the second light guide body group board each extending over a plurality of light guide bodies; and

the light source drive circuit is provided to each of an end surface of the first light guide body group board and an end surface of the second light guide body group board, which end surfaces are opposite to opposed end surfaces of the first light guide body group board and the second light guide body group board, each of the opposed end surfaces facing the first light guide body group board or the second light guide body group board.

4. The light source module as set forth in claim 2, wherein:

the light source wiring board is provided to each of both end surfaces in the longitudinal direction of the plurality of light guide bodies, respectively;

the light source drive wiring board is provided so as to include a first light guide body group board and a second light guide body group board that are separate boards, the first light guide body group board and the second light guide body group board each extending over a plurality of light guide bodies; and

the light source drive circuit is provided to each of an end surface of the first light guide body group board and an end surface of the second light guide body group board, which end surfaces are opposite to opposed end surfaces of the first light guide body group board and the second light guide body group board, each of the opposed end surfaces facing the first light guide body group board or the second light guide body group board.

5. The light source module as set forth in claim 3, wherein:

the light source wiring board is provided with a connector for electrically connecting the light sources and the light source drive circuit, the connector being provided at one end section in a longitudinal direction of the light source wiring board.

6. The light source module as set forth in claim 4, wherein:

the light source wiring board is provided with a connector for electrically connecting the light sources and the light source drive circuit, the connector being provided at one end section in a longitudinal direction of the light source wiring board.

7. The light source module as set forth in claim 1, wherein:

the light source drive circuit sequentially turns off the light sources corresponding to the plurality of light guide bodies provided in parallel, the light sources being turned off in synchronization with one frame period of an externally inputted video signal.

8. The light source module as set forth in claim 1, wherein:

the light source drive circuit carries out PWM (pulse width modulation) light control independently for each of the light sources, by use of externally inputted PWM light control signals.

9. An electronic device comprising the light source module as set forth in claim 1.

10. An electronic device comprising the light source module as set forth in claim 7.

11. An electronic device comprising the light source module as set forth in claim 8.