JP2012089445A - Backlight module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backlight module capable for realizing an easy assembly work, a low occurrence ratio of failed items, and moreover cost-saving and weight-saving.SOLUTION: In the backlight module, an emitted light from a light emitting means with a plurality of light emitting units fitted on one face of a circuit board is received at an incident surface of a light guide means having an incident surface, an emitting surface, and a reflection surface and then is guided to diffuse into planar light, and then, is emitted to the outside of a fitting frame at the emitting surface. In the fitting frame, there are provided a first auxiliary reflection means which is made of a plastic material and moreover has a first auxiliary reflection surface facing the incident surface and is arranged and structured so as to be inserted into the plurality of light emitting units of the light emitting means, and a second auxiliary reflection means which is made of the plastic material and moreover is arranged and structured so as to have a second auxiliary reflection surface facing a circumference in the emitting surface, neighboring the incidence surface.

Description

  The present invention relates to a backlight module, and more particularly, to a backlight module that is suitable for using a light emitting diode and has a reduced weight.

  In the liquid crystal display, a cold cathode tube is mainly used as a light emitting means for a backlight module, but in recent years, white LEDs which are easily reduced in size have been adopted.

  However, it is necessary to change the design in order to replace the cold-cathode tube, which is a line light source, with the LED, which is a point light source. For example, the LEDs must be arranged in a row and held together with the reflecting means.

  By the way, Patent Document 1 proposes a flexible reflecting means formed by applying a reflective paint to a polyethylene terephthalate sheet. If such a configuration is adopted for the reflection means of the backlight module, the light emission of the LED can be concentrated and sent more to the light guide means of the backlight module. However, since it has flexibility, it is deformed. It is easy to form a configuration that can stably hold members in which LEDs are arranged in a row. For this reason, the configuration of the backlight module shown in FIG. 5 has been proposed in the industry.

  The backlight module 1 includes a metal frame 11, a metal supporter 12 disposed in the metal frame 11, having an opening on one side and having a U-shaped cross section, and a bottom surface of the metal supporter 12 (that is, the above-mentioned The light emitting means 13 attached to the surface on the opposite side of the opening) and the bottom wall 145 on the opposite side of the opening having a U-shaped cross section, and the light emitting portion 132 of the light emitting means 13. The reflective sheet 14 is formed so as to have a through-hole 143 that exposes the light source and is sandwiched in the metal supporter 12 and supported by the metal supporter 12 so that the side wall 145 contacts the circuit board 131 of the light emitting means 13. And a plastic frame 16 coupled to the metal frame 11, and the metal frame 11 and the plastic frame 16. And a guiding means 15 facing the light emitting portion 132 of the unit 13. The reflective sheet 14 includes a polyethylene terephthalate layer 141 and a reflective paint layer 142, and the reflective paint layer 142 can reflect light from the light emitting part 132 of the light emitting means 13 to the light guiding means 15. The polyethylene terephthalate layer 141 is applied and formed on the surface facing the light emitting portion 132 and the light guide means 15.

  With this configuration, since the reflective sheet 14 formed of a flexible material is supported by the metal supporter 12, assembly work is convenient and the occurrence rate of defective products can be effectively suppressed.

Taiwan Utility Model Notification No. M344443 Specification

  In the configuration shown in FIG. 5, the problem that the flexible reflecting means is easily deformed can be solved, but there is a problem that the weight is increased because a lot of metal materials are used. In addition, since the cost of the metal raw material is relatively high and fluctuates, there is a problem in terms of stable supply.

  In view of the above problems, the present invention further improves a conventional LED backlight module, and includes a light emitting device that can be assembled easily, has a low incidence of defective products, and can be reduced in cost and weight, and the light emitting device. The purpose is to provide a backlight module.

To achieve the above object, according to the present invention, in the installation frame, a plurality of light emitting units are attached to one surface of the circuit board at the incident surface of the light guide means having an incident surface, an output surface, and a reflecting surface. A backlight module that guides the light emitted from the light emitting means to be dispersed into planar light, and emits the light from the installation frame at the exit surface.
A first auxiliary reflection made of a plastic material and having a first auxiliary reflection surface facing the incident surface and arranged to be inserted through the plurality of light emitting units of the light emitting means. And a second auxiliary reflecting means made of a plastic material and arranged to have a second auxiliary reflecting surface facing a peripheral edge adjacent to the incident surface of the emission surface. Provided is a backlight module in which an auxiliary reflection mechanism is provided.

  In the backlight module, the first auxiliary reflection means and the second auxiliary reflection means are integrally configured, and the auxiliary reflection surfaces of the first auxiliary reflection means and the second auxiliary reflection means can be configured to be orthogonal to each other. .

  In the backlight module, the first auxiliary reflection means includes a first support sheet and a first reflection film attached to the first support sheet, and the first auxiliary reflection surface. Comprises the exposed surface of the first reflective film, and the second auxiliary reflective means comprises a second support sheet and a second reflective film affixed to the second support sheet. The second auxiliary reflection surface may be configured to be an exposed surface of the second reflection film.

  In the backlight module, the first auxiliary reflection means may be configured to be a reflection film that is applied and formed on the one surface of the circuit board.

  In the backlight module, the second auxiliary reflection means may be configured to be a reflection film interposed between the installation frame and a peripheral edge adjacent to the incident surface on the emission surface.

  In the backlight module, it is preferable that a reflection sheet is interposed between the installation frame and the reflection surface.

  The backlight module of the present invention having the above configuration does not require a step of installing a circuit board and a reflection sheet of the light emitting means in the metal supporter, makes assembly work easier, reduces the occurrence rate of defective products, and reduces the cost. A backlight module that can be reduced in weight and weight can be provided.

It is an exploded view in which the structure of 1st Embodiment of the backlight module of this invention is shown. It is sectional drawing by which the structure of 1st Embodiment of the backlight module of this invention is shown. It is sectional drawing by which the structure of 2nd Embodiment of the backlight module of this invention is shown. It is sectional drawing by which the structure of 3rd Embodiment of the backlight module of this invention is shown. It is sectional drawing by which an example of a structure of the conventional backlight module is shown.

  Hereinafter, preferred embodiments of the backlight module of the present invention will be described in detail with reference to the drawings.

  1 and 2 show the configuration of the first embodiment of the backlight module of the present invention, FIG. 1 is an exploded view, and FIG. 2 is a cross-sectional view.

  As shown in FIGS. 1 and 2, the backlight module of the present invention is assembled by the first frame body 31 and the second frame body 32, and an opening is formed on the second frame body 32 side. In the installation frame 3, the light emitting unit 51 has a light incident means 511 having a light incident surface 511, a light emission surface 513, and a reflective surface 512, and a plurality of light emitting units 42 are attached to one surface 412 of the circuit board 41. The backlight module guides the light emitted from the means 4 so as to be dispersed into the planar light and emits the light from the opening of the installation frame 3 which is the light emission surface 513. Further, a reflection sheet 63 is interposed between the first frame body 31 and the reflection surface 512 of the light guide means 51.

  The installation frame 3 further includes a first auxiliary reflecting surface 614 made of a plastic material and facing the incident surface 511 of the light guide means 51, and a plurality of light emitting units 42 of the light emitting means 4. The first auxiliary reflecting means 61 formed with a plurality of through holes 613 inserted corresponding to each of the first auxiliary reflecting means 61 and made of a plastic material and adjacent to the incident surface 511 on the exit surface 513 of the light guide means 51 An auxiliary reflection mechanism comprising: a second auxiliary reflection means 62 arranged and configured to have a second auxiliary reflection surface 624 facing a portion covered by the second frame body 32 at a peripheral edge thereof. 6 is incorporated.

  In the first embodiment, the first auxiliary reflection means 61 includes a first support sheet 611 and a first reflection film 612 attached to the first support sheet 611. The reflective surface 614 is defined by the exposed surface of the first reflective film 612. The second auxiliary reflection means 62 includes a second support sheet 621 and a second reflection film 622 attached to the second support sheet 621, and the second auxiliary reflection surface 624 includes the second auxiliary reflection surface 624. This is defined by the exposed surface of the reflective film 622.

  Further, the first auxiliary reflection means 61 and the second auxiliary reflection means 62 are integrally formed, and the first auxiliary reflection surface 614 and the second auxiliary reflection surface 624 included in each of them are mutually connected. It can be configured to be orthogonal.

FIG. 3 shows the configuration of the second embodiment of the backlight module of the present invention.
As shown in the drawing, the second embodiment has a configuration similar to that of the first embodiment, and the difference will be described in detail below.

  In the second embodiment, unlike the first embodiment, the first auxiliary reflecting means 61 and the second auxiliary reflecting means 62 are arranged not independently but independently.

  The first auxiliary reflection means 61 is configured by the first support sheet 611 and the first reflection film 612 attached to the first support sheet 611 as in the first embodiment. The second auxiliary reflecting means 62 is between the second frame body 32 and the portion covered by the second frame body 32 at the periphery adjacent to the incident surface 511 on the exit surface 513 of the light guide means 51. It is comprised by the reflective film 623 currently interposed in.

FIG. 4 shows the configuration of the third embodiment of the backlight module of the present invention.
As shown in the figure, the third embodiment has a configuration similar to that of the second embodiment, and the difference will be described in detail below.

In the third embodiment, the first auxiliary reflecting means 61 is constituted by a reflecting film 615 applied and formed on the one surface 412 of the circuit board 41 of the light emitting means 4.
As with the second embodiment, the second auxiliary reflecting means 62 is covered with the second frame body 32 at the peripheral edge adjacent to the incident surface 511 on the exit surface 513 of the light guiding means 51. The reflection film 623 is interposed between the portion and the second frame body 32.

  The backlight module of the present invention having the above-described configuration does not require a process of installing a circuit board and a reflection sheet of a light emitting means in a metal supporter, makes assembly work easier, reduces the incidence of defective products, and lowers the cost. A backlight module that can be reduced in weight and weight can be provided.

3 Installation frame 31 1st frame body 32 2nd frame body 4 Light emission means 41 Circuit board 412 One surface 42 Light emission unit 51 Light guide means 511 Incident surface 512 Reflection surface 513 Output surface 6 Auxiliary reflection mechanism 61 1st auxiliary reflection means 611 First support sheet 612 First reflection film 613 Through hole 614 First auxiliary reflection surface 62 Second auxiliary reflection means 621 Second support sheet 622 Second reflection film 624 Second auxiliary reflection surface 63 Reflection Sheet

Claims (6)

In the installation frame, the light incident means of the light guide means having an entrance surface, an exit surface, and a reflection surface receives light emitted from the light emitting means in which a plurality of light emitting units are attached to one surface of the circuit board, and then becomes planar light A backlight module that guides the light so that it is dispersed and emits the light out of the installation frame at the light exit surface;
In the installation frame,
A first auxiliary reflection made of a plastic material and having a first auxiliary reflection surface facing the incident surface and arranged to be inserted through the plurality of light emitting units of the light emitting means. Means,
A second auxiliary reflecting means made of a plastic material and arranged so as to have a second auxiliary reflecting surface facing a peripheral edge adjacent to the incident surface on the emission surface;
A backlight module comprising: an auxiliary reflection mechanism including:   2. The backlight according to claim 1, wherein the first auxiliary reflection means and the second auxiliary reflection means are integrally formed, and the auxiliary reflection surfaces of the first auxiliary reflection means and the second auxiliary reflection means are orthogonal to each other. module. The first auxiliary reflection means includes a first support sheet and a first reflection film attached to the first support sheet, and the first auxiliary reflection surface includes the first auxiliary reflection surface. It consists of the exposed surface of the reflective film,
The second auxiliary reflection means includes a second support sheet and a second reflection film attached to the second support sheet, and the second auxiliary reflection surface includes the second auxiliary reflection surface. 2. The backlight module according to claim 1, comprising an exposed surface of a reflective film.   2. The backlight module according to claim 1, wherein the first auxiliary reflection means is a reflection film applied and formed on the one surface of the circuit board.   2. The backlight module according to claim 1, wherein the second auxiliary reflection means is a reflection film interposed between the installation frame and a peripheral edge of the emission surface adjacent to the incident surface.   The backlight module according to claim 1, wherein a reflection sheet is interposed between the installation frame and the reflection surface.

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