KR200446081Y1 - Light source structure of backlight module - Google Patents

Abstract

The light source structure of the backlight module includes a casing, a heat sink, a plurality of light generators, a first reflecting element and a second reflecting element. When the light emitting element of the light generator emits light, the spot light of the light emitting element passes through the optical lens in the light pipe and is converted into linear light to be projected onto the inclined surface of the first reflecting element. The inclined surface converts linear light into planar light to be projected from the opening of the casing to the inclined surface of the second reflective element. The inclined surface of the second reflecting element guides the planar light to the light guide plate so that the light of the light guide plate is uniformly diffused to provide sufficient brightness to the light guide plate.

Casing, Heat Sink, Light Source Generator, Reflector, Optical Lens, Inclined Surface

Description

LIGHT SOURCE STRUCTURE OF BACKLIGHT MODULE}

1 is a schematic diagram of a conventional backlight module structure.

2 is a schematic diagram of a conventional backlight module structure of a second type;

3 is a schematic diagram of a conventional backlight module structure of a third type;

4 is a schematic diagram of a conventional fourth type backlight module structure;

5 is a bottom view of the light source structure of the present invention.

FIG. 6 is a sectional view taken at cross section 6-6 shown in FIG. 5; FIG.

7 is a schematic view of the light path of the light source structure of the present invention.

8 is a schematic view of a first preferred embodiment of the present invention.

9 is a schematic view of a second preferred embodiment of the present invention.

10 is a schematic view of a third preferred embodiment of the present invention.

11 is a schematic view of a fourth preferred embodiment of the present invention.

12 is a schematic view of a fifth preferred embodiment of the present invention.

The present invention relates to a backlight module, and more particularly, to a backlight module for reflecting a light source to a light guide plate by multiple reflections.

Since a liquid crystal display (LCD) is not a self-luminous display device, an external light source is essential to achieve a display effect. Most liquid crystal displays employ a backlight module to provide a uniform liquid crystal display panel and a high brightness light source. The basic principle of an LCD is to employ a spot light source or a linear light source, and effectively convert the spot light source or linear light source into a flat light source to provide a flat light source emitting product having high brightness and uniform brightness.

In general, the backlight module can be classified into two types, namely, the front light type and the back light type, and the back light type can be classified according to the specification and the lamp position and developed into the following structure. Can be.

1. The side light emitting structure shown in Fig. 1 installs a cold cathode fluorescent lamp 1a on the side of the light guide plate 2a, and the light guide plate 2a adopts an injection molding printless design. The light emitting structure is typically used for small to medium sized backlight modules of less than 18 inches, and the side emitting light source design is characterized by light, thin, narrow frame and low power consumption, and therefore mobile phones, personal digital assistants (PDAs) and It can be used as a light source for notebook computers.

2. The back light emitting structure shown in Fig. 2 is provided with a cold cathode fluorescent lamp 1a behind the light guide plate 2a. Since the backlight module is large, the side light emitting structure can no longer maintain the advantages of weight, power consumption and brightness, and accordingly, a back light emitting structure in which a cold cathode fluorescent lamp 1a is provided behind the light guide plate 2a has been developed. The back light emitting structure can be applied to portable LCD monitors and LCD TVs with reduced requirements.

In recent years, light emitting diodes (LEDs) have become increasingly popular due to their compact size, low power consumption and long life expectancy and are gradually replacing traditional light bulbs. For example, LEDs are widely used in traffic lights, automotive signal lights, flash lights, mobile phones, lamps and large outdoor billboards. Some light sources of current backlight modules employ LEDs, and as shown in Figs. 3 and 4, the LEDs 3 are typically mounted on the side or back of the light guide plate 2a.

In practice, the light source generated by the electrically connected LED 3a affects the luminous efficiency of the LED, and insufficient heat dissipation prevents the LED 3a from meeting its specifications. To solve the above problem, some manufacturers reduce the input current (known as load reduction) to 60% of the specified value so that the brightness of each LED 3a falls below 60% of the specified value. More light emitting diodes are added to meet the brightness requirements, but this arrangement is complex and expensive to manufacture.

In view of the above drawbacks of the prior art, the inventors of the present invention have finally developed a light source structure of a backlight module based on many years of experience in the related industry for performing experiments and modifications.

Therefore, the present invention is to provide a light source structure that reflects light to the light guide plate by multiple reflections in order to reduce the number of light emitting diodes used and to ensure that the luminous efficiency of the light emitting diodes meets the specification requirements.

In order to achieve the above object, the light source structure of the backlight module according to the present invention includes the following elements.

The casing has an accommodating space for accommodating a plurality of light generators and reflective elements, the side of the casing having an opening and an installation slot, the opening and the installation slot being interconnected with the accommodation space.

The heat sink includes a heat conduction element and a heat dissipation fin, and the heat conduction element is installed in the installation slot.

A plurality of light generators are provided on the heat conducting element, and the light generators have light emitting elements provided on the substrate. The substrate is installed on the thermally conductive element. A reflector is provided above the light emitting element to reflect light from the light emitting element, and a light pipe is provided between the reflector and the substrate to allow light from the light emitting element to pass therethrough, and a plurality of optical inside the light pipe. A lens is installed, and the optical lens focuses spot light of the light emitting element to produce an output of linear light.

The first reflecting element is provided in the receiving space, the first reflecting element has an inclined surface perpendicular to the plurality of light generators, and the thickness between the bottom surface and the inclined surface of the first reflecting element is thinner at a position close to the opening. Thus, the inclined surface and the opening are provided corresponding to each other, and the inclined surface can reflect the linear light guided by the light pipe as planar light to be projected out of the casing.

The second reflecting element has an inclined surface provided corresponding to the side surface of the light guide plate, and the inclined surface has a serrated surface that refracts light, so that the light reflected from the first reflecting element to the second reflecting element onto the light guide plate. It can be diffused to achieve uniform projection of light.

Features of the present invention that are believed to be new are particularly described in the claims. However, the invention itself can be best understood by reference to the following detailed description of the invention which describes embodiments of the invention in conjunction with the accompanying drawings.

The technical features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings. The drawings are provided for reference and illustration only and are not intended to limit the present invention.

Referring to FIGS. 5 and 6, respectively, which are a bottom view of the light source structure of the present invention and a cross-sectional view taken in section 6-6 shown in FIG. 5, the light source structure 10 of the backlight module includes a casing 1 and a heat sink 2. ), A plurality of light generators 3 and a first reflecting element 4. The assembly is a light source structure having a heat dissipation effect and can convert spot light into linear light and linear light into planar light to be projected out of the casing 1.

The casing 1 has a storage space 11 for accommodating the plurality of light generators 3 and the reflecting elements 4, and the side of the casing 1 has an opening 12 and an installation slot 13. The opening 12 and the installation slot 13 are interconnected with the storage space 11.

The heat sink 2 includes a heat conduction element 21 and a heat dissipation fin 22 attached to the surface of the heat conduction element 21, and the heat conduction element 21 is provided on the installation slot 13. In the figures, the thermal conduction element 21 is a thermal diffusion or thermal conduction module.

The light generator 3 is provided on the heat conducting element 21, and each light generator 3 has a light emitting element 31 provided on the substrate 32. The substrate 32 is provided on the heat conductive element 21. Each of the light generators 3 further includes a reflector 33 disposed above the light emitting element 31 to reflect the light emitted from the light emitting element 31 within 90 degrees. Here, an outlet is formed between the reflector 33 and the substrate 32. The light pipe 34 is provided at the outlet between the reflector 33 and the substrate 32 so that light from the light emitting element 31 passes. The light pipe 34 forms a light channel by the reflector 33. A plurality of optical lenses 35 are provided in the light pipe 34 to transmit light from the light emitting element 31 in a linear type. In the figures, the light emitting element 31 is a light emitting diode (LED), and the light generated by the light emitting element 31 is transferred from the first reflecting element 4 to the second reflecting element 5 (shown in FIG. 8). And then to a light guide plate (not shown). The shorter the light path, the lower the wattage used for the light emitting diodes (the lower the brightness). The longer the light path, the greater the number of watts used for the light emitting diodes (the higher the brightness). In addition, the optical lens 35 is a convex lens.

The first reflecting element 4 is provided in the storage space 11, and the first reflecting element 4 has an inclined surface 41 perpendicular to the plurality of light generators 3, and has a bottom surface 42. A thinner end between the inclined surfaces 41 of the first reflective element 4 is provided adjacent to the opening 12, whereby the inclined surface 41 and the opening 12 are provided to correspond to each other, and the inclined surface 41 is inclined. May also reflect linear light guided by the light pipe 34 to the outside of the casing 1 as planar light. In the figures, the first reflecting element 4 is a body of right triangles.

Referring to FIG. 7 for a schematic view of the light path of the light source structure of the present invention, when the light emitting element 31 of the light source structure 10 emits light, the reflector 33 is spot-shaped light 36 from the light emitting element 31. ) And reflector 33 will convert spot-shaped light 36 from light emitting element 31 to linear light 37 by optical lens 35 in light pipe 34. The linear light 37 is projected onto the inclined surface 41 of the first reflecting element 4, the inclined surface 41 projecting the linear light 37 through the opening 12 out of the casing 1. Convert to planar light 38 to be.

When the light emitting element 31 emits light, the generated heat is directly absorbed by the heat conducting element 21 of the heat sink 2, transferred to the heat dissipation fin 22, and radiated to the outside from the heat dissipation fin 22. The light emitting element 31 effectively dissipates heat so that the luminous efficiency of the light emitting element 31 meets the specification requirements and the life expectancy of the light emitting element 31 is extended.

Referring to FIG. 8 for a schematic view of a first preferred embodiment of the present invention, a small backlight module includes a light guide plate 20 and a light source structure 10 mounted on the side of the light guide plate. The light source structure 10 further includes a second reflecting element 5 provided on the side of the light guide plate, and the second reflecting element 5 has an inclined surface 51 provided corresponding to the side of the light guide plate, and the inclined surface ( 51 has a serrated surface 52 that reflects light, so that light can be diffused to achieve uniform light. The thin end between the bottom surface 53 and the inclined surface 51 of the second reflecting element 5 is arranged close to the opening 12, so that the inclined surface 51 and the opening 12 correspond to each other. In the figure, the second reflecting element 5 is a body of right triangles.

When the light emitting element 31 of the light source structure 10 emits light, the reflector 33 reflects the spot-type light 36 from the light emitting element 31, and then the optical lens 35 in the light pipe 34. Condenses spot-type light 36 and converts it into linear light 37 to be projected onto the inclined surface 41 of the first reflective element 4, and the inclined surface 41 is then linear light 37 Is converted into planar light 38 to be projected onto the inclined surface 51 of the second reflecting element 5 through the opening 12, and the inclined surface 51 allows the light to be uniformly diffused in the light guide plate 20. To guide the plane light 54 to the light guide plate 20.

Referring to FIG. 9 for a second preferred embodiment of the present invention, the backlight module is substantially the same as the backlight module illustrated in FIG. 8, except that the second preferred embodiment has a plurality of light source structures 10. During the transmission of light, the brightness of the light guide plate 20 at a distance from the light source is insufficient, so that another light source structure 10 is typically added to the light guide plate 20. When the light emitting element 31 of the light source structure 10 emits light, the reflector 33 reflects the spot-shaped light 36 of the light emitting element 31, and then the optical lens 35 in the light pipe 34 is The spot light 36 is collected and converted into linear light 37 to be projected onto the inclined surface 41 of the first reflecting element 4, and the inclined surface 41 is then converted into the linear light 37. Is converted into planar light 38 to be projected onto the inclined surface 51 of the second reflective element 5 through the opening 12. The inclined surface 51 guides the planar light 54 to the light guide plate 20 and allows the light inside the light guide plate 20 to be uniformly diffused so that the light guide plate 20 can exhibit sufficient brightness.

Referring to FIG. 10 for the third preferred embodiment of the present invention, the large-scale backlight module is provided with a light source structure 10 on each of the four sides of the light guide plate 20, so that when the light emitting element 31 emits light, the reflector 33 reflects the spot light 36 of the light emitting element 31, and the optical lens 35 in the light pipe 34 condenses the spot light 36, thereby Converted into linear light 37 to be projected onto the inclined surface 41, the inclined surface 41 directs the linear light 37 through the opening 12 onto the inclined surface 51 of the second reflective element 5. Is converted into planar light 38 to be projected on, and then the inclined surface 51 guides the planar light 54 to the light guide plate 20 so that the light inside the light guide plate 20 can be uniformly diffused and the large light guide plate 20 may exhibit sufficient brightness.

Referring to FIG. 11 for a fourth preferred embodiment of the present invention, the large-scale backlight module installs a light source structure 10 on each side of the light guide plate 20, and includes a plurality of light generators 3 in the light source structure 10. In addition, the light generated by the light emitting element 31 is transmitted from the first reflecting element 4 to the second reflecting element 5 and then to the light guide plate 20. The shorter the light path, the lower the wattage used for the light emitting diodes (the lower the brightness). The longer the light path, the greater the number of watts used for the light emitting diodes (the higher the brightness).

When the light emitting element 31 emits light, the reflector 33 reflects the spot light 36 of the light emitting element 31, and the optical lens 35 in the light pipe 34 condenses the spot light 36. Thereby converting the linear light 37 to be projected onto the inclined surface 41 of the first reflecting element 4, wherein the inclined surface 41 transmits the linear light 37 through the opening 12 to the second reflecting element. (5) is converted into planar light 38 to be projected onto the inclined surface 51, and the inclined surface 51 guides the planar light 54 to the light guide plate 20, whereby the large light guide plate 20 has sufficient brightness. The light inside the light guide plate 20 may be uniformly diffused to show.

Referring to FIG. 12 of a fifth preferred embodiment of the present invention, a large backlight module may install light source structures 10 and 10 'on two side surfaces of the light guide plate 20. When the light emitting elements 31, 31 'of the light generators 3, 3' emit light, the reflectors 33, 33 'reflect the spot light 36, 36' of the light emitting elements 31, 31 '. , The optical lenses 35, 35 ′ of the light pipes 34, 34 ′ collect spot light 36, 36 ′, so that the inclined surfaces 41, 41 ′ of the first reflecting elements 4, 4 ′. Converted into linear light 37, 37 'to be projected onto, and the inclined surfaces 41, 41' convert the linear light 37, 37 'through casings 1, 1 through openings 12, 12'. Is converted into planar light 38, 38'to be projected onto the inclined surfaces 51, 51 'of the second reflecting elements 5, 5' outside the '), and the inclined surfaces 51, 51' are planar By guiding the light 54, 54 ′ to the light guide plate 20, the light inside the light guide plate 20 can be uniformly diffused so that the large light guide plate 20 has sufficient brightness.

In order to reduce the number of light emitting diodes used and to ensure that the luminous efficiency of the light emitting diodes meets specification requirements, a light source structure is provided which reflects light to the light guide plate by multiple reflections.

The invention is illustrated with reference to the preferred embodiments and is not intended to limit the patent scope of the invention. Various substitutions and modifications are suggested in the above description, and other substitutions and modifications are possible by those skilled in the art. Therefore, all such replacements and modifications are intended to be included within the scope of the invention as defined in the utility model registration claims.

Claims (14)

In the light source structure of the backlight module provided on the side of the light guide plate, A casing provided on a side surface of the light guide plate, the housing having an accommodation space therein, and having an opening connected to the storage space, the casing being provided on the side; It is installed in the storage space, Board; A light emitting element provided on the substrate; A reflector disposed above the light emitting element so as to reflect light from the light emitting element within 90 degrees; And A plurality of light generators comprising a light pipe connected between the reflector and the substrate to allow light from the light emitting element to pass therethrough; A first reflecting element provided in said storage space and having an inclined surface perpendicular to said plurality of light generators and provided corresponding to said opening; And A second reflecting element provided on a side surface of the light guide plate, the second reflecting element having a sloped surface corresponding to the light guide plate and the opening; The light pipe collects spot-type light of the light emitting element and converts it into linear light to be projected onto the inclined surface of the first reflective element, wherein the inclined surface of the first reflective element converts the linear light into the opening. A light source structure of a backlight module to convert the planar light to be projected onto the inclined surface of the second reflecting element, the inclined surface of the second reflecting element to guide the planar light to the light guide plate. The method of claim 1, The light emitting device is a light source structure of the backlight module is a light emitting diode. The method of claim 2, Light generated by the light emitting element is guided from the first reflecting element to the second reflecting element and then to the light guide plate, and the shorter the moving distance of the light, the lower the number of watts used for the light emitting diode, and the light movement. The longer the distance is, the light source structure of the backlight module that the number of watts used for the light emitting diode increases. The method of claim 1, The light pipe has a light source structure of a backlight module provided with a plurality of corresponding optical lenses therein. The method of claim 4, wherein And the optical lens is a convex lens. The method of claim 1, The first reflective element is a light source structure of the backlight module is a body of a right triangle. The method of claim 1, The inclined surface of the first reflective element reflects the linear light guided by the light pipe and converts the linear light into planar light to be projected out of the casing. The method of claim 1, And the inclined surface of the second reflecting element has a serrated surface for reflecting light. The method of claim 1, The second reflective element is a light source structure of the backlight module is a body of a right triangle. The method of claim 1, The casing has an installation slot on its side, and a heat sink is installed in the installation slot. The method of claim 10, The heat sink has a heat conduction element connected to the installation slot, and the surface of the heat conduction element is a light source structure of the backlight module in contact with the substrate of the light emitting element. The method of claim 11, And the heat conductive element has a heat dissipation fin attached to another surface of the heat conductive element. The method of claim 11, The thermally conductive element is a light source structure of a backlight module which is a heat spreader. The method of claim 11, The heat conduction device is a light source structure of the backlight module is a heat conduction module.

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