CN105068313A - Blue-ray LD backlight module and display device - Google Patents

Abstract

The invention discloses a blue-ray LD backlight module. The module comprises blue-ray LD laser sources, light scattering mechanisms, a light guide plate and a baffle board; each blue-ray LD laser source is arranged at one end of the corresponding light scattering mechanism, and the blue-ray LD laser sources emit laser toward the light scattering mechanisms; the light scattering mechanisms are arranged on the side face of the light guide plate, and the light scattering mechanisms scatter the laser emitted by the laser sources to the light guide plate; the light guide plate comprises an incident face, a reflecting face and an exit face, and the baffle board is arranged at the back side of the light guide plate. A blue-ray LD backboard illumination module structure is simple and compact in structure, small in size and low in weight, and by means of the structure, the module has the advantages of being low in equipment investment, simple in production process and high in product yield.

Description

A kind of blue light LD backlight module and display device

technical field

The invention relates to a backlight module and a display device, in particular to a blue LD backlight module and a display device, belonging to the technical field of semiconductor laser display.

Background technique

With the rapid development of the computer industry, consumer electronics such as mobile phones, digital cameras, portable notebooks, and tablet computers are all developing in the direction of multi-function and beauty. Among them, as an indispensable display interface and as a medium for human-computer interaction, It also brings great convenience to the operator. At present, most of the display screens of various consumer electronics are liquid crystal display panels, and the liquid crystal display panel itself does not have a light-emitting function, and a backlight module must be installed below it to provide the surface light source required by the liquid crystal panel, so that the liquid crystal panel has a display effect, and at the same time Get enough brightness and contrast.

Laser display has the advantages of large color gamut, high color saturation, energy saving and environmental protection, and long life. It is considered to be a new generation of display technology after black and white, color, and digital high-definition. In terms of laser display, there are many researches on laser projection display technology, which is relatively mature; there are few researches on laser flat panel display technology. The performance of the backlight directly affects the color, brightness uniformity, power consumption and other performance indicators of the laser flat panel display device. The requirements for high brightness, good brightness uniformity and color rendering, thin shape, and low power consumption of the backlight are necessary. Professionals engaged in the liquid crystal industry at home and abroad have always attached great importance to the development of high-performance backlight products. Combining the advantages of laser display and liquid crystal flat panel display technology, researching the key technology of laser liquid crystal flat panel display not only has important academic significance, but also has great application value.

The backlight module is the light engine of the liquid crystal display and an indispensable part of the liquid crystal display. With the continuous development of technology, the requirements for its backlight module have the following aspects: small size, light weight, and compact structure. The light source should have high luminous efficiency, luminous uniformity and brightness. It must have higher color temperature and better color rendering. The backlight source used in some special occasions requires the characteristics of anti-vibration and shock resistance. Long service life, safety and environmental protection. The use of lasers for liquid crystal flat panel displays is to use lasers as the backlight module of the light source. It is necessary to convert the laser beam with high brightness, good directionality and good monochromaticity into a uniform surface light source. However, the current backlight modules that use laser sources to generate backlight have complex structures, large volumes, and difficult processing, which is not conducive to popularization and utilization.

Contents of the invention

The technical problem to be solved by the present invention is: how to simplify the structure of the backlight module, reduce the volume and weight.

In order to achieve the above-mentioned purpose of the invention, the present invention provides a blue LD backlight module, including: a blue LD laser source, a light scattering mechanism, a light guide plate and a reflector;

The blue LD laser source is arranged at one end of the light scattering mechanism, and irradiates laser light to the light scattering mechanism;

The light scattering mechanism is arranged on the side of the light guide plate, and the light scattering mechanism scatters the laser light emitted by the laser source to the light guide plate;

The light guide plate includes an incident surface, a reflective surface and an outgoing surface, and the reflective plate is arranged on the back of the light guide plate.

Wherein preferably, the light scattering mechanism includes a prism group and a fluorescent plate;

The fluorescent plate is arranged on the side of the light guide plate;

The prism group is arranged in the light emitting direction of the laser source;

The light output direction of the prism group is the same as the light input direction of the fluorescent plate;

The light emitting surface of the fluorescent plate is aligned with the light incident surface of the light guide plate.

Wherein preferably, the prism group includes a plurality of hollow triangular prisms arranged in the same direction, the bottom surface of the hollow triangular prisms is parallel to the light incident surface of the fluorescent plate, and the bottom surface has a total reflection film.

Wherein preferably, the section of the hollow triangular prism is an isosceles triangle, and the hollow section of the hollow triangular prism is an isosceles triangle;

The sides of the triangular section of the triangular prism are parallel to the triangular sides of the hollow triangular section of the hollow triangular prism.

Wherein preferably, the prism group includes a plurality of V-shaped prisms arranged in the same direction, and the opening surfaces of the V-shaped prisms are parallel to the light incident surface of the fluorescent plate.

Preferably, the light scattering mechanism includes a scattering member, the scattering member includes at least one light incident surface and at least one light exit surface, and the surface corresponding to the light exit surface is a reflective surface;

The light emitting surface is aligned with the incident surface of the light guide plate.

Wherein preferably, diffuse reflective dots are printed on the inner surface of the reflective surface.

Wherein preferably, the light-emitting surface of the diffuser is also coated with a phosphor powder stack.

Wherein preferably, the blue light LD laser source and the light scattering mechanism are four groups,

The four groups of blue LD laser sources are respectively arranged at the four corners of the light guide plate;

The four groups of light scattering mechanisms are respectively arranged on the four light incident surfaces of the light guide plate.

Among them, preferably, it also includes a diffusion sheet, a prism film, and an enhancement film;

The diffusion sheet, the prism film, and the enhancement film are sequentially stacked on the exit surface of the light guide plate.

On the other hand, the present invention also provides a display device, comprising a liquid crystal panel and a backlight module arranged behind the liquid crystal panel, and the backlight module is the above-mentioned backlight module.

The blue light LD backlight module and display device provided by the present invention have the advantages of simple structure, small volume, light weight, and compact blue light LD backplane lighting module structure, low equipment investment, simple production process, and high product yield.

Description of drawings

Fig. 1 is a schematic structural view of the backlight module of the first embodiment of the present invention;

Fig. 2 is a schematic structural diagram of the light scattering mechanism of the backlight module shown in Fig. 1;

Fig. 3 is a schematic structural diagram of a hollow triangular prism of the backlight module shown in Fig. 1;

Fig. 4 is the structural schematic diagram of the backlight module of the second kind of prism group embodiment;

Fig. 5 is a schematic diagram of the V-shaped prism structure of the backlight module described in Fig. 4;

Fig. 6 is a schematic structural diagram of the backlight module of the second embodiment;

FIG. 7 is a schematic structural diagram of a scattering member of the backlight module shown in FIG. 6;

FIG. 8 is a schematic diagram of the overall structure of the backlight module.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figures 1 and 3, a blue light LD backlight module of the present invention includes: a laser source 1, a light scattering mechanism 2, a light guide plate 3 and a reflector 4 (not shown in the figure); The laser source 1 is arranged at one end of the light scattering mechanism 2, and irradiates laser light to the light scattering mechanism 2; the light scattering mechanism 2 is arranged on the side of the light guide plate 3, and the light scattering mechanism scatters the laser source 2 to the light guide plate 3; the light guide plate 3 includes an incident surface 31, a reflective surface 32 and an outgoing surface 33, and the reflective plate 4 is arranged on the back of the light guide plate 3; the laser source is a blue light LD. The backlight module provided by the present invention will be described in detail below.

Example 1

As shown in Figures 1 to 3, the light scattering mechanism 2 includes a prism group 21 and a fluorescent plate 22; the fluorescent plate 22 is arranged on the light incident surface 31 of the light guide plate 2; the prism group 21 is arranged on the In the light emitting direction of the laser source 1; the light emitting direction of the prism group 21 is the same as the light entering direction of the fluorescent plate 22; the light emitting surface of the fluorescent plate 22 is aligned with the light incident surface 31 of the light guide plate 3. As shown in FIG. 2 and FIG. 3 , the prism group includes a plurality of hollow triangular prisms 210 arranged in the same direction, and the triangular prism 210 includes at least one incident surface, one outgoing surface and one reflecting surface. The bottom surface of the hollow triangular prism 210 is parallel to the light incident surface of the fluorescent plate 22 , and the bottom surface 211 is pasted with a total reflection film to reduce light loss. As shown in Figure 3, the section of described hollow triangular prism 210 is isosceles triangle, the hollow section of described hollow triangular prism is isosceles triangle; . After the laser light is emitted from the blue LD laser source 1, part of the laser light is reflected on the incident surface of the first hollow triangular prism 210, and the rest of the laser light passes through the hollow triangular prism 210 and is emitted from the light exit surface of the hollow triangular prism, and the laser enters the second hollow triangular prism 210 . In this way, the laser light is reflected on the light-incident surface of each hollow triangular prism 210 in the prism group in turn, and is emitted from the light-emitting surface of the hollow triangular prism 210 to achieve the purpose of reflection. The laser light reflected from the prism group 21 enters the fluorescent plate 22, and the fluorescent plate 22 is coated with fluorescent powder. When the laser source is a blue LD laser source, the phosphors on the phosphor plate are green and red phosphors. The laser excites the fluorescent powder on the fluorescent plate 22 to make the fluorescent plate generate white light. White light enters from the incident surface of the light guide plate 3 . Preferably, the laser source 1 and the light scattering mechanism are arranged in four groups, and visible light is respectively incident on the four incident surfaces of the light guide plate 3 . The laser sources are arranged on the four corners of the backlight module. Every two laser sources 1 inject laser light at both ends of the prism group, and the laser light at both ends compensates each other through the two sides forming a certain angle.

As shown in Figure 4, as an alternative to the above-mentioned prism group 21, the structure of the blue LD backlight module shown in Figure 1 is basically the same, the difference is that the prism group 22 includes a plurality of V-shaped prisms 220 arranged in the same direction A glass plate coated with a total reflection film is placed at the opening of the V-shaped prism 220 to reduce light loss. The glass plate is parallel to the light incident surface of the fluorescent plate. Place a glass plate structure coated with a total reflection film instead as shown in Figure 5, the scattering mechanism formed by the prism group 22 formed by the V-shaped prism 220 is roughly similar to the scheme shown in Figures 1 to 3, and the laser source 1 is set At one or both ends of the light scattering mechanism 2, laser light is irradiated to the light scattering mechanism 2; The laser light reaches the light guide plate 3; After the laser light is emitted from the laser source 1, part of the laser light is reflected on the light incident surface of the first V-shaped prism 220, and the rest of the laser light passes through the V-shaped prism 220 and is emitted from the light-emitting surface of the hollow triangular prism, and the laser enters the second V-shaped prism 220. In this way, the laser light is reflected on the light incident surface of each V-shaped prism 220 in the prism group in turn, and is emitted from the light-emitting surfaces of the two V-shaped prisms 220 to achieve the purpose of scattering. The laser light reflected from the prism group 21 enters the fluorescent plate 22, and the fluorescent plate 22 is coated with fluorescent powder. When the laser source is a blue LD laser source, the phosphors on the phosphor plate are green and red phosphors. The laser excites the fluorescent powder on the fluorescent plate 22 to make the fluorescent plate generate white light, and the white light enters from the incident surface of the light guide plate 3 .

Example 2

As shown in Figure 5, this embodiment is roughly similar to the solution of Embodiment 1. The light scattering mechanism 2 includes a scattering member, and the scattering member includes at least one light incident surface and at least one light exit surface, and the surface opposite to the light exit surface is a reflective surface; the light emitting surface is aligned with the incident surface of the light guide plate. Diffuse reflective dots 25 are printed on the inner surface of the reflective surface. The light emitting surface of the scattering member is also coated with phosphor powder lamination. When the laser source is a blue LD laser source, the phosphors on the phosphor plate are green and red phosphors. The laser source 1 is arranged at one or both ends of the light scattering mechanism 2, and irradiates laser light to the light scattering mechanism 2; the light scattering mechanism 2 is arranged on the side of the light guide plate 3, and the light scattering mechanism radiates The laser light emitted by the laser source 1 reaches the light guide plate 3 ; After the laser is emitted from the laser source 1, the laser enters the diffuser from the light-incident surface of the diffuser, and the laser is reflected inside the diffuser. When the laser meets the diffuse reflection dots on the reflective surface, diffuse reflection occurs, and the diffusely reflected laser is The light-emitting surface is emitted, and since the light-emitting surface is coated with a fluorescent coating, the laser excites the fluorescent powder to make the fluorescent plate generate white light, and the white light enters from the incident surface of the light guide plate 3 .

As shown in Figure 6, in another embodiment provided by the present invention, the blue LD backlight module further includes a diffusion sheet 5, a prism film 6, and an enhancement film 7; the diffusion sheet 5, the prism film 6, the The brightness enhancement film 7 is sequentially stacked on the exit surface of the light guide plate 3 . The reflector 4 , the light guide plate 3 , the diffuser 5 , the prism film 6 , and the enhancement film 7 are sequentially stacked to form a complete backlight module. The prism film 6 can increase the directionality of the outgoing light; the brightness enhancement film 7 can increase the luminance of the liquid crystal panel by at least one time; the diffusion sheet 5 can reduce the directivity of the outgoing light of the light guide plate, and make the outgoing light uniform. In this embodiment, the light guide plate can select any one of the light scattering mechanisms 2 in the above-mentioned embodiment 1 and embodiment 2 to complete the incidence of light on the incident surface.

As shown in Figure 6, in order to further reflect the superiority of the blue LD backlight module provided by the present invention, the present invention also provides a display device, which includes a liquid crystal panel 8 and a backlight module arranged behind the liquid crystal panel , the backlight module is the backlight module in the above embodiment.

In summary, the blue LD backlight module and display device provided by the present invention have a simple structure, small size, light weight, and a compact blue LD backplane lighting module structure, which has the advantages of low equipment investment, simple production process, and finished products. The advantage of high rate.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (10)

1. a blue light LD backlight module, is characterized in that, comprising: blue light LD lasing light emitter, light scattering means, light guide plate and reflecting plate;

Described blue light LD lasing light emitter is arranged on described light scattering means one end, to light scattering means irradiating laser;

Described light scattering means is arranged on the side of described light guide plate, and the laser that described in described light scattering means scattering, lasing light emitter sends is to light guide plate;

Described light guide plate comprises the plane of incidence, reflecting surface and exit facet, and described reflecting plate is arranged on the back side of described light guide plate.

2. backlight module as claimed in claim 1, it is characterized in that, described light scattering means comprises prism group, fluorescent plate;

Described fluorescent plate is arranged on the side of described light guide plate;

Described prism group is arranged on the light direction of described lasing light emitter;

The light direction of described prism group and described fluorescent plate to enter light direction identical;

The exiting surface of described fluorescent plate aligns with the incidence surface of described light guide plate;

Described fluorescent plate scribbles red, green fluorescence powder lamination.

3. backlight module as claimed in claim 2, it is characterized in that, described prism group comprises multiple hollow prism arranged in the same way, and the bottom surface of described hollow prism is parallel with the incidence surface of described fluorescent plate, and there is total reflection film described bottom surface.

4. backlight module as claimed in claim 3, is characterized in that, the cross section of described hollow prism is isosceles triangle, the hollow section of described hollow prism is isosceles triangle;

The each limit of section triangle of described prism is parallel with each limit of hollow section triangle of described hollow prism.

5. backlight module as claimed in claim 2, it is characterized in that, described prism group comprises multiple V-arrangement prism arranged in the same way, and the opening surface of described V-arrangement prism is parallel with the incidence surface of described fluorescent plate.

6. backlight module as claimed in claim 1, it is characterized in that, described light scattering means comprises diffuser, and described diffuser comprises at least one incidence surface and at least one exiting surface, and one side corresponding to exiting surface is reflecting surface;

Described exiting surface aligns with the plane of incidence of described light guide plate.

7. backlight module as claimed in claim 6, it is characterized in that, described reflecting surface inside surface is printed with diffuse reflection site; The exiting surface of described diffuser also scribbles fluorescent powder lamination.

8. backlight module as claimed in claim 6, it is characterized in that, described blue light LD lasing light emitter, light scattering means are four groups,

Described four groups of blue light LD lasing light emitters are separately positioned on four angles place of described light guide plate;

Described four groups of light scattering means are separately positioned on four incidence surfaces of described light guide plate.

9. the backlight module as described in claim 1-8 any one, is characterized in that, also comprises diffusion sheet, prism film, bright enhancement film;

Described diffusion sheet, described prism film, described bright enhancement film sequentially stack on the exit facet of described light guide plate.

10. a display device, is characterized in that, comprise liquid crystal panel and the backlight module being arranged on described liquid crystal panel rear, described backlight module is backlight module according to claim 9.