CN100443995C - Multi-light source backlight module - Google Patents

Abstract

The invention discloses a backlight module with multiple light sources, which comprises a back plate, a first light emitting diode, a second light emitting diode and a light guide plate. The first light emitting diode and the second light emitting diode are arranged on one side of the back plate and used for generating light. And the optical axis of the first light emitting diode is not parallel to the optical axis of the second light emitting diode. The light guide plate is accommodated in the back plate and used for guiding the light generated by the first light emitting diode and the second light emitting diode.

Description

Multi-light source backlight module

technical field

The invention relates to a backlight module, in particular to a backlight module using light emitting diodes.

Background technique

Backlight module (Back light module) is one of the key components of liquid crystal display panel (Liquid crystal display panel, LCD panel). The effective light mechanism converts it into a surface light source with high brightness and uniform luminance to provide the backlight source for the LCD panel. LCD panels have been widely used in electronic products with growth potential such as monitors, notebook computers, digital cameras, and projectors. Especially, large-sized panels such as notebook computers and LCD monitors have the greatest demand. Therefore, backlight modules Demand growth is also growing stronger.

Currently, the light source used in the backlight module is not only the cold cathode fluorescent tube, but also the light emitting diode is gradually applied to medium and large size liquid crystal displays. Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a display area of a light emitting diode 12 of a backlight module 10 in the prior art. Traditionally, a plurality of light emitting diodes (light emitting diodes) 12 are installed on one side of the frame 16, however, the range of light emitted by the light emitting diodes 12 can generally reach 110 degrees (as shown by the included angle A), so it is limited by the emitted light. Due to the limitation of the irradiation range of the light, a dark band 100 will be generated in the visible range of the active area 18, which will affect the display quality of the image. Therefore, please refer to FIG. 2 , which is a schematic diagram of the display range of the light emitting diodes 12 of another conventional backlight module 14 . Although more light-emitting diodes 12 can be added on one side of the outer frame 16 to improve the problem of the dark band 100 shown in FIG. Said that such a design is not economical.

Therefore, please refer to FIG. 3 . FIG. 3 is a schematic diagram of the display range of the light emitting diodes 22 of another conventional backlight module 20 . Different from the configuration of the backlight module 10 , the light emitting diodes 22 of the backlight module 20 are arranged at the corners of the outer frame 26 , so that only two or even one light emitting diode 22 can cover the visible range required by the light emitting pixel area 28 . However, the backlight module configured in this way may have the disadvantage of insufficient brightness.

Contents of the invention

Therefore, the object of the present invention is to provide a backlight module in which multiple light emitting diodes are arranged on one side of the back plate, and the multiple light emitting diodes are arranged in different optical axis directions to achieve It can generate light with both brightness and enough to cover the viewing area required by the entire display, so as to solve the above-mentioned problems in the prior art.

The invention provides a backlight module with multiple light sources, which includes a backboard, a first light emitting diode, a second light emitting diode and a light guide plate. Both the first light emitting diode and the second light emitting diode are disposed on one side of the back plate for generating light. And the optical axis of the first light emitting diode is not parallel to the optical axis of the second light emitting diode projected on the plane of the back plate. The light guide plate is accommodated on the back plate and is used to guide the light generated by the first light emitting diode and the second light emitting diode; wherein the side of the light guide plate is designed to have a direction according to the number of light emitting diodes to be used. The shape of the lug protruding outward or the groove concave inward has a first light incident surface and a second light incident surface that are not parallel to each other at the lug or the groove, the first light emitting diode and the light incident surface The second light-emitting diodes are respectively arranged on the first light-incident surface and the second light-incident surface of the light guide plate.

The present invention further provides a multi-light source backlight module, which includes a back plate, at least one first LED light source group and a second LED light source group, and a light guide plate. The first light emitting diode light source group includes a first light emitting diode and a second light emitting diode, which are arranged on one side of the back plate, and the optical axis of the first light emitting diode and the optical axis of the second light emitting diode are projected on the back. Non-parallel in the plane of the plate. The second light emitting diode light source group includes a third light emitting diode and a fourth light emitting diode, and is arranged on the same side of the back plate as the first light emitting diode light source group, wherein the optical axis of the third light emitting diode is the same as that of the first light emitting diode The optical axes of the four light-emitting diodes are not parallel when projected on the backplane plane. The light guide plate is accommodated on the back plate and is used to guide the light generated by the first light emitting diode and the second light emitting diode; wherein the side of the light guide plate is designed to match the number of light emitting diodes to be used. At least two outwardly protruding lugs or at least two inwardly concave grooves have a first light-incident surface and a second light-incident surface that are not parallel to each other at the lugs or the grooves , the first light emitting diode and the second light emitting diode are respectively arranged on the first light incident surface and the second light incident surface of the light guide plate.

The present invention further provides a multi-light source backlight module, which includes a back plate, a plurality of LED light source groups and a light guide plate. Each light emitting diode light source group includes a first light emitting diode and a second light emitting diode. The plurality of light emitting diode light source groups are arranged on one side of the back plate, and the optical axis of the first light emitting diode is aligned with the second light emitting diode. The optical axis of the projection is not parallel to the plane of the backplane. The light guide plate is accommodated on the back plate to guide the generated light; wherein the side of the light guide plate is designed to have outwardly protruding lugs or lugs in accordance with the number of LED light source groups to be used. Inwardly concave groove shape, and each group of light emitting diode light source groups corresponding to the lug or the groove has at least a first light incident surface and a second light incident surface that are not parallel to each other, the first light incident surface The light emitting diode and the second light emitting diode are respectively arranged on the first light incident surface and the second light incident surface of the light guide plate.

Description of drawings

FIG. 1 is a schematic diagram of a display range of a light emitting diode of a backlight module in the prior art;

FIG. 2 is a schematic diagram of a display range of light emitting diodes in another prior art backlight module;

FIG. 3 is a schematic diagram of a display range of light emitting diodes in another prior art backlight module;

4 is a schematic structural view of a backlight module according to a first embodiment of the present invention;

5 is a schematic structural view of a backlight module according to a second embodiment of the present invention;

6 is a schematic structural diagram of a backlight module according to a third embodiment of the present invention;

7 is a schematic structural diagram of a backlight module according to a fourth embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a backlight module according to a fifth embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a backlight module according to a sixth embodiment of the present invention.

Description of main component symbols

12 light-emitting diodes 10, 14 backlight module

16 backplane 18 luminous pixel area

20, 40 backlight module 22 light emitting diodes

26 backplanes 28 light-emitting pixel areas

30, 40 backlight module 36, 46 backplane

38, 48 light-emitting pixel areas 52, 82 light-emitting diode light source groups

50, 60 backlight module 56, 66 backplane

58, 68 light-emitting pixel area 70, 80 backlight module

86 backplane 88 light-emitting pixel area

321 light-emitting diodes 322 light-emitting diodes

331 optical axis 332 optical axis

421-424 light-emitting diode 431-434 optical axis

631-633 optical axis 521, 522 light-emitting diodes

621-623 light-emitting diodes 821-823 light-emitting diodes

34, 44 light guide plate 54, 64 light guide plate

74, 84 light guide plate 341, 342 light incident surface

541-542 light incident surface 641-643 light incident surface

441-444 incident surface

Detailed ways

In the present invention, the backlight module includes a backplane and a plurality of light emitting diodes. And put light guide plate (Light guide plate), diffusion sheet (Diffusion sheet), prism sheet (Brightness Enhancement Film) and other optical components on the backlight. The light guide plate is used to guide the light emitted by the light emitting diodes, for example. When the light emitted by the light-emitting diode enters the light guide plate, the light guide plate will guide the incoming light source and distribute it into a uniform surface light source, and the light emitted by the light guide plate will go through the uniform light effect of the diffusion sheet and the light collection of the prism sheet. The function can improve the brightness and uniformity of the light source. To simplify the drawings, these components are not shown in detail in the embodiments described below.

Please refer to FIG. 4 , which is a schematic structural diagram of the backlight module 30 according to the first embodiment of the present invention. The backlight module 30 includes a backplane 36 . The backlight module 30 includes a first LED 321 and a second LED 322 . Both the LEDs 321 and 322 are disposed on the same side of the backplane 36 . The optical axis 331 of the first LED 321 and the optical axis 332 of a second LED 322 are not parallel. Please note that the optical axis refers to the centerline of the maximum irradiating range that the light generated by the LED can irradiate. Currently, the included angle of the maximum irradiating range of the LED is about 110 degrees. In FIG. 4 , the illumination range of the LEDs 321 and 322 is sufficient to cover the visible range of the active area 38 . If in order to achieve better light transmission efficiency, as shown in Figure 4, the side of the light guide plate 34 can match the number of light-emitting diodes to be used, and can be designed to have an outwardly protruding lug shape, and has a The light incident surfaces 341 and 342 of the same plane. In this way, the light emitting diodes 321, 322 are respectively arranged on the light incident surfaces 341, 342 of the light guide plate 34; the optical axes 331, 332 of the light emitting diodes 321, 322 are respectively perpendicular to the light incident surfaces 341, 342 of the light guide plate 34, and can reach The purpose is that the optical axes 331 , 332 of the LEDs 321 , 322 are not parallel to each other.

Please refer to FIG. 5 , which is a schematic structural diagram of a backlight module 50 according to a second embodiment of the present invention. When the area of the light-emitting pixel area 58 is large, the illumination range provided by the original backlight module with only two light-emitting diodes will not be sufficient to provide the required light-emitting pixel area 58 . Therefore, in the second embodiment, the backlight module 50 includes two LED light source groups 52 , and each LED light source group 52 includes a first LED 521 and a second LED 522 . Both the LEDs 521 and 522 are disposed on the same side of the backplane 56 . The optical axis 531 of the first LED 521 and the optical axis 532 of a second LED 522 are not parallel. In Fig. 5, only two groups of light-emitting diode light source groups 52 are shown. If the light-emitting pixel area 58 is larger, then three or more groups of light-emitting diode light source groups 52 can be set as required to provide enough to cover the light-emitting pixel area. Aspect range of light. If in order to achieve better light transmission efficiency, as shown in Figure 5, the side of the light guide plate 54 can match the number of light-emitting diodes to be used, and can be designed to have an outwardly protruding lug shape, and has a The light incident surfaces 541 and 542 of the same plane. In this way, the light emitting diodes 521, 522 are arranged on the light incident surfaces 541, 542 of the light guide plate 54 respectively; The purpose is that the optical axes 531 , 532 of the LEDs 521 , 522 are not parallel to each other.

Please refer to FIG. 6 , which is a schematic structural diagram of a backlight module 40 according to a third embodiment of the present invention. Different from the backlight module 50 in FIG. 5 , the backlight module 40 in FIG. 6 includes a first light emitting diode 421 , a second light emitting diode 422 , a third light emitting diode 423 and a fourth light emitting diode 424 , and any two light emitting diodes The optical axes 431 , 432 , 433 , 434 of 421 , 422 , 423 , 424 are not parallel to each other, and the LEDs 421 , 422 , 423 , 424 are all disposed on the same side of the back plate 46 . In Fig. 6, only four light-emitting diodes 421, 422, 423, 424 are shown. If the light-emitting pixel area 48 is larger, five or more light-emitting diodes may be arranged as required, and the optical axes of a plurality of light-emitting diodes Two of them are not parallel, so that light enough to cover the visible range of the light-emitting pixel area 48 can also be provided. If in order to achieve better light transmission efficiency, as shown in Figure 6, the side of the light guide plate 44 can be designed to have an outwardly protruding lug shape in accordance with the number of light emitting diodes to be used, and has a The light incident surfaces 441 , 442 , 443 , 444 are on the same plane. In this way, the light emitting diodes 421, 422, 423, 424 are arranged on the light incident surfaces 441, 442, 443, 444 of the light guide plate 44; the optical axes 431, 432, 433, 434 of the light emitting diodes 421, 422, 423, 424 The light incident surfaces 441 , 442 , 443 , 444 of the light guide plate 44 are perpendicular to each other, and the optical axes 431 , 432 , 433 , 434 of the LEDs 421 , 422 , 423 , 424 are not parallel to each other.

Please refer to FIG. 7 , which is a schematic structural diagram of a backlight module 60 according to a fourth embodiment of the present invention. The backlight module 60 includes a first LED 621 , a second LED 622 and a third LED 623 . The LEDs 621 , 622 , 623 are all disposed on the same side of the back plate 66 and arranged closely adjacent to each other. The optical axis 631 of the first LED 621 , the optical axis 632 of the second LED 622 and the optical axis 633 of the third LED 623 are not parallel to each other. If in order to achieve better light transmission efficiency, as shown in Figure 7, the side of the light guide plate 64 can match the number of light emitting diodes to be used, and can be designed to have an outwardly protruding lug shape, and has a The light incident surfaces 641, 642, 643 of the same plane. In this way, the light emitting diodes 621, 622, 623 are respectively arranged on the light incident surfaces 641, 642, 643 of the light guide plate 64; Surfaces 641, 642, 643, and can achieve the purpose that the optical axes 631, 632, 633 of the LEDs 621, 622, 623 are not parallel to each other.

Please refer to FIG. 8 , which is a schematic structural diagram of a backlight module 70 according to a fifth embodiment of the present invention. The difference between Fig. 7 and the embodiment of Fig. 8 is only the difference in the placement angles of light emitting diodes 621, 622, 623, but the optical axis of the first light emitting diode 621, the optical axis of a second light emitting diode 622 and the third light emitting diode 623 The optical axes are still pairwise non-parallel. If in order to achieve better light transmission efficiency, as shown in Figure 8, the side of the light guide plate 74 can be designed to have an inward concave groove shape in accordance with the number of light emitting diodes to be used, and have different Flat incident surface. In this way, the light emitting diodes 621, 622, 623 are respectively arranged on the light incident surface in the groove of the light guide plate 74; light surface, and can achieve the purpose that the optical axes 631, 632, 633 of the light emitting diodes 621, 622, 623 are not parallel to each other.

Please refer to FIG. 9 , which is a schematic structural diagram of a backlight module 80 according to a sixth embodiment of the present invention. When the area of the light-emitting pixel area 88 is relatively large, the illumination range provided by the original backlight module with only three light-emitting diodes will not be sufficient to meet the needs of the light-emitting pixel area 88 . Therefore, in the sixth embodiment, the backlight module 80 includes two LED light source groups 82 , and each LED light source group 82 includes a first LED 821 , a second LED 822 and a third LED 823 . The LEDs 821 , 822 , 823 are all disposed on the same side of the backplane 86 . The optical axis of the first LED 821 , the optical axis of the second LED 822 and the optical axis of the third LED are not parallel to each other. In FIG. 9 , only two groups of LED light source groups 82 are shown. If the light-emitting pixel area 88 is larger, three or more groups of LED light source groups 82 can be set as required to provide enough to cover the light-emitting pixel area 88. Visible range of light. If in order to achieve better light transmission efficiency, as shown in Figure 9, the side of the light guide plate 84 can be designed to have an inwardly concave groove shape in accordance with the number of light-emitting diodes to be used, and have different positions. Flat incident surface. In this way, the light-emitting diodes 821, 822 are respectively arranged on the light incident surface in the groove of the light guide plate 84; the optical axes of the light-emitting diodes 821, 822 are respectively perpendicular to the light incident surface in the groove of the light guide plate 84, and can reach the , 822 for the purpose that the optical axes are not parallel to each other.

Compared with the prior art, the present invention provides a backlight module in which a plurality of light emitting diodes are arranged on one side of the back panel, and a plurality of light emitting diodes are arranged in different directions of optical axes to achieve the utilization of less light emission. Diodes can produce light that is both bright and sufficient to cover the viewing area required by the entire display. Such a design would facilitate the economics of manufacture.

Although the present invention has been disclosed in conjunction with the above preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The protection scope of the invention shall be defined by the claims.

Claims (17)

1. backlight module, it comprises:

One backboard;

One first light emitting diode is arranged at a side of this backboard, is used for producing light;

One second light emitting diode is arranged at the same side of this backboard with this first light emitting diode, is used for producing light, and wherein this first optical axis of LED and this second optical axis of LED projection are on the backboard plane and not parallel; And

One light guide plate is placed on this backboard, is used for guiding the light of this first light emitting diode and the generation of this second light emitting diode;

Wherein the side of this light guide plate cooperates the light emitting diode quantity of institute's desire use and is designed to have the lug of outside protrusion or the groove shapes that concaves, and having uneven each other one first incidence surface and one second incidence surface at this lug or this groove, this first light emitting diode and this second luminous utmost point pipe are arranged at respectively on first incidence surface and second incidence surface of this light guide plate.

2. backlight module as claimed in claim 1, it comprises one the 3rd light emitting diode in addition, is arranged between this first light emitting diode and this second light emitting diode.

3. backlight module as claimed in claim 2, not parallel this first optical axis of LED of the 3rd optical axis of LED wherein, and be not parallel to this second optical axis of LED.

4. backlight module as claimed in claim 2, wherein the 3rd light emitting diode and this first light emitting diode and this second light emitting diode are adjacent.

5. backlight module as claimed in claim 1, wherein this first light emitting diode and this second optical axis of LED are respectively perpendicular to this first incidence surface and this second incidence surface.

6. backlight module as claimed in claim 2, wherein this light guide plate more comprises and this first incidence surface and uneven one the 3rd incidence surface of this second incidence surface, the 3rd optical axis of LED is perpendicular to the 3rd incidence surface.

7. backlight module, it comprises:

One backboard;

At least one first LED source group and one second LED source group, wherein this first LED source group comprises one first light emitting diode and one second light emitting diode, be arranged at a side of this backboard, this first optical axis of LED and this second optical axis of LED are not parallel; This second LED source group comprises one the 3rd light emitting diode and one the 4th light emitting diode, be arranged at the same side of this backboard with this first LED source group, wherein the 3rd optical axis of LED and the 4th optical axis of LED are not parallel; And

One light guide plate is placed on this backboard, is used for guiding the light of generation;

Wherein the side of this light guide plate cooperates the quantity of the LED source group that institute's desire uses and is designed to have at least two lug or at least two groove shapes that concave of outwards protruding, and have uneven each other first incidence surface and second incidence surface at this lug or this groove, and have uneven each other the 3rd incidence surface and the 4th incidence surface at another this lug or another this groove, this first light emitting diode and this second luminous utmost point pipe are arranged at respectively on first incidence surface and second incidence surface of this light guide plate, and the 3rd light emitting diode and the 4th luminous utmost point pipe are arranged at respectively on the 3rd incidence surface and the 4th incidence surface of this light guide plate.

8. backlight module as claimed in claim 7, wherein this first LED source group comprises one the 5th light emitting diode in addition, be arranged between this first light emitting diode and this second light emitting diode, not parallel this first optical axis of LED of the 5th optical axis of LED, and be not parallel to this second optical axis of LED.

9. backlight module as claimed in claim 7, wherein this first light emitting diode and this second optical axis of LED are respectively perpendicular to this first incidence surface and this second incidence surface.

10. backlight module as claimed in claim 8, wherein this light guide plate more comprises and this first incidence surface and uneven one the 3rd incidence surface of this second incidence surface, the 5th optical axis of LED is perpendicular to the 3rd incidence surface.

11. backlight module as claimed in claim 7, wherein this second LED source group comprises one the 6th light emitting diode in addition, be arranged between the 3rd light emitting diode and the 4th light emitting diode, not parallel the 3rd optical axis of LED of the 6th optical axis of LED, and be not parallel to the 4th optical axis of LED.

12. backlight module as claimed in claim 11, wherein this light guide plate more comprises and the 4th incidence surface and uneven one the 6th incidence surface of the 5th incidence surface, and the 6th optical axis of LED is perpendicular to the 6th incidence surface.

13. backlight module as claimed in claim 7, wherein this backlight module is used for a LCD.

14. a backlight module, it comprises:

One backboard;

A plurality of LED source groups, each LED source group comprises one first light emitting diode and one second light emitting diode, these a plurality of LED source groups are arranged at a side of this backboard, and this first optical axis of LED and this second optical axis of LED are not parallel; And

One light guide plate is placed on this backboard, is used for guiding the light of generation;

Wherein the side of this light guide plate cooperates the quantity of the LED source group that institute's desire uses and is designed to have the lug of outside protrusion or the groove shapes that concaves, and having uneven each other one first incidence surface and one second incidence surface at least in each group LED source group of this lug or this groove correspondence, this first light emitting diode and this second luminous utmost point pipe are arranged at respectively on first incidence surface and second incidence surface of this light guide plate.

15. backlight module as claimed in claim 14, wherein this each LED source group comprises one the 3rd light emitting diode in addition, not parallel this first optical axis of LED of the 3rd optical axis of LED, and be not parallel to this second optical axis of LED.

16. backlight module as claimed in claim 14, wherein this first light emitting diode and this second optical axis of LED are respectively perpendicular to this first incidence surface and this second incidence surface of this light guide plate.

17. backlight module as claimed in claim 15, wherein this light guide plate more comprises and this first incidence surface, uneven one the 3rd incidence surface of this second incidence surface, and the 3rd optical axis of LED is perpendicular to the 3rd incidence surface of this light guide plate.

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