CN103017023A - Backlight module and display device using same - Google Patents

Abstract

The present invention provides a backlight module and a display device using the backlight module, wherein the backlight module includes a light guide plate and a light source device, and the light source device includes an LED chip whose light emitting surface directly faces the side of the light guide plate. The display device using the backlight module of the present invention includes the backlight module of the present invention. The size of the light source device in the backlight module of the present invention will be greatly reduced due to the omission of the lamp cavity, so that the thickness of the backlight module will also be reduced accordingly. Canceling the lamp cavity can also increase the light angle of the light source device, and the light from all sides of the LED chip will enter the light guide plate from the side, so that the light incident angle of the light entering the light guide plate is greatly improved, thereby avoiding the appearance of light spots, and at the same time The brightness of the backlight module is improved. The display device using the backlight module of the present invention, because of the backlight module of the present invention, its overall thickness can be reduced, the cost can be further reduced, and its display quality can be greatly improved.

Description

Backlight module and display device using the backlight module

technical field

The invention relates to the field of display technology, in particular to a backlight module and a display device using the backlight module.

Background technique

The backlight module is one of the important components of the liquid crystal display. Since the liquid crystal itself does not emit light, the function of the backlight module is to supply sufficient brightness and evenly distributed light source, so that the liquid crystal display can display images normally. At present, the display technology of liquid crystal display has become mature, especially in the design of the backlight module. In addition to being used in liquid crystal display devices such as liquid crystal displays and liquid crystal televisions, backlight modules can also provide light sources for display devices such as digital photo frames, electronic paper, and mobile phones.

The backlight module is divided into an edge-type backlight module and a direct-type backlight module according to the position of the light source.

Fig. 1 shows the structure of an edge-lit backlight module in the prior art. This backlight module includes a light guide plate 1' and a light source device 2' arranged outside the side of the light guide plate 1'. The light source device 2 'includes the LED chips 3' arranged in the lamp cavity 10'. The LED chip 3' and the lamp chamber 10 for encapsulating the LED chip 3' form an LED lamp. The light emitting surface of the LED chip 3' is not directly facing the side of the light guide plate 1', and the light emitting surface of the LED chip 3' and the light guide plate 1' also have a lamp chamber 10 made of glass or plastic. The thickness of the backlight module with this structure is largely determined by the thickness of the LED lamp. Due to the existence of the lamp cavity 10, the thickness of the backlight module with this structure is relatively large; at the same time, the existence of the lamp cavity 10 limits the LED lamp The light emitting angle of the lamp and the light incident angle of the light guide plate 1 ′ are small, and light spots are likely to appear on the light guide plate 1 ′.

Contents of the invention

The object of the present invention is to provide a backlight module which can reduce the thickness of the backlight module and avoid light spots on the light guide plate 1' and a display device using the backlight module.

The backlight module of the present invention includes a light guide plate and a light source device disposed outside the side of the light guide plate, and the light source device includes an LED chip whose light emitting surface directly faces the side of the light guide plate.

In the backlight module of the present invention, the light source device further includes a lampshade covering the LED chip from the outside of the LED chip, and the lampshade reflects the light emitted by the LED chip to the side of the light guide plate.

In the backlight module of the present invention, the lampshade includes a first plane perpendicular to the light guide plate and located outside the LED chip, a second plane, a third plane respectively connected to two ends of the first plane. A plane body, the second plane body and the third plane body are parallel to the light guide plate, the second plane body and the third plane body respectively extend from both ends of the first plane body to the light guide plate, To form a cavity surrounding the LED chip and reflecting the light emitted by the LED chip to the side of the light guide plate.

The backlight module of the present invention, wherein, on the surface of the first surface of the lampshade facing the LED chip, on the surface of the second surface of the lampshade facing the LED chip, on the third surface of the lampshade Phosphor powder layers are arranged on the surface of the face body facing the LED chip.

In the backlight module of the present invention, a yellow phosphor layer is provided on the side of the light guide plate facing the LED chip.

The backlight module of the present invention, wherein, on the surface of the first surface of the lampshade facing the LED chip, on the surface of the second surface of the lampshade facing the LED chip, on the third surface of the lampshade Phosphor powder layers are arranged on the surface of the surface facing the LED chip.

In the backlight module of the present invention, the light source device further includes a flexible circuit board located inside the lampshade, the flexible circuit board is located between the lampshade and the LED chip, and the LED chip and the The flexible circuit board is electrically connected.

In the backlight module of the present invention, wherein the flexible circuit board is perpendicular to the light guide plate, there are multiple LED chips, and the multiple LED chips are arranged on the lampshade along the extension direction of the side surface of the light guide plate within the flexible circuit board.

In the backlight module of the present invention, wherein the LED chip includes an N junction and a P junction electrically connected to the N junction, the P junction directly faces the side of the light guide plate, and the N junction is located at the P junction. Between the flexible circuit board and the flexible circuit board, the N junction is electrically connected to the flexible circuit board.

The display device using the backlight module of the present invention includes the backlight module of the present invention.

The size of the light source device in the backlight module of the present invention will be greatly reduced due to the omission of the lamp cavity, so that the thickness of the backlight module will also be reduced accordingly. Canceling the lamp cavity can also increase the light-emitting angle of the light source device. Without the limitation of the lamp cavity, the light from all sides of the LED chip will enter the light guide plate from the side, so that the light incident angle of the light entering the light guide plate is greatly improved, thereby avoiding the light incident Spots appear, and the brightness of the backlight module is improved at the same time.

In the display device using the backlight module of the present invention, because the backlight module of the present invention is used, the overall thickness can be reduced, the cost can be further reduced, and the display quality can be greatly improved.

Description of drawings

FIG. 1 is a schematic structural view of a backlight module in the prior art;

Fig. 2 is the front view of the structural representation of the backlight module of the present invention;

FIG. 3 is a top sectional view of FIG. 2 , showing the structure of the backlight module of the present invention after removing the lampshade.

Detailed ways

As shown in Fig. 2 and Fig. 3, the embodiment of the backlight module of the present invention includes a light guide plate and a light source device 2 arranged on the outside of the side of the light guide plate 1, and the light source device 2 includes a light emitting surface directly facing the side of the light guide plate 1. The LED chip 3 and the light source device 2 are not provided with a lamp chamber for encapsulating the LED chip 3 .

The light source device in the backlight module of the present invention cancels the lamp cavity in the prior art, so that the size of the light source device is reduced, so the thickness of the backlight module is also reduced accordingly. Canceling the lamp cavity can also increase the light-emitting angle of the light source device. Without the limitation of the lamp cavity, the light from all sides of the LED chip will enter the light guide plate from the side, so that the light incident angle of the light entering the light guide plate is greatly improved, thereby avoiding the light incident Spots appear, and the brightness of the backlight module is improved at the same time.

In the embodiment of the backlight module of the present invention, there are two light source devices 2 , which are respectively located outside the two opposite sides of the light guide plate 1 .

In other embodiments of the backlight module of the present invention, the light source device can also be located only on one side of the light guide plate, or be set in other different positions as required, such as a corner setting. The purpose of the light source devices being located on two opposite sides of the light guide plate is to obtain a more uniform surface light source after the light passes through the light guide plate.

In order to improve the utilization rate of the light emission of the LED chip 3 and avoid light loss, in the backlight module of the present invention, the light source device 2 further includes a lampshade 4 covering the LED chip 3 from the outside of the LED chip 3, and the lampshade 4 emits light from the LED chip 3. The light is reflected to the side of the light guide plate 1.

In an embodiment of the backlight module of the present invention, the lampshade 4 includes a first surface body 11 perpendicular to the light guide plate 1 and located outside the LED chip 3 , and a second surface body 12 respectively connected to two ends of the first surface body 11 , a second surface body 11 Trihedral body 13, the second body 12 and the third body 13 are all parallel to the light guide plate 1, the second body 12 and the third body 13 respectively extend from the two ends of the first body 11 to the light guide plate 1 to form a surrounding LED chip 3 and reflect the light emitted by the LED chip 3 to the cavity on the side of the light guide plate 1.

In the embodiment of the backlight module of the present invention, the second plane body 12 and the third plane body 13 are respectively perpendicular to the first plane body 11 .

In order to make the lampshade 4 reflect the light emitted by the LED chip 3 to the side of the light guide plate 1 more efficiently, in the embodiment of the backlight module of the present invention, wherein, the surface of the first surface body 11 of the lampshade 4 facing the LED chip 3 The yellow phosphor layer 7 is provided on the surface of the second surface 12 of the lampshade 4 facing the LED chip 3 and on the surface of the third surface 13 of the lampshade 4 facing the LED chip 3 .

In an embodiment of the backlight module of the present invention, a yellow phosphor layer 7 is provided on the side of the light guide plate 1 facing the LED chips 3 .

The yellow fluorescent powder is used to absorb part of the excitation light emitted by the LED chip, and thereby excites emission light with a wavelength different from that of the excitation light emitted by the LED chip. For example, the excitation light emitted by the LED chip is blue light, and the LED The blue light emitted by the chip complements the yellow light emitted by the yellow phosphor to form white light. Of course, the above-mentioned examples are just for illustration, and they are all described with a backlight emitting white light. It can also mix light of other colors through the arrangement of the phosphor layer. As long as the yellow phosphor layer is arranged on the light guide plate, the Within the scope of protection of the invention, the arrangement on the light guide plate is not limited to the light incident surface, and can be any other position. The embodiment of the present invention is preferably set on the light incident surface of the light guide plate, that is, the light guide in the embodiment of the present invention. On the side of the light board 1 facing the LED chip 3 .

The method of setting the above-mentioned yellow phosphor layer can be formed by uniform coating of the yellow phosphor colloid, the thickness of the yellow phosphor layer 7 is between 0.05 mm and 1 mm, and the above-mentioned setting method can also be that the yellow phosphor colloid is first processed into The film layer is directly attached to the position to be set, or the phosphor powder is directly doped to the position to be set, or the phosphor powder is integrally formed with the structure to be attached, or the phosphor powder is mixed into a chemical solvent and sprayed The method is formed at the desired location, and the specific manufacturing method is not limited here, as long as the structure protected by the present invention can be realized.

In other embodiments of the backlight module of the present invention, on the surface of the first surface body 11 of the lampshade 4 facing the LED chip 3, on the surface of the second surface body 12 of the lampshade 4 facing the LED chip 3, on the second surface of the lampshade 4 Phosphor powder layers are provided on the surfaces of the trihedron 13 facing the LED chip 3 . Phosphor powder is used to absorb part of the excitation light emitted by the LED chip, and to excite emission light with a wavelength different from that of the excitation light emitted by the LED chip. For example, the excitation light emitted by the LED chip is blue light, and the phosphor powder is yellow. Phosphor, the blue light emitted by the LED chip is complementary to the yellow light emitted by the yellow phosphor to form white light, or the excitation light emitted by the LED chip is green light, the phosphor includes red phosphor and blue phosphor, the LED The green light emitted by the chip and the red light emitted by the red phosphor are complementary to the blue light emitted by the blue phosphor to form white light, or the excitation light emitted by the LED chip is ultraviolet light, and the phosphor is blue phosphor, The ultraviolet light emitted by the LED chip and the blue light emitted by the blue phosphor complement each other to form white light. Of course, the above examples are for illustration only, and they are all described with a backlight emitting white light. It can also be mixed with other phosphors by setting the phosphor layer. As long as the fluorescent powder layer is arranged on the lampshade for the light of different colors, it is within the protection scope of the present invention.

The above-mentioned setting method can also be processed into a film layer of the phosphor colloid and then directly attached to the position to be set, or directly doped with the phosphor powder at the position to be set, or integrally formed with the phosphor powder and the structure to be attached setting, or mixing the fluorescent powder into a chemical solvent and spraying it on the desired setting position. There is no limitation to the specific manufacturing method here, as long as the structure protected by the present invention can be realized.

In the embodiment of the backlight module of the present invention, the light source device 2 further includes a flexible circuit board 5 inside the lampshade 4 . The flexible circuit board 5 is located between the lampshade 4 and the LED chip 3 , and the LED chip 3 is electrically connected to the flexible circuit board 5 .

In the embodiment of the backlight module of the present invention, the flexible circuit board 5 is perpendicular to the light guide plate 1, there are multiple LED chips 3, and the plurality of LED chips 3 are arranged in the flexible circuit board 4 inside the lampshade 4 along the extending direction of the side of the light guide plate 1. on circuit board 5.

In an embodiment of the backlight module of the present invention, wherein the LED chip 3 includes an N junction 31 and a P junction 32 electrically connected to the N junction, the P junction 32 directly faces the side of the light guide plate 1, and the N junction 31 is located between the P junction 32 and the flexible Between the circuit boards 55 , the N junction 31 is electrically connected to the flexible circuit board 5 .

The backlight module in the display device using the backlight module in the embodiment of the present invention is the backlight module in the above embodiment. The display device may be any product or component with a display function such as a liquid crystal panel, an electronic paper, an OLED panel, a liquid crystal TV, a liquid crystal display, a digital photo frame, a mobile phone, and a tablet computer.

Because the light source device in the backlight module of the present invention cancels the lamp chamber, the size will be greatly reduced, and the thickness of the backlight module will also be reduced accordingly: for example, the thickness of the lamp chamber of the 3806 model that accommodates the LED chip is 0.6mm, like this Only the light guide plate with a thickness of 0.6mm or more can be selected. If the thickness of the light guide plate is less than or equal to 0.6mm, there will be a large loss of brightness; if the lamp cavity is canceled, the thickness of the light source device will be reduced from 0.6mm to 0.3mm. A light guide plate with a thickness of 0.3 mm can be selected, so that the thickness of the backlight module is reduced accordingly.

Canceling the lamp cavity can also increase the light emitting angle of the light source device. Due to the limitation of the lamp cavity, the light emitting angle of the existing light source device is generally about 120 degrees. After the lamp cavity is removed, the light emitting angle of the light source device increases to about 180 degrees. Entering into the light guide plate, the incident angle of the light entering the light guide plate is greatly improved, thereby avoiding the occurrence of incident light spots, and at the same time, the brightness of the backlight module is improved.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. backlight module, the light supply apparatus in the outside that comprises LGP and be arranged at the side of described LGP is characterized in that, described light supply apparatus comprises that exiting surface is directly towards the led chip of the side of described LGP.

2. backlight module according to claim 1 is characterized in that, described light supply apparatus also comprises the lampshade that shrouds described led chip from the outside of described led chip, and the light reflection that described lampshade sends described led chip is to the side of described LGP.

3. backlight module according to claim 2, it is characterized in that, described lampshade comprises vertical with described LGP and is positioned at the first surface body in the outside of described led chip and dihedron, the trihedral that is connected respectively the two ends of described first surface body, described dihedron, described trihedral are all parallel with described LGP, described dihedron, described trihedral extend to described LGP from the two ends of described first surface body respectively, to consist of a light reflection that surrounds described led chip and described led chip is sent to the cavity of the side of described LGP.

4. backlight module according to claim 3, it is characterized in that, the first surface body of described lampshade on the surface of described led chip, the dihedron of described lampshade on the surface of described led chip, the trihedral of described lampshade on the surface of described led chip, all scribble the yellow fluorescence bisque.

5. backlight module according to claim 4 is characterized in that, described LGP on the side of described led chip, scribble the yellow fluorescence bisque.

6. backlight module according to claim 3, it is characterized in that, the first surface body of described lampshade on the surface of described led chip, the dihedron of described lampshade on the surface of described led chip, the trihedral of described lampshade on the surface of described led chip, all be covered with the fluorescent powder membrane material.

7. backlight module according to claim 2, it is characterized in that, described light supply apparatus also comprises the FPC of the inside that is positioned at described lampshade, and described FPC is between described lampshade and described led chip, and described led chip is electrically connected with described FPC.

8. backlight module according to claim 7, it is characterized in that, described FPC is vertical with described LGP, and described led chip is a plurality of, on described a plurality of led chips are arranged in described FPC in the described lampshade along the bearing of trend of the side of described LGP.

9. backlight module according to claim 1, it is characterized in that, described led chip comprises N knot and the P knot that is electrically connected with described N knot, the direct side towards described LGP of described P knot, described N knot is between described P knot and described FPC, and described N knot is electrically connected with described FPC.

10. a display unit of using backlight module is characterized in that, comprises each described backlight module such as claim 1-9.

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