CN101308284B - Backlight module, liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

A backlight module includes a first light guide plate and at least two first light sources. The first light guide plate has at least two first light guide areas and at least one first non-light guide area; the first light sources are respectively arranged corresponding to the first light guide areas. A method for manufacturing a backlight module includes: forming at least two first light guide areas and at least one first non-light guide area on the first light guide plate; and arranging at least two first light sources respectively corresponding to these first light guide areas. The present invention also discloses a liquid crystal display device and a method for manufacturing the same.

Description

Backlight module, liquid crystal display device and manufacturing method thereof

field of invention

The invention relates to a backlight module, a liquid crystal display device and a manufacturing method thereof, and in particular to a backlight module, a liquid crystal display device and a manufacturing method thereof capable of performing brightness partition control.

technical background

With the development of flat panel display (FPD) technology, liquid crystal display has gradually replaced the traditional cathode ray tube (Cathode Ray Tube, CRT) display due to its superior characteristics such as light and thin body, low power consumption and no radiation. devices and are used in various electronic products. A general liquid crystal display device is mainly composed of a liquid crystal display panel (Liquid Crystal Display Panel) and a backlight module (Backlight Module).

1, a known backlight module 1 includes a light source 11, a light guide plate (Light-Guiding Plate, LGP) 12, a light diffusion sheet (Optical Diffusing Sheet) 13 and a prism sheet (Prism Sheet) 14. Wherein, the light source 11 is adjacent to the light incident surface 121 of the light guide plate 12, the light diffusion sheet 13 is adjacent to the light output surface 122 of the light guide plate 12, and the prism sheet 14 is adjacent to one side of the light diffusion sheet 13. In addition, the light guide plate 12 has a plurality of printed dots 124 on its bottom surface 123, and the printed dots 124 have the effect of scattering light.

2, when the light source 11 emits light, the light enters the light guide plate 12 through the light incident surface 121 and is totally reflected in the light guide plate 12. When the light passes through the printed dots 124 of the light guide plate 12, it will be scattered and The phenomenon of total reflection of the light is destroyed, causing part of the light to be refracted out of the light-emitting surface 122 of the light guide plate 12 . Then, the light passes through the light diffusion sheet 13 and the prism sheet 14 , and passes through the light diffusion sheet 13 and the prism sheet 14 to obtain good light properties, such as light uniformity, high brightness, and the like. In addition, the distribution of printed dots 124 on the light guide plate 12 is usually uneven, because for the light guide plate 12, the closer to the light source 11, the higher the brightness of the light-emitting surface 122, so the farther away from the light source 11 the printed dots are. The denser the distribution of 124 , the more light can pass through the light-emitting surface 122 farther away from the light source 11 , so that the brightness of the entire light-emitting surface 122 is averaged. Finally, the light passes through the liquid crystal display panel and becomes a colorful picture. Among them, the liquid crystal display panel is mainly composed of two glass substrates sandwiching a liquid crystal layer.

When the light passes through the liquid crystal display panel, the brightness of the light can be changed by controlling the rotation of the liquid crystal molecules in the liquid crystal layer, and then through the light mixing effect brought by the filter, colorful light can be produced, which is also common A control method for brightness and light of a liquid crystal display device. However, in this way, the light source 11 remains on, which not only consumes power but also causes the temperature of the backlight module 1 to rise. In addition, since the liquid crystal molecules cannot completely block light from passing through, the light source 11 remains on. , the liquid crystal molecules will still produce light leakage, which will reduce the contrast of the display screen.

Based on the above, in order to solve the problem that it is difficult to achieve high contrast, a brightness control method for liquid crystal display devices has recently appeared, which uses an image processor in the liquid crystal display device to analyze image data, and then divides the image into Multiple areas, such as shown in FIG. 3 , are divided into four areas, and brightness control of different areas is performed on the backlight module according to the area data. Since the overall brightness of the light is determined by the brightness of the light emitted by the light source of the backlight module and the rotation angle of the liquid crystal molecules, when the image processor analyzes a certain area, such as the image data of the first area shown in Figure 3 , you can adjust between the power consumption of the light source and the rotation angle of the liquid crystal molecules to obtain the same brightness. For example, you can lower the power of the light source and increase the rotation angle of the liquid crystal to obtain the same brightness. The overall power consumption is reduced and the temperature of the backlight module is lowered, and the contrast ratio can also be improved. However, this control method has the disadvantage that each zone will affect each other.

Therefore, how to provide a backlight module, a liquid crystal display device and a manufacturing method thereof, which can simultaneously realize brightness partition control to reduce power consumption of the backlight module and improve image contrast, and reduce mutual influence between partitions, thereby improving the brightness of the backlight module. Luminous efficacy is one of the current important issues.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide a backlight module, a liquid crystal display device and a manufacturing method thereof which can simultaneously realize the brightness control of the zones and reduce the mutual influence between the zones, thereby improving the overall performance.

Therefore, in order to achieve the above object, a backlight module according to the present invention includes a first light guide plate and at least two first light sources. The first light guide plate has at least two first light guide areas and at least one first non-light guide area; the first light sources are respectively arranged corresponding to the first light guide areas.

In addition, in order to achieve the above purpose, a liquid crystal display device according to the present invention includes a backlight module and a liquid crystal panel module. The backlight module has a first light guide plate and at least two first light sources. The first light guide plate has at least two first light guide areas and at least one first non-light guide area. The first light sources are respectively arranged corresponding to the first light guide areas. . The liquid crystal panel module is adjacent to the backlight module.

In addition, in order to achieve the above object, a method of manufacturing a backlight module according to the present invention includes forming at least two first light-guiding regions and at least one first non-light-guiding region on the first light-guiding plate; A light source is respectively arranged corresponding to the first light guide area.

In addition, in order to achieve the above object, a manufacturing method of a liquid crystal display device according to the present invention includes forming at least two first light-guiding regions and at least one first non-light-guiding region on the first light-guiding plate; A light source is respectively arranged corresponding to the first light guide area; and the liquid crystal panel module is arranged relative to the first light guide plate.

According to an aspect of the present invention, a backlight module is provided, comprising:

The first light guide plate has at least two first light guide regions and at least one first non-light guide region, wherein these first light guide regions have a plurality of first microstructures;

At least two first light sources are respectively arranged corresponding to the first light guide regions;

The second light guide plate has at least two second light guide areas and at least one second non-light guide area, the second light guide plate is opposite to the first light guide plate, and at least one first non-light guide area is connected to at least one A second light guide area is arranged opposite, wherein, these second light guide areas have a plurality of second microstructures; and

At least two second light sources are respectively arranged corresponding to the second light guide areas.

According to an aspect of the present invention, a liquid crystal display device is provided, comprising:

The backlight module has a first light guide plate and at least two first light sources. The first light guide plate has at least two first light guide areas and at least one first non-light guide area. The light guide regions are arranged correspondingly, wherein these first light guide regions have a plurality of first microstructures; and

The second light guide plate has at least two second light guide areas and at least one second non-light guide area, the second light guide plate is opposite to the first light guide plate, and at least one first non-light guide area is connected to at least one a second light guide area is oppositely disposed; and

At least two second light sources are respectively arranged corresponding to the second light guide regions, wherein the second light guide regions have a plurality of second microstructures; and

The liquid crystal panel module is adjacent to the backlight module.

According to an aspect of the present invention, a method for manufacturing a backlight module is provided, including:

forming at least two first light-guiding regions and at least one first non-light-guiding region on the first light-guiding plate;

setting at least two first light sources respectively corresponding to the first light guide regions;

setting a plurality of first microstructures on the first light guide regions;

disposing the second light guide plate relative to the first light guide plate;

forming at least two second light-guiding regions and at least one second non-light-guiding region on the second light-guiding plate;

setting at least two second light sources respectively corresponding to the second light guide regions;

A plurality of second microstructures are arranged on the second light guide regions;

disposing the multilayer optical film relative to the light exit surface of the second light guide plate or the first light guide plate; and

The first light guide plate or the second light guide plate is accommodated in the back plate, wherein at least one first non-light guide area on the first light guide plate is opposite to at least one second light guide area on the second light guide plate set up.

According to another aspect of the present invention, a method for manufacturing a liquid crystal display device is provided, comprising:

forming at least two first light-guiding regions and at least one first non-light-guiding region on the first light-guiding plate;

setting at least two first light sources respectively corresponding to the first light guide regions;

arranging the liquid crystal panel module relative to the first light guide plate;

setting a plurality of first microstructures on the first light guide regions;

disposing the second light guide plate relative to the first light guide plate;

forming at least two second light-guiding regions and at least one second non-light-guiding region on the second light-guiding plate;

setting at least two second light sources respectively corresponding to the second light guide regions;

A plurality of second microstructures are arranged on the second light guide regions;

disposing the multilayer optical film relative to the light exit surface of the second light guide plate or the first light guide plate; and

The first light guide plate or the second light guide plate is accommodated in the back plate, wherein at least one first non-light guide area on the first light guide plate is opposite to at least one second light guide area on the second light guide plate set up.

Based on the above, according to a backlight module, a liquid crystal display device and a manufacturing method thereof of the present invention, at least two light-guiding regions and at least one non-light-guiding region are arranged on the light-guiding plate, and at least two light sources They are set corresponding to the light guide areas, so each light guide area can be controlled by adjusting the power or driving signal of the corresponding light source. In addition, the non-light guide area can be used as a buffer zone between the two light guide areas, reducing the Interaction of each light guide area. Compared with the known technology, the present invention can simultaneously realize brightness partition control and reduce mutual influence of each partition, thereby reducing power consumption and improving contrast ratio, and can increase luminous efficiency of the backlight module.

Description of drawings

Fig. 1 is a schematic diagram of a backlight module of a known technology;

FIG. 2 is another schematic diagram of the backlight module shown in FIG. 1;

FIG. 3 is a schematic diagram of image partition control in a known technology;

4 is a schematic diagram of a backlight module according to a preferred embodiment of the present invention, wherein the light guide plate is divided into four brightness control areas;

5 is another schematic diagram of a backlight module according to a preferred embodiment of the present invention;

6 is a schematic diagram of another backlight module according to a preferred embodiment of the present invention, wherein the light guide plate is divided into sixteen brightness control areas;

Fig. 7 is a schematic diagram of the optical film of the backlight module shown in Fig. 6;

FIG. 8 is a flowchart of a manufacturing method of a backlight module according to a preferred embodiment of the present invention; and

FIG. 9 is a schematic diagram of a liquid crystal display device according to a preferred embodiment of the present invention.

Detailed ways

A backlight module, a liquid crystal display device and a manufacturing method thereof according to preferred embodiments of the present invention will be described below with reference to related drawings.

Referring to FIG. 4 , a backlight module 2 according to a preferred embodiment of the present invention includes a first light guide plate P ₀₁ and two first light sources L ₀₁ . Wherein, the first light guide plate P ₀₁ has two first light guide areas A ₀₁ and two first non-light guide areas NA ₀₁ , and the first light sources L ₀₁ are respectively arranged corresponding to the first light guide areas A ₀₁ .

In this embodiment, the first light guide plate P ₀₁ can be a rectangular plate, a wedge-shaped plate or a flat plate of other shapes, and the first light source L ₀₁ can include a cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL), a light emitting diode (Light Emitting Diode, LED), organic electroluminescent device (Organic ElectroLuminescent Device, OELD) or field emission device (Field Emission Device, FED), etc., light emitting diode is taken as an example here.

In addition, the first light guide area _A01 of this embodiment has a plurality of first dots or a plurality of first microstructures, these dots or microstructures can scatter the light and destroy the total reflection of the light, causing part of the light to be refracted out of the light emitting surface P ₀₁₁ of the first light guide plate P ₀₁ , while the first non-light guide area NA ₀₁ does not have dots or microstructures, so for the first light guide plate P ₀₁ , there will be relatively more light from the second light guide plate P 01 The light emitting surface P ₀₁₁ corresponding to the light guiding area A ₀₁ is emitted, and relatively less light is emitted from the light emitting surface P ₀₁₁ corresponding to the first non-light guiding area NA ₀₁ .

In this embodiment, the backlight module 2 further includes a second light guide plate P ₀₂ , which has two second light guide areas A ₀₂ and two second non-light guide areas NA ₀₂ , and the second light guide plate P ₀₂ and the first A light guide plate P ₀₁ is set opposite to each other. In addition, two first non-light guide areas NA ₀₁ and two second light guide areas A ₀₂ are set opposite to each other, and two second non-light guide areas NA ₀₂ and two second light guide areas A light guide area A ₀₁ is opposite to each other. In addition, the backlight module 2 further includes two second light sources L ₀₂ , which are respectively arranged corresponding to the second light guide area A ₀₂ .

In this embodiment, the type of the second light source L ₀₂ may be the same as that of the first light source L ₀₁ , so details will not be repeated here. In addition, the second light guide area _A02 has a plurality of second dots or a plurality of second microstructures, and these second dots or second microstructures have the same function as the first dots or the first microstructures, so details will not be repeated here. .

It is worth mentioning that, as shown in FIG. _{5 , which is a cross-sectional view of the first light guide plate P 01 in} FIG. For example, the first network point NP is disposed on the surface of the first light guide plate P ₀₁ , here, the first network point NP is disposed on the surface opposite to the light-emitting surface P ₀₁₁ . In addition, on the first light guide area _A01 , the density of the first dots NP or the first microstructures closer to the first light source _L01 is smaller than that of the first dots NP or the first microstructures farther away from the first light source _L01 . In this way, the light-emitting surface P ₀₁₁ corresponding to the entire first light-guiding area A ₀₁ can have relatively average brightness.

Please refer to FIG. 4 again, further, the difference between the second light guide plate P ₀₂ and the first light guide plate P ₀₁ lies in that the second light guide area A ₀₂ and the first light guide area A ₀₁ are disposed in different positions. In this embodiment, the first light guide plate P ₀₁ and the second light guide plate P ₀₂ are divided into four areas I, II, III, and IV respectively, and the first light guide area A ₀₁ is set on the first light guide plate P ₀₁ In the regions I and III on the upper plate, the second light guide area A ₀₂ is arranged in the regions II and IV on the second light guide plate P ₀₂ .

In this way, on the first light guide plate P ₀₁ , the two first light guide areas A ₀₁ become two brightness control areas, and on the second light guide plate P ₀₂ , the two second light guide areas A ₀₂ also become The two brightness control areas can be divided into four brightness control areas for the backlight module 2. By independently adjusting the two first light sources L _{01 corresponding to the two first light guide areas A 01 and} the two The brightness can be controlled by the driving signals of the two second light sources L ₀₂ corresponding to the second light guide area A ₀₂ .

In addition, in this embodiment, two first light guide areas A ₀₁ and two second light guide areas A ₀₂ are dispersed on the first light guide plate P ₀₁ and the second light guide plate P ₀₂ , and the first non-light guide area NA ₀₁ and the second non-light-guiding area NA ₀₂ can be used as the buffer zone of the first light-guiding area A ₀₁ and the second light-guiding area A ₀₂ respectively, so as to _reduce the The unevenness of brightness caused by the mutual influence between ₀₂ .

In addition, the backlight module 2 of this embodiment takes four brightness control areas as an example. It should be noted that, depending on the number of divided brightness control areas, The numbers also vary. When the backlight module is divided into multiple brightness control areas, it is necessary to have enough light guide plates to disperse the light guide areas, and set the non-light guide area as a buffer zone for each light guide area, and the light guide areas on each light guide plate The sum of the numbers is equal to the number of brightness control areas, and in addition, the number of light sources is also equal to the number of brightness control areas.

The following will take 16 brightness control areas as an example to illustrate the backlight module 3 of another preferred embodiment of the present invention.

Referring to FIG. 6 , the backlight module 3 has a first light guide plate P ₁₁ , a second light guide plate P ₁₂ , a third light guide plate P ₁₃ and a fourth light guide plate P ₁₄ . Wherein, the first light guide plate P ₁₁ has four first light guide areas A ₁₁ , the second light guide plate P ₁₂ has four second light guide areas A ₁₂ , and the third light guide plate P ₁₃ has four third light guide areas A ₁₃ , the fourth light guide plate P ₁₄ has four fourth light guide regions A ₁₄ . In addition, on each light guide plate P ₁₁ -P ₁₄ , the part that is not the light guide area is the non-light guide area, and the non-light guide area is used as the buffer zone of the light guide area. On different light guide plates, the non-light guide area can be They are respectively the first non-light-guiding area NA ₁₁ , the second non-light-guiding area NA ₁₂ , the third non-light-guiding area NA ₁₃ and the fourth non-light-guiding area NA ₁₄ . In addition, the backlight module 3 also has 16 light sources, which are respectively four first light sources L ₁₁ , four second light sources L ₁₂ , four third light sources L ₁₃ and four fourth light sources L ₁₄ , which respectively correspond to four The first light guiding area A ₁₁ , the four second light guiding areas A ₁₂ , the four third light guiding areas A ₁₃ and the four fourth light guiding areas A ₁₄ are arranged correspondingly.

For the backlight module 3 , the first light guide area A ₁₁ , the second light guide area A ₁₂ , the third light guide area A ₁₃ and the fourth light guide area A ₁₄ correspond to 16 brightness control areas in total. By independently adjusting the first light source L ₁₁ corresponding to the first light guide area A ₁₁ , the second light source L ₁₂ corresponding to the second light guide area A ₁₂ , and the third light source L corresponding to the third light guide area A _{13 13} and the driving signal of the fourth light source L ₁₄ corresponding to the fourth light guide area A ₁₄ , the divisional brightness control can be performed.

Please refer to FIG. 7 again, the backlight module 3 of this embodiment also includes a multilayer optical film 31, which is arranged opposite to the light-emitting surface of the light guide plate, here, it is opposite to the light-emitting surface P ₁₁₁ of the first light guide plate P ₁₁ However, in this embodiment, the optical film 31 includes at least one diffuser sheet or a prism sheet to improve the optical properties of light, such as focusing, uniformity, directionality and the like. In addition, the backlight module 3 further includes a back plate 32 for accommodating the light guide plates P ₁₁ -P ₁₄ and the optical film 31 .

Referring to FIG. 8 and FIG. 7 , the manufacturing method of the backlight module according to the preferred embodiment of the present invention will be described below. The manufacturing method of this embodiment is used to manufacture the backlight module 3 of the above-mentioned embodiment, and the manufacturing method includes: Step S01 is to form at least two first light guiding regions A ₁₁ and at least one first non-conducting area A ₁₁ on the first light guiding plate P 11 Light area NA ₁₁ ; Step S02 is to set at least two first light sources L ₁₁ respectively corresponding to the first light guide area A ₁₁ ; Step S03 is to set a plurality of first dots or more on the first light guide area A ₁₁ a first microstructure; Step S04 is to arrange the second light guide plate _P12 relative to the first light guide plate _P11 ; Step S05 is to form at least two second light guide areas A12 and _A12 on the second light guide plate _P12 At least one second non-light guide area NA ₁₂ ; step S06 is to set at least two second light sources L ₁₂ respectively corresponding to the second light guide area A ₁₂ ; and step S07 is to set on the second light guide area A ₁₂ A plurality of second dots or a plurality of second microstructures.

In addition, in the present embodiment, steps S04 to S06 are repeated to arrange the third light guide plate _P13 and the fourth light guide plate _P14 relative to the second light guide plate _P12 . In addition, the manufacturing method of this embodiment also includes disposing the multilayer optical film 31 relative to the light-emitting surface of the light guide plate, here, relative to the light-emitting surface P ₁₁₁ of the first light guide plate P ₁₁ . In addition, the manufacturing method further includes accommodating the light guide plates P ₁₁ -P ₁₄ in the back plate 32 .

Since the manufacturing method of the backlight module of this embodiment has been described in the description of the backlight module 3 of the above embodiment, it will not be repeated here.

Referring to FIG. 9 , a liquid crystal display device 5 according to a preferred embodiment of the present invention includes a backlight module 3 and a liquid crystal panel module 4 , wherein the backlight module 3 has been described in detail in the foregoing embodiments, so it will not be repeated here. In addition, the liquid crystal panel module 4 is adjacent to the backlight module 3 and the former includes a liquid crystal display panel 41. Generally speaking, the liquid crystal display panel 41 includes a first substrate, a second substrate, and a substrate interposed between the first substrate and the second substrate. In addition, the liquid crystal display panel 41 also has peripheral circuits to control and drive the rotation of liquid crystal molecules in the liquid crystal layer. In this embodiment, the first substrate may be a transistor substrate, and the second substrate may be a color filter substrate.

In this embodiment, the light emitted by the backlight module 3 enters the liquid crystal display panel 41 and controls the transmittance of liquid crystal molecules in the liquid crystal layer to generate images. Wherein, the image data to be displayed is analyzed by the image processor in the liquid crystal display device 5 , and then the image is divided into multiple regions. In this embodiment, the image is divided into sixteen areas, and then brightness control of different areas is performed on the backlight module 3 according to the area data. Since the overall brightness of the light is determined by the brightness of the light emitted by the light sources L ₁₁ -L ₁₄ of the backlight module 3 and the transmittance of the liquid crystal molecules, when the image processor analyzes the image data of a certain partition, it can Adjust the power and the transmittance of the liquid crystal molecules to obtain the same brightness. For example, the power of the light source can be lowered, and the transmittance of the liquid crystal can be increased to obtain the same brightness.

In addition, in this embodiment, the liquid crystal panel module 4 may also include an outer frame 42, and the outer frame 42 is combined with the back plate 32 of the backlight module 3, so that the liquid crystal display panel 41 and the backlight module 3 are sandwiched between the outer frame 42 and the back light module. between plates 32 .

The following is the description of the manufacturing method of the liquid crystal display device according to the preferred embodiment of the present invention. The manufacturing method of this embodiment is used to manufacture the liquid crystal display device 5 of the above-mentioned embodiment, and in this embodiment, the manufacturing method of the backlight module of the above-mentioned embodiment can be followed. In addition to the manufacturing method of the backlight module of the above-mentioned embodiment, the manufacturing method of this embodiment also includes: setting the liquid crystal panel module 4 relative to the first light guide plate _P11 as shown in FIG. and combining the frame 42 with the back plate 32 to sandwich the liquid crystal display panel 41 of the liquid crystal panel module 4 and the backlight module 3 between the frame 42 and the back plate 32 .

In summary, according to a backlight module, liquid crystal display device and manufacturing method thereof of the present invention, at least two light guide regions and at least one non-light guide region are arranged on the light guide plate, and at least two light sources are respectively It is set corresponding to the light guide area, so each light guide area can control the brightness by adjusting the power or driving signal of the correspondingly set light source. In addition, the non-light-guiding area can serve as a buffer zone between the two light-guiding areas, thereby reducing the mutual influence of each light-guiding area. Compared with the known technology, the present invention can simultaneously realize brightness partition control and reduce the mutual influence of each partition, thereby reducing power consumption and improving contrast, and can increase the luminous efficacy of the backlight module.

The foregoing descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the scope of the appended claims.

Claims (6)

1. A backlight module, comprising: The first light guide plate has at least two first light guide regions and at least one first non-light guide region, wherein these first light guide regions have a plurality of first microstructures; At least two first light sources are respectively arranged corresponding to the first light guide regions; The second light guide plate has at least two second light guide areas and at least one second non-light guide area, the second light guide plate is opposite to the first light guide plate, and at least one first non-light guide area is connected to at least one A second light guide area is arranged opposite, wherein, these second light guide areas have a plurality of second microstructures; and At least two second light sources are respectively arranged corresponding to the second light guide areas. 2. The backlight module according to claim 1, wherein the density of the first microstructures closer to the first light sources is smaller than the density of the first microstructures farther away from the first light sources. 3. A liquid crystal display device, comprising: The backlight module has a first light guide plate and at least two first light sources. The first light guide plate has at least two first light guide areas and at least one first non-light guide area. The light guide regions are arranged correspondingly, wherein these first light guide regions have a plurality of first microstructures; and The second light guide plate has at least two second light guide areas and at least one second non-light guide area, the second light guide plate is opposite to the first light guide plate, and at least one first non-light guide area is connected to at least one a second light guide area is oppositely disposed; and At least two second light sources are respectively arranged corresponding to the second light guide regions, wherein the second light guide regions have a plurality of second microstructures; and The liquid crystal panel module is adjacent to the backlight module. 4. The liquid crystal display device according to claim 3, wherein the density of the first microstructures closer to the first light sources is smaller than the density of the first microstructures farther away from the first light sources. 5. A method of manufacturing a backlight module, comprising: forming at least two first light-guiding regions and at least one first non-light-guiding region on the first light-guiding plate; setting at least two first light sources respectively corresponding to the first light guide regions; setting a plurality of first microstructures on the first light guide regions; disposing the second light guide plate relative to the first light guide plate; forming at least two second light-guiding regions and at least one second non-light-guiding region on the second light-guiding plate; setting at least two second light sources respectively corresponding to the second light guide regions; A plurality of second microstructures are arranged on the second light guide regions; disposing the multilayer optical film relative to the light exit surface of the second light guide plate or the first light guide plate; and The first light guide plate or the second light guide plate is accommodated in the back plate, wherein at least one first non-light guide area on the first light guide plate is opposite to at least one second light guide area on the second light guide plate set up. 6. A method for manufacturing a liquid crystal display device, comprising: forming at least two first light-guiding regions and at least one first non-light-guiding region on the first light-guiding plate; setting at least two first light sources respectively corresponding to the first light guide regions; arranging the liquid crystal panel module relative to the first light guide plate; setting a plurality of first microstructures on the first light guide regions; disposing the second light guide plate relative to the first light guide plate; forming at least two second light-guiding regions and at least one second non-light-guiding region on the second light-guiding plate; setting at least two second light sources respectively corresponding to the second light guide regions; A plurality of second microstructures are arranged on the second light guide regions; disposing the multilayer optical film relative to the light exit surface of the second light guide plate or the first light guide plate; and The first light guide plate or the second light guide plate is accommodated in the back plate, wherein at least one first non-light guide area on the first light guide plate is opposite to at least one second light guide area on the second light guide plate set up.

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