WO2013078734A1

WO2013078734A1 - Backlight module and television set

Info

Publication number: WO2013078734A1
Application number: PCT/CN2011/084231
Authority: WO
Inventors: 宋志成; 乔明胜; 曹建伟
Original assignee: 青岛海信信芯科技有限公司
Priority date: 2011-12-01
Filing date: 2011-12-19
Publication date: 2013-06-06
Also published as: CN102518997B; CN102518997A

Abstract

A backlight module and a television set comprising the backlight module. The backlight module comprises a back plate (1), a diffuser plate (4), and a plastic frame (5). A support platform (11) is disposed at an opening of the back plate (1). The plastic frame (5) is mounted around the support platform (11), and is fixed on the support platform (11). The diffuser plate (4) is mounted on the support platform (11) and is fixed by the plastic frame (5). The diffuser plate (4) is supported by adjusting the contact area between the diffuser plate (4) and the support platform (11) and/or bonding the diffuser plate (4) on the support platform (11). The backlight module and the television set comprising the backlight module avoid the problems of the increased volume of the support, the shadow produced by the support in the backlight module, and the increased optical films incurred by the increased light mixing distance, thereby significantly decreasing the whole cost of the television set.

Description

Back group and electric technology field

The present invention relates to the field of electronic products, and in particular to a backlight module and a television set including the same. Background technique

At present, the backlight modules used in the television set include a bracket, as shown in FIG. 1 and FIG. 2, wherein 1 is a back plate, 3 is a light source, 4 is a diffusion plate, 5 is a plastic frame, and 9 is a bracket. In the backlight module of CCFL (Cold Cathode Fluorescent Lamp), the bracket 9 functions as a supporting diffuser 4 and a fixed CCFL light source 3; in a backlight module of a direct-emitting LED (Light Emitting Diode) In the group, the bracket 9 functions only to support the diffusion plate 4.

For the direct-lit LED backlight module, in order to reduce the number of light sources 3 (ie, LED lights), it is necessary to increase the light mixing distance of the backlight module, because in the direct-lit LED backlight module, it is necessary to support the bracket 9 The height of the diffuser plate 4 and the light mixing distance of the bracket 9 are equal, so that the increase of the light mixing distance requires the correspondingly increased bracket 9 to support the diffuser plate 4. As shown in FIG. 3 and FIG. 4 (wherein the area indicated by reference numeral 10 is a shadow area), the higher the height of the bracket 9 is, the larger the volume thereof is. The large-sized bracket 9 is generated in the backlight module. A larger shadow 10 (a dark shadow in the circular cymbal that affects the uniformity of the diffuser 4). If the shadow 10 is to be eliminated, the optical film needs to be added, and the addition of the optical film increases the cost of the backlight module, thereby increasing the cost of the television.

Therefore, it is necessary to provide a new backlight module, which effectively solves the problem of increased cost of the backlight module and the television set caused by the shadow in the backlight module. Summary of the invention

In view of the above, the technical problem to be solved by the present invention is to provide a new backlight module, which can effectively avoid the increase of the volume of the bracket caused by the increase of the light mixing distance, the shadow of the bracket in the backlight module, and the increase of the optical film. The problem of filming and thus increasing costs arises.

In one aspect, the present invention provides a backlight module including a back plate, a diffusion plate, and a plastic frame. The open end of the back plate is provided with a support platform, and the plastic frame is installed around the support platform and fixed at the same. On the support platform, the diffusion plate is mounted on the support platform and fixed by the plastic frame, by adjusting the diffusion plate and the support platform on the back plate The area of the contact portion and/or the diffusion plate is adhered to the support platform to support the diffusion plate.

In another aspect, the present invention also provides a television set including a display panel and the backlight module described above.

The backlight module of the above technical solution has the following beneficial effects: The backlight module provided by the present invention adjusts the width of the contact portion of the diffusion plate with the support platform on the back plate and/or pastes the diffusion plate Supporting the diffusion plate on the support platform eliminates the bracket in the backlight module such as the original direct-type LED, completely eradicating the hidden danger of the shadow, and ensuring the same mixing as the backlight module with the bracket. Light distance; On the other hand, after removing the bracket, it can be more flexible in terms of structural design and optical architecture design. In terms of structural design, there is no need to provide a bracket on the bottom surface of the backboard, which makes the structure of the backboard more compact and more space-oriented. Ample, increased structural design flexibility; In the optical architecture design, because the shadow caused by the bracket is avoided, the optical diaphragm combination design for eliminating the shadow is simplified, and the optical architecture design does not need to be considered. The shadow problem caused by the bracket makes the optical frame design more flexible and beneficial. The backlight module of the overall architecture design; mixed light while saving the membrane composition, further simplifies the design, cost savings.

The television set in the above technical solution has the following beneficial effects: The television set provided by the invention saves the overall design and installation more conveniently because the bracket in the backlight module is omitted, and the cost of the whole machine is saved, and the bracket is generated. The shadow problem makes the brightness of the backlight module stronger, and the display effect of the TV is better; the bracket in the backlight module is omitted, the weight of the backlight module and the weight of the television are effectively reduced, and the whole interior is made at the same time. The components are reduced, the interference between the components is reduced, the performance of the whole machine is more stable and reliable, and the whole machine is packaged, moved, placed and transported. DRAWINGS

1 is a schematic view showing the mounting of a bracket in a backlight module in the prior art;

Figure 2 is a top plan view of the structure shown in Figure 1;

3 is a schematic view of a bracket supporting a diffusion plate in a backlight module in the prior art;

Figure 4 is a schematic view showing the shadow of the stent shown in Figure 3 on the diffusion plate;

5 is a schematic cross-sectional view showing an embodiment of a backlight module according to the present invention;

Figure 6 is an enlarged view of a portion B of Figure 5;

7 is a schematic cross-sectional view showing still another embodiment of a backlight module according to the present invention;

Figure 8 is an enlarged view of a portion A in Figure 7. detailed description

In order to more clearly understand the above objects, features and advantages of the present invention, the following detailed description The invention is further described in detail.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention, but the invention may be practiced in other embodiments other than those described herein. limits.

Embodiment 1:

5 and FIG. 6 are schematic structural diagrams of an embodiment of a backlight module according to the present invention.

As shown in FIG. 5 and FIG. 6 , an embodiment of the present invention provides a direct-type LED backlight module, including an open back plate 1 , a reflective sheet 2 , an LED light source 3 , a diffusing plate 4 , and a plastic frame 5 . The inner surface of the back plate 1 is provided with the reflective sheet 2, and the LED light source 3 is installed at the bottom of the back plate 1 and passes through the reflective sheet 2. The open end of the back plate 1 is disposed. The support frame 11 is mounted on the support platform 11 and fixed on the support platform 11 . The diffusion plate 4 is mounted on the support platform 11 and fixed by the plastic frame 5 . The diffusion plate 4 is supported by adjusting the area of the contact portion of the diffusion plate 4 with the support platform 11 on the back plate 1.

Preferably, each side of the diffusing plate 4 is in contact with each side of the supporting platform 11 respectively, so that the contact area of the diffusing plate 4 and the supporting platform 11 can be ensured to be larger, and the bracket can be ensured to the greatest extent. The diffusing plate 4 still has high strength and is not deformed under the condition; at the same time, the contact area of the diffusing plate 4 and the supporting platform 11 can maintain the mixing distance equal to the mixing distance of the original mixing module with the bracket, Get the same blending effect. In this arrangement, the support platform 11 is formed by flapping around the back panel 1.

Of course, the opposite sides of the diffusion plate 4 are respectively in contact with the corresponding two sides of the support platform 11, so that the structure of the support platform 11 is simpler, and only the support platform 11 is disposed on opposite sides of the back plate 1 to reduce the support. The processing difficulty and material usage of the platform 11 reduce the material cost and at the same time ensure good support strength. This solution is to form the support platform 11 on the opposite sides of the back panel 1.

Compared with the prior art shown in FIG. 1 to FIG. 4, the direct-lit LED backlight module provided by the embodiment of the present invention completely removes the bracket 9 because the bracket 9 only supports the diffusion in the direct-lit LED backlight module. The effect of the plate 4 is that after the support 9 is removed, the solution is required to support the diffusion plate 4. The solution provided by the embodiment is: by adjusting the diffusion plate 4 and the support platform 11 on the back plate 1 The area of the contact portion (including the width and length) to support the diffusion plate 4. This method is highly operable, and is more conducive to the overall architecture design of the backlight module, which significantly reduces the production cost of the backlight module.

In this embodiment, both the plastic frame 5 and the diffuser plate 4 are supported by the back plate 1 and the support width (the total width of the L1+L2) is constant. In the design of the backlight module with the bracket 9, as long as the pair is guaranteed The support width of the diffuser (ie, the length of the L1 section) is about 3 mm to meet the support requirements.

In the direct type LED backlight module provided by the embodiment of the present invention, since the bracket 9 is removed, in order to ensure diffusion The mounting reliability of the board 4 on the backboard 1 is comparable to that of the bracket 9. The solution used in this embodiment is: the diffusing plate 4 and the contact portion of the backing plate 1 supporting the platform 11 Width not less than the width of the diffusion plate 4

1%.

For a 37-inch LCD TV with an aspect ratio of 16:9, the size of the diffuser should be slightly larger than the size of the display. For the sake of convenience, the size of the diffuser is equal to the size of the display. The 37-inch (16:9 aspect ratio) diffuser has a width of 817.6 mm and a height of 459.9 mm. According to a preferred embodiment of the present invention, the contact portion of the 37-inch diffuser 4 and the backing plate 1 on the support platform 11 The width (i.e., the length of L1) is at least 8.176 mm (817.6 mm 1 = 8.176 mm), and this width can ensure the mounting reliability and rigidity of the diffusion plate 4 without the bracket 9. The specific ratio can also be determined according to actual production requirements and the thickness of the diffuser.

In the prior art, in the case of the backlight module of 32 inches and 32 inches or less, the thickness of the diffusion plate 4 is mostly 1.25 mm, and the diffusion module products of 37 inches and 37 inches or more are diffused. The thickness of the plate 4 is mostly 1.5 mm, and since the support plate 9 is supported directly under the diffusion plate 4 (as shown in Fig. 3), the diffusion plate 4 having such a thickness can ensure the reliability and strength of the mounting.

In the direct-type LED backlight module provided by the embodiment of the present invention, since the bracket 9 is removed, the diffusion plate 4 is suspended, and if the backlight module is designed according to the original thickness, the reliability of the diffusion plate 4 is greatly reduced. It is easy to break and break, and the inventors have experimentally verified that by making the thickness of the diffusing plate of 32 inches and 32 inches or less not less than 1.5 mm, 37 inches, and 37 inches or more, the thickness of the diffusing plate is not less than 2 mm. The strength and mounting reliability of the diffusion plate are ensured in the case where the bracket 9 is removed.

Preferably, the diffusing plate 4 is a light transmitting flat plate having a uniform thickness.

In a preferred embodiment provided by the present invention, the plastic frame 5 is fixed to the support platform 11 by screws 30 and the diffusion plate 4 is clamped.

Preferably, the light exiting side of the diffusing plate is further provided with an optical film 6.

The optical film is also not limited to the brightness enhancement mode, and may also be a diffusion sheet, a prism sheet, a brightness enhancement film or any combination thereof. The optical film finally selected in the production process is determined according to the requirements of the optical brightness index. .

Since the direct-type LED backlight module provided by the embodiment of the present invention removes the bracket 9 , the occurrence of shadow on the diffuser panel 4 is completely avoided, and the uniformity of the light-emitting side of the diffuser panel 4 is higher, and no additional increase is required. The light mixing sheet saves the cost of the light mixing sheet. Since the light-mixing distance is increased, the brightness of the light-emitting side of the diffusing plate 4 is lowered. In this case, only the brightness-increasing film is provided in the optical film 6 to increase the brightness of the light-emitting side, which satisfies the brightness requirement of the direct-lit LED backlight module.

Further, the plastic frame 5 is further provided with a pressing piece 51, and the pressing piece 51 presses and fixes the diffusion sheet 4 and the optical film 6.

A liquid crystal panel 7 is disposed above the pressing piece 51, and the liquid crystal panel is fixed by the front frame 8. Further, the support platform 11 and the backing plate 1 are integrally formed. The processing method is simple in operation, does not require machining, saves processing costs, and has a higher structural strength, which can improve the reliability of the backlight module and the whole set of the television. Embodiment 2:

7 and FIG. 8 are schematic structural views of still another embodiment of a backlight module according to the present invention.

As shown in FIG. 7 and FIG. 8 , another embodiment of the present invention provides another direct-lit LED backlight module, including an open back plate 1 , a reflective sheet 2 , an LED light source 3 , a diffusing plate 4 , and a glue The inner surface of the back plate 1 is provided with the reflection sheet 2, and the LED light source 3 is installed at the bottom of the back plate 1 and passes through the reflection sheet 2, and the opening of the back plate 1 The end is provided with a support platform 11 , and the plastic frame 5 is mounted around the support platform 11 and fixed on the support platform

11 , the diffusion plate 4 is mounted on the support platform 11 and fixed by the plastic frame 5 by supporting the diffusion plate 4 on the support platform 11 to support the diffusion plate 4 .

The sides of the diffuser plate 4 are respectively in contact with the respective sides of the support platform 11 and are pasted on the respective sides of the support platform 11. In this way, it is ensured that the contact area of the diffusion plate 4 and the support platform 11 is larger, and the diffusion plate 4 can be ensured to have a high strength without deformation under the condition of no support; and the diffusion plate 4 and the support platform 11 are simultaneously The large contact area can also maintain the mixing distance equal to the mixing distance of the original light mixing module with the bracket, and obtain the same light mixing effect. In this arrangement, the support platform 11 is formed by flanging around the back panel 1.

Of course, it is also possible that the opposite sides of the diffusion plate 4 are respectively in contact with the corresponding two sides of the support platform 11 and are pasted on the corresponding two sides of the support platform 11, so that the structure of the support platform 11 is simpler, only in the back plate 1 The support platform 11 can be disposed on opposite sides, which reduces the processing difficulty and material dosage of the support platform 11, and can also save the amount of double-sided tape, further reduce the material cost, and at the same time ensure good support strength. This solution is to form the support platform 11 on the opposite sides of the backboard 1.

Compared with the prior art shown in FIG. 1 to FIG. 4 , the direct-type LED backlight module provided in this embodiment completely removes the bracket 9 , because the bracket only supports the diffusion plate 4 in the direct-lit LED backlight module. The effect of the removal of the bracket 9 requires the use of another solution to support the diffusion plate 4. The solution provided by the embodiment is: supporting the diffusion plate by attaching the diffusion plate 4 to the support platform 11 4. Further, the thickness of the diffusion plate 4 is appropriately increased to enhance the strength and reliability of the diffusion plate 4.

In the direct type LED backlight module provided in this embodiment, the strength of the diffusion plate 4 can be ensured by referring to the following principles: the thickness of the diffusion plate of 32 inches and 32 inches or less is not less than 1.5 mm, 37 inches and 37 inches or more. The thickness of the diffusion plate is not less than 2 mm.

Preferably, the diffusion plate 4 is adhered to the support platform 11 on the backboard 1 by a double-sided tape 20. double The cost of the face tape 20 is lower than that of the bracket 9, and the operation is more convenient. It is not necessary to provide the bracket 9 on the backboard 1, which reduces the number of processes and reduces the processing difficulty. The function of the double-sided tape 20 is to integrally connect the diffusion plate 4 with the support platform 11, increase the pulling force to the diffusion plate 4, prevent the central portion of the diffusion plate 4 from sagging, and maintain the flatness of the diffusion plate 4.

Of course, the diffusion plate 4 can also be attached to the support platform 11 by using other colloids or methods, such as liquid glue. In this embodiment, the width of the double-sided tape 20 may be equal to the length of the ll segment or less than the length of the ll segment under the condition that the support width (the total width of ll + l2) is constant. Under the premise of ensuring the strength and reliability of the diffusion plate, the width of the double-sided tape 20 is less than the length of the ll segment, which can further reduce the production cost of the backlight module. Embodiment 3:

This embodiment is basically the same as the first embodiment and the second embodiment, and the difference is that:

The embodiment provides another direct-type LED backlight module, including an open back plate 1, a reflective sheet 2, an LED light source 3, a diffusing plate 4, and a plastic frame 5. The inner surface of the back plate 1 is provided with The reflective sheet 2, the LED light source 3 is mounted on the bottom of the backboard 1 and passes through the reflective sheet 2. The open end of the backboard 1 is provided with a supporting platform 11, and the plastic frame 5 is installed. The diffusion plate 4 is mounted on the support platform 11 and fixed by the plastic frame 5 by adjusting the diffusion plate 4 and the back. The area of the contact portion of the support platform 11 on the board 1 and the diffusion plate 4 are pasted on the support platform 11 to support the diffusion plate 4.

This solution is more flexible than the first embodiment and the second embodiment. For the first embodiment, only the support width of the diffusion plate 4 and the support platform 11 is adjusted to support the diffusion plate, and the size of the diffusion plate 4 gradually increases. Increasing (the size of the diffuser plate 4 gradually increases with the size of the liquid crystal panel), the support width of the diffuser plate 4 on the support platform 11 is also gradually increased, which makes the front bezel of the television set wider, affecting the whole of the television set. The aesthetics will also increase the cost of the frame because the front frame of the TV is wider, thereby increasing the overall cost of the TV.

For the second embodiment, the solution of sticking the diffusion plate 4 on the support platform 11 and the adjustment diffusion plate 4 have the same effect as the support area of the support platform 11, and therefore, combining the two solutions can significantly improve the diffusion plate. The reliability of the support.

The support width of the 37-inch (width-to-height ratio 16:9) diffuser plate given in the first embodiment is 8.676 mm. In this embodiment, since the scheme of the first embodiment and the scheme of the second embodiment are combined, Under the premise that the diffusion plate 4 is adhered to the support platform 11 by the double-sided tape 20, the support width of the diffusion plate 4 on the support platform 11 can be adjusted to 5-7 mm, thus reducing the support strength while reducing the support strength. The width of the front frame of the TV saves production costs and makes the appearance of the TV more beautiful.

For the solution of the second embodiment, in some products with low requirements on the width of the front frame, the support of the diffusion plate 4 can be supported. The width is appropriately increased while reducing the width of the double-sided tape 20, which not only ensures the support strength of the diffusion plate, but also appropriately reduces the cost of the double-sided tape 20.

In summary, the combination of the above two schemes can more flexibly design the structure of the direct-lit LED backlight module, so that after the bracket 9 is removed, the diffuser panel 4 still has good strength and reliability, effectively Solve the problem of shadow and cost increase caused by the bracket. Embodiment 4:

The present invention also provides a television set comprising the above-described direct type LED backlight module and display panel.

The television provided by the invention adopts the above-mentioned direct-type LED backlight module, which makes the structure of the backlight module simpler, completely avoids the problem of shadow and cost increase caused by the bracket, and at the same time, saves the bracket, saves The addition of the light mixing sheet in the optical film has reduced the material cost and installation cost of the television, and can significantly improve the market competitiveness of the television product.

It should be understood by those skilled in the art that the present invention completely avoids the problem of increased shadow and optical film cost caused by the bracket by removing the bracket in the direct-lit LED backlight module, and at the same time, the present invention also provides three kinds of removal. Supporting and fixing scheme of the rear diffuser of the bracket, the above three solutions can well solve the problem of supporting the diffuser in the unsupported backlight module, and removing the influence of the shadow by removing the bracket and adjusting the diffusing plate 4 and the back The width of the contact portion of the support platform 11 on the board 1 and/or the manner in which the diffusion plate 4 is adhered to the support platform 11 to support the diffusion plate 4 should be included in the scope of protection of the present invention. Inside.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A backlight module, comprising a back plate, a diffusion plate, and a plastic frame, wherein the open end of the back plate is provided with a support platform, and the plastic frame is installed around the support platform and fixed on the On the support platform, the diffusion plate is mounted on the support platform and fixed by the plastic frame, by adjusting the area of the contact portion of the diffusion plate with the support platform on the back plate and/or The diffusion plate is attached to the support platform to support the diffusion plate.

The backlight module according to claim 1, wherein a width of the contact portion of the diffusion plate and the support platform on the back plate is not less than 1% of a width of the diffusion plate.

The backlight module according to claim 1, wherein the diffusion plate is adhered to the support platform on the back plate by a double-sided tape.

The backlight module according to claim 1, wherein each side of the diffusion plate is in contact with each side of the support platform and is adhered to the sides of the support platform.

The backlight module according to claim 1, wherein the support platform and the back plate are integrally formed.

The backlight module according to any one of claims 1 to 5, wherein the plastic frame is fixed to the support platform by screws and the diffusion plate is clamped.

The backlight module according to claim 6, wherein an optical film is further disposed on a light emitting side of the diffusing plate.

8. The backlight module of claim 7, wherein the optical film is a brightness enhancement film.

The backlight module according to claim 7, wherein the plastic frame is further provided with a pressing piece, and the pressing piece presses and fixes the diffusion piece and the optical film.

A television set, comprising a backlight module and a display panel, wherein the backlight module is the backlight module according to any one of claims 1 to 9.