TWI634355B - A back light module, an assembly method of the back light module, and a method for manufacturing light guide plate - Google Patents

Abstract

The invention provides a backlight module, a method for assembling the backlight module, and a method for manufacturing the light guide plate. When assembling, a light guide plate having a vertically adjacent surface and a light incident surface is first provided, and the surface is covered with a protective film , The protective film has a retaining portion and a tearing portion adjacent to each other through a cutting line, and the retaining portion is disposed adjacent to the light incident surface; then a light bar is provided corresponding to the light incident surface, and the tearing portion is removed along the cutting line, The retention part is left on the surface, thereby the overall assembly rate can be improved and the backlight module can effectively eliminate hot spots. After the protective film is covered on the surface, the light guide plate can form at least one cutting line on the protective film through laser processing to quickly and accurately separate the retaining part and the tearing part from the protective film to improve the process efficiency.

Description

Backlight module, method for assembling backlight module and method for manufacturing light guide plate

The invention relates to the field of backlight modules, in particular to a backlight module, a method for assembling the backlight module, and a method for manufacturing the light guide plate.

The backlight module is an optical product that can be used in a display device. It guides a point light source to form a uniform surface light source, so as to provide the light required by the display panel, and then achieve the purpose of displaying a picture.

The backlight module generally refers to a module product that guides the light of the point light source to form the light of the surface light source through the light guide element. In practical applications, due to the light-emitting characteristics of the point light source, the backlight module is prone to produce uneven light-out states, also known as hot spots, which affects the display of the display screen. In order to solve the hot spot phenomenon, the backlight module can be further equipped with optical elements such as diffusion sheets and prism sheets. The diffuser, also known as a diffuser plate or diffuser film, is a plate body and is additionally provided on the light exit side of the light guide element. The main purpose of the diffuser is to make the light emitted by the light guide plate more evenly distributed and slow down the backlight module supply. The light of the display panel is too uneven to affect the display performance of the screen. However, regardless of whether it is a diffuser, a diffuser plate, or a diffuser film, it refers to an optical element that is additionally added independently of the light guide element.

However, although the addition of optical components as described above in the backlight module can allow the backlight module to have better optical adjustment and make the light extraction effect more in line with the application requirements, based on production cost considerations, the addition of components will inevitably increase the cost. , It also has more assembly steps with additional optical components, The assembly efficiency is reduced. Therefore, how to make the backlight module meet the optical performance and cost considerations is a problem that the related manufacturers need to overcome at present.

In view of this, the present inventors conceived a backlight module, a method for assembling the backlight module, and a method for manufacturing the light guide plate, in order to effectively improve the deficiency of the existing backlight module.

An object of the present invention is to provide a backlight module, a method for assembling a backlight module, and a method for manufacturing a light guide plate, which can reduce material costs and improve assembly efficiency, while enabling the backlight module to effectively eliminate hot spots during application phenomenon.

In order to achieve the above object, the present invention provides a method for assembling a backlight module in one embodiment, which includes the following steps: providing a light guide plate, the light guide plate having a surface and a light incident surface, and the surface and the light incident surface For vertical abutment, the surface is covered with a protective film, the protective film has a retaining portion and a tearing portion, the retaining portion and the tearing portion are adjacently disposed through a cutting line, and the retaining portion is adjacent to the The light incident surface is provided; a light bar is provided corresponding to the light incident surface; and the tearing portion is removed along the cutting line to leave the retaining portion on the surface. This can effectively improve the assembly efficiency, at the same time reduce the cost of the backlight module, and can have better light output performance in subsequent applications.

The present invention also discloses a backlight module in another embodiment, which includes: a light guide plate having a surface and a light incident surface, and the surface and the light incident surface are vertically adjacent to each other; a reserved portion, the The reserved part is a film, which is attached to the surface and is arranged adjacent to the light incident surface, wherein the reserved part is a part of a protective film after removing a tearing part along a cutting line; and a light bar, right The light incident surface should be provided to form side incident light relative to the light guide plate; wherein, after the light guide plate and the light bar are assembled with each other, the retention portion is left on the surface to achieve the effect of eliminating hot spots.

Based on the foregoing two embodiments, in one embodiment, it is disclosed that a frame is further disposed on the side of the light bar and the light guide plate to fix the light bar and the light guide plate, and one end of the frame is pressed against the reserved To strengthen the relative fixing of the light bar and the light guide plate.

In another embodiment, the surface of the retention portion has a plurality of optical particles to atomize light and enhance the elimination of hot spots.

In addition, the present invention also provides a method for manufacturing a light guide plate in one embodiment, including the following steps: providing a light guide plate; covering a surface of the light guide plate with a protective film; and forming the protective film through laser processing At least one cutting line, so that the protective film has at least one retaining portion and at least one tearing portion corresponding to the cutting line, the retaining portion and the tearing portion are adjacent to each other through the cutting line, thereby making it possible to quickly produce a better The light guide plate with part of the protective film can be removed in product yield.

In another embodiment, the cutting line can be formed by laser interval sintering processing, and the cutting line is composed of a plurality of melting melting points formed by laser processing.

In yet another embodiment, it is disclosed that after the laser processing forms the cutting line, the light guide plate is cut to the required size through the laser, by which the light guide plate can be quickly and accurately cut to a specified size, and Can be implemented on the same production line.

In summary, the backlight module, the method for assembling the backlight module and the method for manufacturing the light guide plate provided by the present invention provide products and manufacturing methods that have excellent light output efficiency and effectively reduce costs. Through the structure and assembly method of leaving a part of the protective film on the light guide plate during assembly, in addition to effectively eliminating hot spots during application, it can also effectively reduce product costs. On the other hand, it also has better efficiency in assembly. For this kind of light guide plate that wants to retain part of the protective film, the present invention also proposes a manufacturing method with high production efficiency and product yield.

1‧‧‧Backlight module

10‧‧‧Light guide plate

101‧‧‧Surface

102‧‧‧entrance

11‧‧‧Protection film

111‧‧‧Reservation Department

1111‧‧‧Optical particles

112‧‧‧Tear off

113‧‧‧Cut line

1131‧‧‧Burn melting point

12‧‧‧Light bar

13‧‧‧Frame

10’‧‧‧Light guide plate

S01 ~ S08‧‧‧Step

Figure 1 is a flow chart of the steps of the assembly method according to the first embodiment of the present invention.

FIG. 2A is a schematic diagram (1) of the assembly steps of the first embodiment of the present invention.

Figure 2B is a schematic diagram (2) of the assembly steps of the first embodiment of the present invention.

Figure 2C is a schematic diagram (3) of the assembly steps of the first embodiment of the present invention.

FIG. 3 is a schematic diagram of the assembled backlight module according to the first embodiment of the present invention.

FIG. 4 is a flow chart of the assembly method of the second embodiment of the present invention.

FIG. 5A is a schematic diagram of a light guide plate according to a second embodiment of the invention.

FIG. 5B is a schematic diagram of the assembled backlight module according to the second embodiment of the present invention.

FIG. 6 is a flowchart of steps of a manufacturing method according to a third embodiment of the present invention.

FIG. 7A is a schematic diagram (1) of the manufacturing steps of the third embodiment of the present invention.

FIG. 7B is a schematic diagram (2) of the manufacturing steps of the third embodiment of the present invention.

Fig. 8 is a flowchart of steps in the manufacturing method according to the fourth embodiment of the present invention.

Fig. 9 is a schematic diagram of manufacturing steps in a fourth embodiment of the present invention.

As mentioned above, in order to make the backlight module have a uniform light output efficiency, and at the same time can effectively reduce the production cost, the inventor conceived and proposed the technical content described in the following embodiments, to retain some of the application and concept of protective film, Better optical products and assembly and manufacturing methods. Please refer to FIGS. 1, 2A to 2C, and 3, which are flowcharts of assembly steps of the first embodiment of the present invention, schematic diagrams of each assembly step, and schematic diagrams of the backlight module after assembly. The present invention provides a method for assembling the backlight module 1, which includes the following steps.

First, a light guide plate 10 is provided, wherein the light guide plate 10 has a surface 101 and a light incident surface 102, and the surface 101 and the light incident surface 102 are vertically adjacent to each other, and the surface 101 is covered with a protective film 11. The protective film 11 has a retaining portion 111 and a tearing portion 112. The retaining portion 111 and the tearing portion 112 are disposed adjacent to each other through a cutting line 113, and the retaining portion 111 is disposed adjacent to the light incident surface 102 (step S01). Wherein, the light incident surface 102 is used to receive light, so that the light enters the light guide plate 10 and is guided to form light. Preferably, the light guided and adjusted inside the light guide plate 10 can emit light on the aforementioned surface 101. In order to destroy the total reflection of the light inside the light guide plate 10, on the surface 101 of the light guide plate 10 or the other surface opposite to the surface 101, optical microstructures like dots (not shown) can be provided to facilitate the light guide The light inside the optical panel 10 is adjusted by the optical microstructure to emit light, but this is a common technology in the industry, so it will not be repeated here.

Next, a light bar 12 is provided corresponding to the light incident surface 102 (step S02). Preferably, the light bar 12 may be a structure in which a plurality of LEDs are arranged on the circuit board at intervals. Then, the tearing part 112 is removed along the cutting line 113, and the retaining part 111 is left on the surface 101 (step S03) to complete the assembly of the backlight module 1. In this way, the backlight module 1 can be quickly assembled and produced, and the backlight module 1 can achieve the effect of eliminating hot spots by leaving the reserved portion 111 of the light guide plate 10. The steps of the assembly method are not limited to the sequence described in this embodiment. For example, steps S02 and S03 can also be swapped with each other, and the strip 12 can be placed on the light-incident surface 102 after the tear-off portion 112 is removed. Complete assembly.

For example, as shown in FIG. 2A, the surface 101 of the light guide plate 10 is covered with a protective film 11, and the retaining portion 111 is disposed adjacent to the light incident surface 102, and a cutting line passes between the retaining portion 111 and the tearing portion 112 113 adjacency settings. After the light bar 12 is correspondingly disposed on the light incident surface 102 side, the tearing portion 112 of the protective film 11 can be removed along the cutting line 113, as shown in FIG. 2B. Splice A part of the protective film 11 that is the retention portion 111 is left on the light guide plate 10 as shown in FIG. 2C. Therefore, after the light from the light bar 12 enters the light guide plate 10 from the light incident surface 102, the effect of eliminating uneven brightness and darkness can be achieved by the structure of the retaining portion 111.

In particular, in this embodiment, the protective film 11 covered on the light guide plate 10 can achieve the effect of preventing damage to the surface of the light guide plate 10 before assembly, and part of the protective film 11 is removed during assembly And, by retaining the portion 111 left on the light guide plate 10, the effect of eliminating hot spots is achieved. In other words, when assembling the backlight module, compared with the usage method of tearing off and discarding it, the technical content disclosed here is an application that requires the protective film to be completely torn off. The protective film 11 is left on the light guide plate 10, which can not only increase the assembly speed and eliminate hot spots in subsequent use, but also reduce the requirement and cost of the backlight module 1 to add other optical components. As for the light guide plate 10 with the tear-off part of the protective film 11 applied in this embodiment, the inventor has also proposed its corresponding manufacturing method. This part will be described in detail later.

The assembled backlight module 1 structure, as shown in FIG. 2C or 3, includes a light guide plate 10, a retention portion 111, and a light bar 12. As described above, the light guide plate 10 has a light incident surface 102 and a surface 101, and the retention portion 111 is a part of the protective film 11 after removing the tear-off portion 112 along the cutting line 113, and is a film structure that is attached to the area of the surface 101 adjacent to the light incident surface 102, and the light bar 12 is provided corresponding to the light incident surface 102. The side entrance light can be formed relative to the light guide plate 10, whereby the aforementioned backlight module 1 can be left on the reserved portion 111 of the surface 101 to achieve the effect of eliminating hot spots.

Please continue to refer to Figures 4, 5A and 5B, which are a flow chart of the assembly method, a schematic diagram of the light guide plate and a schematic diagram of the backlight module after assembly in the second embodiment of the present invention. Based on the foregoing, after removing the tear-off portion 112, a frame 13 may be further assembled on the side of the light bar 12 and the light guide plate 10, and one end of the frame 13 is pressed against the retaining portion 111 (step S04) to fix the lamp Strip 12 with light guide The board 10, and the frame 13 pressed against the retaining portion 111 can also achieve the effect of fixing the retaining portion, as shown in FIG. 5B. In addition, in order to improve the elimination effect of the hot spot phenomenon, in this embodiment, it is disclosed that the surface of the retaining portion 111 has a plurality of optical particles 1111 to achieve the effect of atomizing light, and the hot spot phenomenon can be more accurately eliminated and the overall light emission can be uniformly See Figure 5A. The assembled backlight module 1 structure further includes a frame 13 disposed on the side of the light bar 12 and the light guide plate 10 to fix the light bar 12 and the light guide plate 10, and the surface of the retention portion 111 has optical particles 1111 , See Figures 5A and 5B. Wherein, the light bar 12 can be fixed on the frame 13 to achieve the effect of fixing the position of the light bar 12 and the distance from the light incident surface 102 by the frame 13. Moreover, preferably, the material of the frame 13 may be a light-shielding material to prevent the light of the light bar 12 from leaking to the outside and reduce the loss of light.

Please refer to FIGS. 6 and 7A-7B, which are flowcharts of manufacturing methods and schematic diagrams of the manufacturing steps according to the third embodiment of the present invention. The invention also discloses a method for manufacturing a light guide plate, which includes the following steps. First, a light guide plate 10 'is provided (step S05), and a protective film 11 is successively coated on a surface 101 of the light guide plate 10' (step S06). Finally, at least one cutting line 113 is formed on the protective film 11 by laser processing, so that the protective film 11 has at least one reserved part 111 and at least one tearing part 112 according to the cutting line 113, and the retaining part 111 and the tearing part 112 pass through the cutting line 113 are adjacent to each other (step S07). In this way, by covering the light guide plate 10 'with the protective film 11, and then processing to form the cutting line 113, the positions of the retaining portion 111 and the tearing portion 112 on the finished light guide plate can be made quite accurate, except Improve process efficiency and product yield. After the light guide plate product is made, the cutting line 113 of the protective film 11 is first used to form a part to be removed and to be retained, which can also improve its efficiency in subsequent assembly. Here, the light guide plate 10 'mentioned herein refers to a plate material for performing coating and processing of the protective film 11. In practical application, the light guide plate 10 'can be a plate body that has conformed to the factory size or an elongated plate body that still needs to be cut. When the light guide plate 10' is a plate that meets the size When the body is cut, the cutting line 113 can be formed by laser to form a light guide plate product for use in a backlight module. When the light guide plate 10 'is an elongated plate body, it can be cut to the desired size after covering with the protective film 11, and then a cutting line 113 is formed on the protective film 11 through the laser, which is used in this embodiment For example. Of course, the cutting line 113 can also be formed on the protective film 11 and then cut. This part will be described in detail later.

The light guide plate 10 made by the aforementioned method can be combined with reference to FIG. 2A or 5A. This kind of light guide plate 10 with a part of the protective film 11 can be removed, because part of the protective film 11 needs to be removed in the subsequent assembly process, and The protective film 11 adjacent to the light incident surface 102 is left on the light guide plate 10, so that the position of the protective film 11 and the cutting line 113 on the light guide plate 10 needs to be quite accurate to avoid affecting the light output performance of subsequent applications. In order to make the light guide plate 10 that is assembled to form the aforementioned backlight module, the inventors initially formed a cutting line on the protective film, and then overlaid the protective film with the cutting line on the light guide plate for production. However, this method needs to be aligned with the light guide plate one by one when attaching the protective film to ensure that when the light guide plate is assembled to form the backlight module, a certain size of protective film is left near the light entrance surface, so it is greatly reduced The production efficiency of the light guide plate may even cause the protective film left on the light guide plate to shift due to the misalignment of the lamination, which affects the subsequent light output performance and other problems. Therefore, the inventor continued to conceive how to efficiently manufacture a light guide plate 10 with a removable protective film that satisfies the aforementioned requirements, and then proposes to first coat the protective film 11 on the light guide plate 10 'and then process it through laser processing The method of cutting the protective film 11 to form the cutting line 113 can accurately control the formation of the cutting line 113 at the desired position, to avoid the position of the protective film 11 on the subsequent light guide plate products from shifting, and at the same time greatly improve the process rate.

Preferably, the cutting line 113 can be formed by laser processing at equal intervals, so in this embodiment, the cutting line 113 on the protective film 11 is a complex formed by laser processing Composed of several burning point 1131.

Please refer to FIG. 8 and FIG. 9, which are a flowchart of manufacturing steps and a schematic diagram of manufacturing steps according to the fourth embodiment of the present invention. Here, it is disclosed that after the laser processing forms the cutting line 113, the light guide plate 10 'can be cut through the laser to a desired size (step S08). Here, it is disclosed that after the cutting line 113 of the protective film 11 on the light guide plate 10 'is formed, the sheet is cut to the required size through laser, and then the light guide plate 10 that can be assembled into the backlight module is made. The cut surface of the laser cutting can form the light incident surface of the light guide plate 10. This method has a fast and accurate cutting effect, and can be made at the same time on the same production line.

In summary, the backlight module, the method for assembling the backlight module and the method for manufacturing the light guide plate proposed by the present invention are structures and methods that leave part of the protective film on the light guide plate to provide excellent light output efficiency and effectively reduce Cost-effective products and assembly and manufacturing methods can not only eliminate hot spots during application, but also eliminate the need for additional optical components for the backlight module to obtain better light output performance, thereby effectively reducing product costs. In terms of assembly, it also has better efficiency in assembly.

Claims (9)

A method for assembling a backlight module includes the following steps: providing a light guide plate having a surface and a light incident surface, and the surface and the light incident surface are vertically adjacent to each other, and the surface is covered with a protective film , The protective film has a reserved part and a tear-off part, the reserved part and the tear-off part are arranged adjacent to each other through a cutting line, and the reserved part is arranged adjacent to the light incident surface; a light bar is provided, corresponding to Glossy setting; and remove the tearing part along the cutting line to leave the retaining part on the surface. The method for assembling the backlight module as described in item 1 of the patent application scope further includes assembling a frame on one side of the light bar and the light guide plate to fix the light bar and the light guide plate, and one end of the frame is pressed It fits in the reserved department. The method for assembling a backlight module as described in item 1 of the patent application scope, wherein the surface of the retaining portion has a plurality of optical particles to atomize light. A backlight module includes: a light guide plate having a surface and a light incident surface, and the surface and the light incident surface are vertically adjacent to each other, a reserved portion, the reserved portion is a diaphragm, and is attached to The surface is disposed adjacent to the light incident surface, wherein the retention portion is a portion of a protective film after a tearing portion is removed along a cutting line; and a light bar is disposed corresponding to the light incident surface to oppose the light guide plate Forming side-entry light; wherein, after the light guide plate and the light bar are assembled with each other, the retention portion is left on the surface to achieve the effect of eliminating hot spots. The backlight module as described in item 4 of the patent application scope further includes a frame, which is arranged on one side of the light bar and the light guide plate for fixing the light bar and the light guide plate, and one end of the frame is pressed It fits in the reserved department. The backlight module as described in item 4 of the patent application scope, wherein the surface of the reserved portion has a plurality of optical particles to atomize light. A method of manufacturing a light guide plate includes the following steps: providing a light guide plate; covering a surface of the light guide plate with a protective film; and forming at least one cutting line on the protective film through laser processing to adapt the protective film The cutting line has at least one retaining portion and at least one tearing portion, and the retaining portion and the tearing portion are adjacent to each other through the cutting line. The method for manufacturing a light guide plate as described in item 7 of the patent application scope, wherein the cutting line is composed of a complex sintering melting point formed by laser processing. The manufacturing method of the light guide plate as described in item 7 of the patent application scope, wherein after the laser processing forms the cutting line, the light guide plate is cut to the required size through the laser.