TWI221210B - Backlight modular, light guide panel and a method for manufacturing thereof - Google Patents

Abstract

A backlight modular, including a light guide panel, a prism sheet and a diffuser. There are a plurality of diffusion granules distributed in the light guide panel. The light guide panel has a first surface and a second surface opposite to the first surface. The prism sheet is set on the first surface of the light guide panel, and the diffuser is set on the prism sheet. Furthermore, this invention also discloses a light guide panel used in the backlight modular and a method for manufacturing the light guide panel.

Description

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Light guide plate and manufacturing method thereof. The present invention relates to a backlight module and a light guide plate. [Technical Field] The present invention relates to a backlight module, and more particularly to a backlight module having high brightness, low brightness, and manufacturing method thereof. (B), [Previous Technology] With the advent of the digital age, the quality of TV images is increasingly being marketed. Translation: ‘and the entire display development trend is towards large size, high resolution: type. Due to the determination of the above trends, TFT-LCD and PDP are getting more and more, and the cost is still higher. However, the price of pDp is still higher than the market acceptable range, which makes TFT-LCD computer screens and TVs gradually replace traditional CRT curtain and TV. TFT-LCD is a non-self-luminous display, so it needs to be provided by the outside world and its required light source. At present, all TFT_LCD displays with self-luminous characteristics are provided with backlight modules to provide the light sources required by the display. The architecture of a traditional backlight module is shown in Figure 1. Fig. 1 shows a backlight module for large-scale display devices] It is composed of a reflective film 16, a cold-cathode lamp tube 15, a light guide plate 14, a first diffusion film n, a second diffuser film 13 and a diaphragm film 12. . Among them, the first diffusion film 11 is placed before the prism film 12; the diaphragm film 12 is placed before the second diffusion film 13 and the second diffusion film 13 is placed before the light guide plate 14. Currently, the backlight module 1 can be divided into two types: a direct type and an edge type according to the light source providing method. The direct type is to place the cold cathode lamp tube 15 directly below the light guide plate 14, and mainly provide the light source required for the backlight module 1 in a penetrating manner. In the edge-light type, the cold-cathode lamp tube 15 is placed on the side of the wedge-shaped light guide plate 14, and the required light source is mainly provided in a reflective manner. The above two kinds of back

Page 6 1221210 Case No. 92101591 Date of the Invention ⑵ _ Most light modules 1 need a light guide plate 14 to make the light distribution uniform. Generally speaking, the light guide plate 14 can be classified into a printed type and a non-printed type according to a processing method. The printing type is mainly the light guide plate 4 produced by the injection or extrusion process, and then the reflective dots are printed on the light guide plate 4 by screen printing. The non-printed light guide plate 14 is generally made in a wedge-shaped light guide plate 14 or a microstructure is directly injected on the surface of the light guide plate 14 by injection. With the evolution of the trend, large-sized desktop monitors and home televisions gradually replace small-sized products. Take computer screens as an example. The traditional 15 „, 17” CRT screens have slowly disappeared from the market and replaced by ” , LCD screens above 17, On the other hand, with the popularity of the fifth rTFT_lcd process, LCD screens on α will soon become the mainstream of the market. So it seems that 'large-sized light guide plates must also follow the LCD screen size From the perspective of the increase of the second force, the technology is limited to the number of pressure holding nozzles of the mold. It seems that the large-sized light guide plate can only be used to squeeze out the characteristics of the backlight module. How to make the same or "quality" in a cheaper way: "J [Group: How to improve the yield of its production are the focus of current mass production technology. (3) SUMMARY OF THE INVENTION In view of the above problems, the purpose of the present invention is to provide a functional light guide plate and a method for manufacturing the same. 'It is the edge supply-the tool is expanded first. Another object of the present invention is to provide a registered optical module. Promote a kind of back that uses only one diffusion film

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A plurality of high-concentration present inventions are characterized by diffusing particles in a light guide plate. However, another feature of the present invention is that the backlight module uses only one screen diffusion film: and a plurality of high-concentration diffusion particles are distributed in the light guide plate of the backlight module. In order to achieve the above purpose, the present invention provides a guide The light plate includes a light-guiding substrate and a plurality of diffusion particles. The diffusion particles are distributed in the light-guiding plate. In addition, the present invention also provides a method for manufacturing a light guide plate, the steps include: mixing a light guide substrate with a plurality of diffusion particles; melting the light guide substrate and the diffusion particles into a melt; and melting the melt物 形。 Shaped. In addition, the present invention further provides a backlight module, whose structure sequentially includes a diffusion film, a diaphragm film, a light guide plate, a cold cathode lamp, a reflection film, and a module frame. The diffusion film is disposed on the Before the diaphragm, the diaphragm is placed in front of the light guide plate. In the direct type, the light guide plate is placed before the cold cathode lamp, and the cold cathode lamp is placed in front of the reflective film; in the side light type, the light guide plate is placed before the reflective film The cold cathode lamp is placed on one side of the light guide plate. The module frame assembles and fixes the entire backlight module with the reflective film facing the opening surface. As mentioned above, since the light guide plate according to the present invention contains high-concentration diffusing particles, a brightening effect can be achieved. The backlight module according to the present invention uses a high-brightness light guide plate with a diffusion effect, so only a layer of diffusion film can be used to achieve the desired diffusion effect, and the use of only one layer of diffusion film increases the amount of light penetration. And reduce the complexity of assembling the backlight module, so it can achieve the effects of increasing brightness, reducing costs, and improving assembly yield.

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(4) [Embodiment] The following will describe a light guide plate, a backlight module and a manufacturing method thereof according to a preferred embodiment of the present invention with reference to related drawings. As shown in FIG. 2, the light guide plate of the preferred embodiment of the present invention is composed of a light guide substrate 241 and a plurality of diffusion particles 242. In this embodiment, the light guide substrate 241 may be made of optical acrylic or PC substrate. The diffusion particles 242 can be made of various organic and inorganic materials such as silicon dioxide, titanium dioxide, acrylic, polystyrene, silicone, epoxy resin, or polyurethane, or particles of two or more of these materials. Structure, the particle size is between 5 // ιη and 15 # m, and the ratio in the light guide plate 24 is between 0.5% ~, and the ratio is based on the refractive index between the diffusion particles 242 and the light guide substrate 241 and The shape and size of the diffusion particles 2 4 2 are related. Furthermore, the manufacturing process of the light guide plate 24 according to the preferred embodiment of the present invention is shown in steps 3 and 303 in FIG. 3. In this embodiment, the light guide substrate 241 is made of optical acrylic. The manufacturing method of the light guide plate is as follows: In step 301, quantitative mixing of materials is performed, which is first provided and mixed, and the scattered particles 242 and the light guide substrate 241 are provided. The concentration of the diffusion particles 242 in the total mixture is 0.1% to 20%. The ratio of the diffusion particles 242 to the light guide substrate 241 is related to the refractive index between the diffusion particles 242 and the light guide substrate 241 and the shape and size of the diffusion particles 242. The diffusion particles 242 can be made of various organic and inorganic materials such as dioxin, titanium dioxide, acrylic, polystyrene, silicone, epoxy resin, or polyurethane, or particles of two or more of these materials. Composition, its size ranges from 5 V m to 1 5 m, and presents a sphere

1221210 f 92101521 V. Description of the invention (5) Shape, hollow sphere, irregular opening E ^ ^ ^ Α # 9 / | 1 ^ ^, long bar, triangular pyramid, cube or code shape. The light-guiding substrate 241 is a rabbit's palace, and it is a procedure performed in the correction step 302 composed of S acrylic particles or PC substrates. The procedure is as follows: α ^ > ^ Α, .9 / 11 σ ^ The mixture of the diffusion particles 242 and the light-guiding substrate 2 41 is sent to A # r ^ κ 0 η and dried in a dry barrel at 80 to 130 ° C. It is exported on a small day and afterwards and sent to The material tube of the extruder is then melted and kneaded with a screw having a temperature of 240 to 300 ° C. _Step 303 is a molding process. The molten material is quantitatively stabilized by a gear pump, extruded into a flat plate with a τ die, and then cooled by a 6 0 2 0 C cooling roller. It was flattened into a continuous flat plate, and then subjected to a visual inspection film-laminating procedure, and cut into a size of 1 380 mm X 1 100 mm. After that, it is cut into 17 or other required sizes as required, and the cut panel is polished, printed, and ink dried to form a light guide plate 24. Hereinafter, a backlight module according to a preferred embodiment of the present invention will be described with reference to FIG. 4. Since the light guide plate used in this embodiment is the aforementioned light guide plate, it will not be described in detail here. As shown in FIG. 4, the composition of the backlight module 2 according to the preferred embodiment of the present invention includes a light guide plate 24, a reflective film 26, a cold cathode lamp tube 25, a diaphragm 22, a module frame 27 and A diffusion film 21. The diffusion film 21 is placed before the prism film 22 and the diaphragm film 22 is placed before the light guide plate 23. In the direct type, the light guide plate 23 is placed before the cold cathode lamp tube 25, the cold cathode lamp tube 25 is placed before the reflective film 26, and the module frame 27 is formed with the reflective film 26 facing the opening surface as Assemble and fix the entire backlight module in the side-light type, with the light guide plate 24 placed in front of the reflective film 26

10 Page 10 1221210 __Case No. 92101521_ Amendment of Year V. Description of the invention (6) The cold cathode tube 2 5 is placed on one side of the light guide plate 2 4 and the module frame 2 7 is a reflective film 2 6 is assembled toward the opening surface, and the entire backlight module 2 is fixed. After testing, it was found that the uniformity of the 5 points and 13 points of the backlight module 2 of the preferred embodiment of the present invention are within 75% and 85% of the specification, and it is found that the 5-point average brightness is reduced by reducing a diffusion film 21 Improve 3 ~ 7%. The above description is exemplary only, and not intended to be limiting. The spirit and scope of the invention should be included in the scope of the attached patent application. > 1221210 _Case No. 92101521_ Year, Month, and Revision _ Any Simple Changes or Modifications (5), [Simple Illustrations] Figure 1 is an exploded view of a conventional backlight module. FIG. 2 is a side view of a light guide plate according to a preferred embodiment of the present invention. FIG. 3 is a flowchart of a method for manufacturing a light guide plate according to a preferred embodiment of the present invention. FIG. 4 is an exploded view of a backlight module according to a preferred embodiment of the present invention. Component symbol description: I: Traditional backlight module

II: first diffusion film 1 2: diaphragm film 1 3 ·. Second diffusion film 1 4: light guide plate 1 5: cold cathode lamp tube 16: reflective film 1 7: module frame 2: backlight module 2 1 : Diffusion film

2 2 稜鏡 film 24: light guide plate 241: light guide substrate 242: diffused particles 2 5: cold cathode lamp tube 2 6: reflective film

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Claims (1)

1221210 MM 92101 ^ 9 ^ Sixth, the scope of the patent application J_day correction, a light guide plate, which includes ... and a light substrate 'which is selected from optical acrylic, and the multiple diffusion particles with at least the substrate, The distribution of the diffusion particle system The diffusion particle system is selected from the group consisting of: L: 'two' in the light-guiding substrate ', acetophenone, Shizhangba oxygen oxide, titanium oxide, acrylic, poly-one, The $ | ^^ epoxy resin and polyurethane are at least one of them, and the particle size of the net expanded particles is between 5 mm and 15 mm. Particle V: a light guide plate that is not described in the application ... the diffusion particles, such as the light guide plate described in item i of the patent application range, wherein the proportion of the diffusion particles in the light guide substrate is 〇 · 5 ~ 5%. 5. A method for manufacturing a light guide plate, comprising: mixing a light guide substrate with a plurality of diffusion particles, wherein the light guide substrate is at least one selected from the group consisting of optical acrylic and PC substrate, and The iso-diffusive particles are at least one selected from the group consisting of silicon dioxide, titania, acrylic, polystyrene, silicone, epoxy resin, and urethane. The particle size of the diffusion particles is between 5 // m to 1 5 // m; melting the light-guiding substrate and the diffusion particles into a melt; and Page 14 A ^ 121〇 Retouching t No. 92101521 6. Apply for a patent to shape the molten material 6. The method for manufacturing a light guide plate as described in item 5 in the eaves masonry as described in the patent application scope, where the temple The particle appearance of the expanded particles is spherical. Shi Shen called the light guide plate manufacturing method described in item 5 of the patent scope, wherein the ratio of the particles to the light guide substrate is 0.5 to 5 ° / 〇. Λ The method of manufacturing a light guide plate as described in item 5 of the patent application, wherein the diffusion particles and the light guide substrate are melted by screw heating. 10. The method for manufacturing a light guide plate as described in item 5 of the scope of patent application, wherein the smelt is shaped by a T-die extrusion method. 11. A backlight module comprising: a light guide plate having a first surface and a second surface parallel to the first surface, a plurality of diffusion particles are distributed in the light guide plate; a diaphragm It is disposed on the first surface of the light guide plate; and a diffusion film is disposed on the diaphragm. 1 2. The backlight module described in item 11 of the scope of patent application, further comprising: 1221210 --- case tfe 921m R9 | _year month date __ six, patent application scope-a cold cathode lamp 'which is adjacent to the second surface of the light guide plate; and a reflective film' which is provided One side of the cold cathode lamp tube parallel to the adjacent surface of the light guide plate. 1 3. The backlight module according to item 丨 2 of the patent application scope further includes a module frame, which has an opening portion, a bottom opposite to the opening portion, and a receiving space. The light guide plate The tritium film, the diffusion film, the cold cathode lamp tube and the reflective film are placed in the accommodating space, and the reflective film is adjacent to the bottom. 14. The backlight module according to item 11 of the scope of patent application, further comprising: a cold-cathode lamp tube disposed on the light guide plate perpendicular to one side of the first surface; and a reflective film, which It is arranged on the second surface of the light guide plate. 15. The backlight module according to item 14 of the scope of patent application, further comprising: a module frame 'which has an opening portion, a bottom opposite to the opening portion, and a receiving space' the light guide plate, The diaphragm, the diffusion film, the cold cathode lamp tube, and the reflection film are disposed in the accommodation space, and the reflection film is disposed adjacent to the bottom. Page 16