TWI274919B - Backlight system and method of making the same - Google Patents

Abstract

An integrated backlight system includes a frame, a light guide plate, and at least a light source. The frame includes a concave structure and at least a space, the light source is located in the space, wherein using Insert Molding that the light guide plate is located in the concave structure, the light guide plate and the frame are integrated structure.

Description

1274919 V. Technical Description of the Invention The present invention relates to a backlight module and a method of fabricating the same, and more particularly to an integrated backlight module for a liquid crystal display device and a method of fabricating the same. [Prior Art] Due to its advantages of lightness, thinness, and low power consumption, the liquid crystal display device is widely used in modern information equipment such as notebook computers, mobile phones, and personal digital assistants. However, since the liquid crystal itself does not have a light-emitting property, it is required to provide a backlight module to realize display. Please refer to the first figure, which is a structural diagram of a backlight module of the prior art. The backlight module 1 includes a light guide plate 4, a light source 5, a light source cover 6, a reflection sheet 7, and a frame 8. The light guide plate 4 mainly includes two opposite sides. a light incident surface, a light exit surface 4B, a bottom surface 4C, and a plurality of side surfaces (not shown). The bottom surface 4C is provided with a plurality of dots 9 which act to guide the light emitted from the light source 5 from the light exit surface 4 B. At the same time, the luminance of the liquid crystal panel (not shown) and the uniformity of the luminance thereof are improved; the light source 5 is disposed opposite to the light incident surface 4A of the light guide plate 4 and emits light to the light guide plate 4, and the light source 5 can be cooled by the cold cathode. a lamp (Cold Cathode Fluorescence Lamp, CCFL), a light-emitting diode (LED) or an electroluminescent lamp (EL); the reflection sheet 7 is disposed on the bottom surface 4 C of the light guide plate 4 and the frame 8 The function is to reflect the light from the bottom surface 4 C of the light source 5 or the guiding plate 4 to enhance the luminance of the backlight module 1; the frame 8 is generally a polymer resin material, and its main function is a protective guide. Components such as light plate 4, reflection sheet 7, and light source 5The backlight module 1 is composed of a light guide plate 4, a light source 5, a light source cover 6, and a reflection sheet.

1274919 V. INSTRUCTIONS (2) 7 and frame 8 are assembled and assembled, as in U.S. Patent No. 6,1,63,3,5,6, 5, 2, 945, 6, 5, 3, 943 The backlight modules disclosed in No. 6, No. 6, No. 626 and No. 6, 5 9 3, 98 0 are assembled by components such as a light guide plate, a light source, a light source cover, a reflection sheet, and a frame. However, the assembled backlight module is mainly manually assembled, and the assembly process is complicated, so labor and labor costs are required, and manual operation has instability and proficiency difference, so that each assembly component needs to be larger. There is a gap between the components after the tolerance L is installed, which causes light leakage, which causes the brightness of the liquid crystal panel to be low, which affects the product yield. Although the actual mechanical automation and other means instead of manual operation to reduce the reserved tolerance, it has not completely solved the problem of low brightness of the liquid crystal panel caused by light leakage. In view of this, it is necessary to provide a backlight module having a simple structure, high luminance, and low cost. SUMMARY OF THE INVENTION An object of the present invention is to provide a backlight module having a simple structure, high luminance, and low cost, and a method of manufacturing the same. Another object of the present invention is to provide a method of manufacturing a backlight module which has a simple structure, a high luminance, and a low cost. The backlight module of the present invention comprises a frame body, a light guide plate and at least one light source, the frame body has an open upward concave area, at least one cavity connected to the concave area, the light source is disposed on the a cavity, wherein the light guide plate is disposed in the concave region by a burying and injection molding technique, so that the light guide plate and the frame form an integrated structure.

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The backlight module provided by the present invention is provided with a light guide plate, and the light guide plate is injected into the mold to solidify the frame body integrated structure and make the cavity with the light guide plate; and the cavity of the frame body and the light guide plate frame is taken out. Forming a backlight manufacturing method, comprising the steps of: feeding into a mold; melting the frame material to form at least one space on the frame opposite to the light guide plate; and positioning at least one light source The module. Another backlight module provided by the present invention comprises: a base comprising a base and a side wall opposite to the ten Ja; a body disposed on the base 'the light transmission body has at least a side surface; at least - disposed on the An illuminator between the bottom wall and the side of the light transmitting body; wherein the base plate of the base plate forms an integrated structure by a burying and forming technique. One

Compared with the prior art, the backlight module of the present invention has the advantages that the frame body and the light guide plate are integrated into the molded structure, so that there is no gap between the components, and the light leakage phenomenon can be effectively reduced or eliminated. The panel brightness is improved; the frame is made of high reflectivity material, so there is no need to use the reflection sheet and the light source cover, and the structure is simple and the cost is reduced. [Embodiment] Referring to the second and third figures, a backlight module of the present invention includes a light guide plate 21, a frame 2^, and a plurality of light sources 23. The frame 22 has a box shape, and includes a lower surface 221, a plurality of side surfaces 222 intersecting the lower surface 221, and an upper surface 223 opposite to the lower surface 221. The upper surface 223 is not provided with an open concave area. 224 and a plurality of cavities 22 5 connected to the concave region 224. The material of the frame 22 is a highly reflective polycarbonate (PC) material, and the reflectivity is greater than 95%, such as

Page 6 1274919 V. Description of invention (4)

The light guide plate 21 is disposed in the concave region 224 and forms an integrated structure with the frame 22, and includes a light incident surface 211 and a light adjacent to the light incident surface 211. An exit surface 212, a bottom surface 2 1 3 opposite to the light exit surface, and a plurality of side surfaces 2 1 4, a bottom surface 213 of the light guide plate 21 is provided with a plurality of light diffusion dot arrays 215; and the light source 23 is a light emitting diode (Light-Emitting) Diode (LED) is disposed in the cavity 225 and opposite to the light incident surface 211 of the light guide plate 21. The light guide 2J and the frame 22 are formed into an integrated structure by an insert Molding technique. Please refer to the fourth figure together for the manufacturing method of the backlight module of the present invention. First, a light guide plate 21 is formed by using an injection molding process, and includes a light incident surface 211, a light exit surface 212, a bottom surface 213, and a plurality of side surfaces 214. The bottom surface 21 is provided with a plurality of light diffusion dot arrays 2丨5 (step 丨〇丨); the light guide plate 21 is placed into a mold by an arm, the mold comprises a female mold / a male mold matched with the female mold and a mold between the male mold and the female mold, the cardamom The mold core has a plurality of convex patterns, and the convex pattern is a semicircular ς == thick burn/wide °. The convex height is consistent with the difference between the light guide plate and the first incident surface 211, and is placed in the light guide plate 21 when Into the light, 211 is in contact with the planar portion of the semi-cylindrical body, and the PC material is melted and reflected toward the mold f, and the Pc material is solidified into a frame, and the frame light guide plate 21 forms an integrated structure (step 1〇2). A plurality of cavities 225 are formed in the side-to-side, and light is placed in the cavity 225: the 背光 phase backlight module 2 (step 1 〇 3). Original 23' formation

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Page 8 1274919 Brief description of the schema [Simplified schematic diagram] The first diagram is a schematic diagram of the structure of a backlight module of the prior art. The second figure is a perspective view of the backlight module of the present invention. The third figure is a schematic cross-sectional view of the backlight module of the present invention along the I I I - I I I line. The fourth figure is a flow chart of the manufacturing method of the backlight module of the present invention. [Main component symbol description]

Backlight module 2 Frame 22 Lower surface ___ 221 Side surface 222 Upper surface 223 Concave area: 224 Cavity 225 Light guide plate 21 Light incident surface 211 Light exit surface 212 Bottom surface 213 Side 214 Light diffusion dot array 215 Light source 23

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Claims (1)

1274919 VI. Patent application scope 1 · A backlight module comprising: a frame body, a light guide plate and at least one light source, the frame body having an open upward concave area, at least one cavity connected to the concave area, The light source is disposed in the cavity, wherein the light guide plate is disposed in the concave region by using a buried incidence molding technique, so that the light guide plate and the frame form an integrated structure. The backlight module of claim 1, wherein the material of the frame is a high reflectivity material. 3 · If you apply for the backlight module described in item 1, the light guide plate A light diffusion dot array is disposed on the bottom surface. 4. The backlight module of claim 1, wherein the light source is a light emitting diode. The backlight module of claim 1, wherein the light guide plate material is acrylic resin, polycarbonate, polyethylene resin or transparent glass. 6) A method for manufacturing a backlight module, comprising the steps of: k for a 'light guide plate' to place the light guide plate into a device; Injecting the molten frame material into the mold, curing the frame material, forming an integrated structure between the frame and the light guide plate, and forming at least one cavity on the frame opposite to the light guide plate; taking out the frame and the guide a light panel; and at least one light source is disposed in the cavity of the frame to form a backlight module. 7. The method of manufacturing a backlight module according to claim 6, wherein the material of the frame is a high reflectivity material. The invention relates to a method for manufacturing a backlight module according to the sixth aspect of the invention, wherein a light diffusion dot array is arranged on a bottom surface of the light guide plate. 9. The method of manufacturing a backlight module according to claim 6, wherein the light source is a light emitting diode. 10. The method of manufacturing a backlight module according to claim 6, wherein the light guide plate material is acrylic resin, polycarbonate, polyethylene resin or transparent glass. 11 · A backlight-mode J and comprising: a base comprising a base and two opposite side walls; a light transmitting body disposed on the base, the light transmitting body having at least one side; at least one disposed between a side wall of the base and a side of the light transmitting body The illuminant; wherein the pedestal and the optical transmission body form an integrated structure by a buried incident molding technique. The backlight module of claim 2, wherein the material of the base is a high reflectivity material. The backlight module of claim 3, wherein the bottom surface of the light transmitting body is provided with an array of light diffusion dots. The backlight module of claim 11, wherein the illuminant is a light emitting diode. The backlight module of claim 11, wherein the light transmitting material is acrylic resin, polycarbonate, polyethylene resin or transparent glass. Page 11