TWI356205B - Backlight module and application thereof - Google Patents

Description

1356205 IX. Description of the Invention: - Technical Field of the Invention The present invention relates to a backlight module and an application thereof, and particularly to a backlight module capable of changing a deflection of light in a light guide plate and a display thereof • The application on the device. [Prior Art] With the continuous innovation of the information and communication industry, the market for liquid crystal display (LCD) has been booming. The liquid crystal display is widely used in personal digital assistants because of its high quality, small size, light weight, low driving voltage and low power consumption (Pers〇nal).

Consumer communications or electronics such as Digital Assistants; PDAs, mobile phones, camcorders, notebook computers, desktop displays, car displays, and projection TVs. Coupled with the rapid advancement of integrated circuit (IC) industry and liquid crystal display manufacturing technology, these consumer communications or electronic products are also moving toward light, thin, short and small trends. Especially in the electric brain product, in addition to the high-performance, high-speed desktop computer, the portable notebook computer is greatly concerned and valued. Most of the liquid crystal displays that are common in the market are backlit LCD displays. The liquid crystal displays of the Ting class are mainly composed of a liquid crystal display panel at the front end and a backlight module at the back end. Therefore, the backlight module is one of the key components in the liquid crystal display. The backlight module can be divided into two types: edge lighting and Bottom Lighting according to the incident position of the light source. It is usually used in various information, communication and consumer products to provide the above liquid crystal. A surface light source for the display. 5 Referring to FIG. 1A, a schematic top view of an edge-lit backlight module according to the prior art is shown. The conventional edge-lit backlight module 9 is introduced into the lateral light source 912 through the light guide plate 911, and is reflected and refracted by optical films (not shown) of different optical purposes to form a uniform surface light source. Shoot out. However, when the side light source 912 of the edge-lit backlight module 91 is a plurality of point light sources (for example, Light Emitting Diodes (LEDs), there is light between the light sources. The illuminated area thus forms a plurality of triangular dark bands 913, which affect the backlighting effect and reduce the area of the display viewable area 901. Please refer to FIG. 1B, which is a partial side elevational view of another edge-lit backlight module according to the prior art. When the lateral light source 〇 of the backlight module 92 is, for example, a Cold Cathode Flu_cent Lamp (CCFL), since the light is incident on the light guide plate 921 at a specific angle, at least a certain distance d is required to emit light or Reflecting light also causes the area of the visible area to be limited. SUMMARY OF THE INVENTION Therefore, an aspect of the present invention is to provide a backlight module and an application thereof (by using (4) a light refraction zone to change the deflection of light to expand the illumination range of the light, thereby reducing the triangular darkness of the backlight module. In the case of banding, increase the area of the visible area. A further aspect of the present invention is to provide a backlight module and an application thereof for shortening the distance of light emission or reflection in a light guide plate, and expanding the area of the display visible area. Yet another aspect of the present month is to provide a backlight module and its application ' to achieve a different optical effect by concentrating the illumination range of light. According to an embodiment of the invention, the backlight module of the present invention comprises at least a light source and a light guide plate. The light guide plate is disposed on the ___ side of the light source, and the light guide plate at # includes at least a light exit surface, a light reflection surface, a light refraction area, and a light exit area. The light-emitting surface is formed on the front surface of the light guide plate, and the light-reflecting surface is opposite to the light-emitting surface. The light-refractive region is formed on the side of the light guide plate and close to the light source, and the light-emitting region is formed on one side of the light-refractive region, and is opposite to The light source is configured to guide the light to emit 'the refractive index of the light of the light refraction zone is different from the refractive index of the light exiting zone. Further, according to an embodiment of the present invention, the backlight module of the present invention can be applied to a liquid crystal display device. Therefore, the backlight module of the present invention can change the deflection of the light by the light refraction zone to achieve different optical effects, and can reduce the triangular dark band condition in the backlight module. Moreover, the distance at which light is emitted or reflected in the light guide plate can be shortened' to enlarge the area of the visible area. [Embodiment] FIG. 2 is a cross-sectional view showing a backlight module and a liquid crystal display module according to a first embodiment of the present invention. The backlight module 100 of the embodiment can be combined with a liquid crystal display module 2 〇〇 for use as an edge-lit backlight module of a liquid crystal display (LCD). The backlight module 1A includes a housing 11A, a light source 12A, a light guide plate 13A, a reflection plate 140, and an optical film group 150. The housing 11 is used to mount the light source 12A, the light guide plate 130, and the reflection plate 140. The light source 12 is disposed on one side of the housing 110 for laterally emitting light to the light guide plate 130, and is guided by the light guide plate 13 to emit light. The anti- 1356205' plate 140 is disposed below the light guide plate 130 for reflecting the light. Optical - The diaphragm group 150 is disposed above the light guide plate 130 for optical improvement of different purposes. As shown in Fig. 2, the casing 11 of the present embodiment has a light exit opening m and a chamber 112. The light exit opening ηι is used for light emission. In the embodiment, the shell and the body 110 can form a lampshade of a closed structure to prevent light from leaking out of the light exit opening 111, wherein the casing 11 is impervious. The light material is packaged as 'for example, a plasticized material, a metallic material, or a combination of the above. The cavity chamber 112 is formed on one side of the light guide plate 130 for accommodating the light source 120. The inner side wall 112a of the cavity 112 may be coated with a light reflective material such as gold, silver, aluminum or a combination of the above materials. The incident light that is not incident on the light guide plate 13A can be reflected back into the light guide plate 130. The light source 120 of the present embodiment is, for example, a Cold Cathode Fluorescent Lamp (CCFL) Hot Cathode Lamp (HCFL) or a Light Emitting Diode (LED). As shown in FIG. 2, please refer to FIG. 2 to FIG. 4, FIG. 3 is a partial top view of a backlight module according to a first embodiment of the present invention, and FIG. 4 is a schematic view of the backlight module according to the present invention. The backlight module of the first embodiment is a top view. The light guide plate 130 of the embodiment is disposed on the 'one side of the light source 12' to guide the light, and the light guide plate 130 is formed into a flat plate structure or a wedge plate structure by, for example, injection molding, and the material thereof is, for example, a poly Based on methyl acrylate (PMMA). The light guide plate 130 includes a light-emitting surface 131, a light-emitting surface 132, at least one light-refractive region 133, a light-emitting region 134, and a light-incident surface 135. The pupil surface m is recorded on the front surface of the light guide plate 13G, and corresponds to the light exit opening 111 of the housing ιι to emit light. The surface of the light-emitting surface 131 can be selected 8 1356205

Irradiation Fan®' to achieve no (four) optical effect D is wrong at the second figure. The light guide plate 130 of the present embodiment may be provided with a light guiding junction 'no' to the light reflection ® 132 1, by which the reflection is guided by the light source 12 The light emitted by the crucible can be emitted by the light exit surface 131, preferably in a forward direction (positive light output). The light guiding structure of the light guide plate 13A is, for example, a continuous v-shaped structure, that is, a V-Cut structure (for example, formed by injection molding or micro-cutting), and a matte structure (for example, using a blasting process) Forming, a scattering point structure (for example, formed by screen printing or integral molding), whereby light entering the light exiting region 134 from the light refraction zone 133 can be sufficiently emitted by the light exiting surface 131. It should be noted that the light-emitting surface 131 of the light guide plate 130 may also have a fog treatment or a scattering point design, so as to uniformize the light output of the light guide plate 13 to reduce the unevenness of light (MUra). Furthermore, when the light guide plate 130 is a wedge plate structure, the light guide plate 13 can be selected to have no light guiding structure, and the light reflecting surface 132 having a bevel angle is formed by the wedge plate structure of the light guide plate 130 to reflect the light. It is emitted from the light exit surface 131. As shown in FIG. 2, the reflecting plate 140 of the present embodiment preferably corresponds to the shape of the light reflecting surface 132, and is closely disposed below the light guiding plate 13〇 for making the light incident on the light reflecting surface 132. Form a total reflection. It is to be noted that the light reflecting surface 132 of the light guide plate 130 may also be coated with a material having high reflectivity, such as a metal material, to reflect incident light, thereby further replacing the reflecting plate 140. As shown in FIG. 2, the optical film group 150 of the present embodiment is, for example, a diffusion sheet, a prism sheet, a Turning Prism Sheet, and a bright film 1356205. The backlight amount can be applied to a large size. The backlight module is configured to change the incidence of light in the light exit region 134 by the light refraction region 133c. Referring to FIG. 7, a partial top view of a backlight module according to a fourth embodiment of the present invention is shown. Only the differences between the present embodiment and the first embodiment will be described below, and the similarities are not described herein again. Compared with the first embodiment, the light guide plate 130d of the fourth embodiment is provided with a plurality of light refraction regions 133d, and the light refractive indices of the light refraction regions 133d are different from each other' and different from the light refractive index of the light exit region 134.丨 丨 for example: Μ ' 1.2 and 1.3, by which the deflection of the light is gradually changed to enlarge or concentrate the illumination range of the light in the light exit region 134. According to the embodiment of the present invention, the backlight module of the present invention and the application thereof can change the deflection of the light (4) by the light refraction zone|to expand or concentrate the illumination range of the light in the light exiting area to achieve different optical effects. (for example, to reduce the triangle dark band situation). While the present invention has been described above by way of example only, it is not intended to limit the invention, and the invention may be practiced in various embodiments without departing from the spirit and scope of the invention. The scope is subject to the definition of the scope of the patent application attached. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; A schematic view of the backlight module. The first drawing is according to the prior art. Another type of edge-lit backlight module 12 1356205 200 : liquid crystal display module 901 : visible area 910 : backlight module 911 : light guide plate 912 : lateral light source 913 : dichroic dark band 920 : backlight module 921 : light guide plate 922 : lateral light source

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Claims (1)

X. Patent application scope: h A backlight module comprising: at least: a light source; and a light guide; &amp;&amp;&amp; is placed on the side of the light source, wherein the light guide plate comprises at least: a light exit surface formed on the light source a front surface of the light guide plate; a light reflecting surface opposite to the light emitting surface; at least one light fold (four) formed on one side of the light guide plate and adjacent to the light source; and = light exiting region formed in one of the light refraction regions The side is opposite to the light source 'for guiding the line emission, wherein the light refractive index of the light refraction zone is different from the light refractive index of the light exit zone. 2. The backlight module of claim 2, wherein the optical refractive index of the light refraction zone is (4) smaller than the refractive index of the light exiting region. 3. The backlight module of claim 1, wherein the refractive index of the photorefractive region is substantially less than i4. 4. The backlight module of claim 3, wherein the refractive index of the photorefractive region is substantially between 1.4 and 1. 5. The backlight module of claim 1, wherein the refractive index of the refractive region of the light 15 1356205 is substantially greater than the refractive index of the light exiting region. The backlight module of claim 5, wherein the light refractive index of the light-refractive region is substantially greater than 14. The backlight module of the invention, wherein the light guide plate to v comprises a plurality of light refraction zones, wherein the light refractive indices of the light refraction zones are different from each other and different from the light (four) light 8. The backlight module of claim 6, wherein the light refraction zone is formed on one side of the light guide plate by injection molding. The backlight module, wherein the light guide plate is in the form of a flat plate structure. The backlight module according to the scope of the patent application, wherein the light guide plate has a wedge-shaped plate structure. For example, the patent scope _丨The backlight module of the present invention, wherein the backlight module comprises at least two light sources and at least two light refraction zones, wherein the light source is disposed on two sides of the light guide plate, and the light refraction zones are respectively formed on The light guide plate is disposed on the two sides of the light guide plate, and is located between the light source and the light exiting area. The backlight module of claim 1, wherein the light guide plate further comprises: 16 ~ light entrance surface, Formed on the other side of the light refraction zone for The light-emitting surface can enter the light-refractive area by the light-incident surface. The backlight module of claim 12, wherein the light surface has a V-shaped structure (V_Cut), an S-shaped wave structure or The surface of the backlight module of the first aspect of the invention, which further comprises: a drum body for mounting the light source and the light guide plate. ± I5. The backlight module of claim 14, wherein the inner side wall of the casing is coated with a high reflectivity material to reflect light to emit light in the forward direction. _ I6. The backlight module according to claim 15 The same reflectance material is selected from the group consisting of gold, bismuth, and a combination of the above materials. 17. The backlight module of claim 14, wherein the material of the casing is selected A group of free plasticizing materials, metal materials, and any combination of the above materials, such as the backlight module of the above-mentioned sf patent item i, wherein a 17 1356205 reflector is disposed below the light guide plate. Used to reflect light. 19. The backlight module of claim 1, further comprising: an optical film set disposed above the light guide plate. 20. The backlight module of claim 19 Wherein the optical film set is selected from the group consisting of a diffusion sheet, a ruthenium sheet, a Turning Prism Sheet, a Brightness Enhancement Film (BEF), and a Reflective Brightness Enhancement Film (Dual Brightness Enhancement. Film; DBEF). A group of non-multilayered reflective polarizing polarizers (DRPF) and any combination of the above. 21. The backlight module of claim 1, wherein the light source is selected from a Cold Cathode Fluorescent Lamp (CCFL) Hot Cathode Fluorescent Lamp (HCFL) and a light emitting diode Light Emitting Diode (LED) is a group of people. The backlight module of claim 1, wherein the light guide plate further comprises: a plurality of light guiding structures formed on the light reflecting surface. 23. The backlight module of claim 22, wherein each of the light guiding structures has a V-shaped structure (V-Cut). The backlight module of claim 23, wherein the light guiding structures are formed by injection molding or micro-cutting. 25. The backlight module of claim 22, wherein the light guiding structures are in a matte structure. 26. The backlight module of claim 22, wherein the light guiding structures are in a scattering point structure. 27. The backlight module of claim 1, wherein the light reflecting surface has an atomization treatment or a scattering point design. The backlight module of claim 1, wherein the light reflecting surface is coated with a high reflectivity material to reflect light. 29. The backlight module according to claim 1, The illuminating surface is provided with a plurality of prismatic protruding structures. The backlight module of claim 1, wherein the illuminating surface is provided with a plurality of semi-circular protruding structures. The device comprises at least: a liquid crystal display module, and a backlight module mounted on the liquid crystal display module, wherein the back mode 1356205. The group comprises at least: - at least one light source; and a light guide plate The light guide plate is disposed at a side of the light source, wherein the light guide plate comprises at least: a light exit surface formed on a front surface of the light guide plate; a light reflection surface opposite to the light exit surface; and a less than one light refraction region formed on the light guide One side of the light plate is adjacent to the light source; and • a light exiting region 'formed on one side of the light refraction zone and for guiding light emission relative to the light source', wherein the light refractive index of the light refraction zone is Do not The liquid crystal display device of the light-emitting region, wherein the light refractive index of the light-refractive region is substantially smaller than the light refractive index of the light-emitting region. The liquid crystal display device of claim 31, wherein the light refractive index of the light-refractive region is substantially less than 1-4. The liquid crystal display device of claim 33, wherein the light is refracted. The light-refractive index of the region is substantially between 1.4 and 1. The liquid crystal display device of claim 31, wherein the light refractive index of the light-refractive region is substantially greater than the light refraction of the light-emitting region The liquid crystal display device according to the above aspect of the invention, wherein the light refractive index of the light-refractive region is substantially greater than 1.4. 37. The liquid crystal according to claim 31 a display device, wherein the light guide plate comprises at least a plurality of light refraction regions, wherein the light refractive indices of the light refraction regions are different from each other and different from the refractive index of the light exit region. Description The liquid crystal display device, wherein the light-refractive-aluminum is formed on the side of the light-guiding plate by the method of injection molding. The liquid crystal display device according to claim 31, wherein the light guide plate has a flat plate structure. The liquid crystal display device according to claim 31, wherein the light guide plate is in the form of a wedge plate. The liquid crystal display device according to claim 31, wherein the backlight module The group includes at least two light sources and at least two light-refractive regions, the light sources are respectively disposed on two sides of the light guide plate, and the light-refractive regions are respectively formed on two sides of the light guide plate, and the light source and the light-emitting layer are located Between the districts. The liquid crystal display device of claim 31, wherein the light guide plate further comprises: 21 1356205. A light incident surface is formed on the other side of the light refraction zone for illuminating the light source The light refraction zone can be accessed by the light incident surface. 43. The liquid crystal display device of claim 42, wherein the light incident surface has a V-shaped structure (ν-Cut) 'S-shaped wave structure or surface roughening treatment. 44. The liquid crystal display device of claim 31, wherein the φ further comprises: a broken body for mounting the light source and the light guide plate. 45. The liquid crystal display device of claim 44, wherein the inner side wall of the housing is coated with a high reflectivity material to reflect light in a forward direction. 46. The liquid crystal display device of claim 45, wherein the high reflectivity material is selected from the group consisting of gold, silver 'aluminum, and combinations of the foregoing. 47. The liquid crystal display device of claim 44, wherein the material of the a-body is selected from the group consisting of a plasticized material, a metal material, and any combination of the above materials. 48. * The liquid crystal display device of claim 3, wherein the liquid crystal display device further comprises: 22 1356205 a reflector disposed below the light guide plate for reflecting light. 49. The liquid crystal display device of claim 31, further comprising: an optical film set disposed above the light guide plate. 50. The liquid crystal display device of claim 49, wherein the optical film set is selected from the group consisting of a diffusion sheet, a ruthenium sheet, and a Turning Prism Sheet 'Brightness Enhancement Film (BEF). , a group of reflective brightness enhancing films (Dual Brightness Enhancement Films; DBEF), non-multilayer film reflective polarizers (DRPF), and any combination thereof. The liquid crystal display device of claim 31, wherein the light source is selected from a Cold Cathode Fluorescent Lamp (CCFL) Hot Cathode Fluorescent Lamp (HCFL) and a light emitting diode Light Emitting (Diode; LED) is a group of people. The liquid crystal display device of claim 31, wherein the light guide plate further comprises: a plurality of light guiding structures formed on the light reflecting surface. 53. The liquid crystal display device of claim 52, wherein each of the light guiding structures has a V-shaped structure (V-Cut). The liquid crystal display device of claim 53, wherein the light guiding structures are formed by injection molding or micro-cutting. The liquid crystal display device of claim 52, wherein the light guiding structures are in a matte structure. The liquid crystal display device of claim 52, wherein the light guiding structures are in a scattering point structure. The liquid crystal display device of claim 31, wherein the light reflecting surface has an atomization treatment or a scattering point design. 58. The liquid crystal display device of claim n, wherein the light reflecting surface is coated with a high reflectivity material to reflect light. The liquid crystal display device of claim 31, wherein the light exiting surface is provided with a plurality of prismatic protruding structures. The liquid crystal display device of claim 31, wherein the light-emitting surface is provided with a plurality of semi-circular protruding structures. 24 1356205 . September 20, 2011 Corrected replacement page There are also a plurality of large structures (not shown), such as prisms or semi-circles, to further correct the direction of the light to increase the concentrating effect. The light reflection © U2 is located on the bottom surface of the light guide plate 130 and is opposite to the light exit surface 131. Light refraction zone. It is formed on one side of the V-light plate 130 and is close to the light source 12A. The photo-refractive area 133 is formed, for example, by injection molding or filling. The light exiting region 134 is formed on the side of the light refraction zone 133 and is used to guide the light emission relative to the light source (10). The light incident surface 135 is formed on the other side of the light refraction area 133, and is adjacent to the light exit opening lu of the casing 11 for enabling the light source to enter the light refraction area 133 from the light incident surface 135. % may have, for example, a V-shaped structure (v_Cut), a 3-shaped wave structure, or a surface roughening process (not shown) to improve the incidence efficiency and optical coupling efficiency of light. The light refractive index ηι of the light exiting region 134 is different from the light refractive index 〜 of the light refracting region 133, whereby the direction in which the light is incident on the light exiting region 134 is deflected. As shown in FIG. 3 and FIG. 4, in the embodiment, the light source 12 is, for example, a plurality of point light sources (for example, light-emitting diodes) arranged on one side of the light guide plate 130, and generally the light source 120 is The light guide plate 13 has an air medium (that is, a refractive index of light 1), and the light refractive index of the light exit region 134 is, for example, 1.4. At this time, the light refractive index h of the light-refractive region 133 may be, for example, smaller than the light refractive index ηι of the light-emitting region 134, preferably substantially between 1 and 14 and close to 1 (for example, 1.1). When the light is incident on the light guide plate 130, the light can be further deflected laterally after entering the light exiting region 134, thereby expanding the illumination range of the light in the light exiting region 134, thereby reducing the triangular dark band between the light sources. 'It is worth noting that the area of the visible area is increased. The refractive index of the light-refractive area 133 can also be greater than the refractive index n of the light-emitting area 134, so that the concentrated light is in the light-emitting area 934. 9 1356205 September 20, 2011 Day Brightness Enhancement Film (BEF), Reflective Brightness Enhancement Film (DBEF), Diffused Reflective Polarizer Film (DRPF), or any combination thereof, etc. Above the light guide plate 130, the light emitted by the light guide plate ι3 can be further optically improved for different purposes. Therefore, when the backlight module 1 of the present embodiment provides a backlight, the light emitted by the light source 120 can change the incidence of light in the light exit region 134 by the light refraction region 133 of the light guide plate 13 The illumination range of the light in the light exiting area 134 can be enlarged, thereby reducing the triangular dark band 136 of the backlight module and increasing the area of the visible area. Referring to Figure 5, there is shown a partial cross-sectional view of a backlight module in accordance with a second embodiment of the present invention. Only the differences between the present embodiment and the first embodiment will be described below, and the similarities are not described herein again. Compared with the first embodiment, the light source 12 of the second embodiment is, for example, a cold cathode lamp. At this time, the light of the light source 120b can be further deflected longitudinally after entering the light exiting region 134, thereby shortening the light on the light guide plate 13 The distance from the mountain to the light or the reflection of the mountain 'is expanded to show the area of the visible area. Therefore, the light guide plate 130 can enlarge the visible area by the light refraction area 133. Referring to Figure 6, a partial cross-sectional view of a backlight module in accordance with a third embodiment of the present invention is shown. Only the differences between the present embodiment and the first embodiment will be described below, and the similarities are not described herein again. Compared with the first embodiment, the backlight module 100 of the third embodiment includes at least one light source 12〇C and two light-refractive regions 133c respectively disposed on the two sides of the light guide plate 13〇, and the light is refracted. The positive 133c can respectively guide the light into the light guide plate 130 from both sides of the light guide plate 130, thereby increasing the backlight module 1〇〇1356205. The side view of the replacement page is corrected on September 20, 2011. The figure shows a partial cross-sectional view of a backlight module and a liquid crystal display module in accordance with a first embodiment of the present invention. Fig. 3 is a partial top plan view showing a backlight module according to a first embodiment of the present invention. 4 is a top plan view showing a backlight module not according to the first embodiment of the present invention, showing a backlight module according to a second embodiment of the present invention. 5 is a partial cross-sectional view. FIG. 6 is a partial cross-sectional view showing a backlight module in accordance with a third embodiment of the present invention. Figure 7 is a partial top plan view showing a backlight module in accordance with a fourth embodiment of the present invention. [Description of main component symbols] d, mountain: distance 110: housing 112: chamber 131: light-emitting surface 134: light-emitting area 136: triangular dark band 150: optical enamel group (1), n2, n3, n4: refractive index 1背光: backlight module 111: light exit opening 112a: inner side wall 120, 120b, 120c: light source 130: light guide plate 132: light reflecting surface 133, 133c, 133d: light refraction area 135: light incident surface 140: reflecting plate 13