TW200408833A - Light guide plate and surface light source device using the same - Google Patents

Abstract

A surface light source device includes a light guide plate, a lamp and a lamp cover enclosing a part of the outer circumferential surface of the lamp. The light guide plate can direct light directly coming from the lamp and reflected by the lamp cover to output, and can enhance brightness and uniformity of outputting light. The light guide plate includes an incident surface, a light emitting surface crossing to the incident surface, a bottom surface being opposite to the light emitting surface. The bottom surface has a plurality of light diffusion recesses therein, wherein top surfaces of the light diffusion recesses form a specific curved face. The bottom surface further has a reflection film thereon.

Description

V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a surface light source system and a light guide plate and a lighting device with a relatively high light output. Especially, it is a [previous technology] surface light source system using a v-plate. Due to the liquid crystal display device and | < τ <, Feng. It is widely used in notebook computers, mobile phones and other "electrical advantages," because the liquid crystal itself does not emit modern information such as assistants to achieve display functions. Features' are required to provide a surface light source system ^ mouth surface light source system includes a light source and a light guide plate, the light incident surface setting, the light guide plate guides the light beam emitted from the light source U-line light source or point light source to the surface light source. The light guide plate ： Bottom 殁 = number of dots, which is used to destroy the total reflection of the light beam transmitted inside the light guide plate, and to diffuse it to improve the uniformity of the light beam emitted by the light guide plate, thereby improving the overall performance of the surface light source system. The density and size can be designed differently to adapt to different surface light source systems. For two kinds of practices, please refer to the US special spear published on September 3, 2002 ^ No. 6, 443, 583 (No. (Refer to a figure), the surface light source system 100 includes a lamp tube 110, a lamp cover 120 surrounding the lamp tube 110, and a light guide plate 200 whose one end is fixed to the lamp cover 120. The light guide plate 200 includes a light incident surface 201, the bottom surface 202 and the light emitting surface 203, wherein the lamp tube no is set relative to the light incident surface 001. During operation, the light beam from the lamp tube 110 and the lampshade 120 is transmitted to the wheel inside the light guide plate 200, and It is converted into a surface light source and emitted through the light-emitting surface 2.0. In order to increase the utilization ratio of the light beam, the surface light-source system 100 further includes a reflecting plate 21 0 disposed on the bottom surface 200-side of the light guide plate 200 to reflect from The bottom surface 202 emits 200408833 V. Description of the invention (2) ---- A diffuser plate 220, a first fascia plate 23, and a partial light beam are sequentially arranged on the side. And the surface light source system 100 is on the light guide plate 2. 〇The light-emitting surface 203 has another edge, a few, 1 / in ... into only 7-specification micro. 240, the diffuser 220 is used to enhance the uniformity of the light beam emitted from the light guide plate 200, a plate 230 and 240 functions as a light concentrator to enhance the brightness of the light guide plate 200. However, the surface light source system 100 needs to use two fascia plates 23 and 24 to gather the light beams emitted from the light guide plate 200 light emitting surface 203 to increase the brightness. , The use of a reflective plate 2 10 to improve the utilization rate of the beam, making its structure complex, high material costs and inconvenient assembly In addition, there are many optical interfaces in the surface light source system, and the light beam has to undergo multiple optical effects in the meantime, causing a large optical loss and affecting the brightness of the surface light source system. D In view of this, provide A light guide plate with higher brightness and a surface light source system with simple structure, low cost and convenient assembly are really necessary. [Content] Optical performance The purpose of the present invention is to provide a light guide plate with high light output and excellent brightness. Assembly Another object of the present invention is to provide a surface light source system with a simple structure, low cost, and excellent optical performance. The surface light source system of the present invention includes a light guide plate and at least one light source, and the light guide plate includes at least one light receiving plate. The incident surface, an exit surface that intersects the incident surface and guides the light beam to exit, and a bottom surface opposite to the exit surface, and the light source is disposed opposite the incident surface. A plurality of pits are distributed on the bottom surface, and the scattering surface of the pits forms a curved surface to collect the light beams scattered by the pits. The bottom mask has a reflective film to prevent the light beams from escaping from the bottom surface, thereby improving the light guide plate.

Page 7 200408833 V. Description of the invention (3) Brightness. Among them, the curved surface formed by the scattering surface of the plurality of pits may be a partially rounded surface or an arc surface. This reflective film is a multilayer thin film 'formed by alternating SiO2 and SiO2, and its reflectance in the visible light region is at least 98%. The pit may be cylindrical, spherical, truncated, rectangular, or cubic. The plurality of pits can be evenly distributed on the bottom surface, and the size and density can also gradually increase the force σ in a direction away from the incident surface. The light guide plate may be a flat plate-shaped or wedge-shaped light guide plate. The light source may be a linear light source or a point light source. The surface light source system may further include a diffuser plate and a diaphragm plate. ^ Compared with the conventional technology, the bottom surface of the light guide plate of the present invention has a plurality of recesses, and the scattering surface of the recesses constitutes a curved surface of a specific shape, which can converge the light beams scattered by the recesses. The utilization ratio of the light beam makes the light guide plate have a high brightness and a certain uniformity. The surface light source system of the present invention uses a combination of a light guide plate and a light source, without the need for an additional reflector, and it can be used without a fascia or only a fascia. Its structure is simple and early, its cost is low, and its energy loss is relatively low. small. [Embodiment] Please refer to the first figure, which is a first embodiment of a surface light source system according to the present invention. The surface light source system 10 includes a light guide plate 20 and two light sources 3. The light guide plate 20 includes two incidence surfaces 21, an emission surface 22 connected to the incidence surface 21, and a bottom surface 24 opposite to the emission surface. The light source 30 includes a lamp tube 31 and a reflecting cover 32 partially surrounding the lamp officer 31. The two light sources 30 are respectively disposed opposite to the two incident surfaces 21 of the light guide plate 20.

Page 8 200408833 V. Description of the invention (4) Please refer to the second and third figures together, and lay a plurality of pits 23. The plurality of pits 23 are the light pits 2 which use the light beam entering the incident surface 21 in the light guide plate 20 to enhance the light beams emitted from the light exit surface 22. The pits 3 are uniformly distributed on the bottom of the light guide plate 20 and are cylindrical and round. The spherical or rectangular surface 25 forms a curved surface, which is a part of the beam emitted by the cylindrical surface, which further enhances the exit surface 2 2 and the bottom surface 24 of which 20 has a reflective film (not labeled). T i 0 2 is a multilayer film formed alternately. The projection prevents the light beam from escaping from the bottom surface 24 of the light guide plate 20, and improves the overall optical reflectance of the light guide plate 20, the vapor deposition method, the electron beam evaporation method, and the visible light region. Compared with the conventional technology, since the derivative pit 23 of the present invention, and the scattering surface 25 of the pit 23, can converge the light beam scattered by the pit 23, and the utilization of the bottom beam is made, so that the light guide plate 2 〇 Out of the sentence. The surface light source of the present invention is a combination of 'there is no need to use an external reflector such as a reflection plate, and the external cost is low' and the energy loss of the light beam is small. Please refer to the fourth figure and the fifth figure together. In the second embodiment, the surface light source system includes a light guide plate 40 including an incident surface 41 and a light guide plate 20 to make the light beam spread to a full degree. And uniformity surface 24, which stands. The plurality of concaves are used to converge the brightness of the light beam and the light on the reflective film, thereby reducing energy. The reflection plating method and other methods have a bottom surface of 24 points to break the self-reflective conditions. The plurality of concave cubes can also be scattered by the pits 23 through the pits 2 3. The light guide plate is reflected by Si02 and the beam. The energy film of the light beam can be formed. It is distributed on the bottom surface 24 of the light plate 20 to form a curved surface with a specific shape. The surface 24 has a reflective film to improve the brightness. The components using the light guide plate 20 and the light source 30 have a simple structure and form the first light source 30 and a light guide plate 40 of the surface light source system of the present invention. Bottom surface where the incident surface 41 intersects

200408833 V. Description of the invention (5) 44, the light source 30 may be a linear light source (such as a cold cathode fluorescent tube) or a point light source (such as a light emitting diode), which is arranged opposite to the incident surface 41. The bottom surface 44 distributes a plurality of pits 43, and the scattering surface 45 of the pit 43 forms a curved surface, which is a part of a cylindrical surface for converging the light beam scattered by the pit 43. The size and density of the recesses 43 increase gradually in a direction away from the incident surface 41 to improve the uniformity of the light beams emitted from the light guide plate 40 and the surface light source system 11. The bottom surface 44 has a reflective film (not labeled), and the reflective film is a multi-layer thin film formed of Si 02 and Ti 02 alternately. Please refer to the sixth and seventh figures, which are the third embodiment of the surface light source system of the present invention. The surface light source system 12 includes a light source 30 and a light guide plate 60. The light guide plate 60 is a wedge-shaped light guide plate, which includes an incident surface 61 and a bottom surface 64 which is obliquely connected to the incident surface 61. The light source 30 is disposed opposite the incident surface 61. A plurality of pits 63 are distributed on the bottom surface 64. The plurality of dimples 63 are evenly distributed on the bottom surface of the light guide plate 60. They are cubic, cylindrical, circular truncated, spherical, or rectangular. The scattering surface 65 of the plurality of pits 63 forms a curved surface, which is a part of a cylindrical surface for collecting the light scattered by the pits 63, and further, the brightness of the light beam emitted from the strong light guide plate 60. The bottom surface of the light guide plate 60 has a reflective film (not labeled) to prevent the light beam from escaping from the bottom surface M of the light guide plate 60, thereby reducing the energy loss of the light beam, and improving the overall optics of the light guide plate 60. Please refer to Figure 8 'It is the surface light source system of the present invention. The source system U includes a light source 30 and a light guide plate 60. In order to enter two = the uniformity of the brightness of the light beam emitted from the source system 13 is provided on the light guide plate. 1Further convergence of scattering through diffuser plate 80

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V. Description of the invention (6) The light beam of (6) can improve the light output brightness of the surface light source system 13, and a fascia plate 90 can be set on the other side of the diffuser plate 80 and the side adjacent to the exit surface 62. Please refer to the ninth figure ', which is another embodiment of the light guide plate of the present invention. The structure of the light guide plate 50 is substantially the same as that of the light guide plate 20 shown in the second figure, and it includes a bottom surface 54 which distributes a plurality of recesses 53. The plurality of pits 53 are distributed on the bottom surface 5 4 ′ of the light guide plate 50, which is rectangular or cylindrical, circular table, sphere or cube. The scattering surface of the plurality of pits 5 3 5 5 constitutes a curved surface, which is an arc surface, for converging the light beams scattered by the pits 5 3 to further enhance the brightness of the light beam emitted from the light guide plate 50. The bottom surface 54 of the light guide plate 50 has a reflective film (not labeled) In order to prevent the light beam from escaping from the bottom surface 54 of the light guide plate 50, thereby reducing the energy loss of the light beam and improving the overall optical performance of the light guide plate 50. As mentioned above, the present invention has indeed met the requirements of the invention patent, and a patent has been filed according to law Please "only the above two are only preferred embodiments of the present invention. For example, those who are familiar with the technology of this case, and any modifications or changes made in accordance with the spirit of this invention should be included in the scope of patent application below" '

200408833 The diagram briefly illustrates the first picture of the conventional technique. The surface light source is the second picture of the surface light source system of the present invention. The second picture is the surface light source shown in the second picture. The fourth picture is the fifth picture system of the surface light source of the present invention. The sixth figure of the surface light source shown in the fourth figure is the surface light source system of the present invention. The seventh figure is the eighth figure of the surface light source shown in the sixth figure. The ninth figure of the surface light source system of the present invention is a light guide plate of the present invention. ] Area light source system 10 11 12 Light guide plate 20 40 Λ 50 Light source 30 Reflector cover 32 Emitting surface 22 62 Recess 23 23 53 Bottom surface '24, 44 54 Scattering surface 25, 45 Λ 55 Diffusion plate 80 Sectional view. A perspective view of the first embodiment. Sectional view of the system. A perspective view of the second embodiment. Sectional view of the system. A perspective view of the third embodiment. Sectional view of the system. Cross-sectional view of the fourth embodiment. > 13 ^ 60 lamp 31 incident surface 21, 41, 61, 63 ... > 64 ^ 65 cymbal 90

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Claims (1)

200408833 VI. Scope of patent application 1 · A light guide plate comprising: at least one incident surface for receiving a light beam; an exit surface that intersects the incident surface for guiding the light beam to exit; a bottom surface opposite to the exit surface; Wherein, a plurality of pits are distributed on the bottom surface, and the scattering surface of the plurality of pits forms a curved surface to collect the light beams scattered by the pits. The bottom surface has a reflective film to prevent the earth beam from escaping from the bottom surface. 2. The light guide plate as described in item 1 of the scope of patent application, wherein the curved surface formed by the scattering surface of the recess is a partial cylindrical surface. 3. The light guide plate according to item 丨 in the scope of the patent application, wherein the curved surface formed by the scattering surface of the recess is an arc surface. 4 · The light guide plate according to item 1 of the scope of patent application, wherein the recess can be cylindrical, spherical, circular truncated, rectangular, or cubic. 5. The light guide plate according to item 1 of the scope of the patent application, wherein the plurality of pits are evenly distributed on the bottom surface. 6 · The light guide plate according to item 1 of the scope of the patent application, wherein the plurality of recesses, the size and density of the pits gradually increase in a direction away from the incident surface. 7. The light guide plate according to item 1 of the scope of patent application / wherein the reflective film is a multilayer thin film formed by alternately Si02 and Ti02. 8. The T-light plate according to item 1 of the scope of patent application, wherein the reflectance of the reflective film in the visible light region is at least 98%. 9. The light guide plate according to item 丨 in the scope of patent application, wherein the light guide plate is a flat plate-shaped or wedge-shaped light guide plate. 1 〇 · — Seed surface light source system, which includes: 200408833 6. Scope of patent application "At least one light source for emitting light beams; a light guide plate including ... at least one incident surface for receiving light beams; an exit surface that intersects the incident surface is for guiding light and a bottom surface, It is opposite to the exit surface. Among them, the bottom surface is distributed with a plurality of pits, and the plurality of pits form a curved surface for converging the surface scattered by the pits with a reflective film to prevent the light beam from being set from the bottom surface to the incident surface. 11 · The curved surface formed by the scattering surface of the pit of the surface light source system as described in item 10 of the scope of the patent application is a cylindrical surface. 1 2 · The scattering surface of the pit of the surface light source system as described in the scope of the patent application The curved surface formed is a circular arc surface. 1 3 · The surface light source system pit as described in the scope of the patent application item No. 丨 can be. Cylindrical, spherical, round table, rectangular or 1 4 · If applied / patent scope The surface light source system / number of pits described in item 丨 〇 are evenly distributed on the bottom surface. 1 5 · The size and density of the number of pits of the surface light source system described in item 丨 0 in the scope of patent application are far from the incident surface. Fangjia. 1 6 · The surface light source system film described in item No. 丨 0 of the patent application is a multilayer thin film formed by Si02 and Ti〇2 alternately, as described in the patent application. In the visible light rate, Shao Gang. Beam exit; the scattering surface of the pit, the bottom, the light source, the concave, the concave, which is the concave cube., Where the complex, where the complex direction gradually increases, where the Conversely, in which the reverse 200408833 6. Application for patent scope 1 8. The surface light source system as described in item 10 of the scope of patent application, wherein the light guide plate is a flat plate shape or a wedge-shaped light guide plate. The surface light source system according to item 10, wherein the light source may be a linear light source or a point light source. 2 The surface light source system according to item 10 of the patent application scope, further comprising a light source plate located on one side of the light guide plate exit surface. A diffusion plate and a prism plate. Page 15