200409972 五、發明說明（1) 【發明所屬之技術領域】 ^本發明係關於一種導光板及採用該導光板之面光源系 ，，尤指一種出光輝度較高、出光均勻之導光板及採用該 導光板之面光源系統。 【先前技術】 ，於液晶顯示裝置具輕、薄、耗電小等優點，廣泛應 用於筆。己本電、行動電話、個人數位助理等現代化資訊 σ又備。因液晶本身不具發光特性，需為其提供面光源系統 以貫現顯示功能。 1知面光源系統包括光源及導光板，光源係相對導光 板之入光面設置，該導光板引導自光源發出光束之傳輸方 ^ ’將線光源或點光源轉化為面光源出射。該導光板底面 :佈複數網點’用以破壞光束於導光板内部傳輸之全反射 條件’且使其散射以提高導光板出射光束之均勻性，進而 提高面光源系統之整，體性能，該網點之疏密、大小均可有 不同設計以適用於不同之面光源系統。 t一種習知面光源系統可參閱2 0 02年9月3日公告之美國 專利第6，4 4 3，5 8 3號（第一圖參照），該面光源系統丨〇 〇包 括一燈管110、一圍繞燈管110之燈罩12〇及一端部固持於 燈罩120之導光板2〇〇。該導光板2 〇〇包括入光面2〇1、底面 202及出光面203，其中，該燈管11〇係相對該入光面2〇1設 置。工作時，來自燈管丨1 〇及燈罩丨2 〇之光束於該導光板 2 0 0内部傳輸，並轉換為面光源經出光面2 〇 3出射。為增加 光束之利用率，該面光源系統1 〇 〇進一步包括依序排列於200409972 V. Description of the invention (1) [Technical field to which the invention belongs] ^ The present invention relates to a light guide plate and a surface light source system using the light guide plate, especially a light guide plate with high brightness and uniform light output and using the same Surface light source system for light guide plate. [Prior technology] It is widely used in pens because it has the advantages of lightness, thinness, and low power consumption. Modern information such as local telephones, mobile phones, and personal digital assistants are also available. Since the liquid crystal itself does not have light emitting characteristics, it is necessary to provide a surface light source system for the liquid crystal display function. 1 The surface light source system includes a light source and a light guide plate, and the light source is provided opposite to the light incident surface of the light guide plate. The light guide plate guides the transmission side of the light beam emitted from the light source ^ ′ and converts a linear light source or a point light source into a surface light source for emission. The bottom surface of the light guide plate: a plurality of dots are used to destroy the total reflection conditions of the light beam transmitted inside the light guide plate and scatter them to improve the uniformity of the light beam emitted by the light guide plate, thereby improving the overall and physical performance of the surface light source system. The density and size can be designed differently to suit different surface light source systems. For a conventional surface light source system, refer to US Patent No. 6,4 4 3,5 8 3 (refer to the first figure) published on September 3, 2002. The surface light source system includes a lamp tube. 110. A lamp cover 120 surrounding the lamp tube 110 and one end of the light guide plate 200 fixed to the lamp cover 120 are fixed. The light guide plate 2000 includes a light incident surface 201, a bottom surface 202, and a light emitting surface 203. The lamp tube 110 is disposed opposite to the light incident surface 201. During operation, the light beams from the lamp 丨 10 and the lampshade 丨 20 are transmitted inside the light guide plate 2000 and converted into a surface light source and emitted through the light emitting surface 203. In order to increase the utilization of the light beam, the surface light source system 100 further includes a sequential arrangement at
200409972 五、發明說明（2) 導光板200出光面— 卜卜 U ^ ^ ο,π 側之一擴散板220、第一稜鏡板23 0 一夂、兄反 ’該擴散板22 0係用以增強導光板2〇〇出 射光束之均勻度，二稜鏡板23〇及24〇則起聚 強面光源系統10 0之輝度。 T 曰 隹白Ϊ丄fSrf山源系統1〇0需採用二棱鏡板23 0及240以聚 面203出射之光束以提高輝度，採用擴 if # f A m、光束均勻，採用反射板210以提高光束利 用率：使其結構设雜、材料成本高且組裝不便。另，該面 光源系統1 0 0中存在較客本與人 ^™ i 又夕先學介面，光束於其間需經歷多 =輝仏成較大之光學損耗，影響面光源系統100 口疋提供種輝度較咼之導光板及一種結構簡單、 成本低、組裝便捷之面光源系統實為必要。 【發明内容】200409972 V. Description of the invention (2) Light-emitting surface of the light guide plate 200 — U ^ U ^ ^ ο, a diffuser plate 220 on the π side, the first fascia plate 23 0, and the other side, the diffuser 22 0 is used to enhance The uniformity of the light beam emitted by the light guide plate 2000, the second and second plates 23 and 24 start from the brightness of the concentrated surface light source system 100. T: The white source fSrf mountain source system 100 needs to use two prism plates 23 0 and 240 to emit light from the converging surface 203 to increase the brightness. It uses an expanded if # f A m, a uniform beam, and a reflection plate 210 to improve the brightness. Beam utilization: make its structure complicated, high material cost and inconvenient to assemble. In addition, the surface light source system 100 has a user interface and a human interface. The beam must undergo more optical losses in the meantime, which affects the surface light source system. A light guide plate with relatively low brightness and a surface light source system with simple structure, low cost, and convenient assembly are really necessary. [Summary of the Invention]
本發明之目的在於提供一種出光輝度較高 性較好、光學性能優良之導光板。 π X H f本發明之又-目的在於提供一種結構簡單、組裝便 捷、成本低且光學性能優異之面光源系統。 本發明面光源系統包括一導光板及至少一光源，該導 光板包括至少-用以接收光束之入射面、一 並引導光束出射之出射面及—與出射面相對之底面，;亥： 源係相對入射面設置。該底面分佈複數凸起，且凸起之散 射面構成-曲δ，用以會聚經凸起散射後之光束，底面及 散射面具有反射膜，用以防止光束逸出，從而提高導光板 200409972 I、發明說明（3) 2 at t :度。&出射面係可控制粗糙度分佈之板糙面，用 以發散光束，使出射光均句。 面用 二^其中，該複數凸起之散射面構成之曲面可為部分圓枝 =或，弧面。該反射膜係由叫與Τι〇2交替形成之多層薄 、，八於可見光區之反射率至少為98 %。該凸起可S / 球狀、圓台狀、矩形狀或立方體。該複數凸起可均勻 =布於底® ’其大小及密度亦可沿遠離人射面之 增加。 y ⑼ 该導光板可為平板形或楔形導光板。該光源可 源或點光源。 果九 該面光源系統可進一步包括一稜鏡板。 與習知技術相比較，本發明導光板之底面分佈複數凸 起，且凸起之散射面構成一特定形狀之曲面，可會聚經凸 起散射後之光束’底面及散射面具有反射膜以提高光束利 用率，其出射面係可控制粗糙度分佈之粗糙面，用以發散 光束’從而不但使得導光板出光輝度較高，其均勻性亦較 好、本發明面光源系統採用導光板及光源之組合，無須額 外使用反射板與擴散板，且可不使用棱鏡板或僅使用一棱 鏡板，其結構簡單、成本較低，且光束之能量損耗較小。 【實施方式】 請參閱第二圖’係本發明面光源系統第一實施方式， 該面光源系統1 〇包括一導光板20及二光源30。該導光板2〇 包括二入射面21、一與入射面21相連之出射面22及一與出 射面22相對之底面24。該光源30包括一燈管31及一部分圍The object of the present invention is to provide a light guide plate with high light emission and good optical performance. π X H f Another object of the present invention is to provide a surface light source system with simple structure, convenient assembly, 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. The light guide plate includes at least-an incident surface for receiving a light beam, an exit surface for guiding the light beam to exit, and-a bottom surface opposite to the exit surface; Set relative to the incident surface. The bottom surface is distributed with a plurality of protrusions, and the convex scattering surface constitutes a -curve δ to converge the light beam scattered by the protrusions. The bottom surface and the scattering surface have a reflective film to prevent the light beam from escaping, thereby improving the light guide plate 200409972 I Description of the invention (3) 2 at t: degree. & The exit surface is a rough surface that can control the roughness distribution, and is used to diverge the light beam to make the exit light uniform. The surface is composed of two surfaces, wherein the curved surface formed by the scattering surface of the plurality of protrusions may be a part of a round branch = or, an arc surface. The reflective film is made of a thin layer of alternating layers called T2 and T2, and the reflectance in the visible light region is at least 98%. The protrusion can be S / spherical, truncated, rectangular, or cubic. The plurality of protrusions can be uniformly distributed on the bottom ® ′, and its size and density can also increase along the surface away from the person. y ⑼ The light guide plate can be a flat or wedge-shaped light guide plate. The light source can be a source or a point light source. Guojiu The area light source system may further include a fascia. Compared with the conventional technology, the bottom surface of the light guide plate of the present invention is distributed with a plurality of protrusions, and the convex scattering surface forms a curved surface of a specific shape. Beam utilization rate, the exit surface is a rough surface that can control the roughness distribution to diverge the light beam, thereby not only making the light guide plate have a higher brightness but also better uniformity. The surface light source system of the present invention uses a light guide plate and a light source. In combination, there is no need to use a reflective plate and a diffuser plate, and no prism plate or only a prism plate is needed. The structure is simple, the cost is low, and the energy loss of the beam is small. [Embodiment] Please refer to the second figure ', which is the first embodiment of the 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 30. The light guide plate 20 includes two incident surfaces 21, an exit surface 22 connected to the incident surface 21, and a bottom surface 24 opposite to the exit surface 22. The light source 30 includes a lamp 31 and a part of the surrounding
200409972 五、發明說明（4) --- 乂 4垃官3 1之反射罩3 2。該二光源3 〇係分別相對該導光板 20之二入射面21設置。 明一併麥閱第二圖與第三圖，該導光板2〇之底面24分 佈複數凸起23。該複數凸起23係用以使光束散射，破壞自 入射，2 1進入之光束於導光板2 〇内部傳輸之全反射條件， 且提南自出射面22出射之光束之輝度及均勻性。該複數凸 起23係均勻分佈於該導光板2〇之底面24，其為立方體，亦 可為圓柱狀、圓台狀、球狀或矩形狀。該複數凸起2 3之散 射面25形成一曲面，其係部分圓柱面，用以會聚經凸起23 散射之光束，進而增強出射面22出射光束之輝度。該導光 板20之底面24及散射面25具有反射膜（未標示），該反射 膜係以S 1 〇2與T 1 〇2交替形成之多層薄膜，使投射於其上之 光束反射’以防止光束自導光板2〇之底面24逸出，從而降 低光束之能量損耗，提高導光板2〇之整體光學性能。該反 射膜可採用化學氣相沈積法、電子束蒸鍍法、濺鍍法等方 法形成，其在可見光區之反射率可達98 %以上。諼出射面 2 2 f系可控制粗糙度分佈之粗糙面，用以發散光束，使出 光均勻。 相較習知技術，由於本發明導光板2〇之底面24分佈複 數凸起23，且凸起23之散射面25構成一特定形狀之曲面， 可會聚經凸起23散射之光束，其底面24及散射面25具有反 射膜可提高光學利用率，且其出射面22係可控制粗糙度分 佈^，糙面，可用以發散光束，從而使得導光板20出光輝 度車乂尚且/、 义之均勻性。本發明面光源系統1 〇採用導 200409972 五、發明說明（5) 光板2 0及光源3 0之組合，無須額外使用反射板等外部元 件’其結構簡單、成本較低，且光束之能量損耗較小。 請一併參閱第四圖及第五圖，係本發明面光源系統第 二實施方式，該面光源系統11包括一光源3 0及一導光板 40。該導光板40包括一入射面41及一與入射面41相交之底 面44及一與底面44相對之出射面42，該光源30可為線光源 (如冷陰極螢光燈）或點光源（如發光二極體），其係相 對入射面41設置。該底面44與散射面45分佈複數凸起43， 該凸起4 3之散射面4 5形成一曲面，其係部分圓桎面，用以 會水經凸起4 3散射之光束。該凸起4 3之大小及密度沿遠離 入射面4 1之方向逐漸增加，用以改善導光板4 〇及面光源系 統11出射光束之均勻性。該底面4 4具有反射膜（未標 示）’該反射膜係以S i 02與T i 02交替形成之多層薄膜。該 出射面4 2係可控制粗糙度分佈之粗糙面，用以發散光束， 使出射光均勻。 請參閱第六圖及第七圖，係本發明面光源系統第三實 施方f式。該面光源系統12包括一光源30及一導光板60。該 導光板60係一楔形導光板，其包括一入射面61及一與入射 面61傾斜相連之底面64及一與底面64相對之出射面62。該 光源30係相對該入射面61設置。該導光板6〇之底面64分佈 複數凸起63。該複數凸起63係均勻分佈於該導光板60之底 面6 4 ’其為立方體，亦可為圓柱狀、圓台狀、球狀或矩形 狀。該複數凸起6 3之散射面6 5形成一曲面，其係部分圓柱 面’用以會聚經凸起63散射之光束，進而增強出射面62出200409972 V. Description of the invention (4) --- 乂 4 Luguan 31 1 Reflector 3 2. The two light sources 30 are respectively disposed opposite to the two incident surfaces 21 of the light guide plate 20. The second and third images are read together at the same time. The bottom surface 24 of the light guide plate 20 is provided with a plurality of protrusions 23. The plurality of protrusions 23 are used to scatter the light beam and destroy the self-incidence, the total reflection conditions of the light beam that 21 enters inside the light guide plate 20, and the brightness and uniformity of the light beam emitted from the exit surface 22 of Tinan. The plurality of protrusions 23 are uniformly distributed on the bottom surface 24 of the light guide plate 20, and are cubic, cylindrical, circular truncated, spherical, or rectangular. The scattering surface 25 of the plurality of protrusions 23 is formed as a curved surface, which is a part of a cylindrical surface for converging the light beam scattered by the protrusions 23, thereby enhancing the brightness of the light beam emitted from the emitting surface 22. The bottom surface 24 and the scattering surface 25 of the light guide plate 20 have a reflective film (not labeled). The reflective film is a multi-layer thin film formed by alternately S 1 02 and T 1 02 to reflect the light beam projected thereon to prevent reflection. The light beam escapes from the bottom surface 24 of the light guide plate 20, thereby reducing the energy loss of the light beam and improving the overall optical performance of the light guide plate 20. The reflective film can be formed by a method such as chemical vapor deposition method, electron beam evaporation method, sputtering method and the like, and its reflectance in the visible light region can reach more than 98%.谖 Emitting surface 2 2 f is a rough surface that can control the roughness distribution to diverge the light beam and make the light uniform. Compared with the conventional technology, the plurality of protrusions 23 are distributed on the bottom surface 24 of the light guide plate 20 of the present invention, and the scattering surface 25 of the protrusion 23 forms a curved surface of a specific shape. And the scattering surface 25 has a reflective film to improve the optical utilization rate, and its exit surface 22 can control the roughness distribution ^. The rough surface can be used to diverge the light beam, so that the light guide plate 20 has a uniform brightness and uniformity. . The surface light source system 1 of the present invention uses the guide 200409972. V. Description of the invention (5) The combination of the light plate 20 and the light source 30 does not require the use of external components such as a reflective plate. The structure is simple, the cost is low, and the energy loss of the light beam is relatively low. small. Please refer to the fourth and fifth figures together, which are the second embodiment of the surface light source system according to the present invention. The surface light source system 11 includes a light source 30 and a light guide plate 40. The light guide plate 40 includes an incident surface 41, a bottom surface 44 intersecting the incident surface 41, and an exit surface 42 opposite to the bottom surface 44. The light source 30 may be a linear light source (such as a cold cathode fluorescent lamp) or a point light source (such as Light emitting diode), which is disposed opposite to the incident surface 41. A plurality of protrusions 43 are distributed on the bottom surface 44 and the scattering surface 45, and the scattering surface 45 of the protrusion 43 forms a curved surface, which is a partially rounded surface for the light beam scattered by the protrusion 43. The size and density of the protrusions 43 are gradually increased 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 4 4 has a reflective film (not shown). The reflective film is a multilayer film formed by alternately S i 02 and T i 02. The exit surface 42 is a rough surface whose roughness distribution can be controlled to diverge the light beam and make the exit light uniform. Please refer to FIG. 6 and FIG. 7, which are f-forms of 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 obliquely connected to the incident surface 61 and an exit surface 62 opposite to the bottom surface 64. The light source 30 is disposed opposite the incident surface 61. A plurality of protrusions 63 are distributed on the bottom surface 64 of the light guide plate 60. The plurality of protrusions 63 are uniformly distributed on the bottom surface 6 4 ′ of the light guide plate 60. The protrusions 63 may be cubic, circular, truncated, spherical, or rectangular. The scattering surface 6 5 of the plurality of protrusions 6 3 forms a curved surface, which is a part of a cylindrical surface ′ for converging the light beam scattered by the protrusions 63 to further enhance the exit surface 62
第10頁 200409972 五、發明說明（6) 射光束之輝度。該導光板6 0之底面64及散射面65具有反射 膜（未標示）’以防止光束逸出，從而降低光束之能量損 耗’該出射面6 2係可控制粗糙度分佈之粗糙面，用以發散 光束，使出射光均勻。 請參閱第八圖，係本發明面光源系統第四實施方式。 該面光源系統13包括一光源30及一導光板6〇。為進一步會 聚經導光板6 0射出之光束，提高面光源系統丨3之出光輝 度’可於導光板60出射面62 —側設置一棱鏡板9〇。 請參閱第九圖，係本發明導光板之另一實施方式。該 導光板50與第二圖所示導光板2〇之結構大致相同，其包括 底面54及與底面54相對之出射面52。該底面54分佈複數 凸起53，該複數凸起53係均勻分佈於該導光板5〇之底面 54，其為立方體，亦可為圓柱狀、圓台狀、球狀或矩形 狀j该複數凸起5 3之散射面5 5形成一曲面，其係圓弧面， 用以會聚經凸起5 3散射之光束，進而增強出射面5 2出射光 束之=度。該導光板5〇之底面54及散射面55具有反射膜 (未丨標不）’以防止光束逸出，從而降低光束之能量損 f，該出射面52係可控制粗糙度分佈之粗糙面，用以發散 光束，使出射光均勻。 綜上所述，本發明符合發明專利要件，爰依法提出專 >明。惟以上所述者僅為本發明之較佳實施方式，舉 =热習本案技蟄之人士，在援依本案發明之精神所作之等 义修飾或變化，皆應包含於以下之申請專利範圍内。 第〗1頁 200409972 圖式簡單說明 第一圖係 第二圖係 第三圖係 第四圖係 第五圖係 第六圖係 第七圖係 第八圖係 第九圖係 【主要元 面光源系 導光板 入射面 出射面 凸起 底面 散射+面 光源 反射罩 習知技術面光源系統之剖視圖。 本發明面光源系統第一實施方式之立體圖 第二圖所示面光源系統之剖面圖。 參發明面光源系統第二實施方式之立體圖 第四圖所示面光源系統之剖面圖。 私發明面光源系統第三實施方式之立體圖 第六圖所示面光源系統之剖面圖。 私發明面光源系統第四實施方式之剖面圖 私發明導光板另一實施方式之局部剖視圖 ί牛符號說明】 洗 1 0 、11 、1 2 、1 3 20 〜40 、 50 ^ 60 21 、41 61 22 ^ 42 、 52 '62 23 、43 53 、63 24 > 44 54 、64 25 >45 λ 55 、65 30 燈 管 31 32 稜 鏡 板 90Page 10 200409972 V. Description of the invention (6) The brightness of the beam. The bottom surface 64 and the scattering surface 65 of the light guide plate 60 have a reflective film (not labeled) to prevent the light beam from escaping, thereby reducing the energy loss of the light beam. The light emitting surface 62 is a rough surface that can control the roughness distribution for Diverge the beam to make the emitted light uniform. Please refer to FIG. 8, which is a fourth embodiment of the surface light source system according to the present invention. The surface light source system 13 includes a light source 30 and a light guide plate 60. In order to further condense the light beams emitted through the light guide plate 60 and increase the light-emitting brightness of the surface light source system 3, a prism plate 90 may be provided on the 62-side of the light guide plate 60 exit surface. 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 includes a bottom surface 54 and an exit surface 52 opposite to the bottom surface 54. The plurality of protrusions 53 are distributed on the bottom surface 54, and the plurality of protrusions 53 are evenly distributed on the bottom surface 54 of the light guide plate 50. The protrusions 53 are cubic, cylindrical, circular truncated, spherical, or rectangular. The scattering surface 5 5 of 5 3 forms a curved surface, which is an arc surface, for converging the light beam scattered by the protrusion 5 3, thereby enhancing the degree of the emitted light beam from the emitting surface 5 2. The bottom surface 54 and the scattering surface 55 of the light guide plate 50 have a reflective film (not labeled) to prevent the light beam from escaping, thereby reducing the energy loss f of the light beam. The output surface 52 is a rough surface that can control the roughness distribution. Used to diverge the light beam and make the emitted light uniform. To sum up, the present invention complies with the elements of the invention patent, and a patent > However, the above are only the preferred embodiments of the present invention. For those who are eager to learn the techniques of the present case, the equivalent modifications or changes made in accordance with the spirit of the present invention should be included in the scope of the following patent applications. . Page 〖1,200,409,972 Schematic description of the first diagram is the second diagram is the third diagram is the fourth diagram is the fifth diagram is the sixth diagram is the seventh diagram is the eighth diagram is the ninth diagram system [main element surface light source This is a cross-sectional view of a surface light source system of a light guide plate with an incident surface and a convex bottom surface scattering + a surface light source reflector. Perspective view of the first embodiment of the surface light source system of the present invention. Refer to the perspective view of the second embodiment of the surface light source system of the invention. A sectional view of the surface light source system shown in the fourth figure. A perspective view of the third embodiment of the surface light source system of the present invention is a sectional view of the surface light source system shown in the sixth figure. Sectional view of the fourth embodiment of the surface light source system of the private invention. Partial cross-sectional view of another embodiment of the light guide plate of the private invention. Description of the symbol] Wash 1 0, 11, 1, 2, 1 3 20 to 40, 50 ^ 60 21, 41 61 22 ^ 42, 52 '62 23, 43 53, 63 24 > 44 54, 64 25 > 45 λ 55, 65 30 Light tube 31 32 Fascia 90