1 1332097 099年08月11日接正替換頁 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明係關於一種背光模組及其導光板。 【先前技術】 [〇〇〇2] 由於液晶顯示器具輕、薄、耗電小等優點，廣泛應用於 筆記本電腦、行動電話、個人數位助理等現代化資訊設 備。因為液晶顯示器中的液晶本身不具發光特性，為達 到顯示效果’需給液晶顯示器面板提供一面光源裝置， 如背光模組，其功能在於向液晶顯示器面板提供輝度充 分且分佈均勻之面光源。背光模組可按結構分為側光式 背光模組及直下式背光模組二種4其中，直下式背光模 組主要應用在LCD監視器或液晶電視等領域。 [0003] 請參閱第一圖，一種業界常用之先前技術之背光模組主 要由光源5、光源罩6、導光板3、反射板4、擴散板2及二 集光片1組成。其中，該光源5為線光源，主要有場致發 光燈（Electroluminiscent Lamp, EL)及冷陰極螢光 燈（Cold Cathode Fluorescence Lamp, CCFL)兩種 ’其設置於導光板3—側，藉由光源罩6之配合將光線傳 輸至該導光板3中。該導光板3之作用在於導引光源5發出 之光線從出光面7出射，同時提高顯示面板（圖未示）發 光輝度及均勻性。反射板4係設置於該導光板3之底面8之 一側’以將由導光板3之底面8出射之光線再次反射入該 導光板3内，提高光線之利用率。擴散板2之上下二表面 設有微小凸起（圖未示），其作用為將入射到擴散板2中 之光線散射而使顯示面板之圖案柔和化。集光片1亦稱棱 093137373 表單編號A0101 第4頁/共23頁 0993286782-0 13320971 1332097 Aug. 11, 2010, the replacement page. 6. Description of the Invention: [Technical Field] [0001] The present invention relates to a backlight module and a light guide plate thereof. [Prior Art] [〇〇〇2] Due to its advantages of light weight, thinness, and low power consumption, LCD devices are widely used in modern information devices such as notebook computers, mobile phones, and personal digital assistants. Since the liquid crystal in the liquid crystal display itself does not have the illuminating property, in order to achieve the display effect, it is necessary to provide the liquid crystal display panel with a light source device, such as a backlight module, whose function is to provide a surface light source with sufficient brightness and uniform distribution to the liquid crystal display panel. The backlight module can be divided into two types according to the structure: an edge-lit backlight module and a direct-lit backlight module. The direct-lit backlight module is mainly used in the fields of LCD monitors or LCD TVs. [0003] Referring to the first figure, a backlight module of the prior art commonly used in the industry is mainly composed of a light source 5, a light source cover 6, a light guide plate 3, a reflection plate 4, a diffusion plate 2, and two light collecting sheets 1. The light source 5 is a line light source, and mainly includes an electroluminescence lamp (EL) and a Cold Cathode Fluorescence Lamp (CCFL), which are disposed on the side of the light guide plate 3, by the light source. The cooperation of the cover 6 transmits light into the light guide plate 3. The function of the light guide plate 3 is to guide the light emitted from the light source 5 to exit from the light exit surface 7 while improving the brightness and uniformity of the display panel (not shown). The reflector 4 is disposed on one side of the bottom surface 8 of the light guide plate 3 to reflect the light emitted from the bottom surface 8 of the light guide plate 3 into the light guide plate 3 to improve the utilization of light. The upper and lower surfaces of the diffuser plate 2 are provided with minute projections (not shown) which function to scatter light incident on the diffuser plate 2 to soften the pattern of the display panel. Light collecting sheet 1 is also called edge 093137373 Form No. A0101 Page 4 of 23 0993286782-0 1332097
I 099年08月11日後正替換頁I 鏡板’其作用係對光線產生匯聚作用，以提高背光模組 之出光輝度，降低電能消耗。 [0004] 另—種業界常用的先前背光模組如第二圖所示，該背光 核组10包括一導光板22 ' —位於該導光板22—側的光源 20和—設置在該導光板22下方的反射板23。該光源20由 複數LED構成（圖中僅示出二顆），該導光板22包括一由多 個均勻分佈的細微V形槽構成的出光面221。 [0005] 使用時，由驅動裝置（圖未示）驅動光源20，點亮LED，由 LED發出的光線射入導光板2〇並藉由反射板23之反射，最 後由出光面221出射，投射至顯示面板（圖未示），完成顯 示功能。 [〇〇〇6] 然，該背光模組10之光源20僅^LED來先當。使用中， LED始終處於擊活狀態，即使在外界光線照度較高的情況 下’也無法充分利用外界光線，以降低能源消耗，從而 節約使用成本。 [0007] 有鑑於此，提供一種在外界光線照度較高的情況下，能 充分利用外界光線以降低能源消耗，從而節約使用成本 之背光模組及其導光板實為必需。 【發明内容】 [0008] 本發明之目的在於提供一種背光模組，該背光模組在外 界光線照度較高的情況下，能充分利用外界光線以降低 能源消耗。 [0009] 本發明之又一目的在於提供一種導光板，該導光板在外 界光線照度較高的情況下，能充分利用外界光線以降低 093137373 表單編號A0101 第5頁/共23頁 0993286782-0 1332097 099年08月11日梭正替換頁 能源消耗。 [0010] 本發明背光模組包括一導光板及一内置光源。所述導光 板包括一本體及一光切換裝置。該本體包括二相對設置 之入光面。該光切換裝置鄰近該入光面其中之一設置。 該内置光源設於遠離該光切換裝置之另一入光面附近。 該光切換裝置包括一受光體及一隔離體，當外界光線較 強時，外界光線從該受光體入射並傳輸至該本體；當外 界光線較弱時，光線由該内置光源提供並傳輸至該本體 〇 [0011] 本發明導光板包括一本體及一光切換裝置。該本體包括 二相對設置之入光面。該光切換裝置鄰近該入光面其中 之一設置。該光切換裝置包括一受光體及一隔離體，當 外界光線較強時，外界光線從該受光體入射並傳輸至該 本體；當外界光線較弱時，光線由設於該導光板之另一 入光面附近的内置光源提供並傳輸至該本體。 [0012] 相比於先前技術，因本發明背光模組及其導光板均包括 一光切換裝置，其包括一受光體及一隔離體，當外界光 線較強時，外界光線從該受光體入射並傳輸至該本體； 當外界光線較弱時，光線由設於該導光板之另一入光面 附近的内置光源提供並傳輸至該本體。即本發明背光模 組及其導光板能充分利用外界光線以降低能源消耗，從 而節約使用成本。 【實施方式】 [0013] 093137373 請一併參閱第三圖至第四圖，係本發明背光模組第一實 施方式之立體示意圖及其主視圖。該背光模組30包括一 表單編號A0101 第6頁/共23頁 0993286782-0 1332097 099年08月11日核正替換頁 導光板31，一内置光源32及一反射板33。 [0014] 該導光板31包括一本體313及一光切換裝置310。該本體 313為平行六面體結構，材質為透明聚合樹脂或玻璃，該 本體313具有一位於其頂部的出光面3131，一與該出光面 3131相對設置之底面315，及二夹於出光面3131與底面 315之間的相對設置的入光面314 〇該光切換裝置310鄰 近該二入光面314其中之一設置，本實施方式中以設於左 側為例加以說明。該光切換裝置31 〇包括一受光趙31 1及 一隔離體312，該受光體311與本體313可以分別製作並 相互黏貼於一體，亦或二者一體成型，本實施方式係一 體成型。該受光體311之外攀扇面31 π可為圓柱面或包含 至少一球冠面之球冠面陣列，本實施方式.選圓柱面。 相應地，與該受光體311相鄰的隔離體312的内輪廓面 3121的形狀與所述外輪廓面3111相吻合。所述内輪廓面 3121可用具較尚光反射率的金、銀、或鋁箔等材質製得 ，亦可於其上鍍以高反射層而得^另外，該隔離體312可 相對該受光體311之外輪廓面3Π丨移動。 [0015] [0016] [0017] 該内置光源32設於遠離光切換裝置31〇之另—入光面314 附近，該内置光源32可為單個或多個諸如LED等點光源， 亦可為CCFL等線光源，本實施方式中為兩個⑽。 該反射板33鄰近所述本體313之底面315設置。 請結合參《五圖至第六^使用中，#外界光線_ 強時’所述内置光源32處於關閉狀態（對於顯示品質要求 很高的場合，内置光源32亦可同時開啟，作為外界光線 093137373 表單編號A0101 第7頁/共23頁 0993286782-0 1 1332097 099年08月11日梭正替換百 bl的補充），隔離體312移動至背離外界光源處，即本實 施方式中受光體311外輪廓面3111之中下部。外界光線 bl從該外輪廓面3111之中上部入射，藉由該隔離體312 之内輪廓面3121之反射傳輸至該本體313，並從出光面 3131出射，最終射向顯示面板（圖未示），完成顯示功能 。當外界光線bl較弱時，該隔離體312移動至該受光體 311外輪廓面3111之中部，此時内置光源32處於擊活狀 態，入射光線al由該内置光源32提供並傳輸至該本體， 並藉由隔離體312之内輪廓面3121及反射板33之反射， 從出光面3131出射，最終射向顯示面板，完成顯示功能 〇 [0018] 相比於先前技術，因本背光模組30之導光板31包括一光 切換裝置310，其包括一受光體311及一隔離體312，當 外界光線bl較強時，外界光線bl從該受光體311入射並傳 輸至該本體313 ;當外界光線bl較弱時，入射光線al由内 置光源32提供並傳輸至該本體313。即本發明背光模組30 及其導光板31能充分利用外界光線bl以降低能源消耗， 從而節約使用成本。 [0019] 請參閱第七圖，係本發明背光模組第二實施方式之立體 結構示意圖。該背光模組40包括一内置光源42與一導光 板41，該導光板41包括一本體43及一光切換裝置44，該 光切換裝置44包括一受光體442及一隔離體441。相對於 第一實施方式，該背光模組40之改進之處在於：該受光 體442係一滾輪，該滚輪可繞其中心軸相對該本體43旋轉 ，其外輪廓面與鄰近其之入光面41 6相吻合。該隔離體 093137373 表單編號A0101 第8頁/共23頁 0993286782-0 1332097 099年08月11日梭正替換頁 441設於該滾輪徑向之部份表面上。另外，該本體43之底 面415上設由光反射層（圖未示）。 [0020] 請一併結合參閱第八圖及第九圖。使用中，當外界光線 b2較強時，所述内置光源42處於關閉狀態，所述隔離體 441旋轉至背離外界光線b2處，即本實施方式中受光體 442外輪廓面之中下部。外界光線bl從該外輪廓面之中上 部入射，藉由該隔離體441之反射傳輸至該本體43，並從 出光面出射，最終射向顯示面板（圖未示），完成顯示功 能。當外界光線b2較弱時，該隔離體441移動至與入光面 416相吻合處，此時内置光源42處於擊活狀態，入射光線 a2由該内置光源42提供並傳輸至該本體43，藉由隔離體 411及設於底面41 5之反射層的反射，從出光面出射，最 終射向顯示面板，完成顯示功能。 [0021] 綜上所述，本發明確已符合發明專利之要件，爰依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方 式，本發明之範圍並不以上述實施方式為限，舉凡熟習 本案技藝之人士援依本發明之精神所作之等效修飾或變 化，皆應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 [0022] 第一圖係先前技術背光模組之立體結構示意圖。 [0023] 第二圖係另一種先前技術之背光模組之立體結構示意圖 〇 [0024] 第三圖係本發明背光模組第一實施方式之立體結構示意 圖。 093137373 表單編號A0101 第9頁/共23頁 0993286782-0 1332097 __ 099年08月11日修正替換頁 [0025] 第四圖係第三圖之主視圖。 [0026] 第五圖係本發明背光模組第一實施方式中當外界光強度 較強時，外界光線由受光體入射之工作狀態示意圖。 [0027] 第六圖係本發明背光模組第一實施方式中當外界光強度 較弱時，由内置光源提供入射光線之工作狀態示意圖。 [0028] 第七圖係本發明背光模組第二實施方式之立體結構示意 圖。 [0029] 第八圖係本發明背光模組第二實施方式中當外界光線強 度較強時，外界光線由受光體入射之工作狀態示意圖。 [0030] 第九圖係本發明背光模組第二實施方式中當外界光線強 度較弱時，由内置光源提供入射光線之工作狀態示意圖 〇 【主要元件符號說明】 [0031] 背光模組：30, 40 [0032] 導光板：31，41 [0033] 内置光源：32，42 [0034] 反射板：33 [0035] 光切換裝置：310，44 [0036] 受光體：311，442 [0037] 隔離體：312，441 [0038] 本體：313，43 093137373 表單編號A0101 第10頁/共23頁 0993286782-0 1332097 099年08月11日修正替換頁 [0039] 入光面：314，416 [0040] 底面：315，415 [0041] 外輪廓面：3111 [0042] 内輪廓面：3121 [0043] 出光面：3131 [0044] 夕卜界光線：bl，b2 [0045] 入射光線：al，a2 093137373 表單編號A0101 第11頁/共23頁 0993286782-0I am replacing the page I mirror plate after August 11, 099. Its function is to concentrate the light to improve the light output of the backlight module and reduce the power consumption. [0004] Another prior art backlight module commonly used in the industry, as shown in the second figure, the backlight core group 10 includes a light guide plate 22' - a light source 20 on the side of the light guide plate 22 and - disposed on the light guide plate 22 The reflector 23 below. The light source 20 is composed of a plurality of LEDs (only two are shown), and the light guide plate 22 includes a light-emitting surface 221 composed of a plurality of uniformly distributed fine V-shaped grooves. [0005] In use, the light source 20 is driven by a driving device (not shown) to illuminate the LED, and the light emitted by the LED is incident on the light guide plate 2 and reflected by the reflecting plate 23, and finally emitted by the light emitting surface 221, and projected. Go to the display panel (not shown) and complete the display function. [〇〇〇6] However, the light source 20 of the backlight module 10 is only the first LED. In use, the LED is always in the active state, and even under the condition of high ambient light illumination, the external light can not be fully utilized to reduce energy consumption, thereby saving the use cost. In view of the above, it is necessary to provide a backlight module and a light guide plate which can fully utilize external light to reduce energy consumption, thereby saving cost of use, in the case where the external light illuminance is high. SUMMARY OF THE INVENTION [0008] It is an object of the present invention to provide a backlight module that can fully utilize external light to reduce energy consumption when the external light illuminance is high. [0009] Another object of the present invention is to provide a light guide plate which can fully utilize external light to reduce 934137373 under the condition of high ambient light illumination. Form No. A0101 Page 5 / Total 23 Page 0993286782-0 1332097 On August 11, 099, Shuttle is replacing page energy consumption. [0010] The backlight module of the present invention comprises a light guide plate and a built-in light source. The light guide plate includes a body and a light switching device. The body includes two oppositely disposed light incident faces. The light switching device is disposed adjacent to one of the light incident surfaces. The built-in light source is disposed adjacent to another light incident surface of the light switching device. The light switching device comprises a light receiving body and a separating body. When the external light is strong, external light is incident from the light receiving body and transmitted to the body; when the external light is weak, the light is provided by the built-in light source and transmitted to the light source. Body 〇 [0011] The light guide plate of the present invention comprises a body and a light switching device. The body includes two oppositely disposed light incident surfaces. The light switching device is disposed adjacent to one of the light incident surfaces. The light switching device includes a light receiving body and a spacer. When the external light is strong, external light is incident from the light receiving body and transmitted to the body; when the external light is weak, the light is disposed on the light guide plate. An internal light source near the entrance surface is provided and transmitted to the body. [0012] Compared with the prior art, the backlight module and the light guide plate thereof comprise a light switching device, which comprises a light receiving body and a spacer. When external light is strong, external light is incident from the light receiving body. And transmitting to the body; when the external light is weak, the light is provided by the built-in light source disposed near the other light incident surface of the light guide plate and transmitted to the body. That is, the backlight module and the light guide plate of the present invention can fully utilize external light to reduce energy consumption, thereby saving the use cost. [Embodiment] [0013] 093137373 Please refer to the third to fourth figures together, which is a perspective view of a first embodiment of the backlight module of the present invention and a front view thereof. The backlight module 30 includes a form number A0101, page 6 of 23, 0993286782-0 1332097, and a replacement of the light guide plate 31, a built-in light source 32 and a reflector 33. [0014] The light guide plate 31 includes a body 313 and a light switching device 310. The body 313 is a parallelepiped structure and is made of a transparent polymer resin or glass. The body 313 has a light-emitting surface 3131 at the top thereof, a bottom surface 315 opposite to the light-emitting surface 3131, and two clips on the light-emitting surface 3131. The light-incident surface 314 disposed opposite to the bottom surface 315 is disposed adjacent to one of the two light-incident surfaces 314. This embodiment is described by taking the left side as an example. The light-switching device 31 includes a light-receiving lens 31 1 and a spacer 312. The light-receiving body 311 and the body 313 can be separately formed and adhered to each other, or both can be integrally formed. The embodiment is integrally formed. The outer surface 31 π of the light receiving body 311 may be a cylindrical surface or a spherical crown array including at least one spherical crown surface. In this embodiment, a cylindrical surface is selected. Accordingly, the shape of the inner contour surface 3121. of the spacer 312 adjacent to the light receiving body 311 coincides with the outer contour surface 3111. The inner contour surface 3121 can be made of a material such as gold, silver, or aluminum foil having a light reflectance, or can be plated with a highly reflective layer, and the spacer 312 can be opposite to the light receiving body 311. The outer contour surface moves 3Π丨. [0017] [0017] The built-in light source 32 is disposed adjacent to the other light-incident surface 314 of the optical switching device 31. The built-in light source 32 can be a single or multiple point light sources such as LEDs, or can be a CCFL. The isoline light source is two (10) in this embodiment. The reflector 33 is disposed adjacent to the bottom surface 315 of the body 313. Please refer to the "5th to 6thth use, #外光_强时" The built-in light source 32 is in the off state (for high display quality requirements, the built-in light source 32 can also be turned on at the same time as external light 093137373 Form No. A0101 Page 7 / Total 23 Page 0993286782-0 1 1332097 On August 11, 2008, the shuttle is replacing the supplement of the hundred bl), the spacer 312 is moved away from the external light source, that is, the outer contour of the light receiving body 311 in this embodiment The lower part of the face 3111. The external light bl is incident from the upper portion of the outer contour surface 3111, and is reflected by the inner contour surface 3121 of the spacer 312 to the body 313, and is emitted from the light exit surface 3131, and finally directed to the display panel (not shown). , complete the display function. When the external light bl is weak, the spacer 312 moves to the middle of the outer contour surface 3111 of the light receiving body 311. At this time, the built-in light source 32 is in a live state, and the incident light light a is supplied from the built-in light source 32 and transmitted to the body. And by the reflection of the inner contour surface 3121 of the spacer 312 and the reflection plate 33, the light is emitted from the light-emitting surface 3131, and finally is directed to the display panel to complete the display function. [0018] Compared with the prior art, the backlight module 30 is The light guide plate 31 includes a light-switching device 310, and includes a light-receiving body 311 and a spacer 312. When the external light bl is strong, the external light bl is incident from the light-receiving body 311 and transmitted to the body 313; When weak, the incident light a1 is supplied from the built-in light source 32 and transmitted to the body 313. That is, the backlight module 30 and the light guide plate 31 of the present invention can fully utilize the external light bl to reduce energy consumption, thereby saving the use cost. [0019] Referring to FIG. 7, a perspective view of a second embodiment of a backlight module of the present invention is shown. The backlight module 40 includes a built-in light source 42 and a light guide plate 41. The light guide plate 41 includes a body 43 and a light switching device 44. The light switching device 44 includes a light receiving body 442 and a spacer 441. Compared with the first embodiment, the backlight module 40 is improved in that the light receiving body 442 is a roller, and the roller is rotatable relative to the body 43 about a central axis thereof, and the outer contour surface and the light incident surface adjacent thereto 41 6 matches. The spacer 093137373 Form No. A0101 Page 8 of 23 0993286782-0 1332097 On August 11th, the shuttle replacement page 441 is placed on the radial surface of the roller. In addition, the bottom surface 415 of the body 43 is provided with a light reflecting layer (not shown). [0020] Please refer to the eighth and ninth figures together. In use, when the external light b2 is strong, the built-in light source 42 is in a closed state, and the spacer 441 is rotated away from the external light b2, that is, in the middle and lower portions of the outer contour surface of the light receiving body 442 in the present embodiment. The external light bl is incident from the upper portion of the outer contour surface, is transmitted to the body 43 by the reflection of the spacer 441, and is emitted from the light exit surface, and finally is directed to the display panel (not shown) to complete the display function. When the external light b2 is weak, the spacer 441 moves to coincide with the light incident surface 416. At this time, the built-in light source 42 is in a live state, and the incident light a2 is supplied from the built-in light source 42 and transmitted to the body 43. The reflection of the spacer 411 and the reflective layer provided on the bottom surface 41 5 is emitted from the light-emitting surface, and finally is directed to the display panel to complete the display function. [0021] In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS [0022] The first figure is a schematic perspective view of a prior art backlight module. 2 is a perspective view showing a three-dimensional structure of a backlight module of another prior art. [0024] The third drawing is a schematic perspective view of a first embodiment of a backlight module of the present invention. 093137373 Form No. A0101 Page 9 of 23 0993286782-0 1332097 __ August 11, 2017 Correction Replacement Page [0025] The fourth diagram is the front view of the third diagram. The fifth figure is a schematic view showing an operation state in which external light is incident from a light receiving body when the external light intensity is strong in the first embodiment of the backlight module of the present invention. [0027] FIG. 6 is a schematic diagram showing the working state of the incident light provided by the built-in light source when the external light intensity is weak in the first embodiment of the backlight module of the present invention. [0028] The seventh drawing is a schematic perspective view of a second embodiment of the backlight module of the present invention. 8 is a schematic view showing an operation state in which external light is incident by a light receiving body when the external light intensity is strong in the second embodiment of the backlight module of the present invention. [0031] FIG. 9 is a schematic diagram showing the working state of the incident light provided by the built-in light source when the external light intensity is weak in the second embodiment of the backlight module of the present invention. [Main component symbol description] [0031] Backlight module: 30 , 40 [0032] Light guide: 31, 41 [0033] Built-in light source: 32, 42 [0034] Reflector: 33 [0035] Light switching device: 310, 44 [0036] Light-receiver: 311, 442 [0037] Isolation Body: 312, 441 [0038] Body: 313, 43 093137373 Form No. A0101 Page 10/Total 23 Page 0993286782-0 1332097 Correction Replacement Page [0039] on August 11, 099 Light Entry: 314,416 [0040] Bottom surface: 315, 415 [0041] Outer contour surface: 3111 [0042] Inner contour surface: 3121 [0043] Light-emitting surface: 3131 [0044] 夕布界光: bl, b2 [0045] Incident light: al, a2 093137373 Form No. A0101 Page 11 of 23 0993286782-0