200900805 P27960006TW 23964twf.doc/p 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種導光板的結構，且特別是有關於 -種應用在直下式背光裝置中之導光板的結構。 【先前技術】 _以目别來說’穿透式或是半穿透半反射式的液晶顯示 都而要@光裝置’以提供液晶面板所需之面光源，而。 。 。 。 。 。 。 。 . [Prior Art] _ In other words, 'transparent or transflective liquid crystal display, all of which are required to provide a surface light source for a liquid crystal panel, and
使液晶顯示的效果。-般來說，背光裝置區分 ^直:式背光裝置與側面4式背絲置。相較於侧面入 f式月光裝置，直下式背光裝置可以提供較高亮度之面光 ^ ’因此當對光源之亮度有較高需求時，通常採用直下 背光裝置。 、目前的背光裝置’為了達到省電、體積小、啟動快速 ^及增加使料命的目的，財都會使用發光二極體當作 ^源ϋ發光二極體的臨界電壓，會隨著使用時間 ^力^漂移，導致背絲置所產生的光源會不穩定。而 這個問題，在有㈣光裝置中安裝有_測 i仿發光二極顏產生之光線強度的變化，並 又偵測結果來調整發光二極體的工作電、*，蚀北 農置的表現不會隨使用時間的增加而變動。 月 二，來說，背光裝置中的絲測器，不會配置在發光 方、，it Γ是，若是將光躺器配置在發光源的正前 面 在大ΐ二Γ光裝置所產生之面光源的均勻度。因此， 大心的產品令’光侧器都是配置在發光源 23964twf.doc/p 200900805Make the effect of liquid crystal display. In general, the backlight device distinguishes between a straight type backlight device and a side 4 type back wire. Compared with the side-in-flight moonlight device, the direct-lit backlight device can provide a higher-brightness surface light. Therefore, when there is a high demand for the brightness of the light source, a direct-lit backlight device is usually used. In the current backlight device, in order to achieve power saving, small size, fast start-up and increase the life of the material, the financial use of the light-emitting diode as the threshold voltage of the light-emitting diode will be used. The force ^ drift causes the light source generated by the back wire to be unstable. And this problem, in the (four) optical device is installed with _ measured i-like light-emitting diodes generated by the change in light intensity, and the detection results to adjust the working power of the light-emitting diode, *, the performance of the eclipse It will change with the increase of usage time. On the second day of the month, the wire detector in the backlight device is not disposed on the light-emitting side, and it is, if the light-receiver is placed in front of the light source, the surface light source generated by the large-sized two-light device Uniformity. Therefore, the products of the big heart make the 'light side devices are all arranged in the light source 23964twf.doc/p 200900805
χ ^ /^uuu06TW 例如在美國專利公告第5490005號專利中（以下簡稱 US5490005專利），就是利用一導光板將發光源所產生的光 線引導入射光偵測器。 然而’在US5490005專利中，入射至導光板的光線與 導光板之間的入射角需要非常的大，光線幾乎是以導光板 之入光面平行的角度入射至導光板，才能夠在導光板内以 全反射的形式來傳遞，而被光偵測器所接收到。因此，光 偵測器所感測到的光訊號非常微弱，並且難以判定。解決 的方法是’在發光源陣列的四週配置許多的光強度感測 器，以加強判斷的準確度。然而，這樣的解決手段卻會導 致背光裝置的製造成本上升。 【發明内容】 因此，本發明提供一種直下式背光裝置中的導光板， 可以增加光線在導光板令產生全反射的機會。 本發明也提供一種光線強度之偵測模組，可以增加散 射光線被感測到的機會。 另外，本發明也提供一種直下式背光裝置，可以有效 地偵測到發光源所產生的光線強度。 本發明提供一種直下式背光裝置中的導光板，其具有 一入光面。本發明之導光板的特徵在於，在其入光面上可 以具有多個凹陷之微結構。 在本發明的實施例中，導光板上的微結構可以是半球 形結構、圓錐形結構或是圓柱形結構。 從另-觀點來看，本發明提供—種光線強度之侦測模 200900805 rz/y〇uu〇6TW 23964twf.doc/p 組，可以適用於一直下式背光“ 括-導光板和-光侧單元。包 -第-出光面。其中人光面板至少具有—入光面和 先面上具有多個例如半球 =、0錐Μ疋0㈣相叫之微結構。 早元則配置在導光板第3 = 射之光線的強度。 出尤曲出 從另-觀點來看，本發明提供—種直下式 =數=;原、，反和—光㈣元，板至 ν具有-人先面和-弟-出光面，並且人光面之 一 ίΪ= 一預設角度與第—出光面相接。較特別的是， ^光板的人光面上具有多個凹陷之微結構，例 =結構、®_微結構或是圓細彡微結構等。在本發明的 二施例中，每-微結構都相對其中—發絲，使得每一發 光源所產生的光線可峨對應之微結構人射至導光板内: 光_單元可以配置於第1光面，以感測從第一 出光面出射之光線的強度。 由於本發明所提供的導光板，在入光面上具有多數個 凹陷的微結構。因此，本發明可加光線在導光板中產 生全反射的機會’以更有效率地監測發統所產生之光線 的亮度。 為讓本發明之上述和其他目的、特徵和優點能更明顯 易幢’下文特舉較佳實施例，並配合所關式，作詳細說 明如下。 200900805 rz/y〇uu06TW 23964twf.doc/p 【實施方式】 圖l繪示為依照本發明之一較佳實施例的—種直 、 背光裝置之剖面結構圖。請參照圖1，本發明所提供式 下式背光裝置100包括多數個發光源，例如1〇2、^ 106。另外，直下式背光裝置100還包括偵測模組11〇和擴 散板116。其中，偵測模組110是配置在發光源1〇2、1〇4 和106之上，以偵測發光源102、104和1〇6發出之光線的 強度，而擴散板116則配置在偵測模組11〇之上。 發光源102、104和106是用來作為背光裝置1〇〇的光 源。當發光源並102、104和106所產生的色光透過伯測模 組110而到達擴散板116時，就可以在擴散板116内產生 擴散的效應並且互相混合，以產生均勻的白光面光源。一 般來說’發光源102、104和106可以利用發光二極體來實 現。在本實施例中，發光源102、1〇4和1〇6可以包括紅色 發光一極體、綠色發光一極體和藍光發光二極體。而在一 些選擇實施例中’發光源102、1〇4和1〇6也可以利用白光 發光二極體來實現。 償測模組110可以包括導光板U2和光偵測單元 114。在本實施例中’導光板112可以配置在發光源1〇2、 104和106上’而光偵測單元114則配置在導光板112的 一側。藉此’導光板112就可以將發光源1〇2、1〇4和106 所產生之光線的部分引導至光偵測單元114,以偵測發光 源102、104和1〇6所產生的光線。 圖2纟會示為依照本發明之一較佳實施例的一種光線強 200900805 F27960〇〇6TW 23964twf.doc/p 度之偵測模組的立體結構圖。請參照圖2，導光板112具 有一入光面202，並且具有一第一出光面2〇4和一第二出 光面206。在本實施例中，入光面202之一侧以一預設角 度與苐一出光面204相接。在本實施例中，此預設角度可 以是90度角。另外，第二出光面2〇6則相對於入光面2〇2, 並且在一可視範圍中’並不與入光面2〇2相接。另外，光 偵測單元114則可以配在第一出光面204上。藉此，光偵 ( 測單元Η4就可以该測從第一出光面204出射之光線的強 度。在一些實施例中，入光面202可以鍍上一層抗反射層 或疋使用光學反射片，使從第—出光面204反射回向第一 入光面202的光線能夠再度反射，減少光線的損失。 另外’導光板112更具有多個反射面，例如212、214、 216和218 ’皆是配置在入光面202和第二出光面206之 間，並且都可以鑛上一層反射的材料。 特別的是，入光面202上具有多數個凹陷的微結構， 例如222、224、226和2]8。在本實施例中，這些微結構 I 可以利用半球形結構來實現。然而，在一些選擇實施例中， 這些微結構222、224、226和228也可以利用原錐形結構 或是圓柱形結構來實施。 圖3緣示為依照本發明之一較佳實施例的一種發光源 之光線在導光板内傳遞的示意圖。請參照圖3,導光板112 之入光面202上的每一微結構，都分別相對配置在直下式 月光裝置中之發光源的其中之一。例如，微結構相對 於發光源304。當發光源302產生光線時，會先到達微結 200900805 23964twf. d〇c/pFor example, in U.S. Patent Publication No. 549,0005 (hereinafter referred to as US5490005), a light guide plate is used to guide the light generated by the light source to the incident light detector. However, in the US5490005 patent, the incident angle between the light incident on the light guide plate and the light guide plate needs to be very large, and the light is incident on the light guide plate at an angle parallel to the light incident surface of the light guide plate, so that it can be in the light guide plate. Passed in the form of total reflection, and received by the photodetector. Therefore, the optical signal sensed by the photodetector is very weak and difficult to determine. The solution is to deploy a number of light intensity sensors around the array of illumination sources to enhance the accuracy of the decision. However, such a solution would result in an increase in the manufacturing cost of the backlight. SUMMARY OF THE INVENTION Accordingly, the present invention provides a light guide plate in a direct type backlight device, which can increase the chance of light being totally reflected at the light guide plate. The present invention also provides a light intensity detection module that increases the chance that scattered light is sensed. In addition, the present invention also provides a direct type backlight device capable of effectively detecting the intensity of light generated by a light source. The present invention provides a light guide plate in a direct type backlight device having a light incident surface. The light guide plate of the present invention is characterized in that it has a plurality of recessed microstructures on its light incident surface. In an embodiment of the invention, the microstructure on the light guide plate may be a hemispherical structure, a conical structure or a cylindrical structure. From another point of view, the present invention provides a light intensity detecting mode 200900805 rz/y〇uu〇6TW 23964twf.doc/p group, which can be applied to the following backlights "including - light guide plate and - light side unit The package-first-light-emitting surface, wherein the human light panel has at least a light-incident surface and a first surface having a plurality of microstructures such as hemisphere=, 0 cone Μ疋0 (four), and the first element is disposed on the light guide plate. The intensity of the light emitted. From the other point of view, the present invention provides a direct type = number =; original, reverse and - light (four) yuan, plate to ν has - first face and - brother - The light surface, and one of the human face ίΪ= a preset angle is connected to the first light-emitting surface. More specifically, the light surface of the light plate has a plurality of concave microstructures, for example, structure, ®_micro The structure is either a circular fine microstructure or the like. In the second embodiment of the present invention, each of the microstructures is relatively hair-in-phase, so that the light generated by each of the light sources can be directed to the corresponding light-structured person to the light guide plate. The light_unit may be disposed on the first light surface to sense the intensity of the light emitted from the first light exiting surface. The light guide plate is provided with a plurality of concave microstructures on the light incident surface. Therefore, the present invention can increase the brightness of the light generated by the light source by adding light to the opportunity of total reflection in the light guide plate. The above and other objects, features, and advantages of the present invention will become more apparent from the <RTIgt; 1 is a cross-sectional structural view of a straight and backlight device according to a preferred embodiment of the present invention. Referring to FIG. 1, a backlight device 100 of the present invention includes a plurality of illumination sources. For example, the direct-type backlight device 100 further includes a detecting module 11A and a diffusing plate 116. The detecting module 110 is disposed at the light-emitting sources 1〇2, 1〇4, and 106. In order to detect the intensity of the light emitted by the illumination sources 102, 104 and 1 , the diffusion plate 116 is disposed on the detection module 11 . The light sources 102 , 104 and 106 are used as the backlight 1光源 light source. When the light source and 102, 104 and 106 When the generated color light passes through the test module 110 and reaches the diffusion plate 116, a diffusion effect can be generated in the diffusion plate 116 and mixed with each other to generate a uniform white surface light source. Generally, the illumination sources 102, 104 and 106 can be implemented by using a light emitting diode. In this embodiment, the light sources 102, 1〇4, and 1〇6 can include a red light emitting body, a green light emitting body, and a blue light emitting diode. In the embodiment, the illumination sources 102, 1〇4, and 1〇6 can also be implemented by using a white light emitting diode. The compensation module 110 can include a light guide plate U2 and a light detecting unit 114. In the present embodiment, the light guide plate 112 may be disposed on the light-emitting sources 1, 2, 104, and 106, and the light detecting unit 114 is disposed on one side of the light guide plate 112. Thereby, the light guide plate 112 can guide the portions of the light generated by the light sources 1〇2, 1〇4 and 106 to the light detecting unit 114 to detect the light generated by the light sources 102, 104 and 1〇6. . FIG. 2A is a perspective structural view of a detection module with a light intensity of 200900805 F27960〇〇6TW 23964twf.doc/p according to a preferred embodiment of the present invention. Referring to FIG. 2, the light guide plate 112 has a light incident surface 202 and has a first light exit surface 2〇4 and a second light exit surface 206. In this embodiment, one side of the light incident surface 202 is in contact with the first light exiting surface 204 at a predetermined angle. In this embodiment, the preset angle may be a 90 degree angle. Further, the second light-emitting surface 2〇6 is opposite to the light-incident surface 2〇2, and is not in contact with the light-incident surface 2〇2 in a visible range. In addition, the light detecting unit 114 can be disposed on the first light emitting surface 204. Thereby, the light detecting unit 4 can measure the intensity of the light emitted from the first light exiting surface 204. In some embodiments, the light incident surface 202 can be plated with an anti-reflective layer or by using an optical reflecting sheet. The light reflected from the first light-emitting surface 204 back to the first light-incident surface 202 can be reflected again to reduce the loss of light. In addition, the light guide plate 112 has a plurality of reflective surfaces, for example, 212, 214, 216, and 218' are all configured. Between the light-incident surface 202 and the second light-emitting surface 206, and a layer of reflective material can be mineralized. In particular, the light-incident surface 202 has a plurality of concave microstructures, such as 222, 224, 226 and 2] 8. In this embodiment, the microstructures I can be implemented using a hemispherical structure. However, in some alternative embodiments, the microstructures 222, 224, 226, and 228 can also utilize a native tapered structure or a cylindrical shape. The structure is implemented. Fig. 3 is a schematic view showing the transmission of light from a light source in a light guide plate according to a preferred embodiment of the present invention. Referring to Fig. 3, each light incident on the light incident surface of the light guide plate 112 Structure In the direct type one moon means of the light emitting source. For example, with respect to the microstructure 304. When the light emission source 302 light emission source generating light, will first reach the microstructure 200900805 23964twf. D〇c / p
F27960006TW 構3〇2外側的表面，並且在進入導光板112後產生折射。 而根據實驗的結果，#人射光線與微結構外絲面之法 所夾的入射角6以41.8、9〇。的範圍内，就會在導光板山 内循A1的路杈，以全反射的方式傳遞。 因此’大約僅有佔總光強度·_20%的光線會以全 f的方式傳遞，而從第一出光面綱出射，並且被光伽 早το 114所制到。另外大部分的光線在導光&山内F27960006TW The outer surface of the 3〇2 and the refraction after entering the light guide plate 112. According to the results of the experiment, the incident angle 6 of the method in which the person shoots the light and the outer surface of the microstructure is 41.8, 9〇. Within the scope of the guide, it will follow the path of A1 in the light guide plate and transmit it in the form of total reflection. Therefore, only about the total light intensity _20% of the light will be transmitted in the form of all f, but from the first illuminating surface, and by the light gamma early το 114. In addition, most of the light is in the light guide &
不會以全反射的形式傳遞，而從第二出光面2〇6出射，並 且到達擴散板116而產生一白光面光源。由此可知，本 明=提出的彳貞難組並*會影像f光裝置所產生之面光^ 的亮度。 “It is not transmitted in the form of total reflection, but exits from the second illuminating surface 2〇6 and reaches the diffusing plate 116 to produce a white light source. From this, it can be seen that the brightness of the surface light generated by the f-light device is the same as that proposed. "
圖4緣示依照本發明之一較佳實施例的_種發光源盘 光強度感測單元之距離與可靠度的關係圖。請參照圖4，、 曲線4〇2代表若是導光板的入光面上沒有微結構時的狀 況。從曲線402可知，當導光板的入光面沒有微結構時， 則光偵測單元僅能_半徑大約4公分範_的發光源所 產生的光線，並且量測到相距4公分之發光源所發出光線 的光強度大約僅有距離1公分時所測量到光強度之2〇%， 不利於訊號處理。然而，若是導光板之人光面:有微結°構 的設計’則光偵測器偵測到相距4公分之發光源所發出之 光線的光強度則有相距1公分所量測光強度值9〇%以上。 而根據實驗的結果，若是在導光板的入光面上設置微釺 構’則光偵測單元可以量測到半徑20公分範圍以： 源所產生的光線。 X 200900805 r"，〇wW6TW 23964twf.doc/p 的光是利用本發明所提供的導光板，則相同 測到更大範圍内之發光源所產生的 ί線疋以，本發明所提供的m置内，*需要設置太 Γ==即可有效地债測所有發光源所產生的光 線’而使传本發明的製造成本可以有效地降低。 另外，若是設計者認為在導光板m内產生全反射之 Γ =強=例ΐ高，而影響到f光|置所產生之面光源的 免度’也可以透過改變微結構的形式 之光線強度的比例。 千吸座王王及町 繪ϊί依照本發明另一實施例的-種微結構形式 的側視圖4純圖5 ’導光板112之入光面綱上的微 結構:也可以利用微結構502來實5見。在本實施例中，入 射至導光板m的光線，f要與微結構观賴表面之法 線形成8〇 _9〇°的人射角’才可以在導光板ιΐ2内以全反 射的形式來傳遞。因此，僅有佔總光線強度5%以下的光 線才會在導光板112中以全反射的形式傳遞，而90%以上 的光線都可以從第二出光面施出射而形成面光源。 綜上所述，由於本發明之導光板的入光面上具有微結 構。此使得本發明所提供时光裝置不但製造成本較 低，量測可靠度較高，並且更不會影響到背光裝置所形成 之面光源的亮度。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限,本發明，任何熱習此技藝者，在不脫離本發明之精神 和範圍内’當可作些許之更動與獅，因此本發明之保護 200900805 P2/960006TW 23964twf.doc/p 範圍當視後附之申請專利範 【圖式簡單說明】 圖1纟會不為依照本發明 背光裝置之剖面結構圖。 圍所界定者為準。 之—較佳實施例的一種直下式 ^2繪示為依照本發明之—較佳實施例的一種光線強 度之偵測模組的立體結構圖。Figure 4 is a diagram showing the relationship between the distance and the reliability of a light source sensing unit of a light source disk according to a preferred embodiment of the present invention. Referring to Fig. 4, curve 4〇2 represents a condition when there is no microstructure on the light incident surface of the light guide plate. As can be seen from the curve 402, when the light incident surface of the light guide plate has no microstructure, the light detecting unit can only generate light generated by the light source with a radius of about 4 cm, and measure the light source source separated by 4 cm. The intensity of the emitted light is only about 2% of the measured light intensity at a distance of 1 cm, which is not conducive to signal processing. However, if the light side of the light guide plate has a micro-junction design, the light detector detects the light intensity of the light emitted by the light source separated by 4 cm, and the light intensity value is 1 cm apart. More than 9〇%. According to the experimental results, if the micro-structure is placed on the light-incident surface of the light guide plate, the light detecting unit can measure the radius of 20 cm to: the light generated by the source. X 200900805 r", 〇wW6TW 23964twf.doc/p The light is obtained by using the light guide plate provided by the present invention, and the same is detected by the illuminating source generated by the illumination source in a larger range, the m-position provided by the present invention Inside, * need to set too Γ == can effectively measure the light generated by all the illuminating sources', so that the manufacturing cost of the invention can be effectively reduced. In addition, if the designer thinks that the total reflection in the light guide plate m is Γ = strong = the height is high, and the degree of freedom of the surface light source generated by the f light is also changed by changing the light intensity in the form of the microstructure. proportion. A side view of a microstructure in accordance with another embodiment of the present invention. FIG. 4 is a schematic view of the microstructure of the light guide plate of the light guide plate 112: the microstructure 502 can also be utilized. See you in fact. In the present embodiment, the light incident on the light guide plate m, f is formed with the normal angle of the microstructure on the surface to form a human angle of 8 〇 _9 〇 ° can be in the form of total reflection in the light guide plate ι ΐ 2 transfer. Therefore, only light rays which are less than 5% of the total light intensity are transmitted in the form of total reflection in the light guide plate 112, and more than 90% of the light can be emitted from the second light exiting surface to form a surface light source. In summary, the light guide plate of the present invention has a microstructure on the light incident surface. This makes the time device provided by the present invention not only low in manufacturing cost, but also has high measurement reliability, and does not affect the brightness of the surface light source formed by the backlight device. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the scope of the present invention, and it is possible to make some modifications to the lion without departing from the spirit and scope of the present invention. Protection of the present invention 200900805 P2/960006TW 23964twf.doc/p Scope of the application Patent Application [Simplified Description of the Drawings] FIG. 1 is a cross-sectional structural view of a backlight device according to the present invention. The definition of the enclosure shall prevail. A direct type II of the preferred embodiment is a perspective view of a light intensity detecting module in accordance with a preferred embodiment of the present invention.
=緣7F為依照本翻之—較佳實施例的—種發光源 之光線在導光板内傳遞的示意圖。 "圖4!會:依照本發明之—較佳實施例的一種發光源與 光強度感測單元之距離與可靠度的關係圖。 圖5繪示為依照本發明另—實施例的一種微結構形式 的侧視圖。 【主要元件符號說明】 100 :直下式背光裝置 102、104、106、304 :發光源 112 導光板 114 光镇測單元 116 擴散板 202 入光面 204 第一出光面 206 第二出光面 212、214、216、218 :反射面 222、224、226、228、302、502 :微結構 4〇2、404 :可靠度曲線 Θ c :入射角 12= edge 7F is a schematic view of the light source of the illumination source being transmitted in the light guide plate in accordance with the preferred embodiment. "Fig. 4: A diagram showing the relationship between the distance and reliability of an illumination source and a light intensity sensing unit in accordance with a preferred embodiment of the present invention. Figure 5 is a side elevational view of a microstructure in accordance with another embodiment of the present invention. [Main component symbol description] 100: Direct type backlight device 102, 104, 106, 304: light source 112 light guide plate 114 photo-stimulation unit 116 diffuser plate 202 light-incident surface 204 first light-emitting surface 206 second light-emitting surface 212, 214 , 216, 218: reflective surface 222, 224, 226, 228, 302, 502: microstructure 4 〇 2, 404: reliability curve Θ c: incident angle 12