200921149 八、發明說明： 【發明所屬之技術領域】 本發明係一種導光擴散元件及其應用之光源模組，尤指一種 應用於直下式光源模組，可利用其元件之光學結構設計而提高光 源模組之出光均勻度及輝度之構件。 【先前技術】 隨著LCD之尺寸越大，側光式結構已無法在重量、消費電力及 亮度上佔有優勢’因此不含導光板且光源置於模組下方之直下式 背光模組便因運而生。-般習知之直下式背光模組，其構造大致 可包括一光源、反射片、擴散板及稜鏡片等，光學膜片係用一至 多張數量不等之各種光學膜片互相搭配而成，藉以改善光源模組 所形成明暗區塊現象之問題。200921149 VIII. Description of the Invention: [Technical Field] The present invention relates to a light guiding diffusion element and a light source module thereof, and particularly to a direct light source module, which can be improved by using an optical structure design of the component A component of the light source module that emits light uniformity and brightness. [Prior Art] As the size of the LCD is larger, the side-light structure can no longer have an advantage in weight, power consumption and brightness. Therefore, the direct-lit backlight module without the light guide plate and the light source placed under the module is shipped. Born. A conventional direct-lit backlight module, the structure of which may include a light source, a reflection sheet, a diffusion plate, and a cymbal. The optical film is formed by using one or more optical films of different numbers. Improve the problem of light and dark block phenomenon formed by the light source module.
已知之直下式背光模組其光源以CCFL&LED為主，又，因LED 驅動速度較快，使LCD色彩不會過於單獨，並可避免殘影，同時可 發展成不使用彩色渡光片之功效，使光的使用率增為2倍以上，故 LED背光模組是被市場所期待的技術之一。 然而’以LED作為光源時，常會遇到擴散不均的問題，為增加 平均出光輝度常增加光學膜片之張數，然又為了提高亮度，必須 增設多個統’賴於增加耗f纽衍生出散熱的骑；另外，、 擴散板之作用僅在令所通過之光線均勾散出，對於改善平均輝度 之效果有1¾且有些背光模組刻意拉長光源與擴散板之間隙，以 其擴大各光源進入擴散之範圍，致使背光模組之厚度增加。 5 200921149 為達薄型化及輕量化等目標，未來光源的選擇、排列方式及 微結構的設計、光學膜片的光學效率，應思考如何設計各光學組 件之最佳化結構及整合各光學組件於一元件之中為勢所必行。 為降低成本與提升背光模組之均勻度與輝度，新型的光學擴 散增焭板之設計所在多有，如一習知之技術揭示，係於導光板上 設計如菲涅爾（Fresnel)透鏡之光學耦合透鏡，以使該導光材具有 聚光之功效，然該紋路之製程困難，非屬理想。 為&升光源之均勻性，另一習知技術係設計一光學透鏡，如 第一圖（A)之侧視圖及第一圖（β)之立體圖所示，該透鏡設有 一弯狀空隙(dome-shaped air gap)，並將該光學透鏡置於每一led 光源體上，其弯狀空隙恰可含蓋⑽於其内，該透鏡之功能可使 Lambertian LE!D所射出之光線修正成bat_wing type之形式，如第 二圖（A)所示係為Lambertian type _未使用該光學透鏡之模 擬光能量分侧，而第二圖⑻職使用該絲透鏡後之結果、， 證明該it狀結構設計有齡出光柄性之 別置於光源趙上，非-模組形式，將增加絲之複雜度， 決綜上所述之問題。 爰引此構想並將其改良，彰顯其優點且更具產業细性，同時解 【發明内容】 本發明之目駐要係提供—種導光舰it件及其 模組，其中該Μ杏撼|θ 1 ..The direct-lit backlight module is known as a CCFL & LED, and because the LED driving speed is fast, the LCD color is not too separate, and the image sticking can be avoided, and the color can be developed without using a color light-emitting film. Efficacy, the use of light increased by more than 2 times, so LED backlight module is one of the technologies expected by the market. However, when LED is used as the light source, it often encounters the problem of uneven diffusion. In order to increase the average brightness, the number of sheets of optical film is often increased. However, in order to increase the brightness, it is necessary to add multiple systems. In addition, the diffuser acts only to scatter the light that passes through it. The effect of improving the average brightness is 13⁄4 and some backlight modules deliberately stretch the gap between the light source and the diffuser to expand Each light source enters a range of diffusion, resulting in an increase in the thickness of the backlight module. 5 200921149 In order to achieve the goals of thinning and light weight, the choice of light source, the arrangement of microstructures and the design of microstructures, and the optical efficiency of optical films, we should consider how to design the optimal structure of each optical component and integrate the optical components. One component is imperative. In order to reduce the cost and improve the uniformity and brightness of the backlight module, a new type of optical diffusion-enhanced plate is widely designed. As disclosed in the prior art, optical coupling such as Fresnel lens is designed on the light guide plate. The lens is such that the light guiding material has the effect of collecting light, and the process of the grain is difficult, which is not ideal. Another conventional technique is to design an optical lens, as shown in the side view of the first figure (A) and the perspective view of the first figure (β), which is provided with a curved gap (for the uniformity of the & a dome-shaped air gap, and the optical lens is placed on each of the LED light source bodies, and the curved voids are provided with a cover (10) therein, and the function of the lens can correct the light emitted by the Lambertian LE!D into The form of the bat_wing type, as shown in the second figure (A), is the Lambertian type _ the simulated light energy side of the optical lens is not used, and the result of using the wire lens in the second figure (8) proves that it is The structural design is based on the light-handling property of the light source Zhao, the non-module form, will increase the complexity of the wire, and the problems mentioned above. Introducing this idea and improving it, highlighting its advantages and more industrial fineness, and at the same time solving the contents of the invention. The object of the present invention is to provide a light guide ship and its module, wherein the apricot |θ 1 ..
應用之光源 一入光面及一出光面，該入光面 係呈一圓弧狀之凹穴結構，散射 200921149 單元之設置係對應光源之數目及位置而取決之。另外，出光面係 牛-構㈣部呈—弧狀哺，並於該出絲表有呈幾何 圖形斷面之條狀微結構，另外，於該元件之入光面表面設有三角 '之柱狀反健細面體之反_結構或-表面反㈣，此元件 結構設計之目的，有如下所述之功效： 其一，本創作係為針對點光源之直下式背光模組設計之元 2習知右將LED等點光源直接導入f光系統，由於㈣發光有 其H散歧，使得背光模組的出光形成不均勻之分佈，為 解^此㈤題’本創作之入光面係對應於每一點光源而設置一散 射早疋，概射單元之作關將光肋散至各財向，改善出光 之均勻性，同時，騎加亮度及更佳之均皱，於人光面表面設 有二角形之柱狀反健或四面體之反射體結構，亦或於入光面表 面5又一表面反射層。 其二’該光源之位置設置，係考慮使其達均勻面光源形態， 故其麵位置及顆數係採對稱式排列，以達其最適當之均 距離。 其三’-般背光模組之光線在經由擴散板射出後其光的指向 性很差’有部分光源浪費’而無法有效，須藉由稜鏡片來修 正光的方向’因此，出光面係呈—朝結構體内部凹陷之圓弧結構， 並於其上設有角錐形或圓弧斷面之條狀聚光微結構，藉由該微結 構内部之折射與反敎光線躲，並且妓蚊圓弧凹槽=構= 達二次收束光線之作用，以提高正面輝度。 ° ’、 200921149 現行直下式背光模組，其光源主體係置於背光模組之下，須 於光源上方搭配擴散板及稜鏡片來提升出光之均勻度及亮产，押 擴散板之穿透率不高，而稜鏡片單價又偏高，同時為了達到高亮 度之要求，光源之增設反造成耗電量及散熱的問題。因此，從實 用及經濟面作考量，本發明之設計係_元件之絲結構改良， 應用單—元件_職之目的，設計或製程皆減少其_度，實 為替直下式背光模組之改良開啟一嶄新之思考空間。 為使貴審查委員能更進一步了解本發明為達目的所採取之 技術、手段及功效，鱗下狀實施顺配合圖示詳細說明如后， 當可具體瞭解本發明之目的、特徵與優點。 【實施方式】 如第三圖所示，本發明係為一種導光擴散元件（1)，該元件包 括-出光面（1 1)、及—人光面（1 2)，該人光面（1 2)係具有複 數個散射單元（1 2 1)，且其特徵係相對於人光面（:1 2)表面呈一 圓弧狀凹穴結構，其中： 該導光擴散元件（1)，其材料係為可透光材質，可為聚乙烯 (PE’polyethylene)、聚碳酸酯(pc，p〇lyCarb〇nate)、聚曱基丙烯酸甲 醋(PMMA)、聚苯乙烯(ps，p〇iystyre岭聚丙稀酸醋(㈣叫㈣、 聚對苯二甲酸乙二酯(PET，p〇lyethyleneterephthala⑹環稀烴共聚 物(mCOC，Metallocene Cyclic. Olefin Copolymer)之一或其組合者。 如第二及第四騎示’上述元件之人光面2)表面係設有複 數個呈圓弧狀凹穴結構之舰單元(1 2 υ，其側為使光源擴散 200921149 之功能者；另外，為使光線在出光面（1 1}減少其全反射的發生， 以提升出光売度，同時均勻度亦得以提升，因此於入光面（1 2) 表面設有複油三肖狀絲反_(1 2 2)，如紅圖⑷及⑻ 所示，係鱗光槪元件（1)之人絲（1 2)平祕X軸或γ車由方 向设置该結構體之實施樣態，除單一方向排列設置外，亦可同時 於兩軸向交錯陣列排設；再者，另—如第六圖(A)及(B)所呈現之實 施例，係於入光面（1 2)設置複數個四面體之反射體（1 2 3)，其 作用及功效亦如同三角雜狀反繼（1 2 2)，湖方式係朝乂轴 及Y軸方向，單一或雙軸向陣列設置；如第七圖之樣態，亦可於 入光面（1 2)之表面設一表面反射層2 4)，反射自出光面工） 全反射之光線，以提昇亮度。 則述之導光擴散元件（1)，其中該元件之出光面（1 1)可為平 面，更可為一朝結構體内部凹陷，且其橫截面呈弧狀構造之凹槽， 其設計用意俾利出射光線達一匯聚之功效。 另外’請參考第八圖、第九圖所示，該出光面（1 1)於其上設 有條狀排列之聚光微結構(1 !丨），該結構之斷面係呈角錐形或圓 弧形，俾使出射光線藉由結構内部之反射、折射使光線集中，增 加光源之使用率。 請參考第十圖所示，上述之一種導光擴散元件⑴，其應用係 為-種導光擴散元件及其助之光雜組，該光賴組包括： 一導光擴散元件⑴、一光源⑵、-電路基板(3)以及-反 射層⑷’其中該電路基板(3)具有複數個容置槽（3 1)，光源(2) 9 200921149 係嵌置於該容置槽（3 1)内，而反射層（4)設置於電路基板（3)表 面上，用以反射導光擴散元件（1)損失之光線，提高光源之利用， 再者，該光源（2)係為發光二極體(LED)或其他形式之點光源，其 設置可為陣列式排列，亦或考慮使其達均勻面光源形態，故其擺 放位置及顆數係採對稱式排列，以達其最適當之均勻排列距離， 請參閱第十一圖所示之排列示意圖及第十二圖所示之元件組合樣 態示意圖’以瞭解其應用。 上述之一種使用導光擴散元件之光源模組，其中，該導光擴 散元件（1 )之材料係為透光材質，包括：聚乙烯(PE，p〇lyethylene)、 聚碳酸酯(PC, polycarbonate)、聚甲基丙烯酸曱酯(PMMa)、聚苯乙 烯(PS，p〇lystyrene；|、聚丙烯酸酯(p〇lyacryiate)、聚對苯二甲酸乙二 酯（PET，P〇lyethylene terephthalate)、環烯烴共聚物The light source of the application has a light-incident surface and a light-emitting surface, and the light-incident surface has an arc-shaped concave structure, and the arrangement of the scattering of the 200921149 unit depends on the number and position of the light source. In addition, the light-emitting surface is a cow-shaped (four) portion which is fed in an arc shape, and has a strip-shaped microstructure having a geometric cross section on the wire surface, and a triangular column is provided on the surface of the light incident surface of the element. The anti-health of the anti-health fine-faced body or the surface anti-(four), the purpose of the structural design of the element has the following effects: First, the creation is a design for the direct-lit backlight module for point light source. Knowing the right point LED light source directly into the f-light system, because (4) the light has its H dispersion, so that the light output of the backlight module is unevenly distributed, so that the (5) question 'the light surface of the creation corresponds to A scattering light is set for each light source, and the light-emitting ribs are scattered to the respective financial directions to improve the uniformity of the light. At the same time, the riding brightness and the better wrinkles are provided on the surface of the human surface. An angular columnar anti-health or tetrahedral reflector structure, or a surface reflective layer on the incident surface 5. The position of the light source is considered to be such that it reaches the uniform surface light source form, so that the surface position and the number of the surface are symmetrically arranged to achieve the most suitable average distance. The light of the three '----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- - a circular arc structure recessed toward the inside of the structure, and a strip-shaped concentrating microstructure having a pyramidal or circular cross section thereon, by which the refraction of the inside of the microstructure and the ray light are hidden, and the mosquito coil Arc groove = structure = up to the secondary converging light to improve the frontal brightness. ° ', 200921149 The current direct-lit backlight module, the main system of the light source is placed under the backlight module, and the diffusion plate and the cymbal must be used above the light source to enhance the uniformity and brightness of the light, and the penetration rate of the diffusion plate It is not high, and the unit price of the cymbal is high. At the same time, in order to achieve the requirement of high brightness, the addition of the light source causes the problem of power consumption and heat dissipation. Therefore, considering the practical and economic aspects, the design of the present invention is improved by the wire structure of the component, and the purpose of the application of the single component is reduced, and the design or the process is reduced by _ degrees, which is an improvement for the direct backlight module. A new space for thinking. In order to provide a more detailed understanding of the present invention, the techniques, means, and advantages of the present invention will be described in detail. [Embodiment] As shown in the third figure, the present invention is a light guiding diffusion element (1) comprising a light-emitting surface (11) and a human light surface (12), the human light surface ( 1 2) having a plurality of scattering units (1 2 1), and having a feature of a circular arc-shaped cavity structure with respect to a surface of the human light surface (: 12), wherein: the light guiding diffusion element (1), The material is permeable material, which can be polyethylene (PE'polyethylene), polycarbonate (pc, p〇lyCarb〇nate), polymethyl methacrylate (PMMA), polystyrene (ps, p〇) Iystyre Ridge polyacrylic acid vinegar ((4) is called (4), polyethylene terephthalate (PET, p〇lyethyleneterephthala (6) ring copolymer (mCOC, Metallocene Cyclic. Olefin Copolymer) or a combination thereof. The fourth rider has a plurality of ship units (1 2 υ, the side of which is a function of diffusing the light source 200921149; In the light-emitting surface (1 1} reduces the occurrence of total reflection to enhance the light intensity, and the uniformity is also improved, so the light is incident The surface (1 2) is provided with a re-oil three-dimensional filament anti-(1 2 2), as shown in the red figures (4) and (8), the scaly aperture element (1) of the human filament (1 2) flat secret X-axis Or the gamma car is arranged in the direction of the configuration of the structure, except that it is arranged in a single direction, or can be arranged in a two-axis staggered array at the same time; further, as in the sixth figure (A) and (B) In the embodiment, a plurality of tetrahedron reflectors (1 2 3) are arranged on the light-incident surface (12), and the function and effect are also like triangular polymorphism (1 2 2), and the lake mode is 乂Axis and Y-axis direction, single or biaxial array arrangement; as shown in the seventh figure, a surface reflection layer can also be provided on the surface of the light-incident surface (12), and the reflection is self-extracting) Reflecting light to enhance the brightness. The light-diffusing element (1), wherein the light-emitting surface (11) of the element may be a flat surface, or may be recessed inside the structural body, and its cross section is curved. The groove of the structure is designed to facilitate the emission of light to achieve a convergence effect. In addition, please refer to the eighth and ninth figures, the light-emitting surface (1 1) is arranged in a strip shape. Concentrating microstructure (1 !丨), the section of the structure is pyramidal or arc-shaped, so that the emitted light is concentrated by reflection and refraction inside the structure, increasing the utilization rate of the light source. As shown in the figure, the above-mentioned light-diffusing diffusing element (1) is applied as a light-diffusing diffusing element and its auxiliary optical group, and the light-receiving group comprises: a light guiding diffusing element (1), a light source (2), a circuit a substrate (3) and a reflective layer (4), wherein the circuit substrate (3) has a plurality of accommodating grooves (3 1), and the light source (2) 9 200921149 is embedded in the accommodating groove (31), and the reflection The layer (4) is disposed on the surface of the circuit substrate (3) for reflecting the light lost by the light guiding diffusing element (1), improving the utilization of the light source, and further, the light source (2) is a light emitting diode (LED) Or other forms of point light source, the arrangement may be arranged in an array, or it may be considered to be in the form of a uniform surface light source, so that the position and the number of the positions are arranged symmetrically to achieve the most appropriate uniform arrangement distance. Please refer to the arrangement diagram shown in Figure 11 and the component combination shown in Figure 12. Schematic 'for its application. The light source module using the light guiding diffusion element, wherein the material of the light guiding diffusing element (1) is a light transmissive material, including: polyethylene (PE, p〇lyethylene), polycarbonate (PC, polycarbonate) ), polymethyl methacrylate (PMMa), polystyrene (PS, p〇lystyrene; |, polyacrylate (p〇lyacryiate), polyethylene terephthalate (PET), P〇lyethylene terephthalate, Cyclic olefin copolymer
Metallocene Cyclic. Olefin Copolymer)之一或其組合者。 另外，該導光擴散元件⑴，具一入光面（1 2)以及一出光面 (1 1) ’該入光面（1 2)如第十三圖所示可為一平面，或如第十四 圖之實施例所示，因使用不_型之led或為達光學目的而設有 複數個散射單元（1 2 D，該特徵係相對於表面呈-圓弧狀凹穴結 構，俾使光源藉由該特徵之作用，達分散光源至各個角度射出， 以提=柄勻性；同時’該散射單元(12 m對應於每一個光 源而設置’其相對位置為：光源⑵置於下，散射單元(12 υ設 於光源⑵之上，其圓弧狀之凹穴結構洽可覆蓋住光源體，其弧狀 之曲率係取決於光㈣之划、及光學考量，料，於人光面 200921149 表面亦可設置三角形之柱狀反射體（1 2 2)，如第十五圖所示；或 四面體之反射體q 2 3)，其設置方式係於入光面（1 2)平面之X 轴及Y軸方向，單一軸向排設或雙軸陣列式排設，該表面之結構 设計可增加導光擴散元件（1)之出光輝度及均句度，再者，請參考 第十六圖所示’亦可於入光面（1 2)表面設一表面反射層（1 2 4)’用以反射自出光面（1 1)全反射之光線以提昇亮度。 前述之光源模組，其中，該導光擴散元件（i )之出光面（i丄）， =第十七®所示可為平面，或該出光面更可設計為，結構體内 ^且其橫截面為-弧狀之凹槽，光線由上述之散射單元(1 =1)擴散其點光源後，於出光面（1 U射出之同時，藉由弧狀凹 日之作用’使出射光線朝結構體中心匯聚，提升平均出光輝产。 二=;=散元件⑴之出光面(11)上_ 俾使雜構之_係呈角錐形或圓孤形， 先源之之槪射、峨峨卜増加 上述為本發雜佳實_之詳細說明 本創作’本發明之所有範圍細τ述專蝴=但_來限制 實施例與近似結構， 200921149 【圖式簡單說明】 第-圖（A)係為-習知技術之側視圖。 第-圖（B)係為-習知技術之上視圖。 第一圖（A)係為未使用習知光學透鏡之光能量分佈圖。 第一圖（B)係為使用習知光學透鏡之光能量分佈圖。 第二圖係為本創作第一實施例之示意圖。 第四圖係為本創作第一實施例之立體圖。 第五圖（A)係為本創作之第二實施例圖。 第五圖（B)係為本創作之第二實施例之側視圖。 第六圖（A)係為本創作第三實施例之示意圖。 第六圖（B)係為本創作第三實施例之局部放大圖。 第七圖係為本創作第四實施例之示意圖。 第八圖係為本創作第五實施例之示意圖。 第九圖係為本創作第六實施例之示意圖。。 第十圖係為本創作第七實施例之示意圖。 第十一圖係為本創作排列示意圖。 第十一圖係為本創作組合示意圖。 第十三圖係為本創作第八實施例之示意圖。 第十四圖係為本創作第七實施例之功能示意圖。 第十五圖係為本創作第九實施例之示意圖。 第十六圖係為本創作第十實施例之示意圖。 第十七圖係為本創作第十一實施例之示意圖。 12 1 200921149 【主要元件符號說明】 導光擴散元件 出光面 12 111 入光面 聚光擴散元件 散射單元 121 三角形之柱狀反射體 122 12 3 12 4 2 3 3 1 4 四面體之反射體 表面反射層 光源 電路基板 容置槽 反射層 13One of or a combination of Metallocene Cyclic. Olefin Copolymer). In addition, the light guiding diffusing element (1) has a light incident surface (1 2) and a light exiting surface (1 1). The light incident surface (1 2) may be a plane as shown in FIG. As shown in the fourteenth embodiment, a plurality of scattering units (1 2 D are provided for the purpose of optical use or for optical purposes, and the feature is a circular arc-shaped cavity structure with respect to the surface. By the action of the feature, the light source reaches the dispersed light source to emit at various angles to improve the shank uniformity; and at the same time, the scattering unit (12 m corresponding to each light source is set to have a relative position: the light source (2) is placed under, The scattering unit (12 is disposed above the light source (2), and the arc-shaped recess structure can cover the light source body, and the curvature of the arc depends on the light (4) and optical considerations, and the material is smooth. 200921149 The surface may also be provided with a triangular columnar reflector (1 2 2), as shown in the fifteenth figure; or a tetrahedral reflector q 2 3), which is arranged in the plane of the entrance surface (1 2) X-axis and Y-axis directions, single axial arrangement or biaxial array arrangement, the surface structure of the surface can increase the light guiding diffusion element (1) The brightness and uniformity of the light, in addition, please refer to the figure shown in Figure 16 'You can also set a surface reflection layer (1 2 4) on the surface of the light-incident surface (1 2) to reflect the self-lighting The surface (1 1) totally reflects light to enhance the brightness. The light source module, wherein the light-emitting surface of the light-diffusing element (i) (i丄), = the seventeenth® can be a plane, or the The light-emitting surface can be designed as a groove in the structure body and having a cross-section of an arc-shaped groove. After the light is diffused by the scattering unit (1 =1), the light source is emitted on the light-emitting surface (1 U is emitted simultaneously. By the action of the arc-shaped concave sun, the outgoing light is concentrated toward the center of the structure, and the average light output is increased. 2=;=The light-emitting surface of the element (1) (11) _ 俾 杂 杂 杂 呈 角 或 或Round orphan, the first source of the 槪, 峨峨 増 増 上述 上述 上述 上述 上述 上述 详细 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本 本200921149 [Simple description of the drawing] The first figure (A) is a side view of the prior art. The first figure (B) is a top view of the prior art. (A) is a light energy distribution diagram of a conventional optical lens. The first figure (B) is a light energy distribution diagram using a conventional optical lens. The second figure is a schematic view of the first embodiment of the creation. The fourth drawing is a perspective view of the first embodiment of the creation. The fifth drawing (A) is a second embodiment of the creation. The fifth drawing (B) is a side view of the second embodiment of the creation. Fig. 6(A) is a schematic view showing a third embodiment of the present invention. Fig. 6(B) is a partially enlarged view of the third embodiment of the present invention. The eighth drawing is a schematic view of the fifth embodiment of the present creation. The ninth drawing is a schematic view of the sixth embodiment of the present creation. . The tenth figure is a schematic view of the seventh embodiment of the present creation. The eleventh figure is a schematic diagram of the creation arrangement. The eleventh figure is a schematic diagram of the creation combination. The thirteenth drawing is a schematic view of the eighth embodiment of the present creation. The fourteenth figure is a functional diagram of the seventh embodiment of the present creation. The fifteenth figure is a schematic view of the ninth embodiment of the creation. Fig. 16 is a schematic view showing the tenth embodiment of the creation. Figure 17 is a schematic view showing the eleventh embodiment of the present invention. 12 1 200921149 [Description of main component symbols] Light-emitting surface of the light-diffusing diffusing element 12 111 Light-integrating diffusing element scattering unit 121 Triangular columnar reflector 122 12 3 12 4 2 3 3 1 4 Reflector surface reflection of tetrahedron Layer light source circuit substrate receiving groove reflective layer 13