年十月 曰修正頁 九、發明說明： 【發明所屬之技術領域】 •本發明涉及一種背光系統和用於該背光系統的反光罩，特別係關 於一種用於給液晶顯示器面板提供照明的背光系統。 【先前技術】 由於液晶顯示器面板中的液晶本身不具有發光特性，因而，爲達 到顯示效果’需要給液晶顯示器面板提供一面光源裝置，如背光系統， 其功能在於向液晶顯示器面板提供輝度充分而且分佈均勻的面光源。 請參閱第一圖，一種先前技術的背光系統10主要由兩個點狀光源 u、導光板12、反射片13、擴散片14和兩個稜鏡片15組成。該點狀 光源11爲發光二極體(Light Emitting Diode, LED)。該導光板12包 括入光面121、出光面122和底面123。該點狀光源11設置於該導光 板12的入光面121 —側，該兩個稜鏡片15、擴散片14、導光板12和 反射片13依次層疊設置。該點狀光源u發出的光線經入光面121進 入該導光板12，該導光板12導引光線從出光面122出射。反射片13 將由導光板12的底面123出射的光線再次反射入該導光板12内，提 向光線的綱率，散片14的作用爲將人射到其内的光線散射而使顯 =面板關和化。魏以5也鶴抑，其作岐對光線產生會 作用，使光線的方向盡可能的朝垂直於導光板12出光面122的方 出射，以提高背光系統10的出光輝度。 再請參照第二圖，作爲點狀光源u的發光二極 的部分入光面121接收的光線li與該 η垂直先線1^射入導光板12内後繼續傳播，並由正對點狀光 U的部分出絲122丨射嗜, 狀娜狀尤源 121接收齡州」 兩個點狀絲11之間的部分入光面 絲121成—定銳㈣紐以，入光 2處的为佈較少’從而使得對應兩個點狀光源^之間的部奴 圍出「光 形成一光線輝度較低的暗區124(圖中虛線所 圍_，該暗謂的存在繼個 =虛線所 I317fM年十月 【發明内容】 以下，將以實施例說明一種背光系統，以及—種用於該背光系統 . 的反光罩。 爲實現上述内容’提供—種背光系統，其包括複數光源、一反光 罩和導光板。該導光板包括人光面、連接於該人光面的出光面和相 對於，出光面的底面’絲源相對該人光面設置。該反光罩具有複數 反射單元，該魏反射單元分職容該複數絲，各反料元具有兩 個相對設置的反射面。該兩減射面無人光面摘且該兩個反射面 的截面形狀在一極座標中由如下方程限定： > |£>)sin—)=f^ [ρ(ψ) ~p〇{cos(0/2)/[cos(^?-θ)/2])2 ’其中’炉表示極座標中的角 度，0表不光源輸出光線的發散角，ρ爲極座標中的極軸。 以及，提供一種反光罩，該反光罩具有兩個相對設置的反射面， 該兩個反射面的截面形狀在一極座標中由如下方程限定： ’其中，ρ表示極座標中的角度， ^ιθ2ρ{φ)^ϊη{φ~θ)ά{φ-θ')= f —\__άθ Λ cos (^) Ρ(ψ) =P〇{c〇s(6»/2)/[cos(^-6>)/2]}2October 曰 曰 、 、 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光. [Prior Art] Since the liquid crystal in the liquid crystal display panel itself does not have the light-emitting 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 system, which functions to provide sufficient brightness and distribution to the liquid crystal display panel. A uniform surface source. Referring to the first figure, a prior art backlight system 10 is mainly composed of two point light sources u, a light guide plate 12, a reflection sheet 13, a diffusion sheet 14, and two cymbals 15. The point light source 11 is a Light Emitting Diode (LED). The light guide plate 12 includes a light incident surface 121, a light exit surface 122, and a bottom surface 123. The point light source 11 is disposed on the light incident surface 121 side of the light guide plate 12. The two dam pieces 15, the diffusion sheet 14, the light guide plate 12, and the reflection sheet 13 are laminated in this order. The light emitted from the point light source u enters the light guide plate 12 through the light incident surface 121, and the light guide plate 12 guides the light to exit from the light exit surface 122. The reflection sheet 13 reflects the light emitted from the bottom surface 123 of the light guide plate 12 into the light guide plate 12, and lifts the light to the plane. The effect of the sheet 14 is to scatter the light that the person shoots into the panel. And. Wei also suppresses the light, and its action acts on the light, so that the direction of the light is emitted as far as possible perpendicular to the light-emitting surface 122 of the light guide plate 12 to improve the light-emitting brightness of the backlight system 10. Referring to the second figure, the light ray li received by the partial light incident surface 121 of the light-emitting diode of the point light source u and the η vertical line 1^ are incident into the light guide plate 12, and then continue to propagate, and are aligned by dots. Part of the output U of the light U is irritating, and the shape of the shape of the genus 121 receives the state of the state. The portion between the two dotted wires 11 is turned into a sharp (four) button, and the light entering the light is The cloth is less 'so that the slave between the two point light sources ^ surrounds the light to form a dark area 124 with a lower radiance (the dotted line is surrounded by _, the existence of the dark state is followed by the dotted line I317fM October [Invention] In the following, a backlight system, and a reflector for the backlight system, will be described by way of example. In order to achieve the above, a backlight system is provided, which includes a plurality of light sources and a reflective a cover and a light guide plate, the light guide plate comprises a human light surface, a light exit surface connected to the light surface of the person, and a bottom surface of the light exit surface is disposed opposite to the light surface of the light source. The reflector has a plurality of reflection units, the Wei The reflecting unit divides the plurality of wires, and each of the opposing elements has two relative The reflecting surface of the two reducing surfaces is unmanned and the cross-sectional shape of the two reflecting surfaces is defined by the following equation in one pole coordinate: >|£>)sin_)=f^ [ρ(ψ) ~p〇{cos(0/2)/[cos(^?-θ)/2])2 'where 'the furnace represents the angle in the polar coordinates, 0 represents the divergence angle of the light output, and ρ is the pole in the polar coordinates And, a reflector is provided, the reflector has two oppositely disposed reflecting surfaces, and the sectional shape of the two reflecting surfaces is defined by the following equation in one pole coordinate: 'where ρ represents an angle in the polar coordinate, ^ιθ2ρ {φ)^ϊη{φ~θ)ά{φ-θ')= f —\__άθ Λ cos (^) Ρ(ψ) =P〇{c〇s(6»/2)/[cos(^- 6>)/2]}2
Θ表示光源輸出光線的發散角，p爲極座標中的極軸。 與先前技術相比，因本實施例的背光系統採用反光罩的反射面的 截面形狀由特定方程限定，該形狀的反射面可以實現對導光板入光面 的均勻照明’從而使付該背光系統的發光輝度的均勻性大大提高。 【實施方式】 ° 請參閲第三圖，本發明第一實施例的背光系統包括一反光罩 41、複數光源42、一導光板50、一反射片43和一光學膜片44。該光 源42收容在該反光罩41内，且該光源42的發光面421正對該導光板 50的入光面51設置。該光學膜片44、導光板50和反射片43依次層 疊設置。 年十月 曰修正頁 單元具單元’各反射 形成，各光源42即_該收容酬::1。和412之間 ϋ座標中由—牿宕方㈣★分的反射面41卜412的截面形狀在 截面形狀的及朵罢w疋照該特定方程限定反射面41卜412 明，從而接-i罩以將光源42發出的光線對入光面51均勻，昭 月，從而k向整個背光系統3〇發光輝度的均勾性。 ΊΊ‘、、、 下面結合第四圖，對該反光草41的反射 的設計過觀其她效紐行_。 的截面域 射面ΪΓ=421下端點爲極座標原點的極座標中，反光罩41的反 面仞、仙之^處;;42的發光面仞位於反射 爲㈣兩條光後1下端點發出的發散角 有： ’、 ”· 第四圖所示。根據第四圖的幾何關係， 且有 Χ = φ~θ 念=_/2) ⑴ ⑵ 在極座標中’反鮮41的反射面4U、412的方程可以寫成： 咖= 姑_/2)—(㈣/2]}2 ⑶ 其中角度/和0的範圍如下： ⑷ 〇<θ<θ^. 根據光额邊緣光_的距誠正比的邊緣光縣理，單位輝度 的光源在0方向的發射光強度爲： /〇(θ) = ρ(<φΐη〇) ⑸ 在範圍内，總功率户可寫爲： ⑹ JLp⑽sin⑺办 曰修正頁 九五年十月 厂(的爲希望得到的光強分佈，對於0e[o，巧範圍内，尸又可以寫成： Ρ=ζι°φ)άθ (7) 根據能量守恒定律，有： in P(<P) sin(r)dr =ζΐ° {&)άθ (8) 根據方程（1)、（3)和（8)，用於産生光強分佈/。⑹的反光罩反射面 的截面形狀可以被確定。 背光系統30中需要在入光面51上産生均勻照度，光強分佈應該 滿足： (9) cos2{&) 根據(9) ’可以得到確定反光罩反射面的截面形狀的方程如下： Ιθ2Ρ{φ)ΒΪη{φ-θ)ά{φ-θ)= f —L-/>(的=p。{cos(0 / 2) /[cos〇 - 0) / 2] }2 ύθ (10) 再請一起參照第五圖和第六圖，該導光板50還包括連接於該入光 面51的出光面53和相對於該出光面53的底面52。該導光板50的入光面 51設置有複數微結構511 ’本實施例中，該微結構511爲一維菲涅爾透 鏡，其以正對光源42的對稱軸對稱分佈。該微結構511包括靠近該對稱 軸的第一平面512和遠離該對稱轴的第二平面513，該第一平面512垂直 於入光面51所在平面514，該第二平面513和平面514形成一銳角α，該 銳角α自正對光源42的部位向遠離該部位的方向逐漸增大。該導光板 50的底面52分佈複數散射結構521，本實施例中，該散射結構521爲V形 凹槽。 該光源42可爲發光二極體。該反射面411和412可以通過鑛銀或 鋁等金屬膜提高反射率。該光學膜片44可以是擴散片，或者稜鏡片， 也可以是擴散片與稜鏡片的組合。 光源42發出的一部分光線L5直接投射在該微結構511上，並經 該微結構511作用後以垂直於該入光面51所在平面514的方向進入該 導光板50，另一部分光線L6投射在反射面411和412後被反射到該微 結構511上，並經該微結構511作用後以垂直於入光面51所在平面514Θ denotes the divergence angle of the light output from the light source, and p is the polar axis in the polar coordinates. Compared with the prior art, the cross-sectional shape of the reflective surface of the backlight system using the reflector of the present embodiment is defined by a specific equation, and the reflective surface of the shape can achieve uniform illumination of the light-incident surface of the light guide plate, thereby making the backlight system The uniformity of the luminescent brightness is greatly improved. [Embodiment] Referring to a third embodiment, a backlight system according to a first embodiment of the present invention includes a reflector 41, a plurality of light sources 42, a light guide plate 50, a reflection sheet 43, and an optical film 44. The light source 42 is housed in the reflector 41, and the light-emitting surface 421 of the light source 42 is disposed on the light-incident surface 51 of the light guide plate 50. The optical film 44, the light guide plate 50, and the reflection sheet 43 are sequentially stacked. October 曰 Correction page The unit unit 'reflection is formed, and each light source 42 is _ the receiving fee: 1:. Between the coordinates of 412 and 412, the cross-sectional shape of the reflecting surface 41 412 of the 牿宕 (4) 分 is in the shape of the cross-section, and the reflecting surface 41 412 is defined by the specific equation, thereby connecting the il-i cover The light emitted from the light source 42 is evenly incident on the light incident surface 51, so that k is uniform to the entire backlight system 3 . ΊΊ ‘,,, and below, in conjunction with the fourth figure, the design of the reflection of the reflective grass 41 is over. The cross-section of the cross-section is ΪΓ=421, the end point is the polar coordinate of the origin of the polar coordinate, the opposite surface of the reflector 41 is 仞, 仙^;; 42 the illuminating surface 仞 is located at the end of the reflection of the (four) two light The angles are: ', ′·· The fourth figure is shown. According to the geometric relationship of the fourth figure, and there are Χ = φ~θ 念=_/2) (1) (2) In the polar coordinates, the reflection surface of the anti-fresh 41 is 4U, 412 The equation can be written as: 咖 = 姑 _/2) - ((4)/2]} 2 (3) where the range of angles / and 0 is as follows: (4) 〇 < θ < θ ^. According to the edge of the light edge _ the distance is directly proportional to the edge Guangxian County, the intensity of the emitted light of the unit luminance in the 0 direction is: /〇(θ) = ρ(<φΐη〇) (5) Within the range, the total power household can be written as: (6) JLp(10)sin(7) In October of the year (for the desired light intensity distribution, for 0e [o, in the range, the body can be written as: Ρ = ζι ° φ) ά θ (7) According to the law of conservation of energy, there are: in P (< P) sin(r)dr =ζΐ° {&)άθ (8) According to equations (1), (3) and (8), the cross-sectional shape of the reflective surface of the reflector used to generate the light intensity distribution / (6) can be It is determined In the backlight system 30, it is necessary to generate uniform illumination on the light incident surface 51, and the light intensity distribution should satisfy: (9) cos2{&) According to (9) ', the equation for determining the sectional shape of the reflective surface of the reflector can be obtained as follows: Ιθ2Ρ{ Φ)ΒΪη{φ-θ)ά{φ-θ)= f —L-/>(=p.{cos(0 / 2) /[cos〇- 0) / 2] }2 ύθ (10) Referring to the fifth and sixth figures together, the light guide plate 50 further includes a light exit surface 53 connected to the light incident surface 51 and a bottom surface 52 opposite to the light exit surface 53. The light incident surface 51 of the light guide plate 50 is disposed. There are complex microstructures 511 'in this embodiment, the microstructures 511 are one-dimensional Fresnel lenses that are symmetrically distributed symmetrically to the axis of symmetry of the light source 42. The microstructures 511 include a first plane 512 adjacent the axis of symmetry and A second plane 513 away from the axis of symmetry, the first plane 512 is perpendicular to the plane 514 of the incident surface 51, and the second plane 513 and the plane 514 form an acute angle α, which is away from the portion facing the light source 42 The direction of the portion is gradually increased. The bottom surface 52 of the light guide plate 50 is distributed with a plurality of scattering structures 521. In the embodiment, the scattering structure 521 is a V-shaped groove. The light source 42 may be a light emitting diode. The reflecting surfaces 411 and 412 may increase the reflectivity by a metal film such as mineral silver or aluminum. The optical film 44 may be a diffusion sheet, or a silicon sheet, or may be a diffusion sheet and a prism. a combination of the lens. A part of the light L5 emitted by the light source 42 is directly projected on the microstructure 511, and passes through the microstructure 511 to enter the light guide plate 50 in a direction perpendicular to the plane 514 of the light incident surface 51. L6 is projected onto the microstructure 511 after being projected on the reflective surfaces 411 and 412, and is applied to the plane 514 perpendicular to the plane of the incident surface 51 via the microstructure 511.
曰修正頁 的方向進入該導光板50。 因該背光系統30採用的反光罩41的反射面411、412可以實現對 ^光面51的均勻照明，配合入光面51的微結構511使光源42發出的 光線以垂直於入光面51所在平面514的方向進入該導光板50，經入光 ，51進入導光板50的光線方向基本相同，且分佈較爲均勻，從而使 得該背光系統30的發光輝度的均勻性大大提高。 請參閱第七圖’本發明第二實施例的背光系統6〇同上述的背光系 統30基本相同，其主要不同在於：導光板8〇的入光面81上的微結構 811在平行於出光面的方向上的截面爲一正弦函數曲線。 本發明的背光系統還可以有其他實施例，例如： 本發明背光系統中導光板入光面的微結構爲平面或¥形凹槽。 以直接鍍在導光板底面上的反射膜代替反射片。 综上所述，本發明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，舉凡熟悉本案技藝之人 士，在援依本案發明精神所作之等效修飾或變化，皆應包含於以下之 申請專利範圍内。 ' 【圖式簡單說明】 第一圖係一種先前技術的背光系統的立體分解示意圖。 第二圖係第一圖所示背光系統的光路示意圖。 第二圖係本發明第一實施例的背光系統的立體分解示意圖。 IV-IV方向的截面示意圖。 第五圖係該第一實施例的背光系統的光路示意圖。 第六圖係第五圖中VI部分的放大示意圖。 第七圖係本發明第二實施例的背光系統的部分平面示意圖。 【主要元件符號說明】 背光系統 反射面 發光面 30 > 60 反光罩411 >412 光源 421 導光板 4142 50、80 曰修正頁 入光面 51 > 81 底面 52 出光面 53 散射結構 521 反射片 43 光學膜片 44 微結構 511 、 811 第一平面 512 第二平面 513The direction of the correction page enters the light guide plate 50. The reflective surfaces 411 and 412 of the reflector 41 used in the backlight system 30 can achieve uniform illumination of the surface 51. The microstructure 511 of the light incident surface 51 allows the light emitted by the light source 42 to be perpendicular to the light incident surface 51. The direction of the plane 514 enters the light guide plate 50, and the direction of the light entering the light guide plate 50 through the light entering is substantially the same, and the distribution is relatively uniform, so that the uniformity of the luminance of the backlight system 30 is greatly improved. Referring to the seventh figure, the backlight system 6 of the second embodiment of the present invention is substantially the same as the backlight system 30 described above, and the main difference is that the microstructure 811 on the light incident surface 81 of the light guide plate 8 is parallel to the light exit surface. The cross section in the direction is a sinusoidal function curve. The backlight system of the present invention may have other embodiments. For example, the microstructure of the light incident surface of the light guide plate in the backlight system of the present invention is a planar or a ¥-shaped groove. Instead of the reflective sheet, a reflective film directly plated on the bottom surface of the light guide plate is used. In summary, the present invention conforms to the requirements of the invention patent, and proposes a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a perspective exploded view of a prior art backlight system. The second figure is a schematic diagram of the optical path of the backlight system shown in the first figure. The second figure is a perspective exploded view of the backlight system of the first embodiment of the present invention. Schematic diagram of the cross section in the IV-IV direction. The fifth figure is a schematic diagram of the optical path of the backlight system of the first embodiment. The sixth drawing is an enlarged schematic view of the VI portion in the fifth figure. Figure 7 is a partial plan view showing a backlight system of a second embodiment of the present invention. [Description of main component symbols] Backlight system reflective surface illuminating surface 30 > 60 Reflector 411 > 412 Light source 421 Light guide plate 4142 50, 80 曰 Corrected page entrance surface 51 > 81 Bottom surface 52 Light exit surface 53 Scattering structure 521 Reflecting sheet 43 optical film 44 microstructure 511, 811 first plane 512 second plane 513
1111