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1、LCD 背光模组设计 1 Color filter LCD PCB Backlight module 液晶显示器的结构 实物图 平板显示技术_C2 LCD_4TFTLCD组成.ppt 2 contents Section 1 I: Introduction to Fundamental Optics II: Apply Optics to LGP( light-guiding plate) Section 2 III: Applied Optics in the Construction of the Back-light Modules IV: The future of the Back-
2、light Modules Section 3 V：Backlight Design and Simulation 3 The main optical units constructed in back-light modules prism lens diffuser LGP reflector Lamp reflector CCFL Patterns (elements) 4 The Reflection and Refraction of Light 1,Reflection and refraction phenomena will happen on the interface w
3、hen light transports through it. 2, the reflection of light acts according to the reflection rule. 3, the refraction of light acts according to the refraction rule. 5 The Reflection Rule of Light 1,insert line( ),normal( ) and reflect line( ) are on the same plane. 2,insert angle is equal to the ref
4、lection angle. 6 The Refraction Rule of Light 1, ,insert line( ),normal( ) and reflect line( ) are on the same plane. 2,insert angle and refraction angle act according to the Snells law 7 The meanings of the Snells Law 1,if 2,if Whats happened when ? 8 The Critical Angle and Total Reflection When an
5、d Critical angle Total reflection Normal refraction 9 Diffusion When parallel light waves moving through rough surfaces or particles, diffusion will be formed by the reason that non- parallel factor of the normal for those surfaces and particles. 10 The diffusion effect depends on the roughness of t
6、he interface of the media. 11 Applied optics to LGP fundamental principles- total reflection and diffusion the optical properties of the printed units the optical properties for different types of reflection units the properties of the print-less LGPs 12 Critical angles and total reflection of LGP C
7、ritical angle 13 Refraction Index v.s. LGP (Light-Guiding plate) Refraction indexproper energy LGP 14 Refraction index v.s. LGP refraction indexeffective area of luminary 15 折射率大者，单位面积能量利用效率较大 Refraction Index v.s. LGP 16 折射率大小对导光板选择的影响 折射率大者, 单位面积有效出光角较小 17 印刷点的光学性质 印刷点是用高反射或高折射材料混合油墨印刷在 导光板的反光侧，藉由
8、改变光路径形成漫射效果 导光板 反光面 出光面 印刷点 18 19 印刷点对光能的有效使用率 油墨比 入射至印刷点单位面积光能量 印刷点截面积 20 油墨比与光能的有效使用率 21 印刷點截面積,入射至印刷點單位面積光能量與光能的有效使用率 22 测量与设计的修正 量测区域, 区域面积 23 印刷点的极限 容易受环境条件改变而缩短寿命 受印刷网版网目极限限制dimension(250m) 24 无印刷导光板的光学性质 定义:何谓“无印刷” “无印刷”的方法种类 1,机械加工 2,刻蚀 3,薄板取代 4,其它 各种“無印刷”的方法所形成patterns的光学 特性 25 机械加工 刻蚀 薄板取代
9、 26 無印刷的定義: 把所需的光反射元件先行轉置在模具上,然後用一體成型 得到所要物件的方法 無印刷導光板: 用無印刷方法所製作的導光板 27 機械加工法光反射元件的光學原理與特性 V-groove type U-groove type 28 29 30 反射元件間隙(pitch)的影響 31 蝕刻法光反射元件的光學原理與特性 32 薄板取代法: 師法於“半導體”的製程,主要是微小光反射元件,可增加局 部區域能量調整的程度 intensity intensity 33 Photo mask Photo resist substrate Parallel light Form the meta
10、l plate by electro-forming 34 各種無印刷方法的比較 35 背光模組整体结构 稜鏡片(prism lens) 扩散片(diffuser) 导光板(LGP) 反射片(reflector) 36 反射板与导光板间 反射板一般为“扩散反射”,用以增加回授的光 能可用率 37 扩散板与导光板间 38 Diffuser - prism lens 39 40 The future and challenge of Backlight modules 1,future: LCD scaleBL 2,challenge: (1),Brightness, Uniformity (2)
11、, Notebookthinner and thinner Monitor larger and larger (3),EL, OLED, 41 Advanced SPECTER Features OPTOS, MODIFIERS & OBSERVERS Design of Backlight Illuminating Systems 42 Polarization filter (DBEF) Light Guiding Plate with microdimples Bottom and side reflectors Lamp (CCFL) Lamp reflector Prism she
12、et (BEF) Diffuse sheet Particles inside LGP material Geometrical and Optical Complexity of Light Propagation a typical scheme of backlight system Tracking billions of stochastically generated light rays demands an efficient General Purpose Ray Tracing scheme Light tracking of mega-, giga-, and tera-
13、 deterministically or/and stochastically distributed microelements with complex, diversified shapes necessitates a Procedurally oriented Ray Tracing Multiple internal reflections in LGP Microgrooves of BEF Dimples on bottom LGP face Light scattering in a media containing multitude of micro and nano
14、densely packed particles demands accommodation of Wave Optics phenomena Light reflection in stochastic micro- roughness demands a Procedural Ray Tracing Scheme Microroughness on LGP surface Films, diffuse sheets, polarization filters enforce complex light transformations including polarization Compl
15、ex polarization filter (DBEF) 43 OPTOS Raison Detre: Accurate and Efficient Light Tracking in Geometrically and Optically Complex Environments Technologically advanced optical devices are characterized by simultaneous occurrence of complex light propagation phenomena exemplified by Light Polarizatio
16、n, Volume Scattering, Wave Effects, etc. To address this level of optical complexity in both precise and efficient fashion, a special branch of classes of OPTical ObjectS (OPTOS) has been devised and incorporated in SPECTER. OPTOS concept example : DIMPLES LGP Dimples on bottom LGP face Lamp (CCFL) Lamp reflector OPTOS box Ray spreads in a scene and hits a surface with OPTOS Ray leaves OPTOS and continues spread
