1251682 13722-ltwf.doc/c 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種平面顯示器，且特別是有關於一 種具有複合式擴散板（brightness触如⑽咖册丽 plate，BEDP)之平面顯示器。 【先前技術】 隨著高科技之發展’視訊產品，_是數位化之視訊 或影像裝置已經成為在一般日常生活中所常見的產品。這 些數位化之視訊或影像裝置巾，歸器是―個重要元件， =員示蝴資訊。使用者可由顯示器讀取#訊，或進而控 制裝置的運作。 而目前最受注目的顯示器是配合光電技術與半導體製 造技術所發展之平面顯示器，例如液晶顯示器(lcd)。由 ϊίί顯=具有低電壓操作、無輻射線散射、重量輕以 及體積小#點，而成為近年來顯示器研究的主要課題， 業界目前積極發展之大尺寸lcd電視，更因為具 備尺寸大、晝紐、輝度高及視肖料慨 寸平面電視的线。 ^马穴尺 、3圖」、疋自知種〉夜晶顯示器之剖面示意圖。請參照圖 吊液晶顯示器是由發出光源的背光模組100以及、用 二晶顯示面板110所構成，其中背光模組· 13/且官102以及罩住燈管搬的反射板（未示於圖中）。 =? 了避免直接觀察到位於燈管102上方的顯示不均 勻現象(Lamp μ⑽），通常會在背光模組1〇〇與液晶顯示 1251682 13722-ltwf.doc/c 面板110間配置一塊擴散板(diffuser piate)i20，來擴散燈 管102光源，且一般會選用霧度(Haze)較高、全光線穿透 率(total transmittance)較低的擴散板120。然而，這樣的設 計又會導致輝度下降，所以又需要再加一塊光學增亮膜 (brightness enhancement film，BEF)140 來增加輝度。另外， 若是採用穿透率較高之擴散板12〇,則需要在擴散板12〇 上再增加擴散片（diffuser sheet)130，以避免直接觀察到燈 管102的形狀。 總之，目前在液晶顯示器中都需要使用好幾層光學膜 片，因而增加成本，並增加組裝工時。 【發明内容】 本發明的目的就是在提供一種平面顯示器，可維持光 學表現，同時降低光學膜片之成本。 本發明的再一目的是提供一種平面顯示器，以減少光 學膜片的使用數目。 本發明的又一目的是提供一種平面顯示器，可維持晝 質效果，同時降低光學膜片之成本。 本發明的另一目的是提供一種平面顯示器，以降低組 裝工時。 一本發明提出一種平面顯示器，包括背光模組、液晶顯 不面板以及複合式擴散板。液晶顯示面板係配置於背光模 組上，而複合式擴散板則位於背光模組與液晶顯示面板之 間。而且，複合式擴散板包括互相嵌合的(embedded)第一 以及第二擴散層’其中第_擴散層鄰近液晶顯示面板配 1251682 13722-ltwf.doc/c 置、弟一擴散層鄰近背光模組配置，且第一與第二擴散層 具有不同之折射率(refractive index)、穿透率(transmittance) 以及霧度值(haze value)。 本發明提出一種平面顯示器，包括背光模組、液晶顯 示面板以及複合式擴散板。液晶顯示面板係配置於背光模 組上，而複合式擴散板則位於背光模組與液晶顯示面板之 間。而且’複合式擴散板包括互相欲合的第一以及第二擴 散層，其中第一擴散層鄭近液晶顯示面板配置、第二擴散 層鄰近背光模組配置，且第一擴散層之折射率大於第^擴 散層之折射率。 本發明提出-種平面顯示器，包括背光模組、液晶顯 示面板以及複合式擴散板。液晶顯示面板係配置於背光模 組上，而複合式擴散板則位於背光模組與液晶顯示面板之 間。而且，複合式擴散板包括互相嵌合的第一以及第二擴 散層，其中弟擴散層鄰近液晶顯示面板配置、第二擴臂^ 層鄰近背光模組配置，且第一擴散層之穿透率小於第二擴 散層之穿透率。 本發明提出-種平面顯示器，包括背光模組、液晶顯 示面板以及複合式擴散板。液晶顯示面板係配置於背光模 組上，而複合式擴散板則位於背光模組與液晶顯示面板之 間。而且，複合式擴散板包括互相嵌合的第一以及第二擴 散層，其中第一擴散層鄰近液晶顯示面板配置、第二擴散 層鄰近背光模組配置，且第一擴散層之霧度值大於第二擴 散層之霧度值。 〃 1251682 13722-ltwf.doc/c 本發明因採用具有兩層不同光學特性的擴散層所組成 的複合式擴散板，所以可將背光模組所發出的光源經擴散 再聚集的方式，使得平面顯示器能夠達到最佳的光學表 現，且不增加光學膜片的數目而維持光學表現與晝質效 果，還可藉此降低組裝工時。 、 為讓本發明之上述和其他目的、特徵和優點能更明顯 易懂，下文特舉較佳實施例，並配合所附圖式，作詳細說 明如下。 ' 【實施方式】 圖2疋依照本發明一較佳實施例的平面顯示器之剖面 示意圖。請參照圖2,本實施例之平面顯示器包括背光模 組200、配置於背光模組2〇〇上之液晶顯示面板21〇以及 一複合式擴散板(brightness enhancement diffuser plate， BEDP)220,其中背光模組2〇〇可為直下式背光模組。而 複合式擴散板220是位於背光模組200與液晶顯示面板 200之間’且複合式擴散板22()包括互相嵌合的第一擴散 層220a以及第二擴散層22〇b，其中第一擴散層22加鄰 近液晶顯示面板210配置、第二擴散層22〇b鄰近背光模 組200配置，且第一擴散層22〇a與第二擴散層22%可以 具有不同之折射率(refractive index)、穿透率(transniittance) 或是霧度值(haze value)。 於一第一實施例中，第一擴散層220a之折射率大於 第二擴散層220b之折射率。其較佳者，第一擴散層22〇a 與第二擴散層220b之折射率的比值介於ι·〇ι與14〇之 1251682 13722-ltwf.doc/c 間；或是第一擴散層220a之折射率介於15〇與19〇之間， 而第一擴散層220b之折射率介於1 ·4〇與1 ·6〇之間。 於一第二實施例中，第一擴散層22〇a之穿透率小於 第二擴散層220b之穿透率。其較佳者，第一擴散層22〇& 與第二擴散層220b之穿透率的比值介於〇·7〇與ι·〇〇之 間；或是第一擴散層220a之穿透率介於〇·7〇與〇·85之間， 而弟二擴散層220b之穿透率介於與〇·9〇之間。 於一第二實施例中，第一擴散層22〇a之霧度值大於 第一擴散層220b之霧度值。其較佳者，第二擴散層22此 與第一擴散層220a之霧度值的比值介於〇·8〇與1〇〇之 間；或是第一擴散層220a之霧度值介於〇9〇與〇96之間， 而弟一擴散層之霧度值介於ο·%與〇·9〇之間。 於一第四實施例中，第一擴散層22〇a之折射率大於 第二擴散層220b之折射率，第一擴散層22〇a之穿透率小 於第二擴散層220b之穿透率，且第一擴散層22〇a之霧度 值大於第二擴散層220b之穿透率。 由本發明之第一實施例、第二實施例、第三實施例、 第四實施例可推知本發明之第一擴散層22〇a與第二擴散 層220b之折射率、穿透率以及霧度值，皆可視產品之需 求任意格配。此外’圖中的各個構件之尺寸未按比例繪製， 亦即複合式擴散板220的總厚度及第一擴散層22〇a與第 —擴散層220b的個別厚度亦可依據實際設計需要作變 化，而不限於圖中所示。 再者，本發明之背光模組200之燈管202，可以為冷 1251682 13722-ltwf.doc/c 陰極螢光燈(cold cathode fluorescent lamp，CCFL)、發光 二極管(light emitting diode，LED)、外電極螢光燈(external electrode fluorescent lamp ，EEFL)、電致發光 (electroluminescent，EL)或平面燈板等。此外，有關本發 明之複合式擴散板220的詳細結構，請參考圖3。 圖3是圖1的平面顯示器中的複合式擴散板220之剖 面放大示意圖。其中，第一擴散層22〇a包含一第一凹陷 部301a與一第一凸起部3〇2a，第二擴散層22〇b包含一 第,凸起部301b與一第二凹陷部3〇2b，且第一凹陷部如“ 與第—凸起部3〇ib互相嵌合，第一凸起部3〇2a與第二凹 =相嵌合。而第一擴散層220a與第二擴散層 肷口界面300可以為如圖面所示之稜鏡面㈣① ^咖）’或是簡單幾何形面、波形面、傅利荦級數曲面 碎形曲面與其它不規則面其_之—。減數曲面、 所謂簡單幾何形面者 面或斜面所構成，如同艮』由各式之間早之平 斜面所構成之^單幾鏡面’即可視為由單純 曲線可由簡單之正仿:V 明波形面者，為其剖面之 數曲面者數所描述者。所謂傅利葉級 謂碎形曲面t、i二級數所描述者。所 =竿_，在。具有白 者。式縮小細節，造成某種猶;節， 1251682 13722-1 twf.doc/c 可斜第-料Wn 明之複合式擴散板之功能，^ ϋ ；； 進行無光表面處理（—％ )， 助擴散層3G3a於第—擴散層22Ga之出光面，^ i ϊΐϊϊ:或者是於第二擴散層2高的入光面處飯 = 用以導電接地，其材料可以為銦氧 化场（Indium Tin Oxide ΤΤΓ>、斗、甘 a、工 ^ e，11ϋ)或其它透明導電材料所製 烕01251682 13722-ltwf.doc/c IX. Description of the Invention: [Technical Field] The present invention relates to a flat panel display, and in particular to a composite diffuser plate (brightness touches (10) , BEDP) flat panel display. [Prior Art] With the development of high-tech video products, _ is a digital video or video device that has become a common product in everyday life. These digital video or video device wipers are an important component, and they are members of the video. The user can read the # message from the display or, in turn, control the operation of the device. At present, the most noticeable display is a flat panel display developed by optoelectronic technology and semiconductor manufacturing technology, such as a liquid crystal display (LCD). Ϊίί显=With low voltage operation, no radiation scattering, light weight and small size, it has become a major issue in display research in recent years. The industry is currently developing large-size LCD TVs, and because of its large size, The line of high brightness and high-definition flat-panel TV. ^Ma-cafe, 3", 疋self-known species> Schematic diagram of the night crystal display. Please refer to the figure hanging liquid crystal display is composed of a backlight module 100 that emits a light source and a two-crystal display panel 110, wherein the backlight module 13 and the official 102 and the reflector that covers the lamp tube are not shown. in). =? Avoid direct observation of the display unevenness above the lamp 102 (Lamp μ (10)), usually a diffuser plate is arranged between the backlight module 1〇〇 and the liquid crystal display 1251682 13722-ltwf.doc/c panel 110 ( The diffuser piate)i20 diffuses the light source of the bulb 102, and generally uses a diffuser 120 having a high haze and a low total transmittance. However, such a design causes a decrease in luminance, so an additional brightness enhancement film (BEF) 140 is needed to increase the luminance. Further, if a diffusion plate 12 having a high transmittance is used, it is necessary to add a diffuser sheet 130 to the diffusion plate 12A to avoid direct observation of the shape of the bulb 102. In summary, several layers of optical films are currently required in liquid crystal displays, thereby increasing cost and increasing assembly man-hours. SUMMARY OF THE INVENTION It is an object of the present invention to provide a flat panel display that maintains optical performance while reducing the cost of the optical film. It is still another object of the present invention to provide a flat panel display to reduce the number of optical diaphragms used. It is still another object of the present invention to provide a flat panel display that maintains the enamel effect while reducing the cost of the optical film. Another object of the present invention is to provide a flat panel display to reduce assembly man-hours. A first aspect of the invention provides a flat panel display comprising a backlight module, a liquid crystal display panel, and a composite diffuser. The liquid crystal display panel is disposed on the backlight module, and the composite diffusion plate is located between the backlight module and the liquid crystal display panel. Moreover, the composite diffuser includes embedded first and second diffusion layers, wherein the first diffusion layer is adjacent to the liquid crystal display panel, and the second diffusion layer is adjacent to the backlight module. The first and second diffusion layers have different refractive indices, transmittances, and haze values. The invention provides a flat panel display comprising a backlight module, a liquid crystal display panel and a composite diffuser. The liquid crystal display panel is disposed on the backlight module, and the composite diffusion plate is located between the backlight module and the liquid crystal display panel. Moreover, the composite diffusing plate includes first and second diffusion layers that are mutually suitable, wherein the first diffusion layer is disposed adjacent to the liquid crystal display panel, the second diffusion layer is disposed adjacent to the backlight module, and the refractive index of the first diffusion layer is greater than The refractive index of the first diffusion layer. The invention proposes a flat panel display comprising a backlight module, a liquid crystal display panel and a composite diffuser. The liquid crystal display panel is disposed on the backlight module, and the composite diffusion plate is located between the backlight module and the liquid crystal display panel. Moreover, the composite diffusion plate includes first and second diffusion layers which are mutually fitted, wherein the diffractive layer is adjacent to the liquid crystal display panel, the second reaming layer is adjacent to the backlight module, and the transmittance of the first diffusion layer is Less than the transmittance of the second diffusion layer. The invention proposes a flat panel display comprising a backlight module, a liquid crystal display panel and a composite diffuser. The liquid crystal display panel is disposed on the backlight module, and the composite diffusion plate is located between the backlight module and the liquid crystal display panel. Moreover, the composite diffusion plate includes first and second diffusion layers that are mutually fitted, wherein the first diffusion layer is adjacent to the liquid crystal display panel, the second diffusion layer is disposed adjacent to the backlight module, and the haze value of the first diffusion layer is greater than The haze value of the second diffusion layer. 〃 1251682 13722-ltwf.doc/c The invention adopts a composite diffusion plate composed of two diffusion layers with different optical characteristics, so that the light source emitted by the backlight module can be diffused and re-aggregated, so that the flat display The ability to achieve optimal optical performance without maintaining the number of optical films maintains optical performance and enamel effect, thereby reducing assembly man-hours. The above and other objects, features, and advantages of the present invention will become more fully understood from Embodiments Fig. 2 is a cross-sectional view showing a flat panel display in accordance with a preferred embodiment of the present invention. Referring to FIG. 2, the flat panel display of the embodiment includes a backlight module 200, a liquid crystal display panel 21〇 disposed on the backlight module 2〇〇, and a brightness enhancement diffuser plate (BEDP) 220, wherein the backlight The module 2 can be a direct type backlight module. The composite diffuser 220 is located between the backlight module 200 and the liquid crystal display panel 200, and the composite diffuser 22 () includes a first diffusion layer 220a and a second diffusion layer 22b interposed therebetween, wherein the first The diffusion layer 22 is disposed adjacent to the liquid crystal display panel 210, and the second diffusion layer 22〇b is disposed adjacent to the backlight module 200, and the first diffusion layer 22〇a and the second diffusion layer 22% may have different refractive indices. , transniittance or haze value. In a first embodiment, the refractive index of the first diffusion layer 220a is greater than the refractive index of the second diffusion layer 220b. Preferably, the ratio of the refractive indices of the first diffusion layer 22 〇 a and the second diffusion layer 220 b is between ι·〇ι and 14 〇 1251682 13722-ltwf.doc/c; or the first diffusion layer 220a The refractive index is between 15 〇 and 19 ,, and the refractive index of the first diffusion layer 220b is between 1/4 1 and 1.7 。. In a second embodiment, the transmittance of the first diffusion layer 22a is smaller than the transmittance of the second diffusion layer 220b. Preferably, the ratio of the transmittance of the first diffusion layer 22 〇 & and the second diffusion layer 220 b is between 〇·7〇 and ι·〇〇; or the transmittance of the first diffusion layer 220a. Between 〇·7〇 and 〇·85, and the penetration rate of the second diffusion layer 220b is between 〇·9〇. In a second embodiment, the haze value of the first diffusion layer 22a is greater than the haze value of the first diffusion layer 220b. Preferably, the ratio of the haze value of the second diffusion layer 22 to the first diffusion layer 220a is between 〇·8〇 and 1〇〇; or the haze value of the first diffusion layer 220a is between 〇 Between 9〇 and 〇96, the haze value of the diffusion layer of the brother is between ο·% and 〇·9〇. In a fourth embodiment, the refractive index of the first diffusion layer 22〇a is greater than the refractive index of the second diffusion layer 220b, and the transmittance of the first diffusion layer 22〇a is smaller than the transmittance of the second diffusion layer 220b. And the haze value of the first diffusion layer 22〇a is greater than the transmittance of the second diffusion layer 220b. The refractive index, transmittance, and haze of the first diffusion layer 22A and the second diffusion layer 220b of the present invention can be inferred from the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment of the present invention. The value can be arbitrarily matched according to the needs of the product. In addition, the dimensions of the various components in the drawings are not drawn to scale, that is, the total thickness of the composite diffuser 220 and the individual thicknesses of the first diffusion layer 22a and the first diffusion layer 220b may also vary according to actual design requirements. Not limited to the one shown in the figure. Furthermore, the lamp tube 202 of the backlight module 200 of the present invention may be cold 1251682 13722-ltwf.doc/c cold cathode fluorescent lamp (CCFL), light emitting diode (LED), external Electrode fluorescent lamp (EEFL), electroluminescent (EL) or flat panel. Further, regarding the detailed structure of the composite diffusion plate 220 of the present invention, please refer to FIG. Figure 3 is an enlarged cross-sectional view showing the composite diffuser 220 of the flat panel display of Figure 1. The first diffusion layer 22A includes a first recess 301a and a first protrusion 3〇2a, and the second diffusion layer 22b includes a first, a protrusion 301b and a second recess 3〇. 2b, and the first recessed portion is "fitted with the first boss portion 3〇ib, and the first boss portion 3〇2a is fitted with the second recess=. The first diffusion layer 220a and the second diffusion layer The port interface 300 can be a faceted surface (four) 1 ^ coffee) as shown in the figure or a simple geometric face, a wave face, a Fourier series curved surface and other irregular faces. The so-called simple geometric face is composed of a face or a bevel. It is like a simple facet composed of early flat bevels. It can be regarded as a simple curve by a simple curve: V. It is described by the number of curved surfaces of the section. The so-called Fourier class is the one described by the second and second numbers of the fractal surface t and i. The = 竿 _, in. has white. The details are reduced, causing some kind of hex; , 1251682 13722-1 twf.doc/c The function of the composite diffuser can be slanted to the material Wn, ^ ϋ ;; (-%), the diffusion-promoting layer 3G3a is on the light-emitting surface of the first diffusion layer 22Ga, ^ i ϊΐϊϊ: or at the high light-incident surface of the second diffusion layer 2, the rice is used for conductive grounding, and the material thereof may be indium oxide In0 (Indium Tin Oxide ΤΤΓ>, Dou, Gan, gong, e, 11ϋ) or other transparent conductive materials
因此，當光線30從底下的背光模組2〇〇(如圖2所示 向上射入第二擴散層22〇b並到達界面3⑽時，合利用這 種稜鏡_界面300產生折射，峨麟3()的路徑向複 合式擴散板220的法線方向偏移，而達到聚光的效果。Therefore, when the light 30 is incident from the bottom backlight module 2 (as shown in FIG. 2 to the second diffusion layer 22〇b and reaches the interface 3 (10), the 稜鏡_interface 300 is used to generate the refraction, Kirin The path of 3() is shifted toward the normal direction of the composite diffusion plate 220 to achieve the effect of collecting light.
此外，本實施例之複合式擴散板尚有其它型態，如圖 4所示。目4是圖1的平面顯示器中的另一種複合式擴散 板之剖面放大示意圖。其中，第一擴散層22〇a包含一第 —=板404、一第一凹陷部401a與一第一凸起部4〇2。 而第一凹陷部401a與第一凸起部4〇2a配置於第一平板 4〇4上，其中第一凸起部402a與第一平板4〇4具有不同 之牙透率以及務度值，但可選擇具有相近折射率之材質。 再者，第二擴散層220b包含一第二平板4〇6、一第二凸 ^部401b與一第二凹陷部402b，而第二凸起部4〇lb與 第二凹陷部402b配置於第二平板4〇6上，其中第二凸起 邙401b與第二平板406具有不同之穿透率以及霧度值， 但可選擇具有相近折射率之材質。 舉例來說，圖4所示之複合式擴散板中當第一凹陷部 11 1251682 13722-ltwf.doc/c 401a與第一凸起部4〇2a之折 =，二凹陷部402b之折射率為“ 射率約可選擇在w〜⑸的範_。一 互相1Γ，第—凹陷部_與第二凸起部· η 一凸起部402續第二凹陷部4 第一擴散層220a與第 二 :=。而第一擴散層2咖與第二擴散層2= 所述，可為圖面所示之棱鏡面，或“ 面波則利葉級數曲面、碎形曲面或者是 能，對ί 了ί:步增進本發明之複合式擴散板之功 m 弟擴月層之出光面，以增加^ 。或者是於第二擴散層22Gb的入光面處配置—透 明導電獏403b用以導電接地。 处置透 辟神紅上所示，本發明之特點在於採用具有兩層不同光學 複人射率、穿透率與霧度值等之擴散層所組成ΐ 聚^^板’所以可將背光模組所發出的光源經擴散再 Ν 工達到歲佳的光學表現，且不增加光學^Η^ 2目而維持光學表現與畫質效果，還可藉此降 —雖’、、、:本發明已以較佳實施例揭露如上，然其並非用以 疋本么明，任何熟習此技藝者，在不脫離本發明之精神 12 1251682 13722-1 twf.doc/c 和範圍内，當可作些許之更動與潤 範圍當視後附之申請專利範圍所界定 $本發明之保護 【圖式簡單說明】 #4準 圖1是習知—種液晶顯示器之剖面示意圖。 面示=是舰本贼—触編的平面顯示器之剖 一種複合式擴散板之剖 圖3是圖1的平面顯示器中的 面放大示意圖。 種複合式擴散板之 刹面=:平*_中的另- 【主要元件符號說明】 30、40 :光線 100、200 :背光模組 102、202 :燈管 110、210 :液晶顯示面板 120 :擴散板 130 =擴散片 140 :光學增亮膜 220 :聚光擴散板 220a、220b ·擴散層 300、400 :界面 301a、401a :第一凹陷部 301b、401b ·弟二凸起部 302a、402a :第一凸起部 1251682 13722-ltwf.doc/c 302b、402b :第二凹陷部 303a、403a :輔助擴散層 303b、403b :透明導電膜 404 :第一平板 406 :第二平板In addition, the composite diffuser of this embodiment has other types, as shown in FIG. Figure 4 is an enlarged cross-sectional view of another composite diffuser in the flat panel display of Figure 1. The first diffusion layer 22A includes a first plate 404, a first recess 401a and a first boss 4〇2. The first recessed portion 401a and the first raised portion 4〇2a are disposed on the first flat plate 4〇4, wherein the first raised portion 402a and the first flat plate 4〇4 have different tooth permeability and service values. However, materials having similar refractive indices can be selected. Furthermore, the second diffusion layer 220b includes a second flat plate 4〇6, a second convex portion 401b and a second concave portion 402b, and the second convex portion 4〇1b and the second depressed portion 402b are disposed at the second portion On the second plate 4〇6, the second protrusions 401b and the second plate 406 have different transmittances and haze values, but materials having similar refractive indices may be selected. For example, in the composite diffusing plate shown in FIG. 4, when the first depressed portion 11 1251682 13722-ltwf.doc/c 401a and the first raised portion 4〇2a are folded, the refractive index of the second depressed portion 402b is "The rate of radiation can be selected from the range of w~(5). One mutually, the first recessed portion_the second raised portion·n the raised portion 402 continues the second recessed portion 4 the first diffusion layer 220a and the second :=. While the first diffusion layer 2 and the second diffusion layer 2= are described, the prism surface shown in the figure may be, or “the surface wave is the gradient surface, the fractal surface or the energy, for ί: Steps to enhance the luminous surface of the composite diffuser of the present invention, to increase the thickness of the moon. Alternatively, it is disposed at the light incident surface of the second diffusion layer 22Gb - the transparent conductive germanium 403b is used for conductive grounding. The invention is characterized in that it adopts a diffusion layer composed of two layers of different optical complex human incidence, transmittance and haze value, etc., so that the backlight module can be used. The emitted light source is diffused and then processed to achieve the good optical performance of the old age, and the optical performance and image quality effect are maintained without increasing the optical quality, and the image quality can be lowered, although the 'the, the invention has been The preferred embodiments are disclosed above, but they are not intended to be used by those skilled in the art, and those skilled in the art can make some changes without departing from the spirit of the present invention 12 1251682 13722-1 twf.doc/c. The scope of the application is defined by the scope of the appended patent application. The protection of the present invention [Simple description of the drawing] #4 Figure 1 is a schematic cross-sectional view of a conventional liquid crystal display. Face = is a ship thief - a cross-sectional view of a touch screen. A cross section of a composite diffuser Fig. 3 is an enlarged schematic view of the flat display of Fig. 1. The brake surface of the composite diffuser =: the other in the flat *_ [Description of the main components] 30, 40: Light 100, 200: backlight module 102, 202: lamp 110, 210: liquid crystal display panel 120: Diffuser 130 = diffuser 140: optical brightening film 220: concentrating diffusing plates 220a, 220b - diffusing layers 300, 400: interfaces 301a, 401a: first recessed portions 301b, 401b, second convex portions 302a, 402a: First convex portion 1251682 13722-ltwf.doc/c 302b, 402b: second depressed portion 303a, 403a: auxiliary diffusion layer 303b, 403b: transparent conductive film 404: first flat plate 406: second flat plate
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