200949304 六、發明說明： 【發明所屬之技術領域】 本發明涉及一種棱鏡片、使用上述棱鏡片的背光單 元，以及具備上述为光單元的液晶顯示裝置，尤其涉及一 種具有所定的波形週期的縱向波形棱鏡峰的棱鏡片，使用 該棱鏡片的背光單元錢具備上述背光單元的液晶顯示裝 置。 【先前技術】 最近，作為要求纖薄、小巧且電力消費低等功能的用 於筆s己本電腦、電視以及移動電話等的平面顯示裝置（Fiat panel display device)’ 開發出 了電漿顯示板（plasma display panel· PDP )、場發射顯不器（field emission display device: FED )、薄膜電晶體液晶顯不器（thin film transistor liquid crystal display device: TFT-LCD)等，其中對色再現性優秀 且纖薄的液晶顯示裝置的研究最活躍。 上述平面顯示裝置中PDP以及FED本身就可以發光， 但液晶顯示裝置其本身不是發光體，因此需要利用輔助光 源即背光單元來照射光，從而實現圖像顯示。上述背光單 元在照射光時，為達到均勻照射整個畫面的要求，需要具 備稱之為侧入式或直下式的面光源的結構。 圖1為顯示具備侧入式光源的背景技術中背光單元的 分離斜視圖。 參照圖1，具備側入式光源的背景技術中的背光單元 10，包含：光源11、對上述光源11發射的光進行導向的導 200949304 光板12、配置在導光板12下方的反射片13、配置在導光板 12上方的擴散片14、配置在擴散片14上方的棱鏡片15以及 配置在棱鏡片15上方的保護片16。還有，在背光單元的光 源11外侧設有光源罩11a。還有，雖然在此未圖示，但在上 述背光單元10上依次配置液晶顯示板與防反射層而構成液 晶顯示裝置。還有’在上述液晶顯示板的上、下兩個面上 各一張共配置兩張偏光板。 ^ 光源11用於發射光’可使用線光源的燈或面光源的 • 燈、CCFL或LED等多種多樣的光源。 導光板12將光源11發射的光導向至擴散片14，當選甩 直下式的光源時可以省略。 反射片13用於反射光源11發射的光使朝擴散片14方向 傳達。 擴散片14用於擴散以及傳播通過導光板12入射的光， 並傳達至棱鏡片15。 棱鏡片15對通過擴散片14入射的光進行折射而聚光至 〇 液晶顯示板（未圖示）的平面上。棱鏡片根據高的聚光敢 率、寬的可視角度、防止龜紋現象（moire effect)、防止 與其他薄膜發生光輕合（wet out)等多種多樣的設計目標， 可對棱鏡峰的形狀以及峰傾斜面的角度等進行多種多樣的 設計值的改變與組合’並且作商業上應用。圖1顯示了，其 中的一種在各上面設有條紋形狀排列的三角形棱鏡峰的兩 張棱鏡片15a、15b相互垂直交叉配置的一例。 另一方面，為保護棱鏡片15 ’在棱鏡片15上方配置保 200949304 護片16是必不可少的。 然而，具備如上結構的棱鏡片15，由於在製造時其表 面容易受損或者在其内部容易混入異物等原因，經常發生 劣質產品。如上棱鏡片15存在不良時，使用者就會覺得液 晶顯不裝置的畫質差’因此存在不良的棱鏡片15需及時確 認並廢棄。這樣最終導致棱鏡片15的生產量降低。 還有，具備如上結構的根據背景技術的背光單元，其 棱鏡峰為朝一定方向的條紋形狀，從而棱鏡峰的圖樣與液 晶顯示板的RGB圖樣重#，因此存在引發龜紋現象的問 題。 還有，此時棱鏡片15的棱鏡峰的形狀設定為條紋形 狀」從而各棱鏡片15a、i5b與鄰接的片15b、16接觸的表面 積就會增力π目此存在引發光麵合（wet_〇ut)現象的問題。 ，此，光耦合現象是指兩個表面相互光學接觸而消除從一 薄膜向，-薄膜傳達光畴射率的變化時發生的現象，觀 察者會認為屏幕上的圖像花花點點且具有睛變化的外觀 的現象。這種綠合現象尤其在使用具有 為光學效果而立體化的表面（即，棱鏡峰）的2時^ 在問題。 【發明内容】 鏡的=的一實施例為具有所定波形週期的縱向波形棱 本發明的另一實施例為使用上述棱鏡片的背光單元。 本發明的又-實施例為具備上述背光單元的液晶顯示 200949304 裝置。 本發明的一面提供一種棱鏡片，其具備： 透明基板；以及 配置在上述透明基板上的縱向波形的棱鏡♦，上述縱 向波形為上述棱料的高麟著長度發生賴或不連續的 改變的形狀’上述縱向波形的波料期為上述棱鏡 均高度的50至1〇〇倍。 上述棱鏡峰可以具有三角形的截面。 上述棱鏡修可以是底邊長度為25口111至1111111，高度為$ 至 600μιη。 " 上述棱鏡峰的頂角可以為60至115。。 上述棱鏡峰可以具有弓形的截面。 元本發月方面還提供一種具備上述棱鏡片的背光單 j明另-方面還提供_種具備上述背光單元的液晶 ❹ 頌不裝置。 易懂為讓本發明之上述和其他目的、特徵和優點能更明顯 下文特舉較佳實施例，並配合所附圖式，作詳細說 %如下。 【實施方式】 ^ ，·、、、附圖來詳細說明根據本發明一實施例的棱 鏡片。 圖^為頌示根據本發明一實施例的棱鏡片的斜視圖，圖 為顯示圖2的棱鏡片與#加在其上方的其他光學薄膜的截 200949304 面圖。 參照圖2，根據本發明-實施例的棱鏡片25具備透明基 板25a以及棱鏡峰25b。 透明基板25a由聚醋樹脂等材料形成，可使入射的光透 過0 棱鏡峰2魏置在透板25a上，將通過透明基板25a 入射的光聚光到液晶顯示板（未圖示）的平面上。棱鏡峰 25b由與透明基板25a相同的材料形成為佳，但本發明並不 限定於此。本實施例中，棱鏡峰25b具有縱向波形 (lengthwise wave pattern)。具體說，上述縱向波形設計 成棱鏡峰25b高度隨長度發生連續或不連續的改變。這樣設 計棱鏡峰25b，就如圖3所示可以減少棱鏡片25上疊加的其 他光學薄膜30與棱鏡峰25b接觸的表面積，從而降低異物^ 混入、由於接觸發生的刮痕（scratch)以及使用者的不良 視認性，以減少產品的不良率，而且可以防止光耦合現象 的發生。對此下面還作詳細地說明。 然而，如上改變棱鏡峰25b的高度時，入射在棱鏡片25 上的光通過棱鏡峰25b的頂部出射光時，該出射位置非常多 變，所以聚光到棱鏡片25正面的光量就會減少。因此，使 用具有如上結構的棱鏡片25的液晶顯示板存在正面亮度減 少的問題。 為解決這些問題，棱鏡峰25b，其波形具有棱鏡峰25b 的平均高度h25b，avg的50至100倍的波形週期rp。這樣限定 棱鏡峰25b縱向波形的波形週期Rp ,就可以在一定程度上 200949304 減少由於棱鏡峰25b的縱向波形引發的前述正面亮度減少 的問題。即，棱鏡峰25b縱向波形的波形週期貯為5〇以上 時與相反情況相比，出射的光的方向有規則地朝向正面， 因此能夠提高使用這種棱鏡片25的液晶顯示裝置的正面亮 度。然而，當上述波形週期RP超過1〇〇時，棱鏡片15a、l5b 與鄰接的片15b、16接觸的表面積就會增加，從而存在發生 光麵合（wet-out)的問題。 〇 還有，上述棱鏡峰2%具有三角形的截面為佳，其底邊 長度為25μιη至1mm，高度為5至600μηι，頂角為60至115。。 在此’底邊是指在棱鏡峰25b厚度方向的截面上，與透明基 板25a的平面接觸的棱鏡峰25b的一邊，頂角是指在棱鏡峰 25b厚度方向的截面上，與上述底邊相對應的棱鏡峰说的 a個角。若棱鏡峰25的截面形狀、大小以及頂角超過上述 範圍’那麼正面亮度就會降低且可視角度變窄，因此效果 欠佳。但’本發明並不限定於此，上述棱鏡峰说可以具有 四邊形、五邊形、弓形等其他多種多樣形狀的截面。 ® 下面，參照圖3來詳細說明縱向波形的棱鏡峰25b增加 生產量並防止光耦合的原理。 參照圖3，棱鏡片25的上表面S中只有表面接觸部C與 光學薄膜30進行光學接觸。此時，光學薄膜％可以是偏光 板（未圖示）中包含的薄膜。 本實_帽料挪如上所賴計成，料親長度 生連續或不連續的改變的縱向波形，從而棱鏡峰25b的表 面S中表面接觸部C比非接觸部（即，除c部分以外的s部分） 200949304 顯者小。^b ’ A部分光L1從上述非闕部出射後，在棱 鏡片25與空氣Μ之間的界面上折射’並通過空氣層A後入 射到光予;I膜3G_L。相反地，其餘少量的紅2幾乎不發生 折=而直接通過表面接觸部c而人㈣光學薄卿上，但 其里非常夕，因此觀察者不會認識到表面接觸部c的透過 特徵與周圍領域（即，空氣層A)不同，因此結果上也不 會認識到該部分C為異常或不良的部分。還有，由於棱鏡 峰25b設計成縱向波形，因此與液晶顯示板（未圖示）的 RGB圖樣的光學重疊就會減少或者被排除，從喊得減少 或防止龜紋現象的效果。 同時，由於表面接觸部C與非接觸部相比非常小，因 此能夠減少通過表面接觸部C混人的異物，並減少在表面 接觸部C發生的到痕，而從整體上降低產品不良率。還有， 由於棱鏡峰25b的高度發生多種改變，因此出射位置也多 變’從而即使存在產^不良使用者也魏明確視認，這樣 就可以對不良產品不進行廢氣處理而照樣使用，從而減少 產品不良率。 下面，通過實施例來詳細說明本發明，但本發明並不 限定於下述實施例。 實施例 對於具有與圖2類似的結構的棱鏡片，進行如下的模擬 測s式，調查了隨縱向波形的波形週期的正面亮度的變化， 其結果如圖4所示。 (使用的模擬軟體） 200949304 作為電腦模擬測試的軟體使用了 Optical Research Association公司的LightTools 6.0軟體。 (模擬測試的參數） •光線數量（Number of Ray) :3,000,000 Rays •光線功率閾值（RayPowerThreshold) :0.001 •光源總功率（Source Total Power) :1 lumen •光源的角分佈（Angular distribution of Source):朗 伯（Lambertian ) ◎ (待測試棱鏡Μ ) •長 X 寬：12.7cm X 8.89cm •棱鏡峰的高度：24.5〜26.5柳 •棱鏡峰底邊的長：49〜53/λπ *縱向波形的波形週期：l，〇〇〇/zm,l，5〇〇//m •透明基板的折射率：1.667 •棱鏡峰的折射率：在1.48〜1.62的範圍内調節 (Increment: 0.03)BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prism sheet, a backlight unit using the prism sheet, and a liquid crystal display device having the above-described light unit, and more particularly to a longitudinal waveform having a predetermined waveform period. The prism sheet of the prism peak and the backlight unit using the prism sheet have the liquid crystal display device of the backlight unit described above. [Prior Art] Recently, a plasma display panel has been developed as a flat display device for a computer, a television, a mobile phone, etc., which is required to be slim, compact, and low in power consumption. (plasma display panel· PDP), field emission display device (FED), thin film transistor liquid crystal display device (TFT-LCD), etc., among which excellent color reproducibility And the research on slim LCD devices is the most active. In the above flat display device, the PDP and the FED itself can emit light. However, the liquid crystal display device itself is not an illuminant. Therefore, it is necessary to illuminate the light by using a backlight unit, which is an auxiliary light source, to realize image display. In order to achieve uniform illumination of the entire screen when the backlight unit is irradiated with light, it is necessary to have a surface light source called a side-entry type or a direct type. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a separation of a backlight unit in a background art having a side-entry light source. Referring to Fig. 1, a backlight unit 10 in the background art including a side-entry light source includes a light source 11, a light guide 1214 that guides light emitted from the light source 11, a light guide plate 12 disposed under the light guide plate 12, and a configuration A diffusion sheet 14 above the light guide plate 12, a prism sheet 15 disposed above the diffusion sheet 14, and a protective sheet 16 disposed above the prism sheet 15. Further, a light source cover 11a is provided outside the light source 11 of the backlight unit. Further, although not shown here, the liquid crystal display panel and the antireflection layer are sequentially disposed on the backlight unit 10 to constitute a liquid crystal display device. Further, two polarizing plates are disposed on each of the upper and lower surfaces of the liquid crystal display panel. ^ The light source 11 is used to emit light 'a variety of light sources such as a lamp of a line source or a surface light source, a CCFL or an LED. The light guide plate 12 guides the light emitted from the light source 11 to the diffusion sheet 14, which may be omitted when the direct light source is selected. The reflection sheet 13 is for reflecting the light emitted from the light source 11 to be transmitted toward the diffusion sheet 14. The diffusion sheet 14 is for diffusing and propagating light incident through the light guide plate 12, and is transmitted to the prism sheet 15. The prism sheet 15 refracts light incident through the diffusion sheet 14 and condenses it onto a plane of a liquid crystal display panel (not shown). The prism sheet has a variety of design targets such as a high concentration ratio, a wide viewing angle, a moire effect, and a light out of contact with other films, and the shape of the prism peak and The angles of the peak inclined faces and the like are varied and combined with various design values' and are used commercially. Fig. 1 shows an example in which two prism sheets 15a and 15b each having a triangular prism peak arranged in a stripe shape are arranged perpendicularly to each other. On the other hand, it is indispensable to arrange the 200949304 protective sheet 16 above the prism sheet 15 in order to protect the prism sheet 15'. However, the prism sheet 15 having the above configuration often causes inferior products due to the fact that the surface thereof is easily damaged at the time of manufacture or the foreign matter is easily mixed therein. When the prism sheet 15 is defective as described above, the user feels that the liquid crystal display device has poor image quality. Therefore, the defective prism sheet 15 needs to be confirmed and discarded in time. This eventually causes the production amount of the prism sheet 15 to decrease. Further, the backlight unit according to the background art having the above configuration has a prism peak which is a stripe shape in a certain direction, and the pattern of the prism peak and the RGB pattern of the liquid crystal display panel are heavy #, so that there is a problem of causing a moiré phenomenon. Further, at this time, the shape of the prism peak of the prism sheet 15 is set to a stripe shape, so that the surface area of each of the prism sheets 15a, i5b in contact with the adjacent sheets 15b, 16 is increased by π, which causes the light surface to be combined (wet_) 〇ut) The problem of the phenomenon. Therefore, the optical coupling phenomenon refers to a phenomenon in which two surfaces are in optical contact with each other to eliminate a change in the optical domain transmittance from a film to a film, and the observer thinks that the image on the screen is a little bit and has an eye. The phenomenon of changing appearance. This greening phenomenon is particularly problematic when using a surface having a stereoscopic effect (i.e., a prism peak) having an optical effect. SUMMARY OF THE INVENTION An embodiment of a mirror = a longitudinal waveform edge having a predetermined waveform period. Another embodiment of the present invention is a backlight unit using the prism sheet described above. Still another embodiment of the present invention is a liquid crystal display 200949304 device including the above backlight unit. One aspect of the present invention provides a prism sheet comprising: a transparent substrate; and a longitudinally-shaped prism ♦ disposed on the transparent substrate, wherein the longitudinal waveform is a shape in which a high-long length of the rib is changed or discontinuously changed The wave period of the above longitudinal waveform is 50 to 1 times the height of the above prisms. The above prism peaks may have a triangular cross section. The above prism repair may have a base length of 25 ports 111 to 1111111 and a height of $ to 600 μm. " The apex angle of the above prism peaks may be 60 to 115. . The above prism peaks may have an arcuate cross section. The present invention also provides a backlight unit having the above prism sheet, and further provides a liquid crystal 具备 装置 device having the above backlight unit. The above and other objects, features, and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] A prism lens according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 2 is a perspective view showing a prism sheet according to an embodiment of the present invention, showing a cross-sectional view of the prism sheet of Fig. 2 and other optical films placed thereon. Referring to Fig. 2, a prism sheet 25 according to an embodiment of the present invention is provided with a transparent substrate 25a and a prism peak 25b. The transparent substrate 25a is formed of a material such as a polyester resin, and allows incident light to pass through the 0 prism peak 2 to be placed on the transparent plate 25a, and collects light incident through the transparent substrate 25a to a plane of the liquid crystal display panel (not shown). on. The prism peak 25b is preferably made of the same material as the transparent substrate 25a, but the present invention is not limited thereto. In this embodiment, the prism peak 25b has a lengthwise wave pattern. Specifically, the above longitudinal waveform is designed such that the height of the prism peak 25b changes continuously or discontinuously with the length. By designing the prism peak 25b in this way, as shown in FIG. 3, the surface area of the other optical film 30 superposed on the prism sheet 25 in contact with the prism peak 25b can be reduced, thereby reducing the foreign matter, the scratch caused by the contact, and the user. The poor visibility makes it possible to reduce the defect rate of the product and prevent the occurrence of optical coupling. This will be explained in detail below. However, when the height of the prism peak 25b is changed as described above, when the light incident on the prism sheet 25 is emitted through the top of the prism peak 25b, the exit position is extremely variable, so that the amount of light concentrated on the front surface of the prism sheet 25 is reduced. Therefore, the liquid crystal display panel using the prism sheet 25 having the above structure has a problem that the front luminance is reduced. To solve these problems, the prism peak 25b has a waveform having an average height h25b of the prism peak 25b and a waveform period rp of 50 to 100 times the avg. By defining the waveform period Rp of the longitudinal waveform of the prism peak 25b in this way, the problem of the aforementioned reduction in front luminance caused by the longitudinal waveform of the prism peak 25b can be reduced to some extent by 200949304. In other words, when the waveform period of the longitudinal waveform of the prism peak 25b is stored at 5 Å or more, the direction of the emitted light is regularly directed toward the front surface. Therefore, the front luminance of the liquid crystal display device using the prism sheet 25 can be improved. However, when the waveform period RP exceeds 1 上述, the surface area of the prism sheets 15a, 15b in contact with the adjacent sheets 15b, 16 increases, and there is a problem that a wet-out occurs. Further, it is preferable that the prism peak 2% has a triangular cross section, and has a base side length of 25 μm to 1 mm, a height of 5 to 600 μm, and an apex angle of 60 to 115. . Here, the 'bottom edge" refers to one side of the prism peak 25b that is in contact with the plane of the transparent substrate 25a in the cross section in the thickness direction of the prism peak 25b, and the apex angle refers to the cross section in the thickness direction of the prism peak 25b. The corresponding angle of the prism peak is a. If the cross-sectional shape, size, and apex angle of the prism peak 25 exceed the above range, the front luminance is lowered and the viewing angle is narrowed, so that the effect is poor. However, the present invention is not limited thereto, and the above-mentioned prism peaks may have a cross section of other various shapes such as a quadrangle, a pentagon, and an arc. ® Next, the principle of increasing the throughput of the prism peak 25b of the longitudinal waveform and preventing the light coupling will be described in detail with reference to FIG. Referring to Fig. 3, only the surface contact portion C of the upper surface S of the prism sheet 25 is in optical contact with the optical film 30. At this time, the optical film % may be a film included in a polarizing plate (not shown). The actual _cap material is calculated as above, and the length of the material is continuous or discontinuously changed, so that the surface contact portion C of the surface S of the prism peak 25b is smaller than the non-contact portion (ie, except for the c portion). Part s) 200949304 is small. ^b 'A part of the light L1 is emitted from the above-mentioned non-defective portion, and is refracted at the interface between the lenticular lens 25 and the air enthalpy and passes through the air layer A to be incident on the light; the I film 3G_L. Conversely, the remaining small amount of red 2 hardly folds down and passes directly through the surface contact c and the human (4) optical thin, but it is very bright, so the observer does not recognize the transmission characteristics and surroundings of the surface contact c. The field (ie, the air layer A) is different, so the result is that the portion C is abnormal or defective. Further, since the prism peak 25b is designed to have a longitudinal waveform, the optical overlap with the RGB pattern of the liquid crystal display panel (not shown) is reduced or eliminated, and the effect of reducing or preventing the moiré phenomenon is suppressed. At the same time, since the surface contact portion C is extremely small compared with the non-contact portion, it is possible to reduce foreign matter mixed by the surface contact portion C and to reduce the occurrence of marks on the surface contact portion C, thereby reducing the product defective rate as a whole. In addition, since the height of the prism peak 25b is variously changed, the emission position is also variable, so that even if there is a defective user, the user can clearly visually recognize it, so that the defective product can be used without exhaust gas treatment, thereby reducing the product. Bad rate. Hereinafter, the present invention will be described in detail by way of examples, but the invention should not be construed as limited. [Embodiment] For a prism sheet having a structure similar to that of Fig. 2, the following simulation method was carried out, and the change in front luminance of the waveform period with the longitudinal waveform was examined, and the result is shown in Fig. 4. (Using simulation software) 200949304 Optical Research Association's LightTools 6.0 software was used as the software for computer simulation testing. (Parameters for simulation test) • Number of Ray: 3,000,000 Rays • RayPowerThreshold: 0.001 • Source Total Power: 1 lumen • Angular distribution of Source: Lambertian ◎ (prism to be tested) • Length X width: 12.7cm X 8.89cm • Height of prism peak: 24.5~26.5 Liu • Length of the bottom side of the prism peak: 49~53/λπ * Waveform of the longitudinal waveform Period: l, 〇〇〇/zm, l, 5〇〇//m • Refractive index of transparent substrate: 1.667 • Refractive index of prism peak: adjusted in the range of 1.48~1.62 (Increment: 0.03)
©· Reference: 3M公司的 Vikuiti BEF III 10T-22-DIAG 參照圖4可知’隨著縱向波形的波形週期從ιοοομη (棱鏡峰的平均高度：25μιη，上述平均高度的4〇倍）上升 至1’500μιη (上述平均高度的60倍），正面亮度也隨之上 升了。具體說，上述波形週期從棱鏡峰平均高度的4〇倍增 加至60倍時’正面亮度約增加了 1.5%。 如上參照附圖說明了根據本發明的較佳實施例，但這 二僅僅疋舉例，具備本技術領域通常知識的技術人員有可 11 200949304 月b進行多種多樣的變形與等同替換的實施例。因此本發明 的保護範圍應以中請專職圍納容為依據。 —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，任何熟習此技藝者，在不脫離本發明之精神 =範圍内，當可作些許之更動與潤飾，因此本發明之保護 範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】©· Reference: Vikuiti BEF III 10T-22-DIAG of 3M Company Referring to Fig. 4, the waveform period of the vertical waveform is increased from ιοοομη (the average height of the prism peak: 25 μm, 4 times the average height above) to 1'. At 500 μm (60 times the average height above), the front brightness also increases. Specifically, when the above waveform period is increased from 4 〇 times the average height of the prism peak to 60 times, the front luminance is increased by about 1.5%. The preferred embodiment in accordance with the present invention has been described above with reference to the accompanying drawings, but by way of example only, those skilled in the art will be able to carry out various modifications and equivalents. Therefore, the scope of protection of the present invention should be based on the full-time use of the capacity. The present invention has been disclosed in the above preferred embodiments, and it is not intended to limit the invention, and it is possible to make some modifications and refinements without departing from the spirit of the invention. The scope of the invention is defined by the scope of the appended claims. [Simple description of the map]
圖1為顯示具備侧入式光源的背景技術中背光單元的 分離斜視圖。 圖2為顯示根據本發明一實施例的棱鏡片的斜視圖 ★圖3為顯示圖2的棱鏡片與疊加在其上方的其他光; 薄膜的截面圖。 、 1、圖4為對具備與圖2類似結構的棱鏡片進行模擬測 試，從而調查隨縱向波形的波形週期的正面亮度的變化 條形圖。 【主要元件符號說明】BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a separation of a backlight unit in a background art having a side-entry light source. 2 is a perspective view showing a prism sheet according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing the prism sheet of FIG. 2 and other light superimposed thereon. 1, FIG. 4 is a bar graph for performing a simulation test on a prism sheet having a structure similar to that of FIG. 2, thereby investigating a change in front luminance of a waveform period with a longitudinal waveform. [Main component symbol description]
10 背光單元 11 光源 11a 光源罩 12 導光板 13 反射片 14 擴散片 15 棱鏡片 15a, 15b 棱鏡片 12 200949304 16 保護片 25 棱鏡片 25a 透明基板 25b 棱鏡蜂 30 光學薄膜10 Backlight unit 11 Light source 11a Light source cover 12 Light guide plate 13 Reflector 14 Diffuser 15 Prism 15a, 15b Prism 12 200949304 16 Protective sheet 25 Prism 25a Transparent substrate 25b Prism bee 30 Optical film
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