496972 經濟部智慧財產局員Μ消費合作社印製 h寺R月〉丨日修正/先 A7 - B7 五、發明說明（！） [發明背景] [技術領域] 本發明係關於導光板、面光源裝置及顯示裝置，尤其 是關於一種自隅角部輸入光之型式的導光板，和使用改良 成如此之導光板的面光源裝置，以及使該面光源裝置用於 液晶顯示板之照明的顯示裝置。本發明適用於如附設在行 動電話的液晶顯示裝置，在該液晶顯示裝置所使用的面光 源裝置及導光板。 [相關技術] 由面光源裝置照明液晶顯示裝置的液晶顯示板乃為眾 所週知之技術。一般而言，面光源裝置具備導光板和將一 次光供給於該導光板的一次光源。以往，對於一次光源而 言，一直是廣泛使用棒狀的螢光燈（冷陰極管），但近年逐 漸採用一種利用如LED(發光二極體，·以下相同）的點狀至 局部的發光源。 尤其是在具有附設於如行動電話的小型機器之較小顯 示螢幕的液晶顯示裝置中，利用led之點狀或局部發光源 逐漸成為主流。 在第10圖，以分解斜視圖顯示以利用局部發光源的習 用面光源裝置照明液晶顯示板的液晶顯示裝置之一例。而 且’在第11圖顯示沿面光源裝置之線B_B的剖面構造。 參閱兩圖，液晶顯示裝皇1具有以面光源裝置3照明 的液晶顯示板2。面光源裝置3具備導光板6, LED(點狀 光源）8，反射片5。導光板6具有大致楔形狀的剖一 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 312205 裝·-------訂---------線 (請先閱讀背面之沒意事項再填寫本頁) 1 496972 A7 各年丨乙/4 W修正充496972 Member of the Intellectual Property Bureau of the Ministry of Economic Affairs, M Consumer Cooperative printed H Temple R Month> 丨 Day Amendment / First A7-B7 V. Description of the Invention (!) [Background of the Invention] [Technical Field] The present invention relates to light guide plates, surface light source devices, and A display device, in particular, relates to a light guide plate of a type for inputting light from a corner, a surface light source device using such a light guide plate, and a display device using the surface light source device for illumination of a liquid crystal display panel. The present invention is applicable to a liquid crystal display device attached to a mobile phone, a surface light source device and a light guide plate used in the liquid crystal display device. [Related Technology] It is a well-known technique to illuminate a liquid crystal display panel of a liquid crystal display device with a surface light source device. Generally, a surface light source device includes a light guide plate and a primary light source that supplies primary light to the light guide plate. In the past, for primary light sources, rod-shaped fluorescent lamps (cold-cathode tubes) have been widely used, but in recent years, a point-to-local light source using LEDs (light emitting diodes, the same below) has been gradually adopted. . Especially in a liquid crystal display device having a small display screen attached to a small device such as a mobile phone, a dot-shaped or local light emitting source using LEDs has gradually become the mainstream. In Fig. 10, an example of a liquid crystal display device is shown in an exploded perspective view to illuminate a liquid crystal display panel with a conventional surface light source device using a local light source. Further, Fig. 11 shows a cross-sectional structure along a line B_B of the surface light source device. Referring to both figures, the liquid crystal display device 1 has a liquid crystal display panel 2 illuminated by a surface light source device 3. The surface light source device 3 includes a light guide plate 6, an LED (point light source) 8, and a reflection sheet 5. The light guide plate 6 has a substantially wedge-shaped section. A paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm). 312205 (Please read the unintentional matter on the back before filling out this page) 1 496972 A7 each year 丨 B / 4 W correction charge
五、發明說明（ 方的主面形成出射面6B’另一方的主面形成背面Μ。而 且’導光板6在其較厚側的端部具有以大致〇度的傾 經濟部智慧財產局員工消費合作社印製 斷的形狀’以連結出射面⑽和背面6Α。此傾斜面則 内部反射面6C。 反射板5係由例如白色ΡΕΤ薄臈所成用來反射從背 漏出的光線以使其返回導光板6内而防止光線的 損失。而且’藉由亂反射產生朝多樣方向傳播的光線，以 促進光線從出射面6Β的出射。 LED8係視所需要的亮度配置有丨個或多數個，並以 全體構成一次光源。在本例係以等間隔配置4個。如 第π圖所示，這些LED8係配置於内部反射面6C的大致 正下方，並且通過光入射面6D朝内部反射面6C供給—次 光。在這裡，光入射面6D係由背面6A的緣部所形成的帶 狀面領域，且在該緣部的前端與内部反射面6(：相會而形 成一條邊緣線。 如果點亮LED8，光線即通過光入射面6D導入於導光 板6内。大部份被導入的光線會内部入射於内部反射面 6C。然後，内部入射光的大部份會在内部反射面6(：進行 内部反射，並且實施大致90度的方向轉換。在内部反射面 6C内部反射的光線全體係沿著從内部反射面6c或緣部遠 離的方向傳播於導光板6内。 如眾所熟知，在此過程係一面進行利用背面6A，出射 面6B的内部反射，利用反射板5的反射（從背面6A洩漏 後）等’ 一面從出射面6B緩慢產生出射。此出射光（照明輸 --------訂---------^ IAWI ftt先閱讀背面之注音？事項再填寫本頁} 本纸張尺度適用中國國家標準（CNS)A4規格（210 X 297公Ϊ ) 2 312205 496972 經濟部智慧財產局員工消費合作社印剩衣 。㈣湘叙 B7 五、發明說明（3 ) 出）可利用於液晶顯示板2的照明。 .此外，為促進從出射面6B的出射，可視需要 而戈' ϊ朱用在 出射面6B形成多數的微小粗面化領域（所謂光散亂圖 案），或將出射面6B全體加以粗面化等的手段。 在以上所說明的習用技術中成為問題的是，與導光板 6的規格相較，由於各個光源（Led)8的發光面積小，因此 在出射面6B的亮度容易產生顯著的不均勻。亦即，如第 12圖所示，在出射面6B中會對應於各LED8而出現亮部（參 閱虛線），另一方面在亮部和亮部的中間及隅角部會出現心 部（亮度不足部份）。 此問題雖只要密集配置多數的LED8即可緩和，彳曰是 將會使配線構造複雜化，在經濟上並非有利。 而且，沿内部反射面6C配置可發射出擴張角度大的 光之一次光源，例如擁有發散性出射角度特性的LED8 時，也可緩和亮度不均勻。 但在此技巧中，會增加朝導光板6入射時的入射角大 的光成份。而且，如果依光學的知識所教導，從低折射率 媒體（空氣）朝高折射率媒體（透光性樹脂等）的入射角越 大，光的介面滲透率（朝導光板内的引進率）與垂直入射相 比會越低。因此，依賴此技巧想解決上述問題有其困難。 並且’亦可對於前述光散亂圖案之出射促進能力因應 於部位給予強弱，藉此緩和亮度不均勻。如果依此技巧， 在容易造成亮度不足的部份（亮部和亮部之間及隅角部）係 設定較高的微小粗面領域的密度，在亮部則設定較低的密 裝·-------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 本纸張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 3 312205 外 6972 年/2λι 胗正产更正y,充V. Description of the invention (The main surface of the square forms the exit surface 6B. The cooperative prints a broken shape 'to connect the exit surface ⑽ and the back surface 6A. This inclined surface is an internal reflection surface 6C. The reflection plate 5 is made of, for example, a white PET thin film to reflect the light leaking from the back and return it to the guide. The light plate 6 prevents the loss of light. Furthermore, the light is propagated in various directions by the random reflection to promote the light from the exit surface 6B. The LED8 series is equipped with one or more of the required brightness, and The whole constitutes a primary light source. In this example, four are arranged at equal intervals. As shown in Figure π, these LEDs 8 are arranged approximately directly below the internal reflection surface 6C, and are supplied to the internal reflection surface 6C through the light incident surface 6D— Secondary light. Here, the light incident surface 6D is a band-shaped area formed by the edge portion of the back surface 6A, and the front end of the edge portion meets the internal reflection surface 6 (: to form an edge line. If lit LED8 The light is introduced into the light guide plate 6 through the light incident surface 6D. Most of the introduced light will be incident internally on the internal reflection surface 6C. Then, most of the internal incident light will be internally reflected on the internal reflection surface 6 (: internal reflection And implement a direction conversion of approximately 90 degrees. The entire system of light reflected inside the internal reflection surface 6C propagates into the light guide plate 6 in a direction away from the internal reflection surface 6c or the edge. As is well known, in this process, One side performs internal reflection using the back surface 6A, the exit surface 6B, and the reflection from the reflection plate 5 (after leaking from the back surface 6A), etc., and one side slowly emits light from the exit surface 6B. This outgoing light (lighting output ------- -Order --------- ^ IAWI ftt first read the phonetic on the back? Matters and then fill out this page} This paper size is applicable to China National Standard (CNS) A4 (210 X 297 cm) 2 312205 496972 Economy Employees of the Intellectual Property Bureau of the Ministry of Intellectual Property Co., Ltd. printed leftover clothes. Bianxiang Xu B7 V. Description of Invention (3) can be used to illuminate the liquid crystal display panel 2. In addition, in order to promote the emission from the emission surface 6B, it can be used as needed. '' Zhu Zhu is formed on the exit surface 6B Many micro-roughened areas (so-called light scattering patterns), or roughening the entire exit surface 6B, etc. It is a problem in the conventional technology described above that it is compared with the specifications of the light guide plate 6 Since the light emitting area of each light source (Led) 8 is small, the brightness of the emitting surface 6B is likely to be significantly uneven. That is, as shown in FIG. 12, the emitting surface 6B will appear bright corresponding to each LED 8. (See the dotted line), on the other hand, the heart (the lack of brightness) will appear in the middle of the bright part and the corner and the corner part. Although this problem can be alleviated by densely arranging a large number of LED8, it will be It is not economically advantageous to complicate the wiring structure. Furthermore, when a primary light source that emits light with a large expansion angle is arranged along the internal reflection surface 6C, for example, the LED 8 having a divergent emission angle characteristic can also reduce uneven brightness. However, in this technique, a light component having a large incident angle when entering the light guide plate 6 is increased. Moreover, if taught by the knowledge of optics, the larger the angle of incidence from the low-refractive index medium (air) to the high-refractive index medium (transparent resin, etc.), the higher the interface permeability of light (the introduction rate into the light guide plate). It will be lower compared to normal incidence. Therefore, it is difficult to rely on this technique to solve the above problems. Furthermore, the emission promotion ability of the aforementioned light scattering pattern can be given strength or weakness depending on the site, thereby reducing uneven brightness. If you follow this technique, set the density of the micro-rough areas to be higher in the parts that are prone to lack of brightness (between the bright part and the bright part and the corner part), and set the lower dense packing in the bright part.- ------ Order --------- Line (Please read the precautions on the back before filling this page) This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 3 312205 outside 6972 years / 2λι
五、發明說明（4 ) A7r- B7 度。 但’利用此光散亂圖案的技巧具有㈣用。亦即，為 了解決亮度不；1而以高密度形成微小粗面領域時即降低 該部份的視覺上之品質’且將會感到所謂的「閃爍」。而且： 也會發生以形成微小_面㈣的領《和盆他領域的 交界明顯的現象。這種副作用，會破壞面光源裝置或内部 裝有該面光源裝置的液晶顯示裝置的商品價值’例如裝設 於行動電話時，將造成被消費者謝絕的原因。 又 [發明目的及概要] 於是，本發明的目的在於提供一種解決上述問題後的 面光源裝置，顯不裝置及其所使用之改良的導光板。具體 來說，本發明係改良導光板以期可由來自少量點狀光源（表 不使用代表LED之局部發光設備的光源）的光輸入容易地 將出射面的亮度加以均勻化，並將此導光板用於面光源裝 置及顯示裝置來解決上述問題者。 本發明首先係改良一種具有用來輸出光線的出射面， 背向前述出射面的背面，以及實施光輸入的至少一個光輸 入隅角部的導光板。 在按照本發明改良後的導光板中，前述光輸入隅角部 具有「斜切的形狀」，且從前述光輸入部導入於前述導光板 内的光線係以從前述光輸入隅角部遠離的方式進行傳播。 在典型的形態中，上述「斜切的形狀」包含相對於前 述出射面及前述背面而傾斜的内部反射面，從前述光輸入 部導入於前述導光板内的光線在前述内部反射面内部反射 312205 r ---------訂---------線 IAW. (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 表紙張尺度適用中國國家標準（CNS)A4規格（21〇 X 297公餐） 496972 經濟部智慧財產局員工消費合作社印製 5 --*-- ~~---------- 五、發明說明（5 ) 以後，係以從前述光輸入隅角部遠離的方式進行傳播。 依此改良’如果在内部反射面的内部反射以後以較狹 窄角度範圍（通常90度）擴張的方式供給一次光，光線即幾 乎遍布在導光板内，且出射面的亮度可容易地均句化。 這種特徵並未見於沿導光板6的一邊配置一次光線 (LED8)的習用技術（參閱第10圖至第12圖）。因為在習用 技術中’除非在内部反射面6C的内部反射以後以較寬的 角度乾圍（通常大致180度）的方式供給一次光，否則光線 不能遍布在導光板内。 在這裡’一次光的入射亦可透過對應於導光板背面隅 角部的部份所形成的光入射面實施。而且，在隅角部裝設 從導光板背面突出的入射光引導部，並透過它實施光入射 也可以。 其次本發明適用於包括至少一個一次光源，和導光板 的面光源裝置。在這裡，對於導光板而言可使用上述經過 改良的導光板。亦即，導光板具有用以輪出光線之出射面、 背向前述出射面之背面，以及實施由一次光源所供給之光 線之輸入的至少一個光輸入部。 前述光輸入隅角部具有斜切的形狀，前述一次光源的 放出光在前述光輸入隅角部導入於前述導光板内以後，以 擴張於前述導光板内的方式進行傳播。在典型的形熊中， 上述「斜切的形狀」包含相對於前述出射面及前述背面而 傾斜的内部反射面，且從前述光輸入部導入於前述導光板 内的光線在前述内部反射面進行内部反射以後，係以從前 i紙張尺度適用中國國家標準（CNS)A4規格（21〇x 297公釐） '---- 312205 --------------裝--------訂---------線 f請先閱讀背面之注意事項再填寫本頁) 496972 經濟部智慧財產局員工消費合作社印製 和年d 修正/爾充 _ B7 五、發明說明（6 ) 述光輸入隅角部遠離的方式進行傳播。 例如，在光輸入隅角部的附近，若配置朝用以使光路 彎曲的内部反射面發出具有某程度之行進方向的擴張角度 的光之LED，即可使光線幾乎遍布於導光板内。 在這裡，一次光的入射亦可透過對應於導光板背面隅 角部的部份所形成的光入射面實施。而且，在光輸入隅角 部裝設從導光板背面突出的入射光引導部，並透過它實施 光入射也可以。一次光源配置於光入射面的附近或入射光 引導部前端的適當部位。 如果為照明液晶顯示板而配置如上述改良後的面光源 裝置，即構成顯示裝置。不限於背面照明型，以前面照明 的形態配置面光源裝置也可以。經過改良的面光源裝置的 上述特徵也反映於顯示裝置。亦即’使用對應於光輸入隅 角部而裝設的少數一次光源（典型的是LED)，可對於導光 板的出射面全體提供大致均勻的亮度，並且透過它可抑制 顯示裝置的顯示螢幕的明暗不均。此時，不需要如習用技 術的高密度光散亂圖案，因此，可避免因它所引起的「閃 爍」。 [圖式簡單說明] 第1圖係以分解斜視圖顯示本發明第1實施例的液晶 顯示裝置的全體概略配置。 第2圖係以從出射面側觀察的平面圖（a)，以及沿線 Α-Α的剖面圖（Β)顯示第1圖所示的實施例所採用的導光 板0 IL--------------------訂 --------線 (請先閱讀背面之;!.意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210x 297公餐） 6 312205 五、發明說明（7 修正咬賴恍 第3圖係以從出射面側觀察的平面圖顯 例 所採用的導光板。 Λ J 第圖係以從出射面側觀察的平面圖顯#第^ 所採用的導光板。 第5圖係以從出射面側觀察的平面 所採用的導光板。 圖顯示第4實施例 第6圖係以斜視圖顯示第5實施例所採用的導光板的 入射光引導部。 第7圖係形成於導光板的内部反射面變形例的平面 圖。 第8圖係形成於導光板的内部反射面另一 剖面圖。 個變形例的 視圖 第9圖係對於適用在前面照射型之情形加以說明的斜 經濟部智慧財產局員工消費合作社印製 第10圖係以斜視圖顯示液晶顯示裝置，該裝置係以利 用局部發光源的習用面光源裝置照明液晶顯示板者。 第11圖係對於第10圖所示的習用面光源裝置，顯示 沿線A_A剖面的剖面圖。 第12圖係說明有關第10圖、第Π圖所示習用例的出 射面上亮度不均勻的平面圖。 [符號簡單說明] 1，Π液晶顯示裝置 2 液晶顯示板 3，13面光源裝置 6，16,26,36,46導光板 6A，16A導光板的背面 6B，16B，26B導光板的出射面 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公餐） 7 312205 -------------裝.-------訂---------線 (請先閱讀背面之注音)事項再填寫本頁) 496972 6D，16D，26D導光板的光入射面 19 可撓性基板 A7 B7 五、發明說明（8 ) 6C，16C内部反射面 8，18LED(發光二極體） [實施例] 兹參閱第1圖至第1〇圖說明本發明的實施例如下。此 外’在各圖中’為容易理解，適當誇張而顯示各要素的尺 寸、形狀等。而且，對於和第圖至第12圖共通使用的 要素附加共通的符號，並適當省略重複的說明。 第1實施例 首先參閱第1圖，該圖顯示本實施例的顯示裝置（液晶 顯示裝置）的概略構造。液晶顯示裝置n係適用於如行動 電話的顯不器者’且具備從背後照明液晶顯示板2的面光 源裝置13。 面光源裝置13具備導光板16, LED(點狀光源）18，反 射片5。導光板16係由例如丙烯酸樹脂（pMMA樹脂等）或 ί哀烯烴系樹脂所成的透光性構件，除後述内部反射面的部 份以外，具有大致均勻的厚度。導光板16係使一方的主面 形成出射面16Β，使另一方的主面形成背面16Α。 第2圖係以從出射面側觀察的平面圖（Α)顯示第ί圖所 不實施例所採用之導光板，以及以沿線Α_Α的剖面圖 顯不該導光板者。從這些圖即可明白，導光板16具有大致 矩形的全體形狀，且在其一邊的兩端隅角部，具備可連結 出射面16Β和背面16Α的内部反射面16(：。在本實施例， 這兩個隅角部形成光輸入隅角部。 内部反射面16C相當於將導光板16 一邊的兩端隅角 本紙張尺度適用中國國豕標準（CNS)A4規格（210 X 297 ^ ^ ------------t--------tr---------線φ· (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 312205 496972 經濟部智慧財主局員工消費合作社印製 Ά V曰修正/更正六|.充〜 Β7 -------- 五、發明說明（9 ) 部斜切之形狀的斜面9内部反射面16C的邊緣相對乂 W則述 —邊形成角度0 1。。而且，内部反射面1 6C相對於出射 面16Β及背面16Α形成角度分別呈0 2的斜面。角度0 1 的典裂單聲約45度，實際的範圍係45度士15度左右（約3〇 度翼60度)。而角度0 2的實際範圍係約45度至約2〇产 的範圍。角度、0 2最妤在實際的範圍中選擇。 在本實施例因斜切形狀，背面16Α的規格略大於出射 面16Β的規格。一般而言，配置一次光源1 8側的主面， 略大於另一方主面。從内部反射面16C的功能（内部反射所 致的光路彎曲）來看這是當然的事情。 在第2圖（Α)中所示的矩形虛線表示本實施例中的有 效發光領域，液晶顯示板2的顯示螢幕的規格係和此有效 發光領域相同，或略小於此領域。 對應於各内部反射面16C’背面16Α的一部份形成光 入射面16D。如第2圖（Β)所示，一次光源（LED)18係配置 成朝這些光入射面16D放出光線。換言之，在各光輸入隅 角部中，内部反射面16C，光入射面16D，LED18係大致 沿著導光板6的厚度方向排列。 並且，如在習用技術所說明，在出射面丨6B上，可視 需要开> 成為促進出射的先散亂圖案。但不容易產生必需極 端加大光散亂圖素之出射促進能力（例如依賴微小粗面化 領域的覆蓋密度）的區域。因為如果隅角部以大致9〇度的 擴張角度將光線送入導光板16内，光線很容易在矩形的導 光板16内被布，所以不容易產生光量不足傾向很強的區 ϋ n n ϋ i· ϋ ϋ I n n I · I n n I —I- lii i 一 .of a ·1 · m II -1-1 a n I (請先閱讀背面之注意事項再填寫本頁) 本紙張κ糾fl巾關家料（CNS)A4驗（21〇 χ 297公f 9 312205 496972 +年月外日修正充5. Description of the invention (4) A7r- B7 degrees. But the technique of using this light scattering pattern is useful. That is, in order to solve the problem of brightness; 1, when a micro-rough area is formed at a high density, the visual quality of the portion is reduced 'and the so-called "flicker" will be felt. And: It will also happen that the obvious phenomenon of the border with the other fields is formed to form a small face. Such a side effect may destroy the commercial value of a surface light source device or a liquid crystal display device in which the surface light source device is installed, for example, when it is installed in a mobile phone, which may cause a rejection by consumers. [Objective and Summary of the Invention] Accordingly, an object of the present invention is to provide a surface light source device, a display device, and an improved light guide plate used therefor after solving the above problems. Specifically, the present invention is to improve the light guide plate so that the light input from a small number of point light sources (representing the use of a local light emitting device representing LEDs) can easily uniformize the brightness of the exit surface, and use the light guide plate The above-mentioned problems are solved by a surface light source device and a display device. The present invention first improves a light guide plate having an exit surface for outputting light, a back surface facing away from the exit surface, and at least one light input corner portion for performing light input. In the improved light guide plate according to the present invention, the light input corner portion has a "beveled shape", and the light introduced from the light input portion into the light guide plate is away from the light input corner portion. Way to spread. In a typical form, the "beveled shape" includes an internal reflection surface inclined with respect to the exit surface and the back surface, and light introduced into the light guide plate from the light input portion is reflected inside the internal reflection surface 312205. r --------- Order --------- line IAW. (Please read the precautions on the back before filling out this page) The scale of paper printed by the employee consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs applies China National Standard (CNS) A4 Specification (21 × X 297 Meals) 496972 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5-*-~~ ---------- V. Description of Invention ( 5) In the future, the propagation is performed away from the corner of the light input corner. Improved according to this' If the internal reflection of the internal reflection surface is supplied in a narrow angle range (usually 90 degrees) after the primary light is supplied, the light is almost spread throughout the light guide plate, and the brightness of the output surface can be easily equalized . This feature is not seen in the conventional technique of arranging primary light (LED8) along one side of the light guide plate 6 (see FIGS. 10 to 12). Because in conventional technology, 'unless the light is supplied once at a wide angle (usually approximately 180 degrees) after the internal reflection of the internal reflection surface 6C, the light cannot be spread throughout the light guide plate. Here, the incidence of primary light can also be performed through a light incident surface formed at a portion corresponding to a corner portion of the back surface of the light guide plate. It is also possible to install an incident light guide portion protruding from the rear surface of the light guide plate at the corner portion, and transmit light incident therethrough. Secondly, the present invention is applicable to a surface light source device including at least one primary light source and a light guide plate. Here, for the light guide plate, the improved light guide plate described above can be used. That is, the light guide plate has at least one light input portion for emitting light, a back surface facing away from the above-mentioned light emitting surface, and inputting light rays supplied from the primary light source. The light input corner portion has a chamfered shape, and the light emitted by the primary light source is introduced into the light guide plate after the light input corner portion is introduced, and spreads in the light guide plate. In a typical shaped bear, the "beveled shape" includes an internal reflection surface that is inclined with respect to the exit surface and the back surface, and light introduced into the light guide plate from the light input portion is performed on the internal reflection surface. After internal reflection, it is based on the previous Chinese paper standard (CNS) A4 specification (21 × 297 mm) '---- 312205 -------------- install- ------ Order --------- Line f, please read the notes on the back before filling out this page) 496972 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs and the year d correction / Ercharge _ B7 V. Description of the invention (6) The light input corners are far away from each other for propagation. For example, if an LED is disposed near the corner of the light input to emit light having an expansion angle toward the internal reflection surface that bends the optical path, the light can be spread almost in the light guide plate. Here, the incident light may be transmitted through a light incident surface formed at a portion corresponding to a corner portion of the back surface of the light guide plate. Furthermore, an incident light guide portion protruding from the rear surface of the light guide plate may be provided at the corner of the light input, and light may be incident through the incident light guide portion. The primary light source is arranged in the vicinity of the light incident surface or an appropriate portion of the front end of the incident light guide. If an improved surface light source device as described above is provided for illuminating a liquid crystal display panel, a display device is constituted. It is not limited to the back-illuminated type, and the surface light source device may be arranged in the form of front-illuminated. The above characteristics of the improved surface light source device are also reflected in the display device. That is, 'the use of a small number of primary light sources (typically LEDs) installed corresponding to the corners of the light input can provide approximately uniform brightness to the entire exit surface of the light guide plate, and through it can suppress the display screen of the display device. Light and dark uneven. At this time, the high-density light scattering pattern like the conventional technique is not needed, and therefore, the “flicker” caused by it can be avoided. [Brief Description of the Drawings] Fig. 1 is an exploded oblique view showing the overall configuration of a liquid crystal display device according to a first embodiment of the present invention. Figure 2 is a plan view (a) viewed from the exit surface side, and a sectional view (B) along the line A-A shows the light guide plate 0 IL used in the embodiment shown in Figure 1 ------- ------------- Order -------- line (please read the back of the first;!. Intentions before filling out this page) This paper size applies to China National Standard (CNS) A4 Specifications (210x 297 meals) 6 312205 V. Description of the invention (7 Correction bite Figure 3 is a light guide plate used in a plan view example viewed from the exit surface side. Λ J Figure is viewed from the exit surface side The plan view shows the light guide plate used in # 第 ^. Figure 5 is a light guide plate used in a plane viewed from the exit surface side. The figure shows the fourth embodiment. Figure 6 shows a perspective view of the fifth embodiment. FIG. 7 is a plan view of a modified example of the internal reflection surface of the light guide plate. FIG. 8 is another sectional view of the internal reflection surface of the light guide plate. A view of the modification 9 The figure is an oblique illustration of the front-illuminated type. It is printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. The figure shows a liquid crystal display device, which is a device for illuminating a liquid crystal display panel with a conventional surface light source device using a local light source. FIG. 11 is a cross-sectional view showing the conventional surface light source device shown in FIG. 10 along a line A_A. Fig. 12 is a plan view illustrating the uneven brightness on the emission surface of the use case shown in Figs. 10 and Π. [Simplified description of symbols] 1, LCD liquid crystal display device 2, liquid crystal display panel 3, 13 surface light source device 6, 16 , 26,36,46 Light guide plate 6A, 16A back side of light guide plate 6B, 16B, 26B light guide plate exit surface This paper size applies to China National Standard (CNS) A4 specifications (210 x 297 meals) 7 312205 ---- --------- Installation .------- Order --------- line (please read the note on the back) before filling this page) 496972 6D, 16D, 26D guide Light incident surface of the light plate 19 Flexible substrate A7 B7 V. Description of the invention (8) 6C, 16C Internal reflection surface 8, 18 LED (light emitting diode) [Example] Please refer to FIGS. 1 to 10 to explain this Examples of the invention are as follows. In addition, "in each figure" is easy to understand, and the size and shape of each element are shown exaggerated as appropriate. In addition, elements common to those in Figs. 12 to 12 are given the same reference numerals, and redundant descriptions are appropriately omitted. First Embodiment Referring first to FIG. 1, a schematic configuration of a display device (liquid crystal display device) of this embodiment is shown. The liquid crystal display device n is a surface light source device 13 which is suitable for a display device such as a mobile phone ', and which illuminates the liquid crystal display panel 2 from the back. The surface light source device 13 includes a light guide plate 16, an LED (point light source) 18, and a reflective sheet 5. The light guide plate 16 is a light-transmitting member made of, for example, an acrylic resin (pMMA resin or the like) or an olefin-based resin, and has a substantially uniform thickness except for a portion of an internal reflection surface described later. The light guide plate 16 is formed such that one main surface forms an emission surface 16B and the other main surface forms a rear surface 16A. Fig. 2 is a plan view (A) viewed from the exit surface side, showing the light guide plate used in the embodiment shown in Fig. 1 and a sectional view along line A_A showing the light guide plate. As can be understood from these figures, the light guide plate 16 has a substantially rectangular overall shape, and at both corner portions of one side thereof, is provided with an internal reflection surface 16 (: that can connect the emission surface 16B and the back surface 16A: In this embodiment, These two corners form the corners of the light input. The internal reflecting surface 16C is equivalent to the corners at both ends of one side of the light guide plate 16. This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 ^ ^- ---------- t -------- tr --------- line φ · (Please read the notes on the back before filling this page) Intellectual Property Bureau of the Ministry of Economic Affairs Printed by an employee consumer cooperative 312205 496972 Printed by an employee consumer cooperative of the Smart Treasurer Bureau of the Ministry of Economic Affairs V. Correction / Correction VI |. Charge ~ Β7 -------- V. Description of the invention (9) Part of the oblique cut shape The edges of the internal reflection surface 16C of the inclined surface 9 are described with respect to 乂 W—the sides form an angle of 0 1. Moreover, the internal reflection surface 16C forms inclined surfaces with an angle of 0 2 with respect to the exit surface 16B and the rear surface 16A. The cracking sound is about 45 degrees, and the actual range is about 45 degrees ± 15 degrees (about 30 degrees and 60 degrees wing). The actual range of angle 0 2 is about 45 degrees to The range of production is 20. The angle and the maximum value of 0.2 are selected in the actual range. In this embodiment, due to the beveled shape, the specifications of the back 16A are slightly larger than the specifications of the exit surface 16B. Generally, the primary light source is configured on the 18 side. The main surface is slightly larger than the other main surface. Judging by the function of the internal reflection surface 16C (the bending of the optical path caused by internal reflection), this is a matter of course. The rectangular dotted line shown in Figure 2 (A) indicates this In the effective light-emitting area of the embodiment, the specifications of the display screen of the liquid crystal display panel 2 are the same as or slightly smaller than this effective light-emitting area. A portion corresponding to each of the internal reflection surfaces 16C ′ and the rear surface 16A forms a light incident surface 16D. As shown in FIG. 2 (B), the primary light source (LED) 18 is configured to emit light toward these light incident surfaces 16D. In other words, in each corner of the light input, the internal reflection surface 16C and the light incidence surface 16D, The LED18 series are arranged approximately along the thickness direction of the light guide plate 6. Also, as explained in the conventional technology, the exit surface 6B can be turned on as necessary to become a pre-scattering pattern that promotes emission. Areas where the light scattering pixels have an emission promotion ability (for example, depending on the coverage density of the micro-roughened area). Because if the corners send the light into the light guide plate 16 at an expansion angle of approximately 90 degrees, the light can easily pass through The rectangular light guide plate 16 is clothed, so it is not easy to generate a region with a strong tendency of insufficient light quantity ϋ nn ϋ i · ϋ ϋ I nn I · I nn I —I- lii i i.of a · 1 · m II -1- 1 an I (Please read the precautions on the back before filling this page) This paper κ correction fl towel Guan Jialian (CNS) A4 inspection (21〇χ 297 公 f 9 312205 496972
五、發明說明（10 ; 經濟部智慧財產局員工消費合作社印製 域。此外，也有取代光散亂圖案而將出射面16B全體加以 粗面化以促進出射的情況。 這種導光板16和反射片5皆收容於未圖示的框架，且 安裝於配線基板17上的規定位置。在配線基板17上裝設 有驅動如行動電話所裝設的液晶顯示裝置11之液晶顯示 板2所用的積體電路，或為驅動ledi8的電路。 LED18本身也安裝於配線基板17上。LEm8的安裝 位置和安裝姿勢係以其放出光不浪費地入射於光入射面 16D的方式而選擇。並且如果詳細地說，對於放出光的主 要行進方向和内部反射面16C的面方位（角度01、02)的 關係或放出光的指向性的強度（朝向光入射面16D時之行 進方向的角度上的擴張程度）最好加以考慮。亦即，最好考 慮上述角度01、02或放出光的指向性的強度，而設定 LED18的安裝位置和安裝姿勢以使光線可儘量均勻地遍及 出射面16B全體。尤其是，在由於内部反射面16的内部 反射時最好不要出現大的滲透損失。因此，只要調整安裝 角度，使放出光的大部份於内部反射時有空間滿足全反射 條件即可。 因此’ LED 18的安裝姿勢不一定要和光入射面16D正 對’亦可形成放出光的主要行進方向相對於背面16A或出 射面16B而傾斜規定角度。 並且，在安裝LED18時，最好對於放出光的指向性的 強度（行進方向的角度上的擴張程度），注意是否具有縱橫 方向的差。亦即，如第1圖所示，以具有長短軸的長方體 本，·氏浪又度適用中國國家標準（CNS)a4規格（210 x 297公釐） IK-------------------訂·-------- (請先閱讀背面之注音)事項再填寫本頁) 312205 496972 A7 B7 曰修正 五、發明說明（U ) 形狀的組件構成LED 18時，放出光的擴張係長軸方向較短 軸方向為大。換言之，光入射面16D上的等入射強度線會 形成同心橢圓形狀（橢圓的長軸方向和組件的長轴方向平 行）。因此，在安裝LED 18時，如第1圖所示，最好將長 轴方向設定為和内部反射面16C的邊緣平行。 此外，對於積體電路和液晶顯示板2之間的電性連接 係使用可撓性基板19，但對於這些電性連接構造，由於和 本發明的要旨沒有特別關係因此不再詳細說明。 茲說明如上述構成的液晶顯示裝置11中的光線之行 進方式。如果點亮LED18，光線即通過光入射面16D導入 於導光板16内。所導入的大部份光線係内部入射於内部反 射面16C而進行内部反射。内部入射時的入射角大於臨界 角的成份會被全反射。被全反射的成份越多，從内部反射 面16C的漏光就越少。在這裡，如上所述，角度(參閱 第2圖（Β))和LED1 8的安裝姿勢（放出光的出射方向）係考 量此點而規定。 如上述有效地輸入於導光板16而轉換方向的光線，係 以朝經過擴張的行進方向離開内部反射面16c的方式傳播 於導光板16内部。 在這裡’應注意的是，内部傳播的方向和背面16八及 出射面16B不平行的大部份成份，在内部傳播的過程係反 複内部入射於背面16A及出射面16B。出射面ΐ6β為鏡面 時’内部入射時的入射角低於臨界角的—部份成份會從出 射面16B出射。而且，欲對於出射面16B，藉由前述光散亂 本紙張尺度適用中國國家標準（CNS)A4規格（21〇 x 297公餐） 312205 -ϋ n n m n I I an n I * ft— n n n n an ϋ · «1— n in ϋ I I ·ϋ I 言 为 (請先閱讀背面之沒音？事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 11 496972 經濟部智慧財產局員工消費合作社印製 6年V»] 日修正/务士片^^ .A7 ----------^L· __ 五、發明說明（12 ) 圖案或全面粗面化以促進出射時，係因應於此而促進出射。 從這種出射機構來看，在内部反射面16C中的内部反 射後的LED18的放射光的主要行進方向，並不是和出射面 16B平仃，最好與出射面16β傾斜小角度。此傾斜角度最 好透過角度Θ 2(參閱第2圖⑻）和LED18的安裝姿勢的關 係的調整，而以設計方式規定。 一般而言，如果此傾斜角度過大，光線即不容易到達 遠離内部反射面1 6C的部份，如果過小，出射強度即在内 部反射面16C的附近降低。此外，從背面16八出射的光線， 係由反射片5反射，而回到導光板16内，之後提供於出射 面16B内部入射的機會。 因此從出射面16B出射的光線可供給於液晶顯示板 2。從背面照射的液晶顯示板2係由裝設於配線基板丨7的 驅動電路驅動，並且以周知的形態顯示畫像。 如從上述說明即可明白，和習用技術（參閱第1〇圖至 第12圖）不同，由於係從隅角部供給光線，因此儘管提供 給内部傳播光之行進方向的擴張角度狹窄，仍容易使光線 大致均句地遍及導光板16内。在導光板16屬於略矩形的 典型情形下’内部傳播光的行進方向的擴張角度只要有90 度左右即可。相對地習用技術之情況下，要求接近180度 的擴張角度，實際上相當困難。 其令’第11圖中所繪示的複數箭頭，係概念性地表現 光從出射面之射出，並不特別表示平行光束的射出。不過， 若為導光板背面設有多數微反射器（micro reflector)的類 S - --------訂---------線 一(請先閱讀背面之;1音？事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格⑵Q X 297公餐） 12 312205 /2 /2 經濟部智慧財產局員工消費合作社印製 A7 /年月方曰修正 五、發明說明（13 ) 型’則可得到向正面方向的指向性強（接近平行光束）的 光。 並且’不再需要如以往（參閱第10圖）沿導光板邊緣配 置一次光源（LED 18)，因而可在這裡產生空間的餘裕。如 第1圖所示，此空間可有效運用來使可撓性基板19容易地 通過。這在例如行動電話的構造設計上具有極大的意義。 亦即’在習用構造（第10圖）中，由於可撓性基板19必須 以不遮敝LED18光線的方式配設，因此如第1〇圖中虛線 所不’可撓性基板19 一旦從液晶顯示板抽出於導光板的左 右側方，即從該處通過導光板的左右側部而在配線基板的 附近和驅動電路連接。因此，具有所謂行動電話的橫向寬 度遠較顯示器的寬度為大的問題。 相對地在本實施例所例示的本發明，係從液晶顯示板 2抽出可撓性基板19，並且通過導光板ι6的前後側部（相 當於在第10圖排列有LED8的部位）而繞進背面16A側， 因而可達成和驅動電路的連接。因此，可縮小行動電話的 橫向寬度（和顯示器的橫向寬度大致一致 以上是第1實施例的概要，但關於朝導光板輸入光線 的隅角部之形態可進行各種的變形。茲說明其幾項變形例 如下：此外，說明係僅對於實施光輪入的隅角部形態來進 行，並不重複和第1實施例共通性高的事項說明。 名2實施你丨 在本實施例，導光板可採用第3圖所示的導光板26。 如該圖所示’導光板26之兩個隅角部係形成斜切的形狀並 -------------裝·-------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 13 312205 經濟部智慧財產局員工消費合作社印製 496972 , … Α7 --------—___J7______ 五、發明說明（14 ) 且以此作為光輸入部，但和第丨實施例不同，其省略内部 反射面。亦即，切掉形狀形成用以連結出射面26β和背面 (未圖示）的大致垂直光入射面26D，並且朝此光入射面 供給LED18的光線。 由於在本實施例省略内部反射面，因此最好使用放出 光的行進方向的擴張角度較大（亦即，指向性弱）的 LED18。如果LED 18的放出光具有大致9〇度的行進方向 的擴張角度，即可使光線大致均勻地遍布於導光板26内。 亦即’較要求接近180度之行進方向的擴張角度的習用技 術更為有利。 羞3實施例/第4實施例 裝設光輸入部的隅角部，並非如第2實施例所示限於 兩處。例如第4圖所示將大致矩形的導光板的4個隅角部 皆形成斜切的形狀，並且在該處裝設光輸入部也可以。此 時，當然係對應於各隅角部配置LED。將它作為第3實施 例0 而且，如第5圖所示，將大致矩形的導光板的3個隅 角部形成斜切形狀，且在該處裝設光輸入部也可以。此時 也是對應於作為光輸入部的隅角部配置led。將它作為第 4實施例。 在各實施例中，各隅角部的斜切形狀，典型者雖是如 第1實施例形成内部反射面，但也可採用使其不具内部反 射面而與第2實施例相同的形態。 此外，如果可獲得所需要的亮度，則僅在一個隅角部 --------------------訂---------線# (請先閱讀背面之注音？事項再填寫本頁) 本纸張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐） 14 312205 經濟部智慧財產局員工消費合作社印製 496972 五、發明說明（15 裝設光輸入部也可以。而且，相反地僅有隅角部仍嫌亮度 不足時，也有以辅助方式在隅角部以外的部位附加配置一 次光源（LED)的情形。例如，細長的大致矩形的導光板的 長邊中央附近從兩隅角部遠離之光線不容易達到時，也有 為彌補它而輔助配置LED的情形等。 第5實施例 在光輸入部裝設内部反射面時，在第丨實施例顯示由 背面16A的隅角部形成光入射面16D的情形。但如第6圖 所示裝設從背面突出的入射光引導部也可以。此時，一次 光係由入射光引導部的前端作為光入射面。從該處引進的 光線係通過入射光引導部而抵達内部反射面，並且在内部 反射而朝導光板内部擴張。將它作為第5實施例。 1 6實施例/第7 f施例 典型的内部反射面係如第1實施例所示形成平坦的斜 面’但如第7圖所示，形成曲面也可以。此時，透過曲面 的設計，可調整内部反射後的内部傳播光的行進方向分 佈。將它作為第6實施例。 而且，如第8圖所示，將切掉隅角部的形狀之斜面形 成扭曲的斜面也可以。此時，如圖所示，此斜面和左右側 面相會的兩條稜線形成不同長度。如果這樣對於内部反射 面進行扭曲，即可透過其扭曲的設計而調整内部反射後的 光線行進方向的分佈。將它作為第7實施例。 施例 在上述各實施例中，於實施光輸入的隅角部形成内部 ---------------------^ _________ (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐 15 312205V. Description of the invention (10; printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. In addition, there may be cases where the entire exit surface 16B is roughened in place of the scattered light pattern to promote the exit. Such light guide plates 16 and reflection The sheets 5 are all housed in a frame (not shown) and mounted on a predetermined position on the wiring substrate 17. The wiring substrate 17 is provided with a product for driving the liquid crystal display panel 2 of the liquid crystal display device 11 installed in a mobile phone. The body circuit, or the circuit that drives the LEDi8. The LED 18 itself is also mounted on the wiring substrate 17. The mounting position and mounting posture of the LEm8 are selected in such a way that the emitted light is incident on the light incident surface 16D without waste. And if detailed In other words, the relationship between the main traveling direction of the emitted light and the plane orientation (angles 01, 02) of the internal reflecting surface 16C or the intensity of the directivity of the emitted light (the degree of expansion in the angle of the traveling direction toward the light incident surface 16D) It is best to consider it, that is, it is best to consider the above angles 01, 02 or the intensity of the directivity of the emitted light, and set the installation position and installation posture of the LED 18 so that the light can be The amount is evenly distributed throughout the entire exit surface 16B. In particular, it is better not to cause a large penetration loss due to the internal reflection of the internal reflection surface 16. Therefore, as long as the installation angle is adjusted, most of the light emitted during internal reflection The space only needs to meet the total reflection conditions. Therefore, 'the installation posture of the LED 18 does not have to be opposite to the light incident surface 16D', and the main traveling direction of the emitted light may be formed at a predetermined angle with respect to the rear surface 16A or the emission surface 16B. When LED18 is installed, it is best to pay attention to whether there is a difference in the vertical and horizontal directions with respect to the intensity of the directivity of the emitted light (the degree of expansion in the direction of travel). That is, as shown in Figure 1, a rectangular parallelepiped ， · ¡° Apply to China National Standard (CNS) a4 specification (210 x 297 mm) IK ------------------- Order · ------ -(Please read the note on the back first) and then fill out this page) 312205 496972 A7 B7 Revision V. Invention Description (U) When the shape of the component constitutes LED 18, the long axis direction of the expansion system that emits light is larger than the short axis direction . In other words, the isoincident intensity lines on the light incident surface 16D form a concentric elliptical shape (the major axis direction of the ellipse and the major axis direction of the component are parallel). Therefore, when mounting the LED 18, as shown in Fig. 1, it is preferable to set the long axis direction parallel to the edge of the internal reflection surface 16C. A flexible substrate 19 is used for the electrical connection between the integrated circuit and the liquid crystal display panel 2. However, since these electrical connection structures have no particular relationship with the gist of the present invention, they will not be described in detail. The following describes how light travels in the liquid crystal display device 11 configured as described above. When the LED 18 is turned on, light is introduced into the light guide plate 16 through the light incident surface 16D. Most of the introduced light is internally incident on the internal reflection surface 16C for internal reflection. Components with an incident angle greater than the critical angle when internally incident are totally reflected. The more components that are totally reflected, the less light will leak from the internal reflecting surface 16C. Here, as described above, the angle (see FIG. 2 (B)) and the mounting position of the LED 18 (the direction of light emission) are determined in consideration of this point. As described above, the light which is effectively input to the light guide plate 16 and changes its direction is transmitted to the inside of the light guide plate 16 in such a manner as to leave the internal reflection surface 16c in the direction of expansion. It should be noted here that most of the components of the internal propagation direction that are not parallel to the back surface 16 and the exit surface 16B are repeatedly incident inside the back surface 16A and the exit surface 16B during the internal propagation process. When the exit surface ΐ6β is a mirror surface, the incident angle at the time of internal incidence is lower than the critical angle—some components will exit from the exit surface 16B. Moreover, for the exit surface 16B, the Chinese National Standard (CNS) A4 specification (21〇x 297 meals) is applied to the paper size by the aforementioned light scattering. 312205 -ϋ nnmn II an n I * ft— nnnn an ϋ · « 1— n in ϋ II · ϋ I say (please read the message on the back? Matters before filling out this page) Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 11 496972 Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 6 years V »] Day Correction / Financial Film ^^ .A7 ---------- ^ L · __ V. Description of the Invention (12) When the pattern or overall roughening is used to promote the shooting, it should be based on this Promote shooting. From the perspective of such an emitting mechanism, the main traveling direction of the emitted light of the LED 18 after internal reflection on the internal reflecting surface 16C is not parallel to the emitting surface 16B, but it is preferably inclined at a small angle with the emitting surface 16β. This inclination angle is preferably specified by design by adjusting the relationship between the angle Θ 2 (see Fig. 2 ⑻) and the installation posture of the LED 18. Generally speaking, if the angle of inclination is too large, the light will not easily reach the portion far away from the internal reflecting surface 16C. If it is too small, the emission intensity will decrease near the internal reflecting surface 16C. In addition, the light emitted from the back surface 16 is reflected by the reflection sheet 5 and returned to the light guide plate 16, and then provides an opportunity to be incident inside the exit surface 16B. Therefore, the light emitted from the emission surface 16B can be supplied to the liquid crystal display panel 2. The liquid crystal display panel 2 irradiated from the back is driven by a driving circuit mounted on the wiring substrate 7 and displays a portrait in a well-known form. As can be understood from the above description, unlike conventional techniques (see Figs. 10 to 12), since the light is supplied from the corners, it is easy to expand the direction of travel provided by the internally propagating light. The light is made to pass through the light guide plate 16 in a uniform manner. In a typical case where the light guide plate 16 is slightly rectangular, the expansion angle of the traveling direction of the internally propagated light may be about 90 degrees. In the case of relatively conventional techniques, requiring an expansion angle close to 180 degrees is actually quite difficult. The order of the plural arrows shown in Fig. 11 is a conceptual representation of the emergence of light from the exit surface and does not particularly indicate the emergence of parallel light beams. However, if it is a class S with most micro reflectors on the back of the light guide plate --------- Order --------- Line 1 (please read the back first; 1 tone Please fill in this page again for the matter.) This paper size is in accordance with Chinese National Standard (CNS) A4 specifications ⑵Q X 297 public meals. 12 312205/2/2 Printed by A7 of the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. DESCRIPTION OF THE INVENTION (13) Type 'can obtain light with strong directivity (near parallel beams) in the front direction. And it ’s no longer necessary to arrange the light source (LED 18) along the edge of the light guide plate as before (refer to Figure 10), so there is room for space here. As shown in Fig. 1, this space can be effectively used to allow the flexible substrate 19 to pass easily. This has great significance in the structural design of, for example, a mobile phone. In other words, in the conventional structure (Fig. 10), since the flexible substrate 19 must be arranged in a manner that does not block the light of the LED 18, the flexible substrate 19 cannot be removed from the liquid crystal as shown by the dotted line in Fig. 10. The display panel is drawn out from the left and right sides of the light guide plate, that is, from there, the driver circuit is connected to the vicinity of the wiring board through the left and right side portions of the light guide plate. Therefore, there is a problem that the lateral width of the so-called mobile phone is much larger than that of the display. In contrast, the invention exemplified in this embodiment extracts the flexible substrate 19 from the liquid crystal display panel 2 and passes through the front and rear sides of the light guide plate ι6 (equivalent to the portion where the LED 8 is arranged in FIG. 10). The 16A side of the back surface enables connection to the drive circuit. Therefore, the lateral width of the mobile phone can be reduced (approximately the same as the lateral width of the display. The above is the outline of the first embodiment. However, the shape of the corners of the light input to the light guide plate can be modified in various ways. Here are a few of them. Deformation examples are as follows: In addition, the explanation is only for the corner shape of the light wheel, and does not repeat the description of matters that have high commonality with the first embodiment. Name 2 Implementation You In this embodiment, the light guide plate can be used The light guide plate 26 shown in Fig. 3. As shown in the figure, the two corner portions of the light guide plate 26 are formed into a chamfered shape and ------------- installation --- ---- Order --------- Line (Please read the precautions on the back before filling this page) This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) 13 312205 Economy Printed by the Intellectual Property Bureau ’s Consumer Cooperatives 496972,… Α7 --------——___ J7______ V. Description of the Invention (14) and this is used as the light input unit, but it is different from the first embodiment and it omits the internal reflection That is, a large shape is cut out so as to connect the exit surface 26β with the back surface (not shown). The light incident surface 26D is perpendicular, and the light from the LED 18 is supplied to the light incident surface. Since the internal reflection surface is omitted in this embodiment, it is best to use a light with a larger expansion angle in the direction of travel of the light (ie, weak directivity). LED 18. If the light emitted from LED 18 has an expansion angle of approximately 90 degrees in the direction of travel, the light can be spread throughout the light guide plate 26 evenly. That is, a custom that requires an expansion angle of approximately 180 degrees in the direction of travel. The technology is more advantageous. In the third embodiment / the fourth embodiment, the corners of the light input portion are not limited to two places as shown in the second embodiment. For example, as shown in FIG. Each corner portion is formed into a chamfered shape, and a light input portion may be installed there. At this time, of course, LEDs are arranged corresponding to each corner portion. Let it be a third embodiment. As shown in the figure, the three corners of a generally rectangular light guide plate are formed into a chamfered shape, and a light input portion may be installed there. At this time, LEDs are also arranged to correspond to the corners of the light input portion. It serves as the fourth embodiment. In each embodiment, the chamfered shape of each corner portion is typically formed as the internal reflection surface as in the first embodiment, but it may be the same as the second embodiment without the internal reflection surface. If you can get the brightness you need, only in one corner -------------------- Order --------- Line # (please first Read the phonetic on the back? Matters need to fill in this page) This paper size applies Chinese National Standard (CNS) A4 (210 x 297 mm) 14 312205 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 496972 V. Description of Invention (15 It is also possible to install an optical input section. In addition, when the corner portion is still considered insufficient in brightness on the contrary, an additional light source (LED) may be additionally provided in a position other than the corner portion. For example, when the light from the corners near the center of the long side of an elongated, roughly rectangular light guide plate is not easily reached, there may be cases where LEDs are provided to supplement it. Fifth Embodiment In the case where an internal reflection surface is provided in the light input portion, the light incident surface 16D is formed by the corner portion of the rear surface 16A in the first embodiment. However, as shown in FIG. 6, an incident light guide portion protruding from the back surface may be provided. In this case, the primary light system uses the tip of the incident light guide as the light incident surface. The light introduced from there passes through the incident light guide to the internal reflection surface, and is reflected internally to expand inside the light guide plate. Let this be a 5th Example. 16th embodiment / 7th embodiment A typical internal reflection surface is formed as a flat inclined surface as shown in the first embodiment. However, as shown in FIG. 7, a curved surface may be formed. At this time, through the design of the curved surface, the traveling direction distribution of the internally propagated light after the internal reflection can be adjusted. Let this be a 6th Example. Further, as shown in Fig. 8, the inclined surface in which the shape of the corner portion is cut out may be a twisted inclined surface. At this time, as shown in the figure, the two ridgelines where the slope and the left and right sides meet form different lengths. If the internal reflection surface is distorted in this way, the distribution of the traveling direction of the light after internal reflection can be adjusted through its twisted design. Let this be a seventh embodiment. In each of the above embodiments, an inner portion is formed at the corner portion where light input is performed --------------------- ^ _________ (Please read the precautions on the back first (Fill in this page again) This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm 15 312205)
496972 心年（Μ>( π修正/类 五、發明說明（16 二入射面係裝設於背面側(在第6實施例為入射 ,…則端）。但在出射面側裝設光人射面也可以。此 配置適於如第9圖所干的辦神乂 團所不的所兩别面照射型的照明。此 设計成反射型的液晶海+把产 我日日顯不板在隅角部具有缺口，且 LED配置於在該處產生的空間。藉此，全體形狀變得簡化， 與將㈣配置於背面側之情況更可縮小厚度。 led的放出光係通過由出射面的隅角部所形成的光入 射面而使光線朝向内部反射面。在内部反射面進行内部反 射的光線係遍布於導光板内。從液晶顯示板側出射的光線 可供給至液晶顯示板，並且以周知的形態顯示。顯示像的 觀察係從背面（圖中，導光板的上面）側透過導光板來進 行。將它作為第8實施例。 此外，將光入射面裝設於出射面側時，在出射面隅角 部裝設從出射面突出的入射光引導部，並將其前端作為光 入射面也可以。此時，以嵌入液晶顯示板的隅角部之缺口 部的形式扣住其入射光引導部，以利用於導光板和液晶顯 示板的位置對準也可以。但’此時，為防止入射光引導部 表面的4貝傷’农好於液晶顯不板或入射光引導部的至少一 方預先實施為防止受損的處理（保護膜的形成等）。因為如 果入射光引導部的表面受損，即有從該處產生漏光之虞。 其他的變形 上述各實施例並不限定本發明的範圍。例如，容許如 下的變形。 (a)配置於各光輸入隅角部的一次光源（典型的是led) , ^---------線 (請先閱讀背面之1音？事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS)A4規格（210x 297公餐） 16 312205 496972 年Ί 曰修正/更王7^Χ Α7496972 (M > (π correction / Class V. Invention description (16) The second incident surface is installed on the back side (incident in the sixth embodiment, ...).) The surface is also available. This configuration is suitable for the two types of surface-illumination type lighting, which is not done by the ensemble as shown in Figure 9. This design is a reflective LCD sea + The corner portion has a notch, and the LED is disposed in the space generated there. As a result, the overall shape is simplified, and the thickness can be reduced in the case where the LED is disposed on the back side. The light incident surface formed by the corner portion directs light toward the internal reflection surface. The light reflected internally on the internal reflection surface is distributed throughout the light guide plate. The light emitted from the liquid crystal display panel side can be supplied to the liquid crystal display panel, and A well-known form display. The observation of the display image is performed through the light guide plate from the back (the upper side of the light guide plate in the figure) side. This is the eighth embodiment. In addition, when the light incident surface is installed on the exit surface side, Install the corner of the exit surface to project from the exit surface The incident light guide portion may be used as the light incident surface. At this time, the incident light guide portion is buckled in the form of a notched portion embedded in the corner portion of the liquid crystal display panel for use in the light guide plate and the liquid crystal. The position of the display panel can also be aligned. However, at this time, to prevent damage to the surface of the incident light guide portion, it is better than at least one of the liquid crystal display panel or the incident light guide portion to perform a treatment to prevent damage in advance ( Formation of a protective film, etc.) because if the surface of the incident light guide is damaged, light leakage may occur therefrom. Other Modifications The above embodiments do not limit the scope of the present invention. For example, the following modifications are allowed. (a) Primary light source (typically led) placed at the corner of each light input, ^ --------- line (please read the 1 tone on the back? Matters before filling this page) Wisdom of the Ministry of Economic Affairs Printed on the paper by the Consumers' Cooperative of the Property Bureau. The paper size is applicable to China National Standard (CNS) A4 (210x 297 meals). 16 312205 496972 Years of Amendment / King 7 ^ × Α7
呂丁 17 312205 線Luding 17 312205 line