200422667 五、發明說明（1) 一、【發明所屬之技術領域】 本發明係有關於一種背光模組之導光板構型；特別是 有關於一種側光型背光模組之導光板構型。 二、【先前技術】 ，高輝度與 板必備的條 光源系統， 圖，其 〆反光 1 、一 對於入 背面1 光經投 次全反 至lib些 出，如 包圍光 3反射 1 4係 1 2背 包括 片1 背面 射光 2 2 射至 射， 圓凸 光束 源1 ，以 設於 面1 近幾年來’液晶顯不面板的需求大為增加 高對比以及短反應時間為目前選購液晶顯示面 件。一般的液晶顯示面板係使用背光模組做為 如第一圖所示，係一習知背光模組之截面示意 一光源1 1 、一導光板12 、一反光罩13及 4 。導光板1 2具有一光輸出用的出射面1 2 1 2 2及一光輸入用的入射端面1 2 3 ，係相 束呈垂直平面，並位於光源1 1 一側。導光板 内部具有多個圓凸點1 2 4 。光源1 1的發射 入射端面1 2 3 ，進入導光板1 2内部進行多 如光束B。當導光板1 2内部的反射光束A投射 點1 2 4時，係被散射導引至出射面1 2 1輸 A 1，成為背光模組的發光來源。反光罩1 3係 1 ，以使光源1 1背面發射的光束經反光罩1 投射在導光板1 2的入射端面1 2 3 。反光片 導光板1 2背面1 2 2外部，以反射從導光板 2 2穿透的光束。 如上述，光束在導光板 内部的出射方式係利用反200422667 V. Description of the invention (1) 1. [Technical field to which the invention belongs] The present invention relates to a light guide plate configuration of a backlight module; in particular, it relates to a light guide plate configuration of an edge-lit backlight module. Second, [prior art], the stripe light source system with high brightness and board necessary, Figure, its 〆 reflection 1, one for the back 1 light after the full reflection to lib some, such as the surrounding light 3 reflection 1 4 series 1 2 The back includes a sheet 1 and a back light 2 2 to the light. A convex light source 1 is provided on the surface 1. In recent years, the demand for LCD panels has increased greatly, with high contrast and short response time. . A general liquid crystal display panel uses a backlight module as shown in the first figure, which is a cross-sectional view of a conventional backlight module. A light source 1 1, a light guide plate 12, and reflectors 13 and 4. The light guide plate 12 has an exit surface 1 2 1 2 for light output and an entrance end 1 2 3 for light input. The light beam is in a vertical plane and is located on the light source 1 1 side. The light guide plate has a plurality of round bumps 1 2 4 inside. The emission of the light source 11 1 enters the end surface 1 2 3 and enters the light guide plate 12 to perform as much as the light beam B. When the reflected light beam A inside the light guide plate 12 projects at the point 1 2 4, it is scattered and guided to the exit surface 1 2 1 and A 1 to become the light source of the backlight module. The reflector 1 3 is 1 so that the light beam emitted from the back of the light source 11 1 is projected on the incident end surface 1 2 3 of the light guide plate 12 through the reflector 1. Reflective sheet 1 2 The back of the light guide plate 1 2 is external to reflect the light beam transmitted through the light guide plate 2 2. As described above, the way the beam exits inside the light guide plate
第6 .頁一 200422667 五、發明說明（2) 射光束投射在導光板1 2背面1 2 2内部的圓凸點1 2 4 上，破壞其在導光板1 2内部的全反射能力，使光束能由 出射面1 2 1出射。習知導光板1 2的材質為壓克力，其 全反射臨界角為4 1. 8〜光源1 1發射的光束，大都以平 行光束從空氣投射至導光板1 2呈垂直平面的入射端面1 2 3 ，其在導光板1 2内部的入射角往往無法大於全反射 臨界角。因此光束進入導光板1 2内部後，大都以一次光 程方式行進，極容易從導光板相對入射端面1 2 3的一端 出射，造成光源的損失。 據此，亟待提供一種改良的導光板構型，其可克服習 知導光板的缺失。 三、【發明内容】 本發明之主要目的係提供一種側光型背光模組之導光 板構型，係藉由導光板不同構型的光輸入用的入射端面， 使入射光以大於導光板全反射臨界角的角度投射至導光板 内部，以提高光束在導光板内部的光路延長性，增加光投 射在導光板背面光散射圖案的機會，進而使導光板的光出 射效率提高。 本發明之另一目的係提供一種側光型背光模組之導光 板構型，係藉由導光板不同構型的光輸入用的入射端面， 增加投射光在導光板内的光路延長性，以使導光板的光利Page 6.200422667 V. Description of the invention (2) The light beam is projected on the round bumps 1 2 4 inside the light guide plate 1 2 back 1 2 2 to destroy its total reflection ability inside the light guide plate 12 and make the light beam Can be emitted from the exit surface 1 2 1. The material of the conventional light guide plate 12 is acrylic, and the critical angle of its total reflection is 4 1. 8 ~ The light beams emitted by the light source 11 are mostly projected by the parallel light beam from the air to the light guide plate 12 as the incident end surface 1 in a vertical plane. 2 3, the incident angle inside the light guide plate 12 cannot be larger than the critical angle of total reflection. Therefore, after the light beam enters the inside of the light guide plate 12, most of them travel in a single optical path, and it is very easy to exit from the end of the light guide plate opposite to the incident end surface 1 2 3, resulting in the loss of the light source. Accordingly, there is an urgent need to provide an improved light guide plate configuration that can overcome the lack of conventional light guide plates. 3. [Content of the invention] The main purpose of the present invention is to provide a light guide plate configuration of an edge-lit backlight module, which uses an incident end face for light input of a different configuration of the light guide plate, so that the incident light is larger than the light guide plate. The angle of the reflection critical angle is projected into the light guide plate to improve the optical path elongation of the light beam inside the light guide plate, increase the chance of light projecting on the light scattering pattern on the back of the light guide plate, and further improve the light emission efficiency of the light guide plate. Another object of the present invention is to provide a light guide plate configuration of an edge-light type backlight module, which increases the optical path elongation of the projected light in the light guide plate through the incident end face of the light input of the light guide plate with different configurations. Make the light guide light
第7頁 200422667 五、發明說明（3) 用率及光輸出均勻度提高，進而使結合本發明背光模組的 顯示面板輝度增加。 根據以上所述之目的，本發明提供一種側光型背光模 組之導光板構型，其包括一導光板主體，係具有光輸入用 之至少一入射端面、一背面及光輸出用之一出射面，其中 此入射端面係相對於入射光束呈非垂直面，及此背面具有 一光散射圖案，供導引導光板内的反射光從此出射面輸出 。透過導光板呈非垂直面的入射端面，使光投射至導光板 内部的角度大於導光板的全反射臨界角，以提高光束在導 光板内的光路延長性，進而增加導光板内反射光投射在光 散射圖案的機會，以提高導光板的光出射效率。 藉本發明導光板不同形狀的入射端面構型，可改善導 光板的光利用率及其光輸出均勻度，進而能提高結合本發 明背光模組之顯示面板輝度。再者，本發明藉提供不同構 型變化的導光板應用於背光模組，可在不增加背光模組組 件的情況下，提高背光模組的光利用率及光輸出均勻度， 使顯示面板輝度提高。因此，本發明背光模組製造簡單， 同時不增加製造成本。 本發明之目的及諸多優點藉由以下具體實施例之詳細 說明，並參照所附圖式，將趨於明瞭。Page 7 200422667 V. Description of the invention (3) The utilization rate and the uniformity of light output are improved, thereby increasing the brightness of the display panel combined with the backlight module of the present invention. According to the above-mentioned object, the present invention provides a light guide plate configuration of an edge-lit backlight module, which includes a light guide plate main body having at least one incident end face for light input, one back face, and one exit for light output. Surface, wherein the incident end surface is a non-vertical plane with respect to the incident light beam, and the back surface has a light scattering pattern for the reflected light in the light guide plate to be output from the exit surface. Pass the light guide plate into a non-vertical incident end surface, so that the angle of light projected into the light guide plate is greater than the critical angle of total reflection of the light guide plate, so as to improve the light path elongation of the light beam in the light guide plate, thereby increasing the reflected light projection in the light guide plate. Opportunity of light scattering pattern to improve light exit efficiency of light guide plate. With the configuration of the incident end surfaces of the light guide plate of different shapes of the present invention, the light utilization efficiency of the light guide plate and the uniformity of the light output can be improved, and the brightness of the display panel combined with the backlight module of the present invention can be improved. Furthermore, the present invention provides light guide plates with different configuration changes to be applied to the backlight module, which can improve the light utilization rate and the uniformity of the light output of the backlight module without increasing the backlight module components, so that the brightness of the display panel is increased. improve. Therefore, the backlight module of the present invention is simple to manufacture without increasing manufacturing costs. The purpose and many advantages of the present invention will be made clear by the following detailed description of specific embodiments and with reference to the accompanying drawings.
第8頁 200422667 五、發明說明（4) 四、【實施方式】 本發明提供的一種側光型背光模組之導光板構型， 利用將導光板光輸入用的至少一入射端面設計成相 ’、 射光束呈非垂直面的不同構型’讓光束投射至入射p面^ 入射至導光板内部的入射角大於導光板的全反射庐^ 後 以使光束在導光板内能執行多次全反射，延長光^在= 板内的光路’以增加反射光投射至本發明導光板北 v ^ 散射圖案的機使反射光經由光散射圖案散射=:光 至導光板的一出射面的機率增加，進描 輸出 的利用率及光輸出的均句度。 進而k “光板對光源 本發明的側光型背光模組之導光 光板主體，係具有光輸入用之至少一入 要包括一導 光輸出用之一出射面，其中此人 J2、一背面及 呈非垂直面，…面具有一光：：圖面；相：以光束 主體内的反射光從此出射面輸出。 "^引冷光板 以下藉由第二圖說明本發明側光型 構型能提咼導光板對光源的利用率吴、、且之導光板 理。第二圖係本發明側光型背光模組之^ ^的均勻度的原 體實施例’其包括一矩形的導光板主體2 〇 n::具 入用的兩個入射端面2 1及2 2 、一皆；〇 〇 、，、有光輪 的-出射面24。導光板主體；〇的二輸出用 係呈互為對稱的凸圓面，及導光板背面2 3内=匕 200422667 五、發明說明（5) ^. 散射圖案，係由複數個凸狀物2 3 1組成，此些凸 3 1係用以破壞導光板内的反射光的全反射能^，狀物2 板内的反射光經由凸狀物2 3 1散射導弓丨輪出至$使導光 4 。導光板主體2 0使用的材質係具有高透光，射面2 稀酸樹脂（a c r y 1 i c r e s i η)如聚甲基丙歸峻甲 作丨如丙 τ s曰（ polymethyl methacrylate) (ΡΜΜΑ)(俗稱壓古丄 凡刀)、取山 酸樹脂（po 1 ycarbonate res i η)及玻璃。以尿 永石灭 的導光板主體2 0為例，其光折射率為1. 4 1 4 Γ σ j材質 全反射臨界角為4 1 · 8。，當光束經由入射端面2 ^知到其 入射至導光板主體2 〇的入射角0控制在41 8。<及2 2 4 8 · 2。，則可使光束在導光板主體2 〇内部執行〈 使其光路延長性較好，進而提高反射光束投射射， 2 3 1的機率，而增加反射光束經由出射面2 2狀物 會，進而提高導光板對光源的利用率及其光輪==的機 本發明藉導光板主體2 〇的入射端面2丄及2二=，。 ，可控制大多數平行光束人射至導光板主體2 〇二二 =角^ 41· 8ΧΘ <48· 2〇，使光束在導光板主體2 〇内部可 订全反射，具有較佳的光路延長性，而增加反 射至凸狀物2 3 1的機率。Α去，Λ Α+紗而0 , 尤果才又 啊千 冉者，入射端面2 1及9 9從 呈稱的凸㈣’光束在導光板主體2 〇 = ，亦：糟由投射至兩入射端面2…2 射回來，而不至從入射端面2 i及2 2出射。 一反 第二A圖至第三Gil係顯示各種具不同入射端面構型的Page 8 200422667 V. Description of the invention (4) IV. [Embodiment] The light guide plate configuration of an edge-light type backlight module provided by the present invention uses at least one incident end face for light input of the light guide plate to be designed as a phase ' The different configurations of the light beams that are not vertical planes' let the light beam be projected onto the incident p-plane ^ The angle of incidence into the light guide plate is greater than the total reflection of the light guide plate ^ so that the light beam can perform multiple total reflections in the light guide plate Extend the light ^ in the light path of the plate 'to increase the reflected light projected to the light guide plate north v ^ The scattering pattern of the machine causes the reflected light to be scattered through the light scattering pattern =: the probability of the light reaching an exit surface of the light guide plate increases, Utilization of trace output and average sentence output of light. Further, "light plate to light source", the light guide plate main body of the edge-light type backlight module of the present invention has at least one entrance for light input and one exit surface for light guide output, wherein the person J2, a back surface, and It is a non-vertical plane, and the mask has a light :: a picture surface; a phase: the reflected light in the main body of the light beam is output from this exit surface. &Quot; The light guide plate improves the utilization ratio of the light source by the light guide plate. The second figure is an original embodiment of the uniformity of the side-light backlight module according to the present invention, which includes a rectangular light guide plate body. 2 〇n :: two incident end faces 2 1 and 2 2 are used; 〇〇 ,, with a light wheel-the exit surface 24. the light guide plate main body; the two output systems are symmetrical to each other Convex surface, and the inner side of the light guide plate 2 3 = 20042004667 V. Description of the invention (5) ^. The scattering pattern is composed of a plurality of convex objects 2 3 1 which are used to destroy the light guide plate. Total reflection energy of the reflected light ^, the reflected light in the plate 2 is scattered by the convex 2 3 1 guide bow 丨Turn it out to make the light guide 4. The material used for the light guide plate body 20 is highly transparent, and the light emitting surface 2 is a dilute acid resin (acry 1 icresi η), such as polymethylpropionate, such as propyl τ s. (Polymethyl methacrylate) (PMMAA) (commonly known as compressing ancient knives), taking po 1 ycarbonate res i η and glass. Take the light guide plate main body 2 of urinary stone as an example, and its light refractive index is 1 The critical angle of the total reflection of 4 1 4 Γ σ j material is 4 1 · 8. When the light beam passes through the incident end face 2 and the incident angle 0 of the light beam to the light guide plate body 20 is controlled to 41 8 < and 2 2 4 8 · 2., the light beam can be executed inside the light guide plate body 20 to make the optical path longer, and then increase the probability of reflected light beam projection, 2 3 1 and increase the reflected light beam through the exit surface 2 2 The meeting will further improve the utilization of the light source by the light guide plate and the mechanism of the light wheel == The invention utilizes the incident end faces 2 丄 and 22 of the light guide plate body 20 to control most of the parallel beams of light to the light guide plate. Main body 2 022 = Angle ^ 41 · 8 × Θ < 48 · 2〇, so that the light beam is inside the light guide plate body 2 〇 Ordering total reflection has better optical path elongation, and increases the probability of reflecting to the convex object 2 3 1. A goes, Λ A + yarn and 0, You Guocai again Qianran, the incident end faces 2 1 and 9 9 From the so-called convex ridge 'beam in the light guide plate body 2 〇 =, also: the incident from the incident end 2 2 back to the incident, but not from the incident end 2 i and 22 2 out. Second A Figures to the third Gil series show a variety of
第10頁 200422667 五、發明說明（6) 矩形導光板截面示意圖，其入射端面相對於投射光束依次 呈垂直平面、斜平面、凸圓面、凹圓面、八角面、連續小 圓面（連續凸曲面）、四分之一圓面（四分之一凸曲面） 。第四圖係顯示出光束在第三A圖至第三G圖的各種導光板 内部的全反射次數及投射至導光板後被接受到的光能量大 小，其中以入射端面呈凹圓面時，能接受到較多的光能量 ，即入射到較多的光束，而入射端面呈凸圓面時，光束在 導光板内部能執行較多次的全反射。另一方面，導光板的 入射端面呈垂直平面時，光束在導光板内部的全反射次數 最少，而光束在呈非垂直面入射端面的導光板内部的全反 射次數皆大於呈垂直平面入射端面的導光板。基於上述結 果，本發明即利用各種呈非垂直面的不同構型的入射端面 ，使大多數平行光束投射至導光板入射端面後，其光束入 射至導光板内部的入射角會大於導光板的全反射臨界角， 以能執行全反射，增加光束在導光板内部的全反射次數， 延長光束在導光板内部的光路，而提高光束投射至光散射 圖案的機率，進而提高導光板的光源利用率及其光輸出均 勻度。如此一來，可使結合本發明背光模組的顯示面板輝 度增加。 第五A圖至第五J圖及第六A圖至第六J圖以及第七A圖 至第七J圖係顯示本發明側光型背光模組之導光板呈非垂 直面的入射端面構型的各種變化例，係包括斜平面、錐形 面、凸圓面、凸曲面、凹曲面、連續凸曲面、連續凹曲面Page 10 200422667 V. Description of the invention (6) A schematic cross-sectional view of a rectangular light guide plate, the incident end surface of which is in a vertical plane, an oblique plane, a convex round surface, a concave round surface, an octagonal surface, a continuous small round surface (continuous convex) Curved surface), quarter round surface (quarter convex surface). The fourth picture shows the total reflection times of the light beams in the various light guide plates in the third A to third G pictures and the amount of light energy received after being projected on the light guide plate. When the incident end surface is concave, When more light energy is received, that is, more light beams are incident, and when the incident end surface is convex, the light beam can perform multiple total reflections inside the light guide plate. On the other hand, when the incident end face of the light guide plate is a vertical plane, the total number of total reflections of the light beam inside the light guide plate is the smallest, and the total number of total reflection times of the light beam inside the light guide plate that is the non-vertical incident end surface is greater than that of the light plane. Light guide. Based on the above results, the present invention uses various incident end faces with different configurations that are not vertical, so that after most parallel light beams are projected onto the incident end face of the light guide plate, the angle of incidence of the light beam entering the light guide plate will be greater than the total angle of the light guide plate. The critical reflection angle can perform total reflection, increase the total reflection times of the light beam inside the light guide plate, extend the light path of the light beam inside the light guide plate, and increase the probability of the light beam projecting to the light scattering pattern, thereby improving the light source utilization rate of the light guide plate and Its light output is uniform. In this way, the brightness of the display panel combined with the backlight module of the present invention can be increased. Figures 5A to 5J, Figures 6A to 6J, and Figures 7A to 7J show the incident end structure of the light guide plate of the edge-lit backlight module of the present invention in a non-vertical plane. Variations of the model, including oblique plane, tapered surface, convex circular surface, convex curved surface, concave curved surface, continuous convex curved surface, continuous concave curved surface
第11頁 200422667 五、發明說明（7) 、多角形面、四分之一弧面、稜鏡面、階梯面、對稱雙階 梯面及凹凸不規則面等。須注意的是，本發明導光板呈非 垂直面的入射端面構型並不受限於上述的各種變化例，凡 月b使入射光在導光板内部的入射角大於導光板的全反射臨 界角的壬非垂直面的入射端面皆適合做為本發明導光板構 型。此外’本發明的導光板主體除了矩形體外，亦可以是 楔形體（wedge-type body )，如第八A圖至第八F圖所示 ’其中導光板主體只具有一呈非垂直面的入射端面，及可 為對稱的雙楔形體，如第九A圖至第九F圖所示，其中兩入 射端面構型可互為對稱。 另一方面，本發明導光板主體的光散射圖案除了形成 在導光板背面内部外，亦可形成於導光板背面外部。同時 可將導光板的出射面表面設計成稜鏡面，使出射光出射方 向集中在結合的顯示面板的視角範圍内。本發明的側光型 背光模組適用於單邊或雙邊側光型背光源系統，其可供做 兔光鍵盤、行動電話顯示面板、液晶顯示面板、電視畫面 液晶顯示面板、掌上型數位助理（pda )顯示面板及穿透 式掃描器等的背光源系統。 本發明藉提供不同構型變化的導光板應用於背光模組 ’可在不增加背光模組組件的情況下，提高背光模組的光 利用率及光輸出均勻度，使顯示面板輝度提高。本發明背 光模組製造簡單，同時不增加製造成本。Page 11 200422667 V. Description of the invention (7), polygonal surface, quarter-arc surface, concrete surface, stepped surface, symmetrical double-stepped stepped surface and uneven surface. It should be noted that the configuration of the incident end face of the light guide plate of the present invention that is not perpendicular is not limited to the above-mentioned various variations. The month b makes the incident angle of the incident light inside the light guide plate greater than the critical angle of total reflection of the light guide plate. The incident end faces of the non-perpendicular plane are suitable for the configuration of the light guide plate of the present invention. In addition, 'the main body of the light guide plate of the present invention may be a wedge-type body in addition to a rectangular body, as shown in Figures 8A to 8F', wherein the light guide plate body has only a non-vertical incident surface. The end surface and the double wedge-shaped body may be symmetrical, as shown in FIGS. 9A to 9F, wherein the configurations of the two incident end surfaces may be symmetrical to each other. On the other hand, the light-scattering pattern of the main body of the light guide plate of the present invention may be formed outside the back surface of the light guide plate in addition to being formed inside the back surface of the light guide plate. At the same time, the exit surface of the light guide plate can be designed as a flat surface, so that the exit direction of the exit light is concentrated within the viewing angle range of the combined display panel. The edge-lit backlight module of the present invention is suitable for a unilateral or bilateral edge-lit backlight system, and can be used as a rabbit light keyboard, a mobile phone display panel, a liquid crystal display panel, a television screen liquid crystal display panel, and a palm-type digital assistant ( pda) backlight systems such as display panels and transmissive scanners. The present invention provides light guide plates with different configuration changes to be applied to the backlight module ′, which can increase the light utilization rate and light output uniformity of the backlight module without increasing the backlight module components, so as to improve the brightness of the display panel. The backlight module of the present invention is simple to manufacture and does not increase manufacturing costs.
第12頁 200422667 五、發明說明（8) 以上所述僅為本發明之具體實施例而已，並非用以限 定本發明之申請專利範圍；凡其它未脫離本發明所揭示之 精神下所完成之等效改變或修飾，均應包含在下述之申請 專利範圍内。 _Page 12 200422667 V. Description of the invention (8) The above description is only a specific embodiment of the present invention, and is not intended to limit the scope of the patent application for the present invention; all others that have been completed without departing from the spirit disclosed by the present invention, etc. Effective changes or modifications should be included in the scope of patent application described below. _
第13頁 200422667 圖式簡單說明 五、【圖式簡單說明】 第一圖係一傳統的背光模組截面示意圖 第二圖係根據本發明一具體實施例的背光模組截面示 意圖； 第三A圖至第三G係本發明導光板構型的各種變化例； 第四圖係光束在第三A圖至第三G圖的各種導光板構型 内部的全反射次數及被接受到的光能量的關係圖； 第五A圖至第五J圖係顯示本發明導光板入射端面構型 的各種變化例； 第六A圖至第六J圖係顯示本發明導光板入射端面構型 的各種變化例； 第七A圖至第七J圖係顯示本發明導光板入射端面構型 的各種變化例； 第八A圖至第八F圖係本發明導光板構型的各種變化例 :及 第九A圖至第九F圖係本發明導光板構型的各種變化例 m in ϊΙ 第14頁 200422667 圖式簡單說明 主要部份之代表符號： 11 光源 12 導光板. 13 反光罩Page 13 200422667 Brief description of the drawings V. [Simplified description of the drawings] The first diagram is a schematic sectional view of a conventional backlight module. The second diagram is a schematic sectional view of a backlight module according to a specific embodiment of the present invention. The third to the third G are various variations of the light guide plate configuration of the present invention. The fourth diagram is the total reflection times of the light beams in the various light guide plate configurations of the third A to the third G diagram and the received light energy. Relationship diagrams; FIGS. 5A to 5J show various variations of the configuration of the incident end face of the light guide plate of the present invention; FIGS. 6A to 6 J show various variations of the configuration of the incident end face of the light guide plate of the present invention; Figures 7A to 7J show various variations of the configuration of the incident end face of the light guide plate of the present invention; Figures 8A to 8F show various changes of the configuration of the light guide plate of the present invention: and ninth A Figures 9 through 9 show various variations of the configuration of the light guide plate of the present invention. Min ϊΙ Page 14 200422667 The schematic representation of the main part of the schematic symbol: 11 light source 12 light guide plate. 13 reflector
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