TWI271582B

TWI271582B - Backlight system, light guide plate and method of fabricating the same

Info

Publication number: TWI271582B
Application number: TW92125015A
Authority: TW
Inventors: Wen-Feng Cheng
Original assignee: Hon Hai Prec Ind Co Ltd
Priority date: 2003-09-10
Filing date: 2003-09-10
Publication date: 2007-01-21
Also published as: TW200510862A

Abstract

The present invention relates to a light guide plate (LGP) having diffusion function, a backlight using the LGP and a method of fabricating the same. The LGP includes a transparent plate and a light diffusion part. The transparent plate has an incidence surface and a light-emitting surface. The light diffusion part is made of UV-glue and diffusion powder and is on the border of the light-emitting surface of the transparent plate.

Description

12715821271582

【發明所屬之技術領域】本發明係關於一種且於射# & + μ , , .. 、搜具擴政功此之導光板及其製造方 ’以及採用此導光板之背光模組。法先前技術】由於液晶顯示器面板中而，為達到顯示效果，須給裝置，如背光模組，其功能度充分且分佈均勻之面光源之液晶本身不具發光特性，因液晶顯示器面板提供一面光源在於向液晶顯示器面板提供輝BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate and a manufacturing method thereof, and a backlight module using the light guide plate. Prior art] Because of the liquid crystal display panel, in order to achieve the display effect, the device, such as the backlight module, has a full-featured and evenly distributed surface light source, and the liquid crystal itself has no light-emitting characteristics, because the liquid crystal display panel provides a light source. Provide a glow to the LCD panel

先月ίΐ技術之月光模組係由光源、導光板、反射板、擴散板及稜鏡層等構成，其中導光板為背光模組中之關鍵元件，其作用在於引導入射光經導光板散射及反射而轉換成面光源。為使此面光源之輝度更加均勻化分佈，通常於導光板出射面側設置擴散板。The moonlight module of the first month is composed of a light source, a light guide plate, a reflection plate, a diffusion plate and a enamel layer. The light guide plate is a key component in the backlight module, and its function is to guide the incident light to be scattered and reflected by the light guide plate. It is converted into a surface light source. In order to make the luminance of the surface light source more uniform, a diffusing plate is usually disposed on the exit surface side of the light guide plate.

一種先前技術可參閱公告於2〇〇2年5月1日之中華民國專利第486 1 0 1號，其所揭露之背光模組如第一圖所示，該背光模組100包括依序疊設之一稜鏡層丨3〇、一擴散板12() 及一導光板11 0，並在該導光板丨丨〇側面端部設有一線狀光源140，該棱鏡層130係由二稜鏡板13i、I”組成，導光板 11 0之底面濺鍍有一反射層1 5 〇。線狀光源1 4 0發出之光線從該導光板11 0側面端部（未標示）進入後，部分光線經由反射層1 5 0反射經導光板11 〇傳輸與擴散板丨2 〇擴散射出；部分光線直接經導光板110傳輸與擴散板12〇擴散射出，進入棱鏡層1 3 0。該背光模組1 0 0設有擴散板1 2 〇，以使出射之光束充分A prior art can be referred to the announcement of the Republic of China Patent No. 486 011 on May 1, 2002. The backlight module disclosed in the first embodiment is as shown in the first figure. A 稜鏡 layer 3丨, a diffusion plate 12() and a light guide plate 110 are disposed, and a linear light source 140 is disposed at a side end portion of the light guide plate, and the prism layer 130 is composed of a second plate 13i, I" composition, the bottom surface of the light guide plate 110 is sputtered with a reflective layer 15 5 〇. The light emitted by the linear light source 110 is entered from the side end (not labeled) of the light guide plate 110, part of the light is reflected The layer 150 is reflected by the light guide plate 11 and transmitted and diffused by the diffusion plate 丨2 〇. The partial light is directly transmitted through the light guide plate 110 and diffused and diffused from the diffusion plate 12 into the prism layer 130. The backlight module 1 0 0 A diffuser plate 1 2 设有 is provided to make the outgoing beam full

1271582 五、發明說明（2) 散射並達到輝度均自。板120，其材料成本高，^需採用擴散成本。由於擔$如7 9η ^衣過転禝雜，耗費工時及人力 130間存有、-戸光月傳#入之子在，則於該導光板110與稜鏡層光損乾面，該二光傳遞介面導致一定量之能。、輝度降低，影響背光模組100之整體光學性板實；；；此，提供-種具擴散功能之背光模組及其導光【發明内容】降处11明之目的在於提供-種結構簡單、成本低、光學性能優良之背光模組。个m 尤于板。本發明之另—目的在於提供-種具擴散功能之導光之製i =之又一目的在於提供一種具擴散功能之導光板 #姑t ΐ明之背光模組包括至少一光源及-導光板，該導光板匕括一透光板及_光擴散結構，該透光板包括至少一用以，收光束之入射面及一用以使光束出射之出射面，該光擴散結構係由擴散性粉末及訂膠製成，其置於透光板之出射面，該擴散性粉末係混合於該υν 係相對透光板之人射面設置。 …以、本發明亦提供一種導光板，其包括一透光板及一光擴散結構，該透光板包括至少一用以接收光束之入射面及一用以使光束出射之出射面，該光擴散結構係由擴散性粉末第6頁 1271582 五、發明說明（3) -- 及UV膠製成，其置於透光板之出射面，該擴散性粉末係、、昆合於該UV膠中。 ”此本發明之導光板製造方法包括以下步驟：提供—透光板，該透光板包括至少一用以接收光束之入射面及_用以使光束出射之出射面，將擴散性粉末混合於UV膠中；將、、曰有擴散性粉末之UV膠塗佈於該出射面上，在該出射面上形成一塗佈層；用紫外線照射設備照射該塗佈層，使之硬化° 本發明導光板之光擴散結構具有擴散性粉末，其可充分散射自出射面出射之光線，使導光板兼具擴散功能，故’在本發明之背光模組中可省掉擴散板，使背光模組結構簡單化，且成本得以降低。且該光擴散結構與透光板之出射面形成一體，使得出射光線之光損耗亦隨之降低，進而提高導光板之整體光學性能。【實施方式】請參閱第二圖，係本發明背光模組之第一實施方式，該背光模組5 0包括一光源6 0及一導光板1 〇，其中導光板1 〇包括一透光板2 0及一光擴散結構30，光源60位於透光板20 之入射面2 5 —側。透光板2 0係由透明之樹脂材料或玻璃製成，其包括入射面2 5、出射面2 1及底面2 3，其中出射面2 1係與底面2 3相對，且出射面21與底面23均與入射面25相交。透光板20之底面2 3具有複數均勻分佈之網點4 1，該複數網點4 1係採用高發散光物質製成。1271582 V. Description of invention (2) Scattering and reaching the luminance are self-contained. The board 120 has a high material cost and requires a diffusion cost. Because the burden is as good as 7 9 η ^, the labor and manpower are stored in 130, and the child is in the light-guide plate 110 and the light-damaged surface of the layer, the second The light transfer interface results in a certain amount of energy. , the brightness is reduced, affecting the overall optical plate of the backlight module 100;;; here, providing a diffusing function of the backlight module and its light guide [invention] The purpose of the drop 11 is to provide a simple structure, A backlight module with low cost and excellent optical performance. M is especially good for boards. Another object of the present invention is to provide a light-transmitting device with a diffusing function. Another object of the present invention is to provide a diffusing function light guide plate. The backlight module includes at least one light source and a light guide plate. The light guide plate comprises a light transmissive plate and a light diffusing structure, wherein the light transmissive plate comprises at least one incident surface for receiving a light beam and an exit surface for emitting a light beam, the light diffusing structure being diffused powder And a binding glue, which is placed on the exit surface of the light-transmitting plate, and the diffusing powder is mixed on the human surface of the υν-based light-transmitting plate. The present invention also provides a light guide plate comprising a light transmissive plate and a light diffusing structure, the light transmissive plate comprising at least one incident surface for receiving a light beam and an exit surface for emitting a light beam, the light The diffusing structure is made of diffusing powder, page 6, 1271582, invention description (3) -- and UV glue, which is placed on the exit surface of the light-transmitting plate, and the diffusing powder is in the UV glue. . The method for manufacturing a light guide plate of the present invention comprises the steps of: providing a light-transmitting plate comprising at least one incident surface for receiving a light beam and an exit surface for emitting the light beam, mixing the diffusing powder In the UV glue, a UV glue having a diffusing powder is applied to the exit surface, and a coating layer is formed on the exit surface; the coating layer is irradiated with an ultraviolet irradiation device to harden it. The light diffusing structure of the light guide plate has a diffusing powder, which can sufficiently scatter the light emitted from the exit surface, so that the light guide plate has a diffusion function, so that the diffusion plate can be omitted in the backlight module of the present invention, and the backlight module can be omitted. The structure is simplified, and the cost is reduced. The light diffusion structure is integrated with the exit surface of the light-transmitting plate, so that the light loss of the emitted light is also reduced, thereby improving the overall optical performance of the light guide plate. The second embodiment is a first embodiment of the backlight module of the present invention. The backlight module 50 includes a light source 60 and a light guide plate 1 , wherein the light guide plate 1 includes a light-transmitting plate 20 and a light. The light source 60 is located on the side of the incident surface 25 of the light-transmitting plate 20. The light-transmitting plate 20 is made of a transparent resin material or glass, and includes an incident surface 25, an exit surface 2 1 and a bottom surface 2 3 . The exit surface 2 1 is opposite to the bottom surface 23, and the exit surface 21 and the bottom surface 23 both intersect the incident surface 25. The bottom surface 23 of the light transmissive plate 20 has a plurality of uniformly distributed dots 4 1 , and the plurality of dots 4 1 Made of high astigmatism material.

第7頁 1271582Page 7 1271582

該光擴散結構3 0分佈於該透光板2 〇之出射面2丨上，曰度為〇·卜〇· 2mm。該光擴散結構30由擴散性粉末與0膠制厚成，其可使自出射面21出射之光束擴散以提高均勻性'衣擴散性粉末係均勻混合於uv膠中。擴散性粉末係採用玻^ 或一氧化矽材料，其顆粒大小約為丨〇〜2 〇 # m。肖光源60發出的光線自透光板20之入射面25入射，被底面2 3之網點41散射後，自透光板2 〇之出射面2 1出射，和光擴散結構30之作用後均勻分佈。、工請芩閱第三圖，係本發明背光模組之第二實施方式，該背光模組100包括一光源2 6 0、一反射板70及一導光板 210。、其中導光板2 1 0及光源2 6 0結構及相對位置基本同第一實施方式，該導光板210包括一透光板220及一光擴散結構 230，該透光板220包括入射面225、出射面221及底面 223，其中出射面221係與底面223相對，且出射面221與底面223均與入射面225相交，透光板2 20之底面223具有複數均勻分佈之網點241，該反射板70位於導光板21 〇底面223 一側。同第一實施方式不同之處在於該透光板2 20之出射面 221具稜鏡（V-Cut)結構，該稜鏡（V-Cut)結構可將出射方向遠離導光板出射面2 2 1中心之光束往出射面2 2 1中心會聚，有效提高導光板210之傳導係數（Modulation Transfer Function, MTF)，從而亦可提高背光模組100之出光輝度。The light diffusing structure 30 is distributed on the exit surface 2 of the light-transmitting plate 2, and has a twist of 2 mm. The light diffusing structure 30 is made of a diffusing powder and a 0-gel, which diffuses a light beam emitted from the exit surface 21 to improve uniformity. The diffusing powder is uniformly mixed in the uv rubber. The diffusing powder is made of glass or cerium oxide, and its particle size is about 丨〇~2 〇 # m. The light from the illuminating light source 60 is incident on the incident surface 25 of the light-transmitting plate 20, is scattered by the halftone dots 41 of the bottom surface 23, and is emitted from the exit surface 2 1 of the light-transmitting plate 2, and is evenly distributed after the action of the light-diffusing structure 30. The second embodiment of the backlight module of the present invention includes a light source 206, a reflector 70, and a light guide 210. The light guide plate 210 includes a light transmissive plate 220 and a light diffusing structure 230. The light transmissive plate 220 includes an incident surface 225, and the light guide plate 210 includes a light transmitting plate 220 and a light diffusing structure 230. The exit surface 221 and the bottom surface 223, wherein the exit surface 221 is opposite to the bottom surface 223, and the exit surface 221 and the bottom surface 223 both intersect the incident surface 225. The bottom surface 223 of the light transmissive plate 20 has a plurality of uniformly distributed dots 241. 70 is located on the side of the bottom surface 223 of the light guide plate 21. The difference from the first embodiment is that the exit surface 221 of the light-transmitting plate 20 has a V-Cut structure, and the V-Cut structure can move the exit direction away from the light-emitting plate exit surface 2 2 1 The center beam converges toward the center of the exit surface 2 2 1 , effectively increasing the conduction coefficient (MTF) of the light guide plate 210 , thereby improving the light output of the backlight module 100 .

第8頁 1271582 五、發明說明（5) 光源260發出之光線從導光板2 10之入射面225進入後，部分光線經反射板70反射與光擴散結構2 30擴散後射出；部分光線經網點241散射與光擴散結構230擴散後射出。由於反射板70之反射作用，可提高背光模組1〇〇光源利用率。，惟，本發明之背光模組5 0亦有其他多種實施方式。如’可以於透光板2 〇與入射面2 5相對之一側進一步設置一光源6 0，亦可達到相同之效果。由於本發明背光模組中，導光板1 0具有分佈於出射面之擴散性粉末，可提供出射光束之均勻性，而無需額外採用擴散板等外部元件，使得結構簡單、組裝便捷、材料成本低，且可減少光束之損耗，進而改善背光模組之光學性能0 本發明導充分散射自出且該光擴散結光損耗，進而惟，本發中所揭示之形點之分佈可有之方向逐漸增據需要調整；請參閱第圖，其包括步使導光觸，減光學性於上述板亦可小、密之大小可相對導光板月曰材料擴散性板兼具少光線能背光模為楔形度可沿、密度出射面之製造或玻璃光板之光射面出射構與透光提南導光明之導光狀結構。多種形式加；該擴導光板之四圖，係驟：提供之光線，板直接接板之整體板並不限如，導光，如其大散性粉末入射面亦為本發明一合成樹擴散功能在介質處組實施方導光板；运離入射分佈亦可設置。方法流程製成之透Page 8 1271582 V. Description of the Invention (5) After the light emitted by the light source 260 enters from the incident surface 225 of the light guide plate 20, part of the light is reflected by the reflection plate 70 and diffused by the light diffusion structure 203, and is emitted; part of the light passes through the mesh point 241. The scattering and light diffusing structure 230 is diffused and emitted. Due to the reflection of the reflector 70, the utilization ratio of the backlight module 1 can be improved. However, the backlight module 50 of the present invention has other various embodiments. For example, a light source 60 can be further disposed on one side of the light-transmitting plate 2 〇 opposite to the incident surface 25, and the same effect can be achieved. In the backlight module of the present invention, the light guide plate 10 has diffusing powder distributed on the exit surface, which can provide uniformity of the outgoing beam without external components such as a diffusion plate, so that the structure is simple, the assembly is convenient, and the material cost is low. And the optical fiber performance of the backlight module can be improved by reducing the loss of the light beam. The invention can fully scatter the self-extraction and the light diffusion and light loss, and thus, the distribution of the shape points disclosed in the present invention can be gradually changed. The additional data needs to be adjusted; please refer to the figure, which includes the steps to make the light guide, the optical reduction in the above-mentioned plate can also be small, the size of the compaction can be relative to the light guide plate, the material diffusion plate and the light energy backlight mode is wedge-shaped The degree can be along the manufacturing of the density emitting surface or the light emitting surface of the glass light plate and the light guiding structure of the light guiding light guiding light. Various forms of addition; the four diagrams of the expansion light board, the system: the light provided, the board directly connected to the board is not limited, such as light guiding, such as its large powder incident surface is also a synthetic tree diffusion function of the invention The square light guide plate is implemented at the medium; the transport away from the incident distribution can also be set. Method flow

1271582 五、發明說明（6) 板（步驟11);將顆粒大小為10〜20 //m之擴散性粉末混合於 UV膠中，充分攪拌，其中擴散性粉末係採用玻璃或二氧化矽材料（步驟12);用淋幕塗佈機（Curtain c〇ating)將含有擴散性粉末之UV膠均勻塗佈於透光板之出射面，控制塗彿參數，使塗佈層厚度達到〇 · 1〜〇 · 2mm (步驟1 3 );用uv照射設備照射UV膠，使之硬化（步驟14)。本發明之導光板製造方法可進一步包括於透光板之底面形成複數網點之步驟01271582 V. Description of the invention (6) Plate (Step 11); a diffusing powder having a particle size of 10 to 20 //m is mixed in the UV glue and thoroughly stirred, wherein the diffusing powder is made of glass or cerium oxide material ( Step 12); uniformly coating the UV glue containing the diffusing powder on the exit surface of the light-transmitting plate with a curtain coating machine (Curtain c〇ating), and controlling the coating parameters to make the thickness of the coating layer reach 〇·1~ 〇· 2mm (Step 13); UV glue is irradiated with a UV irradiation device to harden it (Step 14). The light guide plate manufacturing method of the present invention may further comprise the step of forming a plurality of dots on the bottom surface of the light-transmitting plate.

综上所述，本發明確已符合發明專利之要件，爰依法提出專利申請三惟’以上所述者僅為本發明之較佳實施方式’ ^發明之範圍並不以上述實施方式為限，舉凡熟習本赛技勢之人士板依本發明之精神所作之等效修飾或變化，皆應涵蓋於以下申請專利範圍内。In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. The above description is only a preferred embodiment of the present invention. The scope of the invention is not limited to the above embodiment. Equivalent modifications or variations made by persons skilled in the art in the spirit of the present invention are intended to be included in the scope of the following claims.

第10頁 1271582Page 10 1271582

第11頁圖式簡單說明第一圖為先前技術背光模組之平面示意圖。第二圖為本發明背光模組第一實施方式之示意圖第二圖為本發明背光模組第二實施方式之示意圖第四圖為本發明導光板製造方法之流程圖。 [ 主要元件符號說明】導光板 10 Λ 210 透光板 20 ^ 220 光擴散結構 30 > 230 出射面 2卜 221 底面 23 223 入射面 25 > 225 網點 41 241 背光模組 50 ^ 100 反射板 70 光源 60 ^ 260Page 11 Schematic description of the diagram The first picture is a plan view of the prior art backlight module. The second embodiment is a schematic view of the first embodiment of the backlight module of the present invention. The second diagram is the schematic diagram of the second embodiment of the backlight module of the present invention. FIG. 4 is a flow chart of the method for manufacturing the light guide of the present invention. [ Description of main component symbols] Light guide plate 10 Λ 210 Translucent plate 20 ^ 220 Light diffusing structure 30 > 230 Exit surface 2 221 Bottom surface 23 223 Incident surface 25 > 225 Dot 41 241 Backlight module 50 ^ 100 Reflector 70 Light source 60 ^ 260

Claims

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1 · 一種背光模組，其包括：至少一光源；一導光板；1 . A backlight module, comprising: at least one light source; a light guide plate;

中，該導光板包括：一透光板，該透光板少一用以接收光束之入射面及一用以使光束出射之出射面· -光J散結構，該光擴散結構係由擴散：粉末及訂膠製成，其置於透光板之出射面係混合於該UV膠中，該至少— 入射面設置。該擴散性粉末光源相對透光板之 2·如申請專利範圍第1項所述之背光模組，苴散結構之厚度為0.卜0.2mm。〃 3·如申請專利範圍第1項所述之背光模組，苴性粉末顆粒大小為10〜20 口。〃中A擴政 4 ·如申清專利範圍第1項所述之背光模組，其中該擴散性粉末係玻璃或二氧化石夕材料。 5 ·如申請專利範圍第1項所述之背光模組，其中該導光板之出射面為稜鏡（V-Cut)結構。 6 ·如申請專利範圍第1項所述之背光模組，其中該背光模組進一步包括一反射板，該反射板位於導光板底面一側0The light guide plate comprises: a light transmissive plate, wherein the light transmissive plate has one incident surface for receiving the light beam and an exit surface for emitting the light beam, and the light diffusing structure is diffused: The powder and the binding material are prepared, and the exit surface of the light-transmitting plate is mixed in the UV glue, and the at least the incident surface is disposed. The diffusing powder light source is opposite to the light-transmitting plate. The backlight module according to the first aspect of the patent application has a thickness of 0. 〃 3. The backlight module described in claim 1 of the patent application has an alkaline powder particle size of 10 to 20 ports. In the backlight module of claim 1, wherein the diffusing powder is a glass or a dioxide dioxide material. The backlight module of claim 1, wherein the light exiting surface of the light guide plate is a V-Cut structure. 6. The backlight module of claim 1, wherein the backlight module further comprises a reflector, the reflector being located on a side of the bottom surface of the light guide plate.

7 · —種導光板，其包括·· 一透光板，該透光板包括至少一用以接收光束之入射面及一用以使光束出射之出射面；及7 - a light guide plate comprising: a light transmissive plate comprising at least one incident surface for receiving a light beam and an exit surface for emitting a light beam; and

第12頁 1271582 六、申請專利範圍一光擴製成合於 8.如中請係與出面輿該 9·如申請粉束係 I 0 ·如申含奮係與出 II ·如申請之出射 1 2 ·如申請結構之 1 3 ·如申請粉末顇 1 4 ·如申請粉末係一種導提供~ 入射提供一將混有塗佈 15. 其中該入射面其中該導光板其中該光擴散其中該擴散性其中該擴散性政結構’該光擴散結構係由擴散性粉末及Μ膠 ’其置於透光板之出射面，該擴散性粉末係混該UV膠中。專利範圍第7項所述之導光板，其中該入射面射面相交，該透光板進一步包括一底面，該底入射面相交，且具複數均勻分佈之網點。專利範圍第7項所述之導光板，其中該擴散性均勻混合於該UV膠中。專利範圍第7項所述之導光板射面相對。專利範圍第7項所述之導光板面為棱鏡（V - C u t )結構。專利範圍第7項所述之導光板厚度為0.1〜0.2mm 。專利範圍第7項所述之導光板粒大小為1 〇〜2 〇 // m。專利範圍第7項所述之導光板玻璃或二氧化矽材料。光板製造方法，其包括以下步驟：透光板，該透光板包括至少一用以接收光束之面及一用以使光束出射之出射面；混合有擴散性粉末之UV膠；擴散性粉末之UV膠塗佈於該出射面上，形成一層；Page 12 1271582 VI. Application for Patent Scope 1. Light expansion into 8. If you want to contact and 出舆 9 · 如如如如如如如如如如如如如如如如如如如如如如如如如如如如如如申请申请申请申请申请申请If the application structure is 1 3 · If applying powder 顇 1 4 · If the application powder is a guide provided ~ the incident provides a mixed coating 15. wherein the incident surface is where the light diffuses the light diffused therein The diffusive political structure 'the light diffusing structure is made of a diffusing powder and a silicone rubber' placed on the exit surface of the light-transmitting plate, and the diffusing powder is mixed in the UV glue. The light guide plate of claim 7, wherein the incident surface faces intersect, the light transmissive plate further comprising a bottom surface, the bottom incident surfaces intersecting, and having a plurality of uniformly distributed dots. The light guide plate of claim 7, wherein the diffusibility is uniformly mixed in the UV glue. The light guide plate described in item 7 of the patent scope is opposite to the surface. The light guide plate surface described in item 7 of the patent scope is a prism (V - C u t ) structure. The thickness of the light guide plate described in item 7 of the patent range is 0.1 to 0.2 mm. The light guide plate size described in item 7 of the patent scope is 1 〇~2 〇 // m. The light guide plate glass or cerium oxide material according to item 7 of the patent scope. The light board manufacturing method comprises the following steps: a light transmissive plate comprising at least one surface for receiving a light beam and an exit surface for emitting a light beam; a UV glue mixed with a diffusing powder; a diffusing powder UV glue is coated on the exit surface to form a layer;

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