1277805 九、發明說明： 【發明所屬之技術領域】 1本發明係關於背光模組，尤其係關於一種出光均勻度高、光學性能優良之 導光板及背光模組。 【先前技術】1277805 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a backlight module, and more particularly to a light guide plate and a backlight module having high uniformity of light output and excellent optical performance. [Prior Art]
月光模組(Backlight Module)係液晶顯示器面板(Liquid Crystal Display Panel，簡稱LCD Panel)之關鍵零組件，由於液晶本身並不會發光，背光模組 之功肖b便在於供應輝度充分與分佈均勻之光源，使面板能夠正常顯示影像。一 般而言，背光模組可分爲“直下式，，與“側光式”兩種設計。 直下式設計係將燈管置於背光模組正下方，而因安置空間變大，可使用兩 支或兩支以上之燈管來增加光源輝度，但相對地也增加了背光模組之厚度與重 量。同時多支燈管也增加耗電量，因而較適用於對可攜性及空間要求不挑剔之 LCD顯示器或LCD電視。 一而採用側光式設計之背光模組，如第一圖，其具有導光板u、光源、 反，罩13、反射片14、擴散片15以及二棱鏡片16。通常僅採用單支冷陰極 、且言作爲光源I2 ’並利用呈楔形设計之導光板U來力口強對光線行進方向進行 控制，難度相對較高。而此種設計係考慮“輕”、“薄，，“省電，，等使用者之需求， 故現階段主要用於筆記本電腦用之LCD面板。 如第—圖所不，在背光模組丨之光源12之兩端電極部妙法發光， ^無效發光區，導致較少之光線進入背光模組a之與光源 =,區域中，從而料使背光模組i靠近光源12兩端電極121之部位產生 ‘ 121?爲了解決這侧題’通常係通過將絲12之長度增長，或係將光 照之細，但兩者改#之效果皆有^且12 或將拉讀會增加LCD面板轉之面積，械健界所不樂見。 致進入二能量之損耗以及導光板11内部無之反射，也常導 暗=月伽且i之运離光源12兩端之角落區域光能量不足，而形成另兩處 【發明内容】 有鏗於此，有必要提供-種能有效解決背光模組暗角問題、提高背光模組 5 1277805 輝度與均勻度之導光板及背光模組。 -種導光板，包括-人絲一與人光面相連之岐面和— 之底面；該入光面兩端設置複數第一突起，其用於增大 、 ㈣—卿二突== 所述出光面遠離所述入光面之兩端設置有第三突起。 -種背光模組，包括-光源及引導該光源所發出光之導光板， 括至少-入光面、-與入光面相連之出光面及—與出光面相對之底面= 3兩端設置複數第-突起，其用於增大光線入射之面積及擴散光線，·該=$ 該入光面之兩端設置複數第二突起，其躲麵直柏上針^出射光 所述出光面遠離所述入光面之兩端設置有第三突起。 相較於先前技術，所述導光板之入光面設置了第一突起結 光源卜般爲冷陰極燈管)電極兩端之人光面之人射面積，同時第 將入射光聽之個，可以使财之絲量進人導雜#近光 角落。在導光板出光面靠近光源兩端設置第二突起結構，可以= 之第-突起結構相互配合，有效解轉光域近人光 1韻入先面 更進-步地，所述導光板出光面遠離入光面之兩端設二角^ 作用原理與帛二突起賴#贿鱗級雜辆兩端^肖=’其 相對於先前技術，所述背光模組之縣板入光面之第 角°° 二突起共同作用，大大減少了背光模組之靠近光源兩端之暗角問題出先面之第 進-步地，麻絲顯巾之導級出光面絲人絲 — 起結構，有效解決背級组遠離光源兩端之暗 5^第:大 輝度與均勻度。 Λa刀口 f才光杈組之 【實施方式】 下面將結合附圖，對本發明作進一步之詳細說明。 請參閱第三圖，爲本發明之第—實施例提供之導光板21。 6 1277805 導光板21可以爲楔型或平板型等，本實施例採用平板型。該導光板21包 括：一設置於導光板21—側面之入光面211 ; —與入光面211相連之出光面212 及與出光面212相對之底面213。其中入光面211兩端設置有複數第一突起 $lla，在出光面212靠進入光面211之兩端之區域設置複數第二突起212a ;底面 213可以具有網點或溝槽結構等。 • 請參閱第四圖，爲本實施例導光板21之入光面211之放大立體圖。請結合 ; 第三圖，其中入光面211沿入光面與出光面212交線方向之長度爲L，入光面的 長度方向與長度L方向相同。第一突起211a在入光面211其中一端之區域長度爲 。其中長度L1範圍小於長度L之四分之一；入光面211另一端之第一突起2lia φ 區域長度範圍與長度L1相同。 第一突起211a為五面體角柱結構，在與出光面212平行方向上之截面爲三 角形’該三角形中與入光面211相對之頂角…之範圍爲6〇〇~15〇〇。一般地，沿 靠近入光面211兩端之方向頂角A1減小。 請參閱第五圖，爲本實施例中導光板21之出光面212上第二突起212a之放 大立體圖。該第二突起212a爲四面體角錐結構。第二突起212a之底面三角形之 一邊設置於出光面212之與入光面211垂直之一條邊上或者與此邊平行，包含此 邊之側面三角形中與此邊相對之頂角A2之範圍爲45。〜175。。 請參閱第六圖，爲導光板21在第一突起21la部分之光路圖。入射光線la • 由外界(空氣)進入導光板21，即爲入射光線以由光疏介質進入光密介質，入射 角爲α ’折射光線2a與法線3a夾角爲折射角万；空氣之折射率爲以，導光板之 折射率爲π2 ’貝i]nl<n2。由折射定律nisina=n2sin/3，則入射角α>折射角/3, 即折射光線2a相對於入射方向沘偏向法線如，使入射光線“經折射後變得發 散。 、 晴參閱第七圖，爲本實施例中導光板21出光面212之俯視圖。出光面212 ，長度方向與長度L之方向相同。出光面212沿與長度L方向相垂直之方向寬度 、 爲1，出光面212之寬度方向與寬度W之方向相同。第二突起212a沿寬度W方 平行排列該複數第一突起212a在長度L方向之長度L2小於長度L之四分之 一，在寬度W方向寬度W2小於寬度W之三分之一。 相對於先前技術，本實施例所提供之導光板21入光面211兩端之第一突起 7 1277805 211a使入射面211兩端之入光面積增加，使得進入導光板21靠近入光面211兩端 之角落之光線增加，且第一突起211a使得光線進入導光板後變得發散，使光在 導光板21靠近入光面211兩端之角落擴散開來，使更多之光能量進入此兩個角 ^區域。同時出光面212光線由導光板21出射到外界空氣，即光線由光密介質 進入到光疏介質，第二突起212a之結構類似於第一突起211a，使光線集中，所 - 以使導光板21靠近入光面211兩端之角落區域獲得更多之光能量。從而第一突 起2lla和第二突起212a有效解決導光板21靠近入光面211兩端之暗角問題，同 、 時增加了導光板21之出光輝度和均勻度。 、 當然，第一突起211a在與出光面212平行方向上之截面並不限於三角形， _ 截面爲梯形之突起也可以達到相同之功效，且第一突起211a之間可以設置間 距，也可以不設間距。第二突起212a並不限於四面體角錐，其他多面體角錐之 突起也可以達到相同之功效。該第一突起211a和第二突起212a可以和導光板21 一體成型，也可以採用V切削(V-cutting)技術形成。 請參閱第八圖，爲本發明第二實施例導光板31。 導光板31與第一實施例中之導光板21主要不同之是，導光板31在出光面 312上遠離入光面mi之兩端設置有複數第三突起312b。第二突起31%和第三突 起312b皆與第一實施例中之第二突起212a相同。 請參閱第九圖，爲本實施例導光板31之出光面312之俯視圖。出光面312 沿與入光面311平行之方向長度爲L，，出光面312沿與長度L，方向垂直之方向寬 度爲W’。第二突起312a和第三突起312b分別都沿W，方向平行排列。該複數第 二突起312a在L’方向長度L2’小於長度L，之四分之一，在w，方向寬度”2，小於 寬度W’之三分之一。第三突起312b沿W，方向平行排列。該複數第二突起312a 在L’方向長度L3’小於長度L，之四分之一，在W，方向寬度W3，小於寬度w，之三 分之一。 相對於先前技術之導光板，本實施例所提供導光板31入光面311兩端之第 ' 一突起施和出光面312表面之第二突起3似之結構使導光板31靠近入光面 3ΐι兩端之角落區域獲得更多之光能量，有效解決導光板S1靠近入光面3ΐι兩端 之暗角問題；出光面312上之第三突起312b與第二突起处之作用原理相同， 使得導光板31遠離入光面311之兩角落集中更多之光能量，從而解決了導光板 8 1277805 31遠離入光面311之兩端之暗角問題。第一突起311&、 起312b共同作用，有效消除了導光板31之四 2二突起312a、第三突 光輝度和均勻度。 H時增加了導光板31之出 v當然，第三突起312b並不限於四面體鱗，其他 以達到相同之功效。該第三突起312b可以和導 體角錐之突起也可The Backlight Module is a key component of the Liquid Crystal Display Panel (LCD Panel). Since the liquid crystal itself does not emit light, the function of the backlight module is that the supply brightness is sufficient and evenly distributed. The light source enables the panel to display images properly. In general, the backlight module can be divided into two types: “straight down type, and “side light type”. The direct type design system places the lamp tube directly under the backlight module, and because the installation space becomes larger, two can be used. Supporting more than two lamps to increase the brightness of the light source, but relatively increasing the thickness and weight of the backlight module. At the same time, multiple lamps also increase power consumption, so it is more suitable for portability and space requirements. A discerning LCD display or an LCD TV. A backlight module with an edge-lit design, as shown in the first figure, has a light guide plate u, a light source, a reverse cover, a reflector 13, a reflection sheet 14, a diffusion sheet 15, and a prism sheet 16. Usually only a single cold cathode is used, and it is used as the light source I2' and the light guide plate U with a wedge-shaped design is used to control the direction of light travel, which is relatively difficult. This design considers "light". "Thin," "Power saving," and other user needs, so at this stage is mainly used for LCD panels for notebook computers. As shown in the first figure, the electrode part of the light source 12 of the backlight module is fine. Luminous, ^ ineffective illuminating area, resulting in less The light enters the backlight module a and the light source=, the area, so that the backlight module i is close to the electrode 121 at both ends of the light source 12 to generate '121? In order to solve this problem, the length of the wire 12 is usually increased. , or the light will be fine, but the effect of both changes to ^ and 12 or will read will increase the area of the LCD panel to turn, the mechanical health community is not happy. To the loss of the second energy and the light guide plate 11 There is no reflection inside, and it often leads to dark = month gamma and i is transported from the corners of the two ends of the light source 12, and the light energy is insufficient, and the other two are formed. [Inventive content] In view of this, it is necessary to provide - can effectively solve The backlight module has a problem of the vignetting angle, the light guide plate and the backlight module for improving the brightness and uniformity of the backlight module 5 1277805. The light guide plate comprises a bottom surface of the human silk connected to the human light surface and the bottom surface thereof; A plurality of first protrusions are disposed at both ends of the smooth surface for increasing, (4)-clearing the second protrusion== the light-emitting surface is provided with a third protrusion away from the two ends of the light-incident surface. a light source and a light guide plate guiding the light emitted by the light source, including at least a light incident surface, - and The light-emitting surface connected to the light-incident surface and the bottom surface opposite to the light-emitting surface = 3 are provided with a plurality of first-protrusions at both ends for increasing the incident area of the light and diffusing the light, which is set at both ends of the light-incident surface a plurality of second protrusions, which are disposed on the surface of the light-emitting surface, and are provided with a third protrusion away from the two ends of the light-incident surface. Compared with the prior art, the light-incident surface of the light guide plate is disposed. The first protruding junction light source is a cold cathode fluorescent tube) the human light surface of the human light surface at both ends of the electrode, and at the same time, the first incident light is heard, and the volume of the silk can be made into the human light. The light-emitting surface of the light guide plate is disposed near the two ends of the light source, and the second protrusion structure can be matched with each other, and the first-protrusion structure can cooperate with each other to effectively displace the light-domain near-human light into the first surface, and the light-emitting surface of the light guide plate is far away. The two ends of the light-incident surface are provided with two angles. The principle of action and the two protrusions of the two sides of the light-emitting surface of the light-emitting surface are the same as the prior art, and the angle of the light-emitting surface of the county plate of the backlight module is °. ° The two protrusions work together to greatly reduce the vignetting problem of the backlight module near the two ends of the light source. The first progress - further, the guide stage Masi napkins significantly the surface rayon yarn - from the structure, an effective solution to the back ends of the dark level set away from the first light source 5 ^: large brightness and uniformity. Λa cutting edge f-lighting group [Embodiment] The present invention will be further described in detail below with reference to the accompanying drawings. Please refer to the third figure, which is a light guide plate 21 according to a first embodiment of the present invention. 6 1277805 The light guide plate 21 may be a wedge type or a flat type, etc., and the embodiment adopts a flat type. The light guide plate 21 includes a light incident surface 211 disposed on the side surface of the light guide plate 21, a light exit surface 212 connected to the light incident surface 211, and a bottom surface 213 opposite to the light exit surface 212. A plurality of first protrusions $11a are disposed at both ends of the light-incident surface 211, and a plurality of second protrusions 212a are disposed in a region of the light-emitting surface 212 at both ends of the light-incident surface 211. The bottom surface 213 may have a dot or a groove structure. Please refer to the fourth figure, which is an enlarged perspective view of the light incident surface 211 of the light guide plate 21 of the embodiment. In the third diagram, the length of the light incident surface 211 along the line of intersection of the light incident surface and the light exit surface 212 is L, and the length direction of the light incident surface is the same as the length L direction. The length of the first protrusion 211a at one end of the light incident surface 211 is . The length L1 range is less than a quarter of the length L; the first protrusion 2lia φ region at the other end of the light incident surface 211 has the same length range as the length L1. The first protrusion 211a has a pentahedral corner column structure, and has a triangular cross section in a direction parallel to the light exit surface 212. The apex angle of the triangle opposite to the light incident surface 211 ranges from 6 〇〇 to 15 。. Generally, the apex angle A1 decreases in a direction close to both ends of the light incident surface 211. Referring to FIG. 5, an enlarged perspective view of the second protrusion 212a on the light exit surface 212 of the light guide plate 21 in the embodiment is shown. The second protrusion 212a is a tetrahedral pyramid structure. One side of the bottom surface of the second protrusion 212a is disposed on or adjacent to one side of the light-emitting surface 212 perpendicular to the light-incident surface 211, and the apex angle A2 of the side triangle including the side opposite to the side is 45. . ~175. . Please refer to the sixth figure, which is an optical path diagram of the portion of the light guide plate 21 at the first protrusion 21la. Incident light la • From the outside (air) into the light guide plate 21, that is, incident light to enter the optically dense medium by the light-diffusing medium, the incident angle is α 'the angle between the refracted light 2a and the normal line 3a is the refraction angle 10,000; the refractive index of the air Therefore, the refractive index of the light guide plate is π 2 'bei] nl < n2. From the law of refraction nisina=n2sin/3, the incident angle α> the refraction angle/3, that is, the refracted ray 2a is biased toward the normal with respect to the incident direction 如, so that the incident ray “is diverged after being refracted. A plan view of the light-emitting surface 212 of the light guide plate 21 in the present embodiment. The light-emitting surface 212 has the same length direction as the length L. The width of the light-emitting surface 212 in the direction perpendicular to the length L direction is 1, and the width of the light-emitting surface 212 is The direction is the same as the direction of the width W. The second protrusions 212a are arranged in parallel along the width W, and the length L2 of the plurality of first protrusions 212a in the length L direction is less than a quarter of the length L, and the width W2 is smaller than the width W in the width W direction. With respect to the prior art, the first protrusions 7 1277805 211a at both ends of the light incident surface 211 of the light guide plate 21 provided by the present embodiment increase the light incident area at both ends of the incident surface 211, so that the light guide plate 21 is approached. The light of the corners of the two ends of the light incident surface 211 is increased, and the first protrusion 211a causes the light to become diverged after entering the light guide plate, so that the light spreads out at the corners of the light guide plate 21 near the two ends of the light incident surface 211, so that more Light energy enters this At the same time, the light exiting surface 212 is emitted from the light guide plate 21 to the outside air, that is, the light enters the light-diffusing medium from the light-tight medium, and the structure of the second protrusion 212a is similar to the first protrusion 211a, so that the light is concentrated. - obtaining more light energy in the corner region of the light guide plate 21 near the two ends of the light incident surface 211. Thus, the first protrusion 2lla and the second protrusion 212a effectively solve the problem of the vignetting angle of the light guide plate 21 near the light incident surface 211. At the same time, the light transmittance and uniformity of the light guide plate 21 are increased. Of course, the cross section of the first protrusion 211a in the direction parallel to the light exit surface 212 is not limited to a triangle, and the protrusion having a trapezoidal cross section can achieve the same effect. The distance between the first protrusions 211a may or may not be set. The second protrusions 212a are not limited to the tetrahedral pyramids, and the protrusions of other polyhedral pyramids may achieve the same effect. The first protrusions 211a and the second protrusions 212a It may be integrally formed with the light guide plate 21, or may be formed by a V-cutting technique. Referring to the eighth embodiment, the light guide plate 31 of the second embodiment of the present invention is provided. The light guide plate 21 in the embodiment is mainly different in that the light guide plate 31 is provided with a plurality of third protrusions 312b on both ends of the light exit surface 312 away from the light incident surface mi. The second protrusion 31% and the third protrusion 312b are both first and first. The second protrusions 212a are the same in the embodiment. Referring to the ninth embodiment, a plan view of the light-emitting surface 312 of the light guide plate 31 is shown. The length of the light-emitting surface 312 in the direction parallel to the light-incident surface 311 is L, and the light-emitting surface 312. The width in the direction perpendicular to the length L and the direction is W'. The second protrusion 312a and the third protrusion 312b are respectively arranged in parallel along the W direction. The length L2' of the plurality of second protrusions 312a in the L' direction is less than the length L, one quarter of which is at w, the direction width "2" is less than one third of the width W'. The third protrusion 312b is parallel along the W direction. The length L3' of the plurality of second protrusions 312a in the L' direction is less than the length L, one quarter of which is in the W, the direction width W3 is less than one third of the width w. Compared to the prior art light guide plate, In the embodiment, the second protrusion 3 on the surface of the light incident surface 311 and the second protrusion 3 on the surface of the light exit surface 312 are arranged to make the light guide plate 31 close to the corners of the light incident surface 3ΐ. The light energy effectively solves the problem of the vignetting angle of the light guide plate S1 near the light-incident surface 3ΐ; the third protrusion 312b on the light-emitting surface 312 and the second protrusion have the same principle, so that the light guide plate 31 is away from the light-incident surface 311. The two corners concentrate more light energy, thereby solving the problem of the vignetting angle of the two ends of the light guide plate 8 1277805 31 away from the light incident surface 311. The first protrusions 311 & 312b cooperate to effectively eliminate the light guide plate 31 4 Two protrusions 312a, third brightness and uniformity When H is added, the light guide plate 31 is increased. Of course, the third protrusion 312b is not limited to the tetrahedral scale, and the others can achieve the same effect. The third protrusion 312b and the protrusion of the guide pyramid can also be used.
切削(V-cutting)技術形成。 成型，也可以採用V 請參閱第十圖，本發曰月還提供了第三實施例之_ 施例之導光板21和光源22。 、、 八匕括第一實Cutting (V-cutting) technology is formed. For molding, it is also possible to use V. Referring to the tenth figure, the light guide plate 21 and the light source 22 of the third embodiment are also provided. , and the first one
光源22相對並平行於入光面211設置，通常僅採用—支冷 光板^紐解，還可轉„二實施财之導紐31來储背光歡2中之導 练上所述，本發明確已符合發明專利之要件，麦依法提出專利申請。惟， 以上所述者縣本發明之健實財式，本發社細並砂上述實施方 限，舉凡熟習本案技藝之人士援依本發日月之精神所作之等效修飾或變化應 涵蓋於以下申請專利範圍内。 μ 1277805 【圖式簡單說明】 第一圖爲先前技術背光模組之立體圖。 ，第二圖爲先前技術背光模組之俯視圖。 *第二圖爲本發明第一實施例導光板之立體圖。 第四圖爲本發明第—實施例導光板之人絲放大立體圖。 ’ 第五圖爲本發明第一實施例導光板出光面第二突起之放大 第六®爲本發明第-實施例巾第-突起之光路示意圖。 第七圖爲本發日㈣—實施例導光板出光面之俯視圖。 ， 第八圖爲本發明第二實施例導光板之立體圖。 • 第九圖爲本發明第二實補導光板之出光面俯視圖。 第十圖為本發明第三實施例背光模組之立體圖。 【主要元件符號說明】 入射光線la 背光模組 2 導光板21，31 入光面 211, 311 第一突起 211a，311a 出光面 212, 312 第二突起 212a，312a 第三突起 312b 底面 213 光源 22 出射光線2a 法線 3aThe light source 22 is disposed opposite to and parallel to the light incident surface 211, and generally only adopts a cold light plate to solve the problem, and can also be transferred to the second guide of the financial guide 31 to store the backlight in the backlight 2, the present invention does Has met the requirements of the invention patent, Mai filed a patent application. However, the above-mentioned county and the invention of the health and wealth, the hair of the company and the above implementation limits, for those who are familiar with the skill of the case, according to the date of this Equivalent modifications or changes made by the spirit of the month shall be covered by the following patent application. μ 1277805 [Simplified illustration] The first picture is a perspective view of a prior art backlight module. The second picture is a prior art backlight module. The second view is a perspective view of a light guide plate according to a first embodiment of the present invention. The fourth figure is an enlarged perspective view of a human light guide plate of the first embodiment of the present invention. The fifth figure is a light guide plate of the first embodiment of the present invention. The sixth embodiment of the surface second protrusion is a schematic diagram of the light path of the first protrusion of the first embodiment of the present invention. The seventh figure is a top view of the light-emitting surface of the light guide plate of the present invention (4). Second implementation The ninth figure is a top view of the light-emitting surface of the second practical light guide plate of the present invention. The tenth figure is a perspective view of the backlight module of the third embodiment of the present invention. [Main component symbol description] Incident light la backlight module 2 light guide plates 21, 31 light incident surface 211, 311 first protrusions 211a, 311a light emitting surface 212, 312 second protrusions 212a, 312a third protrusion 312b bottom surface 213 light source 22 outgoing light 2a normal 3a