1264596 九、發明說明： 【發明所屬之技術領域】 一本發明係關於-種背光模組，尤指一種出光 南之採用燈管之直下式背光模組。 又又 【先前技術】 由於液晶顯示器具輕、薄、耗電小等優點，廣 電腦、行動電話、個人數位助理等現代化資：¾ 2供4:晶顯示器中的液晶本身不具發光特性，需為： 純組以實現㈣魏。#光额可按結構側 先式月光模組及直下式背光模組二種。其令，直下式北 杈組主要應用在LCD監視器或液晶電視等領域。 月 -出==直下式背光模組需具有較高之出光輝度， 先均句度要達到預定需求，從而提昇液晶顯示器的色 Ϊ及屏11域亮度效果及整機的可視角度。其耗電 本：…降低，另外，為適應液晶顯示器輕、薄 的要求，其結構設計不能太過複雜。 袓成2技術之直下式为光模組一般包括複數發光二極體 :成=車列與置於光源陣列出光面-側的散射面板 准知用發光二極體之直下式背光模組具有缺陷·· 極體之價格向，增加直下式背 呈旋轉對_ & L A 錢、、且之成本，其光場分佈 且為勾度難以達到液晶顯示器之需求； 且為匹配放射面板，需採用複數 光:原:列體積大、結構複雜且耗電量大，並 一極體出現故障時會影響整體出光均勻度。、χ 因此，業界發展出採用燈管作$光源之直下式背光 1264596 、且。一種先前技術直下式背光模組可參閱公告於1 995年12 月26曰之美國專利第5, 479, 328號（第一圖參照）。該直下 式背光模組10為液晶顯示面板2〇提供照明，包括螺旋形燈 管（Serpentine Tube) 12、反射框體14、玻璃基板15、設 置於玻璃基板15之上的擴散板17及增亮片18，該螺旋形燈 管12嵌套於反射框體14之複數通道（未標示）中。該增= 片18藉由空氣間隙19與液晶顯示面板2〇相對。 儿 惟丄該先前技術直下式背光模組1〇具有缺陷：為達到符合 預定要求之出光均勾度，該反射框體14之設計殊為不易， 增加直下式背光模組1〇結構之複雜度；該螺旋形燈管。之 外形複雜，製作較為困難，且價格及耗電量較高。 有鑑於此，提供一種出光均勻度高、成本低、 小之直下式背光模組實為必要。 電里 【發明内容】 種出光均勻度高、成本低、 本發明之目的在於提供一種出 耗電量小之直下式背光模組。 本發明首下式择土抬一 A k ^ &1264596 IX. Description of the invention: [Technical field to which the invention pertains] A invention relates to a backlight module, and more particularly to a direct-lit backlight module using a light tube. Moreover, [prior art] Due to the advantages of light, thin, and low power consumption of liquid crystal display devices, modern computers such as computers, mobile phones, and personal digital assistants: 3⁄4 2 for liquid crystals in 4: crystal displays do not have illuminating properties, : Pure group to achieve (four) Wei. #光额 can be based on the structure side First moonlight module and direct type backlight module. Therefore, the direct-type Beibei group is mainly used in the fields of LCD monitors or LCD TVs. The month-out == direct-lit backlight module needs to have a high light-emitting brightness, and the first-order sentence should reach the predetermined requirement, thereby improving the color of the liquid crystal display and the brightness of the screen 11 and the viewing angle of the whole machine. Its power consumption: ... reduced, in addition, in order to adapt to the light and thin requirements of liquid crystal displays, its structural design can not be too complicated. The direct-type optical module of the 袓2 technology generally includes a plurality of light-emitting diodes: a direct-type backlight module with a light-emitting surface disposed on the light-emitting surface of the light source array, and a direct-type backlight module having a light-emitting diode ·································································································· Light: Original: The column is large in size, complicated in structure, and consumes a large amount of electricity. When a pole fails, it will affect the overall uniformity of light output. χ Therefore, the industry has developed a direct-lit backlight 1264596 using a light tube as a light source. A prior art direct-lit backlight module can be found in U.S. Patent No. 5,479,328, issued toK. The direct type backlight module 10 provides illumination for the liquid crystal display panel 2, including a spiral tube (Serpentine Tube) 12, a reflective frame 14, a glass substrate 15, a diffusion plate 17 disposed on the glass substrate 15, and a brightness enhancement sheet. 18. The spiral tube 12 is nested in a plurality of channels (not labeled) of the reflective frame 14. The increase 18 is opposed to the liquid crystal display panel 2 by the air gap 19. However, the prior art direct type backlight module 1 has a defect: the design of the reflective frame 14 is not easy in order to achieve the uniformity of the light exiting the predetermined requirements, and the complexity of the structure of the direct type backlight module is increased. ; the spiral tube. The shape is complicated, the production is difficult, and the price and power consumption are high. In view of this, it is necessary to provide a direct-lit backlight module with high uniformity of light output and low cost. [Invention] The present invention aims to provide a direct type backlight module which consumes less power and has a low uniformity and low cost. The first type of the invention is selected to lift the soil A k ^ &
該框架包括内表面， 罩、線性The frame includes the inner surface, cover, and linear
透鏡本體與複數突起， 的一侧，該燈管及燈J 定之區域内，燈管發出之光線與燈^ 菲涅耳透鏡片轉換成均勻之面光源。 該内表 本發明進一步改進在於：該框架 面形成黑版（Black Printing)。 1264596 其中，該線性菲淫耳透鏡片之邊緣具内部全反射 (Total Internal Reflection，TIR)結構。 其中，該複數突起的截面為三角形、梯形或圓弧形。 其中，該燈管係冷陰極螢光燈管（c〇ld cath(Dde Florescent Lamp ， CCFL) ° 其中，該燈罩之内表面鍍覆一層反射膜。 其中’該燈罩與框架一體成型。 其中，該直下式背光模組還包括擴散板，擴散板位於 透鏡本體設置突起的一侧。 —與先前技術相比，本發明直下式背光模組由於採用線 性菲涅耳透鏡片，可提昇直下式背光模組之出光均勻度； 並且由於採單一燈管的設計，其成本低、耗電量小。另外， 本發明還具有機構設計簡單的優點。 【實施方式】 凊參閱第二圖，本發明直下式背光模組丨〇〇包括燈管 120、部份圍繞燈管120之燈罩13〇、線性菲涅耳透鏡片14〇、 擴散板150及框架110。該燈管12〇及燈罩13〇位於框架丨^ 與線^菲涅耳透鏡片140所界定之區域内，擴散板150位於 線性菲涅耳透鏡片14〇一側，燈管12〇發出之光線與燈罩1训 反射之光線經由線性菲涅耳透鏡片140及擴散板150後轉換 成均勻之面光源。 該燈官120可為冷陰極螢光燈。CCFL相較於其他光源技 術具有輝度較高且發光效率高、管徑細、壽命長、等優點。 忒燈官120之管徑約為1〇匪，功率約為8 —29w，壽命長達 lOOOOhrs，光通量約為 35-901m。 1264596 CCFL的發光原理與日光燈管相似，依靠燈内氣體原子 =能態轉換成輻射發光。最常用的放電介質為汞蒸氣，燈 &内會填充惰性氣體如Ar、Kr、Ne等輔助啟動，燈管内的 遊離電子被電場加速而激發Ar原子，受激的紅再使汞原子 遊離而放出輻射能，主要產生253.711111與1851111]兩種紫外光 ^UV Radiation)，其中235· 7 nm之輻射效率最大，經激發 巨壁之螢光體後發光，藉由調整螢光體之配方，可發出不 同色溫的光線，如偏紅或偏藍以符合不同顯示器之要求。 該燈罩130之作用在於部份包圍燈管12〇，反射燈管12〇 發出光源，盡量將光源送入線性菲涅耳透鏡片14〇内。 、该線性菲涅耳透鏡片140其實是一種，，大孔徑”的消球 差透鏡其光學作用與普通凸透鏡相當，但比凸透鏡薄、 重里輕。線性菲涅耳透鏡片14〇包括透鏡主體141與複數突 起142，該複數突起142設置於透鏡主體141背對燈管12〇的 侧，其截面為三角形。設計時，環數的選擇至關重要。 線I*生菲&耳透鏡片140環數越多，有助於減小球差及透鏡厚 度，使光斑更均勻。 一該框架110用於收容燈管120與燈罩13〇,並起支撐線性 菲/土耳透鏡14G的作用。為防止光線自框架n◦折射出去， 吸收遊離於框架110與線性菲淫耳透鏡片14〇之間的漫射 光’框架110之内表面丨丨丨形成黑版。 叫一併參閱第三圖，工作時，燈管120發出光線，部份 光線直接人射至線性菲料透鏡#14()，其餘光線經燈罩 130反射後同樣入射至線性菲涅耳透鏡片14〇。線性菲涅耳 透鏡片14G將紐準直為平行光，同時使其擴散 ，均勻分佈 1264596 於出光區域’形成所需之面光源。擴散板150位於線性菲埋 耳透鏡片14卜側，用以進—步提昇出射光之均勾度 惟，本發明直下式背光模組還可以有其他改進或替換 之實把方式。如，在線性菲⑤耳透鏡片丨4Q之邊緣部位採用 内=全反射結構。因為，對於線性菲淫耳透鏡片丨姆說， 越靠近邊緣，光線人射至透鏡㈣度越大，反射損失成份 也越大’若採用TIR結構，可使入射角度接近〇度，大大減 少透鏡邊緣光的反射損失，有利於使透鏡呈現更為均勾昭 亮的外觀。該燈罩130内表面可鑛覆一層高反射膜層。該燈 罩130可與框架110一體成型。該突起142的截面亦可為梯形 或圓弧形。 综上所述，本發明確已符合發明專利要件，爰依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施方式， 牛凡热‘本案技藝之人士，在援依本案發明精神所作之等 效修飾或變化，皆應包含於以下之申請專利範圍内。 【圖式簡單說明】 第一圖係先前技術直下式背光模組之剖視圖。 第二圖係本發明直下式背光模組之立體圖。 第三圖係本發明直下式背光模組之光路示意圖。 【主要元件符號說明】 背光模組 1〇〇 框架 110 燈管 120 燈罩 130 線性菲涅耳透鏡片140 擴散板 150 10 1264596 框架内表面 111 透鏡主體 141 突起 142In the region of the lens body and the plurality of protrusions, the lamp tube and the lamp J, the light emitted by the lamp and the lamp Fresnel lens sheet are converted into a uniform surface light source. The present invention is further improved in that the frame surface forms a black printing. 1264596 wherein the edge of the linear spectacles lens has an internal total reflection (TIR) structure. The cross section of the plurality of protrusions is triangular, trapezoidal or circular arc. Wherein, the lamp is a cold cathode fluorescent lamp (C〇ld cath (Dde Florescent Lamp, CCFL) °, wherein the inner surface of the lampshade is coated with a reflective film. wherein the lampshade is integrally formed with the frame. The direct type backlight module further includes a diffusion plate located on a side of the lens body where the protrusion is disposed. The direct type backlight module of the present invention can improve the direct type backlight mode by using a linear Fresnel lens sheet as compared with the prior art. The light uniformity of the group; and the design of the single lamp tube is low in cost and low in power consumption. In addition, the invention has the advantages of simple mechanism design. [Embodiment] Referring to the second figure, the direct type of the invention The backlight module includes a lamp tube 120, a lamp cover 13 partially surrounding the lamp tube 120, a linear Fresnel lens sheet 14A, a diffusion plate 150, and a frame 110. The lamp tube 12 and the lamp cover 13 are located in the frame 丨^ In the region defined by the line Fresnel lens sheet 140, the diffusing plate 150 is located on the side of the linear Fresnel lens sheet 14, and the light emitted by the tube 12 and the light reflected by the lamp cover 1 are transmitted via the linear Fresnel. The lens 140 and the diffuser 150 are converted into a uniform surface light source. The lamp 120 can be a cold cathode fluorescent lamp. CCFL has higher luminance, higher luminous efficiency, thinner diameter, longer life, etc. than other light source technologies. Advantages: The lamp diameter of the lamp 120 is about 1〇匪, the power is about 8-29w, the life is up to lOOOOhrs, and the luminous flux is about 35-901m. 1264596 The principle of CCFL is similar to that of fluorescent tubes, relying on the gas atoms in the lamp = The energy state is converted into radiation. The most commonly used discharge medium is mercury vapor, and the lamp & is filled with an inert gas such as Ar, Kr, Ne, etc., and the free electrons in the lamp are accelerated by the electric field to excite Ar atoms, stimulated. The red color then releases the mercury atoms and emits radiant energy, mainly producing two ultraviolet radiations of 253.711111 and 1851111], wherein the 235·7 nm has the highest radiation efficiency, and the luminescence of the giant wall is excited by the phosphor. Adjust the formula of the phosphor to emit light of different color temperatures, such as reddish or bluish to meet the requirements of different displays. The function of the lamp cover 130 is to partially surround the lamp tube 12, and the reflection lamp tube 12 emits a light source to feed the light source into the linear Fresnel lens sheet 14 as much as possible. The linear Fresnel lens sheet 140 is actually one type, and the large-aperture aspherical lens has an optical effect equivalent to that of a general convex lens, but is thinner and lighter than a convex lens. The linear Fresnel lens sheet 14 includes a lens body 141. And the plurality of protrusions 142, the plurality of protrusions 142 are disposed on the side of the lens body 141 facing away from the tube 12〇, and have a triangular cross section. In design, the selection of the number of rings is crucial. Line I* Philippine & ear lens sheet 140 The more the number of rings, the smaller the spherical aberration and the thickness of the lens, the more uniform the spot is. The frame 110 is used to house the lamp 120 and the lamp cover 13 and to support the linear Philippine/ear lens 14G. Preventing light from being refracted from the frame n◦, absorbing the diffused light between the frame 110 and the linear lenticular lens sheet 14〇, the inner surface of the frame 110 forms a black plate. Referring to the third figure, the work is performed. When the lamp 120 emits light, part of the light is directly incident on the linear fluorite lens #14(), and the remaining light is reflected by the lamp cover 130 and is also incident on the linear Fresnel lens sheet 14 线性. Linear Fresnel lens sheet 14G Straighten the button to parallel light, When it is diffused, the uniform distribution 1264596 forms the desired surface light source in the light exiting region. The diffusing plate 150 is located on the side of the linear pheno-expansive lens sheet 14 for further stepping up the uniformity of the outgoing light. The backlight module can also have other improvements or replacements. For example, the inner=total reflection structure is used at the edge of the linear phenophone lens 丨4Q, because, for the linear Philippine lens, 丨姆 says, The closer to the edge, the more the light person hits the lens (four), the greater the reflection loss component. If the TIR structure is used, the incident angle can be close to the twist, which greatly reduces the reflection loss of the lens edge light, which is beneficial to make the lens appear more. The inner surface of the lampshade 130 may be coated with a high-reflection film layer. The lampshade 130 may be integrally formed with the frame 110. The protrusion 142 may also have a trapezoidal or circular arc shape in cross section. The present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only a preferred embodiment of the present invention, and the person who is in the skill of the case is given a case in the case of aiding the case. Equivalent modifications or changes made by the spirit shall be included in the following patent application. [Simplified description of the drawings] The first figure is a cross-sectional view of a prior art direct type backlight module. The second figure is a direct type backlight module of the present invention. The third figure is a schematic diagram of the optical path of the direct type backlight module of the present invention. [Main component symbol description] Backlight module 1 frame 110 lamp 120 lamp cover 130 linear Fresnel lens plate 140 diffusion plate 150 10 1264596 Frame inner surface 111 lens body 141 protrusion 142
1111