TWI289216B

TWI289216B - Backlight module and light guide plate thereof

Info

Publication number: TWI289216B
Application number: TW92128505A
Authority: TW
Inventors: Jhy-Chain Lin
Original assignee: Hon Hai Prec Ind Co Ltd
Priority date: 2003-10-15
Filing date: 2003-10-15
Publication date: 2007-11-01
Also published as: TW200513692A

Abstract

A light guide plate match with LED includes at least an incident surface for receiving incident light, a bottom surface for reflecting and diffusing the incident light, a light emitting surface for directing the light to emit, wherein, a plurality of grooves which are perpendicular with the incident surface are formed on the light emitting surface. The width between two grooves that near a LED source is smaller than that far from the LED source.

Description

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【發明所屬之技術領域】士發明係關於—種背光模組及其導光板，尤指一種具較南出光均勻度之背光模組及其導光板。【先前技術】液晶顯示器為一種非自發光顯示裝置，其顯示主要藉由控制外部光源所發出光束之通過或者不通過來實現，因此需要相應之背光模組或者前光模組，該背光或者前光模組可將外部光源所發出之光束導向顯示面板，實現顯示功能。 ^ #請參閱第一圖，是一種先前技術的背光模組丨，該背光模組1包括一點光源U、一反射板12、一導光板13、一擴散板14及一增亮片15。該導光板13大致？平板形，其包括一入光面131、一底面133及一出光面132。其中該點光源11相對於導光板13的入光面131設置，該反射板12、導光板13、擴散板14及增亮片15依次層疊放置。由點光源u 發出的光束，經導光板1 3、反射板1 2及擴散板1 4作用後導向該增亮片15，該增亮片15表面均勻分佈有複數平行之棱鏡結構151，該棱鏡結構151將該光束聚集並導向顯示面板 (圖未示）。請參閱第二圖，係二顆點光源11之出射光於導光板i 3 空間平面2 0 0之能量分佈示意圖。由於點光源11之出射光能量呈一圓錐分佈（請參？第三圖），故，該點光源11之出射光入射至一空間平面2 0 0時，該空間平面2 〇〇會存在出射光無法到達之區域2 6 1、2 6 2及2 6 3，該區域2 6 1、2 6 2及2 6 3[Technical Fields of the Invention] The invention relates to a backlight module and a light guide plate thereof, and more particularly to a backlight module having a uniformity of south light emission and a light guide plate thereof. [Prior Art] A liquid crystal display is a non-self-luminous display device, and its display is mainly realized by controlling the passage or non-passing of a light beam emitted by an external light source. Therefore, a corresponding backlight module or a front light module is required, and the backlight or front light is required. The module can guide the light beam emitted by the external light source to the display panel to realize the display function. ^ #Please refer to the first figure, which is a prior art backlight module. The backlight module 1 includes a point light source U, a reflection plate 12, a light guide plate 13, a diffusion plate 14, and a brightness enhancement sheet 15. The light guide plate 13 is substantially? The flat plate shape includes a light incident surface 131, a bottom surface 133 and a light exit surface 132. The spot light source 11 is disposed relative to the light incident surface 131 of the light guide plate 13, and the reflector 12, the light guide plate 13, the diffuser plate 14, and the brightness enhancement sheet 15 are sequentially stacked. The light beam emitted from the point light source u is guided to the brightness enhancing sheet 15 after being acted by the light guide plate 13, the reflecting plate 12 and the diffusing plate 14. The surface of the brightness enhancing sheet 15 is uniformly distributed with a plurality of parallel prism structures 151. The prism structure 151 The beam is concentrated and directed to a display panel (not shown). Please refer to the second figure, which is a schematic diagram of the energy distribution of the light emitted by the two point sources 11 on the spatial plane 200 of the light guide plate i 3 . Since the exiting light energy of the point source 11 has a conical distribution (refer to the third figure), when the exiting light of the point source 11 is incident on a spatial plane 2 0 0, the spatial plane 2 〇〇 will have an outgoing light. Unreachable areas 2 6 1 , 2 6 2 and 2 6 3, the area 2 6 1 , 2 6 2 and 2 6 3

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通常被稱為暗帶區。有 11入射至導光板1 3時，背光模組之出光均勻度鑑於此，該背光模組1中，、、，元* 該導光板13中會存在暗帶區，影響有鑑於此’提供一種無暗帶且具較高出光模組及導光板實為必需。【發明内容】光均勻度之背板本發明之目的在於提供一種具較高出光均勻度之導光本發明之另—目的在於提供一種具較高出光均背光模組。」』反心本發明所提供之配合點光源之導光板包括：至少一用於接收點光源入射光束之入光面，一用於散射、反射該入射光束之底面，一將底面散射、反射之光束導出之出光面，其中，該出光面之靠近入光面處具有複數垂直於該入光面之凹槽，靠近點光源處之凹槽之間間距大於遠離點光源處之凹槽之間間距。 ^ 本發明之背光模組包括：至少一點光源；一導光板，係用以接收來自該至少一點光源發出之光束並將其導出，該導光板具至少一入光面、一出光面及一底面，該至少一點光源相對該至少一入光面設置，該至少一入光面用以接收η亥至少一點光源所發出之光束。其中，該出光面之靠近入光面處具有複數垂直於該入光面之凹槽，靠近點光源處之凹槽之間間距大於遠離點光源處之凹槽之間間距。相較於先前技術，本發明背光模組之導光板出光面具Often referred to as the dark zone. When there is 11 incident on the light guide plate 13 , the light uniformity of the backlight module is in view of this, in the backlight module 1 , there is a dark band region in the light guide plate 13 , and the influence is provided It is necessary to have no dark band and a high light-emitting module and a light guide plate. SUMMARY OF THE INVENTION Backlight of Light Uniformity The object of the present invention is to provide a light guide having a higher light uniformity. Another object of the present invention is to provide a backlight module having a higher light output. The light guide plate of the light source with the point source provided by the present invention comprises: at least one light incident surface for receiving the incident light beam of the point light source, one for scattering and reflecting the bottom surface of the incident light beam, and one for scattering and reflecting the bottom surface. a light exiting light exiting surface, wherein the light exiting surface has a plurality of grooves perpendicular to the light incident surface near the light incident surface, and a spacing between the concave portions near the point light source is greater than a spacing between the concave portions away from the point light source . The backlight module of the present invention comprises: at least one light source; a light guide plate for receiving and guiding a light beam emitted from the at least one light source, the light guide plate having at least one light incident surface, a light exit surface and a bottom surface The at least one light source is disposed opposite to the at least one light incident surface, and the at least one light incident surface is configured to receive the light beam emitted by the light source at least one point. Wherein, the light-emitting surface has a plurality of grooves perpendicular to the light-incident surface near the light-incident surface, and the distance between the grooves near the point light source is larger than the distance between the grooves away from the point light source. Compared with the prior art, the light guide plate of the backlight module of the present invention is light-emitting mask

第7頁 1289216 —---^-------: 五、發明說明（3)、 ' 有複數與入光面垂直之凹槽，而且該凹槽與點光源之距離不同’ ^排伟方式亦不同，靠近點光源處之凹槽之間間距車父見i遂離點光源處之凹槽之間間距較窄，該種設計能使處於靠近點光源處之光束較遠離點光源處之光束更集中，由此該結構可削弱導光板之暗帶，使明暗差別進一步縮小’有效提高該出光面之出光均勻度，從而提高背光模組之出光均勻度。【實施方式】請參閱第四圖及第五圖，分別係本發明背光模組第一實施方式之立體圖及側視圖。該背光模組3包括點光源31 及一導光板33。其中，該導光板33係用以接收來自該點光源31發出之光束並將其導出，其具一入光面“I、一出光面332及一與入光面331垂直且與出光面3 32相對之底面 3 3 3 ’该底面3 3 3均勻設置有複數網點3 3 3 1。其中，該出光面332之罪近入光面處具有複數凹槽3321，該凹槽3321彼此之間距不等’靠近點光源3 1處（即亮帶區）之凹槽之間間距L比遠離點光源31處（即暗帶區）之凹槽之間間距η寬。該凹槽332 1之形狀可以如第四圖所示之形狀，其為R — Cut結構，該R-Cut結構指該凹槽的長度方向為弧線段，其截面係V型結構，但該凹槽3321之長度方向亦可為直線段，其截面亦可為u型結構’其中，最佳的實施方式為R—Cut結構且弧線段長3 in in ’ >朱度3 0 // πι ’寬度6 0 // m，弧線段對應半句為1 0 c m，弧線段於亮帶區域彼此之間距為1 2 〇 # m，於ρ 區域彼此之間距為70 //m。該凹槽3 32 1係利用R —Cut之:f 〈果光Page 7 1289216 —---^-------: V. Description of the invention (3), 'There are multiple grooves perpendicular to the entrance surface, and the distance between the groove and the point source is different' The method is different. The distance between the grooves near the point source is narrow. The distance between the grooves at the point source is narrow. This kind of design can make the beam near the point source farther away from the point source. The beam is more concentrated, so that the structure can weaken the dark band of the light guide plate, further narrowing the difference between light and dark, effectively increasing the uniformity of the light exiting the light emitting surface, thereby improving the uniformity of light output of the backlight module. [Embodiment] Please refer to the fourth and fifth figures, which are respectively a perspective view and a side view of a first embodiment of a backlight module of the present invention. The backlight module 3 includes a point light source 31 and a light guide plate 33. The light guide plate 33 is configured to receive the light beam emitted from the point light source 31 and derive it, and has a light incident surface “I, a light exit surface 332 and a light incident surface 331 perpendicular to the light incident surface 331 and the light exit surface 3 32 . The bottom surface of the light-emitting surface 332 is provided with a plurality of dots 3 3 3 1 . 'The spacing L between the grooves near the point source 3 1 (ie, the bright band) is wider than the distance η between the grooves away from the point source 31 (ie, the dark band). The shape of the groove 332 1 can be as The shape shown in the fourth figure is an R-Cut structure. The R-Cut structure means that the length direction of the groove is an arc segment, and the cross-section is a V-shaped structure, but the length of the groove 3321 can also be a straight line. The section may also be a u-shaped structure. Among them, the best embodiment is an R-Cut structure and the arc length is 3 in in ' > Zhu Du 3 0 // πι 'width 6 0 // m, arc segment The corresponding half sentence is 10 cm, the distance between the arc segments in the bright band region is 1 2 〇# m, and the distance between the ρ regions is 70 //m. 3321 system using R -Cut of: f <fruit light

第8頁 1289216 五、發明說明（4) =::間距玉反比之原理，即間距越寬亮度越弱，間距越乍受度越強，藉由明暗區域不同間距之設計，從而拉近明暗區域之輝度差別，達到抑制暗帶並有效提高背光模組3 之出光均勻度。明參閱第六圖’為本發明背光模組第二實施方式之立體圖。邊为光杈組4包括一導光板4 3及分別位於該導光板 43二側之點光源41。其中，該導光板43係用以接收來自該點光源41發出之光束並將其導出，其具二入光面431、一出光面432及與二入光面431垂直而與出光面432相對之底面4 3 3，該底面4 3 3均勻設置有複數網點（圖未示）。該點光源4 1相對該入光面4 3 1設置，該二入光面4 3 j用以接收該點光源41所發出之光束，該底面433將該光束散射、反射後導向出光面432，由出光面432將該光束導出。其中，該出光面432之靠近入光面處具有複數凹槽4321，該複數凹槽 4 3 2 1的長度方向可以為直線段亦可為弧線段，但其最佳實 =方式為弧線段（即R-Cut結構）且長為3m_m，深度為30 #〇!，寬度為60 //m，弧線段對應半徑為1 〇cin，於亮帶區域弧線段彼此之間間距為1 2 0 // m，於暗帶區域弧線段彼此之間間距為70 // m。相較先前技術之背光模組結構，本發明之背光模組可減小暗帶與亮帶之輝度差距，並有效提高背光模組之出光均勻度。該凹槽結構332 1、432 1之長度可依照導光板之大小及暗區的範圍擴大或者縮小線段之長度、寬度及深度，由於暗帶、亮帶與光源之遠近差距同樣也存在暗帶之間的輝度Page 8 1289216 V. Description of invention (4) =:: The principle of the inverse ratio of spacing jade, that is, the wider the spacing, the weaker the brightness, the stronger the spacing, the more the spacing between the light and dark areas, so that the light and dark areas are brought closer. The difference in luminance is such that the dark band is suppressed and the light uniformity of the backlight module 3 is effectively improved. Referring to the sixth figure, it is a perspective view of a second embodiment of the backlight module of the present invention. The edge group 4 includes a light guide plate 43 and point light sources 41 respectively located on two sides of the light guide plate 43. The light guide plate 43 is configured to receive and emit a light beam emitted from the point light source 41, and has a light incident surface 431, a light exit surface 432, and a light incident surface 431 opposite to the light exit surface 432. The bottom surface 4 3 3 is uniformly provided with a plurality of dots (not shown). The point light source 4 1 is disposed opposite to the light incident surface 43 1 , and the double light incident surface 43 3 is configured to receive the light beam emitted by the point light source 41 , and the bottom surface 433 scatters and reflects the light beam to the light exit surface 432 . The light beam is directed by the light exit surface 432. Wherein, the light-emitting surface 432 has a plurality of grooves 4321 near the light-incident surface, and the length direction of the plurality of grooves 4 3 2 1 may be a straight line segment or an arc segment, but the best real mode is an arc segment ( That is, R-Cut structure) and the length is 3m_m, the depth is 30 #〇!, the width is 60 //m, the corresponding radius of the arc segment is 1 〇cin, and the distance between the arc segments in the bright band area is 1 2 0 // m, the distance between the arc segments in the dark zone is 70 // m. Compared with the backlight module structure of the prior art, the backlight module of the present invention can reduce the luminance difference between the dark band and the bright band, and effectively improve the light uniformity of the backlight module. The length of the groove structure 332 1 , 432 1 can expand or reduce the length, width and depth of the line segment according to the size of the light guide plate and the range of the dark region, and the dark band is also present due to the difference between the dark band, the bright band and the light source. Brightness

1289216 __ _ 五、發明說明（5) 差別及亮帶之間之輝度差別，因此，在暗帶區域比亮帶區域線段之間間距小之基礎上’在暗帶區域之較暗區域中^ 段之間間距可適當變窄，在亮帶區域之較亮區域中線段之間間距可適當變寬，從而縮小較亮處與較暗處之輝度差別，進而提高背光模組之出光均勻度。本發明之導光板底面所設置之複數網點所採用之材料為高發散光物質，其形狀可為圓形、方形或菱形，其分佈方式亦可為沿遠離入光面逐漸增加其大小或密度。/同二可相對導光板之底面没置一反射板（圖未示），該反射板可將導光板洩漏之光束反射入導光板，提高導光板出光面之輝度。該反射板亦可為反射膜，該反射膜貼覆於導光板之底面。另，該導光板之底面亦可與入光面傾斜相交。背光模組之點光源數量可依照導光板之大小增加或減少點光源數量。另，本發明之實施方式中所採用之點光源係發光二極體（LED， Light Emitting Diode )。綜上所述，本發明符合發明專利要件，依利：請。惟上所述者僅為本發明之較佳出J 凡沾悉本案技，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。第10頁 1289216 圖式簡單說明第一圖係一種先前技術背光模組之立體分解圖。第二圖係第一圖所示背光模組之光路示意圖。第三圖係發光二極體光強度極座標分佈圖。第四圖係本發明背光模組第一實施方式之立體圖。第五圖係第四圖之側視圖。第六圖係本發明背光模組第二實施方式之立體圖。1289216 __ _ V. Description of invention (5) The difference in brightness between the difference and the bright band, therefore, in the dark area of the dark band area is smaller than the line between the bright band areas The spacing between the lines can be appropriately narrowed, and the spacing between the line segments in the brighter region of the bright band region can be appropriately widened, thereby reducing the difference in luminance between the brighter portion and the darker portion, thereby improving the uniformity of light emission of the backlight module. The material used for the plurality of dots disposed on the bottom surface of the light guide plate of the present invention is a high divergent material, which may be in the shape of a circle, a square or a diamond, and may be distributed in such a manner as to gradually increase its size or density along the light entrance surface. There is no reflector (not shown) on the bottom surface of the light guide plate. The reflector can reflect the light leaking from the light guide plate into the light guide plate to improve the brightness of the light exit surface of the light guide plate. The reflector may also be a reflective film that is attached to the bottom surface of the light guide. In addition, the bottom surface of the light guide plate may also obliquely intersect the light incident surface. The number of point sources of the backlight module can increase or decrease the number of point sources according to the size of the light guide plate. Further, the point light source used in the embodiment of the present invention is a light emitting diode (LED). In summary, the present invention meets the requirements of the invention patent, Yili: Please. The above description is only for the purpose of the present invention. Any equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. Page 10 1289216 BRIEF DESCRIPTION OF THE DRAWINGS The first figure is an exploded perspective view of a prior art backlight module. The second figure is a schematic diagram of the optical path of the backlight module shown in the first figure. The third figure is the polar coordinate distribution map of the light-emitting diode. The fourth figure is a perspective view of a first embodiment of the backlight module of the present invention. The fifth figure is a side view of the fourth figure. Figure 6 is a perspective view of a second embodiment of the backlight module of the present invention.

【主要元件符號說明】背光模組 3、4 入光面 331 、 431 出光面 332 ^ 432 底面 333 > 433 點光源 31、41 凹槽 3321 - 4321 網點 333 1[Main component symbol description] Backlight module 3, 4 Light-incident surface 331, 431 Light-emitting surface 332 ^ 432 Bottom surface 333 > 433 Point light source 31, 41 Groove 3321 - 4321 Dot 333 1

第11頁Page 11

Claims

1289216 六、申請專利範圍 1. 一種配合點光源之導光板，其包括：至少一入光面，係用於接收點光源發出之入射光束；一底面，係用於散射、反射該入射光束；一出光面，係將底面散射、反射之光束導出；其中，該出光面之靠近入光面處具有複數垂直於該入光面之凹槽，靠近點光源處之凹槽之間間距大於遠離點光源處之凹槽之間間距。 2. 如申請專利範圍第1項所述之導光板，其中該點光源為發光二極體。1289216 VI. Patent application scope 1. A light guide plate matched with a point light source, comprising: at least one light incident surface for receiving an incident light beam emitted by a point light source; and a bottom surface for scattering and reflecting the incident light beam; The light-emitting surface is obtained by deriving and reflecting the light beam on the bottom surface; wherein the light-emitting surface has a plurality of grooves perpendicular to the light-incident surface near the light-incident surface, and the spacing between the grooves near the point light source is greater than the distance from the point light source The spacing between the grooves. 2. The light guide plate of claim 1, wherein the point source is a light emitting diode.

3. 如申請專利範圍第1項所述之導光板，其中該靠近點光源處之凹槽之間間距係1 2 0 // m，遠離點光源處之凹槽之間間距係7 0 // m。 4. 如申請專利範圍第1項所述之導光板，該凹槽係R-Cut 結構。 5. 如申請專利範圍第4項所述之導光板，其中該R-Cut結構之狐線段長為3mm，深度為3 0 // m，寬度為6 0 // m，弧線段對應半徑為1 0 c m。3. The light guide plate of claim 1, wherein the spacing between the grooves near the point source is 1 2 0 // m, and the spacing between the grooves away from the point source is 7 0 // m. 4. The light guide plate of claim 1, wherein the groove is an R-Cut structure. 5. The light guide plate of claim 4, wherein the fox line segment of the R-Cut structure has a length of 3 mm, a depth of 3 0 // m, a width of 6 0 // m, and an arc segment corresponding to a radius of 1 0 cm.

6. 如申請專利範圍第1項所述之導光板，其中該底面分佈複數網點。 7. 如申請專利範圍第6項所述之導光板，其中該網點之形狀沿遠離入光面方向逐漸變大。 8. —種背光模組，其包括：至少一點光源；一導光板，係用以接收來自該至少一點光源發出之光6. The light guide plate of claim 1, wherein the bottom surface distributes a plurality of dots. 7. The light guide plate of claim 6, wherein the shape of the dot gradually becomes larger as it goes away from the light incident surface. 8. A backlight module, comprising: at least one light source; a light guide plate for receiving light from the at least one light source

第12頁 1289216 六、申請專利範圍束並將其導出，該導光板具至少一入光面、一出光面及一底面，該至少一點光源相對該至少一入光面設置，該.至少一入光面用以接收該至少一點光源所發出之光束；其中，該出光面之靠近入光面處具有複數垂直於該入光面之凹槽，靠近點光源處之凹槽之間間距大於遠離點光源處之凹槽之間間距。 9.如申請專利範圍第8項所述之背光模組，其中該點光源為發光二極體。 1 0.如申請專利範圍第8項所述之背光模組，其中該靠近點光源處之凹槽之間寬度係1 2 0 // m，遠離點光源處之凹槽之間寬度係70 。 1 1.如申請專利範圍第8項所述之背光模組，該凹槽係R-Cut結構。 1 2.如申請專利範圍第11項所述之背光模組，其中該R-Cu t結構之弧線段長為3mm，深度為3 0 // m，寬度為 6 0 // m，孤線段對應半徑為1 0 c m。 1 3.如申請專利範圍第8項所述之背光模組，其中該底面分佈複數網點。 1 4.如申請專利範圍第1 3項所述之背光模組，其中該網點之形狀沿遠離入光面方向逐漸變大。 1 5.如申請專利範圍第8項所述之背光模組，其進一步包括一反射板，該反射板鄰近導光板之底面設置。 1 6.如申請專利範圍第8項所述之背光模組，其進一步包Page 12 1289216 6. Applying for the patent range bundle and deriving it, the light guide plate has at least one light-incident surface, a light-emitting surface and a bottom surface, and the at least one light source is disposed opposite to the at least one light-incident surface, the at least one input The light surface is configured to receive the light beam emitted by the at least one light source; wherein the light-emitting surface has a plurality of grooves perpendicular to the light-incident surface near the light-incident surface, and the distance between the grooves near the point light source is greater than the distance away from the point The spacing between the grooves at the source. 9. The backlight module of claim 8, wherein the point light source is a light emitting diode. The backlight module of claim 8, wherein the width between the grooves near the point source is 1 2 0 // m, and the width between the grooves at the point source is 70. 1 1. The backlight module of claim 8, wherein the groove is an R-Cut structure. The backlight module of claim 11, wherein the arc segment of the R-Cu t structure has a length of 3 mm, a depth of 3 0 // m, a width of 60 0 // m, and a lone line segment corresponding to The radius is 10 cm. The backlight module of claim 8, wherein the bottom surface is distributed with a plurality of dots. The backlight module of claim 13, wherein the shape of the dot gradually becomes larger as it goes away from the light incident surface. The backlight module of claim 8, further comprising a reflecting plate disposed adjacent to a bottom surface of the light guiding plate. 1 6. The backlight module according to claim 8 of the patent application, further comprising

第13頁 1289216 六、申請專利範圍括一反射膜，該反射膜貼覆於導光板之底面。 1 7.如申請專利範圍第8項所述之背光模組，其中該底面垂直於入光面。 ΛPage 13 1289216 VI. Patent Application Scope A reflective film is attached to the bottom surface of the light guide plate. The backlight module of claim 8, wherein the bottom surface is perpendicular to the light incident surface. Λ

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