TWI768332B - Light guide film, backlight module and display device - Google Patents

A light guide film includes a main body and a light-absorbing structural layer. The main body incudes a light-emitting surface, a bottom surface and a light-incident surface. The bottom surface is opposite to the light-emitting surface. The light-incident surface is connected between the light-emitting surface and the bottom surface. The light-absorbing structural layer is disposed on the bottom surface. The light-absorbing structural layer includes a substrate, a plurality of microstructures and a plurality of light-absorbing particles. Each of the microstructures is protruded from a surface of the substrate. At least one group of the light-absorbing particles is distributed in each of the microstructures. The microstructures are arranged so that the content of light-absorbing particles of the light-absorbing structure layer gradually increases from the light-incident surface along a direction away from the light-incident surface.

導光膜、背光模組及顯示裝置 Light guide film, backlight module and display device

本發明是有關於一種導光膜、背光模組及顯示裝置，且特別是有關於一種可提升出光顏色均勻性的導光膜、背光模組及顯示裝置。 The present invention relates to a light guide film, a backlight module and a display device, and in particular, to a light guide film, a backlight module and a display device that can improve the color uniformity of light output.

隨著顯示裝置朝向輕薄化發展，背光模組中的導光板(Light Guiding Plate)逐漸被導光膜(Light Guiding Film)取代。 As the display device becomes thinner and lighter, the Light Guiding Plate in the backlight module is gradually replaced by the Light Guiding Film.

雖然使用導光膜有利於顯示裝置的輕薄化，然而，如何提升顯示裝置的出光顏色均勻性仍是相關業者所面臨的一大挑戰。以底面形成有角形長條結構(V-cut)的導光膜為例，當使用白光發光二極體(Light Emitting Diode，LED)作為光源，由於LED具有顏色隨角度變化(color over angle，COA)的特性，當LED的光線進入導光膜並碰到底部的V-cut時，大角度的黃光會先出光，而使背光模組靠近光源的一端偏黃、遠離光源的一端偏藍。再以底面形成有雷射網點的導光膜為例，基於導光膜所使用材質易吸收黃光，會使背光模組靠近光源的一端偏藍、遠離光源一端偏黃，而造成色差。 Although the use of the light guide film is beneficial to the lightness and thinness of the display device, how to improve the color uniformity of the light emitted from the display device is still a major challenge faced by the related industry. Taking a light guide film with a V-cut structure formed on the bottom surface as an example, when a white light emitting diode (Light Emitting Diode, LED) is used as the light source, since the LED has a color over angle (COA) ) characteristics, when the light of the LED enters the light guide film and hits the V-cut at the bottom, the yellow light with a large angle will emit light first, and the end of the backlight module close to the light source will turn yellow, and the end far from the light source will turn blue. Taking the light guide film with laser dots formed on the bottom surface as an example, the material used in the light guide film easily absorbs yellow light, which makes the end of the backlight module close to the light source bluish and the end away from the light source yellow, resulting in chromatic aberration.

因此，如何改良導光膜的結構及/或材質，以提升背光模組出光顏色的均勻性，遂成為相關業者努力的目標。 Therefore, how to improve the structure and/or material of the light guide film so as to improve the uniformity of the color of the light emitted by the backlight module has become the goal of the related industry.

本發明之目的在於提供一種導光膜及背光模組，以解決上述問題。 The purpose of the present invention is to provide a light guide film and a backlight module to solve the above problems.

依據本發明之一實施方式是提供一種導光膜，包含一本體以及一光吸收結構層。本體包含一出光面、一底面以及一入光面。底面與出光面相對。入光面連接於出光面及底面之間。光吸收結構層設置於底面，光吸收結構層包含一基層、複數個微結構以及複數個光吸收粒子。各微結構由基層之一表面往外突起。光吸收粒子至少有一群是分散於各微結構。微結構配置以使光吸收結構層之光吸收粒子的含量由入光面往遠離入光面的方向漸增。 According to an embodiment of the present invention, a light guide film is provided, which includes a body and a light absorbing structure layer. The body includes a light-emitting surface, a bottom surface and a light-incident surface. The bottom surface is opposite to the light-emitting surface. The light incident surface is connected between the light outgoing surface and the bottom surface. The light absorption structure layer is arranged on the bottom surface, and the light absorption structure layer includes a base layer, a plurality of microstructures and a plurality of light absorption particles. Each microstructure protrudes outward from a surface of the base layer. At least one group of light-absorbing particles is dispersed in each microstructure. The microstructure is configured so that the content of the light-absorbing particles in the light-absorbing structure layer gradually increases from the light-incident surface to the direction away from the light-incident surface.

依據前述的導光膜，各微結構的一突起高度由入光面往遠離入光面的方向漸增。 According to the aforementioned light guide film, the height of a protrusion of each microstructure increases gradually from the light incident surface to the direction away from the light incident surface.

依據前述的導光膜，基層的一厚度為t，微結構的一突起高度為h，其可滿足下列條件：0.1

h/t

1.7。 According to the aforementioned light guide film, a thickness of the base layer is t, and a height of a protrusion of the microstructure is h, which can satisfy the following conditions: 0.1

h/t

1.7.

依據前述的導光膜，各微結構可為一角形長條結構(V-cut)或一多面體結構(V-dot)。 According to the aforementioned light guide film, each microstructure can be a rectangular strip structure (V-cut) or a polyhedral structure (V-dot).

依據前述的導光膜，各光吸收粒子可為一藍光吸收粒子。 According to the aforementioned light guide film, each light absorbing particle can be a blue light absorbing particle.

依據前述的導光膜，微結構的分布密度可由入光面往遠離入光面的方向漸增。 According to the aforementioned light guide film, the distribution density of the microstructures can gradually increase from the light incident surface to the direction away from the light incident surface.

依據前述的導光膜，光吸收粒子還有一群是分散於基層，且基層的厚度由入光面往遠離入光面的方向漸增。 According to the aforementioned light guide film, a group of light absorbing particles are dispersed in the base layer, and the thickness of the base layer gradually increases from the light incident surface to the direction away from the light incident surface.

依據本發明之另一實施方式是提供一種背光模組，包含一光源以及前述的導光膜，其中光源對應入光面設置，光源的一光線由入光面進入導光膜後由出光面透出導光膜。 According to another embodiment of the present invention, a backlight module is provided, which includes a light source and the aforementioned light guide film, wherein the light source is disposed corresponding to the light incident surface, and a light of the light source enters the light guide film from the light incident surface and is transmitted through the light exit surface. out the light guide film.

依據前述的背光模組，其中光源可為一白光發光二極體。 According to the aforementioned backlight module, the light source may be a white light emitting diode.

依據本發明之又一實施方式是提供一種顯示裝置，包含前述的背光 模組以及一顯示面板，顯示面板設置在背光模組的上方。 According to another embodiment of the present invention, there is provided a display device including the aforementioned backlight The module and a display panel are arranged above the backlight module.

相較於先前技術，本發明的導光膜藉由微結構及光吸收粒子的配置關係，當應用於背光模組時，有利於提升背光模組出光顏色的均勻性，進而可提升顯示裝置的影像品質。 Compared with the prior art, the light guide film of the present invention is beneficial to improve the uniformity of the color of the light emitted by the backlight module when applied to the backlight module due to the configuration relationship between the microstructure and the light absorbing particles, thereby improving the performance of the display device. image quality.

1:顯示裝置 1: Display device

10:背光模組 10: Backlight module

20:顯示面板 20: Display panel

100,200,300,400:導光膜 100,200,300,400: Light guide film

110,210,310,410:本體 110, 210, 310, 410: Ontology

111,211,311,411:出光面 111, 211, 311, 411: light-emitting surface

112,212,312,412:底面 112, 212, 312, 412: Bottom

113,213,313,413:入光面 113, 213, 313, 413: light incident surface

120,220,320,420:光吸收結構層 120, 220, 320, 420: light absorbing structural layer

121,221,321,421:基層 121, 221, 321, 421: grassroots

121a,421a:表面 121a, 421a: Surface

122,222,322,422:微結構 122, 222, 322, 422: Microstructure

123,223,323,423:光吸收粒子 123, 223, 323, 423: light absorbing particles

500:光源模組 500: Light source module

510:光源 510: Light source

h:微結構的突起高度 h: the protrusion height of the microstructure

h1:第一突起高度 h1: height of the first protrusion

h2:第二突起高度 h2: the height of the second protrusion

t:基層的厚度 t: thickness of base layer

t1:第一厚度 t1: first thickness

t2:第二厚度 t2: second thickness

D1:第一方向 D1: first direction

E1:延伸方向 E1: extension direction

第1圖是依據本發明第一實施方式的導光膜的立體示意圖。 FIG. 1 is a schematic perspective view of a light guide film according to a first embodiment of the present invention.

第2圖是依據本發明第二實施方式的導光膜的立體示意圖。 FIG. 2 is a schematic perspective view of a light guide film according to a second embodiment of the present invention.

第3圖是依據本發明第三實施方式的導光膜的立體示意圖。 FIG. 3 is a schematic perspective view of a light guide film according to a third embodiment of the present invention.

第4圖是依據本發明第四實施方式的導光膜的立體示意圖。 FIG. 4 is a schematic perspective view of a light guide film according to a fourth embodiment of the present invention.

第5圖是依據本發明第五實施方式的背光模組的立體示意圖。 FIG. 5 is a schematic perspective view of a backlight module according to a fifth embodiment of the present invention.

第6圖是依據本發明第六實施方式的顯示裝置的立體示意圖。 FIG. 6 is a schematic perspective view of a display device according to a sixth embodiment of the present invention.

第7圖是導光膜之微結構突起高度與基層厚度於不同比值下的色差變化圖。 Figure 7 is a graph showing the change in color difference between the height of the microstructure protrusions of the light guide film and the thickness of the base layer at different ratios.

有關本發明之前述及其它技術內容、特點與功效，在以下配合參考圖式之較佳實施方式的詳細說明中，將可清楚地呈現。以下實施方式所提到的方向用語，例如：上、下、左、右、前、後、底、頂等，僅是參考附加圖式的方向。因此，使用的方向用語是用以說明，而非對本發明加以限制。此外，在下列各實施方式中，相同或相似的元件將採用相同或相似的標號。 The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, rear, bottom, top, etc., are only for referring to the directions of the attached drawings. Accordingly, the directional terms used are intended to illustrate, but not to limit the invention. Furthermore, in the following embodiments, the same or similar elements will be given the same or similar reference numerals.

本發明中，二元件實質上垂直是指二元件之間具有一夾角，該夾角為90度±10度，較佳為90度±5度，更佳為90度±3度。 In the present invention, the two elements are substantially vertical means that there is an included angle between the two elements, and the included angle is 90°±10°, preferably 90°±5°, more preferably 90°±3°.

本發明中，導光膜可用於背光模組，背光模組可用於提供液晶顯示 (Liquid Crystal Display,LCD)面板的光源，背光模組中的各元件包含一底面與一頂面，底面及頂面的定義是以LCD面板為參考基準，各元件以遠離LCD面板的一面為底面，以面向LCD面板的一面為頂面。此外，本發明中，一元件設置於另一元件的上方，是指設置於該另一元件的頂面或該另一元件的頂面的上方。 In the present invention, the light guide film can be used in a backlight module, and the backlight module can be used to provide a liquid crystal display The light source of the (Liquid Crystal Display, LCD) panel, each element in the backlight module includes a bottom surface and a top surface. The definition of the bottom surface and the top surface is based on the LCD panel as a reference, and each component takes the side away from the LCD panel as the bottom surface. , with the side facing the LCD panel as the top surface. In addition, in the present invention, that an element is disposed above another element means disposed on the top surface of the other element or above the top surface of the other element.

請參照第1圖，其是依據本發明第一實施方式的導光膜100的立體示意圖。導光膜100包含一本體110以及一光吸收結構層120。本體110包含一出光面111、一底面112以及一入光面113，底面112與出光面111相對，入光面113連接於出光面111及底面112之間。當導光膜100用於背光模組時，導光膜100用於將光源發出的光線，由入光面113導引至出光面111射出。 Please refer to FIG. 1 , which is a schematic perspective view of the light guide film 100 according to the first embodiment of the present invention. The light guide film 100 includes a body 110 and a light absorption structure layer 120 . The body 110 includes a light exit surface 111 , a bottom surface 112 and a light incident surface 113 . The bottom surface 112 is opposite to the light exit surface 111 , and the light entrance surface 113 is connected between the light exit surface 111 and the bottom surface 112 . When the light guide film 100 is used in a backlight module, the light guide film 100 is used to guide the light emitted by the light source from the light incident surface 113 to the light exit surface 111 to be emitted.

光吸收結構層120設置於底面112，光吸收結構層120包含一基層121、複數個微結構122以及複數個光吸收粒子123。各微結構122由基層121之一表面121a往外突起。複數個光吸收粒子123中至少有一群是分散於各微結構122，在第一實施方式中，複數個光吸收粒子123還有一群是分散於基層121，且複數個光吸收粒子123實質上均勻分散於基層121及微結構122，而使光吸收粒子123於基層121及微結構122中的濃度實質上固定。微結構122配置以使光吸收結構層120之光吸收粒子123的含量由入光面113往遠離入光面113的方向(即下文中的第一方向D1)漸增。本發明中所稱「配置」係廣義地說明複數個微結構122的排列方式，或微結構122本身的長度、厚度、形狀等參數。 The light absorption structure layer 120 is disposed on the bottom surface 112 , and the light absorption structure layer 120 includes a base layer 121 , a plurality of microstructures 122 and a plurality of light absorption particles 123 . Each microstructure 122 protrudes outward from a surface 121 a of the base layer 121 . At least one group of the plurality of light-absorbing particles 123 is dispersed in each microstructure 122. In the first embodiment, another group of the plurality of light-absorbing particles 123 is dispersed in the base layer 121, and the plurality of light-absorbing particles 123 are substantially uniform. The light-absorbing particles 123 are dispersed in the base layer 121 and the microstructure 122 , so that the concentration of the light absorbing particles 123 in the base layer 121 and the microstructure 122 is substantially fixed. The microstructures 122 are configured such that the content of the light absorbing particles 123 in the light absorbing structure layer 120 increases gradually from the light incident surface 113 to the direction away from the light incident surface 113 (ie, the first direction D1 hereinafter). The term "arrangement" in the present invention refers to the arrangement of a plurality of microstructures 122 in a broad sense, or parameters such as the length, thickness, and shape of the microstructures 122 themselves.

詳細來說，本體110的材質可為聚碳酸酯(Polycarbonate,PC)、光吸收結構層120的材質可為UV固化樹脂。各個微結構122為一角形長條結構(V-cut)，藉由設置微結構122，有利於改變光線的反射角度，而可提升導光膜100的出光效率。導光膜100定義一第一方向D1，第一方向D1由入光面113往遠離入光面113的方向延伸，各微結構122定義一延伸方向E1，延伸方向E1與第一方向D1實質上垂直，微結構122的分布密度由入光面113往遠離入光面113的方向漸增，即微 結構122的分布密度沿著第一方向D1漸增，藉此，使光吸收結構層120之光吸收粒子123的含量由入光面113往遠離入光面113的方向(即第一方向D1)漸增。各個微結構122的橫截面為一等腰三角形，然而，其僅為例示，可依實際需求將各個微結構122配置為其他形狀，例如，各個微結構122靠近入光面113的邊長可小於遠離入光面113的邊長，而使各個微結構122的橫截面為一非等腰三角形。 Specifically, the material of the body 110 may be polycarbonate (PC), and the material of the light absorbing structure layer 120 may be UV curable resin. Each of the microstructures 122 is an angular strip structure (V-cut). By arranging the microstructures 122 , the reflection angle of light can be changed, and the light extraction efficiency of the light guide film 100 can be improved. The light guide film 100 defines a first direction D1, the first direction D1 extends from the light incident surface 113 to a direction away from the light incident surface 113, each microstructure 122 defines an extending direction E1, and the extending direction E1 and the first direction D1 are substantially Vertically, the distribution density of the microstructures 122 increases gradually from the light incident surface 113 to the direction away from the light incident surface 113 , that is, the microstructure The distribution density of the structures 122 is gradually increased along the first direction D1, whereby the content of the light-absorbing particles 123 in the light-absorbing structure layer 120 is moved from the light incident surface 113 to the direction away from the light incident surface 113 (ie, the first direction D1). incrementally. The cross section of each microstructure 122 is an isosceles triangle, however, it is only an example, and each microstructure 122 can be configured into other shapes according to actual needs. For example, the length of each microstructure 122 close to the light incident surface 113 can be The cross section of each microstructure 122 is a non-isosceles triangle away from the side length of the light incident surface 113 .

基層121的一厚度為t，微結構122的一突起高度為h，其可滿足下列條件：0.1

h/t

1.7。藉此，有利於提升出光顏色的均勻性。較佳地，其可滿足下列條件：0.3

h/t

1.0。 A thickness of the base layer 121 is t, and a height of a protrusion of the microstructure 122 is h, which can satisfy the following conditions: 0.1

h/t

1.7. Thereby, it is beneficial to improve the uniformity of the emitted light color. Preferably, it can meet the following conditions: 0.3

h/t

1.0.

第一實施方式中，光吸收粒子123可為藍光吸收粒子，當導光膜100用於背光模組時，且光源為白光LED時，可解決LED因顏色隨角度變化(color over angle，COA)的特性所產生的色差問題。在其他實施方式中，當微結構122配置為網點形式時(圖未繪示)，光吸收粒子123可為黃光吸收粒子。換句話說，導光膜100可依據其所配置的微結構122型態以及出光顏色的偏差情形，選擇適合的光吸收粒子123。 In the first embodiment, the light absorbing particles 123 can be blue light absorbing particles. When the light guide film 100 is used in a backlight module and the light source is a white light LED, it can solve the problem of color over angle (COA) of the LED. The chromatic aberration problem caused by the characteristics. In other embodiments, when the microstructures 122 are configured in the form of dots (not shown), the light absorbing particles 123 can be yellow light absorbing particles. In other words, the light guide film 100 can select suitable light absorbing particles 123 according to the configuration of the microstructures 122 and the deviation of the light output color.

請參照第2圖，其是依據本發明第二實施方式的導光膜200的立體示意圖。導光膜200包含一本體210以及一光吸收結構層220。本體210包含一出光面211、一底面212以及一入光面213，底面212與出光面211相對，入光面213連接於出光面211及底面212之間。光吸收結構層220設置於底面212，光吸收結構層220包含一基層221、複數個微結構222以及複數個光吸收粒子223。各微結構222由基層221之一表面(未另標號)往外突起。複數個光吸收粒子223中至少有一群是分散於各微結構222，在第二實施方式中，複數個光吸收粒子223還有一群是分散於基層221，且複數個光吸收粒子223實質上均勻分散於基層221及微結構222，而使光吸收粒子223於基層221及微結構222中的濃度實質上固定。微結構222配置以使光吸收結構層220之光吸收粒子223的含量由入光面213往遠離入光 面213的方向(即第一方向D1)漸增。 Please refer to FIG. 2 , which is a schematic perspective view of a light guide film 200 according to a second embodiment of the present invention. The light guide film 200 includes a body 210 and a light absorption structure layer 220 . The body 210 includes a light exit surface 211 , a bottom surface 212 and a light entrance surface 213 . The bottom surface 212 is opposite to the light exit surface 211 , and the light entrance surface 213 is connected between the light exit surface 211 and the bottom surface 212 . The light absorption structure layer 220 is disposed on the bottom surface 212 , and the light absorption structure layer 220 includes a base layer 221 , a plurality of microstructures 222 and a plurality of light absorption particles 223 . Each of the microstructures 222 protrudes outward from a surface (not numbered otherwise) of the base layer 221 . At least one group of the plurality of light-absorbing particles 223 is dispersed in each microstructure 222. In the second embodiment, another group of the plurality of light-absorbing particles 223 is dispersed in the base layer 221, and the plurality of light-absorbing particles 223 are substantially uniform. The light-absorbing particles 223 are dispersed in the base layer 221 and the microstructure 222 , so that the concentration of the light-absorbing particles 223 in the base layer 221 and the microstructure 222 is substantially fixed. The microstructures 222 are configured so that the content of the light-absorbing particles 223 of the light-absorbing structure layer 220 is moved away from the light-incident surface 213 The direction of the face 213 (ie, the first direction D1 ) increases gradually.

詳細來說，相較於第一實施方式，第二實施方式的微結構222的分布密度沿著第一方向D1維持不變，然而，各微結構222的突起高度由入光面213往遠離入光面213的方向(即第一方向D1)漸增，更詳細來說，最靠近入光面213的微結構222具有一第一突起高度h1，最遠離入光面213的微結構222具有一第二突起高度h2，亦即第一實施方式中的突起高度h可為第一突起高度h1或第二突起高度h2，第二突起高度h2大於第一突起高度h1，藉此，使光吸收結構層220之光吸收粒子223的含量由入光面213往遠離入光面213的方向(即第一方向D1)漸增。 In detail, compared with the first embodiment, the distribution density of the microstructures 222 in the second embodiment remains unchanged along the first direction D1. However, the protruding height of each microstructure 222 moves from the light incident surface 213 away from the light incident surface 213. The direction of the light surface 213 (ie, the first direction D1 ) increases gradually. More specifically, the microstructure 222 closest to the light incident surface 213 has a first protrusion height h1, and the microstructure 222 farthest from the light incident surface 213 has a first protrusion height h1. The second protrusion height h2, that is, the protrusion height h in the first embodiment can be the first protrusion height h1 or the second protrusion height h2, and the second protrusion height h2 is greater than the first protrusion height h1, thereby making the light absorbing structure The content of the light absorbing particles 223 of the layer 220 increases gradually from the light incident surface 213 to the direction away from the light incident surface 213 (ie, the first direction D1 ).

此外，第二實施方式的微結構222是連續地設置於基層221上，可由微結構222的突起高度漸增且連續設置型態，使光吸收粒子223的含量是沿第一方向D1漸進地變化，如此使包含導光膜200的背光模組(圖未繪示)具有更平順的調光效果；第二實施方式的導光膜200的其他細節可參照第一實施方式的導光膜100，在此不另贅述。 In addition, the microstructures 222 of the second embodiment are continuously arranged on the base layer 221 , and the protrusion height of the microstructures 222 can be gradually increased and continuously arranged, so that the content of the light absorbing particles 223 is gradually changed along the first direction D1 , so that the backlight module (not shown) including the light guide film 200 has a smoother dimming effect; other details of the light guide film 200 of the second embodiment can refer to the light guide film 100 of the first embodiment. It will not be repeated here.

請參照第3圖，其是依據本發明第三實施方式的導光膜300的立體示意圖。導光膜300包含一本體310以及一光吸收結構層320。本體310包含一出光面311、一底面312以及一入光面313，底面312與出光面311相對，入光面313連接於出光面311及底面312之間。光吸收結構層320設置於底面312，光吸收結構層320包含一基層321、複數個微結構322以及複數個光吸收粒子323。各微結構322由基層321之一表面(未另標號)往外突起。複數個光吸收粒子323中至少有一群是分散於各微結構322，在第三實施方式中，複數個光吸收粒子323還有一群是分散於基層321，且複數個光吸收粒子323實質上均勻分散於基層321及微結構322，而使光吸收粒子323於基層321及微結構322中的濃度實質上固定。微結構322配置以使光吸收結構層320之光吸收粒子323的含量由入光面313往遠離入光面313的方向(即第一方向D1)漸增。 Please refer to FIG. 3 , which is a schematic perspective view of a light guide film 300 according to a third embodiment of the present invention. The light guide film 300 includes a body 310 and a light absorption structure layer 320 . The body 310 includes a light exit surface 311 , a bottom surface 312 and a light entrance surface 313 . The bottom surface 312 is opposite to the light exit surface 311 , and the light entrance surface 313 is connected between the light exit surface 311 and the bottom surface 312 . The light absorption structure layer 320 is disposed on the bottom surface 312 , and the light absorption structure layer 320 includes a base layer 321 , a plurality of microstructures 322 and a plurality of light absorption particles 323 . Each microstructure 322 protrudes outward from a surface (not numbered otherwise) of the base layer 321 . At least one group of the plurality of light-absorbing particles 323 is dispersed in each microstructure 322. In the third embodiment, another group of the plurality of light-absorbing particles 323 is dispersed in the base layer 321, and the plurality of light-absorbing particles 323 are substantially uniform. The light-absorbing particles 323 are dispersed in the base layer 321 and the microstructure 322 , so that the concentration of the light absorbing particles 323 in the base layer 321 and the microstructure 322 is substantially fixed. The microstructure 322 is configured such that the content of the light absorbing particles 323 in the light absorbing structure layer 320 increases gradually from the light incident surface 313 to the direction away from the light incident surface 313 (ie, the first direction D1 ).

詳細來說，相較於第一、第二實施方式，第三實施方式的微結構322的分布密度及突起高度h沿著第一方向D1維持不變，然而，基層321的厚度由入光面313往遠離入光面313的方向(即第一方向D1)漸增，更詳細來說，基層321於最靠近入光面313的一側具有一第一厚度t1，基層321於最遠離入光面313的一側具有一第二厚度t2，亦即第一實施方式中的厚度t可為第一厚度t1或第二厚度t2，第二厚度t2大於第一厚度t1，藉此，使光吸收結構層320之光吸收粒子323的含量由入光面313往遠離入光面313的方向(即第一方向D1)漸增。如此，亦可達到調整出光顏色的均勻效果。 In detail, compared with the first and second embodiments, the distribution density and protrusion height h of the microstructures 322 in the third embodiment remain unchanged along the first direction D1. However, the thickness of the base layer 321 is determined by the light incident surface. 313 gradually increases in the direction away from the light incident surface 313 (ie, the first direction D1). More specifically, the base layer 321 has a first thickness t1 on the side closest to the light incident surface 313, and the base layer 321 is farthest from the light incident surface 313. One side of the surface 313 has a second thickness t2, that is, the thickness t in the first embodiment can be the first thickness t1 or the second thickness t2, and the second thickness t2 is greater than the first thickness t1, thereby allowing light to be absorbed The content of the light absorbing particles 323 of the structure layer 320 increases gradually from the light incident surface 313 to the direction away from the light incident surface 313 (ie, the first direction D1 ). In this way, the uniform effect of adjusting the color of the emitted light can also be achieved.

第三實施方式的導光膜300的其他細節可參照第一實施方式的導光膜100，在此不另贅述。 For other details of the light guide film 300 of the third embodiment, reference may be made to the light guide film 100 of the first embodiment, which will not be repeated here.

請參照第4圖，其是依據本發明第四實施方式的導光膜400的立體示意圖。導光膜400包含一本體410以及一光吸收結構層420。本體410包含一出光面411、一底面412以及一入光面413，底面412與出光面411相對，入光面413連接於出光面411及底面412之間。光吸收結構層420設置於底面412，光吸收結構層420包含一基層421、複數個微結構422以及複數個光吸收粒子423。各微結構422由基層421之一表面421a往外突起。複數個光吸收粒子423中至少有一群是分散於各微結構422，在第四實施方式中，複數個光吸收粒子423還有一群是分散於基層421，且複數個光吸收粒子423實質上均勻分散於基層421及微結構422，而使光吸收粒子423於基層421及微結構422中的濃度實質上固定。微結構422配置以使光吸收結構層420之光吸收粒子423的含量由入光面413往遠離入光面413的方向(即第一方向D1)漸增。 Please refer to FIG. 4 , which is a schematic perspective view of a light guide film 400 according to a fourth embodiment of the present invention. The light guide film 400 includes a body 410 and a light absorption structure layer 420 . The body 410 includes a light exit surface 411 , a bottom surface 412 and a light entrance surface 413 . The bottom surface 412 is opposite to the light exit surface 411 , and the light entrance surface 413 is connected between the light exit surface 411 and the bottom surface 412 . The light absorption structure layer 420 is disposed on the bottom surface 412 , and the light absorption structure layer 420 includes a base layer 421 , a plurality of microstructures 422 and a plurality of light absorption particles 423 . Each microstructure 422 protrudes outward from a surface 421 a of the base layer 421 . At least one group of the plurality of light-absorbing particles 423 is dispersed in each microstructure 422. In the fourth embodiment, another group of the plurality of light-absorbing particles 423 is dispersed in the base layer 421, and the plurality of light-absorbing particles 423 are substantially uniform. The light-absorbing particles 423 are dispersed in the base layer 421 and the microstructure 422 , so that the concentration of the light absorbing particles 423 in the base layer 421 and the microstructure 422 is substantially fixed. The microstructure 422 is configured such that the content of the light absorbing particles 423 of the light absorbing structure layer 420 increases gradually from the light incident surface 413 to the direction away from the light incident surface 413 (ie, the first direction D1 ).

在第四實施方式中，各個微結構422為一多面體結構(V-dot)，在此，以各個微結構422為六面體結構為例示，然而，本發明不以此為限，例如，多面體結構亦可為四面體結構或五面體結構。微結構422的分布密度由入光面413往 遠離入光面413的方向(即第一方向D1)漸增。藉此，使光吸收結構層420之光吸收粒子423的含量由入光面413往遠離入光面413的方向(即第一方向D1)漸增。與第一實施方式相較，多面體結構具有較佳的光線指向性，特別是能夠達到正面出光的功效。 In the fourth embodiment, each microstructure 422 is a polyhedral structure (V-dot). Here, each microstructure 422 is a hexahedral structure as an example, however, the present invention is not limited to this, for example, a polyhedron The structure may also be a tetrahedral structure or a pentahedral structure. The distribution density of the microstructures 422 is from the light incident surface 413 to the The direction away from the light incident surface 413 (ie, the first direction D1 ) increases gradually. Thereby, the content of the light absorbing particles 423 in the light absorbing structure layer 420 is gradually increased from the light incident surface 413 to the direction away from the light incident surface 413 (ie, the first direction D1 ). Compared with the first embodiment, the polyhedral structure has better light directivity, especially the effect of emitting light from the front.

第四實施方式的導光膜400的其他細節可參照第一實施方式的導光膜100，在此不另贅述。 For other details of the light guide film 400 of the fourth embodiment, reference may be made to the light guide film 100 of the first embodiment, which will not be repeated here.

請參照第5圖，其是依據本發明第五實施方式的背光模組10的立體示意圖。背光模組10包含一光源模組500以及導光膜400，光源模組500包含至少一光源510，光源510對應入光面413設置，光源510的一光線(圖未繪示)由入光面413進入導光膜400後由出光面411透出導光膜400，藉此，有利於提升背光模組10出光顏色的均勻性。詳細來說，光源模組500可為白光LED燈條，光源510可為白光LED。此外，可將背光模組10中的導光膜400更換為其他依據本發明的導光膜，例如第一實施方式至第三實施方式的導光膜100、200、300。 Please refer to FIG. 5 , which is a perspective view of a backlight module 10 according to a fifth embodiment of the present invention. The backlight module 10 includes a light source module 500 and a light guide film 400. The light source module 500 includes at least one light source 510. The light source 510 is disposed corresponding to the light incident surface 413, and a light (not shown) of the light source 510 is emitted from the light incident surface. After entering the light guide film 400 , the light 413 penetrates out of the light guide film 400 through the light emitting surface 411 , which is beneficial to improve the uniformity of the color of the light emitted by the backlight module 10 . Specifically, the light source module 500 can be a white LED light bar, and the light source 510 can be a white LED. In addition, the light guide film 400 in the backlight module 10 can be replaced with other light guide films according to the present invention, such as the light guide films 100 , 200 and 300 of the first embodiment to the third embodiment.

請參照第6圖，其是依據本發明第六實施方式的顯示裝置1的立體示意圖。顯示裝置1包含背光模組10以及顯示面板20，顯示面板20設置於背光模組10的上方。背光模組10用於提供顯示面板20光線，顯示面板20可為LCD面板，關於背光模組10的細節請參照上文，在此不另贅述。 Please refer to FIG. 6 , which is a schematic perspective view of a display device 1 according to a sixth embodiment of the present invention. The display device 1 includes a backlight module 10 and a display panel 20 , and the display panel 20 is disposed above the backlight module 10 . The backlight module 10 is used to provide light to the display panel 20 , and the display panel 20 may be an LCD panel. For details of the backlight module 10 , please refer to the above, and will not be repeated here.

請參照第7圖，其是導光膜之微結構突起高度與基層厚度於不同比值下的色差變化圖，其中橫坐標是導光膜的量測位置沿著第一方向D1佔導光膜全長的比例，縱座標是U'V'色座標的V'數值。詳細來說，第7圖的導光膜是採用第一實施方式之導光膜100的結構配置，即微結構為V-cut，且微結構的分布密度由入光面往遠離入光面的方向漸增，並將微結構的突起高度h及基層的厚度t配置為不同的比值，分別為h/t=0.1、0.3、0.5、1.0、1.7、3.5，量測具有不同h/t比值的導光膜，其沿著第一方向D1之U'V'色座標的V'數值；另以比較例進行試驗，比 較例是採用第一實施方式之導光膜100的結構配置，但未於光吸收結構層添加光吸收粒子，比較例h/t=3.5。由第7圖可知，在無添加光吸收粒子時，導光膜中遠離入光面處相較於接近入光面處呈現偏藍的色差；而本發明第一實施方式所揭露具有光吸收粒子的導光膜，其中，當h/t落在0.1~1.7的範圍時，其V'數值沿著第一方向D1的變化量皆落在±0.005內，其V'數值差異不大，顯示該導光膜遠離入光面處偏藍的色差得以調整，當h/t落在0.3~1.0的範圍時，其V'數值沿著第一方向D1的變化量皆落在±0.002內，可大幅改善色差問題。由第7圖可知，當基層的厚度為t，微結構的突起高度為h，滿足下列條件：0.1

h/t

1.7時，有利於提升出光顏色的均勻性。其中，當h/t比值小於0.1時，雖然能夠達成些微的調整出光顏色的效果，但不夠明顯；而當h/t比值大於1.7時，色差調整的效果恐怕會有偏黃色差的問題。 Please refer to FIG. 7, which is a graph of the color difference variation between the height of the microstructure protrusions of the light guide film and the thickness of the base layer at different ratios, wherein the abscissa is the measurement position of the light guide film along the first direction D1 occupying the entire length of the light guide film The ratio of , the ordinate is the V' value of the U'V' color coordinate. In detail, the light guide film of FIG. 7 adopts the structure configuration of the light guide film 100 of the first embodiment, that is, the microstructure is V-cut, and the distribution density of the microstructure is from the light incident surface to the light incident surface away from the light incident surface. The direction increases gradually, and the protrusion height h of the microstructure and the thickness t of the base layer are configured to different ratios, respectively h/t=0.1, 0.3, 0.5, 1.0, 1.7, 3.5. The light guide film, the V' value of the U'V' color coordinate along the first direction D1; the test is also carried out with a comparative example. Light absorbing particles are added to the light absorbing structure layer, and the comparative example is h/t=3.5. It can be seen from FIG. 7 that when no light absorbing particles are added, the light guide film has a bluish color difference at a place far from the light incident surface compared with a place close to the light incident surface. The light guide film of , wherein, when h/t falls in the range of 0.1~1.7, the variation of its V' value along the first direction D1 all falls within ±0.005, and its V' value has little difference, showing that the The bluish chromatic aberration of the light guide film away from the light incident surface can be adjusted. When h/t falls within the range of 0.3~1.0, the variation of its V' value along the first direction D1 falls within ±0.002, which can greatly reduce the Improve chromatic aberration problem. It can be seen from Figure 7 that when the thickness of the base layer is t, the height of the protrusion of the microstructure is h, and the following conditions are met: 0.1

h/t

1.7, it is beneficial to improve the uniformity of light color. Among them, when the h/t ratio is less than 0.1, although a slight effect of adjusting the color of the light can be achieved, it is not obvious enough; and when the h/t ratio is greater than 1.7, the effect of chromatic aberration adjustment may have a problem of yellowing.

相較於先前技術，本發明的導光膜藉由微結構及光吸收粒子的配置關係，當應用於背光模組時，有利於提升背光模組出光顏色的均勻性，進而可提升顯示裝置的影像品質。 Compared with the prior art, the light guide film of the present invention is beneficial to improve the uniformity of the color of the light emitted by the backlight module when applied to the backlight module due to the configuration relationship between the microstructure and the light absorbing particles, thereby improving the performance of the display device. image quality.

以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

100:導光膜 100: light guide film

110:本體 110: Ontology

111:出光面 111: light-emitting surface

112:底面 112: Bottom surface

113:入光面 113: light incident surface

120:光吸收結構層 120: light absorption structure layer

121:基層 121: Grassroots

121a:表面 121a: Surface

122:微結構 122: Microstructure

123:光吸收粒子 123: Light Absorbing Particles

h:微結構的突起高度 h: the protrusion height of the microstructure

t:基層的厚度 t: thickness of base layer

D1:第一方向 D1: first direction

E1:延伸方向 E1: extension direction

一種導光膜，包含：一本體，包含：一出光面；一底面，與該出光面相對；以及一入光面，連接於該出光面及該底面之間；以及一光吸收結構層，設置於該底面，該光吸收結構層包含：一基層；複數個微結構，各該微結構由該基層之一表面往外突起，各該微結構各自具有一突起高度；以及複數個光吸收粒子，該些光吸收粒子至少有一群是分散於各該微結構，該些光吸收粒子還有一群是分散於該基層；其中該些微結構配置以使該光吸收結構層之光吸收粒子的含量由該入光面往遠離該入光面的方向漸增；其中該基層的一厚度為t，各該微結構各自具有的該突起高度為h，其滿足下列條件：0.1

h/t

1.7。 A light guide film, comprising: a main body, including: a light emitting surface; a bottom surface, opposite to the light emitting surface; and a light incident surface, connected between the light emitting surface and the bottom surface; and a light absorbing structure layer, provided On the bottom surface, the light-absorbing structure layer comprises: a base layer; a plurality of microstructures, each of which protrudes outward from a surface of the base layer, each of the microstructures has a protruding height; and a plurality of light-absorbing particles, the At least one group of the light-absorbing particles is dispersed in each of the microstructures, and another group of the light-absorbing particles is dispersed in the base layer; wherein the microstructures are configured so that the content of the light-absorbing particles in the light-absorbing structure layer is determined by the input. The light surface gradually increases in the direction away from the light incident surface; wherein a thickness of the base layer is t, and the height of the protrusions each of the microstructures has is h, which satisfies the following conditions: 0.1

h/t

1.7. 如請求項1所述的導光膜，其中該些微結構的該些突起高度由該入光面往遠離該入光面的方向漸增。 The light guide film according to claim 1, wherein the heights of the protrusions of the microstructures gradually increase from the light incident surface to a direction away from the light incident surface. 如請求項1所述的導光膜，其中各該微結構為一角形長條結構(V-cut)或一多面體結構(V-dot)。 The light guide film according to claim 1, wherein each of the microstructures is a rectangular strip structure (V-cut) or a polyhedral structure (V-dot). 如請求項3所述的導光膜，其中各該光吸收粒子為一藍光吸收粒子。 The light guide film according to claim 3, wherein each of the light absorbing particles is a blue light absorbing particle. 如請求項1所述的導光膜，其中該些微結構的分布密度由該入光面往遠離該入光面的方向漸增。 The light guide film of claim 1, wherein the distribution density of the microstructures increases gradually from the light incident surface to a direction away from the light incident surface. 如請求項1所述的導光膜，其中該基層的該厚度由該入光面往遠離該入光面的方向漸增。 The light guide film of claim 1, wherein the thickness of the base layer gradually increases from the light incident surface to a direction away from the light incident surface. 一種背光模組，包含：一光源；以及一如請求項1至6任一項所述的導光膜；其中該光源對應該入光面設置，該光源的一光線由該入光面進入該導光膜後由該出光面透出該導光膜。 A backlight module, comprising: a light source; and a light guide film according to any one of claims 1 to 6; wherein the light source is disposed corresponding to the light incident surface, and a light of the light source enters the light incident surface from the light incident surface After the light guide film, the light guide film is transmitted through the light emitting surface. 如請求項7所述的背光模組，其中該光源為一白光發光二極體。 The backlight module of claim 7, wherein the light source is a white light emitting diode. 一種顯示裝置，包含：一如請求項7所述的背光模組；以及一顯示面板，設置在該背光模組的上方。 A display device, comprising: a backlight module according to claim 7; and a display panel disposed above the backlight module. 如請求項9所述的顯示裝置，其中該光源為一白光發光二極體。 The display device according to claim 9, wherein the light source is a white light emitting diode.