TWI575254B - Display apparatus and back light module thereof - Google Patents
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Description
本發明是有關於一種顯示裝置及其背光模組(back light module)，且特別是有關於一種可切換式二維/三維(switchable 2D/3D)影像的顯示裝置及其背光模組。 The present invention relates to a display device and a backlight module thereof, and more particularly to a switchable 2D/3D image display device and a backlight module thereof.
一般來說，三維顯示器(three dimensional displays)可區分為外掛眼鏡式(stereoscopic type)，與裸眼式(autostereoscopic type)。其中，裸眼式顯示器在內部設置特殊的光學元件，如視差光柵(parallax barrier)或柱狀稜鏡(lenticular lens)，使得使用者的左、右眼可以分別觀察顯示裝置上具有視差的影像，感知形成一立體影像。為了同時滿足使用者需要觀看二維(two dimension，2D)影像，可切換式二維/三維顯示裝置被提出，讓使用者可在三維影像和二維影像兩種顯示模式中進行轉換。 In general, three dimensional displays can be distinguished as a stereoscopic type and an autostereoscopic type. Among them, the naked-eye display is provided with a special optical component, such as a parallax barrier or a lenticular lens, so that the left and right eyes of the user can separately observe the image with parallax on the display device, and perceive the image. Form a stereo image. In order to simultaneously satisfy the user's need to view two-dimensional (2D) images, a switchable two-dimensional/three-dimensional display device is proposed, which allows the user to convert between two-dimensional image and two-dimensional image display modes.
典型可切換式二維/三維三維顯示裝置，包括一個三 維發光模組以及一個二維發光模組。當顯示三維影像時，可將二維發光模組關閉而僅由三維發光模組發光。使三維發光模組所發出的光線，穿過影像顯示面板，例如液晶顯示面板(Liquid Crystal Display，LCD)，產生具有視差的影像而分別被使用者的左、右眼所接收，讓使用者感知三維影像。當顯示二維影像時，則可將二維發光模組開啟，三維發光模組可關閉或微開啟輔助補充光線，光線，穿過三維發光模組以及影像顯示面板後，對使用者提供二維影像。 Typical switchable 2D/3D 3D display device, including a three Dimensional lighting module and a two-dimensional lighting module. When the three-dimensional image is displayed, the two-dimensional light-emitting module can be turned off and only the three-dimensional light-emitting module can emit light. The light emitted by the three-dimensional light-emitting module is passed through an image display panel, such as a liquid crystal display (LCD), to generate an image with parallax and is respectively received by the left and right eyes of the user, so that the user perceives 3D imagery. When the two-dimensional image is displayed, the two-dimensional light-emitting module can be turned on, and the three-dimensional light-emitting module can be turned off or slightly turned on to supplement the light, and the light passes through the three-dimensional light-emitting module and the image display panel to provide two-dimensionality to the user. image.
然而在顯示三維影像時，由於一部分三維發光模組 所發出的光線並未直接穿過影像顯示面板，而是先射向二維發光模組，經二維發光模組反射之後，進入使用者的眼睛，產生非預期之亮暗交錯排列的疊紋(Moire)及與顯示面板的影像產生串擾(crosstalk)，降低自動立體影像顯示裝置的顯示品質。 However, when displaying 3D images, due to a part of the 3D lighting module The emitted light does not directly pass through the image display panel, but is first directed to the two-dimensional light-emitting module, and after being reflected by the two-dimensional light-emitting module, enters the user's eyes, and generates an unexpectedly bright and dark staggered pattern. (Moire) and crosstalk with the image of the display panel to reduce the display quality of the autostereoscopic image display device.
因此，仍有需要提供一種先進的顯示裝置及其背光 模組，以改善習知技術所面臨的問題。 Therefore, there is still a need to provide an advanced display device and its backlight Modules to improve the problems faced by conventional technologies.
本發明的一個實施例是有關於一種背光模組，此背光模組包括：第一發光模組(light emitting module)、第二發光模組以及光衰減元件(attenuator)。其中，第一發光模組具有一出光面；第二發光模組位於出光面的相反一側；光衰減元件包括具有第一光吸收軸的第一偏光板，且第一偏光板位於第一發光模組與 第二發光模組之間。 One embodiment of the present invention relates to a backlight module including: a first light emitting module, a second light emitting module, and a light attenuator. The first light emitting module has a light emitting surface; the second light emitting module is located on the opposite side of the light emitting surface; the light attenuating element includes a first polarizing plate having a first light absorption axis, and the first polarizing plate is located at the first light emitting Module and Between the second lighting modules.
本發明的另一個實施例是有關於一種顯示裝置，此 顯示裝置包括顯示面板以及背光模組。其中，顯示面板，包括彼此相對的下偏光板和上偏光板，且分別具有相互正交的第一偏光軸和第二偏光軸。背光模組包括第一發光模組、第二發光模組以及光衰減元件。其中，第一發光模組具有面對下偏光板的一出光面；第二發光模組位於出光面的相反一側；光衰減元件位於第一發光模組與第二發光模組之間，且包括具有第一光吸收軸的一第一偏光板。其中第一光吸收軸實質與下偏光板的第一偏光軸平行。 Another embodiment of the present invention is directed to a display device, The display device includes a display panel and a backlight module. Wherein, the display panel includes a lower polarizing plate and an upper polarizing plate opposite to each other, and has a first polarizing axis and a second polarizing axis orthogonal to each other, respectively. The backlight module includes a first lighting module, a second lighting module, and a light attenuating component. The first light emitting module has a light emitting surface facing the lower polarizing plate; the second light emitting module is located on the opposite side of the light emitting surface; the light attenuating component is located between the first light emitting module and the second light emitting module, and A first polarizer having a first light absorption axis is included. Wherein the first light absorption axis is substantially parallel to the first polarization axis of the lower polarizer.
本發明的又一個實施例是有關於一種背光模組，此 背光模組包括第一發光模組、第二發光模組、反射片以及光衰減元件。其中，第一發光模組具有一出光面；反射片位於出光面的相反一側；第二發光模組位於第一發光模組與反射片之間；光衰減元件包括一偏光板以及一相位差板。偏光板具有一光吸收軸，且位於第二發光模組與反射片之間；相位差板位於偏光板與反射片之間。 Yet another embodiment of the present invention is directed to a backlight module, The backlight module includes a first light emitting module, a second light emitting module, a reflective sheet, and a light attenuating element. The first light emitting module has a light emitting surface; the reflective film is located on the opposite side of the light emitting surface; the second light emitting module is located between the first light emitting module and the reflective sheet; the light attenuating element comprises a polarizing plate and a phase difference board. The polarizing plate has a light absorption axis and is located between the second light emitting module and the reflective sheet; the phase difference plate is located between the polarizing plate and the reflective sheet.
本發明的再一個實施例是有關於一種顯示裝置，此 顯示裝置包括顯示面板以及背光模組。其中，背光模組包括第一發光模組、反射片、第二發光模組以及光衰減元件。第一發光模組具有面對顯示面板的一出光面；反射片位於出光面的相反一側；第二發光模組位於第一發光模組與反射片之間；光衰減元件 包括偏光板以及相位差板。偏光板具有一光吸收軸，且位於第二發光模組與反射片之間。相位差板位於偏光板與反射片之間。 Still another embodiment of the present invention is directed to a display device, The display device includes a display panel and a backlight module. The backlight module includes a first light emitting module, a reflective sheet, a second light emitting module, and a light attenuating component. The first light emitting module has a light emitting surface facing the display panel; the reflective sheet is located on the opposite side of the light emitting surface; the second light emitting module is located between the first light emitting module and the reflective sheet; and the light attenuating component Includes polarizing plate and phase difference plate. The polarizing plate has a light absorption axis and is located between the second light emitting module and the reflective sheet. The phase difference plate is located between the polarizing plate and the reflective sheet.
根據上述，本發明的實施例是提供一種二維/三維可 切換顯示模式的顯示裝置及其背光模組。在本發明的一些實施例中，此一顯示裝置的背光模組至少包括彼此平行排列的第一發光模組和第二發光模組，可藉由第一發光模組和第二發光模組的切換使用來提供至少二維及三維的二種顯示模式。其中，第一發光模組具有一出光面，並在出光面的相對一側配置一個包含至少一個吸收式偏光版的光衰減元件，來防止由第一發光模組所發出並射向第二發光模組的一部分光線，受到第二發光模組的反射，而產生非預期之亮暗交錯排列的疊紋，進而防止該部分光線與由第一發光模組所發出且直接穿過出光面的光線產生串擾現象。可以改善顯示裝置採用第一發光模組時的顯示品質，而不會影響切換成另一顯示模式時的顯示品質。 According to the above, an embodiment of the present invention provides a two-dimensional/three-dimensional Switching the display device of the display mode and its backlight module. In some embodiments of the present invention, the backlight module of the display device includes at least a first light emitting module and a second light emitting module arranged in parallel with each other, and the first light emitting module and the second light emitting module are Switch to use to provide at least two display modes of 2D and 3D. The first light-emitting module has a light-emitting surface, and a light-attenuating element including at least one absorption-type polarizing plate is disposed on the opposite side of the light-emitting surface to prevent the first light-emitting module from being emitted and directed to the second light-emitting layer. A part of the light of the module is reflected by the second light-emitting module, and an undesired light-dark staggered pattern is generated, thereby preventing the part of the light from being emitted by the first light-emitting module and directly passing through the light-emitting surface. Crosstalk is generated. The display quality when the display device adopts the first light-emitting module can be improved without affecting the display quality when switching to another display mode.
50‧‧‧顯示裝置 50‧‧‧ display device
51‧‧‧顯示面板 51‧‧‧ display panel
51a‧‧‧液晶層 51a‧‧‧Liquid layer
51b‧‧‧下偏光板 51b‧‧‧Lower polarizer
51c‧‧‧上偏光板 51c‧‧‧Upper polarizer
60‧‧‧顯示裝置 60‧‧‧ display device
100‧‧‧背光模組 100‧‧‧Backlight module
101‧‧‧第一發光模組 101‧‧‧First lighting module
101a‧‧‧出光面 101a‧‧‧Glossy
102‧‧‧第二發光模組 102‧‧‧Second lighting module
103‧‧‧光衰減元件 103‧‧‧Light attenuation components
104‧‧‧導光板 104‧‧‧Light guide plate
104a‧‧‧入光面 104a‧‧‧Glossy
104b‧‧‧入光面 104b‧‧‧Glossy
104c‧‧‧第一側面 104c‧‧‧ first side
104d‧‧‧第二側面 104d‧‧‧ second side
105‧‧‧發光單元 105‧‧‧Lighting unit
106‧‧‧導光元件 106‧‧‧Light guiding elements
107‧‧‧導光板 107‧‧‧Light guide plate
107a‧‧‧入光面 107a‧‧‧Into the glossy side
107b‧‧‧第三側面 107b‧‧‧ third side
107c‧‧‧第四側面 107c‧‧‧fourth side
108‧‧‧發光單元 108‧‧‧Lighting unit
109‧‧‧反射片 109‧‧‧Reflecting film
110‧‧‧第一偏光板 110‧‧‧First polarizer
110a‧‧‧第一基材層 110a‧‧‧First substrate layer
110b‧‧‧第二基材層 110b‧‧‧Second substrate layer
110c‧‧‧偏光層 110c‧‧‧ polarizing layer
112‧‧‧擴散板 112‧‧‧Diffuser board
113‧‧‧增亮膜 113‧‧‧Brightening film
114‧‧‧反射式偏光增亮膜 114‧‧‧Reflective polarizing film
200‧‧‧背光模組 200‧‧‧Backlight module
203‧‧‧光衰減元件 203‧‧‧Light attenuation components
210‧‧‧第二偏光板 210‧‧‧Second polarizer
210a‧‧‧第三基材層 210a‧‧‧ third substrate layer
210b‧‧‧第四基材層 210b‧‧‧fourth substrate layer
210c‧‧‧聚乙烯醇層 210c‧‧‧ polyvinyl alcohol layer
211‧‧‧黏著層 211‧‧‧Adhesive layer
300‧‧‧背光模組 300‧‧‧Backlight module
303‧‧‧光衰減元件 303‧‧‧Light attenuation components
312‧‧‧光學膜片 312‧‧‧Optical diaphragm
400A‧‧‧背光模組 400A‧‧‧Backlight Module
400B‧‧‧背光模組 400B‧‧‧Backlight Module
403‧‧‧光衰減元件 403‧‧‧Light attenuation components
412‧‧‧光學膜片 412‧‧‧Optical diaphragm
504‧‧‧表面處理結構 504‧‧‧Surface treatment structure
600‧‧‧背光模組 600‧‧‧Backlight module
603‧‧‧光衰減元件 603‧‧‧Light attenuation components
609‧‧‧反射片 609‧‧‧reflector
610‧‧‧偏光板 610‧‧‧Polar plate
611‧‧‧相位差板 611‧‧‧ phase difference plate
X1‧‧‧第一光吸收軸 X1‧‧‧first light absorption axis
X2‧‧‧第二光吸收軸 X2‧‧‧second light absorption axis
X3‧‧‧光吸收軸 X3‧‧‧Light absorption axis
T1、T3、T4‧‧‧光穿透軸 T1, T3, T4‧‧‧ light penetration axis
P1‧‧‧第一偏光軸 P1‧‧‧first polarization axis
P2‧‧‧第二偏光軸 P2‧‧‧second polarizing axis
L1、L1a、L1b、L1b1、L1b2、L2、L2a、L2b、L2c‧‧‧光線 L1, L1a, L1b, L1b1, L1b2, L2, L2a, L2b, L2c‧‧‧ rays
為了對本發明之上述實施例及其他目的、特徵和優點能更明顯易懂，特舉數個較佳實施例，並配合所附圖式，作詳細說明如下：第1A圖係根據本發明的一實施例所繪示的一種背光模組的結構剖面示意圖；第1B圖係根據第1A圖所繪示的一種光衰減元件的局部結構 放大剖面示意圖；第2A圖係根據本發明的另一實施例所繪示的一種背光模組的結構剖面示意圖；第2B圖係根據第2A圖所繪示的一種光衰減元件的局部結構放大剖面示意圖；第3A圖係根據本發明的又一實施例所繪示的一種背光模組的結構剖面示意圖；第3B圖係根據第3A圖所繪示的一種光衰減元件的局部結構放大剖面示意圖；第4A圖係根據本發明的再一實施例所繪示的一種背光模組的結構剖面示意圖；第4B圖係根據本發明的又另一實施例所繪示的一種背光模組的結構剖面示意圖；第4C圖係根據第4A圖和第4B圖所繪示的一種光衰減元件的局部結構放大剖面示意圖；第5圖係根據本發明的一實施例所繪示的一種顯示裝置的結構剖面示意圖；以及第6圖係根據本發明的另一實施例所繪示的一種顯示裝置的結構剖面示意圖。 The above-described embodiments and other objects, features and advantages of the present invention will become more apparent from the embodiments of the invention. A schematic cross-sectional view of a backlight module according to an embodiment; FIG. 1B is a partial structure of a light attenuating element according to FIG. 1A FIG. 2A is a cross-sectional view showing a structure of a backlight module according to another embodiment of the present invention; FIG. 2B is an enlarged cross-sectional view showing a partial structure of a light attenuating element according to FIG. 2A; 3A is a cross-sectional view showing a structure of a backlight module according to another embodiment of the present invention; and FIG. 3B is an enlarged cross-sectional view showing a partial structure of a light attenuating element according to FIG. 3A; 4A is a cross-sectional view showing a structure of a backlight module according to still another embodiment of the present invention; FIG. 4B is a cross-sectional view showing a structure of a backlight module according to still another embodiment of the present invention; FIG. 4C is a schematic cross-sectional view showing a partial structure of a light attenuating element according to FIG. 4A and FIG. 4B. FIG. 5 is a schematic cross-sectional view showing a structure of a display device according to an embodiment of the invention. And FIG. 6 is a schematic cross-sectional view showing a structure of a display device according to another embodiment of the present invention.
本發明提供一種具有二發光模組的背光模組，以及 應用此背光模組的顯示裝置，可以改善此二發光模組之間反因為光反射所造成的影像串擾問題，達到改善顯示裝置品質的效果。 為了對本發明之上述實施例及其他目的、特徵和優點能更明顯易懂，下文特舉數個較佳實施例，並配合所附圖式作詳細說明。 The invention provides a backlight module with two illumination modules, and By using the display device of the backlight module, the image crosstalk problem caused by the light reflection between the two light-emitting modules can be improved, and the quality of the display device can be improved. The above-described embodiments, as well as other objects, features and advantages of the present invention will be more apparent from the description of the appended claims.
但必須注意的是，這些特定的實施案例與方法，並 非用以限定本發明。本發明仍可採用其他特徵、元件、方法及參數來加以實施。較佳實施例的提出，僅係用以例示本發明的技術 特徵，並非用以限定本發明的申請專利範圍。該技術領域中具有 通常知識者，將可根據以下說明書的描述，在不脫離本發明的精神範圍內，作均等的修飾與變化。在不同實施例與圖式之中，相同的元件，將以相同的元件符號加以表示。 But it must be noted that these specific implementation cases and methods, and It is not intended to limit the invention. The invention may be practiced with other features, elements, methods and parameters. The preferred embodiment is presented merely to illustrate the techniques of the present invention. Features are not intended to limit the scope of the claims of the present invention. In the technical field Equivalent modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention. In the different embodiments and the drawings, the same elements will be denoted by the same reference numerals.
請參照第1A圖，第1A圖係根據本發明的一實施例所繪示的一種背光模組100的結構剖面示意圖。此背光模組100包括：第一發光模組101、第二發光模組102以及光衰減元件103。在本發明的一些實施例中，第一發光模組101位於第二發光模組102上方，光衰減元件103位於第一發光模組101和第二發光模組102之間。詳言之，主要用於三維顯示的第一發光模組101係一兼具發光及透光的結構，具有一出光面101a，由第一發光模組101光源所發出的光線L1係穿過出光面101a向外導出；主要用於二維顯示的第二發光模組102則位於第一發光模組101之出光面101a的相反一側，由第二發光模組102光源所發出的光線L2經由第二發光模組102本身之後，再穿過第一發光模組101 由第一發光模組101之出光面101a向外導出。出光面101a係表示此背光模組100出光總歸的終端面，以本實施例而言，係第一發光模組光學元件中的最鄰近於影像顯示面板及觀察者的表面。 1A is a cross-sectional view showing a structure of a backlight module 100 according to an embodiment of the invention. The backlight module 100 includes a first light emitting module 101, a second light emitting module 102, and a light attenuating element 103. In some embodiments of the present invention, the first lighting module 101 is located above the second lighting module 102, and the optical attenuation component 103 is located between the first lighting module 101 and the second lighting module 102. In detail, the first light-emitting module 101, which is mainly used for three-dimensional display, has a light-emitting and light-transmitting structure, and has a light-emitting surface 101a. The light L1 emitted by the light source of the first light-emitting module 101 passes through the light. The surface of the second light-emitting module 102 is mainly located on the opposite side of the light-emitting surface 101a of the first light-emitting module 101, and the light L2 emitted by the light source of the second light-emitting module 102 is passed through After the second lighting module 102 itself passes through the first lighting module 101 The light-emitting surface 101a of the first light-emitting module 101 is outwardly led out. The light-emitting surface 101a is a terminal surface of the backlight module 100. In this embodiment, it is the surface of the first light-emitting module optical element that is closest to the image display panel and the viewer.
在本發明的一些實施例之中，第一發光模組101可以包括一個導光板104、至少一個發光單元105以及複數個導光元件106。其中，導光板104具有至少一個入光面104a或104b以及彼此相對的一個第一側面104c和一個第二側面104d。導光板104的材質可以是玻璃、聚酸甲酯(Polymethylmethacrylate，PMMA)或其他可能的透光材料(但不以此為限)。發光單元105鄰接入光面104a或104b，本實施例發光單元105鄰接入光面104b，於其他實施例中，發光單元105數量亦可為二且分別鄰接入光面104a及入光面104b。複數導光元件106設置於第一側面104c和第二側面104d的至少一者上。 In some embodiments of the present invention, the first lighting module 101 may include a light guide plate 104, at least one light emitting unit 105, and a plurality of light guiding elements 106. The light guide plate 104 has at least one light incident surface 104a or 104b and a first side surface 104c and a second side surface 104d opposite to each other. The material of the light guide plate 104 may be glass, polymethylmethacrylate (PMMA) or other possible light transmissive materials (but not limited thereto). The light-emitting unit 105 is adjacent to the light-incident surface 104a or 104b. In other embodiments, the light-emitting unit 105 can be adjacent to the light-incident surface 104b. Face 104b. The plurality of light guiding elements 106 are disposed on at least one of the first side 104c and the second side 104d.
在本實施例之中，第一發光模組101係一側光式發光模組，具有複數個發光單元105鄰接於與導光板104之厚度方向平行的入光面104a和104b。垂直導光板104之厚度方向的第一側面104c可作為第一發光模組101的出光面101a，第一側面104c為該背光模組100最鄰近於顯示面板及觀察者的表面，也是該導光板104上表面。導光元件106位於與第一側面104c相對的第二側面104d上，也就是位於該導光板104的下表面。但在其他實施例之中，導光元件106亦可僅配置於第一側面104c上或同時配置於第一側面104c和第二側面104d上。 In the embodiment, the first light-emitting module 101 is a one-side light-emitting module, and has a plurality of light-emitting units 105 adjacent to the light-incident surfaces 104a and 104b parallel to the thickness direction of the light guide plate 104. The first side surface 104c of the vertical light guide plate 104 can be used as the light emitting surface 101a of the first light emitting module 101. The first side surface 104c is the surface of the backlight module 100 which is closest to the display panel and the observer. 104 upper surface. The light guiding element 106 is located on the second side surface 104d opposite to the first side surface 104c, that is, on the lower surface of the light guiding plate 104. In other embodiments, the light guiding element 106 may be disposed only on the first side surface 104c or on the first side surface 104c and the second side surface 104d.
在本發明的一些實施例之中，導光元件106可以是規則或不規則排列的突出部(protrusions)、凸條、溝槽(slots)、開口(openings)、凹室(recesses)。另外，每一個導光件(由平行第一側面104c和第二側面104d方向觀察)的剖面形狀，可分別為弧形、多邊形(可包含三角形、正方形、長方形、梯形、正多邊形)或不規則形，可用來破壞導光板104的全反射效應，使光能藉由反射(reflection)或散射(scattering)朝向出光面101a(即導光板104的第一側面104c)出光。該導光元件106藉由條紋狀的分佈模式，達到形成區域出光強度不同(產生亮區或暗區)的柵狀出光圖案(barrier pattern)，使由發光單元105所發出的大部分光線L1a在進入導光板104之後，藉由該些導光元件106之導引，以亮暗交錯排列之形式照射顯示面板，以呈現三維影像。 In some embodiments of the invention, the light directing elements 106 may be regular or irregularly arranged protrusions, ridges, slots, openings, recesses. In addition, the cross-sectional shape of each of the light guides (viewed by the parallel first side 104c and the second side 104d) may be curved, polygonal (may include triangles, squares, rectangles, trapezoids, regular polygons) or irregularities. The shape can be used to destroy the total reflection effect of the light guide plate 104, so that the light energy can be emitted toward the light exit surface 101a (ie, the first side surface 104c of the light guide plate 104) by reflection or scattering. The light guiding element 106 achieves a barrier pattern of different light-emitting intensity (generating a bright region or a dark region) in a stripe-like distribution pattern, so that most of the light L1a emitted by the light-emitting unit 105 is After entering the light guide plate 104, the display panel is illuminated in a staggered arrangement of light and dark by the guiding of the light guiding elements 106 to present a three-dimensional image.
第二發光模組102可以包括一個導光板107、至少一個發光單元108以及反射片109。其中，導光板107位於反射片109和第一發光模組101的導光板104之間，且具有至少一個入光面107a以及彼此相對的一個第三側面107b和一個第四側面107c。發光單元108鄰接入光面107a。導光板107的第三側面107b對映第一發光模組101的導光板104的第二側面104d；反射片109對映導光板107的第四側面107c。反射片109材料為白色散射材質。由發光單元108所發出之光線L2在進入導光板107之後，一部分的光線L2a直接穿過第一發光模組101，另一部分的光線L2b則先經由反射片109反射，再穿過第二發光模組102和 第一發光模組101，由第一發光模組101的出光面101a(即第一發光模組101的導光板104的第一側面104c)導出，藉以形成一個面光源。 The second light emitting module 102 can include a light guide plate 107, at least one light emitting unit 108, and a reflective sheet 109. The light guide plate 107 is located between the reflective sheet 109 and the light guide plate 104 of the first light emitting module 101, and has at least one light incident surface 107a and a third side surface 107b and a fourth side surface 107c opposite to each other. The light emitting unit 108 is adjacent to the light incident surface 107a. The third side surface 107b of the light guide plate 107 is opposite to the second side surface 104d of the light guide plate 104 of the first light emitting module 101; the reflection sheet 109 is opposite to the fourth side surface 107c of the light guide plate 107. The material of the reflection sheet 109 is a white scattering material. After the light L2 emitted by the light emitting unit 108 enters the light guide plate 107, a part of the light L2a directly passes through the first light emitting module 101, and the other part of the light L2b is first reflected by the reflective sheet 109, and then passes through the second light emitting mode. Group 102 and The first light emitting module 101 is derived from the light emitting surface 101a of the first light emitting module 101 (ie, the first side surface 104c of the light guiding plate 104 of the first light emitting module 101), thereby forming a surface light source.
光衰減元件103位於第一發光模組101和第二發光模組102之間。在本發明的一些實施例中，光衰減元件103至少包含一個吸收式線偏光板，例如第一偏光板110，且第一偏光板110具有第一光吸收軸X1。在本實施例之中，光衰減元件103可以是由單一第一偏光板110所構成。請參照第1B圖，第1B圖係根據第1A圖所繪示的一種光衰減元件103的局部結構放大剖面示意圖。第一偏光板110包括第一基材層110a、第二基材層110b以及夾設於第一基材層110a和第二基材層110b之間的偏光層110c(聚乙烯醇Poly-Vinyl Alcohol，PVA)，偏光層110c藉由拉伸及吸收材料佈值可形成具有光吸收率異向性(anisotropic)的功能，達到偏極化的結果。其中，構成第一基材層110a和第二基材層110b的材料可以相同或不同；且構成第一基材層110a和第二基材層110b的材料，可以選自於由三醋酸纖維素(Triacetate Cellulose，TAC)、聚酸甲酯、聚乙烯對苯二甲酸酯(Polyethylene Terephthalate，PET)以及上述之任意組合所組成的一族群。 The light attenuating element 103 is located between the first light emitting module 101 and the second light emitting module 102. In some embodiments of the present invention, the light attenuating element 103 includes at least one absorption line polarizing plate, such as the first polarizing plate 110, and the first polarizing plate 110 has a first light absorption axis X1. In the present embodiment, the light attenuating element 103 may be composed of a single first polarizing plate 110. Please refer to FIG. 1B. FIG. 1B is an enlarged schematic cross-sectional view showing a partial structure of a light attenuating element 103 according to FIG. 1A. The first polarizing plate 110 includes a first substrate layer 110a, a second substrate layer 110b, and a polarizing layer 110c interposed between the first substrate layer 110a and the second substrate layer 110b (polyvinyl alcohol Poly-Vinyl Alcohol) , PVA), the polarizing layer 110c can form a function of light absorption anisotropy by stretching and absorbing the cloth value to achieve the result of polarization. The materials constituting the first base material layer 110a and the second base material layer 110b may be the same or different; and the materials constituting the first base material layer 110a and the second base material layer 110b may be selected from cellulose triacetate. (Triacetate Cellulose, TAC), polymethyl acrylate, polyethylene terephthalate (PET), and a combination of any of the above.
而值得注意的是，為了不影響第一發光模組101的光線由出光面101a導出，在本發明的一些實施例之中，光衰減元件103和第一發光模組101之間存在有一定的空間距離。換言之，光衰減元件103和第一發光模組101並不會直接接觸。例如 在本實施例中，光衰減元件103的第一偏光板110與第一發光模組101的導光元件106之間存在一定的間隔空間(空氣層)，使二者不會直接接觸。 It should be noted that, in order to prevent the light of the first light-emitting module 101 from being led out by the light-emitting surface 101a, in some embodiments of the present invention, there is a certain relationship between the light-attenuating element 103 and the first light-emitting module 101. Space distance. In other words, the light attenuating element 103 and the first light emitting module 101 are not in direct contact. E.g In this embodiment, there is a certain space (air layer) between the first polarizing plate 110 of the light attenuating element 103 and the light guiding element 106 of the first light emitting module 101 so that the two do not directly contact.
另外，為了增加光衰減元件的產品可靠度(reliability)，並防止第一偏光板110在組裝後產生翹曲(waving)，在本發明的一些實施例之中，光衰減元件還可以是由至少兩個偏光板所構成的多層結構，且這些偏光板的光吸收軸係彼此平行。 例如，請參照第2A圖，第2A圖係根據本發明的另一實施例所繪示的一種背光模組200的結構剖面示意圖。背光模組200的結構大致上和第1A圖所繪示的背光模組100類似，差別僅在於光衰減元件203除了包括前述的第一偏光板110，還至少包括一個第二偏光板210，位於第二發光模組102與第一偏光板110之間(即第一偏光板110位於第二偏光板210的上方)。且第二偏光板210具有一第二光吸收軸X2，實質平行第一偏光板110的第一光吸收軸X1。在本發明的另一個實施例中，第二偏光板210可位於和第一發光模組101與第一偏光板110之間(即第二偏光板210位於第一偏光板110的上方)。 In addition, in order to increase the product reliability of the light attenuating element and prevent the first polarizing plate 110 from being warped after assembly, in some embodiments of the present invention, the light attenuating element may also be at least A multilayer structure composed of two polarizing plates, and the light absorption axes of the polarizing plates are parallel to each other. For example, please refer to FIG. 2A. FIG. 2A is a cross-sectional view showing the structure of a backlight module 200 according to another embodiment of the present invention. The structure of the backlight module 200 is substantially similar to that of the backlight module 100 illustrated in FIG. 1A, except that the light attenuating element 203 includes at least one of the first polarizing plates 110 and at least one second polarizing plate 210. The second light emitting module 102 is disposed between the first polarizing plate 110 and the first polarizing plate 110 (ie, the first polarizing plate 110 is located above the second polarizing plate 210). The second polarizing plate 210 has a second light absorption axis X2 substantially parallel to the first light absorption axis X1 of the first polarizing plate 110. In another embodiment of the present invention, the second polarizing plate 210 may be located between the first light emitting module 101 and the first polarizing plate 110 (ie, the second polarizing plate 210 is located above the first polarizing plate 110).
請參照第2B圖，第2B圖係根據第2A圖所繪示的一種光衰減元件203的局部結構放大剖面示意圖。在本實施例中，光衰減元件203係一雙層結構，由第一偏光板110、第二偏光板210以及位於第一偏光板110和第二偏光板210之間的黏著層211所構成。其中，第二偏光板210包括第三基材層210a、第 四基材層210b以及夾設於第三基材層210a和第四基材層210b之間的聚乙烯醇層210c。構成第三基材層210a和第四基材層210b的材料可以相同或不同。且構成第三基材層210a和第四基材層210b的材料，可以是選自於由三醋酸纖維素、聚酸甲酯、聚乙烯對苯二甲酸酯以及上述之任意組合所組成的一族群。黏著層211的材質可以是透光感壓膠(Pressure Sensitive Adhesive，PSA)或其他可能的透光黏著材料。由於第一偏光板110、第二偏光板210的應力翹曲方向相反可相互補償形變的結果，因此具有兩偏光板對貼的光衰減元件203較僅具有單一偏光板的光衰減元件103形變量小。 Please refer to FIG. 2B. FIG. 2B is an enlarged schematic cross-sectional view showing a partial structure of a light attenuating element 203 according to FIG. 2A. In the present embodiment, the light attenuating element 203 is a two-layer structure composed of a first polarizing plate 110, a second polarizing plate 210, and an adhesive layer 211 between the first polarizing plate 110 and the second polarizing plate 210. The second polarizing plate 210 includes a third substrate layer 210a, The four base material layer 210b and the polyvinyl alcohol layer 210c interposed between the third base material layer 210a and the fourth base material layer 210b. The materials constituting the third base material layer 210a and the fourth base material layer 210b may be the same or different. And the material constituting the third base material layer 210a and the fourth base material layer 210b may be selected from the group consisting of cellulose triacetate, polymethyl acrylate, polyethylene terephthalate, and any combination thereof. a group of people. The material of the adhesive layer 211 may be a Pressure Sensitive Adhesive (PSA) or other possible light-transmitting adhesive material. Since the stress warping directions of the first polarizing plate 110 and the second polarizing plate 210 can mutually compensate the deformation results, the light attenuating element 203 having the two polarizing plates facing each other has a light attenuating element 103 having a single polarizing plate. small.
在本發明的一些實施例之中，光衰減元件還可以更包括至少一個光學膜片，位於第一偏光板110和第二偏光板210之間。例如，請參照第3A圖和第3B圖，第3A圖係根據本發明的又一實施例所繪示的一種背光模組300的結構剖面示意圖。第3B圖係根據第3A圖所繪示的一種光衰減元件303的局部結構放大剖面示意圖。其中背光模組300的結構大致上和第2A圖所繪示的背光模組200類似，差別僅在於光衰減元件303的於第一偏光板110和第二偏光板210之間還包括一個由擴散板(diffuser)、增亮膜(Brightness Enhancement Film，BEF)、反射式偏光增亮膜(Dual Brightness Enhancement Film，DBEF)或上述之任意組合所組成的光學膜片312，並且分別藉由黏著層211與第一偏光板110和第二偏光板210結合。 In some embodiments of the present invention, the light attenuating element may further include at least one optical film between the first polarizing plate 110 and the second polarizing plate 210. For example, please refer to FIG. 3A and FIG. 3B . FIG. 3A is a cross-sectional view showing the structure of a backlight module 300 according to another embodiment of the present invention. FIG. 3B is an enlarged schematic cross-sectional view showing a partial structure of a light attenuating element 303 according to FIG. 3A. The structure of the backlight module 300 is substantially similar to that of the backlight module 200 illustrated in FIG. 2A , except that the light attenuating element 303 further includes a diffusion between the first polarizing plate 110 and the second polarizing plate 210 . An optical film 312 composed of a diffuser, a brightness enhancement film (BEF), a dual brightness enhancement film (DBEF), or any combination thereof, and respectively by an adhesive layer 211 It is combined with the first polarizing plate 110 and the second polarizing plate 210.
值得注意的是，配置在第一偏光板110和第二偏光板210之間的光學膜片312若為反射式偏光增亮膜，其光穿透軸T3須實質與第一偏光板110和第二偏光板210的第一光吸收軸X1和第二光吸收軸X2平行。 It should be noted that if the optical film 312 disposed between the first polarizing plate 110 and the second polarizing plate 210 is a reflective polarizing brightness enhancing film, the light transmitting axis T3 must be substantially the same as the first polarizing plate 110 and the first The first light absorption axis X1 of the two polarizing plates 210 is parallel to the second light absorption axis X2.
在本發明的一些實施例之中，光衰減元件還可以更包括至少一個光學膜片，位於第一發光模組101和第二發光模組102二者其中之一與光衰減元件之間。例如，請參照第4A圖至第4C圖，第4A圖係根據本發明的再一實施例所繪示的一種背光模組400A的結構剖面示意圖。第4B圖係根據本發明的又另一實施例所繪示的一種背光模組400B的結構剖面示意圖。第4C圖係根據第4A圖和第4B圖所繪示的一種光衰減元件403的局部結構放大剖面示意圖。其中背光模組400A的結構大致上和第2A圖所繪示的背光模組200類似，差別僅在於光衰減元件403除了包括第一偏光板110，還至少包括一個由擴散板、增亮膜、反射式偏光增亮膜或上述之任意組合所組成的光學膜片412，位於和第二發光模組102與第一偏光板110之間(即光學膜片412配置於第一偏光板110的上方)。背光模組400B的結構也和背光模組400A類似，差別僅在於光衰減元件403的配置方式與背光模組400A不同。在背光模組400B中，光衰減元件403的光學膜片412係位於第一發光模組101和與第一偏光板110之間(即光學膜片412配置於第一偏光板110的下方)。 In some embodiments of the present invention, the light attenuating element may further include at least one optical film between one of the first light emitting module 101 and the second light emitting module 102 and the light attenuating element. For example, please refer to FIG. 4A to FIG. 4C. FIG. 4A is a cross-sectional view showing the structure of a backlight module 400A according to still another embodiment of the present invention. FIG. 4B is a cross-sectional view showing the structure of a backlight module 400B according to still another embodiment of the present invention. FIG. 4C is an enlarged schematic cross-sectional view showing a partial structure of a light attenuating element 403 according to FIGS. 4A and 4B. The structure of the backlight module 400A is substantially similar to that of the backlight module 200 illustrated in FIG. 2A. The only difference is that the light attenuating element 403 includes at least one diffusion plate, a brightness enhancement film, and the like, in addition to the first polarizing plate 110. The optical film 412 of the reflective polarizing film or any combination of the above is located between the second light emitting module 102 and the first polarizing plate 110 (ie, the optical film 412 is disposed above the first polarizing plate 110). ). The structure of the backlight module 400B is similar to that of the backlight module 400A, except that the arrangement of the light attenuating elements 403 is different from that of the backlight module 400A. In the backlight module 400B, the optical film 412 of the light attenuating element 403 is located between the first light emitting module 101 and the first polarizing plate 110 (that is, the optical film 412 is disposed below the first polarizing plate 110).
另外，為了增加第二發光模組102的光取出率，較 佳會在第二發光模組102和光衰減元件103、203和303之間配置至少一個由擴散板112、增亮膜113、反射式偏光增亮膜114或上述之任意組合所組成的光學膜片112(如第1A圖、第2A圖、第3A圖、第4A圖和第4B圖所繪示)。在本發明的一些實施例中，也可以在第一發光模組101和光衰減元件103、203和303之間配置至少一個光學膜片(未繪示)。而值得注意的是，配置在第一發光模組101和第二發光模組102之間的反射式偏光增亮膜114其光穿透軸T1會實質與第一偏光板110和第二偏光板210的第一光吸收軸X1和第二光吸收軸X2平行。光學膜片412若為反射式偏光增亮膜者，其光穿透軸T4也會實質質與第一光吸收軸X1和第二光吸收軸X2平行。 In addition, in order to increase the light extraction rate of the second light emitting module 102, At least one optical film composed of the diffusion plate 112, the brightness enhancement film 113, the reflective polarization enhancing film 114, or any combination thereof, is disposed between the second light emitting module 102 and the light attenuating elements 103, 203, and 303. 112 (as shown in FIG. 1A, FIG. 2A, FIG. 3A, FIG. 4A, and FIG. 4B). In some embodiments of the present invention, at least one optical film (not shown) may also be disposed between the first light emitting module 101 and the light attenuating elements 103, 203, and 303. It should be noted that the reflective polarization enhancing film 114 disposed between the first lighting module 101 and the second lighting module 102 has a light transmitting axis T1 substantially opposite to the first polarizing plate 110 and the second polarizing plate. The first light absorption axis X1 of 210 and the second light absorption axis X2 are parallel. If the optical film 412 is a reflective polarizing film, the light transmission axis T4 is substantially parallel to the first light absorption axis X1 and the second light absorption axis X2.
若將上述的背光模組，例如以背光模組200為例，與顯示面板加以整合，即可構成一個具有可切換二維/三維影像的顯示裝置50。請參照第5圖，第5圖係根據本發明的一實施例所繪示的一種顯示裝置50的結構剖面示意圖。顯示裝置50包括顯示面板51以及第2A圖所繪示的背光模組200。顯示面板51可以是一種液晶顯示面板或其他合適的顯示介質。在本實施例中，顯示面板51可以是一種液晶顯示面板，包括液晶層51a以及分別位於液晶層51a上下兩側的基板(未繪示)，且彼此相對的下偏光板51b和上偏光板51c。下偏光板51b和上偏光板51c分別具有相互正交的第一偏光軸P1和第二偏光軸P2。第一發光模組101的出光面101a(即導光板的第一側面104c)對映顯示面板51的下偏光 板51b；且第一偏光板110和第二偏光板210的第一光吸收軸X1和第二光吸收軸X2與下偏光板51b的第一偏光軸P1實質平行。 If the backlight module described above is used as an example, the backlight module 200 is integrated with the display panel to form a display device 50 having switchable two-dimensional/three-dimensional images. Referring to FIG. 5, FIG. 5 is a cross-sectional view showing the structure of a display device 50 according to an embodiment of the invention. The display device 50 includes a display panel 51 and a backlight module 200 illustrated in FIG. 2A. Display panel 51 can be a liquid crystal display panel or other suitable display medium. In the present embodiment, the display panel 51 may be a liquid crystal display panel including a liquid crystal layer 51a and a substrate (not shown) respectively located on the upper and lower sides of the liquid crystal layer 51a, and the lower polarizing plate 51b and the upper polarizing plate 51c opposed to each other. . The lower polarizing plate 51b and the upper polarizing plate 51c have a first polarization axis P1 and a second polarization axis P2 which are orthogonal to each other. The light emitting surface 101a of the first light emitting module 101 (ie, the first side surface 104c of the light guide plate) reflects the lower polarized light of the display panel 51. The plate 51b; and the first light absorption axis X1 and the second light absorption axis X2 of the first polarizing plate 110 and the second polarizing plate 210 are substantially parallel to the first polarization axis P1 of the lower polarizing plate 51b.
當顯示裝置50要顯示三維影像時，可將第二發光模組102的發光單元108關閉，而只靠第一發光模組101的發光單元105提供光線。由發光單元105所發出的大部分光線L1a，在進入導光板104之後，藉由導光元件106之導引，以亮暗交錯排列之形式由第一發光模組101的出光面101a(即導光板的第一側面104c)導出，射向顯示面板51，將顯示面板51中一部分畫素(未繪示)所輸出的左眼影像傳送至使用者的左眼，並將顯示面板51上另一部分畫素(未繪示)所輸出的右眼影像傳送至使用者的右眼，使得使用者的兩眼可分別接受到具有兩眼視差(binocular parallax)的不同影像，進而讓使用者不需配戴輔助眼鏡就能以裸眼感知立體影像。 When the display device 50 is to display a three-dimensional image, the light-emitting unit 108 of the second light-emitting module 102 can be turned off, and only the light-emitting unit 105 of the first light-emitting module 101 can provide light. The majority of the light L1a emitted by the light-emitting unit 105, after entering the light guide plate 104, is guided by the light guiding element 106, and is arranged by the light-emitting surface 101a of the first light-emitting module 101 in a staggered arrangement. The first side surface 104c) of the light panel is led out to the display panel 51, and the left eye image outputted by a part of the pixels (not shown) in the display panel 51 is transmitted to the left eye of the user, and another part of the display panel 51 is displayed. The right eye image output by the pixel (not shown) is transmitted to the right eye of the user, so that the user's eyes can respectively receive different images with binocular parallax, so that the user does not need to match Wearing stereo glasses can perceive stereoscopic images with the naked eye.
由發光單元105發出的另一部分光線L1b，在進入導光板104之後，由導光板104的第二側面104d導出，射向光衰減元件203。由於光線L1b為非偏極光，因此僅有平行第一偏光板110和第二偏光板210之第一光吸收軸X1和第二光吸收軸X2的偏極光L1b1才能通過光衰減元件203。例如，在本實施例中，衰減元件203的第一偏光板110和第二偏光板210的光穿透率實質介於40%至50%之間。因此，通過光衰減元件203之後再射向第二發光模組102的偏極光L1b1，其光線強度會衰減約50%。而射向第二發光模組102的偏極光L1b1，在經過擴散板 112、增亮膜113、反射式偏光增亮膜114以及第二發光模組102之導光板107和反射片109的反射與散射之後，大部分光線L1b1的偏極狀態會產生改變。因此，當再次射向光衰減元件203時，只有部分仍然平行第一偏光板110和第二偏光板210之第一光吸收軸X1和第二光吸收軸X2的偏極光L1b2能穿過光衰減元件203。換言之光線強度會至少再次衰減約50%。故而，光衰減元件203的配置可以大幅減少由發光單元105發出的光線L1b，受到第二發光模組102再反射穿過出光面101a的光線L1b2的強度。進一步防止未直接由第一發光模組101之出光面101a出射的光線L1b在顯示面板51上產生非預期之亮暗交錯排列的影像，並與直接穿過出光面101a的立體影像產生串擾，達到增進顯示裝置50之立體影像顯示品質的效果。 The other portion of the light ray L1b emitted by the light-emitting unit 105 is led out by the second side surface 104d of the light guide plate 104 after entering the light guide plate 104, and is incident on the light-attenuating element 203. Since the light ray L1b is non-polarized light, only the first light absorbing axis X1 parallel to the first polarizing plate 110 and the second polarizing plate 210 and the polarized light L1b1 of the second light absorbing axis X2 can pass through the light attenuating element 203. For example, in the present embodiment, the light transmittance of the first polarizing plate 110 and the second polarizing plate 210 of the attenuating element 203 is substantially between 40% and 50%. Therefore, the intensity of the light is attenuated by about 50% after passing through the light attenuating element 203 and then toward the polarized light L1b1 of the second light emitting module 102. And the polarized light L1b1 that is incident on the second light emitting module 102 passes through the diffusion plate. 112. After the brightness enhancement film 113, the reflective polarizing brightness enhancement film 114, and the light guide plate 107 of the second light emitting module 102 and the reflection sheet 109 are reflected and scattered, the polarization state of most of the light L1b1 changes. Therefore, when the light attenuating element 203 is again incident, only the partial light absorption axis X1 of the first polarizing plate 110 and the second polarizing plate 210 and the polarized light L1b2 of the second light absorption axis X2 are still able to pass through the light attenuation. Element 203. In other words, the light intensity will decay at least about 50% again. Therefore, the arrangement of the light attenuating element 203 can greatly reduce the intensity of the light L1b emitted by the light emitting unit 105 and the light L1b2 that is reflected by the second light emitting module 102 and reflected through the light exiting surface 101a. Further, the light L1b that is not directly emitted by the light-emitting surface 101a of the first light-emitting module 101 is prevented from being generated by the undesired light-dark interlaced image on the display panel 51, and crosstalk is generated with the stereoscopic image directly passing through the light-emitting surface 101a. The effect of the stereoscopic image display quality of the display device 50 is enhanced.
在本發明的一些實施例中，較佳還可以在光衰減元件203面對第一發光模組101的出光面101a上(即第一基材層110a的上表面)進行一表面處理，藉以在出光面101a上形成至少一個表面處理結構504。此一表面處理結構504可以包括至少一突起部、至少一凸條、至少一溝槽、至少一開口、至少一凹陷部或上述之任意組合。藉由表面處理結構504對光線L1b的散射，可防止射向第二發光模組102的光線L1b被光衰減元件203直接反射，並穿過出光面101a在顯示面板51上產生非預期之亮暗交錯排列的影像，以減少疊紋的發生。在本發明的另一些實施例中，亦可以選擇性地在光衰減元件203面對第二發光模組102的 表面(即第四基材層210b的下表面)上形成上述的表面處理結構504(未繪示)。 In some embodiments of the present invention, it is preferable to perform a surface treatment on the light emitting surface 101a of the first light emitting module 101 facing the light emitting element 203 (ie, the upper surface of the first substrate layer 110a), thereby At least one surface treatment structure 504 is formed on the light exit surface 101a. The surface treatment structure 504 can include at least one protrusion, at least one ridge, at least one groove, at least one opening, at least one recess, or any combination thereof. By the scattering of the light ray L1b by the surface treatment structure 504, the light L1b directed to the second light emitting module 102 can be prevented from being directly reflected by the light attenuating element 203, and the undesired light and darkness is generated on the display panel 51 through the light emitting surface 101a. Staggered images to reduce the occurrence of moiré. In other embodiments of the present invention, the light attenuating element 203 may also be selectively faced to the second light emitting module 102. The surface treatment structure 504 (not shown) described above is formed on the surface (i.e., the lower surface of the fourth substrate layer 210b).
當顯示裝置50要顯示二維影像時，可將第一發光模組101的發光單元105關閉，而只靠第二發光模組102的發光單元108提供光線。由發光單元108發出的光線L2在進入導光板107之後，大部分的光線L2a直接穿過擴散板112、增亮膜113、反射式偏光增亮膜114、光衰減元件203和第一發光模組101；另一部分的光線L2b則先經由反射片109反射，再穿過第二發光模組102、擴散板112、增亮膜113、反射式偏光增亮膜114、光衰減元件203和第一發光模組101，再由第一發光模組101的出光面101a(即第一側面104c)導出，形成一個具有單一偏振態的偏極光L2c，將顯示面板51中之畫素(未繪示)所輸出的平面影像傳送至使用者的雙眼。 When the display device 50 is to display a two-dimensional image, the light-emitting unit 105 of the first light-emitting module 101 can be turned off, and only the light-emitting unit 108 of the second light-emitting module 102 can provide light. After the light L2 emitted by the light emitting unit 108 enters the light guide plate 107, most of the light L2a directly passes through the diffusion plate 112, the brightness enhancement film 113, the reflective polarization enhancing film 114, the light attenuating element 203, and the first light emitting module. 101; another part of the light L2b is first reflected by the reflective sheet 109, and then passes through the second light emitting module 102, the diffusing plate 112, the brightness enhancing film 113, the reflective polarizing brightness enhancing film 114, the light attenuating element 203, and the first light emitting The module 101 is further derived from the light-emitting surface 101a of the first light-emitting module 101 (ie, the first side surface 104c) to form a polarized light L2c having a single polarization state, and the pixels (not shown) in the display panel 51 are The output planar image is transmitted to the user's eyes.
由於，第一偏光板110和第二偏光板210的第一光吸收軸X1和第二光吸收軸X2與下偏光板51b的第一偏光軸P1實質平行。因此，幾乎所有的(實質介於90%至98%之間)偏極光L2c都會穿過下偏光板51b。換言之，光衰減元件203的配置，對於第二發光模組102的實質光取出率影響不大。另外，為了補足第二發光模組102的光取出率，在本發明的一些實施例中，在顯示裝置50顯示平面影像時，亦可將第一發光模組101的至少一部分發光單元105開啟。 Since the first light absorption axis X1 and the second light absorption axis X2 of the first polarizing plate 110 and the second polarizing plate 210 are substantially parallel to the first polarization axis P1 of the lower polarizing plate 51b. Therefore, almost all of the polarized light L2c (which is substantially between 90% and 98%) passes through the lower polarizing plate 51b. In other words, the configuration of the light attenuating element 203 has little effect on the substantial light extraction rate of the second light emitting module 102. In addition, in order to compensate for the light extraction rate of the second light emitting module 102, in some embodiments of the present invention, at least a portion of the light emitting unit 105 of the first light emitting module 101 may be turned on when the display device 50 displays a planar image.
請參照第6圖，第6圖係根據本發明的另一實施例 所繪示的一種顯示裝置60的結構剖面示意圖。由於顯示裝置60與第5圖所繪示之顯示裝置50具有類似的結構，故相同的元件結構並不再贅述。顯示裝置60和顯示裝置50的差別在於光衰減元件603的結構與配置有所不同。在本實施例中，顯示裝置60包括顯示面板51以及背光模組600。背光模組600包括第一發光模組101、反射片609、第二發光模組102以及光衰減元件603。 第一發光模組101具有一出光面101a，面對顯示面板51；反射片609位於出光面101a的相反一側。第二發光模組102，位於第一發光模組101與反射片609之間。光衰減元件603包括偏光板610以及相位差板611。偏光板610具有光吸收軸X6，且位於第二發光模組102與反射片609之間。相位差板611位於偏光板610與反射片609之間。在本發明的一些實施例中，反射片609較佳是一種鏡像反射片。相位差板611可以是四分之一(λ/4)波板。 Please refer to FIG. 6 , which is another embodiment according to the present invention. A schematic cross-sectional view of a structure of a display device 60 is shown. Since the display device 60 has a similar structure to the display device 50 illustrated in FIG. 5, the same component structure will not be described again. The difference between the display device 60 and the display device 50 is that the structure and configuration of the light attenuating element 603 are different. In the embodiment, the display device 60 includes a display panel 51 and a backlight module 600. The backlight module 600 includes a first light emitting module 101, a reflective sheet 609, a second light emitting module 102, and a light attenuating element 603. The first light emitting module 101 has a light emitting surface 101a facing the display panel 51. The reflective sheet 609 is located on the opposite side of the light emitting surface 101a. The second light emitting module 102 is located between the first light emitting module 101 and the reflective sheet 609. The light attenuating element 603 includes a polarizing plate 610 and a phase difference plate 611. The polarizing plate 610 has a light absorption axis X6 and is located between the second light emitting module 102 and the reflective sheet 609. The phase difference plate 611 is located between the polarizing plate 610 and the reflection sheet 609. In some embodiments of the invention, reflective sheet 609 is preferably a mirrored reflective sheet. The phase difference plate 611 may be a quarter (λ/4) wave plate.
當顯示裝置60要顯示三維影像時，可將第二發光模組102的發光單元108關閉，可將第二發光模組102的發光單元108關閉，而只靠第一發光模組的發光單元105提供光線。由發光單元105所發出的大部分光線L1a，在進入導光板104之後，藉由導光元件106之導引，以亮暗交錯排列之形式由第一發光模組101的出光面101a(即導光板的第一側面104c)導出，射向顯示面板51，將顯示面板51中一部分畫素(未繪示)所輸出的左眼影像傳送至使用者的左眼，並將顯示面板51上另一部分畫素(未繪示)所輸出的右眼影像傳送至使用者的右眼，使得使用者的兩眼可分 別接受到具有兩眼視差的不同影像，進而讓使用者不需配戴輔助眼鏡就能以裸眼感知立體影像。 When the display device 60 is to display the three-dimensional image, the light-emitting unit 108 of the second light-emitting module 102 can be turned off, and the light-emitting unit 108 of the second light-emitting module 102 can be turned off, and only the light-emitting unit 105 of the first light-emitting module can be turned off. Provide light. The majority of the light L1a emitted by the light-emitting unit 105, after entering the light guide plate 104, is guided by the light guiding element 106, and is arranged by the light-emitting surface 101a of the first light-emitting module 101 in a staggered arrangement. The first side surface 104c) of the light panel is led out to the display panel 51, and the left eye image outputted by a part of the pixels (not shown) in the display panel 51 is transmitted to the left eye of the user, and another part of the display panel 51 is displayed. The right eye image output by the pixel (not shown) is transmitted to the right eye of the user, so that the user's eyes can be divided Don't accept different images with two-eye parallax, so that users can perceive stereo images with naked eyes without wearing auxiliary glasses.
由發光單元105發出的另一部分光線L1b在進入導光板104之後，則由導光板104的第二側面104d導出，射向第二發光模組102並穿過第二發光模組102和衰減元件603。由於光線L1b為非偏極光，因此，僅有平行偏光板610之光吸收軸X6才能通過光衰減元件603射向相位差板611。在本實施例中，通過光衰減元件603後的偏極光L1b1，其光線強度會衰減約50%。而射向相位差板611的偏極光L1b1，在通過相位差板611後會產生四分之一波長(λ/4)的相位差。當偏極光L1b1被反射片609鏡像反射之後，因偏振狀態改變會被偏光板610阻擋而無法再次穿過第二發光模組102、擴散板112、增亮膜113、反射式偏光增亮膜114和第一發光模組101，由出光面101a導出。故而不會在顯示面板51上產生非預期之亮暗交錯排列的影像，可防止顯示裝置60的立體影像產生影像串擾的現象，達到增進顯示裝置60之立體影像顯示品質的效果。 After entering the light guide plate 104, another portion of the light ray L1b emitted by the light-emitting unit 105 is led out from the second side surface 104d of the light guide plate 104, and is directed to the second light-emitting module 102 and passes through the second light-emitting module 102 and the attenuation element 603. . Since the light ray L1b is non-polarized light, only the light absorption axis X6 of the parallel polarizing plate 610 can be incident on the phase difference plate 611 through the light attenuating element 603. In the present embodiment, the light intensity of the polarized light L1b1 after passing through the light attenuating element 603 is attenuated by about 50%. On the other hand, the polarization beam L1b1 that is incident on the phase difference plate 611 generates a phase difference of a quarter wavelength (λ/4) after passing through the phase difference plate 611. After the polarized light L1b1 is mirror-reflected by the reflective sheet 609, the polarization state is blocked by the polarizing plate 610 and cannot pass through the second light emitting module 102, the diffusing plate 112, the brightness enhancing film 113, and the reflective polarizing brightness enhancing film 114 again. And the first light-emitting module 101 is derived from the light-emitting surface 101a. Therefore, an unintended image of light and dark staggered images is not generated on the display panel 51, and image crosstalk of the stereoscopic image of the display device 60 can be prevented, and the effect of improving the stereoscopic image display quality of the display device 60 can be achieved.
當顯示裝置60要顯示二維影像時，可將第一發光模組101的發光單元108關閉，而只靠第二發光模組的發光單元105提供光線。由發光單元105發出的光線L2在進入導光板107之後，大部分的光線L2a直接穿過、擴散板112、增亮膜113、反射式偏光增亮膜114和第一發光模組101，將顯示面板51中之畫素(未繪示)所輸出的二維影像傳送至使用者的雙眼。由發光單元105 發出的另一部分的光線L2b在進入導光板107之後，則先穿過光衰減元件603經由反射片609鏡像反射後被而不再穿過第二發光模組102和第一發光模組101，由出光面101a導出。在本發明的一些實施例中，為了補足第二發光模組102的光取出率，在顯示裝置50顯示二維影像時，可將第一發光模組101的至少一部分發光單元105開啟。 When the display device 60 is to display a two-dimensional image, the light-emitting unit 108 of the first light-emitting module 101 can be turned off, and only the light-emitting unit 105 of the second light-emitting module can provide light. After the light L2 emitted from the light emitting unit 105 enters the light guide plate 107, most of the light L2a directly passes through the diffusing plate 112, the brightness enhancing film 113, the reflective polarizing brightness enhancing film 114, and the first light emitting module 101, and will be displayed. The two-dimensional image output by the pixels (not shown) in the panel 51 is transmitted to the eyes of the user. Light-emitting unit 105 After the light ray L2b is sent into the light guide plate 107, it is first reflected by the light attenuating element 603 through the reflection sheet 609, and is no longer passed through the second light emitting module 102 and the first light emitting module 101. The light exit surface 101a is derived. In some embodiments of the present invention, in order to complement the light extraction rate of the second light emitting module 102, at least a portion of the light emitting unit 105 of the first light emitting module 101 may be turned on when the display device 50 displays the two-dimensional image.
根據上述，本發明的實施例是提供一種二維/三維可切換式的顯示裝置及其背光模組。在本發明的一些實施例中，此一顯示裝置的背光模組至少包括彼此平行排列的第一發光模組和第二發光模組，可藉由第一發光模組和第二發光模組的切換使用來提供至少二種顯示模式。其中，第一發光模組具有一出光面，並在出光面的相對一側配置一個包含至少一個吸收式偏光版的光衰減元件，來防止由第一發光模組所發出並射向第二發光模組的一部分光線，受到第二發光模組的反射，而產生非預期之亮暗交錯排列的疊紋，進而防止該部分光線與由第一發光模組所發出且直接穿過出光面的光線產生串擾現象。可以改善顯示裝置採用第一發光模組時的顯示品質，而不會影響切換成第二種顯示模式時的顯示品質。 According to the above, an embodiment of the present invention provides a two-dimensional/three-dimensional switchable display device and a backlight module thereof. In some embodiments of the present invention, the backlight module of the display device includes at least a first light emitting module and a second light emitting module arranged in parallel with each other, and the first light emitting module and the second light emitting module are Switch to use to provide at least two display modes. The first light-emitting module has a light-emitting surface, and a light-attenuating element including at least one absorption-type polarizing plate is disposed on the opposite side of the light-emitting surface to prevent the first light-emitting module from being emitted and directed to the second light-emitting layer. A part of the light of the module is reflected by the second light-emitting module, and an undesired light-dark staggered pattern is generated, thereby preventing the part of the light from being emitted by the first light-emitting module and directly passing through the light-emitting surface. Crosstalk is generated. The display quality when the display device adopts the first light-emitting module can be improved without affecting the display quality when switching to the second display mode.
雖然本發明已以較佳實施例揭露如上，然其並非用以限定本發明，任何該技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作些許之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 While the invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and it is to be understood by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.
50‧‧‧顯示裝置 50‧‧‧ display device
51‧‧‧顯示面板 51‧‧‧ display panel
51a‧‧‧液晶層 51a‧‧‧Liquid layer
51b‧‧‧下偏光板 51b‧‧‧Lower polarizer
51c‧‧‧上偏光板 51c‧‧‧Upper polarizer
101‧‧‧第一發光模組 101‧‧‧First lighting module
101a‧‧‧出光面 101a‧‧‧Glossy
102‧‧‧第二發光模組 102‧‧‧Second lighting module
104‧‧‧導光板 104‧‧‧Light guide plate
104a‧‧‧入光面 104a‧‧‧Glossy
104b‧‧‧入光面 104b‧‧‧Glossy
104c‧‧‧第一側面 104c‧‧‧ first side
104d‧‧‧第二側面 104d‧‧‧ second side
105‧‧‧發光單元 105‧‧‧Lighting unit
106‧‧‧導光元件 106‧‧‧Light guiding elements
107‧‧‧導光板 107‧‧‧Light guide plate
107a‧‧‧入光面 107a‧‧‧Into the glossy side
107b‧‧‧第三側面 107b‧‧‧ third side
107c‧‧‧第四側面 107c‧‧‧fourth side
108‧‧‧發光單元 108‧‧‧Lighting unit
109‧‧‧反射片 109‧‧‧Reflecting film
110‧‧‧第一偏光板 110‧‧‧First polarizer
112‧‧‧擴散板 112‧‧‧Diffuser board
113‧‧‧增亮膜 113‧‧‧Brightening film
114‧‧‧反射式偏光增亮膜 114‧‧‧Reflective polarizing film
200‧‧‧背光模組 200‧‧‧Backlight module
203‧‧‧光衰減元件 203‧‧‧Light attenuation components
210‧‧‧第二偏光板 210‧‧‧Second polarizer
504‧‧‧表面處理結構 504‧‧‧Surface treatment structure
X1‧‧‧第一光吸收軸 X1‧‧‧first light absorption axis
X2‧‧‧第二光吸收軸 X2‧‧‧second light absorption axis
T1‧‧‧光穿透軸 T1‧‧‧Light penetration axis
P1‧‧‧第一偏光軸 P1‧‧‧first polarization axis
P2‧‧‧第二偏光軸 P2‧‧‧second polarizing axis
L1、L1a、L1b、L1b1、L1b2、L2、L2a、L2b‧‧‧光線 L1, L1a, L1b, L1b1, L1b2, L2, L2a, L2b‧‧‧ rays
Claims (18)
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