TWI658294B - Backlight module with switchable viewing angles and related electronic device - Google Patents
Backlight module with switchable viewing angles and related electronic device Download PDFInfo
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Abstract
在可切換視角之背光模組中,第一導光板用來將第一光源模組所提供之第一光線導引至一出光方向,而第二導光板用來將第二光源模組所提供之第二光線導引至出光方向。第一反射板設置於第一導光板和第二導光板之間,用來將第一導光板之漏光反射而導入第一導光板。第二反射板用來將第二導光板之漏光反射而導入第二導光板。光柵層設置於第一反射板和第二導光板之間,用來縮小第二導光板之出光視角。 In the backlight module with switchable viewing angle, the first light guide plate is used to guide the first light provided by the first light source module to a light emitting direction, and the second light guide plate is used to guide the first light provided by the second light source module. The second light is guided to the light emitting direction. The first reflecting plate is disposed between the first light guide plate and the second light guide plate, and is configured to reflect the light leakage from the first light guide plate and introduce the light into the first light guide plate. The second reflecting plate is used to reflect the leaked light of the second light guide plate into the second light guide plate. The grating layer is disposed between the first reflective plate and the second light guide plate, and is used to reduce the light emitting angle of the second light guide plate.
Description
本發明提供一種背光模組及相關電子裝置,尤指一種可切換視角之背光模組及相關電子裝置以提供防窺功能。 The present invention provides a backlight module and related electronic devices, and more particularly, a backlight module and related electronic devices with switchable viewing angles to provide a privacy function.
隨著科技技術的發展,可攜式電子裝置,如手機、電子書或筆記型電腦等已成為人們每日生活與工作上在溝通時所不可或缺的工具。使用者往往在擁擠的公眾場合中(如大眾運輸系統上)使用可攜式裝置進行即時通訊、瀏覽網頁、運行社群軟體等,因而大大地增加了個人資料洩漏的風險。目前業界使用的視角窄化技術或防窺技術,通常是在顯示裝置的表面另外貼附或安裝一片具有防窺功能的高分子膜片,藉由高分子膜片具有阻擋光線的物理特性,讓使用者在固定的視野範圍內能看到平面顯示裝置的顯示畫面,而其他人在該視野範圍之外的區域則無法觀看到顯示畫面。然而,使用此高分子膜片的缺點在於必須額外在顯示裝置外貼附具有一定厚度的膜片,因此會增加平面顯示裝置的成本與厚度。此外,外掛式防窺片也需使用者手動切換防窺與否,造成使用上的不便。 With the development of science and technology, portable electronic devices, such as mobile phones, e-books or notebook computers, have become indispensable tools for people to communicate in daily life and work. Users often use portable devices in crowded public places (such as on mass transit systems) for instant messaging, browsing the web, and running social software, which greatly increases the risk of personal data leakage. At present, the viewing angle narrowing technology or anti-peeping technology used in the industry usually attaches or installs a polymer film with anti-peep function on the surface of the display device. The polymer film has the physical properties of blocking light, so that The user can see the display screen of the flat display device in a fixed field of view, but other people cannot see the display screen in areas outside the field of view. However, the disadvantage of using this polymer film is that a film with a certain thickness must be additionally attached to the display device, which will increase the cost and thickness of the flat display device. In addition, the plug-in anti-peeper also requires the user to manually switch the anti-peeper or not, which causes inconvenience in use.
本發明提供一種背光模組,其包含一第一光源模組,用來提供一第一光線;一第二光源模組,用來提供一第二光線;一第一導光板,用來將該第一光線導引至一出光方向;一第二導光板,用來將該第二光線導引至該出光方向;一第一反射板,設置於該第一導光板和該第二導光板之間,用來將該第一導光板之漏光反射而導入該第一導光板;一第二反射板,用來將該第二導光板之漏光反射而導入該第二導光板;以及一光柵層,設置於該第一反射板和該第二導光板之間,用來縮小該第二導光板之出光視角。 The present invention provides a backlight module, which includes a first light source module for providing a first light; a second light source module for providing a second light; a first light guide plate for The first light is guided to a light emitting direction; a second light guide plate is used to guide the second light to the light emitting direction; a first reflecting plate is disposed between the first light guide plate and the second light guide plate For reflecting the light leakage of the first light guide plate into the first light guide plate; a second reflection plate for reflecting the light leakage of the second light guide plate into the second light guide plate; and a grating layer Is disposed between the first reflective plate and the second light guide plate, and is used to reduce the light-emitting angle of the second light guide plate.
本發明另提供一種電子裝置,其包含一顯示螢幕、一背光模組,以及一控制器。該背光模組包含一第一光源模組,用來提供一第一光線;一第二光源模組,用來提供一第二光線;一第一導光板,用來將該第一光線導引至該顯示螢幕;一第二導光板,用來將該第二光線導引至該顯示螢幕;一第一反射板,設置於該第一導光板和該第二導光板之間,用來將該第一導光板之漏光反射而導入該第一導光板;一第二反射板,用來將該第二導光板之漏光反射而導入該第二導光板;以及一光柵層,設置於該第一反射板和該第二導光板之間,用來縮小該第二導光板之出光視角。該控制器用來判斷該電子裝置所選定之一顯示模式;當判斷該電子裝置選定一共享模式時,開啟該第一光源模組以提供具一第一光視角之該第一光線至該顯示螢幕;且當判斷該電子裝置選定一隱私模式時,開啟該第二光源模組以提供具一第二光視角之該第二光線至該顯示螢幕,其中該第二光視角小於該第一光視角。 The invention further provides an electronic device, which includes a display screen, a backlight module, and a controller. The backlight module includes a first light source module for providing a first light, a second light source module for providing a second light, and a first light guide plate for guiding the first light. To the display screen; a second light guide plate for guiding the second light to the display screen; a first reflective plate disposed between the first light guide plate and the second light guide plate for Light leakage reflection of the first light guide plate is introduced into the first light guide plate; a second reflection plate is used to reflect the light leakage of the second light guide plate into the second light guide plate; and a grating layer is disposed on the first light guide plate. A reflecting plate and the second light guide plate are used to reduce a light emitting angle of the second light guide plate. The controller is used to determine a display mode selected by the electronic device; when it is determined that the electronic device selects a sharing mode, the first light source module is turned on to provide the first light with a first light angle to the display screen And when it is judged that the electronic device selects a privacy mode, turning on the second light source module to provide the second light with a second light angle to the display screen, wherein the second light angle is smaller than the first light angle .
10‧‧‧反射式增亮膜 10‧‧‧Reflective Brightening Film
20‧‧‧稜鏡片 20‧‧‧ cymbals
30‧‧‧擴散膜 30‧‧‧ diffuser
40‧‧‧光柵層 40‧‧‧ grating layer
42‧‧‧阻光區域 42‧‧‧light blocking area
44‧‧‧出光區域 44‧‧‧light-emitting area
50‧‧‧孔洞 50‧‧‧ Hole
52‧‧‧顯示螢幕 52‧‧‧display
54‧‧‧閘極驅動電路 54‧‧‧Gate driving circuit
56‧‧‧源極驅動電路 56‧‧‧Source driving circuit
58‧‧‧控制器 58‧‧‧controller
61‧‧‧第一區域 61‧‧‧First Zone
62‧‧‧第二區域 62‧‧‧Second Zone
100、200‧‧‧背光模組 100, 200‧‧‧ backlight module
500‧‧‧電子裝置 500‧‧‧ electronic device
610~650‧‧‧步驟 610 ~ 650‧‧‧step
S1、S2‧‧‧使用者的視線 S1, S2 ‧‧‧ user's sight
M1、M2‧‧‧畫面 M1, M2‧‧‧ screen
LPG1、LPG2‧‧‧導光板 LPG1, LPG2‧‧‧light guide plate
RF1、RF2‧‧‧反射板 RF1, RF2‧‧‧ reflector
LED1、LED2‧‧‧光源模組 LED1, LED2‧‧‧light source module
第1圖為本發明一實施例中一種提供可切換視角之背光模組的示意圖。 FIG. 1 is a schematic diagram of a backlight module with a switchable viewing angle according to an embodiment of the present invention.
第2圖為本發明另一實施例中一種提供可切換視角之背光模組的示意圖。 FIG. 2 is a schematic diagram of a backlight module with a switchable viewing angle according to another embodiment of the present invention.
第3圖顯示了本發明實施例中光柵層之上視圖。 Figure 3 shows a top view of a grating layer in an embodiment of the invention.
第4圖顯示了本發明實施例中導光板之上視圖。 FIG. 4 shows a top view of the light guide plate in the embodiment of the present invention.
第5圖顯示了本發明實施例中背光模組可應用之電子裝置的功能方塊圖。 FIG. 5 shows a functional block diagram of an electronic device to which the backlight module can be applied in the embodiment of the present invention.
第6圖顯示了本發明實施例中電子裝置運作時之流程圖。 FIG. 6 shows a flowchart of the operation of the electronic device in the embodiment of the present invention.
第7圖和第8圖顯示了本發明實施例中背光模組在共享模式下運作時之示意圖。第9圖和第10圖顯示了本發明實施例中背光模組在隱私模式下運作時之示意圖。 FIG. 7 and FIG. 8 show schematic diagrams of the backlight module when the backlight module operates in a sharing mode according to an embodiment of the present invention. FIG. 9 and FIG. 10 show schematic diagrams of the backlight module when the backlight module is operated in a privacy mode according to an embodiment of the present invention.
第11圖顯示了本發明實施例中電子裝置在共享模式下運作時之示意圖。 FIG. 11 shows a schematic diagram of an electronic device operating in a sharing mode according to an embodiment of the present invention.
第12圖顯示了本發明實施例中電子裝置在隱私模式下運作時之示意圖。 FIG. 12 shows a schematic diagram of an electronic device operating in a privacy mode according to an embodiment of the present invention.
第1圖為本發明一實施例中一種提供可切換視角之背光模組100的示意圖。第2圖為本發明另一實施例中一種提供可切換視角之背光模組200的示意圖。背光模組100和背光模組200各包含一反射式增亮膜(dual brightness enhancement film,DBEF)10、一稜鏡片(prism film)20、一擴散膜(diffuserfilm)30、一光柵層40、兩導光板(light guide plate)LPG1 和LPG2、兩反射板RF1和RF2,以及兩光源模組LED1和LED2。 FIG. 1 is a schematic diagram of a backlight module 100 with a switchable viewing angle according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a backlight module 200 with a switchable viewing angle according to another embodiment of the present invention. The backlight module 100 and the backlight module 200 each include a dual brightness enhancement film (DBEF) 10, a prism film 20, a diffuser film 30, a grating layer 40, two Light guide plate LPG1 And LPG2, two reflection plates RF1 and RF2, and two light source modules LED1 and LED2.
在本發明中,反射板RF1設置於導光板LPG1的下側和導光板LPG2的上側之間,而反射板RF2設置於導光板LPG2的下側。導光板LPG1和LPG2可分別將光源模組LED1和LED2提供的點光源導引成平面光源至擴散膜30。在第1圖所示之背光模組100中,光源模組LED1和LED2分別設置在導光板LPG1和LPG2的同一側邊。在第2圖所示之背光模組100中,光源模組LED1和LED2分別設置在導光板LPG1和LPG2的對向側邊。然而,光源模組LED1和LED2之設置位置並不限定本發明之範疇。 In the present invention, the reflection plate RF1 is provided between the lower side of the light guide plate LPG1 and the upper side of the light guide plate LPG2, and the reflection plate RF2 is provided under the light guide plate LPG2. The light guide plates LPG1 and LPG2 can respectively guide the point light sources provided by the light source modules LED1 and LED2 into a planar light source to the diffusion film 30. In the backlight module 100 shown in FIG. 1, the light source modules LED1 and LED2 are respectively disposed on the same side of the light guide plates LPG1 and LPG2. In the backlight module 100 shown in FIG. 2, the light source modules LED1 and LED2 are disposed on opposite sides of the light guide plates LPG1 and LPG2, respectively. However, the positions of the light source modules LED1 and LED2 do not limit the scope of the present invention.
導光板LPG1和LPG2的底面包含印刷圖案擴散點,當光源模組LED1和LED2所提供的光源抵達導光板LPG1和LPG2的底面時,利用疏密、大小不同的擴散點圖案設計可破壞光線的全反射,進而讓反射光往各個角度擴散以形成平面光源,並將光線導引至導光板LPG1和LPG2上表面。另一方面,反射板RF1和反射板RF2可分別將導光板LPG1和LPG2之底面漏光再次反射導入導光板LPG1和LPG2,進而提升光學使用效率。 The bottom surfaces of the light guide plates LPG1 and LPG2 contain printed pattern diffusion points. When the light sources provided by the light source modules LED1 and LED2 reach the bottom surfaces of the light guide plates LPG1 and LPG2, the use of dense and different diffusion point pattern designs can destroy the entire light Reflect, and then diffuse the reflected light to various angles to form a planar light source, and guide the light to the upper surfaces of the light guide plates LPG1 and LPG2. On the other hand, the reflective plates RF1 and RF2 can reflect the light leakage from the bottom surfaces of the light guide plates LPG1 and LPG2 to the light guide plates LPG1 and LPG2 respectively, thereby improving the optical use efficiency.
第3圖顯示了本發明實施例中光柵層40之上視圖。光柵層40包含一阻光區域42(塗黑部分)和一出光區域44,阻光區域42可在導光板LPG2之出光側(上表面)或反射板RF1之下方印刷上不透光材質而形成,因此可縮小導光板LPG2之出光視角。在第3圖所示之實施例中,光柵層40採用條紋狀圖案設計。在其它實施例中,光柵層40之阻光區 域42和出光區域44亦可採用其它圖案設計,光柵層40之圖案並不限定本發明之範疇。 FIG. 3 shows a top view of the grating layer 40 in the embodiment of the present invention. The grating layer 40 includes a light-blocking region 42 (black-coated portion) and a light-emitting region 44. The light-blocking region 42 can be formed by printing an opaque material on the light-emitting side (upper surface) of the light guide plate LPG2 or under the reflection plate RF1. Therefore, the light emitting angle of the light guide plate LPG2 can be reduced. In the embodiment shown in FIG. 3, the grating layer 40 is designed with a stripe pattern. In other embodiments, the light blocking region of the grating layer 40 The domain 42 and the light-exiting region 44 can also be designed with other patterns. The pattern of the grating layer 40 does not limit the scope of the present invention.
第4圖顯示了本發明實施例中導光板LPG1之上視圖。導光板LPG1包含對應出光區域44之一第一區域61和對應阻光區域42之一第二區域62,其至少在第一區域61包含複數個可透光之孔洞50,因此可讓導光板LPG2發出之光線通過。值得注意的是,孔洞50之形狀和數量並不限定本發明之範疇。 FIG. 4 shows a top view of the light guide plate LPG1 in the embodiment of the present invention. The light guide plate LPG1 includes a first area 61 corresponding to the light-exiting area 44 and a second area 62 corresponding to the light-blocking area 42. The light guide plate LPG1 includes a plurality of light-transmissive holes 50 at least in the first area 61. The emitted light passed. It should be noted that the shape and number of the holes 50 do not limit the scope of the present invention.
在第1圖所示之背光模組100和第2圖所示之背光模組200中,擴散膜30設置於導光板LPG1的上方,其作用是讓射出的光分佈更加均勻。擴散膜30的上方可設置有聚光作用的稜鏡片20,進而增加出射光的方向性以提高正面亮度。稜鏡片20的上方可設置包含稜鏡結構之反射式增亮膜10,可將原本四散的光線集中至正視角(on-axis)以更加提高亮度。然而,反射式增亮膜10、稜鏡片20和擴散膜30等光學元件之設置方式並不限定本發明之範疇。 In the backlight module 100 shown in FIG. 1 and the backlight module 200 shown in FIG. 2, the diffusion film 30 is disposed above the light guide plate LPG1, and its function is to make the emitted light more uniform. A cymbal 20 having a light-concentrating effect may be disposed above the diffusion film 30, thereby increasing the directivity of the emitted light to improve frontal brightness. A reflective brightness-enhancing film 10 including a ytterbium structure can be disposed above the cymbal 20, which can concentrate the scattered light to the on-axis to further increase the brightness. However, the arrangement of the optical elements such as the reflective brightness enhancement film 10, the louver 20, and the diffusion film 30 does not limit the scope of the present invention.
第5圖顯示了本發明實施例中背光模組100和200可應用之電子裝置500的功能方塊圖。電子裝置500包含一顯示螢幕52、一閘極驅動電路54、一源極驅動電路56、一控制器58,以及背光模組100或200。本發明之背光模組100和200可應用在任何包含顯示螢幕之電子裝置500,例如筆記型電腦、平板電腦、手機或電視機等。然而,電子裝置500之種類並不限定本發明之範疇。 FIG. 5 shows a functional block diagram of an electronic device 500 to which the backlight modules 100 and 200 can be applied according to an embodiment of the present invention. The electronic device 500 includes a display screen 52, a gate driving circuit 54, a source driving circuit 56, a controller 58, and a backlight module 100 or 200. The backlight modules 100 and 200 of the present invention can be applied to any electronic device 500 including a display screen, such as a notebook computer, a tablet computer, a mobile phone, or a television. However, the type of the electronic device 500 does not limit the scope of the present invention.
電子裝置500可在一共享模式或一隱私模式下運作,第6圖顯示了本發明實施例中電子裝置500運作時之流程圖,其包含下列步驟: The electronic device 500 can operate in a sharing mode or a privacy mode. FIG. 6 shows a flowchart of the operation of the electronic device 500 in the embodiment of the present invention, which includes the following steps:
步驟610:開始。 Step 610: Start.
步驟620:控制器58判斷電子裝置500所選定之顯示模式;當選定共享模式時,執行步驟630;當選定隱私模式時,執行步驟640。 Step 620: The controller 58 determines the display mode selected by the electronic device 500; when the sharing mode is selected, step 630 is performed; when the privacy mode is selected, step 640 is performed.
步驟630:控制器58開啟光源模組LED1;執行步驟650。 Step 630: The controller 58 turns on the light source module LED1; step 650 is performed.
步驟640:控制器58開啟光源模組LED2;執行步驟650。 Step 640: The controller 58 turns on the light source module LED2; step 650 is performed.
步驟650:控制器58控制閘極驅動電路54和源極驅動電路56以驅動顯示螢幕52;執行步驟620。 Step 650: The controller 58 controls the gate driving circuit 54 and the source driving circuit 56 to drive the display screen 52. Step 620 is performed.
在步驟620中,使用者可利用鍵盤或軟體來設定電子裝置500之顯示模式。當選定共享模式時,電子裝置500之控制器58會於步驟630中開啟光源模組LED1;當選定隱私模式時,電子裝置500之控制器58會於步驟640中開啟光源模組LED2。在一實施例中,本發明可利用嵌入式顯示埠(embedded DisplayPort,eDP)的AUX通道或控制器58之通用型輸入輸出(General-purpose input/output,GPIO)來設定電子裝置500之顯示模式。然而,顯示模式之設定方式並不限定本發明之範疇。 In step 620, the user may use a keyboard or software to set a display mode of the electronic device 500. When the sharing mode is selected, the controller 58 of the electronic device 500 turns on the light source module LED1 in step 630; when the privacy mode is selected, the controller 58 of the electronic device 500 turns on the light source module LED2 in step 640. In one embodiment, the present invention may use the AUX channel of the embedded display port (eDP) or the general-purpose input / output (GPIO) of the controller 58 to set the display mode of the electronic device 500. . However, the setting mode of the display mode does not limit the scope of the present invention.
第7圖顯示了本發明實施例中背光模組100在共享模式下運作時之示意圖。第8圖顯示了本發明實施例中背光模組200在共享模式下運作時之示意圖。在共享模式下,光源模組LED1為開啟而光源模組LED2為關閉,此時導光板LPG1和反射板RF1可將光源模組LED1發出之光線反射導入擴散膜30,在依序經過稜鏡片20和反射式增亮膜10後, 本發明背光模組100和200在共享模式下可提供出光視角為θ 1之光源至顯示螢幕52。 FIG. 7 is a schematic diagram of the backlight module 100 in the sharing mode according to an embodiment of the present invention. FIG. 8 shows a schematic diagram of the backlight module 200 in the shared mode according to an embodiment of the present invention. In the sharing mode, the light source module LED1 is on and the light source module LED2 is off. At this time, the light guide plate LPG1 and the reflection plate RF1 can reflect the light emitted by the light source module LED1 into the diffusion film 30 and pass through the cymbals 20 in sequence And reflective brightening film 10, The backlight modules 100 and 200 of the present invention can provide a light source with a light output angle of θ 1 to the display screen 52 in a sharing mode.
第9圖顯示了本發明實施例中背光模組100在隱私模式下運作時之示意圖。第10圖顯示了本發明實施例中背光模組200在隱私模式下運作時之示意圖。在隱私模式下,光源模組LED1為關閉而光源模組LED2為開啟,此時導光板LPG2和反射板RF2可將光源模組LED2發出之光線反射導入光柵層40來縮小出光視角,再通過導光板LPG1之孔洞50抵達擴散膜30。在依序經過稜鏡片20和反射式增亮膜10後,本發明背光模組100和200在隱私模式下可提供出光視角為θ 2之光源至顯示螢幕52,其中θ 2<θ 1。 FIG. 9 shows a schematic diagram of the backlight module 100 in a privacy mode according to an embodiment of the present invention. FIG. 10 shows a schematic diagram of the backlight module 200 in a privacy mode according to an embodiment of the present invention. In the privacy mode, the light source module LED1 is turned off and the light source module LED2 is turned on. At this time, the light guide plate LPG2 and the reflection plate RF2 can reflect the light emitted by the light source module LED2 into the grating layer 40 to reduce the light angle of view, and then guide the light through The hole 50 of the light plate LPG1 reaches the diffusion film 30. After passing through the cymbal 20 and the reflective brightness enhancement film 10 in sequence, the backlight modules 100 and 200 of the present invention can provide a light source with a light viewing angle of θ 2 to the display screen 52 in a privacy mode, where θ 2 <θ 1.
第11圖顯示了本發明實施例中電子裝置500在共享模式下運作時之示意圖。第12圖顯示了本發明實施例中電子裝置500在隱私模式下運作時之示意圖。在第11圖和第12圖,使用者A和使用者B皆位於電子裝置500之顯示範圍,其中使用者A為電子裝置500的操作者,箭頭S1代表使用者A的視線,箭頭S2代表使用者B的視線,畫面M1為使用者A所看到的影像,而畫面M2為使用者B所看到的影像。在共享模式下,電子裝置500中本發明背光模組100或200可提供出較大光視角θ 1,使得使用者A和使用者B皆能看到顯示螢幕52上的影像。在隱私模式下,電子裝置500中本發明背光模組100或200可提供出較小光視角θ 2,此時只有使用者A能看到顯示螢幕52上的影像,而使用者B只能看到全黑畫面以提供防窺功能。 FIG. 11 shows a schematic diagram of the electronic device 500 operating in a sharing mode according to an embodiment of the present invention. FIG. 12 shows a schematic diagram of the electronic device 500 operating in a privacy mode according to an embodiment of the present invention. In FIG. 11 and FIG. 12, the user A and the user B are both located in the display range of the electronic device 500, where the user A is an operator of the electronic device 500, the arrow S1 represents the line of sight of the user A, and the arrow S2 represents use In the sight of the user B, the picture M1 is an image seen by the user A, and the picture M2 is an image seen by the user B. In the sharing mode, the backlight module 100 or 200 of the present invention in the electronic device 500 can provide a larger light angle θ 1, so that both the user A and the user B can see the image on the display screen 52. In the privacy mode, the backlight module 100 or 200 of the present invention in the electronic device 500 can provide a smaller light angle of view θ 2. At this time, only the user A can see the image on the display screen 52, and the user B can only see Go to black screen to provide anti-peep function.
綜上所述,本發明提供一種可切換視角之背光模組,在應用至電子裝置時,可在共享模式下提供具一第一光視角之光線至顯示螢幕,並在隱私模式下提供具一第二光視角之光線至顯示螢幕,其中第二光視角小於第一光視角。 In summary, the present invention provides a backlight module with switchable viewing angles. When applied to an electronic device, it can provide light with a first light angle to the display screen in the sharing mode, and provide a backlight module in the privacy mode. The light from the second light angle reaches the display screen, wherein the second light angle is smaller than the first light angle.
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 description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.
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