CN112198708A - 背光模组及包含该背光模组的显示装置 - Google Patents
背光模组及包含该背光模组的显示装置 Download PDFInfo
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Abstract
提供了一种背光模组和包括该背光模组的显示装置。背光模组包括基板、以及布置在基板上的多个微型LED。所述多个微型LED包括微型LED阵列,所述微型LED阵列包括多个LED子阵列,所述微型LED阵列中的各LED子阵列的发光参数被独立地控制。微型LED的尺寸相对于常规的LED要小得多,且具有较高的发光效率,因此,应用微型LED的背光模组可以不设置导光板,这使得背光模组的整体厚度得以大大降低,从而也有利于应用该背光模组的显示装置的薄化。
Description
技术领域
本发明涉及显示技术领域,具体地涉及一种背光模组、包含该背光模组的显示装置。
背景技术
液晶显示装置已经在人们的日常工作和生活中得到广泛的应用,而且其显示性能也随着人们需求不断地在提升。另外,在很多应用场合,人们期望显示装置的整体厚度越小越好,以提升显示装置的使用方面的灵活性和用户的舒适度。背光模组是液晶显示装置的重要部件,背光模组的厚度对整个显示装置的整体厚度有着很大的影响。
发明内容
本发明的实施例提供了一种背光模组,其包括基板、以及布置在基板上的多个微型LED,所述多个微型LED包括微型LED阵列,所述微型LED阵列包括多个LED子阵列,所述微型LED阵列中的各LED子阵列的发光参数被独立地控制。
根据本发明的一些实施例,每个LED子阵列由M行微型LED和M列微型LED组成,M是大于等于2的整数。
根据本发明的一些实施例,背光模组还包括位于所述微型LED阵列上方的光扩散层,所述光扩散层与所述微型LED直接接触。
根据本发明的一些实施例,光扩散层包括位于所述微型LED阵列上方、与微型LED接触的两层光扩散膜。
根据本发明的一些实施例,背光模组还包括处于所述光扩散层上方的光转换层、处于所述光转换层上方的光汇聚元件和增亮薄膜,其中所述光转换层包括量子点材料。
根据本发明的一些实施例,所述多个LED子阵列中的每个LED子阵列所占据区域的长度和宽度均大于等于1.67mm。
根据本发明的一些实施例,微型LED包括未封装的发蓝光的微型LED芯片,所述基板是柔性基板。
本发明的另外的实施例提供了一种显示装置,包括如前述的任一实施例所述的背光模组、和处于所述背光模组的出光侧的显示面板。
根据本发明的一些实施例,显示面板的像素分辨率为P*Q,所述背光模组的基板包括显示区,所述显示区包括C*D个子显示区,所述背光模组的各个LED子阵列分别布置在所述C*D个子显示区内,其中C表示沿所述显示区的长度方向的每行子显示区中子显示区的数目,D表示沿所述显示区的宽度方向的每列子显示区中子显示区的数目,且C和D分别是能够由P和Q整除的整数。
根据本发明的一些实施例,背光模组的基板的显示区的长度和宽度分别为L毫米和W毫米,其中参数C小于L/1.67,D小于W/1.67。
以上简要描述了本发明的一些实施例,这些实施例以及这些实施例中的技术特征可以以不同方式组合,从而得到不同的另外的实施例,这些另外的实施例也属于本申请的保护范围。
附图说明
下面,参考附图更详细地并且通过非限制性的示例方式描述本发明的实施例,以提供对本发明的原理和精神的透彻理解。其中:
图1示意性地示出了根据本发明的一个实施例的背光模组的俯视图;
图2用于示意性地说明背光模组可能导致的灯影现象;
图3和图4用于示意性地说明应用光扩散层对灯影现象的缓解;
图5示意性地示出了根据本发明的另一实施例的背光模组的截面图;
图6示意性地示出了根据本发明的另一实施例的背光模组的俯视图。
具体实施方式
下面,通过示例的方式来详细说明本发明的具体实施例。应当理解的是,本发明的实施例不局限于以下所列举的示例,本领域技术人员利用本发明的原理或精神可以对所示出的各实施例进行修改和变型,得到形式不同的其它实施例,显然,这些实施例都落入本发明要求保护的范围。
在本文中,除非特意声明,这里使用“一”、“一个”、“所述”和“该”修饰的技术特征并不排除相关的技术方案包括多个这样的技术特征。进一步地,本说明书中使用的措辞“包括”是指存在其后所列出的特征、元件或步骤,但是并不排除存在另外的特征、元件、步骤或它们的组合。而且,除非另外定义,这里使用的所有术语(包括技术术语和科学术语)具有与本公开所属领域中的普通技术人员的一般理解相同的意义。诸如通用字典中定义的那些术语,应该被理解为具有与本说明书的上下文中的意义一致的意义,并且除非在本文中被特定定义,否则不会用理想化或过于正式的含义来解释。
根据本发明实施例提供的背光模组包括基板、以及布置在基板上的多个微型LED。图1示出了根据本发明实施例的背光模组的示意性俯视图。如图1所示,背光模组的基板10上布置有多个微型LED (Mini LED或Micro LED)20a,所述多个微型LED包括微型LED阵列,所述微型LED阵列包括多个LED子阵列200,微型LED阵列中的各LED子阵列200的发光参数被独立地控制。能够理解到的是,基板10上可设置任何数量的LED子阵列,每个LED子阵列可包括任何数量的微型LED。
微型LED的尺寸相对于常规的LED要小得多,且具有较高的发光效率,应用微型LED的背光模组可以不设置导光板,这使得背光模组的整体厚度得以大大降低,从而也有利于应用该背光模组的显示装置的薄化,促进显示装置在不同场合下的应用。另外,在本发明的实施例中,背光模组中的微型LED阵列中的各个LED子阵列200的发光参数被独立控制,这意味着可以根据要显示的图像而对背光模组的基板上的不同区域的微型LED实行不同的控制方法或策略,即,所谓的“局部调光”,从而实现对要显示的画面的精细控制和调节,提升显示的图像的质量。由于微型LED相对于的常规LED的尺寸小,所以可以对显示区内的多个微型LED进行更加精细的分组,从而实施更加精细的“局部调光”。例如,本发明实施例提供的背光模组可以应用于机动车的仪表显示仪或者可显示各种不同画面的导航显示设备,从而减小这些仪表或显示设备的体积和尺寸,并提升显示画面的质量。
如上所述,根据本发明的实施例,背光模组中的每个LED子阵列可包括任何数量的微型LED。在本发明的一些实施例中,每个LED子阵列由M行微型LED和M列微型LED组成,M是大于等于2的整数。也就是说,每个LED子阵列大致形成一个正方形阵列,这有利于单个的LED子阵列所在区域的发光参数(例如,发光亮度)的均一性,同时也便于背光模组内的导线布局。
本申请的发明人在实践中意识到,影响显示装置的图像质量的一个不利因素是“灯影”问题。图2用于示意性地说明“灯影”现象。单个的LED通常朝某一方向在某一范围内投射光,在图2中,用箭头示意性地示出了单个的LED的最大的发光范围。在图2的示例中,单个LED发出的光束大致呈锥体。由于各个LED之间是彼此间隔的,单个LED的发光面积(这里的发光面积指的是当LED发光时,用户透过LED上方的层结构观察到的以LED为中心的具有明显的亮度的发光区域的面积)是有限的,当背光模组运行时,从用户的视觉效果上看,相邻的LED之间可能会存在一个暗区,即,相邻的LED之间会存在一个光照盲区S,该光照盲区S对用户的视觉效果而言就是“灯影”。减轻灯影现象的一个措施是增加背光模组中LED的密度,LED布置得越密集,光照盲区S的尺寸就越小,灯影现象就越不严重甚至得以消除。然而,相邻LED之间的距离过近会造成散热效率低,增加整体功耗,降低LED的发光效率。另外,过于密集的LED还会导致基板表面的反射层101面积相应地减小,从而不利于光的利用效率。减轻灯影现象的另一措施是增加显示面板与背光模组之间的距离,特别地,如图2所示,显示面板与基板上的LED的上表面之间的距离至少要大于图2中所示的竖直距离D,即显示面板要布置在LED的上方,并且显示面板与LED的上表面之间至少要间隔竖直距离D。然而,对于这样的解决方案,会导致显示装置的整体厚度增加,不利于减小显示装置的体积。
鉴于上述对与灯影问题相关的技术认知,发明人在本发明实施例提供的背光模组中布置光扩散层,以有效地消除灯影现象,同时有利于背光模组的薄化。因此,在本发明的一些实施例中,背光模组包括位于微型LED上方的光扩散层。光扩散层具有对光进行扩散的作用,增加单个的微型LED的发光面积,并能增强发出的光的均匀性。光扩散层可以直接布置在微型LED上,即光扩散层可以与微型LED接触,以有利于降低背光模组的整体厚度。在另外的实施例中,光扩散层与微型LED之间可以间隔有另外的适当的层结构。由于光扩散层的存在,实际上扩大了的单个LED的发光面积。可以设置光扩散层使得相邻的微型LED的光照区域存在重叠,从而大大地缓解甚至消除上述的灯影现象。在一些实施例中,光扩散层的厚度比前述的竖直距离D小得多,这样可以有效地减轻灯影现象,同时有利于背光模组的薄化。
根据本发明的实施例,背光模组中的光扩散层包括位于微型LED上方、与微型LED接触的两层光扩散膜,例如,图3中所示的光扩散膜30a、30b。光扩散膜可以使得从LED发出的光扩散,从而对从各个LED发出的光进行均匀地混合。在微型LED上方布置两层扩散膜,可以实现光的扩散和均匀化的效果,有效地缓解或消除灯影现象,并且不会过度降低背光模组的发光亮度,从而改进显示装置显示图像的质量。图3示意性地示出了设置光扩散膜30a、30b之后从两个LED发出的光的扩散现象,图4示意性地示出了处于发光状态的微型LED在不设置光扩散层和设置光扩散层两种情境下的俯视图。图4中直径较小的圆A1表示在不设置光扩散层的情况下的微型LED的发光面积,此时,用户能明显感知到相邻的LED之间的发光区域之间存在间隔,这样的间隔在用户的视觉夏效果上为相邻的LED之间的明显暗区,即上述的灯影现象。图4中的直径较大的圆A2表示在设置光扩散层的情况下微型LED的发光面积,即,单个的LED的发光面积得以扩大,这时,相邻的微型LED的发光区域彼此重叠,此时,灯影现象可以得到明显的缓解。
图5示意性地示出了根据本发明的另一实施例的背光模组的结构图。如图5所示,背光模组包括基板10、设置在基板上的多个微型LED 20a、位于微型LDE上的光扩散层30、处于光扩散层30上方的光转换层40、以及光转换层40上方的光汇聚元件50和增亮薄膜60,光转换层40包括量子点材料。光转换层中的量子点材料可以将源自于微型LED的光转换为期望颜色的光(例如,白光)。在一些实施例中,前述的微型LED包括未封装的可发出蓝光的微型LED芯片,从微型LED发出的蓝光可经由光转换层转换为白光,从而为显示面板提供合适的背光。光汇聚元件50可以使得从光转换层40发出的光成为准直光或汇聚光,增亮薄膜60可以增强背光模组所提供的背光的亮度。本发明实施例提供的背光模组不设置导光板,降低了背光模组的厚度,同时,上述的光扩散层、光转换层、光汇聚元件和增亮薄膜可以使得背光模组提供良好的背光,同时,灯影现象可以得到明显的减缓。在另外的实施例中,基板10是柔性基板,从而可以实施柔性显示模组。在图5的示例中,背光模组还包括背板70,从而为背光模组的上述各个结构提供支撑和保护。另外,虽然图5示意性地示出了背光模组的各个元件的示例,但是,这些元件的布置次序并不局限于图5。例如,光转换层40可以处于光扩散层30的下方,增亮薄膜60、光汇聚元件50的布置次序可以互换,在不影响提供背光功能的情况下,本领域技术人员可以对它们的层叠次序进行任何合适的调整。根据本公开的实施例,在基板10的表面上未由微型LED占据的区域,可以布置光反射材料,使得照射到基板10的表面的光由反射材料反射到光扩散层,从而提升光的利用效率。另外,虽然图5中示出了光扩散层30与微型LED接触,但是,在其它的实施例中,微型LED与光扩散层30之间可以存在任何适当的结构,例如,散热或隔热层等。
本发明实施例提供的背光模组可以应用于多种场景。下面,通过具体的示例来进一步说明本发明实施例提供的背光模组的应用。
根据本发明的一个实施例,背光模组应用于汽车的仪表显示器,并采用局部调光策略对背光模组的发光器件--微型LED进行控制。由于采用局部调光方法,因此,需要将处于基板的显示区的多个微型LED分成多个为上文中提到的LED子阵列,每个LED子阵列的发光参数可被独立控制。每个LED子阵列所在区域也对应于显示面板的一个子显示区域。可以基于人眼的分辨率极限来确定子显示区域的大小。根据瑞利判据,可以得到汽车的仪表显示屏上可由人眼分辨的图像区域的最小尺寸为:△y=N*△Q=N*1.22*λ*D,其中N为驾驶员眼睛到仪表显示屏的距离,λ为人眼最敏感的光的波长,D为人眼的瞳孔直径。人眼的瞳孔直径D的范围大致在2mm~9mm。在一个示例中,瞳孔直径D可以取值5mm,λ为5500埃,驾驶员眼睛到仪表盘的距离N为50cm。此时,通过以上公式,可以得到人眼可分辨的图像区域的最小尺寸约为1.67mm。相应地,显示模组中单个LED子阵列的区域的最小尺寸可以为大约1.67mm。因此,在本发明的一个实施例中,每个LED子阵列所占据区域的长度和宽度均大于等于1.67mm。由于人眼的瞳孔直径D的范围大致在2mm~9mm,相应地,显示模组中单个LED子阵列的区域的最小尺寸可以在0.67mm至3.0mm之间。
如图6所示,显示模组的显示区域的长度和宽度分别为A和B,单个的LED子阵列所在区域200的长度和宽度分别为L和H,L和H均大于等于1.67mm。在本发明的一个实施例中,背光模组的基板的显示区的尺寸为292.302*109.512 mm,因此,在显示区的长度方向上,最多可以划分得到175个LDE子阵列区域,在显示区的宽度方向上,最多可以划分得到65个LED子阵列区域。
在本发明的一个实施例中,结合显示面板的像素分辨率来考虑背光模组中的LED子阵列区域的数目,以实现更精确的局部调光。若显示面板的像素分辨率为P*Q,将背光模组的基板的显示区分成C*D个子显示区(即,LED子阵列区域),C表示沿显示区的长度方向的每行子显示区中子显示区的数目,D表示沿所述显示区的宽度方向的每列子显示区中子显示区的数目,且C和D分别是能够由P和Q整除的整数。在一个示例中,若显示面板的像素分辨率为1920*720,则C可以是能够由1920整除的整数,例如,192、160、120、96、80……,D可以是能够由720整除的整数,例如,72、60、48、45、40、36……。为了有益于各个LED子阵列所在区域的发光参数的均一性,并便于背光模组内的导线布局,可以尽量使得每个子显示区接近正方形,这样可以在每个子显示区内布置方形的LED子阵列。 C和D的数值越大,越有利于显示画面的精细控制,但是,这也需要更多数目的控制芯片,导致成本上升和散热问题。根据本发明的一个实施例,背光模组的基板的显示区的尺寸为292.302*109.512 mm,上述的参数C取值为40,参数D取值为15,即背光模组的多个微型LED被分成600个LED子阵列,单个LED子阵列所占区域的长度和宽度均大约为7.3mm。进一步地,在该实施例中,每个LED子阵列包括5行微型LED和5列微型LED,即每个LED子阵列包括25个微型LED,以实现合适密度的LED布置,有利于背光模组的散热,并减轻灯影现象。
本公开的另外的实施例提供了一种显示装置,包括如前述的任一实施例的背光模组和处于所述背光模组的出光侧的显示面板。
如前所述,根据本发明的实施例,背光模组的基板包括显示区,所述显示区包括C*D个子显示区,所述背光模组的各个LED子阵列分别布置在所述C*D个子显示区内,其中C表示沿所述显示区的长度方向的每行子显示区中子显示区的数目,D表示沿所述显示区的宽度方向的每列子显示区中子显示区的数目,若显示装置的显示面板的像素分辨率为P*Q,则C和D分别是能够由P和Q整除的整数。
本发明实施例提供的显示装置可以是车载仪表显示器。如之前所讨论的,可以采用局部调光策略对背光模组的微型LED进行控制。考虑到人眼的极限分辨能力,显示模组中单个LED子阵列的区域的最小尺寸可以大约为1.67mm。因此,若背光模组的基板的长度和宽度分别为L毫米和W毫米,则上述的参数C小于L/1.67,参数D小于W/1.67。
以上具体描述了本发明的一些示例性实施例,但是本领域技术人员在实践所要求保护的发明时根据对附图、公开内容已经权利要求的研究,能够理解和实现所公开实施例的其他变型。在权利要求中,词语“包括”不排除其它元件的存在。虽然一些特征被记载在不同的从属权利要求中,但是本发明也意图涵盖将这些特征组合在一起的实施例。
Claims (10)
1.一种背光模组,其特征在于,所述背光模组包括基板、以及布置在基板上的多个微型LED,所述多个微型LED包括微型LED阵列,所述微型LED阵列包括多个LED子阵列,所述微型LED阵列中的各LED子阵列的发光参数被独立地控制。
2.根据权利要求1中所述的背光模组,其特征在于,每个LED子阵列由M行微型LED和M列微型LED组成,M是大于等于2的整数。
3.根据权利要求1所述的背光模组,其特征在于,所述背光模组包括位于所述微型LED阵列上方的光扩散层,所述光扩散层与所述微型LED直接接触。
4.根据权利要求3所述的背光模组,其特征在于,所述光扩散层包括至少两层光扩散膜。
5.根据权利要求3所述的背光模组,其特征在于,所述背光模组还包括处于所述光扩散层上方的光转换层、处于所述光转换层上方的光汇聚元件和增亮薄膜,其中所述光转换层包括量子点材料。
6.根据权利要求1所述的背光模组,其特征在于,所述多个LED子阵列中的每个LED子阵列所占据区域的长度和宽度中的每个的最小值在0.67mm和3mm之间。
7.根据权利要求1所述的背光模组,其特征在于,所述微型LED包括未封装的发蓝光的微型LED芯片,所述基板是柔性基板。
8.一种显示装置,包括如权利要求1-7中任一项所述的背光模组、以及处于所述背光模组的出光侧的显示面板。
9.如权利要求8所述的显示装置,其特征在于,所述显示面板的像素分辨率为P*Q,所述背光模组的基板包括显示区,所述显示区包括C*D个子显示区,所述背光模组的各个LED子阵列分别布置在所述C*D个子显示区内,其中C表示沿所述显示区的长度方向的每行子显示区中子显示区的数目,D表示沿所述显示区的宽度方向的每列子显示区中子显示区的数目,且C和D分别是能够由P和Q整除的整数。
10.根据权利要求9所述的显示装置,所述基板的显示区的长度和宽度分别为L毫米和W毫米,其中参数C小于L/1.67,D小于W/1.67。
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KR100755615B1 (ko) * | 2006-04-14 | 2007-09-06 | 삼성전기주식회사 | 발광 다이오드를 이용한 액정 표시 장치의 백라이트 |
US10459289B2 (en) * | 2016-11-02 | 2019-10-29 | Innolux Corporation | Display device |
JP6289718B1 (ja) * | 2017-01-02 | 2018-03-07 | ルーメンス カンパニー リミテッド | Ledディスプレイ装置 |
CN106896577A (zh) * | 2017-03-27 | 2017-06-27 | 武汉华星光电技术有限公司 | 透反射式液晶显示器 |
CN207020427U (zh) * | 2017-08-04 | 2018-02-16 | 纳晶科技股份有限公司 | 背光单元及包括其的显示装置 |
US10957820B2 (en) * | 2017-12-21 | 2021-03-23 | Lumileds Llc | Monolithic, segmented light emitting diode array |
CN207799288U (zh) * | 2018-01-12 | 2018-08-31 | 安徽芯瑞达科技股份有限公司 | 一种高色域直下式背光模组 |
CN108490683A (zh) * | 2018-03-12 | 2018-09-04 | 安徽芯瑞达科技股份有限公司 | 一种新型背光模组用背光源及其制备方法 |
CN109116626B (zh) * | 2018-09-04 | 2021-08-10 | 京东方科技集团股份有限公司 | 一种背光源及其制作方法、显示装置 |
TWI660018B (zh) * | 2018-10-19 | 2019-05-21 | 住華科技股份有限公司 | 背光模組及應用其之面板及其之製造方法 |
CN109459886B (zh) * | 2018-10-31 | 2021-11-02 | 厦门天马微电子有限公司 | 一种背光模组、制作方法及显示装置 |
CN210573097U (zh) * | 2019-07-08 | 2020-05-19 | 京东方科技集团股份有限公司 | 背光模组及包含该背光模组的显示装置 |
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2019
- 2019-07-08 CN CN201910610786.1A patent/CN112198708A/zh active Pending
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2020
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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TWI783875B (zh) * | 2022-02-18 | 2022-11-11 | 友達光電股份有限公司 | 顯示面板 |
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WO2021004347A1 (zh) | 2021-01-14 |
US20210200028A1 (en) | 2021-07-01 |
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