CN111987081A - 一种led显示模组的防串光格栅的成型方法及塑封模 - Google Patents
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Abstract
本发明属于芯片封装技术领域,具体公开了一种LED显示模组的防串光格栅的成型方法,包括以下步骤:S1、将上芯焊线后半成品放置在塑封模中,上芯焊线后半成品带有芯片的一侧与塑封模形成填充型腔,在填充型腔中注塑塑封料;S2、然后脱模,在上芯焊线后半成品的表面由塑封料形成防串光格栅,得到塑封半成品。塑封时,塑封料通过塑封模具型腔结构,直接形成防串光格栅,降低切割防串光格栅的成本,提升效率。去掉切割防串光格栅工艺,避免切割防串光格栅对塑封体造成的切割应力,提高产品可靠性。本发明还公开了一种用于成型所述LED显示模组的防串光格栅的塑封模,根据LED显示模组所需要的防串光格栅结构进行设计,结构简单,方便加工出防串光格栅。
Description
技术领域
本发明涉及芯片封装技术领域,特别涉及一种LED显示模组的防串光格栅的成型方法及塑封模。
背景技术
随着全彩LED显示行业的发展,全彩LED显示屏逐渐向分辨率高,像素点间距小技术拓展,单位面积上的LED灯珠数量增加,使得贴片和维修难度增加,单颗LED灯珠可靠性要求提升。为了降低贴片和维修难度,提高可靠性,多合一LED灯珠应用而生。然而多合一LED灯珠在加工过程,为了避免像素点之间的光干涉,需要在像素点之间制造格栅,避免多合一LED灯珠内部光线相互干涉,造成色彩真实度与亮度差异。目前多合一LED灯珠格栅工艺,普遍为切割成型,增加了切割防串光格栅的成本,降低了效率;切割防串光格栅时对塑封体造成切割应力,降低产品可靠性。
发明内容
本发明的目的之一在于提供一种LED显示模组的防串光格栅的成型方法,去掉了通过切割加工防串光格栅的工艺,避免切割防串光格栅对塑封体造成的切割应力,提高产品可靠性。
本发明的目的之二在于提供一种用于实现所述LED显示模组的防串光格栅的成型方法的塑封模,根据LED显示模组所需要的防串光格栅结构进行设计,结构简单,方便加工出防串光格栅。
本发明是通过以下技术方案来实现:
一种LED显示模组的防串光格栅的成型方法,包括以下步骤:
S1、将上芯焊线后半成品放置在塑封模中,上芯焊线后半成品带有芯片的一侧与塑封模形成填充型腔,在填充型腔中注塑塑封料;
S2、然后脱模,在上芯焊线后半成品的表面由塑封料形成交叉布设的凸起和凹槽,凸起作为像素点,凹槽为防串光格栅,得到具有防串光格栅的塑封半成品。
进一步,在步骤S1之前,制备所述上芯焊线后半成品的方法为:
将芯片通过固晶胶固定在基板或引线框架上,通过键合线将芯片与基板或引线框架进行电性连接。
进一步,在步骤S2之后,将塑封半成品切割成多个切割后半成品,将切割后半成品进行脱膜分离后形成多个LED显示模组。
进一步,沿X方向和Y方向均切割。
进一步,每个LED显示模组上有n*m个像素点,其中n≥2、m≥2。
进一步,凹槽为U型,起模斜度为6°~20°。
进一步,防串光格栅的表面粗糙度为Ra1.5-2.5μm。
本发明还公开了一种实现所述的LED显示模组的防串光格栅的成型方法的塑封模,所述塑封模包括塑封上模和塑封下模,塑封下模的上表面上设有多个凸块,相邻凸块之间形成凹槽;凸块的位置和形状与防串光格栅相匹配;
成型时,上芯焊线后半成品放置在塑封上模和塑封下模中间,上芯焊线后半成品带有芯片的一侧与塑封下模形成填充型腔,塑封上模设置在远离上芯焊线后半成品带有芯片的另一型。
进一步,凸块为倒U形,凸块的起模斜度为6°~20°。
进一步,塑封下模的上表面粗糙度为Ra1.5-2.5μm。
与现有技术相比,本发明具有以下有益的技术效果:
本发明公开了一种LED显示模组的防串光格栅的成型方法,通过注塑直接形成防串光格栅,塑封时,塑封料通过塑封模具型腔结构,直接形成防串光格栅,降低切割防串光格栅的成本,提升效率。去掉切割防串光格栅工艺,避免切割成型防串光格栅对塑封体造成的切割应力,提高产品可靠性。
进一步,由于像素点之间的条形防串光格栅粗糙度为Ra1.5-2.5μm,防串光格栅与空气相接处的部分会使得光线发生折射与漫反射,最终从发光面正面射出,避免了LED显示模组内光线向侧面射出从而形成对临近像素点的干扰,造成色彩不真实的现象。
本发明还公开了一种用于成型所述LED显示模组的防串光格栅的塑封模,包括塑封上模和塑封下模,注塑成型时,将上芯焊线后半成品放置在塑封上模和塑封下模中间,进行注塑。塑封下模和防串光格栅的结构是相适应的,根据LED显示模组的像素点间距、格栅宽度、外观要求,进行凸块的设计。根据LED显示模组所需要的防串光格栅结构进行设计,结构简单,方便加工出防串光格栅。
附图说明
图1为本发明的上芯焊线后半成品的结构示意图;
图2为本发明的LED显示模组的防串光格栅塑封成型时的结构示意图;
图3为本发明的塑封半成品的结构示意图;
图4为本发明中切割塑封半成品时的结构示意图;
图5为本发明的LED显示模组的侧视结构示意图;
图6为本发明的LED显示模组的正视结构示意图。
其中,1为上芯焊线后半成品,11为基板,12为键合线,13为芯片;
2为像素点,3为防串光格栅;4为塑封上模,5为塑封下模,6为填充型腔,7为切割工具,8为切割道。
具体实施方式
下面结合具体的实施例对本发明做进一步的详细说明,所述是对本发明的解释而不是限定。
本发明公开了一种LED显示模组的防串光格栅的成型方法,包括以下步骤:
S1、如图2所示,将上芯焊线后半成品1放置在塑封模中,上芯焊线后半成品1带有芯片13的一侧与塑封模形成填充型腔6,在填充型腔6中注塑塑封料;
S2、然后脱模,在上芯焊线后半成品1的表面由塑封料形成交叉布设的凸起和凹槽,凸起作为像素点2,凹槽为防串光格栅3,得到如图3所示的塑封半成品。
如图1所示,上芯焊线后半成品1包括基板11和芯片13,芯片13通过键合线12焊接在基板11上。基板11也可以为引线框架。
在步骤S1之前,制备所述上芯焊线后半成品1的方法为:将芯片13通过固晶胶固定在基板11或引线框架上,通过键合线12将芯片13与基板11或引线框架进行电性连接,得到上芯焊线后半成品1。
如图4所示,在步骤S2之后,使用切割道8具沿着切割道8将塑封半成品切割成如图5所示的多个切割后半成品,将切割后半成品脱膜分离后形成多个LED显示模组。
如图6所示,每个LED显示模组上有n*m(n≥2、m≥2)个像素点。
一般地,切割时,沿X方向和Y方向均要切割。
注塑成模时,塑封料形成交叉布设的凸起和凹槽,凸起作为像素点2,凹槽为防串光格栅3,凹槽为U型,起模斜度为6°~20°。
防串光格栅3的表面粗糙度为Ra1.5-2.5μm。防串光格栅3与空气相接处的部分会使得光线发生折射与漫反射,最终从发光面正面射出,避免了LED显示模组内两像素点2光线向侧面射出发生串光,造成色彩不真实的现象。
如图2所示,本发明还公开了一种用于成型所述LED显示模组的防串光格栅3的塑封模,包括塑封上模4和塑封下模5,塑封下模5的上表面上设有多个凸块,相邻凸块之间形成凹槽;成型时,上芯焊线后半成品1放置在塑封上模4和塑封下模5中间,上芯焊线后半成品1带有芯片13的一侧与塑封下模5形成填充型腔6,塑封上模4设置在远离上芯焊线后半成品1带有芯片13的另一型。
本发明只是给出了LED显示模组的防串光格栅3的一种结构形式,根据LED显示模组的像素点2间距、格栅宽度、外观要求,进行凸块宽度、间距、粗糙度的设计。
更优地,凸块镶嵌在塑封下模5内,可根据防串光格栅3的位置进行变换移动。
凸块为倒U形,便于产品脱模;凸块的起模斜度设计为6°~20°,角度过大,影响整屏正面外观效果,影响整屏侧面光色一致性。
塑封下模5的上表面粗糙度为Ra1.5-2.5μm。
塑封时,塑封料通过塑封模具型腔结构,直接形成防串光格栅3,降低切割防串光格栅3的成本,提升效率。去掉切割防串光格栅3工艺,避免切割防串光格栅3对塑封体造成的切割应力,提高产品可靠性。由于像素点2之间的条形防串光格栅3表面存在一定的粗糙度,防串光格栅3与空气相接处的部分会使得光线发生折射与漫反射,最终从发光面正面射出,避免了LED显示模组内两像素点2光线向侧面射出发生串光,造成色彩不真实的现象。
Claims (10)
1.一种LED显示模组的防串光格栅的成型方法,其特征在于,包括以下步骤:
S1、将上芯焊线后半成品(1)放置在塑封模中,上芯焊线后半成品(1)带有芯片(13)的一侧与塑封模形成填充型腔(6),在填充型腔(6)中注塑塑封料;
S2、然后脱模,在上芯焊线后半成品(1)的表面由塑封料形成交叉布设的凸起和凹槽,凸起作为像素点(2),凹槽为防串光格栅(3),得到具有防串光格栅(3)的塑封半成品。
2.根据权利要求1所述的LED显示模组的防串光格栅的成型方法,其特征在于,在步骤S1之前,制备所述上芯焊线后半成品(1)的方法为:
将芯片(13)通过固晶胶固定在基板(11)或引线框架上,通过键合线(12)将芯片(13)与基板(11)或引线框架进行电性连接。
3.根据权利要求1所述的LED显示模组的防串光格栅的成型方法,其特征在于,在步骤S2之后,将塑封半成品切割成多个切割后半成品,将切割后半成品进行脱膜分离后形成多个LED显示模组。
4.根据权利要求3所述的LED显示模组的防串光格栅的成型方法,其特征在于,沿X方向和Y方向均切割。
5.根据权利要求3所述的LED显示模组的防串光格栅的成型方法,其特征在于,每个LED显示模组上有n*m个像素点(2),其中n≥2,m≥2。
6.根据权利要求1所述的LED显示模组的防串光格栅的成型方法,其特征在于,凹槽为U型,起模斜度为6°~20°。
7.根据权利要求1所述的LED显示模组的防串光格栅的成型方法,其特征在于,防串光格栅(3)的表面粗糙度为Ra1.5-2.5μm。
8.实现权利要求1~7任意一项所述的LED显示模组的防串光格栅的成型方法的塑封模,其特征在于,所述塑封模包括塑封上模(4)和塑封下模(5),塑封下模(5)的上表面上设有多个凸块,相邻凸块之间形成凹槽;凸块的位置和形状与防串光格栅(3)相匹配;
成型时,上芯焊线后半成品(1)放置在塑封上模(4)和塑封下模(5)中间,上芯焊线后半成品(1)带有芯片(13)的一侧与塑封下模(5)形成填充型腔(6),塑封上模(4)设置在远离上芯焊线后半成品(1)带有芯片(13)的另一型。
9.根据权利要求8所述的塑封模,其特征在于,凸块为倒U形,凸块的起模斜度为6°~20°。
10.根据权利要求8所述的塑封模,其特征在于,塑封下模(5)的上表面粗糙度为Ra1.5-2.5μm。
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