CN110757957A - 一种oled喷墨打印方法及装置 - Google Patents
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Abstract
本发明公开了一种OLED喷墨打印方法及装置,方法包括在单排布置并沿直线往复移动的多个喷头给OLED基板喷墨时,通过激光扫描来检测喷头主喷嘴的墨滴是否正常滴下,并通过喷头的补喷喷嘴对OLED基板上漏喷、少喷的部分进行即时补喷。装置包括放置平台、滑动座、导轨和驱动机构,滑动座上设有多个喷头,喷头位于放置平台的上方;每个喷头上均连接有位于前道的主喷嘴和位于后道的补喷喷嘴;还包括激光扫描装置,激光扫描装置和喷头均与控制装置连接。本发明提供的一种OLED喷墨打印方法及装置,其能喷印大型OLED面板,既能准确提高被喷液滴落点使其达到±0.5um的定位精度,又能使OLED面板的喷印合格率达到97%以上。
Description
技术领域
本发明涉及OLED喷印技术领域,尤其涉及一种OLED喷墨打印方法及装置。
背景技术
OLED喷印技术主要是使用溶剂将OLED有机材料融化,然后将材料直接喷印在基板表面形成R(红)、G(绿)、B(蓝)有机发光层。OLED喷印设备从喷头的布置和移动方式可分为两类:单pass和多pass。其中,单pass喷印设备指多个喷头沿X轴排成一排,并同时沿Y轴移动。然而,由于目前无法很好解决单pass喷印设备喷头的漏喷问题,经过其喷印后的OLED板的合格率只有70%左右,合格率较低。因此,单pass喷印设备的推广度较低。而多pass喷印设备指单个喷头沿X、Y轴移动来打印,虽然其漏喷率较低,合格率高,推广度高,但其喷头数量少,喷印效率过低。
目前已公开的专利文件CN108068462A(一种喷墨打印装置和喷墨打印方式)中,公开了通过拍摄的墨滴图像来判断喷头是否出现堵塞的情况。然而,通过图像方式来检测,由于OLED喷印时其墨滴体积很小,不仅对摄像头的分辨率要求极高,其需要处理的数据量也极大,对处理器的处理能力要求很苛刻,信息处理时间长,导致在判断喷头是否堵塞时,需要减慢喷印速度来配合,喷印速度将受到极大的限制。
发明内容
本发明的目的是提供一种OLED喷墨打印方法及装置,既能准确提高被喷液滴落点使其达到±0.5um的定位精度,又能使OLED面板的喷印合格率达到97%以上。
为实现上述目的,本发明提供一种OLED喷墨打印方法,在单排布置并沿直线往复移动的多个喷头给OLED基板喷墨时,通过激光扫描来检测位于喷头上的主喷嘴的墨滴是否正常滴下,并通过喷头上的补喷喷嘴对OLED基板上漏喷、少喷的部分进行即时补喷。
作为本发明的更进一步改进,在进行所述激光扫描时,照射在墨滴上的激光方向与墨滴的滴落方向相垂直。
作为本发明的更进一步改进,在进行所述激光扫描时,激光的排列方向与各主喷嘴排列方向相对应,激光的照射高度与主喷嘴上处于滴落初期的墨滴相对应。
作为本发明的更进一步改进,所述激光的激光发射端和接收端随单排的喷头同步移动。
作为本发明的更进一步改进,补喷喷嘴的排列方向与主喷嘴排列方向相平行,一排补喷喷嘴的数量与一排主喷嘴数量相同。
为实现上述目的,本发明还提供一种OLED喷墨打印装置,包括OLED基板的放置平台以及两者滑动连接的滑动座和导轨,滑动座连接有驱动机构,所述滑动座上设有单排布置的多个喷头,所述喷头位于放置平台的上方;每个喷头上均连接有位于前道的主喷嘴和位于后道的补喷喷嘴;还包括主喷嘴墨滴的激光扫描装置,所述激光扫描装置和喷头均与控制装置连接。
作为本发明的更进一步改进,所述激光扫描装置的数量与主喷嘴相同;各激光扫描装置排成单列并与各主喷嘴一一对应。
作为本发明的更进一步改进,所述激光扫描装置通过支架与所述滑动座连接。
作为本发明的更进一步改进,所述激光扫描装置包括沿光路依次设置的激光发射接收器和反射镜;所述激光发射接收器和反射镜固定连接;激光发射接收器的激光发射端朝下;反射镜位于激光发射接收器的激光发射端下方并相对其倾斜布置。
作为本发明的更进一步改进,所述滑动座上设有与所述导轨滑动套接的第一滑块,所述第一滑块依次连接有供气管和气泵;第一滑块上设有朝导轨喷气的气嘴。
有益效果
与现有技术相比,本发明的一种OLED喷墨打印方法及装置的优点为:
1、其采用单pass的打印喷头,即通过将多个喷头排成单排并沿直线往复移动的方式对OLED基板进行喷印,同时以激光扫描来判断喷头上位于前道的主喷嘴的墨滴是否滴下,对漏喷、少喷的部位,通过位于喷头后道上的补喷喷嘴进行即时补喷。由于通过激光检测墨滴时,靠激光遇到墨滴后反射获得激光往返的时间,只需要将激光实际往返时间与有墨滴时的激光往返时间进行对比,即可判断是否出现主喷嘴漏喷、少喷的情况,其所需要处理的数据少。控制板卡在很短时间内就能获得结果并反馈到补喷喷嘴进行补喷,其喷印效率高,既能准确提高被喷液滴落点使其达到±0.5um的定位精度,又能使OLED面板的喷印合格率达到97%以上,相对于目前只通过主喷嘴喷印的设备,其合格率提高了约39%。
2、照射在墨滴上的激光方向与墨滴的滴落方向相垂直,计算更方便。
3、激光的照射高度与主喷嘴上处于滴落初期的墨滴相对应,此时墨滴的速度较慢,更容易被激光扫描到,尽可能避免漏检现象的发生。
4、激光扫描装置随滑动座共同移动,即两者相对静止,距离固定,则激光扫描时计算所需的变量少,计算难度低,方便信息的处理,能尽快获得判断结果,以确保喷印OLED基板时无需减缓喷头移动速度以配合检测。
5、喷头的喷嘴在打印时,喷嘴与OLED基板两者间距很小。若激光发射接收器的激光发射端直接水平设置,为防止激光发射接收器与OLED基板相互干涉,必须对激光发射接收器进行小型化,或拉大喷嘴与OLED基板两者的间距。由于激光发射接收器结构复杂,难以小型化;而拉大喷嘴与OLED基板两者的间距会造成打印不清晰。为此,使激光发射接收器的激光发射端朝下并通过反射镜转向形成水平激光,结构简单,不仅无需对激光发射接收器进行小型化设计,降低设计成本,而且也无需拉大喷嘴与OLED基板两者的间距,确保打印清晰。使用时,只需让反射镜靠近下边缘处用于激光的反射即可。
通过以下的描述并结合附图,本发明将变得更加清晰,这些附图用于解释本发明的实施例。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为实施例1中OLED喷墨打印装置的立体图;
图2为实施例1中主喷嘴上墨滴滴落时激光光路的示意图;
图3为实施例1中的控制示意图;
图4为实施例1中第一滑块的剖面图;
图5为实施例2中主喷嘴上墨滴滴落时激光光路的示意图。
具体实施方式
现在参考附图描述本发明的实施例。
实施例1
本发明的具体实施方式如图1-4所示,一种OLED喷墨打印方法,在单排布置并沿直线往复移动的多个喷头3给OLED基板9喷墨时,通过激光扫描来检测位于喷头3上的主喷嘴4的墨滴9是否正常滴下,并通过喷头3上的补喷喷嘴5对OLED基板9上漏喷、少喷的部分进行即时补喷。
在进行激光扫描时,照射在墨滴9上的激光方向与墨滴9的滴落方向相垂直。激光的排列方向与各主喷嘴4排列方向相对应,激光的照射高度与主喷嘴4上处于滴落初期的墨滴9相对应。激光的激光发射端和接收端随单排的喷头3同步移动。补喷喷嘴5的排列方向与主喷嘴4排列方向相平行,一排补喷喷嘴5的数量与一排主喷嘴4数量相同。
本实施例提供一种OLED喷墨打印装置,包括放置OLED基板9的放置平台11以及滑动连接的滑动座2和导轨1,滑动座2连接有驱动机构7。驱动机构7为气缸或直线电机。导轨1的延伸方向与喷头3的排列方向相垂直,导轨1的数量为两条并分别位于放置平台11的两侧。滑动座2上设有单排布置的多个喷头3,每个喷头3上均设有位于前道的主喷嘴4和位于后道的补喷喷嘴5。该OLED喷墨打印装置还包括能检测主喷嘴4的墨滴9是否正常滴下的激光扫描装置6。激光扫描装置6和喷头3均与控制装置10连接。本实施例中,控制装置10为控制板卡。本实施例中,每个喷头3上设有一个位于前道的主喷嘴4和一个位于后道的补喷喷嘴5。喷头3的排列方向与滑动座2的移动方向相垂直。
激光扫描装置6的数量与主喷嘴4相同。各激光扫描装置6排成单列并与各主喷嘴4一一对应。激光扫描装置6与滑动座2通过高度调节机构8连接。高度调节机构8包括两端与滑动座2固定连接的竖直导轨81,竖直导轨81上滑动连接有第二滑块82。第二滑块82与激光扫描装置6固定连接。高度调节机构8还包括与竖直导轨81平行布置的螺杆83,螺杆83一端连接有手轮84。螺杆83与滑动座2旋转连接,螺杆83与第二滑块82螺纹连接。通过转动手轮84可让激光扫描装置6上下移动,以选择最适合扫描主喷嘴4墨滴的高度。
将主喷嘴4设置在补喷喷嘴5和激光扫描装置6之间,则激光检测时,激光不会被从补喷喷嘴5上滴落的墨滴9干扰,确保判断主喷嘴漏喷与否的精确性。
本实施例中,滑动座2的两端设有与导轨1滑动套接的第一滑块21,第一滑块21依次连接有供气管13和气泵12。第一滑块21上设有朝导轨1喷气的气嘴213。第一滑块21包括两者边缘相连接的外套体211和内套体212,气嘴213设置在内套体212的各个侧壁上。外套体211和内套体212侧壁间隙配合并构成气腔214,供气管13与气腔214连通。内套体212的内侧构成与导轨1间隙配合的通道215。使用时,气泵12通过供气管13向第一滑块21的气腔214内输送惰性气体(例如氮气),使气嘴213持续朝导轨1的侧壁喷气,利于反作用力让第一滑块21与导轨1之间形成气膜,第一滑块21与导轨1不接触,实现气浮。当第一滑块21沿导轨1移动时,两者之间不存在摩擦力,磨损小,而且没有震动,移动更稳定,从而提高喷印效果。此外,第一滑块21与导轨1也可以不采用气浮形式。第一滑块21与导轨1相互套接,第一滑块21内连接有与导轨1滚动接触的滚轮。
本实施例中,激光扫描装置6包括激光发射接收器61,激光发射端和激光接收端均设置在激光发射接收器61上且两者相邻布置。激光发射接收器61的激光发射端水平布置。
在使用该OLED喷墨打印装置进行OLED基板9的喷印时,滑动座2和激光扫描装置6两者在驱动机构7的作用下沿导轨1从右往左移动,滑动座2上一排喷头3上的主喷嘴4根据实际喷印图案开始在OLED基板9上喷墨,一排布置的激光扫描装置6通过激光对主喷嘴4的喷液情况进行即时监测,若主喷嘴4正常滴下,处于下落初始状态的墨滴被激光发射接收器61激光发射端发射的激光照射到,激光反射并被激光发射接收器61的接收端接收。控制装置10实时监测发射接收器61的接收端情况,若激光发射出去后未被主喷嘴4的墨滴反射,则发射接收器61的接收端的信号异常,控制装置10判定为主喷嘴4有漏喷或少喷的情况。当检测到主喷嘴4有漏喷、少喷的情况时,控制装置10使位于该主喷嘴4后方的补喷喷嘴5在移动到漏喷、少喷的部位时进行补喷。其可喷印OLED基板9的幅面长度≥1000mm、宽度≥1000mm,并且既能准确提高被喷液滴落点使其达到±0.5um的定位精度,又能使OLED面板的喷印合格率达到97%以上,此外还发挥了单pass的OLED喷印设备的喷印速度优势。
实施例2
如图5所示,与实施例1的不同之处在于,激光扫描装置6包括沿光路依次设置的激光发射接收器61和反射镜62。激光发射接收器61和反射镜62固定连接。激光发射接收器61的激光发射端朝下。反射镜62位于激光发射接收器61的激光发射端下方并相对其倾斜布置。本实施例中,激光发射接收器61的激光发射端竖直朝下,反射镜62相对于水平面的倾斜角为45°。经反射镜62反射后的激光沿水平方向照射。
除上述实施例外,主喷嘴4和补喷喷嘴5也可以分别设置在两个不同的喷头3上。
以上结合最佳实施例对本发明进行了描述,但本发明并不局限于以上揭示的实施例,而应当涵盖各种根据本发明的本质进行的修改、等效组合。
Claims (10)
1.一种OLED喷墨打印方法,其特征在于,在单排布置并沿直线往复移动的多个喷头(3)给OLED基板(9)喷墨时,通过激光扫描来检测位于喷头(3)上的主喷嘴(4)的墨滴是否正常滴下,并通过喷头(3)上的补喷喷嘴(5)对OLED基板(9)上漏喷、少喷的部分进行即时补喷。
2.根据权利要求1所述的一种OLED喷墨打印方法,其特征在于,在进行所述激光扫描时,照射在墨滴上的激光方向与墨滴的滴落方向相垂直。
3.根据权利要求2所述的一种OLED喷墨打印方法,其特征在于,在进行所述激光扫描时,激光的排列方向与各主喷嘴(4)排列方向相对应,激光的照射高度与主喷嘴(4)上处于滴落初始位置的墨滴相对应。
4.根据权利要求3所述的一种OLED喷墨打印方法,其特征在于,所述激光的激光发射端和接收端随单排的喷头(3)同步移动。
5.根据权利要求1至4任意一项所述的一种OLED喷墨打印方法,其特征在于,补喷喷嘴(5)的排列方向与主喷嘴(4)排列方向相平行,一排补喷喷嘴(5)的数量与一排主喷嘴(4)数量相同。
6.根据权利要求1所述的一种OLED喷墨打印装置,包括OLED基板(9)的放置平台(11)以及滑动连接的滑动座(2)和导轨(1),滑动座(2)连接有驱动机构(7),其特征在于,所述滑动座(2)上设有单排布置的多个喷头(3),所述喷头(3)位于放置平台(11)的上方;每个喷头(3)上均连接有位于前道的主喷嘴(4)和位于后道的补喷喷嘴(5);还包括主喷嘴(4)墨滴的激光扫描装置(6),所述激光扫描装置(6)和喷头(3)均与控制装置(10)连接。
7.根据权利要求6所述的一种OLED喷墨打印装置,其特征在于,所述激光扫描装置(6)的数量与主喷嘴(4)相同;各激光扫描装置(6)排成单列并与各主喷嘴(4)一一对应。
8.根据权利要求7所述的一种OLED喷墨打印装置,其特征在于,所述激光扫描装置(6)与所述滑动座(2)连接。
9.根据权利要求8所述的一种OLED喷墨打印装置,其特征在于,所述激光扫描装置(6)包括沿光路依次设置的激光发射接收器(61)和反射镜(62);所述激光发射接收器(61)和反射镜(62)固定连接;激光发射接收器(61)的激光发射端朝下;反射镜(62)位于激光发射接收器(61)的激光发射端下方并相对其倾斜布置。
10.根据权利要求6或7或8或9所述的一种OLED喷墨打印装置,其特征在于,所述滑动座(2)上设有与所述导轨(1)滑动套接的第一滑块(21),所述第一滑块(21)依次连接有供气管(13)和气泵(12);第一滑块(21)上设有朝导轨(1)喷气的气嘴(213)。
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