CN1190845A - 采用三维光学调制器的投影显示的彩色相位控制系统 - Google Patents
采用三维光学调制器的投影显示的彩色相位控制系统 Download PDFInfo
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Abstract
一种以SLM为基础的投射显示系统(10)对视频数据进行采样和处理后传送给三维光学调制器(SLM)(13c),并采用一个彩色转盘(14a)对SLM产生的图象作彩色处理。帧存贮器(13b)为SLM(13c)提供数据,通过对其管理,在进入的视频信号相位变化时,可以使彩色转盘位置和SLM(13c)可以获得的数据之间仍保持希望的相位关系。系统的马达控制单元(15a)使用一种水平同步信号产生彩色转盘马达(16a)的驱动信号,它可以限制相变事件中瞬态时间并还提供一种调节驱动信号相位的手段。
Description
本申请是1994年7月19日提交的,申请号为94116150.1的“采用三维光学调制器的投影显示的彩色相位控制系统”专利申请的分案申请。
本发明涉及一种图象显示系统,更具体地说涉及一种采用三维光学调制器、白色光源、彩色转盘的投射显示系统。
三维光学调制器(SLM)在投射显示应用领域的使用日益增加。DMD都是一种具有微型机械镜元件阵列的SLM,它的每一个镜元件是由电子数据寻址的。每一个镜元件根据其地址信号的状态进行运动,从而使光反射或不反射到图象平面上。
在以SLM为基础的显示应用中,输入的视频信号必须被转换成SLM可使用的二进制数据形式。当模拟信号向数字形式转换时数据是按照逐个象素,逐行和逐帧的次序进行的。若数据为隔行扫描时也可能需要进行从场到帧的扫描变换。例如:DMD的每一个镜元件在同一时刻只显示一个比特。换言之,任一时刻DMD反射的图象都代表具有相同二进制权重的一组比特。这样在传递到SLM以前,数据必须被重新组成"比特平面"。对于具有n比特分辨率的象素,每个图象帧有n个比特平面。
序号为07/678,761名称为"用于脉冲宽度调制显示系统的DMD的结构和时标控制"的美国专利,描述了一种以DMD为基础的投射显示系统。它同时还描述了一种利用这个系统重组视频信号的方法,和一种能提供可变强度的比特平面的调制方法。
彩色图象是由代表不同颜色的比特平面产生的。作为一个例子,电视画面的每个象素可能具有24比特的数据。假如颜色为红、绿、兰这24比特中8比特将是红色的数据,8比特为绿色数据,另外8比特为兰色数据。一帧完整的电视画面将包含24个比特平面的图象。
一种提供单色图象的技术是在SLM前面使用一个白光源和一个颜色滤光器。在一种这样的设计中,白光照亮SLM,颜色滤光器放置在SLM和图象平面之间,以使由SLM反射的图象被滤色而具有该种颜色。而在另一种设计中,颜色滤光器放置在白光源和SLM之间。
颜色滤光器普通的实现手段是使光瞬时地滤过用马达带动的具有红、兰和绿色部分的"彩色转盘"。当转盘转动时,红、绿或兰色的数据通过盘上相应的部分被透射过去。最后的图象颜色由每一种颜色的比特平面的数据决定。序号为07/809816名称为"强化白光的彩色场顺序投射"的美国专利描述了一种彩色转盘在以DMD为基础的投射显示系统中的使用情况。
在彩色转盘应用中,转速和彩色转盘的相位与由SLM反射的图象数据的时序必须同步。换言之,彩色转盘的转动透时数据必须保证在正确的时间通过正确的颜色。
使彩色转盘正确同步的困难在于从一种视频信号向另一种变化时通常会产生颜色相位的变化。即使新的数据和旧的数据频率相同,相位也会变化。例如:在电视系统中,观看者可能会改变频道,这样,在应当获得来自旧频道的处理过的红色数据时,SLM都可能获得来自新频道的处理过的兰色数据。结果,除非将数据和彩色转盘重新同步,否则当彩色转盘的红色部分在SLM前面时,SLM将可能出现兰色数据信息。
使彩色转盘和数据同步的已有技术是用高转矩马达驱动彩色转盘,它可以快速地使彩色转盘加速或减速来调节其相位。然而这种高转矩马达是十分昂贵的。
本发明的第一个方面是一个用于显示系统的存贮器,该显示系统采用一个SLM和一个马达驱动的彩色转盘,该转盘具有不相同的颜色滤光片,以便从处理过的视频数据中显示图象。存贮器存贮处理过的准备向SLM传递的数据。存贮器具有单独的可寻址部分,用来存贮DMD要显示的每一种颜色的数据,这样,从选定部分来的数据就可以在一个给定的瞬间从存贮器中读到。指针控制单元产生阅读指针,它代表存贮器中的一个地址,数据要从此处读出。指针控制单元决定存贮器的当时要阅读的部分,并响应于彩色转盘马达的反馈信号确定读数的时序,而马达的反馈信号指明所述的彩色转盘相对于SLM中的视频数据的相位。
存贮器的技术优点是使彩色转盘和显示同步。通过控制阅读指针可以解决彩色转盘和SLM得到的数据之间的相位差。这样对彩色转盘马达的要求仅仅是在单位时间内以固定旋转速率驱动彩色转盘,不再有加速或减速来解决相位差的要求。这样就有可能采用不昂贵的马达。此外,为达到同步的瞬态时间被减到最小。就电视应用来说,在频道变化后,SLM得到的数据被快速地与彩色转盘的位置重新同步。在电视以及其它应用中,快速重新同步可以减少图象令人不希望的人为干扰。
本发明的另一个方面是用于一种显示系统的彩色转盘马达控制单元,该显示系统采用一个马达驱动的彩色转盘,它从处理过的视频信号的采样数据中,显示多帧彩色图象。一个锁相振荡器接收视频信号的水平同步信号,并产生一个频率为所述水平同步信号与预定因子乘积的脉冲信号。一个第一n分频计数器接收从锁相振荡器来的脉冲信号,并且按照每帧扫描线的数目将比交错信号进行分频,这样就产生一个帧脉冲信号,其频率等于帧长度与预定因子的乘积。一个第二n分频计数器接收帧脉冲信号,并借助预定的分频器将比信号分频,这样就产生一个周期等于帧长的方波。这个信号可以用来驱动彩色转盘的同步交流马达。
相位变化,例如使用电视机时改换频道会引起马达驱动信号的中断,使用水平同步信号驱动彩色转盘的同步马达可缩短马达驱动信号的中断时间,这是因为水平同步脉冲间的中断比垂直同步脉冲之间的中断要小得多,并且还因为在水平重新同步期间锁相振荡器/分频器可以保持马达驱动波的波形。它还允许对彩色转盘的相位进行较大的调节,这样使各种最大限度使用存贮空间的存贮管理技术可能得以采用。以下对附图作一简要说明。
图1是一种按照本发明提出的以SLM为基础的投射显示系统的基本方块图,它既有帧存贮器又有马达控制单元。
图2表明了图1中的指针单元和它与帧存贮器及彩色转盘的相互联接关系。
图3说明了相位变化事件前后,垂直同步信号,彩色转盘位置和SLM显示的数据之间的相位关系。
图4说明如何使用指针控制单元保持彩色转盘和SLM显示数据之间的同相关系。
图5表示出了一个可以按照本发明管理的场移位寄存器。
图6表明了图1中的马达控制单元和它与水平同步信号和彩色转盘马达的相互联接关系。
图7表明图6中的马达控制单元产生的驱动信号。以及同彩色转盘的位置的近乎恒定的相位关系。
参见序号为07/678.761名称为"用于脉宽调制显示系统的DMD的结构和时算控制"的美国专利,它描述了一种以DMD为基础的,但不具备本发明特征的投身显示系统。该专利还描述了一种用该系统对要使用的视频数据进行格式化的方法,以及调制比特平面提供灰度色标图象的方法。参见序号为07/809,816,名称为"强化白光的彩色场顺序投影"的美国专利,它描述了具有彩色转盘的以DMD为基础的投射系统产生序列彩色图象的一般用法。
图1是以SLM为基础的投射显示系统内的方块图,该系统可以从视频信号的象素采样数据中产生彩色图象。该视频信号可以是任何能对其象素数据采样的信号。例如;这种视频信号可以是电视广播信号,它可以被采样,及转换成RBG数据。这种视频信号也可以是诸如计算机信号源来的RBG信号或数字信号。在任何情况下,各种类型视频信号的共同特征是存在垂直同步信号,水平同步信号和能采集数字彩色数据的成分。对本说明书来说,可以假定这种视频信号为一种模拟信号。
综观系统10,信号接口单元11接收视频信号,并产生模拟视频信号和同步信号送入信号处理单元12。接口单元11送出的视频信号既可以是交错信号,也可以是非交错信号,并且可能既代表RBG数据又代表亮度/色度数据。
信号处理单元12将模拟视频信号转换为数字视频信号。它还可以加入诸如画中画和在屏幕状态下显示的特色。一般来说,信号处理单元12使显示数据达到要求的状态,并为系统10提供中心时标。若数据是交错的,信号处理单元12还提供从场到全帧的扫描变换。
显示电子单元13在数据格式变换器13a中重组数字视频信号,使数据和比特平面格式化,以实现序列彩色图象。合适的数据格式变换器13a的细节可以在序号为07/755,981名称为"具有正交输入/输出和三维记录的数据格式变换器"的美国专利中找到,现引入在此参考。帧存贮器13b存贮向SLM 13c传送的帧图象数据,并按照此处描述的本发明予以管理。SLM 13c可以是任何类型的SLM。尽管本说明书是借助DMD约SLM作说明的,但任何其它类型的SLM都能替代该设备并用于此处描述的方法。合适的DMD13c的详细情况可以参见霍恩贝克(Harnbeck)的序号为4956619名称为"三维光学调制器"的美国专利。
显示光学单元14接收SLM 13c来的图象,并将显示图象送到诸如显示屏17那样的图象平面。彩色转盘14a在工作时是旋转的,以使每一个比特平面通过相应的颜色滤光器传送出去。对本发明书来说,彩色转盘14a响应红、绿和兰色的数据,但其它颜色也可以使用。
控制单元15提供各种系统控制功能。它具有一个指针控制单元15a可用来使SLM 13a获得的数据的时标和彩色转盘14a的位置同步,这一点将在下面结合图2-4作进一步的解释。控制单元15还包括一个马达控制单元15b,它给马达16a提供一个驱动信号DS,这将在下面结合图6和7作进一步说明。指针控制单元15a的设计和操作与马达控制单元15b是相互独立的;投射显示系统10可以择一地被实现也可以同时被实现。
机械单元16提供各种机械系统功能。它具有一个驱动转盘14a的马达16a。
图2表明了指针控制单元15a和帧存贮器13b,SLM 13c,彩色转盘14a,和彩色转盘马达16a之间的关系。
图2设计的基本思路是如何通过控制从存贮器13b中读出的数据来代替改变彩色转盘14b的相位,实现对彩色相变的再同步的。正如上面背景技术部分已说明的,这些相变可以因各种原因发生,例如:作为改变电视机频道的结果。
帧存贮器13b具有三个区,每一种颜色一个区。在本说明书中,采用24比特象素数据的例子,假定帧存储器13b对每一帧图象提供24个比特平面,每种颜色包括8个处于待显示格式的比特平面。换言之,从帧存储器13b中读出的数据是格式化了的。因此所有的颜色变换,扫描变换,和其它处理已经进行过。所以输出的每一个比特平面都是准备就绪,可待SLM 13c显示的。在一帧的周期内,在本例中是1/60秒,这24个比特平面都将被SLM 13c显示,构成一个"象帧"。根据帧存贮器13b的结构,将数据格式化成DMD显示的比特平面工作,既可以在输入前,输入时进行也可以在输出时进行。将数据格式化成SLM显示的比特平面和将数据写入和读出帧存贮器都在上面提到的美国专利和专利申请中有所讨论。
帧存贮器13b分配给那些每个比特具有相同二进制权重的比特平面数据的部分,在此称作帧存贮器13b的一个"平面"。通常,存贮器13b作为先进先出缓冲寄存器工作,因此,从它们的存贮器平面读出的比特平面,以同它们被写入时一样的次序到达SLM 13c。如下面结合图3说明的那样,每一个存贮器平面具有一个确切的写入缓冲寄放器和一个读出缓冲寄存器,它们是切换触发式联结的。以便当一个读出时,另一个可以写入。这项技术有时也称作"乒乓"缓冲寄存器技术。
写入指针WP被用来保持向帧存贮器13b写入数据的速率与视频信号源一致。在典型情况下,存贮器13b的所有三个区都由写入指针控制。这样,三个存贮器平面,每种颜色一个,将同时接受一个比特平面的数据。垂直同步信号可以用来控制写入指针,以便使帧信号写入存贮器时具有与投射系统接收输入视频数据时相同的平均速率。
读出指针RP用来使从帧存贮器13b中读出的数据进入SLM 13c中时具有同它被写入时一样的平均速率。如下面将说明的,控制读出指针是为了使读出过程与彩色转盘14a的相位同步。
SLM 13c接收来自帧存贮器13c的数据,一次一个比特平面。SLM 13c被装置于一个固定点上,以便彩色转盘14a将SLM 13c来的反射光滤光到成象平面17上。SLM 13c将光源(未表示出)来的白光反射出去,并借助其镜元件的取位形成一个图象。被反射的光经彩色转盘14a滤光,然后在此已经彩色滤光的图象被投射在象平面17上。当彩色转盘14a旋转时,象平面17被正处于SLM 13c前面的彩色光照亮。如背景技术部分中指出的,彩色转盘14a也可以放置在白光源和SL同13c之间,这时此处描述的本发明仍将适用。
对于实施图24来说,彩色转盘马达16a可以是任何类型的马达,只要能以恒定的速度驱动彩色转盘14a。在本说明书中,可以假定其速度与每秒60帧的象帧速率相同,也就是每秒60转。
重新参看图1,彩色转盘14a具有一条关于B的颜色界线,事实上在不同颜色之间都有一条界线。如图2所示,检测器21放置在靠近彩色转盘14a的位置上,当彩色转盘14a旋转时,它就能检测到那些颜色界线之一上设置的一个标记23。彩色转盘每转一次检测器21就发出一次信号,该信号被传送到时标发生器15a。这使时标发生器15a能够决定每一条颜色界线何时通过一个固定的参考点。
传送到SLM 13c的数据和彩色转盘14a的位置之间的关系在此称作"颜色-相位"关系。当彩色转盘14a的一个颜色区在SLM 13前通过时,这种颜色的所有比特平面都被SLM 13显示,则说明数据和彩色转盘14a是同相的。
一个"帧周期"代表两个垂直同步脉冲之间的时间间隔,彩色转盘14a在每个帧周期内转动一次。对一种24比特的象素数据来说彩色转转14a转动一圈的时间正好使所有24个比特平面都被SLM 13c显示一次。
时标发生器15a产生马达驱动信号DS,它被传送到驱动马达16a,以固定转速驱动彩色转盘14a。时标发生器15a还能产生写入指针WP。和读出指针RP,以控制帧存贮器13b数据的流入流出。
图3表示在相变事件前后垂直同步信号V,彩色转盘14a的位置,和SLM 13c显示的数据之间的相位关系。在本例中,说明了由于改变电视信号频道引起垂直同步信号不连续时的相位变化的情况。
在频道改变之前,垂直同步信号,彩色转盘14a和数据都是同相的,此时,垂直同步信号和彩色转盘14a的每一条蓝-红边界相对应并同红色数据的起始对应。
在频道改变以后,垂直同步信号和彩色转盘14a的旋转起始点未必配匹,从这一意义上垂直同步信号和彩色转盘14a不再同相。若新频道的第一帧数据,在垂直同步信号开始时被读出送入SLM 13c,那么数据和彩色转盘14a也将不匹配。换言之,数据和彩色转盘14a将异相。然而如上面指出的,彩色转盘位置和DMD 13b显示数据之间的同相关系是被相等维持的。
图4说明了如何对帧存贮器13b进行管理来维持彩色转盘14a和SLM 13c显示的数据的同相关系。图中分别表示出了存贮器13b的R、G或B区的信号存贮平面41,但应当理解每一种R、B或G区对那种颜色存在多比特平面。在本说明书的24比特象素例子中,每一种R,B或G区有8个存贮平面41。
帧存贮器13b的特点是它的R、G或B区中的任一种能被独立地访问,并开始读出一个比特平面到SLMB中去。例如:当彩色转盘14a的红色边界到达一个合适的点时,指针控制单元15a可以读出指针RP发出指令,从存贮器13b的红色区内读出红色比特平面。然后再重复对绿色和兰色区进行阅读。在兰色区内将兰色比特平面读出后,读出指针返回红色区。
每一个存贮平面41具有分配给读出缓冲寄存器的空间。当先前的比特平面从读出缓冲寄存器中读出时,写入缓冲寄存器被写入新的比特平面数据。在读出缓冲寄存器读出后,写入指针和读出指针被切换,以便写入缓冲寄存器成为读出缓冲寄存器,并且反过来也一样。另外每个存贮平面41还具有一个溢出空间45。
在图4中,每一个存贮平面41中的阴影区域是当前的读出缓冲寄存器,无阴影的区域是当前的写入缓冲寄存器。读出缓冲寄存器包含一个完全的比特平面n。如图中读出指针位置指出的三色比特平面是将要读出的。写入缓冲寄存器正在写入比特平面(n+1)。溢出区域45可供当前写入缓冲寄存器使用。一般来说,在缓冲寄存器被切换后,写入溢出区域45才可供当前的写入缓冲寄存器使用。
传感器21根据SLM 13c的要求放置,以便参照界线和从SLM 13c来的图象的位置之间有一个已知的时间关系。在一种简单的实施方案中,传感器21可以这样放置,当参照界线在SLM 13c前面通过时,传感器检测到此界线。
在运行中,传感器21检测参照界线并将此反馈信号传送给指针控制单元15a。根据此信息,控制单元15a测定下一个界线将于何时到达。另一个办法,可以检测彩色转盘14a上的每一条界线,当界线通过传感器21时,提供一个单一的信号。在任何情况下,指针控制单元15a都将产生一个读出指针在合适的时间指向存贮器13b的区域。
在图4中,彩色转盘14a在图3的相变事件后已经转到一个新的位置,在下一条界线即绿-兰界线在SLM 13c前面时,正好被传感器21检测到。作为响应,传感器21向控制单元15a送出一个信号,控制单元将读出指针移到存贮器13b的兰色区的平面41,这样,当彩色转盘14a的兰色部分在SLM 13前面时,SLM 13c将获得兰色的数据。同时,为了写入一帧新频道的数据及写入使彩色转盘提前到绿-兰界线花费的时间,数据的读出过程已被延迟了一个必要的时间。
对每一个存贮平面41,写入溢出部分45的容量至少为1/3比特平面。这样,分配每个存贮平面的41写入数据的部分具有至少1比特平面的容量。这样可以适应最坏的情况,当一条界线刚通过图象显示区,在新界线到达以前,有1/3帧的周期的等待。在这种情况下,在读出重新开始前,写入将继续1/3帧的周期。
图5说明了处理单元12更详细的情况。处理任务由分开的两个功能单元12a和12c来完成,场缓冲寄存器12b置于两者的数据路径上。场缓冲寄存器12b用来在彩色转盘不同步期间提供图象,并且执行"场展开"功能。作为如上面讨论的,通过对帧存贮器13b管理使彩色转盘同步的替代方法,场缓冲寄存12b也可以按相同方式管理。当视频信号是交错信号时这个替代方法是特别有效的,因为场缓冲寄存器12b在典型的情况下比帧缓冲寄存器更小和更不昂贵,而帧缓冲寄存器随价格降低尺寸可能增大。
再次参见图3,因调整时标周期期间垂直同步信号被中断,彩色转盘14a的位置假定出现短暂的不连续。在实践中,彩色转盘14a的马达15a的一种驱动方式是借用垂直同步信号。这样,相变事件将导致一个瞬变过程,在此时间内马达15a将失去驱动信号,并且在此以后马达15a必须与垂直同步信号重新同步。在此时间内,显示图象可能被破坏,或在使用其它方式驱动情况下出现显示空白。
图6说明马达控制单位15b,它从水平同步信号中产生一个驱动信号。如将在下面说明的那样在相变期间就减小的彩色转盘14a位置的瞬态效应,同时可以增大对彩色转盘相应的调节范围。
虽然,这里描述的马达控制单元15b是使用一个以SLM为基础的投射系统10,但是任何其它类型的接收水平同步信号和采用彩色转盘的视频显示系统也可以使用。例如,马达控制单元15b可以是一种光栅扫描显示系统。
马达控制单元具有一个振荡器61,它接收水平同步信号。在本说明书中,水平同步信号是每帧525行的信号。如以下说明的,振荡器61用预定的倍频因子乘以信号,以使n分频计数器65产生一列方波。在本例中,振荡器61在水平同步信号频率的4倍频率下工作,以产生第一脉冲信号。典型情况下,振荡器61是一个电压调制的振荡器,以提供一个脉冲输出。
n分频计数器65接收从振荡器61来的脉冲信号,并用每帧的行数除收到的信号,在本说明书的例子中n=225。结果产生一个频率等于垂直同步信号和振荡器61的频率因子乘积的"帧脉冲"信号。
然后,第二n分频计数器65用某些预定的分频因子除该信号,一般分频因子是振荡器61的倍频因子的一半。在本例中由于倍频因子是4,所以计数器65的n值为2。产生的方波是对称的,并具有每秒60周的频率,它同垂直同步信号每秒60周的频率相匹配。这个方波可以被放大或作其它调整后,驱动一个单相交流马达16a。
虽然在图6中没有表示出来,但控制单元60还能用来为正交相位马达提供一对驱动信号。在这种情况下,振荡器61将具有水平同步信号8倍的频率。计数器65可以是一个四分频的约翰逊(Johnson)计数器,它有两个频率均为每秒60周的相位差为半周的输出信号。
图7说明尽管有如图3那样的频道变化事件,但是彩色转盘却具有避免瞬变过程位置时的情况。图6说明马达控制单元1 5b产生驱动信号DS的过程。由于使用水平同步信号驱动马达16a,当相变事件发生时,可以在无明显中断的情况下继续产生驱动信号。这时瞬变时间被限制在行周期内而不是在信号的帧周期内。换言之,最大中断只是两个水平脉冲之间的时间周期,对于一个具有525行的帧来说,中断在64微秒的量级上。
马达控制单元15b的另一个优点是具有使彩色转盘14a与垂直同步信号重新同步的能力。重新参见图3,在相变事件后,一般来说彩色转盘14a与垂直同步信号是不同相的。在写入指针是由垂直同步信号驱动的系统中,可能有这样的情况,其中读出指针处于当前被显示的帧的结束处,而写入指针在下一帧的起始处。这导致存贮空间的最多使用。然而,当彩色转盘14a的相位能够同垂直同步信号的相位逐渐的匹配,读出指针和写入指针就能被较紧密的组织在一起。这是通过对驱动波形的周期作少量变动来实现的,例如通过逐渐增加或减小计数器65的n值,直到获得希望的相位关系。为优化存贮器的使用,可维持这样的状态,将读出指针放在适当位置以便存贮器13b的每一个区域在任何时候都处于半满的状态。
虽然本发明是参照特殊的实施方案说明的,但不能把本说明书解释为是对发明的限定。对熟悉本领域的技术人员来说,对上述公开的实施方案作各种改进及提出替代的实施方案将是显而易见的。因此,可以预期所附的权利要求将复盖落在发明真正范围内的所有改进方案。
Claims (11)
1.一种彩色转盘马达控制单元,用于采用马达驱动彩色转盘从具有水平同步信号和垂直同步信号的视频信号中显示多帧彩色图象的显示系统,其特征在于,它包括:
一个振荡器,用于接收水平同步信号并产生一个频率为所述水平同步信号和一个频率因子乘积的第一脉冲信号;
一个n分频计数器,用于接收从所述振荡器来的第一脉冲信号,并用一个等于每帧行数的值来除所述的交错信号,以便产生一个帧脉冲信号;
第二个n分频计数器,用于接收所述的帧脉冲信号,并用预定的分频因子除所述的帧脉冲信号,以便产生一个周期与所述的垂直周期信号相等的方波信号。
2.按照权利要求1的马达控制单元,其特征在于,所述的振荡器产生一个频率为所述的水平同步信号频率四倍的所述的第一脉冲信号,并且所述的第二n分频计数器用2除所述的帧脉冲信号。
3.按照权利要求1的马达控制单元,其特征在于,所述的振荡器是一个电压控制的振荡器。
4.按照权利要求1的马达控制单元,其特征在于,进一步还包括将所述方波信号转换成两个用来驱动相位马达的不同相信号的装置。
5.按照权利要求1的马达控制单元,其特征在于,所述的第二n分频计数器是一种用来提供两个方波信号的约翰逊(Johnason)计数器。
6.按照权利要求1的马达控制单元,其特征在于,所述的第一n分频计数器可以被改变成多于一个n值的情况下运行的计数器。
7.一种为用于显示系统的彩色转盘马达提供驱动信号的方法,所述的显示系统用一个马达驱动的彩色转盘,从具有水平同步信号和垂直同步信号的视频信号中显示多帧彩色图象,其特征在于,这种方法包括下列步骤:
将水平同步信号变换成频率为所述水平同步信号和一个频率扩大因子乘积的第一脉冲信号;
用一个等于每帧行数的值为除所述的第一脉冲信号,产生一个帧脉冲信号;
用一个预定的分频因子除所述的帧脉冲信号,产生一个周期等于垂直同步信号的方波信号;
用从所述方波信号中产生的驱动信号驱动彩色转盘马达。
8.按照权利要求7的方法,其特征在于,所述的频率扩大因子是4,所述的分频因子是2。
9.按照权利要求7的方法,其特征在于,进一步还包括将所述的方波信号分成两个不同相方波信号的步骤。
10.按照权利要求7的方法,其特征在于,进一步还包括改变所述的第一n分频计数器的分频因子的值,以改变所述的方波相位的步骤。
11.按照权利要求10的方法,其特征在于,进一步还包括重复所述的改变所述分频因子值的步骤,以便在所述方波和垂直同步信号之间逐渐获得一种符合期望的相位关系。
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CN101167370B (zh) * | 2005-04-28 | 2011-09-07 | 皇家飞利浦电子股份有限公司 | 投影系统及用于操作投影系统的方法 |
Also Published As
Publication number | Publication date |
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TW289201B (zh) | 1996-10-21 |
KR950003860A (ko) | 1995-02-17 |
DE69413908T2 (de) | 1999-05-12 |
US5657099A (en) | 1997-08-12 |
US5365283A (en) | 1994-11-15 |
EP0638892B1 (en) | 1998-10-14 |
DE69413908D1 (de) | 1998-11-19 |
KR100338609B1 (ko) | 2002-10-25 |
EP0638892A1 (en) | 1995-02-15 |
CN1124900A (zh) | 1996-06-19 |
CA2128308A1 (en) | 1995-01-20 |
CN1107420C (zh) | 2003-04-30 |
CN1041685C (zh) | 1999-01-13 |
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