CN1682269A - 在顺序照明显示器中的时间抖动以增加图像的动态范围 - Google Patents
在顺序照明显示器中的时间抖动以增加图像的动态范围 Download PDFInfo
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Abstract
一种通过将每一象素分成两个或多个与适当的照明同步地提供给显示器面板的时移采样来增加图像动态范围的方法。
Description
本发明通常涉及一种增加图像中灰度级数的方法,并且更具体地涉及一种增加图像中灰度级数而不增加数模转换的动态范围的方法。
在改进的电视***的开发中,特别是在投影领域中已经发现,反射式液晶显示器(LCD)或硅上液晶(LCOS)在大屏幕数字显示器中具有高分辨率的特性。因为显示器是在硅上制作的,所以LCOS显示器能够产生小的象素尺寸和高分辨率。这种反射式显示器具有较大的象素孔径比,其可以产生平滑并且连续的图像,特别适用于自然图像和视频显示器。开发单面板彩色投影视频显示器通过在全部时间在显示器面板上保持全部颜色能够创建彩色图像,而不产生与常规色轮***相关的2/3的光损失。
对不同有彩色条纹通常是对红、绿和蓝的连续滚动操作是这样的:在条纹离开显示器面板的底部时,该条纹被分开并被不连续的重定向到面板的顶部。同该光学扫描共同设置的有电子扫描,其寻址具有对应于照射到象素行上的光线的颜色的信号的象素行。通过该显示器面板的光带序列出现地非常快,给观察者的表现就是同时出现所有颜色。
在这种视频***中,其中将数字视频采样转换成模拟电压,并然后被采样到象素阵列中,通过视频数模转换的动态范围来限制灰度级数。
本发明致力于克服与相关技术有关联的一个或多个问题或缺点。
在本发明的方法中,图像中的灰度级数增加,但是不会增加数模转换的动态范围。在该方法的一个实施例中,通过将每一象素分成两个或多个与适当的照明同步地提供给显示器面板的时移采样,影响这种增加。例如,通过使用8位的数模转换可以将使用8比特至12比特象素的***中的灰度级数从256级增加到4096级。这种技术在电影、医疗和高级CAD应用中会非常有用。本发明致力于解决一个或多个这些问题。
在通篇附图中,相似的附图标记表示对应的部分,其中:
图1的光学示意图为用于利用本发明的适当的单面板彩色投影视频显示器***;
图2为与本发明一起使用的象素阵列的行和列驱动器的一般表示;
图3为对输入到模数转换器的红、绿和蓝信号进行信号处理的图解表示;
图4为用于利用本发明的双条纹单色***的光学图解;和
图5所示为图4中所示的光学***的条纹在显示器面板上会出现的方式。
现在参照图1,所述为单面板滚动彩***显示器***50的光学示意图,其中非同轴地安装有3个棱镜58、72和80,分别用于红、绿和蓝色中的每一个。需要理解的是,出于简明的原因,该附图中省略了用于成形光带的光学元件。如图所示的这种扫描***特别适用于高照度的应用,诸如电影、医疗和高级CAD应用。
该扫描***50包括光源52,其包括发射白光的反射灯。由灯52发出的光束54首先通过第一分色分离镜(dichroic splitting mirror)56,红光从其中通过,并且其它颜色光被反射。从镜56出来的红光束57然后照射到第一旋转棱镜58上,其对红光束57进行操作以在垂直方向上对该光束进行扫描。光束57然后穿出棱镜58并照射到镜子60上,其将光束57反射通过分色镜74(红光从其中通过)到达分色重组镜(dichroic re-combining mirror)62,该分色重组镜将红光束57反射到显示器面板或光阀64,其根据视频信息调制该红光,并根据其将该光线传送到投影透镜66。
从分色镜56反射的绿光和蓝光照射到分色镜68上,其可以反射绿光并通过其它颜色光。相应地,绿光束70被镜子68反射,并照射到旋转棱镜72上,其用于在如图所示的方向上扫描绿光束70。该绿光束70然后到达分色镜74,其将该绿光束70反射到重组镜62,该重组镜将绿光束70反射到LCD显示器面板或光阀64上。
穿过分色镜68的光束形成蓝光束76,由于分别通过分色镜56和58的作用已经将红色分量和绿色分量从光束54中除去。此后蓝光束76被镜子78反射到旋转棱镜80上,其扫描蓝光束76并将该蓝光束76传送到重组镜62,该重组镜将蓝光束76传送到显示器面板或光阀64上。通过旋转棱镜80的作用,也在垂直方向上对绿光束76进行扫描。
棱镜58、72和80的作用是会产生对显示器面板64上的红、绿和蓝光带所进行的扫描。
如本领域所已知的,在这种显示器中使用由行驱动器R1、R2和R3(图2)其中的一个同时开启一行中的所有象素来对行进行顺序寻址。行中的各个象素通过一系列的列驱动器1、2、3和4进行驱动。列驱动器基本上是存储器件,其对进入的视频信号进行采样,并在各个存储单元中存储采样值。使用单面板彩色投影视频显示器***,在显示器面板或光阀64上对红、绿和蓝3个色带进行垂直扫描。在一个视频帧期间,通过首先通过红光带,然后通过绿光带,最后通过蓝光带来对每一行进行照明。通过例如在绿光带到达该行之前并且在红光带通过之后装载绿光值的这种方式执行特定行的编程。由于在任一时刻所有的3个色带都照明该面板,所以在一个正常的视频线的时间期间必须编程3个行。顺序地执行该操作,并且当色带移过面板64时,该编程对它们进行跟踪。
在图3中所述为通过图解的方式对红、绿和蓝信号进行的信号处理。将每一颜色信号输入到模数(A/D)转换器22、24和26,从而以数字形式进行信号处理。此后将R信号输入到第一延迟线28,其将红信号延迟时间t1。绿信号输入到将其延迟时间t2的延迟线30,并且蓝信号输入到延迟线32以便在时间t3延迟。根据显示器面板64上的各个色带的位置和扫描速度来选择这些时间。
颜色信号然后传送到切换器34,其顺序地选择延迟电路28、30和32的每一输出,使得切换器34的输出是按前述顺序的具有视频线的象素的串行流。此后将信号输入到切换机构,用于将串行化延迟的流应用到显示器面板64。
视频流传送到切换器36,其将该视频流分成第一流38和第二流40。操作切换器36以便将视频流划分成对应于每一线的第一半和第二半的二等分。此后,通过线38将切换器36的输出连接到切换器42,该切换器42可以用于对奇象素和偶象素把输入分开。奇象素的输入被送到缓冲存储器44,并且此后将缓冲存储器44的输出传送到数模转换器46,该数模转换器46的输出与图2中所示的列驱动器1耦合。偶象素流被传送到缓冲存储器48和数模转换器90,并且此后以类似的方式传送到列驱动器2。视频线的第二半通过线40耦合,并且通过奇偶切换器92进行类似处理,其在奇和偶象素之间交替并利用缓冲器94、98和D/A转换器96、99,分别输出到列驱动器3和4。
为了增加在这种视频***中或在单色成像***中的灰度级数,例如从256级增加到4096级(使用8位数模(D/A)转换的8位至12位象素阵列),首先将每一象素的高8位转换为模拟电压并应用到每一象素位置。然后使用全强度的光来照明被寻址的象素位置。然后将每一象素的低4位转换成(全标度)模拟电压,其应用到被采样的每一象素,以及使用1/256强度的光来照明的阵列。一种替换方法可以对在低于全标度级的水平上每一象素的低4位进行转换,并且成比率地增加照明的强度。该相同的技术可以用于单色或彩色图像。帧速率应该足够高,以避免闪烁或其它时间假象。
为了更好的解释本发明的方法,参照图4的光学图解以及对如图5中所示的显示器面板或光阀64a上的条纹进行的附带扫描。因为本发明的方法可以用于彩色图像或者单色图像,为了便于说明,将参照使用双带单色***。然而应该理解的是,参照图4和5所述的***可以用于红、绿和蓝3个颜色中的每一个。
类似于图1中所述的彩色成像***,包括发射白光的反射灯的光源52a被传送到分束器53,由此分束器53传输第一光径55中的(m/256)L,并将第二光径65中的(n/256)L反射到镜子63,其中n+m=256,优选地n=1,m=255。
暗光(n/256)L在光径65中从镜子63通过缝隙71传送进入旋转棱镜73。而(m/256)L光沿光径55传播通过缝隙51并进入旋转棱镜59。此后,光束将传播通过或被分束器74a重新定向到偏振分束器69和显示器面板64a。
通过分别传播通过缝隙71和51的光确定相应的条纹(n/256)L和(m/256)L的高度。该高度优选地是显示器面板高度的一半。
旋转棱镜73和59被相移,从而它们使得暗条纹(n/256)L向显示器面板180下面滚动,与亮条纹(m/256)L的相位相差180度。相应地,假定没有过扫描(过扫描=0%),这两个条纹会向面板下面滚动180度的异相,并且光总是在面板上,如图5中所述。
但是每一棱镜面的大小将确定在显示器面板上的过扫描的量,并且为了简明,上面没有描述过扫描,更加实际的范例是具有大约5%的过扫描,以允许有用于防止条纹重叠的分量容差,并且在用于写数据的条纹之间提供黑色间隙。如所述,在刚刚到达每一条纹的前沿之前将每一条纹的视频寻址送到显示器面板。
对于说明性范例,假定该亮条纹的亮度为(255/256)kL,并且该暗条纹的亮度为(1/256)kL,并且所需要的每一象素的动态范围是12比特。如果想要使用十六进制的12比特值47A更新在X行Z列中的象素,那么当亮条纹的前沿到达X行的时候,使用等于象素的高8位或十六进制数47的模拟值来更新Z列。当暗条纹的前沿到达X行的时候(半帧之后),使用等于象素的低4位或十六进制数A的模拟值来更新Z列。相应地,当在帧时间上通过人眼注视时,象素显示为12比特的值、十六进制数47A。
在操作中,本发明增加图像中的灰度级数而不会增加应用到图像显示面板的象素的数模转换的动态范围。无论是彩色还是单******中的这种从256级到4096级的增加,使用8位D/A转换的8比特至12比特象素阵列首先将每一象素的高8位转换成应用到每一象素位置的模拟电压。然后使用基本上全强度的光来照明被寻址的象素位置。接着将每一象素的低4位转换成全标度模拟电压,其应用到每一采样象素,和大约与具有1/256强度的光的起始滚动的相位相差180度照明的阵列。当在帧时间上通过人眼注视时,象素显示为12比特的值。
一种增加灰度级的替换方法可以对低于全标度级的水平的每一象素的低4位进行转换,并且成比率地增加照明的强度。
可以从对附图、说明书和所附权利要求书的研究中得到本发明的其它方面和特征。
Claims (14)
1.一种通过将每一象素分成为时移采样来增加象素***的图像动态范围的方法,其包括步骤:
提供光源L,并将所述光分成第一亮度光带和第二亮度光带;
扫描跨过光阀的所述第一光带;
使用与所述第一光带的扫描同步的第一视频信息对所述光阀进行寻址;
对跨过所述光阀大约与所述第一光带的相位相差180度的所述第二光带进行扫描;和
使用与所述第二光带的扫描同步的第二视频信息对所述光阀进行寻址。
2.权利要求1的方法,其中所述象素***是12位的象素***。
3.权利要求2的方法,其中所述第一光带的所述亮度是(255/256)L,并且所述第二光带的亮度是(1/256)L。
4.权利要求1的方法,其中所述第一光带的亮度大于所述第二光带的亮度。
5.权利要求1的方法,其中刚刚在所述光带的前沿之前对所述光阀进行寻址。
6.权利要求1的方法,其中所述第一光带的亮度与所述第二光带的亮度成比例。
7.一种视频显示象素转换***,包括:
光带源L,所述光带彼此相互分开;
光阀装置,用于根据输入视频信号接收所述光带;
装置,用于跨过所述光阀装置顺序移动第一个光带;
装置,用于跨过所述光阀装置移动第二个光带,大约与所述第一个光带的相位相差180度;和
装置,用于使用对应于成像在其上的光带亮度的视频信息对所述光阀进行寻址,使得通过所述光阀装置与第一视频信息同步地接收所述第一个光带,并且通过所述光阀装置与第二视频信息同步地接收所述第二个光带,以在所述光阀装置上合成其输出。
8.权利要求7的视频显示象素转换***,其中所述象素***是12位象素***,所述第一个光带具有的亮度是(m/256)L,并且所述第二个光带具有的亮度是(n/256)L,其中m+n=256。
9.权利要求8的视频显示象素转换***,其中所述第一个光带与视频信息的高8位同步,并且所述第二个光带与视频信息的低4位同步。
10.权利要求7的视频显示象素转换***,其中用于移动所述光带的所述装置包括至少一个旋转棱镜,用于在所述光阀装置上大约彼此相互相位相差180度地移动所述光带。
11.权利要求10的视频显示象素转换***,进一步包括固定的分束器,以将光束分开并引导到所述旋转棱镜。
12.权利要求10的视频显示象素转换***,进一步包括用于跨过所述光阀装置形成预定高度的条纹的装置。
13.权利要求7的视频显示象素转换***,其中所述第一和第二光带被过扫描了大约5%。
14.权利要求7的视频显示象素转换***,其中用于寻址所述光阀装置的装置刚刚在所述第一和所述第二光带的每一个的前沿之前寻址所述光阀装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/247,199 US7064795B2 (en) | 2002-09-19 | 2002-09-19 | Temporal dithering to increase dynamic range of images in sequentially illuminated displays |
US10/247,199 | 2002-09-19 |
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CN1682269A true CN1682269A (zh) | 2005-10-12 |
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CNA038222825A Pending CN1682269A (zh) | 2002-09-19 | 2003-09-12 | 在顺序照明显示器中的时间抖动以增加图像的动态范围 |
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US (1) | US7064795B2 (zh) |
EP (1) | EP1543490A1 (zh) |
JP (1) | JP2006500616A (zh) |
KR (1) | KR20050057369A (zh) |
CN (1) | CN1682269A (zh) |
AU (1) | AU2003259500A1 (zh) |
TW (1) | TW200428096A (zh) |
WO (1) | WO2004027745A1 (zh) |
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US7196687B2 (en) * | 2002-11-05 | 2007-03-27 | 3M Innovative Properties Company | Swept illumination to reduce LCD lag in front and rear projection displays |
TW200513680A (en) * | 2003-06-30 | 2005-04-16 | Koninkl Philips Electronics Nv | Color recombination for display systems |
US7147332B2 (en) * | 2004-07-21 | 2006-12-12 | 3M Innovative Properties Company | Projection system with scrolling color illumination |
US7436389B2 (en) * | 2004-07-29 | 2008-10-14 | Eugene J Mar | Method and system for controlling the output of a diffractive light device |
US7098801B1 (en) | 2005-06-28 | 2006-08-29 | Seagate Technology Llc | Using bitmasks to provide visual indication of operational activity |
US7746303B2 (en) * | 2005-11-17 | 2010-06-29 | Honeywell International Inc. | Method and apparatus for extending the color depth of displays |
US7883216B2 (en) * | 2006-02-13 | 2011-02-08 | High Definition Integration Ltd. | Methods and systems for multiple primary color display |
EP2046065A1 (en) * | 2007-10-04 | 2009-04-08 | Barco NV | Split scrolling illumination for light modulator panels |
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US5548347A (en) * | 1990-12-27 | 1996-08-20 | Philips Electronics North America Corporation | Single panel color projection video display having improved scanning |
US5416514A (en) * | 1990-12-27 | 1995-05-16 | North American Philips Corporation | Single panel color projection video display having control circuitry for synchronizing the color illumination system with reading/writing of the light valve |
US5644357A (en) * | 1994-12-15 | 1997-07-01 | Philips Electronics North America Corporation | Burst driving of single-panel display |
US6497485B1 (en) * | 2000-01-20 | 2002-12-24 | Seiko Epson Corporation | Image projection system having uniform brightness |
DE69835311T2 (de) * | 1997-03-12 | 2007-07-19 | Texas Instruments Inc., Dallas | Farbsequentielle Video-Anzeigevorrichtung		 |
US20020071140A1 (en) * | 1998-06-03 | 2002-06-13 | Takashi Suzuki | Threshold matrix, and method and apparatus of reproducing gray levels using threshold matrix |
KR100363826B1 (ko) * | 1999-06-07 | 2002-12-06 | 히다치덴시 가부시키가이샤 | 넓은 다이내믹레인지의 영상신호를 생성하는텔레비젼신호처리장치와 그 신호처리장치를 가지는텔레비젼카메라 및 텔레비젼신호처리방법 |
US6568811B2 (en) * | 2000-06-12 | 2003-05-27 | Matsushita Electric Industrial Co., Ltd. | Color image display device and projection-type image display apparatus |
US7050122B2 (en) * | 2000-07-03 | 2006-05-23 | Imax Corporation | Equipment and techniques for increasing the dynamic range of a projection system |
JP2003302702A (ja) * | 2002-04-11 | 2003-10-24 | Mitsubishi Electric Corp | 投写型表示装置 |
-
2002
- 2002-09-19 US US10/247,199 patent/US7064795B2/en not_active Expired - Fee Related
-
2003
- 2003-09-12 CN CNA038222825A patent/CN1682269A/zh active Pending
- 2003-09-12 WO PCT/IB2003/003973 patent/WO2004027745A1/en not_active Application Discontinuation
- 2003-09-12 KR KR1020057004506A patent/KR20050057369A/ko not_active Application Discontinuation
- 2003-09-12 AU AU2003259500A patent/AU2003259500A1/en not_active Abandoned
- 2003-09-12 EP EP03797458A patent/EP1543490A1/en not_active Withdrawn
- 2003-09-12 JP JP2004537415A patent/JP2006500616A/ja active Pending
- 2003-09-16 TW TW092125482A patent/TW200428096A/zh unknown
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TW200428096A (en) | 2004-12-16 |
US7064795B2 (en) | 2006-06-20 |
AU2003259500A1 (en) | 2004-04-08 |
EP1543490A1 (en) | 2005-06-22 |
JP2006500616A (ja) | 2006-01-05 |
KR20050057369A (ko) | 2005-06-16 |
US20040056983A1 (en) | 2004-03-25 |
WO2004027745A1 (en) | 2004-04-01 |
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