CN1985212A - 彩色显示器 - Google Patents

彩色显示器 Download PDF

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CN1985212A
CN1985212A CNA2005800230820A CN200580023082A CN1985212A CN 1985212 A CN1985212 A CN 1985212A CN A2005800230820 A CNA2005800230820 A CN A2005800230820A CN 200580023082 A CN200580023082 A CN 200580023082A CN 1985212 A CN1985212 A CN 1985212A
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liquid crystal
display apparatus
light valve
valve layer
color display
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S·J·罗森达尔
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Koninklijke Philips NV
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • G02F1/1395—Optically compensated birefringence [OCB]- cells or PI- cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/34—Colour display without the use of colour mosaic filters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0469—Details of the physics of pixel operation
    • G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
    • G09G2300/0491—Use of a bi-refringent liquid crystal, optically controlled bi-refringence [OCB] with bend and splay states, or electrically controlled bi-refringence [ECB] for controlling the color
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display

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  • Physics & Mathematics (AREA)
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  • Engineering & Computer Science (AREA)
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  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

本发明涉及一种彩色显示设备，包括具有不同辐射频谱的至少两个光源(16，17)，以及液晶光阀层(14)。光源(16，17)被依次激活，并且光阀层被提供以驱动信号(d1，d2)，使得其获得强的波长依赖性。这允许显示设备产生原色，而无需提供彩色滤波器。这提供了比较简单的显示器，适用于移动应用并且提供了高亮度。

Description

彩色显示器
技术领域
本发明涉及一种彩色显示设备，用于显示彩色画面，包括：液晶光阀层，其具有若干个配置为阵列的图像单元；至少两个光源，具有实质上不同的辐射频谱并且被交替激活；以及颜色选择装置，用于与所述光源在所述彩色画面中共同产生原色。本发明还涉及一种控制这种彩色显示设备的方法。
背景技术
WO2004/032523 A1公开了这种显示设备。该显示设备包括具有两个彩色滤波器的像素，其每个被配置在子像素中，并且使用两个被交替激活的、不同的可选择光源。这种配置相对于包括白色背景光配置和用于每个像素的三个滤波器(RGB)的传统配置对于每个像素具有更宽的开口以及改善的色域。然而这种显示的一个问题是相对于黑白显示仍然复杂得多。
发明内容
本发明的一个目的是提供一种上述种类的彩色显示设备，具有减小的复杂度。
该目的通过根据权利要求1的显示设备和权利要求9的方法来达到。
更具体的，本发明涉及一种用于显示彩色画面的彩色显示设备，其包括：液晶光阀层，具有配置为阵列的若干个图像单元；至少两个光源，具有不同的辐射频谱并且被交替激活；以及彩色选择装置，用于与所述光源在所述彩色画面中共同产生原色，其中所述彩色选择装置包括驱动装置，用于向液晶光阀层中的图像单元提供至少第一和第二驱动信号，使得当接收第一驱动信号时图像单元在第一传输频带传输光，并且当接收第二驱动信号时，在与第一传输频带不同的第二传输频带传输光。
这允许在不使用昂贵的特殊彩色滤波器时显示若干个原色。替代地，液晶光阀层自身被用于过滤输入光。这提供了实际上更加简单的显示设备，对每个像素具有更大开口。
液晶光阀层优选的是未扭曲的向列液晶层。这种层为频谱依赖性提供了有益的电压。
作为替换，可使用OCB模式LCD层或垂直排列的液晶层。这产生了快速的切换显示。
光源优选的包括不同的发光二极管或不同的荧光灯。
优选的，液晶光阀层的延迟值大于400nm并且更加优选的大于600nm。这提供了有益的波长电压依赖性。
根据第二方面，本发明涉及一种控制显示彩色画面的彩色显示设备的方法，该设备包括液晶光阀层至少两个光源，所述液晶光阀层具有配置为阵列的若干个图像单元，所述至少两个光源具有实质上不同的辐射频谱并且被交替激活，该方法包括步骤：向液晶光阀层中的图像单元提供第一驱动信号使得图像单元在第一传输频带传输光，以及向该图像单元提供第二驱动信号使得图像单元在不同于第一传输频带的第二传输频带传输光。
该方法提供了对应于以上彩色显示设备的优点。
本发明的这些和其它方面将从参考以下描述的实施例中变得清楚和阐明。
附图说明
图1a和1b说明了本发明的普遍原理。
图2a和2b示意性地说明了根据本发明实施例的彩色显示设备；
图3a说明了未扭曲向列液晶层；
图3b说明了用于未扭曲向列液晶层的不同驱动电压的传输频谱；
图4a说明了其中使用四个发光二极管和两个不同的传输频谱的示例；
图4b说明了图4a的示例的色域；
图5说明了根据本发明实施例的显示设备中使用的控制配置。
具体实施方式
本发明总得来说涉及可使用于电视机、计算机监视器、移动电话显示器等中的彩色显示设备，用于显示静止或视频画面信息。
图1a和1b示意性地说明了本发明的普遍原理。
根据本发明实施例的显示设备包括两个光源A和B，分别具有不同的辐射频谱3和4，如图1a所示。第一光源A的辐射频谱3包括两个不同的颜色5、6，例如蓝色5和黄色6。第二光源B的辐射频谱4包括两个不同的颜色7、8，例如青色7和红色8。
根据本发明的实施例，该显示设备还包括液晶光阀层，以下称为LCD层。LCD层是频谱可选择的。驱动信号被提供给LCD层，使得LCD层的传输具有强的波长依赖性。当用第一电压驱动到第一状态时LCD层因此具有第一传输函数1，用短的波长(蓝色、青色)在第一传输频带10中传输光。当用第二电压驱动到第二状态时LCD层具有第二传输函数2，用较长的波长(黄色、红色)在第二传输频带11中传输光。
通过使用两个光源A和B以及LCD层状态的不同组合(对应于不同的传输函数1和2)，所有的原色5、6、7、8可根据图1b和以下表单独产生：
    光源     传输函数     原色
    A     1     蓝色(5)
    B     1     青色(7)
    A     2     黄色(6)
    B     2     红色(8)
大体上，根据本发明的实施例，在WO2004/032523 A1中描述的彩色显示器可以如下方式修改，使用包括频谱可选择LCD层和驱动装置的彩色选择装置来代替在该文献中包括传统彩色滤波器的彩色选择装置，其中所述驱动装置用于将频谱可选择LCD层的像素驱动到不同频谱可选择状态。这意味着像素的整个区域被用于产生一种颜色，而不是子像素的区域。
图2a和2b示意性的说明了根据本发明实施例并且实现了图1a和1b所示普遍原理的彩色显示设备。
图2a说明了彩色显示器12，其被用于显示彩色画面。显示器12包括若干个可单独控制的图像单元，以下称为像素13，其被配置为阵列。图2b示意性地说明了图2a中的显示器的截面图。显示器12包括LCD层14，其依次包括多个层，这将在以下描述。显示器12还包括至少两个光源16、17，他们具有实际上不同的辐射频谱。光源16、17被交替激活(点亮)，从而获得频谱连续显示功能，这将在以下描述。显示器还包括驱动单元18，其能够向LCD发光层14中的图像单元13提供至少两个不同的驱动信号d1，d2。当第一驱动信号d1被提供给像素13时，像素13在第一传输频带传输光。当第二驱动信号d2被提供给像素时，像素在不同于第一传输频带的第二传输频带传输光。
多种光源可被使用，包括HCFL(发热阴极荧光灯)和发光二极管(LED)。图1a中的光源A因此包括蓝色LED和黄色LED，而光源B包括青色LED和红色LED。
LCD层可通过多种方式建立。这种LCD层的一个示例在图3a中示意性地示出，即未扭曲向列LCD层，其本身是公知的。该层14在传播光束20的方向(该波束也可以在相反方向传播)包括指向90°的第一偏光器21，在45°的延迟器22(延迟值d*Δn＝660nm(其中d是厚度以及Δn是双折射值))，在-45°的未扭曲液晶层(d*Δn＝660nm)，以及指向0°的第二偏光器24。
传统LCD效应具有275nm(半波)的有效延迟值，其90°旋转传输光的极化状态，如果偏光器是平行的，则需要暗的像素。然而只要满足以下条件就可以获得这种暗的像素状态
λ 2 n + 1 = d * Δ n 2 ,
其中λ是波长。如果例如在400nm需要暗的状态，这可通过200nm(n＝0)或600nm(n＝1)的延迟值来达到。更高的延迟值导致了更高的波长依赖性。例如，对于稍微不同于400nm的波长，λ/(2n+1)和d*Δn/2之间的差异对于高的n值将更大。因此，如果延迟值很高，在400nm时变暗的状态对于700nm是高度透明的。
图3a示意性地说明的LCD，如上所述具有额外的660nm的延迟器。这意味着应当使用交叉偏光器，提供在0V具有高质量的暗状态。增加电压意味着减少LCD层的延迟并且增加总的延迟值。在低电压时，有效的延迟值很低并且因此传输是非常颜色中立的。在基于所使用的材料和厚度的电压，d*Δn是275nm并且达到亮状态。在更高的电压会产生波长依赖性。
因此未扭曲向列LC层14对于不同的驱动电极电压具有不同的传输频谱，如图3b所示。对于0V(V0)，传输对于所有的波长是0％(黑色)。在增加电压时，传输百分比对于所有波长增加直到在电压(Vw)获得实际的颜色中立即白色状态(d*Δn＝275nm)。根据本发明的实施例，然而驱动电压进一步增加。这使得LC层如上解释的高度波长相关。在第一较高电压(V1)，例如，层主要在低于500nm的第一传输频带传输光。在第二、更高的电压(V2)，代之的是层主要在高于500nm的第二传输频带传输光。
图4a说明了其中本发明的实施例被执行的示例。两个不同的传输频谱(对应于V1和V2)被从图3b中选出，并且被用作LC频谱可选择状态。除了该频谱可选择状态，还使用黑色和白色状态。四个发光二极管26、27、28、29(蓝色、青色、黄色、红色)被用作光源，并且被分别成对激活26、28(实线)和27、29(虚线)。通过这种配置获得了四个原色以及黑色和白色。
图4b说明了图4a的示例的色域。四个原色被标记为黑色斑点。色域对于移动应用被认为是非常广的，比如PDA或移动电话。虚线三角形说明作为对比的NTSC(国家电视系统委员会)彩色三角形。
除了四个原色之外，白色(标记为环形)和十个其它颜色(十字)可被获得，当然还有黑色。因此总共16个颜色可被获得，具有很好的亮度并且使用廉价的具有低复杂度的配置。通过使用多于两个频谱可选择状态，当然在更高复杂度的代价下可获得更多颜色。
图5说明了在根据本发明实施例的显示设备中使用的控制配置。控制配置实现了控制彩色显示设备的方法。控制单元33接收以RGB帧30形式将被显示的画面信息(视频或静止)。控制单元33用于将每个输入帧30划分为第一SF1，31，以及第二SF2，32，子帧，当其一个接一个的显示时，共同给出了RGB帧30的可感知外观。控制单元33通过在使得驱动单元18馈送第一驱动信号d1到LC光阀层14之后点亮第一光源16来显示第一子帧31。控制单元33通过在使得驱动单元18馈送第二驱动信号d2到LC光阀层14之后点亮第二光阀层17来显示第二子帧。寻址方法是公知的。
总的帧长度通常是20ms，其意味着对于每个子帧10nm是可用的。该时间段可以以下方式使用。首先像素被寻址，其在2ms内完成，然后在7ms内系统等待像素响应，即像素达到理想状态。然后光源在1ms内被点亮。
如果接收的信息涉及静止画面，只要画面被显示其就被重复。注意LC光阀层14控制亮度(灰度级)和颜色。给定RGB帧30对应于由两个驱动信号d1、d2给出的使用例如查找表34发现用于每一帧的最有可能的近似。
应当注意的是除了图3说明的未扭曲向列之外的其它LC光阀层可被使用。本领于技术人员可找到多种方式来达到所需要的电压波长依赖性。显示器的最高总延迟值优选的应当大于400nm并且更优选的大于660nm。
在一种变形中，垂直排列的LC层可被使用。该变形可提供实际上与3b中描述的相同的光特性，但是用于不同的驱动电压。该变形的优点是在高电压达到黑色，这意味着相对于上述黑色状态放宽的情况显示器可被驱动到黑色状态。这改善了显示器的切换速度。
在另一种变形中，图3a中的延迟器22被省略。这也把黑色状态置于高驱动电压上。
另一种可设想的变形包括使用OCB(光补偿双折射)模式LCD，其对于本领域技术人员来说是公知的。OCB模式LCD也提供快速切换。
总之，本发明涉及一种彩色显示设备，包括具有不同的辐射频谱的至少两个光源，以及液晶光阀层。光源被被依次激活，并且光阀层被提供以驱动信号使得其获得强的波长依赖性。这允许显示设备在不提供彩色滤波器时产生原色。这提供了比较简单的显示器，适用于移动应用并且提供了高亮度。
本发明不限于所述的实施例。其在权利要求的范围内可以不同的方式更改。

Claims (9)

1.一种用于显示彩色画面的彩色显示设备，其包括：液晶光阀层(14)，具有配置为阵列的若干个图像单元(13)；至少两个光源(16，17)，具有实质上不同的辐射频谱并且被交替激活；以及彩色选择装置，用于与所述光源在所述彩色画面中共同产生原色，其中所述彩色选择装置包括驱动装置(18)，用于向液晶光阀层(14)中的图像单元提供至少第一和第二驱动信号(d1，d2)，使得当接收第一驱动信号(d1)时图像单元在第一传输频带传输光，并且当接收第二驱动信号(d2)时，在与第一传输频带不同的第二传输频带传输光。
2.如权利要求1所述的彩色显示设备，其中液晶光阀层(14)是未扭曲向列液晶层。
3.如权利要求1所述的彩色显示设备，其中的液晶光阀层(14)是OCB模式液晶层。
4.如权利要求1所述的彩色显示设备，其中液晶光阀层(14)是垂直排列的液晶层。
5.如前面任一权利要求所述的彩色显示设备，其中所述光源(16，17)包括不同的发光二极管。
6.如前面任一权利要求所述的彩色显示设备，其中所述光源(16，17)包括不同的荧光灯。
7.如前面任一权利要求所述的彩色显示设备，其中液晶光阀层(14)的延迟值高于400nm。
8.如前面任一权利要求所述的彩色显示设备，其中液晶光阀层(14)的延迟值高于660nm。
9.一种控制用于显示彩色画面的彩色显示设备的方法，该设备包括液晶光阀层(14)和至少两个光源(16，17)，所述液晶光阀层具有配置为阵列的若干个图像单元(13)，所述至少两个光源具有实质上不同的辐射频谱并且被交替激活，该方法包括步骤
向液晶光阀层(14)中的图像单元提供第一驱动信号(d1)使得图像单元在第一传输频带传输光，并且
向图像单元(14)提供第二驱动信号(d1)使得图像单元在不同于第一传输频带的第二传输频带传输光。
CNA2005800230820A 2004-07-07 2005-07-01 彩色显示器 Pending CN1985212A (zh)

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