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Publication numberCN1398392 A
Publication typeApplication
Application numberCN 01804248
PCT numberPCT/US2001/044803
Publication date19 Feb 2003
Filing date29 Nov 2001
Priority date30 Nov 2000
Also published asCN1227640C, EP1337996A2, EP1337996A4, US7088331, US20030098835, WO2002044795A2, WO2002044795A3
Publication number01804248.1, CN 01804248, CN 1398392 A, CN 1398392A, CN-A-1398392, CN01804248, CN01804248.1, CN1398392 A, CN1398392A, PCT/2001/44803, PCT/US/1/044803, PCT/US/1/44803, PCT/US/2001/044803, PCT/US/2001/44803, PCT/US1/044803, PCT/US1/44803, PCT/US1044803, PCT/US144803, PCT/US2001/044803, PCT/US2001/44803, PCT/US2001044803, PCT/US200144803
InventorsEM奥东内尔, BW霍夫曼
Applicant汤姆森许可公司
Export CitationBiBTeX, EndNote, RefMan
External Links: SIPO, Espacenet
Method and appts. for controlling common mode electrode voltage in LCOS/LCD
CN 1398392 A
Abstract  translated from Chinese
一种用于控制液晶显示器中共模电极电压的装置(10),包括至少一个第一传感器(12),用于测量向成象器施加具有预定颜色和驱动水平的视频信号导致的闪烁。 A liquid crystal display device CPC mode electrode voltage (10) for controlling comprising at least one first sensor (12) for measuring a video signal having a predetermined color is applied and the drive level to the image forming device caused by flicker. 用于判定正场探测器电压和负场探测器电压之间的压差的探测器(18)用于提供一个反馈回路,对控制器反馈压差以调节共模电极电压。 Field detector for determining a positive pressure and negative field voltage between the voltage detector detector (18) for providing a feedback loop, the feedback pressure controller to adjust the common-mode electrode voltage.
Claims(20)  translated from Chinese
1.一种控制液晶显示器中共模电极电压的方法,该方法包括步骤:向成象器施加具有预定颜色和驱动水平的视频信号;确定正场探测器电压和负场探测器电压之间的压差;和将压差反馈给控制器以调节共模电极电压。 A method of controlling a liquid crystal display common mode electrode voltage, the method comprising the steps of: applying a color video signal having a predetermined level and drive to the imager; field detector determines positive pressure and negative field voltage between the voltage detector poor; and the pressure feedback to the controller to adjust the common-mode voltage electrode.
2.如权利要求1所述的方法,其特征在于确定步骤还包括使用在图像的过扫描区中的至少一个传感器的步骤。 2. The method of claim 1, wherein the determining step further comprises the step of using an image overscan region of the at least one sensor.
3.如权利要求1所述的方法,其特征在于本方法还包括动态重调节共模电极电压以减少图像滞留的步骤。 The method according to claim, characterized in that the method further comprises the step of dynamically adjusting the common-mode electrode voltage weight to reduce image retention.
4.如权利要求1所述的方法,其特征在于判定步骤还包括使用一个主传感器、次传感器和差分放大器除去环境光所致的共模信号的步骤。 4. The method according to claim 1, wherein the determining step further comprises the step of using a primary sensor, secondary sensor, and a differential amplifier to remove the ambient light-induced common-mode signal.
5.如权利要求1所述的方法,其特征在于确定压差的步骤还包括利用一个输出指示通用电极电压变化的方向的选通比较器的步骤。 5. The method of claim 1, wherein the step of determining the pressure differential comparator further comprises gating an output indicative of the use of common electrode voltage changes the direction of the step.
6.如权利要求1所述的方法,其特征在于确定压差的步骤还包括利用传感器的步骤。 6. The method of claim 1, wherein the determining step further comprises the step of differential pressure sensor use.
7.如权利要求1所述的方法,其特征在于确定压差的步骤还包括测量由于施加的视频信号导致的闪烁的步骤。 7. The method of claim 1, wherein the determining step further comprises measuring the differential pressure of the step due to a video signal applied to flickering caused.
8.一种用于控制液晶显示器中共模电极电压的装置,该装置包括:一个探测器,用于确定正场探测器电压和负场探测器电压之间的压差;和一个反馈回路,用于将压差反馈给控制器以调节共模电极电压。 8. A method for controlling a liquid crystal display device common mode electrode voltage, the apparatus comprising: a detector for determining a positive pressure and negative field voltage field detector between the detector voltage; and a feedback loop, with in the pressure feedback to the controller to adjust the common electrode voltage-mode.
9.如权利要求8所述的装置,其特征在于所述装置包括主光电传感器和次光电传感器,其放置在图像的过扫描区中,相隔短的距离。 9. The apparatus according to claim 8, characterized in that said photosensor means comprises primary and secondary photoelectric sensor, which is placed in the image overscan region, separated by a short distance.
10.如权利要求8所述的装置,其特征在于装置包括放置在没有过扫描的系统中多个折叠反射镜之下的主光电传感器和次光电传感器。 10. The apparatus according to claim 8, characterized in that the apparatus comprises a plurality of main photovoltaic sensors placed folding mirror and the second photosensor under no overscan system.
11.如权利要求8所述的装置,其特征在于装置还包括显示器中的针孔,以允许有充足的光到达至少第一传感器。 11. The apparatus according to claim 8, characterized in that the apparatus further comprises a display in the pinhole to allow sufficient light to reach at least a first sensor.
12.如权利要求8所述的装置,其特征在于探测器包括一个选通的比较器,该比较器的输出表示通用电极电压变化的方向。 12. The apparatus according to claim 8, characterized in that the detector comprises a gating comparator which compares the output of common electrode voltage indicates the direction of change.
13.如权利要求8所述的装置,其特征在于装置还包括一个具有预定的强度水平的光源,用于根据输入到液晶显示器成象器的视频对至少第一传感器照明。 13. The apparatus according to claim 8, characterized in that the apparatus further comprises an intensity having a predetermined level of a light source for a liquid crystal display according to an input to the imager for at least a first video sensor illumination.
14.如权利要求8所述的装置,其特征在于用于确定压差的探测器包括至少一个第一传感器,用于测量由对成象器施加具有预定颜色和驱动水平的视频信号所导致的闪烁。 14. The apparatus according to claim 8, wherein the means for determining at least one differential pressure detector comprises a first sensor for measuring a video signal by applying a predetermined color and having a drive level of the image forming device caused by flashes.
15.一种用于控制液晶显示器中共模电极电压的装置,包括:一个偏振光源,具有预定的强度水平,用于经过液晶盒至少对第一传感器照明;和一个探测器,响应于第一传感器的输出提供反馈信号,从而对液晶盒调节共模电极电压。 15. A liquid crystal display of the common mode electrode voltage control means, comprising: a polarized light source, having a predetermined intensity level, for at least a liquid crystal cell through a first sensor for illumination; and a detector, responsive to the first sensor The output provides a feedback signal to adjust the common-mode liquid crystal cell electrode voltage.
16.如权利要求15所述的装置,其特征在于装置还包括放置在盖玻璃上的反射镜,将辐射反射并导向至少第一传感器。 16. The apparatus according to claim 15, characterized in that the apparatus further comprises a cover glass is placed on a mirror, and guide the radiation reflecting at least a first sensor.
17.如权利要求16所述的装置,其特征在于至少第一传感器和探测器集成到液晶显示器的背平面上。 17. The apparatus of claim 16, wherein at least a first sensor and a detector integrated on the back plane of a liquid crystal display.
18.如权利要求16所述的装置,其特征在于所述的至少第一传感器是一个集成到LCOS显示器背平面上的光电传感器,辐射源是一个发光二极管,探测器集成到背平面。 18. The apparatus of claim 16, wherein at least said first sensor is a photosensor LCOS display integrated into the back plane, the radiation source is a light emitting diode, the detector is integrated into the back plane.
19.如权利要求15所述的装置,其特征在于辐射源和所述至少第一传感器被调谐到不可视波长。 19. The apparatus of claim 15, wherein said at least a first radiation source and the sensor is tuned to a non-visible wavelengths.
20.如权利要求15所述的装置,其特征在于所述至少第一传感器是放置在LCOS的电未调制区之上的盖玻璃的顶盖上的光电二极管,以检查零电压(未调制)点和/或放置在环电极的盖玻璃的顶盖上以检查电光传递函数上的最大电压点的另一个光电二极管的至少一个,其中探测器利用来自光电二极管的电压选择正确的共模电极电压。 20. The apparatus according to claim 15, characterized in that said at least first sensor is a photodiode placed on the electrical LCOS unmodulated area of a cover glass of the top cover, to check the zero voltage (unmodulated) points and / or placed on the cover glass of the top cover ring electrode electro-optical inspection is passed to the maximum voltage of the photodiode to another point on the at least one function, wherein the common-mode electrode voltage detector utilizes the voltage from the photodiode to select the correct .
Description  translated from Chinese
控制LCOS/LCD中共模电极电压的方法和装置 Control LCOS / LCD method and apparatus for common mode voltage of the electrode

发明背景技术 Background of the Invention

领域本发明配置涉及LCOS(硅上的液晶)和/或LCD(液晶显示器)视频投影系统领域。 The present invention relates to the configuration LCOS (liquid crystal on silicon) and / or LCD (liquid crystal display) video projection systems. 尤其涉及自动调节LCOS/LCD投影系统中共模电极电压。 More particularly, to automatically adjust the LCOS / LCD projection system common mode voltage electrode.

相关技术的描述在LCOS系统中,需要对象素把共模电极电压精确地设置到正负驱动电压之间。 Description of the related art in LCOS systems, the need for the pixel electrode to the common mode voltage between the positive and negative accurately set to the driving voltage. 典型地通过首先发送个标准帧以及之后的反向帧而利用两倍帧信号,响应于给定的输入图像驱动LCOS显示器的成象器,从而避免30HZ的闪烁,在标准帧中与每个盒相连的电极电压相对于公共电极的电压为正(正图像),在反相帧中与每个盒相连的电极电压相对于公共电极的电压为负(负图像)。 Typically by first transmitting reverse frame and subsequent frames and the use of twice the standard frame signal, in response to a given input image display drive LCOS imager, thereby avoiding flicker 30HZ in the standard frame and each cartridge electrodes connected to the voltage with respect to the common electrode voltage is positive (positive image), electrode voltage at the inverting each cartridge is connected to the frame with respect to the voltage of the common electrode is negative (negative image). 共模电极电压表示为VITO,其中后面的字母ITO表示氧化铟锡,即LCOS晶片的电极基底处的电压由这些材料制成。 Common-mode electrode voltage as VITO, wherein the following letter indicates ITO indium tin oxide, i.e., the voltage at the base electrode is made of a wafer LCOS these materials. 以这种方式设置VITO避免闪烁和图像滞留,而闪烁和图像滞留反过来会影响器件的寿命。 VITO set in this manner to avoid flicker and image retention, and flicker and image retention, in turn, will affect the life of the device. 由于现在是通过开环控制完成此设置,故有在VITO中出现误差的以及随时间和温度变动的机会。 Because it is through open-loop control to complete this setting, and so there is the opportunity over time and temperature changes in the error appears in the VITO.

现有技术的典型实施是使用一个开环DAC(数字模拟转换器),从而允许利用一个快光电二极管拾取器调节VITO以及利用一个示波器和一个控制器进行视觉校准。 A typical embodiment of the prior art is the use of an open loop DAC (digital to analog converter), thereby allowing the use of a fast photodiode pickup adjusting VITO and use an oscilloscope and a controller for visual calibration.

LCOS现有技术状态需要调节共模电极电压,以便对LCOS匹配正负场驱动。 LCOS need to adjust the state of the art common-mode voltage electrode in order to match the positive and negative field LCOS drive. 要将闪烁减到最小以及避免已知的“图像暂留”现象,平衡是必需的。 To minimize flicker and avoiding known "image sticking" phenomenon, the balance is required. 为了避免可视的闪烁,一般可行的是利用较高的帧速率、典型的为120Hz来抑制闪烁。 In order to avoid visible flicker, generally feasible is to use a higher frame rate, typically 120Hz to suppress flicker. 但是,较高的帧速率使得调节共模电极电压更困难,因为人眼看不到闪烁。 However, a higher frame rate makes it more difficult to adjust the common-mode voltage electrode, because the human eye can not blink. 操作者可以进行必需的调节。 The operator can make the necessary adjustment. 这可以利用光电二极管或其它的快速探测器以及平衡输出的AC成分而克服。 This can be overcome by the photo diode or other fast detector and a balanced output of the AC component. 不幸的是,这种开环调节由于系统中的热效应而显得不足。 Unfortunately, this open-loop adjustment due to thermal effects in the system and inadequate.

因此,存在以自动考虑系统中的热效应的方式控制LCOS/LCD中共模电极电压并克服由于较高的帧速率而不能进行手工调节的不足的需要。 Accordingly, there is an automatic system in consideration of thermal effects in the way the control LCOS / LCD common mode electrode voltage and to overcome the higher frame rate can not be less need for manual adjustment.

发明概述根据本发明的装置,在系统中至少使用一个传感器,以便利用反馈以连续的方式进行共模电极调节。 Summary of the invention apparatus according to the invention, in the system using at least one sensor, in order to use feedback in a continuous manner common mode electrode adjustment. 这可以根据本发明的装置以几种方式实现。 This can be achieved in several ways apparatus according to the invention. 第一系统水平的实施在图像的总扫描区放置一个或多个传感器。 Embodiment of the first system level is placed one or more sensors in the total scanning area of the image. 最好把具有适当颜色和驱动水平的视频信号施加到成象器以测量闪烁。 Preferably applying a video signal having a level appropriate to the color and drive imager to measure scintillation. 然后可以对底架微处理器编程以读出正负场探测器电压并决定正负场探测器电压之差。 Chassis microprocessor can then be programmed to read the sign and decided to field detector voltage detector voltage difference between the positive and negative field. 此差值可以有利地用于反馈以调节共模电极电压。 This difference may be advantageously used in a feedback to adjust the common-mode electrode voltage. 此反馈避免了由于不正确的共模电压在初始上电时对成象器的损坏的可能性。 This avoids the possibility of feedback due to incorrect common-mode voltage at the initial power of the imaging device damaged. 此反馈还确保动态地重调节共模电极以减小图像滞留。 This feedback also ensures that dynamically adjust the total weight of the electrode to reduce image retention mode.

在本发明的另一个目的中,用于控制液晶显示器中共模电极电压的装置包括一个偏振光源和一个探测器,偏振光源具有预定的强度水平,经过液晶盒至少对第一传感器照明,探测器对液晶盒提供反馈信号,从而调节共模电极电压。 In another object of the present invention, for controlling a liquid crystal display device CPC mode electrode voltage includes a polarized light source and a detector, the intensity of polarized light source having a predetermined level, the liquid crystal cell through at least a pair of first illumination sensor, detector pairs liquid crystal cell provides a feedback signal to adjust the common-mode voltage electrode.

附图简述图1是根据本发明的配置自动控制共模电极电压的分散的设施示意图;图2是根据本发明的配置自动控制共模电极电压的集成的设施示意图;图3是根据本发明的方法的流程图。 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of the common mode electrode voltage facilities dispersed according to the configuration of the automatic control of the present invention; Figure 2 is a schematic view of an integrated facility of the common mode electrode voltage according to the configuration of the automatic control of the present invention; FIG. 3 is according to the present invention a flowchart of a method.

详细描述本优选实施例的框图如图1所示。 A block diagram of the preferred embodiment described in detail as shown in Fig. 本实施例10采用两个传感器避免环境光排斥的问题,其中主传感器用标号12表示,次传感器用标号14表示。 The present embodiment uses two sensors 10 to avoid the problem of ambient light rejection, wherein reference numeral 12 denotes the primary sensor, secondary sensor represented by reference numeral 14. 两个传感器之间的差分感应要减去由于环境光的共模信号。 Differential induction between the two sensors to be subtracted due to the common mode signal ambient light. 两个传感器可以放置在图像过扫描区中相距很短的距离(例如1-2英寸)。 Two sensors can be placed in the image overscan region apart a short distance (e.g., 1-2 inches). 或者,传感器可以放置在光路中其它的位置,包括折叠镜下,其中该折叠反射镜主要存在于没有过扫描的系统情形下的电视机壳中。 Alternatively, the sensor may be placed in other positions in the optical path, including a folding microscope, wherein the folding mirror is mainly present in the case of television chassis system not under the overscan. 针孔将各允许足够的光到达探测器,其中该针孔既可以是有意制作的,也可以是自然存在的。 Each pinhole allow sufficient light to reach the detector, wherein the pinhole is either deliberately made to be a naturally-occurring. 传感器12和14之间的差分感应最好通过取传感器的各自输出并将它们缓存在各个缓存器13和15中、并利用缓存的输出作为对差分放大器16的输入而实现。 Differential inductive sensor is preferably between 12 and 14 by taking the output of each sensor at each of them cache buffers 13 and 15, and using the output buffer of the input of the differential amplifier 16 is implemented as. 差分放大器16的输出充当对探测器18的输入,其被反馈给系统微处理器19,以便调节共模电极电压。 The output of the differential amplifier 16 and an input of the detector 18, which is fed back to the system microprocessor 19, in order to adjust the common-mode electrode voltage. 探测器18最好是选通的并由微处理器控制。 Detector 18 is preferably gated by the microprocessor control. 当微处理器19从探测器18抽样信号时指示选通脉冲,并且光的颜色用作对探测器18照明。 When the microprocessor 19 indicating strobe sampling signal from the detector 18, the color and the light detector 18 is used as illumination. 这样允许系统只对红、绿和蓝成象器使用一个传感器并从反向的和非反向的场中顺序地感应光。 This allows the system uses only one sensor for red, green and blue light from the image forming device and sensing non-inverted and inverted field sequentially.

“信号”传感器12可以根据输入到成象器的视频以预定的光强度水平交替地照明。 "Signal" sensor 12 may be a predetermined light intensity level are alternately input to the image forming device according to the illumination of the video. 反向的和非反向的场之间的光亮水平之差被发送给探测器18以确定共模电压是太高还是太低。 Reverse light level of the field and the difference between the non-inverted is transmitted to the detector 18 to determine the common mode voltage is too high or too low. 传感器12将探测到反向和非反向场之间光输出的变化。 Sensor 12 will detect changes in light output between the inverting and noninverting fields. 这种光输出的变化是由DC非平衡导致的反向和非反向帧之间LC单元上的RMS电压中轻微的变化所致。 This change is caused by the light output of the RMS voltage on the LC cell between the inverting and noninverting frames caused by the unbalanced DC slight variations. 此变化的大小受共模电极控制。 This change in size is limited by the common mode electrode control. 控制微处理器19可以决定是否需要共模电极电压变化。 Control microprocessor 19 can decide whether to change the common electrode voltage mode. 这可以以对于每个成象器颜色有多个传感器的并行模式进行,也可以以通过改变产生照明的成象器的顺序模式进行。 This may be for each color image forming device has a plurality of sensors in parallel mode, or may be generated by changing the order of the image forming mode lighting device will be. 因为系统的响应时间将有意地减慢以避免响应噪音,所以最好基于较低的成本优选该顺序的系统。 Since the response time of the system will intentionally slow down the response to avoid the noise, so the best low cost is preferably based on the system of the sequence.

可以有多种类型的探测器和方法用于执行本发明,但最简单的并且也可能是最有效的是一种选通比较器,其输出表示改变共模电极电压的方向。 There can be multiple probes and methods for carrying out the present invention, but the simplest and probably the most effective is a gated comparator whose output indicates the common-mode electrode voltage changes direction. 控制微处理器轮询(探测器内的)比较器的位,寻找从低到高的转变。 Control microprocessor polling bit comparator (detector inside), looking from the low to high transition. 一旦探测到从低到高的转变,微处理器即确定在相反方向上的步骤产生从高到低的转变,并且因此实现目标电压。 Upon detection of the transition from low to high, i.e., the microprocessor determines in the opposite direction of the step of generating high to low transition, and thus to achieve a target voltage. 象期望的那样,需要某种程度的基于滞后和均化的软件。 As expected, the need-based software lag and homogenized to some extent. 可以采用更复杂的探测器,如A/D转换器或其它的数字处理,但考虑到成本效益,目前很少使用。 More complex detectors can be used, such as A / D converters or other digital processing, but taking into account cost-effectiveness, is rarely used.

作为一个附加的特征,为了迅速会聚,探测器18的增益减小和在软件中步进搜索大小的增大是理想的。 As an additional feature, in order to quickly converge, the detector 18 is reduced and the gain of the step size of the search is increased in the software is desirable.

同样有效的另一实施例是可以集成到成象器、由此避免环境光亮导致的问题的情形。 Another equally effective embodiments can be integrated into the image forming device, thereby avoiding problems caused by the case of the bright environment. 可以把例如为光电二极管的传感器放置在LCOS和/或“环电极”的电未调节区之上的盖玻璃的顶上。 Can be, for example, a photodiode sensor placed in LCOS, and / or electrical "ring electrode" unmodulated area above the cover glass on top. “环电极”在LCOS装置中是一个通称。 "Ring electrodes" in LCOS device is a generic term. 一般地,象素反射镜之外的LCOS显示器的非有源区是一个单独的大板。 In general non-active region, outside the pixel mirror LCOS display is a single large plate. 此大板与象素的其余部分一样是反射性的,但有非常大的面积,因而具有比其它象素高的电容值。 This large plate with the rest of the pixels as is reflective, but has a very large area, thereby having a high capacitance value than the other pixels. 环电极也主要被驱动黑色以便抑制来自照明系统的碰到光学元件上的杂散光。 Ring electrode mainly driven so as to suppress stray light black elements encountered from the illumination optical system on. 固有地需要杂散光或照射到环电极区的光以提供光学系统中的组装容差,使得在需要时光将适宜地照射到显示器所有的可视区。 Inherently require light or stray light is irradiated to the ring electrode area to provide an optical system assembly tolerance, so that the time required to suitably irradiated to display all of the visible region. 在LCOS显示器的可视区中“环电极”不需要象象素那样以很高的速度调制,因此可以由低带宽放大器驱动,并且出于本实施例的目的,可以在简短的时间周期和稍高于黑色的水平驱动,而不会由于碰撞到光学元件上而导致任何可感觉的光量。 In LCOS displays the visible area "ring electrode" is not required as the pixel as a very high speed modulation, and therefore may be driven by a low-bandwidth amplifiers, and for purposes of this embodiment, in a short period of time and slightly higher than the black level of the drive, without a collision on the optical element caused by the light amount of any perceptible. 因此,这些传感器可以用于检查电光传递函数中的零电压点(未调制)和最大电压点(环电极)。 Therefore, these sensors can be used to check the electro-optical transfer function of the zero voltage point (unmodulated) and the maximum voltage point (ring electrode). 然后可以把来自光电二极管的探测器电压用于选择正确的共模电极电压。 Voltage from the detector can then be used to select the correct photodiode common mode electrode voltage. 此实施例的缺点在于需要传感器的精确放置。 The disadvantage of this embodiment is that the need for precise placement of the sensor.

本发明更高集成的实施例示于图2。 The present invention is more highly integrated embodiment shown in Fig. 在本例中,装置20包括放置在LCOS装置周围的感应单元或光电探测器26以及用作照明源的LED22。 In the present embodiment, the apparatus 20 comprises a LCOS device placed around the sensor element or photodetector 26, and used as an illumination source LED22. 在盖玻璃上放置一个小反射镜24以将LED光反射回到光电探测器26,其也形成在LCOS的背平面上。 A cover glass is placed on a small mirror 24 to the LED light reflected back into the photodetector 26, which are also formed on the back plane LCOS. 传感放大器和反馈电路(未示出)也集成在背平面上。 The sense amplifier and a feedback circuit (not shown) is also integrated on the back plane. 如在前面的实施例中那样,传感器的输出最好缓存在至少一个缓存器(27)中,并且把缓存的输出用作对探测器28的输入,其馈送到系统微处理器29。 As in the previous embodiment in that the sensor output is preferably at least one of the cache buffer (27), and the buffer output is used as input to the detector 28, which is fed to the microprocessor system 29. 探测器28的另一项输出也充当对微处理器29的选通脉冲,与关于对微处理器19的选通脉冲的描述一样。 Another output of the detector 28 also acts as a gate pulse to the microprocessor 29, and on to the microprocessor 19 strobes the same description. 此方法的优点在于由于在成象器大的硅区域上的集成,使成本降低,并且提高了对环境光干扰的抗扰力。 The advantage of this method is that due to the image forming device are integrated on a large silicon area, reduce costs, and improve the environmental light interference immunity force. 如果希望避免对比度的损耗,LED发射器和传感器还可以在不可视波段(如红外)调谐。 If you want to avoid the loss of contrast, LED emitters and sensors may also be non-visible bands (e.g. infrared) tuning. 在本实施例中,测量探测器28的输出电压以在共模电极电压中进行相应的变化。 In the present embodiment, the measurement probe 28 to the output voltage corresponding change in the common mode electrode voltage. 光电二极管探测器(28)的输出电压与落在传感器26上的光功率成比例。 26 is proportional to the optical power on the photodiode detector (28) and falling on the sensor output voltage. 从长远看,此集成将提供最低的成本配置。 In the long run, this integration will provide the lowest cost configuration.

参见图3,图中示出了一种控制液晶显示器中共模电极电压的方法。 Referring to Figure 3, there is shown a method of controlling a liquid crystal display of the common mode electrode voltage. 最好该方法50包括在方框52处向成象器施加具有预定颜色和驱动水平的视频信号和在方框54处测量施加视频信号导致的闪烁的步骤。 Preferably, the method 50 comprises applying a color video signal having a predetermined level and drive to the imager at block 52 and the video signal resulting from the step of applying a flicker measurement at block 54. 方框56中的方法50确定了正场探测器电压和负场探测器电压之间的压差,并在方框58处将压差反馈到控制器以调节共模电极电压。 In block 56 the method 50 determines the pressure differential positive and negative field voltage field detector between the detector voltage, and at block 58 the pressure feedback to the controller to adjust the common-mode electrode voltage. 确定步骤可以以多种方式实现。 Determining step may be achieved in various ways. 例如,在图像的过扫描区中使用至少一个传感器或利用一个主传感器、次传感器和差分放大器除去由环境光所致的共模信号,或利用一个输出指示通用电极电压变化的方向的选通比较器。 For example, using at least one sensor or with one sensor in the main image overscan region, the secondary sensor and a differential amplifier strobe Comparative removed by ambient light due to the common mode signal, or the use of a common electrode voltage output indicates a direction of change device. 该方法还可以包括动态重调节共模电极电压以减少图像滞留的步骤。 The method may further include dynamically adjusting the weight to reduce the common-mode electrode voltage step of image retention.

虽然本发明已结合实施例进行了描述,但应该理解,前面的描述只出于举例说明的目的,并不限定由权利要求定义的发明范围。 While the invention has been described in connection with an embodiment, it is to be understood that the foregoing description is for illustrative purposes only, and is not limited by the scope of the invention defined by the claims.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
CN100458526C9 Jan 20064 Feb 2009富士机械制造株式会社Adjusting device for liquid crystal display
CN100472812C20 Dec 200425 Mar 2009汤姆森特许公司Image display screen and method for controlling said screen
Classifications
International ClassificationG02F1/133, G09G3/20, G09G3/00, G09G3/36
Cooperative ClassificationG09G3/3614, G09G3/3659, G09G2360/145, G09G3/002, G09G2320/0247, G09G3/3655, G09G2320/029, G09G2320/0204
European ClassificationG09G3/36C8M, G09G3/00B2, G09G3/36C8C
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19 Feb 2003C06Publication
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16 Nov 2005C14Granted