WO2010083740A1 - 微型投影机的驱动装置及驱动方法 - Google Patents

微型投影机的驱动装置及驱动方法 Download PDF

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Publication number
WO2010083740A1
WO2010083740A1 PCT/CN2010/070162 CN2010070162W WO2010083740A1 WO 2010083740 A1 WO2010083740 A1 WO 2010083740A1 CN 2010070162 W CN2010070162 W CN 2010070162W WO 2010083740 A1 WO2010083740 A1 WO 2010083740A1
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Prior art keywords
light source
image
light
driving
driving device
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PCT/CN2010/070162
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English (en)
French (fr)
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权星泽
金东侠
金城守
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上海三鑫科技发展有限公司
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Priority to US13/146,154 priority Critical patent/US8773348B2/en
Publication of WO2010083740A1 publication Critical patent/WO2010083740A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/12—Projectors or projection-type viewers; Accessories therefor adapted for projection of either still pictures or motion pictures
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/312—Driving therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3173—Constructional details thereof wherein the projection device is specially adapted for enhanced portability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3197—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using light modulating optical valves

Definitions

  • a pico projector is a portable device of the size of a cigarette case that utilizes a certain amount of light emitted by a light source to magnify an image produced by a display device such as a light modulator onto a front screen.
  • the optical engine which is the core component of the micro-projection device, is a power-hungry piece. How to reduce the power consumption of the optical engine is very important. Especially for those optical engines that use liquid crystals, the power consumption of the light source is quite large, so it is necessary to reduce the power consumption.
  • Contrast Contrast Ratio, referred to as "CR” for short, is the ratio between the brightness of all whites and the brightness of all blacks. If the contrast is high, the image will be displayed more clearly, so contrast is a very important indicator for pico projectors.
  • a driving device for a display device including a light modulator for displaying an image and a light source for illuminating the light modulator, the driving device being used for Controlling the light source and driving the light modulator, the driving device comprises:
  • a detecting unit configured to select pixel data of a specific position in the first image signal and the last image signal in the set time period
  • a reading unit configured to compare the pixel data detected in the first image signal with the pixel data detected in the last image signal
  • a conversion unit configured to convert the interpretation result information of the interpretation unit into a standard signal for adjusting the light source amount
  • the light source adjusting unit is configured to adjust the light quantity of the light source according to the standard signal output by the converting unit.
  • An embodiment of the present invention also provides a pico projector comprising the driving device according to any one of the above items to 6 above.
  • Embodiments of the present invention also provide a micro projector light source driving method, including the following steps:
  • the light source uses the first driving power
  • the light source uses the second driving power
  • the first driving power is higher than the second driving power.
  • the pixels participating in the comparison are randomly selected in each area, which greatly reduces the amount of calculation and has relatively high accuracy.
  • FIG. 1 is a simplified schematic view showing a driving process of a pico projector according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of a system driving device in a first embodiment of the present invention
  • Figure 3 is a simplified schematic view of the structure of the micro-projection device
  • Figure 5 is a diagram showing a specific pixel position distribution in another comparison of the first embodiment of the present invention.
  • Fig. 6 is a flow chart showing an outline of a micro projector light source driving method in a second embodiment of the present invention.
  • a first embodiment of the invention relates to a driving device.
  • the drive device is for a display device comprising a light modulator for displaying an image and a light source for illuminating the light modulator, the drive device for controlling the light source and driving the light modulator.
  • the display device is a micro-projection device.
  • other display devices may be used as long as the display device includes a light modulator and a light source.
  • FIG. 3 is a schematic view showing the structure of a micro projection apparatus.
  • the light emitted by the light source (40) is collected by the collecting lens (70) and incident on the light modulator (60); the light modulator (60) uses the incident fixed amount of light to utilize the transmittance or The reflectance is adjusted; finally, the desired brightness and contrast are obtained, and the image formed by the light modulator is enlarged by the projection lens (80) and projected onto the screen (90); finally, the final image can be seen by the user. Therefore, the brightness and contrast of the image displayed on the screen is completely dependent on the amount of light emitted by the light source (40).
  • the light source must not only be small in size, but also capable of forming high-energy light.
  • the light source that can meet these requirements is a laser light source and a light-emitting diode (Low Emitting). Diode, referred to as "LED”) light source. Both of these are light sources that emit high amounts of light in the small size and low power consumption, but lasers have relatively higher energy efficiency, and LEDs have the advantage of lower prices. Lasers and LEDs can also be combined to form a hybrid (Hybrid) source.
  • the contrast requirements are different.
  • the contrast of still images is more demanding than the contrast of video images.
  • Traditional projectors are dedicated to pictures and video, depending on the application.
  • the contrast is pre-set according to the respective use, but the pico projector is carried by the user and used in various occasions, and may be used to display pictures or may be used to play video.
  • the embodiment of the present invention adds a function of automatically converting the corresponding contrast depending on whether the projected image is a still picture or a video image.
  • a method of adjusting the driving power is taken.
  • One of the ways to adjust the driving power is to increase the driving power of the light source and increase the brightness of the white light.
  • the contrast is moderately reduced.
  • the so-called normal state is set as the highest light source output amount, and under the video condition, the light source output is lowered to 80% of the normal state to reduce the power consumption mode;
  • the opposite scheme is applied, that is, the modest light output is set to the normal state, and the light output is increased to 120% when it is required to project a still image.
  • Frame rate of light modulator is usually 60 Hz or more, because the frequency of human recognition by the naked eye is preferably more than 60 Hz. Therefore, it is necessary to refresh the image signal about 60 times per second.
  • a period of a certain unit is set, in which the image signal of the frame is compared to be able to distinguish whether it is a still image or a video image.
  • the image signals are compared by setting an interval period of 60 frames.
  • the image signal of the first frame is compared with the image signal of the 60th frame, and if it is not changed, it is determined as a still image, and if there is a change, it is determined as a video image.
  • other time segments can also be selected according to actual application conditions, such as 30 frames, 45 frames, 70 frames, and the like.
  • the best method is to take specific pixel data in the image signal as a sample. Assuming that the resolution is VGA format, it has 640 ⁇ 480 pixels, so when comparing the pixel data in the frame between 60 frames:
  • 161-320, 321-480 is divided into three sections;
  • the pixel data of the same position is selected in the 60th frame thereafter, and the phase comparison and interpretation are performed. These sampling comparison points are not fixed at a time, but are selected randomly within 9 zones. Therefore, it is necessary to set the software of the random function in the detecting unit (detecting unit) that selects pixel data in the image signal.
  • the position of a particular pixel at a certain comparison may be the distribution of FIG. 4, and the position of a particular pixel at the next comparison may be the distribution of FIG.
  • the pixels participating in the comparison are randomly selected in each area, which greatly reduces the amount of calculation and has a relatively high accuracy.
  • a specific pixel can also be selected in other manners, for example, N pixels can be randomly selected in the full screen, or M pixels can be randomly selected into 4 regions, or in a specific application according to the screen.
  • the feature selects a number of pixels and the like at a fixed position, where M and N are positive integers.
  • the light modulator (60) refers to an element that selectively passes incident light, blocks or changes the optical path to form an image.
  • a typical example of a light modulator (60) is a digital micromirror device (Digital Micromirror Device (“DMD”), Liquid Crystal Display (“LCD”) components, liquid crystal on silicon (Liquid) Crystal On Silicon, referred to as "LCOS” and so on.
  • DMD Digital Micromirror Device
  • LCD Liquid Crystal Display
  • LCOS liquid crystal on silicon
  • DMD is used in digital light processing (Digital Light Processing, referred to as "DLP"), which uses the field timing (field) Sequential), using a digital mirror arranged in the same number of pixels as the number of pixels (DIGITAL MIRROR).
  • DLP refers to a projector that uses light from a light source to adjust the optical path with a digital mirror and reflects it with a spacer to achieve Gradation or image formation.
  • a liquid crystal display element refers to an element that selectively turns on/off a liquid crystal to form an image.
  • the direct-view projection is a method in which the background light behind the liquid crystal display element forms an image through the LCD panel and can be directly observed;
  • the projection type projection is to enlarge an image formed by the liquid crystal display element by using a projection lens and project it onto the screen, and observe the slave screen.
  • the way of reflecting the image; the reflective type is basically the same as the projected type, except that the reflective type is provided with a reflective film on the substrate under the LCD, and the reflected light is amplified and projected onto the screen.
  • LCOS is a reflective liquid crystal display, which converts the lower substrate of the two-sided substrate of the conventional liquid crystal display end from a transparent glass to a silicon substrate, thereby operating in a reflective manner.
  • the above-described pico projector driving device can be used on the above various display panels.
  • the projection lens (80) is composed of a plurality of lenses, and an image formed by the light modulator (60) is enlarged and projected onto the screen (90).
  • Figure 1 is an example of a field timing (field) in accordance with the present invention.
  • Sequential A simplified schematic of a drive unit in a pico projector.
  • the driving device of the pico projector is composed of an image processor (10), a control chip (20), a light source driver (40), a frame buffer (50), a light modulator (60), and the like.
  • the image frame is input to the control chip (20) through the image processor (10), and the control chip is played with the display processor (Video Processor) has the same effect.
  • the display processor Video Processor
  • LED light or laser light of R (red) G (green) B (blue) can be used.
  • High-pressure mercury lamps or fluorescent lamps have previously been used as light sources, but high-pressure mercury lamps or fluorescent lamps are difficult to adjust the amount of light, while LEDs and lasers are relatively easy to adjust the amount of light, and thus the present invention is easily applicable.
  • Field sequential is a kind of frame time (Frame Time) is divided into three blocks, which are divided into Red (Red) / Green (Green) / Blue (Blue) sub-frames, and drive the display mode of the image data of each color in each sub-frame period. Therefore, the frame rate at this time (Frame The rate is 180 Hz, and the human eye combines the various colors of light to recognize a complete color image. For this reason, as shown in FIG. 1, when the image of the n-1th order is driven in the display panel, the image signal input of the nth sequential frame entering the image processor is temporarily carried in the frame buffer (Frame). Buffer). In this embodiment, three light sources are taken as an example.
  • the light source may be other numbers, for example, one or the like.
  • the light modulator divides the time of one frame into K segments, and each segment displays an image signal corresponding to one light source, where K is a positive integer.
  • the driving chip drives the light source driver to cause the light source to emit light in conjunction with the light modulator.
  • a pixel detecting unit that samples pixel data of a certain frame (first frame and sixtieth frame) from a frame buffered image signal and stores it in the memory is provided. And comparing the pixel data of the first image frame signal with the pixel data of the sixtieth image frame signal to determine whether the matching unit is the same, and converting the light source converting unit into the light source converting standard signal according to the determined information In order to achieve different light source driving states in still images and video images.
  • the detecting unit, the reading unit, and the converting unit are embedded in a display processor (On-chip). Processor) Control chip (Control) Among the IC). It can be understood that the detecting unit, the interpreting unit and the converting unit are all logical units, and the physical implementation form can be various, and besides being embedded in the control chip in an on-chip form, a separate chip can also be used. Implemented, or implemented in software.
  • the light source driving is adjusted according to a preset light source driving condition, thereby achieving an optimal configuration of power consumption.
  • a second embodiment of the present invention relates to a micro projector light source driving method, the flow of which is shown in FIG.
  • step 601 it is determined whether the image currently being played is a still image or a video image.
  • step 602 is entered and the light source uses the first drive power.
  • step 603 is entered and the light source uses the second drive power.
  • the first driving power is higher than the second driving power.
  • the second driving power is approximately 75% to 85% of the first driving power, and may of course be other proportional relationships.
  • the second drive power is 80% of the first drive power.
  • step 601 further includes the following sub-steps:
  • the pixel data of a specific position in the first image frame signal and the last image frame signal is selected in a set time period (e.g., an interval period of 60 frames).
  • the pixel data detected in the first image frame signal is compared with the pixel data detected in the last image frame signal, and if they are the same, they are still images, and if they are different, they are moving images.
  • the specific position means that the image is divided into three equal parts in the horizontal and vertical directions, and is divided into nine areas, and one pixel position is randomly selected as a specific position in each area.
  • specific pixels may also be selected in other manners, for example, N pixels may be randomly selected in a full screen, or M pixels may be randomly selected in each of 4 regions, or in a specific application. A plurality of pixels and the like are selected at a fixed position according to the characteristics of the picture, where M and N are positive integers.
  • the first embodiment is an apparatus embodiment corresponding to the present embodiment, and the present embodiment can be implemented in cooperation with the first embodiment.
  • the related technical details mentioned in the first embodiment are still effective in the present embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related art details mentioned in the present embodiment can also be applied to the first embodiment.
  • the method embodiments of the present invention can be implemented in software, hardware, firmware, and the like. Regardless of whether the invention is implemented in software, hardware, or firmware, the instruction code can be stored in any type of computer-accessible memory (eg, permanent or modifiable, volatile or non-volatile, solid state Or non-solid, fixed or interchangeable media, etc.).
  • the instruction code can be stored in any type of computer-accessible memory (eg, permanent or modifiable, volatile or non-volatile, solid state Or non-solid, fixed or interchangeable media, etc.).
  • the memory can be, for example, a programmable array logic (Programmable) Array Logic ("PAL” for short), Random Access Memory (“RAM”) Programmable Read Only Memory (“PROM”), read-only memory (Read-Only) Memory, referred to as "ROM”), electrically erasable programmable read-only memory (Electrically Erasable Programmable) ROM, referred to as "EEPROM”), magnetic disk, optical disk, Digital Versatile Disc (“DVD”) and so on.
  • PAL programmable array logic
  • RAM Random Access Memory
  • PROM Programmable Read Only Memory
  • ROM Read-Only Memory
  • EEPROM electrically erasable programmable read-only memory
  • magnetic disk magnetic disk
  • optical disk optical disk
  • DVD Digital Versatile Disc

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Description

微型投影机的驱动装置及驱动方法 技术领域
投影显示领域
背景技术
微型投影机是一种如同一个烟盒大小的便携性能的装置，它利用光源所发出的一定光量的光，将光调制器之类的显示设备中产生的图像放大投射到前方屏幕。
这样的微型投影装置若要嵌入到手机之类的移动设备的话，由于可充电电池的容量限制，会极大地限制其使用时间。为了增加移动论备的使用时，可以采用加大电池容量的办法，不过这种办法会导致其体积和重量的增加。
另一种办法是减少移动设备各部件的耗电量。在各部件中，作为微型投影装置中的核心部件的光学引擎是耗电量很大的一块，如何减少光学引擎的耗电量是非常重要的一点。特别是那些使用液晶的光学引擎，其光源的耗电量相当大，所以须采取降低耗电量的手段。
不过，如果降低光源的耗电量通常会损失一定的对比度，进而影响视觉效果。对比度（Contrast Ratio，简称“CR”）是全白时候的亮度与全黑时候的亮度之间的比例。如果对比度高的话，图像就能够显示得更清晰，因此对于微型投影机来说，对比度是一项非常重要的指标。
 技术问题
如何在基本保证视觉效果的前提下降低光源的耗电量，这成为微型投影装置急需解决的一个问题。
技术解决方案
为解决上述技术问题，本发明的实施方式提供了一种驱动装置，用于显示设备，该显示设备包括用于显示图像的光调制器和向该光调制器照射光的光源，驱动装置用于控制光源并驱动光调制器，驱动装置包括：
探测单元，用于在设定的时间区段中选取第一个图像信号和最后一个图像信号中特定位置的像素数据；
判读单元，用于将第一个图像信号中探测到的像素数据和最后一个图像信号中探测到的像素数据相比较判读；
转换单元，用于将判读单元的判读结果信息转换成光源光量调整用标准信号；
光源调整单元，用于根据转换单元输出的标准信号来调整光源的光量。
本发明的实施方式还提供了一种微型投影机，包括如上述上文至6中任一条的驱动装置。
本发明的实施方式还提供了一种微型投影机光源驱动方法，包括以下步骤：
判断当前正在播放的图像是静止图像还是视频图像；
如果是静止图像，则光源使用第一驱动功率；
如果是视频图像，则光源使用第二驱动功率；
其中第一驱动功率高于第二驱动功率。
 有益效果
本发明实施方式与现有技术相比，主要区别及其效果在于：
对前后图像在特定位置的像素进行比较，根据比较结果调整光源的光量，可以避免一直以最高光量显示对比度需求不同的图像，从而在保证视觉效果的前提下节省了电力，延长了便携式微型投影机电池的寿命。
对静止图像使用比视频图像更高的功率驱动光源，可以达到耗电量的最优化配置。
进一步地，将图像分区后，在每个区随机选择参加比较的像素，既大大减少了运算量，又有相当高的准确度。
 附图说明
图1是本发明第一实施方式中微型投影机驱动过程的简单示意图；
图2是本发明第一实施方式中系统驱动装置的简要示意图；
图3是微型投影装置结构的简单示意图；
图4是本发明第一实施方式的某一次比较中，特定像素位置分布图；
图5是本发明第一实施方式的另一次比较中，特定像素位置分布图；
图6是本发明第二实施方式中微型投影机光源驱动方法概要流程图。
 本发明的最佳实施方式
在以下的叙述中，为了使读者更好地理解本申请而提出了许多技术细节。但是，本领域的普通技术人员可以理解，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本申请各权利要求所要求保护的技术方案。
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明的实施方式作进一步地详细描述。
本发明第一实施方式涉及一种驱动装置。该驱动装置用于显示设备，该显示设备包括用于显示图像的光调制器和向该光调制器照射光的光源，驱动装置用于控制光源并驱动光调制器。本实施方式中，显示设备是微型投影装置，在本发明的其它实施方式中，也可以是其它的显示设备，只要该显示设备包括光调制器和光源就可以了。
图3是微型投影装置的结构的简要示意图。
如图3所示，光源（40）射出的光线通过集光透镜（70）集光并入射到光调制器（60）；光调制器（60）将入射的固定光量的光利用透过率或者反射率来进行调整；最后得出所需的亮度和对比度，光调制器所形成的图像通过投射透镜（80）放大并投影到屏幕（90）；最终可由用户们看到最终的图像。 因此，在屏幕上显示的图像亮度和对比度是完全取决于光源（40）所射出的光的量。
尤其是要用于微型投影机的话，光源不仅要体积小，也需要能够形成高能的光，能满足这些要求的光源有激光光源和发光二级管（Low Emitting Diode，简称“LED”）光源。这两种都是能在小体积和低耗电的前提下发出高光量的光源，但激光拥有相对更高的能源效率，LED则拥有价格较低的优点。激光和LED也可以组成混合（Hybrid）光源。
在静止图像和视频图像（即动态图像）的不同场合，其对比度要求是不同的。静止图像的对比度要求比视频图像的对比度要求更高。传统的投影机根据用途，有图片专用和视频专用的 ，并且根据各自用途预先设定好了对比度，但微型投影机则是用户们随身携带并用在各种场合的，可能会用来展示图片，也可能会用于播放视频。但是如果一律设置成高对比度就会造成耗电增加，一律设置成低对比度则会在投影静止图像的时候感觉比较模糊。因此，为了节省耗电量，本发明的实施方式增加了一个根据投射的图像是静止图片还是视频图像自动转换相应对比度的功能。
在静止图像状态下为了获得良好对比度，采取了调整驱动功率的方法。调整驱动功率的方式之一就是将光源的驱动功率提高，增加白光的亮度。与此相反，若是在视频播放条件下，可将光源驱动功率降低到80%来适度降低对比度。
本发明中所说的是，将所谓正常（Normal）状态设定为最高光源输出量，在视频条件下则将光源输出量下调到正常状态的80%来减少耗电量的方式；同样也能够适用相反的方案，即，将适度的光输出量设定为正常（normal）状态，当需要投影静止图像的时候将光输出量提高到120%。
光调制器的帧率（Frame rate）通常为60Hz以上，这是因为人的肉眼识别为连续影像的频率需最好要达到60赫兹以上。因此，每秒需要刷新60次左右的图像信号。
视频图像的话，这些60次的图像信号的值之间会有差异，但在静止图像的时候，则可视为是没有变化差异。因此，设定一定单位的时段，在该时段内比较帧（Frame）的图像信号就能够区分其为静止图像还是视频图像。在本实施方式中，设定了60帧的间隔时段将图像信号进行比较。将第1帧的图像信号和第60帧的图像信号相比较，若没有变化即判断为静止图像，若有变化则判断为视频图像。可以理解，也可以根据实际的应用情况选择其它的时间区段，如隔30帧、45帧、70帧等等。
在驱动装置中添加内存，就可以将帧内的所有图像数据储存起来，用以数据比较和判读。
但是，若要将图像信号的所有像素数据都采集并进行比较，则需要很多的内存容量，也会给控制芯片带来负荷。因此最好的方法就是将图像信号中的特定像素数据作为取样。假设其分辨率为VGA格式，则拥有640×480个像素，因此在相隔60帧之间比较帧内的像素数据的时候：
在水平方向，按1－213， 214－426， 427－640分为三个区段；
在垂直方向，按1－160， 161－320， 321－480分为三个区段；
这样总共有9个区，对于每一次比较，在每个区中以随机方式取一个像素，共有9个像素作为取样点。
将这9个像素数据进行储存后，在其后第60帧中选取同样位置的像素数据，相进行比较和判读。这些取样比较点不是每次固定的，而是在9个区内随机（Random）选定的。因此就需要在图像信号中选取像素数据的探测单元（检测部）中，设定上述随机（Random）函数的软件。
例如，某一次比较时特定像素的位置可以是图4的分布，而下一次比较时特定像素的位置可以是图5的分布。
将图像分区后，在每个区随机选择参加比较的像素，既大大减少了运算量，又有相当高的准确度。
此外，可以理解，也可以用其它的方式选择特定像素，例如可以在全画面中随机选择N个像素，或者分为4个区每个区随机选M个像素，或者在特定的应用中根据画面的特点在固定的位置选择若干个像素等等，其中M和N为正整数。
光调制器（60）是指将入射的光线进行选择性通过、阻断或改变光径来形成影像图片的元件。光调制器（60）的典型实例有数字微镜器件（Digital Micromirror Device，简称“DMD”）、液晶显示（Liquid Crystal Display，简称“LCD”）元件、硅基液晶（Liquid Crystal On Silicon，简称“LCOS”）等等。
DMD是用在数字光处理（Digital Light Processing，简称“DLP”）投影机的元件，它利用场时序（field sequential）的驱动方式，使用与像素数量一样多的矩阵形态排列的数码镜（DIGITAL MIRROR）。DLP是指从光源照射出的光用数码镜来调节光径，并用隔板反射来达到渐变（Gradation）或形成图象的投影仪。
液晶显示元件（LCD）是指选择性地开/关液晶来形成图象的元件。使用LCD元件的投影机中，有直视型（direct-view）、投射型以及反射型。直视型投影是液晶显示元件后面的背景光通过LCD面板形成图象并可以直接观察的方式；投射型投影是将通过液晶显示元件形成的图象利用投射透镜放大后投射到屏幕，观察从屏幕反射的图象的方式；反射型与投射型的结构基本相同，区别之处在于，反射型在LCD下面基板上设有反射膜，反射的光线被放大投射到屏幕上。
LCOS属于反射型液晶显示，它将以往液晶显示端的两面基板中的下方基板由透明的玻璃改为硅基板，从而用反射型方式运作。
上述的微型投影机驱动装置，都可以使用到上述各种显示面板上面。
投射透镜（80）由多个透镜构成，将由光调制器（60）形成的图象向屏幕（90）上放大投射。
图1是根据本发明的一个实例，是场时序（field sequential）微型投影机中驱动装置的简单示意图。
微型投影机的驱动装置，由图像处理器（10）、控制芯片（20）、光源驱动器（40）、帧缓冲（50）、光调制器（60）等部分构成。
图像的帧通过图像处理器（10）输入到控制芯片（20）中，控制芯片起到的是与显示处理器（Video Processor）相同的作用。
本实施方式中的光源，可使用R（红）G（绿）B（蓝）的LED光或激光。以前也有用高压汞灯或荧光灯作为光源的，但高压汞灯或荧光灯很难调节光量，而LED和激光则比较容易调节光量，因此容易适用本发明。
场时序（field sequential）是一种将帧时间（Frame time）等分为三块，区分为Red（红）/Green（绿）/Blue（蓝）的子帧（sub-frame），在各sub-frame时段中分别驱动各色的图像数据的显示方式。因此，此时的帧频（Frame rate）为180Hz，人的肉眼则会将各色光合成起来识别为完整的彩色图像。为此，如图1中显示，在第n-1顺序的图像在显示面板中驱动的时候，会将进入到图像处理器中的第n顺序帧的图像信号输入暂时搬存在帧缓冲（Frame Buffer）之中。本实施方式是以3个光源为例的，在本发明的其它实施方式中，光源也可以是其它数目，例如1个等。一般地说，如果光源有K个，光调制器将一帧的时间分为K段，每段显示与一个光源相对应的图像信号，其中K为正整数。
同样，原来在帧缓冲中储存的第n个图像数据在显示面板中驱动的时候，第n+1的图像数据会顺次储存到帧缓冲之中。按照这种图像数据的时序，驱动芯片会驱动光源驱动器，让光源配合着光调制器进行发光。
如同图2，在本发明中设置了：从记录在帧缓冲的图像信号中采样一个区段的帧（第一个帧和第六十帧）中特定位置的像素数据并储存到内存的探测单元、将第一个图像帧信号的像素数据和第六十个图像帧信号的像素数据进行比较以判定是否一致的判读单元、根据所判读的信息来转换成光源光量调整用标准信号的光源转换单元、以达到在静止图像和视频图像中采用不同的光源驱动状态。
本实施方式中，上述探测单元、判读单元和转换单元以片装（On-chip）的形式嵌入到起着显示处理器（Video Processor）作用的控制芯片（Control IC）之中。可以理解，探测单元、判读单元和转换单元都是逻辑单元，物理实现形式可以是多种多样的，除了以片装（On-chip）的形式嵌入控制芯片之中以外，也可以由单独的芯片实现，或者通过软件实现。
本实施方式中，通过分析输入到帧缓冲的图像信号来判定图像为视频图像还是静止图像，根据预设的光源驱动条件来调节光源驱动，从而达到耗电量的最优化配置。
本发明第二实施方式涉及一种微型投影机光源驱动方法，其流程如图6所示。
在步骤601中，判断当前正在播放的图像是静止图像还是视频图像。
如果是静止图像，则进入步骤602，光源使用第一驱动功率。
如果是视频图像，则进入步骤603，光源使用第二驱动功率。
其中第一驱动功率高于第二驱动功率。一般来说，第二驱动功率大概是第一驱动功率的75%至85%，当然也可以是其它的比例关系。一个典型的例子中，第二驱动功率是第一驱动功率的80%。
步骤602与603之后，重新回到步骤601进行下一次判断。
对静止图像使用比视频图像更高的功率驱动光源，可以达到耗电量的最优化配置。
在一个优选的例子中，步骤601的判断进一步包括以下子步骤：
在设定的时间区段（如60帧的间隔时段）中选取第一个图像帧信号和最后一个图像帧信号中特定位置的像素数据。
将第一个图像帧信号中探测到的像素数据和最后一个图像帧信号中探测到的像素数据相比较，如果相同则为静止图像，如果不同则为运动图像。
对前后图像在特定位置的像素进行比较，根据比较结果调整光源的光量，可以避免一直以最高光量显示对比度需求不同的图像，从而在保证视觉效果的前提下节省了电力，延长了便携式微型投影机电池的寿命。
此外，可以理解，也可以有其它的判断方法，例如，将前后两个图像对应像素相减，如果结果不为零则为运动图像，如果为零则为静止图像，又如可以在生成图像时预先设置标志，表示该图像是静止的还是运动的，播放时直接根据标志判断图像的类型。
本实施方式中，特定位置是指将图像在水平和垂直方向各三等分，共分为9个区，在每个区随机选择一个像素位置作为特定位置。在本发明的其它实施方式中，也可以用其它的方式选择特定像素，例如可以全画面随机选择N个像素，或者分为4个区每个区随机选M个像素，或者在特定的应用中根据画面的特点在固定的位置选择若干个像素等等，其中M和N为正整数。
第一实施方式是与本实施方式相对应的设备实施方式，本实施方式可与第一实施方式互相配合实施。第一实施方式中提到的相关技术细节在本实施方式中依然有效，为了减少重复，这里不再赘述。相应地，本实施方式中提到的相关技术细节也可应用在第一实施方式中。
本发明的方法实施方式可以以软件、硬件、固件等等方式实现。不管本发明是以软件、硬件、还是固件方式实现，指令代码都可以存储在任何类型的计算机可访问的存储器中（例如永久的或者可修改的，易失性的或者非易失性的，固态的或者非固态的，固定的或者可是换的介质等等）。同样，存储器可以例如是可编程阵列逻辑（Programmable Array Logic，简称“PAL”） 、随机存取存储器（Random Access Memory，简称“RAM”） 、可编程只读存储器（Programmable Read Only Memory，简称“PROM”） 、只读存储器（Read-Only Memory，简称“ROM”） 、电可擦除可编程只读存储器（Electrically Erasable Programmable ROM，简称“EEPROM”） 、磁盘、光盘、数字通用光盘（Digital Versatile Disc，简称“DVD”）等等。
虽然通过参照本发明的某些优选实施例，已经对本发明进行了图示和描述，但本领域的普通技术人员应该明白，可以在形式上和细节上对其作各种改变，而不偏离本发明的精神和范围。
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1．一种驱动装置，用于显示设备，该显示设备包括用于显示图像的光调制器和向该光调制器照射光的光源，所述驱动装置用于控制所述光源并驱动所述光调制器，其特征在于，所述驱动装置包括：
探测单元，用于在设定的时间区段中选取第一个图像信号和最后一个图像信号中特定位置的像素数据；
判读单元，用于将所述第一个图像信号中探测到的像素数据和最后一个图像信号中探测到的像素数据相比较判读；
转换单元，用于将所述判读单元的判读结果信息转换成光源光量调整用标准信号；
光源调整单元，用于根据所述转换单元输出的标准信号来调整所述光源的光量。
2．根据权利要求1所述的驱动装置，其特征在于，所述探测单元、判读单元、和转换单元集成在控制芯片中。
3．根据权利要求2所述的驱动装置，其特征在于，所述控制芯片起到将输入的电信号转换成图像信号再输出的图像处理器功能。
4．根据权利要求1所述的驱动装置，其特征在于，如果所述判读单元的判读结果是上述第一个图像信号中探测到的像素数据和最后图像信号中探测到的像素数据相同，则所述光源转换单元输出对应第一光量的标准信号，否则所述光源转换单元输出对应第二光量的标准信号，其中第一光量高于第二光量。
5．根据权利要求1所述的驱动装置，其特征在于，所述设定的时间区段为60帧的间隔时段。
6．根据权利要求1所述的驱动装置，其特征在于，所述特定位置是指将图像在水平和垂直方向各三等分，共分为9个区，在所述判读单元的每一次比较中，每个区随机选择一个像素位置作为该次比较的特定位置。
7．根据权利要求1至6中任一项所述的驱动装置，其特征在于，所述光源为激光、或发光二级管、或激光与发光二级管的混合光源。
8．根据权利要求1至6中任一项所述的驱动装置，其特征在于，所述光源有K个，光调制器将每一帧的时间分为K段，每段显示与一个光源相对应的图像信号，其中K为正整数。
9．根据权利要求1至6中任一项所述的驱动装置，其特征在于，所述光调制器是以下之一：
液晶显示元件、数字微镜器件、硅基液晶。
10．一种微型投影机，其特征在于，该微型投影机包括如上述权利要求1至6中任一条所述的驱动装置。
11．一种微型投影机光源驱动方法，其特征在于，包括以下步骤：
判断当前正在播放的图像是静止图像还是视频图像；
如果是静止图像，则所述光源使用第一驱动功率；
如果是视频图像，则所述光源使用第二驱动功率；
其中所述第一驱动功率高于第二驱动功率。
12．根据权利要求11所述的微型投影机光源驱动方法，其特征在于，所述第二驱动功率是所述第一驱动功率的75%至85%。
13．根据权利要求11所述的微型投影机光源驱动方法，其特征在于，所述判断当前正在播放的图像是静止图像还是视频图像的步骤包括以下步骤：
在设定的时间区段中选取第一个图像信号和最后一个图像信号中特定位置的像素数据；
将所述第一个图像信号中探测到的像素数据和最后一个图像信号中探测到的像素数据相比较，如果相同则为静止图像，如果不同则为运动图像。
14．根据权利要求13所述的微型投影机光源驱动方法，其特征在于，所述设定的时间区段为60帧的间隔时段。
15．根据权利要求13所述的微型投影机光源驱动方法，其特征在于，所述特定位置是指将图像在水平和垂直方向各三等分，共分为9个区对于每一次所述比较，在每个区随机选择一个像素位置作为该次比较的特定位置。
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