CN100470626C - Image display apparatus - Google Patents

Image display apparatus Download PDF

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CN100470626C
CN100470626C CN 200710006188 CN200710006188A CN100470626C CN 100470626 C CN100470626 C CN 100470626C CN 200710006188 CN200710006188 CN 200710006188 CN 200710006188 A CN200710006188 A CN 200710006188A CN 100470626 C CN100470626 C CN 100470626C
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light source
control
light
luminance
apl
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CN 200710006188
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CN101038731A (en )
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川島正裕
行天敬明
野田均
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松下电器产业株式会社
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Abstract

用APL检测单元(2)检测输入图象信号(1)的每个单位场期间的APL,光源控制数据生成单元(3)根据APL检测结果,在APL为0%~规定值A1时,生成能够稳定驱动光源(6)的最小电平的光源控制信号,在APL为规定值A2~100%时,生成能够稳定地驱动光源(6)的最大电平的光源控制信号,在APL为规定值A1~规定值A2时,生成与APL对应动态变化的光源控制信号,根据该光源控制信号驱动光源(6),以此能够改善对比度感不足及黑影浮现的产生现象,同时提高光源(6)的可靠性。 APL, light source control data generating unit during each field detection unit with an input image signal APL detection unit (2) (1) (3) according to the APL detection result, when the APL is 0% and a predetermined value A1, can be generated stable driving a light source (6) of the minimum level of the light source control signal, when A2 ~ 100%, generation capable of driving the light source control signal of the maximum level of the source (6), the APL is a predetermined value stably to a predetermined value A1 when the APL ~ when the predetermined value A2, the light source generates the control signal corresponding to the dynamic changes in the APL, the driving control signal based on the light source (6), this lack of a sense of contrast can be improved and a phenomenon emerges shadow, while increasing the light sources (6) reliability.

Description

图象显示装置本发明申请是国际申请日为2002年4月19日的、国际申请号为PCT/JP02/03900的、在中国的国家申请号为02801381.6的、发明名称为"图象显示装置及图象显示方法"的专利申请的分案申请。 The image display device of the present invention is to apply for an international filing date of April 19, 2002, and International Application No. PCT / JP02 / 03900, the National Application No. 02801381.6 in China for the, entitled "image display device and divisional application image display method "patent application. 技术领域本发明涉及图象显示装置及图象显示方法,特别是涉及对透射型或反射型的具有光调制作用的显示元件由光源照射光线以显示图象的图象显示装置及图象显示方法。 Technical Field The present invention relates to an image display apparatus and an image display method, and more particularly to transmissive or reflective type display device having a light modulation of light from the light source and an image display apparatus to display an image display method for an image . 背景技术近年来,随着磁带录像机及视盘播放机等图象设备及图象软件的充实,对于能够欣赏具有震撼力的图象的图象显示装置的希望越来越强烈。 In recent years, along with the full tape recorders and video disc players and other video equipment and software image, the image has to be able to enjoy the shocking image display apparatus hope more and more intense. 以往,作为利用透射型或反射型的具有光调制作用的显示元件对光源射出的光进行空间调制以显示图象的图象显示装置,有所谓直视型液晶显示装置及投影型显示装置。 Conventionally, as a light source for emitting spatially modulated to display an image of the image display apparatus, a so-called direct-viewing type liquid crystal display device and a projection type display apparatus using a transmission type or reflection type display device having a light modulating function. 直视型液晶显示装置,釆用液晶面板作为显示元件,直接用眼睛看液晶面板上显示的图象。 Direct-view type liquid crystal display device, preclude the use of a liquid crystal panel as a display element, see the image displayed on the liquid crystal panel directly by eye. 而另一种投影显示装置,是用强光源将液晶面板或其他显示元件上显示的图象投影到屏幕上来观看图象。 And another projection display apparatus, strong light source is a liquid crystal panel or other display on the image display element onto a screen projected image viewing. 若将采用具有这样的光调制作用的显示元件的图象显示装置与釆用CRT等自发光型显示元件的图象显示装置进行比较,则直视型液晶显示装置存在例如明亮场景的亮度感不足及黑暗场景的黑影浮现的问题。 If using such a display element having a light modulating function of the image display by the image display means and preclude self-luminous display device such as CRT device compares the direct-view type liquid crystal display device, for example, the presence of insufficient luminance of bright scenes sense and the problem of shadows in dark scenes emerge. 因此,正尝试解决这些问题。 So, we are trying to solve these problems. 在直视型液晶显示装置中,为了改善显示图象的质量,作为一般采用的方法,是对输入的图象信号进行对比度调整(信号放大增益的调整)或黑色电平调整等这样的电信号调整方法。 In the direct-view display type liquid crystal device, in order to improve quality of the displayed image, generally used as a method, an input image signal is a contrast adjustment (gain adjustment signal amplification) or a black level adjustment, etc. Such an electric signal adjustment method. 另外,也有的装置除了这些电气调整外,再使光源的辉度电平分为几级,能够可变。 In addition, some electrical devices in addition to these adjustments, then the light source luminance level is divided into several stages, can be variable. 但是,该光源辉度电平的调整是使用着通过手动进行,然后光源辉度处于固定状态。 However, adjustment of the luminance level of the light source is performed by using the manual, and then the light source brightness in a fixed state. 另外,在投影型显示装置中,同样具有光源辉度调整功能的显示装置也已 Further, in the projection type display device, the display device also has a light source brightness adjustment function have also been

经实用化,但这种情况与直视型显示装置不同,它的主要目的与其说是改善显示图象质量,还不如说是为了降低装置的功耗,对于屏幕大小及环境照明条件设定便于观看的图象亮度用的亮度调整、以及延长光源的寿命。 By practical, but this type of direct-view display devices, its main purpose is not so much to improve image display quality, as it is in order to reduce power consumption of the device, a screen for setting the size and easy to ambient lighting conditions image brightness adjusting brightness with viewing, and extending the life of the light source. 而且,该光源辉度电平的调整与直视型液晶显示装置相同,是使用者通过手动进行,然后光源辉度处于固定状态。 Further, the luminance level of the light source and the adjusting means the same as a direct-view liquid crystal display, is performed manually by the user, then the light source brightness in a fixed state. 如前所述,已有的直视型液晶显示装置及投影型显示装置,它们与CRT等自发光型显示装置相比,明亮场景的亮度感不足,黑暗场景的黑影浮现,这样的显示图象质量都很有必要改善。 As described above, conventional direct-view type liquid crystal display device and a projection type display apparatus, they are compared with the CRT, self-luminous display device, a bright scene is insufficient feeling of brightness, shadow of dark scenes emerge, showing such as it is necessary to improve quality. 但是,如上所述已有的直视型液晶显示装置及投影型显示装置采用的光源辉度控制方法是静态的固定控制,不能够对应于输入的图象信号的动态变化。 However, conventional direct-view type liquid crystal display device as described above, and a projection type display apparatus light source luminance control method is used in the fixed control static, dynamic change can not be correspond to the input image signal. 因此存在不能够改善输入图象信号的各场景中的显示图象质量这样的问题。 Thus there is a problem of each scene displayed image quality can not be improved in the input image signal. 因此,作为提高显示图象质量的一种方法,提出了根据图象场景使光源发光辉度动态变化的方法。 Therefore, as a method of improving the quality of the display image, the proposed light source luminance of the image scene in accordance with the method of dynamic change. 例如在日本专利特开平5—127608号公报及特开平6 一160811号公报等揭示了这种方法。 For example, Japanese Patent Laid-Open Publication No. 5-127608 and Unexamined Patent Publication No. 160811 discloses other six to this method. 在特开平5—12760S号公报中提出的方法是,根据输入图象信号的最大值、 最小值及其平均值,检测输入图象信号的特征,在最大值与最小值的电平差较大时,降低对比度控制,减小信号放大增益,而在最大值与最小值的电平差较小时,反之增加对比度控制,增大信号放大增益,同时在最大值与最小值的平均值比预先设定的规定值高时,降低光源的辉度,使显示装置的辉度接近一定值。 Method proposed in JP 5-12760S is, the maximum value of the input image signal, wherein the average value and the minimum value, the input image signal is detected, a large difference in the maximum and minimum electrical when, reducing the contrast control, the amplification gain reduction signal, the level difference is small and when the maximum and minimum values, on the contrary increase the contrast control to increase the signal amplification gain, while the average ratio of maximum and minimum values ​​set in advance given a predetermined high value, decrease the luminance of the light source, so that the luminance of the display device approaches a constant value. 另外,在特开平6—1608U号公报中提出的方法是,检测输入图象信号的最大值,在最大值较高时,增加光源的辉度,在最大值较低时,降低光源的辉度,又使最大值较低时的辉度信号振幅小于最大值较高时的辉度信号振幅,通过这样提高最大值较高时与较低时的相对的对比度比值。 Further, the method proposed in Japanese Patent Publication No. 6-1608U is, the maximum value of the input image signal is detected, the higher the maximum, increasing the luminance of the light source, when a maximum value is low, reducing the luminance of the light source , and that the luminance signal is low when the amplitude is smaller than the maximum value of the luminance signal amplitude at higher maximum contrast ratio is relatively low at the time of the maximum value by which improves high. 在特开平5— 127608号公报中提出的技术,如上所述,是根据输入场景动态控制光源辉度的技术,但是存在的问题是,以使显示辉度保持一定为目的, 对于电影软件那样的黑暗场景不能够改善黑影浮现的情况。 Technique proposed in JP-A No. 5- 127608, as described above, the dynamic light source luminance control in accordance with the input scene, but there is a problem that the display luminance to maintain a certain purpose, such as for movie software dark scenes can not improve the situation shadows emerge. 另外,由于根据输入图象信号的最大值与最小值的平均值进行光源辉度控制,因此存在对于局部性的最大值高或最小值低的输入场景,不能够捕捉到输入场景的特征,对光源辉度进行不适当的调整的问题。 Further, since the light source luminance control in accordance with the average maximum and minimum values ​​of the input image signal, and therefore there is a local maximum or minimum high-low input scene, can not capture the features of the input scene on the light source luminance adjusting undue problems. 还有,由于是不连续地进行光源辉度的调整, 因此存在着在光源辉度变化时刻,画面辉度有很大变化,使收视者产生不舒适 Further, since it is not continuously adjusted luminance light source, there is a change in luminance of the light source in time, the screen brightness changes greatly, so that a viewer discomfort generated

感的问题。 A sense of the problem. 另外,在特开平6—1608U号公报中提出的技术,如上所述,也是根据输入图象信号动态控制光源辉度的技术,但是由于是根据输入图象信号的最大值控制光源辉度,因此存在的问题是,尽管平均辉度电平(下面称为APL)较低, 但局部最大值较高这样的输入场景的情况下,光源辉度增高,反而在图象的黑暗部分产生黑影浮现。 Further, in the technique proposed in JP 6-1608U, as described above, but also dynamic source luminance control in accordance with the input image signal, but since the light source luminance is controlled based on the maximum input image signal, so there is a problem, although the average luminance level (hereinafter, referred to as APL) is low, but higher in the case of such local maximum input scene, the light source luminance increases, but come to a dark portion is generated shadow image . 还有,投影型显示装置用的氙灯或高压汞灯这样的放电式光源由于驱动条件反复急剧变化,将产生这样的问题,即引起点灯起动性能不稳定及正常点灯时的闪烁等正常点灯性能恶化及寿命特性恶化,灯的可靠性降低。 Further, the projection-type display high pressure mercury lamp or a xenon lamp light source device such as a discharge due to the repeated abrupt change in driving conditions, this will produce a problem that flicker caused by the normal starting time of lighting the lighting performance unstable and normal lighting deteriorate and deterioration of life characteristics, reducing the reliability of the lamp. 发明内容因此,本发明的目的在于,在由透射型或反射型的具有光调制作用的显示元件及对该显示元件照射光线的光源构成的图象显示装置中,改善显示图象品质的问题(对比度感的不足及黑影浮现(floating blackness))。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention, the image display device display a transmissive or reflective type display having a light modulation element and the acting element for illuminating light sources, the problem of improving the display quality of an image ( the lack of a sense of contrast and shadows emerge (floating blackness)). 另外,本发明的另一目的在于,在动态控制照射显示元件的光量时,改善调整光量用的光源、 光圈或调光元件的可靠性。 Further, another object of the present invention, when the dynamic control of the irradiation light amount of the display device, improvement in reliability of the light source, a diaphragm or the dimming light amount adjustment member used. 本发明的又一目的在于,提供一种图象显示装置及方法,它根据输入图象信号改变光源的辉度,以此实现有对比度感的图象显示,另一方面,能够防止因光源辉度急剧变化而引起的显示的不舒适感,又能够提高光源的寿命。 A further object of the present invention is to provide an apparatus and method for image display, it changes the luminance of the light source according to an input image signal, in order to achieve an image display with a contrast feeling, on the other hand, the light source luminance can be prevented of rapid change caused discomfort display, but also can improve the life of the light source. 本发明为了达到上述目的,具有如下所述的特征。 To achieve the object of the present invention, having the features described below. 本发明的第一方面提供一种图象显示装置,通过在透射型或反射型的具有光调制作用的显示元件上照射来自光源的光线以显示图象,包括:将输入图象信号的辉度电平分割为多个辉度电平区、并检测每个辉度电平区的直方图分布的直方图生成装置;以及对所述光源的光量进行控制的光量控制装置,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,所述光量控制装置控制所述光源的光量,使得照射在所述显示元件上的光量固定在规定的最小电平。 The first aspect of the present invention to provide an image display apparatus, by irradiating light from a light source in the transmissive or reflective type display device having a light modulating function to display an image, comprising: an input video luminance signal is divided into a plurality of levels of luminance level region, the histogram generation means, and detecting the luminance level of the histogram of each area distribution; and controlling the amount of light of the light amount of the light source control means, when said histogram when the amount of light histogram of the luminance level of the at least one region of the plurality of generating means detected luminance level of the region of distribution is greater than a predetermined threshold value, the light quantity control means for controlling the light source such that said irradiation It shows the minimum amount of light on the level of a predetermined fixing member. 本发明的第二方面提供一种图象显示装置,通过在透射型或反射型的具有光调制作用的显示元件上照射来自光源的光线以显示图象,包括:将输入图象信号的辉度电平分割为多个辉度电平区、并检测每个辉度电平 A second aspect of the present invention to provide an image display apparatus, by irradiating light from a light source in the transmissive or reflective type display device having a light modulating function to display an image, comprising: an input video luminance signal It is divided into a plurality of levels of luminance level region, and detects the luminance level of each

区的直方图分布的直方图生成装置;以及设置在所述光源与所述显示元件之间用于控制照射在所述显示元件上的光量的光圈,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,控制所述光圈,使得照射在所述显示元件上的光量固定在规定的最小电平。 Histogram generating means a histogram distribution region; and a display disposed on the light source and the element for controlling the amount of light between the illumination on the display element aperture, said histogram generating means when the detected when the luminance histogram of the at least one of said plurality of level regions luminance level distribution is greater than a predetermined area threshold value, the control aperture, such that a predetermined amount of light irradiated on the fixed element of the minimum level in the display. 本发明的第三方面提供一种图象显示装置,通过在透射型或反射型的具有光调制作用的显示元件上照射来自光源的光线以显示图象,包括:将输入图象信号的辉度电平分割为多个辉度电平区、并检测每个辉度电平区的直方图分布的直方图生成装置;以及设置在所述光源与所述显示元件之间用于调节照射在所述显示元件上的光量的调光元件,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,控制所述调光元件,使得照射在所述显示元件上的光量固定在规定的最小电平。 A third aspect of the present invention to provide an image display apparatus, by irradiating light from a light source in the transmissive or reflective type display device having a light modulating function to display an image, comprising: an input video luminance signal It is divided into a plurality of levels of luminance level region, the histogram generation means, and detecting the luminance level of the histogram of each area distribution; and the light source disposed between the display element for adjusting the irradiation in the when the light amount of the dimming element on said display element, when the plurality of luminance histogram of the histogram generator means detecting the level of at least one region luminance level region is greater than a predetermined threshold distribution, the control the dimming element, such that a predetermined amount of light irradiated on the fixed element of the minimum level in the display. 本发明的第四方面是如上述第一方面所述的图象显示装置,其中,还包括设置在所述光源与所述显示元件之间用于控制照射在所述显示元件上的光量的光圈,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,控制所述光源和光圈,使得照射在所述显示元件上的光量固定在规定的最小电平。 A fourth aspect of the present invention is the above-described image display apparatus according to the first aspect, wherein, further comprising an aperture disposed in the light source for controlling the display of the display element between the irradiation light amount of the element when the luminance level of the plurality of regions of the histogram generator means detecting at least one of the luminance level of the histogram distribution area larger than a predetermined threshold value, controlling the light source and the diaphragm, so that the irradiated the minimum level of said display elements on the amount of light in a predetermined fixed. 本发明的第五方面是如上述第一方面所述的图象显示装置,其中,还包括设置在所述光源与所述显示元件之间用于控制照射在所述显示元件上的光量的调光元件,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,控制所述光源和调光元件,使得照射在所述显示元件上的光量固定在规定的最小电平。 A fifth aspect of the present invention is the above-described image display apparatus according to the first aspect, wherein, further comprising a light amount adjusting on the display element disposed between the light source and the display elements for controlling the illumination between an optical element, when the luminance histogram distribution of at least one of said plurality of level regions of said luminance histogram generator means detecting the level of the region is greater than a predetermined threshold value, controlling the light source and a light modulating device, such that a predetermined fixed amount of light irradiated on the minimum level of the element in the display. 本发明的第六方面是如上述第一至第五方面中任一方面所述的图象显示装置,其中,所述多个辉度电平区中的所述至少一个辉度电平区是最接近黑色电平的区。 A sixth aspect of the present invention is the above first to fifth aspect of the aspect of any image display device, wherein the plurality of luminance level region in at least a luminance level region is closest to the black level area.

附图说明图1所示为本发明第1实施形态的图象显示装置的构成的方框图。 BRIEF DESCRIPTION block diagram illustrating an image apparatus according to the first embodiment of the present invention shown in FIG. 1. 图2所示为光源辉度控制的一种方法。 Figure 2 shows a method of controlling light source brightness. 图3所示为第1实施形态的光源辉度控制的方法。 FIG method of a light source luminance is the first embodiment of the control shown in FIG. 图4所示为第1实施形态的信号处理的具体例子。 Figure 4 is a specific example of signal processing of the first embodiment. 图5所示为第1实施形态的信号处理动作的情况。 Figure 5 shows the case where the signal processing operation according to the first embodiment. 图6所示为第1实施形态的信号处理的变形例。 Figure 6 shows a modification of the signal processing of the first embodiment. 图7所示为将第1实施形态的光源控制方法用于光圈控制时的图象显示装置构成例的方框图。 Figure 7 shows a light source control method of the first embodiment of the image for iris control block diagram of a display apparatus. 图8所示为将第1实施形态的光源控制方法用于光圈控制时的光圈控制方法。 Figure 8 shows the diaphragm control method when the iris is used to control the light source control method of the first embodiment. 图9所示为将第1实施形态的光源控制方法用于光圈控制时的信号处理具体例子。 Figure 9 shows a specific example of the signal processing time of the light source control diaphragm control method of the first embodiment. 图IO所示为将第1实施形态的光源控制方法用于调光元件控制时的图象显示装置的构成方框图。 As shown in FIG IO block diagram illustrating a display device as the light source control method for the first embodiment of an image when the light adjustment control element. 图11所示为将第1实施形态的光源控制方法用于调光元件控制时的图象显示装置的其他构成方框图。 Figure 11 is a block diagram showing the configuration of the other light source control method of a first embodiment of the image element for the dimming control is displayed. 图12所示为将第1实施形态的光源控制方法用于调光元件控制时的调光元件控制方法。 Figure 12 is a light source control method of the first embodiment of the device for dimming when the dimming control method of the control element. 图13所示为将第1实施形态的光源控制方法用于调光元件控制时的信号处理具体例子。 Specific examples of the process shown in FIG. 13 is a light source control method of the first embodiment, a signal for tone control when the light receiving element. 图14所示为本发明第2实施形态有关的图象显示装置的构成方框图。 14 shows an image related to the second block diagram illustrating an embodiment of a display device according to the present invention. 图15所示为第2实施形态的信号处理的具体例子。 Figure 15 is a specific example of signal processing of the second embodiment. 图16所示为将第2实施形态的光源控制方法用于光圈控制时的信号处理具体例子。 Figure 16 shows a specific example of the light source control signal processing method of the second embodiment of a diaphragm control. 图17所示为将第2实施形态的光源控制方法用于调光元件控制时的信号处理具体例子。 Figure 17 is a light source control method of the second embodiment of the signal processing time for a specific example of the dimming control device. 图18所示为本发明第3实施形态有关的图象显示装置的构成方框图。 18 shows an image related to a block diagram of a third embodiment of the display device in the present invention. 图19所示为第3实施形态的信号处理具体例子。 Figure 19 is a signal processing embodiment of the third aspect of the specific examples. 图20所示为第3实施形态的信号处理变形例。 The signal processing shown in FIG. 20 is a modification of the third embodiment. 图21所示为本发明第4实施形态有关的图象显示装置的构成方框图。 Figure 21 shows an image related to a block diagram of a fourth embodiment of the display device in the present invention.

图22为关于直方图生成单元15的工作情况的说明图。 FIG 22 is a diagram for illustrating the operation of the histogram generation unit 15. 图23所示为将第4实施形态的光源控制方法用于光圈控制时的图象显示装置的构成方框图。 Figure 23 shows a block diagram of an image forming means for controlling the aperture of light source control method of the fourth embodiment when displaying. 图24所示为将第4实施形态的光源控制方法用于调光元件控制时的图象显示装置的构成方框图。 FIG 24 is a block diagram illustrating a display device in the light source control method of the fourth embodiment for controlling the image when the light modulation element. 图25所示为将第4实施形态的光源控制方法用于光源及光圈控制时的图象显示装置的构成方框图。 Is a block diagram illustrating an image of the light source apparatus control method of the fourth embodiment of a light source and aperture control shown in FIG. 25 is displayed. 图26所示为将第4实施形态的光源控制方法用于光源及调光元件控制时的图象显示装置的构成方框图。 Figure 26 is a block diagram illustrating the light source apparatus control method of the fourth embodiment of the image source and the light modulating element for control of the display. 图27所示为将第4实施形态的光源控制方法用于光源、光圈及调光元件控制时的图象显示装置的构成方框图。 It is a block diagram illustrating an image of the light source apparatus control method of the fourth embodiment of a light source, an aperture and a dimming control device shown in FIG. 27 is displayed. 图28所示为本发明第5实施形态有关的图象显示装置的构成方框图。 Figure 28 relating to a fifth image block diagram illustrating an embodiment of a display device according to the present invention. 图29所示为APL检测单元2输出的APL信号及光源6的发光辉度随时间变化的一个例子。 6 example of a light emission luminance with time is a variation of FIG. 29 APL detection output signal APL unit 2 and the light source shown in FIG. 图30所示为信号变化控制单元32的构成方框图。 FIG. 30 is a block diagram showing signal change unit 32 controls. 图31所示为本发明第6实施形态有关的图象显示装置的构成方框图。 A block diagram of apparatus constituting a sixth embodiment of the present invention shown in FIG. 31 related to the image display form. 图32所示为APL检测单元2输出的APL信号及光源6的发光辉度随时间变化的一个例子。 FIG 32 a luminance of example 6 change with time of the output APL detection unit 2 shown in APL signal and a light source. 图33所示为信号变化控制单元33的构成方框图。 Figure 33 is a block diagram showing signal change unit 33 controls. 图34所示为本发明第7实施形态有关的图象显示装置的构成方框图。 Figure 34 present a block diagram of apparatus constituting a seventh embodiment of the image display related to the invention. 图35所示为APL检测单元2输出的APL信号及光源6的发光辉度随时间变化的一个例子。 An example APL signal and the light source 35 shown in FIG. 2 the output APL detection unit 6 of the emission luminance varies with time. 图36所示为光源发光辉度状态检测单元35的构成方框图。 Figure 36 shows a block diagram showing luminance state detection unit 35 is made as a light source. 图37为说明本发明第7实施形态有关的效果用的比较例的说明图。 FIG 37 is a diagram illustrating a comparative example relating to a seventh embodiment of the present invention with the effect. 图38所示为本发明第8实施形态有关的图象显示装置的构成方框图。 The image shown in Figure 38 relating to the eighth embodiment of the display device in a block diagram of the present invention. 图39所示为APL检测单元2输出的APL信号、来自系统控制单元44的静噪信号及光源6的发光辉度随时间变化的一个例子。 FIG 39 is a signal output from the APL APL detection unit 2, an example of the squelch signal and the luminance of the light source 44 from the system control unit 6 changes over time. 图40所示为信号变化控制单元37的构成方框图。 FIG. 40 is a block diagram showing signal change unit 37 is controlled. 具体实施方式下面参照附图说明本发明的各种实施形态。 Brief Description of the various embodiments of the present invention with reference to specific embodiments below. 第1实施形态图1所示为本发明第1实施形态有关的图象显示装置的构成。 The first embodiment shown in FIG. 1 relating to a first image display device in embodiment of the present invention. 图象显示装置具有APL检测单元2、光源控制数据生成单元3、 LPF4、光源驱动电路5、 光源6、光学系统7、显示元件8、图象信号处理电路9、显示元件驱动单元10、 微型计算机11及定时器12。 APL detection device having an image display unit 2, a light source control data generating unit 3, LPF4, the light source driving circuit 5, the light source 6, an optical system 7, a display device 8, an image signal processing circuit 9, a display 10, a microcomputer unit drive element 11 and the timer 12. 在图象显示装置是投影装置时,设置光学系统7, 而在直视型的情况下则不设置。 When the image display device is a projection device, an optical system 7, and in the case of direct view type is set. 下面说明第1实施形态的工作情况。 The following explanation of the operation of the first embodiment. 图象信号1提供给图象显示装置。 An image signal is supplied to the image display device. 图象信号1输入至图象信号处理电路9 及APL检测单元2。 A video signal input to the image signal processing circuit 9 and the APL detection unit 2. 输入至图象信号处理电路9的图象信号1进行对比度控制及亮度控制等对显示装置所必须的信号处理后,通过显示元件驱动单元10作为适合于显示元件8的光调制作用的驱动信号输入至显示元件8。 After an image signal inputted to the video signal processing circuit 9 1 contrast control and brightness control of the display device and the like necessary for signal processing, through the display unit 10 as a driving element adapted to effect optical modulation element 8 driving a display signal input 8 to the display element. 关于图象信号处理电路9及显示元件驱动单元10中的信号处理,由于是众所周知的,因此省略其详细说明。 About video signal processing circuit 9 and the signal processing unit 10 drives the display element, as is well known, a detailed description thereof will be omitted. APL检测单元2根据输入图象信号1的辉度信号分量,在每个单位场期间检测APL,将检测结果输出给光源控制数据生成单元3。 APL detection unit 2 in accordance with the luminance signal component of the input image signal 1, the APL is detected during each field unit, outputs the detection result to the light source control data generating unit 3. 光源控制数据生成单元3生成与APL检测结果相对应的光源控制数据。 Light source control data generating means 3 generates light source control data corresponding to the APL detection result. 生成的光源控制数据经LPF4 输入至光源驱动电路5。 Generated light source control data input to the light source driving circuit 5 via the LPF4. 光源驱动电路5根据与光源控制数据相应的驱动条件驱动光源6。 The light source drive circuit 5 and light source control data of the corresponding driving conditions driving the light source 6. 由光源6发出的光利用光学系统7聚焦,作为与显示元件8的显示范围相对应的照明光照射显示元件8。 An optical system using the light emitted from the light source 67 is focused, as a display range corresponding to the element 8 of the illumination light irradiating the display element 8. 微型计算机11及定时器12为了进行APL检测时及光源控制数据生成时的时间轴控制,对APL检测单元2及光源数据生成单元3进行控制。 The microcomputer 11 and the timer 12 to time-axis control and the light source when the APL detection control data generation, in APL detection unit 2 and the light source control data generating unit 3. 下面参照图2〜图4,说明光源控制数据生成单元3的具体处理内容及LPF4 的作用。 Referring to Figure 2 ~ Figure 4, the operation of the light source specific processing contents of the control data generating unit 3 and the LPF4. 若以投影装置使用的放电灯为例,则如图2所示,光源驱动功率的电平在Ll (min)〜L2 (max)的范围是光源稳定点灯的区域。 In terms of the discharge lamp projection apparatus used, for example, is shown in Figure 2, the light source driving power level in the range of Ll (min) ~L2 (max) is the stable lighting region of the light source. 在光源驱动功率的电平小于L1 (min)时,不能使光源稳定点灯。 When the level of the driving power source is less than L1 (min), the light source can not stably lighting. 因而,在改变光源驱动功率时, 必须在稳定点灯区域(Ll (min)〜L2 (max))的功率范围内驱动光源。 Thus the driving source, the driving power when the light source is changed, must be in a stable lighting region (Ll (min) ~L2 (max)) of the power range. 因此,本实施形态中的与输入图象信号1的APL相对应的动态光源控制也使用稳定点灯区域进行。 Accordingly, the present embodiment aspect of a dynamic light source control corresponding to the APL of the input image signal 1 is also used stable lighting region. 图2中,作为参考用虚线表示对于输入图象信号1的APL的变化范围(0。/。〜 100%),使光源功率从L1 (min)至L2 (max)直线变化时的输入图象信号1 的APL与光源控制电平的关系。 In FIG. 2, indicated by broken lines as a reference for the input image signal APL variation range of 1 (100% 0./.~), power from the light source L1 (min) when the input image to L2 (max) varies linearly relationship between APL and the light source control signal of 1 level. 这种情况下,仅仅在输入图象信号1的APL 为0%时,光源控制电平处于稳定点灯区域的最小值Ll (min)。 When such a case, only the input image signal APL 1 is 0%, the control light at a minimum level Ll stable lighting region (min). 因此,APL 例如为图中所示的B1时,尽管是黑暗场景,但光源控制电平并没有多大下降, 不能防止黑影浮现。 Thus, APL, for example, when B1 shown in FIG, although a dark scene, the light source control level but not much decreased, can not prevent shadows emerge. 另外,仅仅在输入图象信号1的APL为100%时,光源控制电平为稳定点灯区域的最大值L2 (max) =100%。 Further, only the input image signal APL 1 is 100%, the light source control level is the maximum value of the stable lighting region L2 (max) = 100%. 因此,APL例如为图中所示的B2时,尽管是明亮场景,但光源控制电平也不是最大,有损白色峰值的亮度感。 Thus, APL, for example, when B2 shown in FIG, although a bright scene, the light source control level is not the maximum, white peak lossy perceived brightness. 另外,特别是采用电影软件时,由于电影相对地在整个画面上出现黑暗场景较多,因此黑影浮现的影响也大,由于该黑影浮现的产生,将大大有损图象的显示质量。 Further, when using particular movie software, because the film appears dark scenes on the entire screen is relatively large, so the impact is large shadows emerge, emerge due to generation of the shadow will show significantly detrimental to image quality. 因而,最好在黑暗场景最大限度地防止黑影浮现。 Therefore, in dark scenes preferably maximally prevent shadows emerge. 另外,在人们收视电影软件时,若与黑暗场景的暗适应存储对比,在明亮场景的亮度电平大,则感觉对比度高。 In addition, when people viewing movie software, if a dark scene with dark adaptation storage contrast, brightness in bright scenes electric flat large, high contrast feeling. 反之,若与明亮场景的明适应存储对比, 在黑暗场景的黑暗电平低,则感觉对比高。 Conversely, if the comparison with the stored light-adapted a bright scene, in a low level of darkness of the dark scene, the feeling of high contrast. 提高对比度感对于提高图象的显示质量是很重要的。 Improve the contrast feeling to improve the display quality of the image is very important. 因此产生黑影浮现,或者在明亮场景白色峰值的亮度感受到损害会导致对比度下降,所以是不希望发生的。 Thus creating shadows emerge, or bright scenes of peak white brightness felt damage cause a reduction in contrast, it is undesirable. 在本实施形态中,鉴于上述情况,为了更提高图象的显示质量,进行图3 所示的光源功率控制。 In the present embodiment, the light of the above, in order to more improve the display quality of an image, a light source power control is shown in FIG. 图3所示的Al及A2为预先设定的APL的阈值。 Al and A2 shown in FIG. 3 for the APL threshold value set in advance. Al及A2的阈值电平是分别用于区分黑暗场景及明亮场景用的阈值,可根据电影软件的评价得到。 Al and A2, respectively, the threshold level is a threshold value for distinguishing bright and dark scenes with scene of the movie may be obtained according to the evaluation software. 在采用电影软件以外的明亮场景多的软件等情况下,也可以根据图象源改变这些阈值的设定。 In the case of movie software other than the software, and more bright scenes, may be changed to set these thresholds based on the image source. 在图3中,作为光源控制的第1模式(固定区域Low),是在输入图象信号1的APL小于阈值A1时,使光源控制电平为L1 (min),保持一定。 In Figure 3, a first mode (fixing region Low) light control, when the input image signal is the APL is smaller than a threshold value A1, the light source control level is L1 (min), kept constant. 作为第2模式(相应可变区域),是在输入图象信号l的APL为阈值A1〜阈值A2 时,相应于APL的变化在L1 (min)〜L2 (max)的范围内改变光源控制电平。 As the second mode (the corresponding variable region), l is the input image signal is the threshold value of the APL A1~ threshold value A2, corresponding to a change in the APL to change the light source control circuit in the range of L1 (min) ~L2 (max) of level. 作为第3模式(固定区域High),输入图象信号1的APL大于阈值A2时,使光源控制电平为L2 (max),保持一定。 As the third mode (fixing area High), the input image signal is greater than a threshold value APL 1 A2, the light source control level is L2 (max), is kept constant. 另外,在图3中,设相应可变区域的APL与光源控制电平的关系为线性关系,但不限于此,例如光源控制电平与光源驱动功率的关系或者光源驱动功率与光源发光强度的关系为非线性时,在该相应可变区域中也采用对非线性特性进行逆校正那样的函数即可。 Further, in FIG. 3, is provided with a respective variable region of the light source control of the relationship between APL level is a linear relationship, but not limited to, for example, the relationship between the light source and the light level of the control or drive power source and driving power source luminous intensity when the relationship is non-linear, the corresponding variable region are also used in the nonlinear characteristics inverse to function as a correction. 还有,不限于该非线性特性的逆校正,也可以作为任意的非线性特性的函数。 Also, inverse correction is not limited to the non-linear characteristic, as a function may be any non-linear characteristics. 下面参考图4具体说明输入图象信号1的APL的动态变化与光源控制电平 4 specifically described below with reference to FIG dynamic changes and light source control APL level of the input image signal 1

的动态控制的关系。 Dynamic control of the relationship. 在图4中,上图表示输入至光源控制数据生成单元3的输入APL的动态变化的一个具体例子,下图表示与上图所示的输入APL的动态变化对应的光源控制电平的动态控制。 In Figure 4, the figure represents a specific example of the input APL is inputted to the dynamic light source control data generating unit 3, the view showing light source control and dynamic control level corresponding to the dynamic change of the input APL is shown on FIG. . 特别是在下图中,实线表示来自光源控制数据生成单元3的输出信号,虚线表示来自LPF4的输出信号。 Particularly in the lower diagram, the solid line represents the output signal from the light source control data generating unit 3, a broken line indicates the output signal from the LPF4. Tn为检测APL的单位场时间。 Tn the field as a unit time detection of APL. 如图4所示,在本实施形态中,根据前述图3所示的控制方法进行控制,使得对于APL的动态变化,在APL处于相应可变区域(Al〜 A2)时,光源控制也动态跟踪,但在APL处于固定区域Low及固定区域High 时,分别使光源控制电平为L1 (min)及L2 (max),保持一定。 As shown, in this embodiment, is controlled according to the control method shown in FIG. 4. 3, so that the dynamic change in the APL, when the APL is in the corresponding variable region (Al~ A2), dynamic tracking light source control also but when the APL is in a fixed region and a fixed region High Low, respectively, the light source control level is L1 (min) and L2 (max), is kept constant. 下面说明LPF4的作用。 The following description of the role of LPF4. 如上所述,图4的下图的实线的动态变化表示来自光源控制数据生成单元3的输出信号,即对LPF4的输入信号,根据LPF4的预先设定的时间常数,LPF4的输出信号如图4的下图的虚那样变化,通过光源驱动电路5驱动光源6。 As described above, the dynamic variation of the solid line in FIG. 4 represents the output signal from the light source control data generating unit 3, i.e., the input signal to the LPF4, the time constant set in advance according to the LPF4, the output signal LPF4 FIG. as the change of virtual FIG. 4, 5 through the light source driving circuit driving the light source 6. 在放电灯的情况下,驱动功率的急剧的变化将影响放电电弧的状态,引起灯电极的劣化,有损灯的可靠性。 In the case of the discharge lamp, an abrupt change will affect the state of the driving power of the discharge arc, causing deterioration of the lamp electrodes, detrimental to the reliability of the lamp. 因此,在本实施形态中, 采用LPF4,使其具有时间常数,改变驱动功率,使得在改变驱动功率的过渡状态下不引起灯可靠性的降低。 Accordingly, in the present embodiment, LPF4 employed, it has a time constant, changing the driving power, so as not to cause a reduction in the reliability of the lamp driving power to change the state transition. 对于LPF4,其具体电路由于是众所周知的,因此加以省略,可以是模拟LPF,也可以是数字LPF。 For LPF4, since the specific circuit is well known, be omitted, the LPF may be an analog, may be a digital LPF. 在采用数字LPF作为LPF4 时,只要在光源驱动电路5的处理中转换为模拟信号即可。 In the digital LPF as LPF4, as long as the conversion processing in the source drive circuit 5 to an analog signal. 另外,也可以采用对来自光源控制数据生成单元3的输出信号提供延迟作用的其他手段来代替LPF4。 Further, other means may be used to provide delayed action of the output signals from the light source control data generating unit 3 in place of LPF4. 若将图4说明的动态控制以与图3同样的形式表示,则如图5所示,在APL 处于相应可变区域(A1〜A2)时,光源控制电平如图中所示的箭头那样,相应于输入图象信号1的APL变化,在稳定点灯区域动态转移。 If dynamic control illustrated in FIG. 4 represents the same format as FIG. 3, FIG. 5, the APL in the respective variable region (A1~A2), the light source control circuit arrows shown flat as in FIG. , corresponding to a change of the input image signal APL, the dynamic transition in a stable lighting region. 如上所述,采用第1实施形态,通过动态驱动光源,能够根据图象场景动态调整辉度,能够改善明亮场景的亮度感不足及黑暗场景的黑影浮现的问题, 能够提高对比度感。 As described above, the first embodiment, by dynamically driving the light source can be dynamically adjusted according to the brightness of the scene image, the problem can be improved and the luminance feeling of lack of shadows dark scenes bright scenes emerge, it is possible to improve the contrast feeling. 另外,在黑暗场景、即输入图象信号的APL小于规定阈值时,由于使光源控制电平为稳定点灯区域的最小值,因此能够更进一步改善黑暗场景的黑影浮现的问题,另外在明亮场景、即输入图象信号的APL大于规定阈值时,由于使光源控制电平为稳定点灯区域的最大值,因此能够更进一步改善明亮场景的亮度感不足的问题,结果能够能进一步提高对比度感。 Further, in dark scenes, i.e., the input image signal APL is smaller than a predetermined threshold value, since the light source control level is a minimum stable lighting region, it is possible to further improve the problems emerged shadow dark scenes, while in bright scenes , that the APL of the input image signal is greater than a predetermined threshold value, since the maximum level of the light source control region is a stable lighting, it is possible to further improve the feeling of insufficient luminance of a bright scene, and the result can be a sense of contrast can be further improved. 另外,在本实施形态中是这样进行控制,也就是使得在APL处于固定区域Low及固定区域High时,分别使光源控制电平为Ll (min)及L2 (max),保持一定,但也不一定必须使光源驱动电平以最小电平或最大电平保持一定, 即使是在他们的相近电平,当然也能够得到更进一步改善上述黑暗场景的黑影浮现的问题及明亮场景的亮度感不足问题。 Further, in the present embodiment is controlled such that when the APL is in a fixed region and a fixed region Low High, respectively, as the light source control level Ll (min) and L2 (max), to maintain a certain, but not necessarily the light source drive level to maintain a certain minimum level or maximum level, even if they are similar in level, of course, also possible to obtain more improved feeling of insufficient luminance of the above dark scene and shadow emerging as a bright scenes problem. 但是,如本实施形态那样以最小电平或最大电平固定驱动,则能够最大限度得到这些效果,同时由于在黑暗场景及明亮场景中光源驱动电平不变化,因此还能够改善光源可靠性下降的问题, 所以是比较理想的。 However, as in the present embodiment, as the minimum level or maximum level fixed drive level, these effects can be obtained at a maximum, the light source drive level simultaneously in the dark and bright scenes in the scene does not change, it is also possible to improve the reliability of the light source decline the problem, it is an ideal. 另外,在本实施形态中,如图4所示,是根据每个单位场时间Tn的APL 来控制光源控制电平的,但是也可以计算多个单位场时间Tn的APL的平均值, 并根据该平均值来控制光源控制电平,以代替上述方法。 Further, in the present embodiment, as shown in FIG. 4, the light source is controlled according to the control level per unit time Tn field of APL, but the average value may be calculated APL plurality of unit field time Tn, and according to the light source control for controlling the average level, instead of the above-described method. 例如,将图4的上图的Tn (单位场时间)作为T2K= (Tn —K+Tn — K+lH-----hTn+…+Tn+K一1+Tn + K) / (2K+1),置换为多个单位场的APL的检测结果的平均值。 For example, the upper diagram of FIG. 4 Tn (field unit time) as T2K = (Tn -K + Tn - K + lH ----- hTn + ... + Tn + K a 1 + Tn + K) / (2K + 1), is replaced with the average value of the APL detection results of the plurality of field units. 这样一来,图5所示的箭头的动态变化周期及变化量减小。 Thus, the dynamic variation period and the amount of change of the arrow shown in FIG. 5 is reduced. 即APL的相应可变区域中的光源控制电平的变化周期变大,变化量变小。 I.e., light source control level change period corresponding to the variable region of the APL increases, variation becomes small. 因而,能够更改善灯可靠性下降的情况。 Thus, it is possible to more improve the reliability of the lamp decrease. 下面参照图6更具体说明该效果。 More specifically below with reference to FIG. 6 described this effect. 图6所示为K4的情况, 上图的粗虚线表示每3个单位场的APL的检测结果的平均值。 Figure 6 shows the case of K4, the thick broken line in FIG detection result represents the average value of the APL unit every three fields. 根据该平均值如图6的下图所示来控制光源控制电平。 The lower the average value as shown in FIG. 6 controls the light source control levels shown. 因此,通过根据多个单位场时间的APL 的平均值来控制光源,与图4所示的情况相比,能够减少光源控制电平的变动, 更改善光源可靠性下降的情况。 Thus, according to the average value of the APL by a plurality of unit field time to control the light source, compared with the case shown in FIG. 4, it is possible to reduce the variation of the light source level control, and more improved reliability of the light source decline. 另外,图示虽然省略,但作为能够提供与根据上述多个单位场时间的APL 平均值的控制类似效果的构成,也可以在APL检测单元2的输出侧插入LPF。 Further, although not illustrated, but similar effects can be provided as the APL control in accordance with an average value of the plurality of unit field time configuration, may be inserted at the output side of the LPF APL detection unit 2. 但是,在根据APL平均值进行控制的情况下,由于能够正确地以整数规定对象场数为K的数值,另外,还可以利用程序设定等根据情况适当改变该K的数值, 因此例如在图5所示的相应可变区域中,在增加及减少光源辉度的情况下,还可以采用改变其变化速度这样的控制方法。 However, in the case of controlling the average value according to the APL, it is possible to correct the number of objects in a field of a predetermined integer value K, in addition, it may also be programmed using the K value appropriately changed according to the situation, thus, for example, in FIG. a respective variable region shown in Figure 5, increases and decreases in the case where the light source luminance can also be controlled by changing the change rate of such method. 另外,作为第1实施形态是说明了动态控制光源的情况,但对于能够控制最终照射显示元件的光量的其他情况,也同样能够采用本发明。 Further, the first embodiment illustrates the case where the dynamic control of the light source, but is possible to control the final amount of the light irradiated to other display element, the present invention can be similarly employed. 下面说明将本实施形态的光源控制方法用于光圈控制及调光元件控制时的图象显示装置的构成及工作情况。 The light source control method will be described below according to the present embodiment is used when the iris image and a dimming control device controls the display configuration and operation of the device. 图7所示为将第1实施形态的光源控制方法用于光圈控制时的图象显示装置的构成方框图。 Figure 7 is a block diagram illustrating the light source apparatus control method of the first embodiment of the image display control for the diaphragm. 在图7中,图象显示装置具有APL检测单元2、光圈控制数据生成单元19、光圈驱动电路20、光源驱动电路5、光源6、光学系统17、显 In FIG. 7, the display device having an image APL detection unit 2, the control data generating unit diaphragm 19, the diaphragm drive circuit 20, a light source driving circuit 5, the light source 6, an optical system 17, which was

示元件8、图象信号处理电路9、显示元件驱动单元IO、微型计算机ll及定时器12。 8 shows elements, an image signal processing circuit 9, a display element driving the IO unit, the timer 12 and the microcomputer ll. 光学系统17包含光圈18。 The optical system 17 comprises an aperture 18. 另外,在图7中对于与图1相同的构成,附加相同的参照符号,并省略其说明。 Further, in FIG. 7 to FIG. 1 in the same configuration, the same reference numerals, and description thereof is omitted. 下面说明该图象显示装置的工作情况。 The following describes the operation of the image display apparatus. 光圈控制数据生成单元19生成与APL检测结果相应的光圈控制数据。 Iris control data generating unit 19 generates a detection result corresponding to the APL diaphragm control data. 生成的光圈控制数据输入至光圈驱动电路20。 The iris control data generation circuit 20 is inputted to the diaphragm drive. 光圈驱动电路20根据与光圈控制数据相应的驱动条件,动态地驱动光圈18,改变光圈18的遮光量。 The diaphragm drive circuit 20 and the diaphragm control data corresponding to driving conditions, the diaphragm 18 is dynamically driven, the diaphragm 18 changes the amount of shielding. 由光源6发出的光由光学系统17聚焦,作为与显示元件8的显示范围相对应的照明光照射于显示元件8。 Focusing light emitted from the light source 6 by the optical system 17, illumination light is irradiated as the display element 8 corresponding to the range displayed on the display device 8. 这时,照射显示元件8上照射的光量与根据光圈18的遮光量进行调节。 In this case, the irradiation light irradiated from the display element 8 is adjusted according to the amount of the aperture 18 of the shielding. 下面参照图8及图9,说明光圈控制数据生成单元19的具体处理内容。 Referring to FIG. 8 and FIG. 9, specific processing contents diaphragm control data generating unit 19. 图8所示的Ala及A2a为预先设定的APL的阈值。 Ala and A2a is shown in FIG. 8 APL threshold value set in advance. Ala及A2a的阈值电平是分别区分黑暗场景及明亮场景用的阈值,可根据电影软件的评价得到。 Ala and A2a threshold level is a threshold value to distinguish between a dark scene respectively, and bright scenes, the film can be obtained according to the evaluation software. 在采用电影软件以外的明亮场景多的软件等情况下,也可以根据图象源改变这些阈值的设定。 In the case of movie software other than the software, and more bright scenes, may be changed to set these thresholds based on the image source.

在图8中,作为光量控制的第1模式(固定区域Low),是在输入图象信号1的APL小于阈值Ala时,使光量控制电平为Lla (min),保持一定。 In FIG. 8, a first mode (fixing region Low) light amount control, when the input image signal is the APL is smaller than a threshold value Ala, the light amount control level of Lla (min), kept constant. 作为第2模式(相应可变区域),是在输入图象信号1的APL为阈值Ala〜阈值A2a吋,随着APL变化在Lla (min)〜L2a(max)的范围内改变光量控制电平。 As the second mode (the corresponding variable region), the threshold value is a threshold value A2a inch Ala~ the APL of the input image signal 1, as modifications within the scope APL variation Lla (min) ~L2a (max) of the light quantity control level . 作为第3模式(固定区域High),是输入图象信号1的APL大于阈值A2a时, 使光源控制电平为L2a (max)保持一定。 As the third mode (fixing area High), the input image signal is greater than the threshold value APL 1 A2a, as the light source control level L2a (max) remains constant. 另夕卜,在图8中,设相应可变区域的APL (Ala〜A2a)与光源控制电平的关系为线性关系,但不限于此,也可以设为任意的非线想特性函数。 Another Bu Xi, in FIG. 8, the respective variable region set APL (Ala~A2a) is a linear relationship between the light source and the control level, but is not limited thereto, and may be set to any non-linear characteristic function like. 下面参照图9,具体说明输入图象信号1的APL的动态变化与光量控制电平的动态控制的关系。 Referring to FIG 9, particularly the relationship with the dynamic control of the dynamic change of the light amount of the input image signal 1 is controlled APL level. 在图9中,上图表示输入至光圈控制数据生成单元19 的输入APL的动态变化一个具体的例子,下图表示与上图所示的输入APL的动态变化对应的光量控制电平的动态控制。 In FIG. 9, the figure showing a dynamic change in the input APL is inputted to the iris control data generation unit 19 of a specific example, the figure shows dynamic control of the amount of light and the dynamic variation of the input APL is shown above a corresponding control level of . Tn为检测APL的单位场时间。 Tn the field as a unit time detection of APL. 根据前述图8所示的控制方法进行控制,使得对于APL的动态变化,在APL处于相应可变区域(Ala〜A2a)时,光量控制也动态跟踪,但在APL处于固定区域Low及固定区域High时,分别使光量控制电平为Lla (min)及L2a(max), 保持一定。 The control method of the control shown in FIG. 8, so that the dynamic change of the APL when the APL is in the corresponding variable region (Ala~A2a), dynamic tracking control is the amount of light, but when the APL is in a fixed region and a fixed region High Low when each of the light amount control level of Lla (min) and L2a (max), is kept constant. 另外,图9的下图所示的来自光圈控制数据生成单元19的输出信号不限于用实线表示的情况,也可以如用虚线所示的那样,考虑到光圈驱动构造的响应性及可靠性,使其对于APL的变化具有时间上延迟的特性。 Further, as shown below in FIG. 9, the output signal from the iris control data generating unit 19 is not limited to the case represented by the solid line, it may be used as shown as a dashed line, taking into account the reliability and responsiveness of the diaphragm actuating mechanism , its characteristics with respect to changes in APL in the delay time. 如上所述,在APL处于相应可变区域(Ala〜A2a)的情况下,光量控制电平如图8所示的箭头那样,根据输入图象信号1的APL变化,在相应可变区域动态转移。 As described above, in the case where the APL in the respective variable region (Ala~A2a), the light quantity control level as shown by the arrow 8, according to the APL variation in the input image signal 1, the variable region in the respective dynamic transition . 如上所述,采用图7所示的图象显示装置,通过对光圈进行动态驱动,能够根据图象场景动态调整光量,能够改善明亮场景的亮度感不足及黑暗场景的黑影浮现的问题,能够提高对比度感。 As described above, the image shown in FIG. 7 A display device, dynamically driven by the diaphragm, can dynamically adjust the amount of light according to image the scene, it is possible to improve the problem of lack of feeling of brightness and shadow dark scenes bright scenes emerge, it is possible improve the contrast feeling. 另外,在黑暗场景、即输入图象信号的APL小于规定阈值时,由于使光量控制电平为光圈控制区域的最小值,因此能够更进一步改善黑暗场景的黑影浮现问题,另外,在明亮场景、即输入图象信号的APL大于规定阈值时,由于使光量控制电平为光圈控制区域的最大值,因此能够更进一步改善明亮场景的亮度感不足的问题,结果能够更进一步提高对比度感。 Further, in dark scenes, i.e., the input image signal APL is smaller than a predetermined threshold value, since the light quantity control level is the minimum diaphragm control region, it is possible to further improve the dark scenes emerged shadow problem, and, in bright scenes , that the APL of the input image signal is greater than a predetermined threshold value, since the light quantity control level is the maximum aperture of the control region, it is possible to further improve the sense of the problem of insufficient brightness of a bright scene, the result can be further improved contrast feeling. 另外,在控制光源时,由于光源稳定点灯这一点,光源控制的最小值L1较大(最大值L2的1/3〜1/2左右),在黑暗场景不能使光量足够小,而在控制光圈时,能够使光量控制的最小值Lla足够小(原理上也能够为0)。 Further, when the control light, since this light stable lighting, the light source control of the minimum value L1 larger (maximum value L2 is about 1 / 3~1 / 2), the amount of light can not sufficiently small dark scenes, and the control aperture when the value of the minimum light amount control Lla sufficiently small (in principle it is possible to 0). 结果在黑暗场景能够使黑色电平足够低,能够更好地改善黑影浮现感,同时还能够增大与明亮场景的相对的对比度之比。 Results in a dark scene can be made sufficiently low black level, can be more improved sense of shadows emerge, while also increasing the relative ratio of the contrast of a bright scene. 另外,在控制光源时,由于投影装置使用的放电光源的寿命可靠性这一点, 若光源功率变化速度较快,或变化反复次数较多,则存在有损寿命时间的问题, 但在控制光圈时,虽然也取决于光圈的开闭构造,但是光圈驱动条件的变化速度及变化次数对光圈驱动构造的可靠性的影响与控制光源的情况相比要小。 Further, when controlling the light source, since the life of the discharge light source using projection means that the reliability, the power source if the speed changes rapidly, or more changes in the number of iterations, the problem of the presence of detrimental lifetime, but when the iris control , although depending on the opening and closing of the diaphragm structure, but the number of changes in speed and changes in the diaphragm as compared to the case where the drive conditions affect the reliability of the drive and control the light source diaphragm structure is smaller. 因此,例如对于APL的变化,也能够以场/帧为定位使其跟踪光圈的驱动条件, 能够大大改善图象场景亮度急剧变化时的跟踪性能,能够根据场景亮度变化得到良好的对比度感。 Thus, for example, the APL variation can be a field / frame to be positioned so as to track the driving condition of the diaphragm, can greatly improve the tracking performance when an abrupt change in image scene brightness, a good sense of contrast can be obtained according to the scene luminance variation. 另外,投影装置使用的放电光源大致区分为氙灯光源及高压汞灯光源,与氙灯光源相比,高压汞灯光源在上述点上难以确保可靠性,另外,若改变驱动功率(亮度),则发光光谱也有发生变化的倾向。 Further, discharge sources is roughly divided into a projection apparatus using a high-pressure mercury lamp xenon light source and a light source, xenon light source compared with the high-pressure mercury lamp light source is difficult to ensure reliability on the point, Further, if the change in the drive power (brightness) of the light emitting there is a tendency spectrum changes. 因此,在用高压汞灯光源时, 光圈控制则特别有效。 Thus, when the light source with a high pressure mercury lamp, a diaphragm control is particularly effective. 另外,还可以同时进行光源控制及光圈控制这两种控制。 Further, the light source control can also control and aperture control both simultaneously. 在这种情况下, 由于对比度改善效果是利用光源控制的对比度改善效果与利用光圈控制的对比度改善效果的积,因此对于对比度的改善更为有效。 In this case, since the effect of improving contrast it is to improve the contrast effect and improved product utilizing iris control using the contrast effect of the light source control, and therefore more effective in improving contrast. 这时,通过设定使得光圈的变化速度比光源的变化速度要快,就能够排除对光源的寿命可靠性的恶劣影响,而且能够改善光量对图象场景变化的跟踪性能。 In this case, by setting the aperture so that the rate of change is faster than the light source changes, it is possible to eliminate the adverse effect on the reliability of the life of the light source, and light quantity tracking performance can be improved for the image scene changes. 图IO所示为将第1实施形态的光源控制方法用于调光元件控制时的图象显示装置的构成方框图。 As shown in FIG IO block diagram illustrating a display device as the light source control method for the first embodiment of an image when the light adjustment control element. 在图10中,图象显示装置具有APL检测单元2、调光元件控制数据生成单元22、调光元件驱动电路23、光源驱动电路5、光源6、 调光元件21、光学系统7、显示元件8、图象信号处理电路9、显示元件驱动单元10、微型计算机11及定时器12。 In FIG 10, the image display device having APL detection unit 2, the dimming element control data generating unit 22, the dimming element driver circuit 23, a light source driving circuit 5, the light source 6, the dimming element 21, an optical system 7, a display device 8, the image signal processing circuit 9, a display element driving unit 10, the microcomputer 11 and the timer 12. 另外,在图10中对于与图1相同的构成,附加相同的参考附号,并有略其说明。 Further, in FIG. 10 of the same configuration in FIG. 1, denoted by the same reference number is attached, and a description thereof is omitted. 另外,在图10所示的构成中,是将调光元件21设置在光学系统7的前级,但也可以如图ll所示,将调光元件21设置在光学系统24的内部。 Further, in the configuration shown in FIG. 10, the dimming element 21 is provided at the front stage of the optical system 7, but may be as shown in FIG ll, the dimming element 21 is internally provided in the optical system 24. 下面说明图IO所示的图象显示装置的工作情况。 The following describes a display image shown in FIG IO device operation. 调光元件控制数据生成单元22生成与APL检测结果相应的调光元件控制数据。 Dimming element control data generating unit 22 generates a corresponding detection result of the APL dimming control data element. 生成的调光元件控制数据输入至调光元件驱动电路23。 Dimming element generated control data is input to the light modulation element driving circuit 23. 调光元件驱动电路23根据与调光元件控制数据相应的驱动条件,动态驱动调光元件21,改变调光元件21的透射率。 Dimming element driving circuit 23 according to the driving condition data corresponding to the dimming control element, dynamic dimming element driver 21, changing the transmittance of the light modulation element 21. 由光源6发出的光透过调光元件21,利用光学系统7聚焦,作为与显示元件8的显示范围相对应的照射光线照射显示元件8。 6 emitted by the light source passes through the light modulation element 21, using the focusing optical system 7, as the display range of the display element 8 corresponding to the light irradiation device 8 display. 这时, 照射显示元件8的光量与调器元件21的透射率相应进行调节。 In this case, the irradiation light amount of the display device 8 and the transmittance of the adjuster element 21 is adjusted correspondingly. 下面参照图12及图13说明调光元件控制数据生成单元22的具体处理内容。 Referring now to Figures 12 and 13 illustrate dimming control element specific processing contents data generating unit 22. 图12所示的Alb及A2b为预先设定的APL的阈值。 Alb and A2b APL shown in FIG. 12 is a threshold value set in advance. Alb及A2b的阈值电平分别为区分黑暗场景及明亮场景用的阈值,可根据电影软件的评价得到。 Alb and A2b threshold level of the threshold value are distinguished dark scenes and bright scenes, the film can be obtained according to the evaluation software. 在采用电影软件以外的明亮场景多的软件等情况下,也可以根据图象源改变这些阈值的设定。 In the case of movie software other than the software, and more bright scenes, may be changed to set these thresholds based on the image source. 在图12中,作为光量控制的第l模式(固定区域Low),是在输入图象信号1的APL小于阈值Alb时,使光量控制电平为Lla (min),保持一定。 In FIG. 12, as the mode l (fixing region Low) light amount control, when the input image signal is smaller than the threshold value APL 1 AIb, the light amount control level of Lla (min), kept constant. 作为第2模式(相应可变区域),是在输入图象信号1的APL为阈值Alb〜阈值A2b时,相应于APL的变化在Lib (min) ~L2b (max)的范围内改变光量控制电平。 As the second mode (the corresponding variable region), in the APL of the input video signal 1 is a threshold Alb~ threshold A2b, corresponding to a change in the APL ~ the range L2b (max) is changed Lib (min) light amount control circuit level. 作为第3模式(固定区域High),是输入图象信号1的APL大于阈值A2b时,使光源控制电平为L2b (max),保持一定。 As the third mode (fixing area High), the input image signal is greater than the threshold value APL 1 A2b, the light source control level is L2b (max), is kept constant. 另外,在图12中,设相应可变的APL (Alb〜A2b)与光源控制电平的关系为线性关系,但不限于此,也可以是任意的非线性函数。 Further, in FIG. 12, provided the corresponding variable APL (Alb~A2b) relationship with the light source control level is a linear relationship, but is not limited thereto, but may be any non-linear function. 下面参照图13具体说明输入图象信号1的APL的动态变化与光量控制电平的动态控制的关系。 Referring specifically to FIG 13 illustrates the relationship of the dynamic change of the dynamic control of light amount of the input image signal 1 is controlled APL level. 在图13,上图表示输入至调光元件控制数据生成单元22 的输入APL的动态变化一个具体例子,下图表示与上图所示的输入APL的动态变化对应的光量控制电平的动态控制。 In Figure 13, the figure represents an input to a specific example of an input APL dynamic variation of the light element control data generating unit 22 is adjusted, the lower figure shows dynamic control of the amount of light and the dynamic variation of the input APL is shown above a corresponding control level of . Tn为检测APL的单位场时间。 Tn the field as a unit time detection of APL. 根据前述图12所示的控制方法进行控制,使得对于APL的动态变化,在APL为相应可变区域(Alb〜A2b)时,光量控制也动态跟踪,但在APL处于固定区域Low及固定区域High时,使光量控制电平分别为Lib (min)及L2b (max), 保持一定。 Is controlled according to the control method shown in FIG. 12, so that the dynamic change of the APL when the APL is the corresponding variable region (Alb~A2b), dynamic tracking control is the amount of light, but when the APL is in a fixed region and a fixed region High Low when the light quantity control level respectively Lib (min) and L2b (max), is kept constant. 另外,图13的下图所示的调光元件控制数据生成单元22的输出信号不限于用实线表示的情况,也可以如用虚线所示的那样,考虑到调光元件的响应性及可靠性,使其对于APL的变化具有时间上的延迟特性。 Further, as shown below in FIG. 13 dimming element control data generating unit 22 an output signal is limited to the case represented by the solid line, it may be used as shown as a dashed line, considering the dimming element responsive and reliable resistance, so that the change in the APL having the time delay characteristics. 如上所述,在APL处于相应可变区域(Alb〜A2b)时,光量控制电平如图12所示的箭头那样,根据输入图象信号1的APL变化,在相应可变区域动态转移。 As described above, when the APL is in a respective variable region (Alb~A2b), the light quantity control level as shown by arrow in FIG. 12, changes according to the APL of the input image signal 1, the variable region in the respective dynamic transition. 如上所述,如果采用图10或图11所示的图象显示装置,可以通过动态驱动调光元件,根据图象场景动态地调整光量,能够改善明亮场景的亮度感不足及黑暗场景的黑影浮现的问题,能够提高对比度感。 As described above, if the image shown in FIG. 10 or display device 11 may be driven by dynamic light modulating device, an image scene dynamically adjusted according to the amount of light can be improved feeling of lack of shadows and brightness of a bright scene dark scenes the problem surfaced, can improve the contrast feeling. 另外,在黑暗场景、即输入图象信号的APL小于规定阈值的情况下,由于使光量控制电平为光圈控制区域的最小值,因此能够更进一步改善黑暗场景的黑影浮现的问题,另外,在明亮场景、即输入图象信号的APL大于大于规定阈值的情况下,由于使光量控制电平为调光控制区域的最大值,因此能够更进一步改善明亮场景的亮度感不足的问题,结果能够更进一步提高对比度感。 In the case where, in dark scenes, i.e., the input image signal APL is smaller than a predetermined threshold value, since the light quantity control level is the minimum diaphragm control region, it is possible to further improve the problem of shadow dark scenes emerge, in addition, in bright scenes, i.e., the input image signal is greater than a case where the APL is greater than a predetermined threshold value, since the maximum level of the light quantity control of the light control region is adjusted, it is possible to further improve the feeling of insufficient luminance of a bright scene, and the result can be further improve the contrast feeling. 另外,在控制调光元件时, 一般能够得到与前述控制光圈情况同样的效果。 Further, when the dimming control element, generally controls the diaphragm can be obtained with the case where the same effect. 另外,与控制光源的情况相比,由于控制调光元件时调光元件驱动电路也可以以比较简单的电路、以低电压实现,因此更容易实现。 Further, compared with the case of controlling the light source, since the light modulating device when the dimming control element driving circuit may be a relatively simple circuit to achieve a low voltage, and therefore easier to implement. 再有,与控制光圈的情况相比,控制调光元件的情况下从光源到显示元件之间有配置自由度,而且对于调光元件的驱动,不需要可动结构,仅利用驱动电路进行电气控制,因此能够以比较简单的结构实现,所以更容易实现。 Further, as compared with the control aperture, a case where the dimming control element from a light source arranged to have a degree of freedom between the display element and the drive element of the dimmer, the movable structure does not need to be performed only by driving the electrical circuit control, it is possible to achieve a relatively simple configuration, it is easier to achieve. 另外,还能够同时进行光源控制及调光元件控制这两种控制,在这种情况下,能够得到与同时进行光源控制和光圈控制这两种控制时同样的效果。 Further, the light source is also possible to simultaneously control and dimming control of two control elements, in this case, it is possible to obtain same effects for light source control and control and aperture control both simultaneously. 再有, 还能够同时进行光源控制、光圈控制及调光元件控制。 Further, also capable of controlling the light source, and a dimming iris control element controlled simultaneously. 在这种情况下,由于对比度改善效果是利用光源控制的对比度改善效果、利用光圈控制的对比度改善 In this case, since the effect of improving the contrast is the light source control of the contrast improving effect, the use of contrast enhanced iris control

效果、以及利用调光元件控制的对比度改善效果之积,因此对于对比度的改善更为有效。 Effect, and contrast control element using the dimming effect of improving the product, and therefore more effective in improving contrast. 第2实施形态图14所示为本发明第2实施形态有关的图象显示装置的构成。 The second embodiment shown in FIG. 14 the image relating to the second embodiment of the display device in the present invention. 图象显示装置具有APL检测单元2,光源控制数据生成单元13、 LPF4、光源驱动电路5、 光源6、光学系统7、显示元件8、图象信号处理电路9、显示元件驱动单元10、 微型计算机11及定时器12。 APL detection device having an image display unit 2, the light source control data generation unit 13, LPF4, the light source driving circuit 5, the light source 6, an optical system 7, a display device 8, an image signal processing circuit 9, a display 10, a microcomputer unit drive element 11 and the timer 12. 另外,本实施形态与第1实施形态的不同点仅仅是光源控制数据生成单元13的工作。 Further, the present embodiment differs from the first embodiment only working light source control data generating unit 13. 因此,对于其他相同的构成,附加相同的参照符号,并省略说明。 Thus, the same for the other configuration, the same reference numerals, and description thereof is omitted. 下面参照图15,说明光源控制数据生成单元13的工作。 Referring to FIG 15, the operation of light source control data generating unit 13. 光源控制数据生成单元13除了第1实施形态的光源控制数据生成单元3的处理以外,再加上缓和光源电平控制对于APL变化的动态跟踪特性用的处理。 Light source control data generation processing unit 13 in addition to the first embodiment of the light source control data generating unit 3, coupled with the ease light source level control process for dynamic tracking characteristic with changes in the APL. 通过这样,减少灯的驱动功率条件的状态转移频度,进一步改善灯可靠性下降的情况。 By reducing the driving power condition of the lamp the frequency of state transition, to further improve the reliability of the lamp decrease. 下面参照图15进行具体说明。 It will be specifically described with reference to FIG 15. 图15所示为输入图象信号1的APL的动态变化与光源控制电平的动态控制的关系。 As shown in the input image signal is dynamically controlled light source control and dynamic changes of the level of the APL 15 in FIG. 1 relationship. 在图15中,上图表示输入至光源控制数据生成单元13的输入APL的动态变化一个具体例子,下图表示与上图所示的输入APL动态变化对应的光源控制电平的动态控制。 In Figure 15, the figure shows the input to the APL variation in the input dynamic light source control data generation unit 13 of a specific example, the figure shows the control input APL Dynamic Dynamic changes shown in the figure corresponds to light source control level. 特别是在下图中,实线表示来自光源控制数据生成单元13的输出信号,虚线表示来自LPF4的输出信号。 Particularly in the lower diagram, the solid line represents the output signal from the light source control data generation unit 13, a broken line indicates the output signal from the LPF4. Tn为检测APL的单位场时间。 Tn the field as a unit time detection of APL. 如图15所示,在本实施形态中,与第1实施形态相同,根据前述图3所示的控制方法进行控制,使得对于APL的动态变化,在APL处于相应可变区域(A1〜A2)时,光源控制也进行动态跟踪,但在APL处于固定区域Low及固定区域High时,分别使光源控制电平为Ll (min)及L2 (max),保持一定。 , In the present embodiment, the same form of the first embodiment shown in FIG 15, is controlled according to the control method shown in Figure 3, so that the dynamic change of the APL, the APL in the respective variable region (A1~A2) when, also dynamic tracking light source control, but when the APL is in a fixed region and a fixed region High Low, respectively, as the light source control level Ll (min) and L2 (max), is kept constant. 但是,在本实施形态中,判断输入APL的变化是否小于预先设定的判断阈值APmin的电平,在APL的变化小于APmin时,优先于上述通常的控制,不使光源控制电平发生变化。 However, in the present embodiment, whether the input APL variation is smaller than the level of the predetermined determination threshold APmin is, when the variation of the APL is smaller than APmin, in preference to the normal control, not to the light source control level change. 更具体地说,在图15的上图中,时间tl〜t2的APL 的变化电平小于判断阈值APmin。 More specifically, FIG. 15 in the above figure, the time tl~t2 APL level is less than the variation determination threshold APmin. 因而,如图15的下所示,在时间t2不进行光源控制电平的动态变化控制,维持时间tl的光源控制电平。 Thus, as shown in the FIG. 15, the light source is not performed to control the level of dynamic change in the control time t2, the light source control to maintain the level of the time tl. 在本实施形态中,如上所述,对于微小的APL的变化,不使光源控制电平跟踪。 In the present embodiment, as described above, for small changes in the APL, not to control the level of the tracking light. 这是由于,若对于微小的APL变化一一都使光源控制电平进行跟踪,则与提高对比度的优点相比,损害光源可靠性的缺点更大,因此是不理想的。 This is because, if the light source are eleven tracking control level in response to minute changes in the APL, as compared with the advantage of increasing the contrast, light damage disadvantage greater reliability, and therefore it is not preferable. 如上所述,采用第2实施形态,则除了第1实施形态的效果之外,还由于在APL的变化微小时不改变光源的驱动条件,保持片刻之前的驱动条件,因此能够减少光源驱动条件的动态转移频度。 As described above, the second embodiment, in addition to the effects of the first embodiment, but also due to changes in the APL source without changing the driving condition of the minute, the holding moment before the driving conditions, driving the light source can be reduced conditions dynamic transition frequency. 结果能够改善光源稳定点灯性能恶化及寿命特性恶化的问题,提高光源可靠性。 Problems will result in improved light stable lighting performance deteriorates and the deterioration of life characteristics, improving the reliability of the light source. 另外,第2实施形态的控制方法也能够适用于光圈及调光元件的控制。 Further, the control method of the second embodiment can be applied to control the aperture and the light modulating elements. 下面分别说明将第2实施形态的控制方法用于光圈控制及调光元件控制的情况。 The following will illustrate a second embodiment of a control method for a case where the dimming control and iris control element. 图16所示为将第2实施形态的控制方法用于光圈控制时的输入图象信号1 的APL动态变化与光圈控制电平的动态控制的关系。 Dynamic control of the relationship between the input image shown in FIG. 16 is a control method of the second embodiment of a diaphragm control signal for dynamic changes of APL aperture control level 1. 在这种情况下,在APL 的变化小于预先设定的判断阈值APmin时,不使光量控制电平变化。 In this case, the APL is smaller than the variation determination threshold value set in advance APmin, not to change the level of light amount control. 这样,能够防止由于光圈驱动机构重复进行过度微小的动作而引起的光圈驱动机构可靠性的下降。 Thus, it is possible to prevent a decrease in reliability due to the diaphragm driving mechanism driving the diaphragm mechanism is repeated over slightest movement caused. 图17所示为将第2实施形态的控制方法用于调光元件控制时的输入图象信号1的APL动态变化与调光元件控制电平的动态控制的关系。 FIG dynamic control of the relationship between the input image and the dynamic change of the dimming APL signal 1 is a control element of the second embodiment of the method for dimming control element of the control level 17 shown in FIG. 在这种情况下, 在APL的变化小于预先设定的判断阈值APmin时,不使光量控制电平变化。 In this case, the APL is smaller than the variation determination threshold value set in advance APmin, not to change the level of light amount control. 这样,能够防止由于调光元件反复进行过度微小的调光动作而引起的调光元件可靠性的下降。 Thus, to prevent a decrease in reliability due to the light control element is repeated over the dimming element slight dimming operation caused. 第3实施形态图18所示为本发明第3实施形态有关的图象显示装置的构成。 The third embodiment shown in FIG. 18 the image relating to the third embodiment of the display device in the present invention. 图象显示装置具有APL检测单元2、光源控制数据生成单元14、 LPF4、光源驱动电路5、 光源6、光学系统7、显示元件8、图象信号处理电路9、显示元件驱动单元10、 微型计算机11及定时器12。 APL detection device having an image display unit 2, a light source control data generation unit 14, LPF4, the light source driving circuit 5, the light source 6, an optical system 7, a display device 8, an image signal processing circuit 9, a display 10, a microcomputer unit drive element 11 and the timer 12. 另外,本实施形态与第1实施形态的不同点仅仅是光源控制数据生成单元14的工作。 Further, the present embodiment differs from the first embodiment only working light source control data generating unit 14. 因此,对于其他相同的构成,附加相同的参照符号,并省略说明。 Thus, the same for the other configuration, the same reference numerals, and description thereof is omitted. 下面参照图19,说明光源控制数据生成单元14的工作。 Referring to FIG 19, the operation of light source control data generating unit 14. 光源控制数据生成单元14除了第1实施形态的光源控制数据生成单元3的处理以外,再加上缓和光源电平控制对APL变化的动态跟踪特性用的处理。 Light source control data generation processing unit 14 in addition to the first embodiment of the light source control data generating unit 3, coupled with the ease of handling the light source level control the dynamic tracking characteristic with changes in the APL. 通过这样,减少灯的驱动功率条件的状态转移频度,进一步改善灯可靠性下降的情况。 By reducing the driving power condition of the lamp the frequency of state transition, to further improve the reliability of the lamp decrease. 下面参照图19 进行具体说明。 Referring to Figure 19 will be specifically described. 图19所示为输入图象信号1的APL的动态变化与光源控制电平的动态控制的关系。 Figure 19 shows the input image signal, and changes dynamically control the dynamic light source control level APL 1 relationship. 在图19中,上图表示输入至光源控制数据生成单元14的输入APL的 In FIG. 19, the view showing light input to the control data generating unit 14 inputs the APL

动态变化一个具体例子,下图表示与上图所示的输入APL动态变化对应的光源控制电平的动态控制。 Dynamic changes of a specific example, the figure shows the control input APL Dynamic Dynamic changes shown in the figure corresponds to light source control level. 特别是在下图中,实线表示来自光源控制数据生成单元14的输出信号,虚线表示来自LPF4的输出信号。 Particularly in the lower diagram, the solid line represents the output signal from the light source control data generation unit 14, a broken line indicates the output signal from the LPF4. Tn为检测APL的单位场时间。 Tn the field as a unit time detection of APL. 如图19所示,在本实施形态中,与第1实施形态相同,根据前述图3所示的控制方法进行控制,使得对于APL的动态变化,在APL处于相应可变区域(A1〜A2)时,光源控制也动态跟踪,但在APL处于固定区域Low及固定区域High时,分别使光源控制电平为L1 (min)及L2 (max),保持一定。 , In the present embodiment, the same form of the first embodiment shown in FIG 19, is controlled according to the control method shown in Figure 3, so that the dynamic change of the APL, the APL in the respective variable region (A1~A2) when the light source is also dynamic tracking control, but when the APL is in a fixed region and a fixed region Low High, the light source control level respectively as L1 (min) and L2 (max), is kept constant. 但是,在本实施形态中,判断光源驱动电平是否转移至Ll(min)或L2(max), 在转移至L1 (min)或L2 (max)时,优先于上述通常的控制,在规定期间保持该光源驱动电平。 However, in the present embodiment, determines the light source drive level is transferred to Ll (min) or L2 (max), transfer to L1 (min) or L2 (max), in preference to the normal control, the predetermined period holding the light source drive level. 具体地说,在图19的上图中,时间tlO的APL小于阈值Al,光源控制电平如图19的下图所示,状态转移至L1 (min)的电平。 More specifically, in FIG. 19 of the above figure, the time tlO APL is smaller than the threshold value Al, the light source control level as shown in FIG. 19, the state proceeds to L1 (min) level. 一旦光源驱动条件转移至L1 (min),则光源控制数据生成单元14在预先规定的期间T1与APL的变化无关地,以L1 (min)的状态保持输出不变。 Once transferred to the driving conditions of the light source L1 (min), the light source control data generation unit 14 changes the APL T1 regardless of a predetermined time period, in a state L1 (min) of the output remains unchanged. 一旦期间T1在时间tl2结束, 则与第1实施形态相同,进行与APL变化对应的通常处理。 Once the end of the period T1 at time tl2, the same as in the first embodiment, the normal process corresponding to the APL variation. 同时,时间t20的APL大于阈值A2,光源控制电平的状态转移至L2(max) 的电平。 Meanwhile, the time t20 is greater than the threshold value APL A2, the light source control level state is transferred to L2 (max) level. 一旦光源驱动条件转移至L2 (max),则光源控制数据生成单元14 在预先规定的期间T2与APL的变化无关地,以L2 (max)的状态保持输出不变。 Once transferred to the driving conditions of the light source L2 (max), the light source control data generation unit 14 changes the APL T2 regardless of the predetermined time period, in a state L2 (max) of the output remains unchanged. 若期间T2在时间t22结束,则与第1实施形态相同,进行与APL变化对应的通常处理。 If the end of the period T2 at the time t22, the same as in the first embodiment, the normal process corresponding to the APL variation. 在本实施形态中,如上所述,一旦光源驱动电平转移至Ll(min)或L2(max), 则在规定期间对APL的变化不使光源控制电平跟踪。 In the present embodiment, as described above, once transferred to a light source drive level Ll (min) or L2 (max), the predetermined period without change on the APL level of the tracking light source control. 这样具有减少光源驱动条件动态转移频度的效果,能够改善光源稳定点灯性能劣化及寿命特性降低的问题,提高光源的可靠性。 This has the effect of reducing the illumination source drive conditions of dynamic transition frequency can be improved light stable lighting performance deteriorates and the life characteristic deteriorates, improve the reliability of the light source. 再有,特别是在光源控制电平转移至L1 (min)时保持输出,这具有别的优点。 Further, when transferred to a holding output L1 (min), particularly in the light source level control, which has other advantages. 例如,在APL于Al的前后频繁变化这样的情况下, 若不像本实施形态那样保持光源控制电平,则由于是比较黑暗的场景,因此容易感觉到光源辉度的变化。 For example, before and after the APL of Al changes frequently such a case, as like the present embodiment, when holding the light source level control, since relatively dark scenes, it is easy to feel the change in the luminance of a light source. 这是因为,人的视觉对于黑暗场景的亮度变化比对于明亮场景的亮度变化更敏感,对亮度变化的灵敏度高。 This is because the human visual luminance variation is more sensitive than the dark scene to a bright scene luminance variation, a high sensitivity to changes in brightness. 因而,防止该APL在Al前后的频繁亮度变化,对于提高显示图象的品位也是有效的。 Accordingly, to prevent frequent change in brightness before and after the Al APL, for improving the quality of the displayed image is also effective. 如上所述,采用第3实施形态,除了第1实施形态的效果之外,还由于光源驱动电平一旦转移至L1 (min)或L2 (max),则不使光源驱动条件变化地, 保持片刻之前的驱动条件,因此能够减少光源驱动条件的动态转移频度。 As described above, the third embodiment, in addition to the effects of the first embodiment, but also the light source drive level once transferred to L1 (min) or L2 (max), the light source is not driving conditions change, the holding moment prior to driving conditions, driving conditions of the light source can be reduced dynamic transition frequency. 结果能够改善光源稳定点灯性能劣化及寿命特性降低的问题,提高光源的可靠性。 Results can be improved light stable lighting performance deteriorates and the life characteristics of the problem, to improve the reliability of the light source. 另外,还能够提高图象的显示图象品位。 Further, the display image can also be improved image quality. 另外,在本实施形态中,是输入APL转移至A1以下或A2以上时起规定的期间维持光源控制电平不变,但不限于此,例如可以从实际的光源功率达到最小或最大时起的规定期间维持光源控制电平不变,也可以从其他时刻起规定期间维持光源控制不变。 Further, in this embodiment, it is transferred to the input APL A1 or A2 or less than a predetermined time period from the light source to maintain the same level of control, but is not limited thereto, for example, from the minimum or the maximum reach of the power source from the actual predetermined sustain period light source control level remains constant light source control may be constant during a predetermined time from the other. 下面参照图20,说明该变形例。 Referring to FIG 20, the modification described. 在这一变形例中,光源控制数据生成单元与输入APL的变化对应,如图20 的下图所示,利用数字处理运算进行控制,使光源控制电平的可变特性具有时间上的延迟。 In this modified embodiment, the light source control data generating unit changes the input corresponding to the APL, as shown at FIG. 20, is controlled by the digital processing operation, the control characteristics of the source of the variable level having a time delay. 具体来说,在图20的上图中,时间tlO的APL小于阈值A1,光源控制电平利用该光源控制数据生成单元的时间上的延迟作用,在时间tll如图20的下图所示,状态转移至L1 (min)电平。 Specifically, in FIG. 20 of the above figure, the time tlO APL is smaller than the threshold value A1, the light source control level using the delay time of the action on the light source control data generating unit 20 at the time tll FIG. As shown, state transition to L1 (min) level. 一旦光源驱动条件转移至Ll (min),则在预先规定期间TT与APL的变化无关地,以Ll (min)的状态保持输出不变。 Once transferred to the driving conditions of the light source Ll (min), then the change in a predetermined period regardless of the APL TT in a state Ll (min) of the output remains unchanged. 若期间Tl'在时间t12结束,则与第1实施相同,进行与APL 变化对应的通常数据。 If the period Tl 'at the end of the time t12, the same as in the first embodiment, with the normal data corresponding to changes in the APL. 同样,时间t20的APL大于阈值A2,光源控制电平利用该光源控制数据生成单元的时间上的延迟作用,在时间t21状态转移至L2 (max)电平。 Similarly, time t20 APL is larger than the threshold A2, a light source control level using the delay time of the action on the light source control data generation means and transferred to L2 (max) state level at time t21. 一旦光源驱动条件转移至L2 (max),则在预先规定期间T2,与APL的变化无关地, 以L2 (max)的状态保持输出不变。 T2, irrespective of the change in the APL source during driving conditions once transferred to L2 (max), at a predetermined, state L2 (max) of the output remains unchanged. 若期间T2,在时间t22结束,则与第1实施相同,进行与APL变化对应的通常处理。 If the period T2, at the end of the time t22, the same as in the first embodiment, the process proceeds generally corresponding to the APL variation. 另外,第3实施形态的控制方法也能够适用于光圈及调光元件的控制。 Further, the control method of the third embodiment can be applied to control the aperture and the light modulating elements. 例如在对图8所示的光圈的动态控制采用本实施形态的控制方法时,从输入APL 转移至Ala以下或A2a以上时起的规定的期间,将光量控制电平分别维持在Lla (min)或L2a (max)。 Predetermined period of time, for example, the dynamic control of the diaphragm of FIG. 8 using the control method according to the present embodiment, the transfer from the input APL to Ala or less, or A2a more from the time of the light amount control levels were maintained at Lla (min) or L2a (max). 通过这样,能够减少光圈驱动条件的动态转移频度,结果能够防止光圈驱动结构可靠性的降低。 With this, the driving condition of the diaphragm can be reduced dynamic transition frequency, the result is possible to prevent reduction of reliability of the diaphragm drive structure. 另外,例如在对图12所示的调光元件动态控制采用本实施形态的控制方法时,从输入APL转移至Alb以下或A2b以上时起的规定期间,将光量控制电平分别维持在Llb(min)或L2b (max)。 During a predetermined Further, for example, when the dimming element 12 shown in FIG dynamic control using the control method of the embodiment of the present, is transferred from the input APL to Alb less or A2b more from the time of the light amount control levels were maintained at LLB ( min) or L2b (max). 通过这样,能够减少调光元件驱动条件的动态转移频度,结果能够防止调光元件可靠性的降低。 By this way, it is possible to reduce the frequency dynamic transfer element dimming driving conditions, the result is possible to prevent decrease of the dimming element reliability. 第4实施形态图21所示为本发明第4实施形态的图象显示装置的构成。 Apparatus constituting a fourth embodiment of the image shown in FIG. 21 a fourth embodiment of the present invention. 图象显示装置具 Image display means having

有APL检测单元2、直方图生成单元15、光源控制数据生成单元16、 LPF4、 光源驱动电路5、光源6、光学系统7、显示元件8、图象信号处理电路9、显示元件驱动单元10、微型计算机11及定时器12。 There APL detection unit 2, the histogram generation unit 15, a light source control data generation unit 16, LPF4, the light source driving circuit 5, the light source 6, an optical system 7, a display device 8, an image signal processing circuit 9, a display element driving unit 10, The microcomputer 11 and the timer 12. 另外,本实施形态与第1实施形态的不同点仅仅是另外具有直方图生成单元15以及光源控制数据生成单元16的工作。 Further, the present embodiment differs from the first embodiment is merely additionally having a working histogram generation unit 15 and light source control data generating unit 16. 因此,对于其他相同的构成,附加相同的参照符号,并省略说明。 Thus, the same for the other configuration, the same reference numerals, and description thereof is omitted. 在图21中,图象信号1输入至图象信号处理电路9、直方图生成单元15及APL检测单元2。 In FIG 21, a video signal input to the image signal processing circuit 9, the histogram generation unit 15 and the APL detection unit 2. 直方图生成单元15在每个单位场期间,根据输入图象信号l 的辉度信号分量,检测将输入图象信号电平分割成任意多个辉度电平区的每个分割区的直方图分布。 The histogram of each partition histogram generation unit 15 during each field unit, in accordance with the luminance signal component of the input image signal l, the detection signal level of the input image equally cut into any of a plurality of luminance level region distributed. 该检测结果输入至光源控制数据生成单元16。 The detected result is inputted to the light source control data generating unit 16. 在光源控制数据生成单元16,根据APL检测结果及直方图生成结果,生成光源控制数据。 16, to generate the result according to the APL and the histogram of the detection result of the light source control data generation unit that generates light source control data. 下面参照图22,说明直方图生成单元15的具体工作情况。 Referring to FIG 22, a specific operation of the histogram generation unit 15. 在直方图生成单元15中,从0%至100%的信号电平被预先分割为几个辉度电平(在图中为H1〜H4区的4个区),对每个单位场检测输入的图象信号1在每个上述分割区的直方图分布。 In the histogram generating unit 15, from 0% to 100% signal level is previously divided into several luminance level (four regions H1~H4 region in the drawing), each unit for detecting an input field an image signal distribution in the histogram for each of the divided regions. 该直方图生成结果被输入至光源控制数据生成单元16。 The result is inputted to the histogram generation light source control data generating unit 16. 在光源控制数据生成单元16中,将分割区中最接近黑色电平的H1区的值与预先规定的阈值HTL进行比较。 Value of the light source control data generation unit 16, a divided region nearest to the black level H1 region and a predetermined threshold value are compared HTL. 在比较的结果是Hl区的值小于HTL时, 光源控制数据生成单元16与第1实施形态相同,根据前述图3所示的控制方法进行控制,使得对于APL的动态变化,在APL处于相应可变区域(A1〜A2) 时,光源控制也动态跟踪,但在APL处于固定区域Low及固定区域High时, 分别使光源控制电平为L1 (min)及L2 (max),保持一定。 In the result of the comparison value Hl region is less than the HTL, the light source control data generation unit 16 same as the first embodiment, the control according to the control method shown in Figure 3, that the dynamic variations of APL, the APL may be in the respective when the changing area (A1~A2), dynamic tracking control is light, but when the APL is in a fixed region and a fixed region Low High, the light source control level respectively as L1 (min) and L2 (max), is kept constant. 另外,在H1区的值大于HTL时,与APL无关地,判断为黑暗场景,光源控制数据生成单元16优先于与上述第1实施形态相同的通常控制,将光源驱动控制电平设定为Ll (min),改善显示图象的黑影浮现。 Further, when the value H1 region is greater than the HTL, irrespective of the APL, it is determined that a dark scene, the light source control data generation unit 16 in preference to the above-described first embodiment, the same normal control, the light source drive control level is set to Ll (min), to improve the display image shadow emerge. 在黑暗场景中仅存在一部分存在特别明亮部分那样的情况下,APL由于受到该特别明亮部分的影响而变大,因此不能根据APL判断为黑暗场景。 In the presence of only a portion of the dark scenes In particular, the presence of a bright portion as, due to the impact of the APL particularly bright portion becomes large, and therefore can not be determined according to the APL is a dark scene. 但是,如本实施形态那样,根据直方图分布来判断黑暗场景,这样,即使是在黑暗场景中仅一部分存在特别明亮部分那样的情况,也可以判断为黑暗场景。 However, as in this embodiment as a dark scene is determined based on the histogram distribution, so that, even in the presence of particularly bright portion in such a case only part of the dark scene, it may be determined as a dark scene. 另外,在本实施形态中,是设直方图分布的分割区数量为4,但不限于此, 也可以是任意分割区数量。 Further, in the present embodiment, it is provided a histogram distribution partition number is 4, but is not limited thereto, but may be any number of partitions. 另外,各分割辉度电平的分割范围(宽度)设为25% Further, each divided luminance level division range (width) is set to 25%

宽度,但不限于此,也可以是任意的分割范围,还可以每个分割区的范围大小不相同。 Width, but is not limited thereto, but may be an arbitrary division range, the range may not be the same as the size of each partition. 另外,在本实施形态中,光源控制数据生成单元16是根据H1区的直方图分布值生成光源控制数据的,但不限于此,可以根据作为目的的场景控制,使用其他分割区的辉度电平的直方图分布,或者也可以将多个直方图分布组合使用。 Further, in the present embodiment, the light source control data generation unit 16 generates a light source control data according to the distribution of values ​​in the histogram H1 region, but not limited thereto, according to the object of the scene to control using the luminance of the divided regions other electrically flat histogram distribution or histogram distribution plurality also may be used in combination. 另外,在本实施形态中,光源控制电平也设定为图3的L1 (min),但不限于此,也可以根据控制目的,将光源控制电平设定为L2 (max)或Ll (min) ~L2 (max)的范围内。 Further, in the present embodiment, the light source is also set to the control level of FIG L1 3 (min), but is not limited thereto, may be controlled according to the purpose, the light source control level is set to L2 (max) or Ll ( min) ~ in the range of L2 (max) of. 例如,也可以在根据直方图分布判断为明亮场景或不明不暗的场景时,与各APL值无关地,将光源控制电平设定为L2 (max)或Ll (min)〜L2 (max)的范围内。 For example, the time may be determined according to the histogram distribution is not unknown to a bright scene or a dark scene, it is not related to the APL value, the light source control level is set to L2 (max) or Ll (min) ~L2 (max) In the range. 另外,在本实施形态中,是判断H1区的值大于还是小于阈值HTL,并根据该判断结果以2种不同的模式进行光源控制电平的控制,但不限于此,例如也可以除了阈值HTL以外,追加别的阈值,增加条件判断模式,并根据该判断结果,取光源控制电平的条件设定为多种模式。 Further, in the present embodiment, a determination value H1 region is greater than or less than the threshold value HTL, and light source control level controlled in two different modes according to the determination result, but not limited to, for example, may be in addition to the threshold HTL except that other additional threshold increase condition determination mode, and based on the determination result, taking light source control level conditions were set to various modes. 另外,第4实施形态动态是对动态控制光源的情况进行说明,但也可以将第4实施形态说明的光源控制方法用于光圈的控制及调光元件的控制。 Further, the fourth embodiment is a case where the dynamic control of the dynamic light source is described, but may also be explained a fourth embodiment of a control method for controlling the light source and the light modulating elements of the aperture. 下面简单说明将本实施形态的光源控制方法用于光圈的控制及调光元件的控制时的图象显示装置的构成。 Briefly described below constituting the light source apparatus control method of the present embodiment for controlling the image control and dimming of the aperture element when displaying. 图23所示为将第4实施形态的光源控制方法用于光圈的控制的情况下的图象显示装置的结构方框图。 As shown in FIG. 23 in the case where the image of the iris for controlling the light source control method of a fourth embodiment of a block diagram showing the structure of the apparatus. 在图23中,图象显示装置具有APL检测单元2、 直方图生成单元15、光圈控制数据生成单元25、光圈驱动电路20、光源驱动电路5、光源6、光学系统17、显示元件8、图象信号处理电路9、显示元件驱动单元10、微型计算机11及定时器12。 In FIG 23, the image display device 2 having APL detection means, the histogram generation unit 15, the control data generating unit diaphragm 25, the diaphragm drive circuit 20, a light source driving circuit 5, the light source 6, an optical system 17, a display device 8, FIG. image signal processing circuit 9, a display element driving unit 10, the microcomputer 11 and the timer 12. 光学系统17包含光圈18。 The optical system 17 comprises an aperture 18. 另外,在图23中,对于与图7或图21相同的构成,附加相同的参照符号。 Further, in FIG. 23, the same in FIG. 7 or FIG. 21 configuration, the same reference symbols. 光圈控制数据生成单元25与图21所示的光源控制数据生成单元16 —样,根据APL检测结果及直方图生成结果生成光圈控制数据。 Iris control data generation unit 25 shown light source control data generation unit 21 of FIG. 16-- like, generating iris control data in accordance with the detection results of APL and histogram generation results. 这样,即使在黑暗场景中仅在一部分存在特别明亮部分那样的情况下,根据APL检测结果不能判断为黑暗场景时也能够判断为黑暗场景,能够防止黑影浮现。 Thus, even if a part is present only in a particularly dark scene in a bright portion that case, it is possible according to the APL detection result of determination can not be determined as a dark scene to a dark scene, it is possible to prevent the shadow emerge. 图24所示为将第4实施形态的光源控制方法用于调光元件的控制的情况下的图象显示装置的构成方框图。 As shown in FIG. 24 is a block diagram showing the configuration of an image under a light source apparatus control method of the fourth embodiment, a case for controlling the dimming of the display element. 在图24中,图象显示装置具有APL检测单元2,直方图生成单元15,调光元件控制数据生成单元26、调光元件驱动电路23、 光源驱动电路5、光源6、调光以及21、光学系统7、显示元件8、图象信号处理电路9、显示元件驱动单元IO、微型计算机11及定时器12。 In Figure 24, the display device having an image APL detection unit 2, the histogram generation unit 15, the dimming element control data generating unit 26, the dimming element driver circuit 23, a light source driving circuit 5, the light sources 6, 21, and dimming, optical system 7, a display device 8, an image signal processing circuit 9, a display element driving the IO unit, the microcomputer 11 and the timer 12. 另外,在图24 中,对于与图IO或图21相同的构成,附加相同的参照符号。 Further, in FIG. 24, the same in FIG. 21 or FIG IO configuration, the same reference symbols. 调光元件控制数据生成单元26与图21所示的光源控制数据生成单元16 —样,根据APL检测结果及直方图生成结果生成调光元件控制数据。 Dimming element control data generating unit 26 shown light source control data generation unit 21 of FIG. 16-- like, generating a dimming element result generating control data according to the APL and the histogram detection result. 这样,即使在黑暗场景中仅一部分存在特别明亮部分那样的情况下,根据APL检测结果不能判断为黑暗场景时也能够判断为黑暗场景,防止黑影浮现。 Thus, even in dark scenes the presence of only a portion of the bright part such as a special case, it is possible according to the APL detection result of determination can not be determined as a dark scene is a dark scene, to prevent shadows emerge. 另外,在上面所述中简单说明了将第4实施形态的光源控制方法用于光圈的控制及调光元件的控制时的各图象显示装置的构成,但也可以同时进行光源的控制及光圈的控制,也可以同时进行光源的控制和调光元件的控制,也可以同时进行光源的控制,光圈的控制及调光元件的控制。 Further, in the above configuration will be briefly described a method of controlling the light source apparatus of the fourth embodiment for each picture and the dimming control of the aperture element during the display, but may be controlled at the same time the light source and aperture the control may be performed while controlling the light source and the dimming control element may be controlled to control the light source, and the dimming control element aperture simultaneously. 下面简单说明这些情况下的图象显示装置的构成。 The following briefly described apparatus constituting an image displayed in these cases. 图25所示为将第4实施形态的光源控制方法用于光源及光圈的控制时的图象显示装置的构成方框图。 It is a block diagram illustrating an image of the light source apparatus control method of the fourth embodiment for controlling the light source and the diaphragm when the display shown in FIG. 25. 在图25中,图象显示装置具有APL检测单元2、 直方图生成单元15、光圈控制数据生成单元25、光圈驱动电路20、光源控制数据生成单元16、 LPF4、光源驱动电路5、光源6、光学系统17、显示元件8、 图象信号处理电路9、显示元件驱动单元10、微型计算机11及定时器12。 In Figure 25, the display device having an image APL detection unit 2, the histogram generation unit 15, the control data generating unit diaphragm 25, the diaphragm drive circuit 20, a light source control data generation unit 16, LPF4, the light source driving circuit 5, a light source 6, The optical system 17, a display device 8, an image signal processing circuit 9, a display element driving unit 10, the microcomputer 11 and the timer 12. 光学系统17包含光圈18。 The optical system 17 comprises an aperture 18. 另外,在图25中,对于与图21或图23相同的构成, 附加相同的参照符号。 Further, in FIG. 25, the same in FIG. 21 or FIG. 23 configuration, the same reference symbols. 这样,即使在黑暗场景中仅一部分存在特别明亮部分那样的情况下,根据APL检测结果不能判断为黑暗场景时,也能够判断为黑暗场景,防止黑影浮现。 Thus, even in dark scenes the presence of only a portion of the bright part such as a special case, according to the APL detection result can not be determined as a dark scene is a dark scene can be determined that, to prevent shadows emerge. 图26所示为将第4实施形态的光源控制方法用于光源及调光元件的控制时的图象显示装置的构成方框图。 Figure 26 is a block diagram illustrating the light source apparatus control method of the fourth embodiment for controlling the image source and the light modulating element when displayed. 在图26中,图象显示装置具有APL检测单元2、直方图生成单元15、光圈控制数据生成单元26、调光元件驱动电路23、光源控制数据生成单元16、 LPF4、光源驱动电路5、光源6、调光元件21、光学系统7、显示元件8、图象信号处理电路9、显示元件驱动单元10、微型计算机11及定时器12。 In FIG 26, the image display device 2 having APL detection means, the histogram generation unit 15, the diaphragm control data generating unit 26, the dimming element driver circuit 23, the light source control data generation unit 16, LPF4, the light source driving circuit 5, the light source 6, the dimming element 21, an optical system 7, a display device 8, an image signal processing circuit 9, a display element driving unit 10, the microcomputer 11 and the timer 12. 另外,在图26中,对于与图21或图24相同的构成,附加相同的参照符号。 Further, in FIG. 26, the same in FIG. 21 or FIG. 24 configuration, the same reference symbols. 这样,即使在黑暗场景中仅一部分存在特别明亮部分那样的情况下,根据APL检测结果不能判断为黑暗场景时,也能够判断为黑暗场景, 防止黑影浮现。 Thus, even in dark scenes the presence of only a portion of the bright part such as a special case, according to the APL detection result can not be determined as a dark scene is a dark scene can be determined that, to prevent shadows emerge.

图27所示为将第4实施形态的光源控制方法用于光源、光圈及调光元件的控制时的图象显示装置的构成方框图。 When the image shown in FIG. 27 for controlling the light source, the aperture and the light modulating element is a block diagram illustrating a display device in the light source control method of the fourth embodiment. 在图27中,图象显示装置具有APL检测单元2、直方图生成单元15、光圈控制数据生成单元25、光圈驱动电路20、 调光元件控制数据生成单元25、调光元件驱动电路23、光源控制数据生成单元16、 LPF4、光源驱动电路5、光源6、调光元件2K光学系统17、显示元件8、图象信号处理电路9、显示元件驱动单元IO、微型计算机11及定时器12。 In FIG 27, the image display device having APL detection means 2, 15, aperture control data generating unit 25, the diaphragm drive circuit 20, a dimming element control data generating unit 25, the dimming element driver circuit histogram generation unit 23, a light source control data generating unit 16, LPF4, the light source driving circuit 5, the light source 6, the dimming element 2K optical system 17, a display device 8, an image signal processing circuit 9, a display element driving the IO unit, the microcomputer 11 and the timer 12. 光学系统17包含光圈18。 The optical system 17 comprises an aperture 18. 另外,在图27中,对于与图21、图23或图24相同的构成,附加相同的参照符号。 Further, in FIG. 27, with respect to FIG. 21, the same configuration as in FIG. 23 or FIG. 24, the same reference symbols. 这样,即使在黑暗场景中仅一部分存在特别明亮部分那样的情况下,根据APL检测结果不能判断为黑暗场景时,也能够判断为黑暗场景,防止黑影浮现。 Thus, even in dark scenes the presence of only a portion of the bright part such as a special case, according to the APL detection result can not be determined as a dark scene is a dark scene can be determined that, to prevent shadows emerge.

如上所述,通过将光源的控制与光圈或调光元件的控制加以组合,能够更有效地根据图象的场景动态地调整辉度,能够进一步改善明亮场景的亮度感不足及黑暗场景的黑影浮现的问题,能够提高对比度感。 As described above, by controlling the aperture control or dimming of the light source elements are combined, the scene image can be more effectively adjusted dynamically according to the luminance, the brightness can be further improved feeling of lack of shadows and dark scenes bright scenes the problem surfaced, can improve the contrast feeling.

第5实施形态 Embodiment 5

图28所示为本发明第5实施形态有关的图象显示装置的构成方框图。 Figure 28 relating to a fifth image block diagram illustrating an embodiment of a display device according to the present invention. 在图28中,图象显示装置具有显示元件8,光源6,反射镜27,聚光透镜28,投影透镜29,屏幕30, APL检测单元2,中间控制信号生成单元31,信号变化控制单元32,光源驱动单元5,图象信号处理单元9,显示元件驱动单元10及系统控制单元41。 In FIG 28, the image display device having a display element 8, a light source 6, a mirror 27, a condensing lens 28, projection lens 29, screen 30, APL detection unit 2, the intermediate control signal generating unit 31, the control unit 32 changes the signal light source driving unit 5, the image signal processing unit 9, a display element driving unit 10 and a system control unit 41. 另外,在图28中,对于与图l相同的构成,附加相同的参照符号。 Further, in FIG. 28, the same configuration of Figure l, the same reference symbols. 显示元件8具有光调制作用,光源6照射显示元件8。 A display having a light modulation effect element 8, the light source 6 is irradiated display element 8. 反射镜27、聚光透镜28及投影透镜29为照明光学系统,反射镜27将光源6照射的光加以反射, 聚光透镜28将光源6照射的光及用反射镜27反射的光加以聚光,投影透镜29 将显示元件8上显示的图象放大投影于屏幕30。 A mirror 27, a condensing lens 28 and the projection lens 29 of the illumination optical system, the light source 27 is irradiated to the reflecting mirror 6 to be reflected, the light 28 irradiating light source 6 and a condensing lens converging light to be reflected by the reflecting mirror 27 , a projection lens 29 8 display image displayed on an enlarged element 30 onto a screen. 另外,反射镜27及聚光透镜28为与图1所示的光学系统7相当的结构。 Further, the reflecting mirror 27 and a condenser lens 28 of the optical system configuration shown in FIG. 17 equivalent. 图象信号输入至APL检测单元2, 检测该输入的图象信号的APL,将检测结果作为APL信号输出。 Video signal input to the APL detection unit 2 detects APL of the input video signal, and outputs the detection result as an APL signal. 中间控制信号生成单元31根据APL检测单元2输出的APL信号,生成作为控制光源6的发光辉度用的光源控制信号的基础的中间控制信号。 The intermediate control signal generating unit 31 according to the APL signal output from the APL detection means, generates an intermediate control signal based on the light source luminance of the light source 6 is controlled by a control signal. 信号变化控制单元32控制中间控制信号生成单元31输出的中间控制信号的电平变化,生成控制光源6 的发光辉度用的光源控制信号后输出。 Intermediate 32 intermediate control signal the control unit changes the control signal generation unit 31 outputs a control signal level changes generates a control signal controlling the light source luminance of the light source 6 with the output. 光源驱动单元5以与来自信号变化控制单元32的光源控制信号对应的条件驱动光源6。 Light source driving unit 5 and the light source control signal from the control unit 32 changes the signal corresponding to the driving conditions of the light source 6. 图象信号处理单元9将输入的 An image signal processing unit 9 the input

图象信号处理成适合显示元件8显示的形式。 Image signal into a form suitable for display of the display element 8. 显示元件驱动单元10根据用图形信号处理单元9处理的图象信号驱动显示元件8。 The display element drive unit 10 drives the image signal processing unit 9 by processing the graphic signal display element 8. 系统控制单元41对上述各控制单元进行控制。 The system control unit 41 controls the respective control unit.

图29 (a)所示为APL检测单元2输出的APL信号随时间变化的一个例子, 图29 (b)所示为利用根据图29 (a)所示的APL信号生成的光源控制信号驱动的光源6的发光辉度随时间的变化。 For the use of (A) shown APL signal generated light source control signal for driving of FIG. 29 (a) is shown an example of a signal output from the APL APL detection unit changes with time, FIG. 29 (b) shown in FIG. 29 in accordance with luminance of the light source 6 changes with time.

下面参照图28及图29,详细说明本实施形态的图象显示装置的特别是有关光源6的发光辉度控制的工作。 Detailed description of the present embodiment in particular, the image display related to luminance of the light source apparatus 6 to control operation described below with reference to FIG 28 and FIG 29. 另外,关于图象信号处理单元9及显示元件驱动单元10的工作,由于是众所周知的,因此省略其说明。 Further, on the display element and the drive unit operates the image signal processing unit 10 9, as is well known, description thereof is omitted.

APL检测单元2对于输入的图象信号的辉度信号分量在每个单位场期间检测APL,并将检测结果作为APL信号输出。 APL detection means 2 for luminance signal components of the image signal inputted APL detecting unit during each field, the detection result as an APL signal output. 中间控制信号生成单元31根据设定的变换函数或变换表,在每个单位场周期将APL检测单元2输出的APL信号的电平加以变换,生成中间控制信号。 The intermediate control signal generating unit 31 according to the conversion table or conversion function is set, in each unit field period will be converted APL APL level of the signal output from the detection means, generates an intermediate control signal. 该中间控制信号是作为最终控制光源发光辉度电平用的光源控制信号的基础的信号。 The intermediate control signal as a basis for the final control light emission luminance of the light source control signal with a signal level. 中间控制信号是这样生成的, 即使得在APL高时光源6的发光辉度增加,在APL低时光源6的发光辉度降低。 The intermediate control signal is generated to increase the luminance of the light source 6 is obtained even at a high APL, luminance of the light source 6 is decreased at a low APL. 这里,变换函数或变换表可以预先装入中间控制信号生成单元31,也可以由系统控制单元41适当设定。 Here, conversion table or conversion function can be pre-loaded intermediate control signal generation unit 31, the system may also be controlled by appropriately setting unit 41. 中间控制信号由于是由图象信号的APL直接生成的信号,因此是跟踪图象信号的APL的变化在每个单位场周期发生变化的信号。 Since the intermediate control signal is a signal generated by the image signal APL directly, so the tracking signal change is the APL of an image signal changes in each unit field period. 信号变化控制单元32是根据设定的时间常数来控制每个单位场期间发生变化的中间控制信号的变化速度,通过这样将该中间控制信号变为具有缓慢变化速度的信号,作为光源控制信号输出。 Changed in the middle of the control unit 32 during a signal change per unit field is controlled according to the time constant change speed control signal, the signal becomes a signal having a slowly varying speed by the intermediate control such as the light source control signal output . 关于该信号变化控制单元32的详细工作情况将在后面叙述。 Details about the operation of the signal change control unit 32 will be described later. 光源驱动单元5以与光源控制信号对应的驱动条件驱动光源6,通过这样使光源6的发光辉度发生变化。 Light source driving unit 5 for driving the light source control signal corresponding to the condition of the drive source 6, such that the change by the luminance of the light source 6.

这里作为参考,考虑不用信号变化控制单元32而将中间控制信号直接输入至光源驱动单元5来控制光源6的情况。 Herein incorporated by reference, without considering the signal variation control unit 32 and the intermediate control signal is directly input to the light source driving unit 5 controls the light source 6. 在这种情况下,如上所述,中间控制信号由于是照原样直接反映图象信号的APL变化的信号,因此光源发的发光辉度也变成随之在每个单位场期间发生变化。 In this case, as described above, since the intermediate control signal is a direct reflection of the signal as it changes in the APL of the video signal, and therefore the light source luminance of hair also becomes changes will occur during each field unit. 这样,若以照原样直接反映APL变化的形式控制光源6的发光辉度,则发光辉度的变化过快,图象显现出闪烁状态,显示品位变差。 Thus, if the directly reflected as it is in the form of changes in the APL controlling luminance of the light source 6, luminance variation is made too fast, the image showing a blinking state, the display quality is deteriorated. 另外,光源驱动单元5及光源6由于对于控制状态的变化具有时间常数,因此辉度变化对于APL的变化产生滞后。 Further, the light source driving unit 5 and the light source 6 due to the change in control state having a time constant, for the luminance change hysteresis variation of APL. 这样,在例如由明亮场景突然变为漆黑场景等情况下,画面辉度滞后于场景变化而急剧发生变化, Thus, for example in a bright scene suddenly becomes dark scene, etc., the screen brightness abruptly changes a scene change occurs in the hysteresis,

形成具有非常不舒适感的图象。 Forming a picture of a very uncomfortable feeling. 另外,对于光源6,由于以照原样直接反映APL变化的形式来控制光源6的发光辉度,频繁改变发光状态,将引起电极的劣化加速,或者光源6的可靠性降低。 Further, the light source 6, since the form as it directly reflects changes in the APL controlling the luminance of the light source 6, a light emission state changes frequently, will cause accelerated deterioration of the electrode, or the light source 6 is decreased reliability. 因此,为了解决上述问题,考虑使中间控制信号通过低通滤波器,以此减少光源发光状态的变化。 Accordingly, in order to solve the above problem, consider the intermediate control signal through a low pass filter, thereby reducing variation of light emission state. 但是,用电气零部件构成的低通滤波器的时间常数最多达到0.1秒左右,由于光源6的辉度变化引起的画面辉度变化依然感觉到, 没有完全解决显示器品位变差的问题。 However, the time constant of the low-pass filter constituted by the electrical components to achieve up to about 0.1 seconds, since the change in the screen luminance change due to luminance light source 6 is still felt, does not completely solve the problem of poor display quality. 因此,在本实施形态中为了解决如上所述的由于感觉到画面辉度变化而引起的显示品位恶化的问题,设置信号变化控制单元32。 Accordingly, in the present embodiment, in order to solve the problem of deterioration of display quality due to the perceived brightness of the screen changes caused as described above, the control unit 32 changes setting signal. 利用该信号变化控制单元32来控制中间控制信号的变化速度,通过这样降低光源6的发光辉度的变化速度,使其达到感觉不到的程度。 Using the signal to control the control unit 32 changes the change speed of the intermediate control signal, so that by reducing the rate of change in luminance of the light source 6, to reach undetectable level. 因此,能够防止显示品位的恶化,同时进行高对比度感的显示。 Accordingly, it is possible to prevent the deterioration of display quality, high-contrast display at the same time being. 另外,作为使光源的发光辉度的变化速度降低得到的结果,能够减少光源6的发光状态的变化次数,防止光源6的可靠性降低。 Further, as a result of speed variations of the light source luminance of the obtained reduced, it is possible to reduce the number of changes of state of emission light source 6, the light source 6 to prevent the reduction in reliability. 另外, 为了防止由于感觉到光源6的发光辉度变化而引起的显示品位恶化,通过实验求得,如图29 (b)所示,假设使光源6的发光辉度从最低发光辉度Ll至最高发光辉度L2线性变化的情况下以及从最高发光辉度至最低发光辉度线性变化的情况下,所需要的时间T0至少为0.3秒,最好为这以上的变化速度,慢慢地使光源6的辉度变化即可。 In order to prevent the display quality due to the change in perceived luminance of the light source 6 due to the deterioration, determined experimentally, as shown in FIG 29 (b), it is assumed that the luminance of the light source 6 from the lowest to the luminance of Ll L2 issued at the highest luminance and the linear variation from the minimum to the case where a linearly varying luminance of the highest luminance of the time T0 required for at least 0.3 seconds, preferably more than this rate of change, so slowly 6 the light source luminance can change. 另外,这里只不过是利用假设使光源辉度从最高发光辉度至最低发光辉度线性变化时所需要的时间,及假设从最低发光辉度至最高发光辉度线性变化时所需要的时间间接表现所希望的变化速度的程度。 Further, assume here simply by using the light source luminance time to the highest luminance of the lowest luminance of a linear variation from the required time and to assume the lowest luminance of the highest luminance of a linear variation from the desired indirect the performance level of the desired speed of change. 不用说,在实际控制光源辉度上重要的当然是变化速度。 Needless to say, important in controlling the light source luminance actual rate of change of course. 下面详细说明承担上述那样的光源辉度变化速度的控制的信号变化控制单元32。 Assume the following detailed description of the signal change control unit controls the speed of the change in luminance as the light source 32. 图30所示为信号变化控制单元32的构成方框图。 FIG. 30 is a block diagram showing signal change unit 32 controls. 信号变化控制单元32包含比较器301,加法器302,减法器303,选择器304,差分计算器305, 比较器306及选择器307。 Signal change control unit 32 includes a comparator 301, an adder 302, a subtractor 303, a selector 304, a difference calculator 305, a comparator 306 and a selector 307. 下面说明其工作情况。 The following description of the operation. 中间控制信号生成单元31生成的中间控制信号输入至信号变化控制单元32。 Intermediate 31 intermediate control signal generating means generates a control signal input to the signal control unit 32 changes. 在信号变化控制单元32中,根据该中间控制信号生成光源控制信号,由选择器307输出。 A change in the signal control unit 32 generates a light source control signal based on the intermediate control signal, output by the selector 307. 由选择器307输出的光源控制信号反馈至比较器301,加法器302及减法器303。 Feedback from the light source control signal output from the selector 307 to the comparator 301, an adder 302 and a subtracter 303. 信号变化控制单元32将1个单位场期间前的光源控制信号在加法器302或减法器303中与来自系统控制单元41的变化量设定信号相加或相减,通过这样对每个单位场期间依次更新光源控制信号后输出。 Signal change control unit 32 before the light source control signal during a field setting unit amount of change from the system control unit 41 in the adder 302 or a subtractor 303 the signal addition or subtraction, so that the field through each unit It outputs a control signal sequentially updated during light. 该变化量设定信号如前所述,用图29设定变化量,设定为达到不感觉到光源6的发光辉度变化速度的程度那样的变化量。 The change amount setting signal as described above, by setting the change amount of FIG. 29, the change amount is set to an extent not to feel the speed change luminance of the light source 6 as. 输入的中间控制信号在比较器301中, 与1个单位场期间前的光源控制信号进行比较,用选择器304根据该比较结果, 选择加法器302的输出或减法器303的输出中的某一个将其输出。 Intermediate input control signal in the comparator 301, and a light source control signal before the unit period field is compared with the selector 304 based on the comparison result, selecting one of the outputs of the adder 302 or the output of the subtractor 303 in its output. 例如当前单位场期间的中间控制信号电平大于1个单位场期间前的光源控制信号电平时, 加法器302的输出即1个单位场期间前的光源控制信号加上规定的变化量从选择器304输出。 The current variation during the intermediate field control unit is greater than the signal level of the control signal before the light field during a unit level, the output of adder 302 before the light source control signal that is a period by adding a predetermined field units from the selector 304 output. 这里,通过任意设定来自系统控制单元41的变化量设定信号, 能够自由控制光源控制信号的变化速度。 Here, the amount of change from the system control unit 41 set by arbitrarily setting signal, the rate of change can be freely controlled light source control signal. 另外,光源控制信号的更新间隔也可以不是每个单位场期间,而是每隔几个单位场期间,通过这样能够更减慢光源控制信号的变化速度。 During the addition, the light source control signal, the update interval may not every field unit, but every field period of a few units, with such a light source can be more slow down the rate of change in the control signal. 这是因为,光源控制信号的变化速度与由变化量设定信号设定的变化量除以光源控制信号的更新间隔的商成正比。 This is because the rate of change of the light source control signal set by the change amount setting signal by dividing the amount of change is proportional to the light source control signal supplier update interval. 差分计算器305取得选择器304的输出与中间控制信号的差分。 Difference calculator 305 acquires the selector 304 outputs the differential signal and the intermediate control. 来自该差分计算器305的差分输出在比较器306中与由系统控制单元41输入的误差量设定信号进行比较。 The differential output from the differential calculator 305 setting the error signal is compared to the amount entered by the system control unit 41 in the comparator 306. 结果,在差分计算器305的差分输出小于误差量设定信号时,在选择器307中选择输入的中间控制信号,通过这样将中间控制信号照原样直接作为光源控制信号输出。 As a result, when the differential calculator 305 outputs differential error amount is smaller than the setting signal, the selection input of the selector 307 in the intermediate control signal, the control signal output by the light source so that the intermediate control signal as it directly as. 另外,在差分计算器305的差分输出大于误差量设定信号时,在选择器307中选择来自选择器304的输出,通过这样将该输出作为光源控制信号输出。 Further, the differential outputs of the differential calculator 305 is greater than the amount of the error signal is set, the selector 304 selects the output from the selector 307, the control signal output by the light source such as the output. 另外,根据误差量来选择中间控制信号及选择器304 的输出加以输出,这虽然不一定是必须的,但若这样根据误差量设定信号选择输出,则利用变化量设定信号的设定值,尽管中间控制信号的电平为一定,但选择器304的输出不稳定而处于振荡状态这样的问题能够防止,因此是比较理想的。 Further, according to the amount of error is selected and the intermediate control signal the output of the selector 304 to be output, although this is not always necessary, but if so setting signal selects the output according to the error amount, the change amount set by the setting value signal this problem, although the intermediate level of the control signal is constant, but the output of the selector 304 and is in an unstable oscillation state can be prevented, and therefore is more desirable. 另外,为了确实防止振荡状态,误差量最好设定为变化量的一半大小。 In order to reliably prevent oscillation state, the error amount is preferably set to be half the size change amount. 如上所述,采用第5实施形态,与APL的高低联动控制光源6的发光辉度, 进行控制使得在例如电影软件那样的APL低的黑暗场景中降低光源6的发光辉度,所以能够改差画面黑影浮现等显示图象品位恶化的问题,能够提供更高品位的图象。 As described above, the fifth embodiment, luminance of the light source 6 in conjunction with the APL level control, control is performed so as to reduce luminance of the light source 6, for example, in dark scenes with low APL, as the movie software, it is possible to change the difference problems emerge like shadow screen display image quality deterioration, it is possible to provide higher quality images. 而且,特别是利用信号变化控制单元32,将光源6的发光辉度变化速度降低到收视者不感到光源辉度变化的程度,通过这样具有能够显示没有不舒适感的图象,而且还能够防止光源6的寿命特性降低等很大的效果。 Further, in particular by changes in the signal control unit 32, will reduce the rate of change in luminance of the light source 6 to the viewer does not feel the degree of change in luminance of the light source, so that by having the image can be displayed without an uncomfortable feeling, but also preventing reduced life characteristics of the light source 6 and the like large effect. 第6实施形态图31所示为本发明第6实施形态有关的图象显示装置的构成。 The sixth embodiment shown in FIG. 31 the image relating to the sixth embodiment of the display device in the present invention. 另外,由于图31所示的图象显示装置与图28所示的图象显示装置的不同点仅仅是信号变 Further, since the image 31 shown in FIG display device shown in FIG. 28 differs from the image display apparatus becomes simply a signal

化控制单元33及系统控制单元42,因此对于其他构成的说明则省略。 And a system control unit 33 of the control unit 42, and therefore the description thereof will be omitted for the configuration of the other. 另外, 在图31中,对于与图28相同的构成,附加相同的参照符号,并省略说明。 Further, in FIG. 31, FIG. 28 for the same configuration, the same reference numerals, and description thereof is omitted.

在本实施形态中,信号变化控制单元33与第5实施形态一样,控制在中间控制信号生成单元31中生成的中间控制信号的变化速度,生成控制光源6的发光辉度用的光源控制信号。 In the present embodiment, the signal change control unit 33 in the fifth embodiment, as controlling the intermediate control the intermediate signal generating unit 31 generates a control rate of change signal to generate a control light source control signal luminance of the light source 6 is used. 但是控制变化速度,以使得与增加光源6的发光辉度时的发光辉度变化速度相比,减少发光辉度时的变化速度更快。 However, the speed change when the luminance of the speed change control, so that the increase in the luminance of the light source 6 is reduced compared to the time rate of change of light emission luminance faster. 下面详细说明信号变化控制单元33的工作情况。 The following detailed description of operation of the control unit 33 of the signal changes.

图32 (a)所示为APL检测单元2输出的APL信号随时间变化的一个例子, 图32 (b)所示为利用根据图32 (a)所示的APL信号生成的光源控制信号驱动的光源6的发光辉度随时间的变化。 FIG 32 shows an example of a signal output from the APL APL detection unit changes with time, FIG. 32 (b) shows the use of APL signal shown in (a) generating a control signal for driving the light source in accordance with FIG. 32 (a) luminance of the light source 6 changes with time.

信号变化控制单元33以设定的时间常数控制每个单位场期间发生变化的中间控制信号的变化速度,变换为具有缓慢变化速度的光源控制信号。 Changed in the middle of the time constant during a signal change control unit 33 controls each unit to set the rate of change in the control signal field, is converted into light source control signal having a slowly varying speed. 这时进行控制,使其检测中间控制信号是向使得光源6的发光辉度增加的方向变化,还是反之向使得发光辉度减少的方向变化,在控制使其向降低光源6的发光辉度的方向变化时,与向增加发光辉度的方向控制时相比,加快光源控制信号的变化速度,使光源6的发光辉度的变化加快速度。 In this case is controlled so as the intermediate control signal detecting that the light source is varied to increase the luminance of the 6 direction, or vice versa such that the direction of change in luminance of reduction in the control so as to reduce the luminance of the light source 6 when the direction of change, compared with the control to increase the emission luminance direction, speed variation of the light source control signal, so that changes in luminance of the light source 6 speed. 即如图32 (a)及图32 (b)所示,若假设使光源6的发光辉度从最低发光辉度电平Ll变为最高发光辉度电平L2时的时间为时间T1,则进行控制,使得光源6的发光辉度从最大发光辉度电平L2变为最低发光辉度电平L1时的时间为小于时间T1的时间T2。 I.e., FIG. 32 (a) and FIG. 32 (b) as shown, assuming that the luminance of the light source 6 from the lowest emission luminance level Ll becomes the highest emission luminance level L2 at the time is the time T1, the performs control such that the luminance of the light source 6 from the maximum emission luminance level L2 when the time becomes the minimum luminance of less than the level L1 time T1 T2. 另外, 在该情况下,当然重要的也是变化速度。 In addition, in this case, of course, important is the speed of change.

图33所示为信号变化控制单元33的结构。 Structural unit 33 as shown in FIG. 33 is a control signal change. 这里,信号变化控制单元33与图30所示的第5实施形态的信号变化控制单元32的不同点仅仅是从系统控制单元42对加法器302及减法器303分别输入变化量设定信号这一点,对于其他相同构成的说明则省略。 Here, a fifth embodiment of the signal change control unit 33 shown in FIG. 30 differs from the signal control unit 32 changes only the system control unit 42 from the adder 302 and the subtractor 303 inputs this change amount setting signal respectively for additional description of the same configuration will be omitted.

在信号变化控制单元33中,对加法器302在辉度增加时输入变化量设定信号,对减法器303在辉度减少时输入的变化量设定信号。 In the signal change control unit 33, when the 302 input of the adder increases the luminance change amount setting signal, the change amount setting signal to the subtracter 303 when the input luminance reduction. 通过这样构成信号变化控制单元32,能够分别设定将光源6的发光辉度增加时及减少时的变化速度。 By constituting the signal variation control unit 32, respectively, can be set to the luminance of the light source 6 at the time of increasing the speed and reduce variation. 而且,通过将辉度减少时的变化量设定信号始终设定为大于辉度增加时的变化量设定信号的阈值,这样能够更加快向光源6的辉度降低的方向变化时的发光辉度的变化速度。 Furthermore, by reducing the amount of change when the luminance signal is always set to the setting when the change amount is greater than a set threshold increasing luminance signal, so that the emission brightness can be more accelerated in a direction in the change in the luminance of the light source 6 is reduced the rate of change degrees.

然而,如前所述,若光源辉度的变化速度加速,则感觉到光源辉度的变化, However, as described above, if the rate of change in luminance light acceleration, the change in perceived luminance light source,

显示图象的品位恶化。 Display image quality deterioration. 根据这一观点,则最好光源辉度的变化速度最好是慢些。 According to this view, the best rate of change in luminance of the light source is preferably slower. 但是,特别是电影软件等,存在很多较黑暗的场景,特别是由于在黑暗场景产生黑影浮现而引起的显示图象品位下降是应该避免的问题。 However, especially in movie software, there are many darker scenes, the display image quality especially due to the generation emerge in the dark shadows caused by the decline in the scene should be avoided problems. 因此,在由黑暗场景变为明亮场景时,为了尽量抑制对光源辉度的变化的感觉,要使光源辉度比较慢地变化,另一方面,在由明亮场景变为黑暗场景时,为了尽量抑制黑影浮现的产生,要使光源辉度比较快地变化,通过这样进行控制,能够在整体上提高显示图象的品位。 Thus, when a bright scene becomes a dark scene, as much as possible in order to suppress the luminance change of feel of the light source, the light source luminance to make changes relatively slowly, on the other hand, when a bright scene becomes a dark scene, in order to try suppressed shadow emerge, to make the light source luminance change relatively quickly, with such control, the display image quality can be improved as a whole. 另外,由于根据图象的变化迅速降低光源'6的发光辉度,因而利用图象辉度降低与光源发光辉度降低而产生的相乘的作用的效果,能够使收视者感到图象辉度更进一步变暗,在将黑暗场景作为重要场景的电影软件中,能够显示更具效果的图象。 Further, due to the rapid reduction 'luminance of the light source 6 changes according to the image, and thus the effect of using the image effect multiplied by the luminance decrease and light emitting luminance reduction generated, it enables the viewer to feel the image luminance further darkening the dark scene in a movie software as an important scene, the image can be displayed more effect. 如上所述,采用第6实施形态,通过控制使光源6的发光辉度向降低方向变化时的变化速度比控制使光源6的发光辉度向增加方向变化时的变化速度快,能够抑制图象场景从黑暗场景变为明亮场景时由于光源6的辉度变化而引起的不自然感,特别是图象场景变为黑暗场景时,通过更快地降低光源6的发光辉度,能够改善由于光源6的发光辉度高而引起的黑影浮现等显示品位的降低,在整体上改善显示图象的品位。 As described above, the sixth embodiment, by controlling a luminance of the light source 6 to change speed reduction ratio control change direction so that the luminance of the light source 6 to increase the speed of change when the direction of change fast, the image can be suppressed unnatural feeling scene becomes bright scenes from a dark scene since the luminance change caused by the light source 6, especially when the image scene is a dark scene changes, by quickly reducing the luminance of the light source 6 can be improved since the light source high brilliant hair caused by shadows exhibit reduced emergence of six grade, improved quality of the display image as a whole. 第7实施形态图34所示为本发明第7实施形态的图象显示装置的构成方框图。 A block diagram of apparatus constituting a seventh embodiment of an image 34 shown in FIG seventh embodiment of the present invention. 另外,由于图34所示的图象显示装置与图28所示的图象显示装置的不同点仅仅是信号变化控制单元34,光源发光辉度状态检测单元35及系统控制单元43,因此对于其他相同的构成,附加相同的参照符号,并省略说明。 Further, since the image shown in FIG. 34 means the display image shown in FIG. 28 differs from the display apparatus merely changes the signal control unit 34, the light source luminance of the state detection unit 35 and a system control unit 43, so for other the same configuration, the same reference numerals, and description thereof is omitted. 在本实施形态中,信号变化控制单元34与第5实施形态相同,是控制在中间控制信号生成单元31生成的中间控制信号的变化速度,生成控制光源6的发光辉度用的光源控制信号。 In the present embodiment, the signal change of the control unit the same shape 34 in the fifth embodiment, is controlled in the middle of the control signal generation unit 31 generates intermediate control the speed of change of the signal, generating a control light source control signal luminance of the light source 6 is used. 光源发光辉度状态检测单元35 —直监视利用信号变化控制单元34输出的光源控制信号,根据光源6的发光状态的经过情况进行控制,将使得光源6的发光辉度跟踪APL的控制是暂时中断,还是重新开始。 The light source luminance of the state detection unit 35 - Direct monitoring by a signal change of the light source control signal control unit 34 output is controlled in accordance with elapsed emission state of the light source 6 will make luminance of the light source 6 tracking control APL is temporarily interrupted or start again. 该控制是通过例如从光源发光辉度状态检测单元35对信号变化控制单元34输出跟踪控制信号来进行的,信号变化控制单元34根据跟踪控制信号,将光源控制信号电平固定,通过这样使得光源辉度对APL的跟踪暂时中断。 This control is performed, for example the light source luminance of a state detecting unit 35 a signal change control unit 34 outputs a tracking control signal by the signal change control unit 34 in accordance with the tracking control signal, the light source control signal level is fixed, through such that the light source luminance tracking APL temporarily interrupted. 下面参照图35 (a)及图35 (b),详细说明根据光源发光辉度状态检测单 Referring now to Figures 35 (a) and FIG. 35 (b), described in detail in accordance with the light source luminance of the state detection unit

元35的控制引起的光源6的发光状态的变化。 6 changes state light emission control unit 35 caused. 图35 (a)所示为APL检测单元2输出的APL信号随时间变化的一个例子,图35 (b)所示为利用根据图35 (a)所示的APL信号生成的光源控制信号驱动的光源6的发光辉度随时间的变化。 FIG 35 (a) is shown an example of a signal output from the APL APL detection unit changes with time, FIG. 35 (b) shows the use of (A) shown APL signal generated light source control signal 35 is driven in accordance with FIG. luminance of the light source 6 changes with time. 在本实施形态中,光源发光辉度状态检测单元35对于发光辉度即不为最低发光辉度电平L1,也不为最高发光辉度电平L2,而在它们的中间区域持续转移的状态中的经过时间进行计数。 In the present embodiment, the light source luminance of a state detecting unit 35 to the emission luminance i.e. not the lowest emission luminance level L1, nor the maximum level of emission luminance L2, and continuous transfer of their state intermediate region the elapsed time is counted. 而且,在计数了由系统控制单元43预先设定的一定时间Ta时,光源发光辉度状态检测单元35对信号变化控制单元34送出跟踪控制信号,使得光源6的发光辉度跟踪APL变化仅中断一定时间Tb,并维持该中断时刻的发光辉度。 Further, when the counting by the system control unit 43 set in advance predetermined time Ta, the light source luminance of the state detection unit 35 sends a signal control unit 34 changes the tracking control signal, so that the luminance of the light source 6 is interrupted only track changes in the APL certain period of time Tb, and maintain the interruption time of emission brightness. 然后,经过中断期间Tb,进入等待状态, 等待假设利用光源控制信号进行光源6的控制不中断而继续时的发光辉度(图35 (b)的细线部分)与现在维持的光源6的发光辉度(图35 (b)的粗线部分) 处于规定的电平差以内之后,利用跟踪控制信号对信号变化控制单元34重新开始使光源6的发光辉度跟踪APL的控制,另外,上面是将重新开始光源控制的时刻作为等待假设利用光源控制信号进行光源6的控制不中断而继续时的发光辉度与现在维持的光源6的发光辉度处于规定的电平差以内之后,但不一定限于此,例如也可以在经过跟踪中断期间Tb之后立刻重新开始光源控制。 Then, after interruption period Tb, enters a wait state, waiting assumed that the light source control signal for controlling the light source 6 is not interrupted and continued when emission luminance (FIG. 35 (b) the fine line portion) is now sent to maintain the light source 6 after the luminance (FIG. 35 (b) thick line portion) is within a predetermined level difference, using the tracking control signal to the signal change control unit 34 restarts luminance of the light source 6 so that tracking control of the APL, additionally, the above is after the light source control resumes waiting time is assumed as the light source control signal for controlling the light source 6 is not interrupted when the luminance of the luminance of the current to continue to maintain the light source 6 is within a predetermined level difference, but not necessarily limited to this, for example, may be resumed immediately after the light source control track interruption period Tb. 但是,在等待假设利用光源控制信号进行光源6的控制不中断而继续时的发光辉度与现在维持的光源6的发光辉度处于规定的电平差以内之后重新开始跟踪的方法,由于没有因中断的光源控制立刻重新开始而引起的图象显示的不舒适感,因此是比较理想的。 However, waiting for assuming the light source control signal for controlling the light source 6 is not interrupted when the luminance of the current and continue to maintain the luminance of the light source 6 is within a predetermined method after the re-start tracking the level difference, due to the absence of discomfort interrupted light source image control immediately restart caused by display and is therefore ideal. 图36所示为本实施形态的光源发光辉度状态检测单元35的构成。 As shown in the present embodiment is composed of a light source luminance of the state detection unit 35 in FIG. 36. 信号变化控制单元34输出的光源控制信号输入至比较器501及比较器502。 The control unit 34 changes the signal output from the light source control signal is input to a comparator 501 and a comparator 502. 比较器501将光源控制信号与最高辉度(L2)设定进行比较,同样比较器502将光源控制信号与最低辉度(Ll)设定信号进行比较。 Comparator 501 and the light source control signal is the maximum luminance (L2) is set for comparison, the same comparator 502 and the minimum light source luminance control signal (Ll) setting signals are compared. 另外,最高辉度(L2)设定信号及最低辉度(Ll)设定信号都由系统控制单元43供给。 Further, the maximum luminance (L2) and the minimum luminance setting signal (Ll) a setting signal supplied by the system control unit 43. 比较的结果为现在的发光辉度处于大于最低辉度Ll而且小于最高辉度L2的中间状态时,由AND 电路503向定时器电路505输出控制信号。 When the result of the comparison is now greater than the minimum luminance of the luminance of the highest luminance is less than Ll and L2 of the intermediate state, the timer circuit 505 outputs a control signal to the AND circuit 503. 第1定时器电路505开始时间计数。 The first timer circuit 505 starts counting time. 在发光辉度处于中间状态的期间,第l定时器电路持续计数。 During the light emission luminance in an intermediate state, the first timer circuit l continues counting. 然后,若经过由系统控制单元43设定的设定时间Ta,则第1定时器电路505对信号变化控制单元34输出跟踪控制信号,中断跟踪APL的光源6的辉度控制,同时使第2 定时器电路506开始计数。 Then, when the set time by the system control unit 43 set Ta, the first timer circuit 505 changes the signal control unit 34 outputs a tracking control signal, the interrupt source luminance control track 6 of the APL, while the second the timer circuit 506 starts counting.

若经过由系统控制单元43设定的设定时间Tb,则第2定时器电路506向OR电路504送出控制电路,将第1定时器电路505清零。 If the set time by the system control unit 43 set the Tb, the second timer circuit 506 sends a control circuit to the OR circuit 504, the first timer circuit 505 is cleared. 若第1定时器电路被清零,则由第1定时器电路输出的跟踪控制信号被清零,允许重新开始信号变化控制单元34中的光源6的辉度控制。 When the first timer circuit is cleared, by the tracking control signal outputted from the first timer circuit is cleared, allowing the luminance control signal to restart the control unit 34 changes the light source 6. 信号变化控制单元34若检测到跟踪控制信号被清零,则比较现在维持的光源6的发光辉度与中间控制信号生成单元31输出的中间控制信号,在两者之差处于一定范围内时工作,使得重新开始光源6的辉度控制。 Intermediate signal change control unit 34 upon detecting a tracking control signal is cleared, comparison of the current to maintain luminance of the light source 6 and the intermediate control signal generating unit 31 outputs a control signal is within a certain range in the difference between the two working , so that the light source luminance control is restarted 6. 另外,在第1定时器电路505在计数过程中,发光辉度达到最高辉度(L2)或最低辉度(Ll)时,利用比较器501, 502及OR电路504,将第1定时器电路505清零。 Further, the first timer circuit 505 in the counting process, the luminance of the highest luminance (L2) or the lowest luminance (Ll), by the comparator 501, OR circuits 502 and 504, the first timer circuit 505 is cleared. 如上所述,采用第7实验形态,在图象显示装置的光源辉度控制中,在光源以中间状态持续一定时间(Ta)的辉度变化时,进行控制使得中断一定时间(Tb)对APL的跟踪,通过这样能够防止由于长时间使光源辉度持续变化而引起的光源寿命的降低。 As described above, the seventh aspect experiment, the light source luminance of the image display control apparatus, when the light source luminance variation for a certain time (Ta) to an intermediate state, control is performed so that the interrupt time constant (Tb) against APL tracking, this can be prevented by reducing the life of the light source due to prolonged duration of the light source luminance caused by variations. 另外,通过根据APL使光源辉度跟踪来提高显示质量,以及通过中断光源的辉度控制来改善光源寿命, 一般存在要折衷兼顾的关系。 Further, the luminance of the light source according to the APL to improve display quality tracking, and to improve the life of the light source by controlling the luminance of a light source interrupted, there is generally a trade-off relationship to be balanced. 因此,例如单纯每一次在规定的时刻每一次仅在规定的期间中断光源控制,这样做只不过与提高显示质量相比,单纯优先考虑改善光源寿命。 Thus, for example, simply every every interrupt source control at a predetermined time period prescribed only in doing so compared with just improve display quality, the simple priority to improve lamp life. 但是,在本实施形态中,由于只要光源在规定时间以上以中间状态持续辉度变化时,就暂时中断光源控制,因此能够得到超过单纯折衷关系的优点。 However, in the present embodiment, since the light source as long as the predetermined time or more intermediate luminance change state continues, the light source control temporarily interrupted, it is possible to obtain advantages over a simple trade-off relationship. 下面说明这种情况。 This situation will be described below. 作为与本实施形态比较用的假设例子,下面说明单纯每一次在规定的时刻每一次仅在规定的期间中断光源控制的情况。 As an example of this embodiment is assumed for comparison, will be described simply every interruption every light source control only in a predetermined period at a predetermined timing. 图37 (a)所示为该假设例子中由APL检测单元输出的APL信号随时间变化的一个例子。 FIG 37 (a) as shown by the example of one example APL APL detection unit outputs a signal varying with time for the hypothesis. 图37 (b)所示为利用根据图37 (a)所示的APL信号生成的光源控制信号驱动的光源的发光辉度随时间的变化。 FIG 37 is a variation using (b) shown in FIG. 37 according to luminance of the APL signal shown in (a) generating a control signal for driving the light source over time. 在该假设例子中,如图37 (a)所示,在APL信号电平为Y 以下时,以最低发光辉度Ll驱动光源,而为X以上时,以最高发光辉度L2 驱动。 In this hypothetical example, as shown in 37 (a), the signal level when the APL is Y or less, the lowest luminance of the light source driving Ll, and when X or more, the highest luminance of L2 drive. 在该假设例子中,由于单纯每一次在规定的时刻每一次仅在规定的期间中断光源控制,因此如图37 (b)的粗线部分是不中断光源控制时的光源的辉度变化。 In this hypothetical example, the light source control due to an interruption during each alone only once in every predetermined time in a predetermined, so the bold line portion in FIG. 37 (b) is the change in luminance of the light source when the light source control without interruption. 若来看粗线部分,则在比图中所示的"中断期间"前的期间中,光源辉度在短暂期间达到一定的电平L2。 When the bold line of view, then the period before the "interruption period" shown in FIG ratio, the luminance of the light source reaches a certain level L2 in a short period. 因而,在该情况下,在中断期间即使不中断光源的辉度控制,也应该对光源寿命丝毫没有产生任何深刻的影响。 Thus, in this case, without interruption of the light source luminance control, it should also did not have any profound influence on the life of the light source during the interruption. 但是, 若根据该假设例子,光源控制白白的被中断,在该期间不能防止黑影浮现等, However, if this assumption example, white light source control is interrupted during this period and the like can not prevent shadows emerge,

即不能改善显示质量。 That does not improve display quality. 而采用本实施形态,不进行这样的光源控制的白白的中断,仅在规定期间以上光源辉度以中间状态变化时,才中断光源的辉度控制。 The use of this embodiment, without performing such a white light source control interrupt, when the light source luminance variation period or the intermediate state before the interrupt source luminance control only in a predetermined. 因而,能够得到力图提高显示质量并且以所需要的最低限度进行光源辉度的控制中断的,超过单纯的折衷关系的效果。 Therefore, improvement of display quality can be obtained and the minimum required to control the brightness of the light source interrupted more than a simple trade-off relationship results. 第8实施形态图38所示为本发明第8实施形态的图象显示装置的构成。 The apparatus constituting an eighth embodiment of an image 38 shown in FIG eighth embodiment of the present invention. 另外,由于图38 所示的图象显示装置与图28所示的图象显示装置的不同点仅是中间控制信号生成单元36,信号变化控制单元37及系统控制单元44,因此对于其他构成的说明加以省略。 Further, since the image display shown in FIG. 38 and FIG. 28 apparatus differs from the image display apparatus is only an intermediate control signal generating unit 36, the control unit 37 changes the signal and a system control unit 44, and therefore other configuration It will not be described. 另外,在图38中,对于与图28相同的构成,附加相同的参照符号,并省略说明。 Further, in FIG. 38, FIG. 28 for the same configuration, the same reference numerals, and description thereof is omitted. 在本实施形态中,系统控制单元44控制上述各控制单元,特别是向中间控制信号生成单元36送出发光辉度控制静噪信号,向信号变化控制单元37送出初始值设定信号。 In the present embodiment, the system control unit 44 controls each of the control units, in particular to the intermediate control signal generating unit 36 ​​to send the starting luminance signal mute control, initial value setting signal sent to the signal control unit 37 changes. 中间控制信号生成单元36与前述的实施形态相同,根据设定的变换函数或变换表将输入的APL信号在每个单位场期间变换为作为控制光源6的发光辉度电平用的光源控制信号的基础的中间控制信号。 The intermediate control signal generating unit 36 ​​identical with the above-described embodiment, APL signal conversion function setting or the conversion table converts input during each field unit to control the light source as a light emission luminance level of 6 with a light source in accordance with a control signal a control signal on the basis of the intermediate. 中间控制信号这样控制,使得APL高时,增加光源6的发光辉度,APL低时,降低光源6的发光辉度。 The intermediate control signal is controlled such that the high APL, increasing the luminance of the light source 6, a low APL, reducing the luminance of the light source 6. 用中间控制信号生成单元36产生的中间控制信号,由于是由图象信号的APL的变化在每个单位场期间变化的信号。 Intermediate intermediate control signal generation unit 36 ​​generates a control signal, is a signal by a change due to the image signal APL variation during each field unit. 这里,在中间控制信号生成单元36 预先设定变化阈值电平APLmin,在单位场期间的APL变化小于变化阈值电平APLmin时,控制中间控制信号使其不变化。 Here, in the intermediate control signal generating unit 36 ​​changes the preset threshold level APLmin, APL unit period field variation is smaller than the variation threshold level APLmin, intermediate control signal so that the control does not change. 利用该处理,由于在图象信号的APL变化很微小时,进行控制使得光源6的发光辉度不进行变化,因此能够减少光源驱动条件的频繁变化,减轻因光源驱动条件的变化而引起的光源劣化。 With this process, since when the image signal APL variation is very small, control is performed so that the luminance of the light source 6 is not varied, it is possible to reduce the illumination source drive conditions change frequently, reducing the light source due to changes in driving conditions caused by deterioration. 另外,在中间控制信号生成单元36中,在输入图象信号切换时等图象信号处于不稳定的状态下,为了防止跟踪该不稳定的图象信号进行光源辉度控制, 由系统控制单元44输入发光辉度控制静噪信号。 Further, in the intermediate control signal generating unit 36, a state in which the input image signal in an unstable image signal switching, etc., in order to prevent the unstable tracking image signal source luminance control by the system control unit 44 emission luminance control input mute signal. 在该发光辉度控制静噪信号为on时,也控制中间控制信号使其不变化。 The emission luminance control signal muting is on, the control signal is also controlled so as not to change the intermediate. 信号变化控制单元37利用设定的时间常数,将每个单位场周期变化的中间控制信号变换为具有缓慢变换速度的光源控制信号。 The control unit 37 changes the signal using the set time constant, the change in the middle of each unit field period control signal to a light source control signal has a slow rate of transformation. 下面参照图39 (a)〜图39(c),详细说明利用信号变化控制单元的控制引起的光源6的发光状态的变化。 Light emission state changes using the light source control signal changes caused by the control unit 6 is described in detail below with reference to FIG. 39 (a) ~ FIG. 39 (c),. 图39 (a)所示为APL检测单元2输出的APL信号随时间变化的一个例子, 图39 (b)所示为输入图象信号切换时的发光辉度控制静噪信号随时间变化的一个例子,图39 (c)为利用根据图39 (a)及图39 (b)所示的APL信号及发光辉度控制静噪信号生成的光源控制信号驱动的光源6的发光辉度随时间的变化。 FIG 39 (a) is shown an example of the APL signal output from the APL detection unit changes with time, FIG. 39 (b) shown in FIG muting control signal when the luminance of the input image signal is switched to a change with time example, FIG. 39 (c) for the use of (a) and FIG. 39 (b) APL signal as shown in emission luminance and the light source control signal muting control signal generator 39 in accordance with FIG driving luminance of the light source 6 over time Variety. 现在考虑在从时刻tl至t2将输入图象信号从图象信号A切换为图象信号B 的情况。 Now consider the situation from the time tl to t2 the input image signal is switched from video signal A to video signal B in. 而且,根据图象信号切换前后的各图象信号得到的APL信号设为图39 (a)所示的信号。 Further, 39 (a) according to the APL signal each image signal before and after the image signal obtained by the switching signal is set as shown in FIG. 这时,供给中间控制信号生成单元36的发光辉度控制静噪信号如图39 (b)所示,利用系统控制单元44进行控制,使得从图象信号A 切换时的时刻tl起,到切换为图象信号B后各控制单元的动作稳定的时刻t3 为止,在这之间处于on状态。 In this case, the intermediate control signal generating unit supplying emission luminance control mute signal 36 in FIG. 39 (b), the system control unit 44 performs control such that the time tl from the time of switching from the image signal A, the handover When an image signal B is the operation of each control unit stable time point t3, which is between an on state. 在中间控制信号生成单元36中,由于在发光辉度控制静噪信号为on状态期间,控制中间控制信号使其不变化,因此结果光源控制信号也不变化,如图39 (c)所示,在时刻tl至时刻t3之间,光源发光辉度也不变化。 In the intermediate control signal generating unit 36, since the emission luminance control signal to an on state during the muting, the control so as not to change the intermediate control signal, so the result does not change the light source control signal, as shown in Figure 39 (c), in between time tl to time t3, light-emitting luminance does not change. 下面考虑在时刻t3发光辉度控制静噪信号为off状态,重新开始中间控制信号生成单元36的控制的状态。 Consider the timing t3 emission luminance mute control signal to an off state, the control state 36 re-starts the intermediate control signal generating unit. 例如,设图象信号A为如图39 (a)所示的图象信号,在时刻tl以前的状态是APL为较低的状态,切换后的图象信号B是以时刻t2以后的状态即APL为持续较高状态。 For example, assume video signal A is shown in FIG. 39 (a) in FIG image signal, at time tl the previous state is a state APL is low, the image signal B after the switching is after time t2 state i.e. APL is consistently high state. 在该情况下,如图39 (c)所示, 在图象信号A即将切换前,光源6的发光辉度为低状态,在发光辉度控制静噪信号为on状态的期间,维持发光辉度为低的状态。 During this case, FIG. 39 (c), in the previous picture signal A is about to switch, luminance of the light source 6 is low state, the emission luminance control signal on the muting state, emission luminance is maintained state to a low degree. 然后,在时刻t3发光辉度控制静噪信号为off状态,利用中间控制信号生成单元36的控制重新开始时, 若在信号变化控制单元37中照原样继续控制,则尽管图象信号B的APL为高的状态保持一定,信号变化控制单元37开始从紧靠时刻t3前的状态即光源辉度控制电率为低的状态起进行跟踪(图39 (c)的虚线的状态)。 Then, at time t3 emission luminance mute control signal to an off state by the intermediate control signal generating unit 36 ​​of the control is resumed, when the control unit 37 changes the signal continued as in the control, although the APL of an image signal B kept constant to a high state, the signal control unit 37 changes from the state before the time t3, i.e., against the light source luminance control from the low power state rate (state of FIG. 39 (c) of the broken line) trace. 因此,实际图象的APL状态与光源的发光辉度状态产生不一致,显示的图象具有不舒适感。 Thus, luminance of the light source and the state of the actual state of the APL of the inconsistent image, the image display having no sense of comfort. 因此,在本实施形态中,为了解决上述问题,另外引入由系统控制单元44 产生的初始值设定信号,在使发光辉度控制静噪信号为off时,同时将初始值设定信号送入信号变化控制单元37,将控制状态复位。 Accordingly, in the present embodiment, in order to solve the above problems, the introduction of additional initial value setting signal generated by the system control unit 44, when the luminance of the muting control signal is off, while the initial value setting signals into a signal control unit 37 changes the control state is reset. 通过这样,由于不管过去的控制经历如何,能够从进行复位时刻起重新开始控制,因此能够显示不产 By this way, the control regardless of past experience, be able to resume control from the reset time, and therefore can not produce display

生印图象信号切换时的光源发光辉度控制与显示图象不一致而引起的不舒适感的图象。 Uncomfortable feeling image of the source emission luminance control and the displayed image caused by disagreement when printed green image signal switching. 下面详细说明信号变化控制单元37。 The following detailed description of the control unit 37 changes the signal. 图40所示为信号变化控制单元37的构成。 Figure 40 is a control unit 37 composed of the signal change. 另外,由于图40所示的信号变化控制单元37与图30所示的信号变化控制单元32的不同点仅仅是另外包含选择器701这一点,因此对于其他相同的构成,附加相同的参照符号,并省略说明。 Further, since the signal variation shown in FIG 40 the control unit 37 and the signal variation shown in FIG. 30 differs from the control unit 32 further comprises selecting only 701 of this, and therefore the same for the other configuration, the same reference symbols, and omitted. 选择器701利用来自系统控制单元44的初始值控制信号进行控制。 The selector 701 is controlled with the initial value of the control signal from the system control unit 44. 选择器701根据该初始值控制信号,将应该反馈给加法器302、减法器303级比较器301的信号进行切换。 The selector 701 based on the initial value of the control signal, will be fed back to the adder 302, the subtractor 303 the signal comparator 301 is switched. 若更具体的进行说明,则通常将选择器307的输出供给上述各部分,而在图39 (c)所示时刻t3的时刻即图象信号的切换结束、信号稳定的时刻,接受来自系统控制单元44的初始值控制信号,这是将来自中间控制信号生成单元36的中间控制信号供给上述各部分。 If will be described more specifically, the output of the selector 307 is typically supplied to the respective portions in FIG. 39 (c), i.e. the time t3 as shown in the time switching the image signal ends, the timing signal is stable, the system control from accepting means an initial value of a control signal 44, which is from the middle of the intermediate control signal generating unit 36 ​​a control signal supplied to the respective portions. 在信号切换后,通过将中间控制信号照原样进行反馈,将光源控制信号的过去控制状态复位,能够将光源控制状态复位,能够将光源控制信号立刻调整为与现在图象信号的APL对应的电平。 After the switching signal, the intermediate control is performed by the feedback signal as is the light source control signal over the control state is reset, the reset state is possible to control the light source, the light source control signal can be immediately adjusted to the APL and the current image corresponding electrical signal level. 如上所述,根据第8实施形态,通过采用与APL的高级联动控制光源的发光辉度同样的构成,由于在电影软件那样的APL较低的黑暗场景中向光源的发光辉度降低的方向进行控制,因此能够改善画面的黑影浮现这样的黑暗场景中显示图象品位的问题,能够提供更高品位的图象。 As described above, according to the eighth embodiment, by using the APL control linkage advanced configuration similar luminance of the light source, since the direction of light emission luminance decrease at a lower APL of dark scenes of movie software such as control, it is possible to improve the picture emerges shadow dark scenes such display image quality problem, can provide a higher-quality image. 而且特别是通过利用初始值控制信号将光源控制信号复位,能够在输入图象信号切换时等情况下,在不想继续在这之前的控制状态时,能够以新的条件开始光源辉度的控制。 And in particular the light source control signal is a control signal is reset by using the initial value, it is possible to switch the input video signal and the like in the case, it is undesirable to continue a state before the control, the condition can be started with a new light source control luminance. 因此,能够避免光源辉度的控制状态与显示图象状态不一致的问题,能够显示与显示图象状态对应的没有不舒适感的图象。 Accordingly, it is possible to avoid inconsistencies control state and the display state of the image light source luminance problem, a display capable of displaying an image corresponding to the state of the image without uncomfortable feeling. 如上所述,本发明有关的图象显示装置及图象显示方法,是在由具有透射型线反射型的光调制作用的显示元件及对显示元件照射光的光源构成的图象显示装置中,改善因对比度感不足及黑影浮现的产生而引起的显示图象品位的降低,同时提高装置的可靠性。 As described above, the present invention is related to an image display apparatus and image display method, the display device is a display device having a reflection type optical modulation of a transmission line and an image irradiation light source element configured to display, improving the image quality due to the reduction in display contrast feeling is generated and the lack of shadows caused by emerging, while improving the reliability of the device.

Claims (6)

  1. 1. 一种图象显示装置,通过在透射型或反射型的具有光调制作用的显示元件上照射来自光源的光线以显示图象,包括:将输入图象信号的辉度电平分割为多个辉度电平区、并检测每个辉度电平区的直方图分布的直方图生成装置;以及对所述光源的光量进行控制的光量控制装置,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,所述光量控制装置控制所述光源的光量,使得照射在所述显示元件上的光量固定在规定的最小电平。 1. An image display apparatus, by irradiating light from a light source in the transmissive or reflective type display device having a light modulating function to display an image, comprising: the input image signal luminance level is divided into a plurality a luminance level region, the histogram generation means and detecting the luminance level of the histogram of each area distribution; and the amount of light of the light source light quantity control means controls, when the detected histogram generating means when the quantity of light of the plurality of luminance level region in at least one of the luminance level of the histogram distribution of the region is larger than a predetermined threshold value, the light quantity control means controls the light source so that the irradiation light amount on the display element fixed at a predetermined minimum level.
  2. 2. 如权利要求1所述的图象显示装置,其特征在于,还包括设置在所述光源与所述显示元件之间用于控制照射在所述显示元件上的光量的光圈,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,控制所述光源和光圈,使得照射在所述显示元件上的光量固定在规定的最小电平。 2. The image display device of claim 1, characterized by further comprising a light source disposed in the display with the light amount diaphragm on the display element between the element for controlling the irradiation, when the said plurality of luminance histogram generator means detecting a threshold level of at least a region level of the luminance histogram distribution is larger than a predetermined area, and control the light source and the aperture, such that the display element irradiated fixed amount of light in a predetermined minimum level.
  3. 3. 如权利要求1所述的图象显示装置,其特征在于,还包括设置在所述光源与所述显示元件之间用于控制照射在所述显示元件上的光量的调光元件,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,控制所述光源和调光元件,i使得照射在所述显示元件上的光量固定在规定的最小电平。 Image as claimed in claim 1, said display device, characterized in that, further comprising a light source and the display element for controlling the amount of light between the illumination on the dimming element in said display element, when when a histogram of the luminance level of at least the region of said plurality of histogram generating luminance level detection means in the region of the distribution is greater than a predetermined threshold value, controlling the light source and the dimming device, such that the irradiated I the minimum level of the amount of light on the element fixed to a predetermined display.
  4. 4. 一种图象显示装置,通过在透射型或反射型的具有光调制作用的显示元件上照射来自光源的光线以显示图象,包括:将输入图象信号的辉度电平分割为多个辉度电平区、并检测每个辉度电平区的直方图分布的直方图生成装置;以及设置在所述光源与所述显示元件之间用于控制照射在所述显示元件上的光量的光圈,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阈值时,控制所述光圈,使得照射在所述显示元件上的光量固定在规定的最小电平。 4. An image display apparatus, by irradiating light from a light source in the transmissive or reflective type display device having a light modulating function to display an image, comprising: the input image signal luminance level is divided into a plurality a luminance level region, the histogram generation means and detecting the luminance level of the histogram of each area distribution; and disposed between the light source for controlling the display element between the irradiation on the display element light amount diaphragm, when the luminance level of the plurality of regions of the histogram generator means detecting at least one of the luminance level of the histogram distribution area larger than a predetermined threshold value, the control aperture, such that irradiation the minimum level of the amount of light on the element fixed to a predetermined display.
  5. 5. —种图象显示装置,通过在透射型或反射型的具有光调制作用的显示元件上照射来自光源的光线以显示图象,包括:将输入图象信号的辉度电平分割为多个辉度电平区、并检测每个辉度电平区的直方图分布的直方图生成装置;以及设置在所述光源与所述显示元件之间用于调节照射在所述显示元件上的光量的调光元件,当所述直方图生成装置所检测的所述多个辉度电平区中的至少一个辉度电平区的直方图分布大于规定的阖值时,控制所述调光元件,使得照射在所述显示元件上的光量固定在规定的最小电平。 5. - kind of image display device, by irradiating light from a light source in the transmissive or reflective type display device having a light modulating function to display an image, comprising: the input image signal luminance level is divided into a plurality a luminance level region, the histogram generation means and detecting the luminance level of the histogram of each area distribution; and the light source disposed between the display element for adjusting the irradiation on the display element dimming light amount of element, when the luminance level of the plurality of regions of the histogram generator means detecting at least a brightness level of the area of ​​the whole family histogram distribution is greater than a predetermined value, controlling the dimming element, such that a predetermined amount of light irradiated on the fixed element of the minimum level in the display.
  6. 6. 如权利要求1至5中任一项所述的图象显示装置,其特征在于,所述多个辉度电平区中的所述至少一个辉度电平区是最接近黑色电平的区。 6. An image 1 to 5 according to any one of the display device of claim, wherein said plurality of said luminance level region in at least a luminance level region is closest to the black level the area.
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