CN114488674B - Projection optical system and offset adjustment method thereof - Google Patents
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Abstract
本发明提供一种投影光学系统及其偏色调整方法,该投影光学系统,包括:光源、光引导装置和光调制器,光引导装置将光源发出的出射光分成多路并分别引导至光调制器;第一光引导装置将出射光分成沿第一光路出射的红色基色光和沿第二光路出射的第二光;第二光引导装置将第二光分成沿第三光路出射的绿色基色光和沿第四光路出射的蓝色基色光;第一、第二和第三光调制器分别置于第一、第三和第四光路上,并对红色、绿色和蓝色基色光进行调制。本发明根据投影系统光源的光谱特性,使红色基色光首先从出射光中分离出来,解决了白场画面偏色的问题,使投影光学系统的颜色均匀性好。
The present invention provides a projection optical system and its color cast adjustment method. The projection optical system includes: a light source, a light guiding device and a light modulator. The light guiding device divides the outgoing light from the light source into multiple paths and guides them to the light modulator respectively. ; The first light guiding device divides the outgoing light into the red primary color light emitted along the first optical path and the second light emitted along the second optical path; the second light guiding device divides the second light into green primary color light emitted along the third optical path and The blue primary color light emitted along the fourth optical path; the first, second and third light modulators are placed on the first, third and fourth optical path respectively, and modulate the red, green and blue primary color light. According to the spectral characteristics of the light source of the projection system, the present invention separates the red primary color light from the outgoing light firstly, solves the problem of color cast in the white field picture, and makes the color uniformity of the projection optical system good.
Description
本申请是:申请号为201811018151.4、申请日2018年09月03日、名称为投影光学系统及其偏色调整方法的分案申请。This application is a divisional application with application number 201811018151.4, application date September 3, 2018, and titled projection optical system and its color cast adjustment method.
技术领域technical field
本发明涉及光学技术领域,特别是投影、照明技术领域,是一种颜色均匀性较好的投影光学系统及其偏色调整方法,尤其是一种投影光学系统及其偏色调整方法。The present invention relates to the field of optical technology, in particular to the field of projection and lighting technology, and relates to a projection optical system with better color uniformity and a color cast adjustment method thereof, in particular to a projection optical system and a color cast adjustment method thereof.
背景技术Background technique
在现有的投影光学系统中,光源发射出白色照明光,进入光机系统后被二向色片分成R、G、B三色光,三基色光分别照明在空间光调制器上,经过合光装置及镜头后得到一幅图像。In the existing projection optical system, the light source emits white illumination light, which is divided into R, G, and B three-color light by the dichroic film after entering the optical-mechanical system. An image is obtained after the device and the lens.
由于二向色片能够反射一定波长的光,透射另一波长的光,从而将不同波长的光分开。现有技术中一般通过镀膜的方式使二向色片具有分光的能力。由于镀膜的特性,当光束的入射角度不同时,二向色片对于光束的透/反射光谱特性也会改变,通常的规律是,光束入射角变大,二向色片的透/反射谱线会向短波方向漂移。Because the dichroic film can reflect light of a certain wavelength and transmit light of another wavelength, it can separate the light of different wavelengths. In the prior art, the dichroic film is generally provided with light-splitting ability by means of coating. Due to the characteristics of the coating, when the incident angle of the beam is different, the transmission/reflection spectral characteristics of the dichroic film for the beam will also change. Will drift to the shortwave direction.
通常情况下,在光路中,物面发出的光束的主光轴是平行入射到像面上时,称为远心光路;如果不是平行入射到像面则称为非远心光路。在投影光学系统中,当二向色片被置于非远心的照明光路中时,会由于不同区域光束入射角不同引起不同区域透/反射光谱存在差异,当光源光谱较宽时,二向色片不同区域透/反射的光的光谱成分会不同,从而导致画面两侧的颜色不一致。比如:如果以一种典型的三片LCD的投影系统为例,当投影白场画面时,画面会出现左侧偏青,右侧偏红的问题。Usually, in the optical path, when the main optical axis of the light beam emitted by the object plane is incident on the image plane in parallel, it is called a telecentric optical path; if it is not incident in parallel to the image surface, it is called a non-telecentric optical path. In the projection optical system, when the dichroic film is placed in the non-telecentric illumination light path, there will be differences in the transmission/reflection spectra of different areas due to the different beam incident angles in different areas. When the light source spectrum is wide, the dichroic The spectral components of the transmitted/reflected light in different areas of the color chip will be different, resulting in inconsistent colors on both sides of the screen. For example, if we take a typical three-chip LCD projection system as an example, when projecting a white field image, the left side of the screen will appear blue, and the right side will appear reddish.
现有的投影光源主要可分为氙灯、UHP灯(超高压汞灯泡)等灯泡光源、LED光源、纯激光光源以及激光荧光光源。图1至图4分别为现有灯泡光源1000、LED光源、纯激光光源和激光荧光光源9000的发光光谱图,它们各自的发光光谱如图1至图4所示。需要说明的是,如图3所示,其中,无论是蓝色激光光源6000、绿色激光光源7000,还是红色激光光源8000,由于纯激光光源的光谱很窄,并不在本发明所要解决的问题讨论之中。如图1所示的灯泡光源1000、如图2所示的蓝色LED光源2000、绿色LED光源3000、红色LED光源4000和转换后的绿色LED光源5000,以及如图4所示的激光荧光光源9000,由于它们的发光光谱较宽,在二向色片透/反射率变化的光谱位置存在光谱分量,故而应用于本发明所述的投影光学系统中时,会产生难以避免的画面偏色问题。Existing projection light sources can be mainly divided into bulb light sources such as xenon lamps, UHP lamps (ultra-high pressure mercury bulbs), LED light sources, pure laser light sources and laser fluorescent light sources. Fig. 1 to Fig. 4 are the luminescence spectrum diagrams of the existing light
在投影系统实际的使用中,偏色的问题在播放视频的过程中,通常没有可觉察的影响,但对于办公、教学等以白色画面为主的使用场景,该问题尤为明显。In the actual use of the projection system, the problem of color cast is usually not noticeable in the process of playing video, but it is especially obvious for office, teaching and other usage scenarios where white screens are the mainstay.
通常情况下,在这种光学系统的设计中,会通过对二向色片进行梯度镀膜的方式来对该问题进行修正,即:对二向色片的不同区域镀不同特性的膜,以此来修正因入射角不同所造成的影响。在实际的生产中,由于公差的影响,这种梯度镀膜往往难以精准地对入射角不同所造成的偏色进行补偿,因此,这种类型的投影系统无法避免有轻微的偏色问题。同时,这种梯度镀膜的二向色片也会带来成本的提升,其变化梯度越准确,成本就会越高。Usually, in the design of this kind of optical system, this problem will be corrected by gradient coating on the dichroic plate, that is, different regions of the dichroic plate are coated with films with different characteristics, so as to To correct the influence caused by different incident angles. In actual production, due to the influence of tolerances, it is often difficult for this gradient coating to accurately compensate for the color cast caused by different incident angles. Therefore, this type of projection system cannot avoid slight color cast problems. At the same time, this kind of dichroic film with gradient coating will also increase the cost. The more accurate the change gradient is, the higher the cost will be.
发明内容Contents of the invention
本发明所要解决的技术问题在于针对现有技术的不足,提供一种投影光学系统及其偏色调整方法,本发明根据投影系统光源的光谱特性,使红色基色光首先从出射光中分离出来,解决了白场画面偏色的问题,使投影光学系统的颜色均匀性好。The technical problem to be solved by the present invention is to provide a projection optical system and its color cast adjustment method in view of the deficiencies of the prior art. According to the spectral characteristics of the light source of the projection system, the present invention separates the red primary color light from the outgoing light first, The problem of color cast in the white field picture is solved, and the color uniformity of the projection optical system is improved.
本发明所要解决的技术问题是通过如下技术方案实现的:The technical problem to be solved by the present invention is achieved through the following technical solutions:
一种投影光学系统,包括:光源、光引导装置、光调制器,A projection optical system, comprising: a light source, a light guiding device, a light modulator,
所述光源用于发出至少包括三基色的出射光;The light source is used to emit light that includes at least three primary colors;
所述光引导装置将出射光分成多路并分别引导至所述光调制器;The light guiding device divides the outgoing light into multiple paths and guides them to the light modulators respectively;
所述光引导装置包括第一光引导装置和第二光引导装置,所述光调制器包括第一光调制器、第二光调制器和第三光调制器;The light guide includes a first light guide and a second light guide, and the light modulator includes a first light modulator, a second light modulator, and a third light modulator;
所述第一光引导装置将所述出射光分成沿第一光路出射的红色基色光和沿第二光路出射的第二光,所述第二光为所述出射光中除去红色基色光的其它基色光;The first light guiding device divides the emitted light into red primary color light emitted along the first optical path and second light emitted along the second optical path, and the second light is other light except the red primary color light in the emitted light Primary color light;
所述第二光引导装置将所述第二光分成沿第三光路出射的绿色基色光和沿第四光路出射的蓝色基色光;The second light guiding device divides the second light into green primary color light emitted along the third optical path and blue primary color light emitted along the fourth optical path;
所述第一光调制器置于所述第一光路上,对红色基色光进行调制;The first light modulator is placed on the first optical path to modulate the red primary color light;
所述第二光调制器置于所述第三光路上,对绿色基色光进行调制;The second light modulator is placed on the third light path to modulate the green primary color light;
所述第三光调制器置于所述第四光路上,对蓝色基色光进行调制。The third light modulator is placed on the fourth light path to modulate the blue primary color light.
本发明还提供一种投影光学系统的偏色调整方法,包括如下步骤:The present invention also provides a method for adjusting color cast of a projection optical system, comprising the following steps:
步骤100:使光源发出的至少包括三基色的出射光在光引导装置的作用下依次分成沿不同光路出射的红色基色光、绿色基色光和蓝色基色光;Step 100: make the outgoing light from the light source including at least three primary colors be sequentially divided into red primary color light, green primary color light and blue primary color light emitted along different optical paths under the action of the light guiding device;
步骤200:所述红色、绿色和蓝色基色光分别在第一、第二和第三光调制器的调制后,再通过合光棱镜进行汇聚出射,其中,在进入光调制器之前,所述蓝色基色光所经过的光路最长。Step 200: The red, green, and blue primary color lights are respectively modulated by the first, second, and third light modulators, and then converged and emitted by a light-combining prism, wherein, before entering the light modulator, the The light path traveled by the blue primary color light is the longest.
综上所述,本发明提供一种投影光学系统及其偏色调整方法,本发明根据投影系统光源的光谱特性,在包括三基色的出射光经过第一光引导装置时,使红色基色光最先从出射光中分离出来,且在三基色光进入光调制器之前,蓝色基色光经过的光路最长,从而使红色基色画面与绿色基色画面的方向是一致的,解决了白场画面偏色的问题,使投影光学系统的颜色均匀性好;在对蓝色图像帧进行调制时,通过对蓝色基色光补充绿色基色光,改善蓝色显示画面的颜色,以获得更好的显示效果。In summary, the present invention provides a projection optical system and its color cast adjustment method. According to the spectral characteristics of the light source of the projection system, when the outgoing light including the three primary colors passes through the first light guiding device, the red primary color light It is separated from the outgoing light first, and before the three primary color lights enter the light modulator, the light path of the blue primary color light is the longest, so that the directions of the red primary color picture and the green primary color picture are consistent, and the white field picture is solved. The color uniformity of the projection optical system is good; when the blue image frame is modulated, the blue primary color light is supplemented by the green primary color light to improve the color of the blue display screen to obtain a better display effect .
下面结合附图和具体实施例,对本发明的技术方案进行详细地说明。The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
附图说明Description of drawings
图1为现有灯泡光源的发光光谱图;Fig. 1 is the luminescence spectrum diagram of existing light bulb light source;
图2为现有LED光源的发光光谱图;Fig. 2 is the luminescence spectrum diagram of existing LED light source;
图3为现有纯激光光源的发光光谱图;Fig. 3 is the luminescence spectrum diagram of existing pure laser light source;
图4为现有激光荧光光源的发光光谱图;Fig. 4 is the luminescence spectrum diagram of existing laser fluorescent light source;
图5为本发明投影光学系统的示意图;5 is a schematic diagram of the projection optical system of the present invention;
图6为图5系统的发光光源光谱与投射谱线图。FIG. 6 is a diagram of the light source spectrum and projected spectrum of the system in FIG. 5 .
附图标记说明Explanation of reference signs
201正透镜 202第一二向色片 203第二二向色片 204第一中继透镜 205反射镜206第二中继透镜 207场镜 208空间光调制器 209合光棱镜201
1000灯泡光源 2000蓝色LED光源 3000绿色LED光源 4000红色LED光源 5000转换后的绿色LED光源 6000蓝色激光光源 7000绿色激光光源 8000红色激光光源 9000激光荧光光源1000 Bulb Light Source 2000 Blue
具体实施方式Detailed ways
总体来说,本发明提供一种投影光学系统,包括:光源、光引导装置、光调制器,其中的光源用于发出至少包括红色、绿色和蓝色三基色的出射光;所述光引导装置将所述出射光分成多路并分别引导至所述光调制器;所述光引导装置包括第一光引导装置和第二光引导装置,所述光调制器包括第一光调制器、第二光调制器和第三光调制器。具体来说,所述第一光引导装置将所述出射光分成沿第一光路出射的红色基色光和沿第二光路出射的第二光,所述第二光为所述出射光中除去红色基色光的其它基色光;所述第二光引导装置将所述第二光分成沿第三光路出射的绿色基色光和沿第四光路出射的蓝色基色光;所述第一光调制器置于所述第一光路上,对所述红色基色光进行调制;所述第二光调制器置于所述第三光路上,对所述绿色基色光进行调制;所述第三光调制器置于所述第四光路上,对所述蓝色基色光进行调制。In general, the present invention provides a projection optical system, including: a light source, a light guiding device, and a light modulator, wherein the light source is used to emit at least three primary colors of red, green and blue outgoing light; the light guiding device The outgoing light is divided into multiple paths and guided to the light modulator respectively; the light guiding device includes a first light guiding device and a second light guiding device, and the light modulator includes a first light modulator, a second light guiding device light modulator and a third light modulator. Specifically, the first light guiding device divides the emitted light into red primary light emitted along the first optical path and second light emitted along the second optical path, and the second light is the red color removed from the emitted light. the other primary color light of the primary color light; the second light guiding device divides the second light into the green primary color light emitted along the third optical path and the blue primary color light emitted along the fourth optical path; the first light modulator sets On the first light path, the red primary color light is modulated; the second light modulator is placed on the third light path, and the green primary color light is modulated; the third light modulator is placed on the On the fourth optical path, the blue primary color light is modulated.
为了确保红色、绿色和蓝色基色光分别进入对应的光调制器,且使各基色光所经过的光路较优,所述投影光学系统还包括有至少两个反射组件,分别为第一反射组件和第二反射组件,每个反射组件可以包括一个、两个、三个、或多个反射镜;所述第一反射组件设置于所述第一光路上,用于将所述红色基色光进行反射以使其进入所述第一光调制器;所述第二反射组件置于所述第四光路上,用于将所述蓝色基色光进行反射以使其进入所述第三光调制器。In order to ensure that the primary color lights of red, green and blue respectively enter the corresponding light modulators, and make the light path passed by each primary color light better, the projection optical system also includes at least two reflective components, which are respectively the first reflective component and a second reflective assembly, each reflective assembly may include one, two, three, or a plurality of reflective mirrors; the first reflective assembly is arranged on the first optical path for performing the red primary color light reflect so that it enters the first light modulator; the second reflective assembly is placed on the fourth optical path for reflecting the blue primary color light so that it enters the third light modulator .
更具体地,所述第一光引导装置包括第一二向色片,所述第二光引导装置包括第二二向色片。More specifically, said first light guiding means comprises a first dichroic plate and said second light guiding means comprises a second dichroic plate.
为了达到更好的显示效果,所述第二二向色片的滤波截止范围为465-495nm范围段,也就是说第二二向色片的分色波长范围为465-495nm。请结合图6,T2为第二二向色片的透射谱线,小于465nm波长范围的光可以全部从第二二向色片透过,大于495nm波长范围的光全部被第二二向色片反射。优选的,第二二向色片的分色波长范围为475-485nm。In order to achieve a better display effect, the filter cut-off range of the second dichroic film is in the range of 465-495 nm, that is to say, the color separation wavelength range of the second dichroic film is 465-495 nm. Please combine with Figure 6, T2 is the transmission line of the second dichroic film, all light in the wavelength range of less than 465nm can pass through the second dichroic film, and all light in the wavelength range of greater than 495nm is transmitted by the second dichroic film reflection. Preferably, the dichroic wavelength range of the second dichroic plate is 475-485nm.
实施例一Embodiment one
图5为本发明投影光学系统的示意图。如图5所示,结合具体的实施例,对本发明的技术方案进行详细地说明。在本实施例中,提供一种投影光学系统,包括,光源、二向色片、反射镜、光调制器和合光棱镜209。其中的二向色片属于上文中所述的光引导装置的一种,在实际应用中,除了使用二向色片作为光引导装置之外,还可以使用包括滤光片、区域膜片等在内的其他光学元器件来实现对光线的引导。在图5所示的实施例中,二向色片包括了第一二向色片202和第二二向色片203。为了确保分出的红色、绿色和蓝色基色光分别进入对应的光调制器,所述投影光学系统还包括有多个反射组件,具体为:图5中的反射镜205。由于需要对不同颜色的基色光调制,因此,所述的光调制器也包括了第一光调制器208、第二光调制器208’和第三光调制器208”,分别对应设置在不同颜色基色光的光路上。另外,为了达到更好的显示效果,除了上述主要的元器件之外,在投影光学系统中还包括有设置在光源和光引导装置之间的正透镜201,用于对光源的出射光束进行汇聚;还包括设置在光调制器之前的场镜207,用于对光束进行调整等。FIG. 5 is a schematic diagram of the projection optical system of the present invention. As shown in FIG. 5 , the technical solution of the present invention is described in detail in combination with specific embodiments. In this embodiment, a projection optical system is provided, including a light source, a dichroic plate, a reflector, a light modulator, and a
如图5所示,在本发明所提供的投影光学系统中,光线的光路和对偏色的调整过程是通过如下的方式和过程实现的:As shown in Figure 5, in the projection optical system provided by the present invention, the optical path of the light and the adjustment process to the color cast are realized through the following methods and processes:
光源发出的至少包括红色、绿色和蓝色三基色在内的出射光,经过第一二向色片202,将所述出射光分成沿第一光路出射的红色基色光和沿第二光路出射的第二光。其中的第一光路是指图5中从第一二向色片202分出的竖直方向上的光路,而第二光路则是指图5中的水平方向上的光路。此时,经过第一二向色片202沿第二光路出射的第二光包括了所述出射光中除去红色基色光的其它基色光。第二二向色片203将所述第二光分成沿第三光路出射的绿色基色光和沿第四光路出射的蓝色基色光。其中的第三光路是指图5中从第二二向色片203分出的竖直方向上的光路,而第四光路则是指图5中的水平方向上的光路。而光调制器也包括了第一光调制器208、第二光调制器208’和第三光调制器208”,分别对应设置在不同颜色基色光的光路上。具体来说,所述第一光调制器208置于所述第一光路上,对所述红色基色光进行调制;所述第二光调制器208’置于所述第三光路上,对所述绿色基色光进行调制;所述第三光调制器208”置于所述第四光路上,对所述蓝色基色光进行调制。在进入光调制器之前,所述蓝色基色光所经过的光路最长。The outgoing light emitted by the light source, including at least the three primary colors of red, green and blue, passes through the first
更进一步地,为了确保红色、绿色和蓝色基色光分别进入对应的光调制器,所述投影光学系统还包括有多个反射组件,即:图5中所示的反射镜205。在整个投影光学系统中,一个反射镜205设置于所述第一光路上,用于将所述红色基色光进行反射以使其进入所述第一光调制器208;另外两个反射镜205分别置于所述第四光路上的不同位置,用于将所述蓝色基色光进行反射以使其进入所述第三光调制器208”。Furthermore, in order to ensure that the primary color lights of red, green and blue respectively enter the corresponding light modulators, the projection optical system further includes a plurality of reflective components, that is,
也就是说,光源发出的出射光,经过两个二向色片分解为三色照明光后,分别经反射镜205和不同的光调制器后,在合光棱镜209中进行合光,按照光路的传输顺序,第一二向色片202反射蓝色基色光且透射绿色基色光和红色基色光,所述第二二向色片203反射绿色基色光且透射红色基色光。为了对光源出射的光束进行汇聚,所述光源和第一二向色片202之间设有正透镜201。进一步地,为了通过形成中间像来缩短光程,所述第二二向色片203中透射出的蓝色基色光,顺序经过第一中继透镜204和第二中继透镜206后,通过呈一次中间像,使蓝色基色光光路在空间光调制器上成的像与红、绿色基色光是左右颠倒的。红色基色光和蓝色基色光再经反射镜205进入光调制器208,光调制器208可以是LCD、LCOS或是DMD。更进一步地,为了对光束进行调整,所述光调制器208的光线入射前端设有场镜207。That is to say, after the outgoing light from the light source is decomposed into three-color illumination light by two dichroic plates, after passing through the
由上述内容可知,在本发明所提供的投影光学系统中,通常利用两片二向色片将光源发出的出射光分成R(红)、G(绿)、B(蓝)三色基色光,然而,当二向色片被置于非远心光路中时,会导致最终的投影画面两侧会有偏色的问题,特别在全白色画面,即:白场,偏色尤为明显。It can be seen from the above that in the projection optical system provided by the present invention, two dichroic plates are usually used to divide the outgoing light from the light source into three primary colors of R (red), G (green), and B (blue), However, when the dichroic film is placed in the non-telecentric light path, it will cause the problem of color cast on both sides of the final projected picture, especially in the all-white picture, that is: white field, the color cast is particularly obvious.
当红色、绿色和蓝色基色光在空间光调制器上成的像是同一方向时,即使二向色片没有补偿入射光角度带来的偏色问题,也只会导致红、绿、蓝场各自的偏色,当投影白场画面时,由于红、绿、蓝色基色光光谱的叠加,并不会有偏色。但由于红色基色光光路的成像是反过来的,偏色问题在白场画面被叠加放大了,所以二向色片只要有少量的偏移没有补偿,也会在白场画面造成可觉察的偏色问题。When the red, green, and blue primary colors are imaged in the same direction on the spatial light modulator, even if the dichroic film does not compensate for the color cast caused by the angle of the incident light, it will only cause red, green, and blue fields. For their own color cast, when projecting a white field picture, there will be no color cast due to the superimposition of the red, green, and blue primary color light spectra. However, since the imaging of the red primary color light path is reversed, the color cast problem is superimposed and magnified in the white scene, so as long as there is a small amount of offset in the dichroic film without compensation, it will also cause a noticeable cast in the white scene. color problem.
需要说明的是,如上所述的“红色基色光光路的成像是反过来的”,具体指的是:在成像光路中,物面左侧的一个点,经过蓝色基色光光路、绿色基色光光路后,成像到了像面(可以理解为实际的投影画面)的左侧,而它经过红色基色光光路后,成像到了像面的右侧,此时,红色基色光的成像相对于蓝色基色光、绿色基色光是反过来的。在本实施例中,并不强调正像和反像的概念,但是强调红色基色光跟蓝色基色光、绿色基色光的差异,因为这种差异导致了画面颜色不均匀的问题。现有技术中,红色基色光之所以会反过来,是因为红色基色光在最后才被分离出来时所经过的光路比较长,且在光路上需要通过第一中继透镜204、第二中继透镜206和场镜207多成像一次,导致它跟蓝色基色光、绿色基色光的方向相反。It should be noted that the "imaging of the red primary color light path is reversed" as mentioned above specifically refers to: in the imaging light path, a point on the left side of the object plane passes through the blue primary color light optical path, the green primary color light After the optical path, it is imaged to the left side of the image plane (which can be understood as the actual projection screen), and after passing through the red primary color light path, it is imaged to the right side of the image plane. At this time, the imaging of the red primary color light is relative to the blue primary color Light and green primary color light are reversed. In this embodiment, the concept of positive image and reverse image is not emphasized, but the difference between red primary color light, blue primary color light, and green primary color light is emphasized, because this difference leads to the problem of uneven color of the picture. In the prior art, the reason why the red primary color light is reversed is because the light path of the red primary color light is relatively long when it is finally separated, and it needs to pass through the
本发明中,出射光在入射到第一二向色片202时,首先将红色基色光分离出来,可以缩短红色基色光的光路,且不需要经过中继透镜的多次成像,不会造成红色基色光的成像反过来的问题。本发明经过调整,使蓝色基色光的光路最长,且所成的像相对于红色基色光和绿色基色光的成像的方向是相反的,但这并不会引起偏色问题。如图6所示,具体原因在于,由于激光荧光光源的光谱特性,蓝色激光光源6000与激光荧光光源9000的波长在光谱上有20-30nm的间隔,而本发明巧妙地将第二二向色片的分色波长设置在这个间隔之内,即使由于入射光的角度差异引起光谱透射谱线的偏移,由于光源在这个间隔之内没有光谱成分,并不会在投影画面上产生偏色的问题。具体地,第二二向色片分色波长的值可以设置在465nm-495nm,优选设置在475nm-485nm。In the present invention, when the outgoing light is incident on the first
本发明所提供的投影光学系统通过将红色基色光最先从出射光中分离出来,且在三基色光进入光调制器之前,蓝色基色光经过的光路最长,也就是说将红、蓝色基色光的光路进行了调换,从而使红色基色画面与绿色基色画面的方向是一致的,可以从原理上抑制白场画面偏色问题的产生。单色画面的偏色仍然需要通过梯度镀膜的二向色片来进行补偿,但是消除了白场的偏色问题,在观看过程中的体验会好很多,同时,对于镀膜梯度的准确度要求也相应的放宽了,可以减少成本。The projection optical system provided by the present invention first separates the red primary color light from the outgoing light, and before the three primary color lights enter the light modulator, the blue primary color light has the longest optical path, that is to say, the red and blue The optical path of the color base color light is exchanged, so that the directions of the red base color picture and the green base color picture are consistent, which can suppress the color cast problem of the white field picture in principle. The color cast of the monochrome picture still needs to be compensated by the dichroic film with gradient coating, but the problem of color cast in the white field is eliminated, and the viewing experience will be much better. At the same time, the accuracy requirements for the coating gradient are also required. Corresponding relaxation can reduce costs.
实施例二Embodiment two
在上述实施例一的基础上,将红、蓝色基色光路调换,并将二向色片的分色波长设置在蓝激光与荧光光谱的间隔中后,可能会带来的一个问题是,投影画面的B(蓝色)基色光全部是蓝激光。一般的,蓝激光的可选波长在445nm-465nm之间,选择波长短的蓝激光,更有利于本发明所要解决的问题,因为蓝激光和荧光在光谱上的间隔更宽;但通常认为465nm的蓝色基色光颜色会更好。On the basis of the first embodiment above, after the red and blue primary color optical paths are exchanged, and the color separation wavelength of the dichroic plate is set in the interval between the blue laser and the fluorescent spectrum, a problem that may be caused is that the projection The B (blue) primary color light on the screen is all blue laser light. Generally, the selectable wavelength of blue laser is between 445nm-465nm, selects the blue laser of short wavelength, is more conducive to the problem to be solved by the present invention, because blue laser and fluorescence are wider on the spectrum interval; But it is generally considered that 465nm The blue base color light color will be better.
为了使蓝色画面的显示效果更好,需要在对蓝色图像帧进行调制时,在蓝色基色光的基础上增加少量绿色基色光。少量的绿色基色光的加入可以通过控制装置进行控制。具体地,在对蓝色图像帧进行调制时,控制装置控制蓝色基色光进入所述第三光调制器208”进行调制,同时控制部分绿色基色光进入所述第二光调制器进行调制208’,也就是说,蓝色图像帧所显示的图画是由第三光调制器对蓝色基色光进行调制和第二光调制器对少量绿色基色光进行调制的叠加。在对蓝色图像进行调制时,要求蓝色基色光的灰阶值大于部分绿色基色光的灰阶值,在第二光调制器对光进行调制时,控制装置根据蓝色基色光的调制信号控制所述部分绿色基色光的量。In order to make the display effect of the blue picture better, it is necessary to add a small amount of green primary color light to the blue primary color light when modulating the blue image frame. The addition of a small amount of green primary color light can be controlled by the control device. Specifically, when modulating a blue image frame, the control device controls the blue primary color light to enter the third
在选择短波长蓝激光的基础上,可以通过信号处理的方式来对B基色光的颜色进行弥补。例如,对于给定的一个RGB(0,0,255)的蓝场信号,可以通过处理更改为RGB(0,1,255)的一个信号,加入少量的绿色基色光,来改善蓝场的颜色。On the basis of selecting a short-wavelength blue laser, the color of the B primary color light can be compensated by means of signal processing. For example, given a blue field signal of RGB (0, 0, 255), the color of the blue field can be improved by processing a signal changed to RGB (0, 1, 255) and adding a small amount of green primary color light .
因此,本实施例与实施例一的不同之处在于,投影光学系统还包括补充光源,所述补充光源用于发出绿色基色光。在对蓝色图像帧进行调制时,加入的少量绿色基色光可以由补充光源提供。Therefore, the difference between this embodiment and Embodiment 1 is that the projection optical system further includes a supplementary light source for emitting green primary color light. When modulating the blue image frame, the added small amount of green primary color light can be provided by the supplementary light source.
具体来说,补充G(绿色基色光)信号的大小与B(蓝色基色光)信号的大小有关,原则上以蓝色基色光+补充的少量绿色基色光得到一个颜色(色坐标)较好的B光为准,该色坐标可参考DCI、Rec.709等色域。当B信号比较小的时候,需要的绿色基色光会小于1个灰阶的绿色基色光,导致无法补充绿色基色光,但是此时B(蓝色基色光)光亮度较低,人眼对其颜色并不太敏感;B(蓝色基色光)信号较大时,可以通过该方案在蓝色基色光中补充一定的绿色达到整体的B基色光较好的颜色。Specifically, the supplementary G (green primary color light) signal is related to the B (blue primary color light) signal. In principle, it is better to obtain a color (color coordinate) with blue primary color light + a small amount of supplementary green primary color light The B light shall prevail, and the color coordinates may refer to DCI, Rec.709 and other color gamuts. When the B signal is relatively small, the required green primary color light will be less than the green primary color light of 1 gray scale, resulting in the inability to supplement the green primary color light. The color is not very sensitive; when the B (blue primary color light) signal is large, this scheme can be used to add a certain amount of green to the blue primary color light to achieve a better color for the overall B primary color light.
对于补充绿色基色光来改善蓝色基色光颜色的实施例,所需要的蓝色基色光和绿色基色光的灰阶的比值是需要满足一个范围,在这个范围里,认为蓝色的颜色得到了改善;超出这个范围要么就偏绿,要么就偏蓝;一个可选的比值范围是100-255。那么当B(蓝色基色光)信号比较小,比如:10个灰阶时,需要增加至少是1个灰阶的绿色基色光,这个时候,蓝/绿的比值就小了,混出来的颜色会偏绿。For the embodiment in which the green primary color light is supplemented to improve the color of the blue primary color light, the grayscale ratio of the required blue primary color light to the green primary color light needs to satisfy a range. In this range, the blue color is considered to be obtained. Improvement; beyond this range it is either greenish or bluish; an optional ratio range is 100-255. Then when the B (blue primary color light) signal is relatively small, for example: when there are 10 gray levels, it is necessary to add at least 1 gray level green primary color light. At this time, the ratio of blue/green is small, and the mixed color Will be greenish.
由于补充光源的增加,在对绿色图像帧进行调制时,控制装置可以控制所述光源发出的所述绿色基色光以及所述补充光源发出的绿色基色光进入所述第二光调制器进行调制。从而可以扩大图像的显示色域。Due to the addition of supplementary light sources, when modulating a green image frame, the control device may control the green primary light emitted by the light source and the green primary light emitted by the supplementary light source to enter the second light modulator for modulation. Thereby, the display color gamut of the image can be expanded.
综上所述,本发明提供一种投影光学系统及其偏色调整方法,根据投影系统光源的光谱特性,调换红色光路和蓝色光路的位置,解决了白场画面偏色的问题,使投影光学系统的颜色均匀性好;并通过对蓝色基色光补充绿色基色光,改善蓝场的颜色,以获得更好的显示效果。To sum up, the present invention provides a projection optical system and its color cast adjustment method. According to the spectral characteristics of the light source of the projection system, the positions of the red light path and the blue light path are exchanged, which solves the problem of color cast in the white field picture and makes the projection The color uniformity of the optical system is good; and by supplementing the green primary color light to the blue primary color light, the color of the blue field is improved to obtain a better display effect.
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