WO2019075992A1 - 一种提高投影亮度的混色发光方法及投影装置 - Google Patents

一种提高投影亮度的混色发光方法及投影装置 Download PDF

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WO2019075992A1
WO2019075992A1 PCT/CN2018/080926 CN2018080926W WO2019075992A1 WO 2019075992 A1 WO2019075992 A1 WO 2019075992A1 CN 2018080926 W CN2018080926 W CN 2018080926W WO 2019075992 A1 WO2019075992 A1 WO 2019075992A1
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Prior art keywords
light source
led light
excitation
led
blue
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PCT/CN2018/080926
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English (en)
French (fr)
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杨伟樑
高志强
杨承德
张新勇
郭胜男
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广景视睿科技（深圳）有限公司
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources

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  • the embodiments of the present application relate to the field of optical technologies, and in particular, to a color mixing and lighting method and a projection apparatus for improving projection brightness.
  • Brightness is critical to the quality of the projection of the microprojector, and products with higher brightness will have a better display under the influence of the same ambient light.
  • mainstream micro-injection products on the market use DLP technology and LED light source.
  • the brightness is generally not up to the level of traditional projectors.
  • Portable micro-injection is generally between 200ANSI-500ANSI, and household-type micro-injection is generally between 500ANSI-1000ANSI.
  • the measured brightness of micro-projectors of many LED light sources is generally not bright. Short board.
  • the LED light source currently used has a relatively low luminous efficiency in green, so the brightness of the overall RGB LED light source is not high, although the industry has also introduced an HLD light source, which can break through the level of 1000 ANSI brightness, but the brightness needs to be greater.
  • the space of the product will increase and it cannot be used on a small-volume micro projector.
  • the technical problem to be solved by the embodiments of the present application is to provide a mixed color light emitting method and a projection device for improving projection brightness.
  • the brightness of the micro projector can be improved, and the color gamut and power are less affected.
  • a technical solution adopted by the embodiment of the present application is to provide a mixed color illumination method for improving projection brightness, which is applied to a projection device, the projection device includes an LED light source and a dichroic lens, and the LED light source includes a red LED light source.
  • the green LED light source, the blue LED light source, and the excitation LED light source, the pulse timings of the red LED light source, the green LED light source, and the blue LED light source are time-divisionally generated, and the method includes:
  • the driving signal of the preset excitation LED light source is identical to the driving signal of any one of the red LED light source, the green LED light source, and the blue LED light source, and the LED light source that matches the driving signal with the driving signal of the excitation LED light source is defined as the designated LED light source;
  • the LED light source for excitation When the designated LED light source is lit, the LED light source for excitation is also illuminated at the same time, and the remaining LED light sources are turned off, and the light emitted by the excitation LED light source is irradiated on the extinguished LED light source through the dichroic lens, and the LED light source that is excited and extinguished is emitted accordingly.
  • the light of the color, the light emitted by the extinguished LED light source is mixed with the light emitted by the designated LED light source and projected.
  • the excitation LED light source is located opposite the LED light source that is inconsistent with the driving signal thereof, and the dichroic lens is configured to transmit the light emitted by the excitation LED light source and the light emitted by the LED light source after the reflection is extinguished; or
  • the excitation LED light source is located on the side of the LED light source that is inconsistent with its drive signal, and the dichroic lens is used to reflect the light emitted by the excitation LED light source and the light emitted by the LED light source that is extinguished by the transmission.
  • the driver of the LED light source includes an LED driver supporting three-way time-division lighting and an independent one-way LED driver, and supports three-way time-division LED driver respectively with red LED light source, green LED light source and blue The LED light source is connected, and the independent one-way LED driver is connected to the excitation LED light source; or
  • the LED light source driver includes four independent one-way LED drivers, and one independent one-way LED driver is connected to one LED light source.
  • the light emitted by the LED light source is excited, the brightness of which is controlled by the current pulses of its drive signal.
  • the brightness of the mixed light increases as the current pulse increases, and the color gamut of the mixed light decreases as the current pulse increases.
  • the percentage of current for exciting the LED light source is between 10% and 30%.
  • the embodiment of the present application further provides a projection apparatus, including:
  • the LED light source comprises a red LED light source, a green LED light source, a blue LED light source and an excitation LED light source, wherein the driving signal of the excitation LED light source and any one of the red LED light source, the green LED light source and the blue LED light source
  • the driving signals of the light source are identical, and the LED light source that matches the driving signal with the driving signal of the excitation LED light source is defined as a designated LED light source;
  • a display driver connected to the LED light source for driving the red LED light source, the green LED light source, the blue LED light source to illuminate, and the driving excitation LED light source to be illuminated;
  • a dichroic lens for illuminating the extinguished LED light source with the light emitted by the excitation LED light source, exciting the extinguished LED light source to emit light of a corresponding color, and reflecting or transmitting the light emitted by the extinguished LED light source;
  • the MCU controller is respectively connected with the LED light source and the display driver for controlling the display driver to drive the red LED light source, the green LED light source, the blue LED light source to be time-divisionly lit, and controlling the display driver drive excitation when the designated LED light source is lit. Light up with the LED light source.
  • the excitation LED light source is located opposite to the LED light source that is inconsistent with the driving signal thereof, the dichroic lens is used to transmit the light emitted by the excitation LED light source, and the light emitted by the LED light source after the reflection is extinguished; or
  • the excitation LED light source is located on the side of the LED light source that is inconsistent with the drive signal, and the dichroic lens is used to reflect the light emitted by the excitation LED light source and the light emitted by the extinguished LED light source.
  • the display driver includes an LED driver supporting 3-way time-division illumination and an independent 1-channel LED driver, and supports three-way time-division LED driver respectively with a red LED light source, a green LED light source, and a blue LED light source. Connected, independent 1 LED driver connected to the excitation LED light source; or
  • the display driver includes four independent 1-channel LED drivers, and an independent 1-channel LED driver is connected to an LED light source.
  • the MCU controller is further configured to set a current for exciting the LED light source.
  • the driving signal of the LED light source for the excitation is consistent with the driving signal of the designated LED light source, and when the designated LED light source is illuminated, the excitation is used.
  • the LED light source is also illuminated at the same time, and the light emitted by the LED light source is excited by the dichroic lens to illuminate the extinguished LED light source, and the extinguished LED light source emits light of a corresponding color, and the light emitted by the extinguished LED light source is emitted by the designated LED light source.
  • Projection after light mixing can improve the brightness of the micro projector, and has less influence on the color gamut and power, making the projection picture clearer. Even if the projection display screen is far away, there is no need to move the projector, and the projection picture can be clearly viewed.
  • FIG. 1 is a schematic structural diagram of a projection apparatus applied to an embodiment of a method of the present application
  • FIG. 2 is a waveform diagram of driving signals of an LED light source of a projection device in the prior art
  • FIG. 3 is a waveform diagram of driving signals of an LED light source of a projection apparatus applied to an embodiment of the method of the present application;
  • FIG. 4 is a schematic diagram showing the functional structure of a projection apparatus according to an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a projection device applied by the method, and the projection device includes an LED.
  • the LED light source comprises a red LED light source 10, a green LED light source 20, a blue LED light source 30, and an excitation LED light source 40, and a pulse of the red LED light source 10, the green LED light source 20, and the blue LED light source 30 Timing occurs in a time-sharing manner, with collimating optical elements disposed directly in front of each LED light source;
  • the dichroic lens includes a first dichroic lens 50 and a second dichroic lens 60.
  • the first dichroic lens 50 is disposed in parallel with the second dichroic lens 60, and the first dichroic lens 50 is disposed on the outgoing light path of the green LED light source 20 and the blue LED light source 30 for transmitting blue light or reflecting green light;
  • the dichroic lens 60 is disposed on the red LED light source 10, and on the outgoing light path through which the first dichroic lens 50 transmits blue light and reflects green light for transmitting blue light, green light, or reflected red light.
  • the driver of the LED light source comprises an LED driver supporting three-way time-division lighting and an independent one-way LED driver, and the driving signal output end of the LED driver supporting the three-way time-division lighting is respectively associated with the red LED light source 10
  • the green LED light source 20 is connected to the drive signal input end of the blue LED light source 30, and the drive signal output end of the independent one-way LED driver is connected to the drive signal input end of the excitation LED light source 40.
  • the driver of the LED light source includes four independent one-way LED drivers, and the driving signal output end of an independent one-way LED driver is connected to the driving signal input end of an LED light source.
  • the use of four independent 1-channel LED drivers can solve the problem that the time-division driving cannot simultaneously illuminate the red LED light source, the green LED light source and the blue LED light source.
  • the green LED light source can be illuminated in the pulse timing of the blue LED light source. vice versa.
  • it is possible to simultaneously mix other color lights in the pulse period of any color light and of course, it is also possible to simultaneously mix and emit two or more color lights.
  • the method includes:
  • Step 110 preset a driving signal of the excitation LED light source to be consistent with a driving signal of any one of the red LED light source, the green LED light source, and the blue LED light source, and the LED light source that matches the driving signal with the driving signal of the excitation LED light source. Defined as the specified LED light source.
  • the excitation LED light source 40 is a blue light source
  • the driving signal of the excitation blue LED light source 40 is set to coincide with the driving signal of the blue LED light source 30, and the blue LED light source 30 is defined as the designated LED light source.
  • Step 120 When the designated LED light source is lit, the excitation LED light source is also lit at the same time, and the remaining LED light sources are turned off, and the light emitted by the excitation LED light source is irradiated on the extinguished LED light source through the dichroic lens, and the extinguished LED is excited.
  • the light source emits light of a corresponding color, and the light emitted by the extinguished LED light source is mixed with the light emitted by the designated LED light source and projected.
  • the excitation LED light source When the designated LED light source is lit, the excitation LED light source is also lit at the same time. Due to the time-sharing driving principle, the other LED light sources are turned off, and the light emitted by the excitation LED light source is irradiated on the extinguished LED light source through the dichroic lens, and the excitation is extinguished.
  • the LED light source emits light of a corresponding color.
  • the light emitted by the LED light source is excited, and its brightness is controlled by a current pulse of its driving signal, and the current magnitude can be further set by the MCU controller of the projection device. It can be understood that the larger the current pulse, the greater the brightness.
  • the excitation LED light source is located opposite the LED light source that is inconsistent with its drive signal, the dichroic lens is used to transmit light emitted by the excitation LED light source, and to reflect light emitted by the extinguished LED light source.
  • the excitation LED source is located on the side of the LED source that is inconsistent with its drive signal, the dichroic lens is used to reflect the light emitted by the excitation LED source, and the light emitted by the extinguished LED source is excited.
  • the excitation blue LED light source is located opposite the green LED light source, the first dichroic lens 50 can only penetrate the blue light to reflect the green light, and when the blue LED light source is lit, the excitation blue LED light source is used. At the same time, the blue light emitted by the blue LED light source is excited to be irradiated on the extinguished green LED light source through the dichroic lens 10. Since the blue LED light source for excitation is similar to the green LED light source, the green LED light source that can be extinguished can be emitted. The green light and the green light are reflected by the first dichroic lens 50 and mixed with the light emitted by the lit blue LED light source.
  • the blue LED light source emits blue light
  • a part of the green light is mixed, and the blue mixed green result causes all the blue-containing display parts to be significantly brightened, such as a white figure, a cyan picture, a blue figure, and a purple color.
  • Graphs, etc. while the gamut value does not change much, the effect on color is very small, the display image after color mixing is obviously clearer than the non-mixed color, please refer to Table 1 for specific data.
  • the brightness value is significantly increased after color mixing, and the color gamut value is only reduced by 8.3%, which does not cause the color change to be too large to distort the display image.
  • the above embodiment specifically provides an implementation of the blue-light mixed green light.
  • the mixed color light-emitting method for improving the projection brightness provided by the embodiment of the present application has various implementation manners, and is not limited to the above manner.
  • the excitation LED light source adopts a blue light source
  • the driving signal of the excitation blue LED light source can be set to be consistent with the driving signal of the red LED light source
  • the red LED light source is defined as the designated LED light source, and when the red LED light source is lit, the excitation is performed.
  • the green LED light source is used to illuminate the extinguished green LED light source to excite green light, and the green light is mixed with the light emitted by the lit red LED light source to achieve the purpose of improving the projection brightness.
  • a blue LED light source that excites the green LED light source to excite the blue light source can be set to emit blue light to be mixed with green light or red light.
  • a red small LED light source can be further arranged, and the red small LED light source is driven by its independent LED driver.
  • the red small LED light source can also be lit, so that the red The red light from the small LED source is mixed with blue or green light.
  • the red small LED light source when the blue LED light source for excitation is excited to emit green light, the red small LED light source simultaneously emits red light, so that the blue light is mixed with green light and red light.
  • the mixed color illuminating method provided by the embodiment of the present application can achieve mixing of any color, and the brightness and color gamut value changes after mixing various colors are shown in Table 2.
  • Table 2 shows the test data under the condition that the power is set to 30W and the color mixing current percentage is set to 10%.
  • the color mixing current value is much smaller than the normal current value, and the normal unmixed driver is dpp6401 Driver Board+RT8452 1.0. After mixing, the driver uses dpp6401 Driver Board+RT8452 1.0*2.
  • the mixing of other colors has a large difference in brightness and color gamut.
  • the brightness of the blue mixed red light is increased by 1.98%, and the color gamut value is up to 84.8. %, indicating that the blue light mixed red light has less influence on color and no distortion; when the red light mixes green light, the brightness increases by 6.83%, but the color gamut drops to 73.2%, indicating that the red light mixed with green light will affect the image.
  • Color rendering Therefore, in terms of selecting color mixing, the effects of different modes of color mixing on brightness and color gamut can be comprehensively considered according to actual needs.
  • the color-mixing light-emitting method for improving projection brightness of the embodiment further includes: setting a current of the excitation LED light source.
  • FIG. 2A is a waveform diagram of driving signals of an LED light source of a projection device in the prior art.
  • the image has 60 frames per second and the time axis is 1/60 seconds.
  • the pulse width and height of each LED light source are not Similarly, the specific control can be controlled by the MCU controller, wherein the pulse height represents the current magnitude, and the color timing of the light source is generally cyclically appearing in red, green and blue, respectively corresponding to the driving signal output timing of each LED light source.
  • FIG. 2B is a diagram showing driving signal waveforms of a projection apparatus applied by the method.
  • the blue LED light source and the excitation blue LED light source use the same pulse, and thus the pulse position of the blue LED light source.
  • the current for exciting the blue LED light source can be set by the MCU controller.
  • FIG. 3 shows the test data under the condition that the power is set to 30 W and the color mixture current percentage is set to 10% and 30%, respectively. It can be seen from Fig. 3 that the brightness is improved after the color mixing, the color gamut is decreased, and the percentage change of the brightness and the color gamut corresponding to different output currents are different. Specifically, the brightness increases as the color mixing current increases. It can be understood that the larger the current, the larger the power, the brighter the image, and the color gamut decreases as the color mixing current increases, which can be understood as the color mixing current. The larger the color, the more colors will be mixed. Any color mixed with the different colors will cause the color to fade or the color to be distorted. The more different color components are mixed, the more the color gamut will naturally decrease.
  • the percentage of the mixed color current in the embodiment of the present application is 10%-30%, that is, the percentage of the current for setting the excitation LED light source is 10%-30%, which improves the brightness, and Guaranteed color gamut.
  • the color gamut of the blue light mixed green light is more than 80%, the brightness is increased by more than 6%, and the color gamut is slightly lower when the blue light mixed red light is added with green light. At 80%, the brightness increased by more than 7%.
  • the projection device 1000 includes:
  • the LED light source 100 includes a red LED light source, a green LED light source, a blue LED light source, and an excitation LED light source.
  • the driving signal of the excitation LED light source and any of the red LED light source, the green LED light source, and the blue LED light source are included.
  • the driving signals of one LED light source are identical, and the LED light source that matches the driving signal with the driving signal of the excitation LED light source is defined as a designated LED light source;
  • the display driver 200 is connected to the LED light source 100 for driving the red LED light source, the green LED light source, the blue LED light source for time-division lighting, and driving the excitation LED light source to illuminate;
  • the dichroic lens 400 is configured to illuminate the light emitted by the excitation LED light source on the extinguished LED light source, excite the extinguished LED light source to emit light of a corresponding color, and reflect or transmit the light emitted by the extinguished LED light source;
  • the MCU controller 300 is respectively connected to the LED light source 100 and the display driver 200 for controlling the display driver 200 to drive the red LED light source, the green LED light source, the blue LED light source to light-time, and when the designated LED light source is turned on, the control is performed.
  • the display driver 200 drives the excitation LED light source to illuminate.
  • the red LED light source is turned on when the high level of the pulse timing is high and the red LED light source current is not zero, and the red LED light source is turned off when the low level is low; the high level in the pulse timing and the green LED light source current is not zero.
  • the green LED light source will be on, and the green LED light source will be off when the level is low; when the pulse sequence is high and the blue LED source current is not zero, the blue LED light source will be on, and the low level blue LED light source will be Extinguished.
  • the red LED light source, the green LED light source, and the blue LED light source are in a time-sharing driving state, and are not simultaneously illuminated.
  • the MCU controller 300 can control the duty ratio of the LED light source, and the sum of the duty ratios of the LED light sources is 100%.
  • the MCU controller 300 can also set the currents of the red LED light source, the green LED light source, and the blue LED light source.
  • the MCU controller 300 is also used to set the current for the excitation LED source.
  • the excitation LED light source is located opposite the LED light source that is inconsistent with its drive signal, and the dichroic lens 400 is configured to transmit light emitted by the excitation LED light source and to reflect light emitted by the extinguished LED light source.
  • the excitation LED source is located on the side of the LED source that is inconsistent with its drive signal, and the dichroic lens 400 is used to reflect the light emitted by the excitation LED source and the light emitted by the extinguished LED source after excitation.
  • the display driver 200 includes an LED driver for supporting 3-way time-division illumination and an independent 1-channel LED driver, and the driving signal output terminals of the LED driver supporting the 3-way time-division lighting are respectively associated with the red LED light source and the green LED.
  • the light source is connected to the driving signal input end of the blue LED light source, and the driving signal output end of the independent one-way LED driver is connected to the driving signal input end of the excitation LED light source.
  • the driver of the LED light source includes four independent one-way LED drivers, and the driving signal output ends of each of the independent one-way LED drivers are connected to the driving signal input terminals of each of the LED light sources.
  • some general-purpose red, green and blue light sources or a red, green and blue light source plus an excitation light source can also be used, and models such as 1296 or 1981 can also be used. It can also be used with 1261 or other driver chips, which are 3 independent optical models. It can also use 4 independent optical drives for all three RGB lights. It can solve the time-division drive and can not open red and green at the same time. The problem of blue light sources.
  • the technical content in the method embodiment is also applicable to the device embodiment, and therefore, the device embodiment is the same as the method embodiment. The technical content will not be described here.

Abstract

一种提高投影亮度的混色发光方法及投影装置，包括：预设激发用LED光源（40）的驱动信号与红色LED光源（10）、绿色LED光源（20）、蓝色LED光源（30）中任意一LED光源的驱动信号一致，将驱动信号与激发用LED光源（40）的驱动信号一致的LED光源定义为指定LED光源；当指定LED光源点亮时，激发用LED光源（40）也同时点亮，其余LED光源为熄灭状态，激发用LED光源（40）发出的光通过二向透镜照射在熄灭的LED光源上，激发熄灭的LED光源发出相应颜色的光，熄灭的LED光源发出的光与指定LED光源发出的光混合后投射，从而提高微投影仪的亮度，且对色域和功率影响较小。

Description

一种提高投影亮度的混色发光方法及投影装置
本申请要求于2017年10月16日提交中国专利局，申请号为2017109633431，发明名称为“一种提高投影亮度的混色发光方法及投影装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及光学技术领域，特别是涉及一种提高投影亮度的混色发光方法及投影装置。
背景技术
亮度对微投影仪的投影质量至关重要，亮度越高的产品在同等环境光影响下会有更好的显示。目前，市面上主流微投产品均采用DLP技术和LED光源，考虑其便携体积的问题，亮度普遍达不到传统投影仪的程度。便携型微投普遍在200ANSI-500ANSI之间，家用型微投普遍在500ANSI-1000ANSI之间，上千ANSI的微投基本没有，现在很多LED光源的微投影仪的实测亮度普遍存在亮度不高的短板。
亮度受限的原因存在很多方面，比如LED光源的问题，还有DMD芯片问题等。目前使用的LED光源，在绿色的发光效率上比较低，因此整体的RGB LED光源的亮度不高，虽然现在业界也推出了HLD光源，其可以突破1000ANSI亮度的水平，但是实现这个亮度需要更大的空间，产品的体积会增加，无法用在小体积的微投影仪上。
因此，急需一种能明显提高微投影仪的亮度并且对色域和功率影响不大的改进方法，使其在远距离投影时仍能达到清晰显示的要求。
发明内容
本申请实施例主要解决的技术问题是提供一种提高投影亮度的混色发光方法及投影装置，通过提高LED光源的亮度，能够提高微投影仪 的亮度，且对色域和功率影响较小。
为解决上述技术问题，本申请实施例采用的一个技术方案是：提供一种提高投影亮度的混色发光方法，应用于投影装置，投影装置包括LED光源和二向透镜，LED光源包括红色LED光源、绿色LED光源、蓝色LED光源和激发用LED光源，红色LED光源、绿色LED光源和蓝色LED光源的脉冲时序是分时出现的，该方法包括：
预设激发用LED光源的驱动信号与红色LED光源、绿色LED光源、蓝色LED光源中任意一LED光源的驱动信号一致，将驱动信号与激发用LED光源的驱动信号一致的LED光源定义为指定LED光源；
当指定LED光源点亮时，激发用LED光源也同时点亮，其余LED光源为熄灭状态，激发用LED光源发出的光通过二向透镜照射在熄灭的LED光源上，激发熄灭的LED光源发出相应颜色的光，熄灭的LED光源发出的光与指定LED光源发出的光混合后投射。
可选地，激发用LED光源位于与其驱动信号不一致的LED光源的对面，二向透镜用于透射激发用LED光源发出的光，以及反射熄灭的LED光源激发后发出的光；或者
激发用LED光源位于与其驱动信号不一致的LED光源的侧面，二向透镜用于反射激发用LED光源发出的光，以及透射熄灭的LED光源激发后发出的光。
可选地，LED光源的驱动器包括一个支持3路分时点亮的LED驱动器和一个独立1路LED驱动器，支持3路分时点亮的LED驱动器分别与红色LED光源、绿色LED光源和蓝色LED光源连接，独立1路LED驱动器与激发用LED光源连接；或者
LED光源的驱动器包括四个独立1路LED驱动器，一独立1路LED驱动器对应与一LED光源连接。
可选地，激发用LED光源发出的光，其亮度通过其驱动信号的电流脉冲控制。
可选地，熄灭的LED光源发出的光与点亮的LED光源发出的光混合后，混合光的亮度随电流脉冲增大而增大，混合光的色域随电流脉冲增 大而降低。
可选地，激发用LED光源的电流百分比为10％-30％。
本申请实施例还提供一种投影装置，包括：
LED光源，LED光源包括红色LED光源、绿色LED光源、蓝色LED光源和激发用LED光源，其中，激发用LED光源的驱动信号与红色LED光源、绿色LED光源、蓝色LED光源中任意一LED光源的驱动信号一致，将驱动信号与激发用LED光源的驱动信号一致的LED光源定义为指定LED光源；
显示驱动器，与LED光源连接，用于驱动红色LED光源、绿色LED光源、蓝色LED光源点亮，以及驱动激发用LED光源点亮；
二向透镜，用于使激发用LED光源发出的光照射在熄灭的LED光源上，激发熄灭的LED光源发出相应颜色的光，以及反射或透射熄灭的LED光源发出的光；
MCU控制器，分别与LED光源和显示驱动器连接，用于控制显示驱动器驱动红色LED光源、绿色LED光源、蓝色LED光源分时点亮，以及当指定LED光源点亮时，控制显示驱动器驱动激发用LED光源点亮。
可选地，激发用LED光源位于与其驱动信号不一致的LED光源的对面，二向透镜用于透过激发用LED光源发出的光，以及反射熄灭的LED光源激发后发出的光；或
激发用LED光源位于与其驱动信号不一致的LED光源的侧面，二向透镜用于反射激发用LED光源发出的光，以及透过熄灭的LED光源激发后发出的光。
可选地，显示驱动器包括一个支持3路分时点亮的LED驱动器和一个独立1路LED驱动器，支持3路分时点亮的LED驱动器分别与红色LED光源、绿色LED光源和蓝色LED光源连接，独立1路LED驱动器与激发用LED光源连接；或者
显示驱动器包括四个独立1路LED驱动器，一独立1路LED驱动器对应与一LED光源连接。
可选地，MCU控制器，还用于设置激发用LED光源的电流。
本申请实施例的有益效果是：区别于现有技术的情况，本申请实施例通过预设激发用LED光源的驱动信号与指定LED光源的驱动信号一致，当指定LED光源点亮时，激发用LED光源也同时点亮，激发用LED光源发出的光通过二向透镜照射在熄灭的LED光源上，激发熄灭的LED光源发出相应颜色的光，熄灭的LED光源发出的光与指定LED光源发出的光混合后投射，能够提高微投影仪的亮度，且对色域和功率影响较小，使得投影画面更清晰，即使投影显示屏距离较远也无需搬动投影仪，仍能清晰观看投影画面。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍。显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请方法实施例应用的一种投影装置的结构示意图；
图2是现有技术中投影装置的LED光源的驱动信号波形图；
图3是本申请方法实施例应用的一种投影装置的LED光源的驱动信号波形图；
图4是本申请实施例的投影装置的功能结构示意图。
具体实施方式
下面将结合附图对本申请的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
此外，下面所描述的本申请不同实施方式中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。
实施例1
本申请实施例提供一种提高投影亮度的混色发光方法，该方法应用于采用LED光源的投影装置，请参阅图1，图1为该方法应用的一种投影装置的结构示意图，投影装置包括LED光源和二向透镜，其中，LED光源包括红色LED光源10、绿色LED光源20、蓝色LED光源30和激发用LED光源40，红色LED光源10、绿色LED光源20和蓝色LED光源30的脉冲时序是分时出现的，每一LED光源的正前方设置有准直光学元件；二向透镜包括第一二向透镜50和第二二向透镜60。
第一二向透镜50与第二二向透镜60平行设置，第一二向透镜50设置在绿色LED光源20和蓝色LED光源30的出射光路上，用于透射蓝光或反射绿光；第二二向透镜60设置在红色LED光源10，以及经第一二向透镜50透射蓝光和反射绿光的出射光路上，用于透射蓝光、绿光或反射红光。
可选地，LED光源的驱动器包括一个支持3路分时点亮的LED驱动器和一个独立1路LED驱动器，支持3路分时点亮的LED驱动器的驱动信号输出端分别与红色LED光源10、绿色LED光源20和蓝色LED光源30的驱动信号输入端连接，独立1路LED驱动器的驱动信号输出端与激发用LED光源40的驱动信号输入端连接。
在另一实施例中，LED光源的驱动器包括四个独立1路LED驱动器，一独立1路LED驱动器的驱动信号输出端对应与一LED光源的驱动信号输入端连接。采用四个独立1路LED驱动器可以解决分时驱动不能同时点亮红色LED光源、绿色LED光源和蓝色LED光源的难题，比如，在蓝色LED光源的脉冲时序里可以点亮绿色LED光源，反之亦然。采用类似的方式可以实现在任意颜色光的脉冲时段同时混入其他颜色光，当然也可以满足两种以上颜色光同时混合发出。
该方法包括：
步骤110：预设激发用LED光源的驱动信号与红色LED光源、绿色LED光源、蓝色LED光源中任意一LED光源的驱动信号一致，将驱动信号与激发用LED光源的驱动信号一致的LED光源定义为指定LED光源。
如，本实施例中，激发用LED光源40采用蓝色光源，设置激发用 蓝色LED光源40的驱动信号与蓝色LED光源30的驱动信号一致，将蓝色LED光源30定义为指定LED光源。
步骤120：当指定LED光源点亮时，激发用LED光源也同时点亮，其余LED光源为熄灭状态，激发用LED光源发出的光通过二向透镜照射在熄灭的LED光源上，激发熄灭的LED光源发出相应颜色的光，熄灭的LED光源发出的光与指定LED光源发出的光混合后投射。
指定LED光源点亮时，激发用LED光源也同时点亮，由于分时驱动原理，其余LED光源为熄灭状态，激发用LED光源发出的光通过二向透镜照射在熄灭的LED光源上，激发熄灭的LED光源发出相应颜色的光。
其中，激发用LED光源发出的光，其亮度通过其驱动信号的电流脉冲控制，电流大小可进一步通过投影装置的MCU控制器设置。可以理解，电流脉冲越大，则其亮度也越大。
在一些实施例中，激发用LED光源位于与其驱动信号不一致的LED光源的对面，二向透镜用于透射激发用LED光源发出的光，以及反射熄灭的LED光源激发后发出的光。
在一些实施例中，激发用LED光源位于与其驱动信号不一致的LED光源的侧面，二向透镜用于反射激发用LED光源发出的光，以及透射熄灭的LED光源激发后发出的光。
如，本实施例中，激发用蓝色LED光源位于绿色LED光源的对面，第一二向透镜50只能穿透蓝光反射绿光，当蓝色LED光源点亮时，激发用蓝色LED光源也同时点亮，激发用蓝色LED光源发出的蓝光通过二向透镜10照射在熄灭的绿色LED光源上，由于激发用蓝色LED光源与绿色LED光源结构类似，可以激发熄灭的绿色LED光源发出绿光，绿光经第一二向透镜50反射后与点亮的蓝色LED光源发出的光混合。
通过上述方式，蓝色LED光源发出蓝光时混入了一部分绿光，蓝混绿的结果使得所有含蓝色的显示部分明显变亮，比如白色的图、青色的图、蓝色的图、紫色的图等，同时色域值变化不大，对色彩影响非常小，混色后的显示图像明显比不混色时候清晰明亮，具体数据请参考表1。
亮度值混色后明显增加，色域值仅仅降低8.3％，不会造成颜色变化 太大使显示画面失真。
表1
Figure PCTCN2018080926-appb-000001
由表1看出，当混色的绿色部分电流(即为激发用蓝色LED光源的电流)为正常不混色时绿色部分电流(即为绿色LED光源的电流)的30％情况时，即在混入的绿色电流远小于不混色的正常电流的情况下，蓝色混合一部分绿色后，功率差为3.45W，变化很小，不会造成功率损耗。
上述实施例具体给出了蓝光混绿光的一种实现方式，本领域技术人员应当理解，本申请实施例提供的提高投影亮度的混色发光方法具有多种实现方式，而不仅仅限于上述方式。
例如，激发用LED光源采用蓝色光源，可设置激发用蓝色LED光源的驱动信号与红色LED光源的驱动信号一致，将红色LED光源定义为指定LED光源，当红色LED光源点亮时，激发用蓝色LED光源照射在熄灭的绿色LED光源上激发出绿光，绿光与点亮的红色LED光源发出的光混合，实现提高投影亮度的目的。
同理，由于蓝色LED光源与绿色LED光源结构类似，可以设置激发用绿色LED光源来激发熄灭的蓝色LED光源发出蓝光，使之与绿光或者红光混合。
另外，还可以再设置一红色小LED光源，该红色小LED光源由其独立的LED驱动器驱动，在蓝色LED光源或者绿色LED光源点亮时，红色小LED光源也同样可以点亮，使红色小LED光源发出的红光与蓝光或者绿光混合。
进一步的，在上述实施例的基础上，可设置激发用蓝色LED光源激发出绿光时，红色小LED光源同时发出红光，使蓝光混合绿光加红光。
本申请实施例提供的混色发光方法可以使任意颜色实现混合，各种颜色混合后亮度和色域值变化情况参见表2所示。
表2
Figure PCTCN2018080926-appb-000002
表2(续)
Figure PCTCN2018080926-appb-000003
表2示出了功率设定为30W，混色电流百分比设定为10％的条件下的测试数据，混色电流值远远小于正常电流值，且正常不混色的驱动采用dpp6401 Driver Board+RT8452 1.0，混色后驱动采用dpp6401 Driver Board+RT8452 1.0*2。
综合比较来看，当蓝光混合绿光或者蓝光混合绿光加红光时，亮度增加百分比和色域值达到了最佳状态，蓝色部分亮度值均会成倍增加，白色组合光的亮度分别增加了6.02％和7.82％，同时色域值分别达到了82.3％和79.2％，相比正常不混色时的色域值88.1％略有下降，但均不会使显示画面的颜色出现失真。
而其他颜色的混合相比上述混合方式相比，在亮度和色域方面有较大差距，以白色复合光亮度为基准，蓝光混合红光时亮度增加了1.98％，色域值可达最大84.8％，说明蓝光混合红光对颜色的影响较少也不会出现失真；红光混合绿光时亮度增加了6.83％，但色域下降到了73.2％，说明红光里面混入绿光会影响图像的色彩呈现。因此，在选择混色方面， 可根据实际需要综合考虑不同方式的混色对亮度和色域的影响。
实施例2
与上述实施例不同的是，本实施例的提高投影亮度的混色发光方法还包括：设置激发用LED光源的电流。
请参阅图2A，图2A为现有技术中投影装置的LED光源的驱动信号波形图，图像一秒有60帧，时间轴为1/60秒，每一LED光源对应的脉冲宽度及高度均不一样，具体都可以通过MCU控制器控制，其中，脉冲高度即代表电流大小，光源投出的色彩时序一般为红绿蓝依次循环出现，分别对应于每一LED光源的驱动信号输出时序。
请参阅图2B，图2B示出了该方法应用的一种投影装置的驱动信号波形图，蓝色LED光源和激发用蓝色LED光源用的同一个脉冲，因此在蓝色LED光源的脉冲位置对应出现了小型绿色脉冲，只是激发用蓝色LED光源的电流相对比较小，因此出现的绿色脉冲比较矮。本实施例可通过MCU控制器设置激发用蓝色LED光源的电流。
请参阅图3，图3示出了功率设定为30W，混色电流百分比分别设定为10％和30％的条件下的测试数据。从图3可以看出，混色后亮度有所提高，色域有所下降，且不同输出电流所对应的亮度变化百分比和色域不相同。具体地，亮度随着混色电流增大而增大，可以理解为电流越大，功率越大，图像就会越亮，而色域反而随着混色电流的增大而降低，可以理解为混色电流越大混入的颜色就会越多，任何颜色与混入的不同颜色混合后都会导致色彩变淡或者色彩失真，混入的不同颜色成分越多色域自然会降低越多。
因此，熄灭的LED光源发出的光与点亮的LED光源发出的光混合后，混合光的亮度随激发用LED光源的驱动信号的电流脉冲增大而增大，混合光的色域随该电流脉冲增大而降低。基于此，为了保证色域不会降低太多，本申请实施例选择混色电流百分比为10％-30％，即设置激发用LED光源的电流百分比为10％-30％，既提高了亮度，又保证了色域。在一优选的实施例中，混色电流百分比为10％的条件下，蓝光混合绿光后色域 达到了80％以上，亮度增加了6％以上，蓝光混合红光加绿光时色域略低于80％，亮度增加了7％以上。
实施例3
本申请实施例还提供一种投影装置，请参阅图4，该投影装置1000包括：
LED光源100，LED光源100包括红色LED光源、绿色LED光源、蓝色LED光源和激发用LED光源，其中，激发用LED光源的驱动信号与红色LED光源、绿色LED光源、蓝色LED光源中任意一LED光源的驱动信号一致，将驱动信号与激发用LED光源的驱动信号一致的LED光源定义为指定LED光源；
显示驱动器200，与LED光源100连接，用于驱动红色LED光源、绿色LED光源、蓝色LED光源分时点亮，以及驱动激发用LED光源点亮；
二向透镜400，用于使激发用LED光源发出的光照射在熄灭的LED光源上，激发熄灭的LED光源发出相应颜色的光，以及反射或透射熄灭的LED光源发出的光；
MCU控制器300，分别与LED光源100和显示驱动器200连接，用于控制显示驱动器200驱动红色LED光源、绿色LED光源、蓝色LED光源分时点亮，以及当指定LED光源点亮时，控制显示驱动器200驱动激发用LED光源点亮。
具体地，在脉冲时序中高电平并且红色LED光源电流不为零的时候，红色LED光源才会亮，低电平时红色LED光源熄灭；在脉冲时序中高电平并且绿色LED光源电流不为零的时候，绿色LED光源才会亮，低电平时绿色LED光源熄灭；在脉冲时序中高电平并且蓝色LED光源电流不为零的时候，蓝色LED光源才会亮，低电平时蓝色LED光源熄灭。
红色LED光源、绿色LED光源、蓝色LED光源为分时驱动状态，不会同时亮，MCU控制器300可以控制上述LED光源的占空比量，而且上述LED光源占空比的总和是100％，MCU控制器300也可以设置红色LED光源、绿色LED光源、蓝色LED光源的电流。
在一些实施例中，MCU控制器300还用于设置激发用LED光源的电流。
在一些实施例中，激发用LED光源位于与其驱动信号不一致的LED光源的对面，二向透镜400用于透射激发用LED光源发出的光，以及反射熄灭的LED光源激发后发出的光。
在一些实施例中，激发用LED光源位于与其驱动信号不一致的LED光源的侧面，二向透镜400用于反射激发用LED光源发出的光，以及透射熄灭的LED光源激发后发出的光。
可选地，显示驱动器200包括一个支持3路分时点亮的LED驱动器和一个独立1路LED驱动器，支持3路分时点亮的LED驱动器的驱动信号输出端分别与红色LED光源、绿色LED光源和蓝色LED光源的驱动信号输入端连接，独立1路LED驱动器的驱动信号输出端与激发用LED光源的驱动信号输入端连接。
在另一实施例中，LED光源的驱动器包括四个独立1路LED驱动器，每一独立1路LED驱动器的驱动信号输出端与每一LED光源的驱动信号输入端连接。
在实际应用中，可采用一些通用红绿蓝光源组成的光机或者红绿蓝光源加激发用光源组成的光机，比如DLP或者液晶等，也可以使用1296或1981等型号光机。还可以采用1261或其他驱动芯片是3路独立的光机型号，还可以4路全部采用独立的驱动器光机，使三种RGB光可以同时点亮，可以解决分时驱动不能同时打开红绿蓝光源的难题。
需要说明的是，由于本申请实施例的装置实施例与方法实施例基于相同的发明构思，方法实施例中的技术内容同样适用于装置实施例，因此，装置实施例中与方法实施例相同的技术内容在此不再赘述。
以上所述仅为本申请的实施例，并非因此限制本申请的范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的保护范围内。

Claims (10)

  1. 一种提高投影亮度的混色发光方法，应用于投影装置，所述投影装置包括LED光源和二向透镜，所述LED光源包括红色LED光源、绿色LED光源、蓝色LED光源和激发用LED光源，所述红色LED光源、绿色LED光源和蓝色LED光源的脉冲时序是分时出现的，其特征在于，所述方法包括：
    预设所述激发用LED光源的驱动信号与所述红色LED光源、绿色LED光源、蓝色LED光源中任意一LED光源的驱动信号一致，将驱动信号与所述激发用LED光源的驱动信号一致的LED光源定义为指定LED光源；
    当所述指定LED光源点亮时，所述激发用LED光源也同时点亮，其余LED光源为熄灭状态，所述激发用LED光源发出的光通过所述二向透镜照射在熄灭的LED光源上，激发所述熄灭的LED光源发出相应颜色的光，所述熄灭的LED光源发出的光与所述指定LED光源发出的光混合后投射。
  2. 根据权利要求1所述的方法，其特征在于，
    所述激发用LED光源位于与其驱动信号不一致的LED光源的对面，所述二向透镜用于透射所述激发用LED光源发出的光，以及反射所述熄灭的LED光源激发后发出的光；或者
    所述激发用LED光源位于与其驱动信号不一致的LED光源的侧面，所述二向透镜用于反射所述激发用LED光源发出的光，以及透射所述熄灭的LED光源激发后发出的光。
  3. 根据权利要求1所述的方法，其特征在于，
    所述LED光源的驱动器包括一个支持3路分时点亮的LED驱动器和一个独立1路LED驱动器，所述支持3路分时点亮的LED驱动器分别与所述红色LED光源、绿色LED光源和蓝色LED光源连接，所述独立1路LED驱动器与所述激发用LED光源连接；或者
    所述LED光源的驱动器包括四个独立1路LED驱动器，一独立1路LED驱动器对应与一LED光源连接。
  4. 根据权利要求1所述的方法，其特征在于，
    所述激发用LED光源发出的光，其亮度通过其驱动信号的电流脉冲控制。
  5. 根据权利要求4所述的方法，其特征在于，
    所述熄灭的LED光源发出的光与点亮的LED光源发出的光混合后，混合光的亮度随所述电流脉冲增大而增大，混合光的色域随所述电流脉冲增大而降低。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，还包括：
    所述激发用LED光源的电流百分比为10％-30％。
  7. 一种投影装置，其特征在于，包括：
    LED光源，所述LED光源包括红色LED光源、绿色LED光源、蓝色LED光源和激发用LED光源，其中，所述激发用LED光源的驱动信号与所述红色LED光源、绿色LED光源、蓝色LED光源中任意一LED光源的驱动信号一致，将驱动信号与所述激发用LED光源的驱动信号一致的LED光源定义为指定LED光源；
    显示驱动器，与所述LED光源连接，用于驱动所述红色LED光源、绿色LED光源、蓝色LED光源点亮，以及驱动所述激发用LED光源点亮；
    二向透镜，用于使所述激发用LED光源发出的光照射在熄灭的LED光源上，激发所述熄灭的LED光源发出相应颜色的光，以及反射或透射所述熄灭的LED光源发出的光；
    MCU控制器，分别与所述LED光源和所述显示驱动器连接，用于控制所述显示驱动器驱动所述红色LED光源、绿色LED光源、蓝色LED光源分时点亮，以及当所述指定LED光源点亮时，控制所述显示驱动器驱动所述激发用LED光源点亮。
  8. 根据权利要求7所述的装置，其特征在于，
    所述激发用LED光源位于与其驱动信号不一致的LED光源的对面，所述二向透镜用于透过所述激发用LED光源发出的光，以及反射所述熄灭的LED光源激发后发出的光；或
    所述激发用LED光源位于与其驱动信号不一致的LED光源的侧面， 所述二向透镜用于反射所述激发用LED光源发出的光，以及透过所述熄灭的LED光源激发后发出的光。
  9. 根据权利要求7所述的装置，其特征在于，
    所述显示驱动器包括一个支持3路分时点亮的LED驱动器和一个独立1路LED驱动器，所述支持3路分时点亮的LED驱动器分别与所述红色LED光源、绿色LED光源和蓝色LED光源连接，所述独立1路LED驱动器与所述激发用LED光源连接；或者
    所述显示驱动器包括四个独立1路LED驱动器，一独立1路LED驱动器对应与一LED光源连接。
  10. 根据权利要求7所述的装置，其特征在于，
    所述MCU控制器，还用于设置所述激发用LED光源的电流。
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