CN104914656B - Light-emitting device and relevant projecting system - Google Patents

Abstract

The embodiment of the present invention discloses a light-emitting device and a projection system, which are characterized in that they include: a first solid-state light source that emits light of a first color; a second solid-state light source that emits light of a second color; The light is merged into the same optical path; the filter device including the first filter area and the second filter area respectively transmits at least part of the light of the first color light and at least part of the light of the second color light, with the first The spoke area; the driving device for driving the movement of the filter device, so that the first filter area and the second filter area are periodically located on the outgoing light path of the light combining device; the light source control device for controlling the state of the two light sources, so that the light spot When at least part of the light spot is located in the non-spoke area of the first filter area or the second filter area, only the first solid-state light source or the second solid-state light source is turned on, and when the light spot is completely located in the first spoke area, both light sources are turned on. Embodiments of the present invention provide a light-emitting device that improves brightness and emits multicolor sequential light.

Description

Lighting device and related projection system

The present invention is based on the filing date of August 6, 2012, the application number of 201210277083.X, and the title of the invention is a division of a light emitting device and a related projection system.

technical field

The invention relates to the technical field of illumination and display, in particular to a light emitting device and a related projection system.

Background technique

The principle of the existing projection system is that the images of the three primary colors are respectively projected onto the same screen to produce a complete image with a superimposed effect in human eyes. There are usually two schemes for projection systems. One is that three independent light modulation units simultaneously modulate the three primary colors and project them onto the same screen. For example, white light is divided into red, blue and green light by a set of filters, and is modulated by LCD (Liquid Crystal Display) panel or DMD (Digital Micro mirror Device) to generate and project an image; another One solution is: a light modulation unit receives the sequential light of the three primary colors and modulates to generate an image. When the switching frequency of the images of the three primary colors is fast enough, the human eye will not perceive the change of the primary color light of the image but see is the composite full image.

The sequential light source in the prior art often consists of a white light source and a filter device, for example, a UHP (UltraHigh Power, ultra-high power) bulb and a rotating multi-segment filter color wheel. The filter color wheel is a dish-type device composed of filters. The white light generated by the white light source is incident on the filters of the multi-segment filter color wheel. The filters have the characteristic of selective transmission and can filter the white light into single Shade. When the filter wheel is rotated fast enough, the switching between the final projected three-color image can be avoided by the human eye.

As a new type of light source, LED and other solid-state light sources have the advantages of environmental protection, energy saving, and long service life. They are gradually replacing traditional UHP bulbs and are used in the projection field. Fig. 1 is a schematic structural view of a light-emitting device in the prior art. As shown in Fig. 1, the light-emitting device includes a first solid-state light source 101, a second solid-state light source 102, a third solid-state light source 103, a light-combining device 104, and a light modulation A device 105, a signal transmission device 106, and a light source control device 107. The first solid-state light source 101, the second solid-state light source 102, and the third solid-state light source 103 are red LEDs, green LEDs, and blue LEDs respectively, and the three are sequentially lit by the control of the light source control device 107 and the emitted light passes through the light combining device. 104 are merged into the same light path and emitted as three-color sequential light. The three-color sequential light is collected by a lens and enters the light modulation unit 105, which is a DMD. The light modulation unit 105 modulates incident light of different colors to generate images of three colors, which are output to the projection area to synthesize a complete image.

But the problem of the projection system shown in Fig. 1 is: the traditional DMD is designed for the color wheel, so there will be the time of the spoke light produced by the DMD to the color wheel in the control program of the DMD, and the time setting cannot be zero. When the light spot is incident on the seam of two different filters of the color wheel, the filtered light is not the color of the light emitted by a certain solid-state light source, but the mixed light of the filtered light in the adjacent filter area. It is the spoke light, and the area where the spot is located when the spoke light is generated is the spoke area. However, in the prior art, during the time that the DMD is used to process the spoke light, the light source control device 107 controls the three light sources to be in the off state, which avoids image distortion caused by the DMD modulating the outgoing light of the light combining device 104. Color saturation and grayscale issues. However, since the spoke area generally occupies 10% to 20% of the color wheel area, turning off the light source during this period will cause a significant decrease in the brightness of the light-emitting device. In high occasions, the light source of the existing projection system cannot meet its requirements.

Contents of the invention

The main technical problem to be solved by the present invention is to provide a light emitting device and a projection system capable of increasing brightness and emitting multi-color sequential light.

An embodiment of the present invention provides a light emitting device, which is characterized in that it includes:

A light emitting device, characterized in that it comprises:

a first solid-state light source, the first solid-state light source is used to emit light of a first color;

a second solid-state light source, the second solid-state light source is used to emit light of a second color;

A light combining device, used to receive the first color light and the second color light and combine them into the same light path for emission;

A filter device, the filter device includes adjacent first filter areas and second filter areas, and at least includes a first boundary line, the first boundary line is the first filter area and the second filter area lines where the edges touch;

A driving device, the driving device is used to drive the filter device to periodically move, so that the first filter area and the second filter area of the filter device are periodically located on the outgoing light path of the light emitted by the light combining device;

The light source control device is used to control the power on and off of the first solid-state light source and the second solid-state light source, so that when the incident light spot is located in the first filter area and does not touch the first boundary line, the first solid-state light source remains on, and the second solid-state light source remains on. The two solid-state light sources remain on when the incident light spot is located in the second filter area and do not touch the first boundary line, and the first solid-state light source and the second solid-state light source remain on when the incident light spot touches the first boundary line.

An embodiment of the present invention also provides a projection system, which is characterized by comprising the above-mentioned light emitting device.

Compared with the prior art, the present invention includes the following beneficial effects:

The first solid-state light source and the second solid-state light source respectively emit light of different colors, which can be combined into the same light path by the light-combining device and output to the filter device. The filter device moves periodically under the drive of the drive device, so that the corresponding first filter area and the second filter area on the filter device are located on the outgoing light path in turn, and the light source control device is used to control the first solid-state light source and the second solid-state light source. The on or off state of the solid-state light source, so that when the incident light spot is at least partially located in the non-spoke area of the first filter area, only the first solid-state light source remains on, and when the incident light spot is at least partially located in the non-spoke area of the second filter area When , only the second solid-state light source remains on, so it can be guaranteed that the emitted light is sequential light. When the incident light spot completely enters the first spoke area, the first solid-state light source and the second solid-state light source remain turned on, so at least in one of the spoke areas, spoke light will be generated for modulation by the subsequent DMD to increase the brightness of projection.

Description of drawings

Fig. 1 is a structural front view of an embodiment of a light emitting device in the prior art;

Fig. 2a is a structural left view of an embodiment of a light-emitting device in an embodiment of the present invention;

Fig. 2b is a left side view of the filter device of the light emitting device shown in Fig. 2a;

FIG. 2c is a diagram of the angular distribution of each non-spoke area in Table 1. FIG.

Fig. 2d is a schematic diagram of the control state of the first solid-state light source by the light source control device respectively;

Fig. 2e is a schematic diagram of the control state of the second solid-state light source by the light source control device respectively;

Figure 2f is a schematic diagram of the final output sequence light of the filter device;

Fig. 2g is a schematic diagram of the relationship between the detection device, the driving device, and the filter device in the light emitting device of Fig. 2a;

Fig. 3a is a schematic structural view of the first solid-state light source of the light emitting device shown in Fig. 2a;

Fig. 3b is another structural schematic diagram of the first solid-state light source light-emitting element shown in Fig. 3a;

Fig. 3c is another structural schematic diagram of the first solid-state light source of the light emitting device shown in Fig. 3a;

Fig. 3d is another structural schematic diagram of the first solid-state light source of the light emitting device shown in Fig. 3a;

Fig. 4a is a schematic structural diagram of another embodiment of the light-emitting device in the embodiment of the present invention;

Fig. 4b is a schematic structural view of the first solid-state light source, the second solid-state light source, and the third solid-state light source of the light emitting device shown in Fig. 4a;

Fig. 4c is a left side view of the filter device of the light emitting device shown in Fig. 4a;

FIG. 4d is the angle distribution diagram of each non-spoke area in Table 1. FIG.

Fig. 4e is a schematic diagram of the control state of the first solid-state light source by the light source control device respectively;

Fig. 4f is a schematic diagram of the control state of the second solid-state light source by the light source control device;

Fig. 4g is a schematic diagram of the control state of the third solid-state light source by the light source control device respectively;

Fig. 4h is a schematic diagram of the final output sequence light of the filter device;

Fig. 5a is a schematic structural diagram of another embodiment of the light-emitting device in the embodiment of the present invention;

Fig. 5b is a left side view of the filter device of the light emitting device shown in Fig. 5a;

FIG. 5c is a diagram of the angular distribution of each non-spoke area in Table 2. FIG.

Fig. 5d is a schematic diagram of the control state of the first solid-state light source by the light source control device respectively;

Fig. 5e is a schematic diagram of the control state of the second solid-state light source by the light source control device respectively;

Fig. 5f is a schematic diagram of the control state of the third solid-state light source by the light source control device respectively;

Fig. 5g is a schematic diagram of the final emission sequence light of the filter device;

Fig. 5h is a schematic diagram of the emitted yellow light from the light emitting device shown in Fig. 5a;

Fig. 6a is a schematic structural view of another embodiment of the light emitting device in the embodiment of the present invention;

Fig. 6b is a left side view of the filter device of the light emitting device shown in Fig. 6a;

Fig. 6c is a schematic structural view of the first solid-state light source of the light emitting device shown in Fig. 6a;

Fig. 6d is another schematic structural view of the first solid-state light source of the light emitting device shown in Fig. 6a.

detailed description

Embodiments of the present invention will be described in detail below with reference to the drawings and implementation methods.

Embodiment one

Fig. 2 a is the structure front view of an embodiment of the light emitting device of the present invention, as shown in Fig. 2 a, the light emitting device 200 comprises a first solid-state light source 210, a second solid-state light source 220, a light combining device 230, a filter device 240, a driving Device 250, light source control device 260.

The first solid-state light source 210 is used to emit light of the first color, and the second solid-state light source 220 is used to emit light of the second color. The first solid-state light source 210 and the second solid-state light source 220 respectively include a blue LED array and a yellow LED array. Figure 3a is a schematic structural view of the first solid-state light source 210. As shown in Figure 3a, the first solid-state light source 210 includes a light-emitting element array 31b and a collimator lens array 31a, the light-emitting element array is a blue LED array, and the blue LED array 31b The LEDs correspond to the collimating lenses in the collimating lens array 31a one by one, and the emitted light of the blue LED array is collected and collimated by the collimating lens array 31a before being emitted. The second solid-state light source 220 has the same structure as the first solid-state light source 210 .

However, in other embodiments of the present invention, the LED in FIG. 3a can be replaced by other elements. Fig. 3b is another structural schematic diagram of the light emitting element 31b of the first solid state light source 210 in Fig. 3a. As shown in Fig. 3b, the light emitting element includes a phosphor layer 32a, an LED chip 32b, and a substrate 32c. The phosphor layer 32a is coated on the upper surface of the LED chip 32b. The phosphor layer 32a absorbs the light emitted by the LED chip 32b and is stimulated to generate excitation light. The lower surface of the LED chip 32b is fixed on the substrate 32c. Specifically, the LED chip 32b in the first solid-state light source 210 is an ultraviolet LED, and the phosphor layer 32a is a blue phosphor that receives the ultraviolet light emitted by the LED chip 32b to generate blue light. In fact, in other embodiments of the present invention, the LED chip 32b and the phosphor layer 32a can be set in other types, and the two match to generate the received light. For example, the blue LED excites the green phosphor to generate the green received light. Compared with the green LED with higher efficiency. Here, more than two light-emitting elements comprising phosphor layer 32a, LED chip 32b and substrate 32c can form an array or the structured light-emitting element and LED chips form a mixed array, and a collimating lens is set to process the light emitted by the above-mentioned array. Collimation, as a whole, can be applied to the first solid-state light source 210 as a light source.

In other embodiments of the present invention, the first solid-state light source 210 may also be other types of light sources. Fig. 3c is another schematic diagram of the structure of the first solid-state light source 210. As shown in Fig. 3c, the first solid-state light source 210 includes a single LED chip 33b and a collimating lens 33a. The single LED chip 33b can be customized to obtain the required size and shape by the manufacturer, so the size can be relatively large and have a large light emitting surface. The collimating lens 33a here can also be other devices with collimating effect, such as total internal reflection lens and Fresnel lens and so on. In addition, the single LED chip 33b here can also be replaced with the structure shown in FIG. 3b, that is, the surface of the single LED chip is covered with a phosphor layer. Compared with the LED array, the light source structure shown in Fig. 3c emits more concentrated and uniform light, but the cost is higher due to the need to customize LED chips.

Fig. 3d is another schematic structural diagram of the first solid-state light source 210. As shown in Fig. 3d, the first solid-state light source 210 includes an excitation light source 35a, a wavelength converting device 35b and a collecting device 35c. The excitation light source 210 generates excitation light, which is incident on the wavelength conversion device 35b to generate the received light, which is collected by the collection device 35c and then emitted. The excitation light source 35a may be a light source such as a laser diode or an LED. The wavelength conversion device 35b includes a wavelength conversion layer provided with a wavelength conversion material, and the wavelength conversion material is specifically phosphor powder. In other embodiments of the present invention, the wavelength conversion material may also be materials with wavelength conversion capabilities such as quantum dots and fluorescent dyes, and is not limited to fluorescent powder. Compared with laser light sources composed of laser diodes or laser diode arrays, the brightness of the laser light produced by exciting wavelength conversion materials such as phosphors is much greater than the brightness of the light sources shown in Figure 3a, Figure 3b, and 3c. The wavelength conversion device 35b may also include a driving device, which is used to drive the wavelength conversion layer to rotate periodically, so that the light spot formed by the excitation light on the wavelength conversion layer acts on the wavelength conversion layer along a predetermined path, so as to avoid laser light acting on the wavelength conversion layer for a long time. The same position of the wavelength conversion layer causes the problem of temperature rise of the wavelength conversion layer. In other embodiments of the present invention, the driving device may also drive the wavelength conversion device to move in other ways, such as horizontal reciprocating motion and the like.

The solutions shown in Fig. 3a, Fig. 3c, and Fig. 3d are all based on solid-state light source technology, but the examples in this embodiment do not limit the present invention, and other solid-state light sources can also be used in this embodiment. In addition, in other embodiments of the present invention, the second solid-state light source 220 can also be any one of the light source structures in the above solutions, and the colors of the emitted light from the first solid-state light source 210 and the second solid-state light source 220 can be selected according to needs. use. In addition, when the spectrum of the light emitted by the first light source and the second light source is wide-spectrum light, the emitted light can be modified by a subsequent filter device to remove light in an unnecessary spectral range.

In this embodiment, the light combination device 230 receives the blue light emitted by the first solid-state light source 210 and the yellow light emitted by the second solid-state light source 220 and combines them to emit from the same optical path. The light combination device 230 here is specifically an interference filter, The interference filter 230 can reflect blue light and transmit yellow light. Of course, if the positions of the first solid-state light source 210 and the second solid-state light source 220 are replaced, the optical properties of the interference filter 230 should be correspondingly set to transmit blue light and reflect yellow light.

In the prior art, the spoke area is the area where the incident light spot is located during the time period when the incident light spot touches the boundary line of the adjacent filter area, and the area outside the spoke area in the filter area is the non-spoke area. However, in some specific applications, considering that there may be errors in the setting of the spoke area, the above-mentioned spoke area will be expanded to a certain range to the non-spoke area, thereby defining a new spoke area. The area is the non-filtered area. In the present invention, the defined range of the spoke area does not affect the light source control method of the present invention. Here, the former one in the definition of the above-mentioned spoke area is taken as an example for illustration. Figure 2b is a left view of the structure of the filter device, as shown in Figure 2b, the filter device 240 includes a first filter area 241 and a second filter area 242, the first filter area is used to transmit the light of the first color At least part of the light and reflect other light, the second filter area is used to transmit at least part of the light of the second color light and reflect other light, at least one spoke area is included between the first filter area 241 and the second filter area 242, The spoke area is the first spoke area 243 .

When the incident light spot is completely within the first spoke area 243 , the outgoing light from the first spoke area 243 is a mixture of blue light and yellow light, that is, spoke light. In this embodiment, the first filter area 241 and the second filter area 242 are ring-shaped, and there is another spoke area besides the first spoke area 243 between them, which is the second spoke area 244. When the first filter area 241 and the second filter area 242 are in the shape of a rectangle, there can only be one spoke area between them.

The filter device 240 periodically rotates under the drive of the driving device 250, so that the first filter area 241 and the second filter area 242 of the filter device 240 are periodically located on the optical path of the light emitted by the light combining device 230, and The first spoke regions 243 are periodically located on the outgoing light path. The movement mode of the optical filter device 240 here is periodic rotation. In other embodiments of the present invention, its movement mode can also be other movement modes, such as periodic horizontal reciprocating movement, as long as it is ensured that different filter areas are periodically rotated. It only needs to be located in the outgoing light path of the light combining device 230 .

The on or off states of the first solid-state light source 210 and the second solid-state light source 220 are controlled by the light source control device 260 . For the light source including LED, the on and off of the light source can be controlled by controlling the power supply of the LED chip; for the light source that excites the phosphor, the on and off of the light source can be controlled by controlling the power supply of the excitation light source. When the light spot begins to touch the boundary line between the first filter area 241 and the second filter area 242 in the first spoke area 243 as the starting point, the angle is now zero, and the first spoke area 243 and the second spoke area 244 The angle ranges occupied are 20 degrees respectively. Figure 2c is a schematic diagram of the rotation cycle of the filter device 240, as shown in Figure 2c, 201 represents the period of the first filter area non-spoke area, 202 represents the period of the second filter area non-spoke area, between 201 and 202 The area is the period in which the spoke area is located. 2d and 2e are schematic diagrams of the control states of the first solid-state light source 210 and the second solid-state light source 220, wherein 1 represents the on state, and 0 represents the off state. When the incident light spot is at least partly located in the non-spoke area of the first filter area, the light source control device 260 only controls the first solid-state light source 210 to remain on, and when the incident light spot is at least partially located in the non-spoke area of the second filter area, the light source control device 260 260 only controls the second solid-state light source 220 to keep on. When the incident light spot is completely within the spoke area 244 , the light source control device 260 keeps both the first solid-state light source 210 and the second solid-state light source 220 on. As shown in Figure 2f, the filter device 240 will emit blue monochromatic light in the non-spoke region of the first filter region 241, and the filter device 240 will emit yellow monochromatic light in the non-spoke region of the second filter region 242 , the spoke area 244 between the first filter area 241 and the second filter area 242 will emit blue and yellow mixed light, that is, the spoke light. When the incident light spot gradually transitions from the first filter area 241 to the second filter area 242, from the time the incident light spot completely enters the first spoke area, the outgoing light of the filter device 240 will change from blue monochromatic light to A mixture of blue light and yellow light, and the proportion of yellow light components is increasing. When the light spot at least partly enters the non-spoke area of the second filter area 242, the output light of the filter device 240 will become yellow monochromatic light. The situation is similar when the incident light spot gradually transitions from the second filter area 242 to the first filter area 241 .

It is worth noting that, for the case of enlarging the spoke area, for example, as shown in FIG. The state remains unchanged, and the only difference between the two is that in the first filter area 241, the area between the first spoke area 244 and the second spoke area 245 changes from only the first solid-state light source 210 to the first solid-state light source. The light source 210 and the second solid-state light source 220 are turned on at the same time, but at this time only the outgoing light of the first solid-state light source 210 can pass through this area, so the outgoing light of this area does not change. Analyzing the area between the first spoke area 244 and the second spoke area 245 in the second filter area 241, it is also found that the outgoing light in this area has not changed, so no matter whether the original spoke area is expanded or not It is a new spoke area, which will not affect its light emitting effect.

The outgoing light of the filter device 240 is the outgoing light of the light emitting device 200 , and the outgoing light will be guided to the light modulation device 201 by a subsequent device for modulation. The light modulating device 201 is generally a DMD, and its modulation cycle has a fixed modulation wheel spoke light period. Compared with the prior art, during the spoke light modulation period of the DMD, the light source is turned off and the light-emitting device does not emit any light. The light-emitting device in this embodiment can emit spoke light during this period and enter it into the DMD for modulation. . The light-emitting device of this embodiment simulates spoke light by using a filter device and is applied in projection, thereby improving the brightness of projection, and has the advantage of being easy to implement.

The light emitting device 200 in this embodiment may also include a detection device 270, which is used to detect the position of the region on the optical path on the filter device 240 and generate a position signal, and transmit the position signal to the light source control device 260 . The light source control device 260 receives the position signal and controls the on and off states of the first solid-state light source 210 and the second solid-state light source 220 according to the position signal. For example, as shown in FIG. 2g, a black strip is set on the rotating shaft 251 of the driving device 250, and the detection device 270 is a sensor. When the sensor 270 detects the black strip, it will generate a position signal to the light source control device 260. For example, the position signal is a high voltage signal, and it is a low voltage signal when the sensor 270 does not detect a black stripe. When the sensor 270 detects the position of the black strip, the area position of the filter device 240 in the optical path is correspondingly determined. In the position of zone 242 , the light source control device 260 will turn on the second solid state light source 220 . The detection device 270 can generate a position signal when a fixed position of the filter device 240 enters the optical path in each period, so that the light source control device 260 can control the first solid-state light source 210 and the second solid-state light source 220 more accurately.

Preferably, the light emitting device 200 further includes a light adjusting device 280 , the light adjusting device 280 collects the outgoing light of the light combining device 230 and reduces the divergence angle thereof before emitting to the light filtering device 240 . Specifically, the angle adjusting device 280 in this embodiment is a lens, and the lens 180 collects the outgoing light of the light combining device 230, and adjusts it to enter the filter device 240, so as to reduce the divergence angle of the outgoing light, so that part of the light that would have been The reflected high-angle incident light is transmitted from the filter device 240 to reduce light loss due to the angular drift characteristic of the filter device. In other embodiments, the light adjustment device 280 can also be a CPC (Compound Parabolic Concentrator, compound parabolic collector) or other forms of integrating rods, and can also be other forms of optical conical rods that can reduce the beam divergence angle. device.

Embodiment two

Fig. 4a is a structural schematic diagram of another embodiment of the light emitting device of the present invention. As shown in Fig. 4a, the light emitting device 400 includes a first solid-state light source 410, a second solid-state light source 420, a third solid-state light source 430, a light combining device 440, a lens 450 , a light source control device 460 , a filter device 470 , a drive device 490 and a detection device 480 .

The light emitting device 400 in this embodiment differs from the light emitting device in the embodiment shown in FIG. 2a in that:

(1) In this embodiment, besides the first solid-state light source 410 and the second solid-state light source 420 , the light-emitting device 400 also includes a third solid-state light source 430 for emitting light of a third color. The first solid-state light source 401 , the second solid-state light source 420 , and the third solid-state light source 430 are respectively a red light source, a green light source and a blue light source. The structures of the first solid-state light source 410 , the second solid-state light source 420 and the third solid-state light source 430 may be any one of the structural examples of the first solid-state light source 210 in the first embodiment. For example, as shown in FIG. 4b, the first solid-state light source 410 is an LED array, the second solid-state light source 420 is a blue laser-excited green phosphor light source, and the third solid-state light source 430 is a single-chip LED chip.

(2) The light combination device 440 combines the outgoing light of the first solid-state light source 410 , the second solid-state light source 420 , and the third solid-state light source 430 into a single light path, and the light combination device 404 here is specifically a cross-shaped filter. In other embodiments of the present invention, the light combination device 404 may be other structures, such as optical filters arranged in parallel, which may be specifically arranged according to the distribution of light sources. In addition, the number of light sources in the present invention is not limited to two, but may be more than three light sources, and they can use different wavelengths to combine light or different spatial positions to combine light. The light-combining device is a well-known technology in the art, and will not be described in detail here.

(3) Fig. 4c is a schematic structural view of the filter device 470 shown in Fig. 4a. As shown in Fig. 4c, the filter device 470 includes a first filter area 471, a second filter area 472, and a third filter area 473, which are red filter, green filter and blue filter respectively. A first spoke area 474 is included between the first filter area 471 and the second filter area 472 . A spoke area is included between the second filter area 472 and the third filter area 473 , which is the second spoke area 475 . A spoke area is included between the first filter area 471 and the third filter area 473 , which is the third spoke area 476 . Here, the incident light spot starts to touch the boundary line between the first filter area 471 and the third filter area 473 as the starting point. At this time, the angle of the filter device is 0, and the angular distribution of each area in the clockwise direction is shown in Table 1. Show:

starting angle/degree End point angle/degree The first filter area non-spoke area 10 90 first spoke area 90 110 The second filter area non-spoke area 110 220 second spoke area 220 240 The third filter area non-spoke area 240 350 third spoke area 350 370(10)

Table 1

Figure 4d is the angle distribution diagram of each non-spoke area in Table 1, as shown in Figure 4d, the filter device 470 emits red light in the first filter area non-spoke area 471a, and in the second filter area non-spoke area 472a The inner filter device 470 emits green light, and the inner filter device 470 emits blue light in the non-spoke region 473a of the third filter region. 4e-4g are schematic diagrams of the control states of the first solid-state light source 410, the second solid-state light source 420, and the third solid-state light source 430 respectively by the light source control device 460. The abscissa represents the rotation angle of the filter device 470, and the ordinate represents the voltage of the light source. state, 1 represents the start state, and 0 represents the off state. When the incident light spot is at least partly located in the non-spoke region of the first filter region 471, the light source control device 460 only controls the first solid-state light source 410 to remain on and emit red light; When the incident light spot is at least partly located in the non-spoke area of the second filter area 472, the light source control device 460 only controls the second solid-state light source 420 to keep on and emit green light; when all the incident light spots are located in the first spoke area 474, the light source control device 460 The device 460 controls both the first solid-state light source 410 and the second solid-state light source 420 to keep on and emit red and green mixed light; The three solid-state light sources 430 remain on and emit blue light; when the incident light spots are all located in the second spoke area 475, the light source control device 460 controls the third solid-state light source 430 and the second solid-state light source 420 to remain on and emit green-blue mixed light; When all are located in the third spoke area 476 , the light source control device 460 controls both the first solid-state light source 410 and the third solid-state light source 430 to keep on, and emit red and blue mixed light. Figure 4h is a schematic diagram of the final output sequence light of the filter device 470, as shown in Figure 4h, when the light spot enters the first spoke area 474 from the side of the first filter area 471, the red light component in the output light of the filter device 470 gradually decreases, and the green light component gradually increases until the light spot at least partially enters the non-spoke area of the second filter area 472, and the outgoing light becomes green light. When the light spot enters the second spoke area 475 or the third spoke area 476, the situation is similar.

The light emitted by the filter device 470 will be incident on the light modulation device 401 for modulation, and the light modulation device 401 is a DMD. The DMD can modulate the spoke light emitted from the first spoke area 474 , the second spoke area 475 and the third spoke area 476 , thereby improving the brightness of projection. Compared with the situation in the prior art that the light source is turned off during the DMD modulates the spoke light, in this embodiment, when the incident light spots are all located in the first spoke area 474, the light source control device 460 controls the first solid-state light source If both the 410 and the second solid-state light source 420 are turned on, there will be spoke light emitted, and its brightness will be relatively improved. Of course, preferably, when the incident light spots are all located in the second spoke area 475 , the light source control device 460 controls both the third solid-state light source 430 and the second solid-state light source 420 to be turned on, and the brightness will be further improved. Similarly, when all the incident light spots are located in the third spoke area 476, the light source control device 460 controls both the first solid-state light source 410 and the third solid-state light source 430 to remain on, and the DMD receives the output light of the filter device 470 and performs projection Brightness is also improved.

In this embodiment, when the first solid-state light source 410, the second solid-state light source 420, and the third solid-state light source 430 are all at the maximum power, the brightness of the light emitted by the filter device 470 is the maximum, but due to the various filters on the filter device 470 The size of the area is fixed, and the time ratio of the red light, green light, and blue light in the light emitted by the filter device 470 is fixed, and the three may not exactly achieve white balance. Therefore, preferably, the light source control device 460 can control the first The power of a solid-state light source 410, the second solid-state light source 420, and the third solid-state light source 430, and by adjusting the power, the ratio of the luminous flux of different colors of light in the filter device 470 is adjusted to achieve an appropriate white balance. Here The luminous flux is the total luminous flux emitted in one cycle. Here, the power adjustment method of the light source includes:

A) Obtain the color coordinates (x ₁ , y ₁ ) corresponding to the superimposed spectrum of the outgoing light of the filter device 470 under the maximum power of the first solid-state light source 410, the second solid-state light source 420, and the third solid-state light source 430 respectively;

B) Calculate the distance d ₀ between the color coordinate (x ₁ , y ₁ ) and the target light color coordinate (x ₀ , y ₀ );

C) When the powers of the first solid-state light source 410, the second solid-state light source 420, and the third solid-state light source 430 are separately reduced by one step, and the other two solid-state light sources remain unchanged, the superposition spectrum of the light emitted by the filter device 470 corresponds to The color coordinates are (x _Ri , y _Ri ), (x _Gi , y _Gi ), (x _Bi , y _Bi );

D) Calculate the distance d _Ri , d _Gi , d _Bi between the color coordinates (x _Ri , y _Ri ), (x _Gi , y _Gi ), (x _Bi , y _Bi ) and the target color coordinates (x ₀ , y ₀ ) ;

E) Compare the distances d _Ri , d _Gi , d _Bi , i is an integer greater than or equal to 1, and select the minimum value min(d _Ri , d _Gi , d _Bi ) and min(d _Ri+1 , d Bi ) among the three _Gi+1 , d _Bi+1 ) for comparison, if min(d _Ri , d _Gi , d _Bi )<min(d _Ri+1 , d _Gi+1 , d _Bi+1 ), then choose to obtain min(d _Ri , d _Gi , d _Bi ) corresponding to the power of each solid-state light source; if min(d _Ri , d _Gi , d _Bi )≥min(d _Ri+1 , d _Gi+1 , d _Bi+1 ), then this step Also includes repeating steps C to E until, until min(d _Ri , d _Gi , d _Bi )<min(d _Ri+1 , d _Gi+1 , d _Bi+1 ), choose to obtain min(d _Ri , d _Gi , d _Bi ) corresponding to the power of each solid-state light source is the power of the required solid-state light source.

When initial i=1, min(d _R1 , d _G1 , d _B1 )=d ₀ .

The step size here is the power value of each decrement, and the step size can be set according to the actual situation, for example, it is set to a current change of 0.05A, or a current change of 5%. The step size can be different. Through the above method, the optimal power parameters of the three solid-state light sources can be obtained, and through the control of the light source control device 460 , the best effect of the light emitted by the filter device 470 can be achieved. In other embodiments of the present invention, the number of solid-state light sources may not be three, and the proportion of light emitted by different solid-state light sources can also be adjusted through this method.

Embodiment three

Fig. 5a is a schematic structural diagram of another embodiment of the light emitting device of the present invention. As shown in Figure 5a, the lighting device 500 includes a first solid-state light source 510, a second solid-state light source 520, a third solid-state light source 530, a light combination device 540, a light adjustment device 550, a light source control device 560, a filter device 570, and a detection device. 580 and drive 590.

The difference between the light-emitting device 500 in this embodiment and the light-emitting device in the embodiment shown in FIG. 4a is that, as shown in FIG. In addition to the area 572 and the third filter area 573, a fourth filter area 574 is also included, and the fourth filter area 574 includes a yellow filter. The first filter area 571, the second filter area 572, the third filter area 573, and the fourth filter area 574 of the filter device 570 are driven by the driving device 590, and are periodically located in the light combining device 540 to emit light. on the light path. The spoke area between the second filter area 572 and the first filter area 571 is the first spoke area 575, the spoke area between the second filter area 572 and the fourth filter area 574 is the second spoke area 576, The spoke area between the third filter area 573 and the fourth filter area 574 is the third spoke area 577 , and the spoke area between the first filter area 572 and the third filter area 574 is the fourth spoke area 578 .

Taking the initial position where the incident light spot starts to touch the common boundary line of the first filter area 571 and the third filter area 573 in FIG. As shown in Table 2,

Table 2

Figure 5c is the angular distribution diagram of each non-spoke area in Table 1, as shown in Figure 5c, the filter device 570 emits red light in the non-spoke area 571a of the first filter area, and the non-spoke area of the second filter area The filter device 570 emits green light in the area 572a, the filter device 570 emits blue light in the non-spoke area 573a of the third filter area, and the filter device 570 emits yellow light in the non-spoke area 574a of the fourth filter area. 5d to 5f are schematic diagrams of the control states of the first solid-state light source 510, the second solid-state light source 520, and the third solid-state light source 530 respectively by the light source control device 560. The abscissa represents the angle of the filter device 570, and the ordinate represents the state of the power supply. 1 indicates the start state, and 0 indicates the off state. The difference from the light-emitting device in FIG. 4a is that the fourth filter area 574 in this embodiment is a yellow light filter. The second solid-state light source 520 is turned on at the same time, so that the output light of the light combining device 540 is yellow light. Therefore, when the light spot enters the second spoke area 576 from the second area 572, the light source control device 560 controls the second solid-state light source 520 to keep on. , and at the same time, the first solid-state light source 510 enters the on state from the off state. When the incident light spot is at least partly located in the non-spoke area of the fourth filter area, the first solid-state light source 510 and the second solid-state light source 520 are always turned on. When the light spot completely enters the third spoke area 577 from the fourth filter area 574, the light source control device 560 controls the second solid-state light source 520 and the first solid-state light source 510 to keep on, and the third solid-state light source 530 turns on from the off state. state, and when the light spot part enters the non-spoke area of the third filter area 573, the light source control device 560 controls the first solid-state light source 510 and the second solid-state light source 520 to enter the off state, and the third solid-state light source remains on.

Figure 5g is a schematic diagram of the final output sequence light of the filter device 570. As shown in Figure 5g, the difference from the light emitting device in Figure 4a is that when the light spot enters the second spoke area 576 from one side of the second filter area 572, the filter The green light component in the outgoing light of the light device 570 remains unchanged, and the red light component gradually increases until the light spot part enters the non-spoke area of the fourth filter area 574, and the two are mixed into yellow light. When the light spot completely enters the third spoke area 577 from one side of the fourth filter area 574, the red light component and the green light component in the outgoing light of the filter device 570 decrease, and the blue light component gradually increases until the light spot at least partially enters the third spoke area. In the filter area 573, the emitted light becomes blue light. Figure 5h is a schematic diagram of the yellow light emitted by the filter device 540. In the second spoke area 576, the proportion of yellow light gradually increases, and when at least part of it enters the non-spoke area of the fourth filter area 574, the proportion of yellow light reaches the maximum. It is the superposition of green light and red light, so its intensity is the sum of the intensities of green light and red light. After completely entering the third spoke area 577, the proportion of yellow light gradually decreases to zero. In this embodiment, the light-emitting device can emit light of the fourth color: yellow light. When the light-emitting device is used as a projection light source, the brightness of projection can be significantly improved. It is worth noting that the yellow light emitted in the fourth filter area 574 is formed by mixing the red light emitted by the first solid-state light source 510 and the green light emitted by the second solid-state light source 520, when the first solid-state light source 510 and When the second solid-state light source 520 is at the maximum power, the yellow light may appear color cast, which deviates from the color coordinates of the ideal yellow light. Therefore, preferably, the light source control device in this embodiment can adjust the first solid-state light source 510 and the first solid-state light source 510. The power of the second solid-state light source 520 is used to adjust the ratio of red light and green light in the yellow light. In addition, the method in Embodiment 2 can also be used here to select the optimal power value of the solid-state light source.

Of course, in other embodiments of the present invention, the light emitted from the above-mentioned fourth filter area can be of other colors, as long as the color can be obtained by any two or three of the first solid-state light source, the second solid-state light source, and the third solid-state light source. Synthesis is enough, for example, red, blue, and green three solid-state light sources synthesize white light. Similarly, the light source control device can adjust the ratio of the emitted light of different solid-state light sources in the emitted light of the fourth filter area by adjusting the power of the corresponding solid-state light source.

Embodiment four

Fig. 6a is a schematic structural diagram of another embodiment of the light emitting device of the present invention. As shown in Figure 6a, the lighting device 600 includes a first solid-state light source 610, a second solid-state light source 620, a third solid-state light source 630, a light combination device 640, a light adjustment device 650, a light source control device 660, a filter device 670, a detection device 680 and drive 690.

The difference between the light-emitting device 600 in this embodiment and the example shown in FIG. 4a is that, as shown in FIG. A filter area 673 , a fourth filter area 674 , a fifth filter area 675 , and a sixth filter area 676 . The first filter area 671 and the fourth filter area 674 respectively include different red filters, and respectively transmit the light in the first wavelength range and the light in the second wavelength range in the light emitted by the first solid-state light source 610 and reflect other light , the second filter area 672 and the fifth filter area 675 include different green filters, and can respectively transmit the light of the third wavelength range and the light of the fourth wavelength range in the light emitted by the second solid-state light source 620 and reflect the other light, the third filter area 673 and the sixth filter area 676 include different blue filters, and can transmit the light in the fifth wavelength range and the light in the sixth wavelength range in the light emitted by the third solid-state light source 630 respectively. Reflect other light.

Compared with the light-emitting device shown in Figure 4a, the filter device 670 in this embodiment divides each filter area of the filter device in the example shown in Figure 4a into two filter areas, and the two filter areas The region can transmit light of the same color but with different wavelengths, and the control method of the light source in this embodiment remains unchanged, that is, the light source control device 660 only controls the first when the incident light spot is at least partly located in the non-spoke region of the fourth filter region 674 The solid-state light source 610 remains on, and when the incident light spot is at least partially located in the non-spoke area of the fifth filter area 675, only the second solid-state light source 620 is controlled to remain on, and when the incident light spot is at least partially located in the non-spoke area of the sixth filter area 676 In the spoke area, only the third solid-state light source 630 is controlled to remain on. Therefore, the light-emitting device 600 in this embodiment will emit light including two sets of red, blue, and green sequence lights. The two sets of sequence lights have different wavelength ranges, and can be used as a 3D projection light source.

The first solid-state light source 610 in this embodiment is a wide-spectrum light source, and its spectral wavelength range covers the first wavelength range and the second wavelength range, and can emit two kinds of light through the first filter area 671 and the second filter area 672 respectively. wavelength range of light. Preferably, the first solid-state light source 610 includes a first light emitting element that emits light of a first color in a first wavelength range and a second light emitting element that emits light of a first color in a second wavelength range. FIG. 6c is a schematic structural diagram of the first solid-state light source 610 in this embodiment. As shown in FIG. The second light-emitting element 611b is specifically an LED, wherein the first light-emitting element 611a emits light including the first wavelength range, the second light-emitting element 611b emits light including the second wavelength range, and the mixed light of the two light-emitting elements is emitted to the filter. The first filter area 671 and the fourth filter area 672 of the optical device 670 respectively transmit light in the first wavelength range and the second wavelength range. Fig. 6d shows another structural schematic diagram of the first solid-state light source 610 in this embodiment. Fig. 6d shows two groups of LED arrays for combining light. In this embodiment, the first solid-state light source 610 is used, and the light emitted by the first solid-state light source 610 after being filtered by the filter device 670 has a narrower spectrum and higher color saturation. For the second solid-state light source 620 and the third solid-state light source 630 , the above structure is also applicable.

Preferably, the light source control device 660 can individually control the states of different light-emitting elements in the first solid-state light source. The light emitting element 611a is in the on state, and when the fourth filter area 674 is on the light path of the light emitted by the light combination device 640 , the light source control device 660 only controls the second light emitting element 611b to be in the on state. Through the above method, the different optical elements in the solid-state light source only work during the period when light needs to be emitted, which reduces the power of the solid-state light source and improves work efficiency. It is easy to understand that the above method is also applicable to the second solid-state light source and the third solid-state light source.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

An embodiment of the present invention also provides a projection system, including a light emitting device, and the light emitting device may have the structures and functions in the above-mentioned embodiments. The projection system may adopt various projection technologies, such as liquid crystal display projection technology and digital light processor (DLP, Digital Light Processor) projection technology.

The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (10)

1. A method for adjusting the white balance of a light-emitting device, the light-emitting device comprising a plurality of solid-state light sources emitting light of different colors respectively; the light filter device comprises a plurality of filter areas corresponding to the light of different colors emitted by the solid-state light source, Each filter area transmits light of one color and reflects light of other colors; the filter device is arranged on the optical path of the solid-state light source; It is characterized in that the method comprises: A. Obtain the original color coordinate corresponding to the superimposed spectrum of the outgoing light of the filter device under the maximum power of the solid-state light source; calculate the distance d ₀ between the original color coordinate and the target color coordinate; B. Adjust a solid-state light source in turn and reduce the solid-state light source by one step, fix other solid-state light sources, obtain the i-th adjusted color coordinates corresponding to the superimposed spectrum of the light emitted by the filter device, and calculate the i-th adjusted color coordinates The distance between the color coordinates and the target color coordinates is the minimum value among multiple distances after the i-th adjustment; repeat the previous part of the step B to adjust another solid-state light source in turn; compare the i-th adjusted The distance minimum value d _i and the distance minimum value d _i+1 after the i+1th adjustment, until d _i <d _i+1 , obtain the power of each solid-state light source corresponding to d _i ; C. Output the power of each solid-state light source corresponding to d _i to each solid-state light source, and adjust the luminous flux of the solid-state light source of different colors of light, so as to achieve white balance. 2. The method for adjusting the white balance of a light-emitting device according to claim 1, wherein the solid-state light source comprises a first solid-state light source emitting red light, a second solid-state light source emitting green light, and a third solid-state light source emitting blue light. light source; The filter device includes a first filter area that transmits red light and reflects other wavelengths, a second filter area that transmits green light and reflects other wavelengths, and a third filter area that transmits blue light and reflects other wavelengths; the step B specifically includes : B1. Reduce the power of the first solid-state light source, the second solid-state light source, and the third solid-state light source by one step in turn, and keep the power of the other two solid-state light sources unchanged, and the three color coordinates corresponding to the superimposed spectrum of the light emitted by the filter device ; The step size is the power value of each solid-state light source decrement; B2. Calculate the distances d _Ri , d _Gi , and d _Bi between the three color coordinates and the target color coordinates respectively; B3. Compare min(d _Ri , d _Gi , d _Bi ) and d ₀ , if min(d _Ri , d _Gi , d _Bi )≥d ₀ , select the power of each solid-state light source corresponding to the original color coordinates; if min(d _Ri , d _Gi , d _Bi )<d ₀ , repeat steps B1 and B2; B4. Compare min(d _Ri , d _Gi , d _Bi ) and min(d _Ri+1 , d _Gi+1 , d _Bi+1 ), if min(d _Ri , d _Gi , d _Bi )＜min(d _{Ri +1} , d _Gi+1 , d _Bi+1 ), then choose to obtain the power of each solid-state light source corresponding to min(d _Ri , d _Gi , d _Bi ); if min(d _Ri , d _Gi , d _Bi )≥ min(d _Ri+1 , d _Gi+1 , d _Bi+1 ), then this step also includes repeating steps B1, B2, and B4 until min(d _Ri , d _Gi , d _Bi )<min(d _Ri+1 , d _Gi+1 , d _Bi+1 ), choose to obtain the power of each solid-state light source corresponding to min(d _Ri , d _Gi , d _Bi ) as the power of the required solid-state light source. 3. The method for adjusting the white balance of a light-emitting device according to claim 2, wherein the first solid-state light source is an LED array, the second solid-state light source is a laser-excited green phosphor, and the third solid-state light source is an LED. 4. The method for adjusting the white balance of a light-emitting device according to claim 2 or 3, wherein: The adjustment step of the first solid-state light source is C1, the adjustment step of the second solid-state light source is C2, and the modulation step of the third solid-state light source is C3; The C1, C2, and C3 are not completely the same. 5. The method for adjusting the white balance of a light-emitting device according to claim 2 or 3, wherein: The adjustment step of the first solid-state light source is C1, the adjustment step of the second solid-state light source is C2, and the modulation step of the third solid-state light source is C3; The C1, C2, and C3 are the same. 6. A light emitting device, characterized in that it comprises: a plurality of solid-state light sources emitting light of different colors respectively; the filter device comprises a plurality of filter areas corresponding to the light of different colors emitted by the solid-state light source, and each filter The area transmits light of one color and reflects light of other colors; the filter device is arranged on the light path of the solid-state light source; The light source control device is used to obtain the original color coordinates corresponding to the superimposed spectrum of the outgoing light of the filter device under the maximum power of the solid-state light source, and compare the distance d ₀ between the original color coordinates and the target color coordinates; the adjustment operation is to adjust one by one The solid-state light source and reduce the solid-state light source by one step, fix other solid-state light sources, obtain the i-th adjusted color coordinate corresponding to the superimposed spectrum of the light emitted by the filter device, and calculate the difference between the i-th adjusted color coordinate and the target color coordinate Take the minimum value among multiple distances after the i-th adjustment, and repeat the adjustment operation to adjust another solid-state light source, and compare the i-th adjusted distance minimum d _i with the i+1th time After adjusting the minimum distance d _i+1 until d _i <d _i+1 , the power of each solid-state light source corresponding to d _i is obtained, and the power of each solid-state light source corresponding to d _i is output to each solid-state light source. 7 . The lighting device according to claim 6 , wherein the adjustment of a solid-state light source adopts a fixed step size to decrease the power input to the solid-state light source. 8 . 8. The lighting device according to claim 6 or 7, wherein the light source comprises a first solid-state light source emitting red light, a second solid-state light source emitting green light, and a third solid-state light source emitting blue light. 9. The light emitting device according to claim 7, wherein the second solid-state light source is a laser-excited phosphor. 10. The lighting device according to claim 6 or 7, wherein the light source comprises a first solid-state light source emitting blue light and a second solid-state light source emitting yellow light.