Highly integrated high power, wide color gamut and low speckle laser light source system

Abstract

The present invention discloses a highly integrated high-power, wide color gamut and low-speckle laser light source system, comprising a blue laser light source I (1), a blue laser light source II (6), a green laser light source (7) and a red laser light source (8); the light beam emitted by the blue laser light source I (1) passes through a light homogenizer I (2), a yellow-transmitting blue beam combining mirror I (3) and a lens group I (4) in sequence and is incident on a fluorescent material (5); the light beam emitted by the blue laser light source II (6) passes through a light homogenizer II (6), a reflector (11), a yellow-transmitting blue beam combining mirror II (12), a red-transmitting blue-green beam combining mirror (13) and a lens group II (14) in sequence and is incident on a light pipe (15). The present invention realizes a laser light source with a large color gamut and is integrated with laser dense packing. At the same time, the selection of multiple wavelengths reduces the coherence of the light source, which can effectively suppress laser speckle and has a good market application prospect.

Description

Technical Field

[0001] The present invention relates to the field of laser projection technology, and in particular to a highly integrated high-power, wide color gamut and low-speckle laser light source system applied to a laser fluorescent projection system. Background Art

[0002] As one of the most important equipment in the display industry, projectors have been widely used in education, business, engineering, monitoring, simulation training, cinema projection and other industries since their birth. However, in the current global market, the xenon lamps and high-pressure mercury lamps widely used in projectors have short lifespans, poor colors, limited brightness, high use costs, and are not environmentally friendly. They cannot meet the needs of continuous work 24 hours a day, 7 days a week, such as control and monitoring rooms, large-scale building lighting scenes and other new industry application needs. Red, green and blue (RGB) laser projection display technology makes full use of the characteristics of laser wavelength selectivity and high spectral brightness, so that the displayed image has a larger color gamut expression space, can most realistically reproduce the rich and gorgeous colors of the objective world, and provide more shocking expression. It is known as the ultimate display technology in the display industry.

[0003] Projection display uses clarity and color gamut as the measurement standards for picture quality. The clarity has been upgraded from 1080p to 4k, and the color gamut has been expanded from Rec.709 to DCI-P3, and further upgraded to Rec.2020 color gamut. This is the industry's new requirement for the ultimate color expression of the display picture.

[0004] Currently, the green semiconductor lasers that can be commercialized on the market have only two wavelengths: 520nm and 525nm, and neither of these two wavelengths can cover the color gamut Rec.2020. Figure 2 To cover the color gamut Rec.2020, a 532nm laser must be used. Currently, only solid-state lasers can produce 532nm green light. This type of laser is large in size, high in price, and has poor stability, making it difficult to commercialize in the projection industry. Summary of the invention

[0005] The semiconductor RGB laser diode integrated light source currently on the market cannot cover the color gamut Rec.2020, and the presence of laser speckle causes drastic changes in the grayscale of the image, reducing the image display quality. In response to this technical problem, the purpose of the present invention is to propose a highly integrated high-power, wide color gamut and low speckle laser light source system, which can effectively solve the technical problems of semiconductor RGB laser diode integrated light sources not meeting the color gamut Rec.2020 and severe speckle.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A highly integrated high-power, wide color gamut and low speckle laser light source system comprises a blue laser light source I, a blue laser light source II, a green laser light source and a red laser light source.

[0008] The light beam emitted by the blue laser light source I passes through the light homogenizing sheet I, the yellow-reflecting and blue-transmitting beam combining mirror I and the lens group I in sequence and is incident on the fluorescent material.

[0009] The light beam emitted by the blue laser light source II passes through the light homogenizer II, the reflector, the yellow-reflecting and blue-transmitting beam combining mirror II, the red-reflecting and blue-transmitting beam combining mirror II and the lens group II in sequence and is incident on the light pipe.

[0010] The light beam emitted by the green laser light source passes through the yellow-reflecting and blue-transmitting beam combining mirror II, the red-reflecting and blue-transmitting and green-transmitting beam combining mirror and the lens group II in sequence and is incident on the light pipe.

[0011] The light beam emitted by the red laser light source passes through the light homogenizer III, the red-reflecting and blue-green-transmitting beam combining mirror and the lens group II in sequence and is incident on the light pipe.

[0012] The light beam emitted by the fluorescent material passes through lens group I, anti-yellow and blue-transmitting beam combining mirror I, anti-yellow and blue-transmitting beam combining mirror II, anti-red and blue-transmitting green beam combining mirror and lens group II in sequence and is incident on the light pipe.

[0013] In order to make the semiconductor laser diode integrated light source meet the requirements of Rec.2020, and have a small volume and high power output, the present invention designs the above-mentioned highly integrated high-power, wide color gamut and low speckle laser light source system, uses a relatively low-cost blue laser light source to excite the fluorescent material to produce >532nm color light, and uses a special beam combiner to couple the semiconductor RGB laser diode into the light pipe by wavelength beam combining, which can achieve the requirements of Rec.2020 large color gamut (>532nm light and RGB beam combination to achieve wide color gamut). At the same time, the high-density stacking arrangement of multi-wavelength semiconductor laser diodes can obtain a high-power laser light source (highly integrated high power) to meet the requirements of high-brightness projectors. This multi-wavelength beam combining can significantly reduce speckle (reduce the coherence of the light source) and improve the viewing experience.

[0014] The present invention combines the light-transmitting properties of two beam combiners (the anti-yellow and anti-blue beam combiner and the anti-red and anti-blue-green beam combiner), designs a novel optical light path using the two beam combiners, couples an integrated semiconductor RGB laser diode and a laser fluorescent unit, and realizes a laser densely packed integrated laser light source with a large color gamut. At the same time, the selection of multiple wavelengths reduces the coherence of the light source, which can effectively suppress laser speckle and has a good market application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram showing the structure of the system of the present invention.

[0016] Figure 2A color gamut diagram showing the color gamut satisfied by the system of the present invention, III - large color gamut laser light source.

[0017] Figure 3 It represents the optical characteristics of the yellow-reflecting and blue-transmitting beam combiner.

[0018] Figure 4 It represents the optical characteristics of the red-reflecting and blue-green-transmitting beam combiner.

[0019] In the figure: 1-blue laser light source Ⅰ, 2-light homogenizer Ⅰ, 3-inverted yellow and transparent blue beam combiner Ⅰ, 4-lens group Ⅰ, 5-fluorescent material, 6-blue laser light source Ⅱ, 7-green laser light source, 8-red laser light source, 9-light homogenizer Ⅱ, 10-light homogenizer Ⅲ, 11-reflector, 12-inverted yellow and transparent blue beam combiner Ⅱ, 13-inverted red and transparent blue-green beam combiner, 14-lens group Ⅱ, 15-light pipe. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] The laser light source integrated with semiconductor RGB laser diodes cannot cover the color gamut Rec.2020. Through the implementation of the light source system of this embodiment, the color gamut of the laser light source can meet the requirements of the large color gamut Rec.2020, and a high-power laser light source with high integration, wide color gamut and low speckle can be produced.

[0022] like Figure 1 As shown, a highly integrated high-power, wide color gamut and low speckle laser light source system includes a blue laser light source Ⅰ1, a blue laser light source Ⅱ6, a green laser light source 7 and a red laser light source 8.

[0023] The light beam emitted by the blue laser light source Ⅰ1 passes through the light homogenizer Ⅰ2, the yellow-reflecting and blue-transmitting beam combining mirror Ⅰ3 and the lens group Ⅰ4 in sequence and is incident on the fluorescent material 5.

[0024] The light beam emitted by the blue laser light source II6 passes through the light homogenizer II9, the reflector 11, the yellow-reflecting and blue-transmitting beam combining mirror II12, the red-reflecting and blue-transmitting beam combining mirror 13 and the lens group II14 in sequence and is incident on the light pipe 15.

[0025] The light beam emitted by the green laser light source 7 passes through the yellow-reflecting and blue-transmitting beam combining mirror II 12 , the red-reflecting and blue-transmitting and green-transmitting beam combining mirror 13 and the lens group II 14 in sequence and is incident on the light pipe 15 .

[0026] The light beam emitted by the red laser light source 8 passes through the light homogenizer III 10 , the red-reflecting and blue-green-transmitting beam combining mirror 13 and the lens group II 14 in sequence and is incident on the light pipe 15 .

[0027] The light beam emitted by the fluorescent material 5 passes through the lens group I4, the yellow-reflecting and blue-transmitting beam combining mirror I3, the yellow-reflecting and blue-transmitting beam combining mirror II12, the red-reflecting and blue-transmitting and green-transmitting beam combining mirror 13 and the lens group II14 in sequence and is incident on the light pipe 15.

[0028] The specific process is that the light emitted by the blue laser light source Ⅰ1 passes through the light homogenizer Ⅰ2, transmits through the yellow-transmitting blue beam combiner Ⅰ3, and is focused to the fluorescent material 5 by the lens group Ⅰ4. The blue light source focused on the fluorescent material excites the fluorescent material to produce a color light of >532nm, which is emitted in parallel to the yellow-transmitting blue beam combiner Ⅰ3 through the lens group Ⅰ4 and reflected to the yellow-transmitting blue beam combiner Ⅱ12. The yellow-transmitting blue beam combiner 12 has an attached Figure 3 As shown in the light transmission characteristics, at an incident angle of 45°, the light transmission of 440~470nm is greater than 95%, and the light reflection of 490~675nm is greater than 98%. Another blue laser light source II6 is incident on the reflector 11 after passing through the light homogenizer II9, and is reflected to the yellow-transmitting blue-beam combining mirror II12. The green laser light source 7 is combined with the blue light and the fluorescent excitation light source generated by the fluorescent material 5 through the yellow-transmitting blue-beam combining mirror II12 for wavelength combination. The red laser light source 8 is transmitted through the light homogenizer III10, and is combined with the fluorescent excitation light generated by the blue laser light source II6, the green laser light source 7 and the fluorescent material 5 through the red-transmitting blue-green beam combining mirror 13 for multi-wavelength beam combination. The red-transmitting blue-green beam combining mirror 13 has an attached Figure 4 As shown in the light transmission characteristics, at an incident angle of 45°, the light transmission of 420-620nm is greater than 95%, and the light reflection of 630-675nm is greater than 98%. The light beams transmitted or reflected by the beam combiner are incident at an angle of 45°. The laser light source passes through the red-reflecting blue-green beam combiner 13 and enters the lens group II 14 in parallel for focusing and coupling into the light pipe 15.

[0029] In specific implementation, the wavelength of blue light emitted by blue laser light source I1 and blue laser light source II6 is 448nm, 455nm or 465nm; the wavelength of green light emitted by green laser light source 7 is 520nm or 525nm; the wavelength of green light emitted by red laser light source 8 is 638nm, 639nm or 642nm. This system uses the above multi-wavelength laser light source to combine with the multi-wavelength color light of the fluorescent excitation light generated by the fluorescent material, which can effectively reduce the coherence of the light source and achieve the purpose of eliminating speckles. Figure 1 The novel optical light path shown uses a beam combiner to combine multi-wavelength light sources, which can meet the large color gamut Rec.2020 requirements, thereby realizing a high-power laser light source with high brightness, high cost performance, low speckle and stable performance.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A highly integrated high-power, wide color gamut and low speckle laser light source system, characterized by: It comprises a blue laser light source I (1), a blue laser light source II (6), a green laser light source (7) and a red laser light source (8); The light beam emitted by the blue laser light source I (1) passes through the light homogenizing sheet I (2), the yellow-reflecting and blue-transmitting beam combining mirror I (3) and the lens group I (4) in sequence and is incident on the fluorescent material (5); The light beam emitted by the blue laser light source II (6) first passes through the light homogenizer II (9), is then reflected by the reflector (11), and finally passes through the yellow-reflecting and blue-transmitting beam combining mirror II (12), the red-reflecting and blue-transmitting beam combining mirror (13), and the lens group II (14) in sequence and is incident on the light pipe (15); The light beam emitted by the green laser light source (7) is first reflected by the yellow-reflecting and blue-transmitting beam combining mirror II (12), and then sequentially passes through the red-reflecting and blue-transmitting green beam combining mirror (13) and the lens group II (14) to be incident on the light passage tube (15); The light beam emitted by the red laser light source (8) first passes through the light homogenizer III (10), is then reflected by the red-reflecting, blue-transmitting, and green-transmitting beam combining mirror (13), and finally passes through the lens group II (14) and is incident on the light passage tube (15); The light beam emitted by the fluorescent material (5) first passes through the lens group I (4), is then reflected in turn by the yellow-reflecting and blue-transmitting beam combining mirror I (3) and the yellow-reflecting and blue-transmitting beam combining mirror II (12), and finally passes in turn through the red-reflecting and blue-transmitting and green-transmitting beam combining mirror (13) and the lens group II (14) to enter the light pipe (15); The fluorescent material (5) generates colored light of >532nm under the irradiation of the blue laser light source I (1).

2. The highly integrated high-power, wide color gamut and low speckle laser light source system according to claim 1, characterized in that: The light beams transmitted or reflected by the yellow-reflecting and blue-transmitting beam combining mirror I (3), the yellow-reflecting and blue-transmitting beam combining mirror II (12), and the red-reflecting and blue-transmitting and green-transmitting beam combining mirror (13) are all incident at an angle of 45°.

3. The highly integrated high-power, wide color gamut and low speckle laser light source system according to claim 1 or 2, characterized in that: The blue light emitted by the blue laser light source I (1) and the blue laser light source II (6) has a wavelength of 448 nm, 455 nm or 465 nm; the green light emitted by the green laser light source (7) has a wavelength of 520 nm or 525 nm; and the green light emitted by the red laser light source (8) has a wavelength of 638 nm, 639 nm or 642 nm.

4. The highly integrated high-power, wide color gamut and low speckle laser light source system according to claim 1, characterized in that: The light transmission characteristics of the yellow-reflecting and blue-transmitting beam combining mirror II (12) are: at an incident angle of 45°, the light transmission of 440-470nm is greater than 95%, and the light reflection of 490-675nm is greater than 98%; the light transmission characteristics of the red-reflecting and blue-green-transmitting beam combining mirror (13) are: at an incident angle of 45°, the light transmission of 420-620nm is greater than 95%, and the light reflection of 630-675nm is greater than 98%.

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