A large color gamut laser light source system integrated by notch beam combining

Abstract

The present invention discloses a large color gamut laser light source system integrated by notch beam combining, comprising a blue laser light source Ⅰ1, an anti-green-transmitting blue beam combining mirror 2, a green laser light source 3, a blue excitation light source 5, an anti-red-transmitting blue-green beam combining mirror 6, a fluorescent unit 7, and a red laser light source 9; the light beam emitted by the blue laser light source Ⅰ1 sequentially passes through the anti-green-transmitting blue beam combining mirror 2, a light homogenizing plate Ⅰ4a, an anti-red-transmitting blue-green beam combining mirror 6, a red notch filter 10, and a lens group Ⅱ11, and is incident on a light guide 12; the light beam emitted by the green laser light source 3 sequentially passes through the anti-green-transmitting blue beam combining mirror (2), a light homogenizing plate Ⅰ4a, an anti-red-transmitting blue-green beam combining mirror 6, a red notch filter 10, and a lens group Ⅱ11, and is incident on a light guide 12. The coupling integration system of the RGB laser light source realizes a coupling mode of multiple light sources with high efficiency and ultra-small volume, which can meet the requirements of large color gamut Rec.2020, and at the same time has high cost performance and a wide range of operating temperature adaptability.

Description

Technical Field

[0001] The present invention relates to the field of laser projection, and in particular to a large color gamut laser light source system integrated by notch beam combining, which is applied to illumination, display, stage lighting and the like. 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 have been difficult to keep up with the pace of the times and cannot meet the needs of 24-hour / daily, 7-day-a-week continuous work, 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 can reproduce the rich and gorgeous colors of the objective world most realistically, provide more shocking expression, and has the characteristics of high brightness, ultra-long life, low use cost and green environmental protection. It is known as the ultimate display technology in the display industry.

[0003] The high definition and wide color gamut of projection display are the industry's pursuit of high-quality image quality. The definition has been upgraded from 1080p to 2k, and now further upgraded to 4k, and the color gamut has been expanded from Rec.709 to DCI-P3. Under the high-definition display of 4k, the Rec.2020 color gamut has emerged, which is the industry's new requirement for the ultimate color and perfect expression of the display screen.

[0004] However, the wavelengths of green semiconductor laser diodes that can be commercialized in the domestic and foreign markets (low price, long life, wide operating temperature range) are only 520nm and 525nm. These two laser wavelengths cannot cover the color gamut Rec.2020 (see attached) Figure 3 As shown, in order to cover Rec.2020, a 532nm laser must be used. Currently, only solid-state lasers can produce 532nm green lasers, but the price of this laser is extremely high, and the luminous stability is severely affected by the operating temperature, making it difficult to commercialize in the projection industry. Summary of the invention

[0005] The existing semiconductor RGB laser diode integrated light source does not meet the requirements of the color gamut Rec.2020. In order to make up for the defect of the existing semiconductor RGB laser diode coupled integration in the color gamut, the present invention designs a novel optical light path using a red light notch filter, couples the integrated semiconductor RGB laser diode and the laser fluorescent unit, and proposes a laser densely packed integrated light source system with a large color gamut through notch beam combining, which can effectively solve the technical problem that the existing semiconductor RGB laser diode coupled integrated light source does not meet the color gamut Rec.2020.

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

[0007] A large color gamut laser light source system integrated by notch beam combining includes a blue laser light source I, a green-reflecting and blue-transmitting beam combining mirror, a green laser light source, a blue excitation light source, a red-reflecting and blue-green-transmitting beam combining mirror, a fluorescent unit, a red laser light source, etc.

[0008] The light beam emitted by the blue laser light source I passes through the green-reflecting and blue-transmitting beam combining mirror, the light homogenizing plate I, the red-reflecting and blue-transmitting beam combining mirror, the red light notch filter and the lens group II in sequence and is incident on the light guide.

[0009] The light beam emitted by the green laser light source passes through the green-reflecting and blue-transmitting beam combining mirror, the light homogenizing plate I, the red-reflecting and blue-transmitting green beam combining mirror, the red light notch filter and the lens group II in sequence and is incident on the light guide pipe.

[0010] The light beam emitted by the blue light excitation light source passes through the light homogenizer II, the red-reflecting and blue-green-transmitting beam combining mirror, and the lens group I in sequence and is incident on the fluorescent unit.

[0011] The light beam emitted by the fluorescent unit passes through lens group I, the red-reflecting and blue-green-transmitting beam combining mirror, the red light notch filter and lens group II in sequence to enter the light guide tube.

[0012] The light beam emitted by the red laser light source passes through the light homogenizer III, the red light notch filter and the lens group II in sequence and enters the light guide pipe.

[0013] Take green as an example: the color gamut green vertex coordinates required by REC2020 are (0.17, 0.797), while the color coordinates of the current green semiconductor laser are (0.114, 0.826). The use of this semiconductor cannot meet the color gamut requirements of REC2020, and it is necessary to replace the light source or add some green light with other color coordinates. The new color coordinates formed by mixing these two color coordinate light sources can meet the requirements of REC2020, such as Figure 5 As shown. The specific calculation method is as follows: Any color of light, regardless of its spectral power distribution, can be mixed with red, green and blue lights in a certain proportion to give the same color light in visual perception. This is the visual basis for the human eye to produce various colors. According to the basic principle of light source colorimetry, the color coordinates of the light source G1 (x1, y1), G2 (x2, y2) and the color coordinates of the light source after light matching G (x, y) are known, and the stimulus values ​​A and B of the two parts of the light source can be calculated by the following formula:

[0014] A*x1+B*x2=x

[0015] A*y1+B*y2=y

[0016] The ratio energies E1 and E2 are further calculated based on the stimulus value and the visual function, as follows:

[0017] E1=A*y1 / V(G1)

[0018] E2=B*y2 / V(G2)

[0019] The ratio of the light distribution light source G1 is: E1 / (E1+E2), and the ratio of the light distribution light source G2 is: E2 / (E1+E2).

[0020] The notch beam combining integration scheme proposed in the present invention realizes the coupling integration of multi-color light sources and forms a laser light source integration system with a large color gamut. By providing a novel optical optical path and optical component design scheme, the semiconductor RGB laser diode and the laser phosphor unit are coupled and integrated in a densely packed manner through the wavelength beam combining and notch beam combining methods, which can effectively meet the color gamut Rec.2020 requirements.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The laser light source made by the prior art, one of which is a laser light source made of red, green and blue semiconductor laser diodes, cannot meet the requirements of the large color gamut Rec.2020. Through the scheme of the present invention, the color gamut of the laser light source can meet the requirements of the large color gamut Rec.2020.

[0023] 2. The second method is to use solid-state lasers. Although this implementation method can also meet the requirements of large color gamut Rec.2020, it is extremely expensive and large in size. At the same time, the ambient temperature and other conditions required for the stable operation of the laser light source are harsh, making it difficult to commercialize in the projection industry, hindering the promotion and use of laser display technology. Through the implementation of the present invention, a large color gamut laser light source with small size, high energy efficiency, loose working environment requirements, and the ability to meet the requirements of large color gamut Rec.2020 and high cost performance can be produced, which fully meets the needs of mass production and commercialization.

[0024] The present invention has a reasonable design. The coupling integration system of the RGB laser light source realizes a high-efficiency and ultra-small volume coupling mode of multiple light sources, which can meet the requirements of the large color gamut Rec.2020. At the same time, it has high cost performance, a wide operating temperature adaptability range, and good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the laser light source system of the present invention is shown.

[0026] Figure 2 A diagram showing the effective fluorescence spectrum used by the laser light source system of the present invention.

[0027] Figure 3 A color gamut curve diagram showing different color gamuts.

[0028] Figure 4 Represents the spectrum curve of the notch filter.

[0029] Figure 5 Schematic diagram showing that two light sources with color coordinates are mixed to form new color coordinates that meet the REC2020 requirements.

[0030] In the figure: 1-blue laser light source I, 2-anti-green and transparent blue beam combining mirror, 3-green laser light source, 4a-light homogenizer I, 4b-light homogenizer II, 4c-light homogenizer III, 5-blue light excitation light source, 6-anti-red and transparent blue-green beam combining mirror, 7-fluorescence unit, 8-lens group I, 9-red laser light source, 10-red light notch filter, 11-lens group II, 12-light guide pipe. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] A large color gamut laser light source system integrated by notch beam combining includes a blue laser light source Ⅰ1, an anti-green and blue beam combining mirror 2, a green laser light source 3, a blue excitation light source 5, an anti-red and blue-green beam combining mirror 6, a fluorescent unit 7, a red laser light source 9, etc.

[0033] The light beam emitted by the blue laser light source Ⅰ1 passes through the anti-green-transmitting-blue beam combining mirror 2, the light homogenizer Ⅰ4a, the anti-red-transmitting-blue-green beam combining mirror 6, the red light notch filter 10 and the lens group Ⅱ11 in sequence and is incident on the light guide 12; the light beam emitted by the green laser light source 3 passes through the anti-green-transmitting-blue beam combining mirror 2, the light homogenizer Ⅰ4a, the anti-red-transmitting-blue-green beam combining mirror 6, the red light notch filter 10 and the lens group Ⅱ11 in sequence and is incident on the light guide 12. Then the blue laser light source Ⅰ1 and the green laser light source 3 are combined by the anti-green-transmitting-blue beam combining mirror 2. After the blue laser light source Ⅰ1 and the green laser light source 3 are combined, they pass through the light homogenizer Ⅰ4a, pass through the anti-red-transmitting-blue-green beam combining mirror 6, pass through the notch filter 10, and finally pass through the lens group Ⅱ11 to couple into the light guide 12.

[0034] The light beam emitted by the blue light excitation light source 5 passes through the light homogenizer II4b, the red-transmitting blue-green beam combiner 6, and the lens group I8 in sequence and is incident on the fluorescent unit 7. The blue light excitation light source 5 passes through the light homogenizer II4b, the red-transmitting blue-green beam combiner 6, and the lens group I8 and is incident on the fluorescent material of the fluorescent unit 7. The fluorescent material can be fluorescent ceramics, fluorescent crystals, or fluorescent powders. The fluorescent material can be implanted into the optical path with a fluorescent wheel that rotates at 20Hz to 120Hz, or implanted into the optical path with fluorescent crystals or fluorescent ceramics that do not need to rotate.

[0035] The light beam emitted by the fluorescent unit 7 passes through the lens group I8, the anti-red and blue-green beam combiner 6, the red light notch filter 10 and the lens group II11 in sequence and enters the light guide 12. The color light of >532nm generated by the fluorescent material under the irradiation of the blue light excitation light source 5 is collected by the lens group I8 and enters the anti-red and blue-green beam combiner 6 to combine the wavelengths of the blue laser light source 1 and the green laser light source 3.

[0036] The light beam emitted by the red laser light source 9 passes through the light homogenizer III4c, the red light notch filter 10 and the lens group II11 in sequence and enters the light guide 12. The red laser light source 9 passes through the light homogenizer III4c, passes through the red light notch filter 10, and performs multi-wavelength light source combination with the blue laser light source I1, the green laser light source 3 and the fluorescent excitation light source generated by the fluorescent material; the laser light source synthesized by the red light notch filter 10 is collected and coupled into the light guide 12 by the lens group II11.

[0037] In order to make semiconductor laser diodes meet the requirements of color gamut Rec.2020, the embodiment of the present invention proposes a novel coupling integration scheme, which integrates RGB semiconductor laser diodes through notch beam combining. The laser phosphor unit (>532nm) is shown in the attached Figure 2 As shown, the spectral curve in the figure is the phosphor excitation spectrum, and the shaded part is the effective spectrum used by the large color gamut laser light source system integrated by notch beam combining, which can achieve the requirements of Rec.2020 large color gamut. At the same time, it has high cost performance and a wide range of operating temperature adaptability, which fully meets the needs of mass production and commercialization.

[0038] Specifically, the red light notch filter has Figure 4 The optical properties shown are specifically reflection of light source wavelengths in the 620nm~660nm band, and transmission of light source wavelengths in two bands: 400nm~620nm and 660nm~700nm.

[0039] The light beams transmitted or reflected by the beam combiner are incident at an angle of 45°. The wavelengths of semiconductor RGB laser diode light sources are 448nm, 455nm, 465nm, 520nm, 525nm, 638nm, 639nm, 640nm, and 642nm. The laser fluorescent unit can be constructed by a blue laser diode and a fluorescent material adapted to the wavelength of the blue light diode to excite the emission of color light > 532nm. By using novel Figure 1 The optical light path shown implements multi-wavelength coupling and completes dense stacking integration, which can achieve a laser integrated light source with a large color gamut of Rec.2020, thereby realizing a laser light source system with a large color gamut, high brightness, small size and stable performance.

[0040] 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 large color gamut laser light source system integrated by notch beam combining, characterized in that: It comprises a blue laser light source I (1), a green-transmitting blue beam combining mirror (2), a green laser light source (3), a blue excitation light source (5), a red-transmitting blue-green beam combining mirror (6), a fluorescent unit (7), and a red laser light source (9); The light beam emitted by the blue laser light source I (1) passes through the anti-green and anti-blue beam combining mirror (2), the light homogenizing plate I (4a), the anti-red and anti-blue and anti-green beam combining mirror (6), the red light notch filter (10) and the lens group II (11) in sequence, and then is incident on the light guide (12); The light beam emitted by the green laser light source (3) is reflected by the anti-green and anti-blue beam combining mirror (2) in sequence, and then transmitted through the light homogenizing sheet I (4a), the anti-red and anti-blue and anti-green beam combining mirror (6), the red light notch filter (10) and the lens group II (11) before being incident on the light guide (12); The light beam emitted by the blue light excitation light source (5) passes through the light homogenizer II (4b), the red-reflecting and blue-green-transmitting beam combining mirror (6), and the lens group I (8) in sequence, and then is incident on the fluorescent material of the fluorescent unit (7); The light beam emitted by the fluorescent unit (7) is sequentially transmitted through the lens group I (8), then reflected by the red-reflecting, blue-transmitting, and green-light-combining mirror (6), then transmitted through the red light notch filter (10) and the lens group II (11), and then incident on the light guide (12); The light beam emitted by the red laser light source (9) is sequentially transmitted through the light homogenizing sheet III (4c), then reflected by the red light notch filter (10), then transmitted through the lens group II (11) and incident on the light guide pipe (12). The fluorescent material generates colored light of >532nm under the irradiation of a blue light excitation light source (5) The optical characteristics of the red light notch filter (10) are that it reflects light sources in the wavelength range of 620nm to 660nm, and transmits light in the wavelength ranges of 400nm to 620nm and 660nm to 700nm.

2. The large color gamut laser light source system integrated by notch beam combining according to claim 1, characterized in that: The fluorescent material on the fluorescent unit (7) is fluorescent ceramic, fluorescent crystal or fluorescent powder.

3. The large color gamut laser light source system integrated by notch beam combining according to claim 1, characterized in that: The light beams transmitted or reflected by the anti-green and anti-blue beam combining mirror (2) and the anti-red and anti-blue and anti-green beam combining mirror (6) are all incident at an angle of 45°.

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