A projection display system

Abstract

The present application discloses a projection display system, which includes: a light source component, a wavelength adjustment component, and a modulation component. The light source component is used to emit projection light; the wavelength adjustment component is arranged in the optical path of the projection light and is used to adjust the spectrum of the projection light so that the ratio of the luminous efficacy of the adjusted projection light to the luminous efficacy of the monochromatic light corresponding to the main wavelength of the projection light is greater than a preset ratio, and the color gamut of the adjusted projection light meets the preset color gamut coverage; the modulation component is arranged in the output optical path of the wavelength adjustment component and is used to perform image modulation on the light emitted by the wavelength adjustment component and output corresponding image light to form a projected image. Through the above method, the present application can balance the brightness and color gamut of the projection display system.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a projection display system. Background Art

[0002] Existing laser projection technology is mainly divided into projection display systems using RGB pure laser as the light source and projection display systems using laser phosphor as the light source; projection display systems using RGB pure laser as the light source can obtain a color gamut close to the extreme, but due to the low visual efficiency of red primary light, it is difficult to obtain sufficient brightness; while traditional projection display systems using laser phosphor as the light source can display higher brightness but usually have a relatively small color gamut. How to balance brightness and color gamut has become an urgent problem to be solved. Summary of the Invention

[0003] The present application provides a projection display system capable of balancing the brightness and color gamut of the projection display system.

[0004] In order to solve the above technical problems, the technical solution adopted in this application is: to provide a projection display system, which includes: a light source component, a wavelength adjustment component and a modulation component, the light source component is used to emit projection light; the wavelength adjustment component is arranged on the optical path of the projection light, and is used to adjust the spectrum of the projection light, so that the ratio of the luminous efficacy of the adjusted projection light to the luminous efficacy of the monochromatic light corresponding to the main wavelength of the projection light is greater than a preset ratio, and the color gamut of the adjusted projection light meets the preset color gamut coverage; the modulation component is arranged on the output optical path of the wavelength adjustment component, and is used to perform image modulation on the light emitted by the wavelength adjustment component, and output corresponding image light to form a projection image.

[0005] Through the above scheme, the beneficial effects of the present application are: the projection display system in the present application includes a light source component, a wavelength adjustment component and a modulation component, the light source component emits projection light, the wavelength adjustment component can filter the projection light; the modulation component modulates the projection laser to generate image light; by adjusting the spectral composition of the projection light, the ratio of the luminous efficacy of the projection light to the luminous efficacy of the monochromatic light of its main wavelength is greater than the preset ratio, and the color gamut of the adjusted projection light meets the preset color gamut coverage, thereby achieving a balance between the luminous efficacy of the projection light and the color gamut coverage of the projection display system. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0007] Figure 1It is a schematic diagram of the spectral luminous efficiency curve under photopic vision;

[0008] Figure 2 It is the Rec.709 standard color gamut diagram;

[0009] Figure 3 It is a schematic diagram of the area illuminated by the incident light on the DMD;

[0010] Figure 4 is a structural diagram of the first embodiment of the projection display system provided by this application;

[0011] Figure 5 This is a schematic diagram of the luminous efficacy of red fluorescence and its dominant wavelength and the intercepted wavelength range;

[0012] FIG6( a ) is a schematic diagram showing the power of each primary color light when red lasers of different wavelengths are used to synthesize a white field;

[0013] FIG6( b ) is a schematic diagram of various white light color ranges when red lasers of different wavelengths are used to synthesize a white field;

[0014] Figure 7 is a structural diagram of a second embodiment of the projection display system provided by this application;

[0015] Figure 8 yes Figure 7 A schematic diagram of the normalized power spectrum of the three primary colors of light in the embodiment shown;

[0016] Figure 9 is a structural diagram of a third embodiment of the projection display system provided by this application;

[0017] Figure 10 yes Figure 9 A schematic diagram of the normalized power spectrum of the three primary colors of light in the embodiment shown;

[0018] Figure 11 is a structural diagram of a fourth embodiment of the projection display system provided by the present application;

[0019] Figure 12 for Figure 11 A schematic structural diagram of a wavelength conversion device in the embodiment shown;

[0020] Figure 13 is a structural diagram of a fifth embodiment of the projection display system provided by the present application;

[0021] Figure 14 is a structural diagram of a sixth embodiment of the projection display system provided by the present application;

[0022] Figure 15 is a structural diagram of a seventh embodiment of the projection display system provided by this application;

[0023] Figure 16 is a structural diagram of an eighth embodiment of the projection display system provided by the present application;

[0024] Figure 17 2 is a schematic structural diagram of the ninth embodiment of the projection display system provided in this application. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] Different wavelengths of light cause different levels of perception in the human eye. For monochromatic light with the same power but different wavelengths, the brightness perceived by the human eye is also different. After a large number of experimental measurements, in a bright environment (brightness greater than 3cd / m 2 ), the sensitivity of the human eye to light reaches its maximum at a wavelength of 555nm, and decreases rapidly when it is away from this wavelength; if P λ The radiant energy flux of watts is equivalent to Ф λ Lumen luminous flux, then its ratio K λ =Ф λ / P λ It can express the number of lumens corresponding to 1 watt of radiant energy flux; the value K corresponding to yellow light with a wavelength of 555nm 555 The maximum is about 683lm / W. The K of any other wavelength of monochromatic light is λ With K 555 The ratio of V to λ represents the relative sensitivity of the human eye to the monochromatic light, which is called spectral luminous efficiency or visibility function. λ Indicates that V λ =K λ / K 555 The spectral luminous efficiency curve under photopic vision adopted by the International Commission on Illumination (CIE) is as follows: Figure 1 shown.

[0027] For light sources, the luminous efficacy of a light source is the ratio of the luminous flux emitted by the light source to the luminous power. The unit is lm / W, which is also called the radiant luminous efficiency of the light source. For a broadband light source, the luminous efficacy is as follows:

[0028]

[0029] Among them, Φ e (λ) is the radiant energy flux of the light source with wavelength λ.

[0030] Almost all colors can be created by mixing the three primary colors RGB in a specific ratio. In display systems, RBG light combinations are usually used to display various colors. For this reason, the display industry has introduced a variety of color standards, including the Rec.709 standard and the DCI / P3 standard. Taking the Rec.709 standard as an example, its specified color gamut is the triangular area surrounded by the three points with color coordinates R (0.64, 0.33), G (0.30, 0.60), and B (0.15, 0.06) in the CIE 1931 standard. The recommended color coordinates of the white field are (0.3127, 0.3290), as shown in the following example: Figure 2 As shown; if three kinds of light with color coordinates corresponding to the three vertex positions are used as the three primary colors of the display system, it can be calculated by the color mixing law that when the brightness proportions of the three primary colors are R: 21.3%, G: 71.5%, and B: 7.2% respectively, they can be combined to produce the recommended white field with coordinates of (0.3127, 0.3290).

[0031] The CIE LUV color space and the CIE1931 XYZ color space are uniform color spaces of different standards. The color space coordinates of the two color spaces can be used to represent and evaluate colors. The conversion relationship between the CIE LUV color space coordinates and the CIE1931 XYZ color space coordinates is:

[0032]

[0033] Where (x, y) is the coordinate value of the CIE1931 XYZ color space, and (u', v') is the coordinate value of the CIE LUV color space.

[0034] Color gamut coverage can characterize the color reproduction ability of the display device. If the test results show that the color coordinates of the test center point of the projector displaying pure RGB field in the CIE 1976 standard are (u' r ,v' r )、(u' g ,v' g ) and (u' b ,v' b ), then the color gamut area is defined as:

[0035]

[0036] Define the color gamut coverage as:

[0037]

[0038] The SJ / T 11346-2015 standard requires that the projector's color gamut coverage be ≥32%, and the GB 32028-2015 standard requires that the color gamut coverage of a high color gamut projector be ≥33%.

[0039] The dominant wavelength is used to describe the color of a pure color light wavelength corresponding to the color of non-pure color light. d If the monochromatic light is mixed with the selected reference white light W in a certain proportion, a color F1 with a certain spectral distribution can be matched. The dominant wavelength of the color F1 is called λ d Since the spectral trajectory of 560nm to 780nm in the color gamut diagram is a straight line, the color F2 whose spectral components only include this wavelength band has color coordinates that are almost identical to the color coordinates of its corresponding monochromatic light with the dominant wavelength. The spectral components of the red primary light in projection display systems often fall within this wavelength range, so its color can be approximately expressed by the dominant wavelength. The dominant wavelength of red primary light in the REC.709 color gamut standard is 611nm, while the dominant wavelength of red primary light in the DCI-P3 color gamut standard is 615nm, and the dominant wavelength of red primary light in the REC.2020 color gamut standard is 630nm.

[0040] The heat load of the digital micromirror device (DMD) mainly comes from the heat loss of the incident light on the DMD. Figure 3 Figure 2 shows a schematic diagram of the area illuminated by incident light on the DMD. The incident light spot can be divided into three areas: the portion of the light spot that extends beyond the reflector array (window area), the edge of the reflector array (boundary area), and the effective area of ​​the reflector array (array area). The area ratio and absorptivity of the window area in the set area are x1 and α1, respectively; the area ratio and absorptivity of the boundary area in the set area are x2 and α2, respectively; and the area ratio and absorptivity of the array area in the set area are x3 and α3, respectively. If the total luminous flux displayed on the screen is Φ, the luminous efficacy is K, and the efficiency of the light incident on the DMD reaching the screen is η1, then the heat load on the DMD is:

[0041]

[0042] Among them, Q electrical The thermal power generated to drive the DMD circuit is usually much smaller than the heat loss of the incident light on the DMD. From this, it can be concluded that improving the luminous efficacy can effectively reduce the thermal load of the DMD. That is, when the thermal load that the DMD can withstand remains unchanged, the total luminous flux displayed on the screen can be effectively increased by improving the luminous efficacy.

[0043] Generally, the closer the main wavelength of red primary light is to 780nm, the lower its corresponding luminous efficacy will be. The luminous efficacy of red primary light will affect the brightness that the projection display system can obtain under the same thermal parameters. When the luminous efficacy decreases, the brightness that the display system can obtain will decrease. At the same time, the lower the luminous efficacy, the greater the color gamut coverage of the projection display system will be, and the color gamut coverage affects the color vividness of the projection display system. Therefore, it is necessary to edit the spectrum of red primary light (including cropping the spectrum and mixing and superimposing multiple light sources) to make the color gamut and brightness more balanced to meet application needs.

[0044] See also Figure 4 , Figure 4 1 is a structural diagram of the first embodiment of the projection display system provided in this application. The projection display system includes: a light source component 11, a wavelength adjustment component 12 and a modulation component 13.

[0045] The light source assembly 11 is used to emit projection light and transmit the projection light to the wavelength adjustment assembly 12. The light source assembly 11 can be a laser-excited fluorescence light source assembly or a three-primary color light source assembly.

[0046] The wavelength adjustment component 12 is disposed in the optical path of the projection light and is used to adjust the spectrum of the projection light to improve the luminous efficacy of the projection light. The color gamut of the adjusted projection light satisfies a preset color gamut coverage. The wavelength adjustment component 12 can be a reflective or transmissive device with wavelength selectivity, including but not limited to a long-pass filter, a short-pass filter, a band-pass filter, a notch filter, a dichroic mirror, or a polarizing dichroic filter. Furthermore, the wavelength adjustment component 12 can also include a supplemental light source, whose wavelength is selected to adjust the spectrum of the corresponding color of light emitted by the light source component 11.

[0047] The modulation component 13 is arranged on the output light path of the wavelength adjustment component 12, and is used to perform image modulation on the light output by the wavelength adjustment component 12 to obtain corresponding image light; wherein, the modulation component 13 includes a spatial light modulator, which can modulate the adjusted projection light output by the wavelength adjustment component 12 and output the modulated light.

[0048] According to formulas (2)-(3), the color gamut coverage is proportional to the color gamut area. When the color coordinates of the light source change, the corresponding color gamut area changes, causing the color gamut coverage to change. Therefore, the color gamut coverage can be adjusted by adjusting the light source's spectrum. According to formula (1), the luminous efficacy of a light source is related to its spectral range. Therefore, by adjusting the light source's spectrum, the luminous efficacy of the light source can be improved, and the luminous efficacy and color gamut can be more balanced.

[0049] For red fluorescence intercepted from a typical yellow phosphor spectrum, the luminous efficacy and main wavelength of the red fluorescence are determined by the intercepted wavelength range, and the relationship is as follows: Figure 5 As shown, curve ① describes the relationship between the luminous efficacy of red fluorescence and the intercepted wavelength range, curve ② describes the relationship between the main wavelength of red fluorescence and the intercepted wavelength range, and curve ③ describes the relationship between the luminous efficacy of monochromatic light of the same color and the wavelength, wherein the horizontal axis is the lower limit of the intercepted wavelength range, and the upper limit of the intercepted wavelength range is 780nm; Figure 5 It can be seen that changing the intercepted wavelength range can effectively change the main wavelength and luminous efficacy of red fluorescence, and the luminous efficacy of red fluorescence is lower than that of monochromatic light with the same color. As the lower limit of the intercepted wavelength range increases, the main wavelength of red fluorescence undergoes a red shift and the luminous efficacy decreases.

[0050] Furthermore, in the RGB pure laser display system, the wavelength of the green laser is generally 525nm, and its color coordinates are (x, y) = (0.114, 0.826), that is, (u, v) = (0.036, 0.586), and the corresponding luminous efficacy is 541.8lm / W; the wavelength of the blue laser is generally 455nm, and its color coordinates are (x, y) = (0.151, 0.023), that is, (u, v) = (0.203, 0.070), and the corresponding luminous efficacy is 32.8lm / W; the power comparison and color gamut size of each primary color light when the red laser of different wavelengths is synthesized with the color coordinates of (x, y) = (0.31, 0.33) is shown in Figure 6. Figure 6 (a) shows the power of the three primary colors when synthesizing 10000lm of white light. The curve Curve ① is the relationship between the power and wavelength of the red laser, curve ② is the relationship between the power and wavelength of the green laser, and curve ③ is the relationship between the power and wavelength of the blue laser; in Figure 6(b), curve ① is the luminous efficacy of the red laser, curve ② is the luminous efficacy of the synthesized white light, and curve ③ is the color gamut coverage; as can be seen from Figure 6: the longer the wavelength of the red laser, the larger the corresponding color gamut, the smaller the luminous efficacy of the red light, the smaller the luminous efficacy of the synthesized white light, the greater the red light power required to display white light of the same brightness, and the greater the total white light power when displaying white light of the same brightness; according to the above analysis, it can be seen that the main wavelength of red light can affect the luminous efficacy, and the spectrum of red light can be adjusted to adjust the color gamut and power to achieve a balance between the color gamut and power. This embodiment is explained by taking the adjustment of the spectrum of red primary light as an example.

[0051] Furthermore, as shown in Figure 6(b), the shorter the wavelength of red light, the smaller the corresponding color gamut. Therefore, to meet the color gamut coverage requirement, this embodiment requires that the spectrum of the red primary light fall within a preset spectral range, which can be 611nm to 620nm. The projection light emitted by the light source assembly 11 covers the spectral range of the three primary colors. This projection light can be red, green, and blue, or blue and yellow. Based on the above description, it can be seen that changing the intercepted wavelength range can effectively change the dominant wavelength and luminous efficacy of the red fluorescence. The luminous efficacy of red fluorescence is lower than that of monochromatic light of the same color. Therefore, in this embodiment, the wavelength adjustment assembly 12 receives the projection light and adjusts the spectrum of the red primary light contained in the projection light, thereby ensuring that the dominant wavelength of the adjusted red primary light is greater than the color gamut of the REC.709 standard, and the ratio of the luminous efficacy of the red primary light to the luminous efficacy of the monochromatic light with its dominant wavelength is greater than 65%.

[0052] In this embodiment, the wavelength adjustment component 12 can be used to adjust the spectrum of the red primary light so that the main wavelength of the red primary light falls within the preset spectral range, and the ratio of the luminous efficacy of the red primary light to the luminous efficacy of the monochromatic light of its main wavelength is greater than the preset ratio, which can make the color gamut of the red primary light exceed the red light color gamut in the preset color standard (such as the REC.709 standard), thereby achieving a balance between the luminous efficacy and the color gamut coverage.

[0053] See also Figure 7 , Figure 7 This is a structural schematic diagram of the second embodiment of the projection display system provided in this application. The projection display system includes a light source component, a wavelength adjustment component, a modulation component, a wavelength conversion device 24 and a transmissive reflective element 25. The light source component includes a blue light laser 211, which is used to generate blue laser light. The wavelength adjustment component includes a filter component 221.

[0054] The wavelength conversion device 24 is arranged on the optical path of the projection light, and is used to receive the projection light and generate corresponding converted light. Specifically, the laser emitted by the blue light laser 211 can be used as the primary color light, or as the excitation light to be incident on the wavelength conversion area on the wavelength conversion device 24. The wavelength conversion area can receive the projection light and generate corresponding converted light. Specifically, a wavelength conversion substance capable of wavelength conversion is provided on the wavelength conversion area. The wavelength conversion substance receives the laser and emits converted light with a wavelength different from that of the laser. The wavelength conversion substance can be a fluorescent material. Fluorescent materials of different colors can emit fluorescence of corresponding colors under the excitation of the excitation light. The fluorescent material can include yellow fluorescent material or green fluorescent material, etc.

[0055] The projection light includes red primary light, the main wavelength of the red primary light is 611nm~620nm, preferably, the main wavelength of the red primary light is 611.4nm, and the preset ratio is 65%, that is, the luminous efficacy of the main wavelength of the red primary light is at least 65% of the luminous efficacy of the monochromatic light of its main wavelength; the filter component 221 is used to filter the converted light to obtain green primary light; the synthesized light is white light, and the color coordinates of the white light are (0.313, 0.329).

[0056] Continue reading Figure 7 The light source component also includes an excitation light source 212, and the wavelength adjustment component also includes a supplementary light source, which is a red laser 222. The red laser 222 is used to generate red laser light, and the excitation light source 212 is used to generate excitation light.

[0057] The blue laser light emitted by the blue laser 211 serves as the blue-primary light. The color coordinates and luminous efficacy of the blue-primary light are (0.136, 0.040) and 50.5 lm / W, respectively. The wavelength of the blue-primary light is 465 nm. That is, a blue laser light with a wavelength of 465 nm is used as the blue-primary light. The blue-primary light is reflected by the yellow-transmitting, blue-reflecting mirror 26 into the subsequent optical path. The excitation light source 212 can be a blue laser. The emission wavelength of the excitation light source 212 is 455 nm. That is, the excitation light with a wavelength of 455 nm can be used to excite the yellow fluorescent material on the wavelength conversion device 24 to produce yellow fluorescence. The yellow fluorescence is transmitted by the yellow-transmitting, blue-reflecting mirror 26 into the subsequent optical path.

[0058] The filter component 221 is also used to filter the converted light to obtain red fluorescence, which together with the red laser light constitutes red primary light. Specifically, the filter component 221 includes a first wavelength adjustment element 2211 , a second wavelength adjustment element 2212 and a third wavelength adjustment element 2213 .

[0059] The first wavelength adjustment element 2211, the second wavelength adjustment element 2212 and the third wavelength adjustment element 2213 are respectively a band-stop filter, a band-stop filter and a short-pass filter. The wavelength range intercepted by the first wavelength adjustment element 2211 is smaller than the wavelength range intercepted by the second wavelength adjustment element 2212, and the wavelength range intercepted by the second wavelength adjustment element 2212 is smaller than the wavelength range intercepted by the third wavelength adjustment element 2213; specifically, the first wavelength adjustment element 2211 is a filter that intercepts a wavelength range of 480nm to 520nm, the second wavelength adjustment element 2212 is a filter that intercepts a wavelength range of 573nm to 592nm, and the third wavelength adjustment element 2213 is a filter with a cut-off wavelength range of 670nm.

[0060] By using these three sets of wavelength adjustment elements to intercept the yellow fluorescence, a spectrum in the 520nm~573nm band can be obtained as the green primary light, that is, the wavelength of the green primary light is 520nm~573nm, and the color coordinates and luminous efficacy of the green primary light are (0.297, 0.687) and 636.0lm / W respectively; the three sets of wavelength adjustment elements intercept the yellow fluorescence to obtain a spectrum in the 592nm~670nm band and use a transflective element 25 with a red reflective film coated on a small central area to combine with a red laser with a wavelength of 638nm to form a common The wavelength of the red primary light, that is, the red fluorescence, is 592nm~670nm, the wavelength of the red laser is 638nm, the luminous flux ratio of the red fluorescence and the red laser is 4:1, the color coordinates of the red primary light are (0.670, 0.330) and 236.7lm / W respectively, and its main wavelength is 611.4nm, which exceeds the red primary color standard of the REC.709 color gamut. The luminous efficacy of the monochromatic light of this main wavelength is 331.5lm / W, and the luminous efficacy of the red primary light is about 71.4% of the luminous efficacy of the monochromatic light of its main wavelength.

[0061] The normalized power spectrum of the three primary colors is as follows: Figure 8 As shown, when the three primary colors are used to mix white light with color coordinates of (0.313, 0.329), the luminous flux of red primary light, green primary light and blue primary light account for 22.9%, 71.9% and 5.19% respectively, and the corresponding power accounts for 30.95%, 36.17% and 32.88% respectively. The luminous efficacy of white light is 320.0lm / W%, and the luminous efficacy of white light is 320.0lm / W. The color gamut coverage of the system is 43.05%.

[0062] If there are three spatial light modulators in the system that modulate the three primary colors of light respectively, and the maximum photothermal load that the spatial light modulator can withstand is Q single , and the efficiency of converting light power into heat power is η2, then the maximum white light brightness that the system can display is 884.6×Q single / η2, a high brightness display is obtained.

[0063] In another specific embodiment, see Figure 9 , Figure 9 This is a structural schematic diagram of the third embodiment of the projection display system provided by the present application. The difference between this embodiment and the second embodiment of the projection display system is that the second wavelength adjustment element 2212 is a filter that cuts off a wavelength range of 573nm to 598nm, and no red laser is added. At this time, the red primary light obtained is a fluorescence in the spectral range of 598nm to 670nm in the yellow fluorescence, that is, the wavelength of the red primary light is 598nm to 670nm, and its luminous efficacy is 251.7lm / W. The luminous efficacy of the red primary light is approximately 75.9% of the luminous efficacy of its main wavelength monochromatic light.

[0064] The normalized power spectrum of the three primary colors is as follows: Figure 10 As shown, when using this three-primary light to mix white light with color coordinates of (0.313, 0.329), the luminous flux of red primary light, green primary light and blue primary light account for 22.9%, 71.9% and 5.19% respectively, and the corresponding power accounts for 29.65%, 36.85% and 33.50% respectively. The luminous efficacy of white light is 325.9lm / W, and the color gamut coverage of the system is 43.05%.

[0065] If there are three spatial light modulators in the system that modulate the three primary colors of light respectively, and the maximum photothermal load that the spatial light modulator can withstand is Q single , and the efficiency of converting light power into heat power is η2, then the maximum white light brightness that the system can display is 884.6×Q single / η2, a high brightness display is obtained.

[0066] In another specific embodiment, Figure 11 This is a structural diagram of the fourth embodiment of the projection display system provided by the present application. The blue laser serves as the blue primary light and the excitation light, and the converted light includes the first converted light and the second converted light.

[0067] The wavelength conversion device 24 and the filter assembly 221 are respectively arranged at different radii of the color wheel; specifically, Figure 12 As shown, the wavelength conversion device 24 and the filter assembly 221 are both annular structures centered on the axis of the color wheel. The wavelength conversion device 24 includes a wavelength conversion region and a scattering region arranged along the circumference of the wavelength conversion device 24. The wavelength conversion region is provided with a yellow wavelength conversion region 241 and a green wavelength conversion region 242. The scattering region is provided with a scattering plate 243, which can scatter the projection light. The wavelength conversion device 24 rotates periodically along the axis of the color wheel. The yellow wavelength conversion region 241, the green wavelength conversion region 242, and the scattering plate 243 periodically pass through the optical path of the blue laser, receive the blue laser, and sequentially emit corresponding fluorescence or scatter the blue laser. The filter assembly 221 is provided with a fourth wavelength adjustment element 2214, a fifth wavelength adjustment element 2215, and a light-transmitting plate 2216 along the circumference of the color wheel. The fourth wavelength adjustment element 2214 and the fifth wavelength adjustment element 2215 are both bandpass filters.

[0068] The fourth wavelength adjustment element 2214 is used to filter the first converted light to generate red fluorescence. Specifically, the fourth wavelength adjustment element 2214 is a filter with a wavelength interception range of 592nm to 670nm. The projection light output by the fourth wavelength adjustment element 2214 is used as red fluorescence. That is, the fourth wavelength adjustment element 2214 intercepts the portion with a wavelength of 592nm to 670nm from the yellow fluorescence as red fluorescence. The red fluorescence is reflected by a transmissive reflective element 25 with a red reflective film coated on a small central area. The red laser with a wavelength of 638nm is combined to form the red primary light. The ratio of the luminous flux of red fluorescence to that of red laser is 4:1. The color coordinates and luminous efficacy of the red primary light are (0.670, 0.330) and 236.7lm / W respectively. Its main wavelength is 611.4nm, which exceeds the red primary color standard of the REC.709 color gamut. The luminous efficacy of monochromatic light of this wavelength is 331.5lm / W, and the luminous efficacy of the red primary light is about 71.4% of that of the monochromatic light of its main wavelength.

[0069] The fifth wavelength adjustment element 2215 is used to filter the second converted light to generate green-primary light. Specifically, the fifth wavelength adjustment element 2215 is a filter that intercepts a wavelength range of 490 nm to 580 nm. That is, the fifth wavelength adjustment element 2215 can intercept the 490 nm to 580 nm band of green fluorescence as green-primary light. Its color coordinates and luminous efficacy are (0.234, 0.680) and 509 lm / W, respectively.

[0070] The light-transmitting sheet 2216 is used to make the blue laser scattered by the scattering sheet 243 serve as blue primary color light; specifically, the light-transmitting sheet 2216 makes the blue light with a wavelength of 455nm scattered by the scattering sheet 243 serve as blue primary color light, and the color coordinates and luminous efficacy of the blue primary color light are (0.151, 0.023) and 32.8lm / W respectively.

[0071] When using this three-primary light to mix white light with color coordinates of (0.313, 0.329), the luminous flux of red primary light, green primary light and blue primary light account for 26.06%, 71.40% and 2.53% respectively, and the corresponding power accounts for 33.62%, 42.83% and 23.55% respectively. The luminous efficacy of white light is 305.3lm / W, and the color gamut coverage of the system is 48.84%, which fully covers the REC.709 color gamut; if the total photothermal load that the spatial light modulator can withstand is Q total , and the efficiency of converting light power into heat power is η2, then the maximum white light brightness that the system can display is 305.3×Q total / η2.

[0072] In other specific embodiments, see Figure 13 , Figure 13This is a structural schematic diagram of the fifth embodiment of the projection display system provided by the present application. The difference between this embodiment and the fourth embodiment of the projection display system is that: the passband of the fourth wavelength adjustment element is 598nm~670nm, and the projection light output by the fourth wavelength adjustment element is directly used as red primary light without adding red laser. The luminous efficacy of the red primary light is 251.7lm / W, and the luminous efficacy of the red primary light is approximately 75.9% of the luminous efficacy of its main wavelength monochromatic light.

[0073] The color coordinates of the red primary light are (0.670, 0.330). When the three primary colors are mixed to form white light with color coordinates of (0.313, 0.329), the luminous flux of the red primary light, the green primary light, and the blue primary light account for 26.06%, 71.40%, and 2.53% respectively, and the corresponding power accounts for 32.26%, 43.71%, and 24.03% respectively. The luminous efficacy of the white light is 311.6 lm / W, and the color gamut coverage of the system is 48.84%, which fully covers the REC.709 color gamut. If the maximum total photothermal load that the spatial light modulator can withstand is Q total , and the efficiency of converting light power into heat power is η2, then the maximum white light brightness that the system can display is 311.6×Q total / η2.

[0074] This embodiment edits the spectrum of the red primary light so that the main wavelength of the red primary light of the projection display system falls within the range of 610nm to 620nm, and the luminous efficacy is at least 65% of the luminous efficacy of the monochromatic light of its main wavelength, thereby making the brightness and color gamut of the projection display system more balanced.

[0075] See also Figure 14 , Figure 14 is a structural diagram of the sixth embodiment of the projection display system provided by this application, and Figure 4 The embodiment shown differs in that the modulation assembly in this embodiment includes multiple modulation devices. Specifically, the modulation assembly may include a first spatial light modulator 331, a second spatial light modulator 332, and a third spatial light modulator 333. These three spatial light modulators modulate the three primary colors of light to form red image light, green image light, and blue image light, respectively. Therefore, the projection display system in this embodiment also includes a light combining assembly 34.

[0076] The light combining component 34 is arranged in the optical path of multiple beams of image light. It is used to combine the image light and output synthesized light. The image light emitted by the first spatial light modulator 331, the second spatial light modulator 332 and the third spatial light modulator 333 are red primary light, green primary light and blue primary light, respectively. The light combining component 34 combines the red primary light, green primary light and blue primary light to generate white light.

[0077] In one embodiment, see Figure 15 , Figure 15 This is a structural diagram of the seventh embodiment of the projection display system provided by the present application. The projection display system is a three-chip DLP projection display system using laser-excited fluorescence as a light source.

[0078] In this embodiment, the light combining assembly includes a TIR (Total Internal Reflection) prism 441 and a Philips prism assembly 442 . Figure 15 The light source assembly is omitted. It can be understood that the structure of the light source assembly can be the same as that of the above Figure 4 、 Figure 7 、 Figure 9 、 Figure 11 as well as Figure 13 The structure of the light source assembly in any of the embodiments is similar and will not be described in detail in this embodiment.

[0079] The filter assembly 421 is a wavelength selection element disposed between the light source assembly and the modulation assembly. Specifically, the filter assembly 421 includes a first wavelength selection element 4211 and a second wavelength selection element 4212 sequentially disposed along the optical path.

[0080] The projection light emitted by the light source assembly is incident on the first wavelength selection element 4211 and the second wavelength selection element 4212 for spectral adjustment. After spectral adjustment, the projection light is totally reflected by the TIR prism 441 and then enters the Philips prism assembly 442. The Philips prism assembly 442 splits the projection light and then respectively enters the first spatial light modulator 431, the second spatial light modulator 432, and the third spatial light modulator 433. The first spatial light modulator 431, the second spatial light modulator 432, and the third spatial light modulator 433 modulate the red primary light, the green primary light, and the blue primary light, respectively, to produce corresponding red image light, green image light, and blue image light. Furthermore, the blue image light, the red image light, and the green image light are combined by the Philips prism assembly 442 and then incident on the imaging optical system 45, where the image is displayed on the projection screen.

[0081] In another embodiment, see Figure 16 , Figure 16 1 is a schematic structural diagram of an eighth embodiment of the projection display system provided in the present application. The projection display system is an LCD (Liquid Crystal Display) projection display system.

[0082] In this embodiment, the modulation component includes a first spatial light modulator 511, a second spatial light modulator 512 and a third spatial light modulator 513. The first spatial light modulator 511, the second spatial light modulator 512 and the third spatial light modulator 513 respectively modulate the red primary light, the green primary light and the blue primary light to obtain corresponding red image light, green image light and blue image light. Figure 16 The light source assembly is omitted. It can be understood that the structure of the light source assembly can be the same as that of the above Figure 4 、 Figure 7 、 Figure 9 、 Figure 11 as well as Figure 13 The structure of the light source assembly in any embodiment is similar and will not be described in detail in this application.

[0083] like Figure 16 As shown, the wavelength adjustment component includes a filter component 521, which is arranged between the second dichroic mirror 542 and the first spatial light modulator 511. The projection light passes through the focusing lens 56 and is incident on the first dichroic mirror 541. The first dichroic mirror 541 is used to transmit green light and reflect light of other wavelength bands, so that the projection light is separated into green-primary light and a mixture of blue-primary light and red-primary light after passing through the first dichroic mirror 541. The green-primary light is further reflected by the reflector 551 and is incident on the second spatial light modulator 512. The mixture of blue-primary light and red-primary light is further incident on the second dichroic mirror 542. The second dichroic mirror 542 is used to reflect red light and transmit light of other wavelength bands. The red-primary light is reflected and then incident on the first spatial light modulator 511. The blue-primary light is further reflected by the reflectors 552 and 553 to the third spatial light modulator 513.

[0084] In another embodiment, see Figure 17 , Figure 17 : is a schematic structural diagram of the ninth embodiment of the projection display system provided by the present application. The projection display system may be an LCOS (Liquid Crystal on Silicon) system. The parameters of the first dichroic mirror, the second dichroic mirror and the filter assembly are the same as those of FIG. Figure 16 The embodiments shown are the same and the working principles are similar, so they will not be described in detail here.

[0085] In this embodiment, the modulation component includes a first light modulator 611, a second light modulator 612 and a third light modulator 613. The first light modulator 611, the second light modulator 612 and the third light modulator 613 respectively modulate the red primary light, the green primary light and the blue primary light to obtain corresponding red image light, green image light and blue image light. Figure 17 The light source assembly is omitted. It can be understood that the structure of the light source assembly can be the same as that of the above Figure 4 、 Figure 7 、 Figure 9 、 Figure 11 as well as Figure 13 The structure of the light source assembly in any of the embodiments is similar, the difference is that the projection light emitted by the light source assembly of this embodiment is polarized projection light, which will not be described in detail in this application.

[0086] like Figure 17 As shown, the wavelength adjustment component includes a filter component 621, which is arranged between the second dichroic mirror 642 and the first spatial light modulator 611; the polarized projection light passes through the focusing lens 63 and is incident on the first dichroic mirror 641, and the first dichroic mirror 641 is used to reflect blue light and transmit light of other bands, so that the polarized projection light is separated into blue primary light and a mixed light of red primary light and green primary light after passing through the first dichroic mirror 641; the blue primary light is further reflected by the reflector 65 and is incident on the third light modulator 613, and the mixed light of the red primary light and the green primary light is further incident on the second dichroic mirror 642, and the second dichroic mirror 642 is used to reflect red light and transmit light of other bands, so that the red primary light is reflected and incident on the first light modulator 611, and the green primary light is transmitted and incident on the second light modulator 612.

[0087] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A projection display system, characterized in that: include: A light source assembly, for emitting projection light; a wavelength adjustment component, disposed in the optical path of the projection light, for adjusting the spectrum of the projection light so that the ratio of the luminous efficacy of the adjusted projection light to the luminous efficacy of monochromatic light corresponding to the main wavelength of the projection light is greater than a preset ratio, and the color gamut of the adjusted projection light satisfies a preset color gamut coverage; a modulation component, disposed on the outgoing light path of the wavelength adjustment component, for performing image modulation on the light emitted by the wavelength adjustment component and outputting corresponding image light; The projection light includes red primary light, the main wavelength of the red primary light is 611nm-620nm, and the preset ratio is 65%.

2. The projection display system according to claim 1, wherein: The projection display system further includes a light combining component, which is disposed on the optical paths of the multiple beams of image light and is used to combine the multiple beams of image light to output combined light.

3. The projection display system according to claim 1, wherein: The projection display system further includes a wavelength conversion device, which is disposed on the optical path of the projection light and is configured to receive the projection light and generate corresponding converted light.

4. The projection display system according to claim 3, wherein: The light source component includes a blue laser, which is used to generate blue laser light; the wavelength adjustment component includes a filter component, which is used to filter the converted light to obtain green-based light.

5. The projection display system according to claim 4, wherein: The wavelength adjustment component further includes a red laser for generating red laser light; the filter component is further used for filtering the converted light to obtain red fluorescence; the red fluorescence and the red laser light constitute the red primary color light.

6. The projection display system according to claim 5, characterized in that The projection display system further includes a transflective element, wherein a central area of ​​the transflective element is coated with a red reflective film, and the red reflective film is used to reflect the received red laser.

7. The projection display system according to claim 4, wherein: The filter component includes a first wavelength adjustment element, a second wavelength adjustment element and a third wavelength adjustment element. The wavelength range intercepted by the first wavelength adjustment element is smaller than the wavelength range intercepted by the second wavelength adjustment element, and the wavelength range intercepted by the second wavelength adjustment element is smaller than the wavelength range intercepted by the third wavelength adjustment element.

8. The projection display system according to claim 4, wherein: The wavelength conversion device is provided with a wavelength conversion region and a scattering plate. The wavelength conversion region is used to receive the projection light and generate corresponding converted light, and the scattering plate is used to scatter the projection light.

9. The projection display system according to claim 8, wherein: The converted light includes a first converted light and a second converted light, and the filter assembly is provided with a fourth wavelength adjustment element, a light-transmitting plate, and a fifth wavelength adjustment element; the fourth wavelength adjustment element is used to filter the first converted light; The fifth wavelength adjustment element is used to filter the second converted light to generate the green primary light; the light-transmitting sheet is used to make the blue laser light scattered by the scattering sheet as the blue primary light.

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