An LCD projector with active color separation illumination

Abstract

The present invention discloses an LCD projector with active color separation illumination, characterized in that it includes a projection light source, a condenser, a collimating lens, an incident polarizer, a dichroic mirror, an LCD light valve, a color combining mirror, an exit polarizer, a field lens, and a projection lens arranged in sequence along the light traveling direction; in the present invention, the RGB three primary color lights of the projection light source are respectively irradiated on the RR, GR, and BR of the LCD light valve, so that ≥2 / 3 of the light originally blocked by the CF corresponding part and the light blocked by the BM corresponding part can pass through the R, G, and B sub-pixels as much as possible or even completely, fundamentally improving the transmittance of the LCD light valve. The present invention improves the total efficiency of the CF and BM of the LCD light valve from 12% - 21% to over 60% - 80%, and the efficiency of the TFT from 40% - 70% to over 60% - 80%, thereby realizing a revolutionary improvement in the efficiency of the optical system, a revolutionary reduction in the heat absorption of the LCD light valve, further achieving a magnitude increase in the output brightness, a huge reduction in the energy consumption of the projector, and also fundamentally helping to improve the color gamut range and white balance of the projected image.

Description

Technical Field

[0001] The present invention relates to the field of projectors, and particularly to an LCD projector with active color separation illumination. Background Art

[0002] A traditional transmissive, full-color LCD projection light valve is mainly composed of materials such as CF (Color Filter, i.e., color film, color filter), BM (Black Matrix, i.e., black matrix, black frame), TFT (Thin Film Transistor), two glass substrates, and liquid crystal sandwiched therebetween in terms of optics. Among them, CF is composed of an array of color filters of three primary colors, namely RR (Red Resist), GR (Green Resist), and BR (Blue Resist); CF and BM are generally fabricated on one glass substrate, and TFT is fabricated on the other glass substrate; the RR, GR, and BR color filter arrays of CF, the light-transmitting window arrays of BM, and the R, G, B sub-pixel (Sub-pixel) arrays of TFT are in one-to-one correspondence; usually, each pixel of TFT consists of three sub-pixels, namely R, G, and B.

[0003] All along, due to the engineering characteristics of materials such as CF, BM, and TFT, the transmission efficiency of CF is about 30%, the light-transmitting window opening rate of BM is about 40%-70%, and the transmission efficiency of TFT is generally only 40%-70%. After calculating the efficiency of the incident and exit polarizers of the LCD light valve, the total transmittance of the LCD light valve to natural light is only about 4%-7%.

[0004] This makes the total efficiency of the optical system of a single LCD projector often at most about 3.5%. Calculated according to the luminous efficiency of current high-color-temperature COB (Chip On Board, high-power integrated surface light source) white LEDs of about 100 Lm / W, when consuming 100 W of power, the projector can only obtain a luminous flux output of 350 Lm, and the gap with DLP, 3LCD, etc. projectors consuming the same power and outputting 2500-4000 Lm is almost of different orders of magnitude.

[0005] Meanwhile, the extremely low transmittance of the LCD light valve means that the CF, BM, and TFT will absorb most of the illumination light and convert it into Joule heat. This makes it extremely difficult to dissipate heat from the light valve when higher brightness is desired. For example, when a projector is designed to output 1000 Lm, dozens of watts of optical power will heat a light valve of a relatively small size (such as 4 inches). Moreover, the thermal conductivity of the glass substrate of the light valve is extremely low, preventing the heat of the liquid crystal and TFT from being quickly conducted to the outer surface of the glass substrate and removed by air cooling or other means, resulting in a black screen after just a few seconds of startup. Therefore, multiple limitations such as energy consumption, heat dissipation, and output brightness fundamentally limit the performance and application of single-LCD projectors.

[0006] See Figures 6-7 , to solve the problem of low efficiency of CF, BM, and TFT, etc., the active color separation technology of single-LCD projectors in the past directly cancelled the CF of the light valve and used three planar beam splitters RL, GL, and BL (the three beam splitters reflect red, green, and blue light respectively), combined with a hexagonal lens array Lns. On the LCD light valve 6' with a "pin" - shaped pixel arrangement, through the further action of the three beam splitters and Lns, the RGB light separated by RL, GL, and BL irradiates the corresponding RGB sub - pixels respectively, achieving the application of improving the efficiency of BM and TFT as much as possible. Although this technology can achieve a relatively high transmission efficiency, its disadvantages are also very obvious: First, even without considering the selection loss of the splitting wavelength, the efficiency of the five light - passing surfaces of the three beam splitters is not high, generally ≤78% (about the 8th power of 0.97); Second, during the splitting process of white light WL into RGB three primary colors, it is very difficult to completely separate the wavelengths, greatly reducing the efficiency of Lns. Especially when there is a synchronous difference in the thermal expansion and contraction between Lns and the LCD light valve 6', RGB color bleeding will occur in the image, which will seriously affect the viewing experience; Third, the optical path differences of the RGB primary color lights separated by RL, GL, and BL are relatively large, increasing the design and production difficulty significantly to reduce the chromatic aberration and distortion of color separation by Lns. At the same time, after the white light illumination light WL with extremely high collimation passes through the three beam splitters, not only does the aperture angle become larger, but the illumination area also increases, so the optical extent (étendue) further increases, which greatly limits the optical extent of the light source and further restricts the luminous flux and utilization rate of the light source; Fourth, for the LCD light valve 6' with a "pin" - shaped pixel arrangement, due to the need to avoid the risk of color bleeding without CF, the aperture ratio is very low, generally ≤40%, etc. Generally speaking, it is only easy to implement and has practical value when the PPI (Pixels Per Inch) of the LCD light valve is about ≤120. Therefore, it completely fails to meet the basic requirements of at least 300 - 900 PPI for single - LCD projectors in recent years.

[0007] In recent years, with the introduction and breakthrough of technologies such as large-area melting, etching, bumping, and precision molding in the domestic optical manufacturing industry chain, as well as the technical breakthrough of some low-refractive-index adhesives, it has become completely possible and highly necessary to conduct essential innovation and breakthrough on LCD light valves. Summary of the Invention

[0008] To solve the above technical problems, the purpose of the present invention is to provide an LCD projector with active color separation illumination, which can achieve the intended effect, with not much increase in cost, having extremely high cost performance, and bringing fundamental changes to the performance and application of the projector.

[0009] An LCD projector with active color separation illumination provided by the present invention includes a projection light source, a condenser, a collimating lens, an incident polarizer, a dichroic mirror, an LCD light valve, a color combining mirror, an exit polarizer, a field lens, and a projection lens, which are arranged in sequence along the direction of light travel.

[0010] The LCD light valve adopts a full-color transmissive structure, mainly including an incident glass, a liquid crystal layer, and an exit glass that are stacked in sequence; a color film and a black matrix are made on the incident glass; a thin-film transistor array is made on the exit glass; the color film is composed of a filter array of three primary colors, namely a red color resist, a green color resist, and a blue color resist; each pixel of the thin-film transistor array is composed of sub-pixels of three primary colors, R, G, and B; the filter array of the three primary colors of the color film, the light-transmitting window array of the black matrix, and the light-transmitting window arrays of the R, G, and B sub-pixels of each pixel of the thin-film transistor array are in one-to-one correspondence; the bisector of a set of parallel sides of the light-transmitting surface of the LCD light valve is the x-axis, the bisector of the other set of parallel sides is the y-axis, the intersection of the x-axis and the y-axis is the optical center of the LCD light valve, and the optical axis perpendicular to the xy plane passing through the optical center is the z-axis.

[0011] The pixels of the LCD light valve are arranged in a stripe pattern, and the R, G, and B sub-pixels of each pixel are arranged in a stripe pattern; the long side direction of the stripe of the R, G, and B sub-pixels is the column direction of the pixels of the LCD light valve, and the column direction of the pixels is parallel to the x-axis or the y-axis.

[0012] Among the R, G, and B sub-pixels of each pixel of the LCD light valve, the R sub-pixel is in the middle, and the G and B sub-pixels are located on both sides of the R sub-pixel; the arrangement order of the R, G, and B sub-pixels of each pixel is the same.

[0013] Further, the projection light source uses a three-primary-color LED light source, which is composed of an R chip group that emits red light, a G chip group that emits green light, and a B chip group that emits blue light; each of the R chip group, the G chip group, and the B chip group is composed of one or more columns of chips arranged closely; the direction of the long side of the R chip group, the G chip group, and the B chip group is the direction of the columns of the R chip group, the G chip group, and the B chip group, and the direction of the columns of the R chip group, the G chip group, and the B chip group is the same as the direction of the columns of the LCD light valve pixels.

[0014] The R chip group of the projection light source is arranged in the middle, and the G chip group and the B chip group are arranged on both sides of the R chip group.

[0015] The projection light source and the LCD light valve have the same xyz coordinate system and the z axes coincide; when looking into the direction of the projection light source from the exit surface of the collimating lens, the arrangement order of the R chip group, the G chip group, and the B chip group is opposite to the arrangement order of the R, G, and B sub-pixels of the LCD light valve.

[0016] Optionally, the projection light source uses a white LED light source or a white light source mixed with laser, and the active color separation illumination LCD projector further includes a grating disposed between the incident polarizer and the dichroic mirror.

[0017] Further, the dichroic mirror is a column group of cylindrical mirrors, the number of sub-cylindrical mirrors in the column group of cylindrical mirrors is equal to the number of columns of pixels of the LCD light valve, each column of pixels of the LCD light valve corresponds to a column of sub-cylindrical mirrors, and the central axis of each column of sub-cylindrical mirrors is opposite to the midline of the light-transmitting window of the black matrix opposite to the red color filter; the column group of cylindrical mirrors is attached to the incident surface of the LCD light valve; each column of sub-cylindrical mirrors is a single-sided cylindrical mirror or a double-sided cylindrical mirror.

[0018] Optionally, or the dichroic mirror is an array lens, the number of rows and columns of the array lens are respectively equal to the number of rows and columns of pixels of the LCD light valve; the center of each sub-lens of the array lens is opposite to the center of the light-transmitting window of the black matrix opposite to the red color filter; the array lens is attached to the incident surface of the LCD light valve.

[0019] Further, the color combining mirror is a column group of cylindrical mirrors, the number of sub-cylindrical mirrors in the column group of cylindrical mirrors is equal to the number of columns of pixels of the LCD light valve, each column of pixels of the LCD light valve corresponds to a column of sub-cylindrical mirrors, and the central axis of each column of sub-cylindrical mirrors is opposite to the midline of the light-transmitting window of the black matrix opposite to the red color filter; the column group of cylindrical mirrors is attached to the exit surface of the LCD light valve; each column of sub-cylindrical mirrors is a single-sided cylindrical mirror or a double-sided cylindrical mirror.

[0020] Optionally, or the dichroic mirror is an array lens, the number of rows and columns of the array lens being equal to the number of rows and columns of the pixels of the LCD light valve respectively; the center of each sub-lens of the array lens being opposite to the center of the light-transmitting window of each black matrix opposite to the red color filter; the array lens being attached to the light-emitting surface of the LCD light valve.

[0021] Further, the condenser adopts any one of a single free-form surface lens, a lens combination, a square pyramid condenser or a CPC (compound parabolic concentrator) condenser.

[0022] Further, the collimating lens adopts any one or a combination of any several of a Fresnel lens, a plano-convex lens, a biconvex lens or a concavo-convex lens.

[0023] Optionally, the grating is a blazed grating or a volume grating.

[0024] Advantages of the present invention:

[0025] In the present invention, the RGB three primary color lights of the projection light source are respectively irradiated on the RR, GR, and BR of the LCD light valve, so that the light ≥2 / 3 originally blocked by the CF corresponding part and the light blocked by the BM corresponding part can pass through the R, G, and B sub-pixels as much as possible or even completely, fundamentally improving the transmittance of the LCD light valve, increasing the total efficiency of the CF and BM of the LCD light valve from 12%-21% to above 60%-80%, and increasing the efficiency of the TFT from 40%-70% to above 60%-80%. Thus, the efficiency of the optical system is revolutionarily improved, the heat absorption of the LCD light valve is revolutionarily reduced, the output brightness is increased by an order of magnitude, the energy consumption of the projector is greatly reduced, and it is also fundamentally helpful to improve the color gamut range and white balance of the projected image. The present invention is a meaningful innovation and technological breakthrough for improving the inherent performance deficiencies and application limitations of single-LCD projectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0028] Figure 2 For Figure 1 and Figure 4 is an enlarged schematic view of part A;

[0029] Figure 3 Schematic diagram of the RGB arrangement of the projection light source and the LCD light valve of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the second embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the structure of the third embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the principle of the prior art;

[0033] Figure 7 is Figure 6 Schematic diagram of Lns in

[0034] Explanation of the above-mentioned reference numerals:

[0035] 1 Projection light source, 101 B wafer group, 102 R wafer group, 103 G wafer group, 2 Condenser, 3 Collimating lens, 4 Incident polarizer, 5 Dichroic mirror, 6 LCD light valve, 61 Incident glass, 611 Color film, 6111 Green color filter, 6112 Red color filter, 6113 Blue color filter, 612 Black matrix, 62 Liquid crystal layer, 63 Exit glass, 631 Thin film transistor, 7 Color combining mirror, 8 Exit polarizer, 9 Field lens, 10 Projection lens, 11 Grating.

[0036] Explanation of the symbols in the above-mentioned drawings:

[0037] R represents red light; G represents green light; B represents blue light; W represents white light. Detailed implementation manners

[0038] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description of this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention.

[0039] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0042] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] Embodiment 1:

[0044] See Figures 1-3 As shown, an active color separation illumination LCD projector provided in this embodiment includes a projection light source 1, a condenser 2, a collimating lens 3, an incident polarizer 4, a dichroic mirror 5, an LCD light valve 6, a color combining mirror 7, an exit polarizer 8, a field lens 9, and a projection lens 10 arranged in sequence according to the light traveling direction.

[0045] The LCD light valve 6 mainly includes an incident glass 61, a liquid crystal layer 62, and an exit glass 63; a color film 611 and a black matrix 612 are made on the incident glass 61, and a thin film transistor 631 array is made on the exit glass 63.

[0046] In this embodiment, the projection light source 1 adopts a three-primary-color RGB LED light source, which is composed of an R wafer group 102, a G wafer group 103, and a B wafer group 101. See Figure 3It is not difficult to see that in this embodiment, after the three primary color light-emitting LED light source and the LCD light valve 6 define the same xyz coordinate system, the arrangement order of the R, G, and B wafer groups (in the +x-axis direction, they are G, R, B respectively) is opposite to the arrangement order of the R, G, and B sub-pixels of the LCD light valve 6 (in the +x-axis direction, they are B, R, G respectively).

[0047] See Figure 2 , both the dichroic mirror 5 and the dichroic combiner 7 are selected as a column group of cylindrical lenses, and the sub-cylindrical lenses are all selected with a plano-convex structure and are respectively attached to the incident and exit surfaces of the LCD light valve 6. Among them: the number of sub-cylindrical lenses in the column group of cylindrical lenses is equal to the number of columns of pixels of the LCD light valve 6, and each column of pixels corresponds to a column of sub-cylindrical lenses, and the central axis of each column of sub-cylindrical lenses is opposite to the midline of the light-transmitting window of the black matrix 612 opposite to the red color filter 6112 in each column.

[0048] Continue to see Figures 1-3 , since the R wafer group 102, G wafer group 103, and B wafer group 101 of the projection light source 1 are not spatially coincident, and when looking into the projection light source 1 from the collimating lens 3, the arrangement order of the RGB wafer groups is opposite to the arrangement order of the RGB sub-pixels of the LCD light valve 6. Therefore, the R, G, and B primary color light rays will surely irradiate the dichroic mirror 5 at different angles, and the R light rays are converged by a sub-cylindrical lens of the dichroic mirror 5 and irradiate on the column corresponding to the red color filter 6112 of the LCD light valve 6, and do not irradiate on the columns corresponding to the green color filter 6111 and blue color filter 6113 on both sides of the red color filter 6112; similarly, the G light rays are converged by the sub-cylindrical lens and irradiate on the column corresponding to the green color filter 6111, and do not irradiate on the columns corresponding to the red color filter 6112 and blue color filter 6113; and the B light rays are converged by the sub-cylindrical lens and irradiate on the column corresponding to the blue color filter 6113, and do not irradiate on the columns corresponding to the red color filter 6112 and green color filter 6111.

[0049] In this way, the blocking of about 2 / 3 of the illumination light by the CF of the LCD light valve 6 no longer exists (the absorption of red light by RR, the absorption of green light by GR, and the absorption of blue light by BR are negligible compared to the 2 / 3 blocking), and the blocking of the illumination light by the BM will also be halved (if an array lens is used for the dichroic mirror 5, the "halved" blocking can be completely removed), thus revolutionarily improving the transmittance of the LCD light valve.

[0050] The condenser 2 and the collimating lens 3 are respectively realized by using a single free-form plano-convex lens.

[0051] See Figure 3, for each primary color of the projection light source 1, 4 chips with a size of 1.2mm x 1.5mm are closely arranged in series of 4. Each series of primary color chips is driven independently, which is convenient for separately adjusting the luminous flux of RGB, so that the projector image can obtain perfect white balance; the total luminous flux of the 12 chips is about 21π or so, the main peaks of the RGB three primary colors are about 630nm, 530nm and 445nm respectively, and the luminous fluxes of RGB are roughly in the ratio of 0.3∶1∶0.12. The output luminous flux of the projection light source 1 is about 7000Lm (the total power of the light source is about 80 watts).

[0052] The LCD light valve 6 selects a 4.46-inch HD light valve, with a color gamut of 45% and a natural light transmittance of about 5.52%.

[0053] On the incident surface of the dichroic mirror 5, the Fno (aperture) of the light is about 8. After passing through the dichroic mirror 7, the Fno is about 3.06. For the projection lens 10 of this embodiment, it is achieved very simply and inexpensively. The combined efficiency of the condenser 2 and the collimating lens 3 is about 75%, the combined efficiency of the incident polarizer 4 and the exit polarizer 8 is about 42%, and the efficiency of the field lens 9 is about 92%. The projector of this embodiment can output a luminous flux of up to 1000Lm, which is an index that a traditional single LCD projector simply cannot achieve. At the same time, the color gamut of the projector image is extended to more than 75%-80%. By finely adjusting the current of each chip group of R, G, and B of the projection light source 1, the image can obtain a nearly perfect white balance.

[0054] Embodiment 2:

[0055] See Figure 4 As shown, the projection light source 1 of this embodiment uses a white LED light source, and 15 chips with a size of 43mil are closely arranged in 5 series and 3 parallel to form a white light source. The light spread is still controlled at about 21π or so, and Lambertian light with an output of about 13500K / 3000Lm (power about 30 watts) is output.

[0056] The grating 11 is a volume grating (volume phase holographic grating). When the white light emitted by the collimating lens 3 passes through the grating 11, because the R, G, and B components in the white light have significant wavelength differences, the grating 11 produces different refractions on the light rays of each wavelength. Therefore, the dichroic mirror 3 can refract the R, G, and B light rays with different irradiation distribution angles to irradiate the corresponding R, G, and B sub-pixels of the LCD light valve 6 respectively, thereby reducing or avoiding the blocking of the light by the CF and BM of the LCD light valve 6 and improving the transmission efficiency of the LCD light valve 6.

[0057] To obtain higher efficiency for the grating 11, the parameters of the projection light source 1, the condenser 2, and the collimating lens 3 need to be strictly matched with it, and finally matched with the dichroic mirror 5 and the LCD light valve 6; the dichroic mirror 7 is matched with the projection lens 10 and the dichroic mirror 5 to obtain the highest possible optical system efficiency.

[0058] For the condenser 2, collimating lens 3, incident polarizer 4, dichroic mirror 5, LCD light valve 6, color combiner 7, exit polarizer 8, field lens 9, projection lens 10, etc., refer to Embodiment 1. Finally, the projector outputs a luminous flux of up to 250 Lm, which is impossible to achieve in the prior art (the prior art output ≤ 100 Lm).

[0059] Embodiment 3:

[0060] See Figure 5 As shown, the grating 11 uses a blazed grating. For the rest of the projection light source 1, the illumination f-number, dichroic mirror 5, LCD light valve 6, color combiner 7, and projection lens 10, etc., all refer to Embodiment 2. The projector can output a luminous flux of 270 Lm. Since the power of the projection light source 1 is only 30 watts, it has very obvious positive significance for the heat dissipation, noise, durability, cost, etc. of the projector.

[0061] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0062] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above examples is only used to help understand the method and its core idea of the present invention. The above is only the preferred implementation manner of the present invention. It should be pointed out that due to the limited nature of written expression and the objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of the present invention.

Claims

1. An LCD projector with active color separation illumination, characterized in that, It includes a projection light source (1), a condenser (2), a collimating lens (3), an incident polarizer (4), a dichroic mirror (5), an LCD light valve (6), a color combiner (7), an exit polarizer (8), a field lens (9) and a projection lens (10) arranged in sequence along the light traveling direction; The LCD light valve (6) adopts a full-color transmissive structure, mainly including an incident glass (61), a liquid crystal layer (62) and an exit glass (63) which are stacked in sequence; a color film (611) and a black matrix (612) are made on the incident glass (61); a thin film transistor (631) array is made on the exit glass (63); the color film (611) is composed of a filter array of three primary color filter elements, namely a red color resistor (6112), a green color resistor (6111) and a blue color resistor (6113); each pixel of the thin film transistor (631) array is composed of R, G, B three primary color sub-pixels; the filter array of three primary color filter elements of the color film (611), the light transmission window array of the black matrix (612) and the light transmission window arrays of R, G, B three primary color sub-pixels of each pixel of the thin film transistor (631) array are in one-to-one correspondence; a bisector of a group of parallel sides of the light transmission surface of the LCD light valve (6) is the x-axis, a bisector of the other group of parallel sides is the y-axis, the intersection of the x-axis and the y-axis is the optical center of the LCD light valve (6), and an optical axis perpendicular to the xy plane passing through the optical center is the z-axis; The pixels of the LCD light valve (6) are arranged in a strip shape, and the R, G, B sub-pixels of each pixel are arranged in a strip shape; the long side direction of the strip of the R, G, B sub-pixels is the column direction of the LCD light valve pixels, and the column direction of the pixels is parallel to the x-axis or the y-axis; Among the R, G, B sub-pixels of each pixel of the LCD light valve (6), the R sub-pixel is in the middle, and the G and B sub-pixels are located on both sides of the R sub-pixel; the arrangement order of the R, G, B sub-pixels of each pixel is the same; The dichroic mirror (5) is a group of cylindrical mirror arrays, the number of sub-cylindrical mirrors in the group of cylindrical mirror arrays is equal to the number of columns of the pixels of the LCD light valve (6), each column of pixels of the LCD light valve (6) corresponds to a column of sub-cylindrical mirrors, and the central axis of each column of sub-cylindrical mirrors is opposite to the midline of the light transmission window of each column of black matrix (612) opposite to the red color resistor (6112); the group of cylindrical mirror arrays is attached to the incident surface of the LCD light valve (6); each column of sub-cylindrical mirrors is a single-sided cylindrical mirror or a double-sided cylindrical mirror; Or the dichroic mirror (5) is an array lens, the number of rows and columns of the array lens are respectively equal to the number of rows and columns of the pixels of the LCD light valve (6); the center of each sub-lens of the array lens is opposite to the center of each light transmission window of the black matrix (612) opposite to the red color resistor (6112); the array lens is attached to the incident surface of the LCD light valve (6); The RGB three primary color light rays of the projection light source are respectively irradiated on the red color resistor, green color resistor and blue color resistor of the LCD light valve.

2. The LCD projector with active color separation lighting according to claim 1, wherein The projection light source (1) uses a three-primary-color LED light source, which is composed of an R chip group (102) that emits red light, a G chip group (103) that emits green light, and a B chip group (101) that emits blue light; the R chip group (102), G chip group (103), and B chip group (101) are each composed of one or more columns of chips arranged closely; the direction of the long side of the R chip group (102), G chip group (103), and B chip group (101) is the direction of the columns of the R chip group (102), G chip group (103), and B chip group (101), and the direction of the columns of the R chip group (102), G chip group (103), and B chip group (101) is the same as the direction of the columns of the pixels of the LCD light valve (6); The R chip group (102) of the projection light source (1) is arranged in the middle, and the G chip group (103) and B chip group (101) are arranged on both sides of the R chip group (102); The projection light source (1) and the LCD light valve (6) have the same xyz coordinate system and the z axes coincide; when looking into the direction of the projection light source (1) from the exit surface of the collimating lens (3), the arrangement order of the R chip group (102), G chip group (103), and B chip group (101) is opposite to the arrangement order of the R, G, and B sub-pixels of the LCD light valve (6).

3. An LCD projector with active color separation illumination according to claim 1, characterized in that, The projection light source (1) uses a white LED light source or a white light source mixed with laser, and the active color separation illumination LCD projector further includes a grating (11) disposed between the incident polarizing plate (4) and the dichroic mirror (5).

4. An LCD projector with active color separation illumination according to claim 1, characterized in that, The color combining mirror (7) is a column group of cylindrical lenses, and the number of sub-cylindrical lenses in the column group of cylindrical lenses is equal to the number of columns of the pixels of the LCD light valve (6). Each column of pixels of the LCD light valve (6) corresponds to a column of sub-cylindrical lenses, and the central axis of each column of sub-cylindrical lenses is opposite to the midline of the light-transmitting window of each column of black matrix (612) opposite to the red color filter (6112); the column group of cylindrical lenses is attached to the exit surface of the LCD light valve (6); each column of sub-cylindrical lenses is a single-sided cylindrical lens or a double-sided cylindrical lens; Or the color combining mirror (7) is an array lens, and the number of rows and columns of the array lens is equal to the number of rows and columns of the pixels of the LCD light valve (6) respectively; the center of each sub-lens of the array lens is opposite to the center of the light-transmitting window of each black matrix (612) opposite to the red color filter (6112); the array lens is attached to the exit surface of the LCD light valve (6).

5. An LCD projector with active color separation illumination according to claim 1, characterized in that, The condenser (2) uses any one of a single free-form surface lens, a lens combination, a square conical condenser, or a CPC condenser.

6. An LCD projector with active color separation illumination according to claim 1, characterized in that, The collimating lens (3) uses any one of a Fresnel lens, a plano-convex lens, a biconvex lens, or a concave-convex lens or a combination of any several of them.

7. The LCD projector with active color separation illumination according to claim 3, wherein The grating (11) is a blazed grating or a volume grating.

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