TW470853B - Full color image display projection system - Google Patents

Abstract

A projection system for full colour image display, comprising: (a) one light source and an illumination optical system to direct and collimate the white light beam (b) a polarizing beam splitter having a non-cubic shape to reflect a particular polarization of the input light as described in 1a (c) a trichroic prism assembly used to separate the three primary colours from the white light beam and directs them to the three reflective light valves respectively (d) a plurality of reflective polarization modulating light valves, each producing the corresponding colour image signal (e) the same trichroic prism assembly as described in 1c which will be used to recombine the reflected light beams (f) the same polarizing beam splitter in 1b which will be used to direct the light beam either back to the light source or to the screen depending on the polarization change imparted by the reflective light valves (g) a projective lens system to image the light onto a screen and to form a full colour image.

Description

470853 said—Amendment 89105417 V. Description of the invention (1) — ^ [Scope of the invention] The present invention relates to a projection system for full-color images, and in particular, to a small and high-efficiency three-color 稜鏡 component (Tp A ), And about a polarizing beam splitter (PBS). The TPA and PBS are placed between the objective lens and the LCI panel or other types of reflective light valves to form a small projection system. [Background of the Invention] The conventional projection display mainly uses a transmissive light valve, such as an active moment = LCD panel. ^ On the other hand, reflective light valves offer many advantages, such as countersunk mirror ratio, high light efficiency, and high projection image quality. At present, large-scale projection systems based on reflective liquid crystal light valves (LCLV) have been developed and manufactured on the market. Recently, a silicon reflective CMOS liquid crystal light valve has also been introduced. These products offer many additional advantages, such as the ability to fully integrate the CDY circuit into the chip, and the economics of mass manufacturing. However, this new type of light valve desperately requires a compact optical system. In the F and F reflective projector systems, the collimated light source is first divided into three main primary colors by two two-color filters (usually having a first blue filter and a second red filter). These beams then follow different light paths: the guides illuminate the corresponding light valves. These inverted beams with changed polarization characteristics are then recombined using a two-color filter. These filters can be the same set of dichroic filters or different dichroic filters. The incident light is separated into reflected light by PBS and then projected on the screen. U.S. Patent "δ · Ρ · NO · 4,687,301 discloses a color separation-recombination optical group. The text is not used in the specific refractive index indicator fluid (color matching state in the index matching fluid is used in color separation and recombination processing. Blue 47〇853-Case No. _8jl05417 ___ month day correction _________ a I. Description of the invention (2)! The incident angle in the I filter is 24 °, and the red filter is 1 2 ... | US Patent USP No. 4,969, 730 discloses a 3 -prism component, which is A well-known color separation device. This device can be used as both a color separator and a color recombiner. The principle of this patent is the same as that of us P, No. 4, 9 6 9, 73 1 |, but it improves the simplicity of manufacture The blue filter and the red filter 1 are coated on the surface of the tadpole. The incident angle is all 30. ° PBS is also used to separate the polarized modulated reflected beam into incident light. I USP · Νο · 5,644 432 A projection system is disclosed in which the dichroic filter and the recombiner compose the same 3-稜鏡 component. PBS is used to separate incident light and reflected light. In this case, there will be no air gap in the blue filter | , So 3 tadpoles can be glued together. Blue and red two-color wave wave appliances Large angle of incidence angle of 30 to maintain the short return distance of the projection lens; working distance. [Objective and Overview of the Invention] 1 The optical system of a full-color reflective LCLV projector must have the following characteristics: (1) Large output luminous flux 'It represents the optical stability of a large system, or a system with LCLV, (2) the use of dual polarization' (3) high-precision color separation and recombination, which is independent of polarization, and (4) slight Or the return distance of a small projection lens; focal length (retrofocus). The color separation disclosed by the conventional technology is not in line with the above characteristics. Therefore, the object of the present invention is to provide two-two; Color separation and recombination at small incident angles. According to the first aspect of the present invention, a polarization beam splitter with a non-cubic chirped structure is provided. The two-color coating or filter can maintain a small value. : Beam angle. This beam splitter can be irregular quadrangular or trapezoidal. 470853 V. Description of the invention (3) _ # ^ _ 891〇5417 Modified in accordance with the first of the present invention can provide a full-color projection gg one of u 'contains suitable for separations Sombroke ’s several reflective light valves. The polar lens and the prism assembly can be trichromatic. To illustrate the principle of the present invention, it can provide-the color of the incident light can be maintained as much as possible. u The reason for the difficulty of changing the knife. The dielectric multilayer optical frost used to form the two-colored hues—the winter old age such as α > Youba filter Ώ c, Let ι include a periodic high reflection coefficient drawer Γίη and a low reflection coefficient layer (L). For nHdH = nLdL = again / 4, now (η) light system is shown as the following formula: ° Reflection • sin "

H where AAR is the bandwidth of the reflected light, ^ and effective admittances ^ and ^, respectively. T? H and "l are functions of the body, angle, and state of light polarization. For s-polarization, β is = ^, 1 ', and for ρ-polarization, π ip = π i / c0s 0 i. Here, or L \ and 0 i is the refraction angle of each film. The relationship between Θ i and the incident angle Θ! is given as npSini9 nisin < 9i. ', the following will refer to the drawing It will be described in detail by using the principle components of the present invention and the non-polarizing beam splitter. Wen Xiong [Explanation of the invention] The effective admittance of the diaphragm 7 / will change with the incident angle 0. When the incident angle increases, The difference between the reflection spectrum of P-polarized light and the second one is greatly affected. Therefore, 'a large incident angle will lead to a larger difference between the spectral reflection band of S-polarized light and p-polarized light. . Figure 1 shows the red edge filter 470853 ^--__ Case No. 891j5417 ___ day correction "7 # ^ 明 ⑷ '—!! ·! | | Spectral reflectance of the device and blue edge filter, wave filter. These coating systems It is used in the three-color 稜鏡 module which uses 丨 | to separate the three primary colors of red, green, and blue. In the calculation, (a) 16 °, (b) 30 °, and (c) 45. (Figure 1!). The solid curve pattern refers to p-polarized light, while the dashed curve is s-polarized: | light. Suppose the coating is between air and glass (ng = l · 51 63) I 丨 Figure 1 clearly shows that when the incident angle is increased, the difference between the s- and p ~ polarized light reflection spectrum becomes larger. This is because the reflection light valve system is adjusted according to the polarization | The change in reflectivity with polarization changes is represented by the loss of the reflected signal on the projection screen, and the shift of color coordinates and the loss of color authenticity. The 45 ° curve (c) is equivalent to X- Cube color separator or heavy: the condition of the combiner. Obviously, X-cube cannot be used as a color separator and color recombiner at the same time. On the other hand, 16. (a) the angle of incidence is acceptable (such as (Shown in Figure 1). This is the angle of incidence implemented by the present invention. Figure 2 shows a preferred embodiment of the present invention. This is a projection system using a reflective light valve. Three light valves 13, 14, 15 respectively Used in the three primary colors of red / green 丨: and blue. The light source 22 first passes through the reflector and lens of the light source itself Collimate and correct by combining 19 and 21. Then, the light beam enters this embodiment; the non-cubic parallelogram PBS17. The coating of the inner surface 17b of PBS can transmit P-polarized light and s-polarize Light reflection. Then, p-polarized reflection; light enters the three-color 稜鏡 module 10,11,12. Figure 3 shows the detailed structure of the three-color 稜鏡 module with three 稜鏡. 稜鏡; 10 (No incident surface 10a perpendicular to the optical axis) usually has an angle of 90 ° to 010 with respect to the optical axis. This can make the incident angle of the surface 10b small. 1. The first two-color coating is applied on the surface 1Qb of 稜鏡 1〇. This coating is used to reverse the primary primary color one. In one embodiment, blue light must be reflected. 470853 7 ^ month day correction

5. Description of the invention (5)-In other embodiments, red light must be reflected. One important point is that the shape of the reflection | must illuminate the surface 10a at an angle | that is greater than the critical angle of the total internally reflected light in 稜鏡. The internal total reflection light then exits the surface 10c in a vertical manner I and enters the reflection light valve 13. The reflected light i from the light valve 13 is modulated by polarization. The reflected light passes through the same path and shines on the surface of the PBS; surface coating 17b. The light will depend on the action of the light valve 13 and may be reflected back to the source of light i 丨 or transmitted and projected on the screen. Therefore, the light valve can generate the image on the screen by adjusting the polarization. On the surface 10b, the transmitted light enters the prism 11 and irradiates the surface 1b. This surface is coated with a two-color filter, so that one color element (usually red) is reflected and guided into the air gap 113. The angle of incidence of the light in the air gap can cause internal total reflection. The internal total reflection light is transmitted to the light valve 5. The exit surface 11 C is almost perpendicular to the light beam. The reflective light valve will modulate the polarities of the light beam. Once the original light path is reflected and traced back, this modulated light will illuminate the surface r7b of the PBS :. This light beam is then reflected or transmitted in accordance with the action of the light valve for projection.丨 The last color element (usually green) of light will pass through 稜鏡 12, and; point to light valve 14. The reflected light from the light valve 14 will be traced back to the main optical axis. Like other colors, this reflected light is also imaged on the screen according to the polarization modulation of the light valve 14. All the air gaps / glasses 10a, 10c, lla, llc and 稜鏡 12: the injection surfaces are coated with AR coating. The AR coatings on the 11a and 10a surfaces are special 丨 Bandwidth AR coatings. The phases caused by the two-color coating must be considered: changes and internal total reflection. There are also air gaps between prism 10 and prism 11 and between 稜鏡 10 and PBS17. These gases are required for internal total reflection. 470853 i___ (Amendment No. 89105417) V. Description of the invention (6) Gap. Alternatively (in another embodiment), special coatings can be used to generate reflections of different color elements without using air gaps. These three angles are very important. It reduces the angle of incidence and produces internal total reflection. Therefore, let the two-color coatings (丨 两个 and 丨 丨 乜) have the same non-incident angle, and 4 is shown as < 9. Then we can simply use the following equations to express Table 1 -NA δ >-sin " (2) where η is the refractive index of 稜鏡 and NA is the aperture ratio of the projection system. Therefore, if the refractive index of 稜鏡 is 1.52 and the value of the system F is 3.5, then from Equation (2), 0 of 16 can be found. This is the smallest angle possible. If the two-color filter is allowed to have different angles of incidence ', then different values can be obtained. Other angles of the prism assembly obtained from these equations are: 02 = 32. ’0 3 = 74. . In addition, for internal total reflection in 稜鏡 1〇, 0 1 must be satisfied.

I + ^ > sinH " (3) 丨 If 0 1 is set to 32, the angle of 稜鏡 10 and prism 丨 丨 will be equal. This makes the fabrication of the rhenium component easier. The size of the chirp will be determined by the size of the reflective light valve and the path length of the three-color beam inside the chirp assembly. It must be noted that the angle of incidence also depends on the refractive index of the edge =. If high refractive index chirp is used, the angle of incidence of the two-color main cover is reduced. 470853 Date: Revised tE 8910 ^ 417 V. Description of the invention (7) In this embodiment, the two-color coverage is extremely helpful for mass production. ", =: 角 个 " is very small. In addition," 』月 疋 /%. The effect of polarization on the reflection spectrum i" The angle of incidence also reduces the reflectance for different incidences & dependence. A large two-color coating acceptance angle indicates that the prismatic configuration can increase the numerical aperture of the entire optical system. Text, brother ~ Figure 4 shows a non-cubic polarization beam splitter. pbs with the same right angle, and both are coated with arJ ?? surface 108 and 17 & two BK7 glass, so that the material of the embodiment of the towel _ _7 and should have a high polarization effect. It has low tension and high transmittance at the wavelength for transmission. With the detailed description of the present invention and the accompanying drawings, a full color projector is provided, which uses a reflective light valve. This subsystem includes AJ polarized beam splitter with three-color chirp components, which can be used as the three primary color splitters and color recombination. Ichishima 〃, ', ❼ are used. The two-color 稜鏡 component contains two dual-filter coatings, which can separate the three primary colors of the incident light (ie, red, green, and blue 2 into three corresponding channels. The two two-color coating systems are located at the edges, It is optimized to have a small incident angle and low polarization dependence. It uses the same three-color element for color reorganization. These three waves are polarized using a reflective light valve. Modulation. Although the first beam has different polarization, basically the beam traces back along the original optical path and passes the same two-color filter. The two-color filter has no correlation to the polarization 0

470853 -----— Run— Year ___ ^ ___ ^ Amendment V. Description of the Invention (8) I — ~~ Π In order to maintain the small incident angle of the two-color filter of the three-color 稜鏡 component, non-cubic is provided A polarizing beam splitter (PBS). With the parallel quadrilateral shape of pBS, the small incident angle of the two-color filter can be maintained. | Therefore, the present invention provides an optical component of a reflective light valve. | The existing liquid crystal (LCD) projection display is mainly based on a transmissive light valve: as an image generator. The disadvantage of this LCD projector is the aperture ratio of the LCD panel: (AR) is very small. As the resolution of the light valve increases, the aperture ratio becomes smaller | For example, the AR of an SVGA display is about 0.67, while that of an XGA LCD is about 丨: 0.5. In addition to low light efficiency, low AR also requires a black matrix (; Matrix) to mask the transistors used to generate pixels. Therefore, it is necessary to go to the figure; ^ processing (Depixelization), which increases the complexity of the optical system design:. In this type of transmissive projector, different sets of color splitters are used to separate the incident light into the three primary colors and recombine them after passing through the light valve. Color recombination processing is usually performed in χ-cubic (χ-). ′; J Reflective wonderful crystal CM0S liquid crystal light valve can overcome the low AR problem of the conventional transmissive LCD panel. Regardless of the resolution, this silicon crystal CD ... [CD ar can be as high as 92%. This is because the transistor can be hidden under the pixel's mirror.

| As a result, the light efficiency and the quality of the projected image can be greatly improved. I! Projection optics for reflective light valves are more complex than transmissive. There is one; i factor is because the change of 3 and 1) polarization in the optical path must be considered. Full-color projectors can be used or they can have three primary colors simultaneously. This projector usually requires arc light) to be separated into several main primary colors, a timing type of the reflective LCD panel 3-panel type. The present invention is directed to the latter method for transmitting incident white light sources (usually optical subsystems, and

Page 11 470853 ~ ___ Case No. 89105417 Amendment in January —————— ～ ———-------- | V. Description of the invention (9) —η: |; To reconstruct another optical subsystem of these three primary colors. The color and color recombiners can be the same optical element, or they can be different optical elements. For small projection systems, the latter is better.丨 I There are many optical components of reflective light valves based on color projectors.

! Same design. The basic element of a reflective light valve is a polarizing beam splitter (PBS |), which can reflect an s-polarized beam and transmit a p-polarized beam. In the upright design, three PBS are used for the three primary color panels. The color separator and color recombiner can be set up in separate filters like the transmissive projector. Figure 5 shows the basic settings. The two-color reflector is used to reflect red and blue light. The R, B, and G channels are transmitted to three PBSs and three light valves. The image is then modulated. The reflected light is sent to a color reconstruction X-prism for projection. Because the reflective coating in X-prisms is most suitable for s-polarized light, half-wave plates are usually required for red and blue light channels to rotate polarized light of reflective LCDs. Therefore, this system is very complicated. In addition, for small color projectors using reflective light valves, color separation and color reorganization should be completed with the same set of optical coatings. A common optical component used to accomplish this task is the so-called Philips prism. This tri-color tritium component (TPA) system; works in concert with a single PBS to form the core of a small color reflective projector. This system is shown in FIG. 6. : PBS first transmits ρ- or s-polarized light to TPA or ρ-polarized treatment. 1 The choice is based on the position of the arc light and the projector lens. In TP Α: The first two prisms are 30 ° °. The exit surface is coated to separate red from blue. The air gap shown in the figure encourages internal total reflection to divert red and blue reflections from their path.

Page 12 νϋ853 ~ — i Mutual, Invention Description (10) —:

I _ I i two color channels exit the TPA and illuminate the reflective LCD light valve. Line |

The action of the | like liquid crystal is used to control the polarization of the reflected light. LCD panel design I | There are many optical modes. In all cases, when a pixel I is selected, the reflected light must be polarized and rotated by 90 °. And its beam will trace back to the same light of incident light and pass through the PBS. : Therefore, the high reflectance coating of both blue and red light must be used for both s- 丨 and P-polarized light. This is a very difficult requirement for coating design. As is well known, unless the angle of incidence is zero. Otherwise, the two-color coating cannot be without polarization dependence. Due to the internal total reflection of red and blue light, the incident angle of the blue and red filter surfaces is limited to at least 30 °. Therefore, the conventional TPA has extremely severe polarization dependence in its reflectance spectrum. This so-called S_P polarization beam splitting will cause serious loss of light efficiency and loss of color authenticity during display. ! Figure 7 shows the red and blue coatings for three different angles of incidence 16. | 30 to Friends 45. Reflectance spectrum. Red light and blue light edge filter spectra; they are plotted in the same diagram to represent 3-color-separation. Solid line curve: The line refers to P-polarized light, while the dotted curve indicates s-polarized light. It is assumed that the coating is between glass having a dielectric coefficient of 15163. It can be clearly seen:; Out: When the angle of incidence increases, the spectral resolution between ’S- and P-polarization will increase greatly. π π 1: i! This so-called s-p polarization separation causes a loss of reflected optical density. It will also cause a deviation in the color coordination of the separated light and the recombined light. The object of the present invention is to solve this disadvantage. The optically-coated s-p polarization separation system is derived from the following factors: s- and p: pole specific admittance is different. Light admittance is the angle of incidence and pole of light 470853 Case No. One by one?-One by one ________ ____ — ~-one! V. Description of the invention (11) Function of the state of transformation. It is: η is-ni cos Θ for s-polarization and Lu (4)! \ And i \ for p-polarization (5) I is in equations (4) and (5), the subscript i Represents the i-th layer in a coating stack. ! The effective admittance of the film is changed according to the incident angle of the incident light. And as the incident angle increases, the difference 1 between the S- and p-polarization spectra increases. Therefore, a large incident angle results in a large difference between the reflection spectra of S-polarized light and P-polarized light. As demonstrated in Figure 7. The key to the optimization of the three-color separation / recombination prism is to reduce the incident light angle of the two-color coating. The angle of incidence is limited by the need for total internal reflection of the red and blue channels. Therefore, the present invention is provided with a three-color separation / recombination prism assembly in which the angle of incidence of two-color coating is reduced to 1 β. . In Figure 8, this is not the case. The main principle is that pBS has a non-right-angled shape 'and is different from the conventional cubic shape. This relaxes the conditions of the design 'and allows a smaller angle of incidence. 'Blue high reflectance coating is applied to surface Bc, while red high reflectance is applied to surface CD. The angle of incidence of the two two-color coatings is the same, Part: 1 shot strip: Here: Whisker surface ® (_c) Maintained within (6)

470853 Case No. 89105417. Amendment i. V. Invention Description (12) .sinH ΝΑ ^ > sin- * U- U sin-'M (7) (8) and (9) Therefore \ -sin

+ smU (10) v -t υ y In these equations, η is the refractive index of the 稜鏡 material, and μ is the numerical aperture of the projection system. Therefore, if the refractive index of 稜鏡 is i, 52 and the value of the system F is 4, then the minimum value can be obtained from equation (10); 16 ::. In addition, you can also feel comfortable-16. And 03-74. . Prism; Angle: Small will of course depend on the size of the LCD light valve. Therefore, the present invention provides a very simple prism assembly in which the two color coatings have the same angle of incidence. BCABC is the same as BCD. Small Ϊ is often convenient for mass production. It is clear from Figure 7 that this TPA has a polarizing effect that is acceptable. In addition, the small angle of incidence has: dispersion effect. Therefore, the “* color coating” can have a large value of “accessible angle”; the new structure can improve the _1 rate of the entire optical system and maintain excellent color separation characteristics. When = is used, the known TPA structure and the new TPA structure are compared. The two-color coating used in beans has been optimized & for the separation of red and blue light

Page 15 470853 ____ Case No. 89105417 ______ January! V. Description of the invention (13) These materials were obtained through a PR6 50 spectrometer. Normalize the reflectivity of the coatings for comparison. Xi | The red, green, and blue channels equivalent to TPA have white | s-and ρ-polarized spectra that have shifts. j Blue light shift is nearly 10 nm. i is in the new TP A measurement reflection filter spectrum (incident sound is slightly separated by s-ρ polarization. This result is completely consistent with the spectrum of g-polarized light and ρ-polarized light is very obvious and phase: small It is very useful for color projectors. In short, the small limitation of using reflective LCD light valves is the design of the color separator and color recombiner. The design of P A can significantly improve the s-ρ polarization separation. With the present invention, a single optical dichroic device and a color recombiner can be used, and the angle of incidence with high color coating is preferably about 16 °. The invention and the reflection spectrum have lower properties. Therefore, Can be applied to the color when the polarization is changed: processing. The three-color 稜鏡 component can be used in a small color projector.! Optical spectrum / polarization effect is an optical projection system. Optimized. This is true for: projectors. For anti: optical coating systems are mainly subject to system characteristics. The trichromatic effect is the main factor affecting the efficiency of optical systems. Disadvantages of Enhancing Custom Design , Persons were lost --------------------_____________________________________________ Khan set correction, with the polarization and color of the three known TPA peaks 3 a 3- polarized reflex The rate i is 16 °), and the numerical result of 37 can be ignored. S-same. This TPA is for Figure 6 {Design of Color Projector. By changing conventional problems. Realize the color authenticity in the component group. For two-color s- and ρ-polarization-dependent separation and color reorganization, the two major special reflection mode or transmission mode projectors in the reflective liquid crystal light system, the polarization component of the chirped component. The optical system of the present invention is mainly applicable to the new TPA

Page 16 470853--Amendment No. 89105417 _ _ —— I. Small Projector of Invention Description (14); used in such as desktop monitors and flat-screen televisions.

Page 17 470853 i _______—— ΜΨ, 8910 ^ 4Π_ almost __S_____ only — schematic illustration! [Illustration] I Figure 1 shows the sensitivity of a two-color coating when polarized, and its inverse color spectrum follows The change of the angle of incidence varies as shown in (a), (b), and (C); Figure 2 is a schematic diagram of a general projection system; Figure 3 shows the detailed structure of the color separation / reassembly module; Figure 4 Showing non-cubic polarizing beamsplitters; 丨 Figure 5 shows the optical system of a reflective color projector with an unfamiliar structure; 丨 = 6 ^ Shows the light of a reflective color projection display using a three-color 稜鏡 module Figure 7 series The red and blue edges are coated with the reflection spectrum calculated for the incident angle (a) i ^,) 45, where the solid curve is p-polarized light \ and the dotted curve is 3-polarized light; and Figure 8 It is a new tri-color with new non-cubic m. [Symbols] 10,1151'2 10a, 10b, 10c 11a, 11b, 11c 13, 14, 15 Prism surface surface 17 17a, 17b

Light valve PBS 19, 21 surface 2022 lens lens light source

Claims (1)

470853 6. Scope of patent application 1. A projection system for full-color images, including: a) a light source and an illumination optical system for guiding and collimating the white light beam; b) a non-cubic polarizing beam splitter for To reflect the specific polarization of the input light; c) a three-color chirped component to separate the three primary colors from the white beam and direct them to three reflective light valves; d) a plurality of reflective modulations Polarized light valves, each reflective modulation polarized light valve generates a corresponding color image signal; e) the three-color chirped component is used to reassemble the reflected light beam; f) the polarized beam splitter is based on the reflection The light valve's polarization is changed to direct the light beam back to the light source or to the screen; and g) a projection lens system for imaging light on the screen and forming a full-color image. 2. A projection system for a full-color image as described in item 1 of the patent application range, wherein the polarizing beam splitter may include a right-angle 稜鏡 and a trapezoid 稜鏡, with a polarization coating therebetween. 3. The projection system of item 3 in the scope of patent application, in which the acute angle of the trapezoidal ridge may be 74 ± 53. 04. The projection system of full color image in case of the scope of patent application 1, in which the three-color unit It can contain three ridges, two of which are triangular ridges and the third is trapezoidal ridges. The two-color coating is preferably applied to the surface between the ridges. 5. Projection system for full-color images such as item 4 of the patent application scope, where Page 19 470853 _ —— ____________— M 891 ^ 05417 _______________ Color ........ I .-... say ... H .. 6. Scope of patent application The acute angle of this trapezoidal prism can be 74 to 5 5. 6. For the projection system of a full-color image as described in item 4 of the patent application, the angles of the triangles can be 3 2 ± 5 ^, 4 8 ± 5 °, and 100 ± 5 °, respectively. 7. The projection system for full-color images as described in item 4 of the patent application, wherein the two-color coating preferably has an angle of incidence of 16 ° to 5 °. 8. The projection system for full-color images as described in item 4 of the patent application, wherein the two-color coating on one of the surfaces of the three-color cymbal module can be an edge waver with blue high reflectance and transmission of other colors 9. A projection system for a full-color image, such as item 4 of the scope of patent application, wherein the two-color coating on one surface of the three-color 稜鏡 component can be an edge filter with high red reflectance and other colors. Transmitter. 10. The projection system of a full-color image as described in item 4 of the patent application, wherein the reflectance spectrum of the two-color coating has a spectral shift of less than 5 n in between s-polarization and p-polarization. 1 1. The projection system for full-color images such as item 1 of the scope of patent application, wherein the reflective light valve may be a liquid crystal light valve. 12. For a full-color image projection system such as the item 11 of the patent application scope, wherein the liquid crystal light valve can be a silicon back plate to actively drive the liquid crystal cells. 13. For a projection system of a full-color image as described in item 1 of the scope of patent application, the transmitted light of the polarizing beam splitter can reflect s-polarized light. 14. The projection system of a full-color image as described in item 1 of the patent application range, wherein the transmitted light of the polarized light beam can reflect ρ-polarized light. 15. For a projection system for full-color images, as described in item 1 of the patent application scope, Page 20 470853--Case No. 89105417 Date Modified f ~~ — i Sixth, the scope of patent application I The light source can be input to the polarization beam splitter basically along the main axis of the three-color chirped component. 16. For a projection system for full-color images in the first item of the scope of patent application, the light source in I can be input substantially perpendicular to the main axis of the three-color chirp unit and enter the polarized beam splitter. i 17. The projection system for a full-color image as described in item 4 of the patent application scope, wherein the three-color cymbal assembly may have an air gap between the triangular cymbal assemblies.丨 18. For a projection system for a full-color image as described in the first patent application, wherein the polarizing beam splitter and the three-color 稜鏡 module may be provided between the polarizing beam splitter and the three-color 稜鏡 module Air gap. Page 21