TW201346335A - High efficiency light combination module of projection system - Google Patents

Abstract

A high efficiency light combination module of a projection system comprises a tetragonal main prism as the main body provided with four array lenses, three retardation sheets and three optical plates at the periphery thereof. Using a coating layer capable of reflecting or allowing passage of specific light, light sources of different colors incident from different directions can be integrated to a single illumination light source, and the array lenses can be used to homogenize the single illumination light source, such that a panel or projection lens behind can collect all light beams and project the light uniformly. In addition, a polarizing conversion film can be disposed at the outlet end of the illumination light beam to further integrated non-polarized incident light into polarized light of the same direction for use by a projection system using a liquid crystal panel.

Description

High efficiency light module of projection system

The "high-efficiency light-combining module of the projection system" of the present invention refers to a multi-functional light-combining module that emits light with greater brightness and uniformity when incident with a multi-color light source, and can be used not only for external connection (or Built-in projection system in mobile phones, cameras, and video recorders (DV) can also be used on independent projection systems.

The biggest breakthrough of the general projection system is the problem of insufficient brightness (excessive light loss), especially in the micro-projection system. In addition, the improvement is the precision and cost considerations in the processing process. How to design a kind of It is an optimal projection system design because it is easy to process and has less light loss. It can be used in a stand-alone system or built-in (or externally) for digital electronic products.

For the problem of insufficient brightness of the conventional projection system, the light combining technology of the light source color is mainly used as a common solution. Referring to FIG. 12, it is a schematic diagram of a color combining device of a conventional projection system, comprising a square prism 91 and three light source modules 90; wherein the four corners of the square prism 91 are opposite to each other. In the direction, the connecting forks are respectively connected to form an X-shaped coating film 92 having the ability to reflect or transmit red or green or blue light lines, respectively.

The three sets of light source modules 90 are respectively disposed on three sides of the square prism 91, and each light source module 90 includes a light emitting diode (one of red R, green G, and blue B) and collimation. The lens, when the three groups of light source modules 90 (red R, green G, blue B) light-emitting diode light is collimated into the square prism 91, after the action of the X-shaped coating 92, and then the light-emitting side of the square prism 91 (as indicated by the lower arrow in Figure 10), but this structural design has the following disadvantages:

First, the X-shaped coating is a crossover design with an incident angle of forty-five degrees. The large angle of incidence causes some incident band penetration or reflectance loss, as shown in Figure 13, because the coating is polarized and large. The influence of the angle of incidence angle effect causes the P-polarization curve in the spectral characteristics to be separated from the S-polarization curve, thus causing a part of the light-emitting wavelength section of each light source, such as the coating characteristics of the region C and the region Y due to large-angle incidence. Partially cut off, resulting in loss (generally causing more than 30% of the loss), especially using a wide-band green light source (as in Figure 11, the green light source is produced by a blue LED to stimulate the phosphor) The most serious loss, resulting in insufficient brightness and wasting energy, is the main drawback.

Secondly, in the manufacture of X-shaped coating, the efficiency of coating is not good, and the assembly is time-consuming, and the precision is relatively high, so the cost is increased and the process is complicated, which is another disadvantage.

Furthermore, the conventional micro-projection system is limited by the volume factor, the light combining technique of the light source color, and does not simultaneously handle the illumination light uniformity and the P light (L _p ) and the S light (L) in the polarized light. Separation and conversion of _S ), therefore, half of the polarized light in the projection system using the liquid crystal panel cannot be utilized after entering another polarizing beam splitter (PBS) component, resulting in loss of light, resulting in insufficient brightness. Is another major drawback of the habit.

The main object of the present invention is to have a combination of four array lenses, three retarders and three optical plates on one side of the cylindrical main prism, and to have multi-color rays from two or three. After the direction is injected into the invention, the uniform illumination light can be synthesized after being reflected in the mirror for use in the projection system; if a polarizing conversion film is further added to the light exit end, the emitted light can be further converted into a specific polarized light. It is suitable for the projection system of the liquid crystal panel type, which can not only make the multi-color light source synthesize the illumination light, but also homogenize the illumination light, and the brightness is improved under the same light source module, and the light source is not lost; It is a feature of the present invention that the polarized rays of P and S can be integrated into the same polarized light.

In order for your review board to have a clear understanding of the contents of the present invention, only the following description will be used in conjunction with the drawings, as explained below.

Referring to Figures 1 and 2, the present invention includes at least:

A main prism 10 is a cylindrical body, wherein three sides are defined as light-injecting light entrances or light-reflecting sides 102, 103, 104, and the other side is used as a light source to project a light-emitting side 101, and a square cross-section of the main prism 10 A polarizing beam splitter 20 (ie, PBS) is provided in the cross section between the opposite corners. For convenience of manufacture, please refer to FIG. 2, the main prism 10 can be composed of two prismatic unit prisms 10A, 10B ( For example: triangular prisms are relatively combined.

Four array lenses 30 are respectively disposed on the sides 101, 102, 103, 104 of the main prism 10, and are provided with a plurality of closely arranged lens units 31. The four array lenses 30 can be flat side adjacent prisms 10 as shown in FIG. The sides 101, 102, 103, 104 may also be disposed adjacent to the sides 101, 102, 103, 104 of the prism 10 as shown in Fig. 2A.

When the four array lenses 30 are disposed as the side edges 101, 102, 103, 104 of the flat side adjacent prisms 10 as shown in FIG. 2, in order to consider assembly convenience, as shown in FIG. 10, the unit prisms 10A of the main prism 10 can be Each of the 10Bs is combined with the two array lenses 30, and is injection molded or injection molded (Injection or Molding). Further, as shown in FIG. 2, the two unit prisms 10A, 10B combined with the two array lenses 30 are added to the polarizing beam splitting film 20 and relatively bonded to each other by a bevel, thereby forming the core component of the present invention; It can also effectively reduce costs.

Referring to FIGS. 1 and 2, three retarders 40 (ie, retarders) are respectively disposed on the light-injecting ports projected by the light source of the main prism 10 or the three sides 102, 103, 104 reflected by the light source, and are opposite to the array lens 30. The retarder 40 can interchange the p and s poles in the polarized light of the projected light; in fact, the positions of the three retarders 40 and the array lens 30 in the first, second, and second embodiments. It is interchangeable and does not affect the actual effect.

The retarder 40 described above can be directly formed by a quarter wave phase retarder (Quarter Wave Plate) or other equivalent optical retardation film, and can change the polarization characteristics of the transmitted light. The detailed operation principle and the azimuth alignment condition between the phase retardation axis and the direction of the polarization optical field are professional and well-known techniques, and will not be further described herein.

Three optical plates 61, 62, 63 are respectively disposed on the outer sides of the three retardation plates 40 and the corresponding array lens 30, and one of the three optical plates 61, 62, 63 is respectively provided with one a coating 610, 620, 630 for passing or reflecting specific light; or a side of any one of the optical plates (such as the optical plate 63 on the right side of Figures 1 and 2) as a mirror-like total reflection coating (as in Figures 1 and 2) 630); The above coating 610, 620, 630 is in the form of a coating layer or a film.

The above-mentioned main prism 20 or optical plates 61, 62, 63 are slightly chamfered or rounded at each corner due to safety or other factors, and can be used and utilized without affecting the main light travel. .

The above design constitutes an extremely novel and highly efficient projection system multi-functional light combining module. For further illustrating the practical application of the present invention, the above-mentioned coatings 610, 620, 630 are provided for specific light passing or reflecting configurations, and for polarized light. For the processing, there are a variety of embodiments, and three of the embodiments are described.

First embodiment:

As shown in Figures 1 and 2, the coating 610 of the left optical plate 61 reflects red and blue light, while the green light penetrates; the coating 620 of the upper optical plate 62 reflects green light and red light and blue light penetrates. On the right side of the optical plate 63, a mirror-finished coating 630 is set.

See FIG. 3 shown, if the collimated (Collimated) from the green light L _G (on the left in this figure) perpendicular to the outer optical plate 61 is incident, just for green 610 passes through the penetration coating, And after passing through the optical flat plate 61, the retardation plate 40, and the array lens 30, respectively, the polarizing film 20 of the main prism 10 is touched, wherein the S-polar ray L _{S of the} green light ray L _G (indicated by a solid line, the same applies hereinafter) met polarization splitting film 20 were reflected light 10 to the main prism 101 side, and then emitted through the lens array 30; however, the green light L _G is P-polarized light L _P (shown in dashed lines, hereinafter the same) then Passing through the polarizing film 20, passing through the array lens 30 and encountering the retarder 40 on the right side, and the optical plate 63 behind it, the coating 630 on the side of the optical plate 63 can reflect the green light and combine the characteristics of the retarder 40. The original polarized light is converted into the S pole's polarized light L _S (solid line) and then emitted to the polarizing beam splitting film 20, and then reflected upward through the array lens 30, the retardation plate 40 and the side optical plate 62, by the optical plate 62. reflective coating 620 and the side plate 40 in conjunction with delay characteristics of the original polarized light transformed into P-polarized light L _p ( After the line), and penetrates the emitted toward the polarization splitting film 20, and then customize the light side of the prism 10 110, through the lens array 30.

Referring to FIG. 4, if the collimated red light L _R and the blue light L _B are incident perpendicularly from the outside of the other (upper drawing) optical plate 62, the red color is passed through. After the blue light-transmitting coating 620, and the optical flat plate 62, the retardation plate 40, and the array lens 30, the polarizing film 20 of the center of the main prism 10 is touched, wherein the P-polarity of the red light L _R and the blue light L _B The light ray L _P (indicated by a broken line, the same below) can pass through the polarizing beam splitting film 20, and then the light emitting side 101 of the autonomous prism 10 is passed through the array lens 30; and the red light ray L _R and the blue light ray L _B The S pole polarized light L _S (indicated by the solid line, the same below) is reflected to the right side when the polarizing beam splitting film 20 is encountered, passes through the array lens 30 and encounters the retarder 40 on the right side, and the optical plate 63 behind it, The coating 630 on the outer side of the optical plate 63 can reflect the red and blue light and combine the characteristics of the retardation film 40 to convert the original polarized light into the P-polar polarized light L _P (dashed line) and then hit the polarizing beam splitting film 20, penetrating it. Then encounter the array lens 30 on the left side, the retardation plate 40, and the optical plate 61 behind it, outside the optical plate 61 The side coating 610 can also reflect the red and blue light and combine the characteristics of the retardation film 40 to convert the original polarization light into the S pole pole light L _S (solid line) and then to the polarization beam splitting film 20, and then be reflected to the main The light exiting side 101 of the prism 10 is passed through the array lens 30 and then emitted.

The present invention uses a polarizing beam splitting film 20 (PBS) as the core of the light combining system, instead of (as shown in FIG. 12) the light combining method of the conventional X-type coating film 92, since the light source is a vertical incidence beam splitting film coating 610, 620, 630, Completely solve the loss of the combined light energy caused by the displacement of the spectral curve of the P, S polarized light (as shown in Figure 13) when the conventional spectroscopic film is incident at a large angle (such as 45°); this method is for the broadband green LED The light source (as shown in Figure 11, the green light source is generated by the blue LED excitation phosphor) is particularly effective.

In addition, in the present invention, the array lens 30 is placed around the main prism 10 shown in the first, second, third, and fourth figures, and the corresponding lens unit 31 on the array lens 30 divides each incident light beam into a plurality of small ranges. The secondary beam, each corresponding lens unit group, allows each secondary beam to pass back and forth between the main prism and each of the optical plates 61, 62, 63, and still maintains the size of the original secondary beam, the range of which is not expanded by the beam path Therefore, in the process of the combined light operation, the problem of volume increase and energy loss can be avoided; and the purpose of uniformizing the emitted illumination beam can be achieved, which is another advantage of the present invention.

Please refer to the arrangement example of the green light L _G , the red light L _R , and the blue light L _B shown in FIGS. 3 and 4 . Please refer to the light inlet 102 of the main prism 10 as shown in FIGS. 2 and 8 . A collimating Lens Module 70 is provided to provide a monochromatic and collimated light source to be vertically incident on the optical plate 61; and another adjacent optical port 103 is respectively provided with two The collimating lens module 71 of the opposite blue light source and the collimating lens module 72 of the red light source, together with a color beam splitter 73, can directly collimate the collimated light sources of red and blue colors from the optical flat plate 62 respectively. In addition, a light collecting lens group 80 and a prism group 81 of a total reflection projection prism (TIR Prism) are disposed on the light exiting side 101 of the main prism 10 to form a uniform beam after synthesis. guide panel 82, here a MEMS reflective projection panel (Digital Light Processing, i.e. DLP ^TM), by the projection lens 83 and projected by the image contained in the panel.

The above-mentioned condenser lens group 80, beamsplitter, detailed operation principles of the TIR prism 81, DLP ^TM panel 82, a projection lens 83, etc., are of conventional professional skills, which is not repeated herein.

Referring to the first and second figures, a polarizing conversion film 50 is disposed on the light emitting side 101 of the main prism 10 and opposite to the array lens 30 there. The surface of the polarizing conversion film 50 is provided with a space. The coating layer forms a polarization conversion region 51 having a phase retardation characteristic and an unactuated light transmission region 52. The polarization conversion region 51 and the light transmission region 52 each occupy half of the area of each lens unit 31 in the array lens 30 (eg, 2)); and the cladding of the polarization conversion region 51 has a half-wave plate characteristic, and the phase retardation axis of the cladding is 45 degrees or 135 degrees between the polarization directions of the electric field of the polarized light. The angle, the half-wave phase delay characteristic and the azimuth setting of the cladding can be used to interchange the polarization characteristics of the two incident polarized rays L _S and L _P .

The purpose of adding a polarizing conversion film to the light exiting side 101 of the main prism 10 is to further convert the emitted light into a specific polarized light, which is suitable for use in a liquid crystal panel type projection system. Please refer to the description of the second embodiment below.

Second embodiment:

See FIG. 5 as shown, if the collimated (Collimated) from the green light L _G (on the left in this figure) outside the optical plate 61 at an oblique angle to the direction of injection, just for green light through the penetration coating 610, and pass through the optical plate 61, retardation plate 40, the array lens 30, biasing the prism 10 touch the main pole film 20 points, where the green light L _G L S _S poles polarized light (solid line It is shown that the same polarized light-emitting film 20 is reflected to the light-emitting side 101 of the main prism 10 and is emitted, and passes through the array lens 30, and is arranged by a special oblique angle to make the reflected light L _S passes through the light-transmitting region 52 of the polarization conversion film 50, and still maintains the original polarization characteristic, and is the S-polar polarized light L _S ; but the P-polar polarized light L _{P of the} green light L _G (indicated by a broken line, the same below) Then, the polarizing film 20 is passed through the array lens 30 and encounters the retarder 40 on the right side, and the optical plate 63 behind it. The total reflection coating 630 on the outer side of the optical plate 63 reflects the green light and combines the retardation plate 40. characteristics of the original transformed into polarized light L _P S pole after pole bias light L _S (solid line) emitted to the polarization splitting film 20 Then reflected upward through lens array 30, the optical retardation plate 40 and the side plate 62 of, the outer side 620 of the reflective coating 62 and the optical plate retarder 40 binding properties of the original transformed into polarized light L P _S poles polarized light L _{After p} (dotted line), the polarizing film 20 is directed and penetrated, and the light emitting side 101 of the autonomous prism 10 is emitted. After passing through the array lens 30, the light is incident due to a special oblique angle incident. L _p polarized light by a polarization conversion section 50 converts the membrane 51, and converted into S-polarized light L _S pole, so it is possible to green light L _G in the S pole and the _S-polarized light L P electrode of _P-polarized light L Converted into two polarized rays L _S which are S poles, and simultaneously emits the high efficiency light combining module of the projection system of the present invention.

Referring to Fig. 6, if the collimated red light L _R and the blue light L _{B are} incident together from the outside of the other (upper drawing) optical plate 62 in an oblique direction, just pass through a coating 620 for red and blue light penetration, and passing through the optical flat plate 62, the retardation plate 40, and the array lens 30, respectively, touches the polarizing film 20 of the center of the main prism 10, wherein the red light L _R and The P-polar polarized light L _{P of the} blue light ray L _B (shown by a broken line, the same below) can pass through the polarizing beam splitting film 20, and then exits the light-emitting side 101 of the autonomous prism 10, passing through the array lens 30, by special The oblique incident configuration is such that the transmitted light L _p is converted into the S pole polarized light L _S through the polarization conversion region 51 of the polarization conversion film 50; and the S pole of the red light L _R and the blue light L _B The polarized light L _S (indicated by the solid line, the same below) is reflected to the right side when the polarizing film 20 is received, passes through the array lens 30 and encounters the retarder 40 on the right side, and the optical plate 63 behind it, the optical The coating 630 on the outer side of the flat plate 63 reflects red light and blue light and combines the characteristics of the retarder 40 to transform the original polarized light. Is deflected to the poles P-polarized light L _P polarization (broken line) after the film 20, the penetration, and then experience a delay of the left plate 40, an optical plate 61 and the rear, outer coating 61 of the optical plate 610 reflects red light and blue light and combines the characteristics of the retardation film 40 to convert the original polarization light into the S pole pole light L _S (solid line), and then strikes the polarization beam splitting film 20, and is reflected to the light exit side of the main prism 10 After the edge 101 is ejected and passed through the array lens 30, the reflected light ray L _S passes through the transparent region 52 of the polarization conversion film 50, and the original polarization characteristic is maintained, which is the S pole. The polarized light L _S ; this can convert the S pole polarized light L _S and the P pole polarized light L _{P in the} red light L _R and the blue light L _B into two polarized rays which are the same S pole L _S , juxtaposed to the high efficiency light combining module of the projection system of the present invention.

In this embodiment, a polarizing conversion film 50 is added, and the red, blue, and green incident light L _R , L _B , and L _{G of the} non-polar characteristic are combined, and all are converted into a single S polarized light L _S , which is suitable for liquid crystal. Panel type projection system is used.

Third embodiment:

Please refer to FIG. 7, when the collimated blue light L _B and the red light L _R mirror-symmetrical opposite direction (upward in this figure) incident on the optical plate 62, wherein the green light L _G and the red light L _R The conduction path is the same as that of the fifth and sixth diagrams respectively, and the S pole polarized light L _S which causes the green and red light passes through the light transmitting region 52 of the polarization conversion film 50, and still maintains the original polarization characteristic, and the P pole polarized light is made. L _p 51, converted into S-polarized light L _S poles polarized light by the polarization conversion area conversion film 50. The blue light L _B is just the opposite, see Fig. 7, by the angle of incidence of the red light L _R and the reverse impact symmetric, blue light from the P-polarized light L _p electrode through the light-transmitting area 52 of the polarization conversion film 50 Further, the P-polar polarization characteristic is maintained; and the S-polar polarized light L _s is converted into the P-polar polarized light L _p through the polarization conversion region 51 of the polarization conversion film 50.

For all colors uniform outgoing light biasing pole characteristic, in this embodiment, the main polarizing prism light conversion film ipsilateral side, an additional band with a phase-change plate (ColorSelect ^TM) 60. The characteristics of this component can change the polarization characteristics of a certain band by phase conversion without affecting the polarization properties of other bands. In this embodiment, the P-polarization of the blue-light band is converted into the S-polarization, and the red and green lights remain unchanged.

In the second and third embodiments, the polarization conversion region 51 of the polarization conversion film 50 is opposite to the position of the light transmission region 52, and the output polarization is converted from the original S pole polarization L _S to the P pole polarization. L _p can also be used in liquid crystal panel type projection systems, depending on the requirements of the polarization characteristics of the projection optical system.

It is known from the above description that the red, blue and green incident light L _R , L _B , L _{G of the} non-polar characteristic can be combined by the functions of the configuration of the embodiment, and all are converted into a single polarized light, which is suitable for liquid crystal. Panel type projection system is used.

Please refer to the green light L _G shown in Fig. 5, and the arrangement example of the red light L _R and the blue light L _B shown in Fig. 7, please refer to the drawing of the main prism 10 as shown in Figs. The optical port 102 is provided with a green light source collimating lens module 70 for providing a monochromatic and collimated light source to be incident on the optical flat plate 61 at an appropriate oblique angle; the red and blue light sources are adjacently packaged and aligned by a collimation The lens module 71 is integrated into a two-color light source module, and is placed at the light entrance 103, so that the red and blue collimated beams are incident on the optical plate 62 in the opposite direction of the mirror symmetry (above the figure), and in the main The light exiting side 101 of the prism 10 is provided with a band phase conversion sheet 60 for converting all incident light L _R , L _B , L _G into a single S polarized light. In addition, a collecting lens group 80 is disposed at the rear, and all the converted S pole polarizing rays L _{S can be} uniformly incident on a polarization beam splitter 810 (PBS) and a liquid crystal reflecting panel 82, and then the projection lens is used. 83 emits a high-intensity light that is sufficiently collected and has a single polarization.

The main prism of the present invention is provided with a polarizing beam splitting film which is diagonally connected, and the film layer is suitable for a complete visible light band, and is matched with an optical flat plate film which is incident at a vertical or a small angle, and is not suitable for light combining means. The conventional spectroscopic coating will cut off part of the light source band due to the large incident angle and the polarization characteristic; therefore, energy saving and greater brightness are the main advantages of the present invention.

Further, the polarizing film for use in the present invention is not only time-saving but also easy to process and relatively low in cost, which is another advantage in the production of the X-ray film.

The invention integrates the lens array, and can achieve the purpose of uniformizing the outgoing illumination beam; and in the light combining operation, the beam range does not expand due to the traveling of the light beam, thereby avoiding the problem of volume increase and energy loss, which is the present invention. Another advantage of the case.

When the invention is applied to a liquid crystal panel projection system, the utility model has the functions of separating and converting P polarized light (L _p ) and S polarized light (L _S ) in incident light into a single polarized light, which is more effective for collecting light. Yet another advantage of the present invention.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the practice of the present invention. Others, such as the addition of various conventional prism groups or prisms, have slightly different angles and different uses. The unit prism of the refractive index material constitutes the main prism; the polarizing beam splitting film made by using different processes or materials; and the position of each color light source is interchanged, or the components of the lens array, the retardation film, the polarization conversion film, the band phase conversion film and the like are changed. The equivalent substitutions and modifications made in the order and the scope of the invention are intended to be included within the scope of the invention.

In summary, the present invention has patent novelty, and the use value of the industry is more progressive and practical, and should be protected by patents, conforming to the novelty and practicability of patents, and is based on patents. The law stipulates that an application for a patent will be filed with the bureau.

10. . . Main prism

10A. . . Unit prism

10B. . . Unit prism

101. . . Side

102. . . Side

103. . . Side

104. . . Side

20. . . Bipolar split film

30. . . Array lens

31. . . Lens unit

40. . . Delay slice

50. . . Polarizing film

51. . . Polarized conversion zone

52. . . Light transmission area

60. . . Band phase conversion film

61. . . Optical plate

610. . . coating

62. . . Optical plate

620. . . coating

63. . . Optical plate

630. . . coating

70. . . Light source module

71. . . Light source module

72. . . Light source module

73. . . Color beam splitter

80. . . Condenser lens set

81. . . Prism group

810. . . Polar spectroscope

83. . . Projection lens

90. . . Light source module

91. . . Square prism

92. . . X-shaped coating

L _R . . . Light

L _G . . . Light

L _B . . . Light

L _P . . . Light

L _S . . . Light

C. . . region

Y. . . region

P. . . curve

S. . . curve

Figure 1 is a diagram showing the combined structure of the present invention.

Figure 2 is an exploded view of the present invention.

Fig. 2A is a view showing another exploded embodiment of the present invention.

Fig. 3 is a schematic view showing the projection of light when a color (e.g., green) light source is incident from the left side of the present figure when the present invention is applied.

Fig. 4 is a schematic view showing the projection of light when two other colors (for example, red and blue) are incident from above (this figure) when the present invention is applied.

Fig. 5 is a schematic view showing the projection of light when a light source of one color (e.g., green) is incident from the left side of the present pattern in the second embodiment of the present invention.

Fig. 6 is a schematic view showing the projection of light rays when a light source of another two colors (for example, red and blue) is incident from above (this figure) in the second embodiment of the present invention.

Fig. 7 is a schematic view showing changes in light projection of two colors (e.g., red and blue) when a light source is incident from above (this figure) in the third embodiment of the present invention.

Fig. 8 is a view showing an application example of the present invention.

Figure 9 is a diagram of an application embodiment of the present invention.

Fig. 10 is a schematic view showing the structure of a main prism formed by integrally molding a unit prism and an array lens.

Figure 11 is a schematic representation of the spectrum of a light source used in the present invention.

Figure 12 is a schematic diagram of a conventional projection structure.

Figure 13 is a schematic diagram showing the displacement of the spectral characteristics of P and S in a spectroscopic coating using a large angle incident.

10. . . Main prism

10A. . . Unit prism

10B. . . Unit prism

101. . . Side

102. . . Side

103. . . Side

104. . . Side

20. . . Bipolar split film

30. . . Array lens

31. . . Lens unit

40. . . Delay slice

50. . . Polarizing film

51. . . Polarized conversion zone

52. . . Light transmission area

60. . . Band phase conversion film

61. . . Optical plate

610. . . coating

62. . . Optical plate

620. . . coating

63. . . Optical plate

630. . . coating

Claims (8)

A "high-efficiency light-combining module for a projection system" includes at least one main prism, which is a cylindrical body, wherein three sides are set as light-injecting light entrances or side edges reflected by light sources, and the other side is projected as a light source. a light-emitting side, and a polarizing film is disposed on a section between two opposite corners of the square prism of the main prism; four array lenses are provided with a plurality of closely arranged lens units respectively disposed on the side of the main prism; The delaying strips are respectively disposed on the three non-light-emitting sides of the main prism, and are opposite to the array lenses of the three sides, the retarder can exchange the p and S poles of the folded light; three optical flat plates, They are respectively disposed on the outer sides of the above three retarders and the array lens, and one of the three optical plates is respectively provided with a coating for passing or reflecting specific light. The "high-efficiency light combining module of a projection system" according to the first aspect of the invention, wherein the main prism is formed by relatively combining unit prisms of two triangular columns. The "high-efficiency light combining module of a projection system" according to the first aspect of the invention, wherein one side of the main prism is integrally formed with at least one array lens. The "high-efficiency light combining module of the projection system" according to the first aspect of the invention, wherein the coating on the outer side of the optical plate is specularly reflected. For example, in the "high-efficiency light-combining module of the projection system" described in claim 1, wherein the coating of an optical plate is red light and blue light, and the green light is penetrated. The "high-efficiency light combining module of the projection system" according to the first aspect of the invention, wherein the coating of an optical plate is reflected by green light and penetrated by red light and blue light. The high-efficiency light-combining module of the projection system of claim 1, wherein a polarizing conversion film is disposed on the light-emitting side of the main prism, opposite to the array lens; and the surface of the polarizing conversion film is a spacer layer is formed to form a polarization conversion region having a phase retardation characteristic and an unactuated light transmission region, wherein the half-wave phase delay characteristic and the orientation setting of the polarization conversion region cladding layer can make two kinds of injections The polarization characteristics of the polarization rays L _S and L _{P are} interchanged; and the polarization conversion region and the light transmission region on the polarization conversion film each occupy half of the lens unit area of the array lens. The "high-efficiency light-combining module for a projection system" according to the first aspect of the invention, wherein a one-band phase conversion sheet is added to the same side of the polarization conversion film on the light-emitting side of the main prism.