WO2012089111A1

WO2012089111A1 - Prism system and projector comprising the same

Info

Publication number: WO2012089111A1
Application number: PCT/CN2011/084767
Authority: WO
Inventors: Lili Jiang; Qingtao Meng; Gaojin QI
Original assignee: Byd Company Limited
Priority date: 2010-12-30
Filing date: 2011-12-27
Publication date: 2012-07-05
Also published as: CN102565897A; CN102565897B

Abstract

A prism system and a projector comprising the same are provided. The prism system comprises: a first prism (2) adapted to couple with a diamond DMD chip and having first to third planes, and a second prism (3) having fourth to sixth planes. The first plane (21) is configured to receive an incident light at a predetermined angle and refract the incident light, the second plane (22) is configured to receive the light refracted by the first plane of the first prism and totally reflect the refracted light in the first prism, and the third plane (23) is parallel to a plane in which the diamond DMD chip is located and is configured to receive the light totally reflected by the second plane, refract and output the received light to the diamond DMD chip, and receive a reflected light from the diamond DMD chip and output the reflected light received from the diamond DMD chip at different angles based on a control of the diamond DMD chip. The second prism is configured to receive the reflected light output from the first prism and output the received reflected light at different angles based on different incidence angles of the reflected light received from the first prism. One of the fourth to sixth planes of the second prism is parallel to the second plane of the first prism and is configured to receive the reflected light output from the first prism.

Description

PRISM SYSTEM AND PROJECTOR COMPRISING THE SAME

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and benefits of Chinese Patent Application Serial No. 201010614398.X, filed with the State Intellectual Property Office of P. R. China on December 30, 2010, the entire content of which is incorporated herein by reference.

FIELD

The present disclosure relates to a prism system and a projector comprising the same.

BACKGROUND

LED (Light Emitting Diode) miniature projector is widely used due to its high efficiency, good contrast ratio and long life etc. Currently, LED miniature projector mainly realize its projection by using conventional DMD (Digital Micro mirror Device) chip and prism system. The conventional DMD chip produces an image of 1280x720 dpi by using an orthogonal pixel array, each rotation axis of miniature reflection lens of the prism system forms an angle of 45 degree with the long side of the chip and the miniature reflection lens may be dedicated to display one image pixel on a displaying device. However, in order to realize higher resolution and low system cost, the new type DMD chip is a diamond DMD chip and employs a diamond pixel arrangement, that is, the miniature reflection lens is rotated by 45 degree relative to the conventional DMD chip, thus the angle between each rotation axis of miniature reflection lens and the long side of the chip is 90 degree. Therefore, the current prism system is not adapted to and can not be coupled with the new DMD chip, so that the projection can not be realized. SUMMARY

The present disclosure is directed to solve at least one of the problems existing in the prior art. Accordingly, a prism system and projector comprising the same may be provided, in which the prism system is adapted to and can be coupled with the diamond DMD (Digital Micro mirror Device) chip.

According to embodiments of a first aspect of the present disclosure, a prism system may be provided. The prism system may comprise: a first prism adapted to couple with a diamond DMD chip and having:

a first plane configured to receive an incident light at a predetermined angle and refract the incident light,

a second plane configured to receive the light refracted by the first plane of the first prism and totally reflect the refracted light in the first prism; and a third plane parallel to a plane in which the diamond DMD chip is located, and configured to receive the light totally reflected by the second plane, refract and output the received light to the diamond DMD chip, and receive a reflected light from the diamond DMD chip and output the reflected light received from the diamond DMD chip at different angles based on a control of the diamond DMD chip; and

a second prism having fourth to sixth planes and configured to receive the reflected light output from the first prism and output the received reflected light at different angles based on different incidence angles of the reflected light received from the first prism, in which one of the fourth to sixth planes of the second prism is parallel to the second plane of the first prism and configured to receive the reflected light output from the first prism.

According to embodiments of a second aspect of the present disclosure, a projector comprising the prism system according to the embodiments of the fist aspect of the present disclosure may be provided. The projector may comprise: a light source configured to generate and output light; a light process unit configured to process the light from the light source and output an incident light; a prism system configured to receive the incident light from the light process system, totally reflect the incident light and output the reflected light, in which the prism system is according to an aspect of the present disclosure; a diamond DMD chip coupled with the prism system to receive and reflect the light output from the prism system, and control an output direction of the light reflected thereby from the prism system; and a projection objective lens configured to receive the reflected light output from the prism system and output the reflected light to a screen.

With the prism system and the projector according to embodiments of the present disclosure, by setting the angle between the first plane and the incident light and the angle between the second plane and incident light, the incident light is firstly totally reflected by the second plane and then refracted by the third plane to output to the diamond DMD chip. The diamond DMD chip may have ON and OFF states; the output angle of reflected light from the DMD chip may be different when DMD chip is in its different states. The reflected light output from the diamond DMD chip may be refracted by the third and second planes of the first prism and enter into the second prism, the second prism may output the reflected light at different angles according to the angles of the reflected light from the first prism. In other words, the reflected light may be output from the second prism at two different angles. Also both the first and second prisms may have three planes such that the angle between the planes of the first and second prisms and the incident light is predetermined. When the incident light enters into the prism system at the predetermined angle, the prism system may only output the reflected light at two different angles according to the two states of the DMD chip. The output lights at two different angles form contrast there between, so that the DMD chip is adapted to and can be coupled with prism system. In addition, the prism system has a simple structure and the light transmit path thereof is also simple, the times of light reflection and refraction may be reduced so as to reduce the energy loss and enhance the utilization rate. With the projector with the above prism system, the prism system outputs the reflected light at different angles, the light at one angle may be output to projection objective lens which outputs the reflected light to a screen, thus achieving projection of the projector, and the reflected light at the other angle may not be output by the projection objective lens, thus realizing the projection with two different contrasts.

Additional aspects and advantages of the embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other features and advantages of the disclosure will become apparent and more readily appreciated from the following descriptions taken in conjunction with the drawings in which:

Fig. 1 is a structural schematic view of the projector according to an embodiment of the present disclosure;

Fig. 2 is a structural schematic view of the prism system according to a first embodiment of the present disclosure when the diamond DMD chip is in ON state;

Fig. 3 is a structural schematic view of the prism system according to a first embodiment of the present disclosure when the diamond DMD chip is in OFF state;

Fig. 4 is a structural schematic view of the prism system according to a second embodiment of the present disclosure when the diamond DMD chip is in OFF state;

Fig. 5 is a structural schematic view of the prism system according to a third embodiment of the present disclosure when the diamond DMD chip is in ON state;

Fig. 6 is a structural schematic view of the prism system according to a third embodiment of the present disclosure when the diamond DMD chip is in OFF state.

DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the present disclosure. The embodiments described herein with reference to drawings are explanatory, illustrative, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions.

As shown in Fig.2 and 3, according to an embodiment of the present disclosure, the prism system comprises a first prism 2 and a second prism 3. The first prism 2 may be coupled with the diamond DMD chip 1 and has three (vertical) planes: a first plane 21, a second plane 22 and a third plane 23.

The first plane 21 is configured to receive an incident light at a predetermined angle and refract the incident light. The second plane 22 is configured to receive the incident light refracted by the first plane 21 and totally reflect the refracted light in the first prism 2. The third plane 23 of is parallel to the plane in which the diamond DMD chip 1 is located and configured to receive the light totally reflected by the second plane 22, refract the received light and output it to the diamond DMD chip 1, receive the reflected light from the diamond DMD chip 1 and output the reflected light at different angles according to the control of the diamond DMD chip 1.

The second prism 3 also have three planes: the fourth plane 31, the fifth plane 32 and the sixth plane 33, and configured to receive reflected light output from the first prism 2 and output the received reflected light at different angles according to different input angles of the incidence angles of the reflected right received from the first prism 2. The one plane of the second prism 3 is parallel to the second plane 22 of the first prism 2 and configured to receive the reflected light output from the first prism 2.

According to optical principle, the light will be totally reflected when it is incident on an interface at an incidence angle greater than the critical angle of total reflection. When two mediums having different refractive indexes are contacted with each other, whether the light transmitted from one medium to the other may enter into the other medium will be determined by the incidence angle thereof, that is, the light may enter into the other medium or be totally reflected to the one medium according to the incidence angle of the light. For example, the K9 glass has a refractive index n of 1.5164, when it is disposed in the air (refractive index n' of the air is 1), n and n' represents the refractive indexes of the air and the glass K9 at the interface respectively. Assuming that the light enters from the glass into the air at an incidence angle a and the incidence angle a is the critical angle of total reflection, the emergence angle a' of the light output from the air is 90 degree, according to Snell'Law, the critical angle of total reflection is arcsin[n ' sin(a')/ sin(a)]=41.3 degree, that is, when the incidence angle of the light from the glass to air is greater than 41.3 degree, the incident light may will be totally reflected.

By setting the angle between the first plane 21 and the incident light and the angle between the second plane 22 and the incident light, the incidence angle of the light incident on the second plane 22 may be controlled to be greater than 41.3 degree, so that the incident light may be totally reflected by the second plane 22 and then refracted by the third plane 23 to output to the diamond DMD chip 1. After the digital micro-mirror unit of the diamond DMD chip 1 receives the incident light, it may reflect the received incident light. Since the diamond DMD chip 1 may reflect the incident light at an angle of -12 degree to 12 degree, the diamond DMD chip 1 has two states: On and Off. The output angle of the light output from the DMD chip 1 may be different when the diamond DMD chip is in the different states. The reflected light output by the diamond DMD chip 1 may be refracted by the third plane 23 and second plane 22 of the first prism 2 and then enter into the second prism 3. The second prism 3 may output the reflected light at different angles according to the angles of the reflected light entering therein, that is, the reflected light may be output at two angles by the second prism 3. At the same time, each of the first prism 2 and second prism 3 has three (vertical) planes, as shown in Fig.l, the planes are perpendicular to the paper plane, so that the angle between the planes of the first prism 2 and second prism 3 and the incident light are predetermined by the cooperation of the first prism 2, second prism 3 and the integral lens 54. Therefore, when the incident light enters into the prism system at the predetermined angle, the prism system may output reflected light only at two different angles corresponding to the two states of the DMD chip 1, that is, when the DMD chip 1 is in its two different states, the reflected lights output by the prism system form optical contrast therebetween, such that the DMD chip 1 may be adapted to and can be coupled with prism system, and the prism system has a simple structure and the light transmit path is also simple, the times of light reflection and refraction may be reduced so as to reduce the energy loss during light transmission and enhance the utilization rate.

In order to realize the projection, as shown in Fig.l, a projector may be also provided by the present disclosure, comprising: a light source 4 configured to generate and output light; a light process unit configured to process the light from light source and output an incident light; a prism system configured to receive the incident light from the light process system and totally reflect the incident light and output the reflected light; a diamond DMD chip 1 coupled with the prism system to receive and reflect the light output from the prism system and control the output direction of the reflected light in the prism system; a projection objective lens 6 configured to receive the reflected light output from the prism system and output the received reflected light to a screen.

The prism system may comprise: a first prism 2 and a second prism 3. The first prism 2 may be coupled with the diamond DMD chip 1 and has three (vertical) planes: a first plane 21, a second plane 22 and a third plane 23.

Since the diamond DMD chip 1 has ON and OFF states, when the diamond DMD chip 1 is in the ON state, that is, the angle between the digital micro-mirror unit and the diamond DMD chip 1 may be 12 degree, the (vertical) reflected light output from the diamond DMD chip 1 may be refracted by the third plane 23 and second plane 22 of the first prism 2 and enter into the second prism 3, and then the light may be refracted by the second prism 3 and output to the projection objective lens 6 at one angle. When the angle between the digital micro-mirror unit and the diamond DMD chip 1 is -12 degree, the light refracted and output by the second prism 2 at another angle may not be output to the projection objective lens 6, that is, the prism system coupled with the DMD chip 1 may output the reflected light at two different angles according to the states of DMD chip 1, in which the reflected light at the one angle may be output by the objective lens 6 to the screen so as to achieve projection, and the reflected light at the other angle may not be output by the objective lens 6 to the screen, thus realizing two projections with different contrast ratios , that is, the prism system is adapted to and can be coupled with the diamond DMD chip 1.

In some embodiments of the present disclosure, the light source 4 may be LED (Light Emitting Diode) tricolor light source and configured to output a RGB (red, green, blue) light. Furthermore, the light process unit may comprise: a collimating lens assembly 51 configured to receive the light from the tricolor light source and output R light, G light and B light parallel to each other; a tricolor synthetic lens 52 configured to synthesize the R light, G light and B light from the collimating lens into mixed parallel lights and output the mixed parallel lights; a fly-eye lens assembly 53 configured to receive the mixed parallel lights from the tricolor synthetic lens and output parallel lights with facula adapted to the diamond DMD chip; and an integral lens 54 configured to receive and converge parallel light from fly-eye lens assembly 53 and output the converged parallel lights to the prism system.

In some embodiments, the collimating lens assembly 51 may be disposed in front of the light resource of each color, the light of each color may be diverged to be parallel lights to increase the utilization ratio of the light source; then the lights of the three different colors may be mixed by the tricolor synthetic lens 52 to form mixed parallel lights to be output, thus the size of the projector may be reduced and the light utilization ratio of the projector may be increased. The facula of the mixed parallel lights may be shaped by the fly-eye lens assembly 53, and when the light facula is larger than the diamond DMD chip 1, only the light output onto the diamond DMD chip 1 may be reflected and used, the other light may be lost. Optionally, the facula may be shaped to mach or suitable for with the shape of the DMD chip 1. If the facula output to the diamond DMD chip is not even, the projected light will be not even either, thus disadvantageously affect the effect of the projection, and the projected image may be shown with one dark side and one bright side. In order to increase the utilization ratio of the light and the evenness of the projected picture, the fly-eye lens assembly 53 may be utilized to change the facula of the mixed parallel lights into an even facula , so that the even facula is adapted to and can be coupled with the DMD chip 1. After the facula of the light being changed into even facula, the light output from fly-eye lens assembly 53 may be converged by the integral lens 54 and then output to the first plane 21 of the prism system.

In some embodiments of the present disclosure, the fourth plane 31 of the second prism 3 is paralleled to the second plane 22 of the first prism 2 and configured to refract and output the reflect light received from the first prism 2. The fifth plane 32 is configured to receive and output the light refracted by the fourth plane 31 when the diamond DMD chip 1 is in ON state. The sixth plane 33 is configured to receive and output the light refracted by the fourth plane 31 when the diamond DMD chip 1 is in OFF state.

As shown in Fig.2 and 3, when the diamond DMD chip is ON, the reflected light from the DMD chip 1 may be almost vertical to the third plane 23, and the light may be refracted by the third plane 23 and second plane 22 of the first prism 2 and then the light runs through the fourth plane 31 and fifth plane 32 to output light which may be almost vertical to the incident plane of the objective lens 6. When the diamond DMD chip 1 is OFF, the reflected light output from the diamond DMD chip 1 may be refracted by the third plane 23 and second plane 22 of the first prism 2 and then refracted by the fourth plane 31 to be output to the sixth plane 33. When the sixth plane 33 is a smooth plane, the light received by the sixth plane 33 may be output after reflection or refraction, but the reflected light can not be reflected and projected by the projection objective lens 6.

Furthermore, the second prism 3 may be a triangular prism and the fourth plane 31, the fifth plane 32 and the sixth plane 33 may be the side planes of the second prism 3, that is, the fourth plane 31, the fifth plane 32 and the sixth plane 33 may be quadrilateral planes. The second prism 3 may be a right-angle triangular prism, as shown in Fig.2 and 3, each of the fourth plane 31, the fifth plane 32 and the sixth plane 33 may be shown as a line and the triangle formed by the three lines may be shown as the cross-section of the second prism 3.

Furthermore, when the diamond DMD chip is OFF, the reflected light output from the diamond DMD chip 1 may be perpendicular to the sixth plane 33 to facilitate the light to be transmitted from the sixth plane 33 as many as possible and not output to the projection objective lens 6. In order to make prism system with small and simple structure, the angle between the sixth plane 33 and the plane in which diamond DMD chip 1 is located may be 23 degree and the angle between the sixth plane 33 and the plane in which diamond DMD chip 1 is located may be an acute angle, that is, the sixth plane 33 may be rotated around the connecting point of the sixth plane 33 with the fourth plane 31 along the leftward direction as shown in Fig.3, until the angle between the sixth plane 33 and the plane in which diamond DMD chip 1 is located is 23 degree, so that the size of the fifth plane in the transverse direction is reduced, the prism system has a small and simple structure and the light will be transmitted from the sixth plane 33 as many as possible and not output to the projection objective lens 6.

In some embodiments, the sixth plane 33 may be a light absorption plane and absorb the received light without reflection, thus realizing relative higher contrast ratio. Optionally, the angle between the sixth plane 33 and the plane in which diamond DMD chip 1 is located may be 90 degree, so that the sixth plane 33 will absorb the light totally, thus realizing higher contrast ratio and reducing the size of the prism.

In another embodiment of the present disclosure, when the diamond DMD chip 1 is ON, the light path in the prism system may be the same as that in the first embodiment. However, when the diamond DMD chip is OFF, as shown in Fig.4, the planes of the second prism 3 may comprise a fourth plane 31 and a fifth plane 32. The fourth plane 31 may be parallel to the second plane 22 and be configured to receive, refract and output the reflected light output from the first prism 2, and the fifth plane 32 may be configured to receive and refract the light from the fourth plane 32 and then output the light.

The fifth plane 32 may be enough large in the transverse direction (the left and right direction in Fig. 4), as shown in Fig.4, when the diamond DMD chip 1 is OFF, the reflected light output from diamond DMD chip 1, refracted by and output from the fourth plane 31 will be output directly by the fifth plane 32, not run through the sixth plane 33. Of course, the reflected light will not be projected by the objective lens 6. The second prism 3 may also comprise a sixth plane 33 which is not a transparent plane and may be a light absorption plane or a smooth plane.

Furthermore, the fifth plane 32 may be perpendicular to the reflected light refracted thereby and output therefrom so as to facilitate the disposing of the objective lens 6 below the fifth plane 32. At the same time, it is easy to cause the reflected light after refraction parallel to the optical axis of the objective lens 6, thus increasing the utilization ratio of the light source and enhancing the projection effect.

Optionally, the fifth plane 32 may be parallel to the incidence light. Of course, the fifth plane 32 may be parallel to the incidence light. However, the structure of the prism system may be simpler and the projection effect may be better when the fifth plane 32 is parallel to the incidence light.

Optionally, the third plane 23 and the fifth plane 32 may not be paralleled with each other. According to another embodiment and as shown in Fig.5 and 6, in order to achieve better projection effects, the fifth plane 32 and the third plane 23 are parallel with each other, so that viewing from the direction of the reflected light output by diamond DMD chip 1, the fifth plane 32 and the third plane 23 may form two parallel glass plates to facilitate the design of the projection lens, so that the projection effect is better and the structure of the prism system is simpler.

Furthermore, the third plane 23 may be parallel to the incident light, that is, the third plane 23 may be parallel to the optical axis of the integral lens 54 and has no oblique angle in the transverse direction. Of course, the third plane 23 may not be parallel to the incident light, but the diamond DMD chip 1 may be disposed to be parallel to and coupled with the third plane 23 and the third plane 23 may be parallel to the incident light to facilitate the disposing of the diamond DMD chip 1. In some embodiments, the diamond DMD chip 1 may be coupled with the third plane 23 via an air space layer to facilitate the assembly and disassembly between the diamond DMD chip 1 and the third plane 23. Meanwhile, the second plane 22 and the fourth plane 31 may be coupled via an air space layer in some embodiments.

In some embodiments, the third plane 23 may be parallel to the fifth plane 32 and the incident light, that is, both the third plane 23 and the fifth plane 32 may be parallel to the optical axis of the integral lens 54. When the diamond DMD chip 1 is ON, the diamond DMD chip 1 may output the reflected light perpendicular to the plane in which the diamond DMD chip 1 is located (i.e. vertical reflected light), and the vertical reflected light may refracted by the third plane 23 and second plane 22 of the first prism 2 and then run through the fourth plane 31 and fifth plane 32 to output a vertical reflected light to the objective lens 6. When the diamond DMD chip is OFF, the angle between the reflected light output by the diamond DMD chip 1 and the plane in which the diamond DMD chip 1 is located may be 36 degree, the reflected light output by the diamond DMD chip 1 may be refracted by the third plane 23 and second plane 22 of the first prism 2, then refracted by the fourth plane 31 of the second prism and output to the sixth plane 33. When the sixth plane 33 is a smooth plane, the reflected light received by the sixth plane 33 after refraction may be refracted or reflected to output, the output light may be output to the objective lens 6. However, the light that can be used by the objective lens 6 is related to the turning angle of the diamond DMD chip 1. The turning angle range of the diamond DMD chip 1 may be approximately the same as the angle range of the light in which the light can be received and used by the objective lens 6, that is, the angle between the incident light and the plane in which diamond DMD chip 1 is located may be -12 to 12 degree. Because the fifth plane 32 is parallel to the diamond DMD chip 1, and the angle of light reflected by the diamond DMD chip 1 is about 36 degree and much larger than the range of -12 to 12 degree, the reflected light may be blocked by the diaphragm of the objective lens 6. Therefore, the reflected light may not be projected, thus achieving relative high contrast ratio.

In some embodiments, the angle between the plane in which diamond DMD chip 1 is located and the normal of the first plane may be 23-25 degree, and the angle between the plane in which diamond DMD chip 1 is located and the normal of the second plane may be 55-59 degree, that is, the angle between the incident light and the normal of the first plane may be 23-25 degree, and the angle between the incident light is located and the normal of the second plane may be 55-59 degree, so that the incident light may be totally reflected and then output to diamond DMD chip 1.

Furthermore, the first prism 2 may be a triangular prism and the first plane 21, the second plane 22 and the third plane 23 may be side planes of the first prism 2, that is, the first plane 21, the second plane 22 and the third plane 23 may be quadrilateral planes. The first prism 2 may be right-angle triangular prism with the first plane 21, the second plane 22 and the third plane 23, as shown in Fig.5 and 6, each of the first plane 21, the second plane 22 and the third plane 23 may be shown as a line and the triangle formed by the three lines may be shown as the cross-section of the first prism 2.

In order to improve projection effect, the first prism 2 and the second prism 3 may be formed by glass materials with low refraction rate n and high dispersion number v, for example, the refraction rate n may be smaller than 1.55 and the dispersion number v may be greater than 50. In some embodiments, the first prism 2 and the second prism 3 may be formed by glass materials of BK7 or K9 with the refraction rate n=1.5164 and dispersion number v=64.13333, thus improving the projection effect.

Reference throughout this specification to "an embodiment", "some embodiments", "some embodiments", "an example", "a specific examples", or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least some embodiments or example of the disclosure. Thus, the appearances of the phrases such as "in some embodiments", "in some embodiments", "in an embodiment", "an example", "a specific examples", or "some examples" in various places throughout this specification are not necessarily referring to the same embodiment or example of the disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that changes, alternatives, and modifications may be made in the embodiments without departing from spirit and principles of the disclosure. Such changes, alternatives, and modifications all fall into the scope of the claims and their equivalents.

Claims

WHAT IS CLAIMED IS:

1. A prism system, comprising:

a first prism adapted to couple with a diamond DMD chip and having:

a second plane configured to receive the light refracted by the first plane of the first prism and totally reflect the refracted light in the first prism; and

a third plane parallel to a plane in which the diamond DMD chip is located, and configured to receive the light totally reflected by the second plane, refract and output the received light to the diamond DMD chip, and receive a reflected light from the diamond DMD chip and output the reflected light received from the diamond DMD chip at different angles based on a control of the diamond DMD chip; and

2. The prism system of claim 1, wherein the fourth plane of the second prism is parallel to the second plane of the first prism and configured to refract the reflected light received from the first prism;

wherein the fifth plane is configured to receive the right refracted by the fourth plane, refract and output the right refracted by the fourth plane when the diamond DMD chip is ON; and

wherein the sixth plane is configured to receive the light refracted by the fourth plane when the diamond DMD chip is OFF.

3. The prism system of claim 2, wherein the sixth plane is light absorption plane.

4. The prism system of claim 3, wherein an angle between the sixth plane and the plane in which the diamond DMD chip is located is 90 degree.

5. The prism system of claim 2, wherein an angle between the sixth plane and the plane in which the diamond DMD chip is located is 23 degree and an angle between the sixth plane and the fourth plane is an acute angle.

6. The prism system of claim 1, the fourth plane of the second prism is parallel to the second plane of the first prism and configured to refract the reflected light received from the first prism; and

wherein the fifth plane is configured to receive the right refracted by the fourth plane, refract and output the right refracted by the fourth plane.

7. The prism system of claim 2, wherein the second prism is a triangular prism and the fourth to sixth plane are side surfaces of the second prism.

8. The prism system of claim 2, wherein the fifth plane is perpendicular to the light output therefrom.

9. The prism system of claim 6, wherein the fifth plane is perpendicular to the light output therefrom.

10. The prism system of claim 2, wherein the fifth plane is parallel to the third plane.

11. The prism system of claim 6, wherein the fifth plane is parallel to the third plane.

12. The prism system of claim 2, wherein the fifth plane is parallel to the incident light.

13. The prism system of claim 6, wherein the fifth plane is parallel to the incident light.

14. The prism system of claim 1, wherein the third plane is parallel to the incident light.

15. The prism system of claim 1, wherein the first prism is a triangular prism and the first to third planes are side surfaces of the first prism.

16. The prism system of claim 1, wherein an angle between a normal line of the first plane and the plane in which the diamond DMD chip is located is 23 -25 degree, and an angle between a normal line of the second plane and the plane in which the diamond DMD chip is located is 55 -59 degree.

17. A projector, comprising:

a light source configured to generate and output light;

a light process unit configured to process the light from the light source and output an incident light;

a prism system configured to receive the incident light from the light process system, totally reflect the incident light and output the reflected light;

a diamond DMD chip coupled with the prism system to receive and reflect the light output from the prism system, and control an output direction of the light reflected thereby from the prism system; and

a projection objective lens configured to receive the reflected light output from the prism system and output the reflected light to a screen;

wherein the prism system is any one of claims 1-16.

18. The projector of claim 17, wherein the light source is a tricolor light source and configured to output R, G, B light.

19. The projector of claim 18, wherein the light process unit comprises:

a collimating lens assembly configured to receive the R, G, B light from the tricolor light source and output parallel lights;

a tricolor synthetic lens configured to synthesize parallel lights from the collimating lens into mixed parallel lights and output the mixed parallel lights;

a fly-eye lens assembly configured to receive the mixed parallel lights from the tricolor synthetic lens and output parallel lights with facula adapted to the diamond DMD chip; and

an integral lens configured to receive and converge the parallel lights from fly-eye lens assembly so as to output the converged parallel lights to the prism system.