CN201166742Y

CN201166742Y - High light effect tricolored light source monolithic type liquid crystal projecting system

Info

Publication number: CN201166742Y
Application number: CNU2008200927489U
Authority: CN
Inventors: 曲鲁杰; 王仁贵
Original assignee: Butterfly Technology Shenzhen Ltd
Current assignee: Butterfly Technology Shenzhen Ltd
Priority date: 2008-03-17
Filing date: 2008-03-17
Publication date: 2008-12-17
Anticipated expiration: 2018-03-17

Abstract

The utility model relates to a tri-colored light source monolithic type liquid crystal projection system with high luminous efficiency. The projection system comprises red, green and blue light sources (1r, 1g and 1b), a beam combining cubic prism (2), a polarization light splitter (3), an imaging chip (4), and a projection lens (5). The red, the green and the blue light sources (1r, 1g and 1b) are respectively arranged on three sides of the beam combining cubic prism (2), and a polarization transformer is arranged between each light source and the beam combining cubic prism (2). The light output by the tri-colored light sources is respectively converted into S polarized light via the polarization transformer, and is then incident into the beam combining cubic prism (2) to acquire red green blue synthesized S polarized light, which is finally emergent from the beam combining cubic prism (2); and the red-green-blue synthesized S polarized light is incident into the polarization light splitter (3), and is totally reflected for illuminating the imaging chip (4). The utilization rate of illumination light is increased and the brightness of the projected image is improved.

Description

High light efficiency three-color light source one chip LCD projecting system

Technical field

The utility model relates to the crystal projection technology, particularly a kind of LCD projecting system with three-color light source, single imager chip that has improved light utilization efficiency.

Background technology

Light-combining prism (X-cube) is used for synthesizing red, blue, green three coloured light lines, it is generally the cubic prism, two diagonal planes are divided into four cross facets by intersection, be coated with the optical thin film of different qualities on these four cross facets respectively, be used for the specific color polarization state light of transmission, and the specific color polarization state light of reflection.

Fig. 1 has announced a kind of single-chip LCD projecting system of utilizing above-mentioned light-combining prism, with red, green,

blue light source

1r, 1g, 1b as lighting source, the light that light-combining prism 2 synthetic these three-color light sources send is a branch of, inject polarizing beam splitter 3, this polarizing beam splitter 3 enters imaging liquid crystal panel 4 with the reflection of S polarized light, this imaging liquid crystal panel 4 is modulated into the P polarized light with the S polarized light and carries picture signal output, should transmit through polarizing beam splitter 3 with the P polarized light of image information then, enter projecting lens 5, be projected onto on the screen at last and show.

Obviously, 4 of imaging liquid crystal panels have used the S polarized light in the illuminating bundle, be other light beams of 50%: the P polarized light all transmits polarizing beam splitter 3 and loses, and light utilization efficiency is so low, and this is the darker one of the main reasons of image display frame of present single-chip LCD projecting system.In fact the described P polarized light that loses comprises two parts: the one, and polarizing beam splitter 3 isolated P polarized light total losses are fallen, and the 2nd, also comprise the part P polarized light that light-combining prism 2 loses in synthetic light beam process.

Single-chip LCD projecting system cost is very low, and in order further to promote its market competitiveness, the primary problem that solves is to improve its light efficiency, to improve the projected image picture quality.

Summary of the invention

The purpose of this utility model promptly is in order to address the above problem, improved three-color light source one chip LCD projecting system has high light efficiency, the light beam that light source sends all is converted to the S polarized light, finally can all be utilized, improve Projection Display brightness by the imaging liquid crystal chip from the light that closes the outgoing of light cube prism.

The purpose of this utility model is achieved through the following technical solutions:

A kind of high light efficiency three-color light source one chip LCD projecting system, it comprises red, green, blue three light sources, close the light cube prism, polarizing beam splitter, imager chip and projecting lens, described red, green, blue three light sources lay respectively at three sides of closing the light cube prism, the light of output is closed the light cube prism and synthesizes a branch of light and inject polarizing beam splitter, this polarizing beam splitter is isolated polarized light and is offered imager chip, this imager chip modulates image light and penetrates from projecting lens at last, wherein: at each light source and close and be provided with a polarization converter between the light cube prism.

The light that each light source sends all is converted to the S polarized light and enters and close the light cube prism behind polarization converter.

On the basis of the above, further technical scheme is:

Described polarization converter is by two parallelogram prisms and is clipped in equilateral right-angle triangle prism in the middle of it prism that to synthesize a cross section be isosceles trapezoid, on the faying face of these two parallelogram prisms and equilateral right-angle triangle prism, be coated with the polarization spectro rete to form polarization light-dividing surface, be coated with reflective coating on the opposite side inclined-plane of parallelogram prism forming reflecting surface, also gummed has 1/2nd wave plates with this bottom surface homalographic on the bottom surface of this equilateral right-angle triangle prism.

Described polarization converter with close the light cube prism and compose one.

Described red, green, blue three light sources are the led light source or the LASER Light Source of respective color.

Described imager chip is the LCOS liquid crystal panel.

The utility model is compared to the improvements of prior art:

At red, green, blue three light sources and close a polarization converter all is set between the light cube prism, the light beam that light source can be sent all is converted into to inject behind the S polarized light again and closes the light cube prism and synthesize, this light beam that closes after the light cube prism is synthesized is the S polarized light, inject behind the polarizing beam splitter all indirect illumination imager chips, promptly avoided light loss, the utility model has improved light efficiency significantly, has improved projected image brightness.

Description of drawings

Fig. 1 is the synoptic diagram of three light source single-chip LCD projecting system in the background technology.

Fig. 2 is the synoptic diagram of the utility model LCD projecting system.

Fig. 3 is the structure and the principle of work synoptic diagram of polarization converter described in the utility model.

The light that Fig. 4 sends for RGB light source in the utility model is exported each color S light beam respectively and is entered and close the light path synoptic diagram that the light cube prism is synthesized after polarization converter.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is further described.

Please refer to Fig. 2, a kind of high light efficiency three-color light source one chip LCD projecting system, it comprises RGB three

light source

1r, 1g, 1b, close light cube prism 2, polarizing beam splitter 3, imager chip 4 and projecting lens 5, described RGB three

light source

1r, 1g, 1b is positioned at three sides of closing light cube prism 2, exporting light respectively enters and closes light cube prism 2 and be synthesized to a branch of light and inject polarizing beam splitter 3, this polarizing beam splitter 3 is isolated polarized light and is offered imager chip 4, this imager chip 4 modulates image light and sees through polarizing beam splitter 3 earlier at last from projecting lens 5 ejaculations, wherein at each light source and close and be provided with a polarization converter 6 between the light cube prism 2, three polarization converters 6 are set altogether, RGB three

light source

1r, 1g, the light that 1b sends all is converted to the S polarized light and enters and close light cube prism 2 behind this polarization converter 6.

Particularly, led light source or LASER Light Source that the RGB three light source 1r that the utility model adopted, 1g, 1b are preferably respective color are to obtain high brightness and to enrich colour gamut.Imager chip 4 adopts the LCOS silica-based liquid crystal panels, is the S polarized light all from the light that closes 2 outgoing of light cube prism, injects polarizing beam splitter 3 back being reflected at its light splitting surface and enters this imager chip 4.

Described polarization converter 6 is the utility model vitals, its structure better embodiment is seen shown in Figure 3: this polarization converter 6 is by two

parallelogram prisms

61,63 and be clipped in equilateral right-angle triangle prism 62 in the middle of it prism (" parallelogram; equilateral right-angle triangle; isosceles trapezoid " all refers to the shape of cross section of prism) that to synthesize a cross section be isosceles trapezoid, the acute angle of described parallelogram is 45 °, at these two

parallelogram prisms

61,63 with the faying face of equilateral right-angle triangle prism 62 on be coated with the polarization spectro rete to form polarization light-dividing surface, parallelogram prism 61, be coated with reflective coating on 63 the opposite side inclined-plane to form reflecting surface, also gummed has 1/2nd wave plates 64 with this bottom surface homalographic on the bottom surface of this equilateral right-angle triangle prism 62, / 2nd specific wave plates 64 can change into another kind of polarization state light with a kind of polarization state light of particular color, for example the P polarized light are changed into the S polarized light.

The building block of this polarization converter 6 forms integrated by gummed, simultaneously again will described three polarization converters 6 and close light cube prism 2 and compose one (gap can be filled with transparent material), the utility model compact conformation like this, good reliability.

The effect of this polarization converter 6 is to export after the light beam from light source all is converted to the S polarized light, its principle of work sees that Fig. 3 illustrates: inject from the light beam of light source on two polarization light-dividing surfaces of this polarization converter 6, all be divided into S polarized light and P polarized light, wherein the S polarized light is polarized light splitting surface and reflects to reflecting surface, this S polarized light face reflection output that is reflected again then.And the P polarized light directly sees through polarization light-dividing surface and injects 1/2nd wave plates 64, exports after being converted into the S polarized light by this 1/2nd wave plate 64.

The front is mentioned light that

RGB light source

1r, 1g, 1b send and is closed light cube prism 2 at last and synthesize the outgoing of a branch of S polarized light, concrete optical path please refer to Fig. 4: at first

RGB light source

1r, 1g, 1b export red, green, blue S polarized light respectively after polarization converter 6 effects, promptly inject the whole S of the being polarized lights that close light cube prism 2.First bundle of red S polarized light (R mark) sees through first light splitting surface 21, and then by the 22 reflection outputs of second light splitting surface, second Shu Shouxian of red S polarized light is seen through 21 outputs of first light splitting surface then by 23 reflections of the 3rd light splitting surface.Green S polarized light (G mark) directly sees through this four light splitting surfaces, 23,24,21,22 back outputs.First bundle of blue S polarized light (B mark) sees through second light splitting surface 22 earlier, and then by the 21 reflection outputs of first light splitting surface, second bundle of blue S polarized light sees through the 22 back outputs of second light splitting surface then earlier by 24 reflections of the 4th light splitting surface.

From the light beam that closes 2 outgoing of light cube prism is the synthetic S polarized light of RGB, injects polarizing beam splitter 3 by whole indirect illumination imager chips 4, and illumination light is all utilized substantially, and the utility model has improved light efficiency significantly, has improved the image display brightness.

Claims

1, high light efficiency three-color light source one chip LCD projecting system, it comprises red, green, blue three light source (1r, 1g, 1b), close light cube prism (2), polarizing beam splitter (3), imager chip (4) and projecting lens (5), described red, green, blue three light source (1r, 1g, 1b) lay respectively at three sides of closing light cube prism (2), the light of output is closed light cube prism (2) and synthesizes a branch of light and inject polarizing beam splitter (3), this polarizing beam splitter (3) is isolated polarized light and is offered imager chip (4), this imager chip (4) modulates image light and penetrates from projecting lens (5) at last, it is characterized in that: at each light source and close and be provided with a polarization converter (6) between the light cube prism (2).

2, high light efficiency three-color light source one chip LCD projecting system according to claim 1 is characterized in that: the light that each light source sends all is converted to the S polarized light and enters and close light cube prism (2) behind polarization converter (6).

3, high light efficiency three-color light source one chip LCD projecting system according to claim 1 and 2, it is characterized in that: described polarization converter (6) is by two parallelogram prisms (61,63) and be clipped in equilateral right-angle triangle prism (62) in the middle of it prism that to synthesize a cross section be isosceles trapezoid, at these two parallelogram prisms (61,63) with on the faying face of equilateral right-angle triangle prism (62) be coated with the polarization spectro rete to form polarization light-dividing surface, parallelogram prism (61,63) be coated with reflective coating on the opposite side inclined-plane forming reflecting surface, also gummed has 1/2nd wave plates (64) with this bottom surface homalographic on the bottom surface of this equilateral right-angle triangle prism (62).

4, high light efficiency three-color light source one chip LCD projecting system according to claim 3 is characterized in that: described polarization converter (6) with close light cube prism (2) and compose one.

5, high light efficiency three-color light source one chip LCD projecting system according to claim 1, it is characterized in that: described red, green, blue three light sources (1r, 1g, 1b) are the led light source of respective color or LASER Light Source.

6, high light efficiency three-color light source one chip LCD projecting system according to claim 1, it is characterized in that: described imager chip (4) is the LCOS liquid crystal panel.