CN1928626A

CN1928626A - Optical element, illuminating device, and projection type video display

Info

Publication number: CN1928626A
Application number: CNA2006101288187A
Authority: CN
Inventors: 池田贵司; 前田诚
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 2005-08-31
Filing date: 2006-08-30
Publication date: 2007-03-14
Anticipated expiration: 2026-08-30
Also published as: JP4716823B2; JP2007065407A; CN1928626B

Abstract

An optical element includes a dichroic surface formed by a multilayer dielectric film or the like and a polarized beam splitter surface formed by a multilayer dielectric film or the like. The dichroic surface transmits light (G and R) from a green wavelength band to a red wavelength band irrespective of the polarization directions of light, and reflects light (B) in a blue wavelength band. The polarized beam splitter surface reflects an S-polarized light (Gs) in a green wavelength band. Furthermore, the polarized beam splitter surface transmits an S-polarized light (Bs) and a P-polarized light (Bp) in the blue wavelength band, and also transmits the S-polarized light (Rs) and P-polarized light (Rp) in the red wavelength band.

Description

Optical element, lighting device and projection type video display device

Technical field

The present invention relates to utilize the wavelength of light and the optical element of the different synthetic light of polarization, the projection type video display device that possesses the lighting device of this optical element and possess this lighting device.

Background technology

As the optical element of the synthetic light of the difference of the wavelength that utilizes light, known have cross dichroic prism and a cross dichroic mirror.And as the optical element of the synthetic light of the difference of utilizing polarization of light, known have a polarized light beam splitter.Know the projection type video display device that adopts these cross dichroic prisms and polarized light beam splitter in addition.And have the people propose a kind of wherein possess predetermined wavelength is had optionally polarization separation face, can and make the polarization separation face that the P polarized light of other wavelength coverages sees through, the color separated synthin (referring to patent documentation 1) of synthetic light with the reflection of the S polarized light of particular range of wavelengths but also possess.

1: the No. 3609715 patents of patent documentation

The general introduction of invention

Yet,, under the situation of synthetic red light, green light and blue ray, have the low situation (being described in more detail in an embodiment) of utilization ratio of green light about this point for the cross dichroic prism.And, can not synthesize light from three directions for the polarized light beam splitter.In addition, described color separated synthin can not only be used for the synthetic of color.

The present invention In view of the foregoing proposes just, purpose be to provide a kind of can be with simpler structure, utilize the two the optical element, the projection type video display devices that possess the lighting device of this optical element and possess described optical element or lighting device of different synthetic light of wavelength and polarization of light dexterously.

This optical element of the present invention, it is characterized in that it being by by making the mutually first different color light of color, the first color light and the second color light see through in the second color light and the 3rd color light, the 3rd color of light line reflection, with the lead dichroic face of specific light path of the first color light in these three kinds of color light and the 3rd color light, with first polarized light is seen through and the facial cross-over configuration of the polarized light beam splitter of second polarized light reflection is formed, by described polarized light beam splitter face with the second color light of the second polarized light described specific light path (following first optical element that in this, is called) that leads.

And this optical element of the present invention, it is characterized in that it being by by making the mutually first different color light of color, the first color light and the second color light see through in the second color light and the 3rd color light, the 3rd color of light line reflection, with the lead dichroic face of specific light path of the first color light in these three kinds of color light and the 3rd color light, with first polarized light is seen through and the facial cross-over configuration of the polarized light beam splitter of second polarized light reflection is formed, when described polarized light beam splitter face only under the situation to the second color light polarizing light beam splitter effect, when the second color light with second polarized light leads described specific light path, even the first color light and the 3rd color light second polarized light, also can see through this polarized light beam splitter face, towards described specific light path advance (following second optical element that in this, is called).

If adopt described first optical element and second optical element, can with dichroic facial with facial this simpler structure of cross-over configuration of polarized light beam splitter, the wavelength by utilizing light dexterously synthesizes light with the difference of the two of polarization.

Lighting device of the present invention, it is characterized in that it being by described first optical element, with have three of outgoing light of all kinds independently solid light source optical system or the optical system that the white light of white light source is separated into light of all kinds constituted, by means of described optical element with the light of all kinds described specific light path that leads, and utilize second polarized light about the second color light, utilize first polarized light (following this in be called first lighting device) about other two kinds of color light.

In described first lighting device, also can be on described specific light path only make the narrow wavelength coverage polarization rotation element (following this in be called second lighting device) of its polarization direction half-twist with regard to one or both specific coloured light settings.

Projection type video display device of the present invention is characterized in that it being the projection type video display device that possesses the lighting device that is made of solid light source in described first lighting device, wherein possesses:

Drive the light source drive of each solid light source pulsed illumination of described lighting device,

Switch to have by the energising conduction and cut-off and can make the polarization direction that receives light on the described specific light path be in the state of half-twist or not make its spinfunction state of switch polarization rotation element,

Receive video display board through the light of described switch polarization rotation element,

Sequential according to described solid light source pulsed illumination makes under the open/close situation of described switch polarization rotation element, can make the identical switch in polarization direction of whole coloured light,

According to the sequential of described solid light source pulsed illumination, with of all kinds with picture signal supply with described video display board display panel drive and

The projection section of projected image light.

And projection type video display device of the present invention, it is characterized in that it being the projection type video display device that possesses the lighting device that constitutes by solid light source in described first lighting device, wherein possess:

Do not have the liquid crystal type video display board of the reception of being set at from the locational light incident side polarization plates of described solid light source emergent ray,

When the first polarized light light incides on the described video display board, the video display board that the light incident side polarization direction intersects with respect to the exiting side polarization plates is used in the picture signal that generates with the polarization direction of picture signal that generates or the light incident side video display board parallel with respect to the exiting side polarization plates, drive described video display board by a picture signal, when the second polarized light light incides on the described video display board, by another picture signal drive described video display board display panel drive and

The projection section of projected image light.

And this projection type video display device, it is characterized in that it being to possess the projection type video display device that constitutes lighting device in described second lighting device by solid light source, wherein possess:

Receive video display board through described narrow wavelength coverage polarization rotation element,

According to the sequential of described solid light source pulsed illumination with of all kinds with picture signal supply with described video display board display panel drive and

The projection section of projected image light.

And lighting device of the present invention, it is characterized in that by described second optical element and have outgoing light of all kinds three independent solid light sources optical system or the optical system that the white light of white light source is separated into light of all kinds constituted,

With the light of all kinds described specific light path that leads, and utilize the second polarized light light (following this in be called the 3rd lighting device) with the second color light at least by means of described optical element relevantly.

And projection type video display device of the present invention, it is characterized in that it being the projection type video display device that possesses the lighting device that constitutes by solid light source in described the 3rd lighting device, wherein possess:

Be arranged on the video display board on the described specific light path,

The projection section of projected image light.

And projection type video display device of the present invention, it is characterized in that wherein possessing:

Described first optical element,

Be configured to such an extent that can respectively image light be supplied with three video display boards of usefulness of all kinds of three planes of light incidence of described optical element,

Have outgoing light of all kinds three independent solid light sources optical system or the white light of white light source can be separated into light of all kinds optical system and

The projection section of projected image light constitutes

Is second polarized light from the second color light with the image light of video display board outgoing, and is first polarized lights from the image light of other two video display board outgoing.

Described second optical element,

The projection section of projected image light constitutes,

From the image light of described three video display board outgoing, the second color light is second polarized light.

And lighting device of the present invention, it is characterized in that wherein

Possess described first optical element, with three illumination section of the mutual different coloured light of three kinds of colors of outgoing,

At least one illumination section is two solid light sources that possess two kinds of color light in the described three kinds of colors of outgoing, with behind synthetic described two kinds of color light from two look parts of beam projecting face outgoing, Be Controlled gets and can make described two kinds of color light are cut apart outgoing on time time cut apart illumination section

With the second color light of the second color light of facial first polarized light of will be mutually advancing with orthogonal directions of the polarized light beam splitter of described optical element and the second polarized light described specific light path that leads,

By the facial reflection of described polarized light beam splitter, the second color light of cutting apart first polarized light of illumination section outgoing from the time sees through described polarized light beam splitter face (following this be called the 4th illumination section) from the second color light of described second polarized light of an illumination section outgoing.

And projection type video display device of the present invention, it is characterized in that wherein

Possess described the 4th lighting device,

In advance single video display board is configured in the beam projecting side of optical element described in the described lighting device, cut apart according to the time and light by being cut apart other two illumination section beyond the illumination section time in the described lighting device, make three kinds of color light cut apart outgoing on time, and be partitioned into the sequential that coloured light of penetrating is lighted by the time according to described, drive described video display board by picture signal of all kinds.

In the described projection type video display device, also can possess and use LCD panel as described single video display board, the polarization direction that can make the light of all kinds that is imported into described LCD panel simultaneously on same direction consistent polarization optical element or possess can be corresponding with different polarization direction light LCD panel and display panel drive.

Projection type video display device of the present invention is characterized in that wherein

Possess described the 4th lighting device and each illumination section emergent ray modulated three video display boards of usefulness,

The sequential of cutting apart illumination according to the described time is driven with picture signal by the different color of described two kinds of colors and receives the video display board of being cut apart described two kinds of color different light rays that illumination section sends by the time described in the described lighting device.

Lighting device of the present invention is characterized in that wherein

Possess described second optical element, with three illumination section of the mutual different coloured light of three kinds of colors of outgoing,

At least one illumination section is, two solid light sources that possess two kinds of color light in the described three kinds of colors of outgoing, with behind synthetic described two kinds of color light from two look parts of beam projecting face outgoing, Be Controlled must be cut apart illumination section with described two kinds of color light are cut apart outgoing on time time

Polarized light beam splitter face with described optical element, with the second color light of the second color light of first polarized light of advancing with orthogonal directions mutually and the second polarized light described specific light path that leads, simultaneously described polarized light beam splitter face is only under the situation to the second color light polarizing light beam splitter effect, even described first color light and the 3rd color light second polarized light also can see through this polarized light beam splitter face and be directed to described specific direction

The second color light from described second polarized light of an illumination section outgoing, by the facial reflection of described polarized light beam splitter, the second color light of cutting apart first polarized light of illumination section outgoing from the described time sees through described polarized light beam splitter face (following this in be called the 5th illumination section).

Possess described the 5th lighting device,

In advance single video display board is configured in the beam projecting side of described optical element, cut apart according to the time and light by being cut apart other two illumination section beyond the illumination section time in the described lighting device, make three kinds of color light cut apart outgoing on time, and be partitioned into the sequential that coloured light of penetrating is lighted by the time according to described, drive described video display board by picture signal of all kinds.

In the described projection type video display device, also can possess the LCD panel of use as described single video display board, the polarization direction that can make simultaneously the light of all kinds that is imported into described LCD panel consistent polarization optical element on same direction, perhaps possess can be corresponding with different polarization direction light LCD panel and display panel drive.

Projection type video display device of the present invention is characterized in that

Constitute by described the 5th lighting device with to three video display boards of each illumination section emergent ray modulation usefulness,

According to the described irradiation sequential of cutting apart by the time,, drive from the described time and cut apart the video display board that illumination section receives described two kinds of color different light rays by the picture signal that the different coloured light of described two kinds of colors are used.

Lighting device of the present invention is characterized in that wherein

At least one illumination section is, the opticator that possesses two mutual different back outgoing of solid light source and the polarization direction that makes these emergent raies of two kinds of color light in the described three kinds of colors of outgoing, and with the polarized light light composite part of the synthetic back of mutual different coloured light, described two kinds of polarization directions from the outgoing of a beam projecting face, Be Controlled gets and can make described two kinds of color light are cut apart outgoing on time time cut apart illumination section

With the polarized light beam splitter face of described optical element, the described specific light path that will lead with the second color light of the second color light of first polarized light of advancing with orthogonal directions mutually and second polarized light,

The second color light from described second polarized light of an illumination section outgoing, reflected by described polarized light beam splitter face, the second color light of cutting apart described first polarized light of illumination section outgoing from the described time sees through described polarized light beam splitter face (following this in be called the 6th illumination section).

Projection type video display device of the present invention, it is characterized in that it being the projection type video display device that possesses described the 6th lighting device, wherein possesses the beam projecting side that in advance single video display board is configured in described optical element, cut apart according to the time and light by being cut apart other two illumination section beyond the illumination section time in the described lighting device, make three kinds of color light cut apart outgoing on time, and be partitioned into the sequential that coloured light of penetrating is lighted by the time according to described, drive the display panel drive of described video display board by picture signal of all kinds, and cut apart illumination section and possess the polarization direction polarization optical element of applying on first polarization direction that makes the second color light and other color light the time.

Constitute by described the 6th lighting device with to three video display boards of the light of each illumination section outgoing modulation usefulness,

Lighting device of the present invention is characterized in that wherein

Polarised light beam splitter face with described optical element; Described specific light path will lead with the second color light of the second color light of first polarised light of advancing with orthogonal direction mutually and second polarised light; Simultaneously when described polarised light beam splitter face only in the situation to the second color light polarizing light beam splitter effect; Even the described first color light and the 3rd color light second polarised light also can see through this polarised light beam splitter face; Be directed to described specific direction

The second color light from described second polarized light of an illumination section outgoing, reflected by described polarized light beam splitter face, the second color light of cutting apart first polarized light of illumination section outgoing from the described time sees through described polarized light beam splitter face (following this be called the 7th lighting device).

Projection type video display device of the present invention, it is characterized in that it being the projection type video display device that possesses described the 7th lighting device, wherein possesses the beam projecting side that in advance single video display board is configured in described optical element, light by comprising that other two illumination section that the time in the described lighting device can be cut apart beyond the illumination section were cut apart according to the time, make three kinds of color light cut apart outgoing on time, and be partitioned into the sequential that coloured light of penetrating is lighted by the time according to described, drive the display panel drive of described video display board by picture signal of all kinds.

In described projection type video display device, also can possess the LCD panel of use as described single video display board, the polarization direction that can make simultaneously the light of all kinds that is imported into described LCD panel consistent polarization optical element on same direction, perhaps possess can be corresponding with different polarization direction light LCD panel and display panel drive.

Constitute by described the 7th lighting device with to three video display boards of each illumination section emergent ray modulation usefulness,

According to the described irradiation sequential of cutting apart by the time, by the different coloured light picture signals of described two kinds of colors, driving is cut apart the video display board that illumination section receives described two kinds of color different light rays from the described time.

In sum, by means of simpler structure, utilize the two different of wavelength and polarized light of light can synthesize light dexterously, for example with regard to utilizing the light that the cross dichroic prism blocks the both sides compensated part, have and to reduce it and block the effect that degree increases light quantity.

Purpose above-mentioned and in addition of the present invention, characteristics, embodiment and advantage will become more clear by following detailed description with reference to accompanying drawing.

Description of drawings

Fig. 1 is the stereographic map of optical element in the expression embodiment of the present invention;

Fig. 2 is the vertical view of optical element among Fig. 1;

Fig. 3 is the vertical view of optical element in other embodiments of expression the present invention;

Fig. 4 is the key diagram of the characteristic of the general dichroic mirror of explanation;

Fig. 5 is the key diagram that the general dichroic mirror of expression causes the green light light quantity to reduce;

Fig. 6 is the key diagram of lighting device and projector in the expression embodiments of the present invention;

Fig. 7 is the key diagram of lighting device and projector in expression other embodiments of the present invention;

Fig. 8 is the key diagram of expression polarization conversion device (polarization optical element);

Fig. 9 is the key diagram of lighting device and projector in expression other embodiments of the present invention;

Figure 10 is the key diagram of LCD panel;

Figure 11 is the key diagram of lighting device and projector in expression other embodiments of the present invention;

Figure 12 is the key diagram of the existing projector of expression, as with Figure 11 in projector close the reference of fastening;

Figure 13 is a key diagram of understanding the effect usefulness of second kind of embodiment of the present invention;

Figure 14 is a key diagram of cutting apart luminous color state in the expression projection type video display device shown in Figure 13 by the time;

Figure 15 is the lighting device of expression second kind of embodiment of the present invention and the key diagram of projection type video display device;

Figure 16 is the lighting device of expression second kind of embodiment of the present invention and the key diagram of other examples of projection type video display device;

Figure 17 is a key diagram of cutting apart sequential that illumination section lights etc. in the projection type video display device of Figure 16 by the time.

The explanation of preferred implementation

(embodiment 1)

Below based on Fig. 1 to Figure 11 lighting device and projection type video display device in the embodiment of the present invention are described.

As shown in Figures 1 and 2, optical element 50 of the present invention, in transparent glass cube, possess: facial 50a of dichroic that constitutes by multilayer dielectric film etc. that on the divisional plane that this cube is divided into two triangular prisms, forms and the facial 50b of polarization beam splitter that constitutes by multilayer dielectric film etc. that on another divisional plane, forms.The polarization direction of the facial 50a of dichroic and light has nothing to do and can make light from the green wavelength scope to red wavelength range (G R) sees through, the light of reflection blue wavelength coverage (B).The facial 50b of polarization beam splitter, the S polarized light (Gs) of reflection green wavelength coverage (wherein the P polarized light of green wavelength scope sees through).In addition, the facial 50b of polarization beam splitter can see through the S polarized light (Bs) and the P polarized light (Bp) of blue wavelength region, also can see through the S polarized light (Rs) and the P polarized light (Rp) of red wavelength range.Will become four transparent body triangular prisms and respectively wait the two sides of avris tight mutually, thereby have hexahedral shape near the described optical element 50 of formation.

And as shown in Figure 3, optical element 51 of the present invention possesses dichroic mirror 51a that is made of multilayer dielectric film etc. and the polarization beam splitter plate 51b that is made of multilayer dielectric film etc.Dichroic mirror 51a makes light from the green wavelength scope to red wavelength range (G R) sees through, the light of reflection blue wavelength coverage (B) with the polarization direction of light is irrelevant.Polarization beam splitter plate 51b, the S polarized light (Gs) of reflection green wavelength coverage (wherein the P polarized light of green wavelength scope sees through).In addition, polarization beam splitter plate 51b can see through the S polarized light (Bs) and the P polarized light (Bp) of blue wavelength region, also can see through the S polarized light (Rs) and the P polarized light (Rp) of red wavelength range.Optical element 51 is divided into dichroic mirror 51a and polarization beam splitter plate 51b two parts respectively, and the two has cross shape making under the four partitioning portion edges situation near each other.Wherein one of dichroic mirror 51a and polarization beam splitter plate 51b are divided into two,, also may have cross shape when disposing to such an extent that this two is cut apart under page clamping the other side's the situation.

Yet, with regard to common cross dichroic mirror etc., the characteristic of its first dichroic mirror (to the reflection characteristic of wavelength), shown in the last figure of Fig. 4, light to red wavelength range has reflection characteristic, the characteristic of its second dichroic mirror (to the reflection characteristic of wavelength) shown in Fig. 4 figure below, has reflection characteristic to the light of blue wavelength region.Therefore, the green light of middle wavelength coverage, as shown in Figure 5, the part of its both sides wavelength is reflected (blocking), thereby the utilization ratio of green light is reduced.

In contrast to this, if described

optical element

50,51, then for from its three kinds of planes of light incidence respectively for coloured light of incident, facial 50a of its dichroic and dichroic mirror 51a, see through light, the light of reflection blue wavelength coverage from the green wavelength scope to red wavelength range.And facial 50b of polarization beam splitter and polarization beam splitter plate 51b then do not have the shut-off feature to coloured light.Therefore, do not block phenomenon near long partly can not the generation of red light one side wave in the light of green wavelength scope, thereby the utilization ratio of green light is improved.

If adopt the lighting device of described optical element 50 or optical element 51, can make the light of all kinds (being image light of all kinds in projector described later) that is unified into the S polarized light to single oppositely (specific light path) outgoing.Wherein, when coloured light that each color light source (solid light source) is sent direct (polarization direction inconsistently) gives under the situation of described optical element 50 (51), with regard to red light and blue ray, also can make its P polarized light to described specific light path outgoing.After the coloured light that utilizes polarization conversion device (polarization optical element) that each color light source (solid light source) is sent fitly becomes the S polarized light, supply with under the situation of described optical element 50 (51), can make the light of all kinds that is unified into the S polarized light to single direction (specific light path) outgoing.After fitly becoming the S polarized light, the coloured light that utilizes polarization conversion device that green light source (solid light source) is sent supplies with described optical element 50 (51), the coloured light that utilizes polarization conversion device that red light source and blue-light source (solid light source) are sent is simultaneously supplied with under the situation of described optical element 50 (51) after fitly becoming the P polarized light, can make green light, make the specific light path outgoing of other color of light alignments with the P polarized light with the S polarized light.

Wherein, adopt general (no matter region how) polarization beam splitter to replace under the situation of facial 50b of polarization beam splitter and polarization beam splitter plate 51b, itself be the green light of S polarized light and itself be that other color light of P polarized light can be to specific light path outgoing.These optical elements are also included within the application's the invention.About optical element 51 also is same.Sometimes give label symbol 50 ' for this optical element.

Below whole for light of all kinds, will be called the A type with the lead type of specific light path of S polarized light state.And the lead situation of 3 of described optical elements of non-modulation light is called A type lighting device, the situation that will modulate 3 of the described optical elements of light (image light of all kinds) guiding is called 3 plate A type projector.In addition, the type with the specific light path that under S polarized light and the P polarized light mixing existence light of all kinds led is decided to be Type B.The lead situation of described optical element of just non-modulation in addition light is called the Type B lighting device, and the situation that will modulate the described optical element of light (image light of all kinds) guiding is called 3 template Type B projector.

Fig. 6 is the key diagram of expression 3 plate A type projector one example.From the light of green solid light source (for example green LED) 1G outgoing, integrate and dispersion angle reduces back guiding green LCD panel 3G through conical guide rod 2 light.Wherein in this example, tinsel net form polarization beam splitter (polarization optical element) is arranged under the situation of beam projecting side of conical guide rod 2, only makes the outgoing of predetermined polarisation light.Certainly, also can adopt the polarization conversion device that constitutes by the polarization beam splitter matrix.The situation of other colour light source systems too.Through the modulation light (S polarized light) that obtains behind the LCD panel 3G, be polarized and be directed to projecting lens 5 after the facial 50b of beam splitter reflects.From the light of blue solid light source (for example blue led) 1B outgoing, integrate and dispersion angle is directed to the blue LCD panel 3B that uses after reducing through conical guide rod 2 light.Through the modulation light (S polarized light) that obtains behind the LCD panel 3B, be directed to projecting lens 5 by the facial 50a reflection of dichroic mirror and after seeing through the facial 50b of polarization beam splitter.From the light of red solid light source (for example red LED) 1R outgoing, made light by conical guide rod 2 and integrate and dispersion angle is reduced, and then by light path change prism 4 with more revolutionary 90 ° of light path after, be directed to the red LCD panel 3R that uses.Through the modulation light (S polarized light) that obtains behind the LCD panel 3R, behind the facial 50a of dichroic mirror, again through being directed to projecting lens 5 behind the facial 50b of polarization beam splitter.

In the existing liquid crystal projection apparatus, green is arranged on the position with the projecting lens opposite with LCD panel, obtain considering under the situation of white light of color balance that the light quantity of green light is with respect to the light amount ratio of required light of all kinds relative deficiency often.In case with regard to green light, utilize described light path change prism 4 to carry out the light path change, its light quantity is further reduced.If 3 template A type projector shown in Figure 6 are then with regard to green light, owing to carrying out the light path change by described light path change prism 4, so can prevent the reduction of its light quantity.And about the situation beyond the green light, owing to utilize described light path change prism 4 to carry out the light path change, so can enjoy the advantage of using the miniaturization that this light path change prism 4 brings.

Here suppose that whole light quantities depend on described green light.Test compares the light quantity of projector among existing program (utilizing the scheme of the synthetic light of all kinds of dichroic prism) and last note Fig. 6.At first, the light utilization ratio (efficient made in following brief note) of leading excellent integraph mensuration is decided to be η rod, the efficient of projecting lens 5 is decided to be η PL, the total efficiency of LCD panel 3 and polarization plates thereof is decided to be η LCD, these key elements are identical in the formula of two kinds of situations.Then, the reflectivity that light path is changed prism 4 is decided to be η m, and the transmitance of dichroic prism (having) is decided to be η D, and the reflectivity of the facial 50b of polarization beam splitter is decided to be η GP.Numerical approximation about last note η m, η D, η GP is respectively η m ≈ 0.9, η D ≈ 0.99, η GP ≈ 0.99.Wherein the amount of emitted light with light source 1 is decided to be L, if will obtain the light quantity that arrives screen, then the efficiency eta C of existing program and efficiency eta n of the present invention are calculated as follows.

ηC＝ηPL×ηLCD×ηrod×ηm×ηD×L

ηn＝ηPL×ηLCD×ηrod×ηm×ηGP×L

ηn/ηC＝ηGP/(ηm×ηD)≈1.1

Therefore screen of the present invention is brighter.

Wherein 3 template A type projector are not limited to possess note light path change prism 4.

About three template Type B projector, also can make and have and the projector with spline structure shown in Figure 6.And, when green image is the S polarized light, when other images are the P polarized light, for example also can adopt and only to make the narrow wavelength coverage polarization rotation element of polarization direction half-twist be arranged on the locational structure of light light incident side of projecting lens 5 green wavelength light.When certain coloured light line is first polarized light, and other two kinds of color light are under the situation of second polarized light, also can be provided with at the narrow wavelength coverage polarization rotation element of described certain coloured light line or at the narrow wavelength coverage polarization rotation element of other two kinds of color light.3 template Type B projector wherein also are not limited to possess described light path change prism.

Fig. 7 is the key diagram that time-division driving type of projector one example of Type B projection arrangement is adopted in expression.By the green light of green solid light source 1G outgoing, be polarized converting means 103S and be transformed into the S polarized light.By the red light of red solid light source 1R outgoing, be polarized converting means 103P and be transformed into the P polarized light.By the blue ray of blue solid light source 1B outgoing, be polarized converting means 103P and be transformed into the P polarized light.Each light source 1G, 1R, 1B are driven by the time by LED lighting circuit 123 with cutting apart.π assembly (switch polarization rotation element) 105 is configured in the beam projecting side of leading excellent integraph 104.Described π assembly 105 for example has in LCD panel and the suitable structure of structure except that polarization plates, by power-on switch is opened or closed, can and not switch between the rotation status at the state that makes the polarization direction half-twist that receives light.For example, under the state (the P polarized light is supplied with the state of π assemblies 105 through leading excellent integraph 104) that light source 1B or light source IB light, π assembly 105 is transformed into the S polarized light with the P polarized light that receives.On the other hand, under the state (the S polarized light is supplied with the state of π assembly 105 through leading excellent integraph 104) that light source IG lights, can apply voltage (energising) to π assembly 105.At this moment, π assembly 105 can make the S polarized light of reception directly see through.That is to say, utilize π assembly 105 P polarized light and a kind of polarized light in the S polarized light from light source of all kinds can be unified into another kind of polarized light (being the S polarized light under the above-mentioned situation).

Polarization conversion device 103S as shown in Figure 8, is made of polarization beam splitter array (below be called the PBS matrix).Each polarization separating film in this PBS matrix for example makes the P polarized light pass through in the light that light source 1 sends, and the light path of S polarized light is changed 90 °.The S polarized light that light path is changed is by the directly outgoing of adjacent polarization separating film (perhaps reflectance coating) reflection back.On the other hand, see through the P polarized light of polarization separating film, polarizer (the 1/2 λ plate) 103a that is set at its front side (beam projecting side) is transformed into outgoing behind the S polarized light.That is to say that almost whole in this case light all are transformed into the S polarized light.Wherein, polarization beam splitter is made of so-called mesh-like polarization plates and polarization separation multilayer film etc.And polarization conversion device 103P also can be in the position of polarizer (1/2 λ plate) 103a in polarization conversion device 103S.Wherein for the polarization beam splitter in the optical element 50 ' is facial, can be about to become the light of P polarized light in advance to its supply by the polarization conversion device 103P that red light source 1B uses.Equally, for the polarization beam splitter in the optical element 50 ' is facial, can be about to become the light of P polarized light in advance to its supply by the polarization conversion device 103P that blue-light source 1B uses.

LCD panel 3F is a kind of LCD panel of infiltration type.The light incident side polarization plates of LCD panel 3F can make the S polarized light see through.LCD panel 3F can drive with lcd driver 122.And each

light source

1R, 1G, 1B are got 120 ° of its mutual phase deviations by LED lighting circuit 123 pulsed drive.And these lcd drivers 122, LED lighting circuit 123, π assembly on-off circuit 121 are controlled by control circuit 124.Though show π assembly 105 as the switch polarization rotation element, be not limited to this.And, though be with P polarized light and S polarized light be unified into the two one of, be not limited to its be unified into the two one of, also the polarization direction from source light of all kinds can be unified.For example, be under 45 ° the situation when the light incident polarization direction of LCD panel, can not adopt one of P polarized light and S polarized light unified method, for example between π assembly 105 and optical element 50 ', dispose half-wave plate and adopt, it is unified into the light that has with described 45 ° of corresponding polarization directions.

Have and the projector of structure shown in Figure 7 about adopting the time-division driving type projector of A type lighting device, can making with spline structure.In this case, especially need not π assembly 105 and π assembly on-off circuit 121.Wherein, for the polarization beam splitter in the optical element 50 was facial, the polarization conversion device that can use from red light source 1B was in advance supplied with the light that is about to become the S polarized light.Equally, for the polarization beam splitter in the optical element 50 was facial, the polarization conversion device that can use from blue-light source IB was in advance supplied with the light that is about to become the S polarized light.

Wherein in the time-division driving type projector that adopts Type B lighting device shown in Figure 7, by from optical element 50 ' to narrow wavelength coverage polarization rotation element being set, can making the structure that need not π assembly 105 and π assembly on-off circuit 121 between the LCD panel 3F.

Fig. 9 is the key diagram that time-division driving type projector one example of Type B lighting device has been adopted in expression.From the green light of green light source 1G outgoing, be polarized converting means 103S and be transformed into the S polarized light.From the red light of red light source 1R outgoing, be polarized converting means 103P and be transformed into the P polarized light.From the blue ray of blue-light source 1B outgoing, be polarized converting means 103P and be transformed into the P polarized light.So this projector possesses LCD panel 3F '.

Figure 10 represents the structure of general normally white LCD panel 3X.The incident polarization plate 3Xa of this LCD panel 3X and outgoing polarization plates 3Xb are configured to such an extent that make the direction of principal axis of light transmission differ from 90 ° mutually.When energising is in and closes to the pixel of this LCD panel 3X, incident ray since its polarization direction be transformed 90 ° after from outgoing polarization plates 3Xb outgoing, so show that will become white shows.Otherwise, when the energising to described pixel is switched on, because the polarized light of incident ray does not produce rotation, so incident ray can not see through outgoing plate polarization plates 3Xb, so demonstration will become black display.

The structure of described LCD panel 3F ' is suitable with the structure of removing among the described LCD panel 3X after the light incident side polarization plates.And, lcd driver 122, according to alternately (between P polarized light and the S polarized light alternately) sequential of light source luminescent of all kinds, the picture signal when LCD panel 3F ' is considered as normally white is supplied with, and switches between the signal supply of LCD panel 3F ' when being considered as common-black type.That is to say lcd driver 122, when the polarized light light of first direction during to LCD panel 3F ' incident, the LCD panel that light incident side polarization direction and exiting side polarization plates are intersected is supplied with to LCD panel 3F ' with one of signal in the picture signal that generates with picture signal that generates or the light incident side polarization direction LCD panel parallel with the exiting side polarization plates, when the polarized light light of second direction will be to LCD panel 3F ' incident, described LCD panel is supplied with another picture signal on the other hand.

Below more specifically illustrate.Wherein in the following description, the exiting side polarization plates of LCD panel 3F ' is decided to be the S polarized light is seen through.Red light source 1R is being lighted in the sequential of outgoing P polarized light, lcd driver 122 is supplied with the Chang Baiyong red image signal to LCD panel 3F '.When the picture signal that will be equivalent to 100% redness is supplied with LCD panel 3F ' (when the energising of LCD panel 3F ' pixel is closed), incide the P polarized light among the LCD panel 3F ', owing to being transformed 90 °, its polarization direction becomes the S polarized light, so can see through described exiting side polarization plates, demonstration will be 100% red demonstration.Blue-light source 1B is lighted with on remember the same control of row into.On the other hand, green light source 1G is being lighted in the sequential that makes the outgoing of S polarized light, lcd driver 122 is supplied with the normal black picture signal of using to LCD panel 3F '.In the time of will being equivalent to 100% green video signal supply LCD panel 3F ' (when the energising of LCD panel 3F ' pixel is opened), incide the S polarized light among the LCD panel 3F ' and can not see through described exiting side polarization plates owing to do not produce rotation, demonstration will be 100% green demonstration.

That is to say, if projector shown in Figure 9, the sequential that can utilize lcd driver 122 to light then according to light source 1, between supplying with and often deceive with the picture signal supply, the Chang Baiyong picture signal switches, owing to these two kinds of picture signals can be supplied with LCD panel 3F ', can realize also that without π assembly 105 image shows.

Be polarized the situation of the facial reflection of light beam splitter though green light wherein mainly has been described in the above description, be not limited to this situation.Also can reflect the low coloured light of outgoing light quantity in the three primary colors light with polarized light beam splitter face.And, though what illustrate is the example that has adopted the infiltration type video display board, also can use reflection-type video display board (reflective liquid crystal display board, DMD (digital micro mirror device) etc.) (in circle frame among Fig. 9).

Figure 11 is the attempting of three-plate type color liquid crystal projection optical system example that expression possesses the white light source color separated system of this embodiment.The luminous component of light source 2000 is made of extra-high-pressure mercury vapour lamp, methine halide lamp, xenon lamp etc., and its irradiation light forms outgoing behind the parallel beam by parabolic mirror, guiding integration lens 201.

Integration lens 201 is made of a pair of fly lens, and each lens in a pair of lens can both be with the light from light source 200 outgoing, guiding liquid crystal light valve 211,212,213 comprehensively on.Through the light of integration lens 201, just with behind the device be directed to first dichroic mirror 203 through the polarization that constitutes by polarized light beam splitter array.

First dichroic mirror 203 can be through the light in red wavelength zone, the light of reflection blue (green+cyan) wavelength region may.See through the light in the red wavelength zone of first dichroic mirror 203, after catoptron 204 reflections, change light path.The red light that the mirror 204 that is reflected reflects, through behind the convergent lens 208, modulated with permeation type liquid crystal light valve 211 because of seeing through red light.On the other hand, the light by the blue wavelength region of first dichroic mirror, 203 reflections is directed to second dichroic mirror 205.

Second dichroic mirror 205, the light of reflection blue wavelength region may sees through the light of green wavelength region.By the light of the blue wavelength region of second dichroic mirror, 205 reflections, through behind the convergent lens 209, be directed to blue ray with permeation type liquid crystal light valve 212, modulated because of seeing through it.And see through the light of the green wavelength region of second dichroic mirror 205, and behind catoptron 206,207 and convergent lens 210, be directed to the look green light rays with permeation type liquid crystal light valve 213, modulated because of seeing through it.

Each liquid crystal light valve 211,212,213 is by possessing the incident polarization plate, enclose display board part and the exiting side polarization plates formation that liquid crystal constitutes between a pair of glass substrate (forming pixel electrode and alignment films uses).Through 211,212,213 o'clock modulated modulation light (versicolor image light) of liquid crystal light valve, after synthesizing, optical element 50 (51) forms coloured image light.This coloured image light is behind projecting lens 215 enlarging projections, and Projection Display is on screen.

What Figure 12 illustrated as a reference is the optical system that possesses the three-plate type color liquid crystal projector of existing structure white light source color separated system.Difference between Figure 11 and Figure 12 is: second dichroic mirror, 205 reflection blue light in the liquid crystal projection apparatus of Figure 11 and see through green light, by comparison, second dichroic mirror 205 ' in the liquid crystal projection apparatus of Figure 12, then reflection green light and see through blue ray; And the image compound component in the liquid crystal projection apparatus of Figure 11 is

optical element

50,51 and 50 ', and the image compound component in the liquid crystal projection apparatus of Figure 12 is a dichroic prism 214 by comparison.In liquid crystal projection apparatus shown in Figure 11, also can adopt the same technology of employing technology in the liquid crystal projection apparatus with Fig. 6.

(embodiment 2)

Below based on Figure 13 to Figure 17 second kind of embodiment of the present invention is described.Wherein Figure 13 and Figure 14 are not the figure (be projection type video display device shown in Figure 13, do not have optical element 50,51) of second kind of embodiment of expression itself, but understand the reference diagram that second kind of embodiment function used.At first, Figure 13 and Figure 14 are described.

Figure 13 represents lighting device 510A and possesses lighting device 510A projection type video display device 511A.Described lighting device 510A possesses three

illumination section

510X, 510Y and the 510Z of outgoing different colours

light.Illumination section

510X, 510Y and 510Z are configured to such an extent that its optical axis is parallel to each other or parallel substantially in advance, with coloured ray cast on not shown screen.

Illumination section 510X possesses solid light source (for example green LED) 1G, conical guide pillar 502, the polarization conversion device (polarization optical element) 504 of outgoing green light and adjusts distance cylinder 506.Light from solid light source 1G outgoing, through conical guide pillar 502 integrations with after reducing dispersion angle, and then be polarized converting means 504 modulate the polarization direction at same direction unanimity (one of P polarized light or S polarized light), by being directed to the green LCD panel 3G that uses behind the described cylinder 506.Wherein, at the back segment of adjusting apart from cylinder 506 the integration guide pillar that the illumination homogenization is used can be set also.

Illumination section 510Z possesses solid light source (for example blue led) 1B, conical guide pillar 502, the polarization conversion device (polarization optical element) 504 of outgoing blue ray and adjusts distance cylinder 506.Light from solid light source 1B outgoing, through conical guide pillar 502 integrations with after reducing dispersion angle, and then be polarized converting means 504 modulate the polarization direction at same direction unanimity (one of P polarized light or S polarized light), by being directed to the blue LCD panel 3B that uses behind the described cylinder 506.

Illumination section 510Y possesses solid light source (for example red LED) 1R, conical guide pillar 502, polarization conversion device (polarization optical element) 504 and dichroic prism (also can the be dichroic mirror) 507A of outgoing red light.In addition, illumination section 510Y also possesses solid light source (for example green LED) 1G ' of outgoing green light, the conical guide pillar 502 that green light is used, polarization conversion device (being with the polarization optical element of polarized light in same direction unanimity behind the light of reception side) and the adjustment distance cylinder 508 that green light is used.That is to say, illumination section 510Y, two the solid light source 1G ' and the 1R that possess two kinds of mutual different light rays of color of outgoing (being green light and red light in this example), by means of described dichroic prism 507A with the synthetic back of two kinds of mutual different light rays of color (green light and red light) from the outgoing of a beam projecting face.And the control of the mutual different light rays of described two kinds of colors is partitioned into and penetrates (following usually illumination section 510Y is called time cut apart illumination section Y) by the time.Wherein, also can substitute polarization conversion device 504 ' with polarization conversion device 504.But also can use reflection type polarizer (silk screen) to substitute polarization conversion device 504 '.In addition, the shape of described polarization conversion device 504 (structure) is not limited to the note shape.These situations in other following examples too.

From the green light of illumination section 510X outgoing, behind green light usefulness permeation type liquid crystal display board 3G, can obtain green image light (modulation light).Green image light is through projecting on the not shown screen behind the projecting lens 505.The solid light source 1G of outgoing green light is lighted all the time.

From the blue ray of illumination section 510Z outgoing, behind blue ray usefulness permeation type liquid crystal display board 3B, can obtain blue image light (modulation light).Blue image light is through projecting on the not shown screen behind the projecting lens 505.The solid light source 1B of outgoing blue ray is lighted all the time.

Cut apart among the illumination section Y in the time, when solid light source 1R is lighted, conical guide pillar 502 reduces dispersion angle after with red light linear light integration, its polarization direction and then be polarized that converting means 504 is consistent to become same direction (P polarized light or S polarized light) is directed to LCD panel 3R after seeing through two prism 507A.At this moment, red image signal is transfused to LCD panel 3R.Can obtain red image light (modulation light) like this.Red image light is projected lens 505 and is projected on the described screen.On the other hand, when solid light source 1G ' is lighted, conical guide pillar 502 reduces dispersion angle after with green light linear light integration, and then by behind the distance adjustment guide pillar 508, its polarization direction is polarized that converting means 504 ' is consistent to become same direction (P polarized light or S polarized light), is directed to LCD panel 3R after two prism 507A reflection.At this moment, green video signal is transfused to LCD panel 3R.Can obtain green image light (modulation light) like this.Green image light is projected lens 505 and is projected on the described screen.

As mentioned above, cut apart among the illumination section Y in the time, when solid light source 1R not being lighted, and utilize the time to cut apart under the situation that solid light source 1G ' is lighted, the light quantity of green light among this projection type video display device 511A (perhaps lighting device 510A) is increased.In Figure 14 (a), expression will be cut apart the situation that red light (R) among the illumination section Y and green light (G) are alternately lighted the time.And in Figure 14 (b), the image light (predetermined situation of carrying out white demonstration) of expression projection type video display device 511A projection, this image light when green light is lighted in described light source 1G ' (when non-red light is lighted) will become cyan, and (non-green light source is lighted) will become white when described red light is lighted.Wherein, make this white have red tone somewhat, can carry out all white and show by the light quantity of adjusting red light.

Wherein in the projection type video display device 511A of last note structure, polarized light beam splitter 507B also can be set, to replace two prism 507A.In this case, polarization conversion device 504 ' can be configured the green light that can generate the S polarized light with regard to described polarized light beam splitter 507B.And, red with polarization conversion device 504, with regard to described polarized light beam splitter 507B, can be configured the red light that can generate the P polarized light.Adopt under the situation of described polarized light beam splitter 507B, for example, the narrow wavelength coverage polarization rotation foresight (300) that the polarization direction half-twist that can make S polarized light light (green light) forms P polarized light light is set in advance in the beam projecting side of described polarized light beam splitter 507B.Wherein, under the situation that makes light source 1G ' and light source 1R into, need not described narrow wavelength coverage polarization rotation foresight (300), perhaps dispose narrow wavelength coverage polarization rotation foresight (300) so that make the polarization direction half-twist of S polarized light light (red light) form the P polarized light.And, the outgoing image light is being made under the situation of equidirectional polarized light, in the projection type video display device that adopts the polarization screen, can realize high brightness.

Perhaps also π assembly (switch polarization rotation element) (301) can be arranged on the beam projecting side of described polarized light beam splitter 507B.Described π assembly for example is to have the structure suitable with removing the structure of polarization plates in LCD panel, utilizes the switch of energising making the polarization direction that receives light at the state of half-twist with do not switch between the rotation status.For example under the situation that light source 1R is lighted, the π assembly is not applied voltage (power-on switch cut-out).At this moment, the π assembly can be transformed into the S polarized light with the P polarized light that receives.On the other hand, under the situation that light source 1G ' is lighted, the π assembly is applied voltage (power-on switch is opened).At this moment, the π assembly can make the S polarized light of reception directly see through.That is to say, utilize the π assembly, can be unified into a kind of polarized light cut apart one of the P polarized light of illumination section and S polarized light from the time.

Also can adopt LCD panel 3R ' to replace LCD panel 3R.The structure of this LCD panel 3R ' is equivalent to remove among the described LCD panel 3R structure (referring to Figure 10) after the light incident side polarization plates.And not shown lcd driver, according to alternately (between P polarized light (red light) and the S polarized light (green light) alternately) of light source luminescent of all kinds alternately (replacing between P polarized light and the S polarized light) sequential according to light source luminescent of all kinds, picture signal when LCD panel 3R ' is considered as normally white is supplied with, and the signal of LCD panel 3R ' when being considered as common-black type switches between supplying with.

Below more specifically illustrate.Wherein in the following description, the exiting side polarization plates of LCD panel 3R ' is decided to be the S polarized light is seen through.Red light source 1R is being lighted in the sequential of outgoing P polarized light, lcd driver is supplied with the Chang Baiyong red image signal to LCD panel 3R '.In the time will being equivalent to 100% red image signal and supplying with LCD panel 3R ' (to the power-off of LCD panel 3R ' pixel time), incide the P polarized light on the LCD panel 3R ', owing to being transformed 90 °, its polarization direction becomes the S polarized light, so can see through described exiting side polarization plates, demonstration will be 100% red demonstration.On the other hand, green light source 1G ' is being lighted in the sequential that makes the outgoing of S polarized light, lcd driver is supplied with the normal black picture signal of using to LCD panel 3R '.In the time of will being equivalent to 100% green video signal supply LCD panel 3R ' (when LCD panel 3R ' pixel power-on switch is opened), incide the S polarized light among the LCD panel 3R ' and can not see through described exiting side polarization plates owing to do not produce rotation, demonstration will be 100% green demonstration.

And following will describing to second kind of embodiment.Figure 15 is the key diagram of the projection type video display device 511B that relates to of second kind of embodiment of expression.This projection type video display device 511B, itself and relative three permeation type liquid

crystal display board

3G, 3R, the 3B of disposing of three planes of light incidence of above-mentioned optical element 50 (perhaps optical element 51).That is to say that projection type video display device 511B has the structure that illumination section 510X shown in Figure 13,510Y, 510Z and optical element 50 (perhaps optical element 51) are made up.Certainly, also can adopt optical element 50 ' to replace

optical element

50,51.

In projection type video display device 511B shown in Figure 15, illumination section 510X possesses in this example and leads excellent integraph 509, utilizes conically to lead after rod 502 will further make the light integration through the green light of light integration the LCD panel that leads 3G.Illumination section 510Y possesses in this example and leads excellent integraph 509, utilizes conically to lead after rod 502 will further make the light integration through the green light of light integration or red light the LCD panel that leads 3R.Illumination section 510Z possesses in this example and leads excellent integraph 509, utilizes conically to lead after rod 502 will further make the light integration through the blue ray of light integration the LCD panel that leads 3B.

Wherein, green light from illumination section 510X is directed to LCD panel 3G with predetermined polarization state, through the green image light (S polarized light) that obtains behind this LCD panel 3G, be polarized and be directed to projecting lens 5 after the facial 50b of light beam splitter reflects.Illumination section 510X lights all the time.Blue ray from illumination section 510Z is directed to LCD panel 3B with predetermined polarization state, through the blue image light (S polarized light or P polarized light) that obtains behind this LCD panel 3B, by the facial 50a reflection of dichroic back guiding projecting lens 5.Illumination section 510Z lights all the time.

When the light source 1G ' that will cut apart illumination section 510Y the time lights, can supply with the picture signal that green light is used to LCD panel 3R.If green light is for example with the station guide LCD panel 3R of S polarized light, and then the red light of cutting apart illumination section 510Y from the time also is directed to LCD panel 3R (seeing aftermentioned for details about the situation that adopts polarized light beam splitter 507B) with the state of S polarized light.At this moment, the picture signal that red light can be used is supplied with LCD panel 3R.Green light (green image light) after modulation is under the situation of S polarized light, owing to can not see through optical element 50, so for example with the beam projecting side of above-mentioned π arrangement of components at LCD panel 3R, sequential according to described light source 1G ' lights is transformed into the P polarized light with the green light after the modulation.And, the narrow wavelength coverage polarization rotation element that only makes the polarization direction half-twist of green light can also be configured in the beam projecting side of LCD panel 3R.Green light (green image light) after modulation is under the situation of P polarized light, can see through optical element 50.Green image light and red image light through LCD panel 3R obtains behind facial 50a of dichroic and the facial 50b of polarized light beam splitter, are directed to projecting lens 5.

Here can consider will be synthetic from coloured light (time is cut apart the light of lighting) of LED of all kinds with common dichroic prism (referring to the dichroic prism 214 of Figure 12).Wherein,, the electric current under 50% load can be decided to be two times, make light quantity reach 1.5 times as by the bright condition of time cut-point.In this case, from the ratio of the light quantity of the light of all kinds of described dichroic prism outgoing, R under the situation: G: B=1 simply: 1: 1.During then for example as the green light deficiency, in case the number of green LED is increased to two times, the light quantity of green light will increase about 1.5 times.In this case, the ratio from the light quantity of the light of all kinds of described dichroic prism outgoing will become R: G: B=1: 1.5: 1.And, as shown in figure 15, except green light from Lighting Division 510X, with above-mentioned optical element 50 synthetic from the time when cutting apart the red light of Lighting Division 510Y and green light, be R: G: B=0.75 from the ratio of the light quantity of each coloured light of optical element 50 outgoing: 1.75: 1.When red LED, green LED and blue led is under the situation of same size chip, and for example the ratio of its light quantity usually becomes R: G: B=5: 4: 1.In case with this LED group and last note optical element 50 combinations, the actual light quantity that obtains will become R: G: B=0.75 * 5: 1.75 * 4: 1 * 1 ≈ 3.75: 7: 1.

Among the described projection type video display device 511B, when adopting described optical element 50 ' to replace under the situation of above-mentioned optical element 50, the blue image light that can make the P polarized light is in advance from LCD panel 3B outgoing.And, can make the green image light of P polarized light and red image light in advance from LCD panel 3R outgoing.In this case, inevitable different from the polarization direction of the image light of all kinds of optical element 50 ' outgoing.

Cut apart among the illumination section 510Y in the time, when adopting polarized light beam splitter 507B to replace under the situation of dichroic prism 507A, described narrow wavelength coverage polarization rotation element (300) is configured on the anterior locations etc. of LCD panel 3R, can makes the green light that is radiated on the LCD panel 3R identical with red light.Certainly, under the situation that possesses described π assembly (301), can make the green light that is radiated on the LCD panel 3R identical with red light.

In projection type video display device 511B, also can adopt the video display board (DMD etc.) of reflection-type to replace

LCD panel

3G, 3R, 3B (in the round frame referring to Figure 15).If the video display board of this reflection-type is no matter the polarization direction type then often has an advantage that need not π assembly and narrow wavelength coverage polarization rotation element.

Figure 16 is the key diagram of expression lighting device 510C and projection type video display device 511C.This projection type video display device 511C is a single panel type.Lighting device 510C is made of the above-mentioned optical element 50 (perhaps also can be the optical element 51 of cross shape) of above-mentioned

illumination section

510X, 510Y, 510Z and hexahedral shape.Make that illumination section 510X is relative with illumination section 510Z to be disposed to such an extent that the side of described optical element 50 is clamped, and will cut apart illumination section 510Y and guide pillar integraph 509 disposes to such an extent that the another side of optical element 50 is clamped in opposite directions by the time.Having disposed guide pillar integraph 509 sides, is the exit facet of optical element 50, and other three faces are planes of light

incidence.Illumination section

510X, 510Y, 510Z can be by the time division driving.And, pressed the LCD panel 3F of time division driving in advance in the beam projecting side configuration of guide pillar integraph 509, projecting lens 5 projections are through the light of LCD panel 3F modulation.

As shown in figure 17, with in during each of a hardwood period three five equilibrium, illumination section 510X (1G lights with the light source) → time of lighting is cut apart illumination section 510Y and lights (light source 1G ', 1R are bright by the time cut-point) → illumination section 510Z and light (light source 1B lights) → illumination section 510X and light (1G lights with light source) for example ... carrying out batch (-type) so repeatedly lights.For example when light source 1G is closed or before closing slightly, 1G ' lights with light source; When light source 1G ' is closed or before closing slightly, 1R lights with light source; When light source 1R is closed or before closing slightly, 1B lights with light source; When light source 1B is closed or before closing slightly, 1G lights with light source.

LCD panel 3F utilizes green video signal to carry out the state of light modulation, proceeds after light source 1G closes, the projection state that utilizes the green light of light source 1G ' can keep green image light.Wherein, owing to can obtain the peak value light of light source 1G and the peak value light of light source 1G ',, light quantity is further increased so compare with the situation of lighting the time intermittence of simple prolongation light source 1G.

Even wherein put bright light source 1G and light source 1G ' simultaneously, also need to make its polarization direction different mutually, so in LCD panel 3F, can not utilize the green light of two light sources.But, when adopting digital micromirror device (DMD) for example etc. to replace under the situation of LCD panel 3F (in the round frame referring to Figure 16), because regardless of the polarization direction, so also can put the control of bright light source 1G and light source 1G ' simultaneously.

Wherein in projection type video display device 511C, also can adopt note optical element 50 '.And in lighting device 510C, replace with polarized light beam splitter 507B under the situation of dichroic prism 507A, must from the time cut apart illumination section 510Y light source 1G ' outgoing green light be transformed into the S polarized light.Itself be the green light of S polarized light owing to can not see through optical element 50, so after should green light being transformed into the P polarized light with for example π assembly and narrow wavelength coverage polarization rotation element, again with this green light guiding optical element 50.And can change configuration light source 1G ' and light source 1R into.Change under the situation of configuration light source 1G ' and light source 1R, the green light of cutting apart light source 1G ' outgoing among the illumination section 510Y can be transformed into the P polarized light.

Though adopted polarization conversion device 504 in the above explanation, also can use polarization conversion device 103S, 103P.And, though explanation is by the situation of light source 1G and light source 1G ' outgoing green light, be not limited to this.Also can be with the low coloured light of two light source outgoing outgoing light quantity in three primary colors light, penetrate one of them and be partitioned into by the time with other color light.

Though the present invention utilizes accompanying drawing to be described in detail, use figure and embodiment just to explanation the present invention, obviously be not subjected to its any restriction.Main points of the present invention and scope are limited by appended claim only.

Claims

1. an optical element is characterized in that,

Form by dichroic face and the facial cross-over configuration of polarized light beam splitter,

Described dichroic face, in the color different mutually first color light, the second color light and the 3rd color light, by the first color light and the second color light are seen through, the 3rd color of light line reflection is with the first color light in these three kinds of color light and the 3rd color light specific light path that leads;

Described polarized light beam splitter face sees through first polarized light in first polarized light of polarization direction mutually orthogonal and second polarized light, the reflection of second polarized light,

Wherein, by described polarized light beam splitter face with the second color light of the second polarized light described specific light path that leads.

2. an optical element is characterized in that,

Facial cross-over configuration facial by dichroic and the polarized light beam splitter forms,

Described dichroic face, the first color light and the second color light see through in the color mutually different first color light, the second color light and the 3rd color light by making, the 3rd color of light line reflection, with the first color light in these three kinds of color light and the 3rd color light specific light path that leads

When described polarized light beam splitter face only to the second color light polarizing light beam splitter effect, with the second color light of the second polarized light described specific light path that leads, even and the first color light and the 3rd color light second polarized light, also can see through this light beam splitter face that shakes, advance towards described specific light path.

3. a lighting device is characterized in that,

By the described optical element of claim 1 and have three of outgoing light of all kinds independently the optical system of solid light source or the optical system that will be divided into light of all kinds from the white light of white light source constitute,

With the light of all kinds described specific light path that leads, and utilize second polarized light by means of described optical element, utilize first polarized light about other two kinds of color light about the second color light.

4. according to the described lighting device of claim 3, it is characterized in that,

On described specific light path, only one or both specific coloured light settings are made the narrow wavelength coverage polarization rotation element of its polarization direction half-twist.

5. a projection type video display device is characterized in that,

Be the projection type video display device that in the described lighting device of claim 3, possesses the lighting device that constitutes by solid light source,

This projection type video display device possesses:

Switch functional status or the non-spinfunction state of switch polarization rotation element that makes the polarization direction that receives light on the described specific light path be in half-twist according to the conduction and cut-off of energising,

Sequential according to described solid light source pulsed illumination makes described switch polarization rotation element ON/OFF make the switch of the polarization direction unanimity of whole coloured light,

The projection section of projected image light.

6. a projection type video display device is characterized in that,

Be the projection type video display device that possesses the lighting device that is made of solid light source in the described lighting device of claim 3, this projection type video display device possesses:

When the first polarized light light incides on the described video display board, use in the picture signal that generates with the polarization direction of picture signal that generates or the light incident side video display board parallel at the video display board that the polarization direction of light incident side intersects with respect to the polarization plates of exiting side with respect to the polarization plates of exiting side, picture signal by the either party drives described video display board, when the second polarized light light incides on the described video display board, by another picture signal drive described video display board display panel drive and

The projection section of projected image light.

7. a projection type video display device is characterized in that,

Be the projection type video display device that possesses the lighting device that is made of solid light source in the described lighting device of claim 4, this projection type video display device possesses:

Receive video display board through the light of described narrow wavelength coverage polarization rotation element,

The projection section of projected image light.

8. a lighting device is characterized in that,

By the described optical element of claim 2 and have outgoing light of all kinds three independent solid light sources optical system or the optical system that the white light of white light source is separated into light of all kinds constituted,

, and relevant with the second color light at least by means of described optical element with the light of all kinds described specific light path that leads, utilize second polarized light.

9. a projection type video display device is characterized in that

Be the projection type video display device that possesses the lighting device that is made of solid light source in the described lighting device of claim 8, this projection type video display device possesses:

Be arranged on the video display board on the described specific light path,

The projection section of projected image light.

10. projection type video display device is characterized in that possessing:

The described optical element of claim 1,

Three video display boards of usefulness of all kinds are configured to such an extent that can respectively image light be supplied with three planes of light incidence of described optical element,

Optical system, have outgoing light of all kinds three independent solid light sources optical system or can will be separated into from the white light of white light source light of all kinds and

The projection section of projected image light constitutes

11. a projection type video display device is characterized in that possessing:

The described optical element of claim 2,

The projection section of projected image light constitutes

12. a lighting device is characterized in that,

Possess three kinds of colors of described optical element of claim 1 and outgoing, three illumination section of different coloured light mutually,

At least one illumination section is two solid light sources that possess two kinds of color light in the described three kinds of colors of outgoing, with synthetic described two kinds of color light, from two look parts of beam projecting face outgoing, Be Controlled must be cut apart illumination section with described two kinds of color light are cut apart outgoing on time time

By the facial reflection of described polarized light beam splitter, the second color light of cutting apart first polarized light of illumination section outgoing from the time sees through described polarized light beam splitter face from the second color light of described second polarized light of an illumination section outgoing.

13. a projection type video display device is characterized in that,

Possess the described lighting device of claim 12,

In advance single video display board is configured in the beam projecting side of optical element described in the described lighting device, cut apart according to the time and light by being cut apart other two illumination section beyond the illumination section time in the described lighting device, thereby make three kinds of color light cut apart outgoing on time, and be partitioned into the sequential that coloured light of penetrating is lighted by the time according to described, drive described video display board by picture signal of all kinds.

14. according to the described projection type video display device of claim 13, it is characterized in that, possess: use LCD panel as described single video display board, the polarization direction that can make the light of all kinds that is imported into described LCD panel simultaneously on same direction consistent polarization optical element or possess can be corresponding with different polarization direction light LCD panel and display panel drive.

15. a projection type video display device is characterized in that,

Possess the described lighting device of claim 12 and to modulating three video display boards of usefulness from the light of each illumination section outgoing,

The sequential of cutting apart illumination according to the described time is driven with picture signal by the different color of described two kinds of colors cuts apart the video display board that illumination section receives described two kinds of color different light rays from the time described in the described lighting device.

16. a lighting device is characterized in that,

Possess three kinds of colors of described optical element of claim 2 and outgoing, three illumination section of different coloured light mutually,

At least one illumination section, be two solid light sources that possess two kinds of color light in three kinds of colors of outgoing, with behind synthetic described two kinds of color light from two look parts of beam projecting face outgoing, Be Controlled must be cut apart illumination section with described two kinds of color light are cut apart outgoing on time time

With the second color light of the second color light of facial first polarized light of will be mutually advancing with orthogonal directions of the polarized light beam splitter of described optical element and the second polarized light described specific light path that leads, and described polarized light beam splitter face only plays under the situation of polarized light beam splitter effect the second color light, even described first color light and the 3rd color light second polarized light also can see through this polarized light beam splitter face and be directed to described specific direction

By the facial reflection of described polarized light beam splitter, the second color light of cutting apart first polarized light of illumination section outgoing from the described time sees through described polarized light beam splitter face from the second color light of described second polarized light of an illumination section outgoing.

17. a projection type video display device is characterized in that,

Possess the described lighting device of claim 16,

18. according to the described projection type video display device of claim 17, it is characterized in that, have and use LCD panel as described single video display board, the polarization direction that can make simultaneously the light of all kinds that is imported into described LCD panel consistent polarization optical element on same direction, perhaps possess can be corresponding with different polarization direction light LCD panel and display panel drive.

19. a projection type video display device is characterized in that

Constitute by the described lighting device of claim 16 with to three video display boards modulating from the light of each illumination section outgoing,

20. a lighting device is characterized in that,

Possess the described optical element of claim 1, with three illumination section of the mutual different coloured light of three kinds of colors of outgoing,

At least one illumination section, be two solid light sources that possess two kinds of color light in three kinds of colors of outgoing, with the mutual differently opticator of outgoing in the polarization direction that makes these emergent raies, and with the polarized light light composite part of the synthetic back of mutual different coloured light, described two kinds of polarization directions from the outgoing of a beam projecting face, Be Controlled must be cut apart illumination section with described two kinds of color light are cut apart outgoing on time time

With the polarized light beam splitter face of the described optical element described specific light path that will lead with the second color light of the second color light of first polarized light of advancing with orthogonal directions mutually and second polarized light,

Reflected by described polarized light beam splitter face from the second color light of described second polarized light of an illumination section outgoing, the second color light of cutting apart first polarized light of illumination section outgoing from the described time sees through described polarized light beam splitter face.

21. a projection type video display device is characterized in that,

Be the projection type video display device that possesses the described lighting device of claim 20,

This projection type video display device possesses display panel drive, this display panel drive is configured in single video display board the beam projecting side of described optical element in advance, cut apart according to the time and light by being cut apart other two illumination section beyond the illumination section time in the described lighting device, make three kinds of color light cut apart outgoing on time, and be partitioned into the sequential that coloured light of penetrating is lighted by the time according to described, drive described video display board by picture signal of all kinds

And the time cut apart illumination section and possess the polarization direction polarization optical element of applying on first polarization direction that makes the second color light and other color light.

22. according to the described projection type video display device of claim 21, it is characterized in that,

Have and use LCD panel as described single video display board, the polarization direction that can make simultaneously the light of all kinds that is imported into described LCD panel consistent polarization optical element on same direction, perhaps possess can be corresponding with different polarization direction light LCD panel and display panel drive.

23. a projection type video display device is characterized in that

Constitute by the described lighting device of claim 20 with to three video display boards modulating usefulness from the light of each illumination section outgoing,

24. a lighting device is characterized in that,

Possess the described optical element of claim 2, with three illumination section of the mutual different coloured light of three kinds of colors of outgoing,

At least one illumination section, be two solid light sources that possess two kinds of color light in three kinds of colors of outgoing, opticator with the mutual different back outgoing in the polarization direction that makes these emergent raies, and with the polarized light light composite part of the synthetic back of mutual different coloured light, described two kinds of polarization directions from the outgoing of a beam projecting face, Be Controlled must be cut apart illumination section with described two kinds of color light are cut apart outgoing on time time

With the second color light of the second color light of facial first polarized light of will be mutually advancing with orthogonal directions of described polarized light beam splitter and the second polarized light described specific light path that leads, simultaneously when described polarized light beam splitter face only under the situation to the second color light polarizing light beam splitter effect, even described first color light and the 3rd color light second polarized light also can see through this polarized light beam splitter face, be directed to described specific direction

The second color light from described second polarized light of an illumination section outgoing, reflected by described polarized light beam splitter face, the second color light of cutting apart first polarized light of illumination section outgoing from the described time sees through described polarized light beam splitter face.

25. a projection type video display device is characterized in that,

Be the projection type video display device that possesses the described lighting device of claim 24,

This projection type video display device possesses the beam projecting side that in advance single video display board is configured in described optical element, light by comprising that other two illumination section that the time in the described lighting device can be cut apart beyond the illumination section were cut apart according to the time, make three kinds of color light cut apart outgoing on time, and be partitioned into the sequential that coloured light of penetrating is lighted by the time according to described, drive the display panel drive of described video display board by picture signal of all kinds.

26. according to the described projection type video display device of claim 25, it is characterized in that,

Possesses the LCD panel of use as described single video display board, the polarization direction that can make simultaneously the light of all kinds that is imported into described LCD panel consistent polarization optical element on same direction, perhaps possess can be corresponding with different polarization direction light LCD panel and display panel drive.

27. a projection type video display device is characterized in that,

Constitute by the described lighting device of claim 24 with to three video display boards of each illumination section emergent ray modulation usefulness,