CN101320201A

CN101320201A - Projection display

Info

Publication number: CN101320201A
Application number: CNA200810098673XA
Authority: CN
Inventors: 山田旭洋; 别所智宏; 大上户晃; 高桥素男
Original assignee: Mitsubishi Electric Corp
Current assignee: Seiko Epson Corp
Priority date: 2007-06-05
Filing date: 2008-06-05
Publication date: 2008-12-10
Anticipated expiration: 2028-06-05
Also published as: JP5301017B2; JP2009015295A; CN101320201B; JP5496262B2; JP5100430B2; CA2716460C; CA2716963C; KR100958478B1; CA2716963A1; ES2391922T3; CN101825833A; CA2716460A1; KR20080107277A; ES2391493T3; CN101825833B; JP2012194578A; CN101825834B; CN101825834A; ES2391867T3; JP2012226361A

Abstract

The invention provides a projection display that achieves continuous light amount control with ease and without causing unevenness of illumination of light applied to a light valve responsive to a video signal, thereby allowing constant image display with satisfactory contrast. The projection display of the invention includes a light valve (2); a light source (3a) generating light applied to the light valve (2); an integrator lens (4) provided on an optical path between the light source (3a) and the light valve (2) and making uniform the illumination distribution of light applied from the light source (3a) to the light valve (2); and a light amount control system (9) provided on the optical path and including a turning mechanism (9a) which turns like a set of double doors in order to adjust the amount of light applied from the light source (3a) to the light valve (2). The turning mechanism (9a) is bent into a V shape in a direction to reduce the amount of light (to block the light).

Description

Projection display device

Technical field

The present invention relates to projection display device, it has the light intensity adjusting mechanism of regulating the light quantity that shines the light on the light valve according to signal of video signal.

Background technology

In projection display device, owing to constitute the various optical element light leaks of optical system and the reason of the parasitic light (unwanted light) that produces at optical element from guided optical system and projecting lens etc., exist darker image to show secretly inadequately, be difficult to obtain the trend of higher contrast.Particularly when indoorly on screen, during projection image,, then giving and look the impression that the hearer brings the contrast deficiency if dark image can not be shown enough dark darker.Particularly in the projection display device that uses liquid crystal light valve, liquid crystal light valve blocks transmitted light owing to the polarisation of light characteristic, but can not block transmitted light fully, and also has the limit in the reply of handling based on signal of video signal, so require to improve contrast.

As the countermeasure that addresses this is that, between first lens arra and second lens arra, dispose shadow shield, according to signal of video signal flat shadow shield is rotated, suppress to shine the light quantity of the light on the light valve thus, improve the contrast (for example with reference to patent documentation 1) that projects to the image on the screen etc.

Patent documentation 1:WO 2005-026835 communique

In patent documentation 1, be shaped as when on the direction that shadow shield is vertical relatively, having rectangular surfaces at the front end of shadow shield, near first lens arra, when the front end of shadow shield is positioned at the The curvature center place of second lens arra on the rotation direction of shadow shield, the rectangular surfaces of shadow shield images on the light valve, so exist in the problem that produces the uneven illumination of wire on rotation direction and the direction vertical with optical axis direction on the light valve.In addition, according to the difference of the front end shape of occulter, also there is the problem that can not obtain enough contrasts.

Summary of the invention

The present invention finishes in order to address the above problem, its purpose is, a kind of projection display device is provided, and it carries out continuous light amount easily and regulates, make the light that shines on the light valve according to signal of video signal not produce uneven illumination, thereby can show the image of enough contrasts always.

In order to address the above problem, projection display device of the present invention is characterised in that it has: light valve; Light source, its generation shines the light on the light valve; Integration lens, it is configured on the light path between light source and the light valve, the Illumination Distribution homogenising of the light on making from the light source irradiation to the light valve; And light intensity adjusting mechanism, it is configured on the light path, have a pair of occulter that rotates in the mode that splits around door, the light quantity of the light on this a pair of occulter is used to regulate from the light source irradiation to the light valve, occulter forms when rotating and is bent into " く " shape in the direction that light quantity is reduced.

According to the present invention, because have: integration lens, it is configured on the light path between light source and the light valve, the Illumination Distribution homogenising of the light on making from the light source irradiation to the light valve; And light intensity adjusting mechanism, it is configured on the light path, occulter light quantity, that rotate in the mode that splits around door with a pair of light on being used to regulate from the light source irradiation to the light valve, occulter forms when rotating and is bent into " く " shape in the direction that light quantity is reduced, so can carry out continuous light amount easily regulates, make the light that shines on the light valve according to signal of video signal not produce uneven illumination, the feasible image that always can show enough contrasts.

Description of drawings

Fig. 1 is the structural drawing of lamp optical system of the projection display device of embodiments of the present invention 1.

Fig. 2 is the structural drawing of the polarization conversion device of embodiments of the present invention 1.

Fig. 3 is the figure of an example of shape of the rotating mechanism of expression embodiments of the present invention 1.

Fig. 4 is the figure of rotational action of the rotating mechanism of expression embodiments of the present invention 1.

Fig. 5 be the rotational angle of the rotating mechanism of expression embodiments of the present invention 1 when being shape shown in Figure 3 with relative light amount ratio between the figure of relation.

Fig. 6 is that the relative light amount ratio of expression embodiments of the present invention 1 is the figure of the position of front end on the z direction of 20% o'clock rotating mechanism.

Fig. 7 is the rotating mechanism of expression embodiments of the present invention 1 during with the complete shading of shape shown in Figure 3, shines the figure of the Illumination Distribution of the light on the light valve.

Fig. 8 is the figure of the relation between rotational angle and the relative light amount ratio that is illustrated in when not forming concavity portion on the occulter of embodiments of the present invention.

Fig. 9 is near the figure of the light source picture of second lens arra of expression embodiments of the present invention 1.

Figure 10 is the figure of an example of shape of the rotating mechanism of expression embodiments of the present invention 1.

Figure 11 be the rotational angle of the rotating mechanism of expression embodiments of the present invention 1 when being shape shown in Figure 10 with relative light amount ratio between the figure of relation.

Figure 12 is the trajectory diagram of expression with respect to the light of the shape of the rotating mechanism of embodiments of the present invention 1.

Figure 13 is the trajectory diagram of the size of rotating mechanism of expression embodiments of the present invention 1 light during less than lens arra.

Figure 14 is the trajectory diagram of the light of expression when having carried out from the center of the light valve of embodiments of the present invention 1 that retrodirected ray is followed the trail of.

Figure 15 is the figure that is illustrated in the turned position of the rotating mechanism when producing imaging on the light valve of embodiments of the present invention 1.

Figure 16 is the figure that is illustrated in the turned position of the rotating mechanism when producing imaging on the light valve of embodiments of the present invention 1.

Figure 17 is the figure that expression shines the Illumination Distribution of the light on the light valve of embodiments of the present invention 1.

Figure 18 is the figure that expression shines the Illumination Distribution of the light on the light valve of embodiments of the present invention 1.

Figure 19 is the figure of the relative light amount ratio on each y axle among Figure 17 and Figure 18 of expression embodiments of the present invention 1.

Figure 20 is the structural drawing of lamp optical system of the projection display device of embodiments of the present invention 2.

Figure 21 is the figure that is illustrated in the turned position of the rotating mechanism when producing imaging on the light valve of embodiments of the present invention 2.

Figure 22 is the figure that is illustrated in the turned position of the rotating mechanism when producing imaging on the light valve of embodiments of the present invention 2.

Figure 23 is the figure that expression shines the Illumination Distribution of the light on the light valve of embodiments of the present invention 2.

Figure 24 is the figure of the relative light amount ratio on each y axle among Figure 23 of expression embodiments of the present invention 2.

Figure 25 is the figure of front end shape of the rotating mechanism of expression embodiments of the present invention 2.

Figure 26 is the structural drawing of lamp optical system of the projection display device of expression embodiments of the present invention 3.

Figure 27 is the figure that expression is injected into the light path of the light on the light valve of embodiments of the present invention 3.

Figure 28 is second lens arra of expression by embodiments of the present invention 3 and the trajectory diagram of the light of polarization conversion device.

Figure 29 is that expression is injected into the incident angle of the light on the light valve of embodiments of the present invention 3 and the graph of a relation between the contrast.

Figure 30 is the figure of an example of shape of the rotating mechanism of expression embodiments of the present invention 3.

Figure 31 is the figure of expression by the light quantity of the light of each unit of the second lens arra 4b of embodiments of the present invention 3.

Figure 32 is the trajectory diagram of expression from the light of light source 3 ejaculations of embodiments of the present invention 3.

Figure 33 is the figure that expression shines the Illumination Distribution of the light on the light valve of embodiments of the present invention 3.

Figure 34 is the figure of an example of shape of the rotating mechanism of expression embodiments of the present invention 3.

Figure 35 be the rotational angle of the rotating mechanism of expression embodiments of the present invention 3 when being shape shown in Figure 30 with relative light amount ratio between the figure of relation.

Figure 36 is the figure of an example of shape of the rotating mechanism of expression embodiments of the present invention 3.

Figure 37 be the rotational angle of the rotating mechanism of expression embodiments of the present invention 3 when being shape shown in Figure 35 with relative light amount ratio between the figure of relation.

Figure 38 is the figure of an example of shape of the rotating mechanism of expression embodiments of the present invention 3.

Embodiment

Below, use the description of drawings embodiments of the present invention.

＜embodiment 1 〉

Fig. 1 is the structural drawing of lamp optical system 1 of the projection display device of embodiments of the present invention 1.As shown in Figure 1, lamp optical system 1 is made of the integration lens 4 between light-source system 3 and light valve 2, polarization conversion device 5, collector lens 6, field lens 7 and polaroid 8.In addition, the projection display device of embodiments of the present invention 1 has the projecting lens (not shown) that is used for light from light valve 2 to screen prjection that penetrate from.And light valve 2 is located on the light path separately of RGB, and lamp optical system 1 shown in Figure 1 shows in the light path separately of RGB typically.

Light valve 2 uses liquid crystal light valve in embodiments of the present invention, but when using lens arra, also can be DMD (Digital Micro-Mirror Device, Digital Micromirror Device) and reflection type liquid crystal display element etc.

Light-source system 3 is in order to be provided with to light valve 2 irradiates lights, by light source 3a with the light that penetrates from light source 3a is constituted by the catoptron 3b of reflection to the irradiation of integration lens 4 sides.Light source 3a uses high-pressure sodium lamp, Halogen lamp LED or xenon lamp usually, but itself so long as luminaire just can, for example also can be LED (light emitting diode), laser and electrodeless discharge lamp etc.Shape, the structure of catoptron 3b are not particularly limited, and it for example forms parabola or elliptical area, as long as make optical convergence on polarization conversion device 5, it can be shape and structure arbitrarily.For example under the situation that makes the light that incides integration lens 4 and optical axis C almost parallel, can make the parabola that is shaped as of catoptron 3b, perhaps when being elliptical area, widely to cause parallelly in order making, to adopt means such as between light-source system 3 and integration lens 4, disposing concavees lens to get final product (with reference to Figure 32).

Integration lens 4 is configured on the light path between light-source system 3 and the light valve 2, be used to make from light-source system 3 shine being evenly distributed of illuminance on the light valve 2, constitute by the first lens arra 4a with the second lens arra 4b of first lens arra 4a devices spaced apart configuration.The first lens arra 4a and the second lens arra 4b constitute and dispose a plurality of convex lens in length and breadth, and each convex lens of each convex lens of the first lens arra 4a and the second lens arra 4b are configuration in opposite directions accordingly mutually.

The Beam Transformation that polarization conversion device 5 will incide self is that a kind of rectilinearly polarized light penetrates then, separates the appropriate intervals configuration at the x direction of principal axis.Fig. 2 is the structural drawing of the polarization conversion device 5 of embodiments of the present invention 1.As shown in Figure 2, this polarization conversion device 5 is by constituting with the lower part: a plurality of polarization separating film 5a, and they are with respect to optical axis C direction (z direction) inclination (45 degree for example tilt) configuration; A plurality of reflectance coating 5b, they are configured between each polarization separating film 5a with respect to optical axis C direction (z direction) inclination (45 degree for example tilt); And λ/2 polarizer 5c, it is configured on the face of light valve 2 sides of polarization conversion device 5 and is crossed on light-struck part of polarization separating film 5a by transmission.The light that incides polarization conversion device 5 is separated into s polarized light and p polarized light by polarization separating film 5a.P polarized light transmission polarization separating film 5a penetrates from polarization conversion device 5 by means of λ/2 polarizer 5c are converted into the s polarized light.On the other hand, the s polarized light reflects on polarization separating film 5a, and the film 5b reflection that is reflected, and penetrates from polarization conversion device 5 then.Therefore, the light beam that penetrates from polarization conversion device 5 almost is the s polarized light entirely.

It is rotating mechanism 9a that light quantity regulating system 9 (light intensity adjusting mechanism) has a pair of occulter that rotates in the mode that splits around door, it is configured on the light path, be used to regulate the light quantity that shines the light on the light valve 2 from light-source system 3, light quantity regulating system 9 constitutes and comprises: rotating mechanism 9a, and it is configured between the first lens arra 4a and the second lens arra 4b; Signal detecting part 9b, its detection is input to the signal of video signal of light valve 2, and calculates the relative light amount ratio that shines the light quantity on the light valve 2 according to testing result; With rotation control part 9c, it is according to recently controlling rotating of rotating mechanism 9a by what signal detecting part 9b calculated relative to light quantity.Shown in Fig. 3 (b), rotating mechanism 9a is made of

occulter

9T and 9B, and

occulter

9T and 9B form in the direction that makes light quantity reduce (shading) and be bent into " く " shape.And occulter 9T and 9B form the 9g of concavity portion that passes through that leading section is cut into restriction light.The 9g of concavity portion can be arbitrary shapes such as concavity curve shape, parabolic shape, half-oval shaped, triangle.

The following describes the raising of contrast.Relative light amount ratio at signal of video signal is 100% o'clock, regulates to make not being rotated the 9a of mechanism shading with 100% relative light quantity.For example, be 20% o'clock in the relative light amount ratio of signal of video signal, utilizing rotating mechanism 9a to carry out shading, to make relative light amount ratio be 20%, can carry out about 5 times careful signal of video signal thus and regulate.And, reduce relative light amount ratio by the shading of rotating mechanism 9a, can reach thus than signal of video signal is the darker effect of situation of relative light amount ratio not shading black when being 0% signal.That is, because the transmissivity of light valve 2 is roughly certain, thus by utilizing rotating mechanism 9a to reduce the light quantity that shines on the light valve 2, can make the image deepening that projects on the screen, in the hope of improving contrast.

Fig. 4 (a) is the rotational action figure of the rotational action of occulter 9T in the presentation graphs 3 (a) and 9B when rotating with 15 degree units, and Fig. 4 (b) is the rotational action figure of the rotational action of occulter 9T in the presentation graphs 3 (b) and 9B when rotating with 15 degree units.According to shown in Fig. 4 (a) and Fig. 4 (b) as can be known, the amount of movement of the front end of

occulter

9T and 9B on the z direction is, (Za＞Zb) is so occulter 9T and the moving amount of movement of a rotational angle on the y direction of 9B revolution are bigger in Fig. 4 (b) less than amount of movement Za shown in Fig. 4 (a) for amount of movement Zb shown in Fig. 4 (b).Therefore, the shape of occulter 9T shown in Fig. 4 (b) and 9B can reach the illumination of relative light amount ratio 100% with less rotational angle.

Fig. 5 be the rotational angle of expression rotating mechanism 9a when being shape shown in Figure 3 with relative light amount ratio between the figure of relation.γ T among Fig. 3 (b) and γ B are 20 degree, and the rotational angle of each rotating mechanism 9a is 2 degree units.And rotational angle is 0 degree when referring to that

occulter

9T and 9B are closed fully, when promptly each

occulter

9T and 9B are in state shown in 41a among Fig. 4 and the 41b.The analog result of the rotating mechanism 9a of shape shown in curve 50 presentation graphs 3 (a), the analog result of the rotating mechanism 9a of shape shown in curve 51 presentation graphs 3 (b).As shown in Figure 5, the rising when relatively light amount ratio is low in the curve 51 is faster than curve 50, is about 75 at rotational angle and reaches 100% relative light amount ratio when spending.Because the operating angle scope is narrower, shape can realize the control that response is higher shown in Fig. 3 (a) so shape shown in Fig. 3 (b) is compared.And according to curve 50 and curve 51 as can be known, except that relative light amount ratio lower, light amount ratio with respect to the variation of rotational angle about equally relatively.According to the above,, under the situation that light amount ratio is lower relatively, form along radius of gyration direction by the front end that makes

occulter

9T and 9B and to be bent into " く " shape illustrated in fig. 14 as the back, can reduce uneven illumination.And, according to Fig. 5 as can be known, at two 9g of concavity portion of the formation of leading section separately of

occulter

9T and 9B, can carry out continuous light amount and regulate by as shown in Figure 3.In addition, in embodiments of the present invention, γ T and γ B are made as 20 degree, but can are arbitrarily angled,, also can obtain same effect even be not the relation of γ T=γ B.And the relation the when relation between the relative light amount ratio on the rotational angle of the rotating mechanism 9a shown in the embodiments of the present invention and the light valve 2, the relative light amount ratio of expression input are 100% signal is only represented the characteristic of rotating mechanism 9a.

Relative light amount ratio in Fig. 6 presentation graphs 5 is the position of front end on the z direction of 20% o'clock occulter 9T and 9B.Shown in Fig. 6 (a), the rotational angle during shape shown in Fig. 3 (a) is about 24 degree,

Degree, the rotational angle during shape shown in Fig. 3 (b) are about 14 degree,

Degree.And, in Fig. 6 (b), α 3=γ T=20 degree.In Fig. 6 (a), the length of

occulter

9T and 9B is made as d1, in Fig. 6 (b), the length from the rotation axis of

occulter

9T and 9B to bending part is made as d2, the length from the bending part to the front end is made as d3.According to above condition, the position of front end on the z direction of occulter 9T in the calculating chart 3 (b) and 9B.

According to Fig. 6 (a) and Fig. 6 (b),

occulter

9T and 9B amount of movement Zc and formula (1) below the Zd utilization and formula (2) expression on the z direction.

Zd = d 2 \times \sin (α 2) + d 3 \times \sin (α 2 - α 3)

According to Fig. 4 (b), d1 utilizes formula (3) expression.

Therefore, Zc utilizes formula (4) expression, so according to the eligible Zc＞Zd of formula (5).

1＞d2/d3 ......(5)

Therefore, shorter by the length that makes d2 than d3, compare shape shown in Fig. 3 (a), shape can reduce uneven illumination shown in Fig. 3 (b).The reason of uneven illumination is not only the front end displacement of

occulter

9T and 9B, thus the condition of preferred formula (5), but may not satisfy.

Fig. 7 is the figure that shines the Illumination Distribution of the light on the light valve 2 when representing with the complete shading of shape shown in Fig. 3 (b).When complete shading, inject roughly whole (regional 7a) and the two ends periphery (regional 7b) on the x direction of the overlapping equably illuminating light valve 2 of light of the second lens arra 4b, so can not produce uneven illumination.When zone 7a represents that the peristome integral body of the unit of the second lens arra 4b is roughly opening, (zone 30 Fig. 3 (b)) shines the Illumination Distribution of the light on the light valve 2 from the unit, zone 7b represents the peristome of unit of the second lens arra 4b roughly during a half opening, and (zone 31 Fig. 3 (b)) shines the Illumination Distribution of the light on the light valve 2 from the unit.

Fig. 8 is the figure of the relation between rotational angle and the relative light amount ratio that is illustrated in when not having not form concavity portion on the occulter of bending part 9T and the 9B.Rotational angle with 2 degree units is simulated.According to curve 80 as can be known, light amount ratio is not continuous with respect to the variation of rotational angle relatively, has par (8a, 8b, 8c, 8d) everywhere.

Fig. 9 is near the figure of the light source picture the expression second lens arra 4b.Fig. 9 utilizes the gray level expressing of 256 gray scales.According to Fig. 9,9a, 9b, 9c, 9d represent respectively+dark portion between the light source picture of y direction.The 8a of par everywhere among Fig. 8,8b, 8c, 8d are corresponding to the dark 9a of portion, 9b, 9c, 9d between the picture of light source everywhere shown in Figure 9, and the dark portion that can confirm between the light source picture is the influence of the par among Fig. 8.Therefore, change continuously, need the light and shade portion between the light source of the shading simultaneously picture in order to make light quantity.As shown in Figure 3,, then can light quantity be changed continuously, so by on

occulter

9T and 9B, forming concavity portion, the light and shade portion between the light source of the shading simultaneously picture if on

occulter

9T and 9B, form concavity portion.

Figure 10 is the figure of an example of the shape of

expression occulter

9T and 9B, is symmetrically formed a 9g of concavity portion with respect to optical axis C.When utilizing the complete shading of this shape, the irradiation on the light valve 2 distributes roughly even.

Figure 11 be expression occulter 9T and the 9B rotational angle when being shape shown in Figure 10 with relative light amount ratio between the figure of relation.In Figure 10, the γ T of

occulter

9T and 9B and γ B are made as 20 degree.The analog result of the rotating mechanism 9a of curve 110 expressions shape shown in Figure 10.Curve 80 expression does not form the analog result of the rotating mechanism 9a of concavity shown in Figure 8 portion shape, compares having or not the effect that forms the concavity 9g of portion.For easy comparison, moving curve 80 makes it to overlap with curve 110.According to Figure 11, when on

occulter

9T and 9B, forming the 9g of concavity portion, compare the occulter 9T and the 9B that do not form concavity portion, can carry out light quantity continuously and regulate.That is, at least one 9g of concavity portion of formation is more effective to the continuous adjusting of light quantity on occulter 9T and 9B.But, according to the curve 51 of Fig. 5 and the curve 110 of Figure 11, compare when forming a concavity portion, it is smoother to form two concavity portion time quantitative changeizations, therefore in order to carry out more level and smooth light quantity adjusting, is preferably formed a plurality of concavity portion.

Figure 12 is the trajectory diagram of the light when turning to the first lens arra 4a side when being illustrated in

occulter

9T and 9B shading, especially expression by among the first lens arra 4a on+y direction apart from the center farthest the trajectory diagram of light of lens unit.At this explanation occulter 9T, but also identical for occulter 9B.120a represents the track of the light of scioptics unit center+y side, and 120b represents the track of light at the center of scioptics unit, 120c represent the scioptics unit center-track of the light of y side.As shown in figure 12, when less or bending position is away from rotation axis in the bending angle of occulter 9T, unwanted light in the reflection of occulter 9T place passes through the second lens arra 4b, and repeatedly reflection in the framework (not shown) of lamp optical system 1, might appear on the screen.Therefore, the occulter 9T and the 9B that when shading, preferably rotate, rather than the occulter 9T and the 9B of switching direction shown in Figure 12 towards the second lens arra 4b side.

Figure 13 (a) is the trajectory diagram of the x direction of expression occulter 9T and 9B and the size on the y direction light during less than the first lens arra 4a and the second lens arra 4b.And, Figure 13 (b) is x direction and the x direction of the size on the y direction and the second lens arra 4b and the comparison diagram of the size on the y direction of each occulter 9T and 9B, represents that the x direction of each occulter 9T and 9B and the size on the y direction are less than the x direction of the second lens arra 4b and the size on the y direction.At this explanation occulter 9T, but also identical for occulter 9B.130a represents that optical axis C by the distance first lens arra 4a is at the track of the light at the center of the lens unit of+the 5th position of y direction, 130b represent the scioptics unit the center+track of the light of x direction side, wherein, this lens unit be positioned at the distance first lens arra 4a optical axis C in+the 2nd position of y direction and in+the 3rd position of x direction.According to shown in Figure 13 (a) as can be known, the rotation axis by being positioned at occulter 9T and 9B+light of the first lens arra 4a of y side, do not touch occulter 9T and 9B promptly by+y side.Therefore, regulate from the light quantity of the light of first lens arra 4a ejaculation in order to utilize occulter 9T and 9B, the x direction of preferred occulter 9T and 9B and the size on the y direction are greater than the first lens arra 4a and the second lens arra 4b.In the size of the second lens arra 4b during greater than the first lens arra 4a, the x direction of preferred occulter 9T and 9B and the size on the y direction are greater than the second lens arra 4b, but by between the second lens arra 4b and polarization conversion device 5, shadow shield being set, can shading unwanted light by the second lens arra 4b.Therefore, the x direction of occulter 9T and 9B and the size on the y direction may not be greater than the first lens arra 4a and the second lens arra 4b.

Figure 14 is the light of retrodirected ray when following the trail of is carried out in expression from the center of light valve 2 a trajectory diagram.The track of 140 expression light, the position of the optical convergence shown in 141 expressions 140 of zone.Image on the light valve 2 according near the picture that can confirm the first lens arra 4a shown in Figure 14, so have conjugate relation near the face of injecting of the light valve 2 and the first lens arra 4a.Therefore, in the time of near the front end of

occulter

9T and 9B is positioned at regional 141, the front end of

occulter

9T and 9B images on the light valve 2, produces the uneven illumination of wire near the center on the light valve 2 along the x direction.Therefore, the front end that preferably makes

occulter

9T and 9B is near the second lens arra 4b, promptly be configured in rotation axis near the second lens arra 4b.

And, observe the leading section of

occulter

9T and 9B, if being formed,

occulter

9T and 9B make it be bent into " く " shape in the direction that reduces light quantity (shading), when then comparing not bending, the width of imaging on the y direction (with reference to the dy1 among Figure 15 and the dy2 among Figure 16) diminishes, so can alleviate the uneven illumination that results from the light valve 2.Therefore, be bent into " く " shape, can alleviate the uneven illumination that results from the light valve 2 by

occulter

9T and 9B are formed in the direction that reduces light quantity (shading).

Figure 15 and Figure 16 are when being illustrated in shape shown in Fig. 3 (a) and Fig. 3 (b), the figure of occulter 9T the during imaging of front end that produces

occulter

9T and 9B on light valve 2 and the turned position of 9B.As the condition that on light valve 2, produces imaging, the front end of

occulter

9T and 9B be positioned at the first lens arra 4a near, and be in the position identical with the The curvature center of lens unit, these lens units be from the optical axis C of the second lens arra 4b+y or-the 2nd lens unit on the y direction.150,151,160,161 all represent by from the optical axis C of second lens arra+y or-axle of the center of curvature of the 2nd lens unit on the y direction.152,162 fore-ends of all representing occulter 9T.

Illustrate the front end that makes occulter 9T and 9B be in from the optical axis C of the second lens arra 4b+y or-reason of the position that the The curvature center of the 2nd lens unit on the y direction is identical.At first, with from the optical axis C of the second lens arra 4b+y or-the identical position of The curvature center of the 1st lens unit on the y direction, illumination is lower, is difficult to confirm to be created in the uneven illumination on the light valve 2.And, with from the optical axis C of the second lens arra 4b+y or-the identical position of The curvature center of the 3rd lens unit on the y direction, come since optical axis C rise+y or-the 1st lens unit on the y direction and optical superposition the 2nd lens unit, that do not have uneven illumination be on light valve 2, so relatively low by the uneven illumination on light valve 2 that the 3rd lens unit causes, be difficult to confirm.Therefore, as the condition of on light valve 2, confirming easily the front end imaging of occulter 9T and 9B, the front-end configuration of occulter 9T and 9B with from the optical axis C of the second lens arra 4b+y or-the identical position of The curvature center of the 2nd lens unit on the y direction.

Figure 17 (a) expression is when not having the shape of the 9g of concavity portion shown in Fig. 3 (a), the analog result of the Illumination Distribution on the light valve 2 under the state shown in Figure 15, Figure 17 (b) expression is when not having the shape of the concavity portion shown in Fig. 3 (b), the analog result of the Illumination Distribution on the light valve 2 under the state shown in Figure 16.As shown in figure 17,170a and 170b represent the zone that illumination is lower, and 171a and 171b represent the y axle by the center of light valve 2.It is less that relatively 170a and 170b can confirm the uneven illumination of 170b.This is because dy1 among Figure 15 and the pass between the dy2 among Figure 16 are dy1＞dy2.Therefore, be bent into " く " shape, can alleviate the uneven illumination that results from the light valve 2 by

occulter

9T and 9B are formed in the direction that reduces light quantity (shading).According to above situation,,, just can alleviate uneven illumination as long as bending forms occulter 9T and 9B even do not meet the condition of aforementioned formula 5.

Figure 18 represents when being shape shown in Fig. 3 (b), the analog result of the Illumination Distribution on the light valve 2 under the state shown in Figure 16.As shown in figure 18, the center from light valve 2 begins to exist hardly the lower zone of illumination on the x direction.180 expressions begin the lower zone of illumination on the y direction from the center of light valve 2,181 expressions are by the y axle at the center of light valve 2.The 9g of concavity portion of

occulter

9T and 9B is in the spot position of the second lens arra 4b, can confirm small uneven illumination in zone 180, but the Illumination Distribution of light valve 2 integral body is roughly uniform, so no problem.Therefore, make

occulter

9T and 9B be bent into " く " shape in the direction that reduces light quantity (shading), leading section at

occulter

9T and 9B forms at least one concavity portion, and reduce the par outside the concavity portion of front end, alleviate the overlapping of the front end shape that images on the light valve 2 thus, can significantly alleviate uneven illumination.

Figure 19 is illustrated in the figure that the y axle that illustrates respectively among Figure 17 (a), Figure 17 (b) and Figure 18 is the relative light amount ratio on the y direction on 171a, the 171b, 181.Transverse axis is corresponding to the longitudinal axis of light valve shown in Figure 180 2.As shown in figure 19, the relative light amount ratio on the 190 expression 171a, the relative light amount ratio on the 191 expression 171b, the relative light amount ratio in 192 expressions 181.The center that contrasts according to Figure 19 on the y direction of light valve 2 is the value of the relative light amount ratio of 0.5Y, can confirm 190＜191＜192, and uneven illumination also is to reduce according to 190,191,192 order.Therefore, be bent into " く " shape by

occulter

9T and 9B are formed in the direction that reduces light quantity (shading), and make leading section form concavity portion, can alleviate uneven illumination.

In addition, in embodiments of the present invention, during the position of the 41b in being in Fig. 4 (b), angle shown in Figure 6 is made as γ T=α 2=α 3, but by being made as α 3＞α 2=γ T, can further reduce the width of dy2 shown in Figure 16, therefore compare the shape shown in Fig. 4 (b), can further alleviate uneven illumination.And the bending of

occulter

9T and 9B is only at a place, if but can reduce the width of dy2 shown in Figure 16, then also can be in the bending of two places.Like this, can alleviate uneven illumination.In addition, in Fig. 3 (b), the bending position is made as on the y direction that optical axis C with the second lens arra 4b is the center near the 2nd lens unit position, but also can be in the bending of any position.

According to the above, occulter 9T by making

rotating mechanism

9a and 9B form in the direction that reduces light quantity (shading) and are bent into " く " shape, and leading section is formed cut out a concavity portion at least, can realize that the continuous light amount that can not produce uneven illumination on light valve 2 regulates.

＜embodiment 2 〉

Figure 20 is the structural drawing of lamp optical system 1b of the projection display device of embodiments of the present invention 2.In embodiments of the present invention 2, it is characterized in that the occulter 9T of rotating mechanism 9a and the leading section of 9B form the tooth shape shape portion that is whittled into.The structure of part in addition is identical with embodiment 1 with action, so in this description will be omitted.

Figure 21 is the figure that is illustrated in the turned position of the rotating mechanism when producing imaging on the light valve of embodiments of the present invention 2.For giving same numeral with embodiment 1 corresponding part.Allocation position about

occulter

9T and 9B among Figure 22 is identical with Figure 15.And, 210,211,220,221 all represent by from the optical axis C of second lens arra+y or-axle of the center of curvature of the 2nd lens unit on the y direction.As shown in figure 22, the leading section of

occulter

9T and 9B forms the part that is positioned at axle 220 optical axis C side of pruning and makes it become tooth shape shape portion.Thus, reduce the width of dy.In addition, consider that the width t of

occulter

9T and 9B is about 0.5mm usually about the intensity of the occulter of the rotation of rotating mechanism 9a.212,222 fore-ends of all representing occulter 9T.

Figure 23 (a) expression is when not having the shape of the 9g of concavity portion shown in Fig. 3 (a), the analog result of the Illumination Distribution on the light valve 2 under the state shown in Figure 21, Figure 23 (b) expression is when not having the shape of the concavity portion shown in Fig. 3 (a), the analog result of the Illumination Distribution on the light valve 2 under the state shown in Figure 22.At this, establish t=0.5mm.As shown in figure 23,230a and 230b represent the zone that illumination is lower, and 231a and 231b represent the y axle by the center of light valve 2.The uneven illumination that comparison 230a and 230b can confirm 230b is greatly improved.Therefore, as shown in figure 22, form by the leading section that makes

occulter

9T and 9B, the part of optical axis C side that is positioned at axle of pruning makes it become tooth shape shape portion, can significantly alleviate uneven illumination, wherein this axle by from the optical axis C of second lens arra+y or-center of curvature of the 2nd lens unit on the y direction.

Figure 24 is that to be illustrated in the y axle that illustrates respectively among Figure 23 (a), Figure 23 (b) be the figure of the relative light amount ratio of the y direction on 231a, the 231b.As shown in figure 24, the relative light amount ratio on the 240 expression 231a, the relative light amount ratio on the 241 expression 231b.The center that contrasts the y direction of light valve 2 according to Figure 24 is the value of the relative light amount ratio of 0.5Y, can confirm with 240 and compare, and 241 uneven illumination alleviates greatly.Therefore, form by the leading section that makes

occulter

Figure 25 is the figure of the leading section shape of expression occulter 9T and 9B.250,251 all represent by from the optical axis C of second lens arra+y or-axle of the center of curvature of the 2nd lens unit on the y direction.According to Figure 25, the angle of the leading section of

preferred occulter

9T and 9B is less than β.

According to the above, cut out at least one concavity portion of formation by leading section, and leading section is whittled into tooth shape shape portion at

occulter

9T and 9B, can realize can on light valve 2, not producing the continuous light amount adjusting of uneven illumination.

＜embodiment 3 〉

Figure 26 is the structural drawing of lamp optical system 1c of the projection display device of embodiments of the present invention 3.In embodiments of the present invention 3, it is characterized in that the leading section shape of

occulter

9T and 9B forms less aperture area, can fully improve contrast, and the feasible uneven illumination that does not produce on the light valve 2.The structure of part in addition is identical with embodiment 1 with action, so in this description will be omitted.

The light 270 that penetrates from the second lens arra 4b incides light valve 2 with bigger incident angle.At this moment, according to the characteristic of light valve, along with the angle of the light of incident light valve 2 increases, contrast reduces (with reference to Figure 29), thus the shape of

preferred occulter

9T and 9B can be to the incident angle of relative light valve 2 incident light of bigger light, especially x direction carry out shading.

Figure 28 represents the front elevation (a) on xy plane of the second lens arra 4b and polarization conversion device 5 and an example of side view (b).Figure 28 (c) is the figure of further concrete presentation graphs 2.And, the track of the light that incides the second lens arra 4b has been shown in Figure 28 (c).At this, dotted line part is represented polarization conversion device 5, grey colour specification λ/2 polarizer 5c.Usually, polarization conversion only makes optical convergence in the zone of λ/2 polarizer 5c, carries out polarization conversion thus effectively.Therefore, light 270,271,272,273,274,275 becomes and will be polarized the light of conversion.According to Figure 28 (c), the rectilinearly polarized light of the p+s of institute's incident is after the p polarized light incides polarization conversion device 5, be converted into the s polarized light by λ/2 polarizer 5c, so in the x direction position identical with incoming position, penetrate from polarization conversion device 5, comparing with the s polarized light, is the position ejaculation of dx (distance between 275a-275b) at the distance optical axis.Therefore, blocking on the x direction incident away from the light of optical axis, is must be obligato for improving contrast.That is, light 270,275 becomes the light that impacts to contrast.That is, become the condition that improves contrast at position incident ray near the x direction of optical axis C.

Figure 30 represents the shape of occulter 9T and 9B.The concavity portion of the front end of

occulter

9T and 9B comprises that two different concavity portions of area are 9g and 9h, and the aperture area of 9g is less than 9h.And 9g and 9h are formed on occulter 9T and the 9B, and are positioned at when with

occulter

9T and 9B closure with respect to the point-symmetric position of optical axis C.

Figure 31 is the light quantity of expression analog computation by the light of each unit of the second lens arra 4b, according to the figure of each unit by using numeric representation result of calculation.By forming shape shown in Figure 30, the contrast difference of x direction is alleviated.In addition, in Figure 31, the second lens arra 4b is symmetry up and down, and institute is so that it represents the 1st quadrant part.

The figure of the state that Figure 32 light that to be analog representation penetrate from light source 3 is reflected at catoptron 3b.Catoptron 3b forms elliptical area, makes the light that penetrates from light-source system 3 by concavees lens 310 row that flattens.Usually, near optical axis C, there is the bulb of light source, 311 its peristomes of expression.

Shown in figure 32,311 is peristome, so the amount of the light that penetrates from light-source system 3 is less in V1H1 unit shown in Figure 31.With the complete shading of shape shown in Figure 30 the time, the both ends of the x direction of the 9g of concavity portion illuminating light valve 2, the central portion of the 9h of concavity portion illuminating light valve 2.That is, the relative light quantity of the both ends by making the x direction that shines light valve 2 and the light of central portion equates and makes it overlapping, forms uniform Illumination Distribution.For example, when the shape of 9g of concavity portion and the 9h of concavity portion was identical, as shown in figure 33, the illumination step-down of the central portion of light valve 2 produced uneven illumination.Therefore, need make the aperture area of the 9h of concavity portion greater than the 9g of concavity portion.In Figure 33, the regional 32b on the rayed light valve 2 that penetrates from the 9g of concavity portion, the regional 32a on the rayed light valve 2 that penetrates from the 9h of concavity portion.

Figure 34 has represented to consider the occulter 9T of contrast and the shape of 9B.The 9i of concavity portion is formed in the unit (V1H1), and to form the right-angle triangle peristome, the Illumination Distribution on the light valve 2 is even.But, according to Figure 31, because the light quantity by unit (V1H1) is less, so when the signal of video signal that shows 100% on screen, less owing to light quantity, the image of projection on screen can not get enough contrasts.

According to above situation, on light valve 2, do not produce uneven illumination in order to make usually, peristome need be about 8 unit.But,, can utilize about 4 unit to make and on light valve 2, not produce uneven illumination by considering shape and the relative light amount ratio that incides opening.Promptly, the summit on the x direction of the bigger 9h of concavity portion of aperture area as near the x direction center of the unit (V1H1) of optical axis C, the summit of the less 9g of concavity portion of aperture area as near the unit (V1H1) of optical axis C and the junction surface between the unit (V2H1) that the opposite side of optical axis C is adjacent, can utilize about Unit 4 to make thus and on light valve 2, not produce uneven illumination, and improve contrast.

Figure 35 be expression occulter 9T and the 9B rotational angle when being shape shown in Figure 30 with relative light amount ratio between the figure of relation.Curve 331 is analog results of the rotating mechanism 9a of shape shown in Figure 30.Curve 330 is the analog results of the rotating mechanism 9a when not forming the shape of concavity shown in Figure 8 portion.For easy comparison, moving curve 330 makes it to overlap with curve 331.Can confirm according to Figure 35, form shape shown in Figure 30, can realize roughly continuous light quantity adjusting light valve 2 with respect to rotational angle by making occulter 9T and 9B.Therefore, form shape shown in Figure 30, can realize that continuous light amount regulates, and can not make on the light valve 2 and produce uneven illumination, and can improve contrast by the leading section shape that makes

occulter

9T and 9B.

Illustrate elliptical shape in the present embodiment, if but consider aperture area and the vertex position identical with present embodiment, then triangle also can obtain same effect.

Figure 36 represents the shape of occulter 9T and 9B.The concavity portion of the front end of

occulter

9T and 9B forms triangle.The feature of shape shown in Figure 36 be when relative light amount ratio 30% when following, can carry out light quantity meticulously and regulate.By the both sides on the x direction that the 9g of concavity portion is configured in the second lens arra 4b, can control the lower part of relative light amount ratio meticulously.And, shown in Figure 36 triangular shaped though fully the use element number of the second lens arra 4b during shading is less by forming, and irradiation area is overlapped, the Illumination Distribution on the light valve 2 is become evenly, so can not produce uneven illumination.

Figure 37 be expression occulter 9T and the 9B rotational angle when being shape shown in Figure 36 with relative light amount ratio between the figure of relation.Curve 351 is analog results of the rotating mechanism 9a of shape shown in Figure 36.Curve 350 is the analog results of the rotating mechanism 9a under the shape shown in Figure 38.For easy comparison, moving curve 350 makes it to overlap with curve 351.Can confirm according to Figure 37, form shape shown in Figure 36 by making

occulter

9T and 9B, be to become the mild curve of degree of tilt near 10%～30% the time in relative light amount ratio.As the reason that forms this flat curve, at the rotational angle of rotating mechanism 9a hour, the lens unit of V1H1 shown in Figure 31 is by shading, so can reduce illumination change.In relative light amount ratio is in 10%～30% the lower region, and people's the visual sensitivity that relative light amount ratio is changed is very high, so the careful light quantity of being undertaken by rotating mechanism 9a is regulated very important.Therefore, by forming shape shown in Figure 36, can control the light quantity adjusting that relative light amount ratio is lower than at 30% o'clock more meticulously.

According to the above, form shape shown in Figure 36 by making

occulter

9T and 9B, when light amount ratio is low relatively, also can carries out careful light quantity and regulate.

Claims

1. a projection display device is characterized in that, this projection display device has:

Light valve;

Light source, its generation shines the light on the described light valve;

Integration lens, it is configured on the light path between described light source and the described light valve, the Illumination Distribution homogenising of the light on making from described light source irradiation to described light valve; With

Light intensity adjusting mechanism, it is configured on the described light path, has a pair of occulter that rotates in the mode that splits around door, the light quantity of the light on this a pair of occulter is used to regulate from described light source irradiation to described light valve,

Described occulter forms and be bent into " く " shape on the direction that light quantity is reduced.

2. projection display device according to claim 1 is characterized in that described occulter forms leading section and is cut into concavity portion.

3. projection display device according to claim 1 and 2 is characterized in that, described occulter forms leading section and is cut into tooth shape shape portion.

4. a projection display device is characterized in that, this projection display device has:

Light valve;

Light source, its generation shines the light on the described light valve;

Described occulter forms leading section and is cut into tooth shape shape portion.

5. projection display device according to claim 4 is characterized in that described occulter forms leading section and is cut into concavity portion.

6. according to claim 1 or 4 described projection display devices, it is characterized in that described integration lens is made of first lens arra of being located at described light source side and second lens arra of being located at described light valve side,

Described occulter is configured between described first lens arra and described second lens arra, and rotates in the direction that opens and closes towards described first lens arra.

7. projection display device according to claim 6 is characterized in that, the rotation axis of described occulter and is configured near described second lens arra between described first lens arra and described second lens arra.

8. according to claim 1 or 4 described projection display devices, it is characterized in that the size of two radius of gyration directions of described a pair of occulter is greater than the size of described integration lens.

9. according to claim 2 or 5 described projection display devices, it is characterized in that described concavity portion forms the concavity curve shape.

10. according to claim 2 or 5 described projection display devices, it is characterized in that described concavity portion forms parabolic shape.

11., it is characterized in that described concavity portion forms half-oval shaped according to claim 2 or 5 described projection display devices.

12., it is characterized in that described concavity portion forms triangle according to claim 2 or 5 described projection display devices.

13., it is characterized in that described concavity portion is formed with a plurality of according to claim 2 or 5 described projection display devices on described occulter.

14. projection display device according to claim 13, it is characterized in that, described concavity portion comprises two concavity portions that area is different, and these two concavity portions are formed on each described occulter, and is located at described occulter point-symmetric position of relative optical axis when closed.

15. projection display device according to claim 14, it is characterized in that, in the xyz of following hypothesis coordinate system, this coordinate system is by constituting as the x axle of horizontal direction and the y axle as vertical direction of relative described z axle and described x axle quadrature as the z axle of described optical axis direction, described relatively z axle quadrature, in the described concavity of different two of area portion

The summit of the described concavity portion of aperture area the greater is positioned at the y direction of principal axis at lens unit center, this lens unit is arranged in described second lens arra x direction of principal axis of approaching described optical axis, the summit of aperture area smaller's described concavity portion is positioned at the y direction of principal axis of connecting portion, to another lens unit, this another lens unit is on the x axle and in the side opposite with described lens unit of described optical axis from described lens unit for this connecting portion.

16. a projection display device is characterized in that, this projection display device has:

Light valve;

Light source, its generation shines the light on the described light valve;

Described occulter forms the concavity portion that leading section is cut into the concavity curve shape, described concavity portion comprises two concavity portions that area is different, these two concavity portions are formed on the described occulter, and are located at the described occulter point-symmetric position of relative optical axis when closed.

17. projection display device according to claim 16, it is characterized in that, in the xyz of following hypothesis coordinate system, this coordinate system is by constituting as the x axle of horizontal direction and the y axle as vertical direction of relative described z axle and described x axle quadrature as the z axle of described optical axis direction, described relatively z axle quadrature, in the described concavity of different two of area portion