JP2000098324A - Projection type liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts, to facilitate the regulation, to reduce the size and weight and to facilitate for making have high resolution by splitting the light from a light source part to plural optical paths, modulating the light rays of the plural optical paths by each of plural panel units, synthesizing these light rays and projecting the light. SOLUTION: A projector 100 splits the light from the light source part 10 having a light emitting part 11 and a reflector 12 into the two optical paths by a beam splitter 20 which divides the optical paths as a light separating element. The light transmitted through the beam splitter 20 is made incident as it is on an optical modulation part 40 and the light reflected by the beam splitter 20 is reflected by a mirror 30 and is made incident on the optical modulation part 40. The light modulated in the optical modulation part 40 is reflected by mirrors 50, 70, is synthesized by an optical synthesizing element 60 and is macroprojected to a screen by a projection lens 80. The optical modulation part 40 forms the two liquid crystal panel units commonly having a single transparent substrate and modulates the light by the respective liquid crystal panel units.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type liquid crystal display device, in which light from a light source is modulated by a light modulator provided with a liquid crystal panel, and the light modulated by the light modulator is projected onto a screen by a projection lens. The present invention relates to a projection type liquid crystal display device that performs enlarged projection.

[0002]

2. Description of the Related Art Conventionally, such a projection display device (hereinafter referred to as a projector) has a configuration as shown in FIGS. FIG. 29 is a diagram (1) showing a conventional technique, and shows a projector 250 of a three-plate system.

The projector 250 separates light from the light source unit 10 into three primary colors of red (R), green (G), and blue (B) by dichroic mirrors 9A and 9B, and separates the respective color lights into liquid crystal panels 4R and 4G. , 4B. The R, G, and B color lights are modulated according to image signals input to the liquid crystal panels 4R, 4G, and 4B, respectively.
A ′ and 9B ′ are combined and enlarged and projected from the projection lens 80 to a screen (not shown).

FIG. 30 is a diagram (2) showing a conventional technique, and shows a single-plate type projector 260. The projector 260 emits light from the light source unit 10,
Three dichroic mirrors having different reflection characteristics depending on the wavelength (color) are separated into three primary colors by color separation means 9C arranged at an angle with respect to the optical axis. Each of the separated color lights goes to a single liquid crystal panel 4 having R, G, and B dots, and a microlens array 7 is arranged on the incident side of the liquid crystal panel 4. The incident angle of each color light incident on the microlens array 7 is different because the angle of the dichroic mirror for color separation is shifted, and they are one pixel of the liquid crystal panel 4 (consisting of R dots, G dots, and B dots). When the light is incident on one unit of the lens corresponding to the above, each color light is imaged and incident on each of the R dot, G dot, and B dot of the liquid crystal panel 4.
Each color light modulated by the liquid crystal panel 4 according to image data is enlarged and projected from the projection lens 80 to a screen (not shown).

[0005]

The first problem is as follows.
The above-described three-panel projector 250 shown in FIG. 29 has a problem that the number of components such as a liquid crystal panel and various mirrors increases, and the size of the apparatus increases. In addition, there is a problem that it takes time to perform assembly adjustment such as alignment of the three liquid crystal panels and various mirrors.

[0006] In the projector 260 of FIG.
Since the three primary colors of R, G, and B must be formed on one panel, when the number of display pixels increases, the size of the panel itself must be increased. Therefore, a large-diameter projection lens is required. Therefore, there is a problem that the size of the optical component is increased and the size of the device is increased and the cost is increased. Conversely, if the number of pixels is increased with the same panel size, the size of each dot becomes smaller (the aperture ratio decreases), and there is a problem that the display quality deteriorates. In other words, there is a problem that it is difficult to increase the resolution.

As a second problem, in the above-mentioned conventional technique, polarizing plates are arranged on both the incident side and the emitting side of the liquid crystal panel, and non-polarized light from the light source unit is passed through the polarizing plate. Approximately half of the polarized light is absorbed and converted to linearly polarized light for use. Therefore, there is a problem that light use efficiency is poor. In addition, there is a problem that a means for cooling the polarizing plate is required, the number of parts is increased, and the size of the apparatus is increased.

In order to solve such a problem, non-polarized light from a light source section is separated into two orthogonal linearly polarized lights by a polarization separating element formed of a dielectric thin film or the like.
There is a method in which each linearly polarized light is modulated by a different liquid crystal panel (modulation by two systems), then combined, and an image is superimposed and projected. Further, in this system, when a three-plate system as shown in FIG. 29 is used for each of the two systems, a single-plate system as shown in FIG. 30 may be used.

Usually, the light source section comprises a light emitting section 11 and a reflector 12, as shown in FIG. 29 or FIG. Since the light emitted from the light emitting unit 11 includes infrared rays and ultraviolet rays which are harmful to the liquid crystal and are unnecessary for display, the reflector is formed with a multilayer film which reflects only visible light. Since the reflection characteristics of the multilayer film change depending on the incident angle, the wavelength of the light, the polarization direction, and the like, the light emitted from the light source unit 10 has an intensity distribution depending on the color (wavelength), the polarization direction, and the like. This is not so problematic because only one type of polarization is used. However, as in the above-described modulation method using two systems, a projection image is formed by superimposing images using both types of polarization. In such a case, there is a problem that color unevenness is emphasized and the display quality is degraded.

In particular, in a system in which each color light is angle-separated by three dichroic mirrors, in addition to the above-mentioned color unevenness by the reflector, three dichroic mirrors arranged at an angle shifted with respect to the optical axis, or Since the diffraction characteristics and the polarization characteristics of the prism used for the same function are added, the color unevenness is further increased and the display quality is deteriorated.

Therefore, according to the present invention, the projection type liquid crystal display device has a small number of parts, is easy to adjust, is small in size and light in weight, is a projection type liquid crystal display device in which high resolution can be easily achieved, and has little color unevenness. An object is to realize a projection-type liquid crystal display device having good display quality.

[0012]

In a projection type liquid crystal display device according to the present invention, a light source section, an optical path dividing means for dividing light from the light source section into a plurality of optical paths, and a plurality of panel units on a common substrate. A light modulating unit formed and modulating light in a plurality of optical paths by each of the plurality of panel units; a light combining unit combining light modulated by the light modulating unit; and a projection unit projecting light combined by the light combining unit. To solve the above problem.

Further, in the projection type liquid crystal display device according to the present invention, a light source unit, polarization separating means for separating light from the light source unit into two orthogonal linearly polarized lights, and a light modulation unit for modulating the two linearly polarized lights, respectively. A polarization combining unit that combines the lights modulated by the light modulation unit, a projection unit that projects the light combined by the polarization combining unit, and a light that is arranged and interposed between the light source unit and the polarization separation unit. And a polarization direction conversion element for converting the polarization direction of the above.

Further, in the projection type liquid crystal display device of the present invention, the light source section, the polarization separating means for separating the light from the light source section into two orthogonal linearly polarized lights, and the two light sources respectively modulating the two linearly polarized lights. A liquid crystal panel having a liquid crystal panel, a polarization combining unit that combines the lights modulated by the light modulation unit, a projection unit that projects the light combined by the polarization combining unit, and a light modulation unit. And a moving means for moving in the in-plane direction to solve the above problem.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Principle of the Invention] FIGS. 1 and 2
1 is a principle diagram of the present invention. Projector 1 shown in FIG.
At 00, light from the light source unit 10 including the light emitting unit 11 and the reflector 12 is split into two optical paths by a beam splitter 20 that splits an optical path as a light separating element. The light transmitted through the beam splitter 20 is used as it is by the light modulator 4.
The light that has entered the beam splitter 20 and reflected by the beam splitter 20 is reflected by the mirror 30 and enters the light modulation unit 40. The light modulator will be described later. The light modulated by the light modulator 40 is reflected by the mirrors 50 and 70 and combined by the light combining element 60, and is enlarged and projected by the projection lens 80 on a screen (not shown).

FIGS. 2A and 2B are views showing the light modulating section 40 of FIG. 1. FIG. 2A is a plan view of the light modulating section 40, and FIG. 2B is a view showing a synthesized projected image. As shown in FIG.
The light modulating unit 40 includes two liquid crystal panel units 43 and 44 in which a single transparent substrate 42 is used in common and liquid crystals are sealed in individual transparent substrates. (Hereinafter, the combination of the two panel units will be referred to as a "single-panel twin panel.") The lights modulated by the respective panel units 43 and 44 are combined as described above to form a projected image. FIG.
(B) shows the synthesized projected image,
In the synthesized image, a pixel Pi1 is formed by the dots R1, G1, and B1, and a pixel Pi2 is similarly formed by the dots R2, G2, and B2. Referring back to FIG. 2A, the panel units 43 and 44 can be configured by a known active matrix liquid crystal panel, and each pixel unit 4
Any of the dots R, G, and B constituting the pixel Pi is formed at 5, 46. As an example, of the dots R1, G1, and B1 that constitute the pixel Pi1, the dots R1 and B1
1 is formed in the pixel section 45 of the panel unit 43, and the dot G1 is formed in the pixel section 46 of the panel unit 44. In other words, every other dot is formed in one panel unit in the usual order of the dot arrangement R, G, B of each color, and the rest is formed in the other panel unit.

In addition, when the images are combined, the image of one panel unit is vertically inverted by a mirror and combined, so that the image of the top line on the page of the panel unit 43 is the image of the panel unit 44 on the page. It will be combined with the image of the bottom line. Therefore, the arrangement of the dots is arranged upside down in the panel units 43 and 44, and the panel unit 43 is also driven sequentially from the upper line as shown by the arrow 47a in the panel unit 43. Are driven sequentially from the lower line as shown by the arrow 47b.

As described above, by forming a plurality of panel units (two in the above example) on a single common substrate, the positional accuracy of the plurality of panels is improved, and therefore, the position accuracy of the plurality of panels is improved. Positioning or adjustment becomes easy. Further, since a plurality of panels are integrated, the number of parts is reduced, and the size and weight can be reduced. further,
On the other hand, in the panel unit, one set of R, G, and B dots may be formed every other dot, so that a margin between dots can be provided, and even if the resolution is increased (high definition), each dot of each dot can be formed. The aperture ratio can be increased, and the display quality becomes bright and good. Furthermore, since a margin between dots can be provided, when configuring a panel having the same number of pixels,
Since the size of the panel unit can be reduced, it is possible to use small optical components such as a projection lens, so that the size and weight can be reduced, and the cost can be reduced. [Embodiments of the present invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a diagram showing a first embodiment of the present invention. A projector 110 according to the first embodiment shown in FIG. 3 includes a light emitting unit 11 and a light emitting unit 11 including a paraboloid.
Non-polarized light is emitted from a light source unit 10 including a reflector 12 that converts light from the light into substantially parallel light. Non-polarized light is converted into a plate-shaped polarization separation element 2 having a polarization separation / synthesis function.
0 separates the light into P-polarized light and S-polarized light. The P-polarized light transmitted through the polarization splitting element enters one panel unit 43 of the light modulation element 40. The polarization separation element 20
The S-polarized light reflected by is reflected by the mirror 30 and enters the other panel unit 44 of the light modulation element 40. The light modulation element 40 is the one shown in FIG. Further, a polarizing plate is arranged on the emission side of the panel units 43 and 44 so as to transmit the modulated and polarized light, but is not shown. Also in the following description of the embodiment, although not shown, a polarizing plate is actually arranged.

Here, a microlens array 4 serving as a condensing element is provided on the incident side of each panel unit of the light modulating element 40.
01 is arranged. This micro lens array 40
According to 1, the amount of light incident on each dot of the panel unit can be increased, and the substantial aperture ratio can be increased. The light modulated and emitted by the panel unit 43 becomes S-polarized light, and after being reflected by the mirror 50, becomes λ / 2.
The light enters the plate 72 and is converted into P-polarized light, and then enters the plate-shaped polarization combining element 60 having a polarization separation / combination function. The light modulated and emitted by the panel unit 44 becomes P-polarized light,
After passing through the polarization combining element 60, the light is reflected by the mirror 70, is converted into S-polarized light by passing twice through the λ / 4 plate 71, and enters the polarization combining element 60.

The polarization combining element 60 transmits P-polarized light and
The light is synthesized by reflecting the polarized light, and the projection lens 8 is formed.
From 0, the image is enlarged and projected on a screen (not shown). This first
In the embodiment, since the polarization is separated and synthesized, the light use efficiency is high, and a bright and good projected image can be obtained. FIG. 4 is a diagram showing a second embodiment of the present invention.

The projector 120 of the second embodiment shown in FIG. 4 differs from the projector 110 of FIG. 3 in the position of the λ / 2 plate 72 ′. That is, in the projector 120 of the present embodiment, the λ / 2 plate 72 ′ is attached to the emission side of the substrate 42 of the light modulation unit 40 </ b> A. In the second embodiment, since the λ / 2 plate 72 ′ is integrated with the light modulator 40 A, the number of parts can be reduced.

FIG. 5 is a diagram showing a third embodiment of the present invention. The projector 130 according to the third embodiment shown in FIG. 5 includes the projector 110 of FIG.
, Polarization separating element 20A and polarization combining element 60A
And the configuration of the prism mirror 50A is different. In other words, the light source unit 10A includes the parabolic reflector 12
The light is condensed by A, passes through the aperture element 14, and then passes through the collimator lens 15, thereby forming a light beam with higher parallelism. The light that has passed through the collimator lens 15 has its optical path changed by the mirror 16 and enters the polarization splitting element 20A.

The polarization splitting element 20A is composed of a beam splitter (PBS) composed of a prism.
Is separated into P-polarized light and S-polarized light. The light emitted from the panel unit 43 enters the prism mirror 50A, and is reflected by total reflection of the prism. By using the prism mirror 50A, the polarization separation element 20A
It is possible to match the optical path lengths of the two optical paths separated by.

Further, similarly to the polarization splitting element 20A, the polarization synthesizing element 60A is also composed of a beam splitter (PBS) composed of a prism, and P-polarized light and S-polarized light are synthesized by the polarization synthesizing surface 61. FIG. 6 is a diagram showing a fourth embodiment of the present invention. The projector 140 according to the fourth embodiment shown in FIG. 6 is different from the projector 110 shown in FIG.
The configuration of the light source unit 10A and the polarization combining system 60B are different.

That is, the light source unit 10A is the same as that shown in FIG. 5, and can obtain light with high parallelism. The polarization combining system 60B includes two polarization combining elements 63.
The S-polarized light emitted from the panel unit 43 is disposed between the two panel units 43 and 44, and the S-polarized light emitted from the panel unit 43 is reflected by the mirror 64, then travels to the polarization combining element 63, is reflected by the polarization combining element 63, and is projected. Head to lens 80. The P-polarized light emitted from the panel unit 44 is
After being reflected at 2, the light goes to the polarization combining element 63, passes through the polarization combining element 63, and goes to the projection lens 80. The angle between the mirrors 62 and 64 is 60 °.

With such a configuration, the light modulator 40
It is not necessary to provide a wave plate between the projection lens and the projection lens, and the number of parts can be reduced. FIG.
It is a figure showing a 5th embodiment of the present invention. As shown in FIG.
The projector 150 according to the fifth embodiment is different from the projector 110 in FIG. 3 in the configuration of the polarization separation element 20A and the configuration of the polarization combining system 60C.

That is, the same polarization separating element 20A as that shown in FIG. 5 is used. The polarization combining system 60C includes a beam splitter PB composed of a prism.
S, and the apex angle of the prism is 60 °. The polarization combining surface 67 is orthogonal to the panel between the two panel units of the light modulation element 40, and the P-polarized light and the S-polarized light emitted from the panel unit are reflected by the total reflection of the prism. The light is combined and exits the prism PBS, and travels to the projection lens 80.

At this time, since the apex angle of the prism PBS is set to 60 °, the light emitted from the prism PBS is emitted perpendicular to the emission surface. Therefore, the image of the light modulation element 40 viewed from the projection lens 80 is enlarged and projected by the projection lens without inclination. FIG. 8 is a diagram showing a modification of the fifth embodiment of the present invention. A modification of the fifth embodiment shown in FIG. 8 is a case where the prism PBS in FIG. 7 has a shape other than the vertical angle of 60 °. In such a case, by using the correction prism, it is possible to achieve a configuration equivalent to the case where the light emitted from the prism is emitted perpendicularly from the emission surface.

That is, in FIG. 8A, the apex angle of the prism PBSa constituting the polarization combining system 60D is set to 80 °.
(Θ1 = 40 °), and a correction prism 68a having an apex angle θ2 of 30 ° is arranged. In FIG. 8B, the vertex angle of the prism PBSb constituting the polarization combining system 60E is 50 ° (θ3 = 22.5 °), and the vertex angle θ4 is 2 °.
A 2.5 ° correction prism 68b is provided.

FIG. 9 is a diagram showing a sixth embodiment of the present invention. A projector 160 according to the sixth embodiment shown in FIG. 9 is a colorization of the projector 130 shown in FIG. That is, the light emitted from the light source unit 10B is divided into R, G, and B light by the color separation element 90 by the angle separation of three dichroic mirrors 91, 92, and 93.
Separated into primary colors. Here, the light source unit 10B and the color separation element 90 are described on the same plane as other members for convenience of explanation, but are actually twisted by 90 °, and light from the light source unit 10B to the color separation element 90 is Perpendicular to
Therefore, the direction of the color separation by the color separation means 90 is also a direction perpendicular to the paper surface.

In the polarization separating element 20A, the polarization combining element 60A, or the dichroic mirrors 91, 92, 93 of the color separating element 90, the transmission characteristic and the reflection spectrum characteristic are P-polarized light and S-polarized light. May be different. For this reason, in the present embodiment, the correction filter 17 is inserted in the light source unit 10B so that the outgoing light of P-polarized light and S-polarized light have the same spectral characteristics.

Further, the light modulating element 40B has a microlens array 40 on the incident side of the panel units 43 and 44.
1 and R, G,
Each color light of B is efficiently incident on the dots of each panel unit 43, 44. This detailed configuration will be described later. With this configuration, a bright projected image can be obtained.

In this embodiment, the light emitted from the polarization combining element 60A passes through the field lens 81 and enters the projection lens. FIG.
It is a figure showing a 7th embodiment of the present invention. The projector 170 according to the seventh embodiment shown in FIG.
A color separation method different from that of the projector 160 is adopted.

That is, the projector 170 of the present embodiment
In FIG. 9, there is no color separation element 90 for performing color separation by the projector 160 in FIG. 9, and light from the light source unit 10C including the correction filter 17 is incident on the polarization separation element 20A. Further, the color separation method in the projector 170 of the present embodiment is performed by the one-dimensional diffraction grating element 401b arranged on each of the incident sides of the panel units 43 and 44 of the light modulation unit 40C. 40
Reference numeral 1b denotes a structure in which a diffraction grating and a microlens array are integrated, and has a function as a diffraction grating and a function as a microlens. This detailed configuration will be described later.

FIG. 11 is a diagram showing an eighth embodiment of the present invention. The projector 180 according to the eighth embodiment shown in FIG. 11 is different from the projector 160 shown in FIG.
A different color separation method from that of the projector 170 is adopted. That is, the projector 170 of the present embodiment
Here, the hologram element 401c disposed on each of the entrance sides of the panel units 43 and 44 of the light modulation unit 40D
It is done in. This detailed configuration will be described later.

FIG. 12 is a diagram showing a light modulation unit according to the embodiment of the present invention. FIG. 12A shows the light modulation unit 4 in FIG.
0B, and (b) shows the light modulator 40C in FIG.
(C) shows each of the light modulating units 40D in FIG. FIG. 12A shows a microlens array 40.
1a. A liquid crystal layer 49 is sealed between a common substrate 42 of the single-panel twin panel and one of the panel units (substrate) 43, and R dots, G dots, and B dots are formed.

A microlens array 401a is disposed on the incident side of the panel unit (substrate) 43, and the microlens array 401a is constituted by three dichroic mirrors shown in the color separation element 90 of FIG. Each color light, which is angle-separated by the various color separation elements, becomes red light I _B ,
Green I _G, the microlens array 40 as blue light I _B
1a at different angles.

Each color light incident on the microlens array 401a also enters the microlenses 402 constituting the microlens array 401a at different angles. Since the micro lens 402 is arranged corresponding to one pixel area composed of R dots, G dots, and B dots, each color light incident on the micro lens 402
An image is formed and incident on dots of the corresponding colors.

With this configuration, a color image can be obtained. FIG. 12B shows a diffraction grating element 401b.
Is used. A diffraction grating 403 is provided on the incident side of one panel unit (substrate) 43 of the single-panel twin panel.
And a diffraction grating element 401b composed of a microlens array 401a.

The diffraction grating 403 is a one-dimensional diffraction grating. When white light I is obliquely incident on the diffraction grating 403, R,
The light is separated into three primary colors of G and B, and emitted at different angles depending on the color light. Each color light emitted from the diffraction grating 403 enters the microlens array 401a, and forms and enters dots of the corresponding colors as described above. With such a configuration, a color image can be obtained.

FIG. 12C uses a hologram 401c. A hologram 401c having a microlens function is arranged on the incident side of one panel unit (substrate) 43 of the single-panel twin panel. When the white light I is obliquely incident on the hologram 401c, the white light I is separated into three primary colors of R, G, and B by the hologram element 404, which is a constituent unit, and condensed while being emitted at different angles by the color light.
An image is formed and incident on dots of the corresponding colors.

With such a configuration, a color image can be obtained. FIG. 13 is a diagram showing a ninth embodiment of the present invention. The projector 190 according to the ninth embodiment shown in FIG. 13 is basically the same as the projector 160 according to the sixth embodiment in FIG. 9 except that the spectrum of the luminous flux in the P-polarized light and the S-polarized light is the same. The number of times that each light beam transmits and reflects through the wave plate and the polarization separation / combination prism (PBS) is configured to be the same.

The white light from the light source is color-separated in the horizontal direction on the paper surface by the color separation element 24 composed of three dichroic mirrors and then passes through the λ / 2 plate 22 to be composed of three dichroic mirrors. The color separation element 23 separates the color in the direction perpendicular to the paper. Each of the color-separated light beams enters a polarization separation element 20B composed of a prism, and is separated by S
Polarized light is reflected and P-polarized light is transmitted. The reflected S-polarized light is
The light reflected by the mirror 24 and passed through the λ / 4 plate 25 twice is converted into P-polarized light, and the light modulated by the light modulator 40E is emitted as S-polarized light. Light modulator 40E
The S-polarized light that has exited from the mirror prism 50B has a reflection surface 51.
, And is converted into P-polarized light through the λ / 2 plate, passes through the combining surface 61 of the polarization combining element 60A composed of a prism, and reaches the projection lens 80 via the field lens 81.

The transmitted P-polarized light is transmitted through the λ / 2 plate 26 and converted into S-polarized light, and is reflected by the reflecting surface 3 of the mirror prism 30A.
The light reflected by 1 and modulated by the light modulator 40E is emitted as P-polarized light. The P-polarized light emitted from the light modulating unit 40E passes through the combining surface 61 of the polarization combining element 60A, and is
The light is converted into S-polarized light by passing through the λ / 4 plate 71 twice, and is reflected by the combining surface 61 to reach the projection lens via the field lens 81.

With this configuration, the number of times that the S-polarized light and the P-polarized light that enter the projection lens are transmitted or reflected by the wave plate, the polarization separation / combination surface, and the like, respectively, are equal, so that the projection image Color unevenness can be reduced, and good display quality can be obtained. FIG. 14 shows the single-plate twin panel 410 of FIG.
FIG.

The single-panel twin panel 410 has a first panel unit 410a and a second panel unit 410b, each of which comprises a gate driver 411a, a data driver 412a, and a gate driver 411b, a data driver. 412b. Each of the panel units can be composed of, for example, an active matrix liquid crystal panel, and dots of each color are formed on one of the panel units 410a and 420b.

Also, when the images of the panel units are combined, the image of one unit is vertically inverted and combined with the image of the other unit. As shown by, the panel unit 410a is sequentially driven in a scan direction going downward from a line above the unit, and the panel unit 410b is sequentially driven in a scan direction going upward from a line below the unit.

The scanning direction or the image display direction may be upside down, left or right depending on how the optical system is assembled. FIG. 15 is a diagram illustrating an example (1) of a dot array of the single-panel twin panel of FIG. 14, (a) illustrating a composite image, (b) illustrating a dot array of one panel unit, (C) is a diagram showing the relationship between the arrangement of element units and dots when a hologram having a microlens function is arranged, and (d) is the arrangement of element units and dots when a microlens array is arranged. It is a figure showing a relation.

As shown in FIG. 5A, in the composite image, one pixel Pi1 has dots R1, G1, and B1 arranged in this order, and the pixels Pi are arranged in a square. (B) As shown in the figure, R, G, B
Is assigned to each vertical column,
On the other hand, one panel unit has a stripe-like arrangement arranged for every dot of one vertical line.

(C) As shown in the figure, the hologram element unit 421a having a microlens function has a center at G
As shown on the dots, they are arranged so as to correspond to the B, G, and R dot groups, and each color light separated in the horizontal direction enters each corresponding dot. (D) As shown in FIG.
2a, the center is on a dot other than the G dot, and R,
The color lights arranged in the B and G dot groups and separated in the horizontal direction are incident on the corresponding dots.

In the figures (c) and (d), when the spectral (color separation) element is a hologram or a one-dimensional diffraction grating, the light is dispersed so that the wavelengths are continuous, so that the G dot is divided into element units. You need to be in the center. On the other hand, when the spectral (color separation) element uses three dichroic mirrors, there is no particular limitation, and the center of the unit element (lens) may be located on any dot. (3
Depends on the arrangement of the dichroic mirrors. FIG. 16 is a diagram showing an example (2) of the dot arrangement of the single-plate twin panel of FIG. 14, (a) is a diagram showing a composite image,
(B) is a diagram showing a dot arrangement of one panel unit,
(C) is a diagram showing the relationship between the arrangement of element units and dots when a hologram having a microlens function is arranged, and (d) is a diagram showing the case where a microlens array is arranged.
FIG. 4 is a diagram illustrating a relationship between arrangement of element units and dots.

As shown in FIG. 5A, in the composite image, one pixel Pi1 has dots R1, G1, and B1 arranged in this order, and the pixels Pi are arranged in a square. (B) As shown in the figure, R, G, B
Are allocated for each vertical and horizontal dot, so that one panel unit has an arrangement similar to a checkered delta array arranged for each vertical and horizontal dot.

(C) As shown in the figure, the hologram element unit 421b having a microlens function has a center at G
As shown on the dots, they are arranged so as to correspond to the B, G, and R dot groups, and each color light separated in the horizontal direction enters each corresponding dot. (D) As shown in FIG.
Reference numeral 2b denotes a center located near the center of three dots similar to the delta arrangement, arranged so as to correspond to the R, B, and G dot groups, and each color light dispersed in three directions enters each corresponding dot. I do.

FIGS. 17A and 17B are diagrams showing an example (3) of the dot arrangement of the single-panel twin panel of FIG. 14, wherein FIG. 17A shows a composite image and FIG. 17B shows the dot arrangement of one panel unit. FIG. 9C is a diagram showing a modification of the dot arrangement of one panel unit. (A) As shown in the figure, one pixel Pi1 in the composite image
The dots R1, G1, B1 are arranged in this order, and the pixels Pi are arranged in a delta arrangement.

(B) As shown in the figure, since each panel unit allocates each horizontal line, one of the panel units has a stripe-like arrangement arranged for each horizontal line dot. (C) As shown in the figure, since each panel unit allocates each dot in the horizontal direction, one of the panel units is not linear, but resembles a stripe that is arranged for each dot of one vertical line. It becomes an array.

The arrangement of various spectral (color separation) elements is shown in FIG.
It becomes the same as the arrangement. FIG. 18 is a diagram illustrating an example (4) of the dot arrangement of the single-panel twin panel of FIG. 14, (a) illustrating a composite image, (b) illustrating a dot arrangement of one panel unit, (C) is a diagram showing the relationship between the arrangement of element units and dots when holograms having a microlens function are arranged, and (d) is a diagram showing the relationship between element units and dots when holograms having a microlens function are arranged. FIG. 9E is a diagram showing a modification of the arrangement relationship of FIG. 7E, and FIG. 9E is a diagram showing the arrangement relationship of element units and dots when a microlens array is arranged.

As shown in FIG. 7A, in the composite image, one pixel Pi1 has dots R1, G1, and B1 arranged in this order, and the pixels Pi have a delta arrangement. (B) As shown in the drawing, each panel unit allocates each dot in the horizontal direction for each dot, and has an array that extends in an oblique direction. (C) As shown in the figure, the element unit 421c of the hologram having the microlens function is arranged so as to correspond to the R, G, B dot group so that the center is on the G dot, and is arranged in the horizontal direction. Each of the separated color lights enters each corresponding dot.

As shown in (d), the element unit 422c of the hologram having a microlens function has a different shape from that of (c), and the R, G, and B are arranged such that the center is on the G dot. Are arranged so as to correspond to the dot group of
Each color light split in the horizontal direction enters each corresponding dot. (D) As shown in FIG.
3c are arranged so as to correspond to the B, R, and G dot groups, and each color light beam split in the horizontal direction enters each corresponding dot.

The shape of each element unit is the same as that of the element unit 421c shown in FIG. Some have a shape extending in the horizontal direction and split light in the horizontal direction. The latter can be used even in a configuration where the center is not on the G dot. FIG. 19 is a diagram showing a tenth embodiment of the present invention.

The projector 200 of the tenth embodiment shown in FIG. 19 performs luminance display (adjustment) with one polarized light, performs color display with the other polarized light, and combines them to perform bright color display. That's what we are trying to do. Light source unit 10
Unpolarized light emitted from the P-polarized light
The P-polarized light is separated into polarized light and transmitted, and is incident on one panel unit of the single-plate twin panel 410A of the light modulation unit 40F to be modulated. On the other hand, the S-polarized light is
And is incident on the color separation means 90A composed of three dichroic mirrors, and is split into R, G, and B color lights. The separated color lights are incident on the other panel unit of the single-plate twin panel 410A of the light modulation unit 40F and are modulated. The path in which the light modulated by each panel unit is synthesized and enlarged and projected is the same as in the above-described embodiment.

Here, the microlens array 4 is placed on the panel unit where the color light from the color separation element 90A is incident.
It is good to arrange 20A. FIG. 20 is a diagram showing the single-plate twin panel 410A of FIG. The single-panel twin panel 410A includes a first panel unit 410Aa and a second panel unit 410Ab, each of which includes a gate driver 411a, a data driver 412a, and a gate driver 411b, a data driver 412b. ing. Each panel unit can be composed of, for example, an active matrix liquid crystal panel. Single panel twin panel 4 of the present embodiment
In 10A, color display is performed by the panel unit 410Aa, and monochrome display is performed by the panel unit 410Ab. Therefore, panel unit 410Aa has R, G, B
Are formed.

When the images of the panel units are combined, the image of one unit is vertically inverted and combined with the image of the other unit. As shown by, the panel unit 410Aa scans downward from the line above the unit, and the panel unit 410Ab scans upward from the line below the unit.

The scanning direction or the image display direction may be upside down, left or right depending on how the optical system is assembled. 21A and 21B are diagrams illustrating an example (1) of the dot arrangement of the single-panel twin panel of FIG. 20, wherein FIG. 21A illustrates a composite image, and FIG. 21B illustrates a panel unit 410Aa
FIG. 3C shows a dot array of FIG.
It is a figure which shows the dot arrangement | sequence of Ab.

As shown in FIG. 9A, in the composite image, one pixel Pi1 has dots R1, G1, and B1 arranged in this order, and the pixels Pi are arranged in a square. (B) As shown in the figure, the panel unit 410Aa has the same dot (pixel) arrangement as the composite image. That is,
Color display is performed by the panel unit 410Aa.

(C) As shown in FIG.
10Ab is a white dot W corresponding to the size of the pixel Pi.
Is formed. With the W dots, the brightness is adjusted whether white display is performed or not (whether light is transmitted). With this configuration, a color display panel unit and a luminance adjustment (display) panel unit can be provided, and a bright display image can be obtained partially or entirely as necessary.

FIG. 22 is a diagram showing an example (2) of the dot arrangement of the single-panel twin panel of FIG. 20, (a) showing a composite image, and (b) showing a dot arrangement of the panel unit 410Aa. FIG. 3C is a diagram showing a dot arrangement of the panel unit 410Ab. (A) As shown in the figure, one pixel Pi1 in the composite image
In the figure, dots R1, G1, and B1 are arranged in this order, and pixels Pi are arranged in a square.

(B) As shown in FIG.
10Aa has the same dot (pixel) array as the composite image. That is, the color display is performed by the panel unit 410Aa.
Will be done. (C) As shown in the figure, the panel unit 410Ab
It has a W dot of the size of a unit dot, and the position of the W dot corresponds to the position of the G dot.

FIG. 23 is a diagram showing an example (3) of the dot arrangement of the single-panel twin panel of FIG. 20, (a) is a diagram showing a composite image, and (b) is a dot arrangement of the panel unit 410Aa. FIG. 3C is a diagram showing a dot arrangement of the panel unit 410Ab. (A) As shown in the figure, one pixel Pi1 in the composite image
Is composed of dots R1, G1, and B1, and the pixels Pi are in a delta arrangement.

(B) As shown in FIG.
10Aa has the same dot (pixel) array as the composite image. That is, the color display is performed by the panel unit 410Aa.
Will be done. (C) As shown in the figure, the panel unit 410Ab
It has a W dot of the size of a unit dot, and the position of the W dot corresponds to the position of the G dot.

In the panel unit 410Aa, elements such as a microlens array and a hologram can be provided. However, since the arrangement method is the same as in the above-described embodiment, the illustration is omitted here. FIG.
FIG. 4 is a diagram illustrating an adjustment method according to the embodiment of the present invention. FIG. 24 shows a partial configuration of the embodiment of the present invention, in which the light modulator 40 and the mirror 50 can be adjusted. Mirrors and λ / 2 plates 70, 71 and λ /
The two plates 72 are fixed.

As shown in the figure, the light modulating section 40 has an optical axis I
It can be rotated and adjusted in a plane perpendicular to a. The mirror 50 is orthogonal to the optical axis Ia, and the axis perpendicular to the plane of the drawing at the point where the optical axis Ia and the mirror 50 intersect, or the optical axis Ia and the mirror 5 are orthogonal to the optical axis Ia.
At the point where 0 crosses, it can be rotated and adjusted about a line parallel to the paper surface as an axis.

FIG. 25 is a diagram showing an eleventh embodiment of the present invention. In the projector 220 according to the eleventh embodiment shown in FIG. 25, the light from the light source 10 is color-separated (angle-separated) by a color separation element 90B including three dichroic mirrors. The R, G, and B color lights are emitted with a shift of 3 °. The light emitted from the color separation element 90B passes through a polarization direction conversion element 20C formed of a λ / 2 plate. The fast axis of the λ / 2 plate 20C is arranged so as to form an angle of 22.5 ° with respect to the color separation direction.
The light is emitted after being rotated by 5 °, and is incident on the polarization separation element 20A.

The light incident on the polarization splitting element 20A is separated into two orthogonal linearly polarized light components, reflected by mirrors 30 and 50, and after bending the optical path, the liquid crystal panel 40A.
H, 40H '. Liquid crystal panels 40H, 40H '
Are supplied with the same image signal. After forming the same image, the images of the two liquid crystal panels 40H and 40H 'are synthesized by the polarization synthesizing element 60A, and are enlarged and projected on a screen (not shown) via a projection lens. You.

In such a configuration, light from the light source enters the color separation element 90B at an angle of approximately 45 °. On this occasion,
The wavelength range of each color light is different between polarized light in the direction of color separation (P-polarized light) and polarized light in the direction perpendicular to the direction (S-polarized light). This is due to the property of the dichroic mirror that the cut wavelength shifts to the single wavelength side when the incident angle decreases, and the cut wavelength shifts to the long wavelength side when the incident angle increases.

In the present embodiment, when the light beam having the shifted characteristics is inserted by the polarization direction conversion element 20C, when the polarization light is separated by the polarization separation element 20A, the light ray is separated from each component by half. This makes it possible to prevent this wavelength (color) shift. In this embodiment, the incident P-polarized light and the S-polarized light are respectively linearly polarized light rotated by 45 ° using a λ / 2 phase difference plate as the polarization direction conversion element 20C. The same effect can be obtained by using a λ / 4 retardation plate and rotating clockwise and counterclockwise circularly polarized light, respectively.

Further, in this embodiment, the color separation element 90
Although B is composed of three dichroic mirrors, a similar problem occurs with a diffraction grating, a prism, or the like, and the same operation and effect can be obtained. FIG.
FIG. 14 is a diagram showing a twelfth embodiment of the present invention, wherein (a)
FIG. 2 is a diagram illustrating a configuration of a projector, and FIG. 2B is a diagram illustrating a polarization direction conversion element.

(A) As shown in FIG. 25, the projector 230 of the twelfth embodiment is different from the projector 230 of FIG.
20 and the polarization direction conversion element 20D are different. (B) shows a polarization direction conversion element 20D of the present embodiment. In the polarization direction conversion element 20D, the region 20Da where the λ / 2 phase difference plate is provided and the region 20Db where the λ / 2 phase difference plate is not formed have a predetermined size in a checkerboard pattern. They are arranged alternately at a pitch. The area ratio is 5 to 5.

The λ / 2 retardation plate in the region 20Da is arranged so that its fast axis has an angle of 45 ° with respect to the color separation direction, and the light passing through the region 20Da is polarized by 90 °. The light is emitted with its direction changed. In addition, the area 20
Db has no element for changing the polarization direction,
The light is emitted while the polarization direction at the time of incidence is maintained. Since the lights emitted from these two regions are not perfectly parallel lights, they start to mix after emitting the element 20D and completely mix by the time the light reaches the polarization splitting element 20A.

Therefore, similarly to the eleventh embodiment,
(Angle) When a light beam having characteristics shifted by the color separation element 90B is polarized and separated by the polarization separation element 20A, the wavelength (color) shift is prevented by separating the light components into halves. Becomes possible. Note that also in the present embodiment, the region 2 of the polarization direction conversion element 20D is used.
A similar effect can be obtained by using a λ / 4 retardation plate instead of a λ / 2 retardation plate as 0Da and using clockwise and counterclockwise circularly polarized light, respectively.

Further, in the present embodiment, the color separation element 90B is constituted by three dichroic mirrors. However, instead of this, a similar problem occurs with a diffraction grating, a prism or the like, and the same operation and effect are obtained. What can be obtained is the same as in the eleventh embodiment. FIGS. 27A and 27B are diagrams showing a thirteenth embodiment of the present invention, wherein FIG. 27A is a diagram showing the configuration of a projector, and FIG. 27B is a diagram showing a polarization direction conversion element.

(A) As shown in FIG. 25, the projector 230 of the thirteenth embodiment is different from the projector 230 of FIG.
20 and the polarization direction conversion element 20D are different. (B) shows a polarization direction conversion element 20D of the present embodiment. The polarization direction conversion element 20D is a disc-shaped λ / 2 phase difference plate, and is configured to be rotatable about the center as an axis.
When the conversion element 20D rotates, its fast axis rotates.

This rotation is performed by the liquid crystal panels 40H, 40H '.
, And rotates by 1/4 every frame. Each time the conversion element 20D rotates １ ／, its fast axis is inclined by ± 45 ° with respect to the color separation direction, so that the incident light beams of the liquid crystal panels 40H and 40H 'are alternately switched. . Since this exchange is performed in a short time, an averaged light beam is observed by a viewer. Therefore, the wavelength (color) shift is not observed.

FIG. 28 is a diagram showing a fourteenth embodiment of the present invention. The projector 240 according to the fourteenth embodiment shown in FIG. 28 includes vibrators 41I and 41I ′,
The liquid crystal panels 40I and 40I 'are moved in the in-plane direction. The liquid crystal panels 40I and 40I 'superimpose the images by shifting them by half a pixel and send different image data to each other, thereby realizing a display with twice the resolution.

In the above-described first to thirteenth embodiments, the polarization characteristics are neutralized by averaging the light rays incident on the two liquid crystal panels on one side and the other. It is averaged on the screen instead of the light rays incident on the panel. That is, the images of the liquid crystal panels 40I and 40I 'projected on the screen with a half pixel shift are moved by a distance of 1/4 pixel in the in-plane directions of the liquid crystal panels 40I and 40I' in mutually opposite directions. Thus, the positions of the images on both panels are interchanged. this is,
Vibrator 4 attached to liquid crystal panels 40I, 40I '
1I and 41I ', and operate in synchronization with the frame frequency of the image signal.

As described above, by changing the position on the screen where the liquid crystal panel forms an image every short time, the viewer can observe the averaged light beam. Therefore, the wavelength (color) shift is not observed. As the vibrator in the present embodiment, a piezoelectric element or the like, which can be easily controlled electrically, can be used. Alternatively, a mechanical mechanism such as a crank may be used.

Also, the replacement of the image on the screen is as follows.
In addition to moving the liquid crystal panel as in the present embodiment, it can be realized by moving the polarization combining element. Further, if the projection on the screen is performed by a projection lens provided for each liquid crystal panel, it can be realized by moving the projection lens.

[0088]

As described in detail above, according to the projection type liquid crystal display device (projector) of the present invention, by forming a plurality of panel units on a single common substrate, the positions of the plurality of panels can be reduced. Accuracy is improved, and thus alignment or adjustment with other optical components is facilitated. In addition, since a plurality of panels are integrated, the number of components is reduced, and the size and weight can be reduced.

Further, a margin between dots in the panel unit can be provided, and the aperture ratio of each dot can be increased even if the resolution is increased (higher definition).
The display quality is also bright and good. Further, since a margin between dots can be provided, when a panel having the same number of pixels is configured, the size of the panel unit can be reduced, so that a small optical component can be used. It is possible to reduce the weight and further reduce the cost.

Further, according to the projection type liquid crystal display device (projector) of the present invention, a wavelength (color) shift due to polarization characteristics is not observed, and a good projected image without color unevenness can be obtained. There is.

[Brief description of the drawings]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram illustrating a light modulation unit in FIG. 1;

FIG. 3 is a diagram showing a first embodiment of the present invention.

FIG. 4 is a diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a third embodiment of the present invention.

FIG. 6 is a diagram showing a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a fifth embodiment of the present invention.

FIG. 8 is a diagram showing a modification of the fifth embodiment of the present invention.

FIG. 9 is a diagram showing a sixth embodiment of the present invention.

FIG. 10 is a diagram showing a seventh embodiment of the present invention.

FIG. 11 is a diagram showing an eighth embodiment of the present invention.

FIG. 12 is a diagram illustrating a light modulation unit according to the embodiment of the present invention.

FIG. 13 is a diagram showing a ninth embodiment of the present invention.

FIG. 14 is a view showing the single-plate twin panel of FIG.

FIG. 15 is a diagram showing an example (1) of a dot array of the single-panel twin panel of FIG. 14;

FIG. 16 is a diagram showing an example (2) of a dot array of the single-panel twin panel of FIG. 14;

17 is a diagram illustrating an example (3) of the dot arrangement of the single-panel twin panel in FIG. 14;

FIG. 18 is a diagram illustrating an example (4) of a dot array of the single-panel twin panel in FIG. 14;

FIG. 19 is a diagram showing a tenth embodiment of the present invention.

FIG. 20 is a view showing the single-panel twin panel of FIG. 19;

21 is a diagram illustrating an example (1) of a dot array of the single-panel twin panel in FIG. 20;

FIG. 22 is a diagram illustrating an example (2) of the dot arrangement of the single-panel twin panel in FIG. 20;

FIG. 23 is a diagram illustrating an example (3) of the dot arrangement of the single-panel twin panel in FIG. 20;

FIG. 24 is a diagram illustrating an adjustment method according to the embodiment of the present invention.

FIG. 25 is a diagram showing an eleventh embodiment of the present invention.

FIG. 26 is a diagram showing a twelfth embodiment of the present invention.

FIG. 27 is a diagram showing a thirteenth embodiment of the present invention.

FIG. 28 is a diagram showing a fourteenth embodiment of the present invention.

FIG. 29 is a diagram (1) showing a conventional technique.

FIG. 30 is a diagram (2) showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Light source part 20 Optical path division | segmentation means (polarization separation element) 30 Reflection element 40 Light modulation part 50 Reflection element 60 Light synthesis means (Polarization synthesis element) 70 Reflection element 80 Projection means (projection lens)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Fumio Yamagishi 4-1-1, Kamidadanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Masato Nakajima 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture No. 1 Inside Fujitsu Limited (72) Hisashi Yamaguchi 4-1-1 Kamikadanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Toshihiro Suzuki 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Within Fujitsu Limited (72) Inventor Takeshi Goto 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside 1-1 Fujitsu Limited (72) Tetsuya Kobayashi 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Fujitsu Limited (72) Inventor Tetsuya Hamada 4-1-1 Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited Companies in the F-term (reference) 2H088 EA13 EA14 EA15 HA13 HA17 HA20 HA24 HA25 HA28 MA03 MA04 2H089 HA33 TA12 TA15 TA16 TA18 UA05

Claims (8)

[Claims] A light source unit; an optical path dividing unit that divides light from the light source unit into a plurality of optical paths; and a plurality of panel units formed on a common substrate. A light modulating unit that modulates each of the panel units, a light combining unit that combines light modulated by the light modulating unit, and a projection unit that projects the light combined by the light combining unit. Projection type liquid crystal display. 2. The projection type liquid crystal according to claim 1, wherein red dots, green dots, and blue dots forming one pixel are provided in different panel units of the plurality of panel units. Display device. 3. The projection type according to claim 1, wherein a red dot, a green dot, and a blue dot forming one pixel are provided in the same panel unit of the plurality of panel units. Liquid crystal display. 4. A color separation means for separating light from the light source unit into a plurality of color lights between the light source unit and a panel unit of the light modulation unit, wherein each of the separated color lights is a red dot, 4. The projection type liquid crystal display device according to claim 2, wherein the light is incident on green dots and blue dots. 5. A light source unit; a polarization separation unit that separates light from the light source unit into two orthogonal linearly polarized lights; a light modulation unit that modulates the two linearly polarized lights, respectively; A polarization combining unit that combines the modulated light; a projection unit that projects the light combined by the polarization combining unit; and a light emitting unit that is disposed between the light source unit and the polarization separation unit and converts a polarization direction of incident light. A projection-type liquid crystal display device comprising: 6. The projection type liquid crystal display device according to claim 5, wherein the polarization direction conversion element has a different conversion characteristic in a plane. 7. The projection type liquid crystal display device according to claim 5, wherein the polarization direction conversion element changes its conversion characteristic with time. 8. A light source unit, polarization separating means for separating light from the light source unit into two orthogonal linearly polarized lights, and a light modulator having two liquid crystal panels for modulating the two linearly polarized lights, respectively. A polarization combining unit that combines the lights modulated by the light modulation unit; a projection unit that projects the light combined by the polarization combining unit; and two liquid crystal panels of the light modulation unit in an in-plane direction. A projection type liquid crystal display device comprising: a moving unit for moving.