JP2002277960A - Liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize the color temperature of the optimum video specifications corresponding to use by a liquid crystal projector of only one kind of a model. SOLUTION: The liquid crystal projector separates the illumination light emitted by a lamp light source 1 into color light beams of R, G, and B through dichroic mirrors 7 and 8, converges them on the surfaces of liquid crystal panels 19, 18, and 20 by condenser lenses 12, 15 and 17, and modulates the respective color light beams with pieces of video information of the respective colors, and performs color composition by a dichroic prism 21 to project the resulting image as an enlarged image through a projection lens 22; and in this projector, a square mesh wire cloth 11 formed of wires which are arrayed in meshes and form a plurality of rectangular opening parts is arranged in the optical paths of one of the color light beams or a plurality of color light beams and the projector has an opening shape deforming means 11a which can reversibly and elastically deform the respective shapes of the opening parts according to whether external force is applied to the square mesh wire cloth 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector, and more particularly, to a liquid crystal projector which provides a control means for an amount of illumination light according to a use.

[0002]

2. Description of the Related Art An example of the configuration of a conventional liquid crystal projector is shown in FIG. As shown in FIG. 5, the divergent light from the light source lamp 1 is reflected by a reflector (for example, a parabolic reflector) 2 and guided toward a pair of fly-eye lenses 3 and 4, and reflected by reflection mirrors 5, 10, 14, and 16, condensing lenses 6, 9, 12, 13, 15, 17 and dichroic mirrors (color separation / reflection mirrors) 7, 8 converge on the liquid crystal panel surfaces 18 to 20 for video signal conversion. The condensed video signals of the three colors are then combined by a dichroic prism (color combining prism) 23 and enlarged and projected by a projection lens 22.

On the other hand, a liquid crystal projector device is generally divided into a theater specification and a presentation specification for each application, and the main difference between the two is a difference in set values of chromaticity. For example, the design value of the chromaticity of 100% white is set as follows in both cases.
1) In the case of the theater specification, x = 0.300, y = 0.330. 2) In the case of the presentation specification, x = 0.300, y = 0.350. Here, in the case of the theater specification, since it is compared with the conventional CRT type, the color temperature (chromaticity y value) is adjusted and controlled so as to match the chromaticity of the CRT at the expense of brightness. . On the other hand, in the case of the presentation specification, importance is placed on brightness, and in order to maximize the spectral characteristics of the light source lamp, the y value of the chromaticity is set to be large.

[0004]

Generally, Rch (R
(ed Channel: red light channel) Changing the amount of light greatly affects the change of the x value indicating the X coordinate side of the chromaticity coordinate axis, but does not lead to a large change of the color temperature (chromaticity y value). In addition, Bch (Blue Chan
The means for greatly changing the amount of light of the current light source (nel: blue light channel) is difficult to realize in the current light source lamp due to the problems of lamp spectral characteristics and light resistance. Therefore, when it is desired to adjust and control the color temperature (y value indicating the Y coordinate side of the chromaticity coordinate axis), normally, Gch (Green Ch) is used.
A method of setting and controlling the magnitude of the light amount of the light channel (green: green light channel) is employed. That is, the color temperature (chromaticity y
The value of the Gch color light amount is set to 1 by controlling the
When the value of 00% is set as the presentation specification, a method of setting and controlling the Gch color light amount to a value that is reduced from 100% to about 70% is set as the theater specification.

However, if chromaticity control is to be performed by a liquid crystal panel in order to set and control the Gch color light amount, both the theater type and the presentation type are used depending on one type of liquid crystal projector model. Even if it can be made compatible, it will result in sacrificing the display gradation, so in practice, this method can not be adopted, and two models are separately manufactured according to each application The fact is that we are going to do it.

[0006] For the user of the liquid crystal projector device, a separate liquid crystal projector device is provided for each application, which not only increases the investment cost but also deteriorates the usability in terms of utilization efficiency. And
For the manufacturer, a production line for a separate liquid crystal projector device and adjustment work are required, which results in an increase in the production cost.

The present invention has been made in view of the above circumstances, and has been developed by changing the specifications of liquid crystal projector devices of different models and optical components, etc., which can respond to the above-mentioned theater specifications and presentation specifications. It is not possible to realize this with only one kind of liquid crystal projector device model, and the light amount of each color light is, in particular, Gch (Gr).
een Channel (green light channel)
It is an object of the present invention to provide a light quantity control means that can be controlled continuously by simple means.

[0008]

The liquid crystal projector device according to the present invention does not change the model of the liquid crystal projector device for each application and does not change the specifications of the optical parts, and thus, one type of model. Alone, it is possible to continuously control the light quantity of each color light, especially Gch, and according to the application, by controlling the light quantity of each color light, especially Gch, it is also possible to use a theater type. It can be easily applied to a presentation type.

That is, specific technical means of the liquid crystal projector according to the present invention are as follows.

The first technical means is to separate the illumination light emitted from the lamp light source into each of red, green and blue light through a dichroic mirror, and then to separate the light into each of the color lights. In a liquid crystal projector device, the light is condensed on each liquid crystal panel surface, modulated by video information of each color, and further, through a dichroic prism and a projection lens, the modulated respective color lights are combined and projected. A square mesh wire cloth made of a wire for forming a plurality of rectangular openings arranged in a mesh on the optical path of one of the color lights or a plurality of the color lights, The shape of the opening is reversibly changed depending on whether or not an external force is applied to the opening, and the shape of the opening is changed according to the magnitude of the applied external force. Continuously each shape, is characterized in that the liquid crystal projector device having an opening shape deformation means capable of elastic deformation.

According to a second technical means, in the liquid crystal projector device according to the first technical means, the opening shape deforming means reversibly and continuously elastically deforms each shape of the opening. The liquid crystal projector device may further include, as the external force applying unit, a unit that applies a tension that pulls the diagonal direction of the rectangular opening.

A third technical means is the liquid crystal projector according to the first technical means, wherein the opening shape deforming means reversibly and continuously elastically deforms each shape of the opening. The liquid crystal projector device may include a means for applying a pressure for inclining a side surface of the square mesh wire cloth as the means for applying the external force.

A fourth technical means is the liquid crystal projector device according to any one of the first to third technical means, wherein an aperture ratio of the opening elastically deformed by the opening shape deforming means is equal to the external force. About 10% depending on whether or not voltage is applied
The liquid crystal projector device is controlled to the magnitude of the external force accompanied by the change of the external force.

According to a fifth technical means, in the liquid crystal projector device according to any one of the first to fourth technical means, the square mesh wire cloth is placed only on the optical path of the green light which is color-separated. A liquid crystal projector device to be arranged is characterized.

A sixth technical means is the liquid crystal projector according to any one of the first to fifth technical means,
As an arrangement position of the square mesh wire cloth,
The distance from the square mesh wire cloth to the liquid crystal panel is F, the F value of the illumination optical system is F, the diagonal line length of the liquid crystal panel is M, and the wire diameter of the wire forming the square mesh wire cloth is D. When you do, $ M /
The liquid crystal projector is arranged at a position having a value larger than (F × D)｝.

A seventh technical means is the liquid crystal projector according to any one of the first to sixth technical means,
The liquid crystal projector device is characterized in that the square mesh wire cloth is a plain weave square mesh wire cloth made of plain weave in which vertical and horizontal wires alternately intersect.

By using a liquid crystal projector device having any of the above technical means, it becomes possible to control the light amount of each color light separated in color continuously and reversibly. The corresponding optimum color temperature of the video specification can be realized by the liquid crystal projector device of only one type.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a liquid crystal projector according to the present invention will be described below with reference to the drawings. First, FIG. 1 is a configuration diagram illustrating an example of an optical path of an optical system in a liquid crystal projector device according to the present invention. Illumination light (divergent light) from the light source lamp 1 is guided toward the fly-eye lenses 3 and 4 by a reflector (for example, a parabolic reflector) 2. The illumination light passes through a pair of fly-eye lenses 3 and 4 and is reflected by a reflection mirror 5.
Is incident on. The incident illumination light is reflected by the reflection mirror 5, changed its direction, and is incident on the condenser lens (condensing lens) 6.

Further, in the dichroic mirror (color separation / reflection mirror) 7, of the illumination light condensed by the condenser lens 6, the G / B illumination light 101 composed of Gch color light and Bch color light is reflected, while Rch is used. The R illumination light 102 composed of color light is transmitted and separated into two color lights. Furthermore, the GB illumination light 101
Is incident on a dichroic mirror (color separation / reflection mirror) 8, where the Gc of the GB illumination light 101 is Gc
The G illumination light 103 composed of the h-color light is reflected, and the B illumination light 104 composed of the Bch-color light is transmitted, so that the light is further separated into two color lights.

The G illumination light 103 composed of the Gch color light reflected by the dichroic mirror (color separation / reflection mirror) 8 is a square mesh wire cloth composed of wires forming a plurality of rectangular openings arranged in a mesh. According to 11, the amount of transmitted light is controlled to an appropriate size according to the application, and is incident on a condenser lens (condensing lens) 12, and is transmitted onto a liquid crystal panel surface 19 which is a light valve for converting a green light image signal. It is collected. Here, the shape of the opening of the square mesh wire cloth 11, which determines the amount of transmitted light of the square mesh wire cloth 11, is reversibly and continuously elastically deformed by the opening shape deforming means 11a. The magnitude of the transmitted light quantity is continuously adjusted and controlled to an appropriate magnitude according to the application. The above-mentioned application is, for example, a case where the liquid crystal projector is used as a presentation specification or a theater specification.

On the other hand, the R illumination light 1 composed of the Rch color light transmitted through the dichroic mirror (color separation / reflection mirror) 7
Numeral 02 is reflected by the reflection mirror 14, is incident on the condenser lens (condensing lens) 15, and is condensed on the liquid crystal panel surface 18, which is a light valve for converting a video signal of red light.

The B illumination light 1 composed of Bch color light transmitted through the dichroic mirror (color separation / reflection mirror) 8
Reference numeral 04 denotes a liquid crystal panel surface 20 which is incident on a condenser lens (condensing lens) 17 via reflection mirrors 10 and 16 and condenser lenses (relay lenses) 9 and 13 and is a light valve for converting a blue light image signal. Focused on top.

The R illumination light 102, the G illumination light 103, and the B illumination light 104, which are respectively condensed on the liquid crystal panel surfaces 18, 19, and 20, respectively, emit the respective color lights.
At 20, after being modulated by the video signal of each color light, a dichroic prism (color combining prism) 2
1 and are enlarged and projected through the projection lens 22.

In FIG. 1, a square mesh wire cloth 11 for controlling the transmitted light amount of each color light is connected to Gc
Although the case where it is arranged only on the optical path of the G illumination light 103 composed of h-color light is shown, it is not limited to such a case.
Depending on the application, it may be arranged on the optical path of another color light, or may be arranged not only on the optical path of one color light but also on the optical path of a plurality of color lights.

As shown in FIG. 1, the G light of Gch
FIGS. 2 and 3 show an example of the structure of the square mesh wire cloth 11 arranged on the optical path of the G illumination light in order to control the amount of transmitted illumination light 103.
Here, FIG. 2 is a plan view showing an example of the structure of the square mesh wire cloth 11 in a state where no external force (for example, tension) is applied, and FIG. It is a top view which shows an example of the structure when the shape of the mesh wire cloth 11 is deformed.

That is, as shown in FIG. 2, the square mesh wire cloth 11 is formed by making the vertical and horizontal wires orthogonal to each other so as to form a plurality of rectangular openings arranged in a mesh. As an external force applied to the square mesh wire cloth 11 applied by the opening shape deforming means 11a, for example, a tension pulling in a diagonal direction of the square opening is applied. When the voltage is applied, the structure of the opening can be changed into a parallelogram shape which is continuously distorted in the direction of the tension (ie, diagonal direction) according to the magnitude of the tension. ing.

The deformation of the shape of the opening is an elastic deformation in which the presence or absence of the deformation changes reversibly in accordance with the presence or absence of the application of an external force. Can restore a distorted parallelogram shape to its original square shape. Therefore, if the knitting method of the wire for forming the square mesh wire cloth 11 is a plain weave in which the vertical and horizontal wires are alternately interlaced and woven, such deformation / restoration operation can be easily performed. The elastic deformation can be applied to the square mesh wire cloth 11.

When the tension is applied as an external force in the diagonal direction of the opening of the square mesh wire cloth 11 by the opening shape deforming means 11a (for example, a movable lever), the shape of the opening changes from a square shape. The square mesh wire cloth is deformed into a parallelogram shape, and the aperture ratio changes. By appropriately controlling the magnitude of an external force (for example, tension) by the opening shape deforming means 11a (for example, a movable lever), the square mesh wire cloth is formed. 11 can be controlled to a desired value.

For example, as an example of this embodiment, the square mesh wire cloth 11 shown in FIG. 2 in a state where no external force (for example, tension) is applied has a rectangular opening, but has a wire diameter of 0.1 mm. 2 mm, opening 1
At 39, the aperture ratio is 76.4%.

On the other hand, as shown in FIG. 3, the opening ratio of the square mesh wire cloth 11 when the opening shape deforming means 11a applies tension in the diagonal direction of the rectangular opening as the external force is, for example, deformed. When one diagonal of the parallelogram (that is, the mesh tilt angle) of the opening is changed from 90 degrees to 60 degrees, the change is about 10% as compared with the case of the original square opening. , Which is 90% of the original aperture ratio, which is 68.8%. Thus, the amount of transmitted color light (for example, G illumination light 103 composed of Gch color light) transmitted through the square mesh wire cloth 11 is also reduced to 90% as compared with the case before the tension is applied. The degree can be changed.

Here, the square mesh wire cloth 1
The relationship between the mesh tilt angle of 1 (the one diagonal of the parallelogram) and the amount of transmitted color light (for example, G illumination light composed of Gch color light) transmitted through the square mesh wire cloth 11 is shown in FIG. It becomes as shown in the graph. That is, when the magnitude of the external force (for example, tension) is appropriately controlled to change the mesh tilt angle, the amount of transmitted color light (for example, G illumination light 103 composed of Gch color light) is Decreases in proportion to the degree of increasing the size of the mesh, that is, in proportion to the degree to which the mesh inclination angle decreases.

Therefore, the square mesh wire cloth 1
1 is disposed on the optical path of the G illumination light 103 composed of Gch color light to control the amount of transmitted light, and when the mesh tilt angle is 90 degrees (that is, the state where the opening is square without application of external force) ), The respective values of the X coordinate and the Y coordinate of the chromaticity coordinate axis are x = 0.300 and y =
When set to 0.345, the mesh tilt angle is set to 60
Degrees (that is, when the tension appropriately controlled as an external force is applied and the opening is deformed to be a parallelogram) and the X coordinate and the Y coordinate of the chromaticity coordinate axis.
Let x = 0.300, y = 0.33 for each value of the coordinates
The setting can be controlled to 0.

Then, the square mesh wire cloth 11 is formed by using an appropriate opening shape deforming means 11a (for example, a movable lever) of the square mesh wire cloth 11.
The magnitude of the external force applied to the square mesh wire cloth 11 is controlled to change the shape of the opening of the square mesh wire cloth 11 as described above.
If the mesh inclination angle can be reversibly changed between 90 degrees and 60 degrees so that the aperture ratio of each opening can be changed by about 10%, one type of liquid crystal projector device can be used. Accordingly, it can be selectively used for presentation specifications and theater specifications. That is, when providing a liquid crystal projector device of a presentation specification that requires a light amount, control is performed without external force. On the other hand, when providing a theater-type liquid crystal projector that matches the color temperature with that of a conventional cathode ray tube at the expense of the amount of light, Gc
The mesh inclination angle of the square mesh wire cloth 11 arranged on the optical path of the G illumination light 103 composed of h-color light is 9
Control is performed so that an external force such as changing the opening ratio of the opening by about 10% is applied in the diagonal direction of the mesh opening as a tension, for example, by inclining from 0 degree to 60 degrees. As described above, if such a liquid crystal projector device composed of only one type of model is prepared, it is possible to provide a liquid crystal projector device applicable to both purposes.

As the opening shape deforming means 11a for the square mesh wire cloth 11 shown in FIG. 2, the magnitude of the external force generated is an appropriate value (ie, for example, the magnitude of the external force at which the aperture ratio changes by about 10%). By using a movable lever set in the above manner, a tension is applied by a brace connected to the movable lever to diagonally pull the rectangular opening of the square mesh wire cloth 11, as shown in FIG. , An opening having a parallelogram shape forming a diagonal of 60 degrees. However, the opening shape deforming means 11a is not limited to the case where the tension is applied and deformed. For example, the pressure for inclining the side surface of the square mesh wire cloth 11 by the arm connected to the movable lever is used. By applying the voltage, the shape of the opening may be changed to a parallelogram shape. The opening shape deforming means 11a may be the movable lever capable of appropriately adjusting the magnitude of the external force, or may be deformed to a size corresponding to a predetermined opening ratio of the opening. It may be constituted by a plurality of buttons adjusted so that the magnitude of the external force that can be applied can be applied.

In the square mesh wire cloth 11 illustrated in FIGS. 2 and 3, the wires arranged vertically and horizontally are orthogonal to each other so as to form a rectangular opening as the structure of the mesh wire cloth. It is a square positional relationship, but is not limited to such a case, and in the state where no external force is applied, the shape of the opening may be a shape such as a rhombus or a parallelogram, or a circular shape. Even if the shape is the same, the opening ratio of the opening can be changed by a predetermined amount (for example, a change amount of about 10%) by applying a controlled external force. The mesh wire cloth may have any shape as long as it has a shape.

Such a square mesh wire cloth 11
Is disposed on the optical path of the G illumination light 103 composed of, for example, Gch color light, and is pulled by a movable lever, for example, in a diagonal direction of a square, which is the shape of the opening of the square mesh wire cloth 11, depending on the application. By controlling the magnitude of the tension, the amount of transmitted Gch color light can be controlled, and the chromaticity of 100% white can be changed appropriately. Therefore, by controlling the amount of Gch color light, the color temperature can be controlled, and one type of model can be used for both the theater specification and the presentation specification.

The square mesh wire cloth 11
Is arranged so that the following relationship is satisfied. That is, as shown in FIG.
For example, when the distance between the liquid crystal panel 19 and the square mesh wire cloth 11 is L, the wire diameter of the square mesh wire cloth 11 is D, the F value of the illumination optical system is F, and Assuming that the length of the diagonal line is M, it is desirable that the value of L satisfy the relational expression of L> M / (D × F). If the distance between the liquid crystal panel 19 and the square mesh wire cloth 11 is not within the range of L, that is, if the position of the square mesh wire cloth 11 is too close to the focus position of the illumination optical system, the liquid crystal On the panel 19, the shadow of the mesh wire of the square mesh wire cloth 11 may cause illuminance unevenness, which may result in the adverse effect that the shadow of the mesh wire is reflected in the projected image. Therefore, the distance between the liquid crystal panel 19 and the square mesh wire cloth 11 is arranged so as to be within the range of L shown in the above equation, and the distance is smaller than the focus plane obtained from the depth of focus of a general illumination optical system. , It is desirable to be arranged at positions spaced apart.

As means for controlling the amount of light, it is possible to use an aperture provided in a camera or the like instead of using means for deforming the shape of the square mesh wire cloth opening according to the present invention. However, when such an aperture is used, unevenness occurs in the in-plane illuminance of the liquid crystal panel, so that there is a restriction that the aperture can be arranged only at a specific position, which is not preferable.

[0039]

If the illumination optical system employed in the liquid crystal projector device according to the present invention described above is applied, the amount of each color light of the color-separated illumination light (for example, green light) Gch (Green Channel)
l) The amount of color light) is continuously controlled to an appropriate value according to the application, so that the optimal color temperature of the video specification according to the application is realized by one type of liquid crystal projector device. For example, it is possible to realize a liquid crystal projector that can flexibly cope with presentation specifications and theater specifications. Thus, not only a user of the liquid crystal projector device but also a manufacturer can provide a liquid crystal projector device that produces great merits.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of an optical path of an optical system in a liquid crystal projector device according to the present invention.

FIG. 2 is a plan view showing an example of a structure of a square mesh wire cloth in a state where no external force (for example, tension) is applied.

FIG. 3 is a plan view showing an example of a structure of a square mesh wire cloth in a state where tension is applied as an external force.

FIG. 4 shows a mesh inclination angle of a square mesh wire cloth and G passing through the square mesh wire cloth.
It is a graph which shows the relationship with the transmitted light quantity of G illumination light which consists of ch color light.

FIG. 5 is a configuration diagram showing an optical path of an optical system of a conventional liquid crystal projector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Light source lamp, 2 ... Reflector, 3 ... Fly-eye lens, 4 ... Fly-eye lens, 5 ... Reflection mirror, 6 ... Condenser lens (condensing lens), 7 ... Dichroic mirror, 8 ... Dichroic mirror, 9 ... Condenser lens (Relay lens), 10: reflection mirror, 11: square mesh wire cloth, 11a: aperture shape deforming means, 1
2 ... condenser lens (condensing lens), 13 ... condenser lens (relay lens), 14 ... reflection mirror, 15 ...
Condenser lens (condensing lens), 16: Reflecting mirror, 17: Condenser lens (condensing lens), 18, 1
9, 20: liquid crystal panel, 21: dichroic prism (color combining prism), 22: projection lens, 101: G
B illumination light, 102 ... R illumination light, 103 ... G illumination light, 10
4: B illumination light.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/74 H04N 5/74 A 9/31 9/31 CF term (Reference) 2H088 EA14 EA15 HA10 HA13 HA24 HA28 MA05 2H091 FA05X FA05Z FA26X FA41Z FA50Z FD06 LA30 MA07 5C058 BA35 EA11 EA26 EA51 5C060 BA04 BA09 BC05 GA02 HC15 HC25 HD02 JA18 JB06

Claims (7)

[Claims] An illumination light emitted from a lamp light source is separated into red light, green light and blue light through a dichroic mirror, and then separated on a liquid crystal panel surface for each of the color lights. In the liquid crystal projector device which converges, modulates with the image information of each color, further synthesizes each of the modulated color lights through the dichroic prism and the projection lens, and performs projection, Alternatively, on the optical path of the plurality of color lights, a square mesh wire cloth made of a wire forming a plurality of rectangular openings arranged in a mesh is arranged, and an external force is applied to the square mesh wire cloth. Depending on the presence or absence, each shape of the opening reversibly,
In addition, the liquid crystal projector device includes an opening shape deforming unit that can continuously and elastically deform each shape of the opening according to the magnitude of the external force to be applied. 2. The liquid crystal projector device according to claim 1, wherein the opening shape deforming means is configured as the external force applying means for reversibly and continuously elastically deforming each shape of the opening. A liquid crystal projector device comprising means for applying a tension for pulling a rectangular opening in a diagonal direction. 3. The liquid crystal projector device according to claim 1, wherein the opening shape deforming means is configured as the external force applying means for reversibly and continuously elastically deforming each shape of the opening. A liquid crystal projector device having means for applying a pressure for inclining a side portion of a square mesh wire cloth. 4. The liquid crystal projector device according to claim 1, wherein an opening ratio of the opening portion elastically deformed by the opening shape deforming means is about 10% depending on whether or not the external force is applied. A liquid crystal projector device wherein the magnitude of the external force accompanying the change is controlled. 5. The liquid crystal projector device according to claim 1, wherein the square mesh wire cloth is provided only on an optical path of the green light that is color-separated.
A liquid crystal projector device characterized by being arranged. 6. The liquid crystal projector device according to claim 1, wherein an interval between the square mesh wire cloth and the liquid crystal panel is set as an arrangement position of the square mesh wire cloth. F value is F, diagonal line length of the liquid crystal panel is M,
A liquid crystal projector device, wherein, when a wire diameter of a wire forming the square mesh wire cloth is D, the wire is arranged at a position larger than {M / (F × D)}. 7. The liquid crystal projector device according to claim 1, wherein the square mesh wire cloth is a plain weave square mesh wire cloth made of a plain weave in which vertical and horizontal wires alternately intersect. Characteristic liquid crystal projector device.