JP2001264697A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the use efficiency of light beams from light source lamps and, at the same time, to improve quality in a projection image by permitting the light beams from the two light source lamps to coincide in light axis and to be superimposed. SOLUTION: The light beams from the light source lamp 1 are converged in an integrator lens 2, aligned with p-polarization light beams by a PBS array 3 and made to pass through a PBS 4. The light beams from the light source lamp 5 are converged in an integrator lens 6, aligned to s-polarization light beams by a PBS array 7 and reflected by the PBS 4. The p and s-polarization light beams from the PBS 4 are converged in an integrator lens 8, aligned with the p or s-polarization light beams by a PBS array 9 and made incident on a succeeding stage optical system 10. The light source lamp 5, the integrator lens 6 and the PBS array 7 are arranged to permit the light axis of the light beams from the light source lamp 5, which are reflected by the PBS 4, to coincide with the light axis of the light beams from the light source lamp 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device, and more particularly to an optical mechanism for superposing optical axes of light beams from two light source lamps.

[0002]

2. Description of the Related Art When two light source lamps are used to increase the brightness of a projector device, for example, as shown in FIG.
To reflect in the same direction (upward in the figure), and the subsequent optical system, that is, a dichroic mirror in the case of a liquid crystal projector,
Alternatively, a light reflection element (for example, a DMD (Digital Micro Processing)
(mirror Device) = Texas Instruments, USA), but the paths of the optical axis A of the light beam from the lamp 31 reflected by the triangular mirror 33 and the optical axis B of the light beam from the lamp 32 are different. There is a difference in the incident angle to the optical system in the subsequent stage between the light beam of the optical axis a and the light beam of the optical axis b, so for example, if the light from one of the lamps is set to enter at the optimum incident angle The angle of incidence of the light beam from the other lamp is no longer at the optimum value. As a result, not only does the efficiency of use of the light beam decrease, but also the accuracy of color separation decreases in the color separation optical system, and there is a difference in the reflection direction in the light reflection element. For example, the image quality may deteriorate.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to superimpose light beams from two light source lamps so that their optical axes coincide with each other, to increase the efficiency of use of light beams from the light source lamps, and at the same time to improve the quality of a projected image. With the goal.

[0004]

In order to achieve the above object, in a projector apparatus according to the present invention, a first light source lamp and a light beam from the first light source lamp are incident via a first integrator lens, and are provided with a predetermined polarization. A first PBS (polarizing beam splitter) array for aligning and emitting the first polarized light beam on the surface, a second light source lamp, and light beams from the second light source lamp through a second integrator lens, and the first polarized light beam A second PBS array that emits light aligned with the second polarized light beam having a polarization plane different by 90 °, and a PBS that transmits the first polarized light beam from the first PBS array and reflects the second polarized light beam from the second PBS array; The second light source lamp, the second integrator lens, and the second PB such that the optical axis of the second polarized light beam reflected by the PBS matches the optical axis of the first polarized light beam transmitted through the PBS. The S-array is arranged, and the first and second polarized light beams from the PBS are incident on the subsequent optical system, where the light is modulated and projected on the screen.

The first PBS array transmits the first polarized light beam incident through the first integrator lens, and converts the incident second polarized light beam into a light beam having the same polarization plane as the first polarized light beam. The second PB
The S array transmits the second polarized light beam incident through the second integrator lens, converts the incident first polarized light beam into a light beam having the same polarization plane as the second polarized light beam, and emits the same. .

[0006] Then, a third stage optical system is used in which a first polarized light beam and a second polarized light beam from the PBS enter through a third integrator lens and exit with a uniform polarization plane.
An S array, a color separation unit for separating the light beam from the third PBS into red, green and blue light beams, and three liquid crystal panels for red, green and blue with the red, green and blue light beams from the color separation unit A liquid crystal panel that emits red, green, and blue image light rays based on an image signal and emits red, green, and blue image light rays; a color synthesis section that synthesizes red, green, and blue image light rays from the liquid crystal panel section; And a projection unit for projecting the image light beam from the combining unit onto the screen.

In this case, the third PBS array transmits the first polarized light beam from the PBS and transmits the second polarized light beam to the first PBS array.
A liquid crystal panel that converts the light into a light beam having the same polarization plane as the polarized light beam and emits the same light beam is used, and the three liquid crystal panels are of a type that modulates the first polarized light beam. And a liquid crystal panel that converts the first polarized light beam into a light beam having the same polarization plane as the second polarized light beam and emits the same, and the three liquid crystal panels modulate the second polarized light beam. To use

Alternatively, the optical system at the subsequent stage includes a color separation unit for separating the first and second polarized light beams from the PBS into red, green and blue light beams, and a red, green and blue light beam from the color separation unit. A light reflecting element section that irradiates a mirror element of each pixel for red, green and blue with a light beam, rotates the mirror element for each pixel based on a video signal, and reflects an incident light beam in a predetermined direction, and a light reflecting element section And a projection unit for projecting the image light rays from the color synthesis unit onto a screen.

The first polarized light beam is, for example, a p-polarized light component, and the second polarized light beam is an s-polarized light component.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a configuration diagram of a main part of an embodiment of a projector device according to the present invention, in which 1 is a first light source lamp, 2 is a first integrator lens, and 3 is a first P lamp.
BS array, 4 is PBS, 5 is 2nd light source lamp, 6 is 2nd integrator lens, 7 is 2nd PBS array, 8 is 3rd integrator lens, 9 is 3rd PBS array, 10
Is an optical system including a color separation unit, an LCD (liquid crystal panel) unit, a color synthesis unit, and a projection unit.

The white light beam from the first light source lamp 1 is condensed by the first integrator lens 2 and the first PBS array 3
Incident on. The first PBS array 3 is, for example, as shown in FIG.
A light beam from the first integrator lens 2 is incident on portions a and b of the incident surface, a first polarized light beam (p-polarized light component) is transmitted through the PBS surface 11, and a second polarized light beam is formed as shown in FIG. The light beam (s-polarized component) is reflected by the PBS surfaces 11 and 12, and
The light enters the half plate 13, rotates the plane of polarization by 90 °, is converted into the first polarized light, and is emitted. These first polarized light pass through the PBS 4. On the other hand, a white light beam from the second light source lamp 5 is collected by the second integrator lens 6 and enters the second PBS array 7. The second PBS array 7 is, for example, as shown in FIG.
The light from the second integrator lens 6 is incident on the portions c to d of the incident surface, the first polarized light (p-polarized light component) is transmitted through the PBS surface 14, and λ / 2 Board 13
Rotates the polarization plane by 90 °, and is emitted as a second polarized light beam (s-polarized light component). The second polarized light beam from the second integrator lens 6 is reflected by the PBS surfaces 14 and 15 and emitted.
Reflected by PBS4. At this time, the second light source lamp 5, the second integrator lens 6, and the second integrator lens 6 are arranged such that the optical axis of the light beam from the first light source lamp 5 reflected by the PBS 4 matches the optical axis of the light beam from the first light source lamp 1. 2PBS array 7 is arranged.

In the case of a liquid crystal type projector device, as shown in FIG. 1, first and second polarized light beams from the PBS 4 are condensed by a third integrator lens 8, and a third PBS array 9 aligns the polarization planes thereof. A polarized light beam or a second polarized light beam;
The light enters the color separation unit (constituted by a dichroic mirror or the like) of the optical system 10 at the subsequent stage, separates the light into red, green, and blue light rays, and
The three liquid crystal panels for red, green, and blue in the D part are illuminated, light is modulated based on the video signal, and the emitted red, green, and blue video rays are combined by a color combining unit (configured with a dichroic prism, etc.). Then, the image is enlarged and projected on the screen by the projection lens of the projection unit. When the p-polarized light type is used for the liquid crystal panel, the same third PBS array 9 as the first PBS array 3 is used. When the liquid crystal panel is the s-polarized light type, the third PBS array 9 is used.
The same BS array 9 as the second PBS array 7 is used.

In the case of a DLP type projector device, as shown in FIG. 3, a first polarized light beam (p-polarized light component) transmitted through the PBS 4 and a second polarized light beam (s-polarized light component) reflected by the PBS 4 are used. Together, they are incident on a color separation section (composed of a dichroic mirror, etc.) of the optical system 21 and are separated into red, green and blue light rays, and are reflected by red, green and blue light rays from the color separation section to form a light reflection element (DMD). Irradiates the mirror element for each pixel of red, green and blue, rotates the mirror element of the pixel based on the video signal, reflects the incident light in a predetermined direction, and reflects the reflected three-color image light. The images are synthesized by the color synthesis unit, and are enlarged and projected on the screen by the projection lens of the projection unit.

As described above, since the first polarized light transmitted through the PBS 4 and the second polarized light reflected by the PBS 4 have the same optical axis, the light emitted from the third PBS 9 in the case of FIG. Since both the light from the first light source lamp 1 and the light from the second light source lamp 5 enter the color separation unit at the same incident angle, the two light source lamps can be set by appropriately setting the incident angle to the color separation unit. Can be color-separated in an optimal state, good color separation performance can be obtained, and the efficiency of light source light beam utilization can be increased. Also,
In the case of the example of FIG. 3, since the light beams from the two light source lamps are incident on the light reflecting element portion at the same incident angle, the reflection directions of the two light beams match, so that the projected image has clearness (resolution). It is high and has high brightness.

[0015]

As described above, according to the projector device of the present invention, the light beams from the two light source lamps are overlapped with their optical axes coincident with each other. Since the incident angles of the light beams from the two light source lamps are the same, the color separation performance can be set to both the optimum values. In the DLP projector, the incident light beams from the two light source lamps to the light reflecting element are reflected because they are the same. This makes it possible to increase the clarity (resolution) of the projected image without causing a difference in the direction of the projected image, thereby improving the quality of the projected image and increasing the utilization rate of the light source beam.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an embodiment of a projector device according to the present invention.

FIG. 2 is a detailed view of a main part of a first PBS array and a second PBS array.

FIG. 3 is a main part configuration diagram of another embodiment of the projector device according to the present invention.

FIG. 4 is a diagram illustrating an example of a light source unit of a conventional projector device.

[Explanation of symbols]

 1, 5 First and second light source lamps 2, 6, 8 First, second, third integrator lenses 3, 7, 9 First, second, third PBS arrays 4 PBS 10, 21 Optical systems 11, 12, 14, 15 PBS surface 13 λ / 2 plate 31, 32 lamp 33 Triangular mirror

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G09F 9/00 360 H04N 5/74 A H04N 5/74 G02F 1/1335 530 F term (reference) 2H088 EA14 EA15 HA20 HA21 HA24 2H091 FA10Z FA14Y FA26X FA26Z FA41Z FD03 LA03 LA16 MA07 2H099 AA12 BA09 CA02 CA08 DA05 5C058 AA06 BA25 EA02 EA11 EA12 EA13 EA21 EA51 5G435 AA02 AA03 AA04 BB11 GG12 GG15 GG12 BB15 BB12 BB15 BB16 BB12

Claims (7)

[Claims] 1. A first light source lamp, and a first PBS that receives light from the first light source lamp via a first integrator lens, aligns the light with a first polarized light having a predetermined polarization plane, and emits the light.
(Polarizing beam splitter) An array, a second light source lamp, and a light beam from the second light source lamp are incident through a second integrator lens and aligned with a second polarized light beam having a polarization plane different from the first polarized light beam by 90 °. A second PBS array for transmitting the first polarized light beam from the first PBS array and reflecting the second polarized light beam from the second PBS array, and a second polarized light beam reflected by the PBS. The second light source lamp, the second integrator lens, and the second PBS array are arranged so that the axes coincide with the optical axis of the first polarized light beam transmitted through the PBS, and the first polarized light beam and the second polarized light beam from the PBS are arranged in the subsequent stage. A projector device which is incident on the optical system, modulates the light, and projects the light on a screen. 2. The first PBS array transmits a first polarized light beam incident through a first integrator lens and converts the incident second polarized light beam into a light beam having the same polarization plane as the first polarized light beam. The second PBS array transmits the second polarized light beam incident through the second integrator lens, and converts the incident first polarized light beam into the same polarization plane as the second polarized light beam. 2. The projector device according to claim 1, wherein the light is converted into a light beam and emitted. 3. The third optical system receives a first polarized light beam and a second polarized light beam from the PBS via a third integrator lens, and outputs the first polarized light beam and the second polarized light beam with their polarization planes aligned.
A BS array, a color separation unit that separates light beams from the third PBS array into red, green, and blue light beams, and three liquid crystals for red, green, and blue with red, green, and blue light beams from the color separation unit A liquid crystal panel unit that irradiates a panel, modulates light based on a video signal, and emits red, green, and blue video rays, and a color synthesis unit that combines red, green, and blue video rays from the liquid crystal panel, 2. The projector device according to claim 1, further comprising: a projection unit configured to project an image light beam from the color synthesis unit onto a screen. 4. The third PBS array transmits the first polarized light from the PBS and transmits the second polarized light to the first PBS.
4. The projector device according to claim 3, wherein a device that converts and emits a light beam having the same polarization plane as the polarized light beam is used, and the three liquid crystal panels use a type that modulates the first polarized light beam. 5. The third PBS array transmits the second polarized light from the PBS and transmits the first polarized light to the second PBS.
4. The projector device according to claim 3, wherein a device that converts and emits a light beam having the same polarization plane as the polarized light beam is used, and the three liquid crystal panels use a type that modulates a second polarized light beam. 6. The post-stage optical system includes: a color separation unit that separates the first and second polarized light beams from the PBS into red, green, and blue light beams; and a red, green, and blue light beam from the color separation unit. A blue light beam illuminates a mirror element of each pixel for red, green, and blue, and a mirror element is rotated for each pixel based on a video signal to reflect an incident light beam in a predetermined direction, and a light reflection element. 2. The projector device according to claim 1, further comprising: a color synthesizing unit for synthesizing the image light beams of the three colors reflected by the element unit; and a projection unit for projecting the image light beams from the color synthesizing unit onto a screen. 7. The first polarized light beam is a p-polarized light component,
The projector according to claim 1, wherein the second polarized light beam is an s-polarized light component.