JP2001296608A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a display device silent. SOLUTION: The display device has a display optical system part, provided with a light source system having a light source, an illumination system for irradiating a display element with light from the light source, the display element for controlling and emitting the irradiated light and a projection system for projecting light from the display element, and is provided with an optical system for separating and emitting a desired color from incident light by using a color disk in the illumination system. In this display device, a structure is provided on a surface facing the color disk of a motor holder holding the color disk, to make the display device silent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device and the like for irradiating a display element with light from a light source and projecting the light from the display element onto a screen.

[0002]

2. Description of the Related Art Heretofore, a projection type display device is more advantageous than a display device using a cathode ray tube in that a depth of a large screen can be reduced. For example, as this kind of apparatus,
-319501, or JP-A-10-97000
There is a display device described in Japanese Unexamined Patent Publication (Kokai) No. H10-26095.

[0003] That is, a projection type display device is an optical unit that projects light controlled by light from a light source into a display element and that is controlled in accordance with input data, a reflection mirror, a screen, and a housing that supports these. The light projected from the optical unit is projected from a back surface onto a screen via a reflection mirror, and image data or the like is projected on the front surface. In particular, JP-A-10-3
In Japanese Patent Laid-Open No. 19501, two reflecting mirrors are provided to enable the position of a projected image on a screen to be adjusted.

On the other hand, the optical unit includes a light source, an illumination system for irradiating the display element with light from the light source, a display element, and a projection system for projecting light from the display element.

As an illumination system, there is a method of separating colors by time division. As this type of apparatus, for example, Japanese Patent Application Laid-Open No. H10-4
There is a display device described in Japanese Patent No. 8542. In this proposal, a color disk to which a color filter segment for separating a desired color is fixed, and a motor for rotating and driving, a color disk unit having a color disk fixed to the motor, light from a light source, Light is incident on a color disk rotated by a motor, and light separated in a time-division manner is applied to the display element.

[0006]

SUMMARY OF THE INVENTION There is a demand for a projection-type display device to be quiet. In the case of a television application, noise is conspicuous in a quiet scene, so further severe noise reduction is required.

The illumination system includes a color disk having a color filter fixed thereon for separating a desired color and a motor for rotating and driving, and a color disk unit having the color disk fixed to the motor. In the case of using an optical system for irradiating a display element with light separated by time division on a color disk rotated by a motor, the rotation speed of the color disk is, for example, 720.
The speed is as high as 0 min-1, and mechanical noise of the motor, wind noise and the like are generated, and the noise level increases.

However, in the above-described conventional example, no consideration is given to noise, and there is a possibility that loud noise is generated.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a quiet display device.

[0010]

To achieve the above object,
According to the present invention, a color disk on which a color filter for separating a desired color is fixed, and a motor for rotating and driving the color disk, the color disk is fixed to the motor. And a composition for suppressing noise due to the rotation of the color disk.

A cover is provided for engaging the motor holder to cover the color disk, and a structure for suppressing noise caused by rotation of the color disk is provided on the surface of the cover facing the color disk.

The structure is a wall for rectifying the flow of air generated by the rotation of the color disk, so that the space in which the air flows is reduced and the noise inside is reduced, thereby reducing the noise of the display device.

[0013] Further, the structure is made of a plurality of projections, and the vortex existing in the air flow is reduced to reduce the noise of the display device.

Further, the structure is arranged such that a plurality of wall surfaces are arranged concentrically with the color disk to rectify the flow of air and reduce the noise of the display device.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1 to 6 are general views of a display device for explaining the present invention.

FIG. 1 is a front view of the display device 20, FIG. 3 is a top view of the display device 20, and FIG. 5 is a side view of the display device 20, showing an overview of the entire device. In the figure, reference numeral 1 denotes a housing, and 2 denotes a screen. A major feature of the display device 20 according to the present invention is that the dimension below the screen 2 is very small. The portion of the housing 1 outside the screen 2 is very thin, and the size of the display device 20 is
Is determined by the size of Further, as shown in FIG. 3, the display device 20 has a shape that is greatly narrowed down in the depth direction, which is convenient for installation at a corner or the like.

FIG. 2 is a front view of the display device 20, FIG. 4 is a top view of the display device 20, and FIG. 6 is a side view of the display device 20. In particular, reference numeral 4 denotes a reflection mirror. An optical path reaching the screen 2 via the mirror 4 is indicated by a broken arrow. The reflection mirror 4 is disposed obliquely on the upper side in the depth direction of the housing 1 at a position rearward of substantially half and at the top.
A predetermined projection optical path indicated by a dashed arrow in FIGS. 2 and 6 is obtained.
As described above, since the reflection mirror 4 is disposed substantially halfway in the depth direction, the display optical unit can also be disposed relatively rearward. Further, as shown in FIG. 6, since the projection system from the display optical unit to the reflection mirror 4 and the reflection system from the reflection mirror 4 to the screen 2 have substantially the same space, the display optical unit can be moved rearward and relatively. At the top. Therefore, the display device 20 can be downsized.

FIG. 7 is a front view of the display device 20, FIG. 8 is a top view of the display device 20, and FIG. 9 is a side view of the display device 20. 3 is illustrated. The light projected from below by the display optical unit 3 is turned in a substantially horizontal direction by a reflection mirror 4 installed obliquely behind the housing 1 and projected on the screen 2 from the back. 7 and 9, the lower end of the display optical unit 3 coincides with the lower end of the housing 1, and the vicinity of the center of the display optical unit 3 substantially coincides with the lower end of the screen 2. In the depth direction, the light source system in the display optical unit 3 is disposed behind the housing 1. Therefore, the size of the display device can be significantly reduced in combination with the effect described with reference to FIG.

FIG. 13 is a front view of the display optical unit 3, and FIG. 14 is a top view of the display optical unit 3. Reference numeral 5 denotes a light source system, 9 denotes an illumination system, and 19 denotes a projection system. As shown in FIG. 13, each of them has a substantially equal height relationship, and makes the overall size of the display optical unit 3 compact. As shown in the top view 14, the light source system 5 is arranged on the rear side of the apparatus, the projection system 19 is arranged near the center of the apparatus due to the relationship with the reflection mirror 4, and the illumination system 9 is arranged at the upper end of the light source system 5. And the lower end of the projection system 19 are arranged so as to connect diagonally. According to this embodiment, since the light source system 5 is located at the rear side of the apparatus, the light source can be directly accessed from the outside of the apparatus, so that the light source can be easily replaced.

Accordingly, the display optical unit 3 can be made sufficiently compact in its height, depth and width, and the optical path from the reflection mirror 4 to the screen 2 (FIG. 6).
(Indicated by a dashed arrow). That is, the lower end of the optical path from the reflection mirror 4 to the screen 2 is inclined as shown in FIG. 6, so that there is a margin in the height direction below the optical path toward the rear of the device. In this embodiment, the display optical unit 3 is disposed immediately below the reflection mirror 4 and on the rear side in the depth direction of the apparatus. Therefore, the display optical unit 3 can be disposed in the display device 20 at a higher position than in the related art. Screen 2 as shown in FIG.
The dimension protruding from the lower end of the is greatly reduced. Therefore,
The housing 1 has a smaller dimension below the screen 2 so that the entire apparatus can be made extremely compact.

Further, since the display optical unit 3 is disposed on the rear side of the apparatus, the reflection mirror 4 is located on the rear side of the housing 1 more than substantially half in the depth direction. Therefore, the distance between the reflection mirror 4 and the screen 2 is ensured to prevent the image quality performance from deteriorating due to undesired reflected light from the screen and the like, and the area of the reflection mirror can be reduced. Has greatly contributed to the

FIGS. 10 to 12 are component arrangement diagrams of the display optical unit in the display optical unit 21 for explaining the present invention. 10 is a front view, FIG. 11 is a top view, and FIG. 12 is a side view.

Reference numeral 5 denotes a light source system. Reference numeral 6 denotes a main reflector which holds a light emitting source tube therein. In this embodiment, the cross section has an elliptical shape in order to focus light on a light pipe 13 described later. That is, the tube is arranged at a position substantially coincident with the first focal point of the main reflector 6, and arranged so that the vicinity of the entrance opening of the light pipe 13 substantially coincides with the second focal point. Also, depending on the combination with the illumination system, it is natural that the cross section may have various shapes such as a parabolic shape.
Reference numeral 7 denotes a sub-reflector for improving the light use efficiency of the light source. In the state of being mounted on the display device 20 in this embodiment, the light is arranged with the main reflector 6 side down and light is emitted substantially upward. By arranging in this manner, a predetermined distance from the bulb, that is, the first focal point to the second focal point, can be secured, so that the light condensing property is enhanced and the light use efficiency in the illumination system 9 is improved.

Reference numeral 8 denotes a reflection mirror which bends the light emitted from the light source system 5 by approximately 90 degrees or more and makes the light enter the illumination system 9. By bending the reflection mirror 8, the illumination system 9 is disposed obliquely as a whole, and the light enters from above and is guided downward. The reflection mirror 8 is formed with a film that absorbs or transmits a region other than visible light such as ultraviolet light and infrared light, so that unnecessary light is prevented from being incident on the illumination system 9 to cause adverse effects due to heat. Also, all the visible light emitted upward from the light source system 5 is incident on the illumination system 9 by the reflection mirror, and the light is radiated downward in the illumination system 9, so that the leakage light affects the screen 2 on the front of the apparatus. Is reduced.

A color disk 10 includes a motor 11 and a color filter 12. The color filter 12 is composed of segments corresponding to the RGB colors, and separates the colors in a time-division manner by the rotation of the motor 11. Reference numeral 13 denotes a light pipe, which spatially uniformizes light emitted by the color filter 12 and emits the light. 1
Reference numerals 4 and 15 denote illumination system lenses which irradiate the light emitted from the light pipe 13 to the display element 18 at a predetermined magnification and with aberration corrected. As the light pipe, there are a hollow type having a reflective surface on the inner surface and a solid type. The illumination system 9 has the functions of color separation, magnification, and aberration correction as described above. When the illumination system 9 is arranged obliquely, the height dimension is substantially equal to the height dimension of the light source system 5. In addition, the oblique configuration prevents the size in the lateral direction from being unnecessarily increased. Thereby, the height dimension and the lateral dimension of the display optical unit 3 do not become unnecessarily large.

Reference numeral 16 denotes a reflection mirror, and an illumination system lens 15
Is emitted from the light source and bent into the prism 17 from the side. The light that has entered the prism 17 is bent by the internal reflection surface and enters the display element 18 disposed below the prism 17. The display element 18 is located at the lowermost end of the display optical unit 3 and has the same height relationship as the lowermost end of the light source system 5 described above. Since the display element 18 is at the lowermost end, it is less likely to be thermally affected by other factors inside the device, and the cooling mechanism can be simplified. Further, since the illumination system 9 is configured obliquely, the distance between the display element 18 and the light source system 5 can be separated by a predetermined amount, so that the display element 18 is hardly affected by the heat of the light source system 5. Therefore, it is easy to reduce the size and weight of the cooling mechanism and thus the display device 20, and to stabilize the performance of the display element 18.

The display element 18 is of a reflection type, and the reflected light enters the prism 17 again, and only the desired light is projected onto the projection system 19.
Incident on. Light is emitted from the projection system 19 toward the reflection mirror 4, that is, substantially upward. The projection system 19 has a height dimension substantially equal to that of the light source system 5, and as a result, the height dimension of the display optical unit 3 is not unnecessarily enlarged.

The housing 30 for holding the color disk 10 will be described with reference to FIGS. FIG.
Is an explanatory view showing the configuration of the housing 30, FIG. 16 is a sectional view of the housing 30, FIG. 17 is an explanatory view showing the internal structure of the housing 30, (1) is a structure on the cover side, and (2) is
Indicates the structure on the motor holder side.

In the figure, reference numeral 30 denotes a housing, which comprises a motor holder 31 and a disk cover 32. The motor 11 is fixed to the motor holder 31, and the cover 32 engages with the motor holder 31 and encloses the color filter 12.

Reference numerals 33 and 34 denote openings for passing light beams, and when combined, the openings 33 and 34 for passing light beams substantially coincide with each other. Reference numeral 35 denotes a wall as a structure provided on the motor holder 31 and is provided concentrically with the color disk 10. Reference numeral 36 denotes a wall provided as a structure provided on the cover 32. The walls 35 and 36 are separated from the color filter 12.

The walls 35 and 36 allow the flow of air generated in the outer peripheral direction of the color filter 12 due to the rotation of the color filter 12 to be rectified by the walls, whereby the air flow becomes smooth and large eddies are less likely to be generated. Decreases, contributing to noise reduction.

In addition, the noise from the central portion such as the mechanical noise of the motor also has the effect of a shielding plate on the side wall in the side direction, so that the noise can be reduced.

The structure may have the shape shown in FIG. FIG. 18 is an explanatory view showing the internal structure of the housing. (1) shows the structure on the cover side, and (2) shows the structure on the motor holder side.

Reference numeral 41 denotes a circular wall as a structure provided on the motor holder 31, which is concentric with the color disk 10. The portion of the light beam passage opening 33 is cut out so as not to block the light beam incident on the color filter 12.

Reference numeral 42 denotes a circular wall as a structure provided on the cover 32, which is concentric with the color disk 10. The portion of the light beam passage opening 34 is cut out so as not to block the light beam emitted from the color filter 12. The height is a height separated from the color filter 12 as in the above-described embodiment.

According to this structure, the space in which the air flows can be made smaller, and the vortex becomes smaller than the vortex of the air flow generated in the large space. As a result, the noise is reduced and the noise is reduced.

When the space is large, the overall flow velocity is high due to the high flow velocity on the outer peripheral side having a large radius. However, when the space is divided into small spaces, the internal flow velocity is slowed down by the small radius, so that noise is reduced. Become smaller.

In addition, the noise from the central portion such as the mechanical noise of the motor also has the effect of a shielding plate on the side wall in the side direction, so that the noise can be reduced.

Further, the structure may be as shown in FIG. FIGS. 19A and 19B are explanatory views showing the internal structure of the housing. FIG. 19A shows the structure on the cover side, and FIG. 19B shows the structure on the motor holder side.

Reference numeral 51 denotes a projection having a circular cross section as a structure provided on the motor holder 31, and a light beam passage opening 33.
Except for the part, a plurality of them are arranged concentrically with the color disk 10.

Reference numeral 52 denotes a projection having a circular cross section as a structure provided on the cover 32, and a plurality of projections are arranged concentrically with the color disk 10 except for the light beam passage opening 33. The height is a height separated from the color filter 12 as in the above-described embodiment.

The air flow generated in the outer peripheral direction of the color filter by the rotation of the color filter 12 hits the projections 51 and 52, thereby reducing the vortex. As a result, the noise is reduced and the noise is reduced.

In addition, the noise from the central portion such as the mechanical noise of the motor also has the effect of a shielding plate in the lateral direction due to the plurality of projections, so that the noise can be reduced.

[0045]

As described above, according to the present invention, a silent display device is provided by providing a structure such as a wall for rectifying the flow of air and a protrusion for reducing the vortex of air on the opposite surface of the color disk. Can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of the appearance of a display device as an embodiment of the present invention.

FIG. 2 is a top view showing an example of an appearance of a display device as an embodiment of the present invention.

FIG. 3 is a side view showing an example of the appearance of a display device as an embodiment of the present invention.

FIG. 4 is a front view showing a display optical unit of the display device as the embodiment of the present invention.

FIG. 5 is a top view showing a display optical unit of the display device as the embodiment of the present invention.

FIG. 6 is a side view showing a display optical unit of the display device as the embodiment of the present invention.

FIG. 7 is a front view illustrating an example of an appearance of a display device as an embodiment of the present invention, and is a partially cutaway view illustrating an internal optical unit.

FIG. 8 is a front view showing an example of an appearance of a display device as an embodiment of the present invention, and is a partially broken view showing an internal optical unit.

FIG. 9 is a front view showing an example of an appearance of a display device as an embodiment of the present invention, and is a partially cutaway view showing an internal optical unit.

FIG. 10 is a front view showing an arrangement relationship of optical components of a display optical unit as an embodiment of the present invention.

FIG. 11 is a top view illustrating an arrangement relationship of optical components of the display optical unit according to the embodiment of the present invention.

FIG. 12 is a side view showing an arrangement relationship of optical components of the display optical unit according to the embodiment of the present invention.

FIG. 13 is a front view showing an optical unit as an embodiment of the present invention.

FIG. 14 is a top view showing an optical unit as an embodiment of the present invention.

FIG. 15 is an explanatory diagram illustrating a configuration of a housing as an embodiment of the present invention.

FIG. 16 is a sectional view of a housing as an embodiment of the present invention.

FIG. 17 is an explanatory diagram showing an internal structure of a housing as an embodiment of the present invention.

FIG. 18 is an explanatory diagram showing an internal structure of a housing as an embodiment of the present invention.

FIG. 19 is an explanatory diagram showing an internal structure of a housing as an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Screen, 3 ... Display optical unit, 4 ... Reflection mirror, 5 ... Light source system, 8 and 18 ... Reflection mirror, 9 ... Illumination system, 10 ... Color disk, 11 ... Motor, 12 ... Color filter , 18 display element, 19 projection system, 20 display device 21 display optical unit, 30 housing, 31 motor cover, 32 cover, 35, 36 wall, 41, 42 wall, 51, 52 ... Protrusions,

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G03B 21/00 G03B 21/00 D G09F 9/00 302 G09F 9/00 302 337 337Z 360 360N H04N 9/31 H04N 9 / 31 C (72) Inventor Shuji Kato 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in Digital Media System Division, Hitachi, Ltd. 2H088 EA15 HA12 HA28 MA20 2H089 HA40 QA16 TA12 TA16 TA17 TA18 2H093 NA65 ND60 NG02 5C060 BA04 BA09 BB13 BC01 EA01 GA02 GB06 HC17 JA00 5G435 AA06 CC12 DD02 DD07 EE02 FF03 GG01 GG03 GG08 GG12 GG13 GG21 GG28 GG46 LL15

Claims (5)

[Claims] 1. A light source system having a light source, an illumination system for irradiating light from a light source to a display element, a display element for controlling and emitting the emitted light, and a projection system for projecting light from the display element A display optical unit comprising: and an illumination system,
A color disk on which a filter for separating a desired color is fixed, and wherein the color disk is rotated to separate colors in a time-division manner, wherein the color disk is A display device, comprising: a structure for suppressing noise caused by rotation of the color disk, on a surface of the motor holding member to which the rotationally driven motor is fixed facing the color disk. 2. A light source system having a light source, an illumination system for irradiating light from the light source to a display element, a display element for controlling and emitting the emitted light, and a projection system for projecting light from the display element. A display optical unit comprising: and an illumination system,
A color disk on which a filter for separating a desired color is fixed, and a display device configured to separate colors in a time-division manner by rotating the color disk, wherein the color disk is A cover that engages with a motor holding member to which a rotationally driven motor is fixed is provided, and a structure for suppressing noise due to rotation of the color disk is provided on a surface of the cover facing the color disk. Characteristic display device. 3. The display device according to claim 1, wherein the structure is a wall for rectifying a flow of air generated by rotation of the color disk. 4. The display device according to claim 1, wherein the structure comprises a plurality of protrusions for reducing a vortex of air generated by rotation of the color disk. 5. The display device according to claim 1, wherein the structure is a plurality of wall surfaces arranged concentrically with the color disk.