JP3242764B2 - Display screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display screen used in a display / imaging apparatus in which a projection display apparatus and an imaging apparatus used in a TV telephone, a TV conference system, and the like are combined.

[0002]

2. Description of the Related Art In recent years, with the development of communication technology such as image coding technology, two-way video communication such as a TV telephone and a TV conference system connecting remote locations by a video / voice communication network has been rapidly spreading. . In the future, it is expected that a more realistic video service can be provided by the enhancement of the ISDN network and the increase in the bandwidth of the transmission network.

FIG. 5 shows a display / imaging device currently used for two-way video communication. The imaging device 2 is located on the upper surface or side surface of the display device 1 such as a CRT display, and captures an image of the user M. However, the user M who uses such a device usually looks at the display device 1, so that even if the user M shoots with the imaging device 2, the user M does not look at the imaging device 2. . For this reason, there has been a drawback in that even if it is possible to transmit a video full of a high sense of reality, the conversation between the interlocutors is unnatural because their eyes do not match.

[0004] A system using a minutely divided half mirror has been devised as a system that matches the lines of sight of interlocutors and can also support a large screen display used in a TV conference system or the like (M. kuriki et al.). , "An
Eye-ContactTechnique for
Large-Screen DisplaysUsi
ng a Blazed Half-Transpar
ent Mirror (BHM) ", SID '93
Digest, pp 919, 1993).

This half mirror is a half mirror (hereinafter, referred to as a micro semi-transparent mirror array 4) formed by arranging a large number of minute half mirrors 4a inclined by θ as shown in FIG. FIG. 7 shows a configuration of a display / image pickup apparatus according to this method. In the display device 1, a projection type display device 1 ′ is installed in a frame 9 having a display screen 8, and an image is projected and displayed on the display screen 8 from within the frame 9. The infinitesimal semi-transparent mirror array 4 shown in the display surface in front of the display screen 8 in FIG. 6 is installed, in the imaging device 2 is installed a reflection image from the minute half mirror array 4 from the normal direction to the direction of reflection of 2θ The imaging enables optical imaging from within the display surface, that is, imaging from the user M's line of sight.

[0006]

However, as shown in FIG. 7, the micro semi-transparent mirror array 4 is installed in front of the display screen of the display device 1 (in this case, in front of the display screen 8). If the display screen 8 and the micro semi-transparent mirror array 4 are not installed in close contact with each other, there is a disadvantage that moire occurs. In particular, when the micro-semi-reflective mirror array 4 has a large area, the mirror itself may be warped or undulated, so that the mirror cannot be brought into close contact with each other, and moire is remarkably generated, and the image quality of the display screen is significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to improve the image quality of a display screen in a large-screen display / imaging device used for a TV telephone, a TV conference system, or the like. To provide a display screen that enables

[0008]

To achieve the above object, according to an aspect of the display in the screen, the projection than the screen behind Ri consists of at least one micro-screen of the present invention
Provided the image from the screen region and at least one inclined micro mirror is displayed on the screen forward Ri formed that
The screen region and the reflection region are alternately arranged.

Further , in the display screen of the present invention ,
Is a screen area consisting of one microscreen and
It is composed of the reflective region consisting of fine single inclined micro mirrors
The screen area and the reflection area are alternately arranged.
It is, when the micro-mirror pitch and slope of the reflection region is d and θ respectively, between the pitch D of the fine screen of the screen area, to satisfy the relation of D = d · tanθtan2θ, the imaging apparatus This is preferable from the viewpoint of preventing the display image from being reflected.

[0010]

[Action] In the display screen of the present invention uses a plurality of infinitesimal screen and infinitesimal mirror divided minutely, to form a screen area and the reflective area, by arranging this screen region and the reflective region are alternately , while enabling eye contact with the imaging of the reflected image from the reflective region when used in display and imaging apparatus, by integrating the screen and mirror, both has occurred because it can not contact moiré And to improve the image quality of the display screen.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a side view of a first embodiment of a display screen used in a display / image pickup apparatus according to the present invention. The basic concept of the display screen 3 according to the present embodiment is that a mirror 5 'and a screen 6', which are tilted in opposite directions by angles θ and φ with respect to a plane, are minutely divided, and the divided minute screen 6 and the minute mirror 5 are the same. It is a screen that is rearranged and integrated in a plane. (A) in FIG. 1 shows a case where the screen area is constituted by one micro screen 6 and the reflection area is constituted by one micro mirror (b) in FIG.
Shows a case in which each is constituted by a plurality of (two in the example in the figure) microscreens or micromirrors. An ordinary display screen generally includes a Fresnel lens, a lenticular lens, and a medium (scattering layer) for forming a projected image. In the present embodiment, the micro screen 6 having such a configuration is used. . Therefore, a decrease in luminance at the peripheral portion of the display screen which occurs when the Fresnel lens is not provided is small.

FIG. 2 shows a configuration example of a display / image pickup apparatus using a display screen according to the present embodiment. The display device 1 uses a projection type display device 1 'installed in a frame 9, and the display screen 3 uses the display device according to the present embodiment shown in FIG. It is installed in.

An image projected from the projection display device 1 'is displayed on each of the small screens 6, and the small mirror 5 tilted by θ moves the image of the subject (user M) in front of the screen in the 2θ direction. To reflect. Therefore, if the imaging device 2 is installed in the reflection direction (2θ direction) as shown in FIG. 2, the image projected by the projection display device 1 ′ is displayed on the display screen 3, and the imaging device 2 is used in front of the display screen 3. The image of the person M can be captured by the imaging device 2 from the inside of the display surface, and an image in which the line of sight matches easily can be obtained.

The fine screen 6 may be composed of the scattering layer alone. In this case, if the Fresnel lens structure is formed on the back surface of the display screen 3 of this embodiment as shown in FIG. Can be prevented from deteriorating in the peripheral area.

In the embodiment shown in FIG. 1A, the pitch D of the micro screen 6 and the pitch d of the micro mirror 5 are set.
And the inclination θ, the following relationship is satisfied: D = d · tanθtan2θ. The larger the value of D, the higher the brightness of the projected display screen, but there is a drawback in that when the imaging device 2 captures a reflected image, the display image on the minute screen 6 is also captured at the same time. However, in the case of the present embodiment, when the display screen 3 is viewed from the imaging device 2, the maximum value of D (= d · tan θtan 2θ) for making the micro screen 6 invisible due to the tilted micro mirror 5 is used. Therefore, there is no reflection on the reflection image on the display screen,
There is no significant reduction in display brightness.

Embodiment 2 FIG. 3 shows a sectional view of a display screen according to a second embodiment of the present invention. The configuration shown in FIG. 3 is different from the display screen shown in FIG.
Is 0 °. Angled tip of the infinitesimal mirror 5 at this time, protrudes from the infinitesimal screen 6. When the display screen 3 having the configuration shown in FIG. 1 is used, when the display screen is projected from the normal direction of the display screen 3, the display light does not go in the direction of the subject (front) due to the refraction effect. Therefore, the display screen may be dark. For it,
In this embodiment, since the incident surface and the outgoing surface of the display light are parallel to each other, the display light is not deflected due to the refraction effect as described above, and a decrease in display luminance can be prevented.

[Embodiment 3] FIG. 4 shows a configuration diagram of a display screen according to a third embodiment of the present invention. In the configuration shown in FIG. 4, unlike the display screen 3 as shown in FIG. 1, infinitesimal mirror 5 and infinitesimal screen 6
Are alternately arranged so as to sandwich the transparent body, and the direction in which the minute screen 6 tilts when viewed from the light incident side is the opposite direction. Therefore, when the display screen is projected from obliquely below, the display light is directed toward the subject due to the refraction effect. On the other hand, in the configuration shown in FIG. 4, imaging is performed obliquely from above, so that the captured image is distorted due to a difference in optical path difference. For example, when the subject is a square, the image is captured as a trapezoid whose upper side is long. However, in the present embodiment, since the projection direction is obliquely downward, on the contrary, the influence of the optical path difference is cancelled, and distortion generated in the captured image can be corrected when projected and displayed.

In each of the above embodiments, the rear projection type display in which the projection type display device 1 'is installed on the back surface of the display screen 3 has been described. However, it goes without saying that a similar effect can be obtained. However, in this case, the arrangement of the projection display device 1 'and the imaging device 2 in FIG. 2 is interchanged. In addition, a micro mirror 5 configured to reflect a reflected image of a subject upward.
Has been described, but it goes without saying that the same effect can be obtained by using the micromirror 5 configured to reflect downward or to the left and right. At that time, the direction in which the display screen is projected naturally changes accordingly. further,
Except for (b) in FIG. 1, the case where the screen area and the reflection area are constituted by one small screen or a small mirror is illustrated. Needless to say,

[0020]

As described above, according to the present invention, a display screen composed of a plurality of minute screens and a micromirror can be easily aligned with the line of sight simply by installing the display screen in front of the projection display device and the imaging device. An image pickup device can be realized, and moire generated when a half mirror is installed on a display screen or image distortion generated at the time of image pickup can be prevented or corrected, so that the image quality of a display screen can be improved. further,
Since the number of optical elements through which the display light is transmitted is reduced, there is also an effect of reducing a loss due to the optical elements, that is, a reduction in luminance of a display screen.

[Brief description of the drawings]

FIG. 1 is a diagram showing the concept and configuration of a display screen used in a display / imaging apparatus showing one embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of a display / imaging apparatus using a display screen according to the first embodiment.

FIG. 3 is a configuration diagram of a display screen according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a display screen according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a configuration example of a conventional display / imaging device.

FIG. 6 is a cross-sectional view of a conventional micro semi-transparent mirror array.

FIG. 7 is a configuration diagram of a display / imaging apparatus that achieves eye-gaze matching using the above-described conventional micro-semi-reflective mirror array.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Display apparatus 1 '... Projection display apparatus 2 ... Imaging apparatus 3 ... Display screen 4 ... Micro semi-transparent mirror array 5 ... Micro mirror 6 ... Micro screen 7 ... Fresnel lens

Continuation of the front page (72) Inventor Takahiro Muraki 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-5-68246 (JP, A) JP-A-3-283889 (JP, A) JP-A-63-240283 (JP, A) JP-A-5-168005 (JP, A) JP-A-3-71342 (JP, U) JP-A-2-55202 (JP, U) ( 58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 21/62 G02B 5/00 G02B 5/08 H04N 5/74 H04N 7/15

Claims (2)

(57) [Claims] 1. The method according to claim 1, wherein the at least one micro-screen comprises at least one micro-screen.
A screen area for displaying an image projected from behind the screen and at least one tilted micromirror.
And a reflective area provided in front of the screen .
A display screen, wherein the screen areas and the reflection areas are alternately arranged. 2. A screen area comprising one micro-screen and a reflection area comprising one inclined micro-mirror .
The screen area and the reflection area alternately
The display is characterized in that, when the pitch and the inclination of the micromirrors of the reflection area are d and θ, respectively, the relationship of D = d · tanθtan2θ is satisfied with the pitch D of the microscreen in the screen area. screen.