JPH06245209A - Camera integrated display device - Google Patents

Abstract

PURPOSE:To display a proper display picture without using a special camera by providing a hole to a polarizing plate arranged to a rear side of a liquid crystal layer and providing a camera receiving light from a front side received from the hole. CONSTITUTION:A liquid crystal display section 2 is composed of a liquid crystal layer 3, a couple of transparent glass bodies 4a, 4b each having a drive element, a p polarizing late (polarizing plate at front side) 5a and an S polarizing plate (polarizing plate at rear side) 5b. A back light section 6 is provided at a further rear side of an S polarizing plate 5b. A small hole 7 receiving the light from the front side is formed almost in the middle of the S polarizing plate 5b. One end of an L shaped camera lens body 8 is inserted into the hole 7, and a CCD camera 9 is connected to the other end of the lens body 8. Light from a viewer side passes through the P polarized plate 5a and is made incident in the hole 7 through the liquid crystal layer 3 and the viewer is picked up by a camera 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera-integrated display device used in video conferences, video telephones and the like.

[0002]

2. Description of the Related Art In a face-to-face conversation such as a video conference, if the viewer and the other party on the display screen do not have a line of sight, the sense of presence is lost and the efficiency of the conference decreases. Therefore, various camera-integrated display devices that realize line-of-sight matching have been proposed. For example, a liquid crystal display unit is provided with a hole opening in its front face, and the light taken in through the hole is configured to enter the camera (see Japanese Patent Laid-Open No. 3-26189), or on the rear side of the liquid crystal display unit. A configuration in which a camera is arranged and an image display mode in which an image is displayed on the liquid crystal display section and an image pickup mode in which the liquid crystal display section is entirely transmitted through and imaged by the camera are alternately repeated (Japanese Patent Laid-Open No. 64-11076). There is).

[0003]

However, in the former case, since the liquid crystal display surface has holes, the display image is lost, and if the diameter of the holes is reduced to prevent this as much as possible, the image pickup light remarkably decreases. It had the drawback of requiring expensive special cameras.

In the latter case, in view of the response speed of liquid crystal display, the repetition of image display and full-surface transmission causes surface flicker, which causes a significant deterioration in image quality.

On the other hand, in the conventional camera-integrated display device, the position where the viewer sits is limited with respect to the positions of the display and the camera. Therefore, when moving to search for a document during a meeting or standing up and talking while walking, the image of this is not displayed on the device of the other party.

Therefore, according to the present invention, there is no omission in the displayed image or surface flicker, and
An object is to provide a camera-integrated display device capable of displaying an appropriate display image without using a special camera. Another object of the present invention is to provide a camera-integrated display device in which the position of the viewer is not restricted by automatically tracking the viewer even if the viewer moves.

[0007]

In order to achieve the above object, a camera-integrated display device according to the present invention is provided with a liquid crystal layer drivable in a display body, and a front side and a rear side of the liquid crystal layer. Side polarizing plate and a rear side polarizing plate disposed on the rear side of the rear polarizing plate respectively, and the liquid crystal layer controls the transmission of light from the backlight side to the front side. In a camera-integrated display device that creates an image by
The rear side polarizing plate is provided with a hole for taking in light from the front side, and a camera for taking in the light taken in through the hole is provided.

In another camera-integrated display device according to the present invention, a liquid crystal display unit is arranged in the display body, and a camera is installed in the display body.
In a camera-integrated display device that displays an image on the liquid crystal display unit and captures a viewer with the camera,
The display main body is provided so as to be swingable in the vertical and horizontal directions, the output video signal of the camera is analyzed to detect the movement of the viewer, and the swinging of the display main body is controlled in accordance with the detected movement amount for viewing. It is provided with an automatic tracking means for tracking a person.

[0009]

According to the former invention, it is determined whether or not the light from the backlight unit is transmitted to the viewer side depending on the molecular arrangement state of the liquid crystal layer, and the viewer can see the image while the viewer side can see the image. The light from the light passes through the polarizing plate on the front side and also enters the hole through the liquid crystal layer in any molecular alignment state, and the viewer is imaged by the camera. Therefore, it is only necessary to drive the liquid crystal display unit to display only the display image, holes are not formed in the front polarizing plate and the liquid crystal layer, and the holes of the rear polarizing plate cannot be seen by the viewer. Can be the diameter of.

Further, according to the latter invention, when the viewer moves, the motion is detected and the direction of the display main body is directed to the position facing the viewer.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. Figure 1
1A is a front view of a camera-integrated display device, FIG.
(B) shows the longitudinal cross-sectional view, respectively. 1A and 1B, the display main body 1 has a box shape having a display frame 1a on the front surface, and the liquid crystal display unit 2 is arranged in the display main body 1.

In this embodiment, the liquid crystal display section 2 is composed of a TN type (twisted nematic type) normally white thin film transistor liquid crystal panel, and is provided with a liquid crystal layer 3 and a pair of transparent glasses with driving elements which are closely attached to both sides thereof. From the bodies 4a and 4b and the P-polarizing plate 5a (front-side polarizing plate) and the S-polarizing plate 5b (rear-side polarizing plate) arranged on the front side and the rear side of the pair of transparent glass bodies 4a and 4b, respectively. It is configured. The rear surface of the rear transparent glass body 4b is provided with a non-reflective coating, and the S polarizing plate 5b is arranged at a constant distance d from the rear transparent glass body 4b.

Further, a backlight portion 6 is provided further on the rear side of the S polarizing plate 5b, and the backlight portion 6 emits light toward the front side. The backlight unit 6 is composed of a cold cathode type or hot cathode type fluorescent lamp, an organic electroluminescent sheet, a halogen lamp, an LED, a plasma light emitting panel, and the like, and in this embodiment, it is configured to irradiate light that is nearly omnidirectional. Has been done.

On the other hand, a small hole 7 for taking in light from the front side is formed in the approximate center of the S polarizing plate 5b. One end of the L-type camera lens body 8 is inserted into the hole 7, and the other end side of the L-type camera lens body 8 is arranged outside the display body 1. A CCD camera 9 (camera) is connected to the other end of the L-shaped camera lens body 8.

The display main body 1 is controlled by the automatic tracking means A to swing vertically and horizontally. That is, the display main body 1 is provided so as to be swingable in the vertical direction with respect to the rotary frame body 10, and a swinging force is applied to the display main body 1 by the vertical direction motor 11. Further, the rotary frame body 10 is provided so as to be swingable in the left-right direction with respect to the base 12, and a swinging force is applied to the rotary frame body 10 by a left-right direction motor 13.
In FIG. 1A, 14 is a capeka.

FIG. 2 is a circuit block diagram of the automatic tracking means A. In FIG. 2, the output video signal of the CCD camera 9 and the output video signal of the scanner 15 are switched by the switching means 16.
Is selectively guided to the modulator 17, and the audio signal of the microphone 17 is also guided to the modulator 17, and after each of the video and audio signals is subjected to predetermined modulation, the other party's camera is connected via the communication line. Sent to the physical display device.

The output video signal of the CCD camera 9 is also guided to the contour extracting circuit 18, and the contour extracting circuit 18 extracts the contour by detecting a sharp change in frequency.
This contour data is supplied to the shape recognition circuit 19, and the shape recognition circuit 19 lists the human head shape from the input contour data. The human head shape data is supplied to the comparator 20, which compares the input human head shape data with the reference shape data to obtain the comparison data.
1 and output to the size detection circuit 22. Deviation detection circuit 21
Detects a shift amount in the vertical and horizontal directions with respect to the reference shape data from the comparison data, and outputs a drive control signal to each of the vertical direction motor 11 and the horizontal direction motor 13 so as to make the shift amount zero. The size detection circuit 22 detects the size ratio of the head with respect to the reference shape data from the comparison data, and outputs a drive control signal to the zoom motor 23 so as to set the size ratio to 1. A zoom lens (not shown) is moved by the zoom motor 23. Although not shown, an autofocus mechanism is also provided.

The operation of the above configuration will be described below. The light of the backlight unit 6 passes through the S polarizing plate 5b and becomes S wave light, which is projected onto the entire surface of the liquid crystal layer 3. Then, depending on whether or not the electric field is applied to each part of the liquid crystal layer 3, the S-wave light is kept as it is, or
The P-wave light is polarized and projected on the P polarizing plate 5a. Only the P-wave light of the S-wave and P-wave light is transmitted through the P-polarizing plate 5a and is irradiated to the outside, so that a viewer can see a desired image.

On the other hand, the external light on the viewer side is P polarizing plate 5a.
And is converted into P-wave light and projected onto the entire surface of the liquid crystal layer 3.
Then, depending on whether or not an electric field is applied to each part of the liquid crystal layer 3, P
S-polarized light 5b as wave light or deflected to S-wave light
To reach. That is, although there is a difference between P-wave light and S-wave light as the external light, since the light enters the hole 7 regardless of the state of the liquid crystal layer 3, the viewer's image can be taken by the CCD camera 9. Since the viewer is looking at the liquid crystal display unit 2, line-of-sight coincidence is realized, and since the liquid crystal display unit 2 displays only the display image, image flicker does not occur, and holes are formed in the P polarizing plate 5a and the liquid crystal layer 3. Since it is not formed, no dropout occurs in the display image.
Further, since the hole 7 cannot be seen by the viewer, it is not necessary to reduce the diameter of the hole 7 more than necessary, and an appropriate image can be taken without using a special camera.

Further, since the light from the backlight section 6 is not projected onto the hole 7 of the S polarizing plate 5b, there is a concern that the backlight will not emit light, which may affect the image. The directional characteristics are close to omnidirectional,
A certain distance d is provided between the transparent glass body 4b and the S polarizing plate 5b.
The effect on the image is prevented by having the. Also, making the diameter of the hole 7 as small as possible is effective in eliminating the influence on the image.

Further, it is conceivable that the light from the backlight portion 6 reflects on the transparent glass body 4b and enters the hole 7, but since the surface of the transparent glass body 4b is coated with a non-reflective coating, the backlight is formed. Light from the portion 6 does not enter the hole 7.

On the other hand, when the viewer moves in the vertical and horizontal directions, the deviation detection circuit 21 detects the deviation amount and changes the direction so that the display body 1 faces the viewer.
The viewer is always shown in the center of the screen. Further, when the viewer moves in the front-rear direction, the size detection circuit 22 detects the size of the image of the viewer and changes the zooming state so that the size becomes a reference size, so that the viewer is always displayed in a constant size. Be done. Therefore, the viewer can have a video conference without paying attention to the sitting position and posture.

In this embodiment, the TN type liquid crystal display unit 2 is used.
However, the present invention can be similarly applied as long as the liquid crystal layer 3 has polarizing plates 5a and 5b on both the front side and the rear side.

[0024]

As described above, according to the first aspect of the present invention, the polarizing plate on the rear side of the liquid crystal display is provided with a hole, and the light taken in through the hole is incident on the camera. Therefore, since the liquid crystal display unit is driven to display only the display image, image flicker does not occur, and since no holes are formed in the polarizing plate and the liquid crystal layer on the front side, the display image does not drop, and further, Since the size of the hole of the rear side polarizing plate is allowed to some extent, it is possible to display an appropriate display image without using a special camera.

According to the second aspect of the invention, the display main body is provided so as to be vertically and horizontally swingable, and the automatic tracking means for detecting the movement of the viewer and tracking the movement is provided. When the position of is moved, it is tracked and the position of the viewer is not limited.

Further, according to the third aspect of the invention, a hole is formed in the polarizing plate on the rear side of the liquid crystal display portion, and the light taken in through the hole is made to enter the camera, and the display body is vertically moved. Since it is provided so as to be swingable in the left-right direction and the automatic tracking means for detecting the movement of the viewer and tracking the movement is provided, an appropriate display image can be displayed without using a special camera as in the invention according to claim 1. Since the image can be displayed and the viewer is automatically tracked, the position of the viewer is not limited.

[Brief description of drawings]

FIG. 1A is a front view of a camera-integrated display device, and FIG. 1B is a longitudinal sectional view thereof (embodiment).

FIG. 2 is a circuit block diagram of an automatic tracking unit (embodiment).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Display main body 2 ... Liquid crystal display part 3 ... Liquid crystal layer 5a ... P polarizing plate (front side polarizing plate) 5b ... S polarizing plate (rear side polarizing plate) 6 ... Back light part 7 ... Hole 9 ... CCD camera ( Camera) A ... Automatic tracking means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 7/18 G

Claims (3)

[Claims] 1. A liquid crystal layer configured to be drivable in a display body, polarizing plates respectively arranged on a front side and a rear side of the liquid crystal layer, and further arranged on a rear side of the polarizing plate on the rear side. In the camera-integrated display device for producing an image by controlling the transmission of light from the backlight unit to the front side by the liquid crystal layer, the rear side polarizing plate from the front side is provided. The camera-integrated display device is characterized in that a hole for taking in the light is provided and a camera for taking in the light taken in from the hole is provided. 2. A camera-integrated display device in which a liquid crystal display unit is arranged in the display main body, a camera is installed in the display main body, an image is displayed on the liquid crystal display unit, and a viewer is taken by the camera. The display main body is provided so as to be swingable in the vertical and horizontal directions, the output video signal of the camera is analyzed to detect the movement of the viewer, and the swinging of the display main body is controlled according to the detected movement amount. A camera-integrated display device comprising an automatic tracking means for tracking a viewer. 3. The display main body is provided so as to be vertically and horizontally swingable, the output video signal of the camera is analyzed to detect a motion of a viewer, and the display main body is rocked according to the detected motion amount. The camera-integrated display device according to claim 1, further comprising: an automatic tracking unit that controls the camera to track the viewer.