JP3363632B2 - Image information display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention displays image information.
You can tilt the display screen to any angle with respect to the horizontal.
The present invention relates to an image information display device such as a display device. [0002] 2. Description of the Related Art Conventionally, a display screen for displaying image information is displayed on water.
Has a window function to tilt at an arbitrary angle to the plane
In the image information display device, regardless of the conditions around the display screen
The contrast of the image information was displayed at a constant value. What
Note that the image is given a gradation difference so that similar colors can be identified.
Display controller to display on a flat panel
2-277124) is known. [0003] SUMMARY OF THE INVENTION However, the conventional
As with image information display devices, the contrast of image information
Display at a constant value, it is easy for the user to see the display screen.
The display image may be difficult to see when tilted at an angle,
The work to make the displayed image easier to see becomes complicated
There was a problem. Also, depending on the brightness around the display screen,
Display image may be difficult to read.
There is also a problem that the work to make it easier to see becomes complicated.
Was. Further, the image information display device as described above is
Q922 (ISDN LAP)
Each image information by multimedia communication using F)
A communication conference system in which display devices mutually communicate conference information.
Is configured, the display screen of each image information display device is
If the orientation of the surface is different, the appearance of the same image information will be different
The display contents may be difficult to see. [0005] Therefore, each user can use his or her own image information display device.
Adjust the tilt of the display screen of the device and display it on the display screen.
Or adjust the contrast of the displayed image to
If it was easy to see, the work took time and the meeting
There is also a problem that communication of
Was. [0006] The present invention has been made in view of the above points.
InTableRemote control of screen orientation and horizontal tilt
The display image on the display screen so that it is not
The porpose is to do. [0007] SUMMARY OF THE INVENTION The present invention achieves the above object.
To achieveThe orientation of the display screen for displaying image information
Means for switching in the long or horizontal direction and the display screen
Means for tilting the camera at an arbitrary angle with respect to the horizontal, and a communication line
Various information with other image information display devices via
In the image information display device provided with a receiving means,
The image is displayed on the other image information display device via a communication line.
The direction of the display screen of the information display device and the inclination angle with respect to the horizontal
Means for notifying the other image via the communication line.
The orientation of the display screen from the image information display device and the inclination with respect to the horizontal
When you receive a notification of the angle,
Means for adjusting the display screen to the tilt angle, and
Means for detecting ambient brightness and detection by that means
Based on the given brightness and the tilt angle notified above.
To adjust the contrast of the image displayed on the display screen.
StepIs provided. [0008] [0009] [0010] The image information display device according to the present invention comprises:Communication line
To another image information display device through the image information display device
Of the display screen in portrait or landscape orientation and water
By notifying the inclination angle with respect to the flat, the display image
The orientation of the display screen of another image information display device depends on the content of the image.
The tilt can be remotely controlled. And other pictures
The orientation of the display screen from the image information display device and the inclination with respect to the horizontal
When you receive a notification of the angle,
Adjust the display screen to the tilt angle, and
The brightness is detected, and the brightness and the notified tilt angle are detected.
Adjust the contrast of the image displayed on the display screen based on
The angle of the display screen and the surrounding brightness.
Images can be displayed automatically with the selected contrast.
User cares about the contrast and orientation of the display screen
It is possible to always refer to an easy-to-view image without using it. [0011] [0012] [0013] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Explain physically. FIG. 1 shows an image information display apparatus according to this embodiment.
FIG. 2A is a functional block diagram showing the internal configuration of
FIG. 2 is a front view of the appearance of the image information display device according to the embodiment, and FIG.
(B) is a side view thereof. This image information display device,
As shown in FIG. 2, an LCD or the like for displaying various image information
Image display unit 1 is a display of
And is connected to the main unit 3, and the shaft 2 is
A display screen (window) for displaying image information of the image display unit 1
C) The direction of 4 is set to the portrait direction or the landscape direction with respect to the main unit 3.
Means to switch the direction and tilt at an arbitrary angle to the horizontal
It is. The image information display device shown in FIG.
Touch the various operation keys displayed on the display screen 4
Touch to indicate on the screen with the touch pen 14
A writing pad 5 such as a panel and various voice messages
A speaker 7 for outputting a message, and a
A microphone 8 is provided. Further, in G3 or G4 facsimile communication,
Store image information to be transmitted or received
Hard disk (HD) device 10 such as an optical disk device
And a keyboard for inputting operation information with various operation keys
And reads the information written in the manuscript
Facsimile machine 12 such as G3 or G4 for transmitting by simulcast
It has. Furthermore, moving picture information with an external moving picture device
Interface (I / F) that controls the input and output of the video
6 and used for G3 or G4 facsimile communication and communication
Public digital network (ISDN) 9 and data input / output
Is connected. A main unit 3 of the image information display device is shown in FIG.
As shown in FIG.
It has various functional units. Ie video ram
(VRAM) 20, graphic controller 21, C
PU22, DMA controller 23, interrupt controller
24, a memory unit 25, a serial interface (I /
F) Part 26, LAPD27, LABP28, LAPF2
9 and a media multiplexing unit 30. Further, an ISDN interface (I / F)
Section 31, SCSI section 32, serial interface (I
/ F) section 33, modem section 34, extension interface (I
/ F) section 35, HLDC section 36, RS232C interface
Interface (I / F) section 37, compression / expansion section 38, inclination angle detection
An output unit 39 and a contrast adjustment unit 40 are also provided.
In addition, a built-in brightness sensor 41 and shaft drive unit 42
are doing. A video ram (VRAM) 20 displays an image.
Memory for storing image information to be displayed on the display screen 4 of the unit 1
It is. The graphic controller 21
It controls the processing of the network. The CPU 22 controls the entire device.
Control of automatic contrast adjustment according to the present invention
Processing and automatic adjustment of the display screen of other image information display devices.
Based on control processing and instructions from other image information display devices
It also controls the automatic adjustment of the display screen. The DMA controller 23 is provided in this device.
And direct memory access control processing. Interrupt controller
The roller 24 controls the interrupt processing in this device.
Govern. The memory unit 25 stores data used for various processes.
It is a storage area. Serial interface (I / F)
The section 26 receives operation information from the writing pad section 5.
Controls force control. LAPD 27 is for ISDN D channel
Controls link access procedures. LAPB28 is
Control of ISDN B channel link access procedure
Govern. LAPF29 is ISDN F channel link
-Controls access procedures. Media multiplexing unit 3
0 is control of media multiplex communication by the public digital network 9
Take charge of processing. The ISDN interface (I / F) section 31
Is an input / output system with the public digital network (ISDN communication network) 9
Governs you. The SCSI unit 32 has an image for the HD device 10.
Control processing for reading and writing various information such as image information
Govern The serial interface (I / F) unit 33
It controls input of operation information from the keyboard 11. Model
The modulation unit 34 modulates image information during facsimile communication and
Responsible for demodulation. The extension interface (I / F) unit 35
G3 or G4 facsimile transmission and reception of image information
It is responsible for input / output and other input / output of management information. The HLDC unit 36 has a high level at the time of communication.
Manages data link control. RS232C interface
The (I / F) unit 37 is connected via the RS232C cable 13.
And controls the output of various information to an external device. Pressure
The compression / decompression unit 38 performs processing for compressing or decompressing image information.
Now. The inclination angle detector 39 detects the movement of the shaft 2.
The inclination angle of the display screen 4 with respect to the horizontal based on the
It is a tilt detecting means such as a rotary encoder that performs the tilt detection. Ko
The contrast adjustment unit 40 is controlled by the tilt angle detection unit 39.
Image to be displayed on the display screen 4 according to the detected tilt angle
Control processing for adjusting the contrast of the image to an optimum value. Ma
In addition, the inclination angle detected by the inclination angle detection unit 39 and
Around the display screen 4 detected by the brightness sensor 41
Contrast of image displayed on display screen 4 according to brightness
It also controls the control process for adjusting the cost to the optimum value. Further, the brightness sensor 41 is provided on the display screen 4.
Detecting means such as a photodiode that detects ambient brightness
It is. The shaft drive unit 42 receives an instruction from the CPU 22.
The display screen 4 in portrait or landscape orientation based on
Switch and tilt to an arbitrary angle with respect to the horizontal.
The shaft 2 is rotated and inclined. Next, according to the flowchart of FIG.
Of the display screen of the image information display device with respect to the horizontal
When adjusting the contrast of image information according to the
Will be described. This process starts image information display
Then, in step (indicated by "S" in the figure) 1, tilt angle
The detection unit 39 displays a display screen based on the amount of movement of the shaft unit 2.
Contrast adjustment by detecting the tilt angle of 4 with respect to the horizontal
Send to section 40. Proceeding to step 2, the contrast adjusting section 4
0 determines the optimal value of contrast according to the tilt angle
The contrast of the image displayed on the display screen 4
Adjust to the optimal value and proceed to step 3 to check whether the display is complete or not.
Judge and perform the above-mentioned contrast adjustment processing until the end of display.
Repeat this contrast adjustment process at the end of display.
finish. As described above, the image information table of this embodiment is
Indicating device,Detects the tilt angle of the display screen with respect to the horizontal,
Control of the image displayed on the display screen according to the tilt angle
Since the last is adjusted, a command suitable for the tilt angle of the display screen
Images can be automatically displayed in the trust
No need to adjust image contrast when tilting the screen
I'm done. That is,When an image is displayed on the display screen,
When the user tilts the display screen at an easy-to-view angle with respect to the horizontal,
The contrast of the image is automatically adjusted according to the tilt angle.
To keep the displayed image easy to read,
The user can look at the display screen without worrying aboutcontrast adjustment.
Can be tilted to an easy angle.In other words, the water on the display screen
Of the image displayed on the display screen according to the tilt angle
Adjusts the contrast so that the display screen
Always display the display image in a state that is easy to see even if the inclination changes
be able to. Therefore, the user can adjust the contrast
Tilt the display screen at an easy-to-view angle without worrying about
And the work is no longer required. Further, the image information display device of this embodiment
Depending on the tilt of the display screen with respect to the horizontal and the surrounding brightness.
Alternatively, the contrast of the image may be adjusted.
Next, according to the flowchart of FIG.
The process of adjusting the trust will be described. In this process, display of image information is started.
And tilt angle detection in step (indicated by "S" in the figure) 11
The section 39 of the display screen 4 is based on the amount of movement of the shaft section 2.
Contrast adjuster 4 detecting inclination angle with respect to horizontal
0, proceed to step 12 and display the brightness sensor 41
Contrast adjuster 4 that detects brightness around screen 4
Send to 0. Thereafter, the process proceeds to step 13 to perform contrast.
The contrast adjustment unit 40 adjusts the contrast according to the tilt angle and brightness.
The optimum value of the image is determined and the image to be displayed on the display screen 4 is determined.
Adjust the contrast to its optimal value and proceed to step 14.
Judge whether the display is completed or not.
Repeat the trust adjustment process.
The trust adjustment process ends. Thus, the image information display in this case is performed.
The equipment isThe tilt angle of the display screen with respect to the horizontal
Detects the brightness of the surroundings, and calculates the tilt angle and brightness
Adjust the contrast of the image displayed on the display screen.
The display screen tilt angle and ambient brightness.
Automatically display images with appropriate contrast
The brightness of the surroundings changes when the display screen is tilted.
The need to adjust the contrast of the image when You
That is,When an image is displayed on the display screen, the user
If you tilt the screen at an angle that is easy to see with respect to the horizontal, the tilt angle
Automatically adjusts the contrast of the image according to the surrounding brightness along with the degree.
Dynamically adjust to keep the display image easy to see
The user can always see the displayed image regardless of the surrounding brightness
It becomes.In other words, the tilt angle of the display screen with respect to the horizontal
Contrast of the image displayed on the display screen according to the brightness of the
Adjusts the brightness of the display screen.
Can always display the display image in a state that is easy to see,
The user is cautious of adjusting the contrast to suit the ambient light.
The display screen can be tilted at an easy-to-view angle without
Wear. Next, the image information display device of this embodiment is used.
Thus, a communication conference system can be configured. FIG.
A communication using an image information display device according to an embodiment of the present invention.
It is a block diagram of a teleconference system. This communication conference system uses a plurality of image information
Display device (hereinafter referred to as "communication conference terminal device") T1
Tn are connected by a communication line, and each of the communication conference terminal devices T1 to T
ISDN network for transmitting and receiving various information between
Each of the communication conference terminals T1 to Tn is connected via an ISDN network.
To exchange various types of image information, etc.
Can perform conference communication via the teleconference terminal device.
it can. This communication conference terminal device has a moving image I / F unit 6
Video devices and external display devices such as CRTs and LCDs
Device can be connected. Also, the video I / F 6
An external display device such as a video device, CRT, LCD, etc.
Video conference equipment in RS232CI / F unit 37 without connection
An external device such as a device can be connected. In that case,
Media multiplex communication such as image information and audio information is not realized
With the image display unit 1 and the writing pad unit 5,
Run only the traffic service. Each of the communication conference terminal devices T1 to Tn has an image table.
The conference screen, facsimile manuscript,
Display other documents and write pad part 5
And at the time of conference communication and telewriting
Various operations are input during the ringing communication. Movie I / F
Reference numeral 6 denotes the input of moving image information from the moving image device of
Perform output. Also, the speaker 7 and the microphone 8
Input / output voice information during conference communication, ISDN I / F
The plurality of communication devices connected to the public digital network 9 by the
Other than G3 or G4 facsimile communication with the conference terminal
Communication during conference communication. The HD device 10 has a conference
Register meeting materials and other management information used for communication.
Meetings used during conference communication by the facsimile machine 12
Enter meeting materials and other administrative information. RS23
RS232C cable 13 by 2CI / F unit 37
Outputs conference materials during a conference to connected external devices
You. Each of the communication conference terminal devices T1 to Tn
Terminal information such as the direction and angle of the display screen for the terminal device
Is communicated using Q922 by LAPF29. So
Then, each of the communication conference terminal devices T1 to Tn
When communication is performed, each terminal on the MLP information channel
Terminal information and display screen orientation based on the terminal information.
And tilt control. In addition, the display screen
Adjust the contrast of the displayed image according to the tilt and ambient brightness.
Automatically adjust to optimal conditions. Therefore, a plurality of remote users
Conference communication is performed via each of the communication conference terminal devices T1 to Tn.
Each user can always see the displayed image in the best condition.
Can be referenced. FIG. 6 shows the state of each of the communication conference terminals T1 to Tn.
FIG. 3 is a configuration diagram of a protocol stack composed of. this
The protocol stack is the protocol stack on the D channel.
And the protocol stack on the B channel and the extension
Protocol stack on interface and RS232C
It consists of the above protocol stack. D Cha
The protocol stack on the ISDN
I430 that satisfies the function and the layer 2
Q921 that satisfies the function and the layer 3 of D channel
Q931 which satisfies the function. The protocol stack on the B channel is B
Media multiplexing device for media multiplexing on channels
H221 and its media multiplexing device H221
H242 that satisfies the voice coding function
, H261 satisfying the image coding function, and B channel
X75 that satisfies the function of upper layer 2 and data multiplexing
Q922 core that satisfies the transmission function and L according to Q921
Q922 control that satisfies the AP control function
I have. Further, the function of the layer 3 on the B channel is fulfilled.
IS8208 to be added and Layer 4 function on B channel
And T224 satisfying the following, and the layer on the B channel
T62 and X225 satisfying the function of 5 and on the B channel
T73 and X226 satisfying the function of layer 6 of G3 and G3
T30 for controlling the facsimile protocol and conference communication
C & I of the application that controls the communication protocol
Have. Further, the telewriting protocol is
TW of the application to be controlled, still image information,
Application to transfer various information such as facsimile information in bulk
BULK and G4 facsimile communication
Application G4 fax and G3 fax
G3 fuck for applications that control similiar communications
Equipped. Each of the communication conference terminal devices T1 to Tn
When executing communication, H221, in the protocol stack
H242, G711, H261, Q922, X224,
X225, X226, C & I, TW, and BULK
Use a protocol stack. C & I application
Q922, X224, X225 and X226
Used to control the overall data transfer during a conference call. Q922 and X22 of TW application
4, X225 and X226 are telecommunications during conference communication.
Used to execute the writing service. BULK
Application Q922, X224, X225 and
And X226 are used to transfer image information of conference materials during conference communication.
Transfer, still image transfer, and other digital information transfer
Sometimes used. FIG. 7 shows each communication conference terminal device T1 and T2.
FIG. 3 is a diagram showing a protocol sequence of conference communication according to the first embodiment.
Conference communication is performed between the communication conference terminal devices T1 and T2.
At first, the communication conference terminals T1 and T2
Call setup procedure (CCITT recommendation Q931)
Establish a call between the devices, and when the call is established, the first channel
Connection established (CCITT Recommendation H242 standard
Forward phase A). The teleconference terminal devices T1 and T2 are connected between the two devices.
After the first channel connection probability of
Channel initialization procedure (CCITT recommendation H242 standard procedure)
Sends FAS and BAS signals on the line using
(CCITT Recommendation H221 standard procedure)
Perform force exchange. FAS signal is CCITT recommendation H221
The BAS signal is a signal used for frame synchronization of
Transfers CCITT Recommendation H221 commands and data
Signal. The teleconference terminal devices T1 and T2 are connected between the two devices.
After the initialization procedure of the first channel is completed, the video information
Call setup procedure (CC
Two between both devices using the ITT Recommendation Q931 standard procedure)
Establish eye individuals. At the time of establishment, connection of additional channel
(CCITT Recommendation H242 Standard Procedure Phase
CA). The teleconference terminal devices T1 and T2 are connected between the two devices.
After the additional channel connection is established, the B channel is added.
Channel initialization procedure (CCITT Recommendation H242 standard
FAS signal and BAS signal on the line using
(CCITT Recommendation H221 standard procedure), 56
kbps voice, 6.4 kbps MLP, 62.4 kbp
Set the transmission path for multimedia communication of moving images (CC
ITT Recommendation H242 Standard Procedure Phase CB1). The teleconference terminal devices T1 and T2 are connected between the two devices.
56 kbps voice, 6.4 kbps MLP, 62.4
Set transmission path for multimedia communication of kbps video
And audio information, video information and data information (image
(Including information). The teleconference terminals T1 and T2 transmit voice information.
When information, video information and data information can be exchanged,
Conference communication is performed between the two devices.
The telewriter uses data information transmission to the other party.
Executing facsimile communication or facsimile communication
To transfer still images or transfer other information.
Advance the meeting. Next, the communication conference terminal devices T1 and T2
The processing at the time of conference communication according to the first embodiment will be described. Figure 8 is a telecommunications meeting
Showing the processing at the time of conference communication between the conference terminal devices T1 and T2
It is a chart. In this embodiment, the communication conference terminal device T1
Is a transmitting terminal device for transmitting image information,
The terminal device T2 receives image information from the communication conference terminal device T1.
A case will be described in which the terminal device is a receiving terminal device that communicates. As shown in FIG. 8A, a communication conference terminal
The device T1 communicates in step (indicated by “S” in the figure) 21
BAS capability exchange with the conference terminal T2, step
When the mode is exchanged by proceeding to step 22, the routine proceeds to step 23.
To start conference communication. Thereafter, in step 24, the necessary
After generating the protocol stack, proceed to step 25.
To determine the image information to be displayed.
Displaying the image information on the display screen of the terminal device;
Proceed to step 27 and the display screen is displayed in portrait or landscape depending on the user.
The display can be switched to one of the long
When the inclination with respect to the flat is adjusted, the process proceeds to step 28.
Communication conference of terminal information including display screen orientation and tilt angle
Notify the terminal device T2. Then, the process proceeds to step 29, where the own terminal device
Detects the tilt angle of the display screen with respect to the horizontal
Proceed to 30 to detect the brightness around the display screen of the own terminal device.
And then proceeds to step 31 to detect the detected inclination angle and the surrounding angle.
Determines optimal image contrast based on brightness
And adjust the contrast of the displayed image to its optimal value.
To continue the conference communication. On the other hand, the communication conference terminal device T2 is
Step (shown by "S" in the figure) 4 as shown in FIG.
1 to exchange BAS capabilities with the teleconference terminal device T1,
If the process proceeds to step 42 and the mode is exchanged,
Proceed to 43 to start conference communication. Thereafter, in step 44, the necessary
After generating the protocol stack, proceed to step 45.
Receives image information from the communication conference terminal device T1, and
Proceeding to step 46, the received
The image information is displayed.
Terminal information from the terminal T1,
Switch the display screen of the terminal device to the direction of the received terminal information
Eh, tilt it to the tilt angle. Then, the process proceeds to a step 49, wherein the own terminal device
Detects the tilt angle of the display screen with respect to the horizontal
Proceed to 50 to detect the brightness around the display screen of the own terminal device.
And then proceeds to step 51 to detect the detected inclination angle and the surrounding angle.
Determines optimal image contrast based on brightness
And adjust the contrast of the displayed image to its optimal value.
To continue the conference communication. Further, the communication conference terminals T1 and T2
The processing at the time of the conference communication between will be described. Teleconference terminal
The device T1 calls a conference mode to the communication conference terminal device T2.
After the call setup, the capability with the communication conference terminal device T2 is set.
Exchange and, if successful, additional channels if necessary
Start call setup. The communication conference terminal device T1
Mode after the call setup of the additional channel with the conference terminal device T2 is completed.
Convert the code and start conference communication. MLP using Q922 during the conference communication
Create several protocol stacks in an information channel
First, only one C & I protocol stack is generated.
To achieve. After that, telewriting, facsimile, etc.
When creating a new protocol stack, C & I
It is generated by negotiation. The communication conference terminal device T1 has its own display screen.
And the same image information on the display screen of the communication conference terminal device T2.
To display, determine the image information to be displayed, and
Is displayed on the display screen of the own terminal device. And to the user
Therefore, the orientation of the display screen switches to portrait or landscape orientation.
When the tilt angle with respect to the horizontal is adjusted,
The conference terminal device T1 determines the orientation and the tilt angle of the display screen.
The information is notified to the communication conference terminal device T2 as information. Thereafter, the communication conference terminal device T1
The brightness around the display screen of the device is detected and the display screen
Display image control based on the tilt angle of the
Determine the optimal value of the last and reduce the contrast of the displayed image.
Adjust to the optimal value of. On the other hand, the communication conference terminal device T2
Display image information received from the terminal device T1 on the display screen
And terminal information received from the communication conference terminal device T1.
Of the display screen of the own terminal device based on the communication conference terminal
Same orientation as the display screen of device T1 (portrait or landscape orientation)
Direction) and switch the display screen horizontally.
The same angle as the display screen of the communication conference terminal device T1.
Adjust each time. Thereafter, the communication conference terminal device T2
The tilt angle of the display screen of the device is detected and the
Detects the brightness of the surrounding area and adjusts its inclination angle and surrounding brightness.
The optimal value of the contrast of the displayed image is determined based on the
Adjust the contrast of the displayed image to its optimal value. It should be noted that the user of the communication conference terminal device T2 is displayed.
If you change the orientation or tilt angle of the display screen,
Is notified to the communication conference terminal T1, and the communication conference terminal T
1 indicates the orientation of the display screen of the own terminal device based on the terminal information.
The angle of inclination and the angle of inclination are automatically set in the same way as the teleconference terminal device T2.
Can also be adjusted. And a communication conference terminal device.
T2 and T1 are the inclination angles of the display screen of the own terminal device, respectively.
Optimal contrast of the displayed image according to the surrounding brightness
It is automatically adjusted to a value and always easy for the user to see. Further, the communication conference terminal device T2 is connected to the communication conference terminal.
The same applies when displaying image information on the terminal device T1.
No, the display screen by the user of the communication conference terminal device T2 is not displayed.
According to the adjustment, the communication conference terminal device T1 displays its own terminal device.
Automatically adjust the screen to the same orientation and tilt angle. Soshi
The communication conference terminal devices T2 and T1 are respectively their own terminal devices.
Display image according to the tilt angle of the display screen and the surrounding brightness
Adjusts the contrast of the image to the optimal value, so that the user can always see
To adjust automatically. In this way, the communication conference system of this embodiment is
In the system, each user wants to see the picture
In order to make the image easier to see, the orientation and tilt of the display screen of the
Can be operated remotely. In addition, each user has a display screen
The display image according to the orientation and tilt of the
Since there is no need to adjust the trust,
You can proceed with your communication efficiently. [0068] As described above, according to the present invention,
According to the image information display device,This image information display device
To build a teleconference system using other image information display devices.
Remote control the display screen of the
In each image information display device, the inclination of the display screen and the surrounding light
The contrast of the image displayed on the display screen
By adjusting, the image displayed on each display screen
Each user can easily view the image,
Conference communication smoothly without worrying about
You. [0069] [0070]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a functional block diagram showing an internal configuration of an image information display device according to this embodiment. FIG. 2 is a front view and a side view of the appearance of the image information display device of the embodiment. FIG. 3 is a flowchart showing a process of adjusting the contrast of an image according to the inclination of a display screen in the image information display device of the embodiment. FIG. 4 is a flowchart showing a process of adjusting the contrast of an image according to the inclination of the display screen and the brightness of the surroundings in the image information display device of this embodiment. FIG. 5 is a configuration diagram of a communication conference system using an image information display device according to an embodiment of the present invention. FIG. 6 is a configuration diagram of a protocol stack configured on each communication conference terminal device of the communication conference system of this embodiment. 7 is a diagram showing a protocol sequence of conference communication by the communication conference terminal devices T1 and T2 of FIG. 6; FIG. 8 is a flowchart showing processing during conference communication between the communication conference terminal devices T1 and T2 in FIG. 6; [Description of Signs] 1: Image display section 2: Shaft section 3: Main body device 4: Display screen (window) 5: Writing pad section 6: Moving picture interface (I / F) section 7: Speaker 8: Microphone 9: Public Digital network (ISDN network) 10: Hard disk (HD) device 11: Keyboard 12: Facsimile device 13: RS232C cable 14: Touch pen 20: Video ram (VRAM) 21: Graphic controller 22: CPU 23: DMA controller 24: Interrupt controller 25: memory unit 26: serial interface (I / F) unit 27: LAPD 28: LABP 29: LAPF 30: media multiplexer unit 31: ISDN interface (I / F) unit 32: SCSI unit 34: modem unit 33: Serial interface (I / F) unit 36: LDC section 38: compression / decompression section 35: extension interface (I / F) section 37: RS232C interface (I / F) section 39: tilt angle detection section 40: contrast adjustment section 41: luminance sensor 42: shaft drive section 43 : System bus T1 to Tn: Communication conference terminal

Claims (1)

(57) [Claim 1] Means for switching the orientation of a display screen for displaying image information to a portrait or landscape orientation, and means for tilting the display screen at an arbitrary angle with respect to the horizontal Means for transmitting and receiving various types of information to and from another image information display device via a communication line, wherein the image information is transmitted to the other image information display device via the communication line. Means for notifying the orientation of the display screen and the tilt angle with respect to the horizontal of the display device, and when receiving the notification of the orientation of the display screen and the tilt angle with respect to the horizontal from the other image information display device via the communication line, Means for adjusting the display screen to the notified orientation and tilt angle, means for detecting the brightness around the display screen, and the means based on the brightness detected by the means and the notified tilt angle. table Means for adjusting contrast of an image displayed on the display screen.