JPH0317689A - Screen angle controller - Google Patents

Abstract

PURPOSE:To view a display screen in the best screen state at all times by detecting the arrangement relation between the display screen and a screen viewing person and adjusting the display screen automatically under fuzzy control to an easy-to-see angle for the viewing person. CONSTITUTION:An infrared-ray detecting circuit 46 is incorporated below the front surface of the liquid crystal screen 1 to detect infrared rays emitted by the viewing person M, detect the direction of the viewing person M from the incidence direction, and further detect the part where an infrared-ray area is circular, thereby deciding it as the head part. The right-left adjustment angle alphaof the liquid crystal screen 1 is obtained by conversion from the direction of the viewing person M and a servomotor M1 is driven according to the value to adjust the screen to the best right-left adjustment angle alpha in the right-left direction. Further, a distance measuring sensor and circuit 48 is incorporated in a control part main body 3 to measure the distance l to the head part and the elevation angle theta to the head part. The up-down adjustment angle beta of the liquid crystal screen 1, the sound volume of a speaker 4, etc., are calculated by fuzzy reasoning from said obtained values.

Description

[Detailed Description of the Invention] <<Field of the Invention>> This invention relates to a screen angle adjustment device that automatically adjusts the screen of a wall-mounted television or the like to an angle that is easy to view using fuzzy control. The invention detects the placement relationship between the display screen and the screen viewer, and uses fuzzy control to automatically adjust the display screen to an angle that is easy for the viewer to see! It was designed to make it look like this. 《Prior art and its problems》 Traditionally conceived wall-mounted TVs are literally hung on a vertical wall, so the screen is fixed in a vertical position parallel to the wall. It is also possible to tilt the screen in advance to an angle that is easy to view, but in any case, once the screen angle is set for the first time, wall-mounted TVs remain almost unchanged with little adjustment thereafter. It seems to be. On the other hand, people who watch TV have different heights due to individual differences.
Also, the viewing position is not constant, such as when looking close or far away. There are also various viewing positions, such as standing, sitting, and lying down. As a result, the angle of each viewer's line of sight relative to the TV screen is different, and if the angle of line of sight is significantly tilted from the vertical line of the screen, it will not only be difficult to see, but also
The problem with LCD screens is that they cannot be seen at all due to their polarization characteristics. 《Purpose of the invention》 This invention was made to solve the above-mentioned problems.The purpose of this invention is to solve the problem described above. An object of the present invention is to provide a screen angle adjustment device that allows the display screen to be continuously viewed in the optimum screen condition even when the display screen is in an optimum state. <Structure and Effects of the Invention> In order to achieve the above object, the present invention provides a detector for detecting the distance from the display screen to the screen viewer, and a detector for detecting the angle of the screen viewer's head with respect to the position of the display screen. The vessel and
From the position information of the display screen and screen viewer detected by both detectors, fuzzy inference using member simplification function is used to
It is characterized by being equipped with means for calculating the adjustment amount of the screen angle in order to make the display screen the most viewable angle for the viewer, and a screen angle drive mechanism that changes the screen angle based on the adjustment amount released in the summer. Suppose that In this way, the present invention detects the positional relationship between the display screen and the screen viewer, and uses fuzzy control to automatically adjust the display screen to an angle that is easy for the viewer to view. When this invention is applied to a television, even if the viewer is in various positions in front of the screen or constantly moving, the screen is always adjusted to the best angle, making it much easier to see than conventional fixed televisions. You can get Furthermore, because fuzzy reasoning is used in the control section that always controls the screen to the optimum screen angle, it is possible to simplify the control of the calculation section and increase processing speed. <<Description of Embodiments>> Next, embodiments of the present invention will be described based on the drawings. FIG. 1 is a side view illustrating vertical movement of the screen when the screen angle adjustment device according to the present invention is applied to a wall-mounted television. In the figure, a control unit main body 3 including an image receiving circuit section of a wall-mounted television is placed in a recess 6 formed in a wall surface 5, and a liquid crystal screen 1, which is a television screen, is placed above the main body 3.
is supported so that it can rotate vertically. A distance sensor 2 is provided at the lower end of the liquid crystal screen 1 to detect the distance to the television viewer M, the angle of the viewer's head, and the like. Further, on the front side of the main body 3, a speaker 4 is provided. In the figure, since the viewer M's head is at approximately the same level (h-ZR) as the distance sensor 2, the vertical adjustment angle β of the liquid crystal screen 1 is adjusted parallel to the vertical plane. Also, the volume of Subika 4 will be adjusted according to the distance to the detected viewer M!
All! It will be ff. Note that the scale on the left side of the drawing represents the height of the viewer M's head using a verbal expression (fuzzy label). FIG. 2 is a plan view illustrating the case where the angle of the wall-mounted television screen shown in FIG. 1 is adjusted in the left-right direction. In the figure, if the position of the viewer M deviates from the center line of the LCD screen 1, the LCD screen is rotated and adjusted at a left-right adjustment angle α corresponding to the angle of deviation, and the LCD screen The screen l is facing directly in front of you. FIG. 3 is a perspective view showing yet another embodiment of the television. In the figure, the liquid crystal screen 1 is the first one. 2, it is supported on the upper part of the control unit main body 3, and is configured so that the angle of the screen relative to the viewer M can be adjusted to the optimum state by adjusting the left and right adjustment angle α and the vertical adjustment angle β. Control unit body 3
has a built-in servo motor M1 for rotating the liquid crystal screen 1 in the left-right direction, and a servo motor M2 for rotating the liquid crystal screen 1 in the vertical direction.

An infrared detection circuit 46 (not shown) is built in the front lower part of the liquid crystal screen l, which detects the infrared rays emitted from the viewer M, and detects the direction of the viewer M from the direction of incidence of the infrared rays.
Furthermore, the infrared region detects a circular part and determines it to be the head. The horizontal adjustment angle α of the LCD screen 1 is converted from the direction of the viewer M obtained here, and the servo motor M1 is driven based on the value, thereby adjusting the left and right direction to the optimal horizontal adjustment angle α. It will be done. Also,
The control unit main body 3 has a built-in distance measurement sensor/circuit 48 (not shown), which emits ultrasonic waves toward the head of the viewer M detected by the infrared detection circuit 46, and from the reflected waves,
Measure the distance l to the head, and then measure the elevation angle (or depression angle) θ with respect to the head from the firing angle at this time. Now that the distance 2 to the head and the elevation angle θ are known, the horizontal distance d to the viewer M and the height h of the head are calculated by the following equation. d=fXcosθ...(1) h=ffiXsinθ...(2) From the values obtained in this way, the vertical adjustment angle β of the liquid crystal screen l
and the volume of the speaker 4 are calculated by fuzzy inference, which will be described later. FIG. 4 is a block diagram showing the horizontal control of the control section in these embodiments. The control section is mainly controlled by the CPU 41 executing a control program stored in the memory 42. An I/O interface 44 connected to the CPU 4 1 via a bus 43 receives a switch signal from an operation switch 45 for selecting automatic or manual screen angle adjustment, and a detection signal from an infrared detection circuit 46. are input respectively. Furthermore, when automatic adjustment is selected for the operation switch 45, an on signal is sent from the I/O interface 44 to the fuzzy controller 47, and fuzzy TFL logic calculations for vertical angle adjustment and volume adjustment are started. Ru. When manual is selected for the operation switch 45, the servo motor M2 can be manually operated to set an arbitrary vertical angle. In this case, the volume of the speaker 4 can also be manually adjusted.

When the I/O interface 44 outputs the left/right adjustment angle α based on the content detected by the infrared detection circuit 46 to the servo motor M1, the servo motor M1 performs a rotational operation. When the fuzzy controller 47 receives an on signal,
The arithmetic operation is started, and based on the distance d (x1) from the distance measurement sensor/circuit 48 to the viewer M, and the height h (x2) of the head, the calculation is performed for the viewer M in that state by fuzzy inference. Output about the optimal screen adjustment angle y
1 and an output y2 regarding the optimal volume of the speaker 4 is calculated and output to the power circuit 49. The power circuit 49 amplifies the output y1 and sends it to the servo motor M2 as a vertical angle β, and also amplifies the output y2 and sends it as a volume V to the volume adjustment section 60. The servo motor M2 rotates the liquid crystal screen l by an angle β in the vertical direction. The volume adjustment section 60 adjusts the volume of the speaker 4 to the level of the manually input volume V. FIG. 5 is a block diagram illustrating in more detail the processing operation of the fuzzy controller 47 shown in FIG. 4. In the figure, the viewer M output from the distance output circuit 5l
The distance d to is sent to the sample and hold circuit 52.

The height h of the head output from the height output circuit 53 is sent to the sample and hold circuit 54. Note that both the distance output circuit 51 and the height output circuit 53 are built into the distance measurement sensor/circuit 48. The sample and hold circuits 52 and 54 receive the input distance M
d and height h are held at predetermined intervals and sent to the fuzzy inference device 55 as signals X1 and X2.

The fuzzy inference device W55 calculates an optimal output value based on the fuzzy rule of the bronc 56 according to the goodness of fit (menhaship value) of the member-simbu functions of the input signals xi and x2, and uses the fuzzy inference to The output signals y1 and y2 obtained by fuzzing are sent to an amplifier 57,
Send to 58.

The fuzzy rule stored in block 56 uses the input values of distance d(xi) and height h(x2) as antecedents, and the values of vertical angle β(yl) and sound lv(y2) as antecedents. The consequent is the distance #d(xi) and the height h (x2
), the vertical angle β(yl) and the volume v(
y2) are defined respectively.

After amplifying the signal yl, the amplifier 57 sends it to the servo motor M2 as the vertical angle β.

The amplifier 58 amplifies the signal y2 and then sends it as a volume V to the sound t adjustment section 60.

FIG. 6 shows the human power Xi input to the fuzzy inference device 55.
, Figure a shows a member Shinobu function representing the degree of compatibility between the input x1 indicating the distance Md and each fuzzy rahel. Figure b shows the input χ2 indicating the height h and the member symbu function indicating the degree of compatibility between each fuzzy label. The horizontal axis of each of these figures shows specific calculated values.

Further, FIG. C is a member function related to the output y1 indicating the vertical angle β.

Figure d is a member symbu function regarding the output y2 indicating the volume V.

These menhaship functions are based on the specific settings of the device,
For example, the size of the display screen 1, the rotation range of the display screen 1, the capacity of the speaker 4, etc. are set to be most suitable.

FIG. 7 is a flowchart systematically showing the operation of the above embodiment. The operation will be explained below according to the flowchart. First, when the IT source is turned on, the infrared detection circuit 46 searches the front of the screen, detects the infrared rays emitted from the viewer M, detects the direction of the viewer M from the direction of incidence, and furthermore, the infrared region is circular. When a certain portion is detected, it is determined to be the head, and the servo motor M1 is activated to adjust the horizontal angle of the screen (step 71). If the head of viewer M cannot be detected here, the search is performed again (step 72, negative). Next, it is determined whether manual operation is selected for the operation switch 45 (stenop 73), and if manual operation is not selected, that is, automatic adjustment is selected (no of stenop 73), the distance i1ijl! An ultrasonic wave is emitted from the constant sensor/circuit 48 to the viewer M, and from the reflected wave,
The distance 2 to the head is measured, and the elevation angle θ relative to the head is measured from the firing angle at this time (step 74).

Here, the distance l to the head, the horizontal distance Hd from the elevation angle θ to the viewer M, and the height h of the head are expressed by the equation (1) described above.
Calculate using equation (2) (step 75). Then, by fuzzy reasoning using the distance d and height h obtained, the optimal screen angle β and volume ■ are determined and adjusted (step 76). After completing this series of processes, if the power switch has not been turned off (No in step 77), the process returns to the beginning and repeats. As a result, the position of the viewer M is constantly searched, and the optimal screen angle and volume are maintained.

These examples automatically adjust the screen angle of the wall-mounted TV to the optimal angle, and at the same time automatically adjust the volume, so if you watch TV while moving around the room, the TV will always be positioned almost directly in front of you. The volume is maintained at a comfortable level, neither too loud nor too quiet.

Furthermore, this screen angle adjustment device can be applied not only to wall-mounted televisions but also to ordinary televisions.

FIG. 8 is an explanatory diagram showing another embodiment.

In this embodiment, a screen angle adjustment device is applied to a display screen 82 of a financial terminal 81 such as an ATM or C/D. Since the display screen of the conventional terminal 81 of this kind is fixed, parallax with respect to the display screen 82 may occur depending on the physique of the customer M, and especially when the display screen is formed of liquid crystal, the deflection characteristics may be significant. , depending on the position of the customer's head, it may not be visible at all. In such cases, there is a usage problem in that the customer has to move his or her head to a viewing angle. Therefore, in this embodiment, a distance sensor 83 is provided in front of the display screen 82 to search for the head of the customer M.
By measuring the angle and distance, the distance d and height h are calculated in the same manner as in the above embodiment, and the optimal screen angle is determined by fuzzy reasoning.

As a result, even if there are variations in the physique of the customer M or the position of the customer M with respect to the terminal 8l, the screen angle is always adjusted to the optimum, making it easy to confirm the displayed content.

In each of the above embodiments, the vertical angle β of the screen is calculated based on the distance #d and the height h, but the distance l to the head, the elevation angle or depression angle θ of the head, and the actual screen angle It is also possible to similarly calculate the vertical angle β from .

[Brief explanation of the drawing]

FIG. 1 is a side view of a first embodiment in which a screen angle adjustment device according to the present invention is applied to a wall-mounted television, and FIG.
3 is a perspective view showing the second embodiment, FIG. 4 is a block diagram showing the power of the control section, FIG. 5 is a block diagram showing the structure of the fuzzy controller, and FIG. is a graph showing the membership functions set in the fuzzy inference device, FIG. 7 is a flowchart showing the operation, and FIG. 8 is an explanatory diagram showing the third embodiment. 1...LCD screen 2...Distance sensor 3...Control unit body 4...Speaker 5...Wall surface 6...Recess 4l...CPU 42...Memory 43...・Bus 44...1/○ Interface 45...Operation switch 46...Infrared detection circuit 47...Fuzzy controller 48...Distance measurement sensor/circuit 49...Power circuit 51...Distance output Circuit 52...Sample/hold circuit 53...Height output circuit 54...Sample/hold circuit 55...Fuzzy inference device 57 58...Amplifier 60...Volume adjustment unit 81...Finance Terminal 82... Display screen 83... Distance sensor Ml, M2... Servo motor d... Distance h... Height l... Distance ■... Volume α... Left/right adjustment angle β ... Vertical adjustment angle θ ... Elevation angle Fig. 6

Claims (1)

[Claims] 1. A detector that detects the distance from the display screen to the screen viewer; a detector that detects the angle of the screen viewer's head relative to the position of the display screen; and a display screen detected by both detectors. Using fuzzy inference using membership functions,
A screen angle drive mechanism that changes the screen angle based on the calculated adjustment amount, a means for calculating an adjustment amount of the screen angle to make the display screen the most viewable angle for a viewer, and a screen angle drive mechanism that changes the screen angle based on the calculated adjustment amount. Features a screen angle adjustment device.