JPH06189238A - Projection display device - Google Patents

Abstract

PURPOSE:To provide a projection display device which is capable of automatically adjusting the fine adjustment of the positioning, etc., of a projector for a screen. CONSTITUTION:This device is provided with a first light emitting element driving circuit 11 within a projector 10, a first light emitting element 18 where it drives, a first light receiving element 23 receiving the light from the light emitting element 18, plural of second light emitting elements 24 to 27 on a screen 20, a second light emitting element driving circuits 22 driving these successively, a light emitting circuit 21 switching the second light emitting element driving circuit 22 at the time of receiving the light receiving element 23, a first light receiving element 17 receiving light from the second light emitting elements 24 to 27, a distance arithmetic circuit 12 measuring the distance between the projector 10 and the screen 20 by the attaining time of light to these, a circuit 13 calculating the location of the projector 10 to the screen 20 from the information measured by this, and control means 14 to 16 controlling angles and screen distortions of the screen 20 to the projector 10 from this information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a front projection type display device.

[0002]

2. Description of the Related Art In recent years, as television screens have become larger,
Projection-type display devices using CRTs, liquid crystals, etc. have begun to attract attention from CRT direct-view display devices.

There are two types of projection-type display devices, a rear-projection type and a front-projection type. Generally, a small size of about 35 to 60 inches and many mainly used for home use are the rear-projection type. The front-projection type is the mainstream type that is used for business purposes and has a size of 70 to 200 inches.

By the way, the front projection type display device is composed of a projection unit for projecting image light, a so-called projector, and a screen unit which is emitted from the projector and projects the image.
Each has an independent shape.

FIG. 3 shows a basic structure of the front projection type display device generally used here.

In FIG. 3, the basic structure of the front projection type display device is provided by arranging three CRTs (projection tubes) 2 corresponding to RGB that play the role of a projection light source side by side. The projection unit 1 for projecting through the projection lens and the reflection type screen unit 4 for synthesizing and projecting the image light projected by the projection unit 1 serve as independent devices.

In such a system, the reflection type screen 3 used for it has no large projection space as a dead space on the back side of the screen and has a large degree of freedom in screen size. It was easy and inexpensive to install, and had the feature of enabling a large screen.

However, with respect to the installation of the projector 1, since the projector unit 1 and the screen unit 4 are independent from each other, the projector 1 is displaced each time the screen unit 4 is installed, and the screen is changed each time. It is necessary to make fine adjustments such as positioning of the projector 1 so as to be at right angles to the projector 3. For example, when the projector 1 is mounted on a ceiling or the like that is normally out of reach, the projector 1 is mounted on the screen 3. It was impossible to adjust the position.

[0009]

As described above, the front projection type projector is inconvenient because it requires fine adjustment such as positioning when installing the screen.

Therefore, the present invention has been made in view of such a problem, and eliminates the need for manual fine adjustment such as positioning of the front projection type projector when installing a screen, and projection capable of automatically adjusting this fine adjustment. The purpose is to provide a mold display device.

[0011]

A projection type display device according to the present invention is a projection type display device having a projector for projecting an image and a screen for displaying the image projected by the projector. A distance measuring means for measuring a distance between the projector and a predetermined portion of the screen and outputting first information regarding a distance between the projector and each portion of the screen; And a control means for processing information and controlling at least one of an angle of the projector with respect to the screen and a distortion state of a screen displayed on the screen.

A projection type display device according to the present invention is a front projection type display device comprising a projector and a screen for projecting an image projected by the projector, the projection type display device being provided at a predetermined position on the screen. A plurality of light emitting elements provided, a light emitting element drive circuit that sequentially drives the plurality of light emitting elements, and light provided from the plurality of light emitting elements that are provided in the projector and sequentially emit,
A distance calculation circuit that measures the distance between the projector and each position of the screen according to the arrival time of light from each light emitting element and outputs information regarding the distance, and the information from the distance calculation circuit causes the screen of the projector to move. A position calculation circuit for outputting position information, and a control means for automatically controlling at least one of an angle of the projector with respect to the screen and a screen distortion according to information from the position calculation circuit are provided.

A projection type display device according to a third aspect of the present invention is a front projection type display device comprising a projector and a screen for displaying an image projected by the projector, the front projection type display device being provided in the projector. A light emitting element drive circuit of No. 1, a first light emitting element which emits light by the light emitting element drive circuit, and the screen,
A first light receiving element that receives light from the first light emitting element, a plurality of second light emitting elements provided at predetermined positions on the screen, and a plurality of second light emitting elements are sequentially driven. A second light emitting element drive circuit, a switching circuit that operates the second light emitting element drive circuit when the first light receiving element receives light, and a plurality of second light emitting elements that are provided in the projector and sequentially emit light. Second light receiving element that receives light from the light emitting element, a distance calculation circuit that measures the distance between the projector and the screen based on the arrival time of light to these light reception elements, and information measured by this distance calculation circuit. According to the screen position calculation circuit for calculating the position of the screen with respect to the projector, and the information of the screen position calculation circuit, And characterized by comprising a control means for automatically controlling at least one of screen distortion.

[0014]

According to the present invention of claim 1, the distance between the projector and the predetermined portion of the screen when the screen is installed can be measured by using the distance measuring means for the projector and the screen. Further, by using the control means for controlling based on these information, the angle of the projector and the distortion state of the screen displayed on the screen can be automatically adjusted.

According to another aspect of the present invention, the light emitting element drive circuit provided on the screen sequentially emits light from the plurality of light emitting elements, receives the light sequentially emitted from these light emitting elements, and provides the distance provided to the projector. By using the arithmetic circuit, the distance between the projector and each position of the screen can be measured from the information on the arrival time of light from each light emitting element. Further, based on these information, the position information of the screen with respect to the projector is compared with the optimum position state by the position calculation circuit, and the information can be obtained so as to be in the optimum state, and the operation is also performed based on this information. By using the control means, the angle of the projector and the distortion state of the screen displayed on the screen can be automatically adjusted.

In a third aspect of the present invention, the first light emitting element drive circuit provided in the projector emits light from the first light emitting element, and the first light receiving element provided in the screen emits the first light. The light from the element is received, and the second light emitting element drive circuit operates by the switching circuit. As a result, the plurality of second light emitting elements provided at predetermined positions on the screen sequentially emit light, and the light sequentially emitted by the second light receiving elements provided on the projector is received. The distance between the projector and each position of the screen can be measured by using the distance calculation circuit provided in the projector from the information on the arrival time of the light. Further, based on these information, the position information of the screen with respect to the projector is compared with the optimum position state by the position calculation circuit, and the information can be obtained so as to be in the optimum state, and the operation is also performed based on this information. By using the control means, the angle of the projector and the distortion state of the screen displayed on the screen can be automatically adjusted.

[0017]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a projection type display device according to the present invention.

In FIG. 1, a front projection type display device is constituted by a projector 10 for projecting image light and a screen 20 for synthesizing and projecting the image light projected from the projector 10.

In the case of the present embodiment, for example, the projector 10 is installed on the ceiling 19 which is normally out of reach.

Further, the projector 10 is provided with a first light emitting element drive circuit 11, and a light emitting element 18 which emits light by the light emitting element drive circuit 11 is provided in the projector 1
It is formed by being attached to the lower part of the front surface (screen side) of the projection unit 0. A second light receiving element 17 for receiving the light emitted from the screen 20 is provided on the upper front surface of the projector 10, and a distance arithmetic processing circuit 12 connected to the second light receiving element 17 and the distance arithmetic processing circuit 12 are provided. Position calculating circuit 13 of the screen for supplying a signal and adjusting means 1 operated by the position calculating circuit 13 of the screen
It is composed of 4 ・ 15 ・ 16.

Further, the screen 20 is provided with a first light receiving element 23 for receiving the light emitted from the light emitting element 18 of the projector 10, which is provided on the screen 20 at the upper center of the outer periphery (on the side of the projector). The connected light emitting element switching circuit 21 and this light emitting element switching circuit 21
The second light emitting element drive circuit 22 which operates by the light emitting element and the light emitting elements 1st, 2nd, 3rd and 4th (reference numerals 24 to 27) which emit light according to the signal of the light emitting element drive circuit 22 are provided. There is.

Next, the operation of the front projection type display device having such a configuration will be described with reference to FIG. FIG. 2 is a block diagram showing an embodiment of the front projection type display device according to the present invention. In FIG. 2, it is assumed that the screen 20 is installed while the projector 10 is installed. Here, the distance calculation processing circuit 12 provided in the projector 10 is activated to start the operation, thereby outputting the drive signal f, and the drive signal f is used to output the first signal.
The light-emitting element drive circuit 11 is activated and the light-emitting element 18 emits light.

The light emitted from the light emitting element 18 is the first light receiving element 2 provided on the screen 20.
The light received by the light source 3 is switched to the switching signal a by the light emitting element switching circuit 21, and the switching signal a is supplied to the second light emitting element driving circuit 22 provided on the screen 20. There is. The light emitting element drive circuit 22 operates by the switching signal a and operates the four light emitting elements 24, 25, 2 provided on the screen 20.
It emits light in the order of 6 and 27.

The light thus sequentially emitted is received by the second light receiving element 17 provided in the projector 10, and after these optical signals are converted into electric signals, the second light receiving element 17 is provided. Is input to the distance calculation processing circuit 12 connected to.

In the distance calculation processing circuit 12, the time when the light emitted from the projector 10 reaches the projector 10 again via the screen 20 is calculated by these electric signals, and based on the information. The distances to the four corners of the projector 10 and the screen 20 are measured. Here, the delay time of the electric circuit is also judged and taken into consideration.

Next, the signal b obtained by the distance calculation processing circuit 12 (a signal indicating each of four distances) is output to the screen position calculation circuit 13.

The screen position calculation circuit 13 stores in advance information that the projector 10 is in the optimum state of the screen 20, and compares this information with the signal b obtained by the distance calculation processing circuit 12. It is possible to calculate the degree of positional deviation from the optimum state described above. Further, these calculated signals c, d, e are output to adjusting means 14, 15, 16 for automatically performing optimum positioning or screen distortion correction, respectively.

As the adjusting means, the signals c, d,
The rotating means 14 which operates based on the information of e, for example, which is operated by the signal c, is provided for projecting an optimum image in the horizontal direction, and is rotationally driven by the information obtained by the signal c. It can be moved to an optimum position by driving a motor or the like (not shown) of the means.

Further, the moving means 15 operated by the signal d is provided for projecting an optimum image in the vertical direction, and the information such as the motor of the rotary driving means is used in accordance with the information obtained by the signal d. It can be moved to an optimum position by driving (not shown).

Further, the distortion correcting means 16 operated by the signal e can correct the screen distortion by operating a distortion correcting circuit or the like (not shown).

According to such an embodiment, when the projector main body 10 and the screen 20 are provided with an arbitrary distance and the projector 10 and the screen 20 are installed, the projector 20 and the screen 20 are installed even if the positions of the screen 20 and the screen 20 are slightly different from each other. Positioning of 10 is automatically performed, and further screen distortion correction can be performed and an optimum image can be displayed on the screen 20. Further, although it is extremely difficult to install the projector 10 or adjust the positioning of the projector on a roof or the like that is normally out of reach, according to the present invention, the projector may be installed on a roof or the like that is out of reach. This makes it possible to obtain an optimum image by automatically performing positioning and the like even in such a state.

Although the four light emitting elements provided on the screen have been described in the above embodiments, the present invention is not limited to this, and even when a plurality of light emitting elements is used, the same as in the present embodiment. An accurate distance can be measured, the position of the projector and adjustment of screen distortion can be automatically adjusted, and an optimum image can be displayed on a large or small screen or the like.

Further, in the present embodiment, the operation performed by one operation or one signal is explained in the block diagram of FIG. 2, but the present invention is not limited to this, and the projector 10 is in the most optimal state. It is possible to correct the position shift and screen distortion correction while operating until it becomes.

[0034]

According to the present invention described above, it is possible to perform automatic adjustments without manually performing fine adjustments such as positioning of the front projection type projector when installing a screen and screen distortion correction. It is possible to display such an image, and it is possible to install the front projection type projector on a ceiling or the like that is normally out of reach.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a projection type display device according to the present invention.

FIG. 2 is a block diagram showing an embodiment of the projection type display device of FIG.

FIG. 3 is a side view showing the structure of a conventional front projection display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Projector 11 ... 1st light emitting element drive circuit 12 ... Distance arithmetic processing circuit 13 ... Screen position calculation circuit 14-16 ... Adjusting means 17 ... 2nd light receiving element 18 ... Light emitting element 20 ... Screen 21 ... Light emitting element switching circuit 22 Second light emitting element drive circuit 23 First light receiving element 24 First light emitting element 25 Second light emitting element 26 Third light emitting element 27 Fourth light emitting element

Claims (3)

[Claims] 1. A projection type display device having a projector for projecting an image and a screen for displaying the image projected by the projector, wherein a distance between the projector and a predetermined portion of the screen is measured. A distance measuring means for outputting first information on a distance between the projector and each part of the screen; and a first angle information from the distance measuring means for processing the angle of the projector with respect to the screen and a screen displayed on the screen. A projection-type display device, comprising: a control unit that controls at least one of the distorted states. 2. A front projection type display device comprising a projector and a screen for projecting an image projected by the projector, comprising: a plurality of light emitting elements provided at predetermined positions on the screen; A light-emitting element drive circuit for sequentially driving light-emitting elements, light is received from the plurality of light-emitting elements that are sequentially provided in the projector, and each position of the projector and the screen is determined by the arrival time of light from each light-emitting element. And a distance calculation circuit that measures the distance and outputs information related to the distance, a position calculation circuit that outputs position information of the screen with respect to the projector based on the information from the distance calculation circuit, and the position calculation circuit based on the information of the position calculation circuit. Control for automatically controlling at least one of the angle of the projector with respect to the screen and the screen distortion A projection-type display device comprising: 3. A front projection type display device comprising a projector and a screen for projecting an image projected by the projector, comprising: a first light emitting element drive circuit provided in the projector; and a light emitting element drive circuit. A first light emitting element that emits light by a circuit; a first light receiving element that is provided on the screen and receives light from the first light emitting element; and a plurality of second light emitting elements that are provided at predetermined positions on the screen. A light emitting element, a second light emitting element drive circuit for sequentially driving the plurality of second light emitting elements, and a switching for operating the second light emitting element drive circuit when the first light receiving element receives light. A circuit, a second light receiving element that is provided in the projector and receives light from the plurality of second light emitting elements that sequentially emit light, and a light arrival time of these light receiving elements. A distance calculation circuit for measuring the distance between the projector and the screen, a screen position calculation circuit for calculating the position of the screen with respect to the projector based on the information measured by the distance calculation circuit, and information for the screen position calculation circuit, A projection type display device comprising: a control unit that automatically controls at least one of an angle of the projector with respect to the screen and a screen distortion.