JP2003009040A - LCD projector display system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide means for automatically setting a predetermined display screen position or size when a size or position of a projection screen is changed in a liquid crystal projector display system. SOLUTION: An image signal is projected on a projection screen 10 by a liquid crystal projector to display an image. On the projection screen 10, an image from a personal computer, a TV tuner, or the like is projected and displayed as a display screen 10a by a liquid crystal projector. At the end of the projection screen 10, there are provided projection light detection devices 21a and 21b that detect light rays projected from the liquid crystal projector and transmit a light reception signal indicating the presence or absence of the projection light to the liquid crystal projector. The liquid crystal projector receives light receiving signals from the projection light detecting devices 21a and 21b, and adjusts the display screen on the projection screen to a predetermined position and size based on the light receiving signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector display system for automatically adjusting and displaying the position and size of a display screen on a projection screen.

[0002]

2. Description of the Related Art A liquid crystal projector display system in which a video signal from a personal computer, a TV tuner or the like is projected and displayed on a projection screen by a liquid crystal projector is widely used because it can be moved and installed on a small and lightweight device to display a large screen. It started to be done. In this liquid crystal projector display system, each time a new projection screen or liquid crystal projector is installed, it is necessary to adjust the position and size of the display screen on the projection screen. As an example of adjusting the position and size of a conventional display image, a control signal for changing the position and size of the display screen is issued from the operation panel or remote control of the liquid crystal projector, and the control unit provided in the liquid crystal projector is used. They used electric means to adjust the length of the legs and drive an electric zoom lens. However, with such means, it is necessary to manually set the position and size of the display screen every time the liquid crystal projector display system is installed, which not only takes time and labor but also requires complicated work.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a liquid crystal projector display system, when a size or a position of a projection screen or a position of the liquid crystal projector is changed, a predetermined value is automatically set. It is an object of the present invention to provide means capable of setting the position and size of a display screen.

[0004]

A liquid crystal projector including a video signal processing circuit, a liquid crystal panel and an optical system, and a projection screen are provided, and an input video signal is processed by the video signal processing circuit to drive the liquid crystal panel, In a liquid crystal projector display system in which light intensity modulation is performed by a liquid crystal panel and an optical system to display an image by projecting it on a projection screen, a light receiving unit that detects the projection light from the liquid crystal projector and a light receiving that indicates the presence or absence of the detected projection light A projection light detection device including a control unit for controlling the transmission unit by a signal and the transmission unit for transmitting a signal corresponding to the received light signal is provided at the end of the projection screen, while the liquid crystal projector is provided with the projection light detection device. A receiver is provided to receive outgoing signals,
By adjusting the position and / or size of the display screen on the projection screen according to the reception signal received by the receiving unit, a predetermined size can be set at a predetermined position on the projection screen regardless of the size or position change of the projection screen. A liquid crystal projector display system adapted to project a display screen.

The projection light detecting device is a liquid crystal projector display system having two projection light detecting devices provided at diagonal end portions of the projection screen.

The projection light detecting device comprises a liquid crystal projector comprising two light receiving portions provided at diagonal end portions of the projection screen and one transmitting portion for transmitting a signal corresponding to the light receiving signal to the liquid crystal projector. Display system.

The liquid crystal projector has a function of adjusting the position and size of the display screen by a control signal from a remote controller, and the projection light detection device corresponds to the projection light received by the two light receiving portions. A liquid crystal projector display system in which a position and a size of a display screen are judged from a received signal and a control signal which is the same as a control signal for adjusting the position or the size from a remote controller is transmitted.

A liquid crystal projector display system is provided in which the projection light detecting device is provided with a light emitting portion which emits light toward the outside in response to the light receiving signal, and the presence or absence of projection light detected by the light receiving portion is notified to the outside by light emission.

A liquid crystal projector display system is provided, in which the projection light detecting device is provided with a speaker that emits sound toward the outside in response to the light reception signal, and the presence or absence of projection light detected by the light receiving portion is notified to the outside by sound.

The liquid crystal projector is provided with an image generation section for generating an image signal representing the presence or absence of the projection light detected by the light receiving section, and the projection signal detected by the light receiving section is projected by projecting the image signal on the projection screen. A liquid crystal projector display system that informs the presence / absence to the outside.

A liquid crystal projector in which a timer is provided in the projection light detection device and a function is provided to automatically turn off the power of the projection light detection device after the time required for adjusting the position and size of the display screen on the projection screen has elapsed. Display system.

On one side of the projection light detecting device, there is provided a hooking bar having a hook part for hooking on the end of the projection screen,
A liquid crystal projector display system that is suspended from the upper end of the projection screen.

The hooking rod is a liquid crystal projector display system comprising a plurality of hollow rods each having a different inner diameter depending on the wall thickness and capable of being sequentially inserted, and a locking portion for locking the hollow rods at a predetermined position.

A liquid crystal projector display system in which a holding portion for holding the end portion of the projection screen is provided in the projection light detecting device, and the projection light detecting device is placed by being held by the holding portion at a predetermined position on the projection screen. And

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of a liquid crystal projector display system. A liquid crystal projector 20 including a video signal processing circuit, a liquid crystal panel, an optical system, and the like.
The video signal input from a personal computer or a TV tuner is processed by a video signal processing circuit to drive the liquid crystal panel, the driven liquid crystal panel and the optical system perform light intensity modulation, and the result is projected on the projection screen 10. The image is displayed. FIG. 2 is a front view of a projection screen for explaining the concept of the liquid crystal projector display system according to the present invention. On the projection screen 10, an image from a personal computer or a TV tuner is displayed on the display screen 1 by a liquid crystal projector.
It is projected and displayed as 0a. At the end of the projection screen 10, projection light detection devices 21a and 21b that detect a light beam projected from the liquid crystal projector 20 and send a light reception signal indicating the presence or absence of the projection light to the liquid crystal projector 20 are provided. In the liquid crystal projector 20, the projection light detection device 21
The transmission signals from a and 21b are received, and the received signal adjusts the display screen on the projection screen to a predetermined position and size.

FIG. 3 is a block diagram of essential parts of a projection light detecting apparatus showing an embodiment of a liquid crystal projector display system according to the present invention. The projection light detection devices 21a and 21b are
Two projection light detection devices 21a are provided at diagonal end portions of the projection screen 10, a first projection light detection device 21a is provided at the upper left of the projection screen 10, and a second projection light detection device 21b is provided at the lower right of the projection screen 10. Install (see Figure 2). First projection light detection device 21a and second projection light detection device 21b
Are a light receiving section 31 made of CdS, PbS, a photodiode, etc., and a control section 32 made of MPU, etc.
And a light emitting portion 33 including an LED and the like. Light receiving part 31
Then, the presence or absence of the projection light S1 from the liquid crystal projector 20 is detected. In the control unit 32, the first projection light detection device 21 receives the light reception signal indicating the presence or absence of the projection light detected by the light reception unit 31.
The light emitting unit 33 (which constitutes a transmitting unit) is driven and emitted by a signal to which an address signal indicating either a or the second projection light detection device 21b is added. The light-receiving unit that receives the remote control signal of the liquid crystal projector 20 receives the transmission signal S2 transmitted from the light emitting unit 33, and the control unit of the liquid crystal projector 20 adjusts the position and size of the projection screen as follows.

First, when neither the first projection light detection device 21a nor the second projection light detection device 21b receives the projection light, it is determined that the projection screen is smaller than a predetermined size and the electric zoom lens is zoomed up. Drive signal is transmitted, the display screen is enlarged, and the screen size at which the first projection light detection device 21a and the second projection light detection device 21b simultaneously receive projection light is fixed. When the projection light is received by both the first projection light detection device 21a and the second projection light detection device 21b, a zoom-down drive signal is transmitted to the electric zoom lens assuming that the projection screen is larger than a predetermined value. Then, the display screen is made small, and once the first projection light detection device 21a and the second projection light detection device 21b are set in a state where they do not receive projection light, the same operation as described above is performed on the electric zoom lens. The drive signal for zooming up is transmitted, the display screen is enlarged, and the first projection light detection device 21
The screen size at which a and the second projection light detection device 21b simultaneously receive the projection light is fixed. Also, when the above-mentioned electric zoom lens is zoomed up to increase its size, or when the electric zoom lens is zoomed down to decrease its size, one of the projection light detection devices receives the projection light. On the other hand, when light is received by the projection light detection device, it is judged that the projection position of the display screen is displaced and the optical axis is adjusted or the zoom lens is adjusted as shown in FIG. After changing the projection position and size, as described above, the electric zoom lens is zoomed down and then zoomed up to enlarge the display screen, and the first projection light detection device 21a and the second projection light detection device 21b are displayed.
Fixes to the screen size at which the projected light was received at the same time. Then, finally, adjustment is performed so that the upper left end of the projection screen 10a on the projection screen 10 is detected by the first light receiving unit 21a and the lower right end is detected by the second light receiving unit 21b. .

FIG. 4 is a front view of a projection screen for explaining the concept of another embodiment of the liquid crystal projector display system according to the present invention. FIG. 5 is a block diagram of a main part of a projection light detection apparatus showing another embodiment of the liquid crystal projector display system according to the present invention. As the projection light detecting device, there are two light receiving units, a first light receiving unit 41a installed in the upper left of the projection screen 10 and a second light receiving unit 41b installed in the lower right.
Control unit 5 for transmitting to the liquid crystal projector a signal corresponding to the light receiving signals from the respective light receiving units 41a and 41b.
2 and a light emitting unit 53. In the first light receiving section 41a, the projection light S at the upper left of the projection screen 10a is
1a is detected. The second light receiving section 41b detects the projection light S1b at the lower right of the projection screen. The control unit 52 in the transmission unit 42 includes the first light receiving unit 41 a and the second light receiving unit 41.
A control signal S52 for adjusting the position and size of the projection screen is created from the projection light detected in each of b, and the light emitting unit 53 is driven and transmitted to the liquid crystal projector 20. In the liquid crystal projector 20, the control signal S52 adjusts the display screen on the projection screen to a predetermined position and size.

Although a unique code can be set as the control signal S52, the liquid crystal projector generally has a function of adjusting the position and size of the display screen by a control signal from a remote controller. Therefore, as the control signal S52, the control unit 52 of the transmitting unit 42
It is also possible to create the same control signal as the control signal for adjusting the position or size from the remote controller. Then, the light emitting portion 53 is driven by the signal to transmit to the liquid crystal projector 20. The liquid crystal projector 20 can receive the control signal from the remote controller in exactly the same manner and can adjust the position or size of the display screen 10a. As a result, it is possible to automatically adjust the size and position of the projection screen without modifying the conventional liquid crystal projector having the remote control function.

Each of the first projection light detection device 21a and the second projection light detection device 21b has a light emitting portion including an LED or the like which is controlled by the control portion 32 and is turned on when the light receiving portion 31 does not detect the projection light. 34 is provided (see FIGS. 2 and 3). As a result, when the projection light does not reach the first projection light detection device 21a or the second projection light detection device 21b, the light emitting unit 34 emits light and the deviation of the projection screen 21b, It can be seen that further adjustment is necessary. Similarly, the first projection light detection device 21a and the second projection light detection device 21b each have a speaker 3 driven by the control unit 32 when the light reception unit 31 does not detect projection light.
5 is provided. Thereby, the first projection light detection device 21a
Alternatively, when the projection light does not reach the second projection light detection device 21b, the speaker 35 sounds and it is understood that further adjustment is necessary. Furthermore, in the liquid crystal projector 20, the light reception signal S2 from the projection light detection devices 21a and 21b is received.
Therefore, an image generation unit for displaying the presence or absence of received projection light is provided (not shown). By projecting and displaying the image on the projection screen 10, it can be easily understood from the outside that adjustment is necessary due to the deviation of the projection screen 10a or the like.

A timer 36 is provided in each of the projection light detectors 21a and 21b (see FIG. 3). When installing the liquid crystal projector display system, the projection light detection device 2 is manually operated.
1a and 21b are turned on, and the projection screen 10
Install it in the specified position above. Projection light detectors 21a, 2
In the control unit 32 of 1b, the projection screen 1 is displayed on the timer 36.
The time required to adjust the position and size of the display screen 10a on the display screen 0 is set. Then, in response to an interrupt signal from the timer 36, the control unit 32 automatically turns off the power sources of the projection light detection devices 21a and 21b. As a result, the power consumption of the projection light detection devices 21a and 21b suitable for battery driving can be reduced.

FIG. 6 is a side view of a locking portion of a projection light detecting apparatus showing another embodiment of the liquid crystal projector display system according to the present invention. The locking portion for locking the projection light detection devices 21a and 21b to the projection screen 10 has the projection light detection devices 21a and 21b attached to one end thereof and the hook portion 61d which is hooked to the upper end of the projection screen 10 at the other end. The projection light detectors 21a and 21b are configured to be suspended from the upper end of the projection screen 10 by being configured by a hooking rod 61 provided with. The latching rod 61 is composed of a plurality of hollow rods 61a, 61b, 61c, each of which has an inner diameter different by the wall thickness and can be sequentially fitted. The hollow rods 61a, 61b, 61c are sequentially fitted and inserted, and then a locking portion 62 is locked at a predetermined position by screwing.
a and 62b are provided. Alternatively, the projection light detection device 21a,
21b is provided with a holding portion (not shown) made of a clip having a shape similar to that of clothespins for holding the end portion of the projection screen 10. Thereby, the projection light detection device 21a,
21b or the light receiving portions 41a and 41b are connected to the projection screen 1
It can be sandwiched and installed at a predetermined position on the zero.

[0023]

As described above, the liquid crystal panel is provided with the video signal processing circuit, the liquid crystal projector including the liquid crystal panel and the optical system, and the projection screen, and the input video signal is processed by the video signal processing circuit. In a liquid crystal projector display system that is driven to perform light intensity modulation with a liquid crystal panel and an optical system and projects an image on a projection screen to display an image, a light receiving unit that detects the projected light from the liquid crystal projector and the presence or absence of the detected projected light A projection light detection device including a control unit that controls the transmission unit by a light reception signal that represents the light reception signal and a transmission unit that transmits a signal corresponding to the reception light signal is provided at the end of the projection screen, while the projection light detection device is provided in the liquid crystal projector A receiving unit that receives the transmission signal from the device is provided, and the display screen on the projection screen is displayed by the receiving signal received by the receiving unit. By adjusting the position and / or size, the size and position of the projection screen can be adjusted by projecting a display screen of a specified size at a specified position on the projection screen regardless of the size or position of the projection screen. It is possible to automatically set the display screen to a predetermined position or size when the value is changed or when the position of the liquid crystal projector is changed.

[Brief description of drawings]

FIG. 1 is a schematic side view of a liquid crystal projector display system.

FIG. 2 is a front view of a projection screen for explaining the concept of the liquid crystal projector display system according to the present invention.

FIG. 3 is a block diagram of a main part of a projection light detection apparatus showing an embodiment of a liquid crystal projector display system according to the present invention.

FIG. 4 is a front view of a projection screen for explaining the concept of another embodiment of the liquid crystal projector display system according to the present invention.

FIG. 5 is a block diagram of essential parts of a projection light detection apparatus showing another embodiment of the liquid crystal projector display system according to the present invention.

FIG. 6 is a side view of a locking portion of a projection light detection apparatus showing another embodiment of the liquid crystal projector display system according to the present invention.

[Explanation of symbols]

10 Projection screen 10a display screen 20 LCD projector 21a, 21b Projection light detection device 31 Light receiving part 32 control unit 33, 34 light emitting unit 35 speakers 36 timer 41a, 41b Light receiving part 42 Transmitter 52 control unit 53 Light emitting part 61 Hook bar S1, S1a, S1b Projected light S2 light receiving signal S52 control signal

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Claims (11)

[Claims] 1. A liquid crystal projector comprising a video signal processing circuit, a liquid crystal panel, an optical system and the like, and a projection screen, wherein an input video signal is processed by the video signal processing circuit to drive the liquid crystal panel. In a liquid crystal projector display system in which light intensity modulation is performed by a system to display an image by projecting it on a projection screen, a light receiving unit that detects the projection light from the liquid crystal projector and a transmission unit that uses a light reception signal that indicates the presence or absence of the detected projection light A projection light detection device including a control unit for controlling the light reception signal and the transmission unit for transmitting a signal corresponding to the received light signal is provided at the end of the projection screen, while the liquid crystal projector receives the transmission signal from the projection light detection device. A receiving unit is provided, and the position or / and size of the display screen on the projection screen is adjusted according to the received signal received by the receiving unit. A liquid crystal projector display system characterized in that by adjusting the height, a display screen of a predetermined size is projected at a predetermined position on the projection screen regardless of changes in the size or position of the projection screen. 2. The liquid crystal projector display system according to claim 1, wherein two projection light detecting devices are provided at diagonal end portions of the projection screen. 3. The projection light detection device comprises two light receiving portions provided at diagonal end portions of the projection screen, and one transmitting portion for transmitting a signal corresponding to the light receiving signal to the liquid crystal projector. The liquid crystal projector display system according to claim 1, wherein: 4. The liquid crystal projector is provided with a function of adjusting the position and size of a display screen in accordance with a control signal from a remote controller, and the projection light detection device includes
The position and size of the display screen are judged from the received signal corresponding to the projection light received by each light receiving part, and the same control signal as the control signal for adjusting the position or size from the remote control is transmitted. The liquid crystal projector display system according to claim 3, wherein 5. The projection light detecting device is provided with a light emitting portion that emits light toward the outside in response to the received light signal, and the presence or absence of projection light detected by the light receiving portion is notified to the outside by light emission. The liquid crystal projector display system according to claim 1. 6. The projection light detection device is provided with a speaker that emits sound toward the outside in response to the received light signal, and the presence or absence of projection light detected by the light receiving portion is notified to the outside by sound. The liquid crystal projector display system according to claim 1. 7. The liquid crystal projector is provided with an image generation unit for generating an image signal representing the presence or absence of projection light detected by the light receiving unit, and projection is performed by projecting the image signal on a projection screen to detect the light by the light receiving unit. The liquid crystal projector display system according to claim 1, wherein the presence or absence of light is notified to the outside. 8. The projection light detecting device is provided with a timer, and a function is provided to automatically turn off the power of the projection light detecting device after a lapse of time required for adjusting the position and size of the display screen on the projection screen. The liquid crystal projector display system according to claim 1, wherein the display system is a liquid crystal projector display system. 9. A hooking rod having a hook for hooking to an end of the projection screen is provided on one side of the projection light detecting device, and is suspended from the upper end of the projection screen. The liquid crystal projector display system according to claim 1. 10. The hooking rod comprises a plurality of hollow rods each having a different inner diameter depending on the wall thickness and capable of being successively inserted, and a locking portion for locking the hollow rods at a predetermined position. The liquid crystal projector display system according to claim 9. 11. The projection light detecting device is provided with a sandwiching portion for sandwiching an end portion of the projection screen, and the sandwiching portion sandwiches the projection light detecting device at a predetermined position to install the projection light detecting device. 9. A liquid crystal projector display system according to claim 1, which is characterized.