JP2598557B2 - LCD projector focus adjustment system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focus adjustment system for a liquid crystal projector that can easily adjust focus on a screen.

[Prior Art] As shown in FIG. 4, a conventional liquid crystal projector P 'is a video signal processing means 1 for reproducing an image on a screen 6, a projection means 2 for emitting video light, and an enlarged image light. It does not include a projection lens 3 'for projecting the image on the screen 6, and does not incorporate a dedicated device for adjusting the focus.

Therefore, the video signal processing means 1 is sent to the projection means 2 to emit video light, and the focus adjustment is performed by turning the projection lens 3 'while watching the screen 6 on which the video light is enlarged and projected.

[Problem to be Solved by the Invention] As described in the preceding section, in the conventional liquid crystal projector P ′,
Since there is no dedicated system for focus adjustment,
The user was operating the projection lens while watching the image projected on the screen.

Therefore, it is inaccurate to determine whether the focus on the screen is in focus, and it has been difficult to view the screen in the best condition.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, a video signal processing unit for processing an input video signal, and a liquid crystal panel using a video signal output from the video signal processing unit A projection unit that emits image light by driving the projection unit; an enlargement projection unit that enlarges the image light emitted from the projection unit and projects the image light on a screen; and the image signal processing unit, the projection unit, and the projection unit on the screen. In a focus adjustment system of a liquid crystal projector having a pattern signal output unit for outputting a video signal for projecting a focus adjustment pattern through an enlargement projection unit, the lens in the enlargement projection unit is electrically operated by operating a focus adjustment switch. While operating the focus adjustment switch. It is characterized in that the pattern signal output means is operated in conjunction with it to project a focus adjustment pattern.

A video signal processing unit that processes the input video signal; a projection unit that emits video light by driving a liquid crystal panel with the video signal output from the video signal processing unit; Magnifying projection means for magnifying the image light and projecting it on a screen, and a pattern signal for outputting a video signal for projecting a focus adjustment pattern on the screen through the video signal processing means, the projecting means and the magnifying projection means In a focus adjustment system of a liquid crystal projector having an output unit, a touch sensor is provided in the enlargement projection unit, and a video signal is output from the pattern signal output unit based on a detection signal of the touch sensor to project a focus adjustment pattern. It is characterized by doing so.

[Operation] In FIG. 1 showing the first embodiment, when projecting an image on a screen 6, the pattern signal output means 4 dedicated to focus adjustment is interlocked with the adjustment switch 5 of the electric lens 3 so that the screen can be projected. The focus adjustment pattern 7 is displayed on 6, and the operator operates the electric lens 3 with the adjustment switch 5 to adjust the focus while watching the displayed still image of the focus adjustment pattern 7.

In FIG. 3 showing the second embodiment, when the liquid crystal projector P is turned on, if a video signal is input to the video signal processing means 1, the video is displayed on the screen 6.
(See FIG. 2).

When the user wants to adjust the focus while watching the image projected on the screen 6, touching the magnifying projection means 3,
A still image of the focus adjustment pattern 7 is displayed on the screen 6.

The focus is adjusted while watching the focus adjustment pattern 7 projected on the screen 6.

[Embodiment] Next, two embodiments of a focus adjustment system for a liquid crystal projector according to the present invention will be described with reference to FIGS.
This will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a first embodiment of a focus adjustment system for a liquid crystal projector according to the present invention.

In FIG. 1, a liquid crystal projector P includes a video signal processing unit 1 for reproducing an input video signal into a video, a projection unit 2 for emitting video light on a liquid crystal panel,
A motorized lens as the magnifying projection means 3 for enlarging the image light and projecting it on the screen 6, and a focus adjustment pattern 7
It comprises a pattern generator as pattern signal output means 4 for outputting a video signal (see FIG. 2) and an adjustment switch 5 for a focus operation.

The video signal processing means 1 processes a video signal input to the liquid crystal projector P by a YC separation circuit, a luminance signal amplification circuit, a color signal amplification / demodulation circuit, a color synchronization circuit, a matrix circuit, a video output circuit, and the like, and projects the image signal. Output to means 2.

The projection means 2 separates the light emitted from the light source into the three primary colors R, G, and B by an optical system, transmits the liquid through each liquid crystal panel, combines them again, and outputs the combined light as image light to the enlarged projection means 3.

The magnifying and projecting means 3 magnifies the image light incident from the projecting means 2 and projects it on a screen 6.

Screen 6 projected by this liquid crystal projector P
The adjustment of the focus of the above image is performed by operating the electric lens 3.

The operation of the motorized lens 3 is performed by turning the adjustment switch 5 for focus adjustment. In conjunction with the operation of the adjustment switch 5, a focus adjustment pattern signal is output by the pattern generator 4 dedicated to focus adjustment, and this is output to the screen. 6 on the screen.

At this time, an image of the focus adjustment pattern 7 as shown in FIG. 2 is projected onto the image 8 based on the image signal on the screen 6.

By turning the adjustment switch 5 while watching the image of the focus adjustment pattern 7, the focus is adjusted on the screen 6.

FIG. 3 is a block diagram showing a configuration and a signal flow of a liquid crystal projector in a second embodiment of the focus adjustment system for the liquid crystal projector according to the present invention.

In FIG. 3, a liquid crystal projector P includes a video signal processing means 1 for demodulating an input video signal, a projection means 2 for emitting video light, and a magnifying projection means 3 for expanding the video light and projecting it on a screen. And pattern signal output means 4.

The video signal processing means 1 demodulates a video signal input to the liquid crystal projector P by a YC separation circuit, a luminance signal amplification circuit, a color signal amplification / demodulation circuit, a color synchronization circuit, a matrix circuit, a video output circuit, and the like. Output to the projection means 2.

The projection means 2 for emitting image light includes a power supply circuit 21, a lamp stabilizer 22, a light source lamp 23, and a projector main body.
It consists of 24.

The projector main body 24 contains liquid crystal panels 25R, 25G, and 25B of the three primary colors R, G, and B, and an optical system (not shown).

Magnifying projection means 3 for magnifying and projecting image light on the screen
Is a projection lens arranged on the front surface of the projector main body 24 of the projection means 2.

The pattern signal output means 4 includes a touch sensor 41 attached to the projection lens of the magnifying projection means 3 and a touch sensor
It comprises a microcomputer circuit 42 for inputting a detection signal from 41, and a focus pattern synthesizing circuit 43 for outputting a focus signal from the microcomputer circuit 42 to the video signal processing means 1.

The pattern signal output from the focus pattern synthesis circuit 43 is output to the video signal processing means 1.

When the power of the liquid crystal projector P shown in FIG. 3 is turned on, the image is displayed on the screen 6 when a video signal is input, or only white is displayed on the screen 6 when there is no signal.

Then, when it is desired to adjust the focus, when the user touches the magnifying projection means 3, the touch sensor 41 attached to the magnifying projection means 3 senses and operates the microcomputer circuit 42. The microcomputer circuit 42 and the pattern synthesizing circuit for focusing
With 43, a still image of the focus adjustment pattern 7 is projected on the screen 6 as shown in FIG.

While touching the enlarged projection means 3, the screen 6
A still image of the focus adjustment pattern 7 is shown above. Even if you release your hand from the magnifying projection means 3,
The still image of the focus adjustment pattern 7 is projected on the screen 6 until the second has elapsed.

Then, while watching the image of the focus adjustment pattern 7 projected on the screen 6, the focus on the screen 6 is adjusted by operating the magnifying projection means 3.

[Effects of the Invention] As described above, in the focus adjustment system for a liquid crystal projector according to the present invention, the focus adjustment switch is operated or the focus is adjusted irrespective of whether or not a video signal is projected on the screen. A still image of a focus adjustment pattern serving as a reference base for focus can be automatically displayed on a screen by an operation of touching a touch sensor provided on the enlargement projection unit.

The focus can be adjusted while watching the still image projected on the screen.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a focus adjustment pattern projection system of a liquid crystal projector according to the present invention, FIG. 2 is a front view of a screen on which a still image of the focus adjustment pattern is projected, and FIG. FIG. 4 is a block diagram showing a configuration and a signal flow of a liquid crystal projector in a second embodiment, and FIG. 4 is a schematic configuration diagram of a conventional liquid crystal projector. P ... LCD projector 1 ... Video signal processing means 2 ... Projection means 3 ... Enlargement projection means 4 ... Pattern signal output means 5 ... Adjustment switch 7 ... Focus adjustment pattern 41 ... Touch sensor 42 ... Microcomputer Circuit 43 …… Focus pattern synthesis circuit

Claims (2)

(57) [Claims] 1. A video signal processing means for processing an input video signal, a projection means for emitting a video light by driving a liquid crystal panel with a video signal output from the video signal processing means, and the projection means An enlargement projection unit for enlarging image light emitted from the projector and projecting the image light on a screen, and outputting a video signal for projecting a focus adjustment pattern on the screen through the image signal processing unit, the projection unit, and the enlargement projection unit. In a focus adjustment system of a liquid crystal projector provided with a pattern signal output unit, the lens in the magnifying projection unit is electrically operated to operate the lens by operating a focus adjustment switch, and interlocked with the operation of the focus adjustment switch. Operating the pattern signal output means to adjust the focus LCD projector focus adjustment system which is characterized in that so as to project the over down. 2. A video signal processing means for processing an input video signal; a projection means for emitting a video light by driving a liquid crystal panel with the video signal output from the video signal processing means; An enlargement projection unit for enlarging image light emitted from the projector and projecting the image light on a screen, and outputting a video signal for projecting a focus adjustment pattern on the screen through the image signal processing unit, the projection unit, and the enlargement projection unit. In a focus adjustment system of a liquid crystal projector provided with a pattern signal output signal to be provided, a touch sensor is provided in the magnifying projection means, and a video signal is output from the pattern signal output means based on a detection signal of the touch sensor for focus adjustment. Focus on LCD projectors characterized by projecting patterns Settling system.