JPH0752330B2 - Video projector equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a video projector device, and more particularly to a projection change corresponding to the device arrangement in a projection type projector.

[Prior Art] As shown in FIG. 8, there are two types of video projector devices, a stationary type and a ceiling-mounted type. In FIG. 1A, a stationary type is shown, and an image is projected on a screen 14 by a projector 12 which is placed on a predetermined table 10 or the like. Same figure (B)
In the figure, a ceiling-mounted type is shown, and an image is projected on a screen 20 by a projector 18 suspended on a ceiling 16.

The stationary projector 12 and the ceiling-mounted projector 14 are separately prepared, and one of them is selected according to a desired usage arrangement. This is because, for example, when the stationary type is used as the ceiling-mounted type, the projected images are reversed vertically and horizontally.

[Problems to be Solved by the Invention] As described above, in the conventional video projector device, there is a limitation in the arrangement form, and the stationary type cannot be used as the ceiling-mounted type or the ceiling-mounted type cannot be used as the stationary type. There is inconvenience.

Particularly in recent years, liquid crystal projectors using a liquid crystal light valve (LCLV) have been commercialized. This liquid crystal projector has the features that it can easily achieve small size, light weight, high image quality, and large screen, and there is a demand for a liquid crystal projector that can be used as either a stationary type or a ceiling-mounted type because of the indoor installation space. ing.

The present invention has been made in view of the above points, and an object of the present invention is to provide a video projector device capable of freely selecting an arrangement form with a simple configuration without performing a complicated operation. .

[Means for Solving the Problems] The present invention relates to a video projector device that sequentially outputs image signals to a projection device to project an image, and an arrangement form determination unit that determines the arrangement form of the apparatus main body, and an image signal generation unit. Image output changing means for changing the output order, and switching means for switching the operation of the output changing means according to the form judged by the arrangement form judging means are provided.

[Operation] According to the present invention, the arrangement form determining means determines whether the device is stationary or suspended from the ceiling. When the projector is suspended from the ceiling, the operation of the image output changing device is switched by the switching device, so that an image whose vertical and horizontal directions are inverted as compared with the stationary state is projected.

EXAMPLES Examples of the present invention will be described below with reference to the accompanying drawings.

<First Embodiment> FIG. 1 shows a main part of a first embodiment of a video projector apparatus according to the present invention. In this embodiment, an image is projected by a double scan method such as IDTV. The ones shown in the figure are R, G,
It is provided for each color of B.

In the figure, the liquid crystal panel 30 is, for example, 440 × 4 in length × width.
It is composed of 80 pixels, and the drive scanning in the horizontal direction is performed by the shift register 32, and the scanning in the vertical direction is performed by the shift register 34.

To these shift registers 32 and 34 capable of bidirectionally shifting data, a clock signal serving as an operation reference and a discrimination signal indicating an arrangement form are input. Further, the horizontal shift register 32, the image signal is input,
The input direction is switched by the switch 36. On the other hand, a scanning signal for performing scanning in the vertical direction is input to the vertical shift register 34, and the input direction is switched by the switch 38. The switches 36 and 38 are adapted to be switched by a discrimination signal.

The above-mentioned discrimination signal is output from the arrangement form discrimination device 40 as shown in FIG. 2, for example. In the figure, a lever 44 is provided in the projector device case 42. One end of the lever 44 is fixed to a side portion of the case 42 by a hinge 46, and is movable in a direction of an arrow F1 in accordance with an arrangement form of stationary or ceiling suspension (shown in FIG. Status). Lever 44 moves to electrode 4
8 and 50 are arranged, and lever 44 is attached to either electrode.
When comes into contact, current flows. And
This current is detected by the discrimination circuit 52, and the arrangement form of the stationary ceiling mount is discriminated by this.

Next, each pixel cell P in the liquid crystal panel 30 is configured, for example, as shown in FIG. In the figure, lines 54 and 56 connected to the shift registers 32 and 34, respectively.
A switching transistor 58 for driving is connected to the. Then, in the switching transistor 58,
The storage capacitor 60 and the liquid crystal cell 62 are connected in parallel.

Next, the operation of the above embodiment will be described. First, the case of a stationary type (see FIG. 8A) will be described. In this case, the arrangement determination device 40 (see FIG. 2) switches the switches 36 and 38 so that the image signal is input from the left side of the horizontal register 32 and the scanning signal is input in the vertical shift register 34. Will be input from above. The data shift direction is set in the horizontal shift register 32 in the arrow F2 direction and the vertical shift register 34 is set in the arrow F3 direction in response to the input of the determination signal.

As a result, the input image signal is transferred from the address “000” to the address “47” in the horizontal shift register 32.
9 ”are sequentially shifted at the clock timing and stored. Further, the scanning signal is shifted from the address “000” to the address “439” in order in the vertical shift register 34 and stored at the clock timing.

Each horizontal line is sequentially driven by the data shift in the vertical shift register 34. Then, when the data stored in the horizontal shift register 32 is sequentially read from the address "000" and output to the driven horizontal line, as a result, the scanning as shown in FIG. It will be performed on the liquid crystal panel 30. If you observe this from the direction of arrow F4, you can enjoy the image well.

Next, the case of the ceiling suspension type (see FIG. 8B) will be described. In this case, the switches 36 and 38 are respectively switched by the determination signal output from the arrangement determination device 40, the image signal is input from the right side of the horizontal shift register 32, and the scanning signal is vertical. Input is made from the lower side of the direction shift register 34. The data shift direction is set in the horizontal shift register 32 in the arrow F5 direction and the vertical shift register 34 is set in the arrow F6 direction in accordance with the change in the determination signal.

As a result, the input image signal is transferred from the address “479” to the address “00” in the horizontal shift register 32.
"0" is sequentially shifted at the clock timing and stored. Further, the scanning signal is shifted from the address “439” to the address “000” in sequence in the vertical shift register 34 at the clock timing and stored.

For this reason, the scanning direction on the liquid crystal panel 30 is reversed upside down and leftward and rightward as shown in FIG. 4 (B), and an excellent image can be observed when the image is projected in a suspended state. .

As described above, according to the first embodiment, it is possible to simply switch the image signal input direction in the horizontal shift register 32 and the scan signal input direction in the vertical shift register 34. No
It is possible to respond favorably to changes in the layout configuration of stationary and ceiling suspension.

Second Embodiment Next, referring to FIGS. 5 and 6, the second embodiment of the present invention will be described.
Examples will be described. FIG. 5 shows the main parts of the second embodiment, and FIG. 6 shows the signal waveforms of the main parts of the second embodiment. The second embodiment is a modification of the image signal processing circuit in the first embodiment.

In FIG. 5, the digitized double scan Y signal is input to the terminal 100, which is connected to the memory unit 102 and the switching terminal A of the switch 104. The memory unit 102 has 1H memories 102A and 102B capable of storing a signal equivalent to one horizontal line (1H in double scanning) of an image, and the time is reversed within one horizontal line when suspended from the ceiling. A scan Y signal is generated.
Each output side of the 1H memories 102A and 102B is connected to the switching terminal B of the switch 104.

The operation control of the memory unit 102 is performed by the R (read) / W (write) control pulse generator 106, the down counter.
The output signals of the counter control pulse generator 112, which operates based on the output of the R / W control pulse generator 106, are used for the counting operation of the counters 108 and 110. It is based on.

Of these, the R / W control pulse generator 106 is a clock signal having a frequency obtained by multiplying the horizontal synchronizing frequency f _H , 63.5
Based on the horizontal synchronization signal H of μs, the 1H memories 102A, 102
The control pulse for reading / writing in B is generated. Further, the counter control pulse generator 112 outputs a pulse at the changing point of the R / W control pulse. Further, the down counter 108
Is for counting addresses for reading data from the 1H memories 102A and 102B.
Is to count addresses for writing data to the 1H memories 102A and 102B. These count outputs are alternately applied to the 1H memories 102A and 102B via the switch 114. These counters 108,11
As a result, the count value of 0 makes a round of the addresses of the 1H memories 102A and 102B in the horizontal synchronization cycle of the double scan.

Next, in the same manner, the double scan BY signal and the double scan RY signal are input to the terminals 116 and 118, respectively, and the terminals 116 and 118 have the same memory section 102 as the memory section 102 described above. They are connected to the input sides of 120 and 122 and the switching terminals A of switches 124 and 126, respectively. In addition, the memory unit 120, 12
The output side of 2 is connected to the switching terminals B of the switches 124 and 126, respectively.

The output sides of the switches 104, 124, 126 are respectively connected to an RGB matrix (not shown), and the Y signal, BY signal, and R- signal of the double scan analog-converted by the RGB matrix are respectively connected.
The liquid crystal panel is driven by the Y signal. The switches 104, 124 and 126 are adapted to switch the common terminal C to either of the switching terminals A and B at the same time, based on the logical value of the discrimination signal from the above-mentioned arrangement form discrimination device 40 (see FIG. 2). There is. The vertical direction is the same as in the first embodiment.

Next, the operation of the above embodiment will be described. First, the eighth
The case of the stationary type shown in FIG. In this case, as in the case described above, the switches 104, 124, 126 based on the discrimination signal output from the arrangement form discrimination device 40.
, The common terminal C is switched to the switching terminal A. Therefore, the Y, BY, and R-Y signals of the double scan are all output from the switches 104, 124, and 126 to the RGB matrix as they are, and the stationary projection is performed as shown in FIG. 8 (A).

Next, the case of the ceiling suspension type shown in FIG. 8 (B) will be described. In this case, the common terminal C of the switches 104, 124, 126 is switched to the switching terminal B by inverting the logical value of the determination signal.

At this time, for the Y, BY and RY signals of the double scan,
It is processed as follows. Since the processing for each signal is similar, the Y signal will be described as a representative. As shown in FIG. 6, since double scanning is performed in this embodiment, the horizontal synchronizing period HB is half the horizontal synchronizing period HA of the input video signal. Then, in response to this horizontal scanning period, a control pulse is output from the R / W control pulse generator 106 as shown in FIG. 7A and a control pulse is output from the counter control pulse generator 112 as shown in FIG. Control pulse is output.

Based on these control pulses, the 1H memory 102
In A and 102B, writing and reading of data are alternately performed in the horizontal synchronization period HB (see (C) and (D) in the same figure). At this time, the up counter 110 is stored in the memory in which the data is written by switching the switch 114.
The up-count value of the down counter 108 is input as a write address, and the down-count value of the down counter 108 is input as a read address to the memory from which data is read.

That is, in the 1H memories 102A and 120B, data writing and reading are alternately performed in the cycle of the double scan horizontal scanning period HB. Then, the address is reversed at the time of writing and at the time of reading at this time. Because of this, the switch
The Y signal output from 104 is a Y signal whose horizontal scanning direction is reversed, that is, a Y signal corresponding to an image in which the left and right are inverted. In this way, in the memory unit 102, 120, 122,
A video signal whose time is reversed in the horizontal scanning line is generated.

On the other hand, also in the vertical direction of the image, the scanning direction is reversed as described above. Therefore, when an image is projected by these video signals, it is normally observed when the projection is performed by the ceiling mount type as shown in FIG. 8 (B).

As described above, according to the second embodiment as well, it is possible to favorably deal with the change in the arrangement form of stationary and ceiling suspension.

In the above embodiment, the switches 104, 124, 126 are
Since a digital signal is switched, a data selector having a switch corresponding to the number of bits is used when transmitting data in parallel.

Further, in the memory section, in order to perform the time inversion of the video signal, the up count is performed at the time of recording and the down count is performed at the time of reading, but the same effect can be obtained by reversing these.

<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the present invention is applied to a video projector device using a CRT.

In the figure, a terminal 200 to which a video signal is input is connected to input sides of a video signal processing circuit 202, a horizontal scanning processing circuit 204, and a vertical scanning processing circuit 206, respectively. Each output side of the horizontal scanning processing circuit 204 and the vertical scanning processing circuit 206 has a deflection yoke drive circuit 208 for stationary use and a deflection yoke drive circuit 21 for ceiling mount use.
Each is connected to the 0 input side.

Next, the horizontal and vertical output sides of the deflection yoke drive circuit 208 are connected to the respective switching terminals A of the switches 212 and 214, and the horizontal and vertical output sides of the deflection yoke drive circuit 210 are connected to the switches 212 and 214. Each is connected to each switching terminal B. These switches 212 and 214 are designed to be switched by the above-mentioned discrimination signal, and their common terminal C is connected to the deflection signal input side of the CRT 216. The output side of the above-mentioned video signal processing circuit 202 is connected to the video signal input side of the CRT 216, and the output image is reflected by the mirror 218 and projected on the screen 220.

Note that each component is provided for each of R, G, and B so that a color image can be reproduced.

Next, the operation of the third embodiment as described above will be described. First, the video signal is subjected to desired signal processing in the video signal processing circuit 202 and input to the CRT 216. This CRT216 has a switch made based on the discrimination signal.
Deflection yoke drive circuit 2 depending on switching of 212 and 214
The drive signal of either 08 or 210 is input. That is, electron beam scanning is performed by the output signal of the deflection yoke drive circuit 208 in the case of the stationary type and by the output signal of the deflection yoke drive circuit 210 in the case of the ceiling suspension type.

As a result, in the case of hanging from the ceiling, an image which is vertically and horizontally inverted with respect to the image in the stationary state is projected on the screen 220.

<Other Embodiments> The circuit configuration can be modified in various ways so as to achieve the same effect, and these are also included in the present invention.

Further, although the present invention is applied to the double scan liquid crystal projector in the above-described embodiment, it may be applied to a normal scan one.

[Effects of the Invention] As described above, according to the present invention, there is an effect that it is possible to freely select the arrangement form of stationary or ceiling suspension with a simple configuration without performing a complicated operation.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing a configuration example of the arrangement pattern discriminating apparatus of the first embodiment, and FIG. 3 is the first embodiment. 4 is a circuit diagram showing a pixel cell in FIG. 4, FIG. 4 is an explanatory diagram showing the operation of the first embodiment,
FIG. 5 is a block diagram showing the main parts of the second embodiment, FIG. 6 is a time chart showing the operation of the second embodiment, FIG. 7 is a block diagram showing the main parts of the third embodiment, and FIG. The figure is an explanatory view showing the usage arrangement of the projector. 30 …… LCD panel, 32 …… Horizontal shift register, 34
... Vertical shift registers, 36,38,104,114,124,126,
212,214 ...... Switch, 40 …… Arrangement form determination device, 44 ・ ・ ・
… Lever, 52 …… discrimination circuit, 102,120,122 …… memory section, 102A, 102B …… 1H memory, 106 …… R / W control pulse generator, 108 …… down counter, 110 …… up counter, 112 …… counter Control pulse generator, 202 ... video signal processing circuit, 204 ... horizontal scanning processing circuit, 206 ... vertical scanning processing circuit, 208, 210 ...
Deflection yoke drive circuit, 216 …… CRT.

Claims (1)

[Claims] 1. A video projector device for sequentially outputting image signals to a projecting device to project an image, and a layout form determining device for determining a layout form of a device body, and an image output changing for changing an output sequence of image signals. A video projector device comprising: means and switching means for switching the operation of the output changing means in accordance with the form determined by the arrangement form determining means.