JPH05188346A - Projector - Google Patents

Abstract

PURPOSE:To turn a projecting picture plane by a prescribed angle without moving a projector main body. CONSTITUTION:The projector is constituted so that a video signal of a one- screen portion is stored temporarily in a rearrangement memory 8, and by a rearranging circuit 7, a read-out sequence of the video signals stored in the memory 8 is made different in accordance with the vertical and the horizontal directions of a display plane to output the video signals, this outputted video signal is displayed on a LCD panel 11 on which the number of picture elements in the vertical and the horizontal directions is equal, and also, other area than a display area is displayed as a margin area, and in the margin area of this LCD panel 11, supplementary display data is displayed by a supplementary display data circuit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector using a liquid crystal panel.

[0002]

2. Description of the Related Art Recently, a video projector has been used for projecting and displaying a video signal on a large screen.

A conventional video projector is designed to directly display an input video signal,
Therefore, for example, when a video camera or an electronic still camera shoots a vertical screen and an image is projected on the screen by a video projector, the screen becomes horizontal. Therefore, in such a case, the video projector itself is laid down to deal with it.

However, when the video projector main body is used sideways in this manner, the main body cannot be easily laid sideways because it may block the intake and exhaust passages of the projector.

[0005]

As described above, in the conventional video projector, when a video camera or an electronic still camera shoots in a vertical screen and an image is projected on the screen, the projection screen becomes horizontal, and the projection screen remains as it is. Then there was a problem that could not be used.

The present invention has been made in view of the above circumstances, and provides a projector capable of rotating a display screen by a predetermined angle without moving the projector body and additionally displaying supplementary display data. The purpose is to

[0007]

The projector of the present invention stores a video signal for at least one screen, and converts the order of input video signals so that the order of the video signals can be varied according to the vertical and horizontal directions of the display screen. Means, a liquid crystal panel having the same number of pixels in the vertical and horizontal directions for displaying the video signal output from the means and displaying the area other than the display area as a blank area, and means for displaying supplementary display data in the blank area of the liquid crystal panel. It is configured.

[0008]

As a result, according to the present invention, not only a horizontal screen but also a vertical screen obtained by rotating the screen by a predetermined angle can be displayed on a liquid crystal panel having the same number of pixels in the vertical and horizontal directions. The supplemental display data such as clock data can be displayed using the blank area of.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the schematic construction of the embodiment.
In the figure, reference numeral 1 denotes a sync / YC signal separation circuit. This sync / YC signal separation circuit 1 amplifies a composite video signal and then extracts a video signal and performs sync separation to generate a vertical sync signal and a horizontal sync signal. It takes out and outputs the video signal to the A / D converter 2 and the sync signal to the sync control circuit 3, respectively. The sync control circuit 3 creates various timing signals from the vertical sync signal and the horizontal sync signal,
It outputs to the A / D converter 2, the segment electrode drive circuit 4, and the common electrode drive circuit 5. Further, the segment electrode drive circuit 4 and the common electrode drive circuit 5 are supplied with a multivalued liquid crystal drive voltage from the liquid crystal drive voltage generation circuit 6.

The A / D converter 2 converts the video signal into a digital signal in synchronization with the sambling clock from the synchronization control circuit 3 and outputs it to the rearrangement circuit 7. To this rearrangement circuit 7, a rearrangement memory 8, a screen changeover switch 9, and an additional display data circuit 10 are connected.

Here, the rearrangement circuit 7 is capable of changing the output order of a digitized video signal for one screen, that is, a pixel signal for one screen supplied from the A / D converter 2. Here, the reading order of the pixel signals for one screen temporarily stored in the rearranging memory 8 is different between the normal horizontal screen display and the vertical screen display on the LCD panel 11 according to the instruction of the screen changeover switch 8. And output it. In this case, the rearrangement memory 8 has a capacity for storing pixel signals for two screens, and at the same time as writing the pixel signals for one screen, another
The pixel signals for the screen are read out. The supplementary display data circuit 10 is adapted to output supplementary display data displayed in a blank area of the LCD panel 11.

The output from the rearrangement circuit 7 is sent to the segment electrode drive circuit 4. The segment electrode drive circuit 4 creates a gradation signal in accordance with the pixel signal from the rearrangement circuit 7, and drives the segment electrodes of the matrix type LCD panel 11 for display. In this case, the common electrode drive signal is output to the common electrode drive circuit 5 in accordance with the timing signal from the synchronization circuit 3, and the common electrodes of the LCD panel 11 are sequentially and selectively driven, so that the LCD panel 11 is driven.
The video image from the rearrangement circuit 7 is output above.

In this case, the LCD panel 11 has a square shape having the same number of pixels in the vertical and horizontal directions as shown in FIG. 2, and when the rearrangement circuit 7 outputs a pixel signal corresponding to a horizontal screen, the same. When a normal horizontal screen 112 (a hatched portion in the drawing) having blank areas 111 in the upper and lower portions is formed as shown in FIG. 10A and a pixel signal corresponding to the vertical screen is output, it is shown in FIG. As described above, the screen is rotated by 90 degrees to form the vertical screen 113 (the hatched portion in the drawing) having the margin areas 111 in the left and right portions. In this case, the screen is rotated 180 degrees by the output of the rearrangement circuit 7, and an upside down horizontal screen 114 (a hatched portion in the drawing) having a blank area 111 in the upper and lower portions can be formed.

According to the video projector thus constructed, however, when the normal horizontal screen is instructed by the screen changeover switch 8, the digitized pixel signal for one screen from the A / D converter 2 is generated. , Rearranging memory 8
At the same time, the pixel signals for one screen stored previously are read out from the rearrangement circuit 7 in the order of normal horizontal screen display, and the LCD signals via the segment electrode drive circuit 4.
Given to panel 11. This allows the LCD panel 1
1 has a margin in the upper and lower portions 111 as shown in FIG. 2A, but a normal horizontal screen 112 is displayed.

Therefore, by allowing light from a light source (not shown) to pass through such an LCD panel 11,
A horizontal screen image having blank areas in the upper and lower portions is projected on the screen.

In this case, by outputting the supplemental display data from the supplemental display data circuit 10, the supplemental display can be performed in the margin area 111 of the horizontal screen 112 of the LCD panel 11 as shown in FIGS. it can. For example, if clock data is output from the supplementary display data circuit 10, clock display 121, current status data of the projector, and the like are output. Input terminal display 122, video adjustment display 123, text broadcasting, and other subtitles are output. The display 124 and the like can be displayed.

On the other hand, when the vertical screen is instructed by the screen changeover switch 8, the pixel signals for one screen previously stored in the rearrangement memory 8 are displayed by the rearrangement circuit 7 this time. The data is read out in order and given to the LCD panel 11 via the segment electrode drive circuit 4. As a result, the LCD panel 11 has the blank area 111 in the right and left portions as shown in FIG. 2B, but the vertical screen 113 is formed.

Therefore, by allowing light from a light source (not shown) to pass through such an LCD panel 11,
A vertical screen image having margins on the left and right parts is projected on the screen.

In this case, in this case, when an inverted screen is instructed by the screen changeover switch 8, the screen is changed to 180 by the output of the rearrangement circuit 7 as shown in FIG.
It is also possible to display the inverted horizontal screen 114 rotated once.

Therefore, in this manner, the rearrangement circuit 7 changes the reading order of the pixel signals for one screen stored in the rearrangement memory 8 in accordance with the instruction of the screen changeover switch 8 so that a blank area is formed in the upper and lower portions. Of course, it is possible to obtain not only the horizontal screen that it has, but also a vertical screen that has a margin area in the left and right parts that is rotated by 90 degrees, and an inverted horizontal screen that is rotated by 180 degrees. When shooting a vertical screen with a still camera and attempting to project an image on the screen, the projected screen becomes horizontal, and what could not be used as it is is projected by the screen switching switch 8 without moving the projector body. By rotating the screen by a predetermined angle, you can easily deal with these problems and use them. Hand can be significantly improved.
The present invention is not limited to the above-mentioned embodiments, and can be carried out by appropriately modifying it without departing from the scope of the invention.

[0022]

According to the present invention, the projection screen can be rotated by a predetermined angle without moving the projector body.
Not only the horizontal screen display but also the vertical screen display can be easily obtained, and desired information can be displayed in the margin area of the screen.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the embodiment of FIG.

FIG. 3 is a diagram for explaining the embodiment of FIG.

[Explanation of symbols]

1 ... Sync / YC signal separation circuit, 2 ... A / D converter, 3 ...
Synchronous control circuit, 4 ... Segment electrode drive circuit, 5 ... Common electrode drive circuit, 6 ... Liquid crystal drive voltage generation circuit, 7 ... Rearrangement circuit, 8 ... Rearrangement memory, 9 ... Screen changeover switch, 10 ... Supplementary display data , 11 ... LCD panel.

Claims (1)

[Claims] 1. A conversion means which has a storage means for storing at least one screen of video signals and which can output the input video signals by changing the order of the input video signals in the vertical and horizontal directions of the display screen. A liquid crystal panel having substantially the same number of pixels in the vertical and horizontal directions for displaying the output video signal and displaying the area other than the display area as a blank area; and means for displaying supplemental display data in the blank area of the liquid crystal panel. A projector characterized by.