JP2819695B2 - Projector device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device that projects an optical image to form an image on a screen.

[Conventional technology]

As a projector system, a projector device is installed in front of a reflective screen and a light image is projected from the projector device to form an image on the reflective screen surface. There is a rear type in which an optical image is projected from an apparatus and formed on the transmission screen.

In the latter rear type, since the entire system is usually housed in a box, the periphery of the transmissive screen is surrounded by, for example, a black bezel, and the image formed on the transmissive screen is Can be clearly distinguished.

[Problems to be solved by the invention]

However, in the former front type, margins are often left around the reflective screen, or they are often walls or spaces, so that the distinction between the image and the surrounding area is not clear. However, there is a problem that the image is difficult to see.

SUMMARY OF THE INVENTION An object of the present invention is to provide a projector device which can clearly distinguish an image formed from its surroundings even in a front type projector system, thereby improving a viewing environment.

[Means for solving the problem]

The present invention is a projector device that is installed on a wall surface, stands upright on a floor surface via a stand or the like, or projects a light image on a reflective screen suspended from a ceiling, and forms the light image there. An image corresponding to the input image on the screen by adding a signal of a specific color or pattern to a display period before and after a vertical blanking period and a display period before and after a horizontal blanking period of an input image signal. And displaying a frame image of the specific color or pattern in a portion surrounding the periphery of the image, and disposing an optical sensor in advance on a portion of the screen where the frame image is formed, The detection signal of the sensor was used as a signal for convergence adjustment.

〔Example〕

Hereinafter, examples of the present invention will be described. FIG. 1 is a diagram showing an example of a front type projector system of the embodiment. Reference numeral 1 denotes a projector device which uses three projection tubes. Reference numeral 2 denotes a reflection type screen, which is set so as to come to the focal point of the lens of the projector device 1 by hanging from a ceiling, standing on a stand, hanging on a wall surface, or the like.

FIG. 2 is a view showing the projection tubes 11 to 13 of the projector device 1. The projection tubes 11 to 13 have R (red) images, G
(Green) image signal and B (blue) image signal are input, respectively, and the corresponding RGB color projection light is converted into a vertical synchronization signal V and a horizontal synchronization signal H.
Is scanned in the horizontal direction while scanning in the vertical direction,
As a result, the images of the respective colors of RGB are combined on the surface of the reflective screen 2, and a color image is formed on the surface of the reflective screen 2 and reflected.

In the present embodiment, the level of the RGB signal to be input to the projection tubes 11 to 13 is fixed to a predetermined level in the display period before and after the vertical blanking period, and at a predetermined level in the display period before and after the vertical blanking period. A frame image signal is added, so that a frame image 22 is projected around an original image 21 projected on the reflective screen 2. As a result, the original image 21 is clearly distinguished from the surrounding visual environment by the frame image 22, so that the image 21 is easy to see.

FIG. 3 shows a process for forming the frame image 22 in B (blue) color.
6 is a timing chart of an RGB signal. First, frame image 22
The upper part 22a is the time T during the vertical blanking period.
Only during the period 1, only the B signal is formed with a constant value set over the entire horizontal scanning period. Next, for the left and right portions 22b and 22c of the frame image 22, at the time T2 of the area of the original image 21, the first time T21 of the horizontal blanking period,
Only during the last time T22, only the B signal is set to the above-mentioned constant value and formed. Furthermore, the lower part 22d of the frame image 22
Is formed by setting only the B signal to the above-mentioned constant value over the entire horizontal scanning period only during the time T3 in the vertical blanking period. As described above, the frame image 22 surrounding the image 21 is formed in B (blue) color.

Note that the color of the frame image 22 can be selected to an arbitrary color by setting the level of the RGB signal during the period of scanning the portion as described above. In addition, it is naturally possible to form the frame image 22 with an arbitrary line or color pattern by the same processing.

In this embodiment, since the frame image 22 is formed around the image 21, an optical sensor is provided in advance on the edge of the reflective screen on which the frame image 22 is formed, and the optical sensor detects the image. If the pattern to be projected is projected as a frame image 22, each of the projection tubes 11 to
The 13 convergences can be automatically performed by the signal detected by the optical sensor described above.

〔The invention's effect〕

As described above, according to the projector device of the present invention, since the frame image is formed around the original image formed on the screen, the original image is clearly distinguished from the outside of the screen by the frame image. Therefore, there is an advantage that the image can be easily viewed. Moreover, since the signal for the frame image is one signal in addition to the input image, the configuration is simple, and the color and pattern of the frame image can be arbitrarily set and selected, so that there is great flexibility. Further, when an optical sensor is provided in a portion of the screen where the frame image is formed and the frame image is set in a predetermined pattern, there is an advantage that a signal for convergence adjustment can be obtained from the optical sensor.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a front type projector system according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a projection tube of the projector device, and FIG. 3 is a timing chart for forming a frame image. 1 ... Projector device, 11-13 ... Projection tube, 2 ... Reflective screen, 21 ... Original image, 22 ... Frame image.

Claims (1)

(57) [Claims] 1. A projector device that is installed on a wall surface, projects an optical image on a reflective screen that stands on a floor surface via a stand or the like, or is suspended from a ceiling, and forms the optical image thereon. By adding a signal of a specific color or pattern to the display period before and after the vertical blanking period and the display period before and after the horizontal blanking period of the input image signal, Displaying the image, displaying a frame image of the specific color or pattern in a portion surrounding the periphery of the image, and disposing an optical sensor in advance in a portion where the frame image on the screen is formed, A projector device, wherein a detection signal of an optical sensor is a signal for convergence adjustment.