JP6598482B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device.

  As an image display device mounted on a recent digital camera or the like, a black and white image is displayed using white light generated by simultaneously lighting red (R), green (G), and blue (B) light sources. A field sequential type image display device is known (see, for example, Patent Documents 1 and 2).

  FIG. 2 is a timing chart showing the relationship between the lighting timing of the light source and the displayed image in the conventional image display apparatus. A conventional image display device includes, for example, a reflective liquid crystal panel and a plurality of light sources (LEDs) that supply light of each color of red (R), green (G), and blue (B) to an image display area of the liquid crystal panel. Etc.) and is configured to display a monochrome image by a field sequential method. When displaying a black and white image on a conventional image display device, image data for one frame is applied to each pixel in the image display area of the liquid crystal panel in one frame period represented as “Frame” in FIG. When this is completed, the light sources of red (R), green (G), and blue (B) are simultaneously turned on for a certain period to emit white light, thereby displaying a monochrome image for one frame. Then, by repeating the same operation in units of one frame, a series of continuous monochrome images are displayed.

Japanese Patent No. 36733317 Japanese Patent No. 4047333

  In recent digital cameras, for the purpose of improving the convenience of the photographer, the contour (edge) of the object in which the camera is focused is displayed on the screen of the image display device installed therein. Some of them have a so-called peaking function for displaying and highlighting in a different color from the surrounding area.

  In the peaking function, only a specific area in one image must be displayed in a partially different color, but the image display device mounted on the camera has red (R), Since an image display device of a so-called color filter system that displays a color image using green (G) and blue (B) color filters, any color can be independently expressed in units of pixels. It is also possible to easily realize a peaking function that displays only the outline of an object as a color image in a black and white image.

  However, in a field sequential image display device, in principle, a monochrome image and a color image cannot be displayed at the same time. Therefore, peaking is performed such that only the contour of an object is displayed as a color image in such a monochrome image. The function is not yet realized at the present time.

  The present invention has been made in view of the above situation, and even in a field sequential image display device, it is possible to realize a peaking function that displays only the contour of an object as a color image in a monochrome image. An object is to provide a possible image display device.

A monochrome display mode for displaying the black and white image, includes a color display mode for displaying a color image, and to display the first image is Oite monochrome image on the monochrome display mode, before Symbol color display mode In this case , the second image, which is a color image obtained by extracting only a partial region of the first image, is continuously displayed a plurality of times at different timings from the first image. and displaying the composite image and the image and the second image is visually superimposed content and color of the second image continuously displaying multiple times, the image display device the same as one another.

  The second image may be an image display device that is an image obtained by extracting an outline of an object included in the first image.

  The second image may be an image display device that is an image of only one of red, green, and blue.

  After the first image is continuously displayed a plurality of times, the second image obtained by extracting only a partial area of the first image displayed last is displayed as the first image last displayed. By displaying the images at different timings, it is possible to provide an image display device that displays a composite image in which the last displayed first image and the second image are visually superimposed.

  The image display device may be an image display device that is a field sequential image display device.

  The image display device may be an image display device that is a liquid crystal display device.

  According to the present invention, it is possible to realize a peaking function that displays only the outline of an object as a color image in a monochrome image even in a field sequential image display apparatus.

FIG. 3 is a timing chart showing the relationship between the lighting timing of the light source and the displayed image in an embodiment of the image display device of the present invention. Timing chart showing relationship between light source lighting timing and displayed image in a conventional image display device

  FIG. 1 is a timing chart showing the relationship between the lighting timing of a light source and a displayed image in an embodiment of the image display apparatus of the present invention. An embodiment of the image display device of the present invention supplies, for example, a reflection type liquid crystal panel and light of each color of red (R), green (G), and blue (B) to the image display area of the liquid crystal panel. A plurality of light sources (LEDs, etc.) are provided so that a monochrome image can be formed by a field sequential method and a color image can be formed by a field sequential method.

  In the present embodiment, when displaying a black and white image (hereinafter referred to as a black and white display mode), one pixel period in the image display area of the liquid crystal panel is set to 1 in one frame period as indicated by “Frame” in FIG. When the image data for the frame is written and the light source for each color of red (R), green (G), and blue (B) is simultaneously turned on for a certain period to emit white light. A monochrome image is displayed, and the same operation is repeated for each frame, thereby displaying a series of continuous monochrome images.

  On the other hand, when a color image is displayed in the present embodiment (hereinafter referred to as color display mode), each pixel in the image display area of the liquid crystal panel in one frame period represented as “Frame” in FIG. When one frame of image data is written in, and one of the light sources of red (R), green (G), and blue (B) is turned on for a certain period when it is completed, one frame Displays a color image of the minute.

  Here, as shown in FIG. 1, the display mode is temporarily switched to the color display mode in the middle of displaying a series of black and white images (Frames 1 and 2) in the black and white display mode. If an image obtained by extracting only the outline of an arbitrary object included in the displayed black and white image (Frame 2) is displayed as a green color image (Frame 3) for one frame, the color image (Frame 3) is displayed immediately before. By visually superimposing the black and white image (Frame 2), a composite image in which only the outline of the object is displayed as a green color image in the black and white image displayed immediately before can be displayed. . That is, it is possible to realize a peaking function that displays only the outline of an object as a color image in a black and white image.

  In the above-described embodiment, the color image obtained by extracting the contour of the object can be changed to a color image of other colors by changing the color of the light source to be lit. For example, if only a red light source is lit, a red color image can be obtained, and if only a blue light source is lit, a blue color image can be obtained. If they are turned on at the same time, it is possible to obtain a color image in which the colors are synthesized.

  The color image obtained by extracting the contour of the object may be a color image obtained by extracting the contour of the object included in the last displayed black and white image after displaying the black and white image three or more times continuously. The contents of the monochrome images displayed continuously may be the same or different from each other.

  In addition, the color images obtained by extracting the contours of the object may be displayed with the same contents continuously a plurality of times, and in this case, the colors of the color images displayed continuously are the same as each other. Or they may be different from each other.

  The color image obtained by extracting the contour of the object may be displayed before displaying the original black-and-white image from which the contour of the object is extracted.

  Further, the region extracted from the black and white image is not limited to the contour of the object, but may be other regions.

  In the color display mode, one frame is divided into a plurality of subframes, and any one of red (R), green (G), and blue (B) light sources is selectively used in each subframe period. It is also possible to display a color image of an arbitrary color for one frame if the color image of each subframe is visually superimposed on each other.

  In addition, a series of color images are displayed in the color display mode, and the display mode is temporarily switched to the monochrome display mode in the middle of the display. In the monochrome display mode, an arbitrary object included in the color image displayed immediately before is displayed. If an image obtained by extracting only the outline is displayed as a monochrome image for one frame, it is possible to display only the outline of the object as a monochrome image in the color image displayed immediately before.

  The white light required in the black and white display mode may be generated by a white (W) light source provided separately from the light sources of red (R), green (G), and blue (B).

  The present invention makes it possible to realize a peaking function that displays only the outline of an object as a color image in a monochrome image in a field sequential image display device. However, the invention does not depart from the gist of the present invention. Can be applied to image display devices other than field sequential image display devices, and images other than image display devices (liquid crystal display devices) that display images using the light modulation action of liquid crystals. The present invention can also be applied to a display device.

Claims (6)

Black and white display mode for displaying black and white images,
A color display mode for displaying a color image,
The monochrome display to display the first image is Oite monochrome image mode, before Symbol color display mode of the portion of Oite said first image area only the extracted second is a color image by the image from the first image to display continuously a plurality of times at different timings, and the first image and the second image displays a visually superimposed composite image,
The content and color of the second image that is continuously displayed a plurality of times are the same as each other.
An image display device characterized by that.   The image display apparatus according to claim 1, wherein the second image is an image obtained by extracting an outline of an object included in the first image. The second image, red, green, image display apparatus according to claim 1 or 2, characterized in that an image of only one color of blue. After the first image is continuously displayed a plurality of times, the second image obtained by extracting only a partial area of the first image displayed last is displayed as the first image last displayed. by displaying different timings and claim 1-3 in which the last displayed the first image and the second image is displayed visually superimposed composite image, characterized in that The image display device according to any one of the above. The image display apparatus, an image display apparatus according to any one of claims 1-4, characterized in that the image display device of field sequential method. The image display apparatus, an image display apparatus according to any one of claims 1-5, characterized in that a liquid crystal display device.

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