JPS6145671Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a lighting device that can generate illumination light whose brightness, saturation, etc. are controlled according to the images when viewing images such as television images and movies. That is.

FIG. 1 shows a projection type color television receiver as an example of a video display device, and in the figure, 1 indicates a projector. A color picture tube 2 for projection, a reflecting mirror 3, and a lens 4 are housed in the projector 1, and a color image from the color picture tube 2 is enlarged and projected onto a reflective screen 5.

An embodiment of the present invention using such a projection type color television receiver will be described with reference to FIG. 2 and subsequent figures. As shown in Figure 2, the screen 5
In the room where the audience 6 is viewing the enlarged and projected image, lighting means 7a are installed around the screen 5, for example, at the boundary between the ceiling and the wall, and between the wall and the floor.
7b, 7c, and 7d are provided. This lighting means 7
A to 7d illuminate the ceiling, wall surface, floor, etc. around the screen 5.

FIG. 3 shows an example of illumination means 7a to 7d. In FIG. 3, 8R, 8G, and 8B indicate fluorescent tubes whose tube surfaces are colored red, green, and blue, respectively, and 9
R, 9G, 9B are fluorescent tubes 8R, 8G, 8, respectively.
A reflector plate for B is shown. Fluorescent tube 8R, 8G, 8
Red, green, and blue colored light generated from B is milky white glass 1
0 and taken out to the outside.

Further, a plurality of detection means for detecting the color or brightness of the image displayed on the screen 5 are provided. In this example, as shown in FIG.
a to 11d are provided. Detection elements 11a to 11
d detects the amount of each of the red, green, and blue components of the color image of the color picture tube 2. Specifically, each color light component is separated by an optical filter and C _d
This can be realized by a configuration provided to a photoelectric conversion element such as a photodiode or the like. Further, a detection element may be provided in the funnel portion of the color picture tube 2, as shown by the broken line in FIG. Furthermore, the detection may be performed from the image itself displayed on the screen 5.

Signals for driving the fluorescent tubes 8R, 8G, 8B of the illumination means 7a-7d are formed from the detection outputs of the detection elements 11a-11d. In Figure 5, 12
Each of R, 12G, and 12B is a detection element 11a to
11d, each light receiving element generates a detection output of a level corresponding to the amount of each color light component of the three primary color lights. This detection output is supplied to detection circuits 14R, 14G, 14B via amplifiers 13R, 13G, 13B, and this detection output is supplied to integrators 15R, 15G, 15B. The integrators 15R, 15G, 15B take out the average value of the detection signals corresponding to the three primary color lights, and this average value is sent to the drive circuits 16R, 16G,
16B, drive circuits 16R, 16
Fluorescent tubes 8R, 8G, and 8B are driven by G and 16B. Therefore, fluorescent tubes 8R, 8G, 8B
emits light in accordance with the average brightness and color of the peripheral area of the image, illuminating the surrounding area. Note that another method for detecting the color or brightness of an image is to obtain information on the brightness and color of a specific location or overall trend by sampling the video signal, and to provide this information to the drive circuit. It's okay.

As understood from the description of one embodiment above,
According to the present invention, the brightness or color of the periphery (four corners) of the image on the screen 5 is extracted, and the periphery of the indoor screen 5 is illuminated with illumination light according to this component, creating a comfortable video viewing environment. can be formed. In other words, the brightness of the surrounding area changes depending on the brightness of the image on the screen 5, so that the image can always be viewed under constant conditions, and in order to make the image easier to see,
There is no need to turn off or adjust the lighting in the room, and there is no sense of discomfort between the image and its surroundings, so you can watch it for a long time without getting tired.

FIG. 6 shows another example of the illumination means. In other words,
The light from the fluorescent tube 8R (same for the other fluorescent tubes 8G and 8B) is used as illumination light through the linear polarizing plates 17a and 17b, with one linear polarizing plate 17a being fixed and the other linear polarizing plate 17b being fixed. It is configured to be rotated by a ping motor. Since the linear polarizing plates 17a and 17b have polarization axes as shown by the arrows in FIG. 6, the amount of transmitted light is maximum when these polarization axes coincide, and the amount of transmitted light is minimum when they are perpendicular to each other. (approximately zero). Then, as shown in FIG.
R, and the amount of change in red color light is calculated by this differentiating circuit 1.
8R, and this detection output is sent to the motor drive circuit 1.
Supply to 9R. A stepping motor 20R is rotated by this motor drive circuit 19R, and the aforementioned polarizing plate 17b is rotated by a predetermined angle by the motor 20R.

Note that as a light source for illumination light, a halogenated thallium lamp (green), a halogenated indium lamp (blue), etc. can be used in addition to a fluorescent tube.

Furthermore, in addition to using an illumination means using _a light source of three primary colors, as shown in FIG.
The transparent electrodes 22a, 22b are sandwiched between
The white light from the lamp 23 can also be converted into a desired color tone by applying a voltage to the lamp 23 .
24 and 25 indicate polarizing plates, and 26 indicates a lens.

It should be noted that the present invention is suitable for use with images such as movies other than projection type television receivers.

[Brief explanation of the drawing]

Fig. 1 shows the structure of a projection type color television receiver used in one embodiment of the present invention, Fig. 2 is a diagram used to explain one embodiment of the present invention, Fig. 3 is a cross-sectional view showing an example of an illumination means, Fig. 4 is a diagram used to explain the mounting position of a detection element, Fig. 5 is a block diagram of an example of a configuration for driving the illumination means, Figs. 6 and 7 are perspective views of another example of the illumination means and block diagrams of its drive system, and Fig. 8 is a perspective view of still another example of the illumination means. 1 is a projector, 2 is a color picture tube, 5 is a screen, 7a to 7d are illumination means, 8R, 8G,
Reference numeral 8B denotes fluorescent tubes which generate red, green and blue light, respectively, and reference numerals 11a to 11d denote detecting elements.

Claims (1)

[Scope of utility model registration request] a light source that is disposed in a space around the video display section and generates light whose brightness or color is controlled; a plurality of detection means that detects the color or brightness of the video on the video display section; means for forming a drive signal for the light source from the output of the means.