JPS6157759B2 - - Google Patents

Description

[Detailed description of the invention] FIELD OF THE INVENTION The present invention relates to an ambient-illuminated display device.

First, the peripheral illumination type display device proposed by the present applicant will be explained. A front view of this display device is shown in FIG. In the figure, 1 indicates a main video display section, and 2 indicates a relaxation video display section. The main video display section 1 is the video screen of a color television receiver. The relaxed image display section 2 uses the light at the outermost periphery of the main image to present a relaxed image with significantly lower resolution and contrast than the main image. In the configuration shown in FIG. 1, a main video display section 1 and a relaxation video display section 2 serve as image display sections, which are surrounded by a video frame 3. An illumination light presentation section 4 is provided surrounding this video frame 3. A light source of illumination light is provided behind the illumination light presentation section 4. Reference numeral 5 denotes an outer frame arranged along the outer edge of the illumination light presentation section 4.

The illumination light presentation section 4 has a height of (1/
The brightness is preferably about (1 to 1/2) times the average brightness of the main image display section 1, and the luminance is macroscopically uniform. It is better to have a shape that is highly eye-catching and to have no uneven brightness. The degree of saturation of the hue of the illumination light presented to the illumination light presentation unit 4 needs not to be too high.

According to the above configuration, it is possible to comfortably view images that are clear, powerful, and even have a three-dimensional effect.
It has been confirmed that even if you watch it for a long time, you will not feel tired. Such effects can be further enhanced by providing the relaxation image display section 2.
This effect can also be explained by human visual characteristics.

Human eyes constantly and intermittently move the point of gaze unconsciously through eye movements, and the center of the eye captures external information and sends it to the brain. For example, when viewing a television image, the fovea of the retina scans the image, and the peripheral area near the fovea is simultaneously stimulated by light. If the stimulation received by this peripheral area and its changes are due to things other than the image (for example, the frame, reflected light from the surroundings, other objects in the room, etc.),
Shifting the point of gaze disrupts smoothness and causes negative effects. The above-mentioned illumination light presentation section 4 prevents the surrounding area of the fovea from receiving unnatural stimulation when viewing such images, and has the function of promoting smooth movement of the point of gaze. . Therefore, the spatial information contained in the image can be fully perceived, increasing the realism of the image.Furthermore, it is less tiring and less affected by reflections of ambient light, making it possible to view the image comfortably. can.

The present invention forms a temporal average value for each primary color video signal of color video signals supplied to a color television receiver regarding the above-mentioned ambient lighting type display device, and modulates the light of the light source according to this average value. However, the brightness of the illumination light presentation section 4 is made approximately equal to the average brightness of the image light of the main image display section 1.

An embodiment of the present invention will be described below. FIG. 2 shows a specific example of an ambient illumination type display device, and in the figure, reference numeral 6 indicates a color picture tube of a color television receiver. 7 is color picture tube 6
8 shows the fluorescent surface of the color picture tube. A color video signal from a television broadcast or a video tape recorder is supplied to the color picture tube 6, and a reproduced image is presented on the video screen 7. For example, the transmittance is 50 so as to cover the light emitting area of the image plane 7.
[%] neutral filter 9 is arranged. The area of this neutral filter 9 becomes the main video display section 1. A transparent reflecting plate 10 is provided along the outer edge of the neutral filter 9 and is erected substantially perpendicularly to the image plane 7. This transparent reflective plate 10
The end face of the image frame 3 is colored dark and gray with low reflectance, and becomes the image frame 3.

In the specific example shown in FIG. 2, unlike in FIG. 1, the relaxation image display section 2 is not provided. Illumination light is then presented above the image plane 7 (neutral filter 9) and on the left and right sides. In the present invention, as shown in FIG. 1, it is not necessary to provide the illumination light presentation section 4 having a width equal to four circumferences including the lower part of the main image display section 1. If the illumination light is presented at least above the image plane 7, the above-mentioned visual effect will occur. Fluorescent tubes R ₁ , R ₂ , R ₃ , G 1 , G ₂ whose tube surfaces are coated with red, green, and blue paint to generate red, green, and blue primary color lights as illumination light sources, respectively _. , G ₃ , B ₁ ,
B ₂ and B ₃ are provided. Three fluorescent tubes R ₁ , G ₁ , B ₁ that generate three primary color lights are arranged horizontally above the image plane 7, and a fluorescent tube R ₂ is arranged to the left (right) of the image plane 7. , R ₃ , G ₂ , G ₃ , B ₂ , and B ₃ are arranged vertically.
However, in FIG. 2, the fluorescent tubes R ₃ , G ₃ , and B ₃ are not shown. A correction filter 11 is arranged in front of these fluorescent tubes for color correction and the like. Light from these fluorescent tubes is irradiated onto a milky white scattering plate 13 via a fly's eye lens 12. The fly's eye lens 12 is used to eliminate unevenness in brightness and to mix three primary colors of light. The milky white scattering plate 13 is used to provide uniform illumination light over the entire surface, uniformly mix the three primary colors, and adjust the color tone, and constitutes the illumination light presentation section 4 as a screen. A neutral filter 14 for suppressing reflected light is provided in front of the milky white scattering plate 13.

A box-shaped case 15 is provided around the color picture tube 6 in order to mount the above-mentioned fluorescent tube, fly's eye lens 12, milky white scattering plate 13, and neutral filter 14. The front end surface of this case 15 becomes the outer frame 5 (see FIG. 1). This case 15
A reflective plate (for example, a plastic reflector) is pasted on the inner wall of the building to make effective use of light. Furthermore, a scattering and reflecting plate 16 is provided below the image plane 7 with an inclination. The peripheral illumination type display device having the above configuration is kept at an appropriate height by the support stand 17.

Fluorescent tubes R ₁ , R ₂ , R ₃ as sources of illumination light,
The intensities of the color lights G ₁ , G ₂ , G ₃ , B ₁ , B ₂ , and B ₃ are modulated according to the temporal average value of each primary color video signal that drives the color picture tube 6 . In Figure 3, 2
1, 22, 23, and 24 are color difference signals R- demodulated from a received signal or a color video signal from a video tape recorder or the like and applied to the color picture tube 6, respectively.
This is an input terminal to which Y, G-Y, B-Y and a luminance signal Y are supplied. Addition circuit 28R, 28G, 28
By supplying the color difference signals from the input terminals 21, 22, and 23 and the luminance signal from the input terminal 24 to B, a red video signal S R is generated at the output of the adder circuit 28R, and the red video signal S _R is generated at the output of the adder circuit 28G. A green video signal S _G is generated at the output of the adding circuit 28B, and a blue video signal S _B is generated at the output of the adder circuit 28B. In this case, variable resistors 25, 26, and 27 for color level adjustment are provided.

Low-pass filters 29R, 29G, and 29B are connected to these adder circuits 28R, 28G, and 28B as circuits for extracting temporal average values, respectively. These low pass filters 29R, 29
The cutoff frequency of G, 29B is 2 [Hz] ~ 20
It has been selected as an extremely low value of [Hz]. These low-pass filters 29R, 29G, 29B are connected to correction amplifiers 30R, 3 having antilogarithmic input/output characteristics.
0G and 30B are connected. This correction amplifier 3
The output voltages of 0R, 30G, and 30B are supplied to voltage-current conversion circuits 31R, 31G, and 31B. The output currents of the voltage-current conversion circuits 31R, 31G, 31B are applied to the light emitting diodes of the photocouplers 32R, 32G, 32B, and the output signals of the photocouplers 32R, 32G, 32B generated from the photoconductive elements are applied to the dimmers 33R, 33G, 33B. is given as a control signal. An AC power source 34 is added to the dimmers 33R, 33G, and 33B, and the flow angle of the AC power source is controlled by a control signal sent through the photocouplers 32R, 32G, and 32B.
The intensity of colored light generated from the red fluorescent tube R ₁ , green fluorescent tube G ₁ , and blue fluorescent tube B ₁ connected to the dimmers 33R, 33G, and 33B is modulated. Although not shown, other fluorescent tubes R ₂ , R ₃ , G ₂ , G ₃ , B ₂ , and B ₃ are also connected to each dimmer 3.
It can be driven by 3R, 33G, and 33B.

With the above configuration shown in FIG. 3, the intensity of light from the fluorescent tube is modulated in accordance with the temporal average value of each primary color video signal supplied to the color picture tube 6. Therefore, the brightness of the illumination light presentation section is approximately equal to the average brightness of the image light. Further, since the hue of the illumination light changes to some extent to follow changes in the image light, even if the image is surrounded by the illumination light, a good visual effect can be obtained without making it look unnatural. Another method of changing the hue and brightness of the illumination light in relation to the image light is to sample the light at a specific position in the image and modulate the light of the fluorescent tube with this sampled component. However, this method has the disadvantage that depending on the content of the image, the illumination light may flicker, causing discomfort. In the present invention, such a drawback does not occur for videos of any content. The large area colored light varying in luminance approximately equal to the image light obtained by the present invention is natural, comfortable, stable, and does not cause irritating discomfort. Because of such stability, the illumination light only needs to be positioned at least at the top of the image, and there is no need to surround it with a uniform width including the bottom. Therefore, the peripheral illumination type display device can be manufactured at low cost. Furthermore, there is an advantage that forming a temporal average value for each primary color video signal of a color video signal can be realized using a simpler circuit than obtaining sampling values as described above.

[Brief explanation of the drawing]

FIG. 1 is a front view of the basic configuration of an ambient illumination type display device, FIG. 2 is a partially cutaway front view and sectional view of an embodiment of the present invention, and FIG. 3 is an electrical diagram of an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration. 1 is a main image display section, 4 is an ambient light presentation section, 6 is a color picture tube, 29R, 29G, 29B are low-pass filters, R ₁ , R ₂ , R ₃ are fluorescent tubes that generate red color light, G ₁ , G ₂ , and G ₃ are fluorescent tubes that generate green color light, and B ₁ , B ₂ , and B ₃ are fluorescent tubes that generate blue color light.

Claims (1)

[Claims] 1. An illumination light presentation unit provided around the image plane of a color television receiver so as to include at least the upper part of the image plane, and 3 for forming illumination light.
a primary color light source, which forms a temporal average value for each primary color video signal of the color video signals supplied to the color television receiver, modulates the light from the light source according to this average value, and An ambient illumination type display device, wherein the brightness of the illumination light presentation section is approximately equal to the average brightness of the image light on the image plane.