JPS6157758B2 - - Google Patents

Description

[Detailed description of the invention] BACKGROUND OF THE INVENTION 1. 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 must not be too high, and the time change in its brightness should be more gradual than the average light of the main image or the change in its specific location. Ru.

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 relates to the above-mentioned ambient illumination type display device in which a signal for obtaining illumination light is multiplexed with a video signal or an audio signal supplied to a color television receiver. According to the present invention, compatibility with current color television systems can be achieved. Further, since the amount of information of the illumination light is small, multiplexing is easy. Furthermore, it is easy to present desired illumination light.

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, 6 indicates a color picture tube of a color television receiver. 6a indicates the image plane of the color picture tube 6, and 7 indicates the fluorescent surface of the color picture tube. A received or reproduced 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 image plane 6a. A neutral filter 8 having a transmittance of 50%, for example, is arranged so as to cover an area other than the peripheral area of the image plane 6a. The area of this neutral filter 8 becomes the main video section 1.

Reference numeral 9 denotes a case, and the case 9 is constituted by an inner case 9a and an outer case 9b, which are square cylinders and coaxial, and have a circular opening.
The inner peripheral shape of the inner case 9a is made to match the outer peripheral shape of the front side of the color picture tube 6. A light reflection plate 1 is installed along the outer edge of the neutral filter 8, approximately perpendicular to the image plane.
0 is provided between the transparent reflector 10 and the inner wall of the inner case 9a, and a neutral filter (transmittance 50%) 11 and a transmitting filter are sequentially installed from the front for the purpose of magnifying and scattering the peripheral light of the color picture tube 6. Several Fresnel convex lenses 13 are arranged in series with the shaped scattering plate 12 . The area of this neutral filter 11 becomes the relaxed image display section 2, and the end surface of the inner case 9a is colored dark and gray with low reflectance and becomes the image frame 3.

A cylindrical space (referred to as an illumination box) that is partitioned by an inner case 9a and an outer case 9b and surrounds the color picture tube 6.
The height h of the front opening is, for example, 1/2 of the height of the neutral filter 8, and a fluorescent tube as a light source is arranged behind it. A red fluorescent tube, a green fluorescent tube, and a blue fluorescent tube whose tube surfaces are coated with red, green, and blue paint, respectively, are used as light sources. Four sets of fluorescent tubes, each consisting of three fluorescent tubes that emit light in these three primary colors, are arranged at the left, right, upper and lower positions of the image display section. The red fluorescent tubes placed horizontally at the top and bottom of the image display section are indicated by R ₁ and R ₂ , and the green fluorescent tube is indicated by R 1 and R 2.
G ₁ and G ₂ indicate blue fluorescent tubes, B ₁ and B ₂ indicate red fluorescent tubes, and R ₃ and R ₄ indicate red fluorescent tubes arranged vertically at the left and right positions of the image display section, respectively. green fluorescent tube
They are designated G ₃ and G ₄ , and the blue fluorescent tubes are designated B ₃ and B ₄ . However, R ₄ , G ₄ , and B ₄ are not shown in FIG. 2. Furthermore, a correction filter 14 is arranged in front of each of the fluorescent tubes for color correction and the like.

The front and rear depth d of the lighting box should be at least twice the total tube pitch, for example 4, due to the mixing of colored lights from the fluorescent tubes.
It is said to be doubled. Furthermore, in order to effectively utilize the illumination light, a reflective plate, such as a plastic mirror with an aluminum reinforcing plate, is attached to the inner wall of the illumination box and rear case. A milky white scattering plate 15 is provided to cover the front opening of the lighting box, and a neutral filter 16 having a transmittance of 25 to 75% is further arranged in front of the milky white scattering plate 15. Further, a transparent scattering plate, such as a fly's eye lens 17, is provided at an intermediate position between the front opening and the light source. This fly's eye lens 17 is used to eliminate unevenness in brightness and to mix the three primary colors of light. A milky white scattering plate 15 is provided to eliminate unevenness in brightness and provide uniform illumination light over the entire surface, uniformly mix the three primary colors, and adjust the color tone.The milky white scattering plate 15 serves as a screen for illumination light presentation section 4 Configure. A neutral filter 16 is provided to suppress reflected light. Further, an outer frame 18 is provided on the outer edge of the front surface of the outer case 9b.

Unlike the one shown in FIG. 2 above, as shown in FIG.
A transmissive screen 21 having a window 20 corresponding to the image plane is arranged in front of the color television receiver 19, and three fluorescent tubes R, G, and B that generate the three primary colors are arranged on the upper surface of the color television receiver 19. A configuration may also be adopted in which a housed light stand 22 is arranged. The transmission screen 21 is composed of, for example, a milky-white scattering plate, and the fluorescent tube R of the light stand 22,
The lights from G and B are mixed by a fly's eye lens or the like provided in front of these lights, and then projected onto the transmission screen 21. According to the configuration shown in FIG. 3, the transmission type screen 21 and the light stand 2 are
By simply adding 2, an ambient illumination type display device can be realized.

Fluorescent tubes R and R ₁ that generate the three primary colors mentioned above
〜R ₄ , G, G ₁ 〜 G ₄ , B, B ₁ 〜 _{B 4} A signal that modulates the light to produce desired illumination light is sent to the color picture tube 6.
(color television receiver 19). FIG. 4 shows an example of a configuration for this purpose. In Figure 4, 25
is an input terminal to which a transmitted color video signal or a color video signal reproduced from a video signal reproducing device such as a video tape recorder is applied. This color video signal is supplied to a mixer 26 and a synchronization separation circuit 28 of a timing pulse forming circuit 27 shown surrounded by a broken line. Further, 29 indicates a circuit for forming a carrier color signal for illumination, for example, an NTSC encoder, and red, green, blue and carrier waves are transmitted from terminals 30R, 30G, 30B, and 30C to the NTSC encoder 2.
9, a carrier signal Sl for illumination is obtained at its output. The signal Sl is supplied to the mixer 26 via the switch circuit 31 controlled by the gate signal Pg and multiplexed into a color video signal, and a color video signal containing the signal Sl appears at the output terminal 32. In this example, the illumination signal Sl is multiplexed in a predetermined period within the vertical blanking period of the color video signal, for example, in the interval between the 20th and 21st horizontal synchronization signals counted from the leading edge of the vertical synchronization signal VD. Ru. For this purpose, the switch circuit 31 is turned on in the above-mentioned period by the gate pulse Pg. A gate pulse Pg is formed based on a timing pulse Pt from a timing pulse forming circuit 27.

In order to form the timing pulse Pt, the horizontal synchronization signal HD (horizontal period) from the synchronization separation circuit 28 is
(including equivalent pulses with a period of 1/2) are supplied to a 5-bit counter 33. The vertical synchronization signal VD from the synchronization separation circuit 28 is supplied to the leading edge extraction circuit 34, and the vertical synchronization signal from the leading edge extraction circuit 34 is
The RS flip-flop 35 is set by the pulse corresponding to the leading edge of VD. The output Q of the flip-flop 35 is applied to the reset input terminal R of the counter 33 so that the counter 33 performs a counting operation only while the output Q is at a high level. The outputs Qc and Qe of this counter 33 are supplied to an AND gate 36, and a timing pulse Pt is generated at the output of the AND gate 36. Further, the output Qa of the counter 33 and the output of the AND gate 36 are supplied to an AND gate 37, so that the flip-flop 35 is reset by the output of the AND gate 37.

Timing pulses formed as described above
Monostable multivibrators 38a and 38b are provided which are triggered by the rise of Pt, and a gate pulse Pg is generated from an AND gate 39 to which the outputs of both are supplied.

Now, the vertical blanking period of the color video signal from the input terminal 25 is, as shown in FIG. EQ) and 24 horizontal sync signals following the equivalent pulse period EQ. As shown in FIG. 5B, from the leading edge of the vertical synchronizing signal VD, the flip-flop 35
The output Q becomes high level, and the counter 33 counts the equivalent pulses and horizontal synchronization signals in numerical order in FIG. 5A. Note that a burst signal Sb exists after the 12th and subsequent horizontal synchronization signals.

When the 20th equivalent pulse and horizontal synchronization signal are counted, the outputs Qc and Qe of the counter 33 are counted.
becomes high level, and the other outputs Qa, Qb, Qd become low level. When the counter 33 counts the next 21st horizontal synchronization signal, the output of the counter 33 is
Qa will also be at a high level. Therefore, when the 20th horizontal synchronizing signal is counted, the output of the AND gate 36 becomes high level, and when the next 21st horizontal synchronizing signal is counted, the output of the AND gate 37 also becomes high level.
The flip-flop 35 is reset by the rise of the output of the AND gate 37, and its output Q
(FIG. 5B) goes low, which causes counter 33 to be reset and all of its outputs go low. Eventually, the timing pulse Pt becomes high level in one horizontal period between the 20th horizontal synchronizing signal and the 21st horizontal synchronizing signal, as shown in FIG. 5C.

The monostable multivibrators 38a and 38b are triggered by the rise of the timing pulse Pt, and a gate pulse Pg having a pulse width of _τ2 is generated from the AND gate 39 with a time delay of _τ1 from the rise of the timing pulse Pt. Since the switch circuit 31 is turned on by this gate pulse Pg, as shown in FIG. 5A, the illumination carrier color signal Sl
are mixed in the mixer 26 and appear at the output terminal 32.

The color video signal appearing at this output terminal 32 is supplied to an ambient-illuminated display device. FIG. 6 shows a configuration in which this signal Sl drives fluorescent tubes R, G, and B, which are light sources for illumination, and emit red, green, and blue light, respectively. In FIG. 6, 40 is an input terminal for receiving (or reproducing) color video signals including the signal Sl.
Although not shown, a color signal obtained by demodulating the received color video signal is applied to a color picture tube of an ambient illumination type display device. The received color video signal is supplied to an NTSC decoder 41 and a synchronization separation circuit 42, and the NTSC decoder 41 outputs red, green, and blue primary color video signals S _R ,
_SG and _SB are obtained. Primary color video signals S are sent to sampling hold circuits 43R, 43G, and 43B, respectively.
_R , S _G and S _B are supplied.

These sampling hold circuits 43R, 4
A sampling pulse Ps is supplied from a sampling pulse generation circuit 44 to 3G and 43B. This sampling pulse generation circuit 44 has a fourth
Timing pulse generation circuit 27 with the same configuration as shown in the figure
A timing pulse Pt is supplied from. As described above, the timing pulse Pt becomes high level in one horizontal period between the 20th and 21st horizontal synchronization signals within the vertical blanking period. This timing pulse
A sampling pulse Ps is generated within the interval defined by Pt. Therefore, each of the sampling outputs of the sampling and holding circuits 43R, 43G, and 43B is a color signal of three primary colors obtained by demodulating the carrier color signal Sl for illumination. This sampling output is the photocoupler drive circuit 45R, 45G, 45
B and photocouplers 46R, 46G, 46B to fluorescent tube dimming circuits 47R, 47G, 47B as control signals. An AC power source 48 is supplied to these fluorescent tube dimming circuits 47R, 47G, and 47B.

a fluorescent tube R connected to the output of each dimmer circuit;
The colored lights generated by G and B are produced by photocouplers 46R and 4.
The intensity is modulated according to the sampling output transmitted via 6G and 46B.

Note that in this example, one type of colored light is generated as the illumination signal, but
A plurality of types of colored light signals having different brightness and hue may be multiplexed into separate horizontal sections within the vertical blanking period, so that a person viewing the display device can select a favorite colored light. Furthermore, a color picture tube 6
The illumination light may be changed in relation to the content of the main video, or the illumination light may be modulated with an audio signal. In this way, various illumination signals can be used to multiplex the color video signal in order to enhance the display effect.

Further, in the above embodiment, the illumination signal is multiplexed in a predetermined section within the vertical blanking period, but the illumination signal may be multiplexed into an audio signal or in the form of a digital signal.

As is clear from the above description, according to the present invention, since the illumination signal Sl is multiplexed into a color video signal in advance, an ambient illumination type display device can be operated using the current color television system. be able to. At the same time, since there is no need for a new configuration for forming illumination signals on the display device side, the circuit configuration of the display device can be simplified. Moreover, it becomes easy to set the brightness and hue of the illumination light to desired values, and the visual effect of the peripheral illumination type display device can be further improved. Furthermore, since the amount of information in the illumination signal is small, there is an advantage that this signal can be easily multiplexed into a color video signal.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the basic configuration of an ambient illumination type display device, FIG. 2 is a partially cutaway front view and sectional view of an example of the peripheral illumination type display device, and FIG. 3 is a perspective view of another example. FIG. 4 is a block diagram of a configuration for multiplexing illumination signals in an embodiment of the present invention, FIG. 5 is a waveform diagram used to explain the operation, and FIG.
The figure is a block diagram of a configuration for separating illumination signals and supplying them to a fluorescent tube in one embodiment of the present invention. 1 is a main image display section, 4 is an illumination light presentation section, 6 is a color picture tube, 26 is a mixer, 27 is a timing pulse forming circuit, 29 is an NTSC encoder, 41 is a
NTSC decoder, R, R ₁ to _{R 4} are fluorescent tubes that generate red color light, G, G ₁ to _{G 4} are fluorescent tubes that generate green color light, and B, B ₁ to _{B 4} are blue color light. It is a fluorescent tube that generates.

Claims (1)

[Claims] 1. In a peripheral illumination type display device having an illumination light presentation section that surrounds the image surface of a color television receiver and a light source of illumination light, the display device may be used for a video signal or an audio signal supplied to the color television receiver. An ambient illumination type display device which multiplexes signals of at least one type of colored light whose brightness and hue are specified, and modulates the light from the light source using the signals.