JPH05224170A - On-vehicle video display device - Google Patents

Abstract

PURPOSE:To project monochromatic light with constant brightness from a liquid crystal display when the angle of the liquid crystal display is adjusted to make the light from the screen face down. CONSTITUTION:The liquid crystal display 8 is provided at the front-side end part of a 2nd slider 6 rotatably through a hinge 7. On the upper front side of the hinge 7, a screen direction detection switch 11 which detects the direction of the screen of the liquid crystal display 8 is provided. It is decided whether or not the screen of the liquid crystal display 8 stands from the detection result of the screen direction detection switch 11 to put the liquid crystal display 8 in television screen control mode when the screen stands or in hand-area confirmation lighting mode when not. Consequently, when the angle of the liquid crystal display 8 is adjusted to make the light from the screen face down, the monochromatic light having constant brightness can be projected from the liquid crystal display 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted image display device provided in a vehicle and providing various information to a driver or the like, and more particularly to a vehicle-mounted image display device that can be used as a lighting device. ..

[0002]

2. Description of the Related Art In recent years, a ceiling light has been mainly used as an illuminating device for vehicles such as passenger cars. However, when the driver drives the ceiling light to see the map at night, it causes an accident. The ceiling lights had to be turned on during a temporary stop. For this reason, a map lamp that obtains power from a cigarette lighter socket has been put into practical use.

FIG. 9 is a perspective view showing such a conventional map lamp.

In FIG. 9, reference numeral 91 is a plug for obtaining power from a cigarette lighter socket.
A power supply terminal 92 connected to a socket of a cigarette lighter is provided at one end of the No. 1 and one end of a flexible pipe 93 is connected to the other end. The other end of the flexible pipe 93 is connected to the main body 94. A power cable is passed through the inside of the flexible pipe 93, and the power voltage from the power terminal 92 is supplied to the main body section 94 side. The main body 94 is provided with a light emitting portion 95 having a light emitting diode built in on one surface, and a power switch 96 for turning on and off a drive circuit of the light emitting portion 95 on the side surface.

When such a map lamp is used after being turned off, the power switch 96 is turned on, the drive circuit of the light emitting section 95 is turned on, and the light emitting section 95 is turned on. After the light emission, an appropriate force is applied to the main body 95 to bend the flexible pipe 93, and the light from the light emitting unit is applied to the map. Since such an operation can be performed with one arm without the driver raising his / her waist, the driver can turn on the light emitting unit 95 and see the map while driving at night.

However, in recent vehicles, a liquid crystal display type in-vehicle image display device is provided for a driver to obtain information on a satellite navigation device and an occupant to watch a television broadcast. There is also an audio device. Such devices are centrally arranged in the instrument panel and its vicinity, and the switches of these devices are also concentrated in the instrument panel and its vicinity. In addition, the aforementioned cigarette lighter socket is also provided on the instrument panel. Therefore, the operation of the vehicle-mounted video display device and stereo audio device
It is often disturbed by a map lamp attached to the cigarette lighter socket. Here, generally, in a vehicle-mounted image display device, a liquid crystal display is mounted on a flexible pipe in a state in which an angle can be adjusted. Therefore, by adjusting the angle of the liquid crystal display and irradiating the map at the driver's hand with the light from the screen,
It is possible to use the on-vehicle image display device also as a map lamp, but the illumination light from the liquid crystal display changes in brightness and color according to the displayed image, so the map flickers and it is quite difficult to see, Inappropriate.

[0007]

In the above-described conventional vehicle-mounted image display device, the angle of the liquid crystal display is adjusted so that the light from the screen is directed downward to irradiate the map at the hand position. When the liquid crystal display is used as a map lamp, the illumination light from the liquid crystal display changes in brightness and color in accordance with the displayed image, so that the map flickers and is difficult to see, which is unsuitable.

The present invention eliminates the above-mentioned problems, and when the angle of the liquid crystal display is adjusted and the light from the screen is directed downward, the liquid crystal display can emit monochromatic light of a constant brightness. Video display device.

[0009]

A vehicle-mounted image display device according to the present invention is a liquid crystal display device for mounting a mount portion inside a vehicle and a mount portion rotatably on the mount portion, and for making light of a backlight form a screen. A liquid crystal display that displays an image by transmitting it through a panel, an image / color amplification circuit that converts a supplied image signal into three primary color signals, and the liquid crystal panel based on the three primary color signals from this image / color amplification circuit A liquid crystal panel drive circuit for driving the driver, information video signal supply means for supplying a video signal for displaying an image for providing information to a driver on the liquid crystal display, and a constant signal from the liquid crystal display. Based on a predetermined operation, a monochromatic light video signal supply means for creating a video signal for irradiating monochromatic light of Switching means for performing switching, and based on the switching of the switching means, the video signal from the information video signal supplying means and the video signal from the monochromatic light video signal supplying means are switched and converted into three primary color signals. And a control means for controlling the video / color amplification circuit.

[0010]

According to this structure, when the angle of the liquid crystal display is adjusted and the light from the screen is directed downward, the switch means is operated for switching, and the control means is based on the switching of the switch means. Thus, the video / color amplification circuit can be controlled so as to convert the video signal from the monochromatic video signal supply means into the three primary color signals, so that the liquid crystal display can emit monochromatic light of a constant brightness. it can.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an in-vehicle image display device according to the present invention.

In FIG. 1, reference numeral 1 is a storage portion provided in the central portion of the instrument panel.
Has a structure in which a front cabinet 3 is attached to a box portion 2 accommodated in the central portion of an instrument panel. The box portion 2 is open on the driver's seat side, and a mounting portion 21 for slidably mounting the first slider 4 is provided on the inner lower surface. The front cabinet 3 has an opening 5 formed therein. As a result, the first slider 4 of the storage unit 1 can be pulled out and stored via the opening 5 of the front cabinet 3. A second slider 6 is slidably mounted inside the first slider 4.
Further, the storage section 1 is provided with a slider detection switch 22 for detecting the position of the second slider 6 with respect to the storage section 1.

A liquid crystal display 8 is rotatably provided at the front end of the second slider 6 via a hinge 7. A screen orientation detection switch 11 for detecting the orientation of the screen of the liquid crystal display 8 is provided on the upper front side of the hinge 7. A liquid crystal panel 9 for color forming a screen is provided on one surface of the liquid crystal display 8, and a backlight 10 is provided on the back surface of the liquid crystal panel 9. In the liquid crystal display 8, the light of the backlight 10 is a liquid crystal panel. An image is displayed on the liquid crystal panel 9 by passing through 9. On the side of the liquid crystal display 8,
Television receiver dedicated system, television receiver,
A system changeover switch 12 is provided for switching to the illumination device sharing system. A key input means 13 including a power switch 131 and a channel up / down key is provided from the hinge 7 on one surface of the liquid crystal display 8. These switches 11,
Microcomputers for turning on and off the backlight 10 and for switching the display mode of the liquid crystal panel 9 are also provided corresponding to on and off of the light switches 12 and 22, the key input means 13 and the interior light of the passenger car. Has been.

FIG. 2 is a circuit diagram showing a circuit of the vehicle-mounted image display device of FIG.

The in-vehicle image display device uses R as a broadcast signal.
The F signal a is used. The RF signal a induced in the antenna 31 is supplied to the tuner 32. The tuner 32 is
Channel selection is performed based on the channel selection signal b of the micro computer 41, and the image intermediate frequency signal c is supplied to the image intermediate frequency circuit 33. The video intermediate frequency amplification circuit 33 performs intermediate frequency amplification and detection on the video intermediate frequency signal c to convert the video intermediate frequency signal c into a video signal d, and supplies the video signal to the video / color amplification circuit 34 and the synchronization processing circuit 40. The signal e is converted and supplied to the audio amplification circuit 35. Voice amplifier circuit 3
5 amplifies the audio signal e and outputs it from the speaker 36. On the other hand, the synchronization processing circuit 40 separates the horizontal and vertical synchronization signals from the video signal d, supplies the horizontal synchronization signal dH to the on-screen circuit 37 and the interface circuit 38 described later, and supplies the vertical synchronization signal dV to the interface circuit 38. To do. Further, the synchronization processing circuit 40 uses the timing signal d based on the separated horizontal and vertical synchronization signals.
T is created and supplied to the video / color amplification circuit 34. The video amplification circuit 34 uses the timing signal dT to generate the video signal d.
Is converted into three primary color signals of red, green and blue, amplified, and supplied to the on-screen circuit 37 as the three primary color signals dRGB, and when the luminance signal dB and the color signal dC are supplied from the microcomputer 41, The on-screen circuit 37 converts the luminance signal dB and the color signal dC into three primary color signals of red (R), green (G), and blue (B) and amplifies them as the three primary color signals dRGB instead of the signal d.
Supply to.

The video amplifier circuit 34 will be described in more detail. The video amplifier circuit 34 is composed of a chroma processing circuit 341 and a video signal processing circuit 342. The chroma processing circuit 341 performs signal processing based on the timing signal dT, and converts the color signal of the video signal d into the color difference signal d.
The signal is converted into C1 and supplied to the video signal processing circuit 342, and the luminance signal of the video signal d is supplied to the video signal processing circuit 342 as the luminance signal dB1. Further, the chroma processing circuit 341 converts the color signal dC into a color difference signal dC1 instead of the video signal d, when the luminance signal dB and the color signal dC forming the monochromatic light video signal are supplied from the microcomputer 41. To the video signal processing circuit 342, and the luminance signal dB is supplied to the video signal processing circuit 342 as the luminance signal dB1. Video signal processing circuit 342
Performs signal processing based on the timing signal dT, converts the color difference signal dC1 and the luminance signal dB1 into three primary color signals, amplifies them, and supplies them to the on-screen circuit 37 as three primary color signals dRGB.

The interface circuit 38 creates horizontal and vertical sync data f from the horizontal and vertical sync signals dH and dV from the sync processing circuit 40 and supplies it to the liquid crystal panel 9. The on-screen circuit 37 converts the three primary color signals from the video amplifier circuit 34 into parallel digital pixel data for one horizontal scanning period based on the horizontal synchronization signal dH from the synchronization processing circuit 40, and also the microcomputer 4
When the video data h indicating the receiving channel or the like from 1 is supplied, the digital pixel data and the video data h are combined, and the liquid crystal panel 9 is used as the digital pixel data g.
Supply to. In the liquid crystal panel 9, writing of pixel lines in the horizontal direction is turned on and off based on the horizontal and vertical synchronization data f, and digital pixel data for one horizontal scanning period is added to the turned-on pixel lines. g is written.

On the other hand, the DC voltage h from the power supply terminal 51 is
It is supplied to the DC / DC converter 53 via the protection circuit 52. The protection circuit 52 has a breaker function for preventing overvoltage, detects the DC voltage h, and supplies a detection signal i1 of the detection result to the monitoring circuit 54. The monitoring circuit 54 monitors the detection signal i1 and supplies the signal i2 of the monitoring result to the microcomputer 41.

The DC / DC converter 53 is a protection circuit 52.
The DC voltage from is boosted and supplied to the inverter circuit 55. The inverter circuit 55 is the microcomputer 41.
ON / OFF control is performed on the basis of the ON / OFF signal j from the DC power supply, and the high frequency voltage k is generated from the DC voltage from the DC / DC converter 53 in the ON state and supplied to the backlight 10. The liquid crystal panel 9 has digital pixel data g written in the pixels, and the backlight 10
Is transmitted with a transmittance based on the digital pixel data g. As a result, an image is displayed on the liquid crystal panel 9.

The microcomputer 41 is supplied with a key input signal m from a television power switch 131, a key input means 13 such as a channel up / down key, and a slider detection switch 22, a screen orientation detection switch 11 and a method selection switch 12. , A light switch detection circuit 42 for detecting ON / OFF of a light switch of a passenger car
Are supplied with signals n, o, p and q, respectively.

The microcomputer 41 supplies a tuning signal c to the tuner 32 in response to the key input signal m, a control signal to the video amplifier circuit 34, and video data h to the on-screen circuit 37. I am doing it. Further, the microcomputer 41 has a monitoring circuit 54.
From the key input means 13, the key input signal m from the key input means 13, the switches 22, 11, and 12 and the signals m, n, p, o, and q from the light switch detection circuit 42 to turn on / off the inverter circuit 55. And the luminance signal d
B and the color signal dC are supplied to the video amplifier circuit 34.
The luminance signal dB and the color signal dC are set to have a predetermined ratio of the R component, the G component, and the B component so as to form a white light image signal having a constant brightness.

FIG. 3 shows such a microcomputer 4
It is explanatory drawing explaining the process when the initial state of 1 is a storage state.

In the initial state, the backlight 10 is off and the TV power switch 131 of the key input means 13 is off, so the image display function is off. Further, the slider detection switch 22 is turned on when the liquid crystal display 8 is housed, and the screen orientation detection switch 11 is turned on.
Is off.

The operation of the microcomputer 41 in this case will be described. In step S1, a process for detecting whether the liquid crystal display 8 is housed by detecting the on / off state of the slider detection switch 22 is performed. If the slider detection switch 22 is on, the liquid crystal display 8 is housed. And again step S1
Then, the process of step S1 is repeated until the liquid crystal display 8 is pulled out. When the liquid crystal display is pulled out, the slider detection switch 22 is turned off, a predetermined time (about several seconds) is waited in step S2, and the screen of the liquid crystal display 8 is turned on by detecting the on / off state of the screen orientation detection switch 11. Determine if there is.
If the screen orientation detection switch 11 is in the on state, the screen is up and the determination is yes, and the process of step S3 is performed. If the screen orientation detection switch 11 is in the off state, the screen is not up. Becomes NO and the process of step S5 is performed.

In step S3, it is determined whether or not the television power switch 131 of the key input means 13 is turned on. If the television power switch 131 is off, the determination is no and the process returns to step S1. .. If the television power switch 131 is turned on in step S3, the determination is yes and step S4
In the television screen control mode, the microcomputer 41 turns on the inverter circuit 55 to cause the backlight 10 to emit light, and the television broadcast digital pixel data g is written in the liquid crystal panel 9. This allows
The television broadcast is displayed on the screen.

In step S5, it is determined whether the system changeover switch 12 is turned on to determine whether the system is set to the television receiver dedicated system or the television receiver / illuminator shared system. , In the case of the television receiver dedicated system, that is, the system changeover switch 1
If No. 2 is off, the determination is no, and the process returns to step S1 again, and if the system is a television receiver / illuminating device sharing system, that is, if the system changeover switch 12 is on, the determination is yes. Then, the process of step S6 is performed. Step S6 is the light switch detection circuit 4
It is determined from the signal p from 2 that the light switch of the passenger car is turned on. If the light switch is off, the determination is no, and the process returns to step S1 again and the light switch is turned on. In the case, the determination is yes and the hand confirmation illumination mode is set in step S7, and the microcomputer 41 supplies the luminance signal dB and the color signal dC, which form the image signal of white light of constant brightness, to the image amplification circuit 34. Supply. White light with a constant brightness is emitted to the driver's hand.

Although not shown, when the initial state is the television screen control mode, the screen orientation detection switch 1
It is determined whether the screen of the liquid crystal display 8 is standing by detecting the on / off state of 1, and if it is determined that the screen is standing, the television screen control mode is maintained,
If it is determined that the screen is not standing, the lighting mode for hand confirmation is switched to. When the initial state is the hand confirmation illumination mode, it is determined whether the screen of the liquid crystal display 8 is up from the detection result of the screen orientation detection switch 11, and if it is determined that the screen is not up, the hand confirmation illumination is displayed. If the mode is maintained and it is determined that the screen is standing, the mode is switched to the TV screen control mode.

According to such an embodiment, with the liquid crystal display 8 pulled out from the storage unit 1, by turning the screen downward, the lighting mode for hand confirmation is obtained, and the map etc. placed at the driver's hand. The white light of a constant brightness can be emitted from the liquid crystal display 8, and the liquid crystal display 8 can be used as illumination for checking the driver's hand.

FIG. 4 is a perspective view showing another embodiment of the vehicle-mounted image display device according to the present invention. In the embodiment shown in FIG. 4, the present invention can be applied to a liquid crystal display mounted on a flexible pipe.

In FIG. 4, reference numeral 61 is a mounting portion which is mounted on the floor of the passenger car. One end of this mounting portion 61 is mounted on the floor of the passenger car by bolts and the other end is connected to one end of the flexible pipe 62. Has been done. A power cable 63 and an antenna cable 64 are drawn in from the side of the mounting portion 61. Flexible pipe 62
At the other end, a liquid crystal display 66 is rotatably provided via a hinge 65. A power cable 63 and an antenna cable 64 are passed through the inside of the flexible pipe 62, and a power voltage and an RF signal from the antenna are supplied to the liquid crystal display 66 side. A liquid crystal panel 67 for color forming a screen is provided on one surface of the liquid crystal display 66, and a backlight 68 is provided on the back surface of the liquid crystal panel 67.

The shaft portion 69 of the hinge 65 is connected to the other end of the flexible pipe 62, and a disc-shaped metal fitting 70 is attached and fixed to the left end portion. Disc-shaped metal fitting 70
A protrusion 71 is formed on the front side of the. A switch 72 is provided above the disc-shaped metal fitting 70 inside the liquid crystal display 66. The switch 72 constitutes a screen orientation detection switch together with the disc-shaped metal fitting 70. The switch 72 is turned off when the liquid crystal display 66 faces the front as shown in the side view of FIG. 5, and is shown in the side view of FIG. When the liquid crystal display 66 faces downward as described above, the protrusion 71 of the disc-shaped metal fitting 70 comes into contact with the liquid crystal display 66 and is turned on. The liquid crystal display 66 is in the television screen control mode when the switch 70 is off, and is in the hand confirmation illumination mode when the screen orientation switch 70 is on.

According to such an embodiment, by turning the screen of the liquid crystal display 66 downward, the hand confirmation illumination mode can be set, and therefore, the same effect as the embodiment of FIG. 1 is obtained.

FIG. 7 is a side view showing another embodiment of the vehicle-mounted image display device according to the present invention. The same components as those of the embodiment of FIG. is doing.

In FIG. 7, the present modification is different in that instead of providing the disc-shaped metal fitting 70 and the switch 72 as the screen orientation detection switch of the liquid crystal display 80, a tubular member 81, a piece 82 and a switch 83 are provided. That is.

More specifically, the tubular member 81 is
Inside the liquid crystal display 80, the liquid crystal panel 67 side, that is, the front side is provided obliquely with its height raised. Tubular member 81
A piece 82 made of lead or the like is movably inserted into the inside of the. The switch 8 is provided on the front side of the tubular member 81.
3 is provided. As shown in FIG. 7, when the liquid crystal display 80 faces the front, the piece 82 is a tubular member 81.
The switch 83 is turned off because it comes to the rear side inside the
As shown in the side view of FIG. 8, when the liquid crystal display 80 faces downward, the piece 82 comes to the front side inside the tubular member 81, and the switch 83 is turned on. The liquid crystal display 81 is in the television screen control mode when the switch 83 is off, and is in the hand confirmation illumination mode when the switch 83 is on.

According to such an embodiment, by turning the screen of the liquid crystal display 80 downward, it is possible to set the illumination mode for hand confirmation, so that there is the same effect as the embodiment of FIG. Since the orientation of the screen of the display 80 is detected by gravity, it is possible to set the hand confirmation illumination mode even when the flexible pipe 62 is curved instead of the hinge 65 and the screen of the liquid crystal display 80 is directed downward.

In the embodiment of FIG. 1, the lights exclusively used for the illumination, which the light switch detection circuit 42 detects on / off, include headlights, backlights, interior lights, etc.
Various types may be used. In the embodiment shown in FIG. 1, the system changeover switch 12 can be used to switch between the television receiver-dedicated system and the television receiver / illuminator shared system. However, the system changeover switch 12 is omitted. Only the television receiver and the lighting device common system may be used. Further, the light switch detection circuit 42 may be omitted so that the liquid crystal display 8 can be used as illumination regardless of day or night. Further, although the luminance signal dB and the color signal dC supplied from the microcomputer 41 to the video amplifier circuit 34 are signals that constitute a video signal of white light of constant brightness, they show monochromatic light of constant brightness. As long as they are used, various types of light such as red light and blue light may be used.

Further, in the embodiment of FIG. 1, the present invention is applied to the vehicle-mounted video display device for receiving the television broadcast, but it may be applied to the vehicle-mounted video display device for displaying the information of the satellite navigation device. ..

[0040]

According to the present invention, when the angle of the liquid crystal display is adjusted and the light from the screen is directed downward, the liquid crystal display can emit monochromatic light of a constant brightness. Can be used as a driver's hand confirmation illumination.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an in-vehicle image display device according to the present invention.

FIG. 2 is a circuit diagram showing a circuit of the vehicle-mounted video display device of FIG.

FIG. 3 is a flowchart showing an operation of the vehicle-mounted video display device of FIG.

FIG. 4 is a perspective view showing another embodiment of the vehicle-mounted image display device according to the present invention.

5 is a side view showing a state in which the liquid crystal display of the vehicle-mounted image display device of FIG. 4 faces the front.

6 is a side view showing a state in which the liquid crystal display of the vehicle-mounted image display device of FIG. 4 faces downward.

FIG. 7 is a side view showing another embodiment of the vehicle-mounted image display device according to the present invention.

8 is a side view showing a state in which the liquid crystal display of the vehicle-mounted image display device of FIG. 7 faces downward.

FIG. 9 is a perspective view showing a conventional map lamp.

[Explanation of symbols]

 1 Storage Section 4 First Slider 6 Second Slider 7 Hinge 8 Liquid Crystal Display 9 Liquid Crystal Panel 10 Backlight 11 Screen Orientation Detection Switch

Claims (3)

[Claims] 1. A mount part provided in a vehicle, and a liquid crystal display rotatably provided on the mount part and displaying an image by transmitting light of a backlight to a liquid crystal panel constituting a screen. A video / color amplification circuit for converting the generated video signal into three primary color signals, a liquid crystal panel drive circuit for driving the liquid crystal panel based on the three primary color signals from the video / color amplification circuit, and providing information to the driver Information video signal supply means for supplying a video signal for displaying a video on the liquid crystal display to the video / color amplification circuit, and a video signal for irradiating monochromatic light having a constant brightness from the liquid crystal display. A monochromatic light image signal supplying means for supplying the image / color amplifying circuit to the image / color amplifying circuit, and a switch means for switching the image signal according to a predetermined operation. Control means for controlling the video / color amplifying circuit so as to switch the video signal from the information video signal supply means and the video signal from the monochromatic light video signal supply means to convert into a three primary color signal. An in-vehicle image display device comprising: 2. A light switch detection circuit for detecting ON / OFF of a switch of a light dedicated to illumination provided in the vehicle, and turning off the backlight when a detection result of the light switch detection circuit indicates OFF. 2. The vehicle-mounted video display device according to claim 1, further comprising: a backlight control unit that brings the backlight into an ON state when the detection result of the light switch detection circuit indicates ON. 3. A screen orientation detecting means for detecting whether or not the screen of the liquid crystal display faces a predetermined direction and operating the switch means based on the detection result. Item 1. The in-vehicle image display device according to Item 1.