JPH0544703U - In-vehicle device display device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a display device in which the brightness of the display device is adjusted according to the brightness of the surroundings so that an image is easy to see and eyes are not tired. [Configuration] When both the headlamp and the room light are off, the brightness of the display device is set to the first brightness of normal brightness, and when the headlamp is turned on, the brightness of the display device is set to the first brightness. When the second brightness, which is darker than the brightness, is set and the room light is turned on, the brightness of the display device is set to the first brightness which is the normal brightness regardless of whether the headlamp is turned on.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a display device used in a vehicle-mounted television receiver or a navigation system, and more particularly to a brightness adjusting device that automatically adjusts the brightness of the display device according to the ambient brightness.

[0002]

[Prior Art]

 A television receiver that uses an AC power supply is provided with a bright controller that adjusts the brightness according to the brightness of the surroundings. This is to detect the brightness of the surroundings by a light-receiving element installed in the receiver and adjust the brightness so that the brightness of the display device is increased when the surroundings are bright and the brightness is decreased when the surroundings are dark. , An ergonomically designed function.

Further, in a vehicle-mounted CRT display device, a headlight is lit during traveling at night. Therefore, if the information for lighting the light is given to a brightness control circuit to reduce the brightness, the ambient brightness is reduced. Accordingly, the brightness can be substantially adjusted, and the light receiving element can be omitted.

[0004]

[Problems to be solved by the device]

 However, the above-mentioned display device for in-vehicle equipment supplies the information for headlight lighting to the brightness adjustment circuit and lowers the brightness at night when the surroundings are dark, so the room light is turned on to make the vehicle interior brighter. In this case, there is a problem that the projected image is extremely difficult to see because the brightness of the display device is still reduced even though the surroundings have become brighter.

The present invention has been made in view of the above circumstances. The lighting information of the headlight and the lighting information of the room light are simultaneously given to the control unit, and the brightness of the display device is finely adjusted to make the image easy to see. It is an object of the present invention to provide an in-vehicle image display device that does not cause eyestrain.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the display device for an on-vehicle device of the present invention, the first brightness information is read from the ROM memory of the device and the brightness adjustment circuit is provided when the headlamp and the room light of the vehicle are both off. The first brightness is set, and when the headlamp is turned on, the second brightness information is read from the ROM, and the brightness adjustment circuit is set to the second brightness darker than the first brightness, and the room light of the room light is set. A control device is provided for setting the brightness adjusting circuit to the first brightness when the headlamp is turned on regardless of whether the headlamp is turned on or off.

[0007]

[Action]

 The microcomputer controller constantly monitors the open / closed status of the headlight switch and room light switch. When both of these two switches are open, the display is based on the first brightness information read from the ROM memory. Set the device to normal brightness. When the headlamp switch is turned on (closed) and the headlamp is turned on, the second luminance information is read from the ROM memory, and the display device is set to the second luminance which is darker than the first luminance. When the room light switch is turned on and the room light is turned on, the first brightness information is read out and the display device is set to the first brightness regardless of whether the headlamp is on or off.

[0008]

【Example】

 Hereinafter, a display device of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 11 is a switch for lighting and operating a room light, and 12 is a switch for lighting a headlamp. These switches 11 and 12 supply the battery power B + connected to the power supply terminal 10 to the room light 13 and the headlamp 14, respectively. Reference numeral 16 denotes a microcomputer control unit for controlling each circuit and mechanism of the display device. One of the input ports IP1 is a ROM memory so that the information read from the ROM memory 15 for storing the information about the luminance data is input. 15 is connected. Further, the other input port IP2 is connected to the output of the room light switch 11 and the input port IP3 is connected to the output of the headlamp switch 12 so that switch on / off information is inputted respectively. A brightness adjusting circuit 17 is connected to the output port OP1 of the microcomputer 16 and controlled to adjust the brightness voltage supplied to the CRT display device 18 in the next stage.

FIG. 2 is a flow chart for explaining the operation of the present invention. Next, this operation will be described with reference to FIGS. First, when both the room light switch 11 and the headlamp switch 12 are off, the microcomputer 16 gives the first brightness information to the brightness adjustment circuit 17 and controls it based on the brightness information read from the ROM memory 15. Then, the brightness adjustment circuit 17 sets a voltage based on the first brightness information and supplies this voltage to the CRT 18. Therefore, the CRT display device 18 displays the image at the first brightness, that is, the normal brightness. Here, the microcomputer 16 constantly monitors the open / closed states of the room light switch 11 and the headlamp switch 12, and unless the two switches 11 and 12 are operated, the display device displays an image at the first brightness. (S-1).

When any one of the above switches is operated in step (S-1), the open / closed state of the room light switch 11 is next determined (S-2). When the room light switch 11 is turned on (closed), the microcomputer 16 determines whether the currently set brightness is the first brightness or the second brightness (S-3).

When the currently set brightness is the second brightness that is darker than the first brightness, the microcomputer 16 newly reads the first brightness information stored in the ROM 15 and uses it as the first brightness information. Based on this, the brightness adjustment circuit 17 is controlled (S-4). Therefore, when the room light 13 is turned on, the CRT display device 18 is supplied with the first luminance voltage, and an image is displayed with normal brightness.

In step (S-2), when the operated switch is not the room light switch 11 but the room light switch 11 is off and the headlamp switch 12 is operated on (S-5), the same operation is performed. Then, it is determined whether the currently set brightness is the first brightness or the second brightness (S-6).

If the brightness as a result of the determination in step (S-6) is the first brightness, the microcomputer 16 reads the brightness information from the ROM 15 and controls the brightness adjusting circuit 17 to the second brightness. The display device will display the image at the second brightness which is darker than the first brightness (S-7). In step (S-5), when the headlamp switch 12 is off and the room light switch is also off, the brightness currently being set is again on either the first or second side. It is determined (S-8).

If the brightness in step (S-8) is the second brightness, the ROM information is read, the display device is changed to the first brightness, and the process is terminated (S-9). As described above, when both the headlamp 14 and the room light 13 are in the off state, the brightness of the display device is set to the first brightness of the normal brightness, but when only the headlamp is turned on, the first brightness is set to the first brightness. The second brightness, which is darker than the brightness, is set, and when the room light is on, the first brightness is set regardless of whether the headlamp is on or off.

Therefore, in this embodiment, the light receiving element for detecting the ambient brightness like the conventional device can be omitted, so that the cost of the device can be suppressed, and the brightness is reduced at night when the headlamp is turned on. Since the brightness of the display device is switched as described above, eyestrain is not caused, and when the room light is turned on and the surroundings become bright, the brightness is increased to make it easier to see.

If a RAM memory is added to the ROM memory provided in the apparatus of this embodiment, the operator can freely set the brightness according to his or her preference.

[0017]

[Effect of the device]

 As described above, according to the display device for a vehicle-mounted device of the present invention, the display device is set to the first brightness when both the headlamp and the room light are off, and the display device is set when the headlamp is lit. Is set to a second brightness that is darker than the first brightness, and when the room light is turned on, a control unit that sets the display device to the first brightness regardless of whether the headlamp is turned on or off is provided. The brightness is automatically switched so that the brightness is reduced according to the darkness of the surroundings at night when the lights are turned on, and when the room light is turned on, the brightness is automatically set to the normal brightness according to the brightness of the surroundings. It is expected that the images displayed on the screen will be easy to see and that the eyes will not be tired.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flow chart illustrating the operation of the present invention.

[Explanation of symbols]

 11 Room Light Switch 12 Head Lamp Switch 13 Room Light 14 Head Lamp 15 ROM Memory 16 Microcomputer Control Unit 17 Brightness Adjustment Circuit 18 CRT Display Device

Claims (1)

[Scope of utility model registration request] 1. A display device for displaying output images of various video equipment mounted on a vehicle, wherein when a headlamp and a room light of the vehicle are both in an off state, the first luminance is read from a ROM memory of the video equipment. Information is read to set the brightness adjustment circuit to the first brightness, and when the headlamp is turned on, second brightness information is read from the ROM and the brightness adjustment circuit is set to a second brightness darker than the first brightness. And a controller for setting the brightness adjustment circuit to the first brightness when the room light is turned on regardless of whether the headlamp is turned on or off.