JP2008302901A - Vehicular display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular display device capable of preventing a battery from becoming in the over-discharge state even if an ignition switch is left to stand in the OFF state and at least one of getting on/off door and a baggage room door is left to stand in the opened state. <P>SOLUTION: When the ignition switch 10 is in the OFF state, it is detected that a door of the automobile is in the opened state by a door switch 3, a door indicator D is formed on a picture of a liquid crystal display unit 1 as an image, and light-emission display is performed by lighting a back light 2. Thereafter, even if the opened state of the door is continuously maintained, when 30 minutes is passed after detection of the door opened state by the door switch 3, the back light 2 is turned off. Thereby, in the OFF state of the ignition switch 10, i.e., in the state that the battery is not charged, by lighting the back light 2 for a long period of time, the battery 11 can be prevented from being exhausted and the life can be prevented from being shortened. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle display device that displays a meter, various warning displays, and the like as an image formed on a liquid crystal display, and is suitable for use in, for example, an automobile.

As a conventional vehicle display device, for example, an apparatus having a configuration for displaying a meter, various warning displays, and the like as an image formed on a liquid crystal display has been proposed (see Patent Document 1).
JP 2004-157434 A

  In a conventional vehicle display device, the entire display area is constituted by a display screen of a liquid crystal display. For this reason, the number of light sources constituting a backlight for transmitting and illuminating the liquid crystal display is also large. Therefore, the power consumption of the backlight during the display operation of the liquid crystal display is large.

  In general, in a display device for a vehicle, even when the ignition switch is in an OFF state, when the passenger door or the luggage compartment door is opened and opened, at least the passenger door and the luggage compartment door A warning display to warn the driver that one is in an open state is lit. This warning display is formed on the screen of the liquid crystal display, and the backlight is turned on in order to display the light emission.

  By the way, in a car, when the driver opens the car door and the ignition switch is turned off and the door is left open, the above warning display formed on the liquid crystal display of the vehicle display device emits light. Continue to be displayed. That is, the backlight is left in a lit state. In the conventional vehicle display device, the current consumption when the backlight is lit is large. Therefore, when the ignition switch is OFF, that is, when the engine is stopped and the battery is not charged, the amount of discharge from the battery increases. May become overdischarged. However, in the above-mentioned patent documents, a method for preventing the battery from being overdischarged when the ignition switch is in the OFF state and at least one of the passenger door and the luggage compartment door is left open. There is no description about.

  The present invention has been made in view of the above problems, and the battery is overdischarged when the ignition switch is in an OFF state and at least one of the passenger door and the luggage compartment door is left open. An object of the present invention is to provide a vehicle display device that can prevent this.

  In order to achieve the above object, the present invention employs the following technical means.

  The vehicle display device according to claim 1 of the present invention is a liquid crystal display, a light source for transmitting and illuminating the liquid crystal display, control means for performing on / off control of the light source and display control of the liquid crystal display. And a detecting means for detecting a vehicle state and outputting a warning signal when the state should alert the driver, and the control means emits from the detecting means when the ignition switch is OFF. When the warning signal is input, the liquid crystal display is driven to form a warning image and the light source is turned on, and the light source is turned off when a predetermined time elapses while the warning signal is being input and the warning signal is input. When the ignition switch is OFF and the input of the warning signal is stopped, the driving of the liquid crystal display is stopped and the light source is turned off when the light source is on. It is characterized in that.

  According to the above-described configuration, when a warning signal is issued when the ignition switch is in the OFF state, a warning image is formed on the liquid crystal display and the light source is turned on, so that the warning image is emitted and displayed. When the predetermined time has elapsed, the light source is turned off. This provides a vehicle display device capable of preventing the battery from being overdischarged due to power consumption by the light source for transmitted illumination of the liquid crystal display when the ignition switch is in an OFF state and a warning signal is continuously issued. can do.

  In the vehicle display device according to claim 2 of the present invention, the state is an open / closed state of at least one of a passenger door and a luggage door provided in the vehicle, and the detection means is at least one of the passenger door and the luggage door. One of the door switches detects an open / closed state, and the door switch is characterized in that when a boarding door or a luggage door to be detected is in an open state, it is detected and a warning signal is issued.

  The open / closed state of the vehicle door is one of important information to be confirmed by the driver. Therefore, even when the ignition switch is in the OFF state, when the door is in the open state, a warning display is generally performed on the vehicle display device by a light emission display or the like. In addition, when the ignition switch is OFF, the door is frequently left open for a long time. For example, when the ignition switch is turned off, that is, when loading / unloading a load with the engine stopped, or when making a call without closing the door completely.

  According to the configuration of the display device for a vehicle according to claim 2 of the present invention, when at least one of the passenger door and the luggage door is left open when the ignition switch is in the OFF state, the liquid crystal A warning image is formed on the display and the light source is turned on, and the warning image is emitted and displayed. However, the light source is turned off when a predetermined time elapses. As a result, when the ignition switch is in the OFF state and at least one of the passenger door and the luggage compartment door is left open, the battery is overdischarged due to the power consumption by the light source for transmitted illumination of the liquid crystal display. It is possible to provide a vehicular display device that can prevent the above.

  Below, the case where the display apparatus for vehicles by one Embodiment of this invention is applied to the combination meter 20 mounted in a motor vehicle is demonstrated based on drawing as an example.

  The combination meter 20 is arranged in an instrument panel in front of the driver's seat in the vehicle interior, and displays information necessary for driving the vehicle and information on the operating state of each part of the vehicle for the driver. The combination meter 20 includes the liquid crystal display 1 and displays all the above-described various information as an image formed on the liquid crystal display 1. In other words, the combination meter 20 includes only the liquid crystal display 1 as display means for displaying information.

  On the display screen of the liquid crystal display 1, as shown in FIG. 1, a speedometer S for instructing the traveling speed of the automobile, a tachometer T for instructing the rotational speed of the engine, a water thermometer W for instructing the engine cooling water temperature, A fuel meter F or the like that indicates the amount of remaining fuel in the fuel tank is formed. Furthermore, on the display screen of the liquid crystal display 1, as shown in FIG. 1, when it is detected that the state of each part of the automobile is a state that should alert the driver, the driver is notified of this. The various warning display images are formed. For example, a door indicator D for informing that the passenger door provided in the automobile is in an open state, an upper beam indicator H for instructing that the light control switch is switched to the upper beam position, and the like are displayed. In FIG. 1, the speedometer S, the tachometer T, the water temperature gauge W, the fuel meter F, the door indicator D, and the upper beam indicator H are all drawn for ease of understanding, but in reality, the speedometer S, the tachometer T, water temperature meter W, and fuel meter F are displayed only when the ignition switch is in the ON state. Further, the door indicator D and the upper beam indicator H are displayed only when the respective conditions are satisfied. Furthermore, the door indicator D is displayed when the door is opened even when the ignition switch is OFF. In this case, a door indicator D as a warning image is formed on the liquid crystal display 1 and the backlight 2 is turned on. Thereby, the door indicator D is lit and displayed.

  As the liquid crystal display 1, for example, a TFT (Thin Film Transistor) type dot matrix type liquid crystal panel is used. The liquid crystal display 1 is illuminated and displayed by a backlight 2 which is a light source disposed behind (right side in FIG. 2). Specifically, the backlight 2 is a liquid crystal display that emits light emitted from the light emitting diode (not shown) that converts the supplied power into light and the light emitted from the light emitting diode over the entire area of the liquid crystal display 1 with uniform brightness. It is comprised from the light guide (not shown) guided to the back surface of the vessel 1. The light guide is made of a translucent material such as a colorless and transparent acrylic resin or polycarbonate resin. In order for the backlight 2 to transmit and illuminate the entire area of the liquid crystal display 1 with uniform and sufficient brightness, a plurality of light emitting diodes are used.

  The warning display of the door indicator D described above is performed based on a detection signal issued from the door switch 3 which is a detection means for detecting the open / closed state of the door of the automobile. As the door switch 3, for example, a simple push button switch is used. When the door of the automobile is in the closed state, the electric circuit of the push button switch is closed. Therefore, the voltage level of the detection signal input from the door switch 3 to the controller 4 as the control circuit becomes “high”. On the other hand, when the door of the automobile is in an open state, the electric circuit of the push button switch is opened, and therefore the voltage level of the detection signal input from the door switch 3 to the controller 4 which is a control circuit becomes “low”. . That is, when the voltage level of the detection signal from the door switch 3 is “low”, this detection signal becomes a warning signal. The door switch 3 is individually attached to all the entrance doors provided in the automobile. Some automobiles include a luggage door in addition to the entry / exit door. For example, a vehicle such as a station wagon type or a van type. In this case, the door switch 3 is also attached to the luggage door.

  The door being in the closed state means a state in which the door locking mechanism provided in the automobile completely locks the door. On the other hand, the door is in the open state, which means that the door is closed, in addition to the state in which the passenger can get on and off, or the state in which the load can be loaded and unloaded. The case where the locking state of the locking mechanism is incomplete (so-called half-door state) is also included. The door switch 3 detects the open / close state of the door described above, and does not detect the locked state of the door.

  Next, the electric circuit configuration of the combination meter 20 according to one embodiment of the present invention will be described based on the electric circuit configuration diagram shown in FIG.

  The controller 4 which is a control means for performing display control of the liquid crystal display 1 and lighting / extinguishing control of the backlight 2 is composed of, for example, a microcomputer. The controller 4 is always connected to the battery 11 as shown in FIG. Moreover, the controller 4 is connected so that the ignition switch 10 can detect ON / OFF. The controller 4 is connected to the liquid crystal display 1 and the backlight 2 that are the objects to be driven by the controller 4. Further, the controller 4 detects a vehicle speed sensor 5 that detects the traveling speed of the automobile, a rotation sensor 6 that detects the rotational speed of the engine, a temperature sensor 7 that detects the engine coolant temperature, and a remaining fuel amount in the fuel tank. A liquid level sensor 8 and a light control switch 9 for detecting that the headlamp is lit with the upper beam are connected to be able to input respective detection signals. A door switch 3 for detecting the open / closed state of the door of the automobile is connected to the controller 4 so that a detection signal can be input. The vehicle on which the combination meter 20 according to an embodiment of the present invention is mounted is a station wagon type, and includes four entrance doors on the side of the vehicle body and one luggage door on the rear surface of the vehicle body. Therefore, five door switches 3 are connected.

  Next, the door indicator D warning display process, that is, the door open state warning display process, which is a feature of the combination meter 20 according to the embodiment of the present invention configured as described above, will be described with reference to the flowchart of FIG. explain. FIG. 3 is a flowchart showing a specific processing procedure of the door open state warning display process executed by the controller 4 when the ignition switch 10 is in the OFF state. When the ignition switch is in the ON state, the backlight 2 is continuously lit, and the door open state warning display process is simply performed based only on the detection signal from the door switch 3.

  When the automobile door is opened when the ignition switch 10 is in the OFF state, in the case of the automobile provided with the combination meter 20 according to the embodiment of the present invention, any one of the four entrance doors and the one luggage door When the door is opened, the detection signal of the door switch 3 installed in the door becomes “low” level, the controller 4 detects it, and the door open state warning display process shown in FIG. 3 is started. When this process is started, the controller 4 first executes an initialization process in step 101.

  Subsequently, in step 102, the controller 4 determines the state of the ignition switch 10, that is, determines whether or not the ignition switch 10 is OFF. If the result of determination in step 102 is that the ignition switch 10 is OFF, it is determined in subsequent step 103 whether or not the signal from the door switch 3 is a warning signal. If the result of determination in step 102 is that the ignition switch 10 is ON, the controller 4 ends the door open state warning display process.

  Next, as a result of the determination in step 103, if the detection signal from the door switch 3 is “low”, that is, a warning signal, it is determined that the door is in an open state, and in step 104, the timer is timed. Determine whether or not. On the other hand, if the result of determination in step 103 is that the detection signal from the door switch 3 is “high”, that is, the door is in the closed state, the door indicator D is formed as an image on the liquid crystal display 1 as the processing of the subsequent step 110. If so, erase it. Subsequently, as the processing of step 111, if the backlight 2 is on, it is turned off. Thereafter, the controller 4 ends the door open state warning display process.

  Next, if the result of determination in step 104 is that timer timing is not in progress, timer timing is started as the processing of subsequent step 105, and then the door indicator D is formed as an image on the liquid crystal display 1 as processing of step 106. Let On the other hand, if the result of determination in step 104 is that timer timing is already in progress, processing proceeds to step 106 without performing step 105.

  Next, as a process subsequent to step 106, the backlight 2 is turned on in step 107. As a result, a door indicator D is formed on the screen of the liquid crystal display 1 and is lit and displayed.

  Next, as a process following step 107, it is determined in step 108 whether or not the timer time has exceeded 30 minutes. If the result of determination in step 108 is that the timer time is less than 30 minutes, the processing from step 102 is repeated again. On the other hand, if the result of determination in step 108 is that the timer timing exceeds 30 minutes, the controller 4 turns off the backlight 2 in step 109 and ends the door open state warning display processing.

  In the combination meter 20 according to the embodiment of the present invention described above, when the ignition switch 10 is in the OFF state, the door switch 3 detects that the door of the automobile is in the open state, and the liquid crystal display 1 As shown in FIG. 1, a door indicator D is formed as an image on the screen, and the backlight 2 is turned on to emit light. After that, when the door open state continues continuously, the backlight 2 is turned off when 30 minutes have elapsed after the door switch 3 detects the door open state. Thereby, in the OFF state of the ignition switch 10, that is, the state where the battery 11 is not charged, it is possible to prevent the battery 11 from being consumed and shortening the life by turning on the backlight 2 for a long time.

  In the combination meter 20 according to the embodiment of the present invention described above, when the ignition switch 10 is in the OFF state, the door switch 3 detects that the door of the automobile is open, and then the backlight 2 is turned on. Although it takes 30 minutes to turn off the light, it is not necessary to limit this time to 30 minutes, and it may be changed as necessary.

It is a front view of the combination meter 20 by one Embodiment of this invention. 3 is a schematic diagram for explaining an electric circuit configuration of the combination meter 20. FIG. It is a flowchart explaining the display control of the door indicator D.

Explanation of symbols

1 Liquid crystal display 2 Backlight (light source)
3 Door switch (detection means)
4 Controller (control means)
DESCRIPTION OF SYMBOLS 5 Vehicle speed sensor 6 Rotation sensor 7 Temperature sensor 8 Liquid level sensor 9 Light control switch 10 Ignition switch 11 Battery 20 Combination meter (vehicle display device)
D Door indicator F Fuel gauge H Upper beam indicator S Speedometer T Tachometer W Water temperature gauge

Claims (2)

A liquid crystal display,
A light source for transmitting and illuminating the liquid crystal display;
Control means for performing on / off control of the light source and display control of the liquid crystal display;
Detecting means for detecting a state of the vehicle and outputting a warning signal when the state is a state that should alert the driver;
The control means drives the liquid crystal display to form a warning image and turn on the light source when the warning signal issued from the detection means is input when the ignition switch is in an OFF state. When the warning signal is being input and a predetermined time has elapsed after the warning signal input is started, the light source is turned off,
The control means stops driving the liquid crystal display when the input of the warning signal is stopped when the ignition switch is OFF, and turns off the light source when the light source is turned on. A display device for a vehicle, characterized in that: The state is an open / closed state of at least one of a passenger door and a luggage door provided in the vehicle,
The detecting means is a door switch for detecting an open / closed state of at least one of the entrance door and the luggage door;
2. The vehicle display device according to claim 1, wherein the door switch detects the entry / exit door or the luggage door to be detected and issues the warning signal when the door is in an open state.

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