JPH11334414A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device wherein a pointer is not conspicuous when an analog display is changed from a non-display state to a display state. SOLUTION: A first display has a pointer and a display plate. The pointer is rotated by a pointer driving means 20. The first display displays a physical quantity by causing a painter instruction part to instruct the display plate. A second display displays the same physical quantity as that of the first display in numerical values. A light source 24 for illuminating the instruction part by a light is disposed in the pointer of the first display. One of the first and second displays is changed to a display state by a switching means 26, and the other to a non-display state. A control means 27 delays the lighting of the light source 24 when the first display is switched from the non-display state to the display state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a display device having a display provided with a light emitting type pointer.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS.
There is a display device for a vehicle in which a digital speedometer 1 and an analog tachometer 2 are juxtaposed. The digital speedometer 1 is composed of a light-emitting display device such as a fluorescent display tube, and displays the speed of a vehicle by numbers. The analog tachometer 2 has a pointer 3 and a display plate 4 and an indicator 5 (scale,
The number of revolutions of the engine is displayed by designating a numeral or the like with the indicator 6 of the pointer 3. A cold-cathode tube (not shown) is provided behind the display panel 4, and the light of the cold-cathode tube is transmitted through the indicator 5 of the display panel 4. A light-emitting diode (not shown) is embedded in the indicator 6 of the pointer 3, and the indicator 6 is configured to shine when the light-emitting diode is turned on.

[0003]

The digital speedometer 1 is always in a display state when the power supply of the vehicle display device is turned on. On the other hand, the analog tachometer 2 can select a non-display state (see FIG. 7) or a display state (see FIG. 8) by operating a switch (not shown). Switching to the display state is performed by a cold-cathode tube and pointer 3 by operating a switch.
Is performed by the light emitting diode. When the analog tachometer 2 is in the non-display state, the hands 3 are stationary at the zero point regardless of the rotation speed, and the cold-cathode tube illuminating the display plate 4 is turned off. A smoke cover (not shown) is provided in front of the display panel 4 so that the display panel 4 is not visible when the cold cathode fluorescent lamp is turned off. However, when the analog type tachometer 2 is switched from the non-display state to the display state, the pointer 3 rapidly rotates from the zero point to the designated position, so that the rotation speed is not changed even though the engine speed does not fluctuate. There is a problem that the number is displayed as if it has risen sharply from zero, and the observer feels uncomfortable. The present invention has been made in view of this problem,
It is an object of the present invention to provide a display device in which the hands are not noticeable when the analog display is switched from a non-display state to a display state.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a display having a pointer having an indicator and a display board indicated by the indicator, a light source for shining the indicator, Switching means for switching the display to a display state or a non-display state; and control means for delaying lighting of the light source when switching the display from the non-display state to the display state.

Further, the present invention provides a first display for displaying a physical quantity having a pointer having an indicating section and a display panel indicated by the indicating section, a light source for shining the indicating section, and A second display for displaying numbers, a switching unit for switching one of the first display and the second display to a display state and the other to a non-display state, and non-display of the first display Control means for delaying lighting of the light source when switching from the state to the display state.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first display 9 has a pointer 11 and a display plate 13. The pointer 11 is rotated by the pointer driving means 20. The first indicator 9 is the indicator 1 of the pointer 11
2 indicates the physical quantity by indicating the display board 13. The second display unit 10 displays the same physical quantity as the first display unit 9 by a numeral. A light source 24 for illuminating the indicator 12 is provided on the pointer 11 of the first display 9. One of the first display 9 and the second display 10 can be switched by the switching means 26 to the display state and the other to the non-display state. The control means 27 delays the lighting of the light source 24 when switching the first display 9 from the non-display state to the display state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a display device for a vehicle will be described below with reference to the accompanying drawings.

FIG. 2 is a front view of the display device. Reference numeral 7 denotes an instrument housing. The instrument housing 7 accommodates the digital speedometer 8, the analog tachometer 9 (first display), and the digital tachometer 10 (second display). ing. The analog tachometer 9 is the indicator 1 of the pointer 11
Numeral 2 designates an index portion 14 (scales, numbers, etc.) of the display plate 13, and displays the engine speed (physical quantity). The digital speedometer 8 comprises a fluorescent display tube, and displays the speed of the vehicle by two sets of Japanese character segments. The digital tachometer 10 includes a fluorescent display tube, and displays the number of revolutions of the engine by four sets of Japanese character segments.

FIG. 3 is a sectional view of the display device. Reference numeral 15 denotes a facing, and the facing 15 has a locking claw (not shown).
Are provided, and the instrument housing 7 is
It is locked to. Reference numeral 16 denotes a smoke cover. The smoke cover 16 is made of a translucent resin (for example, acrylic). The smoke cover 16 is provided with a locking claw (not shown), which is locked to the facing 15 by the locking claw. Reference numeral 17 denotes a half mirror, and the half mirror 17 is disposed in front of the pointer 11 at an angle of approximately 45 degrees with respect to the display panel 13. The smoke cover 16 is provided in front of the half mirror 17.

Reference numeral 18 denotes a liquid crystal display, and the display light L projected by the liquid crystal display 18 is projected on the half mirror 17. The liquid crystal display 18 includes a TFT (thin film transistor) liquid crystal display element in which a number of pixels are arranged in a matrix, and a light source for illuminating the liquid crystal display element from behind. The liquid crystal display 18 can display various characters, figures, and the like, and displays, for example, route guidance information. Reference numeral 19 denotes a circuit board on which the liquid crystal display 18 is mounted.

Reference numeral 20 denotes a stepping motor (a pointer driving means). The stepping motor 20 is housed in the instrument housing 7. The stepping motor 20 has a rotating shaft 21, and the end of the rotating shaft 21 has a pointer 11.
Is fixed. A bulb 22 illuminates the display panel 13 from behind. The valve 22 is fixed to the bottom wall of the instrument housing 7 and is connected to a flexible wiring board 23 provided on the rear surface of the bottom wall.

FIG. 4 is a sectional view of the pointer 11. Guideline 11
Is a translucent resin (for example, polycarbonate)
It consists of Reference numeral 24 denotes a light emitting diode (light source). The light emitting diode 24 irradiates the indicator 12 with light. Reference numeral 25 denotes a reflection layer.
2, and reflects the light of the light emitting diode 24 forward.

Next, control of the display device will be described with reference to the block diagram shown in FIG. Reference numeral 26 denotes a switch (switching means), and the switch 26 outputs a signal for switching a display mode to a microcomputer (control means). Reference numeral 28 denotes a rotation sensor which outputs a rotation speed signal to the microcomputer 27. A speed sensor 29 outputs a speed signal to the microcomputer 27. Reference numeral 30 denotes a navigation device.
Outputs route guidance information to the microcomputer 27.

The bulb 22 and the light emitting diode 24 are connected to a microcomputer 27 via lighting circuits 31 and 32, respectively. Further, the stepping motor 20, the digital tachometer 10, the digital speedometer 8 and the liquid crystal display 18 are connected to the microcomputer 2 via drive circuits 33, 34, 35 and 36, respectively.
7 is connected.

The user of the display device for a vehicle can use the switch 26.
Is operated to display the first display mode (see FIG. 5).
Alternatively, the second display mode (see FIG. 6) can be selected. The first display mode is a display mode in which the analog tachometer 9 is in a display state (hereinafter, referred to as ON), the digital tachometer 10 is in a non-display state (hereinafter, referred to as OFF), and the liquid crystal display 18 is OFF. It is. In the second display mode, the analog tachometer 9 is off, the digital tachometer 10 is on,
This is a display mode in which the liquid crystal display 18 is turned on. In addition,
The digital speedometer 8 is on in each display mode.

In the second display mode, the pointer 11 stops at the zero point, and the bulb 22 and the light emitting diode 24 are turned off. When the first display mode is selected, the bulb 22 is turned on immediately after the switch 26 is operated, and the light emitting diode 24 is turned on a predetermined time (for example, 0.5 seconds) after the switch 26 is operated. That is, when switching the analog tachometer 9 from off to on, the microcomputer 27 delays the lighting of the light emitting diode 24. Therefore, when switching from the second display mode to the first display mode, the pointer 1
Although 1 starts rotating from the zero point, the light emitting diode 24 is turned off and the pointer 11 is not conspicuous.

In this embodiment, the lighting of the light emitting diode 24 is delayed by a predetermined time. Therefore, for example, when the second display mode is selected when the engine speed is 6000 rpm, the light emitting diode 24 may be turned on before the pointer 11 indicates 6000 rpm, but at least the rotation from the zero point is started. The light emitting diode 24 is turned off for a predetermined time from the start, and the hands 11 are inconspicuous. A detecting means for detecting the rotation angle of the pointer 11 is provided, and until the pointer 11 reaches a desired position, the light emitting diode 24
May be configured to delay the lighting of.

In this embodiment, the pointer driving means is the stepping motor 20, but may be, for example, a cross coil type movement. The light source for illuminating the display panel 13 from behind is the bulb 22, but may be, for example, a cold cathode tube. Further, the display device for a vehicle of the present embodiment has the analog tachometer 9 and the digital tachometer 10, but the digital tachometer 10 may not be provided.
Further, the half mirror 17 and the liquid crystal display 18 may not be provided.

[0019]

According to the present invention, there is provided a display having a pointer having an indicating portion and a display plate indicated by the indicating portion, a light source for shining the indicating portion, and setting the display to a display state or a non-display state. Switching means for switching, and control means for delaying lighting of the light source when the display is switched from the non-display state to the display state, wherein when the display is switched from the non-display state to the display state, The pointer is inconspicuous because the light source is off.

Further, the present invention provides a first indicator for displaying a physical quantity having a pointer having an indicator and a display plate indicated by the indicator, a light source for illuminating the indicator, A second display for displaying numbers, a switching unit for switching one of the first display and the second display to a display state and the other to a non-display state, and non-display of the first display Control means for delaying the lighting of the light source when switching from the state to the display state, and the light source is turned off when the first display is switched from the non-display state to the display state. Is not noticeable.

[Brief description of the drawings]

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

FIG. 2 is a front view of the display device showing the embodiment.

FIG. 3 is a sectional view of a display device showing the embodiment.

FIG. 4 is a sectional view of a pointer showing the embodiment.

FIG. 5 is an explanatory diagram of a first display mode showing the embodiment.

FIG. 6 is an explanatory diagram of a second display mode showing the embodiment.

FIG. 7 is a front view of a display device showing a conventional example.

FIG. 8 is a front view showing the conventional example.

[Explanation of symbols]

 Reference Signs List 9 analog tachometer (first display) 10 digital tachometer (second display) 11 pointer 12 indicator 13 display board 24 light emitting diode (light source) 26 switch (switching means) 27 microcomputer (control means)

Claims (2)

[Claims] 1. A display having a pointer having an indicator and a display board indicated by the indicator, a light source for illuminating the indicator, and switching means for switching the display to a display state or a non-display state. Control means for delaying lighting of the light source when switching the display from the non-display state to the display state. 2. A first indicator for displaying a physical quantity, comprising a pointer having an indicator, and a display board indicated by the indicator,
A second display for displaying the physical quantity by a number, a light source for illuminating the indicating unit, and a switch for switching one of the first display and the second display to a display state and the other to a non-display state. And a control unit for delaying lighting of the light source when the first display is switched from a non-display state to a display state.