FR2799008A1 - Car head up display (HUD) having internal display screen illuminating windscreen with two position rotating mirrors having first position sunlight illuminating display and second optical source illumination - Google Patents

Car head up display (HUD) having internal display screen illuminating windscreen with two position rotating mirrors having first position sunlight illuminating display and second optical source illumination Download PDF

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Publication number
FR2799008A1
FR2799008A1 FR0011606A FR0011606A FR2799008A1 FR 2799008 A1 FR2799008 A1 FR 2799008A1 FR 0011606 A FR0011606 A FR 0011606A FR 0011606 A FR0011606 A FR 0011606A FR 2799008 A1 FR2799008 A1 FR 2799008A1
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FR
France
Prior art keywords
gt
lt
display device
reflecting mirror
position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR0011606A
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French (fr)
Inventor
Naohito Kanamori
Satoru Tamura
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Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP27472799A priority Critical patent/JP2001097073A/en
Application filed by Denso Corp filed Critical Denso Corp
Publication of FR2799008A1 publication Critical patent/FR2799008A1/en
Withdrawn legal-status Critical Current

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0149Head-up displays characterised by mechanical features
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/1821Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors for rotating or oscillating mirrors
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0118Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/014Head-up displays characterised by optical features comprising information/image processing systems
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0149Head-up displays characterised by mechanical features
    • G02B2027/0154Head-up displays characterised by mechanical features with movable elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0149Head-up displays characterised by mechanical features
    • G02B2027/0154Head-up displays characterised by mechanical features with movable elements
    • G02B2027/0156Head-up displays characterised by mechanical features with movable elements with optionally usable elements

Abstract

The head up display has a display screen (11) which passes light information using a reflecting mirror (50) to a windscreen (20) at head height. The reflecting mirror can be set to two positions. In the first position light from the sun is reflected from the mirror surface (51) to illuminate the display mechanism. In the second position, rear optical illumination is used.

Description

HEAD-UP VISUALIZATION WITH ROTARY REFLECTIVE MIRROR Description This invention relates to a head-up display for a vehicle.

JP-A-11-23 <B> 997 </ B> describes a head-up visualization for <B> to </ B> a vehicle. In the head-up display, a liquid crystal panel is positioned at one side of the back surface of a dashboard at the inside of the dashboard. a vehicle compartment, and light emitted by a rear light and the liquid crystal panel is reflected by a reflecting mirror to a windshield to project an image on the front of the window. breaks so that a driver can observe the image as information.

In the head-up visualization, a filter is provided between the reflective mirror and the liquid crystal panel to protect the liquid crystal panel from thermal rays when the light is exposed. sun is incident on the windshield. The filter allows visible rays from the liquid crystal panel to pass through to the reflecting mirror, while preventing the thermal rays, reflected by the reflecting mirror, from crossing to the <B> panel at </ b>. B> liquid crystals.

This filter is however very expensive because the filter must intercept light having a specific wavelength. This results in an increase in the cost of head-up visualization. In addition, the filter is capable of intercepting light having a specific wavelength that simultaneously intercepts light from the liquid crystal panel, thus reducing the brightness of the display on the screen. windshield.

The present invention has been made in view of the above problems. An object of the present invention is to provide a head-up display for a vehicle, comprising a reflecting mirror which reflects light from a display device to a vehicle. a windshield while preventing sunlight from being incidentally incident on the display device through the windshield, without an additional optical element.

According to the present invention, a head-up display for a vehicle comprises a reflecting mirror rotatably disposed on the front of a display device and having a reflective surface which faces the display device for receiving light from the display device and reflecting light to a windshield. The reflecting mirror is rotated in a particular condition to be set <B> to </ B> one of a first position and a second position. The reflective mirror established at the first position has the reflective surface which reflects sunlight, which is incident on the reflecting mirror after passing through the windshield, to a peripheral portion of the display device. to prevent sunlight from entering the display. The reflecting mirror set <B> to </ B> the second position has the reflective surface that does not receive sunlight from the windshield.

For example, the reflecting mirror is set <B> to </ B> one of the first position and the second position when the key intended to start the vehicle is turned, when the display is set in a non-functional state in which the light output of the display device is stopped, or when an elevation gradient determination means determines that a temperature rise gradient of the display panel represents a specific value.

As a result, sunlight is prevented from being incidentally incident on the display device without the use of additional optical element such as a filter which can reduce the brightness of the display. That is, the head-up display compliant with the present invention can be manufactured at low cost and with high brightness of the display. Other objects and features of the present invention will be more readily apparent from a better understanding of the preferred embodiments described below with reference to the following drawings in which La <B> > f </ B> igure <B> 1 </ B> is a schematic diagram representing the entire design of a head-up visualization intended to <B> to </ B> a vehicle, compliant <B> to </ B> a preferred embodiment of the present invention, Figs. 2B to 4 are side views respectively showing a rotational position adjusting device of the head-up display shown in Fig. 1 , </ B> with a reflecting mirror <B> at </ B> different positions, Figure <B> 5 </ B> is a block diagram showing a control circuit intended to <B> to </ B> a liquid crystal panel and an electric motor of the head-up visualization, Figure <B> 6 </ B> is a flowchart representing a first part of the computer program executed by the control circuit shown in Figure <B> 5, <B> 7 </ B> is a flowchart representing a second part of the program computer executed by the control circuit shown in Figure <B> 5, </ B> Figure <B> 8 </ B> is a graph showing a rise in temperature of the panel <B> to </ B> liquid crystal based on a time elapsed when sunlight is inversely incident on the <B> to </ B> liquid crystal panel, Figure <B> 9 </ B> is a simplified diagram showing a state where the light of the sun is inversely incident on the <B> to </ B> liquid crystal panel, Figure <B> 10 </ B> is a simplified diagram showing a state in which the inverse incidence of sunlight on the panel < B> to </ B> liquid crystal is prevented in the present embodiment according to <B> to </ B> the presse FIG. 11 is a simplified diagram showing the main parts of a head-up display as a modified example of the present embodiment, and FIG. 12 is a simplified diagram showing a state where an inverse incidence of sunlight on the <B> to </ B> liquid crystal panel is prevented in the modified example shown in the figure <B> il. </ B>

A preferred embodiment of the present invention is explained below with reference to Figures <B> 1 to </ B>. </ B> <B> 1 </ B> represents a state where a head-up display conforming to the present invention is installed in a vehicle.

The head-up visualization has a <B> to </ B> crystals panel. transparent liquid <B> 10. <B> to <B> 10 </ B> liquid crystal is vertically arranged using appropriate parts at a dash <B> 30 </ B> which extends from a lower edge portion of a windshield 20 to a passenger compartment downward. The head-up display further includes a light source 40 which serves as backlight for the <B> to </ B> liquid crystal panel <B> 10 </ B> to emit light to the <B> to </ B> liquid crystal panel <B> 10. </ B>

A reflecting mirror <B> 50 </ B> is positioned on a surface <B> il </ B> of <B> to </ B> liquid crystal <B> 10, </ B> and has an optical axis P common to the panel <B> to </ B> liquid crystal <B> 10 </ B> and <B> to </ B> the light source 40. The reflecting mirror <B> 50 </ B> consists of a convex mirror supported with the possibility of rotation by a rotation adjustment device <B> 70 </ B> on the front of the <B> to </ B> liquid crystal panel < B> 10 </ B> and under a waterproof cover <B> to </ B> the dust <B> 60. </ B> The waterproof cover <B> to </ B> the dust <B> 60 </ B> is made of transparent resin or glass, and mounts in an opening part <B> 32 </ B> defined in a top wall <B> 31 </ B> of the dashboard <B> 30. </ B>

When a reflecting surface <B> 51 </ B> of the reflecting mirror <B> 50 </ B> is turned <B> to </ B> both towards the waterproof cover <B> to </ B> the dust <B> 60 </ B> and the display area <B> it </ B> from the <B> panel to </ B> liquid crystal <B> 10 to </ B> a particular rotating position, the light emitted by the <B> to </ B> liquid crystal panel <B> 10 </ B> intended to <B> to </ B> display the information is directed to the reflecting mirror <B> 50 </ B> along the optical axis P, reflected by the reflecting mirror <B> 50 </ B> and then incident on the windshield 20 in the form of an image projection light after passing through the sealed cover <B > to </ B> the dust <B> 60. </ B> In other words, the reflecting mirror <B> 50 </ B> creates an image <B> 52 to </ B> from the information of display from <B> to </ B> <B> 10 </ B> as shown in Figure 1, and project <B> 52 </ B> onto the inner surface of the windshield e 20 around a point 20a. The windshield 20 causes the incident light, reflected by the reflecting mirror <B> 50, to enter the eyes of a conductor M through an upper space of a steering wheel W. This means that the driver M visually observes the information of the display in the form of an image 21 appearing on the front of the windshield 20.

As shown in Figure 2, the rotation adjuster <B> 70 </ B> has a device body <B> 71. </ B> The device body <B> 71 </ B> supports with the possibility of rotating the reflecting mirror <B> 50 </ B> by <B> to </ B> a rotating shaft <B> 72 </ B> via arm-shaped support elements ( not shown) at the central part of the mirror <B> 50 </ B> in a vertical direction, so that the reflecting mirror <B> 50 </ B> can rotate clockwise or in the opposite direction in Figure 2. The rotation adjustment device <B> 70 </ B> further comprises an electric motor <B> 73. </ B> The electric motor <B> 73 </ B> is <B> f </ B> ixed <B> to </ B> a sidewall of device body <B> 71 </ B> at the bottom of it to have an output shaft 73a extending perpendicularly and outward from the side wall. A pinion gear 74 is coaxially supported by the output shaft 73a of the electric motor 73 so that it can rotate on a parallel plane <B> 73 </ B> the side wall of the device body <B> 71 </ B> described above.

'A gear <B> to </ B> sector <B> 75 </ B> is supported, <B> to </ B> its center of rotation, coaxially by a rotation shaft 75a which protrudes with possibility of rotation and perpendicular to the <B> at </ B> the side wall of the device body <B> 71. </ B> The gear <B> to </ B> sector <B> 75 </ B> is geared by gear <B> to </ B> pinion 74 at a bow-shaped meshing portion <B> 75b </ B> provided at <B> at </ B> a circumference portion outer arc-shaped of it. Accordingly, gear <B> to </ B> sector <B> 75 </ B> rotates about rotational shaft 75a according to <B> at </ B> rotation of the gear <B> to pinion 74 in the opposite direction of gear to pinion 74.

The <B> to </ B> sector <B> 75 </ B> gear is formed of a locking portion 75c and a toothless portion 75d. The locking portion 75c is, as shown in Figs. 2 and <B> 3, formed <B> at </ B> one end of the arcuate outer circumference portion of the gear <B> to </ B> sector <B> 75. </ B> The locking portion 75c stops the rotation of the gear <B> to </ B> pinion 74 and the gear <B> to </ B> sector <B > 75 </ B> when the gear <B> to </ B> sector <B> 75 </ B> rotates clockwise to the position shown in Figure 2. The toothless part <B> 75d </ B> is formed <B> at </ B> the other end of the outer circumference portion of the gear <B> to </ B> sector <B> 75, </ B> and releases meshing between gear <B> to <B> 75 </ B> and gear <B> to </ B> gear 74 when the gear <B> to </ B> sector <B> 75 </ B> turns counterclockwise to the illustrated position e in Figure <B> 3. </ B>

A small diameter intermediate gear <B> 76 </ B> is coaxially supported by the rotational shaft 75a so that it rotates integrally with the <B> gear in </ b> sector < B> 75. </ B> The intermediate gear <B> 76 </ B> is engaged with an arcuate meshing portion 77a of another gear <B> to </ B> sector < B> 77. <B> Gear <B> to <B> 77 </ B> is fixedly supported by rotation shaft <B> 72 to </ B> its center of rotation corresponding to the center in the vertical direction of the reflecting mirror <B> 50. </ B> Accordingly, the gear <B> to </ B> sector <B> 77 </ B> rotates at the same time as the reflecting mirror <B> 50 </ B> according to <B> to </ B> the rotation of the rotating shaft <B> 72. </ B> A coil spring <B> 78 </ B> is installed between a part of the body of the <B> 71 </ B> device and the upper end portion of the reflecting mirror <B> 50 </ B> to solicit the <B> 50 </ B reflective mirror > always in the opposite direction of the clockwise.

Next, a control circuit for the <B> <B> 10 </ B> liquid crystal panel and the <B> 73 </ B> electric motor is explained by referring <B> to </ B> Figure <B> 5. </ B> The control circuit includes a group of sensors <B> 80. </ B> The group of sensors <B> 80 </ B> includes a speed sensor, a rotation sensor and the like to detect vehicle information such as vehicle speed and engine speed. A selector switch <B> 90 </ B> is switched to a first selected state or a second state selected to control the rotational position of the reflecting mirror <B> 50. </ B> The selector switch <B> 90 </ B> pressed to the first selected state allows the reflecting mirror <B> 50 </ B> to rotate clockwise, while the <B> 90 </ B> selector switch is operated towards the first selected state. the second selected state allows the reflecting mirror <B> 50 </ B> to turn counterclockwise.

An <B> 100 </ B> operating switch is closed to operate the <B> <B> 10 </ B> LCD panel display and is open to stop the display of the <B> 100 </ B> panel. <B> to </ B> liquid crystal panel <B> 10. <B> 110 </ B> temperature sensor is positioned <B> to <B> near the <B> <B> panel. / B> liquid crystal <B> 10, </ B> and detects the temperature <B> to </ B> near the <B> to </ B> liquid crystal <B> 10 </ B> panel as panel temperature <B> to </ B> liquid crystal <B> 10. </ B>

A microcomputer 120 executes a computer program in accordance with the flowcharts shown in Figures <B> <I> 6 </ I> </ B> and <B> 7. More particularly, the microcomputer 120 executes a selection operation of the selector switch <B> 90, </ B> a control process of rotation of the electric motor <B> 73 </ B> via a driver <B> 130 </ B> according to <B> to </ B> an output from the temperature sensor <B> 110, </ B> and a processing intended <B> to </ B operating or stopping the display of vehicle information by the <B> to </ B> liquid crystal panel <B> 10, </ B> through a driver circuit 140, based on outputs from sensor group <B> 80 </ B> and manipulation of actuator switch <B> 100. </ B> Microcomputer 120 is always operated when power is received from a battery on the vehicle B, and starts the computer program when IG ignition switch of the vehicle is turned on. The computer program is stored in advance in a read-only memory of the microcomputer 120.

Driver <B> 130 </ B> drives the <B> 73 </ B> electric motor to turn the mirror <B> 50 </ B> clockwise or into the the reverse direction under the control of the microcomputer 120. The driver 140 drives the <B> liquid crystal panel <B> 10 </ B> for display under the control of the microcomputer 120.

In the present embodiment as above, it is assumed that the vehicle is put into a circulating state by closing the ignition switch IG. The microcomputer 120 begins to run the computer program in accordance with the flowcharts shown in FIGS. 6 and 7 as soon as the ignition switch IG is closed. .

First, <B> at step 200, the rotational position of the reflecting mirror <B> 50 </ B> is set <B> at </ B> its initial position. Specifically, the reflecting mirror <B> 50 </ B> is aligned <B> at </ B> the position that has been stored <B> at </ B> step <B> 231 </ B> before the ignition switch IG is open. According to this treatment, the driving circuit <B> 130 </ B> attacks the electric motor <B> 73 </ B> to rotate the reflecting mirror <B> 50 </ B > to the initial position. After that, at step 201, the detection temperature T detected by the temperature sensor <B> 110 </ B> is inputted to the microcomputer 120. Then, <B> to < In step 202, the actual temperature gradient AT / Δt of the detection temperature T is calculated. Then, at step 210, it is determined whether the temperature gradient AT / Δt is a predetermined temperature rise gradient AT ,, / Δt or not.

In the present embodiment, the predetermined temperature rise gradient ATJAt is introduced based on the following principles. In particular, it was examined how the thermal rays of sunlight caused a change in temperature of the panel <B> to <B> 10 </ B> when sunlight was inversely incident on the <B> to </ B> liquid crystal <B> 10 </ B> panel through the windshield 20 and the reflecting mirror <B> 50, </ B> as shown in Figure <B> 9, </ B> and the data shown in Figure <B> 8 </ B> were obtained.

According to <B> at </ B> figure <B> 8, </ B> the temperature of the <B> to </ B> liquid crystal panel is increased by approximately <B> 350 C </ B> after the flow of approximately <B> 15 </ B> s from the moment when sunlight begins <B> to </ B> be inversely incident on the <B> to </ B> liquid crystal <B > 10, </ B> which was held <B> at </ b> 35c> <B> C, </ B> through the windshield 20 as described above. The rise in temperature can thermally damage the panel <B> to </ B> liquid crystal <B> 10. </ B> As a result, a temperature rise gradient when t <B≥ 0 </ B> on the Figure <B> 8 </ B> is introduced as the predetermined temperature rise gradient above ATO / At. The time of approximately <B> 15 </ B> s corresponds to <B> at </ B> a time interval where sunlight is permanently incident on the <B> to </ B> liquid crystal panel <B> 10 </ B> through the windshield 20 in a day.

If the temperature gradient AT / At corresponds to the predetermined temperature rise gradient ATO / At, the temperature gradient is considered to be assigned <B> to sunlight inversely incident on the panel <B> at </ b>. <B> 10 </ B> through the windshield 20 and the reflecting mirror <B> 50. </ B> As a result, the determination <B> to </ B> step 210 is YES, and at step 211, the rotational position of the reflecting mirror <B> 50 </ B> is controlled to prevent sunlight from being incident on the <B> to </ B> liquid crystal panel <B> 10 </ B> after being reflected by the reflecting mirror <B> 50. </ B>

More particularly, the rotational position of the reflecting mirror <B> 50 </ B> is controlled to be as shown in FIG. 4. The position shown in FIG. 4 is hereinafter referred to as the incidence preventing position. inverse of sunlight (sunlight prevention position, first position) <B>. </ B> As shown in figure <B> 10, </ B> the reflecting mirror <B> 50 < Positioned as shown in Figure 4 can reflect sunlight, which is incident on the reflecting mirror <B> 50 </ B> after passing through the windshield, towards the underside of the panel <B> to </ B> liquid crystal <B> 10. </ B>

More particularly, the driving circuit <B> 130 </ B> drives the electric motor <B> 73 <B> to </ B>, which the reflecting mirror <B> 50 </ B > is set to <B> at the inverse sunlight prevention position described above. That is, gear <B> to </ B> gear 74 is rotated counterclockwise by the electric motor <B> 73. </ B> Gearbox <B> to </ B> pinion 74 accordingly rotates the gear <B> to </ B> sector <B> 75 </ B> as well as the intermediate gear <B> 76 </ b> clockwise and the intermediate gear <B> 76 </ B> rotates the <B> gear <B> 77 </ B> counter-clockwise of a watch at the same time as the reflecting mirror <B> 50. </ B> As a result, the rotational position of the reflecting mirror <B> 50 </ B> is established <B> at </ B> Inhibition position of reverse incidence of sunlight.

Accordingly, even if the sunlight is incident on the reflective surface <B> 51 </ B> of the reflecting mirror <B> 50 </ B> after passing through the windshield 20, the incident sunlight is reflected. by the reflective surface <B> 51 </ B> to the underside of the <B> to </ B> liquid crystal <B> 10 </ B> panel as shown in Figure <B> 10, </ B> that is, a peripheral part of the <B> to </ B> liquid crystal panel <B> 10. </ B> Sunlight is safely prevented from being inversely incident on the <B> panel <B> 10 </ B> Liquid Crystal <B> 10 </ B>. The <B> to <B> 10 </ B> liquid crystal panel is not damaged by the thermal rays of the <B> 10 </ B> light. Sun.

After that, <B> at </ B> step 220, it is determined whether or not <b> 15 </ b> min elapsed after the determination of step 210 such that the YES response was made. The reverse incidence of sunlight described above disappears when <B> 15 </ B> min has elapsed. As a result, the determination <B> at </ B> step 220 is a YES response when about <B> 15 </ B> min has elapsed. Then, at next step 221, the rotational position of the reflecting mirror <B> 50 </ B> is reduced to the position of step 200. that is, driver <B> 130 </ B> controls the electric motor <B> 73 </ B> to drive the rotation adjustment device <B> 70, </ b> and the rotation adjustment device <B> 70 </ B> returns the reflecting mirror <B> 50 to the rotational position of step 200. Thus, because the rotational position of the reflecting mirror <B> 50 </ B> is brought back to its original position after the reverse incidence of sunlight on reflecting mirror <B> 50 </ B> disappears, head-up visualization can be established in a normal usable state.

After the processing of step 221 is executed or after a determination of a <B> NO </ B> response is made <B> at step 210, it is determined whether the switch Ignition IG is open or not <B> to </ B> step <B> 230. </ B> In the present stage, because the ignition switch IG is closed, the determination <B> to <B> step <B> 230 </ B> is a <B> NO </ B> response. Then, <B> at step 240, it is determined whether the display by the <B> to </ B> liquid crystal <B> 10 </ B> panel is needed or not. When the <B> 100 </ B> actuator switch is closed to operate the <B> LCD <B> 10 <B> panel display, the <B> determination to </ B> Step 240 is a YES answer. In this case, at step 241, the <B> to liquid crystal <B> 10 </ B> panel is commanded to display the vehicle information. That is, the <B> to </ B> liquid crystal <B> 10 </ B> panel is driven together with the light source 40 by the driver 140, and the information of the display are directed to the reflecting surface <B> 51 </ B> of the reflecting mirror <B> 50 </ B> using light as a support. The light comprising the display information is reflected by the reflective surface <B> 51, </ B> and is incident on the inner surface of the windshield 20 after passing through the sealed cover <B> to </ B> > The dust <B> 60. </ B> Then the incident light is reflected by the windshield 20, and enters the eyes of the driver M. As a result, the driver M visually observes the information of the display in the form of the image 21. In this case, as the reflecting mirror <B> 50 </ B> is a concave mirror, the image 52 formed by the reflecting mirror <B> 50 </ B> is enlarged and projected further. As a result, the image 21 formed by the windshield 20 is also enlarged and projected further forward. As a result, the driver M can visually observe the image 21 more easily.

As also described above, as., Sunlight is prevented from being inversely incident on the <B> to </ B> liquid crystal panel <B> 10 </ B> by controlling the position in rotation of the reflecting mirror <B> 50, </ B> an expensive optical filter does not need to be provided between the <B> <B> 10 </ B> liquid crystal panel and the Reflective mirror <B> 50 </ B> to intercept light with a specific wavelength. This results in a reduction of costs. In addition, the intensity of the light emitted by the liquid crystal panel, that is the brightness of the display on the windshield 20, is not reduced <B > to </ B> cause of the filter as above.

After step 241 has been executed, <B> at step 250, it is determined whether the display position of the display information on the windshield 20 must be adjusted or not. If the <B> 90 </ B> selector switch is manipulated to the first or second selected state, the determination <B> to </ B> step <B> 250 </ B> is a YES response. When the selector switch <B> 90 </ B> is switched to the first selected state, <B> to </ B> step 251, the reflecting mirror <B> 50 </ B> is rotated on an angle predetermined in the direction of clockwise. If the selector switch <B> 90 </ B> is switched to the second selected state, <B> to </ B> step 251, the reflecting mirror <B> 50 </ B> is rotated according to the predetermined angle in the counterclockwise direction. That is, the rotational position adjusting device <B> 70 </ B> controls the reflecting mirror <B> 50 </ B> in order to rotate it in a clockwise direction. shows or in the opposite direction <B> to </ B> the predetermined angle. Accordingly, the display position of the image on the windshield 20 can be appropriately adjusted according to the position of the driver's seat, to the conformation driver seated in the driver's seat, and other.

On the other hand, if the vehicle is stopped and the ignition switch IG is open, the determination <B> at </ B> step <B> 230 </ B> is a YES response. In this case, <B> at </ B> step 231, the microcomputer 120 sets <B> to </ B> day the last rotational position of the reflecting mirror <B> 50 < / B> while '' receiving electricity from the battery B, directly. Then, at <B> step <B> 232, </ B> the rotating position of the reflecting mirror <B> 50 </ B> is set to be a reverse incidence prevention position. of the sunlight described above. That is, the reflecting mirror <B> 50 </ B> is driven by the rotating position adjusting device <B> 70 </ B> to rotate to the position of prevention of rotation. inverse incidence of sunlight.

As a result, if the vehicle is parked and allows sunlight to be incident on the windshield 20 for a long time, the reflecting surface <B> 51 </ B> of the reflecting mirror <B> 50 </ B> may reflect sunlight to the underside of the <B> to </ B> liquid crystal panel <B> 10 </ B> as described above to prevent sunlight from being directed to the panel <B> to </ B> liquid crystal <B> 10. </ B> As a result, the same effects as those obtained <B> at </ B> step 211 can be obtained.

<B> A </ B> in this regard, although the reflecting mirror is set <B> to </ B> the position of preventing reverse incidence of sunlight by rotating it in the opposite direction of the needles of a watch in the present embodiment, the position of the reflecting mirror <B> 50 </ B> shown in Figure <B> 3 </ B> can be set <B> to </ B> the position of inverse incidence of sunlight (second position). In this case, the reflecting surface <B> Si </ B> of the reflecting mirror <B> 50 </ B> does not receive sunlight passing through the windshield 20. As a result, the sunlight is prevented from being inversely incident on the <B> to <B> 10 </ B> liquid crystal panel and the same effects as those described above can be obtained. The figure <B> il </ B> represents a modified example of the present embodiment. In this modified example, two concave mirrors 50a, <B> 50b </ B> and a plane mirror 50c are adopted <B> to </ B> instead of the reflecting mirror <B> 50. </ B> Concave mirrors 50a, <B> 50b </ B> are provided directly below the <B> <B> 60 </ B> waterproof cover with respective reflective surfaces opposite one <B> to </ B> the other. <B> A </ B> instead of the reflecting mirror <B> 50, </ B> the plane mirror 50c is supported in an integrated way and with possibility of rotation by the rotation shaft <B> 72 </ B> the body of the device <B> 71 </ B> in a similar way to the reflective mirror <B> 50. </ B>

When the plane mirror Soc is controlled by the rotational position adjusting device <B> 70 </ B> so that the reflecting surface thereof is facing <B> at </ B> the time <B> to </ B> the reflective surface of the concave mirror <B> 50b </ B> and <B> to </ B> the display area <B> it </ B> from the panel <B> to </ B> liquid crystal <B> 10, </ B> the light intended to <B> to </ B> display vehicle information, issued from the <B> panel to </ B> liquid crystal <B> 10, </ B > is reflected by the reflecting surfaces of the plane mirror 50c and the concave mirrors 50a, <B> 50b </ B> in succession, and is incident on the inner surface of the windshield 20 after having passed through the sealed cover <B Dust <B> 60. </ B> Accordingly, the display information is displayed as an image as described above. The other features are the same as those of the embodiment above.

In this modified example shown in the figure <B> it, </ B> even if there is a situation where sunlight can enter the <B> to </ B> liquid crystal panel <B> 10 < After being reflected by the concave mirrors 50a, 50b, and the plane mirror Soc, as particularly described above, the rotational position adjusting device <B> 70 </ B> can adjust the rotational position of the plane mirror 50c to the inverse incidence hindrance position of sunlight if the determination <B> to </ B> step 210 or <B > at </ B> step <B> 230 </ B> is a YES answer. Accordingly, the same effects as those achieved by processing executed at step 211 or <B> 232 of the above embodiment can be obtained in this modified example.

In the above embodiment and the modified example, the present invention is applied to the head-up display for a vehicle. However, the present invention is not limited to this, but can be applied in a general manner to various head-to-top visualizations. The vehicle adopting the head-up display in accordance with the present invention can be an electric motor vehicle. In this case, the determination <B> to </ B> step <B> 230 </ B> is performed by <B> handling a switch <B> to </ B> key (corresponding to ignition IG switch) intended to start the vehicle to electric motor, and the following steps are performed in a similar manner.

An electroluminescent panel <B> (EL), </ B> a light emitting diode, a tube <B> to </ B> discharge <B> to cold cathode, or others, may be adopted <B> to </ B> the <B> <B> 10 </ B> liquid crystal panel and light source 40. A photodetector or <B> light modulation switch can be adopted to modulate the light in the <B> to </ B> liquid crystal <B> 10 </ B> panel for the image displayed on the windshield 20 in accordance with the <B> at </ B> brightness room.

Although the present invention has been set forth and described with reference to the foregoing preferred embodiments, it will be apparent to those skilled in the art that variations of form and detail can be made to <B> to </ B> this without departing from the scope of the invention as defined in the appended claims.

Claims (1)

  1. CLAIMS <B> 1. </ B> Head-up display intended for <B> to </ B> a vehicle, comprising <B>: </ B> a display device <B> (10) </ B> having a display surface <B> (11) </ B> for <B> to emit light with display information, and a reflecting mirror <B> (50) </ B> rotatably disposed on the front of the display surface <B> (11) </ B> and having a reflective surface <B> (51) </ B> for receiving <B> the light from the display device <B> (10) </ B> and <B> to </ B> reflect the light to a windshield (20) when the reflecting mirror <B> (50) </ B> is positioned <B> at </ B> a functional position, in which <B>: </ B> the reflecting mirror <B> (50) </ B> is rotated into a specific condition to be established <B to one of a first position and a second position, different from the functional position, the reflecting mirror <B> (50) </ B> set <B> to </ B> at first position has a reflective surface <B> (51) </ B> which reflects sunlight, which is incident on the reflecting mirror <B> (50) </ B> after passing through the windshield (20). ) to a peripheral part of the <B> (10) </ B> display device to prevent sunlight from entering the <B> (11) </ B> display surface of the display device. display <B> (10), </ B> and the reflecting mirror <B> (50) </ B> set <B> to </ B> the second position has a reflective surface <B> (51) < / B> which does not receive sunlight from the windshield (20). Head-high visualization according to claim 1, wherein the display device <B> (10) </ B> is disposed at a side of the rear surface of a dashboard <B> (30) </ B> which is disposed at a lower side of the windshield (20) in a passenger compartment of the vehicle, and the reflected light by the reflecting mirror <B> (50) </ B> passes through an opening '<B> (32) </ B> defined in the <B> (30) </ B> dashboard and is incident on an inner surface of the windshield (20). <B> 3. Head-high visualization according to any one of claims 1 and 2, further comprising a rotational position adjusting device <B> (70, < / B> 200) for rotating <B> mirror (50) </ B> under the specific condition to prevent sunlight from entering the display device B> (10). 4. A head-up display according to any one of claims 1 to 3, wherein the reflecting mirror <B> (50) </ B> is set to one of the first position and the second position when a <B> to </ B> key (IG) switch to <B> start the vehicle is opened. <B> 5. </ B> Head-up display according to any one of claims 1 to 4, further comprising display device control means <B> (100, < / B> 240) for controlling the display device <B> (10) </ B> to be in one of a functional state in which the device display <B> (10) </ B> emits light and in a non-functional state in which the display device <B> (10) </ B> stops emitting light, in which <B> : </ B> Reflective Mirror <B> (50) </ B> reflects light from the display device <B> (10) </ B> to the windshield (20) when the display <B> (10) </ B> is set in the functional state, and the reflecting mirror <B> (50) </ B> is set <B> to </ B> one of the first position and the second position when the display device <B> (10) </ B> is set to the non-functional state. <B> 6. </ B> The head-up view of claim 5, further comprising a selector switch <B> (90) </ B> which is manipulated when the reflecting mirror < B> (50) </ B> is rotated, wherein <B>: </ B> when the display device control means <B> (100, </ B> 240) sets the display device <B> (10) </ B> in the functional state, the reflecting mirror <B> (50) </ B> is rotated from the manipulation of the selector switch so that the reflecting mirror <B> (50) </ B> reflects light from the display device <B> (10) </ B> to the windshield (20), and when the display device control means <B> ( 100, <240>) sets the display device <B> (10) </ B> in the non-functional state, the reflecting mirror <B> (50) </ B> is rotated to be established < B> to </ B> one of the first position and the second position. <B> 7. </ B> A head-up view according to any one of claims 1 to 6, further comprising <B>: </ B> a temperature detector <B> ( 110) for detecting a temperature of the display device <B> (10), </ B> and a temperature rise gradient determining means (210) for <B> to </ B> B> to </ B> determine if a temperature rise gradient of the display device <B> (10) </ B> is <B> to </ B> a specific value, in which the reflecting mirror <B > (50) </ B> is set <B> to </ B> one of the first position and the second position when the rise temperature gradient determining means (210) determines that the rising gradient in temperature of the display device <B> (10) </ B> is <B> to </ B> the specific value. <B> 8. </ B> Head-up display according to claim 7, wherein the specific value is a temperature rise gradient specific to the display device <B> (10) < / B> which is caused by the sunlight incident on the display device <B> (10) </ B> after passing through the windshield (20). <B> 9. </ B> Head-high visualization according to any one of claims <B> 7 </ B> and <B> 8, </ B> further comprising a control unit (120) for < B> to </ B> calculate the temperature rise gradient based on the temperature of the display device <B> (10) </ B> detected by the temperature detector <B> (110). </ B> <B> 10. </ B> Head-up display according to any one of claims 7 to 9, in which the reflecting mirror <B> (50) </ B> is brought back <B> to </ B> the functional position after a specific time interval has elapsed since the reflecting mirror <B> (50) </ B> is set <B> to </ B> > one of the first position and the second position in accordance with the determination of the rise temperature gradient determining means (210). <B> il. </ B> Head-up display according to any one of claims 1 to 10, wherein the reflecting mirror <B> (50) </ B> is set <B > at </ B> the functional position when the <B> to </ B> key (IG) switch is closed. A head-up display according to any one of claims 1 to 11, wherein the display device <B> (10) </ B> is composed of a panel <B> to <B> (10) </ B> liquid crystals and rear lighting (40), the reflecting mirror <B> (50) </ B> is a concave mirror, and the reflecting mirror < B> (50) </ B> is rotated to be set <B> to </ B> one of the first position and the second position when a key switch <B> to </ B> (IG) intended to <B> to </ B> start the vehicle is closed. <B> 13. </ B> Head-up display, comprising a display device <B> (10) </ B> for sending a first light having display information, and a rotatable mirror <B> (50) </ B> rotatably disposed to face the display device <B> (10) </ B> to receive the first light from the display device < B> (10) </ B> and <B> to </ B> reflect the first light to a transparent element (20), in which the reflecting mirror <B> (50) </ B> is rotated to prevent a second light, which is incident on the reflecting mirror <B> (50) </ B> after passing through the transparent element (20), to enter the display device <B> (10). </ B> 14. A control method for preventing sunlight from entering a display device <B> (10) </ B> of a head-up display installed in a vehicle and comprising a reflecting mirror < B> (50) <B> to <B> reflect the light emitted from the display device <B> (10) </ B> to a windshield (20) of the vehicle, the method comprising <B>: </ B> detecting one of the situations where a vehicle ignition switch (IG) is open, a display device <B> (10) </ B> is prevented from emitting light, and a temperature rise gradient of the display device <B> (10) </ B> has a specific value, and the rotation of a reflecting mirror <B> (50 </ B> to a sunlight prevention position <B> to </ B> where the reflecting mirror <B> (50) </ B> reflects sunlight incident on it after passed through a windshield (20) to a peripheral portion of the display device <B> (10) </ B> to prevent sunlight from entering the display device <B> (10), </ B> when one of the situations is detected. <B> 15. </ B> The control method according to claim 14, further comprising <B>: </ B> rotating the reflecting mirror <B> (50) </ B> to a functional position < B> to </ B> where the reflecting mirror <B> (50) </ B> reflects the light emitted from the display device <B> (10) </ B> to the windshield (20), when the ignition switch (IG) is closed after the ignition switch (IG) is open. <B> 16. </ B> The control method according to claim 14, further comprising <B>: </ B> rotating the reflecting mirror <B> (50) </ B> to a functional position < B> to </ B> where the reflecting mirror <B> (50) </ B> reflects the light emitted from the display device <B> (10) </ B> to the windshield (20), when the display device <B> (10) </ B> begins <B> to </ B> emit light after the light emission of the display device <B> (10) </ B > is stopped. <B> 17. </ B> The control method according to claim 14, further comprising <B>: </ B> rotating the reflecting mirror <B> (50) </ B> to a functional position < B> to </ B> where the reflecting mirror <B> (50) </ B> reflects the light emitted from the display device <B> (10) </ B> to the windshield (20), when a specific time interval has elapsed since the temperature rise gradient of the display device <B> (10) </ B> is defined as having the specific value.
FR0011606A 1999-09-28 2000-09-12 Car head up display (HUD) having internal display screen illuminating windscreen with two position rotating mirrors having first position sunlight illuminating display and second optical source illumination Withdrawn FR2799008A1 (en)

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JP27472799A JP2001097073A (en) 1999-09-28 1999-09-28 Head-up display for vehicle

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