WO2013094012A1

WO2013094012A1 - Headup display, display apparatus, and control method

Info

Publication number: WO2013094012A1
Application number: PCT/JP2011/079507
Authority: WO
Inventors: 悠希沓澤
Original assignee: パイオニア株式会社
Priority date: 2011-12-20
Filing date: 2011-12-20
Publication date: 2013-06-27

Abstract

This headup display has a light source, an illuminance detection means, a first adjustment means, a second adjustment means, a setting means and a control means. The first adjustment means automatically adjusts, corresponding to illuminance detected by means of the illuminance detection means, a quantity of light to be outputted from the light source. The second adjustment means adjusts, on the basis of operations performed by a user, the quantity of the light to be outputted from the light source. The setting means performs switching between a first state, in which the adjustment is performed by means of the first adjustment means, and a second state, in which the adjustment is not performed. In the cases of being in the second state, when the light source is brought into the turned-on state from the turned-off state, the control means turns on the light source with the light quantity that corresponds to the detected illuminance, then, permits the second adjustment means to perform the adjustment.

Description

Head-up display, display device, and control method

The present invention relates to a technique for displaying information.

Conventionally, there is a head-up display that allows a display image of information related to driving of a vehicle to be visually recognized as a virtual image from the position (eye point) of the driver. For example, Patent Literature 1 discloses a display brightness adjustment control device for a head-up display having an automatic brightness adjustment function that automatically adjusts an output so as to obtain a display brightness preferable for a driver according to the illuminance of outside light.

JP-A-11-67464

In a head-up display having an automatic brightness adjustment function, if the automatic brightness adjustment function is enabled, the display brightness can be automatically adjusted according to the ambient illuminance. On the other hand, when the user disables the automatic brightness adjustment function for reasons such as avoiding the trouble of switching the display brightness during driving, the display brightness when the light source is turned on is the display brightness immediately before the light source is turned off. Set to Therefore, in this case, due to the difference in ambient illuminance between the previous lighting and the current lighting, the display brightness when lighting is excessively high relative to the surrounding illuminance, the driver's eyes are dazzled, or the display brightness when lighting is around The display of the head-up display may be difficult to see due to excessively low illuminance.

The present invention has been made to solve the above-described problems, and has as its main object to provide a head-up display and a display device capable of appropriately adjusting the luminance when the light source is turned on. To do.

Invention of Claim 1 is a head-up display, Comprising: The light source which irradiates the light for displaying an image to a display means, The illumination intensity detection means which detects illumination intensity, The illumination intensity detected by the said illumination intensity detection means The first adjustment means for automatically adjusting the amount of light emitted from the light source according to the second adjustment means, the second adjustment means for the user to arbitrarily adjust the amount of light emitted from the light source, and the adjustment by the first adjustment means A setting means that switches between a first state that is performed and a second state that is not performed, and when in the second state, when the light source is turned off, And a control unit that enables adjustment by the second adjustment unit after the light source is turned on with the light amount corresponding to the illuminance.

The invention according to claim 7 is a head-up display, wherein the emitted light quantity of the light source for irradiating the display means with light for displaying an image is automatically set to the light quantity according to the illuminance detected by the illuminance detection means. A setting means that can be set to a first adjustment mode that is automatically adjusted and a second adjustment mode that is arbitrarily adjusted by a user, and the light source is turned off when the second adjustment mode is set And a control means for setting the second adjustment mode after the emitted light amount is turned on with the light amount corresponding to the illuminance.

The invention according to claim 8 is a control method executed by a head-up display having a light source that irradiates display means with light for displaying an image, the illuminance detecting step for detecting illuminance, and the illuminance detecting step A first adjustment step of automatically adjusting the amount of light emitted from the light source in accordance with the illuminance detected by the second, a second adjustment step for the user to arbitrarily adjust the amount of light emitted from the light source, and the first A setting step for switching between a first state in which adjustment by the adjustment step is performed and a second state in which the adjustment is not performed, and a lighting state from a state in which the light source is turned off in the second state A control step that enables adjustment by the second adjustment step after the light source is turned on with the amount of light corresponding to the illuminance.

The invention according to claim 9 is a display device, wherein a light source for irradiating the display means with light for displaying an image, an illuminance detection means for detecting illuminance, and an illuminance detected by the illuminance detection means. In response, first adjustment means for automatically adjusting the amount of light emitted from the light source, second adjustment means for the user to arbitrarily adjust the amount of light emitted from the light source, and adjustment by the first adjustment means are performed. The setting means for switching and setting the first state to be performed and the second state that is not performed, and when in the second state, when the light source is turned off, And a control unit that enables adjustment by the second adjustment unit after the light source is turned on with the light amount corresponding to the illuminance.

It is a schematic block diagram of the head-up display which concerns on a present Example. It is a flowchart which shows the process sequence which a control part performs. It is a flowchart which shows the procedure of a brightness | luminance automatic adjustment process. The schematic structure of the head-up display which concerns on a modification is shown.

In one preferred embodiment of the present invention, the head-up display includes a light source that irradiates display means with light for displaying an image, an illuminance detection means that detects illuminance, and an illuminance detected by the illuminance detection means. The first adjustment means for automatically adjusting the amount of light emitted from the light source according to the second adjustment means, the second adjustment means for the user to arbitrarily adjust the amount of light emitted from the light source, and the adjustment by the first adjustment means A setting means that switches between a first state that is performed and a second state that is not performed, and when in the second state, when the light source is turned off, And a control unit that enables adjustment by the second adjustment unit after the light source is turned on with the light amount corresponding to the illuminance.

The head-up display has a light source, illuminance detection means, first adjustment means, second adjustment means, setting means, and control means. The first adjusting means automatically adjusts the amount of light emitted from the light source according to the illuminance detected by the illuminance detecting means. The second adjusting means adjusts the amount of light emitted from the light source based on a user operation. The setting means switches between a first state in which the adjustment by the first adjustment means is performed and a second state in which the adjustment is not performed. When the control unit is in the second state, when the light source is turned off, the control unit turns on the light source with a light amount corresponding to the detected illuminance and then adjusts by the second adjustment unit. Is possible.

Generally, in a bright environment in the daytime, the user is bright in the surroundings due to outside light, so that the display of the head-up display is difficult to see and the display brightness is set high. On the other hand, in a dark environment after sunset, the user sets the display brightness low because the display on the head-up display is emphasized by the surrounding darkness and is relatively easy to see. Therefore, when the light source is turned on in the second state, the driver's eyes are dazzled or the display on the head-up display is difficult to see due to the difference in ambient illuminance between the previous lighting and the current lighting. there's a possibility that. Considering the above, the head-up display turns on the light source with a light amount corresponding to the detected illuminance when the light source is turned on in the second state. This prevents the user from changing the setting from the second state to the first state against the intention of the user, while the driver's eyes are dazzling or the display of the head-up display is difficult to see when the light source is turned on. It can suppress suitably.

In one aspect of the head-up display, when the control unit is in the second state, the light amount calculated according to the illuminance when the light source is turned off when the light source is turned off, When the light amount is higher than the light amount set by the second adjusting means, the light source is irradiated with the light amount lower than the light amount calculated according to the illuminance. In this aspect, the head-up display reduces the adjustment amount of the display brightness when there is no possibility that the user feels the laser beam dazzling when the light source is turned on. Also according to this aspect, the head-up display can suitably suppress the user's eyes being dazzled and hindering driving.

In another aspect of the head-up display, when the control unit is in the second state, the light amount calculated according to the illuminance when the light source is turned off when the light source is turned off. However, when it becomes higher than the light quantity set by the second adjusting means, the light is emitted from the light source with the light quantity set by the second adjusting means. According to this aspect, the head-up display can adjust the display brightness only when the user feels the laser beam dazzling when the light source is turned on. Therefore, the head-up display can prevent the user's eyes from dazzling and hindering driving while minimizing the opportunity to automatically adjust the display brightness for the user who wants to disable the automatic brightness adjustment function.

In another aspect of the head-up display, the display means is a windshield or combiner that allows a user to recognize a virtual image by reflecting light emitted from the light source.

In another aspect of the head-up display, the upper limit of the light amount that can be adjusted by the second adjusting unit is changed according to the illuminance detected by the illuminance detecting unit. According to this aspect, the head-up display can preferably determine the upper limit of the amount of light that can be adjusted by the second adjusting means.

In another aspect of the head-up display, when the illuminance detected by the illuminance detection unit is high, the upper limit of the light amount that can be adjusted by the second adjustment unit is lower than when the illuminance is low. . According to this aspect, the head-up display can suppress the sum of the light amount due to the external light incident on the user's eyes and the light amount of the light emitted from the light source from becoming excessive.

In another embodiment of the present invention, the head-up display automatically changes the amount of light emitted from the light source for irradiating the display means with light for displaying an image to the amount of light according to the illuminance detected by the illuminance detection means. A setting means that can be set to a first adjustment mode to be adjusted and a second adjustment mode that is arbitrarily adjusted by the user, and when the second adjustment mode is set, the light source is turned on when the light source is turned off. When the state is set, the control unit sets the second adjustment mode after turning on the emitted light amount with the light amount corresponding to the illuminance. Also in this embodiment, when the light source is turned on in the second adjustment mode, the head-up display turns on the light source with a light amount corresponding to the detected illuminance, so that the difference in ambient illuminance from the previous lighting is changed. Due to this, it is possible to suitably suppress the driver's eyes from being dazzled or the display of the head-up display from being difficult to see. In this case, since the head-up display does not need to change the setting from the second adjustment mode to the first adjustment mode, the setting is changed from the second adjustment mode to the first adjustment mode against the intention of the user. Can be prevented.

In still another embodiment of the present invention, there is provided a control method executed by a head-up display having a light source for irradiating display means with light for displaying an image, the illuminance detecting step for detecting illuminance, and the illuminance detection A first adjustment step of automatically adjusting the amount of light emitted from the light source according to the illuminance detected in the step; a second adjustment step for the user to arbitrarily adjust the amount of light emitted from the light source; A setting step for switching between a first state in which adjustment is performed in one adjustment step and a second state in which adjustment is not performed, and a lighting state from a state in which the light source is turned off in the second state A control step that enables adjustment by the second adjustment step after the light source is turned on with the amount of light corresponding to the illuminance. By executing this control method, the head-up display prevents the driver from dimming when the light source is turned on, while preventing the setting from being changed from the second state to the first state against the user's will. It is possible to suitably suppress the display of the up-display from being difficult to see.

In still another embodiment of the present invention, a light source for irradiating the display means with light for displaying an image, an illuminance detection means for detecting illuminance, and the light source according to the illuminance detected by the illuminance detection means. A first adjustment unit that automatically adjusts the amount of light emitted; a second adjustment unit that allows the user to arbitrarily adjust the amount of light emitted from the light source; and a first state in which adjustment by the first adjustment unit is performed , A setting unit that switches and sets the second state that is not performed, and when in the second state, when the light source is turned off to turn on, according to the illuminance Control means for enabling adjustment by the second adjustment means after turning on the light source with the light amount. With this aspect, the display device prevents the driver from changing the setting from the second state to the first state against the intention of the user, and the driver's eyes are dazzled when the light source is turned on, or the display of the head-up display is visible. It can suppress suitably that it is difficult.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Configuration of head-up display]
FIG. 1 is a schematic configuration diagram of a head-up display 100 according to the present embodiment. As shown in FIG. 1, the head-up display 100 according to this embodiment includes a light source unit 1, a combiner 2, and an illuminance sensor 5. The head-up display 100 is mounted on a vehicle that includes a windshield 20, a ceiling portion 22, a hood 23, and a dashboard 24.

The light source unit 1 is installed on the ceiling portion 22 in the passenger compartment via the

support members

11a and 11b, and emits light constituting an image indicating information for assisting driving toward the combiner 2. Specifically, the light source unit 1 generates an original image (real image) of the display image in the light source unit 1 based on the control of the control unit 10, and emits light constituting the image to the combiner 2. The virtual image “Iv” is visually recognized by the driver via the combiner 2.

In addition, the light source unit 1 includes an operation unit (also referred to as “brightness adjustment unit OP1”) such as a button or a knob for manually adjusting the display brightness level of the head-up display 100, and the display brightness of the head-up display 100. Is provided with an operation unit (also referred to as “brightness automatic adjustment setting unit OP2”) for switching between enabling and disabling a function for automatically adjusting the brightness (also referred to as “brightness automatic adjustment function”). Furthermore, the light source unit 1 switches an ON / OFF of the power source of the head-up display 100 and an operation unit (also referred to as “laser light switching unit OP3”) for switching on / off of the laser light of the light source unit 1. Operating unit (also referred to as “power supply switching unit OP4”). The above-described luminance adjustment unit OP1, automatic luminance adjustment setting unit OP2, laser light switching unit OP3, and power supply switching unit OP4 are provided, for example, on the side surface or bottom surface of the light source unit 1. Note that the luminance adjustment unit OP1, the automatic luminance adjustment setting unit OP2, the laser light switching unit OP3, and the power supply switching unit OP may be provided in a remote controller (not shown) separate from the light source unit 1.

The combiner 2 projects the display image emitted from the light source unit 1 and reflects the display image to the driver's eye point “Pe” to display the display image as a virtual image Iv. And the combiner 2 has the support shaft part 7 installed in the ceiling part 22, and rotates the support shaft part 7 as a spindle. The combiner 2 is an example of the “display unit” in the present invention. The support shaft portion 7 is installed, for example, in the vicinity of the ceiling portion 22 near the upper end of the windshield 20, in other words, near the position where a sun visor (not shown) for the driver is installed. The support shaft portion 7 may be installed instead of the above-described sun visor.

The illuminance sensor 5 is installed on the side surface of the combiner 2, for example, and detects the illuminance (light quantity) around the eye point Pe. The illuminance sensor 5 is electrically connected to the control unit 10 of the light source unit 1 and transmits a detection signal corresponding to the detected illuminance (also referred to as “detected illuminance Id”) to the control unit 10 of the light source unit 1. The illuminance sensor 5 is an example of the “illuminance detection means” in the present invention. The illuminance sensor 5 is not limited to being installed in the combiner 2, and may be installed in various places such as the light source unit 1, the windshield 20, and the dashboard 24.

The control unit 10 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like (not shown) and performs general control of the head-up display 100. Specifically, the control unit 10 detects whether or not the luminance adjustment unit OP1 has been operated, and changes the display luminance of the head-up display 100 according to the amount of operation. Further, the control unit 10 switches between enabling and disabling the automatic brightness adjustment function according to the operation to the automatic brightness adjustment setting unit OP2, and when the automatic brightness adjustment function is enabled, the detection acquired from the illuminance sensor 5 Based on the illuminance Id, the display brightness of the head-up display 100 is automatically adjusted. Furthermore, as will be described later, the control unit 10 automatically adjusts the display luminance when the light source unit 1 is turned on based on operations on the laser beam switching unit OP3 and the power source switching unit OP4.

Thus, the control unit 10 is an example of the “first adjustment unit”, “second adjustment unit”, “setting unit”, and “control unit” in the present invention. The state where the automatic brightness adjustment function is valid is an example of the “first state” and “first adjustment mode” in the present invention, and the state where the automatic brightness adjustment function is invalid is the “second state” in the present invention. And “second adjustment mode”.

[Brightness adjustment method]
Next, a luminance adjustment method performed by the control unit 10 in this embodiment will be described. Even when the automatic brightness adjustment function is invalid, the control unit 10 responds to the detected illuminance Id without changing the setting of the automatic brightness adjustment function when the light source unit 1 is turned off. The light source unit 1 is turned on with the amount of light. Thereby, the head-up display 100 suppresses a driver's eyes being dazzled when the light source unit 1 is turned on.

Supplementary explanation of the effect of the brightness adjustment method described above. In general, in a bright daytime environment, the user is bright in the surroundings due to outside light, so the display on the head-up display 100 is difficult to see and the display brightness is set high. On the other hand, in a dark environment after sunset, the user sets the display brightness low because the display of the head-up display 100 is emphasized by the surrounding darkness and is relatively easy to see. Therefore, when the head-up display 100 is operated when the daylight is bright with the automatic brightness adjustment function disabled, the user usually sets the display brightness high. On the other hand, when the light source unit 1 is turned on at night with the display brightness set during the day, the display brightness is set higher than necessary, and the user's eyes may be dazzled, which may hinder driving. Similarly, even when the light source unit 1 is turned on during the day with the display brightness set at night, the display brightness is set too low with respect to the surrounding illuminance, so the user can It is necessary to reset the display brightness of the display 100.

In order to deal with this problem, a method of automatically enabling the brightness automatic adjustment function when the light source unit 1 is turned on can be considered instead of the brightness adjustment method according to the present embodiment. However, in this case, the user who wants to disable the automatic brightness adjustment function in order to avoid the trouble of switching the display brightness during traveling operates the automatic brightness adjustment setting unit OP2 every time the laser beam of the light source unit 1 is turned on. Therefore, it is necessary to disable the automatic brightness adjustment function, which is troublesome.

In consideration of the above, in the present embodiment, when the automatic brightness adjustment function is disabled, the control unit 10 automatically adjusts the display brightness when the light source unit 1 is turned on without changing the setting. The display brightness is adjusted according to the ambient brightness. Thereby, it is possible to prevent the laser light from being output with such brightness that the user's eyes are dazzled when the light source unit 1 is turned on while maintaining the setting of the automatic brightness adjustment function.

[Processing flow]
Next, the brightness adjustment method of the present embodiment will be specifically described with reference to the flowcharts of FIGS.

(1) Power ON Processing FIG. 2 is an example of a flowchart illustrating a processing procedure of a brightness adjustment method executed by the control unit 10 when the power of the head-up display 100 is turned ON by the power switching unit OP4. The control unit 10 repeatedly executes the process of the flowchart illustrated in FIG. 2 according to a predetermined cycle, for example.

First, when the power of the head-up display 100 is set to ON by the power switching unit OP4, the head-up display 100 is activated (step S101). Next, the control unit 10 determines whether or not the laser beam setting is ON (step S102). In other words, the control unit 10 determines whether or not the light source unit 1 is set in a lighting state by the laser light switching unit OP3. If the setting of the laser beam is not ON (step S102; No), the control unit 10 continues to monitor the presence / absence of input by the laser beam switching unit OP3 to determine whether the setting of the laser beam is ON. To do. In addition, the control part 10 complete | finishes the process of a flowchart, when the power supply switching part OP4 sets the power supply of the head-up display 100 to OFF (step S111; Yes).

On the other hand, when the setting of the laser beam is ON (step S102; Yes), the control unit 10 performs an automatic brightness adjustment process which will be described later using the flowchart of FIG. 3 (step S103). As described above, the control unit 10 determines whether the luminance automatic adjustment function is valid or invalid at the timing when the light source unit 1 is turned on by an operation on the laser beam switching unit OP3 or the power source switching unit OP4. Perform automatic adjustment processing. Thereby, the control part 10 can prevent that a laser beam is output with the brightness which a user's eyes are dazzling at the time of lighting of the light source unit 1, keeping the setting of a brightness | luminance automatic adjustment function.

Next, the control unit 10 turns on the laser beam (step S104). At this time, the display brightness is appropriately set according to the ambient illuminance. Therefore, in this case, the laser beam is not output with such brightness that the user's eyes are dazzled, or the laser beam is not output with an excessively low display luminance with respect to the surrounding illuminance.

Next, the control unit 10 determines whether or not the automatic brightness adjustment function is effective (step S105). If the automatic brightness adjustment function is valid, the control unit 10 executes an automatic brightness adjustment process shown in the flowchart of FIG. 3 (step S106). When the automatic brightness adjustment function is enabled, the automatic brightness adjustment process in step S106 is repeatedly executed every predetermined time width.

On the other hand, when the automatic brightness adjustment function is invalid (step S105; No), the control unit 10 determines whether an operation to the brightness adjustment unit OP1 is detected (step S107). And the control part 10 changes display brightness according to the detected operation amount, when operation to the brightness | luminance adjustment part OP1 is detected (step S107; Yes) (step S108). In other words, in this case, the control unit 10 increases or decreases the amount of laser light emitted from the light source unit 1 based on the detected operation amount. On the other hand, when the operation to the brightness adjustment unit OP1 is not detected (step S107; No), the control unit 10 advances the process to step S109. As described above, when the brightness automatic adjustment function is disabled, the control unit 10 appropriately changes the display brightness based on the manual operation.

Next, in step S109, the control unit 10 determines whether or not the power of the head-up display 100 is set to OFF (step S109). And the control part 10 complete | finishes the process of a flowchart, when the power supply of the head-up display 100 is set to OFF (step S109; Yes). On the other hand, when the power supply of the head-up display 100 is set to ON (step S109; No), the control part 10 determines whether the laser beam was set to OFF (step S110). If the laser beam is set to OFF (step S110; Yes), the control unit 10 returns the process to step S102, and determines whether the laser beam setting is turned on or not. Until it becomes (steps S102, S111). On the other hand, when the laser beam is not set to OFF (step S110; No), the control unit 10 returns the process to step S105.

(2) Brightness Automatic Adjustment Process FIG. 3 is an example of a flowchart showing the procedure of the brightness automatic adjustment process according to the present embodiment. The control part 10 performs the process of the flowchart shown in FIG. 3 by step S103 or step S106 of FIG.

First, the control unit 10 acquires the detected illuminance Id (step S201). Specifically, the control unit 10 acquires the detected illuminance Id by receiving the detection signal transmitted from the illuminance sensor 5. Next, the control unit 10 calculates display brightness suitable for the detected illuminance Id (step S202). For example, the control unit 10 stores a map or expression between the detected illuminance Id and the amount of light obtained through experiments or the like in advance in a memory, and refers to the map or the like to determine the display luminance to be set from the detected illuminance Id. calculate.

Next, the control unit 10 adjusts the amount of laser light emitted from the light source unit 1 so as to obtain the calculated display brightness (step S203). By doing in this way, the control part 10 automatically adjusts display brightness appropriately according to ambient illuminance.

[Modification]
Hereinafter, modified examples suitable for the above-described embodiments will be described. The following modifications may be applied in any combination to the above-described embodiments.

(Modification 1)
In FIG. 1, the head-up display 100 allows the driver to visually recognize the virtual image Iv via the combiner 2, but the configuration of the head-up display to which the present invention is applicable is not limited to this.

FIG. 4 shows a schematic configuration of a head-up display 100A according to a modification. As shown in FIG. 4, in the head-up display 100 </ b> A, the light source unit 1 emits light constituting the display image toward the windshield 20. The windshield 20 projects a display image emitted from the light source unit 1 and reflects the display image to the eye point Pe to display the display image as a virtual image Iv. In this case, the windshield 20 is an example of the “display unit” in the present invention. In FIG. 4, the illuminance sensor 5 is attached to the bottom surface of the light source unit 1.

Further, the position of the light source unit 1 is not limited to being installed on the ceiling portion 22 and may be installed inside the dashboard 24. In this case, the dashboard 24 is provided with an opening for allowing light to pass through the combiner 2 in FIG. 1 or the windshield 20 in FIG. 4.

(Modification 2)
The control unit 10 may automatically adjust the display brightness when the laser light is turned on only when the user feels the laser light dazzling when the light source unit 1 is turned on. Specifically, when performing the brightness automatic adjustment process in step S103 of FIG. 2, the control unit 10 displays the display brightness calculated in step S202 of FIG. 3 and the currently set display brightness before executing step S203. Compare to. Then, when the display brightness calculated in step S202 is equal to or higher than the currently set display brightness, the control unit 10 determines that there is no possibility that the user feels the laser beam dazzling without automatically adjusting the display brightness. However, step S203 is not executed. That is, in this case, the control unit 10 adjusts the light amount of the laser emitted from the light source unit 1 so that the display luminance set manually by the luminance adjustment unit OP1.

On the other hand, if the display brightness calculated in step S202 is less than the currently set display brightness, the control unit 10 determines that the user may feel dazzling laser light unless the display brightness is automatically adjusted. Then, step S203 is executed. Thus, according to this modification, the control unit 10 can adjust the display brightness only when the user feels the laser beam dazzling when the laser beam is turned on. Therefore, the control unit 10 can prevent the user's eyes from dazzling and hindering driving while minimizing the opportunity to automatically adjust the display luminance for the user who wants to disable the automatic luminance adjustment function.

(Modification 3)
The control unit 10 may change the display luminance range that can be adjusted by the luminance adjustment unit OP1 according to the detected illuminance Id. Specifically, the control unit 10 integrates the light amount “T1” in which the light emitted from the light source unit 1 is incident on the user's eye and the light amount “T2” in which the external light is incident on the user's eye. The maximum value of display luminance that can be adjusted by the luminance adjustment unit OP1 may be determined so that (= T1 + T2) is equal to or less than a predetermined value. Therefore, in this case, the control unit 10 decreases the maximum value of the display luminance (that is, the light amount T1) that can be set by the luminance adjustment unit OP1 as the detected illuminance Id is higher. In other words, the control unit 10 increases the maximum value of the display luminance (that is, the light amount T1) that can be set by the luminance adjustment unit OP1 as the detected illuminance Id is lower. By doing in this way, when the external light such as daytime is strong, the control unit 10 increases the display luminance excessively by the luminance adjustment unit OP1 in order to increase the visibility for the user, and burdens the user's eyes. Can be suppressed.

(Modification 4)
The present invention is not limited to a head-up display, and is suitably applied to a display device such as a head-mounted display that is a display device worn on the user's head or an in-vehicle navigation device. Even when the present invention is applied to these display devices, the display device is provided with an illuminance sensor capable of detecting the illuminance, and the control unit of the display device, regardless of whether the automatic brightness adjustment function is valid or invalid, The display brightness is automatically adjusted based on the detected illuminance Id when the display device is turned on. Thereby, the display apparatus can suppress a user's eyes being dazzled at the time of lighting.

(Modification 5)
In the second modification, when the display brightness calculated in step S202 is equal to or higher than the currently set display brightness, the control unit 10 does not execute step S203, thereby manually setting the display brightness set in the brightness adjustment unit OP1. The light quantity of the laser emitted from the light source unit 1 was adjusted so as to obtain luminance. Instead, in the fifth modification, the control unit 10 sets the laser light amount so that the display luminance is equal to or lower than the display luminance calculated in step S202 and is higher than the manually set display luminance. And As an example, it is assumed that an intermediate value between the two is set. As a result, it is possible to display with display brightness that is optimal for the user.

The present invention can be suitably applied to a head-up display that allows a driver to visually recognize route guidance and vehicle information, a head-mounted display that is mounted on the head, and the like.

DESCRIPTION OF SYMBOLS 1 Light source unit 2 Combiner 5 Illuminance sensor 7 Support shaft part 10 Control part 20 Windshield 23 Bonnet 24 Dashboard

Claims

A light source for irradiating the display means with light for displaying an image;
Illuminance detection means for detecting illuminance;
First adjusting means for automatically adjusting the amount of light emitted from the light source according to the illuminance detected by the illuminance detecting means;
A second adjusting means for the user to arbitrarily adjust the amount of light emitted from the light source;
A setting unit that switches between a first state in which the adjustment by the first adjustment unit is performed and a second state in which the adjustment is not performed;
In the second state, when the light source is turned off from the off state, the light source is turned on with the light amount corresponding to the illuminance, and then adjusted by the second adjustment unit. Control means for enabling
A head-up display comprising:
When the control unit is in the second state, the light amount calculated according to the illuminance is set by the second adjustment unit when the light source is turned off from the off state. 2. The head-up display according to claim 1, wherein the light is emitted from the light source with a light amount lower than the light amount calculated according to the illuminance when the light amount is higher than the light amount.
When the control unit is in the second state, the light amount calculated according to the illuminance is set by the second adjustment unit when the light source is turned off from the off state. 3. The head-up display according to claim 1, wherein the light is emitted from the light source with a light amount set by the second adjustment unit when the light amount is higher than the light amount.
4. The head-up according to claim 1, wherein the display unit is a windshield or a combiner that reflects a light emitted from the light source to make a user recognize a virtual image. 5. display.
5. The head-up display according to claim 1, wherein the upper limit of the amount of light that can be adjusted by the second adjustment unit is changed in accordance with the illuminance detected by the illuminance detection unit. .
The upper limit of the light amount that can be adjusted by the second adjustment unit is lower when the illuminance detected by the illuminance detection unit is higher than when the illuminance is low. Head-up display.
First adjustment mode for automatically adjusting the amount of light emitted from the light source for irradiating the display unit with light for displaying an image to the amount of light according to the illuminance detected by the illuminance detection unit, and the user arbitrarily adjust Setting means that can be set to the second adjustment mode;
When the light source is turned off when the second adjustment mode is set, after turning on the emitted light amount with the light amount corresponding to the illuminance, the second light source is turned on. Control means for setting the adjustment mode;
A head-up display comprising:
A control method executed by a head-up display having a light source that irradiates display means with light for displaying an image,
An illuminance detection step for detecting illuminance;
A first adjustment step of automatically adjusting the amount of light emitted from the light source according to the illuminance detected by the illuminance detection step;
A second adjustment step for the user to arbitrarily adjust the amount of light emitted from the light source;
A setting step for switching and setting a first state in which the adjustment by the first adjustment step is performed and a second state in which the adjustment is not performed;
In the second state, when the light source is turned off from the off state, the light source is turned on with the light amount corresponding to the illuminance, and then adjusted by the second adjustment step. A control process that enables
A control method characterized by comprising:
A light source for irradiating the display means with light for displaying an image;
Illuminance detection means for detecting illuminance;
First adjusting means for automatically adjusting the amount of light emitted from the light source according to the illuminance detected by the illuminance detecting means;
A second adjusting means for the user to arbitrarily adjust the amount of light emitted from the light source;
A setting unit that switches between a first state in which the adjustment by the first adjustment unit is performed and a second state in which the adjustment is not performed;
In the second state, when the light source is turned off from the off state, the light source is turned on with the light amount corresponding to the illuminance, and then adjusted by the second adjustment unit. Control means for enabling
A display device comprising: