JP6887373B2 - Head-up display system - Google Patents

Description

The present invention relates to a technique for protecting a head-up display from heating by external light.

As a technology to protect the head-up display from heating, there are a liquid crystal panel that displays an image and a backlight equipped with a plurality of LEDs that are provided corresponding to each area of the liquid crystal panel and illuminate each corresponding area from the rear. In a head-up display equipped with a projection optical system that projects the light transmitted forward through the liquid crystal panel onto the front windshield, the image of the liquid crystal panel is displayed when the temperature of the liquid crystal panel exceeds a predetermined temperature. A technique is known in which an area is limited, only the LED that illuminates the limited area is turned on, and the heating of the liquid crystal panel by the backlight is suppressed (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-45244

According to the above-mentioned technique of limiting the area for displaying the image of the liquid crystal panel when the temperature of the liquid crystal panel exceeds a predetermined temperature and lighting only the LED that illuminates the limited area, the liquid crystal panel When the temperature is equal to or higher than a predetermined temperature, the image size that can be displayed on the head-up display has to be smaller than usual, and the display capability of the head-up display is lower than usual.

Further, according to this technique, the heating of the liquid crystal panel by the backlight can be suppressed, but the heating of the liquid crystal panel itself by the external light cannot suppress this.
Therefore, it is an object of the present invention to provide a head-up display capable of preventing heating of a liquid crystal panel by external light without lowering the display ability.

In order to achieve the above problems, the present invention presents a head-up display system that projects an image toward the front windshield of an automobile, a liquid crystal panel, and a portion of the liquid crystal panel arranged within a predetermined projection range. The liquid crystal panel controls the projection optical system that projects the displayed image toward the front windshield, the moving mechanism that moves the liquid crystal panel, the display means that displays the image on the liquid crystal panel, and the moving mechanism. A liquid crystal panel arrangement control means for switching between the first portion and the second portion, and at least a portion of the liquid crystal panel arranged within the projected range. It is provided with a temperature detecting means for detecting the temperature of the liquid crystal display. Here, the liquid crystal panel arrangement control means is arranged within the projected range of the liquid crystal panel detected by the temperature detecting means when the first portion is arranged within the projected range. When the temperature of the portion exceeds a predetermined temperature, the portion of the liquid crystal panel arranged within the projected range is switched to the second portion, and the second portion is arranged within the projected range. When the temperature of the portion of the liquid crystal panel arranged within the projected range detected by the temperature detecting means exceeds the predetermined temperature, the liquid crystal panel is arranged within the projected range. The portion to be displayed is switched to the first portion, and the display means displays an image on the first portion when the first portion is arranged within the projection range, and the second portion is displayed. When the portion is arranged within the projected range, the image is displayed on the second portion.

Further, in order to achieve the above task, an image displayed on a liquid crystal panel and a portion of the liquid crystal panel arranged within the projected range on a head-up display system that projects an image toward the front windshield of an automobile. A projection optical system composed of a set of one or a plurality of optical components, a display means for displaying an image on the liquid crystal panel, and an arrangement or projection of the at least one optical component. By changing the optical components included in the set constituting the optical system, the arrangement of the projected range is changed to the arrangement in which the first portion of the liquid crystal panel is arranged within the projected range and the projected range. A projected range arrangement switching means for switching between an arrangement in which the second portion of the liquid crystal panel is arranged within the range, and a temperature for detecting the temperature of at least the portion of the liquid crystal panel arranged within the projected range. It is equipped with a detection means. Here, the projected range arrangement switching means is arranged within the projected range of the liquid crystal panel detected by the temperature detecting means when the first portion is arranged within the projected range. When the temperature of the portion exceeds a predetermined temperature, the arrangement of the projected range is switched to the arrangement in which the second portion of the liquid crystal panel is arranged within the projected range, and the second portion is said. When the temperature of the portion of the liquid crystal panel detected by the temperature detecting means that is arranged within the projected range exceeds a predetermined temperature while being arranged within the projected range, the projected range is determined. The arrangement is switched to an arrangement in which the first portion of the liquid crystal panel is arranged within the projected range, and the display means is such that when the first portion is arranged within the projected range, the first portion is arranged. The image is displayed in the portion of, and when the second portion is arranged within the projected range, the image is displayed in the second portion.

According to the head-up display system as described above, any one of the first portion and the second portion of the liquid crystal panel is arranged within the projected range and used for displaying an image to be selectively projected. If the temperature of the first part becomes higher than the predetermined temperature when the first part is arranged within the projected range and used for displaying an image, it is arranged within the projected range. Then, when the part used for displaying the image is switched to the second part and the temperature of the first part becomes higher than the predetermined temperature when the second part is used for displaying the image, the projected range The part arranged inside and used for displaying the image is switched to the first part.

Therefore, a specific part of the liquid crystal panel continues to be heated excessively by sunlight focused in the direction opposite to the projection direction of the image by the projection optical system on the part arranged within the projected range of the liquid crystal panel. It is possible to prevent the temperature from becoming high, and it is possible to suppress the occurrence of a failure of the liquid crystal panel and a display defect. Further, since the sizes of the first portion and the second portion of the liquid crystal panel can be made equal to each other, heating of the liquid crystal panel can be prevented without lowering the display capacity of the head-up display.

Further, in order to achieve the above-mentioned problems, the present invention presents a liquid crystal panel and the liquid crystal panel arranged within a predetermined projection range on a head-up display system that projects an image toward the front windshield of an automobile. A projection optical system that projects the image displayed on the portion toward the front windshield, a moving mechanism that moves the liquid crystal panel, a display means that displays the image on the liquid crystal panel, and within the projected range of the liquid crystal panel. The liquid crystal panel movement control means for moving the liquid crystal panel to the movement mechanism is provided so that the portion arranged in the above can be gradually changed. Here, at each time point, the display means displays an image on a portion of the liquid crystal panel arranged within the projected range at that time point.

According to the head-up display system as described above, the portion used for displaying the image to be projected by being arranged within the projected range of the liquid crystal panel gradually changes, so that the portion is arranged within the projected range of the liquid crystal panel. It is possible to prevent a specific part of the liquid crystal panel from being continuously heated and becoming excessively hot due to sunlight focused on the part in the direction opposite to the projection direction of the image by the projection optical system. It is possible to suppress the occurrence of liquid crystal panel failure and display failure. Further, at each time point, the size of the part of the liquid crystal panel used for displaying the image to be projected by arranging it within the projected range can be made equal, so that the display capacity of the head-up display can be reduced without lowering the display capacity of the liquid crystal panel. Heating can be prevented.

Further, in order to achieve the above-mentioned problems, the present invention is a head-up display system that projects an image toward the front windshield of an automobile, in which two liquid crystal panels are arranged within a predetermined projection range. A projection optical system that projects an image displayed on a liquid crystal panel toward a front windshield, a moving mechanism that moves the two liquid crystal panels, a display means that displays the image on the two liquid crystal panels, and the above. A liquid crystal panel arrangement control means that controls the movement mechanism to switch the liquid crystal panel arranged within the projected range between the two liquid crystal panels, and at least the temperature of the liquid crystal panel arranged within the projected range. It is provided with a temperature detecting means for detecting the above. Here, in the liquid crystal panel arrangement control means, one of the two liquid crystal panels is a first liquid crystal panel, the other liquid crystal panel is a second liquid crystal panel, and the first liquid crystal panel is the first liquid crystal panel. When the temperature of the liquid crystal panel arranged in the projected range detected by the temperature detecting means exceeds a predetermined temperature when the liquid crystal panel is arranged in the projected range, the liquid crystal panel is arranged in the projected range. The liquid crystal panel is switched to the front second liquid crystal panel, and when the second liquid crystal panel is arranged within the projected range, the liquid crystal panel is arranged within the projected range detected by the temperature detecting means. When the temperature of the liquid crystal panel exceeds a predetermined temperature, the liquid crystal panel arranged within the projected range is switched to the front first liquid crystal panel. Further, when the first liquid crystal panel is arranged within the projected range, the display means displays an image on the first liquid crystal panel, and the second liquid crystal panel is within the projected range. Is arranged, an image is displayed on the second liquid crystal panel.

Further, in order to achieve the above-mentioned problems, the present invention relates to a head-up display system that projects an image toward the front windshield of an automobile, two liquid crystal panels, and the liquid crystal panels arranged within the projected range. At least one, a projection optical system composed of one or a set of optical components for projecting the displayed image toward the front windshield, and a display means for displaying the image on the two liquid crystal panels. By changing the arrangement of the optical components or the optical components included in the set constituting the projection optical system, the arrangement of the projected range is set within the projected range of one of the two liquid crystal panels. A projected range arrangement switching means for switching between an arrangement in which the liquid crystal panel is arranged and an arrangement in which the other liquid crystal panel of the two liquid crystal panels is arranged within the projected range, and at least the projected range. It is provided with a temperature detecting means for detecting the temperature of the liquid crystal panel arranged inside. Here, in the projection range arrangement switching means, one of the two liquid crystal panels is used as the first liquid crystal panel, the other liquid crystal panel is used as the second liquid crystal panel, and the first liquid crystal panel is used. When the temperature of the liquid crystal panel arranged in the projected range detected by the temperature detecting means exceeds a predetermined temperature when the liquid crystal panel is arranged in the projected range, the arrangement of the projected range is arranged. The second liquid crystal panel is arranged within the projected range, and the temperature detecting means detects the subject when the second liquid crystal panel is arranged within the projected range. When the temperature of the liquid crystal panel arranged in the projection range exceeds a predetermined temperature, the arrangement of the projected range is switched to the arrangement in which the first liquid crystal panel is arranged in the projected range. Further, when the first liquid crystal panel is arranged within the projected range, the display means displays an image on the first liquid crystal panel, and the second liquid crystal panel is within the projected range. Is arranged, an image is displayed on the second liquid crystal panel.

According to the head-up display system as described above, any one of the two liquid crystal panels can be arranged within the projected range and used for displaying an image to be selectively projected, and one liquid crystal panel can be used. If the temperature of one of the liquid crystal panels becomes higher than the predetermined temperature when the liquid crystal is placed within the projected range and used for displaying an image, the liquid crystal placed within the projected range and used for displaying the image Switch the panel to the other LCD panel.

Therefore, a specific part of the liquid crystal panel continues to be heated by sunlight focused in the direction opposite to the projection direction of the image by the projection optical system on the liquid crystal panel arranged within the projected range, resulting in excessively high temperature. It is possible to prevent this from happening, and it is possible to suppress the occurrence of a failure of the liquid crystal panel or a display defect. Further, since the sizes of the two liquid crystal panels can be made equal, it is possible to prevent the liquid crystal panels from heating without lowering the display capacity of the head-up display.

Here, in each of the above head-up display systems, the projection optical system includes, for example, a concave mirror.

As described above, according to the present invention, it is possible to provide a head-up display capable of preventing heating of a liquid crystal panel by external light without lowering the display ability.

It is a block diagram which shows the structure of the in-vehicle system which concerns on embodiment of this invention. It is a figure which shows the arrangement and structure of the head-up display which concerns on embodiment of this invention. It is a flowchart which shows the heat prevention treatment which concerns on embodiment of this invention. It is a figure which shows the processing example of the heat prevention treatment which concerns on embodiment of this invention. It is a figure which shows the other structural example of the head-up display which concerns on embodiment of the invention. It is a figure which shows the other structural example of the head-up display which concerns on embodiment of the invention. It is a figure which shows the other processing example of the heat prevention treatment which concerns on embodiment of this invention. It is a figure which shows the other structural example of the head-up display which concerns on embodiment of the invention. It is a figure which shows the other structural example of the head-up display which concerns on embodiment of the invention. ..

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows the configuration of the in-vehicle system according to the present embodiment.
The in-vehicle system is a system mounted on an automobile, and includes a head-up display 1 and a data processing device 2 that performs various processes while displaying using the head-up display 1 as shown in the figure.

Further, the head-up display 1 has a liquid crystal panel 11 such as a TFT liquid crystal panel that displays an image transferred from the data processing device 2, a backlight 12 that illuminates the liquid crystal panel 11 from the rear, and a liquid crystal panel 11 in the front. The projection optical system 13 that projects the transmitted light onto the front windshield, the display controller 14 that controls the display of the image transferred from the data processing device 2 on the liquid crystal panel 11, and the temperature of each area of the liquid crystal panel 11 are detected. It is provided with a plurality of temperature sensors 15 and a liquid crystal panel moving mechanism 16 that changes the position of the liquid crystal panel 11.

Here, as shown in FIG. 2a, the head-up display 1 displays a virtual image VI of the image in front of the automobile by projecting an image from below onto the front windshield in front of the driver's seat.

FIG. 2b shows the internal structure of the head-up display 1. The head-up display 1 has a housing 101 and a housing, with the vertical-front-back direction shown in FIG. 2b as the vertical-front-back direction of the head-up display 1. A transparent cover glass 102 that covers the upper portion of the 101 is provided, and each part of the head-up display 1 described above is housed in a space surrounded by the housing 101 and the cover glass 102.

Further, the head-up display 1 includes a main mirror 131 and a concave mirror 132 as the projection optical system 13.
Further, the liquid crystal panel 11 is supported above the backlight 12 so as to be movable back and forth by the liquid crystal panel moving mechanism 16.

Further, the head-up display 1 is provided with a plurality of temperature sensors 15 so as to be able to detect the temperature of the front portion and the temperature of the rear portion of the liquid crystal panel 11 regardless of the position of the liquid crystal panel 11.
In the figure, a case where a non-contact type temperature sensor 15 such as a radiation thermometer is provided as the temperature sensor 15 is shown, but as the temperature sensor 15, a plurality of contact type temperature sensors 15 are used on the liquid crystal panel 11. Even if it is arranged and used on the side portion of the front portion and the side edge of the rear portion so that the temperature of the front portion and the temperature of the rear portion of the liquid crystal panel 11 can be detected regardless of the position of the liquid crystal panel 11. Good.

Here, as the liquid crystal panel moving mechanism 16 for moving the liquid crystal panel 11, for example, as shown in FIG. 2c, a screw 161 having an axial direction in the front-rear direction, a ball screw nut 162 fixed to the liquid crystal panel 11, and a screw 161 A ball screw mechanism including a motor 163 that can be controlled from the data processing device 2 and a guide 164 that guides the movement of the liquid crystal panel 11 in the front-rear direction can be used.

Then, in such a structure of the head-up display 1, the light of the backlight 12 irradiates the portion of the liquid crystal panel 11 arranged in the projected range indicated by A in the drawing from below, and covers the liquid crystal panel 11. The light transmitted through the portion in the projection range A is reflected by the concave mirror 132, reflected by the main mirror 131, and projected onto the front windshield.

By the way, in such a head-up display 1, depending on the positional relationship between the sun and the head-up display 1, as shown in the figure, sunlight enters the concave mirror 132 in the order of the main mirror 131 and the concave mirror 132, and the concave mirror 132 causes the concave mirror 132. , The light may be focused on a position within the projected range A of the liquid crystal panel 11. In such a case, when the position of the liquid crystal panel 11 is fixed, the position where the sunlight of the liquid crystal panel 11 is collected is excessively heated, which may cause a failure of the liquid crystal panel 11 or a display defect.

As shown in FIG. 2b, the head-up display 1 may be configured so that a portion of the liquid crystal panel 11 other than the portion in the projected range A is shielded from light from the concave mirror 132. However, if the arrangement of each part of the head-up display 1 is such that there is no possibility that sunlight is collected by the concave mirror 132 other than the portion within the projection range A of the liquid crystal panel 11, the liquid crystal panel 11 It is not necessary to shield the concave mirror 132 from the portion other than the portion in the projected range A of the above.

Hereinafter, in such a configuration, the heat prevention treatment performed by the data processing device 2 to prevent the liquid crystal panel 11 from being heated will be described.
FIG. 3 shows the procedure of this heat prevention treatment.
As shown in the figure, in the heat prevention process, the data processing device 2 first controls the liquid crystal panel moving mechanism 16 and sets the position of the liquid crystal panel 11 to the first position (step 302).
Here, as shown in FIG. 4a1, the first position is a position where the first region r1, which is a rear portion of the liquid crystal panel 11, is within the projection range A, and is a front portion of the liquid crystal panel 11. The position of the liquid crystal panel 11 in which the two regions r2 are located in front of the projection range A. The first region r1 and the second region r2 of the liquid crystal panel 11 are set so that there is no overlapping region. Further, in the present embodiment, the liquid crystal panel 11 is arranged so that the rear side of the liquid crystal panel 11 is above the display screen of the liquid crystal panel 11 and the front side of the liquid crystal panel 11 is below the display screen of the liquid crystal panel 11.

Then, next, the display area of the liquid crystal panel 11 is set to the first area r1 (step 304).
Here, the data processing device 2 displays an image in the first region r1 as shown in FIG. 4a2 during the period in which the first region r1 is set as the display region.
Next, when the first region r1 is set as the display region (step 304), the temperature of the first region r1 which is the rear portion of the liquid crystal panel 11 detected by the temperature sensor 15 becomes a predetermined temperature Th or more. (Step 306). Here, the temperature Th is an upper limit of the temperature at which normal operation of the liquid crystal panel 11 can be guaranteed, or a temperature obtained by subtracting a predetermined margin from the upper limit.

Then, when the temperature of the first region r1 exceeds the temperature Th, it is checked whether the temperature of the second region r2, which is the front portion of the liquid crystal panel 11, exceeds the temperature Th (step 308), and the second region If the temperature of r2 is not higher than the temperature Th, the liquid crystal panel moving mechanism 16 is controlled to set the position of the liquid crystal panel 11 to the second position (step 310).

Here, in the second position, as shown in FIG. 4b1, the second region r2, which is the front portion of the liquid crystal panel 11, is within the projection range A, and the first region r1 is the rear portion of the liquid crystal panel 11. The position is the position of the liquid crystal panel 11 which is located behind the projection range A.

Then, next, the display area of the liquid crystal panel 11 is set to the second area r2 (step 312).
Here, the data processing device 2 displays an image in the second area r2 as shown in FIG. 4b2 during the period in which the second area r2 is set as the display area.
Then, it is monitored that the temperature of the second region r2 of the liquid crystal panel 11 detected by the temperature sensor 15 exceeds the predetermined temperature Th (step 314).
Then, when the temperature of the second region r2 exceeds the predetermined temperature Th, it is checked whether the temperature of the first region r1 of the liquid crystal panel 11 exceeds the temperature Th (step 316), and the temperature of the first region r1 is increased. If the temperature does not exceed the temperature Th, the process returns to the process from step 302.

On the other hand, in step 308, it is determined that the temperature of the second region r2 of the liquid crystal panel 11 exceeds the temperature Th, and in step 316, it is determined that the temperature of the first region r1 of the liquid crystal panel 11 exceeds the temperature Th. In this case, since the temperatures of both the first region r1 and the second region r2 of the liquid crystal panel 11 exceed the temperature Th, the display of the head-up display 1 is stopped and the head-up display 1 is heated by sunlight. In the shutdown process, the backlight 12 is turned off and the protection mechanism provided in the head-up display 1 prevents sunlight from entering the liquid crystal panel 11. Do. Here, as this protection mechanism, a shutter that shields the inside of the head-up display 1 from the outside in a closed state, a mechanism that rotates the main mirror 131 and the concave mirror 132, and the like can be used, and the shutter is provided as a protection mechanism. In that case, in the shutdown process, the shutter is transitioned to the closed state, and when a mechanism for rotating the main mirror 131 and the concave mirror 132 is provided as a protection mechanism, the shutdown process involves the main mirror 131 and the concave mirror 132. Rotation is performed at an angle at which sunlight does not enter the liquid crystal panel 11.
Then, the temperature of both the first region r1 and the second region r2 of the liquid crystal panel 11 is waited to be less than the temperature Th (step 320), and if both temperatures are both less than the temperature Th, the head-up is performed. A return process for returning the state of the display 1 to the state before the shutdown process is performed in step 318 is performed (step 322), and the process returns to the process from step 302. That is, in the return process of step 322, in addition to turning on the backlight 12, when the shutter is provided as a protection mechanism, a mechanism for transitioning to the open state of the shutter and rotating the main mirror 131 and the concave mirror 132 is provided. When provided as a protection mechanism, the main mirror 131 and the concave mirror 132 are rotated to return to the angle shown in FIG. 2b.

The heat prevention treatment performed by the data processing device 2 has been described above.
According to the in-vehicle system as described above, any one of the first region r1 and the second region r2 of the liquid crystal panel 11 can be selectively used for displaying an image projected on the front windshield. If the temperature of the first region r1 becomes higher than the predetermined temperature when the first region r1 is used for displaying the image, the region used for displaying the image is arranged in the projection range A and the region used for displaying the image is the second region r2. If the temperature of the second region r2 becomes higher than the predetermined temperature when the second region r2 is used for displaying the image, the region used for displaying the image is set within the projection range A. Switch to 1 area r1.

Therefore, it is possible to prevent a specific portion of the liquid crystal panel 11 from being continuously heated to an excessively high temperature by the sunlight focused on the area used for displaying the liquid crystal panel 11, and the liquid crystal panel can be prevented from becoming excessively high. It is possible to suppress the occurrence of 11 failures and display defects. Further, since the sizes of the first region r1 and the second region r2 of the liquid crystal panel 11 can be made equal to each other, it is possible to prevent the liquid crystal panel 11 from being heated without lowering the display capacity of the head-up display 1.

By the way, in the above embodiment, the projected range is the range in which the image displayed on the liquid crystal panel 11 is projected on the front windshield, and is also the range of the liquid crystal panel 11 in which sunlight may be condensed. The range of the liquid crystal panel 11 located in A was switched between the first region r1 and the second region r2 by moving the liquid crystal panel 11, as shown in FIGS. 5a1 and 5b1. By moving the concave mirror 132, the projected range A may be moved so that the range of the liquid crystal panel 11 located in the projected range A is switched between the first region r1 and the second region r2. ..
In this case, the backlight 12 is provided so as to illuminate both the first region r1 and the second region r2 of the liquid crystal panel 11, or moves in conjunction with the movement of the projected range A, so that the first region r1 and the second region r2 are illuminated. The region of the region r1 and the second region r2 located in the projected range A is illuminated.

5a2 shows the display of the liquid crystal panel 11 when the projected range A is set to a range overlapping the first region r1 as shown in FIG. 5a1, and FIG. 5b2 shows the display of the liquid crystal panel 11 as shown in FIG. 5b1. It represents the display of the liquid crystal panel 11 performed when the projection range A is set to a range overlapping the second region r2.

Here, when the magnification of the projection optical system 13 changes due to the movement of the concave mirror 132, the liquid crystal panel 11 in the data processing device 2 absorbs the change as shown in FIGS. 5a2 and 5a2. Change the size of the image displayed on.

It should be noted that such movement of the projected range A is realized by moving both the main mirror 131, the concave mirror 132 and the main mirror 131, or rotating at least one of the concave mirror 132 and the main mirror 131. May be good.

Further, the range of the liquid crystal panel 11 located in the projected range A due to the movement of the projected range A as described above can be switched between the first region r1 and the second region r2 by using the concave mirror 132 or the main mirror 131. Separately, it may be realized by providing a mirror for changing the optical path between the concave mirror 132 and the liquid crystal panel 11.

That is, for example, as shown in FIGS. 6a1 and 6b1, a fixed mirror 601 and a movable mirror 602 that can be moved back and forth are provided as mirrors for changing the optical path between the concave mirror 132 and the liquid crystal panel 11. Then, when the range of the liquid crystal panel 11 located in the projected range A is set to the first region r1, the movable mirror 602 is moved to a position outside the space between the first region r1 and the concave mirror 132 as shown in FIG. 6a1. Therefore, the image displayed in the first region r1 is directly incident on the concave mirror 132. Further, when the range of the liquid crystal panel 11 located in the projected range A is defined as the second region r2, as shown in FIG. 6b1, the movable mirror 602 is moved between the first region r1 and the concave mirror 132 to obtain a second region r2. The image displayed in the region r2 is reflected by the fixed mirror 601 and the movable mirror 602 so as to be incident on the concave mirror 132.
Also in this case, the backlight 12 is provided so as to illuminate both the first region r1 and the second region r2 of the liquid crystal panel 11, or moves in conjunction with the movement of the projected range A, so that the first region r1 and the second region r2 are illuminated. The region of the region r1 and the second region r2 located in the projected range A is illuminated.

Note that FIG. 6a2 shows the display of the liquid crystal panel 11 when the projected range A is set to a range overlapping the first region r1 as shown in FIG. 6a1, and FIG. 6b2 shows the display of the liquid crystal panel 11 as shown in FIG. 6b1. It represents the display of the liquid crystal panel 11 performed when the projection range A is set to a range overlapping the second region r2.

Further, in the above embodiment, the range of the liquid crystal panel 11 located in the projected range A is switched between the first region r1 and the second region r2, but this moves the liquid crystal panel 11 back and forth. As shown in FIGS. 7a1, a2, a3, and a4, the liquid crystal panel 11 may be constantly reciprocated back and forth so that the range of the liquid crystal panel 11 located in the projected range A is constantly changed. ..

Note that FIGS. 7b1, b2, b3, and b4 represent the display of the liquid crystal panel 11 when the liquid crystal panel 11 is at the position shown in FIGS. 7a1, a2, a3, and a4, respectively. As shown in the figure, the data processing device 2 displays an image in the display area with the range of the liquid crystal panel 11 located in the projection range A as the display area at that time.

Even in this way, it is possible to prevent only a specific portion of the liquid crystal panel 11 from being continuously heated by the condensing of sunlight and becoming excessively high in temperature.
Further, in the above embodiment, a single liquid crystal panel 11 is used as the liquid crystal panel 11, but as shown in FIGS. 8a1 and 8a1 and b1, the first liquid crystal panel 111 and the second liquid crystal panel 112 are used as the liquid crystal panel 11. May be provided so as to be movable back and forth by the liquid crystal panel moving mechanism 16, and the display screen of the first liquid crystal panel 111 may be used as the first region r1 and the display screen of the second liquid crystal panel 112 may be used as the second region r2.

That is, in this case, in the heat prevention treatment shown in FIG. 3, in the first position, as shown in FIG. 8a1, the first region r1 which is the display screen of the first liquid crystal panel 111 is within the projection range A. As shown in FIG. 8b1, the second position is a position where the second region r2, which is the display screen of the second liquid crystal panel 112, is within the projection range A.

Note that FIG. 8a2 shows the display of the first liquid crystal panel 111 and the second display panel when the first region r1, that is, the first liquid crystal panel 111 is set to a range overlapping the projected range A as shown in FIG. 8a1. 8b2 shows the display of the first liquid crystal panel 111 and the second display panel when the second region r2, that is, the second liquid crystal panel 112 is set to a range overlapping the projection range A as shown in FIG. 8b1. Represents.

By the way, when the first liquid crystal panel 111 and the second liquid crystal panel 112 are provided as the liquid crystal panel 11 in this way, the range of the liquid crystal panel 11 located in the projected range A is set to the first region r1 (first liquid crystal panel 111). The movement of the first liquid crystal panel 111 and the second liquid crystal panel 112 for switching between the second region r2 and the second region r2 (second liquid crystal panel 112) is as shown in FIGS. 9a1 and 9b1. Even if the second liquid crystal panel 112 is provided above and below the backlight 12 with the back light 12 side as the back side, and the first liquid crystal panel 111 and the second liquid crystal panel 112 are rotated around the position of the backlight 12. Good.

Note that FIG. 9a2 shows the display of the first liquid crystal panel 111 and the second display panel, which is performed when the projected range A is set to a range that overlaps the first region r1, that is, the first liquid crystal panel 111, as shown in FIG. 9a1. 9b2 shows the display of the first liquid crystal panel 111 and the second display panel when the projected range A is set to the second region r2, that is, the range overlapping the second liquid crystal panel 112 as shown in FIG. 8b1. Represents.

Further, even when the first liquid crystal panel 111 and the second liquid crystal panel 112 are provided as the liquid crystal panel 11 as described above, the first liquid crystal panel is similarly provided as the case where the single liquid crystal panel 11 is provided as the liquid crystal panel 11. Instead of moving the 111 and the second liquid crystal panel 112, the projected range A may be moved to switch the liquid crystal panel located in the projected range A between the first liquid crystal panel 111 and the second liquid crystal. Good.

That is, even when the first liquid crystal panel 111 and the second liquid crystal panel 112 are provided as the liquid crystal panel 11, the projected range A is increased by moving or rotating the concave mirror 132 or the main mirror 131, as in the case shown in FIG. By moving, the liquid crystal panel located in the projected range A can be switched between the first liquid crystal panel 111 and the second liquid crystal, or between the concave mirror 132 and the liquid crystal panel 11 as in the case shown in FIG. The projected range A may be moved by providing a mirror for changing the optical path, and the liquid crystal panel located in the projected range A may be switched between the first liquid crystal panel 111 and the second liquid crystal panel 112. ..

1 ... head-up display, 2 ... data processing device, 11 ... liquid crystal panel, 12 ... backlight, 13 ... projection optical system, 14 ... display controller, 15 ... temperature sensor, 16 ... liquid crystal panel moving mechanism, 101 ... housing, 102 ... Cover glass, 111 ... First liquid crystal panel, 112 ... Second liquid crystal panel, 131 ... Main mirror, 132 ... Concave mirror, 161 ... Screw, 162 ... Ball screw nut, 163 ... Motor, 164 ... Guide, 601 ... Fixed mirror, 602 ... Movable mirror.

Claims (6)

A head-up display system that projects an image toward the front windshield of an automobile.
LCD panel and
A projection optical system that projects an image displayed on a portion of the liquid crystal panel arranged within a predetermined projection range toward the front windshield, and a projection optical system.
A moving mechanism that moves the LCD panel,
A display means for displaying an image on the liquid crystal panel and
A liquid crystal panel arrangement control means that controls the movement mechanism to switch a portion of the liquid crystal panel arranged within the projected range between the first portion and the second portion.
It has at least a temperature detecting means for detecting the temperature of a portion of the liquid crystal panel arranged within the projected range.
The liquid crystal panel arrangement control means is the temperature of the portion of the liquid crystal panel arranged within the projected range detected by the temperature detecting means when the first portion is arranged within the projected range. When the temperature exceeds a predetermined temperature, the portion of the liquid crystal panel arranged within the projected range is switched to the second portion, and the second portion is arranged within the projected range. In addition, when the temperature of the portion of the liquid crystal panel arranged within the projected range detected by the temperature detecting means exceeds the predetermined temperature, the portion arranged within the projected range of the liquid crystal panel. To the first part,
When the first portion is arranged within the projected range, the display means displays an image on the first portion, and the second portion is arranged within the projected range. A head-up display system, sometimes characterized by displaying an image in the second portion. A head-up display system that projects an image toward the front windshield of an automobile.
LCD panel and
A projection optical system composed of a set of one or a plurality of optical components for projecting an image displayed on a portion of the liquid crystal panel arranged within the projection range toward the front windshield, and a projection optical system.
A display means for displaying an image on the liquid crystal panel and
By changing the arrangement of at least one of the optical components or the optical components included in the set constituting the projection optical system, the arrangement of the projected range is set within the projected range of the first liquid crystal panel. A projected range arrangement switching means for switching between an arrangement in which the portions are arranged and an arrangement in which the second portion of the liquid crystal panel is arranged within the projected range.
It has at least a temperature detecting means for detecting the temperature of a portion of the liquid crystal panel arranged within the projected range.
The projected range arrangement switching means is a portion of the liquid crystal panel arranged within the projected range detected by the temperature detecting means when the first portion is arranged within the projected range. When the temperature exceeds a predetermined temperature, the arrangement of the projected range is switched to the arrangement in which the second portion of the liquid crystal panel is arranged within the projected range, and the second portion is the projected range. When the temperature of the portion of the liquid crystal panel detected by the temperature detecting means that is arranged within the projected range exceeds a predetermined temperature, the projected range is arranged. Switch to an arrangement in which the first portion of the liquid crystal panel is arranged within the projected range,
When the first portion is arranged within the projected range, the display means displays an image on the first portion, and the second portion is arranged within the projected range. A head-up display system, sometimes characterized by displaying an image in the second portion. A head-up display system that projects an image toward the front windshield of an automobile.
LCD panel and
A projection optical system that projects an image displayed on a portion of the liquid crystal panel arranged within a predetermined projection range toward the front windshield, and a projection optical system.
A moving mechanism that moves the LCD panel,
A display means for displaying an image on the liquid crystal panel and
It has a liquid crystal panel movement control means for moving the liquid crystal panel to the moving mechanism so that a portion of the liquid crystal panel arranged within the projected range continues to change gradually.
The display means is a head-up display system characterized in that, at each time point, an image is displayed on a portion of the liquid crystal panel arranged within the projected range at that time point. A head-up display system that projects an image toward the front windshield of an automobile.
Two LCD panels and
A projection optical system that projects an image displayed on the liquid crystal panel arranged within a predetermined projection range toward the front windshield, and
A moving mechanism that moves the two liquid crystal panels,
A display means for displaying an image on the two liquid crystal panels and
A liquid crystal panel arrangement control means that controls the movement mechanism to switch the liquid crystal panel arranged within the projection range between the two liquid crystal panels.
It has at least a temperature detecting means for detecting the temperature of the liquid crystal panel arranged within the projection range.
In the liquid crystal panel arrangement control means, one of the two liquid crystal panels is a first liquid crystal panel, the other liquid crystal panel is a second liquid crystal panel, and the first liquid crystal panel is the projection range. When the temperature of the liquid crystal panel arranged in the projected range detected by the temperature detecting means exceeds a predetermined temperature, the liquid crystal panel arranged in the projected range is arranged inside. To the front second liquid crystal panel, and when the second liquid crystal panel is arranged within the projected range, the liquid crystal panel arranged within the projected range detected by the temperature detecting means When the temperature exceeds a predetermined temperature, the liquid crystal panel arranged within the projected range is switched to the front first liquid crystal panel.
When the first liquid crystal panel is arranged in the projected range, the display means displays an image on the first liquid crystal panel, and the second liquid crystal panel is arranged in the projected range. A head-up display system, characterized in that an image is displayed on the second liquid crystal panel when the display is performed. A head-up display system that projects an image toward the front windshield of an automobile.
Two LCD panels and
A projection optical system composed of a set of one or a plurality of optical components for projecting an image displayed on the liquid crystal panel arranged within the projection range toward the front windshield, and a projection optical system.
A display means for displaying an image on the two liquid crystal panels and
By changing the arrangement of at least one of the optical components or the optical components included in the set constituting the projection optical system, the arrangement of the projected range can be set within the projected range of the two liquid crystal panels. A projected range arrangement switching means for switching between an arrangement in which one liquid crystal panel is arranged and an arrangement in which the other liquid crystal panel of the two liquid crystal panels is arranged within the projected range.
It has at least a temperature detecting means for detecting the temperature of the liquid crystal panel arranged within the projection range.
In the projection range arrangement switching means, one liquid crystal panel of the two liquid crystal panels is used as a first liquid crystal panel, the other liquid crystal panel is used as a second liquid crystal panel, and the first liquid crystal panel is projected. When the temperature of the liquid crystal panel arranged in the projected range detected by the temperature detecting means exceeds a predetermined temperature when the liquid crystal panel is arranged in the range, the arrangement of the projected range is changed. Within the projected range detected by the temperature detecting means when the second liquid crystal panel is arranged within the projected range and the second liquid crystal panel is arranged within the projected range. When the temperature of the liquid crystal panel arranged in the above exceeds a predetermined temperature, the arrangement of the projected range is switched to the arrangement in which the first liquid crystal panel is arranged within the projected range.
When the first liquid crystal panel is arranged in the projected range, the display means displays an image on the first liquid crystal panel, and the second liquid crystal panel is arranged in the projected range. A head-up display system, characterized in that an image is displayed on the second liquid crystal panel when the display is performed. The head-up display system according to claim 1, 2, 3, 4 or 5.
The projection optical system is a head-up display system including a concave mirror.

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