JP5391730B2 - Display device and head-up display system - Google Patents

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device using field sequential driving.

  Conventionally, a liquid crystal display device using field sequential driving is known (see, for example, Patent Document 1). The liquid crystal display device described in Patent Document 1 includes a plurality of light sources and a liquid crystal panel provided so as to face the plurality of light sources, and sequentially emits the plurality of light sources to correspond to each of the plurality of light sources. Field sequential driving for sequentially displaying color images on a liquid crystal panel is used. In field sequential driving, images of colors corresponding to each of a plurality of light sources are sequentially displayed on the liquid crystal panel, so that the observer can display the color of the light source or a color resulting from additive color mixing of the colors of the plurality of light sources. Is recognized as being.

JP 2003-295105 A

  However, in the liquid crystal display device using the field sequential drive described in Patent Document 1, the time for each of the plurality of light sources to emit light is shortened during one field (while one image is displayed). Specifically, since the time of one field is divided by the number of light sources, the light emission of the light source is displayed when displaying a monochrome image (abbreviation of monochrome, the same applies hereinafter) during one field. There is a problem that the image becomes darker as the time required for the operation becomes shorter.

  The present invention has been made to solve the above-described problems, and one object of the present invention is a liquid crystal display capable of suppressing darkening of an image when displaying a monochrome image. Is to provide a device.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, a liquid crystal display device according to one aspect of the present invention includes a plurality of light sources and a liquid crystal panel provided to face the plurality of light sources, and sequentially emits the plurality of light sources. , Field sequential drive for displaying a plurality of colors by sequentially displaying images of colors corresponding to each of the plurality of light sources on a liquid crystal panel, and simultaneously emitting one or more light sources of the plurality of light sources Therefore, it is configured to switch between driving to display a monochrome image on the liquid crystal panel, and switching between field sequential driving and driving to display a monochrome image on the liquid crystal panel based on the brightness around the device. It is configured to be. The driving for displaying a monochrome image on the liquid crystal panel means that one color or a plurality of light sources emits light continuously and continuously in one field period, so that one color (for example, red, green or Blue) or a mixed color by a plurality of light sources (for example, black and white by a mixed color of red, green and blue).

  In the liquid crystal display device according to the one aspect, as described above, by switching between field sequential driving and driving for displaying a monochrome image on the liquid crystal panel, for example, a monochrome image is displayed on the liquid crystal panel. In the case of display, in field sequential driving, one of a plurality of light sources emits a monochrome image by emitting light for a period that is a fraction of the number of light sources in one field period (time of one field / number of light sources: 1 subfield). In the case where a monochrome image is displayed on the liquid crystal panel by causing at least one of the plurality of light sources to emit light, the light source can continuously emit light for one field. It can suppress that the image displayed on a panel becomes dark. In addition, by configuring the field sequential drive and the drive for displaying a monochrome image on the liquid crystal panel based on the brightness around the device, for example, when displaying a dark image at night on the liquid crystal panel, By using a drive that displays a monochrome image on the liquid crystal panel, it is possible to suppress the darkening of the image compared to the case of displaying using the field sequential drive, and thus the brightness of the light source can be reduced. And dark images at night can be clearly displayed with lower power consumption.

  In the liquid crystal display device according to the one aspect, preferably, when the brightness around the device is equal to or higher than the predetermined brightness, field sequential driving is used, and when the brightness around the device is less than the predetermined brightness. Is configured to use driving for displaying a monochrome image on the liquid crystal panel. With this configuration, for example, when a dark image at night is displayed on a liquid crystal panel, a dark image at night can be easily and clearly displayed with lower power consumption by using a drive for displaying a monochrome image on the liquid crystal panel. Can be displayed.

  In the liquid crystal display device according to the above aspect, preferably, when driving for displaying a monochrome image on the liquid crystal panel is used, a monochrome gradation image with varying shading is displayed on the liquid crystal panel. It is configured. If comprised in this way, unlike the case where an image is displayed by binary display, a clear image can be displayed.

  In the liquid crystal display device according to the above aspect, preferably, in the field sequential drive, a plurality of light sources are sequentially caused to emit light once in a period of one field, whereby images corresponding to each of the plurality of light sources are liquid crystal. In the driving for sequentially displaying on the panel and displaying the monochrome image on the liquid crystal panel, at least one of the plurality of light sources is continuously emitted within one field period. According to this configuration, in the driving for displaying a monochrome image on the liquid crystal panel, the light source can be continuously emitted within the period of one field, so that the image becomes darker than in the field sequential driving. Can be suppressed.

  In the liquid crystal display device according to the above aspect, preferably, when driving for displaying a monochrome image on the liquid crystal panel is used, the color of the monochrome image displayed on the liquid crystal panel among the plurality of light sources is different. By repeating the period in which the color light source is emitted and the period in which the monochrome image is displayed at a predetermined cycle, the auxiliary information is displayed during the period in which the light source having a color different from the color of the monochrome image displayed on the liquid crystal panel is emitted. It is configured to be displayed on the panel. With this configuration, for example, a dark image at night can be displayed as a monochrome image on the liquid crystal panel, and auxiliary information can be displayed in a color different from the color of the monochrome image and superimposed on the dark image at night. it can.

  The liquid crystal display device according to the above aspect preferably further includes a sensor for detecting the presence of an obstacle, and warning information indicating the presence of the obstacle detected by the sensor is displayed on the liquid crystal panel as auxiliary information. It is comprised so that. With this configuration, for example, a dark image at night is displayed on the liquid crystal panel as a monochrome image, and the presence of an obstacle that is difficult to recognize by the observer's eyes is displayed with a warning of a color different from the color of the monochrome image. It can be displayed over a dark image at night.

  In this case, preferably, the warning indicating the presence of the obstacle is configured to be displayed as a frame surrounding the obstacle detected by the sensor. If comprised in this way, the observer can recognize a warning indicating the presence of an obstacle easily.

  In the liquid crystal display device in which the auxiliary information is displayed on the liquid crystal panel, the period during which the light source emits light is preferably shorter than the monochrome image display period. With this configuration, the time for displaying the warning indicating the presence of the obstacle is shorter than the time for displaying the monochrome image, so the presence of the obstacle so that it blinks on the monochrome image. Can indicate a warning.

  The liquid crystal display device according to the above aspect preferably further comprises a sensor for detecting the presence of an obstacle, and when the presence of the obstacle is detected by the sensor regardless of the brightness around the device, It is configured to switch from field sequential driving to driving to display a monochrome image on the liquid crystal panel regardless of the brightness of the image. With this configuration, even when the observer overlooks the presence of an obstacle when the brightness around the device exceeds a predetermined level, a warning indicating the presence of the obstacle detected by the sensor is displayed on the liquid crystal panel. By doing so, the observer can recognize the presence of the obstacle.

  In the liquid crystal display device according to the above aspect, it is preferable that the plurality of light sources include at least two light sources among red, green, and blue light sources. If comprised in this way, a several color can be displayed by additive color mixture.

  In the liquid crystal display device according to the first aspect, preferably, when field sequential driving is used, driving information for displaying automobile navigation information in a plurality of colors on the liquid crystal panel and displaying a monochrome image on the liquid crystal panel is provided. When is used, the liquid crystal panel is configured to display an image in which a dark image at night is visualized. With this configuration, by using the field sequential drive, it is possible to easily display the navigation information of a car consisting of a relatively bright image in a plurality of colors and to drive the liquid crystal panel to display a monochrome image. By using the light source, the brightness of the light source can be reduced, so that images in a specific direction around the vehicle such as the front, rear, left and right sides of the vehicle (particularly, dark images at night composed of relatively dark images are infrared rays). Can be clearly displayed with lower power consumption.

  The liquid crystal display device according to the above aspect preferably further includes a mirror part provided on the opposite side of the light source of the liquid crystal panel, and transmits the light emitted from the light source that is transmitted through the liquid crystal panel and reflected by the mirror part. It is configured. If comprised in this way, the head-up display system which displays the image displayed on a liquid crystal panel on the glass part which consists of windshields, for example can be comprised.

1 is a cross-sectional view of a head-up display system according to an embodiment of the present invention. It is a figure for demonstrating the field sequential drive of the head-up display system by one Embodiment of this invention. It is a figure for demonstrating the field sequential drive of the head-up display system by one Embodiment of this invention. It is a top view of the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a figure for demonstrating the drive which displays a monochrome image on the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a figure for demonstrating the drive which displays a monochrome image on the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a top view of the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a top view of the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a figure for demonstrating the drive which displays the warning which shows the presence of an obstruction on the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a figure for demonstrating the drive which displays the warning which shows the presence of an obstruction on the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a top view of the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a top view of the liquid crystal panel of the head-up display system by one Embodiment of this invention. It is a figure for demonstrating the head-up display system by the 1st modification of one Embodiment of this invention. It is a figure for demonstrating the head-up display system by the 2nd modification of one Embodiment of this invention.

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

  With reference to FIG. 1, the structure of the head-up display system 100 by one Embodiment of this invention is demonstrated. In the present embodiment, a case where the present invention is applied to a head-up display system 100 which is an example of a liquid crystal display device will be described.

  As shown in FIG. 1, a head-up display system 100 according to an embodiment of the present invention is mounted, for example, in an automobile, and the head-up display unit 1 and light (image) emitted from the head-up display unit 1 The vehicle windshield 2 is displayed. The windshield 2 is an example of the “glass portion” in the present invention.

  Here, in the present embodiment, the head-up display unit 1 includes a housing 10, a concave mirror 11, and a liquid crystal display device unit 12. In addition, the liquid crystal display device unit 12 includes a backlight 13 and a liquid crystal panel 14. In the present embodiment, the backlight 13 includes an LED 13a that emits red (R) light, an LED 13b that emits green (G) light, and an LED 13c that emits blue (B) light. ing. The concave mirror 11 is an example of the “mirror part” in the present invention. The LEDs 13a, 13b, and 13c are examples of the “light source” in the present invention. The backlight 13, the liquid crystal panel 14, and the concave mirror 11 are generally arranged on a straight line parallel to the light emission direction of the light emitted from the backlight 13 (the arrangement position of the backlight is also linear, but the side surface The windshield 2 is arranged in the reflection direction of the light emitted from the backlight 13 and reflected by the concave mirror 11. The backlight 13 and the concave mirror 11 are disposed so as to face each other with the liquid crystal panel 14 interposed therebetween. In addition, the housing 10 is provided with an opening 10 a so that light is emitted from the head-up display unit 1.

  In addition, the head-up display unit 1 detects the brightness of the surroundings of the vehicle, such as a camera 15 for photographing the scenery around the vehicle, such as the front, rear, left and right sides of the vehicle, and outputs detection information. Brightness detection sensor 16 and obstacles (for example, living bodies such as people and animals, falling rocks, fallen trees, etc.) present on the road in the traveling direction, and the direction of travel of the vehicle from the steering angle and the vehicle speed of the steering Obstacle detection sensor 17 for outputting warning information when there is a risk of contact with an obstacle, and outputting road traffic information such as navigation information such as car position information and road information and traffic jam information Road information display device 18 for driving, vehicle information such as vehicle running speed, engine rotation speed and water temperature, warning information such as water temperature / oil temperature abnormality, refueling and forgetting to turn off lights Is connected vehicle information display device 19 because it, each of these information is the control circuit 20, it is processed / control, is output as display information on the liquid crystal display device section 12. The control circuit 20 outputs the warning information of the obstacle detection sensor 17, the road traffic information from the road information device 18, and the warning information from the vehicle information display device 19 to the liquid crystal display device section 12 as auxiliary information for the driver. The obstacle detection sensor 17 is an example of the “sensor” in the present invention. In addition, the liquid crystal display device unit 12 is configured to be controlled based on information output from the brightness detection sensor 16 and the obstacle detection sensor 17. Further, by using, for example, an infrared camera as the camera 15, it is possible to visualize a dark image at night which is difficult to capture with visible light as a monochrome image captured with infrared rays. The obstacle detection sensor 17 includes, for example, an infrared sensor that detects a heat source of a living body and an ultrasonic sensor that detects a front obstacle. The control circuit 20 may be provided on the substrate of the liquid crystal display device unit 12 or may be provided on a separate substrate.

  Next, with reference to FIGS. 1-12, operation | movement of the head-up display system 100 by one Embodiment of this invention is demonstrated.

  First, the brightness around the automobile is detected by the brightness detection sensor 16 shown in FIG. Here, in this embodiment, when the surrounding brightness is equal to or higher than a predetermined brightness (for example, daytime), the liquid crystal display device 12 is subjected to field sequential driving. In the field sequential drive, as shown in FIG. 2, a red image writing period and a red display period (one subfield) are displayed during one image display period (one field), and a green image writing process is performed. A green display period (1 subfield) and a blue image writing and blue display period (1 subfield) are included. Each pixel 14a is configured to display 4 gradations by 2 bits (0, 1, 2, 3 shown in FIG. 2). In field sequential driving, the liquid crystal panel 14 is driven at a frequency of 60 Hz, for example. That is, 60 images are sequentially displayed per second. Then, a red (green, blue) color image writing and red (green, blue) color display period (one subfield) is driven at 180 Hz.

Specifically, after a red image signal is written to a plurality of pixels 14a provided on the liquid crystal panel 14 (red writing), the red LED 13a emits light. As a result, a red image is displayed on the liquid crystal panel 14 and a red image displayed on the liquid crystal panel 14 is displayed on the windshield 2 via the concave mirror 11. Next, after a green image signal is written to the plurality of pixels 14a (green writing), the green LED 13b emits light. As a result, a green image is displayed on the liquid crystal panel 14, and a green image displayed on the liquid crystal panel 14 is displayed on the windshield 2 through the concave mirror 11. Then, after a blue image signal is written to the plurality of pixels 14a (blue writing), the blue LED 13c emits light. As a result, a blue image is displayed on the liquid crystal panel 14 and a blue image displayed on the liquid crystal panel 14 is displayed on the windshield 2 through the concave mirror 11. As a result, the observer (driver) recognizes the color created by the additive color mixture of red, green, blue, or red-green-blue, as shown in FIG. The number of gradations is represented by (2 ⁿ ) ^k (n: number of bits, k: number of light source colors), and in the present embodiment, 64 ((2 ² ) ³ ) colors are displayed. Is possible.

  In the present embodiment, road traffic information, vehicle information, position information, and the like are displayed as the display of the liquid crystal panel 14 (windshield 2) by field sequential driving. For example, as shown in FIG. 4, an arrow 21 indicating a traveling direction for car navigation and a mark 22 indicating a road are displayed by a mixed color (yellow) of red and green, and a dangerous object (for example, in front of a car) The warning 23 indicating the car in front of the vehicle is displayed in red. The vehicle speed 24 is displayed in green.

  Next, in this embodiment, when the surrounding brightness detected by the brightness detection sensor 16 illustrated in FIG. 1 is less than a predetermined brightness (for example, at night), the liquid crystal display device unit 12 is connected to the liquid crystal panel 14. Driving to display a monochrome image is performed. That is, in the present embodiment, the driving of the liquid crystal display device 12 is switched based on the brightness around the automobile. In driving for displaying a monochrome image on the liquid crystal panel 14, as shown in FIG. 5, the red LED 13a, the green LED 13b, and the blue LED 13c are continuously or intermittently simultaneously for one field period (three subfield periods). Is emitted. Thereby, as shown in FIG. 6, the liquid crystal panel 14 displays a black and white image in a mixed color of red, green and blue. When displaying a monochrome (monochrome) image by field sequential driving, each of the red LED 13a, the green LED 13b, and the blue LED 13c emits light only for one subfield period, so the red LED 13a and the green LED 13b. And the image displayed on the liquid crystal panel 14 becomes dark compared with the drive in which the blue LED 13c emits light continuously.

Similarly to the field sequential driving, each pixel 14a is configured to display 4 gradations (0, 1, 2, 3 shown in FIG. 5) using 2 bits. The number of gradations is represented by _2n−1 C ₁ × m + 1 (n: number of bits, m: number of subfields, C: combination), and in this embodiment, 10 (= ₃ C ₁ × 3 + 1). Can be displayed. Specifically, as shown in FIG. 5, in each subfield, the gradation of the pixel 14 a is adjusted to four levels of 0, 1, 2, and 3, and the observer can calculate the total of the three subfields. As shown in FIG. 6, the gradation is recognized as 0 to 9 gradations.

  In the present embodiment, in the driving for displaying a monochrome image on the liquid crystal panel 14, night vision (night image) is displayed as the display of the liquid crystal panel 14 (front glass 2). For example, as shown in FIG. 7, an image in front of the automobile photographed by the camera 15 (see FIG. 1) is displayed on the liquid crystal panel 14 (windshield 2).

  In the present embodiment, as shown in FIG. 8, when an obstacle in front of the automobile (for example, a pedestrian 25) is detected by the obstacle detection sensor 17, the liquid crystal panel 14 (the windshield 2) In addition to the image in front of, a warning (frame 26 surrounding the obstacle) indicating the presence of the obstacle is displayed.

  Specifically, when an obstacle is detected in front of the automobile, as shown in FIG. 9, a display (see FIG. 11) showing a frame 26 surrounding the red obstacle on the liquid crystal panel 14, The driving for displaying an image in front of the automobile (see FIG. 12) by black and white gradation display is alternately switched. As a result, the observer (driver) recognizes an image (see FIG. 8) in which both the image ahead of the car and the frame 26 surrounding the obstacle are displayed. It should be noted that the display showing the frame 26 surrounding the red obstacle is shorter than the time during which the front image of the black and white automobile is displayed. An R subfield is added to normal field sequential driving (3 subfields in this example). This four-subfield state is continued for a certain period (0.1 to 3 seconds) and then returned to the normal field sequential drive (3 subfields). It is recognized that the frame 26 surrounding the object blinks.

  In the present embodiment, the warning indicating the presence of an obstacle (the frame 26 surrounding the obstacle) is displayed on the liquid crystal panel 14 because a monochrome image is displayed on the liquid crystal panel 14 (a nighttime image is displayed). Not only in the case of driving, but also when the obstacle detection sensor 17 detects an obstacle in front of the vehicle during the field sequential driving in which navigation information is displayed, the liquid crystal panel 14 is also obstructed. A warning indicating the presence of an object (a frame 26 surrounding the obstacle) may be displayed. In this embodiment, warning information (warning indicating the presence of an obstacle) of the obstacle detection sensor 17 is displayed as auxiliary information, but in addition to this, road traffic information from the road information device 18 and Auxiliary information such as warning information from the vehicle information display device 19 may be displayed.

  In the present embodiment, as described above, when a monochrome image is displayed on the liquid crystal panel 14 by switching between the field sequential drive and the drive for displaying the monochrome (monochrome) on the liquid crystal panel 14, In the field sequential drive, one of the three LEDs 13a to 13c displays a monochrome image by emitting light for a period of time after the response time of the liquid crystal in one-third period (one subfield) of one field period. On the other hand, in the driving for displaying a monochrome image on the liquid crystal panel 14, the three LEDs 13 a to 13 c can emit light continuously for one field. (Dark image) becomes brighter. Thereby, the power of the backlight can be reduced.

  In the present embodiment, as described above, when the brightness around the head-up display system 100 (automobile) is equal to or higher than the predetermined brightness, the color field sequential drive is used, and the brightness around the head-up display system 100 is used. If the brightness is less than a predetermined brightness, the liquid crystal panel 14 is configured to use a drive for displaying a monochrome image (normal intermittent lighting field sequential or continuous lighting field sequential).

  Further, in the present embodiment, as described above, when driving for displaying a monochrome image on the liquid crystal panel 14 is used, a monochrome gradation image with varying shading is displayed on the liquid crystal panel 14. With this configuration, unlike the case where an image is displayed by binary display, the visibility of the observer's image is improved.

  In the present embodiment, as described above, in color field sequential driving, the LEDs 13a to 13c are caused to emit light one after another intermittently within a period of one field, thereby displaying red, green and blue images on the liquid crystal panel. In contrast to the sequential display on the LCD 14, in the driving for displaying a monochrome image on the liquid crystal panel 14, the three LEDs 13 a to 13 c are configured to emit light continuously within a period of one field. A lamp with low emission peak brightness can be used.

  Further, in the present embodiment, as described above, when driving for displaying a monochrome image (black and white) on the liquid crystal panel 14 is used, the LED 13a (red) is set for a predetermined period (0.1 seconds to 3 seconds). ) In addition to the normal field sequential drive (in this example: 3 subfields), by emitting light, a warning indicating the presence of an obstacle detected by the obstacle detection sensor 17 is displayed on the liquid crystal panel 14, thereby A dark image can be displayed on the liquid crystal panel 14, and a warning indicating the presence of an obstacle that is difficult for the observer (driver) to recognize can be displayed over the monochrome image.

  Further, in the present embodiment, as described above, the warning indicating the presence of the obstacle is displayed as the frame 26 surrounding the obstacle detected by the obstacle detection sensor 17, so that the presence of the obstacle can be easily detected. The warning shown can be recognized by the observer.

  In the present embodiment, as described above, a predetermined period (0.1 seconds to 3 seconds or less) during which the LED 13a (red) emits light is from a period during which the LEDs 13a to 13c sequentially emit light in normal monochrome field sequential driving. Since the time for displaying the frame 26 surrounding the obstacle is shorter than the time for displaying the monochrome image, the frame 26 surrounding the obstacle so as to blink on the monochrome image. Can be shown.

  Further, in the present embodiment, as described above, when the presence of an obstacle is detected by the obstacle detection sensor 17 separately from the switching based on the brightness around the head-up display system 100 (automobile), the color field is displayed. By switching from sequential driving to driving to display a monochrome field sequential image on the liquid crystal panel 14, when the brightness around the head-up display system 100 (automobile) exceeds a predetermined level, the observer can Even if the presence of an obstacle is overlooked, a warning indicating the presence of the obstacle detected by the obstacle detection sensor 17 is displayed on the liquid crystal panel 14 so that the observer can recognize the presence of the obstacle.

  Further, in the present embodiment, as described above, the vehicle navigation information is displayed in a plurality of colors on the liquid crystal panel 14 by the color field sequential drive in the daytime, and the dark night image is visualized at night and the warning frame. Can be displayed.

  In the present embodiment, as described above, the concave mirror 11 provided on the opposite side of the backlight 13 of the liquid crystal panel 14 and the emitted light of the LEDs 13a to 13c that are transmitted through the liquid crystal panel 14 and reflected by the concave mirror 11 are displayed. For the purpose of adjusting the projection distance of the panel image in order to optimize the viewing distance of the driver, and the image displayed on the liquid crystal panel 14 is displayed on the windshield 2. The head-up display system 100 to be displayed can be configured.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, an example in which three LEDs of red, green, and blue emit light intermittently at the time of driving to display a monochrome image on the liquid crystal panel has been described. However, the present invention is not limited to this. As shown in FIG. 13, in driving for displaying a monochrome image on the liquid crystal panel, the two LEDs of green and blue may be caused to emit light continuously at the same time. Thereby, the observer recognizes a night image of a mixed color of green and blue together with a red warning frame. Further, as shown in FIG. 14, in driving for displaying a monochrome image on the liquid crystal panel, one LED such as green may be continuously emitted. Thus, the observer recognizes the green night image together with the red warning frame.

  Moreover, in the said embodiment, although the example using three LED of red, green, and blue was shown, this invention is not restricted to this, One LED of red, green, and blue, and its complementary color LED And may be used. Thereby, white LED can be displayed on the display panel by lighting both the LED of one color of red, green and blue and the LED of its complementary color.

  In the above-described embodiment, when field sequential driving is used, navigation information is displayed on the liquid crystal panel, and when driving a monochrome image on the liquid crystal panel, a dark image at night is displayed on the liquid crystal panel. However, the present invention is not limited to this, and navigation information or a dark image other than a dark image at night may be displayed on the display panel.

2 Windshield (glass part)
11 Concave mirror (mirror part)
13a, 13b, 13c LED (light source)
14 LCD panel 17 Obstacle detection sensor (sensor)
26 frames

Claims (12)

Multiple light sources;
A display unit provided to face the plurality of light sources,
Field sequential driving for displaying a plurality of colors by sequentially displaying images of colors corresponding to each of the plurality of light sources on the display unit by sequentially emitting the plurality of light sources; and among the plurality of light sources Are configured to switch between driving to display a monochrome image on the display unit by simultaneously emitting one or more light sources.
The field sequential drive and the drive for displaying a monochrome image on the display unit are configured to be switched based on the brightness around the device ,
If the brightness of the peripheral front Symbol device is equal to or higher than the predetermined brightness, the field sequential driving is used, when the brightness of surrounding the device is less than the predetermined brightness, monochrome on the display unit driving for displaying an image is configured to be used, the display apparatus. When driving for displaying the image of monochrome on the display unit is used, the display unit is configured as tone monochrome image of varying shades are displayed, according to claim 1 Viewing device. In the field sequential drive, by sequentially emitting the plurality of light sources one by one within a period of one field, images of colors corresponding to the plurality of light sources are sequentially displayed on the display unit ,
Wherein the driving for displaying the image of the monochrome display portion is configured to at least one of the plurality of light sources within a period of one field so as to continuously emit light, according to claim 1 or 2 Viewing equipment. Multiple light sources;
A display unit provided to face the plurality of light sources,
Field sequential driving for displaying a plurality of colors by sequentially displaying images of colors corresponding to each of the plurality of light sources on the display unit by sequentially emitting the plurality of light sources; and among the plurality of light sources Are configured to switch between driving to display a monochrome image on the display unit by simultaneously emitting one or more light sources.
The field sequential drive and the drive for displaying a monochrome image on the display unit are configured to be switched based on the brightness around the device ,
When driving for displaying the monochrome image prior Symbol display unit is used, the a period for emitting different colors of light sources and colors of the monochrome images to be displayed on the display unit of the plurality of light sources By repeating a period for displaying a monochrome image at a predetermined cycle, auxiliary information is displayed on the display unit during a period in which a light source having a color different from the color of the monochrome image displayed on the display unit is emitted. It is configured, the display apparatus. A sensor for detecting obstacles;
Wherein as auxiliary information, warning information indicating the presence of a detected obstacle by said sensor is configured to be displayed on the display unit, the display device according to claim 4. The warning indicating the presence of obstacles, the is configured to be displayed as a frame surrounding the detected obstacle by the sensor, the display device according to claim 5. Period for emitting the light source, the shorter than the monochrome image display period, the display device according to any one of claims 4-6. A sensor for detecting the presence of an obstacle,
Regardless of the brightness around the device, when the presence of an obstacle is detected by the sensor, the field sequential drive is switched to a drive for displaying a monochrome image on the display unit. Viewing apparatus according to any one of clauses 1-4. Wherein the plurality of light sources, red, consists of at least two or more light sources of the green and blue light sources, the display device according to any one of claims 1-8. When the field sequential drive is used, the display unit displays vehicle navigation information in a plurality of colors.
When driving for displaying the image of the monochrome is used on the display unit, the display unit, the image in a specific direction around the vehicle is configured to be displayed, any one of claims 1-9 Viewing apparatus according to item 1. A mirror unit provided on the opposite side of the display unit from the light source;
The display unit passes through and is configured to output the output light of the light source is reflected by the mirror portion, the display device according to any one of claims 1-10. A head-up display system comprising the display device according to claim 1.

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