JPH0687043U - Vehicle display - Google Patents

Abstract

(57) [Summary] [Structure] The light emitted from the light source unit 1 provided below the windshield 4 passes through the lens system 2 which is a collimator to transmit the information to be displayed, which is to be displayed. The light-emission display means 8 that emits the light changes the image formation position of the display virtual image 6 by moving back and forth in the direction of the light emitted toward the combiner 5 according to the vehicle speed. [Effect] Since the displayed virtual image and the focus position of the driver's eyes are the same at any vehicle speed, the condition outside the vehicle and the displayed contents can always be recognized at the same time. A highly reliable vehicle display device can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicular display device, and more particularly, to a vehicular display device called a head-up display (hereinafter referred to as HUD) that includes a combiner on a windshield to display a virtual display image toward a driver. .

[0002]

[Prior art]

 HUD has recently been used as a method of displaying information to a driver in an automobile or the like. This is because the optical information emitted from the light emitting display means such as a liquid crystal display device is projected on a combiner consisting of a hologram or a half mirror incorporated in the windshield of an automobile, etc. The information can be read without moving it.

FIG. 4 is a conceptual diagram showing an example of a conventional HUD. Light including information to be displayed, which is emitted from the light source unit 1 and passed through the lens system 2 and the display body 3 made of a transmissive liquid crystal display element, is irradiated to the combiner 5 provided on the windshield 4 of the vehicle body and reflected. , Is diffracted and is visually recognized by the observer 7 at the observation position. At this time, the image forming position of the display virtual image is determined by the distance between the combiner (mirror) 5 and the light emitting display means 8 in the case of the mirror type HUD, and in the case of the hologram type HUD, the conditions for producing the hologram and the combiner. The distance between the (hologram) 5 and the light emission display means 8 determines the distance, and in the conventional HUD, the image formation distance of the display virtual image is constant. Further, in the conventional HUD, the display color such as the speed display is always the same color.

[0004]

[Problems to be solved by the device]

 When driving a vehicle, the driver changes the focal length of his eyes depending on the vehicle speed. The higher the speed, the farther the distance, and the lower the speed, the closer the eyes are focused. As described above, in the conventional HUD, since the image formation distance of the display virtual image is constant, a difference between the focus position of the eyes and the display virtual image position occurs due to the change of the vehicle speed, and at the same time, the display virtual image and the situation outside the vehicle are different. Had the drawback of being difficult to recognize. Also, since the display color of the speed display etc. was constant, no warning was given visually that the speed was too high. An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a vehicle display device that has not been known in the past.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above-mentioned problems, and a light emitting display means for generating light including information to be displayed and a combiner arranged to receive the light and diffract toward an observer. In a vehicle display device comprising at least a display virtual image of the light emitting display means for an observer, the light emitting display means changes the image formation position of the display virtual image according to a vehicle speed, A display device for a vehicle, which is movable in a direction of light emitted toward a combiner.

[0006]

[Action]

 According to the HUD of the present invention, it is possible to move the light emitting display means so as to move away from the combiner as the vehicle speed increases, and to move the light emitting display means closer to the combiner as the vehicle speed decreases. As the vehicle speed increases, the image formation position of the display virtual image becomes farther from the driver, and as the vehicle speed decreases, the image formation position of the display virtual image becomes closer to the driver.

In this way, since the virtual display image and the focus position of the driver's eyes are the same at any vehicle speed, the situation outside the vehicle and the displayed contents can always be recognized at the same time, and tiredness due to the focus shift of the eyes is small. Increase safety. In addition, since the warning is given visually, the driver and passengers will not feel uncomfortable compared to the conventional sound warning.

[0008]

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing an example of a HUD in the present invention. A light emitting display means 8 is provided below the windshield 4, and the light emitting display means 8 includes a transmissive liquid crystal display element through which light emitted from the light source section 1 passes through a lens system 2 which is a collimator. The information to be displayed which has passed through the indicator 3 is emitted as light. This light is applied to the combiner 5 provided on the windshield 4 of the vehicle body, reflected, diffracted, and visually recognized by an observer 7 such as a driver.

At this time, the image formation position of the display virtual image 6 is changed by moving the light emitting display means 8 back and forth in the direction of the light emitted toward the combiner 5 according to the vehicle speed. Specifically, when the vehicle speed becomes faster, the light emitting display means 8 is moved away from the combiner 5 and the image forming position of the display virtual image is moved away, and when the vehicle speed becomes slower, the light emitting display means 8 is moved closer to the combiner 5 to form the display virtual image. Bring the distance closer.

Table 1 shows the distance between the light emitting display means and the combiner and the distance between the display virtual image and the combiner (that is, the image formation position of the display virtual image) when the hologram is used as the combiner.

[0011]

[Table 1]

As described above, by bringing the light emitting display means closer to the combiner, the image forming position of the display virtual image also comes closer, and conversely, by making the light emitting display means farther from the combiner, the image forming position of the display virtual image can be made farther away. As a method for producing such a hologram, for example, as shown in FIG. 2, the light sources 13 and 13 are provided at positions separated by 400 (mm) and 800 (mm) from the hologram photosensitive material 14, respectively. Spherical wave exposure is performed from both surface sides of the photosensitive material 14 at desired incident angles to form the above hologram.

Of course, the present invention is not limited to the configuration based on the drawings described above. For example, a half mirror can be used as the combiner. In this case, the half mirror is a simple mirror. Therefore, the distance between the light emitting display means and the combiner is equal to the distance between the image forming position of the display virtual image and the combiner, and if the distance between the light emitting display means and the combiner is changed, the image forming position of the display virtual image is the same as that of the combiner. The distance also changes. At this time, the size of the display virtual image also changes, but if it is desired to keep the size of the display virtual image constant regardless of the position of the image formation of the display virtual image, the size of the display virtual image of the liquid crystal display element is changed according to the position. You can change it.

The light emitting display means in the present invention has a function of emitting light to display, and a hot cathode tube (HCT), a cold cathode tube, a cold cathode tube, and a display body including a so-called light receiving display element such as a liquid crystal display element. It suffices to irradiate the light emitted from a light source section including a fluorescent display tube (VF), a halogen lamp, an LED, or the like, or it may have these functions together.

The information to be displayed in the present invention is appropriately selected according to its display application, and examples thereof include a speedometer of a vehicle, a tachometer, and various warning lamps. The observer is mainly the driver, but can also include other passengers and other passengers, and all of them.

FIG. 3 shows another example of the HUD according to the present invention. A light emitting display means 8 is provided below the windshield 4, and the light emitting display means 8 includes the light source 1 and a collimator lens. 2 and a lens 9 and a light-emitting display section 18 including a display body 3 made of a transmissive liquid crystal display element. The information to be displayed, which has passed through the display body 3 formed of elements, is emitted as light toward the combiner 5 through the lens 9.

At this time, the image forming position of the display virtual image 6 is changed by moving the lens 9 back and forth in the direction of the light emitted toward the combiner 5 according to the vehicle speed. Specifically, when the vehicle speed increases, the lens 9 is moved away from the combiner 5 and the image forming position of the display virtual image is moved away, and when the vehicle speed is decreased, the lens 9 is moved closer to the combiner 5 and the image forming distance of the display virtual image is decreased.

As a method of moving the light emitting display means according to the vehicle speed, for example, a speed sensing sensor is attached to a part of the vehicle body, and this sensor and the moving mechanism of the light emitting display means (for example, a motor) are interlocked. Can be achieved by Furthermore, by linking this sensor with the display unit to change the size of the display virtual image displayed, or linking this sensor with the light source unit to change the displayed color, it is possible to provide more advanced information. Can be realized.

For example, when the safety reference speed is set to 100 km / h, when the vehicle speed is 99 km / h or less, the speed display is displayed in green, and when the vehicle speed exceeds 100 km / h, a warning color such as red is displayed to observe. Information can be provided to the person in a form that includes the danger, and the danger can be sufficiently communicated to the observer without the discomfort of transmitting the danger information that was conventionally performed by a warning person. You can If the light source section is used to change the color, a combiner that reflects and diffracts both green and red is used.If a half mirror is used as the combiner, visible light total reflection or green light is used. It is only necessary to use one that selectively reflects only red, and when using a hologram, multiple exposure with green and red, or a combination of two holograms exposed with green and red respectively. Should be used.

[0020]

[Effect of device]

 According to the present invention, it is possible to move the light emitting display means so as to move away from the combiner as the vehicle speed increases, and to move the light emitting display means closer to the combiner as the vehicle speed becomes slower. The image formation position of the display virtual image becomes farther from the driver as the vehicle speed increases, and the image formation position of the display virtual image becomes closer to the driver as the vehicle speed decreases.

In this way, since the displayed virtual image and the focus position of the driver's eyes are the same at any vehicle speed, the condition outside the vehicle and the displayed contents can always be recognized at the same time, and tiredness due to the focus shift of the eyes is also avoided. It is possible to obtain a vehicle display device that is less in number and highly safe. Further, according to the present invention, since information such as a warning is visually provided to the driver or the like, when the speed is too high, the driver and the passengers are more likely than the conventional sound warning. No discomfort.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an example of a HUD in the present invention.

FIG. 2 is a conceptual diagram showing a method of creating a hologram.

FIG. 3 is a conceptual diagram showing an example of a HUD in the present invention.

FIG. 4 is a conceptual diagram showing an example of a conventional HUD.

[Explanation of symbols]

 1: Light source part 2: Collimator lens 3: Display body 4: Windshield 5: Combiner 6: Virtual image of display 7: Observer 8: Luminous display means 9: Lens 13: Light source 14: Holographic photosensitive material

Claims (5)

[Scope of utility model registration request] 1. A display virtual image of the light emitting display means, comprising at least a light emitting display means for generating light including information to be displayed and a combiner arranged to receive the light and diffract toward an observer. In the vehicular display device that is made visible to the observer, the light emitting display means changes the image formation position of the display virtual image according to the vehicle speed, with respect to the direction of the light emitted toward the combiner. A display device for a vehicle, which is movable. 2. The light emitting display means has at least a light source section and a display body, and the entire light emitting display means is movable in the direction of the light emitted toward the combiner. 1 vehicle display device. 3. The light emitting display means includes a light emitting display section having at least a light source section and a display body, and a lens arranged between the light emitting display section and the combiner, the lens facing the combiner. The display device for a vehicle according to claim 1, wherein the display device for a vehicle is movable in the direction of the light that is emitted. 4. The display device for a vehicle according to claim 2, wherein the display has a display size that changes in accordance with the vehicle speed. 5. The vehicle display device according to claim 1, wherein the display color of the light emitting display means changes according to a vehicle speed.