JP2005148543A - Flat video system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat video system that automatically avoids direct reflection by a display surface of a flat video system to a driver. <P>SOLUTION: Provided is the flat video system which is equipped with a flat display displaying a picture, a display drive part varying the angle of installation of the flat display, an optical detection part detecting light from a specified direction, and a drive control part controlling the display drive part by detecting the light by the optical detection part, and can automatically avoid the reflection by detecting the light from the direction wherein the optical detection part provided on the display surface of the flat video system generates the reflection and drives the display drive part by the drive control part to change the angle of installation of the flat display. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a planar video apparatus mounted in a car navigation system or the like.

  The car navigation system is used in an environment where ambient brightness changes. When there is strong light outside the vehicle, such as outdoors in the clear sky or at night, the light that has been inserted into the vehicle is reflected from the display surface of the flat-screen video device and reflected directly to the user of the flat-screen video device. There are things to do. When this reflection occurs, the visibility of the flat image display device is significantly reduced.

  So far, methods have been proposed to control the contrast distribution of the display screen by adjusting the voltage applied to the liquid crystal cell of the liquid crystal display device and adjusting the viewing angle of the polarizing plate attached to the surface of the liquid crystal display device. (For example, refer to Patent Document 1). However, this method changes the contrast distribution of the liquid crystal display device, and the reflection is not eliminated.

If such a reflection occurs during traveling by the driver alone, the driver will reach out and change the inclination of the flat-screen image device. Since this action is dangerous during driving, a function for automatically avoiding light directly reflected from the display surface to the driver is required of the flat-screen image device.
Japanese Patent Laid-Open No. 2003-084681.

  It is an object of the present invention to provide a flat image display device that automatically avoids reflections that are generated by direct reflection from the display surface of the flat image display device.

  A flat image display device according to the present invention includes a flat display that displays an image, a display drive unit that changes an installation angle of the flat display, a light detection unit that detects light from a specific direction, A drive control unit that controls the display drive unit by detecting light, and when the light detection unit detects light from a specific direction, the drive control unit drives the display drive unit to install the flat display. To change. As a result, it is possible to provide a flat image display device that can detect light that is reflected directly from the display surface of the flat image display device and generates reflection, and can automatically avoid reflection.

  The display driving unit may vary an installation angle about at least one axis. By rotating about one axis and changing the installation angle of the flat image display device, it is possible to effectively change the light path with few operations. As a result, light from the direction that causes reflection by direct reflection from the display surface of the flat image device of the light detection unit to the driver is detected, and reflection is avoided by automatically changing the reflection angle. It is possible to provide a high-quality flat image device.

  The light detection unit is characterized in that an optical sensor is provided at the bottom of a cylinder whose inner surface is non-reflective. With such a structure, the light detected by the optical sensor can be made only from the direction of the central axis of the cylinder. As a result, it is possible to reliably detect only light from the direction in which reflection is generated directly from the display surface of the flat-screen image device and to generate a reflection. An apparatus can be provided.

  Another light detection unit according to the present invention includes an optical slit, and a plurality of optical sensors arranged in parallel in a direction orthogonal to the longitudinal direction of the slit on the back surface of the slit. By adopting such a structure, it is possible to simultaneously detect light from a plurality of directions that travels in a plane orthogonal to the longitudinal direction of the optical slit and enters the optical slit. As a result, it becomes possible to detect in detail the direction of light incident on the flat image display device with a single light slit, so that a fine display with respect to the reflection directly reflected from the display surface of the flat image display device to the driver. It is possible to provide a highly visible flat image display device that can control the drive unit.

  According to the present invention, by including a flat display, a light detection unit, a drive control unit, and a display drive unit, it is possible to automatically avoid light directly reflected from the display surface of the flat image display device to the driver. It is possible to provide a flat image device with high visibility.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a diagram showing a state viewed from above when a reflection occurs in the flat image device 10, and FIG. 2 is a diagram showing the flat image device 10 including the vehicle body installation unit 5 as viewed from the side. Is an example of an optical path when light that causes reflection on the display surface of the flat image device 10 is reflected. FIG. 4 shows an optical path when light that causes reflection on the display surface of the flat image device 10 is reflected. FIG. 5 is a schematic diagram in which light enters one example of the light detection unit 3, FIG. 6 is a schematic diagram in which light enters another example of the light detection unit 3, and FIG. It is the figure which looked at the other example of the imaging device from the side.

  FIG. 1 shows a state seen from above when reflection occurs in the flat image device 10. The flat image device 10 includes a flat display 1 that displays an image, a display driving unit 2 that changes an installation angle of the flat display 1, a light detection unit 3 that detects light from a specific direction, and a light detection unit 3. A drive control unit (not shown) that controls the display drive unit 2 by detecting light. The light detection unit 3 is disposed on the same surface as the flat display 1, the output terminal of the light detection unit 3 is connected to the input terminal of the drive control unit, and the output terminal of the drive control unit is connected to the display drive unit 2. . In FIG. 1, the incident light 51 enters the center of the flat display 1, and the reflected light 52 of the incident light 51 is reflected on the driver 6. Incident light 51 enters the flat display 1 and also enters the light detection unit 3. The light detection unit 3 detects light incident on the flat display 1 from a specific direction including the incident light 51, and the drive control unit determines whether the incident light 51 is particularly strong among the light detected by the light detection unit 3. Then, the installation angle of the flat display 1 is determined, and the display driving unit 2 changes the installation angle of the flat display 1 by driving from the drive control unit.

  The flat display 1 is arranged in a part of the flat image device 10 and displays an image including characters such as a map and road information. The flat display 1 may be a conventional display such as a liquid crystal display that can display an image including characters with a flat display surface. In addition to the liquid crystal, those usable for the flat display 1 include a cathode ray tube, a plasma display, an organic / inorganic electroluminescence display, a field emission display, and the like. Further, the surface of the flat display 1 may be processed to prevent reflection, such as an antireflection film, and reflection can be more effectively avoided by this processing.

  The light detection unit 3 is a part of the flat image display device 10 and is disposed on the same surface as the flat display 1 and detects only light incident on the flat display 1 from a specific direction. The light detection unit 3 can detect light incident from at least two different directions, and one of them can always detect light from the direction in which reflection occurs.

  The display driving unit 2 is arranged at the center of the bottom of the flat image display device 10 including the flat display 1 and the photodetector 3. As shown in FIG. 2, which is a plan view of the planar video device 10 viewed from the side, the planar video device 10 is connected to the vehicle body installation unit 5 installed on the vehicle body by the display driving unit 2. A part of the display driving unit 2 is fixed to the flat image device 10, and the other part of the display driving unit 2 is fixed to the vehicle body installation unit 5. A part of the display driving unit 2 fixed to the flat image device 10 and a part of the display driving unit 2 fixed to the vehicle body driving unit 5 rotate relatively. Thus, when the display driving unit 2 is driven, the angle of the flat image device 10 with respect to the vehicle body setting unit 5 changes, and the installation angle of the flat display 1 can be changed. The installation location of the display drive unit 2 may not be between the flat image device 10 and the vehicle body installation unit 5. For example, as shown in FIG. 7, if the vehicle body installation unit 5 is provided on the back surface of the flat display 1 and the display driving unit 2 is disposed in a part of the vehicle body installation unit 5, the flat display 10 can be removed even when mounted on the vehicle. Reflection can be automatically avoided.

  An example of driving of the display driving unit 2 will be described with reference to FIGS. FIG. 3 shows an example of an optical path when the incident light 51 that causes reflection on the surface of the flat display 1 shown in FIG. The flat display 1 is disposed at the left and right center of the surface displayed by the flat video device 10. 3-1 shows a state in which the incident light 51 is incident on the center of the flat display 1 and the reflected light 52 reflected therefrom is directly reflected on the driver 6. The installation angle of the flat display 1 at this time is set to zero. 3-2 shows that when the flat image display device 10 is rotated by an angle α from the normal 61 of the flat display 1 around the display drive unit 2, the incident light 53 is incident on the center of the flat display 1 and is incident from there. The state where the reflected light 54 of the light 53 is directly reflected on the driver 6 is shown. FIG. 5 shows an example of the light detection unit 3 shown in FIG. 1. The optical sensor 11 receives the incident light 51 shown in FIG. 3A, and the optical sensor 12 receives the incident light 53 shown in FIG. Can be detected. The drive control unit determines the installation angle of the display drive unit 2 as shown in FIG. 3-2 when the light sensor 11 detects strong light when the installation angle of the display drive unit 2 shown in FIG. When the light sensor 12 detects strong light when the installation angle of the display drive unit 2 is α, the display drive unit 2 is changed to the installation angle 0 as shown in FIG. By changing the installation angle of the display drive unit 2 in this way, it is possible to avoid the reflection on the display surface of the flat image device 10. Although only two installation angles are shown here, fine adjustment is possible if a variable installation angle of the display driving unit 2 and a light sensor of the light detection unit 3 are further provided. The visibility can be further improved in accordance with the characteristics of the flat display 1 such as the viewing angle.

  The display driving unit 2 can change the installation angle about at least one axis. The display driving unit 2 is rotatable with respect to one shaft, and the shaft portion is fixed to the vehicle body installation portion 5 and the movable portion is fixed to the flat image display device 10. When the drive control unit drives the display driving unit 2, the flat video device 10 rotates around the shaft portion of the vehicle body installation unit 5, and the installation angle of the flat display 1 can be changed. FIG. 4 is an example of a state when the flat image display device 10 shown in FIG. 1 is attached to the vehicle body. 4A, incident light 51 is incident on the center of the flat display 1 at θ with respect to the normal 61 of the flat display 1, and reflected light 52 of the incident light 51 from there is normal to the normal 61 of the flat display 1. It is reflected directly to the driver 6 at θ. 4B, incident light 51 from the same direction as in FIG. 4A is incident on the center of the flat display 1 rotated by an angle α with respect to the normal 61 around the display driving unit 2. The reflected light 55 of the incident light 51 is reflected. When the planar video device 10 is rotated by an angle α with respect to the normal 61 around the display drive unit 2, the incident light 51 is relative to the normal 62 of the rotated flat display 1 as shown in FIG. Therefore, the light enters from the angle θ-α. Therefore, the reflected light 55 when the angle of the display driving unit 2 is α is reflected in the direction of θ−α with respect to the normal line 62 of the flat display 1, and thus the reflection angle of the reflected light 55 with respect to the normal line 61. Becomes θ-2α. As a result, for example, by rotating the display driving unit 2 by 10 degrees, the optical path of the reflected light can be changed by 20 degrees compared to before the display driving unit 2 is rotated. It can be deviated from the driver 6. As a result, it is possible to provide the flat image device 10 capable of quickly and automatically avoiding the reflection that occurs from the display surface of the flat image device 10. The display drive part 2 should just be what can be rotated to a specific angle conventionally, such as a motor, for example. Note that the number of rotation axes is not limited to one, and the rotation axes may be rotated by a plurality of axes. By increasing the number of rotating shafts, not only direct reflection from the surface of the flat display 1 is avoided, but also a flat image device 10 with high visibility is provided in consideration of various characteristics such as the viewing angle of the flat display 1. You can also

  The light detection unit 3 will be further described. The light detection unit 3 is a part of the flat image display device 10 and is disposed on the same surface as the flat display 1, and an optical sensor is installed so that only light incident on the flat display 1 from a specific direction can be detected. . The optical sensor detects light incident from at least two different directions, and one of them can always detect light from the direction in which reflection occurs. Information on the light detected by each optical sensor is sent to the drive controller as it is. In addition, using a sensor capable of processing in the light detection part such as a artificial retina sensor, light from one direction among the light detected by each light sensor is particularly strong, and the light causes reflection. A signal may be sent to the drive control unit when it is from the direction. The optical sensor used in the light detection unit 3 may be a conventional one such as a photodiode such as a silicon photodiode, a photoelectric conducting element such as CdS, or a photoelectric tube. It is sufficient to install as many photosensors as there are directions to be detected. If an optical sensor capable of detecting the position, such as a position sensor, CCD, or MOS, is used, light incident from a plurality of directions can be detected by one sensor.

  FIG. 5 shows an example of the light detection unit 3 in which the optical sensors 11 and 12 are provided at the bottoms in the two cylinders whose inner surfaces are non-reflective. The light detection unit 3 shown in FIG. 5 shows a cross section of the light detection unit 3. The daylighting window is provided on the same surface as the flat display 1, and photosensors 11 and 12 are installed on the bottom thereof. By detecting only the light that enters from the daylighting window and reaches the bottom of the cylinder without being reflected in the cylinder, it is reflected on the flat display 1 when the installation angle of the display driving unit 2 is 0 or α. Incident light 51 and 53 to be generated can be detected. The optical sensors 11 and 12 to be installed may be conventional ones that can detect light. FIG. 5 shows an example of detecting light in two directions. However, cylindrical cavities in which the optical sensors 11 and 12 are installed are provided in the same number as the direction of the light to be detected, and light from different directions is detected. May be. The diameter of the cylinder provided in the light detection unit 3 may be any diameter that is sufficient to detect light. The diameter of the cylinder may be changed between the vicinity of the entrance and the bottom so that it is convenient to install the optical sensors 11 and 12. The inner surface of the cylinder may be a color that absorbs light, such as black. The inner surface of the cylinder may further enhance light absorption by using a material that absorbs light. When the daylighting window is covered with a resin such as a film having a small light transmission loss, it is possible to prevent a decrease in sensitivity of the optical sensor due to deposits such as dust. With such a structure, only light incident from a specific direction can be efficiently collected. As a result, it is possible to provide a highly visible flat image display device that can reliably detect only light from the direction directly reflected on the driver 6 by the flat display 1 and can automatically avoid reflection.

  An example of the light detection unit 3 in which the optical slit 7 is arranged on the same surface as the flat display 1 and a plurality of optical sensors are arranged in the direction orthogonal to the longitudinal direction of the optical slit 7 on the back surface of the optical slit 7 is shown in FIG. Shown in Of the light that has entered the optical slit 7, incident light from a direction in which reflection is generated in the flat display 1 is detected by the optical sensors 11 and 12 arranged on the back surface of the optical slit 7. The slit width of the optical slit 7 is such that the interference light at the optical slit 7 is sufficiently reduced in the light detected by the optical sensor. Moreover, the length of the optical slit 7 should just be a magnitude | size large enough to detect light. Further, the edge of the light slit 7 may have a color or a form that can prevent light from being scattered in order to prevent light scattered at the edge portion and entering the back surface of the light slit. The back surface of the optical slit 7 may be hollow, or a translucent material such as resin may be disposed between the optical sensors 11 and 12 and the optical slit 7 and integrated. By integrating, the strength against external impact can be increased. The inner surface of the back surface of the light slit 7 can improve the sensitivity of light detection from a specific direction by using a color that absorbs light such as black or a material that absorbs light. If the surface of the optical slit 7 is covered with a resin such as a film with little light transmission loss, it is possible to prevent the sensitivity of the optical sensors 11 and 12 from being reduced by an adhering substance such as dust. In FIG. 6, two photosensors are arranged on the back surface of the optical slit 7, but as many photosensors as the number of directions to be detected may be installed. Furthermore, light incident from a plurality of directions may be detected by one sensor using an optical sensor capable of detecting the position, such as a position sensor, CCD, or MOS. By configuring the light detection unit 3 in such a structure, it is possible to detect light from multiple directions with a single daylighting window. This makes it possible to detect in detail the direction of light incident on the flat image device 10 with one light slit 7, so that the reflection directly reflected on the driver 6 from the display surface of the flat image device 10 is prevented. In addition, it is possible to provide a highly visible flat image display device that can control minute display drive.

  The flat image display device of the present invention can be applied not only to a car navigation system, but also to an in-vehicle device using a display, and further to a display used in a stationary type.

It is a figure which shows the state which looked at the plane image apparatus 10 when a reflection generate | occur | produces from the top. It is the figure which looked at the plane image apparatus 10 and the vehicle body installation part 5 which were shown in FIG. 1 from the side. It is a figure which shows an example of a state when the planar imaging | video apparatus 10 shown in FIG. 1 is attached to the vehicle body. It is an example of incident light and reflected light when the installation angle is changed by an angle α around the display driving unit 2. FIG. 3A shows a state in which incident light is reflected from the flat display 1 and reflected to the driver 6. 3-2 shows the state of incident light and reflected light when the installation angle of the flat video device 10 is changed by α around the display driving unit 2. It is a figure which shows an example of a state when the planar imaging | video apparatus 10 shown in FIG. 1 is attached to the vehicle body. FIG. 4A shows an optical path that is incident on the center of the flat display 1 and is directly reflected by the driver 6 therefrom. FIG. 4B shows that incident light is incident on the flat display 1 from the same direction as FIG. 4A when the display drive unit 2 is rotated around the display drive unit 2 disposed at the bottom center of the flat display device. The state of time is shown. It is an example of the photon detection part 3 shown in FIG. It is another example of the photon detection part 3 shown in FIG. It is the figure which looked at another example of the plane image device from the side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat display 2 Display drive part 3 Light detection part 5 Car body installation part 6 Driver 7 Optical slit 10 Planar imaging device 11, 12 Optical sensor 51, 52, 53, 54, 55 Optical path 61, 62, 63 Normal

Claims (4)

A flat display for displaying images;
A display driving unit for changing an installation angle of the flat display;
A light detection unit for detecting light from a specific direction;
A drive controller that controls the display driver by detecting light of the light detector;
A plane image device comprising: The flat image display device according to claim 1, wherein the display driving unit varies an installation angle about at least one axis. The flat image display device according to claim 1, wherein the light detection unit is provided with a photosensor at a bottom in a cylinder whose inner surface is non-reflective. 3. The planar image according to claim 1, wherein the light detection unit includes a light slit and a plurality of light sensors juxtaposed in a direction orthogonal to a longitudinal direction of the slit on a back surface of the slit. apparatus.

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