JP2009276593A - Head-up display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head-up display device for reducing the risk of color break. <P>SOLUTION: A display means 9 emits a plurality of color display lights by a field sequential system. A reflecting means 21 reflects the display light emitted by the display means 9. A driving means 23 rotates the reflecting means 21. A control means 12 controls the display means 9 to display monochrome light when the angle position of the reflecting means 21 is adjusted by the driving means 23. The display means 9 includes a liquid crystal display panel 16, a first light emitting element 12 and a second light emitting element 13 for illuminating the liquid crystal display panel 16, and a lighting control part 14 which turns on/off the first light emitting element 12 and the second light emitting element 13 at a predetermined timing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a head-up display device that displays a virtual image by a field sequential method.

Conventionally, various head-up display devices have been proposed, and for example, disclosed in Patent Document 1 and Patent Document 2. Such a head-up display device 1 projects the display light L emitted from the display onto the windshield 2 of the vehicle and displays a virtual image V. The vehicle driver D superimposes the virtual image on the scenery in front of the vehicle. V can be visually recognized (see FIG. 5).
JP 2003-295105 A JP 2005-315931 A

  The head-up display device disclosed in Patent Document 1 is a field sequential display device that displays a color image by irradiating a liquid crystal display panel with illumination light of a color corresponding to unit color image data for each subfield into which a field is divided. It will be. The field sequential display device sequentially selects a plurality of pixel rows of the liquid crystal display panel from the first row for each subfield obtained by dividing one field for displaying a color image composed of a plurality of colors into at least two rows. One unit color image data of two or more colors is written to each pixel, and illumination light of a color corresponding to the unit color image data written to the liquid crystal display panel is emitted from the light emitting element for each subfield. It is.

  The head-up display device 1 disclosed in Patent Document 2 includes a housing 3 in which a display 4 and a reflection mirror 5 that reflects display light L emitted from the display 4 are accommodated (see FIG. 6). ). The head-up display device 1 can adjust the angle at which the display light L is projected by changing the angle of the reflection mirror 5 by a driving means such as a stepping motor. In the initial state, the head-up display device 1 can adjust the standard height driver D. The angle of the reflecting mirror 5 is set so as to conform to the above, but the driver D1 having a high height adjusts the angle of the reflecting mirror 5 so that the display light L is reflected at the eye position of the driver D1. Thus, it is considered to apply the field sequential display device to the head-up display device 1 that can adjust the angle of the reflection mirror 5.

However, when the field sequential display device is applied to the head-up display device 1 that adjusts the angle of the reflection mirror 5 according to the position of the eyes of the vehicle drivers D and D1, the angle of the reflection mirror 5 is adjusted. In addition, the positions of the virtual images V and V1 move to cause a color break phenomenon called color break, resulting in a problem that display quality deteriorates.
The present invention has been made in view of this problem, and provides a head-up display device that can reduce the possibility of color breaks.

  According to the present invention, the display means 9 that emits display light of a plurality of colors by a field sequential method, the reflection means 21 that reflects the display light L emitted by the display means 9, and the reflection Drive means 23 for rotating the means 21; and control means 12 for making the display light emitted from the display means 9 monochromatic when the angular position of the reflection means 21 is adjusted by the drive means 23. It is a thing.

  Further, according to the present invention, the control means 12 adjusts the angular position of the reflecting means 21 when the driving means 23 adjusts the angular position of the reflecting means 21. The display means 9 is displayed on the display means 9 to indicate that the image is displayed.

  In the present invention, the display unit 9 includes a liquid crystal display panel 16, a first light emitting element 12 and a second light emitting element 13 that illuminate the liquid crystal display panel 16, The lighting control unit 14 is configured to turn on / off the first light emitting element 12 and the second light emitting element 13 at a predetermined timing.

  When the angular position of the reflecting means is adjusted by the driving means, the display light emitted from the display means is made monochromatic, so that there is little risk of color breaks.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the description of this embodiment, “right”, “left”, and “down” are directions in FIG.

  The head-up display device 8 includes a liquid crystal display 9 (display means) and a reflector 10. The liquid crystal display 9 includes a light emitting diode 12 (first light emitting element), a light emitting diode 13 (second light emitting element), a dichroic mirror 15, and a liquid crystal display panel 16. The light emitting diodes 12 and 13 are arranged so that their optical axes are substantially orthogonal to each other. One light emitting diode 12 emits red light R downward, and the other light emitting diode 13 emits green light G. Light exits to the left.

A lighting controller 14 is connected to each of the light emitting diodes 12 and 13. The lighting control unit 14 uses PWM (Pulse Width
The luminance of the light-emitting diodes 12 and 13 is controlled by a modulation method, and the light-emitting diodes 12 and 13 are switched in a field sequential manner using time-division additive color mixing by sequentially switching the light-emitting diodes 12 and 13 at high speed. To emit light.

  A dichroic mirror 15 is disposed at a position where the optical axis of the light emitting diode 12 intersects with the optical axis of the light emitting diode 13 on the traveling direction side of the red light R and green light G emitted from the light emitting diodes 12 and 13. Has been. The dichroic mirror 15 reflects the red light R emitted from the light emitting diode 12 to the left, and transmits the green light G emitted from the other light emitting diode 13. Thereby, the lights R and G of the respective light emitting diodes 12 and 13 travel in the same direction.

  A liquid crystal display panel 16 is disposed on the traveling direction side of the red light R reflected by the dichroic mirror 15 and the green light G transmitted through the dichroic mirror 15. The liquid crystal display panel 16 is a monochrome display panel on which no color filter is mounted, and forms a color image by transmitting or blocking the light R and G guided from the light emitting diodes 12 and 13.

  A display control unit 17 is connected to the liquid crystal display panel 16, and the display control unit 17 performs on / off control of the liquid crystal driving voltage in synchronization with the lighting control unit 14. A reflector 10 is disposed on the traveling direction side of the display light L transmitted through the liquid crystal display panel 16, and the display light L emitted from the liquid crystal display 9 by the reflector 10 is directed toward the windshield of the vehicle. Reflect.

  The reflector 10 includes a concave mirror 21 (reflecting means), a mirror holder 22, and a stepping motor 23 (driving means). The concave mirror 21 is formed by depositing a metal (for example, aluminum) on a resin (for example, polycarbonate) to form a reflective surface 21a. The reflecting surface 21a is a concave surface, and the display light L from the liquid crystal display 9 is enlarged to display the virtual image V. The concave mirror 21 is bonded to the mirror holder 22 with a double-sided adhesive tape. The mirror holder 22 is made of resin (for example, ABS), and the gear portion 24 and the shaft portion 25 are integrally formed.

  A gear 26 is attached to the rotation shaft of the stepping motor 23, and the gear 26 is engaged with the gear portion 24 of the mirror holder 22. The concave mirror 21 is supported so as to be rotatable together with the mirror holder 22, and the projection direction of the display light L can be adjusted by rotating the concave mirror 21 by the stepping motor 23. The vehicle driver operates a push button switch (not shown) to adjust the angle of the concave mirror 21 so that the virtual image V can be visually recognized.

  FIG. 3 is an example of a virtual image V displayed by the head-up display device 8, and the virtual image V includes a display unit 31 displayed with red light R and a display unit 32 displayed with green light G. And a display unit 33 that is displayed with yellow light that is a mixed color of red light R and green light G. When adjusting the angle of the concave mirror 21 by the stepping motor 23, the microcomputer 12 displays all the display units 31, 32, and 33 in red and displays the display unit M in red.

  FIG. 4 is a diagram showing a data writing sequence to the liquid crystal display panel 16 and a lighting sequence of the light emitting diodes 12 and 13. As soon as data writing to the liquid crystal display panel 16 starts, the liquid crystal on the first line starts to rise, and as data writing to the liquid crystal display panel 16 progresses, the liquid crystal also rises in synchronization with this, and the liquid crystal display panel 16 The liquid crystal on the last line starts to rise immediately after the data writing is completed. The lighting control unit 14 lights the light emitting diodes 12 and 13 at a predetermined timing after the data writing to the liquid crystal display panel 16 is finished, and substantially simultaneously with the falling of the first line of the liquid crystal display panel 16, 13 is turned off.

  According to the present embodiment, when the angle of the concave mirror 21 is adjusted by the stepping motor 23, the display units 31, 32, and 33 are displayed in a single color, so that no color break occurs and the display is performed. Since the part M is displayed, the vehicle driver can confirm that the angle is being adjusted, and there is no sense of incongruity even if the display parts 31, 32, 33 are displayed in a single color.

Sectional drawing which shows embodiment of this invention. The block diagram which shows embodiment same as the above. Explanatory drawing which shows the virtual image in embodiment same as the above. The timing diagram which shows embodiment same as the above. The general-view figure which shows a prior art example. Sectional drawing which shows a prior art example same as the above.

Explanation of symbols

9 Liquid crystal display (display means)
12 Microcomputer (control means)
12 Light emitting diode (first light emitting element)
13 Light emitting diode (second light emitting element)
14 lighting controller 16 liquid crystal display panel 21 concave mirror (reflecting means)
23 Stepping motor (drive means)
M display section

Claims (3)

  Display means for emitting display light of a plurality of colors by a field sequential method, reflection means for reflecting the display light emitted by the display means, drive means for rotating the reflection means, and the reflection means by the drive means A head-up display device comprising: control means for making the display light emitted from the display means monochromatic when the angular position is adjusted.   The control means causes the display means to display a display section indicating that the angular position of the reflecting means is adjusted when the angular position of the reflecting means is adjusted by the driving means. The head-up display display device according to claim 1.   The display means turns on / off a liquid crystal display panel, a first light emitting element and a second light emitting element that illuminate the liquid crystal display panel, and the first light emitting element and the second light emitting element at a predetermined timing. The head-up display device according to claim 1, further comprising: a lighting control unit that is turned off.

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