JP2019169828A - On-vehicle display control unit and on-vehicle display control method - Google Patents

Abstract

To provide a head-up display device in which the position of a driver's eye moves.SOLUTION: An on-vehicle display control unit performs display control when causing a display unit to display a display image projected by the display unit on a projection target part, and comprises: a position acquisition unit that acquires the position of a driver's eye; a movement speed acquisition unit that acquires the movement speed of the position of the eye; a storage unit that stores in advance distortion correction parameters when the position of the eye is at the apices of diagrams obtained by dividing a visible range of the display image into plurality; and a display control unit that acquires, from the storage unit, any one of the distortion correction parameters on the basis of the position of the eye, or performs interpolation processing on the distortion correction parameter to calculate an interpolated distortion correction parameter, and corrects distortion of the display image projected on the projection target part at a distance interval according to the movement speed acquired by the movement speed acquisition unit, on the basis of any one of the distortion correction parameter or the interpolated distortion correction parameter.SELECTED DRAWING: Figure 1

Description

A so-called head-up display device (hereinafter referred to as HUD) is known as a display device that displays information to a driver of a vehicle. The HUD projects a display image displayed on a display unit such as a liquid crystal display panel on a projection target unit such as a windshield so that a driver can visually recognize guidance information necessary for driving.

The HUD is normally configured to correct distortion using a distortion correction parameter at the center position of a visible range (hereinafter referred to as an eyebox) for the driver. However, when the position of the driver's eyes moves in the eye box, the virtual image projected on the HUD becomes distorted accordingly, and it is necessary to correct the distortion correction parameter for correcting the distortion. In the present invention, the distortion correction parameter is updated in accordance with the speed at which the position of the driver's eyes moves, so that the consistency of the virtual image visually recognized by the driver is maintained.

Conventionally, a distortion correction parameter when a driver's eye is positioned at the apex of a lattice obtained by dividing the eyebox into two parts vertically and horizontally is stored, and the distortion correction parameter according to the position of the driver's eye is stored. The distortion of the virtual image is corrected by interpolation processing.

JP 2014-199385 A

  However, the position of the driver's eyes is rarely fixed, and the position of the driver's eyes is constantly moving due to the road surface condition during driving, the driver's head swing, and the like. However, the above document does not disclose that the distortion correction parameter to be applied is changed as the position of the driver's eyes moves.

In order to solve the above-described problem, the vehicle-mounted display control device of the present invention is a vehicle-mounted display control device that performs display control when the display unit displays a display image to be projected on the projection unit. Distortion correction when a position acquisition unit that acquires the position of the eye, a movement speed acquisition unit that acquires the movement speed of the position of the eye, and the position of the eye is at the vertex of a figure that divides the viewable range of the display image Either a storage unit storing parameters in advance and a distortion correction parameter are acquired from the storage unit based on the eye position, or an interpolation distortion correction parameter is calculated by interpolating the distortion correction parameter to obtain a distortion correction parameter. Alternatively, display control for correcting distortion of the display image projected on the projection target part at a distance interval corresponding to the movement speed acquired by the movement speed acquisition unit based on any of the interpolation distortion correction parameters Characterized in that it comprises a and.

An in-vehicle display control method according to the present invention is an in-vehicle display control method for performing display control when a display image displayed on a projection unit is displayed on a display unit in order to solve the above-described problem. A position acquisition step for acquiring the eye position, a movement speed acquisition step for acquiring the movement speed of the eye position, and distortion correction when the eye position is at the vertex of a figure obtained by dividing the viewable range of the display image From the storage unit that stores the parameters in advance, either distortion correction parameters are acquired based on the eye position, or the distortion correction parameters are interpolated to calculate the interpolation distortion correction parameters, and the distortion correction parameters or the interpolation distortion are calculated. Display that corrects distortion of the display image projected on the projection unit at a distance interval according to the movement speed acquired by the movement speed acquisition unit based on one of the correction parameters Characterized in that it comprises a control step.

  According to the present invention, by updating the distortion correction parameter based on the movement speed of the driver's eyes, it is possible to efficiently update using the distortion correction parameter considering the movement of the driver's eyes. is there.

Block diagram of in-vehicle display control device of the present invention The figure which shows the relationship with a driver | operator's eye, a windshield, and a virtual image Illustration explaining eyebox Shape of virtual image seen from each vertex of eye box The figure explaining the distortion correction timing of the virtual image by the distortion correction parameter when the driver's eyes move The figure which shows the flowchart of the vehicle-mounted display control method of this invention

Embodiment 1

As shown in FIG. 1, the in-vehicle display control device 15 of the present invention includes a display control unit 11, a position acquisition unit 12, a moving speed acquisition unit 13, and a storage unit 14. In addition, HUD is comprised by the vehicle-mounted display control apparatus 15, the display part 16, and the to-be-projected part 17 of this invention.

Based on FIG.1 and FIG.2, the vehicle-mounted display control apparatus of this invention is demonstrated. The display image generated by the display control unit 11 is displayed on the display unit 16, the display image displayed by the display unit 16 is reflected by the projection unit 17, guided to the driver's eyes 21, and a virtual image 23 of the display image. To the driver's eye 21.

The projected part 17 is configured by a windshield 22 or a half mirror called a combiner (not shown). The display unit 16 includes, for example, a liquid crystal display and a backlight white LED (Light Emitting-Diode) for projecting a display image displayed on the liquid crystal display.

As shown in FIG. 2, the direction in which the driver's eye 21 gazes at the windshield 22 from the driver's seat is defined as the z direction, and an xy plane orthogonal to the z axis is defined. The position acquisition unit 12 acquires the coordinate position of the driver's eye 21 on the xy plane. This coordinate position is necessary for setting a distortion correction parameter for correcting the distortion of the virtual image in accordance with the position of the driver's eye 21 described later. This can be configured by an imaging device such as a camera or a sensor for monitoring a driver that is previously positioned and installed in the vehicle. At this time, the movement of the driver's eyes 21 in the z direction does not need to be particularly considered by adjusting the focal length of the eyes as long as the driver is viewing a virtual image.

FIG. 3 is a schematic diagram for explaining an eye box 24 that is a range in which the virtual image 23 is visually recognized from the driver's eye 21. The horizontal length of the eye box 24 is L, and the vertical length is S. For example, it is a rectangle with L = 130 mm and S = 40 mm.

The distortion correction using the distortion correction parameter will be described with reference to FIG. In FIG. 3, assuming that the eye box (eye box) is an area surrounded by P1, P2, P3, and P4, when the driver's eye 21 is located in this area, the missing virtual image (so-called vignetting) is not exist. When the driver's eye 21 is positioned at the center P0 of the eye box, the virtual image is corrected by the distortion correction parameter at P0, and becomes a rectangle without distortion equivalent to the display image. The virtual images 31 to 34 that appear as the driver's eyes move to the vertices P1, P2, P3, and P4 of the eye box with the distortion correction parameter in P0 applied are actually shown in FIG. 4B, FIG. 4C, and FIG. 4D, a distorted image different from the display image is obtained.

Here, distortion correction parameters when the driver's eye 21 is positioned at the vertex of the eyebox are obtained in advance, and distortion correction parameters CT1 (corresponding to the vertex P1), CT2 (corresponding to the vertex P2), CT3 (vertex P3) of each vertex. ) And CT4 (corresponding to the vertex P4), by correcting the distortion of the virtual image at each vertex, each virtual image becomes a rectangle without distortion. The distortion correction parameter CT0 and the distortion correction parameters CT1 to CT4 at the center P0 of the eye box are stored in the storage unit 14 of FIG. 1 in association with the position information of the driver's eye 21.

In the present invention, the human eye takes advantage of the fact that a difference in a time interval shorter than a certain time (tr: time resolution; for example, 50 ms to 100 ms) is difficult to sense, and updates the correction parameter to update the movement speed of the driver's eye. Based on.

FIG. 5 illustrates the virtual image distortion correction timing based on the distortion correction parameter when the driver's eye 21 moves. Assuming that the driver's eye 21 is located at P0 and moved in the horizontal direction at the speed Ve, the interpolation process is performed in advance from (Equation 1) at a position Pn separated by a distance calculated by Ve × tr (time resolution described above). A distortion correction parameter CTPn is obtained from the obtained distortion correction parameter and applied to distortion correction.
(Formula 1)
CTPn = ((CT2 + CT3) / 2−CT0) × Ve × tr / (L / 2) + CT0
Thereafter, in a situation where eye movement continues, a distortion correction parameter is obtained at a position separated by Ve × tr in the eye box, and the value is continuously applied to the distortion correction.

When the driver's eye 21 moves in the horizontal direction at a speed half the Ve from the state where the driver's eye 21 is located at Pm, a distortion correction parameter is obtained by interpolation processing at a position Pm + 1 separated by Ve × tr / 2. Correction is performed, distortion correction parameters are obtained by the same method at a position Pm + 2 separated by Ve × tr, and distortion correction may be applied.

The moving speed Ve of the driver's eye 21 is determined by identifying the driver's eye 21 from the image output of the position acquisition unit 12, and the eye position on the image sensor, the frame speed of the image output and the position acquisition unit 12 and the driver. This function is realized by the moving speed acquisition unit 13 of FIG.

A series of operations will be described based on the flowchart shown in FIG. Based on the image of the image sensor obtained by the position acquisition unit 12, the position of the driver's eye 21 is specified by the moving speed acquisition unit 13, and the eye position on the image sensor is determined on the eye box determined in advance. The position is acquired (S1), and the moving speed of the identified driver's eyes is acquired (S2). When the driver's eye 21 is not moving (S3: No), the distortion correction parameter at that position is acquired from the storage unit 6 (S5), and distortion correction is applied (S6). When the driver's eye 21 is moving (S3: Yes) and the moving speed exceeds a predetermined value (for example, 50 cm / sec) (S4: No), the driver's eye 21 is diverted from the virtual image by turning left or right, etc. Since it is presumed that the position of any eye will return to the original position, distortion correction is not performed (the virtual image does not follow the movement of the eye) and the state is maintained. If the movement speed of the driver's eye 21 is equal to or less than a predetermined value, the distortion correction parameter at a position separated by the eye movement speed V × tr is acquired from the storage unit 14 or the distortion correction parameter acquired from the storage unit 14 is interpolated. Then (S5) distortion correction is performed (S6).

According to the present invention, the update by the movement of the driver's eyes can be efficiently performed by updating the correction parameter based on the movement speed of the driver's eyes.

In addition to the above, within the scope of the present invention, any component of the embodiment can be modified or any component of the embodiment can be omitted.

11 display control unit, 12 position acquisition unit, 13 movement speed acquisition unit, 14 storage unit,
15 vehicle-mounted display control device, 16 display unit, 17 projection unit,
21 driver's eye, 22 windshield, 23 virtual image, 24 eyebox,
31 P1 virtual image, 32 P2 virtual image, 33 P3 virtual image,
34 Virtual image visible from P4

Claims (5)

An in-vehicle display control device that performs display control when a display image to be projected by a display unit on a projection unit is displayed on the display unit,
A position acquisition unit that acquires the position of the occupant's eyes;
A moving speed acquisition unit that acquires the moving speed of the eye position;
A storage unit that stores in advance distortion correction parameters when the position of the eye is at the apex of a figure obtained by dividing the viewable range of the display image;
One of the distortion correction parameters is acquired from the storage unit based on the eye position, or the distortion correction parameter is calculated by interpolating the distortion correction parameter, and the distortion correction parameter or the interpolation distortion is calculated. A display control unit configured to correct distortion of the display image projected on the projection target unit at a distance interval corresponding to the movement speed acquired by the movement speed acquisition unit based on any of the correction parameters;
A vehicle-mounted display control device comprising: When the eye position is in a visible range of the display image, the display control unit performs an interpolation process on a distortion correction parameter of a vertex of the graphic including the eye position, and the interpolation distortion correction parameter The vehicle-mounted display control device according to claim 1, wherein: The in-vehicle display control device according to claim 1, wherein the distance interval becomes longer as the moving speed increases. The in-vehicle display control device according to claim 1, wherein the distortion is not corrected when the moving speed exceeds a predetermined speed. An in-vehicle display control method for performing display control when displaying a display image to be projected on a projection target by a display unit on the display unit,
A position acquisition step for acquiring the position of the occupant's eyes;
A movement speed acquisition step of acquiring a movement speed of the eye position;
One of the distortion correction parameters is stored on the basis of the eye position from a storage unit that stores in advance a distortion correction parameter when the eye position is at the apex of a figure obtained by dividing the viewable range of the display image. The movement speed acquired by the movement speed acquisition unit based on either the distortion correction parameter or the interpolation distortion correction parameter is obtained by calculating the interpolation distortion correction parameter by interpolating the distortion correction parameter. A display control step of correcting distortion of the display image projected on the projection target part at a distance interval according to
A vehicle-mounted display control method comprising:

Images