Drawing device of move-target image and display system for vehicle

• US 8,830,260 B2
• Filed: 12/08/2009
• Issued: 09/09/2014
• Est. Priority Date: 12/08/2008
• Status: Active Grant

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: Ogasawara, Kazuyoshi, Iwazaki, Katsuhiko
• Primary Examiner(s): HARRISON, CHANTE E
• Application Number:
  US13/133,015
• Publication Number:
  US 20110235943A1
• Time in Patent Office: 1,736 Days
• Field of Search: 345/619, 345/690, 345/76, 345/89, 345/440, 340/438, 340/462
• US Class Current: 345/619
• CPC Class Codes: G01D 11/28 Structurally-combined illuminating devices
• CPC Class Codes: G01D 7/00 Indicating measured values
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

Afterimages of a move-target image which is moved at high speed are reduced even if a display unit with slow response characteristics is used. A drawing device for continuously drawing a move-target image as a moving picture on a display image displayed on a display unit includes: a drawing position identification unit which identifies a current drawing position at which the move-target image is drawn on the display screen; a past drawing position storage unit in which is stored a prescribed number of past drawing positions where the move-target image is drawn previously; an afterimage-reducing region detection unit which detects an afterimage-reducing region of the move-target image, the afterimage reducing region extending from the current drawing position to any one of the past drawing positions; an afterimage-reducing image drawing unit which draws an afterimage-reducing image in the afterimage reducing region; and a move-target image drawing unit which draws the move-target image at the current drawing position.

Claims

1. A drawing device for continuously drawing a move-target image as a moving picture on a display image displayed on a display unit, the drawing device comprising:

a drawing position identification unit which is configured to identify a current drawing position at which the move-target image is drawn on the display screen;

a past drawing position storage unit in which is stored a plurality of past drawing positions where the move-target image is drawn previously;

an afterimage-reducing region detection unit which is configured to detect an afterimage-reducing region of the move-target image;

an afterimage-reducing image drawing unit which is configured to draw an afterimage-reducing image in the afterimage reducing region;

a move-target image drawing unit which is configured to draw the move-target image at the current drawing position; and

an afterimage-reducing region dividing unit which is configured to divide the afterimage-reducing region into a plurality of afterimage-reducing divided regions, wherein

the afterimage-reducing image drawing unit draws each of divided afterimage-reducing images to be drawn in the plurality of afterimage-reducing divided regions so that its gradation is reduced step-by-step as it gets away from the move-target image, and wherein

the afterimage-reducing region dividing unit selects a first past drawing position from the plurality of past drawing positions, the afterimage-reducing region extending from the current drawing position to the selected first past drawing position, and

the afterimage-reducing region dividing unit selects one or more second past drawing positions from the plurality of past drawing positions, the one or more second past drawing positions existing between the first past drawing position and the current drawing position, wherein the plurality of afterimage-reducing divided regions are based on the current drawing position, the first past drawing position and the one or more second past drawing positions.

2. The drawing device according to claim 1, comprising:

a previous move-target image erasing unit which is configured to erase a previous move-target image in accordance with an identification of the current drawing position performed by the drawing position identification unit.

3. The drawing device according to claim 1, wherein

the move-target image is an image which indicates a display of rotating a pointer, and

the afterimage-reducing image drawing unit draws each of divided afterimage-reducing images to be drawn in the plurality of afterimage-reducing divided regions so that its gradation is reduced gradually as it comes close to a rotational center of the pointer.

4. A display system for a vehicle comprising the drawing device according to claim 1.

5. The drawing device according to claim 1, wherein

the plurality of afterimage-reducing divided regions are generated based on coordinates of the current drawing position and the plurality of stored past drawing positions.

6. The drawing device according to claim 1, wherein

the plurality of afterimage-reducing divided regions are generated by dividing the afterimage-reducing region with a center line connecting a root and a head of each of the plurality of stored past drawing positions.

7. The drawing device according to claim 1, wherein

the plurality of afterimage-reducing divided regions at least includes a first divided region between the current drawing position and the one or more second past drawing positions, and a second divided region between the first past drawing position and the one or more second past drawing positions.