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EP-4738321-A1 - CIRCUIT DEVICE AND HEAD-UP DISPLAY

EP4738321A1EP 4738321 A1EP4738321 A1EP 4738321A1EP-4738321-A1

Abstract

A circuit device includes a buffer memory that stores input image data and a distortion correction circuit that performs distortion correction on an input image. An output image includes a first output-side area projected by a first optical system and a second output-side area projected by a second optical system. The distortion correction circuit converts output-side coordinates into input-side coordinates. When the first output-side area includes the output-side coordinates and the input-side coordinates do not belong to a first input-side area, the distortion correction circuit sets pixel data of output image data at the output-side coordinates to predetermined color data. When the second output-side area includes the output-side coordinates and the input-side coordinates do not belong to a second input-side area, the distortion correction circuit sets the pixel data of the output image data at the output-side coordinates to the predetermined color data.

Inventors

  • Akiba, Yasutoshi

Assignees

  • Seiko Epson Corporation

Dates

Publication Date
20260506
Application Date
20251028

Claims (10)

  1. A circuit device for controlling a display device that projects an image by a first optical system and a second optical system, the circuit device comprising: a buffer memory that stores input image data that is image data of an input image; and a distortion correction circuit that performs distortion correction on the input image and outputs output image data that is image data of an output image, wherein the output image includes a first output-side area projected by the first optical system and a second output-side area projected by the second optical system, and the distortion correction circuit converts output-side coordinates of the output image into input-side coordinates of the input image, when the first output-side area includes the output-side coordinates, determines whether the input-side coordinates belong to a first input-side area set to correspond to the first output-side area, when the input-side coordinates do not belong to the first input-side area, sets pixel data of the output image data at the output-side coordinates to predetermined color data, when the second output-side area includes the output-side coordinates, determines whether the input-side coordinates belong to a second input-side area set to correspond to the second output-side area, and when the input-side coordinates do not belong to the second input-side area, sets the pixel data of the output image data at the output-side coordinates to the predetermined color data.
  2. The circuit device according to claim 1, further comprising a storage circuit that stores area setting information for setting the first output-side area, the first input-side area, the second output-side area, and the second input-side area, wherein the distortion correction circuit determines whether the output-side coordinates belong to the first output-side area, whether the input-side coordinates belong to the first input-side area, whether the output-side coordinates belong to the second output-side area, and whether the input-side coordinates belong to the second input-side area based on the area setting information.
  3. The circuit device according to claim 1, wherein a first conversion area obtained by coordinate conversion of the first output-side area to the input side overlaps the first input-side area and a part of the second input-side area, and a second conversion area obtained by coordinate conversion of the second output-side area to the input side overlaps the second input-side area and a part of the first input-side area.
  4. The circuit device according to claim 1, wherein the distortion correction circuit selects a first distortion correction table corresponding to the first optical system and converts the output-side coordinates into the input-side coordinates using the first distortion correction table when the first output-side area includes the output-side coordinates, and selects a second distortion correction table corresponding to the second optical system and converts the output-side coordinates into the input-side coordinates using the second distortion correction table when the second output-side area includes the output-side coordinates.
  5. The circuit device according to claim 1, wherein the distortion correction circuit converts the output-side coordinates into the input-side coordinates using a distortion correction table, and the distortion correction table is a table that associates the output-side coordinates belonging to the first output-side area with the input-side coordinates for distortion correction corresponding to the first optical system, and associates the output-side coordinates belonging to the second output-side area with the input-side coordinates for distortion correction corresponding to the second optical system.
  6. The circuit device according to claim 1, comprising an image selection circuit that selects image data of the first input-side area and image data of the second input-side area from the input image data and stores the selected image data in the buffer memory.
  7. The circuit device according to claim 1, wherein the first output-side area and the second output-side area are arranged in a horizontal direction, and the first input-side area and the second input-side area are arranged in the horizontal direction.
  8. The circuit device according to claim 1, wherein the display device projects the output image onto a projection surface using the first optical system and the second optical system, and the distortion correction corrects distortion of the first optical system and the second optical system or image distortion caused by distortion of the projection surface.
  9. The circuit device according to claim 1, wherein the predetermined color data is color data to be transparent when displayed by the display device.
  10. A head-up display comprising: the circuit device according to claim 1; and the display device that projects the output image using the first optical system and the second optical system.

Description

The present application is based on, and claims priority from JP Application Serial Number 2024-190599, filed October 30, 2024, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a circuit device, a head-up display, and the like. 2. Related Art JP-A-2017-045312 discloses an image generation apparatus that corrects distortion of an image captured by a wide-angle lens. An image obtained by correcting distortion of the image captured by the wide-angle lens is set as a target image. A semicircular indefinite area with no image formed therein is formed at the periphery edge of the target image. The image generation apparatus sets a rectangular mask area that covers an end portion of the target image with the indefinite area, and fills the mask area with a designated color. JP-A-2017-045312 is an example of the related art. When distortion correction is performed on a plurality of areas of an image using a plurality of warp parameters, in distortion correction of a certain area, a failure may occur in display between the areas by referring to images of adjacent areas. Due to the failure, for example, a user may have a feeling of strangeness. SUMMARY An aspect of the present disclosure relates to a circuit device for controlling a display device that projects an image by a first optical system and a second optical system, the circuit device includes a buffer memory that stores input image data that is image data of an input image, and a distortion correction circuit that performs distortion correction on the input image and outputs output image data that is image data of an output image, wherein the output image includes a first output-side area projected by the first optical system and a second output-side area projected by the second optical system among the output image, and the distortion correction circuit converts output-side coordinates of the output image into input-side coordinates of the input image, when the first output-side area includes the output-side coordinates, determines whether the input-side coordinates belong to a first input-side area set to correspond to the first output-side area, when the input-side coordinates do not belong to the first input-side area, sets pixel data of the output image data at the output-side coordinates to predetermined color data, when the second output-side area includes the output-side coordinates, determines whether the input-side coordinates belong to a second input-side area set to correspond to the second output-side area, and when the input-side coordinates do not belong to the second input-side area, sets the pixel data of the output image data at the output-side coordinates to the predetermined color data. Another aspect of the present disclosure relates to a head-up display including the circuit device described above and a display device that projects the output image using the first optical system and the second optical system. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a configuration example of a display device provided in an HUD.FIG. 2 shows distortion correction in the HUD using a plurality of optical systems.FIG. 3 shows unnecessary displays.FIG. 4 shows a first configuration example of the head-up display.FIG. 5 shows a detailed configuration example of a distortion correction circuit.FIG. 6 shows an example of areas set by area setting information.FIG. 7 shows a processing flow example of the distortion correction circuit.FIG. 8 is an example of a processing flow of area determination, warp processing, and pixel data generation.FIG. 9 is an example of the processing flow of area determination, warp processing, and pixel data generation.FIG. 10 shows an example in which display areas are arranged in a vertical direction.FIG. 11 shows a detailed configuration example of a distortion correction circuit in a second configuration example of the HUD.FIG. 12 shows a configuration example of a circuit device in a third configuration example of the HUD.FIG. 13 shows a detailed configuration example of a distortion correction circuit in the third configuration example of the HUD.FIG. 14 shows an operation of the distortion correction circuit in the third configuration example. DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present disclosure will be described in detail. The following embodiments do not unduly limit the description in "What is Claimed is", and not all of the configurations described in the embodiments are necessarily essential component elements. An example in which a distortion correction method of the present disclosure is applied to a head-up display will be described below. However, the distortion correction method of the present disclosure can be applied to any display system that projects an image by a plurality of optical systems, for example, a projector. Hereinafter, the head-up display may be abbreviated as HUD