Display driver and mobile electronic device

• US 10,580,118 B2
• Filed: 05/02/2018
• Issued: 03/03/2020
• Est. Priority Date: 11/21/2017
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Hwa Hyun, Ko, Yoon Ho, Yu, Tae Kon, Lee, Jae Youl
• Primary Examiner(s): Brier, Jeffery A
• Application Number:
  US15/968,963
• Publication Number:
  US 20190156466A1
• Time in Patent Office: 671 Days
• CPC Class Codes: G06F 1/163 Wearable computers, e.g. on a belt
• CPC Class Codes: G06F 1/169 the I/O peripheral being an integrated pointing device, e.g. trackball in the palm rest area, mini-joystick integrated between keyboard keys, touch pads or touch stripes G06F1/1643 takes precedence; constructional details of pointing devices G06F3/033
• CPC Class Codes: G06F 3/01 Input arrangements or combined input and output arrangements for interaction between user and computer G06F3/16 takes precedence
• CPC Class Codes: G06F 3/011 Arrangements for interaction with the human body, e.g. for user immersion in virtual reality blind teaching G09B21/00
• CPC Class Codes: G06T 1/60 Memory management
• CPC Class Codes: G06T 5/80 Geometric correction
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/14 Solving problems related to the presentation of information to be displayed
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165

Abstract

A display driver includes an interface circuit configured to receive an input image of a virtual reality (VR) experience from at least one of an application processor (AP) and a graphics processing unit (GPU); a coordinate correction circuit configured to generate corrected coordinates by adjusting input coordinates of pixels included in the input image; and an image generation circuit configured to generate an output image by distorting the input image using the corrected coordinates.

Claims

1. A display driver, comprising:

an interface circuit configured to receive an input image of a virtual reality (VR) experience from at least one of an application processor (AP) and a graphics processing unit (GPU);

a coordinate correction circuit configured to generate corrected coordinates by adjusting input coordinates of pixels included in the input image; and

an image generation circuit configured to generate an output image by distorting the input image using the corrected coordinates.

2. The display driver of claim 1, wherein,

the image generation circuit includes a buffer configured to store at least a portion of the input image, and

the image generation circuit is configured to distort the at least a portion of the input image stored in the buffer using the corrected coordinates.

3. The display driver of claim 2, wherein the buffer comprises a plurality of line memories configured to store data in a single row of the input image or data in a single column of the input image.

4. The display driver of claim 2, wherein the image generation circuit is configured such that the output image includes,

a first region in which the input image is distorted to be displayed, and

a second region surrounding the first region and displayed in black.

5. The display driver of claim 4, wherein data amount of the at least a portion of the input image stored in the buffer is determined depending on a size of the second region.

6. The display driver of claim 1,

wherein the coordinate correction circuit is configured to,

convert first rectangular coordinates corresponding to the input coordinates into polar coordinates based on a central portion of the input image to generate first polar coordinates;

adjust the first polar coordinates to generate second polar coordinates;

convert the second polar coordinates into rectangular coordinates to generate second rectangular coordinates; and

generate the corrected coordinates using the second rectangular coordinates.

7. The display driver of claim 6, wherein the coordinate correction circuit is configured to generate the second polar coordinates by adjusting only a radius value of the first polar coordinates.

8. The display driver of claim 6, wherein the coordinate correction circuit is configured to reduce a radius value of the first polar coordinates corresponding to a red channel of the input image and increase the radius value of the first polar coordinates corresponding to a blue channel of the input image.

9. The display driver of claim 8, wherein the coordinate correction circuit is configured such that the coordinate correction circuit does not adjust the first polar coordinates corresponding to a green channel of the input image.

10. The display driver of claim 6, wherein the coordinate correction circuit is configured to apply barrel distortion to the input image by adjusting the first polar coordinates to generate the second polar coordinates.

11. The display driver of claim 6, wherein the coordinate correction circuit is configured to interpolate the second rectangular coordinates to generate the corrected coordinates including only an integer value.

12. The display driver of claim 1, wherein the coordinate correction circuit is configured to generate the corrected coordinates based on at least one of,

a curvature of a lens through which the output image passes, and

a focal length of the lens.

13. A display driver, comprising:

an interface circuit configured to receive an input image of a virtual reality (VR) experience in response to a first sync signal;

a source driver configured to input an output image, generated from the input image, to a display panel in response to a second sync signal, the first and second sync signals having a same period, the second sync signal being delayed by a first delay time, relative to the first sync signal; and

an image generation circuit configured to distort the input image during the first delay time to generate the output image, the output image including,

a first region in which the input image is distorted to be displayed, and

a second region that surrounds the first region and is to be displayed in black.

14. The display driver of claim 13, wherein,

the source driver is configured to sequentially input first output data, second output data, and third output data to the display panel during a single period of the second sync signal,

the first output data and the third output data correspond to the second region, and

the second output data corresponds to the first region.

15. The display driver of claim 14, wherein the first output data and the third output data are identical to each other.

16. The display driver of claim 14, wherein the first output data, the second output data, and the third output data are provided as data corresponding to a single row or column of the output image.

17. The display driver of claim 13, further comprising:

a timing controller,

the timing controller being configured to generate the first sync signal and the second sync signal such that a single period of the first sync signal and the second sync signal is as a time during which one of a plurality of gate lines included in the display panel is scanned.

18. The display driver of claim 13, wherein the image generation circuit is configured to generate the output image through radial distortion of the input image.

19. The display driver of claim 18, further comprising:

a buffer configured to store at least a portion of the input image,

wherein capacity of the at least a portion of the input image stored in the buffer is proportional to a degree of radial distortion of the input image by the image generation circuit.

20. A mobile electronic device, comprising:

an application processor (AP) configured to generate an input image to provide a virtual reality (VR) experience;

at least one lens configured to be located adjacent to eyes of a user, when a user uses the mobile electronic device to experience the VR experience;

a display driver configured to generate an output image through radial distortion of the input image to correct chromatic aberration and pincushion distortion caused by the lens; and

a display device including a display panel configured to receive the output image from the display driver and to display the output image.