Display controller, electronic apparatus and method for supplying image data

• US 20050270304A1
• Filed: 05/26/2005
• Published: 12/08/2005
• Est. Priority Date: 06/02/2004
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Obinata, Atsushi
• Application Number:
  US11/138,035
• Publication Number:
  US 20050270304A1
• Time in Patent Office: Days
• US Class Current: 345/604
• 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
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/363 Graphics controllers
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85

Abstract

A display controller includes a memory in which image data as a YUV format and image data as a RGB format are mixedly stored, a format conversion part 30 that performs a conversion processing between the YUV format and the RGB format, an image data input interface that supplies input image data as the YUV format to the memory, and a display driver interface that outputs image data as the RGB format read from the memory to the display driver. The format conversion part converts image data as the YUV format retrieved from the memory to the RGB format so as to write it in the memory, and supplies the image data as the RGB format to the display driver.

Claims

1. A display controller that supplies image data to a display driver driving a display panel, comprising:

a memory in which image data in a YUV format and image data in a RGB format are mixedly stored;

a format conversion part that performs a conversion processing between the image data in the YUV format and the image data in the RGB format;

an image data input interface to which the image data in the YUV format is input, the image data being supplied to the memory; and

a display driver interface that outputs the image data in the RGB format read from the memory to the display driver;

wherein

the format conversion part reads the image data in the YUV format from the memory to convert the image data to the RGB format, writing the converted image data in the RGB format in the memory, and the image data in the RGB format written in the memory by the format conversion part is supplied to the display driver.

2. The display controller according to claim 1, wherein

the format conversion part sets a first write start address of the converted image data in the RGB format in the memory so that a memory region in the memory is provided in which the image data in the YUV format before conversion is stored, while the converted image data in the RGB format is written so as to be overlapped, and, while updating a write address based on the first write start address, writes the image data in the RGB format in the memory region in the memory specified by the write address.

3. The display controller according to claim 2, wherein

in a case where a memory region of the image data in the YUV format before conversion is designated by a first start address and a first end address, the first write start address is smaller than an address obtained by subtracting an address corresponding to a data size of the converted image data in the RGB format from the first end address.

4. The display controller according to claim 1, further comprising a host interface to which at least one of the image data in the YUV format and the image data in the RGB format is input from the host so as to supply the image data to the memory, while by which at least one of the image data in the YUV format and the image data in the RGB format that are read from the memory is output to the host, wherein the format conversion part reads the image data in the RGB format to convert the image data to the YUV format, writing the converted image data in the YUV format in the memory, and the image data in the YUV format written in the memory by the format conversion part is output.

5. The display controller according to claim 4, wherein

the format conversion part sets a second write start address of the converted image data in the YUV format in the memory so that a memory region in the memory is provided in which the image data in the RGB format before conversion is stored, while the converted image data in the YUV format is written so as to be overlapped, and, while updating a write address based on the second write start address, writes the image data in the YUV format in the memory region in the memory specified by the write address.

6. The display controller according to claim 5, wherein

in a case where a memory region of the image data in the RGB format before conversion is designated by a second start address and a second end address in the memory, the second write start address is at least one of the second start address and smaller than the second start address.

7. The display controller according to claim 4, wherein

the format conversion part includes a first and a second format conversion parts each of which performs a format conversion processing and a write processing of the converted image data in the memory individually, wherein the first format conversion part reads the image data in the YUV format from the memory to convert the image data to the RGB format, writing the converted image data in the RGB format in the memory, while the second format conversion part reads the image data in the RGB format from the memory to convert the image data to the YUV format, writing the converted image data in the YUV format in the memory.

8. An electronic apparatus comprising:

a display panel;

the display controller according to claim 1;

and

a display driver driving the display panel based on image data supplied by the display controller.

9. The electronic apparatus according to claim 8, further comprising a host that inputs and outputs at least one of the image data in the RGB format and the YUV format relative to the display controller.

10. A method for supplying image data to a display driver driving a display panel, comprising:

storing image data in a YUV format and image data in a RGB format mixedly in a memory;

reading the image data in the YUV format from the memory so as to convert the image data to the RGB format;

writing the converted image data in the RGB format in the memory; and

supplying the image data in the RGB format written in the memory to the display driver.

11. The method supplying image data according to claim 10, further comprising:

reading the image data in the RGB format from the memory so as to convert the image data to the YUV format;

writing the converted image data in the YUV format in the memory; and

supplying the image data in the YUV format written in the memory to a host.