DISPLAY DEVICE AND IMAGE PROCESSING DEVICE

• US 20150339966A1
• Filed: 05/11/2015
• Published: 11/26/2015
• Est. Priority Date: 05/23/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: HARADA, Tsutomu, UCHIYAMA, Hiroki, NAGATSUMA, Toshiyuki
• Granted Patent: US 9,552,758 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06T 1/20 Processor architectures; Processor configuration, e.g. pipelining
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• 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
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables
• CPC Class Codes: H04N 1/46 Colour picture communication systems
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence

Abstract

A display device includes an image processing unit that performs image processing on image data input from the outside, and performs display output corresponding to the image data on which image processing is performed by the image processing unit. The image processing unit includes a first processing circuit that simply replaces colors of an image to limit the number of colors used for the image to a predetermined number equal to or smaller than 16, a second processing circuit that performs image processing including arithmetic processing for improving luminance of a plurality of pixels constituting the image displayed on the display device corresponding to the image data; and a switching unit that causes the second processing circuit to perform image processing, and causes the first processing circuit to perform image processing when performing the image processing while saving more power than the second processing circuit.

Claims

1. A display device comprising an image processing unit that performs image processing on image data input from outside, and performing display output corresponding to the image data on which image processing is performed by the image processing unit,

the image processing unit comprising:

a first processing circuit that simply replaces colors of an image to limit number of colors used for the image to a predetermined number equal to or smaller than 16;

a second processing circuit that performs image processing including arithmetic processing for improving luminance of a plurality of pixels constituting the image displayed on the display device corresponding to the image data; and

a switching unit that causes any one of the first processing circuit and the second processing circuit to perform image processing, wherein

the switching unit causes the second processing circuit to perform image processing, and causes the first processing circuit to perform image processing when performing the image processing while saving more power than the second processing circuit.

2. The display device according to claim 1, wherein the first processing circuit determines each color of the pixels corresponding to a correspondence relation between coordinates of each of the pixels and a position in a display area of the display device.

3. The display device according to claim 1, wherein the first processing circuit is capable of using, for the image, eight colors to which white is added.

4. The display device according to claim 1, wherein the first processing circuit determines colors of the pixels constituting the image based on a correspondence relation between a color value that is adoptable for the image and the predetermined number of colors.

5. The display device according to claim 1, wherein the display device is a transmissive liquid crystal display device.

6. The display device according to claim 1, wherein the display device is a reflective liquid crystal display device.

7. An image processing device that performs image processing on image data input from outside and outputs the image data to a display device, the image processing device comprising:

a first processing circuit that simply replaces colors of an image to limit number of colors used for the image to a predetermined number equal to or smaller than 16;

a second processing circuit that performs image processing including arithmetic processing for improving luminance of a plurality of pixels constituting the image displayed on the display device corresponding to the image data; and

a switching unit that causes any one of the first processing circuit and the second processing circuit to perform image processing, wherein

the switching unit causes the second processing circuit to perform image processing, and causes the first processing circuit to perform image processing when performing the image processing while saving more power than the second processing circuit.