Display apparatus and control method thereof

• US 8,314,802 B2
• Filed: 12/20/2007
• Issued: 11/20/2012
• Est. Priority Date: 07/25/2007
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Pyo, Se-jin
• Primary Examiner(s): Welch, David T
• Application Number:
  US11/960,796
• Publication Number:
  US 20090027413A1
• Time in Patent Office: 1,797 Days
• Field of Search: 345/501, 345/42, 345/63, 345/77
• US Class Current: 345/501
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/28 using luminous gas-discharge panels, e.g. plasma panels
• CPC Class Codes: G09G 3/294 for lighting or sustain discharge
• 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

Abstract

There are provided a display apparatus and a control method thereof. The display apparatus includes: a display unit displaying an image; an image processing unit which processes an input image signal of a predetermined initial data bit and provides the processed image signal to the display unit; a storage unit which stores a predetermined coefficient of color temperature; and a controller which controls the image processing unit to convert the input image signal to an image signal of a first data bit bigger than the initial data bit and to multiply the image signal of the first data bit by the color temperature coefficient.

Claims

1. A display apparatus comprising:

a display unit;

an image processing unit which processes an input image signal of an initial data bit and provides the processed input image signal to the display unit;

a storage unit which stores a coefficient of color temperature; and

a controller which obtains an average picture level of the input image signal, and controls the image processing unit to convert the input image signal to an image signal of a first data bit larger than the initial data bit, to multiply the image signal of the first data bit by the color temperature coefficient, and to further multiply the image signal of the first data bit by the obtained average picture level,

wherein the controller controls the image processing unit to convert the image signal of the first data bit to an image signal of a second data bit smaller than the first data bit while noise shaping the image signal of the first data bit by adjusting brightness values of the image signal of the first data bit.

2. The display apparatus according to claim 1, wherein the image processing unit comprises a final brightness determining unit which determines a final brightness outputted in the display unit corresponding to the image signal of the second data bit.

3. The display apparatus according to claim 1, wherein the image processing unit further comprises an inverse gamma compensating unit which converts a gamma characteristic of the input image signal to a linear form.

4. The display apparatus according to claim 1, further comprising a user input unit, wherein the color temperature is inputted through the user input unit.

5. The display apparatus according to claim 1, wherein the display unit comprises a plasma display panel.

6. The display apparatus according to claim 1, wherein the initial data bit is x bits and the first data bit is y bits, and y is greater than x.

7. A control method of a display apparatus, comprising:

converting an input image signal of an initial data bit to an image signal of a first data bit larger than the initial data bit;

obtaining an average picture level of the input image signal;

multiplying the image signal of the first data bit by a coefficient of color temperature and further multiplying the image signal of the first data bit by the obtained average picture level, and

converting the image signal of the first data bit to an image signal of a second data bit smaller than the first data bit while noise shaping the image signal of the first data bit by adjusting brightness values of the image signal of the first data bit.

8. The control method of the display apparatus according to claim 7, further comprising:

determining a final brightness corresponding to the image signal of the second data bit.

9. The control method of the display apparatus according to claim 7, further comprising:

converting a gamma characteristic of the input image signal to a linear form.

10. The control method of the display apparatus according to claim 7, wherein the color temperature is inputted by a user.

11. The control method of the display apparatus according to claim 7, wherein the initial data bit is x bits and the first data bit is y bits, and y is greater than x.