Method of preventing the temperature of a backlight source from remaining at a low temperature based on the duty ratio history of the backlight

1. A light source device comprising:

a light source module divided into a plurality of light-emitting blocks, which are individually operated;

an image analysis part which extracts representative luminance data of a light-emitting block of the plurality of light-emitting blocks based on pixel data corresponding to the light-emitting block;

a duty ratio calculation part which calculates duty ratio data of the light-emitting block based on the representative luminance data;

a duty ratio storage part which stores duty ratio data;

a duty ratio determination part which generates determined duty ratio data of the light-emitting block based on the duty ratio data calculated from the duty ratio calculation part and the duty ratio data stored in the duty ratio storage part during a first period corresponding to a plurality of frames; and

a signal generation part which generates a driving signal having a duty ratio corresponding to the determined duty ratio data to drive the light-emitting block,

wherein the determined duty ratio data is a predetermined high duty ratio applied to the light-emitting block during a second period corresponding to a plurality of frames, when the duty ratio data of the light-emitting block is less than a predetermined value during the first period.

2. The light source device of claim 1 , wherein the determined duty ratio data is the duty ratio data of the light-emitting block when the duty ratio data of the light-emitting block is greater than or equal to the predetermined value during the first period.

3. The light source device of claim 1 , wherein the duty ratio corresponding to the determined duty ratio data to drive the light-emitting block at a moderate temperature is in a range of about 10% to about 50%.

4. A display apparatus comprising:

a display panel which displays an image;

a light source module divided into a plurality of light-emitting blocks, which are individually operated, the light source module providing the display panel with light;

a light source driving device which calculates duty ratio data of the light-emitting block based on pixel data, the light source driving device configured to generate determined duty ratio data based on the duty ratio data calculated from a duty ratio calculation part and the duty ratio data stored in a duty ratio storage part during a first period corresponding to a plurality of frames, and configured to drive the light-emitting block by supplying a driving signal having a duty ratio corresponding to the determined duty ratio data;

a compensation part which receives the driving signal from the light source driving device and generates compensated pixel data by compensating the pixel data of an image block corresponding to the light-emitting block based on the driving signal having the duty ratio corresponding to the determined duty ratio data; and

a panel driving part which drives the display panel based on the compensated pixel data,

wherein the determined duty ratio data is a predetermined high duty ratio applied to the light-emitting block during second period corresponding to a plurality of frames, when the duty ratio data of the light-emitting block is less than a predetermined value during the first period.

5. The display apparatus of claim 4 , wherein the light source driving device comprises:

an image analysis part which extracts representative luminance data of the light-emitting block based on the pixel data;

a duty ratio determination part which generates the determined duty ratio data of the light-emitting block based on the duty ratio data calculated from the duty ratio calculation part and the duty ratio data stored in the duty ratio storage part during the first period; and

a signal generation part which generates the driving signal having the duty ratio corresponding to the determined duty ratio data to drive the light-emitting block.

6. The display apparatus of claim 5 , wherein

the compensation part generates the compensated pixel data using the predetermined high duty ratio of the predetermined duty ratio data.

7. The display apparatus of claim 6 , wherein the predetermined duty ratio data is the duty ratio data of the light-emitting block when the duty ratio data of the light-emitting block is greater than or equal to the predetermined value during the first period, and

the compensation part generates the compensated pixel data using the duty ratio data of the light-emitting block.

8. The display apparatus of claim 4 , wherein the duty ratio corresponding to the determined duty ratio data to drive the light-emitting block at a moderate temperature is in a range of about 10% to about 50%.

9. A method of driving a light source device including a light source module divided into a plurality of light-emitting blocks, which are individually operated, the method comprising:

extracting representative luminance data of a light-emitting block of the plurality of light-emitting blocks by using pixel data corresponding to the light-emitting block;

calculating duty ratio data of the light-emitting block by using the representative luminance data;

generating a determined duty ratio of the light-emitting block based on the duty ratio data calculated from the duty ratio calculation part and the duty ratio data stored in a duty ratio storage part during a first period corresponding to a plurality of frames;

generating a driving signal having a duty ratio corresponding to the determined duty ratio data; and

driving the light-emitting block using the driving signal,

wherein said generating the determined duty ratio data comprises:

determining whether the duty ratio data is less than a predetermined value during the first period; and

generating the determined duty ratio data as a high duty ratio for the light-emitting block during a second period corresponding to a plurality of frames, subsequent to the first period, when the duty ratio data is less than the predetermined value during the first period.

10. The method of claim 9 , wherein said generating the determined duty ratio data further comprises generating the determined duty ratio data as duty ratio data when the duty ratio data is greater than or equal to the predetermined value during the first period.

11. The method of claim 9 , wherein the duty ratio corresponding to the determined duty ratio data to drive the light-emitting block at a moderate temperature is in a range of about 10% to about 50%.