Method for adjusting pixel data based on the duty ratio history of the backlight in order to compensate for the temperature of the backlight

A light source device comprising:

• a light source module including a light-emitting block;
• a duty ratio determination part which determines duty ratio data by using representative luminance data of the light-emitting block based on pixel data;
• a fixed duty ratio extracting part which extracts fixed duty ratio data based on the duty ratio data from a first period;
• a fixed luminance calculation part which calculates fixed luminance data corresponding to a temperature of the light-emitting block based on the fixed duty ratio data;
• 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 fixed luminance calculation part includes a storage part which stores luminance data corresponding to duty ratio data sampled from measured fixed duty ratio data, and
• the fixed luminance calculation part calculates the fixed luminance data by linear interpolation of the measured fixed duty ratio data.

A display apparatus comprising:

• a display panel which displays an image;
• a light source module including a light-emitting block and which provides the display panel with light;
• a light source driving device which extracts fixed duty ratio data based on duty ratio data of the light-emitting block from a first period, and which calculates fixed luminance data of the light-emitting block by using the duty ratio data and the fixed duty ratio data, the light source driving device configured to drive the light-emitting block by using a driving signal having a duty ratio corresponding to the duty ratio data;
• a compensation part which generates a compensated pixel data of an image block corresponding to the light-emitting block based on the fixed luminance data;
• and
• a panel driving part which drives the display panel using the compensated pixel data,
• wherein the fixed luminance calculation part includes a storage part which stores the luminance data corresponding to duty ratio data sampled from measured fixed duty ratio data, and
• the fixed luminance calculation part calculates the fixed luminance data by linear interpolation of the measure fixed duty ratio data.