DISPLAY DRIVING DEVICE AND DRIVING METHOD OF ADJUSTING BRIGHTNESS OF IMAGE BASED ON AMBIENT ILLUMINATION

The invention provides a display driving device and a driving method of adjusting brightness of an image based on ambient illumination. A display driving device, which adjusts a brightness of an imageon the basis of an ambient illumination even without an increase in amount of power consumption, includes a controller determining a clipping ratio for clipping input image data by using an ambient illumination value when the ambient illumination value is input thereto, a gain calculator calculating a frame gain which is to be applied to the input image data, based on the clipping ratio, an inputimage clipping unit clipping the input image data by applying the frame gain in the input image data, and a gamma converter gamma-converting clipped input image data to generate output image data. 基于周围照度调整图像亮度的显示驱动装置及驱动方法。一种即使在不增加功耗量的情况下也能以周围照度为基础来调整图像亮度的显示驱动装置包括：控制器，其在被输入周围照度值时通过使用周围照度值来确定用于剪切输入图像数据的剪切比；增益计算器，其基于剪切比来计算要应用于输入图像数据的帧增益；输入图像剪切单元，其通过将帧增益应用于输入图像数据中来剪切输入图像数据；以及伽马转换器，其对经剪切的输入图像数据进行伽马转换以生成输出图像数据。