基于区域调光的高动态范围激光显示

High Dynamic Range Laser Display Based on Local Dimming

高动态范围(HDR)激光显示一方面可以显示接近人眼动态范围的高对比度场景,另一方面可以最大化显示色域,是下一代显示技术的重要发展方向。为了实现高亮度、高效率、低成本的HDR激光显示,提出了一种基于区域调光的HDR激光显示架构,即模块化的激光光源通过光纤阵列的方式拼接出一个阵列照明光场,在图像显示时,每个激光器会根据画面各个区域的亮度来动态控制发光强度,而空间光调制器会根据动态的照明光场和要显示的图像内容进行相应的像素调制。另外,针对激光器波长差异导致的显示色差,提出了一种消除激光色差的区域调光算法,其主要原理是,激光器调制光强输出后,空间光调制器上的每一个像素点均根据该处混合照明光的三基色色坐标计算出对应的调制值,进而实现HDR图像的无色差显示。

On one hand,high dynamic range(HDR)laser display can show high contrast ratio scenery that is close to the dynamic range of the human eye.Moreover,it can also improve the color gamut of the display.Consequently,it is an important development direction for next generation display technologies.This study proposes a novel architecture based on local dimming technology to achieve a high-brightness,high-efficiency,and low-cost HDR laser display.Using an optical fiber array,the laser source modules output an array light field to the spatial light modulator(SLM).When displaying an image,each laser will dynamically control its brightness based on the grayscale value of its corresponding image area,and the SLM will modulate the pixels based on the dynamic light field and the source image.Furthermore,this study presents a local dimming algorithm that can eliminate the chromatic aberration caused by the laser wavelength difference.The main principle is that the modulating value of each pixel on the SLM is calculated based on the color coordinates of a mixed three-primary illuminating light.This algorithm enables the display of HDR images without chromatic aberration.