Two Trees Photonics - Developing a real time full colour head up display (HUD) using highly efficient phase only holographic display technology

汽车和其他车辆上的抬头显示器（hud）正变得越来越普遍，并且已被证明可以通过让驾驶员盯着道路来显著降低事故率。传统的汽车HUD投影系统是用白色或彩色led照明的lcd。这些系统在亮度、对比度、功耗、尺寸和颜色变化方面受到限制。这些系统对光的利用效率特别低，只有1-2%的光学效率。下一代汽车硬盘的要求非常苛刻，特别是在亮度、调光范围、供电功率和尺寸方面。全息显示器在这些领域提供了各种各样的优势。Two Trees Photonics已经展示了一个非常高质量的HUD使用其高度创新和专利的相位全息与一个真正的模拟相位调制器。这种方法非常有效地从低功率硅芯片激光器创建亮度为26,000Cd/m2的hud图像，但目前仅限于可以使用2种颜色（红色和绿色）创建的图像，并且只能存储有限数量的预计算全息图。为了提供HUD显示能力的阶跃变化并满足汽车oem的要求，该项目旨在将该技术转移到全彩实时全息显示引擎上，从而创建高效的相位全息激光HUD。两树光电在全息显示和光学系统方面具有世界领先的技术能力。该项目将开发包括RGB激光光引擎、高速相位调制驱动引擎、实时计算引擎和相位调制器驱动引擎在内的组件，以提供HUD系统的完整工作原型。这些项目最初集中在汽车领域，但在航空航天、医疗、铁路、船舶、近眼设备和增强现实领域也有机会。

Head up displays (HUDs) in cars and other vehicles are becoming increasingly common andhave been shown to significantly reduce accident rates by keeping the drivers eyes on theroads. Conventional automotive HUD projection systems are LCDs illuminated with white orcolour LEDs. These systems are limited in brightness, contrast, power usage, size and colourvariation. These systems are particularly ineffiecient in their usage of light, 1-2% opticallyefficient. The next generation requirements for automotive HUDs are very demandingespecially in terms of brightness, dimming range, supplied power and size. HolographicHUDs provide a variety of advantages in each of these areas. Two Trees Photonics havedemonstrated a very high quality HUD using its highly innovative and patented phase onlyholography with a truly analogue phase modulator. This approach is very efficient creatingHUD images with a brightness of 26,000Cd/m2 from low power silicon chip lasers but iscurrently limited to images that can be created using 2 colours (red and Green) and is onlyable to store a limited number of pre-computed holograms. To provide a step change in HUDdisplay capability and meet the requirements of the automotive OEMs the project aims tomove the technology to a full colour real time holographic display engine creating highlyefficient phase only holographic laser HUD. Two Trees Photonics has significant worldleading technical capability with holographic display and optical systems. The project willdevelop the components including the RGB laser light engine, the high speed driver enginefor phase modulation, the development of the real time computation engine and the phasemodulator driving engine to provide a full working prototype of the HUD system. The projectis intially focused on automotive but provides opportunities in aerospace, medical, rail,marine, near eye devies and augmented reality.