The topic of "car head up display (HUD) in the future" sounds like a lot of technical vocabulary at first glance, but it will have great potential in the next few years. According to HIS Automotive forecast, the global scope, pre installed HUD car sales will increase from 1.2 million in 2012 to 9.1 million in 2020, that does not contain the number of consumer solutions to its existing vehicles after loading HUD.
If you are a developer or automotive original equipment manufacturer (OEM), then you may lead HUD into the next vehicle -- either integrated or installed after the solution of what precautions and quite bother. Developers need to consider a number of factors in the construction of different products, including FOV and image quality.
AR is the key to promote the future development of HUD (augmented reality). First of all, we want to define the definition of AR here - although the current market for AR can be described as different opinions, but for how AR will affect the future of the car shows a relatively consistent view.
If you put the real world on one side and place the virtual reality (VR) on the other side, AR is located in the middle of the two extremes. In the vehicle, AR covers the digital image in the real world we see, thus enhancing the computational intelligence of the driver's line of sight.
In other words, the AR HUD makes the windshield the focus of all relevant data such as speed and road hazards, while ensuring that the driver is always focused on the road ahead. Although there is still controversy about which data to display and when to display the data, but there are already some of the industry in the design of AR HUD recognized the need to pay attention to the technical points.
Visual field (FOV) and virtual image distance
The visual field may be the most important aspect of any HUD, especially for AR HUD, because it directly affects the size of the image the driver sees. Currently, Using DLP technology to achieve the widest FOV can make up the OEM projection angle of 12 degrees - this is twice as the industry can achieve the value before.
Virtual image distance controls the projection distance of a image and the distance between image and driver. This is especially important when the speed is high, because it is better to indicate the risk of road surface. The current use of DLP chip HUD design can be projected into the image of the driver in the range of 2 meters to 20 meters in front of the driver.
One thing to note is that in this case, the image quality is not necessarily equivalent to higher resolution. Image quality involves image refresh rate, color depth, brightness and other variables. It is very challenging to control the quality of the image in such a chaotic and unpredictable outdoor environment. Day and night the changing light intensity means the accuracy of any car AR HUD solutions must be able to keep the color depth and color, and consistent with the high contrast, so that in a wide range of work under normal driving conditions.
For example, our DLP3000-Q1 chipset with car rules, it includes the DLP 0.3 inch WVGA digital micromirror device (DMD) and special DLPC120 digital controller, 400000 quick switch programmable micro mirror, so as to achieve the number of milliseconds high refresh rate and enhanced image quality. DLP technology can be used in any light source, so that developers can flexibly use the traditional incandescent lamp, or halogen light source, LED, and even laser.
Most car AR HUD solutions require developers to collaborate in the design of a solution to meet the needs of their products and customers. As we mentioned before, the HUD solution is usually a part of an integrated solution, and this solution has advanced driver assistance system (ADAS) and other components of concentrated work, to provide a better driving experience.