Touch Function

Touch Function

Dec 09, 2017

In the 2D display, touch technology has greatly improved the human-computer interaction experience, so researchers and manufacturers want to expand their touch capabilities to the 3D display.

In recent years, a number of somatosensory interaction systems based on attitude recognition have been developed, such as the Kinect developed by Microsoft or the Leap motion developed by Leap. These somatosensory interaction systems have been applied to human-computer interaction and games.

However, when the system of somatosensory interaction is applied to the touch of the 3D display, there will be a problem that the interactive system separates the display content from the user space. Therefore we need to develop new technology, which enables users to interact directly with the air of real or virtual image, the touch technology also called air touch technology.

Guo-Zhen Wang and others make use of the embedded optical sensor array of mobile electronic devices and two infrared angle scanning devices to realize the air touch of the 3D image. The optical sensor array is embedded on the thin film transistor (TFT) array substrate, and the optical sensor array is not covered by the black matrix on the color film substrate. Among them, when there is touch operation, the infrared light source passing through the TFT array substrate and irradiated to the fingers will be reflected to the optical sensor embedded on the TFT array substrate, and then the position of fingers on the plane parallel to the array substrate (x, y) can be calculated.

As shown in Figure 16 (a). The two infrared angle scanning devices can calculate the distance of the finger distance to the display screen by the scanning angle, as shown in Figure 16 (b), Z. Therefore, the position of the finger in the 3D space can be obtained, and then the air touch of the 3D image can be realized. MASAHIRO YAMAGUCHI and others use color sensors to realize the air touch of the 3D image. As shown in Figure 17, the color sensor is placed behind the display screen. When human-machine interaction is needed, the 3D display system displays buttons of different colors in the predetermined position, and when the finger touch button, the corresponding color will be scattered to the color sensor. The color sensor can determine the touch button of the finger through the color, and then realize the air touch.

However, the touch control system can not touch the area without a predetermined button.



The 3D image can provide more information, including depth information, and a better sense of presence for the observer. Therefore, the moderate price 3D display has an important application in the fields of medical, entertainment, military, education and other fields.

True three-dimensional display technology can achieve more real 3D images, and it is also the ultimate goal of human being in the field of display technology.

However, the technology of real 3D display technology is very difficult and complex, and the practical application and popularization still need to solve a large number of technical problems. Assisted stereoscopic display technology is the first and widely promoted stereoscopic display technology. However, the discomfort caused by glasses or helmets will make the market of assisted stereoscopic display technology gradually occupied by other stereoscopic display technologies including autostereoscopic display technology.

The automatic stereoscopic display technology has a mutual restriction between the natural resolution and the number of views. In order to solve these problems, the researchers improve the resolution and the number of view from the display panel design, backlight design and projector.

In order to obtain the 3D image more natural and traditional auto stereoscopic display visual fatigue and other issues caused by the technology, researchers have proposed a super multi view display technology, to ease the conflict and convergence - focus adjustment smooth motion parallax. In order to touch the 3D image directly, the researchers put forward a variety of technical solutions to realize the air touch.

In addition, in order to solve the problem of the lack of existing 3D content, the researchers also realized the compatibility of 2D and 3D by introducing handover liquid crystal layer.