What role does LED play in human-computer interaction?

- Feb 21, 2019 -

 


     In recent years, with the popularity of smartphones and tablets, human-computer interaction has become a high-frequency vocabulary. So, what role does LED play in the technological change of human-computer interaction?

     For a long time, the traditional large LED screen is "one-way transmission" to the audience. In recent years, with the development of new technology, the screen is no longer confined to "single arrow propagation" between people, but to "intelligent interaction". At present, the main ways of human-computer interaction are screen-net interaction, touch interaction, and other technologies (such as somatosensory technology, augmented reality, face recognition, etc.).

     Screen-net linkage. With the advent of the "Internet plus" era, some of the industry's most responsive people are aware of the trend of convergence between traditional media and new media, and timely integration of new media with technology success. "Networked controlled broadcast" is a way of development that combines the large LED screen with the internet. It uses the ports of mobile phones, PC, computers and other ports to operate on the internet, and combines the popular two-dimensional code, APP and other functions to realize the joint interaction between the large LED screen and the audience, stimulate the growth of the audience's interest, and enhance the audience's participation.

     Carried touch technology. At present, LED display screen can realize direct "human-screen interaction" by carrying "touch technology (sensor)", such as interactive LED floor tile screen, touch screen and so on. Among them, the performance of LED floor tile screen in the field of interaction is very prominent, especially in the stage, its performance is very eye-catching. The LED touch screen is mostly used in the field of close-range display, and the requirement for the display effect of the products is more stringent. In order to meet the needs of close-range display, manufacturers combine the LED touch screen with small-distance technology, which can not only realize intelligent interaction, but also enhance the user experience.

LED floor tile screen

     Other interactive technologies. At present, LED large screen interaction has become the trend of the whole industry. LED large screen interaction can be achieved by absorbing the cutting-edge technologies such as somatosensory technology, augmented reality technology, face recognition technology and so on. Throughout the VR market, VR products and LED screens are inseparable. Moreover, from the point of view of VR industry chain, LED display screen is the most basic and important hardware facility. The LED display screen with better picture quality effect can undoubtedly significantly improve the user experience of VR products.

     LED Ring, LED Matrix and LED Lighting Interactive Interface

     Today's products become very intelligent and interconnected. Devices such as speakers, televisions, refrigerators, set-top boxes and smoke detectors are no longer just tools in a certain location - users can control them remotely or through voice wake-up. These devices are smarter than ever, which means they also need smarter human-computer interfaces.

  The interface of human-computer interaction can be varied. LED rings, LED matrix or RGB LED lighting, which are formed by various creative combinations of light emitting diodes (LEDs), are the hottest human-computer interaction methods nowadays, especially by changing such as chasing or flickering.

     An Example of LED Used in Human-Computer Interactive Interface





The influence of LED driver on human-machine interface design

     To have an extremely friendly human-computer interface, these elements are important:

     Perfect color mixing, color changes according to user requirements

     Suitable LED brightness: Don't be too dark in the daytime and not too bright at night

     Beautiful dynamic effects, such as chasing or flickering

     When the power source comes from the battery, it can also achieve consistent brightness display and high efficiency.

     Although at first glance this list is impossible to start with, in fact, only a good LED driver can be easily implemented. This LED driver needs the following functions:

     Be able to use appropriate communication protocols, such as I2C, to drive multiple channels. Microcontroller (MCU) can communicate with the device and control each channel independently without consuming a large amount of general input/output GPIO pin resources.

     High Resolution Pulse Width Modulation (PWM) control is used to change the brightness of the LED without too much step change in visual perception.

     Very low static current and suitable power saving mode.

     High frequency pulse width modulation (PWM) signals can avoid discernible noise from the human ear, because many LED indicators are used with speakers.

     These devices integrate a 12-bit PWM generator. Its working frequency is higher than that of human distinguishable noise. The frequency of each channel is 29 kHz. It can achieve stable and accurate color bending control and zero noise. Each channel provides independent color mixing and brightness control. Through the integrated power-saving mode, these LED drivers can significantly reduce power consumption, thereby improving the overall system efficiency in standby mode.