English
At a time when digital office and intelligent display are becoming increasingly popular, LCD all-in-one PCs are widely used in education, business, office and other fields by virtue of their integrated and convenient features. Essentially, the LCD all-in-one machine is the LCD monitor and computer host, sound system and other functions integrated into one device. Behind it contains a number of core technologies, from the display panel to various types of interfaces, each part of the device plays a key role in performance. Next, we will analyse these core technologies, to open the mystery of the LCD all-in-one machine.
First, the display panel technology
LCD panel is the core component of the LCD all-in-one machine, its quality directly determines the display effect. Currently on the market mainstream LCD panels are TN, IPS and VA three types.
TN (Twisted Nematic, Twisted Nematic) panel response speed, can effectively reduce the dynamic image of the phenomenon of shadow, suitable for the response speed of the high requirements of the gaming, gaming scenes. However, its colour performance and viewing angle are relatively poor, and when viewed from the side, the screen is prone to colour deviation and brightness attenuation.
IPS (In - Plane Switching) panels are known for their excellent colour performance and wide viewing angles. Its accurate colour reproduction and ability to present rich colour gradations, as well as the fact that the colour and brightness of the screen hardly changes even when viewed from a wide angle, make it a popular choice for education, commercial displays and other fields. When teachers walk around the classroom to explain, students can clearly see the screen content no matter from which direction; when businessmen display their products, customers can also appreciate the accurate colour of the screen from different angles.
VA (Vertical Alignment) panels are excellent in terms of contrast, able to show deep black and bright white, bringing more impactful visual effects, commonly used in home theatre, high-end commercial display and other scenarios with high requirements for picture quality.
In addition, the resolution of the panel is also an important factor affecting the display effect. Common resolutions are 1920×1080 (FHD, Full HD), 3840×2160 (UHD, Ultra HD), etc. A higher resolution means that it can present a more detailed and clearer picture to meet the user's demand for a high-quality visual experience.
Second, the backlight technology
LCD panel itself does not emit light, you need a backlight to provide light. Early LCD all-in-one mostly used CCFL (cold cathode fluorescent tube) backlight, but it has a high power consumption, large size, contains mercury and other harmful substances and other shortcomings. With the development of technology, LED (light-emitting diode) backlighting has gradually become mainstream.
LED backlighting has the advantages of energy saving, environmental protection, long life and uniform brightness. Meanwhile, according to the arrangement of LEDs, it can be divided into side-entry type and straight-down type. Side-entry backlighting installs LED strips on the side of the panel, and evenly distributes the light to the whole screen through the light guide plate, which can make the body of LCD All-in-One PCs thinner and lighter; straight-down backlighting evenly distributes LED beads at the back of the panel, and directly provides light for the screen, which has a better performance in terms of brightness and contrast control, and can significantly improve screen hierarchy and black performance, especially when realising the function of local dimming. It is better in brightness and contrast control, especially when local dimming function is achieved, it can significantly improve the layering and black performance of the screen.
Third, touch technology
In education and commercial applications, touch control function is an important feature of the LCD all-in-one machine. Common touch technologies include resistive, capacitive, infrared and acoustic wave.
Resistive touch control through pressure sensing to achieve the operation, need to press the screen, suitable for industrial control and other high environmental requirements of the scene, but is not suitable for multi-touch; capacitive touch using the body's electric field sensing principle of work, support for multi-touch, smooth operation, widely used in smart phones and tablet PCs, LCD all-in-one machine is also a large number of use; infrared touch is the installation of infrared in the screen bezel Infrared touch is installed on the screen border infrared transmission and reception devices, through the detection of infrared shade to determine the touch position, it is adaptable to the environment, support for multiple people at the same time touch, commonly used in education interactive classroom and large-scale commercial displays; acoustic touch using the propagation characteristics of the surface acoustic wave to detect the touch, fast response speed, high precision, but easy to be affected by factors such as dust, water vapour and so on.
Fourth, interface technology
Rich and practical interface is the LCD all-in-one to achieve the key to multi-function.Common interfaces include HDMI, VGA, USB, RS-232 and so on.
HDMI interface can simultaneously transmit high-definition video and audio signals, support 4K or even 8K resolution, is connected to computers, game consoles, Blu-ray players and other equipment, the preferred interface; VGA interface is gradually being replaced by HDMI, but in some of the old equipment is still used in the connection; USB interface is used to connect the USB flash drive, removable hard drive, stylus, wireless keypad, and other external devices, to facilitate the transfer of data and equipment expansion; RS - 232 interface is commonly used in the connection of U disk, mobile hard drive, stylus, wireless keypad, etc., convenient data transfer and The RS-232 interface is commonly used for centralised control and remote management of equipment, and plays an important role in the integration of multimedia systems in the education and commercial fields.
LCD all-in-one machine from the display panel to the interface of each core technology, are cohesive with the results of scientific and technological development.These technologies cooperate with each other, and together create the LCD all-in-one machine excellent display effect, convenient operation experience and powerful functionality expandability.
With the continuous progress of technology, the future of the LCD all-in-one machine will play a greater role in more areas, to bring users a more intelligent and efficient experience.
