LED Tech: Fine Pitch Technology & Capacitive Touch Screens

    The LED technology has moved so fast that the entire media world has become dependent on it. The main reason as to why this has transpired is because LEDs are not like previous conventional media formats as they have a lot more to offer. The fact that LED displays have been created similar to LEGO bricks allow them to be used in a multitude of ways featuring distinct and unique configurations. The technology behind LEDs moved so rapidly mainly since they are energy efficient, produce less heat and last much longer than most other lights and display types. The fact that these screens can be ‘fitted together’ in a million different ways is another reason as to why they have become so immensely popular. From invisible LED displays that have a transparency rate of above 90 % too soft LED screens that could be wrapped around curves,

    columns and arches (LED arch), right up to interactive screens and displays that can cover the façade of entire buildings, they have it all!. Most LED media systems that are offered by industry leaders such as Street Communication are exceedingly robust based on the fact that some of these systems could be immersed under three meters of water. They are dustproof, shockproof, moisture-proof, UV resistant (for outdoor units) and come at various resolutions depending on pixel pitch sizes. This article aims to explain the elements of fine pitch technology that delivers high resolution (pixel pitch sizes) in 4K and also introduce the mechanics behind the capacitive touch screens (touch sensor displays) which use the conductive touch of our fingers or unique input devices.

    Resolution & Fine Pitch Technology

    The arrival of various types of fine pixel pitch among LED screens especially within the realm of the digital signage market has created a significant level of confusion with regards to differentiating these LED products. According to the tech wizards at leading LED solution providers such as Street Communication, the emphasis should be given to pixel pitch size more than anything else. According to Street Communication, the selection of the screen resolution should be essentially based on ‘viewing distance’. The idea is that the closer the viewing distance, the higher the resolution should be and the smaller the pixel pitch size based on FPT or Fine Pitch Technology for LED screens.

    The importance of pixel pitch size can never be undermined mainly because it has a direct impact on the optimal viewing distance for the media display which in turn becomes a critical factor with regards to where the display is located. In essence lower pixel pitch values attain smoother borders and outputs finer details. This, in turn, enables viewers to get much closer to the screen and be able to enjoy better and undistorted images. To put it simply, a 1.2mm pixel pitch size screen will project higher resolutions for closer viewing compared to a screen that has 16mm pixel pitch size. However, according to those at Street Communication, even though higher pixel density delivers Full High Definition or FHD giving viewers enhanced visual quality,

    it is not ideal for all situations. Additional pixel density is intended for a closer viewing distance. This is because, from greater viewing distances, screens with higher pixel density or fine pitch resolution lose visual advantages quite significantly not to mention that they cost much more. It is due to this that most interactive touch solutions screens are generally rendered with low pixel pitch sizes to project crisp images for the audience. These interactive LED display screens also come in a wide variety which can sense input from human fingers or basic and simple styluses which are generally referred to as capacitive touch screen panels.

    Touch Capacitive Screens

    capacitive touch screens

    Touch capacitive screens are as they say ‘all the rage’ in the media world. These LED display screens are called ‘touch-capacitive’ simply because they require to be touched with a special capacitive element or a finger. How this works is by coating the panel with materials that can store electrical charges at the precise location of the touch on the display screen which sends a signal to the processor due to the change in capacitance at the ‘touch coordinates’. Towards explaining the mechanics further, when a touch-capacitive panel is touched by either an instrument or a finger, what transpires is; a minute amount of electrical charge is attracted to the point of contact which turns into a functional capacitor.

    This causes a change in the electrostatic field triggering a response from the processor based on the execution command that is written for that point of location. Most of these interactive touch sensor displays are normally multi-touch screens which mean that the sensors are arranged into a grid that allows complex inputs. This is unlike resistive touch screens that function based on applied pressure that causes two conductive layers pressed together. Touch capacitive screens are rapidly replacing resistive touch screens mainly because they provide higher clarity levels coupled with easier functions due to greater accuracy and lighter contact.

    Wrap

    In summary, touch capacitive screens are generally coupled with high pitch technology, highly durable and are convenient for a variety of functions which include the large screen display modules that are convenient for meeting rooms (adapted for indoor environments). Although these LED writing screens, Touch sensor displays, or Led touch capacitive screen as some may call it are mainly for indoor applications, these interactive large LED display screens are made to have a good level of durability due to their waterproof, dustproof and bump proof or shockproof features. The writing functions of these modules allow users to type directly on the screen (Mirror-cast function) at 4k resolution thanks to fine pitch technology. It has become evident that LED technology is not letting up although it has progressed too far and too fast and it seems that the industry leaders have a lot more in store for the market which has yet to be seen.

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