CDS offers LCD Panel Kits and Touch Solutions from stock which include Display panels with interface card and Control OSD and Cable-Set, including Embedded Touch Displays and Touch Screen Components. The CDS kit solutions include a display and the driving electronics such as AD board and backlight drivers all in one package optimised for the panel of your choice. Many of the CDS displays are configured with a controller card, and internal cable sets with each of these combinations set up as an LCD display kit which ensures a single part number can be ordered at any time and our customers are guaranteed consistency of supply.
But some of our customers require TFT display kits that are slightly different to a standard kit, with for example a different firmware. For these unique part numbers are created for each customers TFT display kit solution, again ensuring that traceability and consistency is guaranteed within each and every one of our TFT display kits. This could also include the different ways the internal components are handled, e.g. a medical or military company may require 100% incoming testing rather than batch testing and a unique part will identify this requirement and ISO procedures ensure the process and reliability. Applications include touch screen kiosk , touch window, industrial touch screen, industrial touchscreen monitor, touch screen tv.
Whatever your display kit solution we can deliver this for you at a very cost effective price. Just contact our technical sales team to discuss your requirements and they will create an optimised solution for you. Even if you are having issues with your current supplier we can often offer lower cost Form Fit and Function solutions to give you that improved performance and solution you require.
Interactive flat panel displays (IFPDs) with infrared touch screens are gaining popularity in recent years.
Compared with smart projector boards, which were widely applied to education, IFPDs is more convenient and practical.
You do not need to calibrate the image projector before lecturing; with LED lighting technology, IFPDs provide a clear image all the way; and thanks to the IR touchscreen, you can annotate your presentation with almost anything, a dry/wet finger, pen, or stylus.
However, lets focus on the IR touchscreen today to see how it is properly utilized to improve the user experience.
An infrared touch screen consists of an LCD monitor, IR touch frame, and infrared touch overlay.
Commonly, the overlay is a piece of protective glass hemmed in by the IR touch frame, in which Infrared LEDs and photodetectors are embedded. A kind of optical bezel will be inserted between the glass and the frame to fix the frame and transmit infrared light emitted by those LEDs.
Through the optical bezel, IR LEDs emit invisible infrared beams forming grids on the surface of the overlay, Photodetectors are installed across from the LEDs to detect interruptions of beams if touch events on the overlay happen.
Figure 1. IR Touch Screen StructureThe infrared touchscreen works by detecting interruptions of infrared beams emitted by LEDs embedded in the frame around the touchscreen overlay.
There are two rows of IR LEDs, which generate horizontal and vertical invisible IR beams. They form a large beam grid that covers the surface of the overlay. In the meantime, two rows of photoreceptors are installed on the opposite side of the LEDs.
As long as an opaque object touches the surface, it will blot out the light beams. Photoreceptors in both directions (vertical and horizontal) can detect this interruption by that object, finally localize the x and y coordinates, and then send the signal to the processor to respond with relevant action.
Figure 2. The Mechanism of IR TouchscreenTo know more details of its structure and workings, youd better walk into a workshop to learn its assemble process. Most of the time, we do not have that chance, however, regular maintenance work offers you the opportunity to check its components inside.
Lets review the video below.
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Maintenance is a good solution to sustain the equipment with an IR touchscreen, however, it entails cleaning and installing the interface (overlay).
Alternatively, Lets go through this video to learn more
Besides IR touch, resistive touch and capacitive touch in todays market are also mature technology, which performs stably.
Resistive or capacitive touch screen technology exists even longer than IR touch screens.
But, why do engineers choose infrared touch screens for interactive whiteboards, which are widely used for business meetings and distance learning.
Of touch screen technologies, infrared and projected capacitive are the top two types that are mostly utilized. However, they are applied to different applications due to the differences between them.
For PCAP touch screens, There is a layer of transparent electrode film that is fixed between the LCD panel and the cover glass, when the human finger touches the screen, the current through that film changes, and the signal of x and y position will be transferred to the computer.
For IR touch screens, the equipment detects the fingers position by detecting the block of invisible lights from the infrared LEDs that are embedded in the touchscreen frames.
So you will often see a bezel in the IR touchscreen, which is used to transfer the infrared light to the surface of the overlay, while the PCAP touchscreen does not require the bezels.
Figure 3. Capacitive Touch ScreenPCAP touch screen only supports two-point input, while IR ones up to 40-point input.
IR touchscreen can be activated by anything that is not transparent, whereas PCAP types only accept bare fingers, thin surgical gloves, or cotton gloves.
The electrode film in PCAP touchscreens is expensive, especially when it comes to large screens, but for IR ones, when it is applied to large-scale screens, you only need to add a few LEDs and correspondent detectors, apparently, the IR touchscreen solution is more cost-effective in large interactive displays, such as the interactive digital board, which are used for presentation in business meetings.
Due to the costs and multi-touch function, the IR touch screen is mostly applied to large screens, however, PCAP is used in smartphones and tablets.
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