Projected Touch Screen

Product Description

The 21.5 inch Projected Touch Screen panel with ILITEK touch controller ic can support operation with thick gloves ,thick tempered glass and thick PC on the top, mainly used in industrial, medical, outdoor advertising and other equipment. Deep customization including structural, surface treatment such as AG AR AF and other special effects are supported; All kinds if interface conversion Boards and drive Boards are provided to meet requirements from various customers.

Technical Q&A

Q: What are the suggestions on the anti-ESD performance of capacitive touch screen to match customers end products? 

A: On the one hand, enhancing the anti-ESD capability of IC , on the other hand, to achieve the best defense of TP against ESD. multiple ESD defenses should not be a problem. If the space is really limited, the standard can be appropriately reduced, and the anti-ESD capability is more determined by the whole machine structure. It is recommended that the FPC increase the 2k string resistance or add the relevant skin filter circuit and the TVs tube. Regarding the problem of static electricity, we must first understand the fact that the system ESD is different from the IC ESD. System ESD is mainly guaranteed by system design. The enhancement of IC ESD is only one aspect of system ESD enhancement. Therefore, even if the ESD of the IC is enhanced, the design of the screen body still requires ESD treatment to ensure the requirements of the system ESD. For system ESD, the most important thing is the mechanism design. If the mechanism is well designed and the energy that is coupled to the screen body is small, the ESD Design of the screen body can be relaxed. 

Q: What are the strategies for ESD in EMC testing of complete end products? 

A: the overall solution is to flow static electricity to the ground. There are roughly the following suggestions: 1), power supply plus TVs Tube: for ESD protection of power supply VCC, TVs tube can be connected and solved. The TVs tube is very similar to the voltage regulator diode. It has a rated voltage. The difference is that its response speed is particularly fast and it has a good discharge effect on static electricity. 2) ESD protection of the external interface signal line: you can consider and connect the reverse diode to guide the current to the power supply or ground; 3), LC filtering is added to the power supply of sensitive devices: Some IC is particularly susceptible to static electricity. When ESD tests are carried out, reset or death always occurs. The reason is that the power supply pin is usually disturbed. For this, LC filtering can be added to its power supply. 4) PCB paving requirements: PCB should be paved as much as possible. If it is a double panel, both sides should be paved with copper in a large area, and there should be enough ground holes. If it is a four-layer board or above, the adjacent plane layer of the main component layer should be set to a formation. 5) grounding requirements: to effectively release static electricity, a good grounding must be guaranteed. For example, medical electronics, general medical electronic products such as monitors, there will be an equal potential grounding end behind the fuselage. When doing ESD tests, this grounding end is also connected to the Earth, so there is a way to quickly discharge static electricity. 6) PCB layout wiring: If the decoupling capacitor of the chip is far away from the pin of the chip, the decoupling effect will be lost. If the line of sensitive signals is too long, unexpected electromagnetic interference will be introduced. In terms of anti-ESD, sensitive devices or signal lines (such as reset) should be kept away from the edge of the PCB to prevent air discharge from interfering directly with the devices and signal lines. The PCB edge should have a certain width of the gap or copper.

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