Product Description
-The Raspbreey Pi 21.5 Inch Touch Screen is available to work well with HDMI and USB owing to the scientific design which is designed with large size as well as good properties, providing the comfortable and wonderful using experience.
-User-friendly, it is convenient to use with easy operation that you can just control the machine by touching the screen. And it is environmentally friendly that it contains no harmful substance, no odor as well as no UV radiation.
-It is endurable with prolonged service life that it can be used over and over again, making it the cost effective one. With the resistance to water, corruption and dust, it is easy to maintain and clean, greatly extending its life circle.
The product can match the applications of all 21.5-inch brands display with 1920*1080 resolutionwith a full view angle, which can match the VGA or HDMI interface driver board, and the capacitive screen USB interface,the product can be connected to Raspbreey Pi by USB and HDMI interface.
-The Raspbreey Pi 21.5 Inch Touch Screen made by our company with high standards is practical which is widely used in daily life, such as the smart appliances, medical equipment, computers and so on.
-It is developed by the authoritative certification of CE and ISO9001 that it has guaranteed quality.
| Model Number | HX2151706 |
| Brand | Grahowlet |
| Size | 21.5 inch |
| Operating Temperature | 0℃ ～ 50℃ |
| Storage Temperature | -10℃ ～ 60℃ |
| Outline Dimension | 510.84(W)x309.85(H)x14.15(D) mm |
| Viewing Area | 477.64(W)x269.11(H) mm |
| Active Area | 476.06(W)x267.79(H) mm |
| Support Systems | Windows/Android/Linux etc. |
| Warranty | 1 year |
| Interface Type | IIC/USB |
| Structure | G+G |
| Controller IC | ILITEK |
| Touch Points | 10 points |
| Transparency | ≥85% |
| Surface Hardness | ≥6H |
| Power Supply Voltage | 2.8V ～ 3.3V |
| Resolution | 1920X1080 |
| Interface Type | LVDS/HDMI/VGA |
| Luminance | 250 cd/m² |
| Viewing Angle | ALL |
Our Advantage
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Cost-effective resource-rich products | Fast Production delivery excellent after-sales service | Stable supply chain long life cycle | Strong technical support short response time | Wide Industry coverage various mature solutions |
Our Company
Hangzhou Grahowlet Technology is a comprehensive service provider of capacitive touch screen module and TFT LCD display for various industries. In order to meet different requirements of worldwide customers, Hongxiao supply all kinds of product structures such as G + G, G + F (G + F + F ),P + G, etc. and various technical support programs such as Cypress , Atmel, EETI, FocalTech, Goodix etc. according to different application environments. We provides solutions that match all customers' touch screen needs and create products based on multiple technologies. We are committed to supply global customers with first-class products and professional technical services in the touch industries. Our products are of high stability and anti-interference performance and used in various industries with complicated and difficult conditions.
Technical Q&A
Q: What is the principle of capacitive touch screen to achieve multi-touch?
A: When the finger touches the capacitive screen, it affects the coupling between the two electrodes near the touch point, thus changing the capacitance between the two electrodes. When detecting the mutual capacitance, the lateral electrodes sequentially emit excitation pulse signals, and all the longitudinal electrodes receive signals at the same time, so that the capacitance values of all the intersections of the lateral and longitudinal electrodes can be obtained, that is, the capacitance of the two-dimensional plane of the entire touch screen. According to the two-dimensional capacitance change data of the touch screen, the coordinates of each touch point can be calculated. That is, the real multi-point coordinates can be calculated to realize multi-touch;
Q: About the capacitive screen we are using now, the power supply interference problem is very serious. What should we do to eliminate the interference of the power supply?
Apart from scanning frequency to avoid the noise frequency of the power supply, improve the signal-to-noise ratio of the screen? Is there any other way? A: Seeing from all current cases, power supply interference is mainly concentrated in large-size TP (7inch or above), and we have the following solutions: (1) Choose a quality power supply. This is very important and the most effective and fundamental way to solve power disturbances; (2) Frequency hopping. Use the spectrum analyzer to find the area where the common mode interference strength of the adapter is small, and then set the TX scan frequency to this area through software setting, which can effectively control the interference. If there is interference in the full frequency band, it is recommended to abandon the adapter; (3) Improve the signal to noise ratio. In the initial design of TP (7.0inch or above), consider using the low-impedance surface-rent material for the RX signal channel and using the design of the double-sided trace. Try to control all the channel resistances within 10K, which can effectively control the power supply interference. ; (4) It is also possible to change the charger, increase the algorithm filtering, and adopt Cypress, EETI, ILI schemes with strong anti-interference performance.
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