Shortcoming:
1. Ambient light factor, infrared acceptance tube has the scale of operation between small sensitivity and large illumination, but the contact screen product can not limit the scale of use, from the dark song hall private room to the outdoor use under the high-intensity sunlight on Hainan Island, as a product, it must adapt.
2. Rapid detection, the infrared contact screen generally has a small scale, and there are 64 sets of infrared tubes, which means that at least a infrared detection is required to be completed within 0.4 milliseconds. Surrounding reflection, refraction, agitation, infrared emission tube has an emission angle, receiving tube has a larger scale acceptance angle, if the surrounding reflection to a certain extent, you will find that the finger can not block the signal anywhere. To deal with these problems, the greater advantage of selecting the imitation method is that it can analyze the resolution of the progressive contact screen, but the anti-disturbance method is not as good as the pulse method; Although the selection of pulse method can be strong in anti-interference, there is a problem that the pulse method needs a response process time on the receiving side, while the contact screen requires extremely fast speed, so it is necessary to have skills in several aspects such as adaptive circuit, single-chip microcomputer software, mold design, and light transmission data selection.
3. The infrared contact screen relies on multiple pairs of infrared emission to accept the tube to operate, the infrared tube performance and life are more reliable, any object that obstructs the light can be used as a contact, but the infrared contact screen uses nearly 100 pairs of sensors, and shares the peripheral circuit, which requires the sensor not only to have good performance, but also requires nearly 100 pairs of infrared diodes "light-resistance characteristics" and "junction capacitance" are consistent. In practical application, if there is a problem with any pair, it can be found in the power-on self-test process and then neglected, and replaced by adjacent infrared rays, because each pair of infrared only "supervises" a narrow band of about 6mm, and the finger is usually about 15mm thick, the user is not perceptible. However, if the production process does not carry out the aging test of the infrared emitting tube, and there is no good quality management system, nearly 100 pairs of sensors will soon not be a pair of pairs of "falling behind", and the overall life span will be difficult to guarantee.
4. The infrared screen relies on the infrared matrix, the x and y coordinates of multiple points on the matrix can be combined to form more square contact points, see the figure below, A, B and C, D two points are the same effect on the infrared screen, can not be distinguished, how to deal with it? At present, the infrared screen on the market is not judged to be the common treatment of multi-point contact, whether it is continuous or not, or it is judged to be the upper left corner, that is, whether it is A, B or C and D in the figure below, it is judged to be point C. The infrared screen with hard real skills should be the middle point of the multi-point contact judgment of the coordinates, that is, the contact of large objects (such as thick fingers), and the multi-point contact that is not connected is not judged, so it is said that the skill is excellent because this algorithm has stricter requirements for the quality of the product, and it is not allowed to present all kinds of faults.
Merit:
1. The advantage of the infrared contact screen is that it can be reached with fingers, pens or any object that can block the light.
2. The disadvantage of the infrared contact screen is that it feels bad when used on the spherical display, which is because the infrared grating matrix that relies on the operation is obviously required to ensure that it is on the same plane, therefore, the real induction contact operation plane is far from the arc-shaped display screen, especially in the corners, but this shortcoming does not exist on the flat display, such as the liquid crystal display.
3. It can be said that the infrared contact screen has appropriate advantages when used on flat panel displays. Infrared exploration skills can use the same wavelength of infrared emission tube, infrared receiving tube (referred to as infrared tube) to get a brief infrared exploration method: as long as there is an object blocking the connection between the infrared tube, the acceptance signal will drop sharply, so infrared can explore the obstruction of the object, in the anti-theft system, active induction system, counter and other systems are widely used.
4. If infrared is a short-distance application, the degree of obstruction can also be detected according to the attenuation degree of the receiving signal, which is the so-called imitation method, and the imitation method adopts a dense receiving tube array at the receiving end, and can also be used for contrast imaging; In order to avoid disturbance, infrared exploration can also use the pulse method, that is, the infrared emitting tube emits a signal of a fixed frequency, and the receiver only detects this frequency, and the pulse method can be very strong in anti-interference. If the pulse method modulates the signal on the operating frequency, it can also be used for digital communication, which is the famous infrared communication, remote control of household appliances, infrared communication of computers, and even today's fast optical fiber communication. Infrared communication has no effect on the human body, and the transmission distance is short and there is no space pollution, so it is highly favored today. This chapter is intended to contact the screen, not to iQue Other, but from the prosperity of this clan, it can also be seen that the infrared contact screen has a great future.
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