Application of led pixel module

Led pixel module In particular to a LED pixel light string, which includes at least one LED pixel light, LED pixel light, including light shell, light shell surface has a plurality of holes(use to heat radiation), each hole is provided a place to install an LED lamp, There are interface on both ends of led pixel shell, between two adjacent pixels led lights through a flexible wire connection.
After the structure is adopted, between the LED pixels lamp is connected by flexible wires, a plurality of pixel lights are connected into a pixel lamp string a plurality of pixel lamp string can be arranged into a flexible display directly . convenient installation, high work efficiency; each pixel lamp comprises a plurality of pixels,  each pixel lamp comprises a plurality of pixels, which makes the display with a transparent, lightweight, the advantages of quick installation, disassembly.

LED infrared light category products into red burst and no red burst categories. Red explosive products using 850nm LED Strip control led, in use, close observation, dark red light emitted infrared led.Red explosive products without the use of a wavelength as 940nm ir led strip, the use of infrared light surface without any infrared light, and therefore more subtle. the sensitivity at 850nm wavelength for the camera, the 850nm’ sensitivity to 10 times better than 940nm wavelength. So this has a slight red storm 850nm infrared light with higher efficiency, it should be the first choice as an infrared led.

Application Notes When fitting the ir led strip:  the matters should be paid attention to: nfrared light strip should be kept clean, good condition,especially in the front part of ir led strip can not exist like dirty contaminants, more not by friction damage, otherwise, the led will produce a reflection and scattering phenomenon from the infrared light strip, affect the infrared communication directly.

• Tools / raw material - Ir led strip
  in the course of ir led strip’work the parameters are not allowed to exceed the limit, and therefore the selection should be noted that when the substitution model and parameters of the original pipe, can not easily replace. Further, any change can not be the current limiting resistor of ir led strip
  • 2.2

  Because of the range of infrared wavelengths very wide, the led infrared light  must use paired with infrared receiving diode, otherwise it will affect the remote control sensitivity,
  and even cause loss of control.Therefore in the replacement selection, must be attention to the emission wavelength of infrared signal.

  • 3.3

  The packaging(smt package) material hardness of ir led strip is low,so the high temperature performance is worse,
  to avoid damage to joints should be away from the root of the day pin, welding temperature is not too high, not too long time more,

Infrared light uses–The data of Infrared light emitting diode 

Many kinds of the light emitting element in markey,
according to the spectrum can be divided into a light emitting element and a visible light to infrared light emitting element In the practice, introduces to the infrared ray emitting element, gallium arsenide(GaAs) is based on the infrared emitting two Polar tube (also known as infrared emitting diode) as the main body,  to describes the basic characteristics and application circuit of ir led.(a), basic characteristics
1 current voltage characteristics
The circuit symbol and the electrical characteristic curve of infrared light emitting diode , as shown in figure

1. Anode (P pole) Power Positive empty into the Positive voltage, the cathode (N-pole) applying a negative voltage,.  at this time and voltage diode forward voltage, but also produce Forward current, diode emits
beam energy emitting infrared provides, the lightconditions and general hair Light emitting diode (LED), but the infrared is not visible.in general Body voltge of Gallium arsenide infrared emitting diode is about to be 1V, and voltage of red luminescence gallium quality diode is 1.8V;  voltage of green luminescence gallium quality diode is 2V. After empty into the voltage exceeds the basic voltage, current is rising rapidly, The starting voltage influence of diode is also great by the surrounding temperature, when the temperature is higher, will make the cut in voltage value decrease, on the contrary,The starting voltage is reduced.—Infrared light emitting diode working in reverse voltage, only a small leakage current, but the reverse voltage exceeds the collapse When the voltage collapse, will immediately generate a lot of current, will make the element burnout, general infrared diode reverse voltage Value is about 3~6V,  when in use, try to avoid this happening.

infrared light uses–Data of Infrared light emitting diode1

The principle and characteristics of the infrared light emitting diode

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Light is an electromagnetic  wave, its wavelength range from several nanometers(1nm=10-9m) to 1 mm (about mm). Visible only a part of them, which we call visible light, range of visible light wavelength is 380nm ~ 780nm, visible from long to short wavelength is divided into red, orange, yellow, green, cyan, blue, purple, violet  wave length than known as the short wavelength ultraviolet light, longer than infrared light is called infrared light.Spectral characteristics of ordinary black and white CCD camera can feel the light, it can not only feel the visible light, and the infrared light can be felt. This is the use of CCD camera, the basic principle of  CCD camera can be more economical to achieve the vision cooperation with the ir infrared light .  The  Instead of spectral characteristics of ordinary color camera can’t feel infrared light, and therefore can not be used for night vision.Infrared led  divide into  semiconductor solid light (infrared emission tubes) infrared light and heat radiation of infraredd light，according to the infrared radiation mechanism .
Its principle and characteristics are as follows:
Theory and the characteristics of  infrared emitting diode (LED)Infrared light emitting diode array is composed of two  the luminous components .The infrared emission level two tube infrared radiation from the high efficiency ofmaterial (often made of PN junction GaAs GaAs), empty the forward bias injection current into the PN junction and infrared light of excitation. The central wavelength of spectral power distribution as 830 ~ 950nm,the bandwidth of  half peak as about 40nm, it is a narrowband distributed, just  the CCD  camera can feel range. Its biggest advantage is completely without red storm, (with 940nm ir led ~ 950nm wavelength infrared tube) or only has faint red storm (red storm for visible light) and long life.

The work principle of the photo electric sensor (principle of infrared led sensor)
The ir led sensor is made by change of light intensity converted into the electrical signal and to achieve control of other device。in general the ir led sensor are divided into: transmitter receiver and detection circuitThe transmitter emits a light beam to the target, In generally the beam of light emitted from the semiconductor light source, such as light emitting diode (LED), laser diodes and infrared emitting diode(ir led). Beam launch continuously, or change the pulse width. The receiver has a photodiode, a photoelectric triode, light battery. In front of the receiver, with optical components such as lenses and aperture etc.. Behind of the detection circuit, it can filter out the effective signal and the application of the signal.In addition, the structural of the photoelectric switch has transmitter board and the optical fiber.Triangle reflecting plate is launching device firm structure. It consists of a triangularrcone reflecting material is very small, can make the beam accurately returned from thereflecting plate, has the practical significance. It can be in the 0 to 25 range and the optical axis changing emission angle, so that the beam is almost the rays from a root,after reflection, it’s will be returns from the roots of anti ray.Classification and working style

⑴    The tank type photoelectric sensor

A light emitter and a receiver face to face arranged on both sides of a groove is a groove shape photoelectric. Light emitting device emits infrared or visible light, in the absence of resistance under the condition of light receiver can receive the light. But when the  detected object go through the groove and the light is blocked, the photoelectric switch action. The output a signal of switch control, switching on and off load current, thus completing a control action. The  detection distance of groove shaped switch just only has only a few centimeters. Be case of the structure.
The correlation type ir led sensor

If the light emitting device and receiving device is separated, can make the detection distance is increased. By a light emitting device and a light receiving device is composed of a photoelectric switch is called a shot of the separation type photoelectric switch, referred to as the opposite type photoelectric switch. Its detection distances of up to a few meters or even tens of meters. When using the light emitting device and a light receiving device are arranged in the detected object through the path on both sides respectively, detection through to block the light path, a light receiving device will be output a switch control signal.

The reflection type ir led switchThe light emitting device and a light receiving device in a device, mount a reflecting plate in front of it, complete the photoelectric control function  using the reflection principle，this is called reflection plate type (or mirror reflection type photoelectric switch). Under normal circumstances,

The receiver  receiving the lights from the emitting device with the reflected light plate; once the object to be detected is blocked, the light receiving device receives no light, a photoelectric switch on the action, the output a signal of switch control.

The electrical properties of infrared light emitting diode -

Infrared light emitting diode is 3mm in diameter, 5mm is a small power infrared, diameter is 8mm, 10mm is a medium power and high-power transmitting tubes. Small power transmitting tube forward voltage: 1.1-1.5V, current: 20mA. In power transmitting tube forward voltage: 1.4-1.65V, current between 50-100mA.  High power transmitting tube forward voltage as 1.5-1.9V, current between 200- 350mA 。use ir strip wavelength: 980nm, 940nm,880nm, 850nm, 870Nnm in general.
the relationship between infrared emission tube Power and infrared emission tube wavelength is: 850nm>880nm>940nm. Infrared light emitting diode –principle
The infrared light emitting diode principle is the method of infrared emitting and receiving, can be divided into two types, one is the direct type, two is a reflective.
refers to a light-emitting tube and receiver tube placed in opposite ends of a controlled substance with the launch .the middle of a certain distance. Infrared light emitting diode reflection type refers to the light emitting tube and a receiving tube tied together, usually receiving tube operation always without light, the luminous tube to emit infrared light encounters reflector, infrared ray receiving reflected back to work. The use of dual infrared emission circuit , can increase the transmission power to a great extent, increase the emission distance of led infrared.

Infrared light emitting diode - distance

Infrared light emitting diode radiation has a very strong when in use, depending on the optical axis distance varies,  due to the different light-receiving element and the distance change,the amount of change in infrared light-emitting diode light receiving element between the incident light and the infrared LED showed a certain characteristic inversely as the square of light to measure the distance.  To control the corresponding controlled device with emitting infrared, the distance between the control and the emission power is proportional. In order to increase the distance of the actual control of infrared, infrared emitting diode in a pulse state during,  between the effective transmission distance and pulse peak current is proportional to control the pulsating light.

Infrared led light emitting diode application
Infrared light emitting diode in daily use, some TV infrared remote control, The work pulse duty cycle of infrared LED between about 1 / 3-1 / 4, the infrared remote control of electrical equipment, the duty ratio is: 1/10. In use, the pulse duty cycle can be reduced if a small-power infrared light-emitting diodes on the transmission range greatly increased.
Common infrared light-emitting diodes, the power divided into small power: between 1mW-10mW, the power: between 20mW-50mW,
high power 50mW-100mW above three categories. The above is specific introduction of the infrared light emitting diodes, hoping to serve as a reference.