Key Factors Affecting LEDS Quality

Views : 367
Update time : 2022-09-09 15:07:39

The quality of the led display lies in the use of packaging technology. the key to packaging technology is the packaging of chip materials and the materials required for packaging are directly related to process control. With the media industry, advertising industry, With the rapid development of trade exhibition industry, wedding industry and other industries, as the quality of the display screen increases, the requirements for LED components are getting higher and higher.

 

The materials used in LED packaging mainly include chips, glue, brackets, packaging glue, bonding wires, etc.

 

1) Chip

As the core of the LED device, the LED chip determines the lifespan and luminous performance of the entire LED display. As the cost of LED chips decreases, the size of LED chips is getting smaller and smaller, which brings a series of performance problems.

2)  glue

There are two main types of encapsulation glue: silicone and epoxy resin.

A)Silicone. The silicone phase is cost-effective, excellent in insulation, dielectric and adhesion. The disadvantage is that it is easy to absorb moisture and has weak air tightness. Rarely used in packaging applications for LED devices.

B)epoxy resin. Epoxy resin is easy to age, has poor heat resistance, is susceptible to moisture, and is easy to change color under short-wave light and high temperature. Epoxy resin has certain toxicity, and the thermal stress matching degree of LED is not high, which greatly affects the performance and life of LED.

 

3) LED bracket

A)Structural improvements to the stent design. Because the PPA and the metal are combined physically, the PLCC bracket will have a larger gap after the reflow oven at a high temperature, which will cause moisture to easily enter the device along the metal channel and affect reliability.

 

B) The role of the stent. The PLCC (Plastic Leaded Chip Carrier) bracket is the carrier of the SMD LED device, which plays a key role in the reliability and light output of the LED.

C) Manufacturing process of stents. The PLCC bracket production process mainly includes metal strip punching, electroplating, PPA (polyphthalamide) injection molding, bending, five-sided three-dimensional ink jet and other processes. Among them, electroplating, metal substrates, plastic materials, etc. occupy the main cost of the stent.

4) bond wire

Commonly used bonding wires for LED device packaging include gold wires, copper wires,  and alloy wires, etc.

A)Gold wire. Gold wire is the most widely used and has the most mature technology, but it is expensive, which leads to the high cost of LED packaging.

B ) copper wire. The copper wire is cheap, the heat dissipation is good, and the intermetallic compound grows slowly during the wire bonding process. Disadvantages of easy oxidation, high hardness and high strain strength. Especially in the process of bonding copper balls, copper is easily oxidized, and the formed oxide film reduces the bonding performance, which puts forward higher requirements for process control in the actual production process

Related News
Read More >>
LED Display Aging Test LED Display Aging Test
May .28.2024
LED display aging test is a measure taken based on the characteristics of the product's failure rate curve, that is, the bathtub curve, in order to improve the reliability of the product. If there is a question about frequency, it is not constant current. AC or pulsating current sources can be designed to have a constant effective value, but such power sources cannot be called "constant current sources." Constant current aging is the most consistent with the working characteristics of LED current and is the most scientific LED aging method; over-current impact aging is also the latest aging method adopted by manufacturers. This type of aging is carried out by using a constant current source with adjustable frequency and adjustable current. , in order to determine the quality and life expectancy of LEDs in a short period of time, and to pick out many hidden dangers of LEDs that cannot be picked out by conventional aging. LED display screens can improve performance after aging and contribute to performance stability in later use. A constant current source means that the current is constant at any time.
Basic composition of LED display screen Basic composition of LED display screen
May .28.2024
Simply speaking, the LED display screen is composed of several display units (unit display panels or unit display boxes) that can be combined and spliced, plus a set of appropriate controllers (main control board or control system). Therefore, display panels (or unit boxes) of various specifications and controllers with different control technologies can form many kinds of LED displays to meet the needs of different environments and different display requirements.
About the transparent led display, is the smaller the pixel pitch of the LED display, the better? About the transparent led display, is the smaller the pixel pitch of the LED display, the better?
May .27.2024
The smaller the point density and the gradient of pixel density, the more information capacity can be supplemented per unit instantaneously, and the distance suitable for viewing is closer. On the contrary, the distance suitable for viewing is further away. We need to combine our allocation and reconstruction effects to make the selection. As for the LED display screen, the smaller the pixels, the better. This is inevitable!
How to make a full-color LED display high-definition in seconds? How to make a full-color LED display high-definition in seconds?
May .27.2024
There are two basic prerequisites for achieving high-definition display on a full-color LED display. One is that the video source must be high-definition, and the other is that your LED display must support high-definition display.
pop_close
pop_main
Let Us Bounce Into Your Inbox
Enter your email to hear from us about Product list, Latest Products and Customer application examples !