기술 지식 | LED 디스플레이 램프 비드 손상에 대한 일반적인 원인 및 솔루션

LED 디스플레이 작동 중, the stability of the lamp bead is directly related to the display effect and service life of the screen.

1.Abnormal power supply

• Problem description: The power supply is not working properly or the wiring polarity is wrong, causing the lamp bead to not light up or be damaged.

• 해결책: Confirm whether the power supply is started normally and whether the indicator light is on; check whether the positive and negative poles are connected correctly to avoid reverse connection.

2.Voltage and current do not match

• Problem description: Excessive current causes the lamp bead to burn out, especially different colors of lamp beads have different current tolerance.

• 해결책: Select a power supply that matches the rated parameters of the lamp bead, and install a current limiting resistor if necessary. Yellow lamp beads are more sensitive to current and should be paid special attention.

3.Determine the luminous color

• Operation suggestion: Use a 3V button battery test to quickly identify the color of the LED lamp bead, which is convenient for procurement and pre-installation screening.

4.High-power LED lamp bead burns out

• Problem description: Excessive current or lack of constant current drive causes the gold wire to fuse and the lamp bead to be scrapped.

• Technical parameter reference: The standard 1W lamp bead current is about 350mA and the voltage is 3.2-3.6V. Three common 1W modules require a 12V constant current source for power supply, and direct connection to 220V is prohibited.

5.The lamp bead turns yellow

• Cause analysis: The epoxy resin and the curing agent do not match, or the packaging baking time is improperly controlled.

• 해결책: Select a complete set of packaging materials, standardize the production process, and strictly control the curing time.

6.Lamp bead leakage

• Cause analysis: The electrostatic protection is not in place, the equipment is not grounded, the operator does not wear an electrostatic wristband, or the chip itself has hidden dangers.

• 해결책: Ensure that the electrostatic protection system is in place and strictly implement the ESD operating specifications.

7.LED is a resistive device

• Principle description: LED is essentially a diode, not a capacitive or inductive load. Brightness control is achieved by adjusting the current, and a forward voltage of 2-3.5V is required.

8.Light decay problem Main reasons:

• Poor thermal conductivity structure design

• Yellowing of packaging material

• Poor contact between chip and bracket

• High attenuation rate of chip itself

Coping strategies: Select high thermal conductivity bracket, strong stability packaging material, high-quality chip, and ensure reliable process.