The driving circuit of COB small-pitch LED display adopts advanced control technology, which can achieve precise brightness control and color reproduction, ensuring high-quality display effect.
Its driving modes include common cathode and common anode. The common cathode driving architecture has higher energy-saving efficiency, which can reduce product power consumption by 25%~40%, while ensuring the authenticity of color, providing reliable power guarantee for the stable operation of the display.
Introduction
COB (Chip on Board) small-pitch LED display, as a representative of modern display technology, is widely used in various occasions with its high resolution, high brightness, high contrast and other characteristics.
As the core part of the LED display, the design and performance of the driving circuit directly affect the display effect and service life of the entire display.
This article will give a detailed introduction to the driving circuit of COB small-pitch LED display.
Basic principle of LED display
Working principle of LED
LED is a semiconductor device that converts electrical energy into light energy. It is composed of P-type semiconductor and N-type semiconductor, and realizes the conversion of electrical energy to light energy through PN junction.
The luminous color of LED is determined by the composition of semiconductor materials. Common ones are red, green, blue, etc.
LED display screen composition
LED display screen is composed of a large number of LED pixels, which are controlled by the driving circuit to realize the display function.
Pixels are arranged in a matrix or cross-row manner to form a complete display surface.
COB small pitch LED display screen driving circuit
Basic composition of driving circuit
The driving circuit is mainly composed of row driving circuit and column driving circuit, and selectively drives LED pixels through control signals.
The row driving circuit is responsible for controlling the LED pixels of each row, which is realized by selecting switches and row driving chips.
The column driving circuit is responsible for controlling the LED pixels of each column, which is realized by column driving chips and preprocessing circuits.
Working principle of driving circuit
Take the dynamic scanning driving circuit as an example. Multiple rows of LEDs on the display screen share a set of column driving registers. Through the time-sharing work of the row driving tube, each row of LEDs is lit.
The row scanning control circuit generates a signal to turn on a row scanning tube, and the positive end of the LED in the row is connected to a high level. At this time, the light and dark of the LED in the row depends on the signal in the column driving circuit.
According to the input signal, the column drive circuit converts the signal into a control signal suitable for the column drive chip through the preprocessing circuit to control the LED pixel points of each column.
Design features of the drive circuit
Adopt advanced control technology to achieve precise brightness control and color restoration to ensure high quality of display effect.
Support high refresh rate to ensure the smoothness and stability of the display screen.
Adopt reliable power supply technology, such as strong and weak power separation power supply technology, to ensure safe use.
Support power backup redundancy to ensure that normal display is not affected by a single power failure.
Key technology of drive circuit
Selection of control chip
Select high-performance, low-power control chip to improve the performance and reliability of the drive circuit.
The control chip should have sufficient driving capacity and stability to meet the needs of the display.
Optimization of drive mode
Adopt advanced drive mode, such as dynamic scanning drive mode, to improve drive efficiency and display effect.
Optimize the design structure of the drive circuit to reduce power consumption and cost.
Design of power supply circuit
Design a reasonable power supply circuit to provide stable voltage and current to ensure that the LED is within the normal working range.
Adopt efficient power management strategy to reduce power consumption and heat generation.
Conclusion
The driving circuit of COB small-pitch LED display is the key part to achieve high-quality display effects. By adopting advanced control technology, optimizing driving methods and designing reasonable power supply circuits, it can ensure that the high resolution, high brightness, high contrast and other characteristics of the display are fully utilized.
With the continuous advancement of technology and the continuous expansion of applications, COB small-pitch LED display will be widely used in more fields.