1.What is LED display driver IC
2.How many types of LED display driver IC are there?
3.Manufacturer information of LED display driver
4.What are the common models of LED display driver IC?
5.How to replace the LED display driver IC.
1.What is LED display driver IC
The LED display driver chip drives the LED display screen to display in a predetermined form by controlling the lighting conditions (on, off, brightness) of each LED of the LED display screen.
The performance of the LED screen driver chip affects the display quality of the LED display screen. It plays a vital role.
LED lamp beads are current characteristic devices.
Under the premise of saturated conduction, the brightness of the LED lamp changes as its current changes.
Does not change with changes in the voltage across both ends.
Therefore, the driver chip generally uses a constant current source. Drive mode.
The constant current source driving method can ensure the stable driving of LBD lamp beads and eliminate the flickering phenomenon of LED display.
Because LEDs have fast time response characteristics, they can be driven in pulse mode to emit light.
led PWM (Pulse Width Modulation, pulse width modulation) is usually used in the industry to achieve brightness and grayscale control.
The brightness of the LED is related to the amount of current flowing through it.
And the grayscale of the LED is related to the length of time the current is on.
The shorter the conduction time of the current, the lower the grayscale and the lower the brightness.
The driver chip realizes different grayscales by controlling the conduction time of the LBD current per unit time.
The grayscale of the LED is proportional to the conduction time in the scan cycle, so the grayscale level is determined by controlling the LBD conduction time and scan.
This is achieved by the ratio of cycles. In addition, the grayscale level is determined by the number of grayscale data bits supported by the driver chip.
For example, the grayscale level of a 16-bit driver chip is 65,536.
2.How many types of LED display driver IC are there?
LED display driver IC is divided into general IC, dual latch IC and PWM IC according to the refresh rate of the LED display.
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LED display universal driver IC
The universal chip is an LED display driver chip specially designed based on the light-emitting characteristics of LED.
It is used to drive outdoor LED displays. It has the characteristics of large output current and constant current, and is suitable for outdoor LED displays with high current.
Because the brightness of outdoor advertising LED displays is very high, the current of the driver IC required to match the LED display is also very large.
For example, the MBI5020 gathered in Taiwan is a general-purpose chip.
The LED screen universal chip can provide a high-precision constant current source for the LED display screen to ensure the balance of the luminous quality of the LED lamp beads in each channel.
Meet the human eye’s needs for light perception differences and ensure uniform image quality output.
For the LED display market and LED photo market, general chips can also add some special functions to meet user needs, such as current gain adjustment, spot inspection and other functions.
LED displays using general-purpose chips often suffer from “ghosting” and “caterpillars”.
There are also display problems such as stroboscopic lines and shaking caused by insufficient refresh, and color distortion and uneven brightness caused by low contrast.
These display problems will greatly reduce the display effect of the LED display.
The LED display universal driver IC determines the refresh frequency of the LED display.
The general refresh frequency reaches 960HZ.
LED display universal driver IC is the cheapest and is generally used in P10, P8, P6, and P5 outdoor LED displays.
Because these outdoor advertising LED displays have high brightness requirements and low prices.
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Dual latch chip
On the basis of the LED display universal chip, the dual latch chip adds a cache space.
The general-purpose chip only has one cache space.
When transmitting low-grayscale data (the OE width is very narrow and the brightness is very low), the general-purpose chip needs to wait for the data transmission to be completed before display output.
The brightness efficiency of the LBD display is relatively low.
The dual-latch chip adds a cache space specifically for caching data, which can effectively improve the brightness.
The dual latch chip meets the user’s needs for high refresh rate, high brightness efficiency and blanking function.
But the disadvantage of the dual latch chip is that when you take a photo of the LED display with your mobile phone, the photo effect is relatively poor.
Double latch chips are generally used in indoor LED displays and indoor fixed LED displays.
Because the brightness of the indoor LED display is only 800CD/square-1200CD/square, the LED display driving IC current is relatively small.
However, the refresh rate of indoor LED displays is higher than that of outdoor LED displays.
The refresh rate requirement is 1920 HZ. The price of the dual-latch chip is higher than that of the general-purpose chip.
For example, the IC of CHIPONE 2028 is a double-double latch chip. as the picture shows:
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PWM IC
The PWM chip adds a RAM module to the general-purpose chip for 16-bit data displacement cache.
The PWM chip uses the cached grayscale data and the grayscale clock to work together to divide the LED conduction time into several shorter conduction times while maintaining the grayscale accuracy.
Not only does this increase the refresh rate, it also reduces the requirement for the controller to send a grayscale clock.
The visual refresh frequency is greatly improved, thereby reducing the number of LED display screen flickers.
The built-in PWM high refresh algorithm has the characteristics of high visual refresh frequency, high gray scale and high utilization.
PWM chips have a larger and wider band width than dual latch chips and general purpose chips.
The PWM chip has its own internal memory, and its internal chip area is 4 times larger than dual latch chips and general-purpose chips.
But the price of PWM chips is also much higher than dual latch chips and general-purpose chips.
PWM IC is often used in indoor rental LED displays, outdoor stage LED displays, and church LED displays.
PWM IC can make the refresh rate of rental LED display screen reach 3840HZ.
It can satisfy the audience to perfectly shoot and record the performance activities.
But the price of PWM chip IC is relatively high.
LED display driver manufacturer information
Only by understanding the manufacturer information of LED display driver in detail can we know how to choose LED chip IC.
The market concentration of LED display driver chips is very high, and the technology of chip products is relatively mature.
The situation in which major international manufacturers dominate the market has changed with the improvement of the market competitiveness of Chinese driver chip design companies.
First of all, companies such as Chipone, SUMACRO, Silan Micro, Meanwei, Fuman, and Vision Chip have unique chip manufacturing processes and cost control throughout the industry chain.
Achieving reliable product performance and ultra-low product prices.
This enables its chip products to occupy a high market share in the highly competitive LED display field.
Secondly, some Taiwanese companies, such as Macroblock Technology and Mingyang, have strong funds and advanced chip manufacturing technology.
It has strong market competitiveness and high market share in the field of LED display screens, and is in a leading position in the field of high-end driver chips.
Finally, some traditional driver chip manufacturers, such as Texas Instruments and Toshiba, developed earlier in the field of LED display driver chips and have obvious advantages in patented technology.
However, its advantages in price and product performance are not obvious, so its market share continues to shrink.
What are the common models of LED display driver IC?
Here, LEGIDATECH shows customers different chip models and manufacturers. The following table:
Common manufacturers and models of LED display driver ICs：
| CHIP IC Brands | General IC | Dual latch IC | PWM IC |
| Macroblock | MBI5024 | MBI 5124 | MBI5153 |
| Chipone | ICN2028 | ICN2038S | ICN2053 |
| SUMACRO | SUM2017 | SUM2017TD | SUM2035 |
| Mingyang | MY9168 | MY9868 | MY9748 |
| Meanwell | SM16017 | SM16237 | SM16259 |
For general ICs, when we don’t know the quality of which chip, we only need to know the LED display driver IC of the same brand.
As long as the number of the driver IC model is larger, it means the refresh rate of the LED display will be higher.
The higher the refresh rate of the LED display, the better the display effect of the LED display.
7. How to replace the LED display driver IC.
If the LED module display fails, we only need to replace the driver IC in the corresponding control area.
In the following video we show how to replace the LED display driver IC.
Summary:
When purchasing an LED display, we must consult the LED display factory about the LED display driver IC.
Because the LED display driver IC determines the service life and display effect of the LED display.
LEGIDATECH is an LED display factory.
Our sales staff will definitely explain to you the relevant knowledge of LED display driver ic during the sales process, so that you can buy with confidence.
