Show the key role of the drive chip in the LED display

In the structure of the LED display, the PCB board on the back is covered with many ICs. Among these ICs, the driving IC played a vital role, and its influence and role should not be underestimated. This article will analyze the role positioning of the driving chip in the LED display, as well as the development trend of energy -saving and integrated energy.

A. Show the core role of the driving chip

The display driver chip mainly assumes the heavy responsibility of receiving and processing the display data in the full -color LED display. It can receive the internal PWM (pulse width modulation) protocol to display data, which comes from the source of video cards or processors. Drive chips control the brightness level of LED through the current output, refresh the frequency, and other parameters related to PWM current, thereby lighten up the LED and present images. The display driver IC and logic IC, display peripheral supporting IC coordination work, jointly determine the current display status of the LED display, including key visual effects such as color, brightness, and contrast. How does the LED chip shine?

B. Display the classification of the driver chip

GM chip

Universal chips are not designed for LED display, but some logical chips have partial logic functions suitable for LED display. This type of chip is more common in early LED display applications, but because it is not optimized for the characteristics of LED, there are certain limitations in display effects and stability. Take you to understand the difference between CSP and COB LED chips.

Special chip

The dedicated chip is a driving chip specially designed according to the LED luminous characteristics. LED is a current characteristic device. In the saturation state, its brightness will change with the changes of the current, rather than changing the voltage at both ends. Therefore, one of the core features of the dedicated chip is to provide constant current. The constant current driver can ensure the stability of the LED, effectively eliminate flashing phenomena, and lay the foundation for LED high -quality display. In addition, some special chips for specific industries have special functions, such as LED error detection, current gain control, and current correction function, which further enhances the reliability and display effect of the display.

C. Show the development process of driving chips

In the 1990s, the LED display was mainly applied to monochrome display. At that time, the constant voltage driver IC was used. In 1997, China ushered in the first -generation LED display special driver IC -9701, and its gray range expanded from 16 to 8192, achieving the display effect of what they saw, which marked the LED display driver technology Major breakthrough. Subsequently, the LED constant current driver became the mainstream choice of full -color LED display driver because of its high match with LED's luminous characteristics. The higher -integrated 16 -channel and 8 -channel driver chip gradually replaced the early driving solution. By the late 1990s, companies such as Toshiba in Japan, the United States, and China Riyuecheng have launched the 16 -channel Hengliu LED drive chip. In the early 21st century, companies in Taiwan also joined the production ranks of driving chips. Today, in order to solve the problem of small -spacing LED display PCB wiring problems, companies such as Sun and Moon Cheng have launched high -integrated 32 -sweep 48 -channel constant current LED drive chips, which has promoted the further development of LED display technology. Take you to understand LED chips: technology, application and development.

D. Show the performance requirements of the driver chip

In the performance indicators of the LED display, the image refresh rate and gray expression are two critical items. This requires that the driver IC must have high consistency, high -speed communication interface rate, and constant response speed at high -speed communication interface. In the past, the relationship between refresh rates, ash levels, and utilization rates often need to sacrifice one of the indicators to ensure that the other one or two performances are better. Therefore, many LED displays are difficult to take into account the refresh rate and gray in practical applications, either a black line appears during high -speed camera equipment, or the color is bright and dark. With the continuous advancement of technology and the improvement of IC R & D level, these problems have now been effectively solved. In the application scenario of the LED full -color display, in order to ensure the comfort of the user's long -term viewing, low -brightly and high gray has become one of the important criteria for measuring IC performance.

E. Show the development trend of the driver chip

Energy -saving trend

Green energy -saving is the eternal pursuit of the LED display industry, and it is also one of the key criteria for judging the performance of driving IC. The energy conservation of the driver IC is mainly reflected in two aspects: one is to reduce the turning point voltage constant current. By optimizing the chip design, the energy loss in the constant current driver is reduced; the other is to use the optimization algorithm and IC design to reduce the working voltage and working current. Sun and Moon Cheng's first iDle Stop (dynamic low power consumption) energy -saving technology, which greatly reduces power consumption, makes the screen body lower, more power saving when the black screen stands standby, especially suitable for LEDs that require 7 × 24 hours uninterrupted work. Display provides strong support for the long -term stable operation of the display.

High integration trend

With the rapid decrease in the pixel spacing of the LED display, the number of packaging devices installed is exponentially increased, which greatly increases the module's component density. Taking a small spacing P1.9 LED as an example, in the 15 -sweeping 160 × 180 module, 90 modules need 45 row pipes and 2138 constant current drive ICs. Such many devices make the PCB wiring space extremely crowded, increasing the difficulty of circuit design. At the same time, complicated component layout also easily leads to problems such as poor welding, thereby reducing the reliability of the module. In order to cope with this challenge, reducing the number of driving ICs and expanding the PCB layout area has become an inevitable choice. Therefore, the application demand for driving IC has been pushed to the high -integrated technology development route. In recent years, related companies have been committed to the development of ICs to highly integrate ICs, which has reduced the overall proportion of ICs by 71%compared to the traditional solution. High -quality and more efficient experience.

In summary, the display driver chip plays an indispensable key role in the LED display. From the receiving processing display data to the stable driver of LED, its performance directly affects the display effect and service life of the display. With the continuous development of technology, it shows that driving chips are steadily moving in the direction of energy conservation and high integration. This will not only promote the continuous upgrade of LED display technology, but also provide a broader space for the application expansion of related industries.

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