The importance of LED display driver ICs and the analysis of performance indicators that need improvement

LED display driver IC is such a key component, it is like the central nervous system of the human brain, in charge of the body's physical actions and the brain's thinking consciousness. The performance of the driver IC determines the effect of the LED display screen broadcast, especially the modern large-scale activities and the use of high-end venues, making people's requirements for LED display driver IC more stringent.
This article will fully reveal the importance of LED display driver ICs and the performance indicators that need to be improved, and clearly show the invisible leaders in the brain for reference.
The development history of LED display in China has only been more than 20 years. Driving IC is the most important intellectual expert behind LED display. The development time is not long, but the technological progress is amazing, and with the development of the industry, the future LED The display driver IC will be more intelligent and high-end.
Technical essentials
According to the performance level, the LED display driver IC can be divided into basic models and special models. The performance of the basic model is relatively simple, and it is mostly used for general-purpose and common-type LED displays; the performance of the special models is more perfect, and it is mostly used in mid-to-high-end displays.
The LED display is an electronic product, but unlike ordinary electronic products, its brightness changes instantaneously, so the required power supply industry is extremely particular. The biggest feature of the special chip is to provide constant current source output, ensure stable driving of LED, eliminate the flicker phenomenon of LED, and have the characteristics of large output current and constant current, which is suitable for occasions requiring high current and high image quality.
LED display drive technology focuses on LED grayscale linearity and fast output response (see table below).
LED display screen drive key indicators
Table LED display driver IC key indicators
For LED lighting characteristics, constant current drive is the first choice for LED display drive, while the more integrated 16-channel drive replaces the 8-channel drive. In the late 1990s, companies such as Toshiba of Japan, Allegro and Ti of the United States successively launched 16-channel LED constant current driver chips. At the beginning of the 21st century, China Taiwan's Dianjing Technology and Accumulation Technology's driver chips were also mass-produced and used. Toshiba's TB62726, accumulated MBI5026, Ti's TLC5921, spotted DM134, DM135, etc. were used.
At present, the performance of the general-purpose LED constant current driving circuit is improved in many aspects, such as a smaller constant current deviation, a shorter response time of the current source, and a constant current driving channel to turn on time to reduce current fluctuation. At the same time, each chip factory has also introduced LED constant current drive circuits with additional functions, such as new drive ICs with LED error detection, current gain control and current correction.
Among the performance indicators of LED displays, refresh rate and gray level and image expressiveness are among the most important indicators. This requires high consistency of current between the LED display driver IC channels, high-speed communication interface rate, and constant current response speed. In the past, the refresh rate, grayscale and utilization rate are a trade-off relationship. To ensure that one or two of the indicators can be superior, it is necessary to sacrifice the remaining two indicators. For this reason, many LED displays are difficult to achieve the best of both worlds in practical applications, or they are not refreshed enough. High-speed camera equipment is prone to black lines when shooting, or grayscale is not enough, and the brightness of the color is inconsistent. To this end, the driver IC manufacturers have spent a great deal of effort, and finally made a breakthrough in the three high issues, at present, LED display mainstream driver IC manufacturers have been able to solve these problems.
At present, with the rise of high-density LED displays, how to solve the low-ash problem under high-refresh conditions is also a key task for driver IC manufacturers.

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