[Text / "High-tech LED - Technology and Applications" September issue Long Zonghui]
With the development of the LED display industry for so many years, the design and improvement of the driver IC has been stuck in how to improve the picture quality and simple cost saving, and there are few attempts to simplify the structure of the display box.
"LED display systems need to comprehensively consider improving image quality, simplifying structure, reducing power consumption and other indicators in technological innovation. IC design and innovation must be carried out for these system indicators."
Chen Silong, LED display driver product manager of Hangzhou Silan Microelectronics Co., Ltd. (hereinafter referred to as "Slan Micro") believes that display companies have become more and more urgent in need of more flexible ICs in connection and control methods to help simplify the box. Body structure and application to adapt to various shaped screens.
Improve display quality
At present, the indicators for examining the quality of LED display screens are still refresh rate, gray scale and picture uniformity.
The current universal driver IC can only receive 1 bit of data at a time, and often a gray scale data needs to be repeatedly transmitted multiple times, and the display time of the low bit gray scale is much smaller than the data communication time, and the waiting time affects the brightness utilization rate and the refresh rate. Especially when the serial link is relatively long, the communication speed becomes a major bottleneck restricting the refresh rate.
In order to improve the refresh rate, driver IC manufacturers have introduced high-end driver ICs with built-in PWM function, and need to increase internal RAM for scanning screen applications. However, most of these high-end driver ICs are not reliable enough, the control method is not flexible enough, and the price is expensive, and the overall cost performance is not high.
“We have a unique approach to improving image quality, taking into account the practical effects, reliability and flexibility of control.†Chen Bangyong introduced that SC16749 and SC16750 developed by Silan Micro using patented technology are based on general-purpose driver ICs. Improvement, using the original B-PWM algorithm, effectively solves the contradiction between low-level grayscale display time and data communication time, increases the brightness utilization rate to nearly 100%, greatly improves the refresh rate, while maintaining the universal driver IC High reliability and control flexibility.
The SC17124 is a new module management IC that acts as a bridge between the controller and the driver IC. It integrates large-capacity RAM and built-in PWM function. It can be flexibly configured to support multiple driver ICs. . "A SC17124 can store the grayscale data required by a module's driver IC. The communication with the driver IC is limited to the inside of the module, and the serial link is shorter." Chen Bangyong said that this IC can solve the problem well. The communication bottleneck problem of the universal driver IC improves the refresh rate of the display.
For the scanning screen, due to the existence of parasitic charges on the row selection switch, the improvement of the refresh rate is often accompanied by the appearance of residual images, which greatly affects the picture quality. Silan Micro's various ICs add a shadow pin that can be used to release the parasitic charge of the afterimage and eliminate image sticking.
The fineness of the picture requires a higher gray level, but the high gray level is a contradiction with the high refresh rate. In general, the refresh rate is reduced by half for each additional gray level. Silan Micro has proposed its own patent, which can greatly reduce the impact of grayscale on the refresh rate. High-gray products developed with patented technology can support up to 20-bit grayscale, and the highest grayscale on the market is 16-bit. .
Unfinished
For more information, please refer to the September issue of "High-tech LED-Technology and Applications"
With the development of the LED display industry for so many years, the design and improvement of the driver IC has been stuck in how to improve the picture quality and simple cost saving, and there are few attempts to simplify the structure of the display box.
"LED display systems need to comprehensively consider improving image quality, simplifying structure, reducing power consumption and other indicators in technological innovation. IC design and innovation must be carried out for these system indicators."
Chen Silong, LED display driver product manager of Hangzhou Silan Microelectronics Co., Ltd. (hereinafter referred to as "Slan Micro") believes that display companies have become more and more urgent in need of more flexible ICs in connection and control methods to help simplify the box. Body structure and application to adapt to various shaped screens.
Improve display quality
At present, the indicators for examining the quality of LED display screens are still refresh rate, gray scale and picture uniformity.
The current universal driver IC can only receive 1 bit of data at a time, and often a gray scale data needs to be repeatedly transmitted multiple times, and the display time of the low bit gray scale is much smaller than the data communication time, and the waiting time affects the brightness utilization rate and the refresh rate. Especially when the serial link is relatively long, the communication speed becomes a major bottleneck restricting the refresh rate.
In order to improve the refresh rate, driver IC manufacturers have introduced high-end driver ICs with built-in PWM function, and need to increase internal RAM for scanning screen applications. However, most of these high-end driver ICs are not reliable enough, the control method is not flexible enough, and the price is expensive, and the overall cost performance is not high.
“We have a unique approach to improving image quality, taking into account the practical effects, reliability and flexibility of control.†Chen Bangyong introduced that SC16749 and SC16750 developed by Silan Micro using patented technology are based on general-purpose driver ICs. Improvement, using the original B-PWM algorithm, effectively solves the contradiction between low-level grayscale display time and data communication time, increases the brightness utilization rate to nearly 100%, greatly improves the refresh rate, while maintaining the universal driver IC High reliability and control flexibility.
The SC17124 is a new module management IC that acts as a bridge between the controller and the driver IC. It integrates large-capacity RAM and built-in PWM function. It can be flexibly configured to support multiple driver ICs. . "A SC17124 can store the grayscale data required by a module's driver IC. The communication with the driver IC is limited to the inside of the module, and the serial link is shorter." Chen Bangyong said that this IC can solve the problem well. The communication bottleneck problem of the universal driver IC improves the refresh rate of the display.
For the scanning screen, due to the existence of parasitic charges on the row selection switch, the improvement of the refresh rate is often accompanied by the appearance of residual images, which greatly affects the picture quality. Silan Micro's various ICs add a shadow pin that can be used to release the parasitic charge of the afterimage and eliminate image sticking.
The fineness of the picture requires a higher gray level, but the high gray level is a contradiction with the high refresh rate. In general, the refresh rate is reduced by half for each additional gray level. Silan Micro has proposed its own patent, which can greatly reduce the impact of grayscale on the refresh rate. High-gray products developed with patented technology can support up to 20-bit grayscale, and the highest grayscale on the market is 16-bit. .
Unfinished
For more information, please refer to the September issue of "High-tech LED-Technology and Applications"
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