Intercross scanning control with double driver for micro-LED display |
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| Affiliation: | 1. Institute of Logistics Science and Engineering, Shanghai Maritime University, Shanghai 201306, China;2. Anhui Longquan Silicon Materials Co.,Ltd, Huaiyuan, Anhui 233400, China;1. School of Electronic and Computer Engineering, Peking University Shenzhen Graduate School, Shenzhen 518000, China;2. R&D Center, TCL China Star Optoelectronics Technology Co., Ltd., Shenzhen, China;1. The School of Electrical and Information Engineering, Tianjin University, 300072, China;2. Alibaba Group, Hangzhou 310052, China;1. Key Laboratory of Digital Medical Engineering of Hebei Province, Baoding 071000, China;2. College of Electronic and Information Engineering, Hebei University, Baoding 071002, China;3. College of Physics Science and Technology, Hebei University, Baoding 071002, China |
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| Abstract: | This paper proposes a control chip for micro-light emitting diode (μLED) applied on real-time display system. The μLED control system has the video transmitter and the LED display matrix. The transmitter includes interface control, memory management, image format conversion. For LED display unit, we present the intercross scanning, memory management, PWM output controller, gamma correction for LED brightness control. TheμLED display is controlled by the intercross drivers to reduce the flicker and promote the sweeping speed with two FPGA controllers, where two parallel SPI data is adopted. The micro LED components are mounted on a PCB with mass-transfer techniques successfully. The FPGA controller can drive about 10 k light-emitting diodes with 12-bit colors for displaying system with PWM method. The passive-matrix micro LED (PMLED) driving can achieve 384 refresh rates with 50 MHz clocking frequency. The experiments result low flicker achieved, which the SVM index is only 1.5 with a photometer measurement. |
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| Keywords: | PWM Micro LED Refresh rate FPGA control Memory management |
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