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Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
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Protocol Design and Controller Implementation of Automotive LED Matrix Headlamp Control

차량용 LED 매트릭스 헤드램프 제어를 위한 LED 제어 프로토콜 설계 및 제어기 구현

  • Changmin Lee (School of Electronic Engineering and Department of Intelligent Semiconductor, Soongsil University) ;
  • Wonchae Kim (School of Electronic Engineering and Department of Intelligent Semiconductor, Soongsil University) ;
  • Seonghyun Yang (School of Electronic Engineering and Department of Intelligent Semiconductor, Soongsil University) ;
  • Seongsoo Lee (School of Electronic Engineering and Department of Intelligent Semiconductor, Soongsil University)
  • Received : 2023.09.19
  • Accepted : 2023.12.19
  • Published : 2023.12.31
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Abstract

Automotive headlamp with LED matrix exploits low-cost low-speed serial buses such as I2C and SPI for digital LED control. When headlamp resolution increases, LED control data significantly increases to exceed capacity of control bus. This paper proposes HLCP (Headlamp LED Control Protocol), a novel LED maxtrix headlamp protocol. The proposed protocol exploits dedicated instructions to control many LEDs simultaneously, so it can control much more LEDs than conventional control buses although it is basically based on I2C bus. It is designed and verified in Verilog HDL. Simulation results show that HLCP can control LED matrix headlamp more efficiently than I2C and SPI.

LED 매트릭스를 사용하는 차량용 헤드램프에서 LED의 디지털 제어는 I2C, SPI 등의 저가격 저속 직렬 버스를 사용하여 왔으나 헤드램프의 해상도가 증가하면서 LED 제어를 위해 전송해야 하는 데이터의 양이 너무 많아 제어 버스의 전송 능력을 초과하게 된다. 본 논문에서는 새로운 차량용 LED 매트릭스 헤드램프 제어 프로토콜인 HLCP(Headlamp LED Control Protocol)을 제안한다. 제안하는 프로토콜은 많은 LED를 하나의 명령어로 제어하는 명령어를 사용하여 I2C 버스를 거의 그대로 사용하면서도 훨씬 많은 LED를 제어할 수 있다. 제안하는 프로토콜을 수행하는 컨트롤러를 Verilog HDL로 구현 및 검증하였으며 시뮬레이션 결과 LED 매트릭스 헤드램프를 I2C나 SPI보다 효율적으로 제어할 수 있음을 확인하였다.

Keywords

Acknowledgement

This work was supported by the R&D Program of the Ministry of Trade, Industry, and Energy (MOTIE) and Korea Evaluation Institute of Industrial Technology (KEIT). (20012624). It was also supported by the R&D Program of the Ministry of Trade, Industry, and Energy (MOTIE) and Korea Evaluation Institute of Industrial Technology (KEIT). (RS-2022-00154973, RS-2022-00155731)

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