According to the characteristics of green and high brightness OLED-on-silicon display, the brightness adjustment circuit was studied to meet the application requirements of high and low temperature environments and wide range brightness. The 2.4 cm green and high bright OLED-on-silicon display was selected as the display module, and a wide range brightness adjustment circuit with temperature-brightness compensation was designed. The brightness curve was optimized to meet the application requirements of brightness consistency at high and low temperature environments. Finally, the photoelectric test was carried out to verify the effectiveness of design.