Introduction: Nowadays, using digital displays in vehicles has become very common. Therefore, the reflection display screen issue as a virtual image on the vehicle's side windows at night is a controversial item in ergonomics position of designed display. Given the high importance of visual tasks, it is necessary to take ergonomics considerations into account during vehicle design process to achieve an optimal display position.
 

Methods: In current study, by identifying the factors affecting the placement of the central display inside the vehicle, and assigning level values for them, using the design of experiment statistical method with the full factorial way, the 243 runs were obtained from the combination of the identified factors using MINITAB version 18 software, and by implementing all the extracted runs, the amount of reflection from the central display on the side windows was subjected to statistical analysis of variance (ANOVA).
 

Results: significantly effective factors (including their interaction) on the response of the reflection of the virtual image on the critical vision zone and the total reflection on the driver's right and left side windows were identified, and the amount/direction of the factors' effect on the responses were analyzed by providing a linear regression model.
 

Conclusion: During the interior design process of the vehicle and when display packaging, the factors identified in this study can be used as a control tool to reduce or eliminate the concern of the amount of display reflection on the side windows in order to prevent driver's ergonomics problems while nighttime driving.