A display device comprising: a laser beam emitter configured to emit a laser beam; a slow-scan mirror; a slow-scan microelectromechanical, MEMS, control; a MEMS fast-scan mirror, the MEMS fast-scan mirror being an electrostatic MEMS fast-scan mirror; a fast-scan MEMS control, wherein the slow-scan MEMS control and the fast-scan MEMS control are respectively configured to drive the slow-scan mirror and the MEMS fast-scan mirror to reflect the laser beam onto a display region to generate an image; wherein the fast-scan MEMS control comprises: a first control loop for maintaining a resonance actuation for the MEMS fast-scan mirror, a second control loop for maintaining an open angle for the MEMS fast-scan mirror, and a third control loop configured to receive a feedback signal from the MEMS fast-scan mirror indicating a current resonant frequency of the MEMS fast-scan mirror, wherein the third control loop adjusts a bias of a driving signal to the MEMS fast-scan mirror to reduce an error between a target resonant frequency and the current resonant frequency; and wherein adjusting the bias includes: decreasing the bias if the current resonant frequency is below the target resonant frequency and if the bias is positive; increasing the bias if the current resonant frequency is below the target resonant frequency and if the bias is negative; increasing the bias if the current resonant frequency is above the target resonant frequency and if the bias is positive; and decreasing the bias if the current resonant frequency is above the target resonant frequency and if the bias is negative. a laser beam emitter configured to emit a laser beam; a slow-scan mirror; a slow-scan microelectromechanical, MEMS, control; a MEMS fast-scan mirror, the MEMS fast-scan mirror being an electrostatic MEMS fast-scan mirror; a fast-scan MEMS control, wherein the slow-scan MEMS control and the fast-scan MEMS control are respectively configured to drive the slow-scan mirror and the MEMS fast-scan mirror to reflect the laser beam onto a display region to generate an image; wherein the fast-scan MEMS control comprises: a first control loop for maintaining a resonance actuation for the MEMS fast-scan mirror, a second control loop for maintaining an open angle for the MEMS fast-scan mirror, and a third control loop configured to receive a feedback signal from the MEMS fast-scan mirror indicating a current resonant frequency of the MEMS fast-scan mirror, a first control loop for maintaining a resonance actuation for the MEMS fast-scan mirror, a second control loop for maintaining an open angle for the MEMS fast-scan mirror, and a third control loop configured to receive a feedback signal from the MEMS fast-scan mirror indicating a current resonant frequency of the MEMS fast-scan mirror, wherein the third control loop adjusts a bias of a driving signal to the MEMS fast-scan mirror to reduce an error between a target resonant frequency and the current resonant frequency; and wherein adjusting the bias includes: decreasing the bias if the current resonant frequency is below the target resonant frequency and if the bias is positive; increasing the bias if the current resonant frequency is below the target resonant frequency and if the bias is negative; increasing the bias if the current resonant frequency is above the target resonant frequency and if the bias is positive; and decreasing the bias if the current resonant frequency is above the target resonant frequency and if the bias is negative.