Patent ID: 9213184
Filing Date: 2015-12-15
Classification: G02B,G03B,G09G,H04N

Abstract:
1. A micro projector device, comprising: a MEMS mirror, having a first portion and a second portion, the first portion pivots to the second portion, and the first portion oscillates in relation to the second portion; a laser source module, generating a laser light to a reflection plane of the first portion of the MEMS mirror; a detection module, detecting an equivalent capacitance value between the first portion and the second portion; and a control unit, determining the relative position between the first portion and the second portion according to the equivalent capacitance value, and providing image data to the laser source module according to the relative position, wherein the reflection plane of the first portion is configured to reflect the laser light from the laser source module to a projection plane, wherein the detection module further comprises an adder circuit, wherein the adder circuit comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first DC-voltage source and a first capacitor, wherein a first terminal of the first resistor receives a scan driving signal, a second terminal of the first resistor is connected to a negative input terminal of the first operational amplifier, a first terminal of the second resistor receives a high-frequency carrier signal, a second terminal of the second resistor is connected to the negative input terminal of the first operational amplifier, a first terminal of the third resistor is connected to the negative input terminal of the first operational amplifier, a second terminal of the third resistor is connected to an output terminal of the first operational amplifier, a first terminal of the fourth resistor is connected to a positive input terminal of the first operational amplifier, a second terminal of the fourth resistor is connected to a first terminal of the first capacitor and a positive voltage terminal of the first DC-voltage source, a second terminal of the first capacitor and a negative voltage terminal of the first DC-voltage source are connected to ground, the output terminal of the first operational amplifier is connected to a first terminal of the fifth resistor, a second terminal of the fifth resistor is connected to a positive input terminal of the second operational amplifier and a first driving electrode of the first portion of the MEMS mirror, and a second driving electrode of the second portion of the MEMS mirror is connected to ground.