Mirror driving method and apparatus of micro-mirror array

• US 5,748,172 A
• Filed: 01/25/1996
• Issued: 05/05/1998
• Est. Priority Date: 02/25/1995
• Status: Expired due to Term

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lee, Chul-woo, Cho, Han-ki, Song, Ci-moo
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): TRAN, VUI
• Application Number:
  US08/591,785
• Time in Patent Office: 831 Days
• Field of Search: 345/7-9, 345/86-87, 345/90, 345/84, 345/85, 345/108, 345/111
• US Class Current: 345/111
• CPC Class Codes: G02B 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: G02B 26/085 the reflecting means being moved or deformed by electromagnetic means
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]

Abstract

In a mirror driving method of a micro-mirror array and an apparatus thereof, each of a plurality of mirrors is pivotally supported by hinges fixed to a substrate, and a permanent magnet is attached beneath the substrate to form a magnetic field about the mirrors. A coiled conductive layer is formed on the rear surface of each mirror to be selectively applied with current according to a video signal, and the selected mirror pivots in correspondence with the electrostatic force operative between the conductive layer to which the current is applied and the magnetic field. Thus, a light beam irradiating the micro-mirror array can be modulated according to an image, and mass production is made possible due to a simple structure which provides for a stable driving action.

Claims

1. A mirror driving method of a micro-mirror array provided with a plurality of mirror members each of which is pivotally supported, said method comprising the steps of:

(a) applying a magnetic field uniformly throughout to said plurality of mirror members; and

(b) selecting a mirror member among said plurality of mirror members according to an image signal and allowing an electrical current to flow through the selected mirror member by applying electric current to conductive means attached to one surface of each mirror member,

wherein the selected mirror member is pivoted by means of an electromagnetic force between said applied magnetic field and electrical current so as to deflect incident light.

2. A mirror driving method of a micro-mirror array as claimed in claim 1, wherein said step (a) is performed by arranging a permanent magnet having a magnetic pole surface to form a magnetic field with respect to said plurality of mirror members.

3. A mirror driving method of a micro-mirror array as claimed in claim 1, wherein said step (a) is performed by arranging an electromagnet having a magnetic pole surface to form a magnetic field with respect to said plurality of mirror members.

4. A mirror driving method of a micro-mirror array as claimed in claim 1, wherein said conductive means comprises at least one coil attached to one surface of each mirror member.

5. A mirror driving method of a micro-mirror array as claimed in claim 1, wherein said conductive means comprises a coiled conductive pattern formed on one surface of each mirror member wherein each mirror member is coated with an electrically conductive material patterned into a coil shape.

6. A mirror driving apparatus of a micro-mirror array provided with a plurality of mirror members each of which is pivotally supported, said apparatus comprising:

magnetic-field-forming means for applying a magnetic field to said plurality of mirror members; and

conductive means attached to one surface of said mirror for allowing an electric current to flow through each of said plurality of mirror members in order to generate magnetic flux lines linked with the magnetic field,

wherein each mirror member is pivoted by an electromagnetic force between said magnetic-field-forming means and conductive means.

7. A mirror driving apparatus of a micro-mirror array as claimed in claim 6, wherein said magnetic-field-forming means comprises a permanent magnet having a magnetic pole surface with respect to said plurality of mirror members.

8. A mirror driving apparatus of a micro-mirror array as claimed in claim 6, wherein said magnetic-field-forming means comprises an electromagnet having a magnetic pole surface with respect to said plurality of mirror members.

9. A mirror driving apparatus of a micro-mirror array as claimed in claim 6, wherein said conductive means comprises at least one coil attached to one surface of each mirror member.

10. A mirror driving apparatus of a micro-mirror array as claimed in claim 6, wherein said conductive means comprises at least one coiled conductive pattern formed on one surface of each mirror member wherein said mirror member is coated with an electrically conductive material patterned into a coil shape.

11. A mirror driving apparatus of a micro-mirror array as claimed in claim 10, wherein said mirror member includes an insulating layer for insulating a jumper pattern over said at least one coiled conductive pattern.

12. A mirror driving apparatus of a micro-mirror array provided with a plurality of mirror members each of which is pivotally supported, said apparatus comprising:

a common substrate;

a plurality of hinges for pivotally supporting said plurality of mirror members on said common substrate, respectively;

a permanent magnet attached beneath said common substrate and having a magnetic pole surface with respect to said plurality of mirror members;

a coiled conductive pattern formed on each one surface of said plurality of mirror members; and

means for applying electric current to said coiled conductive pattern of the selected mirror member of said plurality of mirror members according to an image signal.

13. A mirror driving apparatus of a micro-mirror array in claim 12, wherein said coiled conductive pattern is formed on one surface of each mirror member wherein said mirror member is coated with an electrically conductive material patterned into a coil shape.

14. A mirror driving apparatus comprising:

a semiconductor substrate;

a mirror;

a pair of hinges on said substrate for pivotally supporting said mirror;

magnetic field forming means disposed beneath said substrate for applying a magnetic field to said mirror;

conductive means uniformly dispersed throughout one surface of said mirror for allowing an electric current to flow through said mirror in order to generate magnetic flux lines linked with the magnetic field; and

wherein said mirror is pivoted by an electromagnetic force between said magnetic field forming means and said conductive means.

15. A mirror driving apparatus as claimed in claim 14, wherein said magnetic field forming means comprises a permanent magnet having a magnetic pole surface with respect to said mirror.

16. A mirror driving apparatus as claimed in claim 14, wherein said magnetic field forming means comprises an electromagnet having a magnetic pole surface with respect to said mirror.

17. A mirror driving apparatus as claimed in claim 14, wherein said conductive means comprises at least one coil attached to one surface of said mirror.

18. A mirror driving apparatus as claimed in claim 14, wherein said conductive means comprises at least one coiled conductive pattern formed on one surface of said mirror wherein said mirror is coated with an electrically conductive material patterned into a coil shape.

19. A mirror driving apparatus as claimed in claim 14, wherein said mirror includes an insulating layer for insulating a jumper pattern over said at least one coiled conductive pattern.

20. A mirror driving apparatus as claimed in claim 14, wherein said mirror comprises a reflective film disposed on said mirror.

21. A mirror driving apparatus as claimed in claim 14, wherein said mirror comprises an insulating layer disposed on said conductive means.