Multi-fluid elements device with controllable fluid level by means of matrix addressing

• US 6,473,492 B2
• Filed: 11/08/2001
• Issued: 10/29/2002
• Est. Priority Date: 11/09/2000
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Young, Edward Willem Albert, Prins, Menno Willem Jose, Van Velzen, Jeroen
• Primary Examiner(s): Church, Craig E.
• Application Number:
  US10/008,215
• Publication Number:
  US 20020080920A1
• Time in Patent Office: 355 Days
• Field of Search: 378/156-159
• US Class Current: 378/158
• CPC Class Codes: G02B 26/005 based on electrowetting
• CPC Class Codes: G21K 1/10 Scattering devices; Absorbing devices; Ionising radiation filters

Abstract

Fluid element device including fluid elements arranged in a matrix configuration having rows and columns with the level of fluid in each fluid element being controllable by electric force. The fluid elements include capillary tubes having electrode segments electrically insulated from one another such that each segments is receivable of a different voltage. A first voltage delivery circuit applies voltage to selected fluid elements in one or more rows of fluid elements and a second voltage delivery circuit applies voltage to selected fluid elements in one or more columns of fluid elements. The fluid level rises in the selected fluid elements to which voltage is applied by both the first and second voltage delivery circuits. The capillary tubes are structured and arranged such that the level of fluid in the selected elements can be retained independent of the application of voltage by the first and second voltage delivery circuits.

Claims

1. A fluid element device comprising:

a plurality of fluid elements arranged in a matrix configuration having rows and columns, the level of fluid in each of said fluid elements being controllable by means of an electric force, said fluid elements comprising capillary tubes, each of said capillary tubes comprising a plurality of electrode segments electrically insulated from one another such that each of said segments is receivable of a different electric voltage;

first means for applying an electric force to a number of selected fluid elements in one or more of said rows of fluid elements; and

second means for applying an electric force to a number of selected fluid elements in one or more of said columns of fluid elements such that the fluid level rises in the selected fluid elements to which an electric force is applied by both said first means and said second means.

2. The device according to claim 1, wherein said electrode segments of each of said capillary tubes are arranged inside said capillary tubes.

3. The device according to claim 1, wherein said electrode segments each comprise a coating layer of an electrically conducting material.

4. The device according to claim 1, wherein said electrode segments of at least one of said capillary tubes extend in a longitudinal direction of said capillary tube.

5. The device according to claim 1, wherein said electrode segments of at least one of said capillary tubes extend in a transverse direction of said capillary tube.

6. The device according to claim 1, wherein at least one of said electrode segments is coupled to said first means.

7. The device according to claim 1, wherein at least one of said electrode segments is coupled to said second means.

8. The device according to claim 1, further comprising third means for applying an electric force to at least one of said electrode segments such that when the level of fluid in said capillary tube reaches said electrode segment, application of a voltage of a predetermined value to said electrode segment by said third means will maintain the level of fluid in said capillary tube independent of the application of an electric force by said first and second means to thereby provide said capillary tube with a memory effect with said electrode segment constituting a memory electrode.

9. An X-ray filter comprising a device according to claim 1, wherein said capillary tubes are at least partially filled with an X-ray absorbing fluid.

10. The device according to claim 1, wherein said plurality of electrode segments in at least one of said capillary tubes comprises sequentially arranged first, second and third electrode segments.

11. The device according to claim 10, wherein said first electrode segment is coupled to said first means and said second electrode segment is coupled to said second means, said first and second means being controllable such that upon application of voltages of predetermined values to both said first and second electrode segments by said first and second means, the fluid in said capillary tube will rise above said first and second electrode segments.

12. The device according to claim 11, further comprising third means for applying an electric force to said third electrode segment such that when the level of fluid in said capillary tube reaches said third electrode segment, application of a voltage of a predetermined value to said third electrode segment will maintain the level of fluid in said capillary tube independent of an electric force applied by said first and second means to thereby provide said capillary tube with a memory effect with said third electrode segment constituting a memory electrode.

13. The device according to claim 10, wherein said second electrode segment is coupled to said first or second means, whereby upon application of a voltage to the fluid in said capillary tube above a threshold relative to the voltage applied to said second electrode segment, the fluid will rise above a gap between said first and second electrode segments.

14. The device according to claim 13, further comprising third means for applying an electric force to said third electrode segment such that when the level of fluid in said capillary tube reaches said third electrode segment, application of a voltage of a predetermined value to said third electrode segment will maintain the level of fluid in said capillary tube independent of the application of an electric force by said first and second means to thereby provide said capillary tube with a memory effect with said third electrode segment constituting a memory electrode.

15. The device according to claim 1, wherein said electrode segments are spaced from one another to define a gap between each adjacent pair of electrode segments.

16. The device according to claim 1, wherein said plurality of electrode segments comprises at least first and second electrode segments, said first electrode segment being coupled to said first means and said second electrode segment being coupled to said second means.

17. An X-ray examination device comprising:

an X-ray source;

an X-ray detector spaced from said X-ray source; and

an X-ray filter arranged between said X-ray source and said X-ray detector, said X-ray filter comprising

a reservoir for storing X-ray absorbing fluid;

a plurality of fluid elements arranged in a matrix configuration having rows and columns, said fluid elements being in fluid communication with said reservoir, the level of fluid in each of said fluid elements being controllable by means of an electric force, said fluid elements comprising capillary tubes, each of said capillary tubes comprising a plurality of electrode segments electrically insulated from one another such that each of said segments is receivable of a different electric voltage;

first means for applying an electric force to a number of selected fluid elements in one or more of said rows of fluid elements; and

second means for applying an electric force to a number of selected fluid elements in one or more of said columns of fluid elements such that the fluid level rises in the selected fluid elements to which an electric force is applied by both said first means and said second means.

18. A fluid element device, comprising:

a plurality of fluid elements arranged in a matrix configuration having rows and columns, the level of fluid in each of said fluid elements being controllable by means of an electric force;

first means for applying an electric force to a number of selected fluid elements in one or more of said rows of fluid elements;

second means for applying an electric force to a number of selected fluid elements in one or more of said columns of fluid elements such that the fluid level rises in the selected fluid elements to which an electric force is applied by both said first means and said second means; and

fluid level retention means for maintaining the level of fluid in the selected elements, after the fluid has risen by the application of an electric force applied by both said first means and said second means, at the elevated level independent of the application of an electric force by said first means and said second means.

19. The device according to claim 18, wherein said fluid elements comprise capillary tubes, each of said capillary tubes comprising a plurality of electrode segments electrically insulated from one another such that each of said segments is receivable of a different electric voltage.

20. The device according to claim 19, wherein said fluid level retention means comprise one of said electrode segments and third means for applying an electric force to said one of said electrode segments.