Heat resistive particles for particle-based displays and fabrication methods thereof

• US 8,867,119 B2
• Filed: 10/05/2012
• Issued: 10/21/2014
• Est. Priority Date: 10/07/2011
• Status: Expired due to Fees

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Hwang, Jiunn-Jye, Juang, Jung-Yang, Liang, Rong-Chang
• Primary Examiner(s): Jones, James
• Application Number:
  US13/646,214
• Publication Number:
  US 20130088768A1
• Time in Patent Office: 746 Days
• Field of Search: 359/296
• US Class Current: 359/296
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 5/0041 Optical brightening agents, organic pigments
• CPC Class Codes: C08K 5/01 Hydrocarbons C08K5/0091 takes precedence
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 2001/1678 characterised by the composition or particle type
• CPC Class Codes: G02F 2203/11 involving infrared radiation
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]

Abstract

A heat resistive particle for a particle-based display and a fabrication method thereof are provided. The heat resistive particle includes a near infrared absorption resistive additive mixed with a polymer resin, having a relative absorption ratio at a near infrared light wavelength range of at least less than 50% based on the maximal absorptivity at a visible light wavelength range. The method includes mixing a near infrared absorption resistive additive with a polymer resin to form a plurality of heat resistive particles by a chemical synthesis or a pulverization method. Further, a switchable particle-based display is provided, having a plurality of display units, wherein each display unit includes one or more cells. A plurality of particles is filled into the one or more cells of each display unit, wherein at least a part of the particles includes the heat resistive particles.

Claims

1. A heat resistive particle for a particle-based display, comprising:

a polymer resin; and

a near infrared absorption resistive additive mixed with the polymer resin,

wherein the heat resistive particle has a relative absorption ratio at a near infrared light wavelength range of at least less than 50% based on the maximal absorptivity at a visible light wavelength range.

2. The heat resistive particle of claim 1, wherein the polymer resin is 98-50% by weight and the near infrared absorption resistive additive is 1-20% by weight.

3. The heat resistive particle of claim 1, wherein the near infrared absorption resistive additive comprises a near infrared transparent colorant or a near infrared reflective colorant.

4. The heat resistive particle of claim 3, wherein the near infrared transparent colorant comprises an organic material selected from a group consisting of black perylene-based pigment, anthraquinone, phthalocyanine, perinone, perylene, indigo, thioindigo, dioxazine, quinacridone, isoindolinone, diketopyrrolopyrrole, azomethine, azo, the derivatives thereof and the combinations thereof.

5. The heat resistive particle of claim 3, wherein the near infrared reflective colorant comprises an inorganic powder mixed with a dye or a pigment, and the inorganic powder has a refractive index of 2.0 to 4.0 at a near infrared light wavelength range.

6. The heat resistive particle of claim 5, wherein the inorganic powder is selected from a group consisting of titanium dioxide, zinc oxide, aluminum oxide, silica and the combinations thereof.

7. The heat resistive particle of claim 5, wherein the dye or the pigment is selected from a group consisting of copper oxide, manganese dioxide, iron oxide, black perylene-based pigment, anthraquinone, phthalocyanine, perinone, perylene, indigo, thioindigo, dioxazine, quinacridone, isoindolinone, diketopyrrolopyrrole, azomethine, azo, the derivatives thereof and the combinations thereof.

8. The heat resistive particle of claim 1, having a relative absorption ratio at a near infrared light wavelength range of less than 35% based on the maximal absorptivity at a visible light wavelength range.

9. The heat resistive particle of claim 1, having a color of black, cyan, blue, green, red, magenta or yellow.

10. The heat resistive particle of claim 9, wherein the black and the cyan heat resistive particles have a relative absorption ratio at a near infrared light wavelength range of less than 20% based on the maximal absorptivity at a visible light wavelength range.

11. The heat resistive particle of claim 9, wherein the blue, the green, the red, the magenta and the yellow heat resistive particles have a relative absorption ratio at a near infrared light wavelength range of less than 25% based on the maximal absorptivity at a visible light wavelength range.

12. The heat resistive particle of claim 1, further comprising a light stabilizer and a charge controlling agent, wherein the light stabilizer is 0-10% by weight and the charge controlling agent is 0-25% by weight.

13. The heat resistive particle of claim 1, wherein the polymer resin is selected from a group consisting of styrene resin, polyamide resin, acrylic resin, polyurethane resin, urea resin, polyester resin, epoxy resin, melamine resin, phenol resin, the derivatives thereof and the combinations thereof.

14. The heat resistive particle of claim 1, having a diameter of 0.01-20 μ

m.

15. A switchable particle-based display, having a plurality of display units spatially arranged in a matrix form, wherein each display unit comprises one or more cells, comprising:

a plurality of particles filled into the one or more cells of each display unit,

wherein at least a part of the particles comprises the heat resistive particles of claim 1.

16. The switchable particle-based display of claim 15, comprising an electrophoretic display or a dry powder type display.

17. The switchable particle-based display of claim 16, wherein the electrophoretic display comprises the plurality of particles suspended in a dielectric solvent.

18. The switchable particle-based display of claim 16, wherein the dry powder type display comprises the plurality of particles floating in air.

19. A method of fabricating heat resistive particles for a particle-based display, comprising:

mixing a near infrared absorption resistive additive with a polymer resin to form a plurality of heat resistive particles by a chemical synthesis method or a pulverization method,

wherein the heat resistive particles have a relative absorption ratio at a near infrared light wavelength range of at least less than 50% based on the maximal absorptivity at a visible light wavelength range.

20. The method of claim 19, wherein the pulverization method comprises a ball milling, a bead milling or a jet milling process.

21. The method of claim 19, wherein the chemical synthesis method comprises emulsion polymerization, suspension polymerization or dispersion polymerization.

22. The method of claim 19, wherein the polymer resin is selected from a group consisting of styrene resin, polyamide resin, acrylic resin, polyurethane resin, urea resin, polyester resin, epoxy resin, melamine resin, phenol resin, the derivatives thereof and the combinations thereof.

23. The method of claim 19, wherein the near infrared absorption resistive additive comprises a near infrared transparent colorant or a near infrared reflective colorant.

24. The method of claim 23, wherein the near infrared transparent colorant comprises an organic material selected from a group consisting of black perylene-based pigment, anthraquinone, phthalocyanine, perinone, perylene, indigo, thioindigo, dioxazine, quinacridone, isoindolinone, diketopyrrolopyrrole, azomethine, azo, the derivatives thereof and the combinations thereof.

25. The method of claim 23, wherein the near infrared reflective colorant comprises an inorganic powder mixed with a dye or a pigment, and wherein the inorganic powder has a refractive index of 2.0 to 4.0 at a near infrared light wavelength range.

26. The method of claim 25, wherein the inorganic powder is selected from a group consisting of titanium dioxide, zinc oxide, aluminum oxide, silica and the combinations thereof.

27. The method of claim 25, wherein the dye or the pigment is selected from a group consisting of copper oxide, manganese dioxide, iron oxide, black perylene-based pigment, anthraquinone, phthalocyanine, perinone, perylene, indigo, thioindigo, dioxazine, quinacridone, isoindolinone, diketopyrrolopyrrole, azomethine, azo, the derivatives thereof and the combinations thereof.

28. The method of claim 19, wherein the heat resistive particles have a diameter of 0.01-20 μ

m.

29. The method of claim 19, wherein the color of the heat resistive particles is black, cyan, blue, green, red, magenta or yellow.

30. The method of claim 29, wherein the black and the cyan heat resistive particles have a relative absorption ratio at a near infrared light wavelength range of less than 20% based on the maximal absorptivity at a visible light wavelength range.

31. The method of claim 29, wherein the blue, the green, the red, the magenta and the yellow heat resistive particles have a relative absorption ratio at a near infrared light wavelength range of less than 25% based on the maximal absorptivity at a visible light wavelength range.

32. The method of claim 19, further comprising mixing a light stabilizer and a charge controlling agent with the polymer resin, wherein the light stabilizer is 0-10% by weight and the charge controlling agent is 0-25% by weight.

33. A heat resistive particle for a particle-based display, comprising:

a polymer resin; and

a near infrared absorption resistive additive mixed with the polymer resin,

wherein the near infrared absorption resistive additive comprises a near infrared reflective colorant including an inorganic powder mixed with a dye or a pigment, the inorganic powder has a refractive index of 2.0 to 4.0 at a near infrared light wavelength range, and

wherein the heat resistive particle has a relative absorption ratio at a near infrared light wavelength range of at least less than 50% based on the maximal absorptivity at a visible light wavelength range.