Display apparatus having an active transflective device

• US 20100060825A1
• Filed: 09/03/2009
• Published: 03/11/2010
• Est. Priority Date: 09/08/2008
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Cha, Seung-nam, Jang, Jae-eun, Jung, Jae-eun, Jin, Yong-wan
• Application Number:
  US12/585,090
• Publication Number:
  US 20100060825A1
• Time in Patent Office: Days
• US Class Current: 349/86
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133557 Half-mirrors
• CPC Class Codes: G02F 1/133567 on the back side
• CPC Class Codes: G02F 1/13476 in which at least one liquid crystal cell or layer assumes a scattering state
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials

Abstract

A display apparatus includes an active transflective device and a device panel. The active transflective device is configured to electrically control light transmissivity and light reflectivity. The display panel is configured to form an image by modulating at least one of light reflected and light transmitted by the active transflective device.

Claims

1. A display apparatus comprising:

an active transflective device configured to electrically control light transmissivity and light reflectivity; and

a display panel configured to form an image by modulating at least one of light reflected and light transmitted by the active transflective device.

2. The display apparatus of claim 1, wherein the active transflective device is configured to reflect light when a voltage is not applied to the active transflective device.

3. The display apparatus of claim 2, wherein the active transflective device is configured to transmit light when a first voltage is applied to the active transflective device.

4. The display apparatus of claim 3, wherein the active transflective device is configured to transmit and reflect light when a second voltage is applied to the active transflective device.

5. The display apparatus of claim 1, wherein the display panel modulates light by controlling transmissivity of a liquid crystal layer of the display panel.

6. The display apparatus of claim 5, wherein the liquid crystal layer comprises a black dye and a polymer dispersed liquid crystal (PDLC).

7. The display apparatus of claim 1, wherein the display panel includes electrification particles for electrophoresis.

8. The display apparatus of claim 1, wherein the display panel includes electrowetting materials to modulate light.

9. The display apparatus of claim 1, wherein the display panel includes electrochromic materials to modulate light.

10. The display apparatus of claim 1, wherein the active transflective device includes a polymer dispersed liquid crystal (PDLC).

11. The display apparatus of claim 1, wherein the active transflective device includes a polymer dispersed liquid crystal (PDLC) having a nano structure material.

12. The display apparatus of claim 11, wherein the nano structure material includes a white paper.

13. The display apparatus of claim 11, wherein the nano structure material includes a scattering material having a plurality of nanopores.

14. The display apparatus of claim 13, wherein the scattering material includes aluminum oxide (Al₂O₃) or barium sulfate (BaSO₄).

15. The display apparatus of claim 11, wherein the nano structure material includes tube-type nanoparticles or nano wire-type nanoparticles.

16. The display apparatus of claim 15, wherein the nanoparticles include one of titanium dioxide (TiO₂), zinc oxide (ZnO), barium titanate (BaTiO₃), lead titanate (PbTiO₃), lead zirconate titanate (Pb(Zr,Ti)O₃), aluminum oxide (Al₂O₃), silicon dioxide (SiO₂), barium oxide (BaO), strontium titanate (SrTiO₃), zinc sulfide (ZnS), and barium sulfate (BaSO₄).

17. A display apparatus comprising:

a backlight unit configured to transmit light on a first side of the display apparatus;

a display panel configured to form an image by modulating light;

an active transflective device configured to control an amount of light transmitted from the backlight unit to the display panel and an amount of light reflected by the active transflective device to the display panel.

18. The display apparatus of claim 17, wherein the active transflective device is configured to reflect light when a voltage is not applied to the active transflective device.

19. The display apparatus of claim 18, wherein the active transflective device is configured to transmit light when a first voltage is applied to the active transflective device.

20. The display apparatus of claim 19, wherein the active transflective device is configured to transmit and reflect light when a second voltage is applied to the active transflective device.

21. The display apparatus of claim 17, wherein the display panel modulates light by controlling transmissivity of a liquid crystal layer of the display panel.

22. The display apparatus of claim 21, wherein the liquid crystal layer comprises a black dye and a polymer dispersed liquid crystal (PDLC).

23. The display apparatus of claim 17, wherein the active transflective device comprises polymer dispersed liquid crystals (PDLC).

24. The display apparatus of claim 17, wherein the active transflective device is formed by inserting a nano structure material into polymer dispersed liquid crystal (PDLC).

25. The display apparatus of claim 24, wherein the nano structure material includes a white paper.

26. The display apparatus of claim 24, wherein the nano structure material includes a scattering material having a plurality of nanopores.

27. The display apparatus of claim 26, wherein the scattering material includes aluminum oxide (Al₂O₃) or barium sulfate (BaSO₄).

28. The display apparatus of claim 24, wherein the nano structure material includes tube-type nanoparticles or nano wire-type nanoparticles.

29. The display apparatus of claim 28, wherein the nano particles include one of titanium dioxide (TiO₂), zinc oxide (ZnO), barium titanate (BaTiO₃), lead titanate (PbTiO₃), lead zirconate titanate (Pb(Zr,Ti)O₃), aluminum oxide (Al₂O₃), silicon dioxide (SiO₂), barium oxide (BaO), strontium titanate (SrTiO₃), zinc sulfide (ZnS), and barium sulfate (BaSO₄).