DISPLAY PANEL, DISPLAY SYSTEM, PORTABLE TERMINAL AND ELECTRONIC DEVICE

• US 20120140147A1
• Filed: 05/25/2010
• Published: 06/07/2012
• Est. Priority Date: 10/09/2009
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Satoh, Eiji, Asaoka, Yasushi, Fujiwara, Sayuri, Deguchi, Kazuhiro
• Application Number:
  US13/389,944
• Publication Number:
  US 20120140147A1
• Time in Patent Office: Days
• US Class Current: 349/62
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/13347 working in reverse mode, i.e. clear in the off-state and scattering in the on-state
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: G03B 21/604 Polarised screens

Abstract

To provide a display panel that can achieve a transparent state having high panel transmittance and that can carry out a display in which a figure looks as if it has popped up in the air, a display panel disclosed includes a PDLC panel (10) including: a substrate (20) including a wire; a substrate (30) provided so as to face the substrate (20); and a PDLC layer (40) provided between the substrate (20) and the substrate (30), the PDLC layer (40) including PDLC which is switched between a light transmitting state and a light scattering state in correspondence with the presence or absence of an electric field applied to the PDLC layer (40), the display panel including no colored layer, the display panel selectively forming a light transmitting region and a light scattering region in response to control of the presence or absence of the electric field applied to the PDLC layer (40), at least one of (i) a reflectance reducing layer for reducing direct reflection of external light by the wire, (ii) a light blocking layer covering the wire, and (iii) the PDLC layer (40) being placed in front of the wire as viewed from the observer.

Claims

1. A display panel comprising:

a first substrate including a wire;

a second substrate provided so as to face the first substrate; and

a display medium provided between the first substrate and the second substrate, the display medium being switched between a light transmitting state and a light scattering state in correspondence with presence or absence of an electric field applied to the display medium,

the display panel including no colored layer,

the display panel selectively forming a light transmitting region and a light scattering region in response to control of the presence or absence of the electric field applied to the display medium,

at least one of a reflectance reducing layer for reducing direct reflection of external light by the wire, a light blocking layer covering the wire, and the display medium being placed in front of the wire as viewed from an observer.

2. The display panel according to claim 1,

wherein:

an anti-reflection film is provided on a surface of at least one of the first substrate and the second substrate.

4. The display panel according to claim 1, wherein:

the first substrate is an active matrix substrate including a plurality of wires and a plurality of switching elements both provided in a matrix and;

the display panel selectively forms the light transmitting region and the light scattering region in response to control, by use of the switching elements, of the presence or absence of the electric field applied to the display medium.

5. A display system comprising:

a display device including the display panel according to claim 1; and

a light source device for projecting a monochrome or multicolor light beam onto the display panel.

6. The display system according to claim 5,

wherein:

the light source device projects the light beam onto only the light scattering region formed by the display panel.

7. The display system according to claim 5,

wherein:

the light source device projects the light beam onto the display panel from a side on which a back surface of the display panel is present.

8. The display system according to claim 5,

wherein:

the light source device projects the light beam onto the display panel at an incidence angle that is not greater than 80 degrees at a maximum.

9. The display system according to claim 8,

wherein:

the incidence angle is not greater than a Brewster'"'"'s angle at the maximum.

10. The display system according to claim 5,

wherein:

the display medium is polymer dispersed liquid crystal or polymer network liquid crystal each of which (i) includes a polymer and liquid crystal droplets independent of or continuous with one another and (ii) achieves the light transmitting state when the electric field is being applied to the display medium and achieves the light scattering state when no electric field is being applied to the display medium;

the first substrate and the second substrate have respective surfaces each facing the display medium which surface has been subjected to an alignment process, the liquid crystal droplets being arranged along a direction of the alignment process for the first substrate and the second substrate in parallel to a substrate surface; and

the light source device is placed so that in a case where the light source device projects the light beam onto the display panel in a form of a planar projection, the light beam projected by the light source device enters the display panel in a direction that is perpendicular to a direction in which the liquid crystal droplets are arranged.

11. The display system according to claim 5,

wherein:

the display medium is polymer dispersed liquid crystal or polymer network liquid crystal each of which (i) includes a polymer and liquid crystal droplets independent of or continuous with one another and (ii) achieves the light scattering state when the electric field is being applied to the display medium and achieves the light transmitting state when no electric field is being applied to the display medium;

the first substrate and the second substrate have respective surfaces each facing the display medium which surface has been subjected to an alignment process, the liquid crystal droplets including liquid crystal molecules having respective major axes arranged along a direction of the alignment process for the first substrate and the second substrate in parallel to a substrate surface; and

the light source device is placed so that in a case where the light source device projects the light beam onto the display panel in a form of a planar projection, the light beam projected by the light source device enters the display panel in a direction that is perpendicular to the respective major axes of the liquid crystal molecules.

12. The display system according to claim 5,

wherein:

the light source device projects the light beam onto the display panel only in a case where a color display is carried out; and

in a case where a monochrome display is carried out, the light source device projects no light beam, and a display is carried out in such a manner that the electric field is selectively applied to the display medium so as to selectively achieve the light scattering state and the light transmitting state.

13. The display system according to claim 5,

wherein:

the display system includes a plurality of the display panel; and

the display panels are arranged in a depth direction as viewed from the observer.

14. The display system according to claim 13,

wherein:

the display panels are arranged such that a larger display panel is located at a position farther in the depth direction away from the observer.

15. The display system according to claim 5,

wherein:

the display panel has a curved panel surface.

16. The display system according to claim 5,

wherein:

the display system includes a plurality of the light source device;

the light source devices projects respective light beams having colors different from one another.

17. The display system according to claim 5,

wherein:

the light source device is provided with a filter having a gray scale that is continuously varied.

18. A portable terminal comprising:

the display system according to claim 5.

19. The portable terminal according to claim 18,

wherein:

the display device and the light source device both included in the display system are provided as separate devices independent of each other.

20. An electronic device comprising:

the display system according to claim 5.

3. A display panel comprising:

a first substrate including a wire;

a second substrate provided so as to face the first substrate; and

a display medium provided between the first substrate and the second substrate, the display medium being switched between a light transmitting state and a light scattering state in correspondence with presence or absence of an electric field applied to the display medium,

the display panel including no colored layer,

the display panel selectively forming a light transmitting region and a light scattering region in response to control of the presence or absence of the electric field applied to the display medium,

an anti-reflection film being provided on a surface of at least one of the first substrate and the second substrate.

21. The display panel according to claim 3, wherein:

the first substrate is an active matrix substrate including a plurality of wires and a plurality of switching elements both provided in a matrix and;

the display panel selectively forms the light transmitting region and the light scattering region in response to control, by use of the switching elements, of the presence or absence of the electric field applied to the display medium.

22. A display system comprising:

a display device including the display panel according to claim 3; and

a light source device for projecting a monochrome or multicolor light beam onto the display panel.

23. The display system according to claim 22,

wherein:

the light source device projects the light beam onto only the light scattering region formed by the display panel.

24. The display system according to claim 22,

wherein:

the light source device projects the light beam onto the display panel from a side on which a back surface of the display panel is present.

25. The display system according to claim 22,

wherein:

the light source device projects the light beam onto the display panel at an incidence angle that is not greater than 80 degrees at a maximum.

26. The display system according to claim 25,

wherein:

the incidence angle is not greater than a Brewster'"'"'s angle at the maximum.

27. The display system according to claim 22,

wherein:

the display medium is polymer dispersed liquid crystal or polymer network liquid crystal each of which (i) includes a polymer and liquid crystal droplets independent of or continuous with one another and (ii) achieves the light transmitting state when the electric field is being applied to the display medium and achieves the light scattering state when no electric field is being applied to the display medium;

the first substrate and the second substrate have respective surfaces each facing the display medium which surface has been subjected to an alignment process, the liquid crystal droplets being arranged along a direction of the alignment process for the first substrate and the second substrate in parallel to a substrate surface; and

the light source device is placed so that in a case where the light source device projects the light beam onto the display panel in a form of a planar projection, the light beam projected by the light source device enters the display panel in a direction that is perpendicular to a direction in which the liquid crystal droplets are arranged.

28. The display system according to claim 22,

wherein:

the display medium is polymer dispersed liquid crystal or polymer network liquid crystal each of which (i) includes a polymer and liquid crystal droplets independent of or continuous with one another and (ii) achieves the light scattering state when the electric field is being applied to the display medium and achieves the light transmitting state when no electric field is being applied to the display medium;

the first substrate and the second substrate have respective surfaces each facing the display medium which surface has been subjected to an alignment process, the liquid crystal droplets including liquid crystal molecules having respective major axes arranged along a direction of the alignment process for the first substrate and the second substrate in parallel to a substrate surface; and

the light source device is placed so that in a case where the light source device projects the light beam onto the display panel in a form of a planar projection, the light beam projected by the light source device enters the display panel in a direction that is perpendicular to the respective major axes of the liquid crystal molecules.

29. The display system according to claim 22,

wherein:

the light source device projects the light beam onto the display panel only in a case where a color display is carried out; and

in a case where a monochrome display is carried out, the light source device projects no light beam, and a display is carried out in such a manner that the electric field is selectively applied to the display medium so as to selectively achieve the light scattering state and the light transmitting state.

30. The display system according to claim 22,

wherein:

the display system includes a plurality of the display panel; and

the display panels are arranged in a depth direction as viewed from the observer.

31. The display system according to claim 30,

wherein:

the display panels are arranged such that a larger display panel is located at a position farther in the depth direction away from the observer.

32. The display system according to claim 22,

wherein:

the display panel has a curved panel surface.

33. The display system according to claim 22,

wherein:

the display system includes a plurality of the light source device;

the light source devices projects respective light beams having colors different from one another.

34. The display system according to claim 22,

wherein:

the light source device is provided with a filter having a gray scale that is continuously varied.

35. A portable terminal comprising:

the display system according to claim 3.

36. The portable terminal according to claim 35,

wherein:

the display device and the light source device both included in the display system are provided as separate devices independent of each other.

37. An electronic device comprising:

the display system according to claim 3.