Display panel and display device using a display panel

• US 5,673,127 A
• Filed: 11/29/1994
• Issued: 09/30/1997
• Est. Priority Date: 12/01/1993
• Status: Expired due to Term

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Takahara, Hiroshi, Sannohe, Shinya
• Primary Examiner(s): Fahmy, Wael
• Assistant Examiner(s): Abraham, Fetsum
• Application Number:
  US08/350,033
• Time in Patent Office: 1,036 Days
• Field of Search: 359/40, 359/59, 359/62, 359/79, 359/81, 345/90
• US Class Current: 349/140
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 2203/02 reflective
• CPC Class Codes: G02F 2203/055 wavelength filtering
• CPC Class Codes: G03B 21/006 using LCD's
• CPC Class Codes: G03B 21/10 Projectors with built-in or built-on screen
• CPC Class Codes: G03B 21/14 Details
• CPC Class Codes: H04N 9/3105 for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10

Abstract

A liquid crystal display panel includes a counter substrate having a counter electrode and a multi-layered dielectric film both formed thereon, and an array substrate formed with pixel electrodes and thin-film transistors serving as switching elements. A layer of polymer dispersed liquid crystal material containing a UV-curable resin component and a liquid crystal component is sealingly sandwiched between the counter and array substrates. A light shielding film is formed over each thin-film transistor. The multi-layered dielectric film is a laminated structure of alternating thin-films of SiO₂ and HfO₂. Since the multi-layered dielectric film is of a nature capable of transmitting UV-rays of light therethrough, the UV-curable resin component positioned underneath the multi-layered dielectric film can be cured during the manufacture. Also, since the multi-layered dielectric film is of a nature capable of reflecting light of a visible region, it serves as a black matrix, reflecting the visible light modulated by the display panel. Black beads are used to keep the film thickness of the liquid crystal layer at a predetermined value. Preferably, a dielectric thin-film having a relative dielectric constant smaller than that of the liquid crystal material is formed on signal lines for transmitting signals to the thin-film transistors, to thereby accomplish an electromagnetic shield. Where color filters are to be formed on the pixel electrodes, those color filters may be formed on the signal lines to accomplish the electromagnetic shield.

Claims

1. A display panel which comprises:

a first electrode substrate formed with at least one first electrode thereon;

a second electrode substrate formed with at least one second electrode thereon;

a light modulating layer sandwiched between the first and second substrates; and

a multi-layered dielectric film formed in a predetermined pattern on at least one of the first and second electrode substrates for transmitting light of a particular wavelength region and for reflecting light of a wavelength region other than said particular wavelength region.

2. The display panel as claimed in claim 1, wherein said second electrode is a reflecting electrode, and further comprising a light absorbing film formed over the reflecting electrode, said light absorbing film being operable to absorb light of a particular wavelength.

3. The display panel as claimed in claim 1, wherein said multi-layered dielectric film is a laminated structure of at least one low refractive dielectric thin-film, having an index of refraction not greater than 1.7, and a high refractive dielectric thin-film having an index of refraction not smaller than 1.8, and wherein said low refractive dielectric thin-film is made of one selected from the group consisting of SiO₂ and MgF₂, said high refractive dielectric thin-film is made of one selected from the group consisting of HfO₂ and ZrO₂.

4. A display panel which comprises:

a first electrode substrate formed with at least one first electrode thereon;

a second electrode substrate formed with at least one second electrode thereon;

a light modulating layer sandwiched between the first and second substrates, said light modulating layer being a layer of polymer dispersed liquid crystal material containing a light-curable resin component and a nematic liquid crystal component and wherein the average particle size of liquid crystal droplets of the polymer dispersed liquid crystal material or the average pore size of a polymer network thereof is within the range of 0.5 to 3 μ

m; and

a multi-layered dielectric film formed in a predetermined pattern on at least one of the first and second electrode substrates and operable to transmit therethrough light of a predetermined wavelength region and reflect therefrom light of a wavelength region other than said predetermined wavelength region, said multi-layered dielectric film being a laminated structure in which low refractive dielectric thin-films and high refractive dielectric thin-films are alternately deposited one above the other.

5. The display panel as claimed in claim 4, wherein said first electrode substrate is formed with pixel electrodes in a matrix pattern and said second electrode substrate is formed with at least one counter electrode thereon and wherein said dielectric multi-layer is patterned in correspondence with the pixel electrodes.

6. The display panel as claimed in claim 4, wherein said light modulating layer is a layer of polymer dispersed liquid crystal material containing a light-curable acrylic resin component and a chloric nematic liquid crystal component and wherein the average particle size of liquid crystal droplets of the polymer dispersed liquid crystal material or the average pore size of a polymer network thereof is within the range of 0.5 to 3 μ

m.

7. The display panel as claimed in claim 4, further comprising a color filter formed over the pixel electrode and a dichroic color filter interposed between the pixel electrode and a pixel electrode neighboring said pixel electrode.

8. The display panel as claimed in claim 4, further comprising one of a transparent member and a concave lens is connected with at least one of the first and second electrode substrates through an optical coupling element.

9. A display panel which comprises:

a first substrate;

a second substrate;

a light modulating layer sandwiched between the first and second substrates and containing a light-curable resin; and

a pattern made of a multi-layered dielectric film formed on at least one of the first and second substrates, said pattern being formed at a general periphery of an image display area and being in the form of a laminated structure of at least one low refractive dielectric thin-film, having an index of refraction not greater than 1.7, and a high refractive dielectric thin-film having an index of refraction not smaller than 1.8.

10. A display panel which comprises:

a first substrate formed with a plurality of generally stripe-shaped first electrodes;

a second substrate formed with a plurality of generally stripe-shaped second electrodes;

a light modulating layer sandwiched between the first and second substrates and containing a light-curable resin; and

a multi-layered dielectric film formed in a predetermined pattern on at least one of the first and second substrates and adjacent the light modulating layer and operable to transmit therethrough light of a predetermined wavelength region and reflect therefrom light of a wavelength region other than said predetermined wavelength region, said multi-layered dielectric film being a laminated structure in which low refractive dielectric thin-films and high refractive dielectric thin-films are alternately deposited one above the other.

11. The display panel as claimed in claim 10, wherein said dielectric film is a laminated structure of at least one low refractive dielectric thin-film, having an index of refraction not greater than 1.7, and a high refractive dielectric thin-film having an index of refraction not smaller than 1.8, and wherein said low refractive dielectric thin-film is made of one selected from the group consisting of SiO₂ and MgF₂, said high refractive dielectric thin-film is made of one selected from the group consisting of HfO₂ and ZrO₂, said dielectric film being operable to transmit at least light of a particular wavelength within a ultraviolet region of light and reflect light of a particular wavelength within a visible region of light.

12. A display panel which comprises:

a first substrate formed with pixel electrodes in a matrix pattern;

a second substrate formed with at least one second electrode;

a layer of polymer dispersed liquid crystal material sandwiched between the first and second substrates and containing a light-curable resin component and a nematic liquid crystal component, said light-curable resin component being a light-curable acrylic resin having a fluorine group; and

an insulating film formed on at least one of the second electrode and one of the pixel electrodes that is held in contact with the layer of the polymer dispersed liquid crystal material, said insulating film being made of material having a specific resistance higher than that of the polymer dispersed liquid crystal material.

13. The display panel as claimed in claim 12, wherein said pixel electrode is a reflecting electrode made of a metallic thin-film, and further comprising a switching element disposed between the reflecting electrode and the first substrate.

14. A display panel which comprises:

a first substrate formed pixel electrodes in a matrix pattern;

a second substrate formed with at least one second electrode;

a layer of polymer dispersed liquid crystal material sandwiched between the first and second substrates and containing a light-curable resin component, which has a fluorine group, and a nematic liquid crystal component which is of a chloric system.

15. The display panel as claimed in claim 14, further comprising a switching element formed on the first substrate for applying a signal to the pixel electrode, and a light shielding film made of a resin and formed over the switching element.

16. The display panel as claimed in claim 15, further comprising a retaining means for retaining a space of separation between the pixel electrodes and the counter electrode to a predetermined distance, said retaining means being selected from the group consisting of black beads and black fibers.

17. A display panel which comprises:

a first substrate formed with pixel electrodes in a matrix pattern;

a second substrate formed with at least one transparent electrode;

a layer of polymer dispersed liquid crystal material sandwiched between the first and second substrates; and

a dielectric film or column located at least either between the neighboring pixel electrodes or on a counterelectrode facing between the pixel electrodes, made of material having a relative dielectric constant smaller than that of the polymer dispersed liquid crystal material and containing a substance capable of absorbing light scattered from the polymer dispersed liquid crystal layer.

18. The display panel as claimed in claim 17, wherein said dielectric film or column contain dyes capable of absorbing light scattered from the layer of polymer dispersed liquid crystal material, and further comprising a dielectric film formed at least either between the transparent electrode and the second substrate or between the transparent electrode and the layer of the polymer dispersed liquid crystal material, said dielectric film having a reflection preventing function.

19. A display panel which comprises:

a first substrate formed with pixel electrodes in a matrix pattern;

a second substrate formed with at least one transparent electrode;

a liquid crystal layer of polymer dispersed liquid crystal material sandwiched between the first and second substrates; and

a color filter formed over the pixel electrode and between the neighboring pixel electrodes; and

a color filter having at least two colors and laminated between the neighboring pixel electrodes.

20. The display panel as claimed in claim 19, wherein said pixel electrode is a reflecting electrode made of a metallic thin-film, and further comprising at least one layer of dielectric thin-film disposed at least either between the second electrode substrate and the transparent electrode or between the transparent electrode and the liquid crystal layer and having a reflection preventing function.

21. A display device which comprises:

a display panel including a first electrode substrate formed with at least one first electrode thereon, a second electrode substrate formed with at least one second electrode thereon, a light modulating layer sandwiched between the first and second substrates, and a multi-layered dielectric film formed in a predetermined pattern on at least one of the first and second electrode substrates and operable to transmit therethrough light of a particular wavelength region and reflect light of a wavelength region other than the particular wavelength region;

a switching means;

a signal generating means connected with at least one of the first and second electrodes of the display panel through the switching means; and

a detecting means for providing a signal in response to which said switching means operates to switch over between an applied state, in which a signal from said signal generating means is applied to said electrodes, and a non-applied state in which said signal from said signal generating means is not applied to said electrodes.

22. The display device as claimed in claim 21, wherein said switching means is operable in response to the signal from the detecting means to alternately switch over between the applied and non-applied states.

23. The display device as claimed in claim 21, wherein said light modulating layer is a layer of polymer dispersed liquid crystal material containing a light-curable resin component and a nematic liquid crystal component and wherein the average particle size of liquid crystal droplets of the polymer dispersed liquid crystal material or the average pore size of a polymer network thereof is within the range of 0.5 to 3 μ

m, and wherein said multi-layered dielectric film is a laminated structure of at least one low refractive dielectric thin-film, having an index of refraction not greater than 1.7, and a high refractive dielectric thin-film having an index of refraction not smaller than 1.8, and wherein said low refractive dielectric thin-film is made of one selected from the group consisting of SiO₂ and MgF₂, said high refractive dielectric thin-film is made of one selected from the group consisting of HfO₂ and ZrO₂.

24. A display device which comprises:

a display panel including a first electrode substrate formed with at least one first electrode thereon, a second electrode substrate formed with at least one second electrode thereon, a light modulating layer sandwiched between the first and second substrates and containing a light-curable resin component, and a multi-layered dielectric film formed on at least one of the first and second electrode substrates at locations corresponding to the electrodes, said multi-layered dielectric film being a laminated structure in which low refractive dielectric thin-films each having an index of refraction not greater than 1.7, and high refractive dielectric thin-films each having an index of refraction not smaller than 1.8 are alternately disposed one above the other;

a light generating means;

a condensing means for converting light emitted from the light generating means into substantially parallel light; and

an image enlarging means for enlarging an optical image on the liquid crystal panel to facilitate viewers to look at easily, said display panel being operable to form an optical image by converting rays of light emerging from the condensing means.

25. A display device which comprises:

a light generating means for generating visible rays of light by causing ultraviolet rays to act on a fluorescent element;

a condensing means for converting light emitted from the light generating means into substantially parallel light;

a liquid crystal panel for forming an optical image by converting rays of light emerging from the condensing means; and

an image enlarging means for enlarging an optical image on the liquid crystal panel to facilitate viewers looking at the image easily;

wherein said light generating means is arranged on a first member, said condensing means is arranged on a second member, and one of said first and second members is movable with respect to the other of said first and second members, whereby the distance between said light generating means and said condensing means is adjustable by movement of the one of said first and second members relative to the other of said first and second members.

26. The display device as claimed in claim 25, wherein said liquid crystal panel is a display panel operable to modulate the light as a function of light scattering condition.

27. A projection-type display device which comprises:

a display panel including a first substrate formed with at least one first electrode thereon, a second substrate formed with at least one second electrode thereon, a light modulating layer sandwiched between the first and second substrates, and a multi-layered dielectric film formed in a predetermined pattern on at least one of the first and second substrates and operable to transmit therethrough light of a particular wavelength region and reflect light of a wavelength region other than the particular wavelength region;

a light generating means; and

a projecting means for projecting light which has been modulated by the display panel.

28. The display device as claimed in claim 27, wherein said light modulating layer is a layer of polymer dispersed liquid crystal material containing a light-curable resin component and a nematic liquid crystal component, the average particle size of liquid crystal droplets of the polymer dispersed liquid crystal material or the average pore size of a polymer network thereof being within the range of 0.5 to 3 μ

m, and wherein said multi-layered dielectric film is a laminated structure including a low refractive dielectric thin-film, made of one selected from the group consisting of SiO₂ and MgF₂ and having a refractive index not greater than 1.7, and a high refractive dielectric thin-film made of one selected from the group consisting of HfO₂ and ZrO₂ and having a refractive index not smaller than 1.8.

29. A display panel which comprises:

a first substrate formed with pixel electrodes in a matrix pattern;

a second substrate formed with at least one counter electrode thereon;

a layer of polymer dispersed liquid crystal material sandwiched between the first and second substrates and containing a light-curable resin component and a nematic liquid crystal component, said light curable resin being a light-curable acrylic resin having a fluorine group and said liquid crystal component being a nematic liquid crystal of a chloric system;

a light generating means; and

a projecting means for projecting light which has been modulated by the display panel.

30. A display device which comprises:

a display panel including a first substrate formed with pixel electrodes in a matrix pattern, a second substrate formed with counter electrodes, a layer of polymer dispersed liquid crystal material sandwiched between the first and second substrates and containing a light-curable resin component, which is a light-curable acrylic resin having a fluorine group, and a nematic liquid crystal component, and an insulating film formed on at least one of the counter electrodes and the pixel electrodes and adjacent the layer of the polymer dispersed liquid crystal material and made of material having a specific resistance higher than that of the polymer dispersed liquid crystal material;

a light generating means; and

a projecting means for projecting light modulated by the display panel.

31. The display device as claimed in claim 30, wherein said light-curable acrylic resin component has a fluorine group and wherein said nematic liquid crystal component is a chloric nematic liquid crystal material.

32. The display device as claimed in claim 30, wherein said insulating layer is made of a material selected from the group consisting of polyamide and polyvinyl alcohol and has a film thickness within the range of 0.02 to 0.1 μ

m.

33. A projection-type display device which comprises:

a display panel including a first substrate formed with pixel electrodes in a matrix pattern, a second substrate formed with counter electrodes, a layer of polymer dispersed liquid crystal material sandwiched between the first and second substrates, and a dielectric film or column located on at least either between the neighboring pixel electrodes or on one of the counter electrodes facing the neighboring pixel electrodes and made of material having a relative dielectric constant not greater than that of the polymer dispersed liquid crystal material, said dielectric film or column containing a substance capable of absorbing light scattered from the polymer dispersed liquid crystal layer;

a light generating means; and

a projecting means for projecting light modulated by the display panel.

34. The display device as claimed in claim 33, wherein said polymer dispersed liquid crystal material includes a light-curable acrylic resin component having a fluorine group and a nematic liquid crystal component of a chloric system.

35. A projection-type display device which comprises:

a display panel including a first substrate formed with pixel electrodes in a matrix pattern, a second substrate formed with counter electrodes, a layer of polymer dispersed liquid crystal material sandwiched between the first and second substrates and containing a light-curable acrylic resin component and a nematic liquid crystal component, and a color filter formed on at least one of the counter electrodes and a portion between each neighboring pixel electrodes, a color filter of at least two colors being laminated between each neighboring pixel electrodes;

a light generating means; and

a projecting means for projecting light modulated by the display panel.

36. The display device as claimed in claim 35, wherein said pixel electrodes are reflecting electrodes made of a metallic thin-film, and further comprising at least one layer of a dielectric thin-film formed at least either between the second substrate and the counter electrode or between the counter electrode and the layer of the polymer dispersed liquid crystal material and having a reflection prevention function.

37. The display device as claimed in claim 35, wherein said light-curable resin component is a light-acrylic component having a fluorine group and wherein said nematic liquid crystal component is a chloric nematic liquid crystal material.

38. A projection-type display device which comprises:

a light generating means;

a light separating means for separating light, emitted from the light generating means, into a plurality of optical paths of different wavelength regions or a light separating means for separating light, emitted from the light generating means, into a plurality of optical paths of different wavelength regions and a light combining means for combining said plurality of the optical paths into a single optical path;

a light modulating means for modulating light traveling along each of the optical paths divided by said light separating means;

an optical coupling layer optically coupling the light modulating means with at least one of the light separating means and the light combining means;

a light projecting means for projecting the light which has been modulated by the light modulating means; and

a light absorbing means formed or arranged in one of the light separating means and the light combining means which is coupled with the light modulating means and at an area where no light effective for an image display travel.

39. The display device as claimed in claim 38, wherein said light separating means or said light combining means is a prism having a light separating surface operable to separate into a P-polarized light path and an S-polarized light path.

40. The display device as claimed in claim 38, wherein said light modulating means is a display panel including a first electrode substrate having pixel electrodes formed thereon in a matrix pattern, a second electrode substrate having at least one transparent electrode formed thereon, and a layer of polymer dispersed liquid crystal material sandwiched between the first and second electrode substrates, and further comprising at least one layer of a dielectric thin-film formed at least either between the second electrode substrate and the transparent electrode or between the transparent electrode and the layer of the polymer dispersed liquid crystal material and having an anti-reflection function.

41. A projection-type display device which comprises:

a light modulating means for modulating light as a function of change in light modulating state;

a light generating means;

a light changing means for doing at least one of a) separating light, emitted from said light generating means, into a plurality of optical paths and b) combining the optical paths together into a single optical path, said light changing means having a light separating surface constituted by a laminated structure in which low refractive dielectric thin-films and high refractive dielectric thin-films are alternately disposed one above the other;

a housing means for accommodating both of said light modulating means and said light changing means;

a quantity of liquid or gel filled in a space defined in said housing means and also in a space between said light modulating means and said light changing means; and

a projecting means for projecting the light modulated by said light modulating means.

42. The display device as claimed in claim 41, wherein said light modulating means is a display panel having a layer of polymer dispersed liquid crystal material containing a light-curable acrylic resin component and a nematic liquid crystal component, said light-curable acrylic resin component having a fluorine group and said nematic liquid crystal component being a chloric nematic liquid crystal material.

43. The display device as claimed in claim 41, wherein said light modulating means is a display panel including a first electrode substrate having pixel electrodes formed thereon in a matrix pattern, a second electrode pattern having at least one transparent electrode formed thereon, a layer of polymer dispersed liquid crystal material sandwiched between the first and second electrode substrates, and further comprising a light absorbing means located within said housing means at an area where no light is effective for image display travel, said light absorbing means being operable to absorb light which has been scattered by the display panel.

44. A projection-type display device which comprises:

a light generating means;

a light separating means for separating light, emitted from the light generating means, into first and second optical paths;

a first modulating means for modulating light disposed on the first optical path;

a second modulating means for modulating light disposed on the second optical path; and

a light combining means for combining light on the first optical path and light on the second optical path together;

a light coupling layer optically coupling said light combining means with said first modulating means and also with said second modulating means;

a projecting means for projecting the optical image formed in said first and second modulating means; and

a light absorbing means located at a region of said light combining means where light which does not participate in the display of the image passes.

45. The display device as claimed in claim 44, wherein said light separating means has an area where no light effective for display travel, and further comprising a light absorbing means for absorbing light located on said area of said light separating means.

46. A projection-type display device which comprises;

a light generating means;

a polarized light separating means for separating light emitted by the light generating means into a P-polarized light path and an S-polarized light path;

a polarized light combining means for combining the P-polarized and S-polarized light paths, separated by the polarized light separating means, into a single optical path;

a first light modulating means disposed on the P-polarized light path and optically coupled with the polarized light separating means or the polarized light combining means through a light coupling layer;

a second light modulating means disposed on the S-polarized light path and optically coupled with the polarized light separating means or the polarized light combining means through a light coupling layer;

a projection means for projecting optical image formed by the first and second modulating means;

said modulating means being operable to form an optical image as a function in light scattering state; and

a light absorbing means formed or disposed within the polarized light separating means or the polarized light combining means, which is optically coupled with the light modulating means, at an area where no light is effective for image display travel.

47. A projection-type display device which comprises:

a light generating means;

a light separating means for separating light, emitted from the light generating means, into first and second optical paths;

first and second light modulating means disposed on the first and second optical paths, respectively, said light modulating means being a liquid crystal display panel operable to form the optical image as a function of change in light scattering state; and

a projecting means for projecting first and second optical images, formed by the respective first and second modulating means, onto the same position, wherein a video signal to be written in an arbitrarily chosen first pixel of the first optical image projected by said projecting means has a phase opposite to a video signal to be written in an arbitrarily chosen second pixel of the second optical image projected by said projecting means.

48. The display device as claimed in claim 47, wherein said light modulating means includes red, green and blue mosaic color filters of three primary colors and is operable to form the optical image as a function of change in light scattering state and wherein said arbitrary chosen first pixel of the first optical image projected by the projecting means has a color different from that of the arbitrarily chosen second pixel of the second optical image projected by said projecting means.

49. The display device as claimed in claim 47, wherein said first and second optical images are projected onto respective positions displaced a distance corresponding to one pixel or half the pixel.

50. The display device as claimed in claim 47, wherein said light separating means is a prism and further comprising a light absorbing means formed or disposed in an area of the prism where no light effective for an image display travel.

51. The display device as claimed in claim 47, wherein the color filters of the first light modulating means have an color arrangement different from that of the color filters of the second light modulating means.

52. A projection display device which comprises:

a light generating means;

a light separating means for separating light, emitted from said light generating means, into a plurality of light components of different wavelengths;

a light modulating means for modulating light and including pixel electrodes, arranged in a matrix pattern, for forming an optical image as a function of change in light scattering state;

a microlens array including a plurality of micro-lenses arranged in a matrix pattern, and disposed on an incident side of the light modulating means; and

a projecting means for projecting the light modulated by the light modulating means, wherein the light on said optical paths enter the light modulating means after having been refracted by the micro-lenses and wherein each one of said micro-lenses correspond to the plural pixel electrodes.

53. The display device as claimed in claim 52, wherein said light modulating means is a display panel having a layer of polymer dispersed liquid crystal material containing a light-curable resin component and a nematic liquid crystal component, said light-curable resin component being a light-curable acrylic resin component having a fluorine group and said nematic liquid crystal component being a chloric nematic liquid crystal material.

54. The display device as claimed in claim 53, wherein said light modulating means is a display panel containing a polymer dispersed liquid crystal material, said display panel comprising a first substrate including switching elements for applying a signal to the pixel electrodes arranged in the matrix pattern and said pixel electrodes, and, a second substrate formed with counter electrodes, and a light shielding film made of resin and formed over said switching elements.

55. The display device as claimed in claim 52, wherein said light modulating means is formed with a multi-layered dielectric film, said multi-layered dielectric film being a laminated structure in which low refractive dielectric thin-films each having an index of refraction not greater than 1.7, and high refractive dielectric thin-films each having an index of refraction not smaller than 1.8 are alternately disposed one above the other, each of said low refractive dielectric thin-film being made of one selected from the group consisting of SiO₂ and MgF₂, each of said high refractive dielectric thin-films being made of one selected from the group consisting of HfO₂ and ZrO₂, and said multi-layered dielectric film being operable to transmit at least light of a particular wavelength within an ultraviolet region of light and reflect light of a particular wavelength within a visible region of light.

56. The display device as claimed in claim 52, and further comprising one of a transparent member and a lens optically coupled to an exit side of said light modulating means through an optical coupling layer.

57. The display device as claimed in claim 52, wherein said light modulating means comprises a first substrate having said pixel electrodes formed thereon in a matrix pattern, a second substrate having at least one counter electrode formed thereon, a layer of polymer dispersed liquid crystal material sandwiched between said first and second substrates, and an insulating film made of a material having a specific resistance higher than that of the layer of the polymer dispersed liquid crystal material and disposed on at least one of the counter electrode and the pixel electrodes and on one side adjacent the layer of the polymer dispersed liquid crystal material.

58. A projection-type liquid crystal display device which comprises:

a light generating means;

a light modulating means for modulating light emitted from the light generating means;

a projecting means for projecting light modulated by the light modulating means;

said light modulating means being a display panel containing polymer dispersed liquid crystal material and comprising a first substrate including pixel electrodes arranged in a matrix pattern and switching elements for applying a signal to the pixel electrodes, and a second substrate formed with a counter electrode; and

a light shielding film made of resin and overlaying the switching elements.

59. The display device as claimed in claim 58, wherein said light modulating means has a light modulating layer including a light-curable resin component and a liquid crystal component, said light-curable resin component containing a light-curable acrylic resin having a fluorine group, said liquid crystal component being a chloric nematic liquid crystal material.

60. The display device as claimed in claim 58, further comprising an insulating film made of material having a specific resistance higher than that of the layer of the polymer dispersed liquid crystal material and formed on at least one of the counter electrode and the pixel electrodes.

61. The display device as claimed in claim 58, further comprising an insulating film made of material having a specific resistance higher than that of the layer of the polymer dispersed liquid crystal material and formed on at least one of the counter electrode and the pixel electrodes, said insulating film being made of one of polyamide and polyvinyl alcohol, said insulating film having a film thickness within the range of 0.02 to 0.1 μ

m.

62. The display device as claimed in claim 58, further comprising a transparent member or a concave lens optically coupled through a light coupling layer with a light exit side of the light modulating means.