EP0362776A2
Expired / Lapsed
EP
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Projection type active matrix liquid crystal display device
Assignee: AGC Inc
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Filing: 1989-10-02
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Granted: —
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Expires: 2009-10-02
Abstract
Abstract An active matrix liquid crystal display element and a projection type active matrix liquid crystal display device by which a display can be obtained which is good in color balance and high in brightness and also in contrast ratio. The display element includes a liquid crystal material held between an active matrix substrate and a counter electrode substrate. The liquid crystal material is formed from a liquid crystal polymer composite wherein nematic liquid crystal is contained dispersively in a polymer matrix having a refractive index which coincides with the ordinary refractive index of the liquid crystal used, and a silicon thin film transistor is used as an active element on the active matrix substrate. The display device includes such an active matrix liquid crystal display element, a light source for projection light, and an optical system of projection.
Inventors
- 👤 Tomoki Gunjima
- 👤 Masanori Yuki
- 👤 Masaya Kunigita
- 👤 Yoshinori Hirai
- 👤 Yukio Yoshikawa
- 👤 Eiji Shidoji
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 03:13
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334; G09; G09F; G09F19/00; G09F19/12; G09F19/18; G02F2202/00; G02F2202/40
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
102 words
An active matrix liquid crystal display element of the type wherein a liquid crystal material is held between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, characterized in that said liquid crystal material is formed from a liquid crystal polymer composite wherein nematic liquid crystal is contained dispersively in a polymer matrix having a refractive index which coincides with the ordinary refractive index (n o ) of the liquid crystal used, and a polysilicon thin film transistor is used as the active element.
Claim 2
Dependent Claim
102 words
An active matrix liquid crystal display element of the type wherein a liquid crystal material is held between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, characterized in that said liquid crystal material is formed from a liquid crystal polymer composite wherein nematic liquid crystal is contained dispersively in a polymer matrix having a refractive index which coincides with the ordinary refractive index (n o ) of the liquid crystal used, and a polysilicon thin film transistor is used as the active element.
Claim 3
Dependent Claim
121 words
A projection type active matrix liquid crystal display device of the type which includes an active matrix liquid crystal display element wherein a liquid crystal material held between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, a light source for projection light, and an optical system of projection, characterized in that said liquid crystal material is formed from a liquid crystal polymer composite wherein nematic liquid crystal is contained dispersively in a polymer matrix having a refractive index which coincides with the ordinary refractive index of the liquid crystal used, and a polysilicon thin film transistor is used as the active element.
Claim 4
Dependent Claim
121 words
A projection type active matrix liquid crystal display device of the type which includes an active matrix liquid crystal display element wherein a liquid crystal material held between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, a light source for projection light, and an optical system of projection, characterized in that said liquid crystal material is formed from a liquid crystal polymer composite wherein nematic liquid crystal is contained dispersively in a polymer matrix having a refractive index which coincides with the ordinary refractive index of the liquid crystal used, and a polysilicon thin film transistor is used as the active element.
Claim 5
Dependent Claim
171 words
A projection type active matrix liquid crystal display device of the type which includes an active matrix liquid crystal display element wherein a liquid crystal polymer composite composed of positive nematic liquid crystal dispersively contained in a polymer matrix having a refractive index which is substantially equal to the ordinary refractive index (n o ) of the liquid crystal used is held between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, a light source for projection light, and an optical system of projection, characterized in that the anisotropy of refractive index Δn of the nematic liquid crystal used is greater than 0.18, and the average particle diameter R(µm) of the liquid crystal dispersively contained in the polymer matrix and the distance d(µm) between the active matrix substrate and the counter electrode substrate satisfy the relationships of 0.3 < R · Δn < 0.7 (1) 4 R < d < 8 R (2)
Claim 6
Dependent Claim
171 words
A projection type active matrix liquid crystal display device of the type which includes an active matrix liquid crystal display element wherein a liquid crystal polymer composite composed of positive nematic liquid crystal dispersively contained in a polymer matrix having a refractive index which is substantially equal to the ordinary refractive index (n o ) of the liquid crystal used is held between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, a light source for projection light, and an optical system of projection, characterized in that the anisotropy of refractive index Δn of the nematic liquid crystal used is greater than 0.18, and the average particle diameter R(µm) of the liquid crystal dispersively contained in the polymer matrix and the distance d(µm) between the active matrix substrate and the counter electrode substrate satisfy the relationships of 0.3 < R · Δn < 0.7 (1) 4 R < d < 8 R (2)
Claim 7
Dependent Claim
49 words
A projection type active matrix liquid crystal display device as set forth in Claim 3, characterized in that the maximum root mean square of applied voltage V(V) applied to the liquid crystal polymer composite satisfies the relationship of 0.5 R · V < d < R · V (3)
Claim 8
Dependent Claim
176 words
A projection type active matrix liquid crystal display device which includes an active matrix liquid crystal display element wherein a liquid crystal material is held between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, a light source for projection light, and an optical system of projection, characterized in that the liquid crystal material used is a liquid crystal polymer composite wherein nematic liquid crystal is dispersively contained in a polymer matrix having a refractive index which coincides with the ordinary refractive index (n o ) of the liquid crystal used, and the anisotropy of refractive index Δn of the nematic liquid crystal used in greater than 0.18 while the average particle diameter R(µm) of the liquid crystal dispersively contained in the polymer matrix and the distance d(µm) between the active matrix substrate and the counter electrode substrate satisfy the relationships of 0.3 < R · Δn < 0.7 (1) 4 R < d < 8 R (2)
Claim 9
Dependent Claim
176 words
A projection type active matrix liquid crystal display device which includes an active matrix liquid crystal display element wherein a liquid crystal material is held between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, a light source for projection light, and an optical system of projection, characterized in that the liquid crystal material used is a liquid crystal polymer composite wherein nematic liquid crystal is dispersively contained in a polymer matrix having a refractive index which coincides with the ordinary refractive index (n o ) of the liquid crystal used, and the anisotropy of refractive index Δn of the nematic liquid crystal used in greater than 0.18 while the average particle diameter R(µm) of the liquid crystal dispersively contained in the polymer matrix and the distance d(µm) between the active matrix substrate and the counter electrode substrate satisfy the relationships of 0.3 < R · Δn < 0.7 (1) 4 R < d < 8 R (2)
Claim 10
Dependent Claim
262 words
A projection type active matrix liquid crystal display device of the type which includes a plurality of colored light sources, a plurality of active matrix liquid crystal display elements for individually receiving light from said colored light sources, and an optical system of projection for combining light emerging from said active matrix liquid crystal display elements and projecting the thus combined light, characterized in that each of said active matrix liquid crystal display elements is constituted such that nematic liquid cryatl is dispersively contained in a polymer matrix between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, and the refractive indices of the polymer matrices substantially coincide with the ordinary refractive indices (n o ) of the liquid crystal used and the anisotropies of refractive index Δn of the liquid crystal used are greater than 0.18 while the average particle diameters R x (µm) of the liquid crystal of the individual colors dispersively contained in the polymer matrices, the distances d x (µm) between the active matrix substrates and the counter electrodes and the dominant wavelengths λ x of the colors of the individual light sources have the following relationship to the average particle diameter R G (µm) and the electrode distance d G (µm) where the dominant wavelength λ G of the light source of green is λ G = 540 nm 0.3 < R G · Δn < 0.7 (1A) 4 R G < d G < 8 R G (2A)
Claim 11
Dependent Claim
262 words
A projection type active matrix liquid crystal display device of the type which includes a plurality of colored light sources, a plurality of active matrix liquid crystal display elements for individually receiving light from said colored light sources, and an optical system of projection for combining light emerging from said active matrix liquid crystal display elements and projecting the thus combined light, characterized in that each of said active matrix liquid crystal display elements is constituted such that nematic liquid cryatl is dispersively contained in a polymer matrix between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, and the refractive indices of the polymer matrices substantially coincide with the ordinary refractive indices (n o ) of the liquid crystal used and the anisotropies of refractive index Δn of the liquid crystal used are greater than 0.18 while the average particle diameters R x (µm) of the liquid crystal of the individual colors dispersively contained in the polymer matrices, the distances d x (µm) between the active matrix substrates and the counter electrodes and the dominant wavelengths λ x of the colors of the individual light sources have the following relationship to the average particle diameter R G (µm) and the electrode distance d G (µm) where the dominant wavelength λ G of the light source of green is λ G = 540 nm 0.3 < R G · Δn < 0.7 (1A) 4 R G < d G < 8 R G (2A)
Claim 12
Dependent Claim
102 words
A projection type active matrix liquid crystal display device as set forth in Claim 6, characterized in that said liquid crystal display device is composed of three colored light sources of red, green and blue and three active matrix liquid display elements, and the average particle diameters R R , R G and R B of the liquid crystal of the three colored liquid crystal display elements, the electrode distances d R , d G and d B and the dominant wavelengths λ R , λ G and λ B of the colors of the individual light sources satisfy the relationships of
Claim 13
Dependent Claim
250 words
A projection type active matrix liquid crystal display device of the type which includes a plurality of colored light sources, a plurality of active matrix liquid crystal display elements for individually receiving light from said colored light sources, and an optical system of projection for combining light emerging from said active matrix liquid crystal display elements and projecting the thus combined light, characterized in that each of said active matrix liquid crystal display elements is constituted such that nematic liquid crystal having a positive dielectric anisotropy is dispersively contained in a polymer matrix between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, and the refractive index of the polymer matrix substantially coincides with the ordinary refractive index (n o ) of the liquid crystal used and the anisotropy of refractive index Δn of the liquid crystal used is greater than 0.18 while the average particle diameters R(µm) of the liquid crystals of the individual colors dispersively contained in the polymer matrices, the electrode distances d x (µm) for the individual colors and the dominant wavelengths λ x of the colors of the individual light sources have the following relationship to the electrode distance d G (µm) where the dominant wavelength λ G of the light source of green is λ G = 540 nm 0.3 < R · Δn < 0.7 (1) 4 R < d G < 8 R (2)
Claim 14
Dependent Claim
250 words
A projection type active matrix liquid crystal display device of the type which includes a plurality of colored light sources, a plurality of active matrix liquid crystal display elements for individually receiving light from said colored light sources, and an optical system of projection for combining light emerging from said active matrix liquid crystal display elements and projecting the thus combined light, characterized in that each of said active matrix liquid crystal display elements is constituted such that nematic liquid crystal having a positive dielectric anisotropy is dispersively contained in a polymer matrix between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, and the refractive index of the polymer matrix substantially coincides with the ordinary refractive index (n o ) of the liquid crystal used and the anisotropy of refractive index Δn of the liquid crystal used is greater than 0.18 while the average particle diameters R(µm) of the liquid crystals of the individual colors dispersively contained in the polymer matrices, the electrode distances d x (µm) for the individual colors and the dominant wavelengths λ x of the colors of the individual light sources have the following relationship to the electrode distance d G (µm) where the dominant wavelength λ G of the light source of green is λ G = 540 nm 0.3 < R · Δn < 0.7 (1) 4 R < d G < 8 R (2)
Claim 15
Dependent Claim
88 words
A projection type active matrix liquid crystal display device as set forth in Claim 8, characterized in that said liquid crystal display device is composed of three colored light sources of red, green and blue and three active matrix liquid display elements, and the electrode distances d R , d G and d B of said liquid crystal display elements for the three colors and the dominant wavelengths λ R , λ G and λ B of the colors of the individual light sources satisfy the following relatioship
Claim 16
Dependent Claim
191 words
An active matrix liquid crystal display element of the type which includes a plurality of color filters disposed therein, characterized in that nematic liquid crystal having a positive dielectric anisotropy is dispersively contained in a polymer matrix between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, and the refractive index of the polymer matrix substantially coincides with the dominant refractive index (n o ) of the liquid crystal used and the anisotropy of refractive index Δn of the liquid crystal used is greater than 0.18 while the average particle diameter R(µm) and the electrode distances d x (µm) of the liquid crystal of the individual colors dispersively contained in the polymer matrix and the dominant wavelengths λ x of transmission light through the individual color filters have the following relationships to the electrode distance d G (µm) where the dominant wavelength λ G of the light source of green is λ G = 540 nm 0.3 < R · Δn < 0.7 (1) 4 R < d G < 8 R (2)
Claim 17
Dependent Claim
191 words
An active matrix liquid crystal display element of the type which includes a plurality of color filters disposed therein, characterized in that nematic liquid crystal having a positive dielectric anisotropy is dispersively contained in a polymer matrix between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, and the refractive index of the polymer matrix substantially coincides with the dominant refractive index (n o ) of the liquid crystal used and the anisotropy of refractive index Δn of the liquid crystal used is greater than 0.18 while the average particle diameter R(µm) and the electrode distances d x (µm) of the liquid crystal of the individual colors dispersively contained in the polymer matrix and the dominant wavelengths λ x of transmission light through the individual color filters have the following relationships to the electrode distance d G (µm) where the dominant wavelength λ G of the light source of green is λ G = 540 nm 0.3 < R · Δn < 0.7 (1) 4 R < d G < 8 R (2)
Claim 18
Dependent Claim
87 words
A projection type active matrix liquid crystal display device as set forth in Claim 10, characterized in that said liquid crystal display element is an active matrix liquid crystal display element having three color filters for red, green and blue, and the electrode distances d R , d G and d B of the liquid crystal display element corresponding to the three color filters and the dominant wavelengths λ R , λ G and λ B of transmission lights through the individual color-filters satisfy the following relationship
Claim 19
Dependent Claim
231 words
A projection type active matrix liquid crystal display device of the type which includes a projection light source, an active matrix liquid crystal display element having a plurality of color filters disposed thereon, and an optical system of projection for projecting light emerging from said active matrix liquid crystal display element, characterized in that said active matrix liquid crystal display element is composed of nematic liquid crystal having a positive dielectric anisotropy and dispersively contained in a polymer matrix between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, and the refractive index of the polymer matrix substantially coincides with the ordinary refractive index (n o ) of liquid crystal used and the anisotropy of refractive index Δn of the liquid crystal used is greater than 0.18 while the average particle diameter R(µm) and the electrode distances d x (µm) of the liquid crystals of the individual colors dispersively contained in the polymer matrix and the dominant wavelength λ x of transmission light through the individual color filters have the following relationship to the electrode distance d G where the dominant wavelength λ G of the light source of green is λ G = 540 nm 0.3 < R · Δn < 0.7 (1) 4 R < d G < 8 R (2)
Claim 20
Dependent Claim
231 words
A projection type active matrix liquid crystal display device of the type which includes a projection light source, an active matrix liquid crystal display element having a plurality of color filters disposed thereon, and an optical system of projection for projecting light emerging from said active matrix liquid crystal display element, characterized in that said active matrix liquid crystal display element is composed of nematic liquid crystal having a positive dielectric anisotropy and dispersively contained in a polymer matrix between an active matrix substrate on which an active element is provided for each pixel electrode and a counter electrode substrate on which a counter electrode is provided, and the refractive index of the polymer matrix substantially coincides with the ordinary refractive index (n o ) of liquid crystal used and the anisotropy of refractive index Δn of the liquid crystal used is greater than 0.18 while the average particle diameter R(µm) and the electrode distances d x (µm) of the liquid crystals of the individual colors dispersively contained in the polymer matrix and the dominant wavelength λ x of transmission light through the individual color filters have the following relationship to the electrode distance d G where the dominant wavelength λ G of the light source of green is λ G = 540 nm 0.3 < R · Δn < 0.7 (1) 4 R < d G < 8 R (2)
Claim 21
Dependent Claim
88 words
A projection type active matrix liquid crystal display device as set forth in Claim 12, characterized in that said liquid crystal display device is composed of three color filters of red, green and blue and three active matrix liquid crystal display elements, and the electrode distances d R , d G and d B of the liquid crystal display elements for the three colors and the dominant wavelengths λ R , λ G and λ B of transmission lights of the individual color filters satisfy the following relationship
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