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US 8,284,372 B2Granted
Liquid crystal display panel and method for manufacturing same, and liquid crystal display device
AssigneeKabushiki Kaisha Toshiba
InventorsMasashi Aizawa, Atsuo Inoue, Yasutada Nakagawa
Life of this patent
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Abstract
A liquid crystal display panel includes: a pair of substrates; a cylindrical spacer configured to hold a gap between the pair of substrates, and a liquid crystal which fills the gap. The cylindrical spacer includes a first support portion having a first support surface and a second support portion having a second support surface. The first support portion is provided inside the second support surface so that the first support surface is projected from the second support surface. The second support portion is provided on a major surface of one of the substrates the second support surface from the major surface.
Claims11
A liquid crystal display panel comprising:
- a pair of substrates;
- a cylindrical spacer configured to hold a gap between the pair of substrates, and
- a liquid crystal which fills the gap;
- the cylindrical spacer including a first support portion having a first support surface and a second support portion having a second support surface,
- the first support portion being provided inside the second support surface so that the first support surface is projected from the second support surface,
- the second support portion being provided on a major surface of one of the substrates,
- an area density ρ1 of the first support surface satisfies relation (15):
- ρ
- 1
- <
- KP
- C
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
- E
-
- [
- K
-
- (
- 3
-
-
- f
- 2
-
- α
- LC
- -
- f
- 1
-
- α
- SS
- )
-
- Δ
-
-
- T
- -
- P
- C
-
- (
- 1
- +
- 3
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- ]
- (
- 15
- )
- where αLC is linear expansion coefficient of the liquid crystal, αSS is linear expansion coefficient of the spacer, f1 is a factor for correcting the linear expansion coefficient αSS of the spacer, f2 is a factor for correcting the linear expansion coefficient αLC of the liquid crystal, K is bulk modulus of the liquid crystal, E is Young's modulus of the spacer, ΔT is a temperature variation, and PC is a threshold of pressure at which bubbles are generated;
- an axial length g1 of the first support portion satisfies relation (16):
- g
- 1
- >
- g
- 0
-
- [
- 1
- -
- (
- K
- +
- ρ
- 1
-
- E
- )
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
-
- (
- 1
- +
- 3
-
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- K
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
- +
- ρ
- 1
-
- E
-
- (
- 1
- +
- 3
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- ]
- (
- 16
- )
- where g0 is an initial value of the gap, ρ1 is the area density of the first support surface, αLC is linear expansion coefficient of the liquid crystal, αSS is linear expansion coefficient of the spacer, f1 is a factor for correcting the linear expansion coefficient αSS of the spacer, f2, is a factor for correcting the linear expansion coefficient ΔLC of the liquid crystal, K is bulk modulus of the liquid crystal, E is Young's modulus of the spacer, and ΔT is a temperature variation;
- an area density ρ2 of the second support surface satisfies relation (17):
- ρ
- 2
- >
- g
- 0
- ·
- ɛ
- P
-
- (
- σ
- )
- ·
- σ
- g
- C
- (
- 17
- )
- where g0 is an initial value of the gap, gC is an allowable variation, εP(σ) is plastic strain of the spacer, and σ is a stress externally applied to the substrate;
- the substrates being supported by the first support portion according to a decrease in temperature, and
- the substrates being supported by the first support portion and the second support portion upon application of external stress.
192 more elements
A method for manufacturing a liquid crystal display panel, comprising:
- forming a film of a photocurable resin on one major surface of a substrate;
- and
- irradiating the film with ultraviolet radiation through a photomask to cure the photocurable resin,
- the photomask having a plurality of transmitting portions having different transmittances for the ultraviolet radiation,
- the photomask including a transmitting portion having continuously varying transmittance for the ultraviolet radiation,
- the photomask being used to form a plurality of second support portions on the major surface so that a second support surface is projected from the major surface, and to form a first support portion inside the second support surface so that a first support surface is projected from the second support surface of each of the plurality of second support portions;
- and
- an area density ρ1 of the first support surface satisfies relation (15):
- ρ
- 1
- <
- KP
- C
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
- E
-
- [
- K
-
- (
- 3
-
-
- f
- 2
-
- α
- LC
- -
- f
- 1
-
- α
- SS
- )
-
- Δ
-
-
- T
- -
- P
- C
-
- (
- 1
- +
- 3
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- ]
- (
- 15
- )
- where αLC is linear expansion coefficient of the liquid crystal, αSS is linear expansion coefficient of the spacer, f1 is a factor for correcting the linear expansion coefficient αSS of the spacer, f2 is a factor for correcting the linear expansion coefficient αLC of the liquid crystal, K is bulk modulus of the liquid crystal, E is Young's modulus of the spacer, ΔT is a temperature variation, and PC is a threshold of pressure at which bubbles are generated;
- an axial length g1 of the first support portion satisfies relation (16):
- g
- 1
- >
- g
- 0
-
- [
- 1
- -
- (
- K
- +
- ρ
- 1
-
- E
- )
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
-
- (
- 1
- +
- 3
-
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- K
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
- +
- ρ
- 1
-
- E
-
- (
- 1
- +
- 3
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- ]
- (
- 16
- )
- where g0 is an initial value of the gap, ρ1 is the area density of the first support surface, αLC is linear expansion coefficient of the liquid crystal, αSS is linear expansion coefficient of the spacer, f1 is a factor for correcting the linear expansion coefficient αSS of the spacer, f2 is a factor for correcting the linear expansion coefficient αLC of the liquid crystal, K is bulk modulus of the liquid crystal, E is Young's modulus of the spacer, and ΔT is a temperature variation;
- an area density ρ2 of the second support surface satisfies relation (17):
- ρ
- 2
- >
- g
- 0
- ·
- ɛ
- P
-
- (
- σ
- )
- ·
- σ
- gc
- (
- 17
- )
- where g0 is an initial value of the gap, gC is an allowable variation, εP(σ) is plastic strain of the spacer, and σ is a stress externally applied to the substrate.
190 more elements
A liquid crystal display device comprising:
- a liquid crystal display panel;
- and
- a mechanism member including a driving circuit,
- the liquid crystal display panel including:
- a pair of substrates;
- a cylindrical spacer configured to hold a gap between the pair of substrates, and
- a liquid crystal which fills the gap;
- the cylindrical spacer including a first support portion having a first support surface and a second support portion having a second support surface,
- the first support portion being provided inside the second support surface so that the first support surface is projected from the second support surface,
- the second support portion being provided on a major surface of one of the substrates,
- an area density ρ1 of the first support surface satisfies relation (15):
- ρ
- 1
- <
- KP
- C
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
- E
-
- [
- K
-
- (
- 3
-
- f
- 2
-
- α
- LC
- -
- f
- 1
-
- α
- SS
- )
-
- Δ
-
-
- T
- -
- P
- C
-
- (
- 1
- +
- 3
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- ]
- (
- 15
- )
- where αLC is linear expansion coefficient of the liquid crystal, αSS is linear expansion coefficient of the spacer, f1 is a factor for correcting the linear expansion coefficient αSS of the spacer, f2 is a factor for correcting the linear expansion coefficient αLC of the liquid crystal, K is bulk modulus of the liquid crystal, E is Young's modulus of the spacer, ΔT is a temperature variation, and PC is a threshold of pressure at which bubbles are generated;
- an axial length g1 of the first support portion satisfies relation (16):
- g
- 1
- >
- g
- 0
-
- [
- 1
- -
- K
- +
- ρ
- 1
-
- E
- )
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
-
- (
- 1
- +
- 3
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- K
-
- (
- 1
- +
- f
- 1
-
- α
- SS
-
- Δ
-
-
- T
- )
- +
- ρ
- 1
-
- E
-
- (
- 1
- +
- 3
-
- f
- 2
-
- α
- LC
-
- Δ
-
-
- T
- )
- ]
- (
- 16
- )
- where g0 is an initial value of the gap, ρ1 is the area density of the first support surface, αLC is linear expansion coefficient of the liquid crystal, αSS is linear expansion coefficient of the spacer, f1 is a factor for correcting the linear expansion coefficient αSS of the spacer, f2 is a factor for correcting the linear expansion coefficient αLC of the liquid crystal, K is bulk modulus of the liquid crystal, E is Young's modulus of the spacer, and ΔT is a temperature variation;
- an area density ρ2 of the second support surface satisfies relation (17):
- ρ
- 2
- >
- g
- 0
- ·
- ɛ
- P
-
- (
- σ
- )
- ·
- σ
- gc
- (
- 17
- )
- where g0 is an initial value of the gap, gC is an allowable variation, εP(σ) is plastic strain of the spacer, and σ is a stress externally applied to the substrate;
- the substrates being supported by the first support portion according to a decrease in temperature, and
- the substrates being supported by the first support portion and the second support portion upon application of external stress.
192 more elements
Dependencies are inferred from the claim text.