LIQUID CRYSTAL DISPLAY HAVING WIDE VIEWING ANGLE

• US 20080007665A1
• Filed: 08/09/2007
• Published: 01/10/2008
• Est. Priority Date: 05/29/1997
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Kyeong Hyeon, CHEN, Jian-MIn, LYU, Jae-Jin, LEE, Hea-Ri
• Application Number:
  US11/836,506
• Publication Number:
  US 20080007665A1
• Time in Patent Office: Days
• US Class Current: 349/038
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/137 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
• CPC Class Codes: G02F 1/13712 the liquid crystal having negative dielectric anisotropy
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/128 field shaping

Abstract

Apertures are formed in the common electrode or in the pixel electrode of a liquid crystal display to form a fringe field. Storage capacitor electrodes are formed at the position corresponding to the apertures to prevent the light leakage due to the disclination caused by the fringe field. The apertures extend horizontally, vertically or obliquely. The apertures in adjacent pixel regions may have different directions to widen the viewing angle.

Claims

1-59. -59. (canceled)

60. A liquid crystal display comprising:

a first substrate comprising a common electrode;

a second substrate opposite the first substrate;

a pixel electrode formed on the second substrate; and

a storage capacitor electrode formed on the second substrate, overlapping the pixel electrode;

wherein at least one of the pixel electrode and the common electrode comprising a first linear domain divider and a second linear domain divider, and the first and the second linear domain divider are substantially arranged in a shape of chevron

wherein at least one of the first and the second linear domain dividers is arranged in a parallel direction with a extending direction of the storage capacitor electrode.

61. A liquid crystal display of claim 60, further comprising:

a data line extended in a first direction;

a gate line extended in a second direction perpendicular to the first direction;

wherein the storage capacitor electrode is extended in a direction different from the first direction and the second direction.

62. A liquid crystal display of claim 61, further comprising:

a branch formed on the second substrate, extended in the first direction and electrically connected to the storage capacitor electrode.

63. A liquid crystal display of claim 60, further comprising:

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and interposed between the first and the second substrates.

64. A liquid crystal display of claim 63, wherein the first linear domain divider is located at the upper area of the pixel electrode and the second linear domain divider is located at the lower area of the pixel electrode.

65. A liquid crystal display of claim 63, wherein the first and the second linear domain dividers have one width.

66. A liquid crystal display of claim 60, wherein the first and the second linear domain dividers meet each other at end portions of domain dividers.

94. A liquid crystal display of claim 60, wherein the domain dividers are apertures.

67. A liquid crystal display comprising:

a first substrate comprising a common electrode;

a second substrate opposite the first substrate;

a pixel electrode formed on the second substrate;

a branch formed on the second substrate, overlapping the pixel electrode and extending in a first direction;

a storage capacitor electrode formed on the second substrate, overlapping the pixel electrode, electrically connected to the branch and extended in a direction different from the first direction;

wherein one of the pixel electrode and the common electrode comprising a first linear domain divider and a second linear domain dividers, and the first and the second linear domain dividers are substantially arranged in a shape of chevron.

68. A liquid crystal display of claim 67, wherein at least one of the first linear domain divider and the second linear domain divider is arranged in a parallel direction with a extending direction of the storage capacitor.

69. a liquid crystal display of claim 68, further comprising:

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and interposed between the first and the second substrates.

70. A liquid crystal display of claim 69, wherein the first linear domain divider is located at the upper area of the pixel electrode and the second linear domain divider is located at the lower area of the pixel electrode.

71. A liquid crystal display of claim 69, wherein the first and the second linear domain dividers have one width.

72. A liquid crystal display of claim 67, wherein the first and the second linear domain dividers meet each other at end portions of domain dividers.

95. A liquid crystal display of claim 67, wherein the domain dividers are apertures.

73. A liquid crystal display comprising:

a first substrate comprising a common electrode;

a second substrate opposite the first substrate;

a data line extended in a first direction;

a gate line extended in a second direction perpendicular to the first direction;

a pixel electrode formed on the second substrate;

a storage capacitor electrode formed on the second substrate, overlapping the pixel electrode;

wherein one of the pixel electrode and the common electrode comprising a first linear domain divider and a second linear domain divider and the first and the second linear domain dividers are extended in directions different from the first and the second directions and are substantially arranged in a shape of chevron.

wherein at least one of the first and the second linear domain dividers is arranged in a parallel direction with a extending direction of the storage capacitor electrode.

74. A liquid crystal display of claim 73, further comprising:

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and interposed between the first and the second substrates.

75. A liquid crystal display of claim 74, wherein the first linear domain divider is located at the upper area of the pixel electrode and the second linear domain divider is located at the lower area of the pixel electrode.

76. A liquid crystal display of claim 75, wherein the first and the second linear domain dividers have one width.

77. A liquid crystal display of claim 73, wherein the first and the second linear domain divider meet each other at end portions of domain divider.

96. A liquid crystal display of claim 73, wherein the domain dividers are apertures.

78. A liquid crystal display comprising:

a first substrate comprising a common electrode;

a second substrate opposite the first substrate;

a pixel electrode formed on the second substrate; and

a storage capacitor electrode formed on the second substrate, overlapping the pixel electrode;

wherein one of the pixel electrode and the common electrode comprising a first linear domain divider and a second linear domain divider, and the first and the second linear domain dividers are substantially arranged in a shape of chevron,

wherein the first and the second linear domain dividers have one width,

wherein the first linear domain divider is located at the upper area of the pixel electrode and the second linear domain divider is located at the lower area of the pixel electrode.

79. A liquid crystal display of claim 78, further comprising:

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and interposed between the first and the second substrates.

80. A liquid crystal display of claim 78, wherein the first and the second linear domain divider meet each other at end portions of domain dividers.

97. A liquid crystal display of claim 78, wherein the domain dividers are apertures.

81. A liquid crystal display comprising:

a first substrate comprising a common electrode;

a second substrate opposite the first substrate;

a TFT formed on the second substrate;

a passivation layer formed on the TFT

a pixel electrode formed on the passivation layer and electrically connected to the TFT; and

a storage capacitor electrode formed on the second substrate and overlapping the pixel electrode;

wherein the pixel electrode comprising a first linear domain divider and a second linear domain divider, and the first and the second linear domain dividers are substantially arranged in a shape of chevron,

wherein the first linear domain divider is located at the upper area of the pixel electrode and the second linear domain divider is located at the lower area of the pixel electrode.

82. A liquid crystal display of claim 81, wherein the first and the second linear domain dividers have one width.

83. A liquid crystal display of claim 81, wherein the passivation layer has a thickness equal to or more than 3 μ

m.

84. A liquid crystal display of claim 83, wherein the passivation layer is made of organic material.

85. A liquid crystal display of claim 81, further comprising:

a spacer is interposed between the first and the second substrates and made of organic material.

86. A liquid crystal display of claim 81, wherein the first and the second linear domain dividers meet each other at end portions of domain dividers.

87. A liquid crystal display of claim 81, wherein at least one of the first and the second linear domain dividers is arranged in a parallel direction with a extending direction of the storage capacitor electrode.

88. A liquid crystal display of claim 87, further comprising:

a data line extending in a first direction;

a gate line extending in a second direction perpendicular to the first direction;

wherein the storage capacitor electrode is extended in a direction different from the first direction and the second direction.

89. A liquid crystal display of claim 88, further comprising a branch formed on the second substrate, overlapping the pixel electrode, connected to the storage capacitor electrode and extended in a first direction.

98. A liquid crystal display of claim 81, wherein the domain dividers are apertures.

90. A liquid crystal display comprising:

a first substrate comprising a common electrode;

a second substrate opposite the first substrate;

a pixel electrode formed on the second substrate; and

a storage capacitor electrode formed on the second substrate, overlapping the pixel electrode; and

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and interposed between the first and the second substrates,

wherein the liquid crystal layer is divided into a plurality of domain areas when electric field is applied to the liquid crystal layer and the storage capacitor electrode is arranged along at least one boundary between a plurality of domain areas.

91. A liquid crystal display comprising:

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and divided into a plurality of domain areas when electric field is applied to the liquid crystal layer;

a storage capacitor electrode arranged along at least one of boundaries between a plurality of domain areas;

wherein the boundaries between a plurality of domain areas are arranged in a shape of chevron.

92. A liquid crystal display comprising:

a first electrode;

a second electrode;

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and divided into a plurality of domain areas when electric field is applied to the liquid crystal layer by the first electrode and the second electrode;

a storage capacitor electrode arranged along at least one of boundaries between a plurality of domain areas;

a branch electrically connected to the storage capacitor and arranged in a parallel direction with one direction of edges of the first electrode.

93. A liquid crystal display comprising:

a first electrode;

a second electrode;

a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy and divided into a plurality of domain areas when electric field is applied to the liquid crystal layer by the first electrode and the second electrode;

a branch overlapping the first electrode and arranged in a parallel direction with one direction of edges of the first electrode,

wherein directions of the boundaries between a plurality of domain areas are not in a parallel or perpendicular with a extending direction of the branch and the branch is arranged in a parallel direction with one direction of edges of the first electrode.