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Class Information
Number: 349
Name: Liquid crystal cells, elements and systems >
Description: This is the generic class for cells, elements, and systems which include molecules of a material having both liquid and crystalline properties. Elements or systems included in this class are those which have a significant liquid crystal cell detail or liquid crystal response or properties, and in which the liquid crystal controls or changes the optical properties of electromagnetic radiation such as direction, phase, amplitude, frequency, or polarization state. This class also provides for nominal manufacturing methods for producing significant liquid crystal cell structure.










Class Number Class Name No. of Patents
349/182

Cell containing liquid crystal of specific composition

409
349/185

In cholesteric phase

168
349/186

In nematic phase

276
349/184

In smectic phase

266
349/183

Polymer liquid crystal

270
349/193

Liquid crystal optical element

179
349/195

Antidazzle mirror formed from liquid crystal cell

59
349/196

Beam dividing switch formed from liquid crystal cell

131
349/197

Including passive liquid crystal switch portion

36
349/201

Liquid crystal diffraction element

222
349/202

For beam steering

108
349/198

Liquid crystal etalon

47
349/200

Liquid crystal lenses other than for eyewear

178
349/199

Liquid crystal sensors (e.g., voltmeters, pressure sensors, temperature sensors)

156
349/194

Passive liquid crystal polarizer

139
349/1

Liquid crystal system

467
349/17

Computational system employing liquid crystal element (neural network, correlation device, optical computer)

92
349/11

Heads-up display

180
349/13

Liquid crystal eyewear (glasses, goggles, etc.)

161
349/14

For protection

102
349/2

Liquid crystal for recording or imaging on photosensitive medium

188
349/4

Exposure device for lithography

34
349/3

Printer or print bar

69
349/16

Liquid crystal window

124
349/12

Liquid crystal writing tablet

349
349/5

Projector including liquid crystal cell (s)

848
349/6

Overhead projector

79
349/8

Plural light path projectors

413
349/9

Having light separated into s and p polarization

528
349/10

Wherein liquid crystal cells include microencapsulated or polymer dispersed liquid crystal

75
349/7

Video/motion picture projector

177
349/15

Stereoscopic

496
349/18

Variable or rotatable retarder used with other retarders to produce filtering effects (solc, lyot, partial)

86
349/187

Nominal manufacturing methods or post manufacturing processing of liquid crystal cell

1535
349/191

Aligning liquid crystal with means other than alignment layer

188
349/188

Changing liquid crystal phase

81
349/192

Defect correction or compensation

416
349/189

Injecting liquid crystal

284
349/190

Sealing of liquid crystal

585
349/19

Particular excitation of liquid crystal

73
349/33

Electrical excitation of liquid crystal (i.e., particular voltage pulses, ac vs. dc, threshold voltages, etc.)

521
349/35

For driving grandjean to focal conic or dynamic scattering type liquid crystal

57
349/36

Including diverse driving frequencies

53
349/54

Matrix including additional element (s) which correct or compensate for electrical fault

520
349/55

Laser links

170
349/37

Polarity based driving

241
349/40

With antistatic elements

399
349/34

With application of holding or bias voltage (i.e., voltage which does not change the optical state of the liquid crystal)

148
349/41

With particular switching device

251
349/42

Transistor

1214
349/48

Plural nonredundant transistors per pixel

352
349/43

Structure of transistor

1846
349/45

Transferred transistor

74
349/44

With light block conductively connected to transistor

425
349/46

With particular gate electrode structure

407
349/47

With gate electrode between liquid crystal and semiconductor layer

226
349/49

Two terminal nonlinear switching device (e.g., n-i-n, s-i-s, ferroelectric, etc.)

123
349/50

Diode

127
349/51

Metal-insulator-metal (i.e., mim)

106
349/52

With particular insulating layer

82
349/53

Varistor

26
349/38

With supplemental capacitor

1073
349/39

In active matrix with separate dedicated capacitor line

861
349/31

Electron beam excitation

35
349/23

Magnetic or pressure excitation

63
349/24

Optical excitation

79
349/25

With photoconductive layer (e.g., spatial light modulator(slms))

230
349/26

Of an alloy of s, se, or te

24
349/30

With particular dielectric mirror for spatial light modulator (i.e., slm)

70
349/29

With particular light blocking layer for separating read and write lights

50
349/27

With silicon photoconductive layer

59
349/28

With silicon photodiode, n-i-n photoconductor structure, or p-i-p photoconductor structure

41
349/32

Plasma excitation

77
349/20

Thermal excitation

105
349/21

By heating electrode

74
349/22

By light beam heating (e.g., ir, laser, etc.)

86
349/56

Particular structure

496
349/72

Detector of liquid crystal temperature

167
349/84

Having significant detail of cell structure only

308
349/117

Compensator or retarder (i.e., not using liquid crystal cell)

1410
349/119

Multiple compensators

662
349/120

Including at least one with negative intrinsic birefringence

226
349/121

With particular non-zero angle between compensator optical axis and orientation direction

236
349/118

With refractive indices in the x, y, and z directions

524
349/112

Diffuser (on viewer side of liquid crystal)

431
349/162

Dual function layer or element

128
349/139

Electrode or bus detail (i.e., excluding supplemental capacitor and transistor electrodes)

1779
349/140

Formed of semiconductor material

143
349/149

Having connection detail to external circuit

1392
349/150

Featuring flexible circuit (i.e., tape automated bonding (tab), etc.)

692
349/152

With detail of terminals to external circuit

885
349/151

With driving circuit having input and output electrodes on liquid crystal substrate

663
349/141

Interdigited (comb-shaped) electrodes

1696
349/143

Matrix electrodes

1138
349/147

Multilayer electrodes

389
349/146

Nonrectangular (odd) shaped pixels

329
349/145

Nonrectilinear rows and columns

196
349/148

Resistance reducing electrodes

143
349/144

Split pixels

603
349/142

Segmented or fixed pattern

393
349/104

Filter

218
349/106

Color filter

2104
349/107

With different liquid crystal thickness for each color of filter

157
349/108

With plural colors for each display element (i.e., each pixel or segment)

259
349/109

With unequal areas for different colors or with fractional shift between one line of colors and the next

185
349/105

Interference filter

102
349/110

Opaque mask or black mask

1281
349/111

Conductive mask

449
349/161

Heating or cooling element other than for exciting

306
349/153

Liquid crystal seal

971
349/154

With particular injection port or injection plug

174
349/86

Microencapsulated or polymer dispersed liquid crystal

657
349/87

For variable polarizer

45
349/92

Formed by particular technique

154
349/94

Formed with particular alignment technique

73
349/93

Having uv polymerized element

146
349/88

Polymer network liquid crystal

207
349/89

With particular encapsulating medium

257
349/91

With nonpolymer encapsulating medium

26
349/90

With second material between liquid crystal and encapsulating medium

67
349/95

Microlenses

422
349/163

Nonchiral additive in the liquid crystal material

74
349/164

Fluorescent additive

32
349/166

Nonspacer particles significantly smaller than liquid crystal thickness (e.g., scattering centers, ferromagnetic particles, etc.)

53
349/165

Pleochroic dye

210
349/122

Particular nonoptical film or layer (e.g., adhesive layer, barrier layer)

855
349/123

Alignment layer

950
349/132

For parallel alignment

272
349/133

With chiral smectic liquid crystal (includes ferroelectric liquid crystal)

180
349/135

With particular polymer composition of the alignment layer (e.g., fluorine- containing aliphatic polyamide)

147
349/134

With particular pretilt angle from the alignment layer

139
349/136

With particular pretilt angle (i.e., with liquid crystal other than chiral smectic)

170
349/130

For perpendicular alignment

688
349/131

Silanes

53
349/124

Formed by particular technique (e.g., langmuir blodgett, stretching, etc.)

529
349/125

Having particular deposited structure (e.g., angled, plural layered) produced by vapor deposition

172
349/126

Having structure produced by rubbing under particular rubbing conditions (e.g., particular direction, rubbing force, by using named rubbing material or roller, etc.)

216
349/127

Formed of a liquid crystal material

121
349/128

With different alignments on opposite substrates

331
349/129

With plural alignments on the same substrate

1246
349/137

Antireflection layer

209
349/138

Insulating layer

993
349/116

Photoconductive element (i.e., not used for exciting)

238
349/96

Polarizer

1473
349/98

Circular

293
349/97

Color

191
349/103

With particular non-zero and non-90 angle between opposite polarization axes

71
349/102

With particular non-zero angle between polarization axis and compensator optical axis

131
349/99

With particular non-zero angle between polarization axis and orientation direction

158
349/100

For ferroelectric liquid crystal

75
349/101

For supertwisted nematic liquid crystal

69
349/85

Producing a greyscale effect

104
349/113

Reflector

1515
349/115

Cholesteric reflector

319
349/114

Dielectric mirror (i.e., in devices excited other than by photoconductive layer) or transflector

1394
349/155

Spacer

954
349/156

Formed as walls (e.g., between pixels) or integral with substrate

692
349/157

Plural types in single liquid crystal cell

207
349/158

Substrate

765
349/159

Fiberoptic faceplate

75
349/160

With particular topology (i.e., other than for diffraction and spacers)

133
349/58

Holder, support, frame, or housing

2256
349/59

Including electromagnetic shielding

208
349/60

Including resilient support member

444
349/73

Interconnection of plural cells in parallel (e.g., edge to edge)

232
349/74

Interconnection of plural cells in series

410
349/75

For compensation of birefringence effects

133
349/76

Of twisted (or chiral) nematic or supertwisted nematic liquid crystal

113
349/77

With particular cooperation between cells (e.g., alternating selection or simultaneous selection of cells)

129
349/78

Cell cooperation providing multicolor display

98
349/80

With color formed by different color polarizer or color filter associated with each cell

81
349/79

With color formed by different dye in each cell

56
349/81

With cells being substantially identical and driven simultaneously, providing improved contrast

39
349/83

With each cell displaying a different pattern

52
349/82

With projection of electrodes in one cell substantially nonoverlapping that of another cell (i.e., for improving resolution)

36
349/57

Lens or prism separate from projection system (i.e., it is not integral part of illumination system)

274
349/61

Particular illumination

1067
349/69

Electroluminescent light source

411
349/70

Fluorescent light source

377
349/71

Formed of planar phosphor or fluorescent layer separate from illumination source

169
349/62

With integral optical element for guiding or distributing light from the light source

1125
349/64

Diffuser between light source and liquid crystal

865
349/65

Edge lit type light guide behind liquid crystal

1375
349/66

Louvres

118
349/67

Reflector having particular shape behind light source

359
349/63

Specifically for guiding light in a front-lit device

322
349/68

With plural diverse light sources (e.g., for day and night)

250
 

Utilizing a liquid crystal material (359/36)

 
349/167

With specified nonchemical characteristic of liquid crystal material

103
349/168

Utilizing change between diverse phases (e.g., cholesteric to nematic)

120
349/169

Utilizing change within liquid crystal phase (e.g., grandjean to focal conic, etc.)

85
349/170

Utilizing reversal in sign of dielectric anisotropy

50
349/175

Within cholesteric phase

151
349/176

Using reflection characteristic

192
349/177

Within nematic phase

171
349/178

Negative dielectric anisotropy only

128
349/179

Twisted (or chiral) nematic or supertwisted nematic

178
349/181

Having particular birefringence or retardation

219
349/180

Having particular parameter of twist

189
349/171

Within smectic phase

115
349/172

Within chiral smectic phase (includes ferroelectric)

372
349/174

Antiferroelectric

73
349/173

Greyscale resulting from liquid crystal property other than solely smectic a

46
 
 
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