30results about How to "Small driving voltage" patented technology

Such a liquid crystal compound is provided that has stability to heat, light and so forth, has a nematic phase in a wide temperature range, has a small viscosity, a suitable optical anisotropy, and suitable elastic constants K₃₃ and K₁₁ (K₃₃: bend elastic constant, K₁₁: splay elastic constant), and has suitable negative dielectric anisotropy and excellent compatibility with other liquid crystal compounds. A liquid crystal composition containing the liquid crystal compound, and a liquid crystal display device containing the liquid crystal composition are also provided.

The liquid crystal compound is represented by one of formulas (a) to (d), the liquid crystal composition contains the liquid crystal compound, and the liquid crystal display device contains the liquid crystal composition:

wherein Ra and Rb are independently linear alkyl or linear alkoxy, rings A¹, A², B and C are independently trans-1,4-cyclohexylene or 1,4-phenylene, Z¹¹, Z¹², Z² and Z³ are independently a single bond or alkylene, and one of X₁ and X₂ is fluorine, and the other thereof is chlorine.

The invention provides a liquid crystal compound which has stability to heat, light and so forth, shows liquid crystal phases in a wide temperature range, and has a small viscosity, an appropriate optical anisotropy, a large dielectric anisotropy, and an excellent compatibility with other liquid crystal compounds. The invention provides a liquid crystal composition which has an appropriate optical anisotropy, an appropriate dielectric anisotropy, a low threshold voltage, and a high maximum temperature and a low minimum temperature of a nematic phase. The invention provides a liquid crystal display device which has a short response time, a small power consumption, a small driving voltage, and a large contrast, and can be used in a wide temperature range.

The liquid crystal compound is a halogeno-benzene derivative having a trifluoropropenyl group or trifluoropropynyl group at a side chain, such as, for example, trans-4′-[3,5-difluoro-4-(3,3,3-trifluoropropenyl)phenyl]-trans-4-propylbicyclohexyl. The liquid crystal composition contains a compound which is this derivative. The liquid crystal display device uses this liquid crystal composition.

A liquid crystal compound is provided that has excellent characteristics, such as a negatively large dielectric anisotropy. A liquid crystal composition containing the compound, and a liquid crystal display device containing the composition are also provided. A compound having the three factors, i.e., (1) a tetrahydropyran ring, (2) —CH₂O— or —OCH₂— and (3)

exhibits excellent characteristics including a negatively large dielectric anisotropy. The use of the compound having the characteristics provides an excellent liquid crystal composition and an excellent liquid crystal display device.

In an electrochromic unit and a display device using the electrochromic unit, the electrochromic unit includes a first transparent substrate, a second transparent substrate, and a transparent conductive element and an electrochromic layer formed between the substrates, and electrons are used for changing the valence of ions of an electrochromic material, such that a reduction is resulted by supplying electrons and an oxidation is resulted by removing electrons to change colors, and the electrochromic coloration rate is quicker and more uniform and the driving voltage is smaller than those of the present existing electrochromic materials. A coloration/decoloration electrochromism can be achieved in a different way than the method of applying the dual addition and dual removal of ions and electrons in organic/inorganic electrochromic material.

The present invention relates to a display device (1A) including a plurality of display elements (10A) formed on a substrate (2A). Each of the display elements (10A) includes an organic segment (4A) containing an organic compound which generates light upon application of an electric field, and a first and a second electrode elements (3A, 5A) for applying the electric field to the organic segment (4A). The first electrode segment (3A), the organic segment (4A) and the second electrode segment (4A) are formed on the substrate (2A). In this case, the second electrode segment (5A) is provided with an opening (52A) for allowing passage of light generated in the organic segment (4A). The first and second electrode segments may be formed adjacent to each other in a plane parallel to the substrate. In this case, the organic segment is formed so as to cover both the first and second electrode elements.

The present invention relates to a display sheet comprising a substrate for carrying layers of material, an imaging layer comprising a bistable polymer dispersed cholesteric liquid crystal imaging layer, a first patterned transparent conductor disposed on one side of the bistable polymer dispersed cholesteric liquid crystal imaging layer, a field blooming color filter layer, and a second patterned electrode on the side of the bistable polymer dispersed cholesteric liquid crystal imaging layer opposite the first patterned conductor and a method for making the same.

An organic light emitting apparatus comprising a substrate and a plurality of organic light emitting devices having different emission colors to each other formed on the substrate, each of the plurality of organic light emitting devices including a cathode, an electron injection layer which is in contact with the cathode, organic compound layers including a light emitting layer, and an optically-transparent anode, the electron injection layer including an organic compound and at least one of an alkali metal, an alkaline earth metal, an alkali metal compound, and an alkaline earth metal compound. The electron injection layer has a thickness adjusted for each of the different emission colors so that each of the plurality of organic light emitting devices having the different emission colors enhances light emitted from the light emitting layer.

The invention provides a liquid crystal compound which has stability to heat, light and so forth, a nematic phase in a wide temperature range, a small viscosity, a large optical anisotropy, and a suitable elastic constant K₃₃, and further has a suitable and negative dielectric anisotropy and an excellent compatibility with other liquid crystal compounds. Moreover, the invention provides a liquid crystal composition comprising this liquid crystal compound and a liquid crystal display device containing this liquid crystal composition.

A liquid crystal compound represented by formula (a):

for example, R¹ and R² are alkyl having 1 to 10 carbons, alkenyl having 2 to 10 carbons or alkoxy having 1 to 9 carbons; ring A¹ and ring A² are 1,4-phenylene or trans-1,4-cyclohexylene; L¹ and L² are hydrogen or fluorine, and at least one of L¹ and L² is fluorine; and Z¹ and Z² are a single bond, —(CH₂)₂—, —CH═CH—, —CH₂O— or —OCH₂—.

A liquid crystal display comprises: a first substrate; a second substrate facing the first substrate; a liquid crystal layer formed between the first substrate and the second substrate, a first electrode formed on one of the first substrate and the second substrate, and a second electrode formed on one of the first substrate and the second substrate. The second electrode forms an electric field to a liquid crystal layer along with the first electrode, and the liquid crystal layer comprises about 25-35 wt % of a compound represented by Chemical Formula 1, and about 9-11 wt % of a compound represented by Chemical Formula 8.

There is provided a semiconductor light emitting semiconductor device including an n-side electrode which has a structure capable of stably suppressing the contact resistance between the n-side electrode and a nitride semiconductor layer. Further, there is provided a light emitting device and a manufacturing method wherein an ohmic contact between the n-side electrode and the nitride semiconductor layer can be obtained by a simple manufacturing process, and the n-side electrode has an Au layer on a top surface to facilitate wire bonding. Semiconductor layers (2-8) to form a light emitting layer are laminated on a surface of a substrate (1) made of, for example, a sapphire (Al₂O₃ single crystal) or the like and a p-side electrode (10) is formed on the surface thereof thorough a light transmitting conductive layer (9). An n-side electrode (11) is formed on an exposed surface of an n-type layer (4), exposed by removing a part of the semiconductor layers (4-8) by etching. The n-side electrode includes actually an Al layer (11a) in contact with the n-type layer, a barrier metal layer (11b) and an Au layer (11c).

The present invention relates to the field of display technologies, and particularly to a fused polycyclic compound, and a preparation method and use thereof. The fused polycyclic compound provided in the present invention has a structure of General Formula IV. The structure of the compound has ambipolarity, and the HOMO level and the LUMO level of the host material are respectively located on different electron donating group and electron withdrawing group, such that the transport of charges and holes in the host material becomes more balanced, thereby expanding the area where holes and electrons are recombined in the light emitting layer, reducing the exciton concentration, preventing the triplet-triplet annihilation of the device, and improving the efficiency of the device.