402results about How to "High voltage retention" patented technology

The invention discloses a nematic phase liquid crystal composition comprising a compound with a first component shown as the general formula I, a compound with a second component shown as the general formula II, a compound with a third component shown as the general formula III, a compound with a fourth component shown as the general formula IV and a compound with a fifth component shown as the general formula V. The nematic phase liquid crystal composition disclosed by the invention has very low overall response time, lower voltage, high resistivity and voltage retention rate, low viscosity, short response time and proper optical anisotropy and dielectric anisotropy; after being treated at high temperature, the nematic phase liquid crystal composition still has high resistivity and excellent high temperature and ultraviolet stability, can be used for a photoelectric display with an active matrix address, and is particularly suitable for manufacturing active matrix TN-TFT (Twisted Nematic Thin Film Transistor) and IPS-TFT (In-Plane Switching Thin Film Transistor) liquid crystal display elements and liquid crystal displays which are rapid in response.

A liquid crystal alignment solution is provided. The liquid crystal alignment solution includes at least one polymer selected from the group consisting of a polyamide acid-polyamide acid polymer represented by formula (A), a polyimide-polyamide acid polymer represented by formula (B) and a polyimide-polyimide polymer represented by formula (C),

in which T¹ and T² are each independently a tetravalent organic group; m<n; p<q; r<s; and at least one of D¹ and D² is selected from the group consisting of formulae (1) to (15).

The invention discloses a positive dielectric anisotropy liquid crystal combination with rapid response. The positive dielectric anisotropy liquid crystal combination comprises 5-60 percent of first component, 1-50 percent of second component, 1-40 percent of third component, 0-40 percent of fourth component and an optically active compound, wherein the first component is formed from compounds with a structural formula I and a structural formula II, a compound with a structural formula III is used as the second component, a compound with a structural formula VI is used as the third component, a compound with a structural formula V is used as the fourth component, and the mass of the optically active compound is 0-0.2 percent of the mass sum of the liquid crystal combination. The liquid crystal combination has high charge retention, larger positive dielectric anisotropy, higher clearing point, good low-temperature stability, lower rotary viscometer and higher response speed and is particularly suitable for manufacturing active matrixes TN-TFT(Twisted Nematic-Thin Film Transistor), IPS (In-Plane Switching)-TFT liquid crystal display elements and liquid crystal displays.

The invention discloses a liquid crystal composite containing a difluorooxymethylene bridge polar monomer compound. The liquid crystal composite comprises the following components in percentage by weight: 1%-40% of compounds shown in a general formula I, 1%-40% of compounds shown in a general formula II, 5%-70% of compounds shown in a general formula III, 1%-60% of compounds shown in a general formula IV, 0%-20% of compounds shown in a general formula V and 0%-20% of compounds shown in a general formula VI. The liquid crystal composite disclosed by the invention has the characteristics of high response speed, low driving voltage and high resistivity and voltage conservation rate, has the capability of improving the viewing angle of a liquid crystal display by heightening the pretilt angle of a liquid crystal in a display and is suitable for a fast-responsive TFT-LCD (Thin Film Transistor Liquid Crystal Display).

The invention relates to a color film base plate and a manufacturing method thereof. The color film base plate comprises a first black matrix, color resin, a protecting layer and a common electrode which are formed on a base plate, wherein a second black matrix for preventing the reflecting light of the first black matrix from projecting into an array base plate TFT (Thin Film Transistor) channel region is formed on the protecting layer. The manufacturing method of the color film base plate comprises the following steps of: forming a pattern comprising the first black matrix and the color resin on the base plate; forming a pattern comprising the protecting layer and the second black matrix; and forming a pattern comprising the common electrode. By mounting two layers of black matrix patterns, the second black matrix can effectively block the reflecting light reflected from the surface of the first black matrix, which enables the reflecting light reflected from the surface of the first black matrix not to project into the TFT channel region, thereby effectively avoiding the generation of leakage current, improving the retention rate and contrast ratio of voltage at maximum, and enhancing the quality of a liquid crystal display.

The invention provides a liquid crystal alignment agent for photo alignment, a liquid crystal alignment layer for photo alignment, and a liquid crystal display element. The liquid crystal alignment agent provided by the invention has a polyamide acid or a derivative thereof, the polyamide acid or the derivative thereof may be formed by reacting a mixer of cyclobutane tetracarboxylic dianhydride or tetracarboxylic dianhydride with specific aromatic diamine of an alkyl chain of a molecule with a carbon number larger than 4. With the adoption of the liquid crystal alignment agent, a liquid crystal alignment layer good in sensitivity of chemical change caused by light irradiation, excellent in alignment property of liquid molecule and high in optical transmittivity is formed. In addition, by applying the photo alignment layer to the liquid crystal display element, the liquid crystal display element with excellent display characteristics can be obtained.

The invention provides a pixel driving circuit and a driving method thereof, a display panel and a display device, is applied to the technical field of display, solves the problem that the voltage retention rate of a capacitor in a conventional pixel driving circuit is insufficient. The pixel driving circuit comprises an energy storage sub-circuit, a reset sub-circuit, a compensation sub-circuit,a driving sub-circuit and an electric leakage suppression sub-circuit, wherein the energy storage sub-circuit is coupled with a first node and a second node; the reset sub-circuit is coupled with thesecond node, a first scanning time sequence signal end and an initialization signal end; the compensation sub-circuit is coupled with the second node, a third node and a second scanning time sequencesignal end; the driving sub-circuit is coupled with the second node, the third node and the first voltage signal end; and the electric leakage suppression sub-circuit is coupled with the energy storage sub-circuit, the reset sub-circuit and the compensation sub-circuit. The electric leakage suppression sub-circuit is configured to suppress electric leakage of the energy storage sub-circuit in theprocess of generating and transmitting the driving signal by the driving sub-circuit. The pixel driving circuit is used in the display device.

The invention discloses a pixel circuit, a display panel and a display device. According to the invention, by adjusting the magnitude ratio of a first compensation capacitor to a second compensation capacitor added in a pixel circuit , the voltage of a third node and the voltage of a fourth node can be adjusted, the voltage of the third node is made greater than that of the first node, and the voltage of the fourth node is made smaller than the voltage of the first node, thus, the third node reversely charges the first node and the first node leaks electricity to the fourth node; therefore, complementation of the charging process and the electric leakage process of the first node can be realized, so that the potential of the first node is balanced, electric leakage of the first node can bereduced, the signal voltage retention rate of a storage capacitor in a pixel circuit is improved, flicker-free display and low-frame-frequency driving are realized, and the display quality of a display product is further improved.

A liquid crystal alignment solution is provided. The liquid crystal alignment solution includes a first polyimide-polyamide acid and a second polyimide-polyamide acid. The first polyimide-polyamide acid is represented by formula (A),

and the second polyimide-polyamide acid is represented by formula (B),

in which T¹, T², T³ and T⁴ are each independently a tetravalent residue of a tetracarboxylic acid dianhydride; D¹, D², D³ and D⁴ are each independently a divalent residue of a diamine; and m, n, p and q are each independently an positive integer,

wherein m/(m+n)≦0.5 and p/(p+q)≧0.5.

The invention relates to a liquid crystal composition which contains a pentafluoropropylene ether end group structure liquid crystal compound. The invention further relates to an application of the liquid crystal composition. The liquid crystal composition is excellent in property, has high dielectric anisotropy and low rotary viscosity, and is applicable to liquid crystal displays with display modes of IPS, FFS (fringe field switching), ADS and the like and TN-TFT (twisted nematic-thin film transistor) liquid crystal displays with low driving voltage.

The present invention provides a positive-type radiation-sensitive composition containing (A) a siloxane polymer, and (B) a quinone diazide compound, in which the content of aryl groups relative to Si atoms in the siloxane polymer (A) is greater than 60% by mole and no greater than 95% by mole.

The invention provides a liquid crystal composition for TFT (Thin-Film Transistor) display. The liquid crystal composition is prepared from the following components in percentage by weight: 1-40 percent of I-type compound, 1-70 percent of II-type compound, 1-40 percent of III-type compound, 0-45 percent of IV-type compound and 0-20 percent of V-type compound. The liquid crystal composition has excellent performance, extremely low total response time (ttot=ton+toff), lower voltage, high resistance ratio and voltage retention ratio, and can also have different threshold voltages, clearing points and delta n characteristics by adjusting the contents of the components, thereby being particularly suitable for manufacturing rapid-response TN-TFT liquid crystal displays.

The present invention provides a polyimide alignment film having excellent electrical properties and excellent reliability for use in the field of electronic materials which comprises a polyimide resin produced from a polyamic acid composition comprising a polyamic acid forming a polyimide resin of a low residual voltage and a high voltage holding ratio, and a polyamic acid forming a polyimide resin of a large pre-tilt angle, blended them in the ratio of the former to the latter of 50/50 to 95/5 (weight ratio), a polyamic acid composition for providing such a polyimide aligning film and a liquid crystal display element produced from such an aligning film.

The invention provides liquid crystal alignment agents for photo-alignment, liquid crystal photo-alignment layers, and liquid crystal displays using the same. The liquid crystal alignment agents contain tetracarboxylic dianhydride mixture including cyclopentane tetracarboxylic dianhydride, which is reacted with specific diamine to obtain polyamide acid or its derivatives. The liquid crystal alignment agents are applied to form a photo-alignment film with excellent alignment property and high light transmittance, because of light sensitivity of the chemical change caused by illumination. In addition, the photo-alignment film is applied in liquid crystal displays, the electrical characteristics required by liquid crystal alignment film is satisfied, the voltage maintaince ratio is high, the iron amount is little, the remained charge amount is little, etc.

The present invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and liquid crystal display. The liquid crystal alignment agent contains reaction product of tetracarboxylic dianhydride and diamine, that is polyamic acid or its derivative. The liquid crystal alignment film is acquired with the liquid crystal alignment agent. The liquid crystal display comprises a pair of substrates, liquid crystal molecule forming liquid crystal layer between the substrates, electrodes applying voltage to the liquid crystal layer, liquid crystal alignment film making the liquid crystal molecule align in certain direction. The invention provides a liquid crystal alignment film with high-maintenance ratio of voltage, low-remnant DC, and larger delay, also provides a liquid crystal display having the liquid crystal alignment film, excellent contrast, wherein image retention may not be generated.

An object is to provide a liquid crystal compound having high polymerization reactivity, a high conversion ratio and high solubility in a liquid crystal composition, a polymerizable composition containing the compound, a liquid crystal composite prepared using the composition, and a liquid crystal display device having the composite. A solution is a polymerizable compound represented by formula (1).

In formula (1), P¹ and P² are identically group (P-1), (P-2) or (P-3), and in formula (P-1), M is hydrogen, fluorine, —CH₃ or —CF₃;

S¹ and S² are a single bond, alkylene having 1 to 6 carbons or the like; a1, a2 and b1 are 0, 1, 2, 3 or 4, and a sum of al and a2 is 4; ring A¹ is naphthalene, anthracene or phenanthrene; and ring A² is cyclohexyl, phenyl, naphthyl, anthracenyl or phenanthrenyl; and Z¹ is a single bond, —CO—, —COO— or the like.

A diamine compound is proposed as well as polymers, copolymers, polyamic acids, polyamic acid esters, or polyimides based on such compound. The compound is represented by one of the general formulae (Ia) and (Ib). It could be shown that such structures, in particular for a specific choice of the residue B, provide, if e.g. used as orientation layers, a photostable, vertically aligning material with an improved VHR.

An electric double layer capacitor having a pair of polarized electrodes and an electrolytic solution capable of forming an electric double layer at the interface with the polarized electrodes, wherein the electrolytic solution is an organic electrolytic solution containing a fluorobenzene of the formula 1:

wherein n is an integer of from 1 to 6.

A liquid crystal composition is provided that has a wide temperature range of a nematic phase, a suitable optical anisotropy, a large negative dielectric anisotropy and a large specific resistance, and preferably a liquid crystal composition is provided that has a larger optical anisotropy and a lower minimum temperature of a nematic phase while satisfying the aforementioned characteristics. A liquid crystal display device containing the liquid crystal composition is also provided. The liquid crystal composition contains a liquid crystal compound having terphenyl, in which one or two hydrogens are replaced by fluorines, as the first component, and a liquid crystal compound having phenylene, in which two hydrogens are replaced by fluorine, as the second component, and the liquid crystal display device contains the liquid crystal composition.

The subject is to provide a liquid crystal composition that satisfies at least one characteristic among characteristics such as a high maximum temperature of a nematic phase, a low minimum temperature of a nematic phase, a low viscosity, a suitable optical anisotropy, a negatively large dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light and a high stability to heat, or that is suitably balanced regarding two or more characteristics. The subject is to provide an AM device that has a short response time, a high voltage holding ratio, a high contrast ratio, a long service life and so forth.

The invention provides a liquid crystal composition having a negative dielectric anisotropy that contains a specific compound having a negatively large dielectric anisotropy as a first component, and a two-ring compound having a low viscosity as a second component, and may contain a specific compound having a low viscosity as a third component and/or a specific compound having a negatively large dielectric anisotropy as a fourth component, and provide a liquid crystal display device containing the composition.

The subject is to provide a liquid crystal composition that satisfies at least one characteristic among characteristics such as a high maximum temperature of a nematic phase, a low minimum temperature of a nematic phase, a low viscosity, a suitable optical anisotropy, a negatively large dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light and a high stability to heat, or that is suitably balanced regarding two or more characteristics. The subject is to provide an AM device that has a short response time, a high voltage holding ratio, a high contrast ratio, a long service life and so forth.

The invention provides a liquid crystal composition having a negative dielectric anisotropy that contains a specific compound having a negatively large dielectric anisotropy as a first component, and a specific two-ring compound having a low viscosity as a second component, and provides a liquid crystal display device containing the composition.