Abstract: A polysilicon resistor is disclosed, to reduce a voltage coefficient of the polysilicon resistor. The polysilicon resistor includes: a polysilicon layer (101), a voltage module (102), and a substrate layer (103), where the voltage module (102) is configured to transmit a voltage on the polysilicon layer (101) to the substrate layer (103).

Abstract: The present invention relates to a preparation and purification method for cationic quaternary ammonium salt of sodium hyaluronate in homogeneous medium. By adding a homogeneous solvent and a sodium hyaluronate solid to a vessel, heating the vessel until the contents are dissolved to form a homogeneous system, adding an aqueous solution of 2,3-epoxypropyltrimethylammonium chloride (GTA) to the homogeneous system, then adding a base catalyst, and stirring at a preset temperature to carry out a graft reaction, a graft product is obtained wherein 2,3-epoxypropyltrimethylammonium chloride is grafted to the oxygen atom of the hydroxymethyl group of sodium hyaluronate. By using the method, a graft product wherein 2,3-epoxypropyltrimethylammonium chloride is grafted to the oxygen atom of the hydroxymethyl group of sodium hyaluronate is obtained. Addition of salts is avoided during the reaction, a grafting yield up to 0.69 is obtained, and coagulation occurred to the product is effectively solved.

Abstract: The present invention discloses a method for constructing and optimizing a molecular structure model of lignite, comprising: collecting and processing a lignite sample, analyzing a lignite experimental sample, calculating the number of carbon atoms in lignite and the number of carbon atoms in other parameters, obtaining the sizes of aromatic clusters, and determining the composition features and number of aromatic structural units in lignite; calculating the total number of carbon atoms and the number of aliphatic carbon atoms in lignite; obtaining the categories and number of oxygen-containing functional groups in lignite based on the contents of aromatic hydrocarbon, aliphatic hydrocarbon and various oxygen-containing functional groups, and designing the structural forms of nitrogen and sulfur; constructing a molecular structure model of lignite.

Abstract: The present invention relates to a preparation method for acetylated sodium hyaluronate, which pertains to the field of organic chemical synthesis, characterized in that, the preparation method includes the following steps: in the protective atmosphere of inert gas, subjecting a hyaluronate and an acetic anhydride to a catalytic reaction in an organic solvent with a catalyst added, adding a water absorbent during the reaction, obtaining a reaction liquid, subjecting a reaction liquid to post treatment, separation, purification, and drying to obtain a product. A too high or too low degree of substitution is effectively avoided in the present invention, so as to obtain a product with a degree of substitution of acetyl groups ranging from 2.7 to 3.2, with mild reactive materials and reacting conditions, and simple separation and purification steps.

Abstract: A pixel driving circuit and a method for controlling the same, and a display apparatus are provided. The pixel driving circuit includes a charge storage circuit, a driving circuit and first to third switching circuits. The first switching circuit includes first to third switching elements. Control electrodes of the first and third switching elements are coupled to a reset signal terminal. First electrode of the third switching element is coupled to a fourth node. Second electrode of the second switching element is coupled to a third node. The charge storage circuit includes capacitors coupled in parallel or in series. The first switching circuit is turned on in a first phase and turned off in second and third phases. The second switching circuit is turned off in the first and second phases and turned on in the third phase.

Abstract: A pixel driving circuit and a method for controlling the same, and a display apparatus are provided. The pixel driving circuit includes a charge storage circuit, a driving circuit and first to third switching circuits. The first switching circuit includes first to third switching elements. Control electrodes of the first and third switching elements are coupled to a reset signal terminal. First electrode of the third switching element is coupled to a fourth node. Second electrode of the second switching element is coupled to a third node. The charge storage circuit includes capacitors coupled in parallel or in series. The first switching circuit is turned on in a first phase and turned off in second and third phases. The second switching circuit is turned off in the first and second phases and turned on in the third phase.

Abstract: The present application provides mask plate, fabrication method thereof, and mask plate assembly. The mask plate includes two opening areas being respectively on different sides of mask pattern area along first direction, and two welding areas. One welding area is on a side of one opening area away from the mask pattern area along first direction, and the other welding area is on a side of the other opening area away from mask pattern area along first direction. Evaporation holes are arranged in mask unit, buffer holes are arranged in each opening area, and ratio of maximum dimension of buffer hole in any direction in plane where the mask plate is located to maximum dimension of evaporation hole in the direction is greater than 100. Buffer holes are distributed at equal intervals along a second direction, and second direction is in the plane and is perpendicular to first direction.

Abstract: A pixel driving circuit and a method for controlling the same, and a display apparatus are provided. The pixel driving circuit includes: a charge storage circuit having a first terminal electrically coupled to a first node, and a second terminal electrically coupled to a second node; a driving circuit electrically coupled to the first node, a third node, and a fourth node; a first switching circuit electrically coupled to a reset signal terminal, the first node, the second node, the third node, the fourth node, and an initialization signal terminal; a second switching circuit electrically coupled to a light-emitting signal terminal, a first voltage terminal, the fourth node, the third node, and a first electrode of a light emitting element; and a third switching circuit electrically coupled to a control electrode signal terminal, a data signal terminal, and the second node.

Abstract: A pixel driving circuit and a method for controlling the same, and a display apparatus are provided. The pixel driving circuit includes: a charge storage circuit having a first terminal electrically coupled to a first node, and a second terminal electrically coupled to a second node; a driving circuit electrically coupled to the first node, a third node, and a fourth node; a first switching circuit electrically coupled to a reset signal terminal, the first node, the second node, the third node, the fourth node, and an initialization signal terminal; a second switching circuit electrically coupled to a light-emitting signal terminal, a first voltage terminal, the fourth node, the third node, and a first electrode of a light emitting element; and a third switching circuit electrically coupled to a control electrode signal terminal, a data signal terminal, and the second node.

Abstract: An example audio play circuit includes a power supply module, a power amplifier, a coupling capacitor, a load, and a plosive suppression circuit. An output terminal of the power amplifier is connected to a first terminal of the coupling capacitor and an output terminal of the plosive suppression circuit, a second terminal of the coupling capacitor is connected to the load, and an output terminal of the power supply module is connected to a power supply terminal of the power amplifier and a power supply terminal of the plosive suppression circuit. The power supply module is configured to provide a direct current power supply voltage for the power amplifier and the plosive suppression circuit. When the direct current power supply voltage rises to the first voltage threshold, the plosive suppression circuit connects the first terminal of the coupling capacitor to the ground terminal.

Abstract: A mask has a mask pattern region and a non-mask pattern region located at a peripheral of the mask pattern region. The mask pattern region includes at least one effective mask region. In any effective mask region, the mask includes a plurality of evaporation holes and at least one shielding strip. Each shielding strip is located between two adjacent evaporation holes. The mask has at least one welding region in the non-mask pattern region. A thickness of a portion of the mask in the non-mask pattern region and at least in the welding region is greater than a thickness of the shielding strip of the mask in the effective mask region, and the thickness refers to a dimension of the corresponding portion along a direction perpendicular to a plane where the mask is located.

Abstract: A mask and a mask assembly with the mask are disclosed. The mask includes: a mask pattern region; a non-mask pattern region around the mask pattern region; and two fixing areas disposed opposite to each other in a first direction in the non-mask pattern region and configured to fix the mask. There is a boundary line between the mask pattern region and the non-mask pattern region in the first direction, and an edge, along the boundary line, of the mask pattern region is concave towards an inner side of the mask pattern region in the first direction.

Abstract: The present disclosure discloses a manufacturing device of mask assembly including at least one mask, comprising a first stretching mechanism configured to clamp the edges of the mask in a first direction and stretch the mask in a second direction and a second stretching mechanism configured to clamp the edges of the mask in the second direction and stretch the mask in the first direction, wherein the first direction being perpendicular to the second direction. The disclosure also relates to a method of manufacturing a mask assembly and a mask assembly.

Abstract: A polysilicon resistor is disclosed, to reduce a voltage coefficient of the polysilicon resistor. The polysilicon resistor includes: a polysilicon layer (101), a voltage module (102), and a substrate layer (103), where the voltage module (102) is configured to transmit a voltage on the polysilicon layer (101) to the substrate layer (103).

Abstract: An audio processing circuit includes a cascade operational amplifier circuit, an output node, and a pull-down circuit. The cascade operational amplifier circuit includes a first operational amplifier circuit and a second operational amplifier circuit. The first operational amplifier circuit includes a main operational amplifier and a secondary operational amplifier that are connected in parallel. The pull-down circuit is configured to pull down a voltage at the output node after the first operational amplifier circuit is turned on. The second operational amplifier circuit is configured to, after the secondary operational amplifier is turned on, control a voltage gain of the secondary operational amplifier to change gradually from low to high.

Abstract: A pop sound suppression method, an audio output circuit, and a terminal suppress a pop sound that is generated when an audio output circuit is in an alternating current (AC) coupling structure. The output circuit includes an output power amplifier, a common-mode voltage buffer, a reference voltage generation circuit, a powered-on pop sound suppression switch, and a common-mode switch. The powered-on pop sound suppression switch is configured to control, in a power-on process of the audio output circuit, a voltage level of an output node to be zero. The common-mode switch is configured to control, when a reference voltage level of the reference voltage generation circuit is zero, the voltage level of the output node to be equal to the reference level.

Abstract: An example audio play circuit includes a power supply module, a power amplifier, a coupling capacitor, a load, and a plosive suppression circuit. An output terminal of the power amplifier is connected to a first terminal of the coupling capacitor and an output terminal of the plosive suppression circuit, a second terminal of the coupling capacitor is connected to the load, and an output terminal of the power supply module is connected to a power supply terminal of the power amplifier and a power supply terminal of the plosive suppression circuit. The power supply module is configured to provide a direct current power supply voltage for the power amplifier and the plosive suppression circuit. When the direct current power supply voltage rises to the first voltage threshold, the plosive suppression circuit connects the first terminal of the coupling capacitor to the ground terminal.

Abstract: An audio processing circuit includes a cascade operational amplifier circuit, an output node, and a pull-down circuit. The cascade operational amplifier circuit includes a first operational amplifier circuit and a second operational amplifier circuit. The first operational amplifier circuit includes a main operational amplifier and a secondary operational amplifier that are connected in parallel. The pull-down circuit is configured to pull down a voltage at the output node after the first operational amplifier circuit is turned on. The second operational amplifier circuit is configured to, after the secondary operational amplifier is turned on, control a voltage gain of the secondary operational amplifier to change gradually from low to high.

Abstract: Embodiments of the present invention provide a digital-to-analog conversion circuit, where the digital-to-analog conversion circuit includes a signal amplitude detector and a digital-to-analog converter. When the signal amplitude detector detects a low signal amplitude, a first current module in the digital-to-analog converter operates normally and a second current module in the digital-to-analog converter stops operating. In addition, when stopping operating, the second current module is in a state of a third bias voltage and a fourth bias voltage that are generated by a second bias circuit. When the amplitude detector detects a high signal amplitude subsequently, the second current module resumes normal operation. After operating normally, the second current module switches back to a first bias voltage and a second bias voltage that are generated by a first bias circuit. This reduces a nonlinearity problem caused before a second current module resumes normal operation.

Abstract: A circuit system including an operational amplification circuit is disclosed. The operational amplification circuit includes N stages of operational amplification units that are cascaded, an input terminal of the 1st stage of operational amplification unit is an input terminal of the operational amplification circuit, and an output terminal of the Nth stage of operational amplification unit is an output terminal of the operational amplification circuit; an output terminal of the ith stage of operational amplification unit is connected to an input terminal of the (i+1)th stage of operational amplification unit, so as to provide an input signal for the (i+1)th stage of operational amplification unit; and there is a feedback channel from the output terminal of the Nth stage of operational amplification unit to an input terminal of each of the 1st stage of operational amplification unit to the Nth stage of operational amplification unit.