168 results about "Charge compensation" patented technology

The invention relates to the technical field of quartz sand purification processing, in particular to a purification process for improving the sodium ion removal rate of high-purity quartz sand. The technology aims at solving the technical problems that when soluble sodium salt and lattice embedded state sodium (such as Al < 3 + > charge compensation type) coexist in high-purity quartz sand, removal is not thorough through a traditional technology, and precipitates are likely to be generated. Efficient removal is achieved through a hydrothermal dissolution-acid pickling impurity removal-flotation separation synergistic mechanism. Firstly, soluble sodium salt is dissolved out preferentially under the hydrothermal condition of 65 DEG C, so that it is avoided that in subsequent acid pickling, HF reacts with the sodium salt to generate Na2SiF6 sediment; then, an HF-HCl mixed acid system is adopted to selectively etch lattice channels at 70 DEG C and open a gas-liquid inclusion, so that embedded sodium is promoted to migrate and dissolve out; and finally, separating sodium-containing gangue (such as albite) exposed by pickling through flotation. According to the process, the hydrothermal times (2-3 times) can be dynamically adjusted according to the ore characteristics, stable production of semiconductor-grade quartz sand is achieved with low energy consumption which saves more than 30% of energy compared with a chloridizing roasting process, and the process is suitable for high-valued utilization of domestic vein quartz ore.

The invention discloses a control method of a PTC heater, a battery device, a vehicle and a storage medium, and the control method comprises the steps: controlling the heater to carry out gear switching to enter a preheating mode to heat the battery when the remaining electric quantity of the battery is lower than a first preset electric quantity and the current temperature of the battery is lower than a first preset temperature; when the battery enters the charging compensation mode, controlling the heater to carry out gear switching to cooperate with the battery to carry out charging compensation; when the remaining electric quantity of the battery is larger than or equal to second preset electric quantity, the heater is controlled to conduct gear switching to enter a maximum power mode to heat the battery, and the second preset electric quantity is larger than the first preset electric quantity. The heater can heat the battery when the battery is at the preset environment temperature such as low temperature, the performance of the battery and / or the heater is improved, the working mode of the heater is dynamically determined, and the working mode of the heater is dynamically switched, so that the heater heats the battery in the target working mode and / or cooperates with the battery for charging compensation.

The invention discloses a barium ion single-doped / double-doped brookite titanium dioxide nanorod catalyst as well as preparation and application, the catalyst synthesized by a thermal decomposition method comprises brookite phase titanium dioxide and doped barium ions, and the nanorod-shaped catalyst containing oxygen vacancy defects has the width of 4-6 nanometers and the length of 20-50 nanometers. The piezoelectric property of brookite titanium dioxide is induced through doping of barium ions, charge separation is promoted through a built-in electric field, meanwhile, oxygen vacancies are induced through a charge compensation mechanism, the piezoelectric catalysis and photocatalytic efficiency is promoted, and the problems mentioned in the background technology are solved.

The invention relates to the technical field of silicon carbide semiconductor devices, in particular to an integrally-formed equal-depth double-groove SiC MOSFET structure and a preparation method thereof. According to the structure, an N + buffer layer and an N-drift layer are sequentially formed on an N-type SiC substrate, and a main groove and an auxiliary groove which are consistent in depth are formed in the surface of the N-type SiC substrate; a gate oxide layer and a polycrystalline silicon gate are sequentially formed in the main groove, and the auxiliary groove is filled with a SiC epitaxial material which is doped with the drift layer in the same type, so that a charge compensation and electric field regulation and control unit is formed; the P-type body region surrounds the trench structure and forms an N + source region, and the drain electrode is formed through a back metallization process. Through the collaborative design of the equal-depth double grooves, the uniformization of electric field distribution is realized, the on-resistance and the switching loss are effectively reduced, the thermal stability and the reliability of the device are improved, the integrated process is adopted for integration, the process is simplified, the production efficiency and the yield are improved, and the semiconductor device is suitable for high-frequency and high-voltage application scenes and has a wide industrialization prospect.

The invention belongs to the technical field of nano fluorescent powder, and particularly relates to Ca10 (PO4) 6 (OH) 2: RE < 3 + > nano fluorescent powder as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing Ca (NO3) 2 and RE (NO3) 3 solutions in proportion to prepare a cation solution, dropwise adding a certain amount of H3PO4 to prepare a mixed solution, adjusting the pH value by using a charge compensation agent, uniformly stirring, performing ultrasonic dispersion, performing hydrothermal reaction on the obtained solution, and purifying to obtain the final product Ca10 (PO4) 6 (OH) 2: RE < 3 + > nano fluorescent powder. The charge compensation agent is at least one of KOH and LiOH. By utilizing the methods, the invention provides the Ca10 (PO4) 6 (OH) 2: RE3 + nano fluorescent powder taking K < + > / Li < + > as the charge compensation agent, and the Ca10 (PO4) 6 (OH) 2: RE3 + nano fluorescent powder has the advantages of thermal stability, color stability and high luminescence, and is suitable for temperature sensing, cheilogramma and anti-counterfeiting detection.

The invention provides a chromium-titanium bimetallic layered sulfide positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The chemical general formula of the material is LiCrxTiyS2, x + y = 1, the material belongs to a hexagonal crystal system O1 type structure, and the space group is Pm1. Microtopography analysis shows that the material is granular, the particle size distribution is 2-15 [mu] m, the particle surface has a layered structure characteristic, and each element is uniformly distributed on the particle surface and in a bulk phase. The capacity of the material mainly comes from oxidation reduction between titanium and sulfur, and chromium has the effect of stabilizing a structural framework and does not participate in the charge compensation process. Electrochemical analysis shows that the reversible capacity of the LiCr2 / 3Ti1 / 3S2 positive electrode material reaches up to 223 mAh g <-1 > and is close to the theoretical value of the positive electrode material of the system. In addition, the material shows excellent rate capability and cycling stability, and still keeps the capacity retention ratio of 80% after 330 times of cycling.

The invention relates to the technical field of sensors, and discloses a capacitive touch detection circuit and method.The capacitive touch detection circuit comprises a charge compensation module, a voltage and current conversion module, an integrating capacitor, a quantization circuit module and a counter; the charge compensation module is used for performing charge and discharge compensation on the external touch capacitor and adjusting the charge quantity on the touch capacitor to be within a preset charge quantity range corresponding to the reference voltage; the voltage and current conversion module is used for converting residual charges on the touch capacitor compensated by the charge compensation module into current and outputting the current; the integrating capacitor is used for integrating the current to obtain an integrated voltage; the quantization circuit module is used for quantizing the integral voltage and controlling the integral voltage to be stabilized in a preset voltage range of the reference voltage; and the counter is used for counting the output of the quantization circuit module to obtain a digital code representing a touch capacitance value. According to the invention, the touch detection performance with high linearity, low power consumption, small area and high noise resistance can be realized.

The invention provides a doped and coated lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. The lithium nickel manganese oxide positive electrode material comprises lithium nickel manganese oxide particles, the coating layer contains an F and P double-doped carbon material, and the coating layer is positioned on the outer side of the lithium nickel manganese oxide particle; wherein the coating layer contains F and P, the electron withdrawing effect of F is relatively strong, the electron activity of the coating layer can be reduced, and electrolyte decomposition and Mn < 2 + > oxidation can be inhibited; meanwhile, the compactness of the coating layer can be improved through P doping, Mn < 2 + > on the surface of the coating layer is balanced through charge compensation, and the situation of manganese dissolution is reduced, so that the cycle life of the battery is prolonged.

The invention discloses a Micro-LED device based on a charge compensation method and a preparation method of the Micro-LED device, relates to the technical field of nano luminescent materials and display, and solves the problems that the luminous efficiency of the Micro-LED device is reduced, the driving voltage is increased, the service life of the device is shortened and the like due to reduction of the crystal size during Mn < 4 + > doped fluoride nanocrystalline through Mg < 2 + > charge compensation. The Micro-LED device sequentially comprises a driving substrate layer, a blue light Micro-LED array layer, a light extraction layer, a color conversion layer and a packaging layer from bottom to top; the light extraction layer is a titanium dioxide nanoparticle layer; the color conversion layer is a Micro-LED device formed by mixing a solution of dispersed silver silicon core shell-cesium sodium manganese fluoride composite nanomaterial Ag (at) SiO2 / Cs2NaF6: Mn < 4 + > and Mg < 2 + > nanocrystal particles with a methyl methacrylate solution and coating the mixture on a substrate. By introducing the Micro-LED color conversion layer based on the charge compensation method, lattice charge unbalance is neutralized, lattice defects are reduced, and formation of a Micro-LED device with high brightness and high stability is facilitated.

The invention discloses a charge compensation MOSFET with a graded epitaxial distribution and a method of manufacturing the same. A vertical power semiconductor transistor device includes: a drain region of a first conductivity type; a body region of a second conductivity type; a drift region of the first conductivity type separating the body region from the drain region; a source region of the first conductivity type separated from the drift region by the body region; a gate trench extending through the source region and the body region and into the drift region, the gate trench including a gate electrode; and a field electrode in the gate trench or in the separate trench. The drift region has a generally linearly tapered first doping profile that increases from the body region toward a bottom of the trench including the field electrode, and a tapered second doping profile that increases from an end of the first doping profile toward the drain region at a greater ratio than the first doping profile.

The invention discloses a multi-wavelength light-induced photoelectron charge compensation device and method for SIMS analysis, and the device comprises an adjustable wavelength light source which is used for generating light of which the wavelength is adjustable in a range from ultraviolet to visible light; the optical system is used for guiding the light generated by the adjustable wavelength light source to the surface of a sample bombarded by an SIMS primary ion beam, and ensuring that a photon beam spot is accurately overlapped with an ion beam bombarded area; and the control unit is used for dynamically adjusting the wavelength and the light intensity of the adjustable wavelength light source according to the stability of the SIMS secondary ion signal so as to optimize photoelectron emission and realize charge neutralization. The invention has the following beneficial effects: the technical scheme avoids physical damage of the electron gun to the sample and damage to the vacuum environment; the wavelength can be adjusted to cover ultraviolet light to visible light, and the device is suitable for various materials.

The application discloses a charging compensation method and device of a display panel. The method comprises the following steps: adjusting charging sequences of multiple rows of sub-pixels; charging the multiple rows of sub-pixels in sequence according to the adjusted charging sequences, so that the display panel displays a light-load picture of a single color; charging the multiple rows of sub-pixels in sequence according to the adjusted charging sequences, so that the display panel displays a heavy-load picture of the single color; and performing charging compensation on the heavy-load picture of the display panel according to the light-load picture. The application can improve the charging compensation effect of the display panel, and further improve the display effect of the display panel.

The present invention provides a charge distribution compensation circuit and method based on a touch sensing channel. The circuit includes: a compensation transfer unit that receives a square wave signal, processes it, generates and outputs compensation charges; a distribution unit that receives the compensation charges and transmits them; a receiving unit that generates a reference charge amount and simultaneously receives the compensation charges output by the distribution unit, and outputs a net charge amount. Among them, the compensation transfer unit includes a charge transfer device, and a multi-stage operational amplifier circuit is provided inside the charge transfer device. Through the cascaded design of the compensation transfer unit, the distribution unit and the receiving unit, a complete charge compensation path is formed, which can effectively achieve charge compensation in the touch channel. The compensation transfer unit adopts the structure of a charge transfer device with a multi-stage operational amplifier circuit, which improves the accuracy and stability of charge transfer, and makes the generation of compensation charges more accurate.

The invention discloses an up-conversion luminescence time sequence regulation color-changing material, color-changing ink and a preparation method and application thereof, the chemical general formula of the material is SrMoO4: xYb < 3 + >, yHo < 3 + > and zNa < + >, x is the molar doping amount of Yb < 3 + >, y is the molar doping amount of Ho < 3 + >, z is the molar doping amount of Na < + >, 0.10 < = x < = 0.40, 0.01 < = y < = 0.03, and 0.21 < = z < = 0.31. According to the material, under the condition of charge compensation ion Na < + > co-doping, the solid solubility of sensitizer ions Yb < 3 + > in SrMoO4 crystal lattices is remarkably improved, and under the condition of Na < + > excessive charge compensation, the material is remarkably superior to the upconversion luminescence effect of other charge compensation enhanced heterovalent doping systems reported in literatures; the color-changing ink for advanced dynamic anti-counterfeiting and the application method thereof are designed and developed by combining the remarkably enhanced up-conversion luminescence and the excellent time sequence regulation color-changing characteristic of the material, and the color-changing ink has a wide application prospect in the field of dynamic fluorescent anti-counterfeiting.

A semiconductor device includes a semiconductor layer having a first conductivity type, a well region within the semiconductor layer having a second conductivity type opposite to the first conductivity type, a source region having the first conductivity type within the well region, and a charge compensation region formed by injection below the well region within the semiconductor layer. The source region is adjacent to a channel region within the well region. A method for forming a semiconductor device includes forming a well region having a second conductivity type within a semiconductor layer having a first conductivity type opposite to the second conductivity type, forming a source region having the first conductivity type within the well region, and injecting ions into the semiconductor layer to form a charge compensation region below the well region within the semiconductor layer. The source region is adjacent to a channel region within the well region.

The invention provides a semiconductor device and a manufacturing method thereof, a drift region is arranged to be a layered structure along the height direction, a deep groove is formed in the drift region, a plurality of epitaxial layers are epitaxially grown layer by layer from the inner wall of the deep groove in the deep groove, and the doping type of each epitaxial layer is opposite to that of the drift region. The sub-drift layers are in first concentration distribution from bottom to top, and the epitaxial layers are in second concentration distribution from the inner wall of the deep trench to the center of the deep trench. Meanwhile, the first concentration distribution and the second concentration distribution have a layer-by-layer matching relationship. By means of the structure, on the transverse cross section of the semiconductor device, the doping concentration between the corresponding sub-drift layer and the epitaxial layer is mutually counteracted in the aspect of integration, so that a quasi-electric neutral region is formed near the side wall of the deep groove, and approximate transverse charge compensation is realized by the charge quantity in a local region. Therefore, the transverse charge balance is realized under the condition that the basic device structure is not changed, so that the compromise relationship between the breakdown voltage and the on-resistance is obviously optimized.

The application provides a preparation method of a specific stoichiometric ratio of O3 type layered sodium ion battery positive electrode material. By finely controlling the ratio of Ni, Fe and Mn, the main redox activity is controlled in a specific electric pair range, the structure stability and the electrochemical performance can be improved, and the phase transition can be effectively inhibited. The performance improvement is attributed to the favorable electronic structure given by the specific component ratio, which promotes the Mn 3+ / Mn 4+ and Fe 2+ / Fe 3+ redox couples to participate in cooperation, thereby expanding the charge compensation window and improving the structure stability. The precursor material is obtained by a simple coprecipitation method, and the obtained material has good consistency and low cost after further high-temperature calcination. The prepared sodium ion battery positive electrode material has excellent performance and is suitable for large-scale production.

The application discloses a method for improving the performance of oxide solid electrolyte by calcium doping, and belongs to the technical field of solid-state batteries. The method comprises the following steps: mixing raw materials containing a calcium source, a sodium source, a rare earth source and a phosphorus source to obtain a precursor; sintering the precursor to obtain a calcium-doped sodium superionic conductor precursor; and performing ion exchange on the precursor and a lithium salt to obtain a calcium-doped oxide solid electrolyte with a chemical formula of Li 3+ x La 1‑x Ca x (PO4)2, and 0 < x <= 0.1. By partially replacing lanthanum ions with calcium ions, lithium vacancies are introduced, the crystal lattice is relaxed, and the lithium ion migration path is optimized by using the charge compensation mechanism, so that the room-temperature ionic conductivity of the material is significantly improved. The method has low raw material cost, simple process and strong universality, can be expanded to various oxide solid electrolyte systems such as NASICON and garnet, and has good application prospect in the field of solid-state lithium ion batteries.

The application provides a chromium-titanium bimetallic layered sulfide positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. x Ti y S2, and x+y=1, belongs to a hexagonal O1 type structure, and a space group is Pm1. Micro-morphology analysis shows that the material is in a granular form, a particle size distribution is 2-15 mu m, a particle surface is in a layered structure feature, and each element is uniformly distributed on the particle surface and in a bulk phase. The capacity of the material is mainly derived from oxidation and reduction between titanium and sulfur, chromium has a stable structure frame effect, and does not participate in a charge compensation process. Electrochemical analysis shows that the LiCr 2 / 3 Ti 1 / 3 S2 positive electrode material has a reversible capacity of 223 mAh g ‑1 , and is close to a theoretical value of the system positive electrode material. In addition, the material shows excellent rate performance and cycle stability, and still maintains a capacity retention rate of 80% after 330 cycles.

The application relates to the technical field of semiconductor power devices, and discloses a SiC MOSFET structure with a low input capacitance and a STI structure and a manufacturing method thereof. The structure comprises a silicon carbide substrate, an N-type drift layer, a P well, and a heavily doped N region and a P region. A shallow groove is embedded in the surface of a JFET region between adjacent P wells, and a silicon dioxide layer is filled in the shallow groove to form a STI structure. The upper surface of the structure is flush with the upper surface of the unetched drift layer. The sidewall and the bottom of the shallow groove are covered with an N-type charge compensation layer with a higher doping concentration. A thin gate oxide layer covers the surface of the P well and the STI structure, and a gate electrode is arranged on the thin gate oxide layer. The application increases the insulating physical distance between the gate and the epitaxial layer by introducing the STI structure, reduces the parasitic capacitance and the high-frequency switching loss, compensates for the problem of the rise of the conduction resistance caused by the narrowing of the channel by using the N-type charge compensation layer, eliminates the physical step through surface planarization treatment, and improves the blocking withstand voltage level of the device.

The invention discloses a preparation method of an yttrium oxide-zirconium oxide composite coating, which comprises the following steps: step S11, mounting a cleaned and dried glass substrate on a rotary base frame table in a coating chamber, and introducing argon plasma into the coating chamber to bombard and clean the surface of the glass substrate; and S12, argon and oxygen are introduced into the coating chamber, and the yttrium target and the zirconium target are started at the same time for magnetron sputtering, so that the yttrium oxide-zirconium oxide composite coating is deposited on the surface of the glass substrate which rotates in a reciprocating manner. The charge compensation effect is introduced through Zr < 4 + > doping, so that the oxygen vacancy concentration in the coating is reduced, and the visible light transmittance and chemical stability of the coating are improved. And meanwhile, through formation of zirconium oxide, columnar crystal growth of yttrium oxide is broken, so that the microstructure of the coating is optimized, and the coating has good etching resistance.

The present application discloses a pre-charging method and device for a display screen, and a display device. The pre-charging method for the display screen includes: determining a pre-charging area in the display screen based on the driving voltage of each pixel in the display screen; determining a target grayscale value of a target pixel in the pre-charging area; adjusting the original grayscale value of the target pixel to the target grayscale value to obtain a pre-charged display screen. The embodiment of the present application implements local pre-charging compensation processing for the display screen, which can reduce the local drive load, occupy a smaller register, and reduce or eliminate in real time the horizontal crosstalk problem caused by insufficient working voltage drive of the display device, so as to avoid the appearance of single or multiple abnormal dark lines in the display screen.

A three-dimensional carrier stored trench IGBT and a manufacturing method thereof are provided. A P-type buried layer and a split gate electrode with equal potential to an emitter metal is introduced on the basis of the traditional carrier stored trench IGBT, which can effectively eliminate the influence of an N-type carrier stored layer on breakdown characteristics of the device through the charge compensation, and at the same time can reduce the on-state voltage drop and improve the trade-off relationship between the on-state voltage drop Vceon and the turn-off loss Eoff. The split gate electrodes is introduced in the Z-axis direction, so that the gate electrodes are distributed at intervals. Therefore, the channel density is reduced. The turning on of the parasitic PMOS has a potential-clamping effect on the NMOS channel, so that the saturation current can be reduced and a wider short-circuit safe operating area (SCSOA) can be obtained.

The application relates to the technical field of inorganic photoluminescence materials, and discloses a rare earth doped layered stannate-based white light fluorescent powder material and a preparation method thereof, a chemical molecular formula of which is A1-xSn2-xO6:Eu3+, wherein 0 < x <= 0.05, A is one or more divalent alkali earth metal ions in Ca, Sr and Ba, and is doped in different proportions, the A provides a red light emission component, the A provides a blue and yellow light emission component, the emission intensity of the red light and the blue and yellow light can be adjusted by regulating and the doping proportion, the ionic radius of the A is similar to that of the A, and the A substitutes the lattice position. Through the synergic doping of the A and the A and the proportion regulation, the charge compensation and the lattice position optimization of the A and the A are combined, the accurate matching of the red light and the blue and yellow light emission intensity of the fluorescent powder is realized, white light emission effects with excellent color rendering and stable color tone are obtained, and the problems of red light loss or light emission efficiency decay caused by the mixing of multi-color fluorescent powder in traditional white light LED fluorescent powder are effectively overcome.

The invention relates to the technical field of electron emission, and discloses a large-current pulse micro-channel plate electron emission source and an X-ray generation device. According to the electron emission source, an electron emission function layer at the head end of an MCP assembly is excited by adopting a rapidly regulated and controlled UV LED light source, and ultrafast time sequence modulation of electron beams is realized through an avalanche multiplication process of the electron beams in the MCP. By adopting a specific high-lead, low-alkali or alkali-free glass component or ceramic substrate composite functional film layer structure, the MCP assembly has long service life stability of low resistance, high current output and high power density operation. Independent bias voltage and gating voltage synchronous with electronic pulse are applied to the MCP assembly through the driving control unit, accurate thermal management is carried out in combination with a pulse-charging circulation mode, and the problems of charge compensation and thermal limitation under large current output are effectively solved. The electron emission source breaks through the bottleneck, supports peak current density exceeding 100 mA / cm under submicrosecond pulse, and realizes hundred microampere level steady-state current output under millisecond level long pulse.

The application relates to the technical field of battery materials, and discloses a lithium secondary battery positive electrode coating material as well as a preparation method and application thereof. 3+z Nb 1‑ x M x O 4‑y R y wherein M is selected from one of Fe, Ti, Mn, Mo, W, V, Ta and Cr; R is selected from one of F, Cl, Br and I; 0<=x<1, 0<=y<=4, and the values of x, y and z satisfy the charge balance of the positive electrode coating material. The application integrates the triple functions of thermodynamic interface protection, fast ion conduction and charge compensation in a single material through cation, anion or anion-cation co-doping design based on Li3NbO4 as a matrix; the positive electrode coating material can significantly reduce the solid-solid interface impedance in a full solid-state battery, improve the first circle coulomb efficiency, and greatly improve the long cycle stability of an electrode; meanwhile, the positive electrode coating material can effectively inhibit the decomposition of high-voltage electrolyte in a traditional liquid battery, and improve the cycle life of a positive electrode material.

The invention discloses a low-temperature charging compensation method and a new energy source vehicle. The low-temperature charging compensation method comprises the steps that whether the current lowest monomer temperature Tmin is lower than a preset low-temperature threshold value or not is judged; if yes, charging preheating is carried out, and charging compensation is carried out in the charging preheating process; and if not, a charging and heating stage is entered, the WPTC continuously works to heat the battery, the battery charging window is released, and the battery is allowed to be charged. According to the low-temperature charging compensation method and the new energy material source vehicle, when the current lowest monomer temperature Tmin is lower than the preset low-temperature threshold value, the charging preheating process based on the charging compensation strategy is carried out, the low-temperature charging efficiency of the new energy material source vehicle is improved, and the charging waiting time is shortened; the charging current value request problem when the battery temperature is below 0 DEG C is optimized, the charging energy complementing efficiency is improved, and the low-temperature charging problem when the Tmin is below-20 DEG C can be solved.

The application discloses a driving circuit and a method thereof of a display panel, the display panel and a display device, and relates to the technical field of display. The circuit comprises a picture detection module, the picture detection module is arranged to detect a picture scene type of an input picture, and determine a picture detection signal according to the picture scene type; a compensation trigger module, a signal trigger end of the compensation trigger module is electrically connected with a first signal interface of the picture detection module, the compensation trigger module is arranged to receive the picture detection signal sent by the picture detection module, and trigger a level signal of a heavy load picture according to the picture detection signal, and generate a clock signal; and a charging compensation module, a signal input end of the charging compensation module is electrically connected with a signal output end of the compensation trigger module, the charging compensation module is arranged to perform charging compensation according to the clock signal sent by the compensation trigger module. The application aims to improve the surface uniformity of a super-large size screen picture display.

The application discloses a pixel circuit, a driving method thereof and a display panel. The pixel circuit comprises a light-emitting module, a driving module, a coupling module, a second voltage transmission unit and a voltage interval unit. The second voltage transmission unit is connected between a first power supply and a first end of the driving module, and is used for transmitting a voltage of the first power supply to the first end of the driving module in a compensation stage. A first end of the coupling module is connected with a control end of the driving module. The voltage interval unit is connected between a second end of the driving module and a second end of the coupling module, and is used for being turned on in the compensation stage, so that the first power supply charges the coupling module, and a threshold voltage of the driving module is written to the second end of the coupling module. Through the charging compensation mode, the dispersion of the threshold voltage of the driving module is compensated, the compensation of the positive or negative bias of the threshold voltage is realized, the display uniformity is improved, and the display effect is improved.

The application discloses a displacement detection circuit and piezoelectric circuit of a piezoelectric actuator. The piezoelectric actuator is used to generate haptic feedback according to a received haptic voltage signal under external force application. The displacement detection circuit comprises a charge storage element for detecting a first charge generated by the piezoelectric actuator due to deformation; a compensation circuit for performing multiple charging operations or discharging operations on the charge storage element to provide a second charge opposite to the first charge to the charge storage element; a counting circuit for counting the number of charging operations or discharging operations of the compensation circuit to obtain a counting value; and a logic output circuit for calculating the total amount of the second charge provided by the compensation circuit according to the counting value, and obtaining the real-time displacement amount of the piezoelectric actuator according to the total amount of the charge, so that the displacement amount of the piezoelectric element in the haptic feedback process can be detected without setting a sensor, and the circuit is simplified, the cost is reduced, the product performance is improved, and the power consumption is reduced.