CN105810146A - Shadow eliminating circuit and control method thereof, line drive circuit and display screen - Google Patents
Shadow eliminating circuit and control method thereof, line drive circuit and display screen Download PDFInfo
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- CN105810146A CN105810146A CN201610324382.2A CN201610324382A CN105810146A CN 105810146 A CN105810146 A CN 105810146A CN 201610324382 A CN201610324382 A CN 201610324382A CN 105810146 A CN105810146 A CN 105810146A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a shadow eliminating circuit and a control method thereof, a line drive circuit and a display screen, wherein the shadow eliminating circuit comprises a monitoring circuit and an executing circuit; the monitoring circuit is used for receiving a shutdown signal and for generating an executing signal, wherein the shutdown signal is used for representing that the line drive circuit of the display screen is disconnected; the executing circuit is connected to the output ends of the monitoring circuit and the line drive circuit, and the executing circuit is used for receiving the executing signal and for executing a potential pulling-down operation, wherein by virtue of the potential pulling-down operation, the potential of the output end of the line drive circuit is pulled down. The shadow eliminating circuit disclosed by the invention can solve the technical problems in the prior art that a pull-down circuit is poor in pull-down precision and high in debugging cost.
Description
Technical field
The present invention relates to display screen field, disappear shadow circuit and control method thereof, horizontal drive circuit and display screen in particular to one.
Background technology
Fig. 1 is the structural representation of a kind of display screen according to prior art, as shown in Figure 1, LED display driving chip is broadly divided into line driving chip (PMOS, P-channel field-effect transistor (PEFT) transistor) and row driving chip (constant-current source), C1～C4 is the parasitic capacitance on corresponding line, LED display (can also be called scan screen) when display for show line by line, and its job order can be:
1, the first row is connected by the internal PMOS of LED line driving chip with power supply (VDD), opens the first row output, and the voltage V_row1 of the first row is high level, i.e. V_row1=VDD, and other row of LED line driving chip is output as high-impedance state.
2, LED array driving chip (constant-current source) opens the constant-current source of respective channel according to the data of the first row, lights the first row LED.
3, LED array driving chip (constant-current source) closes all output channels, closes the first row LED, now the voltage V_col1～V_col4=VDD-V_led on all alignments, and wherein V_led is the cut-in voltage of LED.
4, LED line driving chip closes the first row output, and the first row is output as high-impedance state, because the impact of parasitic capacitance C1, now the voltage V_row1 in the first row is maintained as high level, i.e. V_row1=VDD.
5, the second row is connected by the internal PMOS of LED line driving chip with power supply (VDD), opens the second row output, the voltage V_row2=VDD on the second row.
6, LED array driving chip (constant-current source) opens the constant-current source of respective channel according to the data of the second row, light the second row LED, because the impact of parasitic capacitance C1, voltage V_row1=VDD in the first row, so when constant-current source is just opened, the LED of the first row also can be lighted simultaneously, because LED line driving chip the first row is output as high-impedance state, so the time that the first row LED is lit can be shorter, the lantern festival that display phenomenon is the first row is secretly bright (brightness is dark).
7, switching display next line, repeats the 3rd step～the 6th step, and every time when display current line, the LED of a upper display line can be secretly bright.
Because LED display usually progressively scans from top to bottom, so the lastrow that display effect is the row lighted has secretly bright, claiming this phenomenon in industry is upper ghost, or is row ghost.
In order to eliminate the upper ghost phenomenon of LED display, the multiple upper ghost circuit that disappears is devised in industry, basic skills is for increasing pull-down circuit, namely complete at every display line, time closing rows drives (PMOS), by drop-down for the current potential of this journey, the current potential on this journey is made to reduce, so when the LED of display next line, the LED of this journey will not be lit.
Existing technical scheme in the market, mainly metal-oxide-semiconductor pull-down scheme, be adjust fall times according to program to control drop-down current potential.Owing to the display unit plate on market is of a great variety, fall times constants on every kind of display unit plate is very big, need every kind of independent debugging routine of display unit plate, and same cell board causes because the parasitic capacitance in each row is not of uniform size, the conducting resistance of drop-down metal-oxide-semiconductor is also inconsistent, so being difficult to allow the drop-down current potential of each row consistent.Therefore the drop-down precision of existing scheme is poor and debugging cost high.
For the problem that the drop-down low precision of pull-down circuit of the prior art and debugging cost are high, effective solution is not yet proposed at present.
Summary of the invention
Embodiments provide one to disappear shadow circuit and control method thereof, horizontal drive circuit and display screen, at least to solve the drop-down low precision of pull-down circuit of the prior art and the technical problem that debugging cost is high.
An aspect according to embodiments of the present invention, it is provided that one disappears shadow circuit, including: observation circuit, it is used for receiving shutdown signal, and generates execution signal, wherein, shutdown signal disconnects for the horizontal drive circuit characterizing display screen；Performing circuit, be connected with the outfan of observation circuit and horizontal drive circuit, be used for receiving execution signal, and perform drop-down potential operations, wherein, drop-down potential operations is for the current potential of the outfan of drop-down horizontal drive circuit.
Another aspect according to embodiments of the present invention, additionally provides the control method of a kind of shadow circuit that disappears, including: after the horizontal drive circuit of display screen disconnects, observation circuit receives shutdown signal, and wherein, shutdown signal is used for characterizing horizontal drive circuit and disconnects；Observation circuit generates and performs signal, and execution signal is sent to execution circuit；Performing circuit after receiving execution signal, perform drop-down potential operations, wherein, drop-down potential operations is for the current potential of the outfan of drop-down horizontal drive circuit.
Another aspect according to embodiments of the present invention, additionally provides a kind of horizontal drive circuit, including: transistor, drain electrode is connected with power supply, and source electrode accesses the outfan of horizontal drive circuit；Observation circuit, is used for receiving shutdown signal, and generates execution signal, and wherein, shutdown signal is used for characterizing horizontal drive circuit and disconnects；Performing circuit, be connected with the source electrode of observation circuit and transistor, be used for receiving execution signal, and perform drop-down potential operations, wherein, drop-down potential operations is for the current potential of the outfan of drop-down horizontal drive circuit.
Another aspect according to embodiments of the present invention, additionally provides a kind of display screen, including: the horizontal drive circuit of any one in the above embodiment of the present invention.
In embodiments of the present invention, observation circuit can be passed through and receive the shutdown signal that horizontal drive circuit disconnects, and generate execution signal be sent to execution circuit, perform circuit according to the execution signal received, perform drop-down potential operations, thus realizing the purpose of the current potential of the outfan of drop-down horizontal drive circuit, and perform circuit and perform drop-down potential operations, drop-down current potential is controlled, thus solving drop-down low precision and the debugging cost high-tech problem of pull-down circuit of the prior art without adjusting fall times by program.Therefore, by scheme provided by the invention, it is possible to by observation circuit and the execution drop-down potential operations of circuit realiration, eliminate the upper ghost phenomenon of display screen, improve drop-down current potential precision, it is achieved automatically control, reduce the effect of debugging cost.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of display screen according to prior art；
Fig. 2 is the schematic diagram of a kind of shadow circuit that disappears according to embodiments of the present invention；
Fig. 3 is the structural representation of a kind of shadow circuit that optionally disappears according to embodiments of the present invention；
Fig. 4 is the flow chart of the control method of a kind of shadow circuit that disappears according to embodiments of the present invention；And
Fig. 5 is the schematic diagram of a kind of horizontal drive circuit according to embodiments of the present invention.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a present invention part, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, all should belong to the scope of protection of the invention.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, " second " etc. are for distinguishing similar object, without being used for describing specific order or precedence.Should be appreciated that the data of so use can be exchanged in the appropriate case, in order to embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " includes " and " having " and their any deformation, it is intended to cover non-exclusive comprising, such as, contain series of steps or the process of unit, method, system, product or equipment be not necessarily limited to those steps or the unit clearly listed, but can include clearly not listing or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiment 1
According to embodiments of the present invention, it is provided that one disappears shadow circuit embodiments, and Fig. 2 is the schematic diagram of a kind of shadow circuit that disappears according to embodiments of the present invention, as in figure 2 it is shown, this disappears, shadow circuit includes:
Observation circuit 22, is used for receiving shutdown signal, and generates execution signal, and wherein, shutdown signal disconnects for the horizontal drive circuit 26 characterizing display screen.
Concrete, above-mentioned horizontal drive circuit can be line driving chip, is not limited only to this, and the circuit that other discrete components with driving function are combined into can also realize such scheme.Above-mentioned shutdown signal can be sent by the chip system of line driving chip.
Performing circuit 24, be connected with the outfan of observation circuit 22 and horizontal drive circuit, be used for receiving execution signal, and perform drop-down potential operations, wherein, drop-down potential operations is for the current potential of the outfan of drop-down horizontal drive circuit.
In the optional scheme of one, after the line driving chip of display screen is closed, chip system can send shutdown signal to observation circuit, observation circuit is after receiving this shutdown signal, execution signal can be generated, and this execution signal is sent to execution circuit, perform circuit after receiving execution signal, the current potential of the outfan of drop-down line driving chip can be started, the current potential of this row is reduced, the LED of this journey makes the voltage cut-in voltage less than this row LED of this row, thus when the LED of display next line, will not be lit.
Fig. 3 is the structural representation of a kind of shadow circuit that optionally disappears according to embodiments of the present invention, as shown in Figure 3, the shadow circuit that disappears can include drop-down observation circuit (namely above-mentioned observation circuit) and pull-down circuit (namely above-mentioned execution circuit), and the PD end of pull-down circuit and drop-down observation circuit and the OUT terminal of line driving chip connect.After line driving chip is closed, chip system opens DN signal, makes DN=1, drop-down observation circuit, after receiving DN signal, makes PD=0, and PD signal is sent to pull-down circuit, pull-down circuit, after receiving PD signal, is started working, drop-down OUT terminal current potential.
Pass through the above embodiment of the present invention, observation circuit can be passed through and receive the shutdown signal that horizontal drive circuit disconnects, and generate execution signal be sent to execution circuit, perform circuit according to the execution signal received, perform drop-down potential operations, thus realizing the purpose of the current potential of the outfan of drop-down horizontal drive circuit, and perform circuit and perform drop-down potential operations, drop-down current potential is controlled, thus solving drop-down low precision and the debugging cost high-tech problem of pull-down circuit of the prior art without adjusting fall times by program.Therefore, by scheme provided by the invention, it is possible to by observation circuit and the execution drop-down potential operations of circuit realiration, eliminate the upper ghost phenomenon of display screen, improve drop-down current potential precision, it is achieved automatically control, reduce the effect of debugging cost.
Optionally, in the above embodiment of the present invention, above-mentioned execution circuit includes:
Amplifier, positive input is connected with the outfan of horizontal drive circuit, and reverse input end accesses drop-down reference potential, controls end and is connected with the first end of observation circuit, for comparing the current potential of the outfan of horizontal drive circuit and drop-down reference potential, obtains potential difference.
Concrete, above-mentioned drop-down reference potential can be provided by the chip system of line driving chip, can be set according to the cut-in voltage of each row LED in display screen, time in order to ensure display next line LED, this row LED will not be lit, the drop-down reference potential cut-in voltage less than this row LED can be set, for instance could be arranged to 1.2V, 2.5V or 3.5V.
The first transistor, grid is connected with the outfan of amplifier, and drain electrode is connected with the outfan of horizontal drive circuit, source ground, for turning on when potential difference is be more than or equal to preset potential difference.
Concrete, above-mentioned the first transistor can be N-channel field-effect transistor, i.e. NMOS tube, and above-mentioned preset potential difference can be the electric conduction potential difference of the first NMOS tube, i.e. potential difference between NMOS tube grid and source electrode.
In the optional scheme of one, when the line driving chip of display screen is closed, chip system can send shutdown signal to observation circuit, observation circuit is after receiving this shutdown signal, execution signal can be generated, and this execution signal is sent to amplifier, amplifier is after receiving execution signal, start working, the current potential of the outfan of line driving chip and drop-down reference potential are compared, obtain potential difference, and it is sent to the first transistor, when the potential difference that amplifier exports is be more than or equal to the electric conduction potential difference of the first NMOS tube, the first transistor turns on, the output head grounding of line driving chip, the current potential of outfan is by quick pull-down.
As shown in Figure 3, pull-down circuit can include amplifier amp and NMOS tube NM0, the positive input of amp can be connected with the OUT terminal of the PD end of drop-down observation circuit and line driving chip, the current potential of the reverse input end that current potential is VFB, amp that reverse input end can access the positive input of VR_pulldn, amp is VR_pulldn, the current potential of the outfan of amp is VG, the grid of NM0 is connected with the outfan of amp, and drain electrode is connected with the OUT terminal of line driving chip, source ground.As PD=0, amp starts working, VFB=VDD, and VR_pulldn < VDD, so the VG of amp output is high potential, NM0 turns on, and starts drop-down OUT terminal current potential.
By such scheme, being compared the current potential of the outfan of horizontal drive circuit and drop-down reference potential by amplifier, controlling the first transistor conducting, thus realizing the purpose of the current potential of the outfan of drop-down horizontal drive circuit.The first transistor is controlled, it is possible to improve the precision that circuit is drop-down by amplifier.
Optionally, in the above embodiment of the present invention, the second end of observation circuit is connected with the outfan of amplifier, for when potential difference is less than or equal to preset stopping potential value, generating stop signal, stop signal is used for controlling to perform circuit and stops performing drop-down potential operations.
Concrete, above-mentioned preset stopping potential value may be such that first NMOS tube potential value close to shutoff.
In the optional scheme of one, after the first NMOS tube conducting, the current potential of the outfan of line driving chip can reduce, and moves closer to drop-down reference potential, thus potential difference reduces, the potential difference of monitoring circuit monitors amplifier output, when potential difference makes the first NMOS tube almost close, it is determined that complete drop-down current potential, generate stop signal, stop performing circuit work so that perform circuit and stop performing drop-down potential operations.
As it is shown on figure 3, drop-down observation circuit can also be connected with the outfan of amp.After opening NM0, the current potential that the current potential of VFB becomes closer to VR_pulldn, VG is more and more lower, when VG makes NM0 almost close time, i.e. OUT=VFB=VR_pulldn, complete drop-down, and by the current potential of drop-down monitoring circuit monitors VG, in time completing drop-down, generate stop signal, make PD=1, close amp and NM0, stop performing drop-down potential operations.
By such scheme, the potential difference that observation circuit is exported by monitor AMP, it is determined that fall times, it is not necessary to adjust fall times by program, thus improving drop-down precision, reduce debugging cost.
Optionally, in the above embodiment of the present invention, above-mentioned execution circuit also includes: transistor seconds, grid is connected with the first end of observation circuit, and drain electrode is connected with the grid of the first transistor, source ground, for receiving described stop signal, and generate cut-off signals, wherein, cut-off signals is used for controlling the first transistor and turns off.
Concrete, above-mentioned transistor seconds can be N-channel field-effect transistor, i.e. NMOS tube.
In the optional scheme of one, second NMOS tube is after receiving stop signal, the electric conduction potential difference of stop signal Yu the second NMOS tube is compared, if stop signal is be more than or equal to the electric conduction potential difference of the second NMOS tube, then the second NMOS tube conducting, generates cut-off signals, reduces the first NMOS tube drain potential, first NMOS tube is turned off, completes the current potential of the outfan of drop-down line driving chip.
As it is shown on figure 3, transistor seconds can be NM1, drain electrode is connected with the source electrode of NM0 and the outfan of amp, and grid is connected with the PD end of drop-down observation circuit, source ground.NM1 can carry out turning on or turning off according to the PD signal of drop-down observation circuit, and when drop-down observation circuit exports PD=0, NM1 turns off；When drop-down observation circuit exports PD=1, NM1 turns on so that NM0 turns off, thus providing cut-off signals for NM0.
Herein it should be noted that other modes can also be adopted to generate cut-off signals, thus turning off the first transistor, this is not done further restriction by the present invention.
Optionally, in the above embodiment of the present invention, above-mentioned execution circuit also includes: protection circuit, is connected between the outfan of horizontal drive circuit and the drain electrode of the first transistor, and is connected with the positive input of amplifier, for current limliting.
In the optional scheme of one, protection circuit is arranged between the outfan of line driving chip and the first NMOS tube, it is possible to plays the effect of drop-down current limliting, it is to avoid pull-down current is excessive, causes that circuit components damages, and affects the normal operation of the shadow circuit that disappears.Feedback Feedback point can also be set, coordinate amplifier to adjust drop-down waveform, improve drop-down precision.
Optionally, in the above embodiment of the present invention, above-mentioned protection circuit includes: the node that connects of the first resistance and the second resistance, the first resistance and the second resistant series, the first resistance and the second resistance is connected with the positive input of amplifier.
Concrete, it is possible to the actual demand according to current limliting and feedback point, select the first resistance and second resistance of corresponding resistance.
As it is shown on figure 3, the first resistance can be the R1 in Fig. 3, the second resistance can be that R0, R1 and the R0 in Fig. 3 is connected between the OUT terminal of line driving chip and the drain electrode of NM0, and the node that connects of R1 and R0 is connected with the positive input of amplifier.
Pass through such scheme, when the shadow circuit that disappears provided by the present invention works, only include pull-down circuit, it is absent from stability problem, drop-down precision can be improved by amplifier, and under only small area and power consumption, significantly high loop bandwidth can be designed, improve drop-down speed, thus realizing the current potential of the outfan of high accuracy quick pull-down horizontal drive circuit.
Embodiment 2
According to embodiments of the present invention, provide the control method embodiment of a kind of shadow circuit that disappears, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although illustrate logical order in flow charts, but in some cases, it is possible to perform shown or described step with the order being different from herein.
Fig. 4 is the flow chart of the control method of a kind of shadow circuit that disappears according to embodiments of the present invention, and as shown in Figure 4, the method comprises the steps:
Step S42, after the horizontal drive circuit of display screen disconnects, observation circuit receives shutdown signal, and wherein, shutdown signal is used for characterizing horizontal drive circuit and disconnects.
Concrete, above-mentioned horizontal drive circuit can be line driving chip, is not limited only to this, and the circuit that other discrete components with driving function are combined into can also realize such scheme.Above-mentioned shutdown signal can be sent by the chip system of line driving chip.
Step S44, observation circuit generates and performs signal, and execution signal is sent to execution circuit.
Step S46, after performing circuit and receiving execution signal, performs drop-down potential operations, and wherein, drop-down potential operations is for the current potential of the outfan of drop-down horizontal drive circuit.
In the optional scheme of one, after the line driving chip of display screen is closed, chip system can send shutdown signal to observation circuit, observation circuit is after receiving this shutdown signal, execution signal can be generated, and this execution signal is sent to execution circuit, perform circuit after receiving execution signal, the current potential of the outfan of drop-down line driving chip can be started, the current potential of this row is reduced, the LED of this journey makes the voltage cut-in voltage less than this row LED of this row, thus when the LED of display next line, will not be lit.
Pass through the above embodiment of the present invention, observation circuit can be passed through and receive the shutdown signal that horizontal drive circuit disconnects, and generate execution signal be sent to execution circuit, perform circuit according to the execution signal received, perform drop-down potential operations, thus realizing the purpose of the current potential of the outfan of drop-down horizontal drive circuit, and perform circuit and perform drop-down potential operations, drop-down current potential is controlled, thus solving drop-down low precision and the debugging cost high-tech problem of pull-down circuit of the prior art without adjusting fall times by program.Therefore, by scheme provided by the invention, it is possible to by observation circuit and the execution drop-down potential operations of circuit realiration, eliminate the upper ghost phenomenon of display screen, improve drop-down current potential precision, it is achieved automatically control, reduce the effect of debugging cost.
Optionally, in the above embodiment of the present invention, step S46, perform circuit after receiving execution signal, perform drop-down potential operations and include:
Step S462, performs the amplifier in circuit and obtains drop-down reference potential.
Concrete, above-mentioned drop-down reference potential can be provided by the chip system of line driving chip, can be set according to the cut-in voltage of each row LED in display screen, time in order to ensure display next line LED, this row LED will not be lit, the drop-down reference potential cut-in voltage less than this row LED can be set, for instance could be arranged to 1.2V, 2.5V or 3.5V.
Step S464, current potential and the drop-down reference potential of the outfan of horizontal drive circuit are compared by amplifier, obtain potential difference, and potential difference is sent to the first transistor.
Step S466, the first transistor judges that whether potential difference is be more than or equal to preset potential difference.
Concrete, above-mentioned the first transistor can be N-channel field-effect transistor, i.e. NMOS tube, and above-mentioned preset potential difference can be the electric conduction potential difference of the first NMOS tube, i.e. potential difference between NMOS tube grid and source electrode.
Step S468, when potential difference is be more than or equal to preset potential difference, the first transistor is opened, to perform drop-down potential operations.
In the optional scheme of one, when the line driving chip of display screen is closed, chip system can send shutdown signal to observation circuit, observation circuit is after receiving this shutdown signal, execution signal can be generated, and this execution signal is sent to amplifier, amplifier is after receiving execution signal, start working, the current potential of the outfan of line driving chip and drop-down reference potential are compared, obtain potential difference, and it is sent to the first transistor, when the potential difference that amplifier exports is be more than or equal to the electric conduction potential difference of the first NMOS tube, the first transistor turns on, the output head grounding of line driving chip, the current potential of outfan is by quick pull-down.
By such scheme, being compared the current potential of the outfan of horizontal drive circuit and drop-down reference potential by amplifier, controlling the first transistor conducting, thus realizing the purpose of the current potential of the outfan of drop-down horizontal drive circuit.The first transistor is controlled, it is possible to improve the precision that circuit is drop-down by amplifier.
Optionally, in the above embodiment of the present invention, in step S464, current potential and the drop-down reference potential of the outfan of horizontal drive circuit are compared by amplifier, and after obtaining potential difference, said method also includes:
Step S482, potential difference is sent to observation circuit by amplifier.
Step S484, observation circuit judges that whether potential difference is less than or equal to preset stopping potential value.
Concrete, above-mentioned preset stopping potential value may be such that first NMOS tube potential value close to shutoff.
Step S486, when potential difference is less than or equal to preset stopping potential value, observation circuit generates stop signal, and stop signal is sent to execution circuit.
Step S488, performs circuit after receiving stop signal, stops performing drop-down potential operations.
In the optional scheme of one, after the first NMOS tube conducting, the current potential of the outfan of line driving chip can reduce, and moves closer to drop-down reference potential, thus potential difference reduces, the potential difference of monitoring circuit monitors amplifier output, when potential difference makes the first NMOS tube almost close, it is determined that complete drop-down current potential, generate stop signal, stop performing circuit work so that perform circuit and stop performing drop-down potential operations.
By such scheme, the potential difference that observation circuit is exported by monitor AMP, it is determined that fall times, it is not necessary to adjust fall times by program, thus improving drop-down precision, reduce debugging cost.
Optionally, in the above embodiment of the present invention, step S488, perform circuit after receiving stop signal, stop performing drop-down potential operations and include:
Step S4882, amplifier quits work.
Step S4884, performs the transistor seconds in circuit and turns off, and controls the first transistor shutoff.
Concrete, above-mentioned transistor seconds can be N-channel field-effect transistor, i.e. NMOS tube.
In the optional scheme of one, amplifier, after receiving stop signal, quits work；Second NMOS tube is after receiving stop signal, the electric conduction potential difference of stop signal Yu the second NMOS tube is compared, if stop signal is be more than or equal to the electric conduction potential difference of the second NMOS tube, then the second NMOS tube conducting, generate cut-off signals, reduce the first NMOS tube drain potential so that the first NMOS tube turns off, and completes the current potential of the outfan of drop-down line driving chip.
Herein it should be noted that other modes can also be adopted to generate cut-off signals, thus turning off the first transistor, this is not done further restriction by the present invention.
Embodiment 3
According to embodiments of the present invention, additionally providing a kind of horizontal drive circuit embodiment, Fig. 5 is the schematic diagram of a kind of horizontal drive circuit according to embodiments of the present invention, as it is shown in figure 5, this horizontal drive circuit includes:
Transistor 52, drain electrode is connected with power supply, and source electrode accesses the outfan of horizontal drive circuit.
Concrete, above-mentioned horizontal drive circuit can be line driving chip, is not limited only to this, and the circuit that other discrete components with driving function are combined into can also realize such scheme.Above-mentioned transistor can be P-channel field-effect transistor (PEFT) transistor, i.e. PMOS.Above-mentioned power supply can be DC source VDD.
Observation circuit 22, is used for receiving shutdown signal, and generates execution signal, and wherein, shutdown signal is used for characterizing horizontal drive circuit and disconnects.
Concrete, above-mentioned shutdown signal can be sent by the chip system of line driving chip.
Performing circuit 24, be connected with the source electrode of observation circuit 22 and transistor 52, be used for receiving execution signal, and perform drop-down potential operations, wherein, drop-down potential operations is for the current potential of the outfan of drop-down horizontal drive circuit.
In the optional scheme of one, after the line driving chip of display screen is closed, chip system can send shutdown signal to observation circuit, observation circuit is after receiving this shutdown signal, execution signal can be generated, and this execution signal is sent to execution circuit, perform circuit after receiving execution signal, the current potential of the outfan of drop-down line driving chip can be started, the current potential of this row is reduced, the LED of this journey makes the voltage cut-in voltage less than this row LED of this row, thus when the LED of display next line, will not be lit.
As shown in Figure 3, the line driving chip of display screen can include PMOS PM0, drop-down observation circuit (namely above-mentioned observation circuit) and pull-down circuit (namely above-mentioned execution circuit), the drain electrode of PMOS connects DC source VDD, the source electrode of PMOS connects OUT terminal, OUT terminal can connect parasitic capacitance CL over the ground, and the PD end of pull-down circuit and drop-down observation circuit and the OUT terminal of line driving chip connect.Close at line driving chip, namely after the PM0 in line driving chip closes, chip system opens DN signal, making DN=1, drop-down observation circuit, after receiving DN signal, makes PD=0, and PD signal is sent to pull-down circuit, pull-down circuit, after receiving PD signal, is started working, drop-down OUT terminal current potential.
Pass through the above embodiment of the present invention, observation circuit can be passed through and receive the shutdown signal that horizontal drive circuit disconnects, and generate execution signal be sent to execution circuit, perform circuit according to the execution signal received, perform drop-down potential operations, thus realizing the purpose of the current potential of the outfan of drop-down horizontal drive circuit, and perform circuit and perform drop-down potential operations, drop-down current potential is controlled, thus solving drop-down low precision and the debugging cost high-tech problem of pull-down circuit of the prior art without adjusting fall times by program.Therefore, by scheme provided by the invention, it is possible to by observation circuit and the execution drop-down potential operations of circuit realiration, eliminate the upper ghost phenomenon of display screen, improve drop-down current potential precision, it is achieved automatically control, reduce the effect of debugging cost.
Optionally, in the above embodiment of the present invention, above-mentioned execution circuit includes:
Amplifier, positive input is connected with the source electrode of transistor, and reverse input end accesses drop-down reference potential, controls end and is connected with the first end of observation circuit, for comparing the current potential of the outfan of horizontal drive circuit and drop-down reference potential, obtains potential difference.
Concrete, above-mentioned drop-down reference potential can be provided by the chip system of line driving chip, can be set according to the cut-in voltage of each row LED in display screen, time in order to ensure display next line LED, this row LED will not be lit, the drop-down reference potential cut-in voltage less than this row LED can be set, for instance could be arranged to 1.2V, 2.5V or 3.5V.
The first transistor, grid is connected with the outfan of amplifier, and drain electrode is connected with the source electrode of transistor, source ground, for turning on when potential difference is be more than or equal to preset potential difference.
Concrete, above-mentioned the first transistor can be N-channel field-effect transistor, i.e. NMOS tube, and above-mentioned preset potential difference can be the electric conduction potential difference of the first NMOS tube, i.e. potential difference between NMOS tube grid and source electrode.
In the optional scheme of one, when the line driving chip of display screen is closed, chip system can send shutdown signal to observation circuit, observation circuit is after receiving this shutdown signal, execution signal can be generated, and this execution signal is sent to amplifier, amplifier is after receiving execution signal, start working, the current potential of the outfan of line driving chip and drop-down reference potential are compared, obtain potential difference, and it is sent to the first transistor, when the potential difference that amplifier exports is be more than or equal to the electric conduction potential difference of the first NMOS tube, the first transistor turns on, the output head grounding of line driving chip, the current potential of outfan is by quick pull-down.
As shown in Figure 3, pull-down circuit can include amplifier amp and NMOS tube NM0, the positive input of amp can be connected with the source electrode of the PD end of drop-down observation circuit and PM0, the current potential of the reverse input end that current potential is VFB, amp that reverse input end can access the positive input of VR_pulldn, amp is VR_pulldn, the current potential of the outfan of amp is VG, the grid of NM0 is connected with the outfan of amp, and drain electrode is connected with the source electrode of PM0, source ground.As PD=0, amp starts working, VFB=VDD, and VR_pulldn < VDD, so the VG of amp output is high potential, NM0 turns on, and starts drop-down OUT terminal current potential.
By such scheme, being compared the current potential of the outfan of horizontal drive circuit and drop-down reference potential by amplifier, controlling the first transistor conducting, thus realizing the purpose of the current potential of the outfan of drop-down horizontal drive circuit.The first transistor is controlled, it is possible to improve the precision that circuit is drop-down by amplifier.
It should be noted that herein, in the horizontal drive circuit of actual displayed screen, comprising multiple transistor, the source electrode of each transistor connects the outfan of corresponding row, in order to realize the purpose of the current potential of the drop-down outfan of each row, it is possible to corresponding each transistor arranges the shadow circuit that disappears.
Embodiment 4
According to embodiments of the present invention, a kind of display screen embodiment is additionally provided, including any one horizontal drive circuit in above-described embodiment.
Concrete, above-mentioned horizontal drive circuit can be line driving chip, is not limited only to this, and the circuit that other discrete components with driving function are combined into can also realize such scheme.Above-mentioned display screen can be LED display, but is not limited only to this.
Pass through the above embodiment of the present invention, observation circuit can be passed through and receive the shutdown signal that horizontal drive circuit disconnects, and generate execution signal be sent to execution circuit, perform circuit according to the execution signal received, perform drop-down potential operations, thus realizing the purpose of the current potential of the outfan of drop-down horizontal drive circuit, and perform circuit and perform drop-down potential operations, drop-down current potential is controlled, thus solving drop-down low precision and the debugging cost high-tech problem of pull-down circuit of the prior art without adjusting fall times by program.Therefore, by scheme provided by the invention, it is possible to by observation circuit and the execution drop-down potential operations of circuit realiration, eliminate the upper ghost phenomenon of display screen, improve drop-down current potential precision, it is achieved automatically control, reduce the effect of debugging cost.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, certain embodiment there is no the part described in detail, it is possible to referring to the associated description of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents, can realize by another way.Wherein, device embodiment described above is merely schematic, the such as division of described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be through INDIRECT COUPLING or the communication connection of some interfaces, unit or module, it is possible to be electrical or other form.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, namely may be located at a place, or can also be distributed on multiple unit.Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, it would however also be possible to employ the form of SFU software functional unit realizes.
If described integrated unit is using the form realization of SFU software functional unit and as independent production marketing or use, it is possible to be stored in a computer read/write memory medium.Based on such understanding, part or all or part of of this technical scheme that prior art is contributed by technical scheme substantially in other words can embody with the form of software product, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can for personal computer, server or the network equipment etc.) performs all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium includes: USB flash disk, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (13)
1. the shadow circuit that disappears, it is characterised in that including:
Observation circuit, is used for receiving shutdown signal, and generates execution signal, and wherein, described shutdown signal disconnects for the horizontal drive circuit characterizing display screen；
Performing circuit, be connected with the outfan of described observation circuit and described horizontal drive circuit, be used for receiving described execution signal, and perform drop-down potential operations, wherein, described drop-down potential operations is for the current potential of the outfan of drop-down described horizontal drive circuit.
2. circuit according to claim 1, it is characterised in that described execution circuit includes:
Amplifier, positive input is connected with the outfan of described horizontal drive circuit, and reverse input end accesses drop-down reference potential, controls end and is connected with the first end of described observation circuit, for current potential and the described drop-down reference potential of the relatively outfan of described horizontal drive circuit, obtain potential difference；
The first transistor, grid is connected with the outfan of described amplifier, and drain electrode is connected with the outfan of described horizontal drive circuit, source ground, for turning on when described potential difference is be more than or equal to preset potential difference.
3. circuit according to claim 2, it is characterized in that, second end of described observation circuit is connected with the outfan of described amplifier, for when described potential difference is less than or equal to preset stopping potential value, generate stop signal, wherein, described stop signal is used for controlling described execution circuit and stops the described drop-down potential operations of execution.
4. circuit according to claim 3, it is characterized in that, described execution circuit also includes: transistor seconds, grid is connected with the first end of described observation circuit, and drain electrode is connected with the grid of described the first transistor, source ground, for receiving described stop signal, and generate cut-off signals, wherein, described cut-off signals is used for controlling described the first transistor and turns off.
5. circuit according to claim 2; it is characterized in that, described execution circuit also includes: protection circuit, is connected between the outfan of described horizontal drive circuit and the drain electrode of described the first transistor; and be connected with the positive input of described amplifier, for current limliting.
6. circuit according to claim 5; it is characterized in that; described protection circuit includes: the first resistance and the second resistance, and the node that connects of described first resistance and described second resistant series, described first resistance and described second resistance is connected with the positive input of described amplifier.
7. the control method of the shadow circuit that disappears, it is characterised in that including:
After the horizontal drive circuit of display screen disconnects, observation circuit receives shutdown signal, and wherein, described shutdown signal is used for characterizing described horizontal drive circuit and disconnects；
Described observation circuit generates and performs signal, and described execution signal is sent to execution circuit；
After described execution circuit receives described execution signal, performing drop-down potential operations, wherein, described drop-down potential operations is for the current potential of the outfan of drop-down described horizontal drive circuit.
8. method according to claim 7, it is characterised in that after described execution circuit receives described execution signal, performs drop-down potential operations and includes:
Amplifier in described execution circuit obtains drop-down reference potential；
Current potential and the described drop-down reference potential of the outfan of described horizontal drive circuit are compared by described amplifier, obtain potential difference, and described potential difference is sent to the first transistor；
Described the first transistor judges that whether described potential difference is be more than or equal to preset potential difference；
When described potential difference is be more than or equal to described preset potential difference, described the first transistor turns on, to perform described drop-down potential operations.
9. method according to claim 8, it is characterised in that comparing at the described amplifier current potential by the outfan of described horizontal drive circuit and described drop-down reference potential, after obtaining potential difference, described method also includes:
Described potential difference is sent to described observation circuit by described amplifier；
Described observation circuit judges that whether described potential difference is less than or equal to preset stopping potential value；
When described potential difference is less than or equal to described preset stopping potential value, described observation circuit generates stop signal, and described stop signal is sent to execution circuit；
Described execution circuit, after receiving described stop signal, stops performing described drop-down potential operations.
10. method according to claim 9, it is characterised in that described execution circuit, after receiving described stop signal, stops performing described drop-down potential operations and includes:
Described amplifier quits work；
Transistor seconds in described execution circuit turns off, and controls the shutoff of described the first transistor.
11. a horizontal drive circuit, it is characterised in that including:
Transistor, drain electrode is connected with power supply, and source electrode accesses the outfan of horizontal drive circuit；
Observation circuit, is used for receiving shutdown signal, and generates execution signal, and wherein, described shutdown signal is used for characterizing described horizontal drive circuit and disconnects；
Performing circuit, be connected with the source electrode of described observation circuit and described transistor, be used for receiving described execution signal, and perform drop-down potential operations, wherein, described drop-down potential operations is for the current potential of the outfan of drop-down described horizontal drive circuit.
12. horizontal drive circuit according to claim 11, it is characterised in that described execution circuit includes:
Amplifier, positive input is connected with the source electrode of described transistor, and reverse input end accesses drop-down reference potential, controls end and is connected with the first end of described observation circuit, for current potential and the described drop-down reference potential of the relatively outfan of described horizontal drive circuit, obtain potential difference；
The first transistor, grid is connected with the outfan of described amplifier, and drain electrode is connected with the source electrode of described transistor, source ground, for turning on when described potential difference is be more than or equal to preset potential difference.
13. a display screen, it is characterised in that including: the horizontal drive circuit described in claim 11 or 12.
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| CN105810146B (en) | 2018-10-30 |
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