CN101390378B - Bias circuit and method for operating the same - Google Patents
Bias circuit and method for operating the same Download PDFInfo
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- CN101390378B CN101390378B CN2005800467304A CN200580046730A CN101390378B CN 101390378 B CN101390378 B CN 101390378B CN 2005800467304 A CN2005800467304 A CN 2005800467304A CN 200580046730 A CN200580046730 A CN 200580046730A CN 101390378 B CN101390378 B CN 101390378B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
- H04N3/185—Maintaining dc voltage constant
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
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Abstract
A bias circuit and a method for operating the same minimizes a picture distortion. The bias circuit includes a main capacitor and a plurality of sub capacitors for compensating picture distortion, a controller provides control signals having different duty cycles, and a plurality of switches receiving each of the switch control signals and changing each link (or path) between the main capacitor and the sub capacitors in accordance with the received switch control signals.
Description
Technical field
The present invention relates to a kind of display unit, more specifically, relate to a kind of method that is used for the biasing circuit of display unit and is used to operate described biasing circuit, described display unit for example is a cathode ray tube (CRT), and more preferably for example is ultra-thin display unit.
Background technology
The cathode ray tube (CRT) of display unit is to focusing on and quicken from R/G/B electron gun electrons emitted, these electronics by shadow mask (shadow mask) and the collision of R/G/B phosphor screen to form pixel.Electric current is flowed through the vertical horizontal deflection coils that reaches to produce two-dimensional screen.Yet the range difference between the range difference between electron gun and the CRT center Screen part and the corner portions located of electron gun and CRT screen can cause image fault.In other words, because the distance between the corner portions located of electron gun and CRT screen is relative longer, therefore grid (cross-hatch) width on the screen may be inconsistent, and the resolution (or definition) of corner screen part can be lower than the resolution (or definition) of center Screen part.
And because above-mentioned range difference, the corner portions located of screen can produce pin distortion (pindistortion).Along with the distance between electron gun and the CRT screen diminishes, above-mentioned image fault can be more serious.Therefore, for reducing the distance between electron gun and the CRT screen and produce ultra-thin display unit, also there are the many difficulties that comprise above-mentioned difficulties in especially ultra-thin CRT display unit.
Summary of the invention
One object of the present invention is to solve the problems referred to above and/or shortcoming at least, and advantage described below at least is provided.
An object of the present invention is to make image fault to minimize and/or prevent image fault.
Another purpose is to prevent pin distortion.Another object of the present invention is the range difference between compensate for electronic rifle and the display screen.
Another purpose of the present invention provides a kind of biasing circuit and method thereof that is used for ultra-thin CRT display unit.
In order to realize these purposes and other advantages and intention according to the invention, as what embody with general description here, biasing circuit comprises: main capacitor and a plurality of sub-capacitor, and it is used for the compensating images distortion; On-off controller, the switch controlling signal that its level of response synchronizing signal and output have different duty; And a plurality of switches, it receives each switch controlling signal and each links according to the switch controlling signal that receives changes between main capacitor and the sub-capacitor.
Sawtooth signal that on-off controller receives and horizontal-drive signal is synchronous and the parabolic signal synchronous with vertical synchronizing signal, wherein said on-off controller comprises a plurality of comparators, described comparator is exported each switch controlling signal according to the comparative result of two signals, here, each switch controlling signal has a different duty ratio.
Described on-off controller also comprises: transformer, the voltage swing of the described horizontal-drive signal of its conversion; And the sawtooth signal generator, it will be a sawtooth signal from the signal change of transformer output.
Described on-off controller also comprises a plurality of resistance of using direct current (DC) voltage, and for the parabolic signal that is applied to each comparator, each described direct voltage has a different voltage level.
When described switch was switched on, each switch in parallel connected corresponding sub-capacitor, and wherein, each switch is connected in parallel the sub-capacitor and the described main capacitor of connection parallel with one another.
In another aspect of the present invention, a kind of biasing circuit comprises: main capacitor, and it is used to compensate the distortion that occurs on the entire image; A plurality of sub-capacitors, it is used for compensating the distortion of the specific region that occurs in image; A plurality of comparators, it exports the switch controlling signal that each has different pulse durations according to the parabolic signal and the sawtooth signal that are applied with the direct voltage of different voltage levels; And a plurality of switches, it receives each switch controlling signal and changes each link between main capacitor and the sub-capacitor according to the switch controlling signal that receives.
Each comparator can be exported the switch controlling signal that each has different pulse durations according to the voltage level of the direct voltage that puts on parabolic signal.Here, when the voltage level of direct voltage was high, comparator can have the switch controlling signal that produces big pulse duration, and when the voltage level of direct voltage hanged down, comparator can produce the switch controlling signal with small-pulse effect width.
The sawtooth signal generator produces and the synchronous sawtooth waveforms of horizontal-drive signal.Photoelectrical coupler receives and the synchronous parabolic signal of vertical synchronizing signal; A plurality of resistors are applied to the parabolic signal that receives by photoelectrical coupler with direct voltage, and each direct voltage has different voltage levels.
When described switch was switched on, each switch in parallel connected corresponding sub-capacitor, and wherein, corresponding sub-capacitor and main capacitor that each switch will be connected in parallel mutually are connected in parallel.When described switch is turned off, the total capacitance value maximum of main capacitor and corresponding sub-capacitor.
Each comparator is exported the switch controlling signal that each has different pulse durations according to the voltage level that is applied to the direct voltage on the parabolic signal.When the voltage level of direct voltage was high, comparator produced the switch controlling signal with big pulse duration, and when the voltage level of direct voltage was low, the comparator generation had the switch controlling signal of small-pulse effect width.
In another aspect of the present invention, a kind of biasing circuit comprises: main capacitor, and it is used to compensate the distortion that occurs on the entire image; A plurality of sub-capacitors, it is used for compensating the distortion of the specific region that occurs in image; A plurality of comparators, it exports the switch controlling signal that each has different pulse durations according to first parabolic signal and second parabolic signal with direct voltage of different voltage levels synchronous with horizontal-drive signal; And a plurality of switch elements, it receives each switch controlling signal, and changes each link between main capacitor and the sub-capacitor according to the switch controlling signal that receives.
Switch element can comprise: first switch, and it is according to operating from the switch controlling signal of on-off controller output; Transformer, its control according to first switch comes output pulse signal; And second switch, it changes main capacitor and linking between the sub-capacitor accordingly according to the pulse signal from transformer output.
In another aspect of the present invention, a kind of method that is used to drive biasing circuit comprises: produce and the synchronous sawtooth signal of horizontal-drive signal; Produce the parabolic signal that each is applied with the direct voltage of different voltage levels; According to described sawtooth signal and parabolic signal, export the switch controlling signal that each has different pulse durations; And change between main capacitor and a plurality of sub-capacitors each link, described main capacitor compensates the distortion that occurs in the entire image, and described sub-capacitor compensates the distortion in the specific region that occurs in image.
Here, exporting each switch controlling signal with different pulse durations can comprise: according to the voltage level of the direct voltage that is applied to parabolic signal, export the switch controlling signal that each has different pulse durations.And each that changes between main capacitor and a plurality of sub-capacitors links and can comprise: when the switch controlling signal of being exported is in high level, corresponding sub-capacitor is connected in parallel, and sub-capacitor and the main capacitor that is connected in parallel is connected in parallel.
When the voltage level of described direct voltage when being high, the switch controlling signal that output has big pulse duration, and when the voltage level of described direct voltage when low, export switch controlling signal with small-pulse effect width.
Between described change main capacitor and a plurality of sub-capacitors each links and comprises: when the switch controlling signal of being exported is in low level, corresponding sub-capacitor is connected in series, and sub-capacitor and the main capacitor that is connected in series is connected in parallel.
Aspect another, a kind of method that is used to drive biasing circuit comprises of the present invention: produce and the first synchronous parabolic signal of horizontal-drive signal; Produce second parabolic signal of each direct voltage that is applied with different voltage levels; According to first and second parabolic signals, export the switch controlling signal that each has different pulse durations; And the total capacitance of adjusting main capacitor and a plurality of sub-capacitors according to described switch controlling signal, described main capacitor compensates the distortion that occurs in the entire image, and sub-capacitor compensates the distortion in the specific region that occurs in image.
Can realize the present invention in whole or in part by the method that drives biasing circuit, described method comprises: the level of response synchronizing signal also produces the switch controlling signal that each has a different duty; Switch controlling signal is sent to a plurality of switches; And according to the switch controlling signal that is sent changes between main capacitor and a plurality of sub-capacitors each links, they all are connected to each switch.
Described generation each switch controlling signal with a different duty is based on following and produces: produce and the synchronous sawtooth signal of horizontal-drive signal; Produce the parabolic signal that each is applied with the direct voltage of different voltage levels; And produce the switch controlling signal that each has a different duty according to described sawtooth signal and parabolic signal.
Between described change main capacitor and a plurality of sub-capacitors each links and comprises: when the switch controlling signal that is sent to described switch is in high level, corresponding sub-capacitor is connected in parallel, and sub-capacitor and the main capacitor that is connected in parallel is connected in parallel.
The step of each link between described change main capacitor and a plurality of sub-capacitor comprises: when the switch controlling signal that is sent to described switch is in low level, corresponding sub-capacitor is connected in series, and sub-capacitor and the main capacitor that is connected in series is connected in parallel.
By main capacitor and a plurality of sub-capacitor that is used for the compensating images distortion, can realize the present invention in whole or in part, the switch controlling signal that on-off controller level of response synchronizing signal and output have different duty; And a plurality of switch elements, receive each switch controlling signal, and adjust the total capacitance of main capacitor and sub-capacitor according to the switch controlling signal that receives.
Described on-off controller comprises a plurality of comparators, first parabolic signal that each comparator receives and horizontal-drive signal is synchronous and second parabolic signal synchronous with vertical synchronizing signal, and according to the comparative result of first and second parabolic signals is exported the switch controlling signal that each has a different duty.
Described on-off controller also comprises a plurality of resistance, and described resistance is used to adjust the voltage level of the direct voltage that is applied to second parabolic signal.When described switch is switched on, each switch element corresponding sub-capacitor that is connected in parallel, wherein each switch element is connected in parallel described sub-capacitor that is connected in parallel and main capacitor.
Described switch element comprises: according to first switch of operating from the switch controlling signal of on-off controller output; Come the transformer of output pulse signal according to the control of first switch; And change the second switch that links between main capacitor and the sub-capacitor according to pulse signal from transformer output.
Can realize the present invention in whole or in part by biasing circuit, described biasing circuit comprises: main capacitor is used for compensating the distortion that occurs in entire image; A plurality of sub-capacitors are used for compensating the distortion of the specific region that occurs in image; A plurality of comparators, it exports the switch controlling signal that each has different pulse durations according to first parabolic signal and second parabolic signal with direct voltage of different voltage levels synchronous with horizontal-drive signal; And a plurality of switch elements, it receives each switch controlling signal, and each links according to received switch controlling signal changes between main capacitor and the sub-capacitor.
Described on-off controller also comprises: a plurality of resistance are used to adjust the voltage level of the direct voltage that is applied to second parabolic signal.
Described switch element comprises: first switch, according to operating from the switch controlling signal of on-off controller output; Transformer comes output pulse signal according to the control of first switch; And second switch, change linking between main capacitor and the corresponding sub-capacitor according to pulse signal from the output of described transformer.
When second switch was switched on, second switch was connected in parallel main capacitor and corresponding sub-capacitor.When second switch was turned off, the total capacitance of main capacitor and sub-capacitor was a maximum.
Each comparator is exported the switch controlling signal that each has different pulse durations according to the voltage level that is applied to the direct voltage on second parabolic signal.When the voltage level of direct voltage when being high, described comparator produces the switch controlling signal with big pulse duration, and when the voltage level of direct voltage when low, described comparator generation has the switch controlling signal of small-pulse effect width.
Other advantage, purpose and feature of the present invention will be illustrated in following specification to a certain extent, and to those skilled in the art, to become apparent to a certain extent by studying following described content, perhaps can be known from the practice of the present invention.Objects and advantages of the present invention can realize and reach according to the content of being specifically noted in claims.
A kind of method that is used to drive biasing circuit comprises: produce and the first synchronous parabolic signal of horizontal-drive signal; Produce second parabolic signal of each direct voltage that is applied in different voltage levels; Export the switch controlling signal that each has different pulse durations according to first and second parabolic signals; And
Adjust the total capacitance of main capacitor and a plurality of sub-capacitors according to described switch controlling signal, described main capacitor compensates the distortion that occurs in the entire image, and described sub-capacitor compensates the distortion in the specific region that occurs in image.
Each switch controlling signal with different pulse durations of described output comprises: according to the voltage level of the direct voltage that is applied to second parabolic signal, export the switch controlling signal with different pulse durations.
When the voltage level of direct voltage when being high, the switch controlling signal that output has big pulse duration, and when the voltage level of direct voltage when low, export switch controlling signal with small-pulse effect width.
The total capacitance of described adjustment main capacitor and a plurality of sub-capacitors comprises: when the switch controlling signal of being exported is in low level, increase the total capacitance of main capacitor and corresponding sub-capacitor.
The total capacitance of described adjustment main capacitor and a plurality of sub-capacitors comprises: when the switch controlling signal of being exported is in high level, reduce the total capacitance of main capacitor and corresponding sub-capacitor.
Description of drawings
To describe the present invention in conjunction with the following drawings, in the accompanying drawings, the identical identical parts of reference number representative, wherein:
Fig. 1 shows the biasing circuit according to first embodiment of the invention;
Fig. 2 shows an example of the parabolic signal that is applied with direct voltage;
Fig. 3 shows from the switch controlling signal of comparator output;
Fig. 4 A shows the various piece by the image of biasing circuit compensation;
Fig. 4 B shows from the detected signal of contact point (CP1, CP2, CP3 and CP4);
Fig. 5 shows the complete waveform of the signal shown in Fig. 4 B;
Fig. 6 shows biasing circuit according to another embodiment of the present invention;
Fig. 7 shows another example of the parabolic signal that is applied with direct voltage;
Fig. 8 shows from the switch controlling signal of comparator output;
Fig. 9 shows from the high voltage pulse of transformer output; And
Figure 10 shows from the detected signal of contact point (CP1, CP2, CP3 and CP4).
Embodiment
First embodiment
Fig. 1 shows the biasing circuit according to first embodiment of the invention.This biasing circuit comprises on-off controller 10 and compensating circuit 11.Described on-off controller 10 receives horizontal-drive signal (H-SYNC) and parabolic voltage, and parabolic voltage and vertical synchronizing signal (V-SYNC) are synchronous here, and export a plurality of switch controlling signal CS1-CS4 that each has a different duty.Duty ratio is meant the ratio of " connection " time and " shutoff " time.On-off controller 10 comprises horizontal pulse transformer (HPT), saw-toothed wave generator 120, photoelectrical coupler 110 and a plurality of comparator 130,140,150 and 160.
Horizontal pulse transformer (HPT) receives horizontal-drive signal (H-SYNC), then, preferably, the voltage swing of received horizontal-drive signal (H-SYNC) is mixed with direct voltage, and export this mixed-voltage.It is sawtooth wave mode signal with received signal transition also that saw-toothed wave generator 120 receives from the signal of horizontal pulse transformer (HPT) output.The cycle of this sawtooth signal (frequency) is identical with the cycle (frequency) of described horizontal-drive signal (H-SYNC).
Light-emitting diode in the photoelectrical coupler 110 receives parabolic signal.Photoelectrical coupler 110 is converted to light signal with the parabolic signal that receives, and the signal after the output conversion.Phototransistor in the photoelectrical coupler 110 receives from the light signal of light-emitting diode and received light signal is reverted to the signal of telecommunication.Photoelectrical coupler 110 preferably is used as the electric insulation between input and the output.The received signal of the phototransistor of photoelectrical coupler 110 is input to "+" terminal of each comparator 130,140,150 and 160 through a plurality of capacitor CN1, CN2, CN3 and CN4 and a plurality of resistor R 11, R12, R13 and R14.
Fig. 2 shows an example of the parabolic signal that is applied with direct voltage.The level that is applied with the parabolic signal of direct voltage changes according to the level of direct voltage B+.From the pulse of horizontal pulse transformer (HPT) output by diode (D1) and capacitor (C30) rectification so that described direct voltage B+ to be provided.A plurality of variable resistance R15, R15, R17 and R18 receive this direct voltage, and the direct voltage of varying level is applied in respectively on the parabolic signal of "+" terminal that is input to comparator 130,140,10 and 160.
For example, variable resistance R15 puts on the highest DC voltage level (or first level DC voltage) on the parabolic signal that is input to comparator 130.Variable resistance R16 puts on the second high DC voltage level (or second level DC voltage) on the parabolic signal that is input to comparator 140.Variable resistance R17 puts on three level DC voltage on the parabolic signal that is input to comparator 150.Variable resistor R18 puts on the 4th level DC voltage on the parabolic signal that is input to comparator 160.
Comparator 130,140,150 and 160 each receive described sawtooth signal by "-" terminal, and receive the parabolic signal be applied with different DC voltage level by "+" terminal.Then, comparator 130,140,150 and 160 each its sawtooth signal that receives and parabolic signal are compared, thereby export impulse type switch controlling signal CS1, CS2, CS3 and CS4 according to these two signals respectively, as shown in Figure 3.
The pulse duration of switch controlling signal CS1, CS2, CS3 and CS4 changes according to the level that puts on the direct voltage on the parabolic signal respectively.For example, when the voltage level of the direct voltage on putting on the parabolic signal that is input to comparator 130 is maximum level, the switch controlling signal CS1 that comparator 130 outputs have maximum pulse.When the voltage level of the direct voltage on putting on the parabolic signal that is input to comparator 160 was minimum level, comparator 160 outputs had the switch controlling signal CS4 of minimum pulse width.
Have nothing in common with each other owing to be input to the DC voltage level of comparator 130,140,150 and 160, so the pulse duration of switch controlling signal CS1, CS2, CS3 and CS4 also has nothing in common with each other.Be sent to the grid of a plurality of switch TR1, TR2, TR3 and TR4 respectively from switch controlling signal CS1, CS2, CS3 and the CS4 of comparator 130,140,150 and 160 outputs.
Switch TR1, TR2, TR3 and TR4 are field-effect transistor, for example p type or n type, and be preferably the n type.Switch TR1, TR2, TR3 and TR4 link to each other with C27 with main compensation condenser (or S-capacitor) Cs and a plurality of son (or auxiliary) compensation condenser C21, C23, C25 respectively.The distortion of main compensation condenser Cs compensation entire image, and each sub-compensation condenser C21, C23, C25 or C27 compensate the distortion in the specific region that occurs in image.For example, switch TR1 links to each other with sub-compensation condenser C21 by drain electrode, and sub-compensation condenser C21 and main compensation condenser Cs are connected in parallel.Switch TR2 links to each other with sub-compensation condenser C23 by drain electrode, and switch TR3 links to each other with sub-compensation condenser C25 by drain electrode, and switch TR4 links to each other with sub-compensation condenser C27 by drain electrode.Each sub-compensation condenser C21, C23, C25 and C27 and main compensation condenser Cs are connected in parallel.
In the present invention, sub-compensation condenser is used for preventing that the specific region at image P1 from distortion taking place, shown in Fig. 4 A.For example, sub-compensation condenser C21 compensates center left or the right side area (PA that occurs in image together with main compensation condenser Cs, PA ') distortion in, sub-compensation condenser C23 compensation occurs in the center left subsequently or the right side part (PB of image, PB ') distortion in, and sub-compensation condenser C25 compensation occurs in the inferior center left or the right side part (PC subsequently of image, PC ') distortion in, at last, sub-compensation condenser C27 compensation occurs in the distortion of image left side or right side edge part (PD, PD ').
Fig. 4 B shows from the lead-out terminal of switch TR1, TR2, TR3 and TR4 or the detected signal of node CP1, CP2, CP3 and CP4.When the level of switch controlling signal CS1 when being high, switch TR1 connects.At this moment, sub-compensation condenser C21 and main compensation condenser Cs are connected in parallel, and the current potential of lead-out terminal CP1 drops to minimum in part or period T1 to T4.At part or period T5, because the level of switch controlling signal CS1 is low, so switch TR1 turn-offs.Like this, the current potential of lead-out terminal CP1 rises.
From part or period T6, the current potential of lead-out terminal CP1 descends.From part or period T7, because the discharge potential of main compensation condenser Cs is lower than the charging potential of sub-compensation condenser C21, therefore the diode that links to each other with switch TR1 is switched on.The part or period T7 to T10, sub-compensation condenser C21 and main compensation condenser are connected in parallel, and therefore, make the current potential of lead-out terminal CP1 drop to minimum once more.
The part or period T1 to T3 because the level of switch controlling signal CS2 be the height, so switch TR2 is switched on, sub-compensation condenser C23 and main compensation condenser Cs are connected in parallel.At this moment, the current potential of lead-out terminal CP2 is in floor level.To T5, the level of switch controlling signal CS2 is low at part or period T4, and therefore, switch TR2 is turned off, and the current potential of lead-out terminal CP2 rising.
From part or period T6, the current potential of lead-out terminal CP2 begins to descend, and from part or period T8, the discharge potential of main compensation condenser Cs becomes and is lower than the charging potential of sub-compensation condenser C23.Therefore, the diode that is connected with switch TR2 is switched on, and between part or period T8 and T10, sub-compensation condenser C23 and main compensation condenser Cs are connected in parallel.
To T2, because the level of switch controlling signal CS3 is a height, so switch TR3 is switched on, and sub-compensation condenser C25 and main compensation condenser Cs are connected in parallel at part or period T1.To T5, the level of switch controlling signal CS3 is low at part or period T3, and therefore, switch TR3 is turned off, and the current potential of lead-out terminal CP3 rising.
From part or period T6, the current potential of lead-out terminal CP3 begins to descend, and from part or period T9, the discharge potential of main compensation condenser Cs becomes and is lower than the charging potential of sub-compensation condenser C25.Therefore, between part or period T9 and T10, the diode that is connected with switch TR3 is switched on, and sub-compensation condenser C25 and main compensation condenser Cs are connected in parallel.
At part or period T1, because the level of switch controlling signal CS4 be a height, so switch TR4 is switched on, and sub-compensation condenser C27 and main compensation condenser Cs are connected in parallel.To T5, the level of switch controlling signal CS4 is low at part or period T2, and therefore, switch TR4 is turned off, and the current potential of lead-out terminal CP4 rising.From part or period T6, the current potential of lead-out terminal CP4 begins to descend, and from part or period T10, the discharge potential of main compensation condenser Cs becomes and is lower than the charging potential of sub-compensation condenser C27.Therefore, the diode that is connected with switch TR4 is switched on, and sub-compensation condenser C27 and main compensation condenser Cs are connected in parallel.In addition, at part or period T1, when all switch TR1, TR2, TR3 and TR4 are switched on, sub-compensation condenser C21, C23, C25 and C27 is parallel with one another is connected, and among sub-compensation condenser C21, C23, C25 and the C27 each all is connected in parallel with main compensation condenser Cs.The part or period T5 to T6, when switch TR1, TR2, TR3 and TR4 are turned off all, sub-compensation condenser C21, C23, C25 and C27 are not connected in parallel mutually, and sub-compensation condenser C21, C23, C25 and C27 and main compensation condenser Cs are not connected in parallel yet.Fig. 5 shows from the signal of lead-out terminal CP1, CP2, CP3 and CP4 output, the complete waveform of (as shown in Figure 4).Signal shown in Fig. 5 is applied in the anode of cathode ray tube (CRT), thereby compensates or prevent the distortion on image.
Second embodiment
Fig. 6 shows another example according to biasing circuit of the present invention.This biasing circuit comprises on-off controller 20 and compensating circuit 21 (or a plurality of switch element).On-off controller 20 receives horizontal-drive signal (H-SYNC) and parabolic voltage.After this, a plurality of switch controlling signals of on-off controller 20 outputs, wherein each switch controlling signal has a different duty ratio.Duty ratio is meant the ratio of the time of time of repetition " connection " and " shutoff ".On-off controller 20 comprises parabolic signal generator 210, a plurality of variable resistance R15, R16, R17 and R18 and a plurality of comparator 220,230,240 and 250.
Fig. 7 shows second parabolic signal that is applied with direct voltage.The voltage level that is applied with second parabolic signal of direct voltage can change according to DC voltage level.Described direct voltage is by the power circuit of television receiver or display unit or voltage source or is similar to the voltage that rectification circuit provided (B+) of Fig. 1.Among variable resistance R15, R16, R17 and the R18 each all receives direct voltage, and these direct voltages with different voltage levels are applied on second parabolic signal, second parabolic signal is imported into each in comparator 220,230,240 and 250 respectively.
For example, variable resistance R15 receives direct voltage from voltage (B+).Then, High Level DC Voltage level (or first level DC voltage) is applied on second parabolic signal that is input to comparator 220.Variable resistance R16 receives direct voltage from voltage (B+), and time High Level DC Voltage level (or second level DC voltage) is applied on second parabolic signal that is input to comparator 230 then.Subsequently, variable resistance R17 receives direct voltage from voltage (B+), and three level DC voltage is applied on second parabolic signal that is input to comparator 240.At last, variable resistance R18 puts on the 4th level DC voltage on second parabolic signal that is input to comparator 250.
Comparator 220,230,240 and 250 all receives first parabolic signal by "-" terminal, and receives second parabolic signal that is applied with different DC voltage level by "+" terminal.Comparator 220,230,240 and 250 all compares each first parabolic signal that receives and second parabolic signal, and exports impulse type switch controlling signal CS11, CS12, CS13 and CS14 based on these two signals.
Referring to Fig. 8, the pulse duration of switch controlling signal CS11, CS12, CS13 and CS14 changes according to the level that is applied to the direct voltage on second parabolic signal respectively.For example, when the voltage level of the direct voltage on putting on second parabolic signal that is input to comparator 220 is maximum level, the switch controlling signal CS11 that comparator 220 outputs have maximum pulse.When the voltage level of the direct voltage on putting on second parabolic signal that is input to comparator 250 was minimum level, comparator 250 outputs had the switch controlling signal CS14 of minimum pulse width.
Be imported into the grid of a plurality of switch TR1, TR2, TR3 and TR4 respectively from switch controlling signal CS11, CS12, CS13 and the CS14 of comparator 220,230,240 and 250 outputs.Switch TR1, TR2, TR3 and TR4 are field-effect transistor, as p type or n type, and be preferably the n type, and among switch TR1, TR2, TR3 and the TR4 each by the drain electrode be connected with transformer TN1, TN2, TN3 and TN4 respectively, wherein, described transformer output HIGH voltage pulse.More specifically, switch TR1, TR2, TR3 and TR4 come the operation of control transformer TN1, TN2, TN3 and TN4 respectively according to switch controlling signal CS11, CS12, CS13 and CS14.For example, when high level switch controlling signal CS11 is applied on the switch TR1, switch TR1 control transformer TN1, so switch TR1 output control signal when switch controlling signal CS11 is in high level part or section.
Referring to Fig. 9, because each a plurality of switch controlling signal CS11, CS12, CS13 and CS14 with different pulse durations are imported into switch TR1, TR2, TR3 and TR4 respectively, so also different from the width of the first, second, third and the 4th control impuls of transformer TN1, TN2, TN3 and TN4 output.For example, when the switch controlling signal CS11 with maximum pulse was imported into switch TR1, transformer TN1 output had the control impuls of Breadth Maximum.When the switch controlling signal CS14 with minimum pulse width was transfused to switch TR4, transformer TN4 output had the control impuls of minimum widith.
Be imported into switch TR11, TR12, TR13 and TR14 respectively from the control impuls of transformer TR11, TR12, TR13 and TR14 output.Switch TR11, TR12, TR13 and TR14 and main compensation condenser (or S-capacitor) Cs and a plurality of son (or auxiliary) compensation condenser C21, C23, C25 link to each other with C27.The distortion of main compensation condenser Cs compensation entire image, and the distortion that takes place in the specific region of each sub-compensation condenser C21, C23, C25 and C27 compensating images.For example, switch TR11 is connected with sub-compensation condenser C21 by drain electrode, and sub-compensation condenser C21 and main compensation condenser Cs are connected in parallel.Switch TR12 is connected with sub-compensation condenser C23 by drain electrode, and switch TR13 is connected with sub-compensation condenser C25 by drain electrode.At last, switch TR14 is connected with sub-compensation condenser C27 by drain electrode.Sub-compensation condenser C23, C25 and C27 all are connected in parallel with main compensation condenser.
In the present invention, sub-compensation condenser is used for preventing that the specific region at image from distortion taking place.For example, referring to Fig. 4 A, sub-compensation condenser C21 compensates the center left that occurs in image P1 or the distortion in the right side area (PA, PA ') together with main compensation condenser Cs.Sub-compensation condenser C23 compensation occurs in the center left subsequently of image or the distortion in the right side region part (PB, PB '), and compensation condenser C25 compensation occurs in the inferior center left subsequently of image or the distortion in the right side part (PC, PC ').At last, sub-compensation condenser C27 compensation occurs in the distortion in image left side or the right side edge part (PD, PD ').
Figure 10 shows from the lead-out terminal of switch TR11, TR12, TR13 and TR14 or the detected signal of node CP11, CP12, CP13 and CP14.With reference to Figure 10, when the level of first control impuls when being high, switch TR11 is switched on.At this moment, sub-compensation condenser C21 and main compensation condenser Cs are connected in parallel, and the part or period T1 to T4, the current potential of lead-out terminal CP11 drops to minimum.At part or period T5, because the level of first control impuls is low, switch TR11 is turned off.Therefore, the current potential of lead-out terminal CP11 rises.From part or period T6, the current potential of lead-out terminal CP11 descends.From part or period T7, sub-compensation condenser C21 and main compensation condenser Cs are connected in parallel.Therefore, the part or period T7 to T10, the current potential of lead-out terminal CP11 drops to minimum once more.
To T3, because the level of second control impuls is a height, so switch TR12 is switched on, and sub-compensation condenser C23 and main compensation condenser Cs are connected in parallel at part or period T1.At this moment, the current potential of lead-out terminal CP12 is in floor level.To T5, the level of second control impuls is low at part or period T4, and therefore, switch TR12 is turned off, and the current potential of lead-out terminal CP12 rising.From part or period T6, the current potential of lead-out terminal CP12 begins to descend, and from part or period T8, sub-compensation condenser C23 and main compensation condenser Cs are connected in parallel.Therefore, the part or period T8 to T10, the current potential of lead-out terminal CP12 drops to minimum once more.
To T2, because the level of the 3rd control impuls is a height, so switch TR13 is switched on, and sub-compensation condenser C25 and main compensation condenser Cs are connected in parallel at part or period T1.To T5, the level of the 3rd control impuls is low at part or period T3, and therefore, switch TR13 is turned off, and the current potential of lead-out terminal CP13 rising.From part or period T6, the current potential of lead-out terminal CP13 begins to descend, and when arriving part or period T9, sub-compensation condenser C25 and main compensation condenser Cs are connected in parallel.Therefore, the part or period T9 to T10, the current potential of lead-out terminal CP13 drops to minimum once more.
At part or period T1, because the level of the 4th control impuls be a height, so switch TR14 is switched on, and sub-compensation condenser C27 and main compensation condenser Cs are connected in parallel.To T5, the level of the 4th control impuls is low at part or period T2, and switch TR14 is turned off, and the current potential of lead-out terminal CP14 rising.From part or period T6, the current potential of lead-out terminal CP14 begins to descend, and from part or period T10, sub-compensation condenser C27 and main compensation condenser Cs are connected in parallel.Therefore, at fractional t1 0, the current potential of lead-out terminal CP14 drops to minimum once more.
In addition, at part or period T1, when all switch TR11, TR12, TR13 and TR14 all connect, sub-compensation condenser C21, C23, C25 and C27 is parallel with one another is connected, and sub-compensation condenser C21, C23, C25 and C27 all are connected in parallel with main compensation condenser.The part or period T5 to T6, when all switch TR11, TR12, TR13 and TR14 all turn-off, sub-compensation condenser C21, C23, C25 and C27 are not parallel with one another to be connected, and sub-compensation condenser C21, C23, C25 and C27 and main compensation condenser are not connected in parallel yet.
Advantage of the present invention is, (or link so that control getting in touch between main compensation condenser (or S-capacitor) and a plurality of sub-compensation condenser that is used for the distortion that occurs in the image specific region is compensated by utilizing each to have a plurality of different switches of different turn-on times, or connect, or confirm, or path), but compensated linear distortion and inner pin distortion.Therefore, can provide a kind of ultra-thin CRT display unit.
The present invention is not limited to said structure.And, therefore, getting in touch between the quantity of comparator and switch and main compensation condenser and the sub-compensation condenser (or link, or connect, or confirm, or the path) all different variations can be arranged.And the present invention can be used for taking place the display unit of other type of image fault, and is not limited only to the Brown tube that uses in television receiver or monitor.
Industrial usability
Above-described embodiment and advantage only are example, can not be interpreted as limitation of the present invention. The present invention can be applied to the device of other type at an easy rate. The description of this invention is intended that exemplary, and does not limit the scope of claim. Many replacements, modification and variation will be apparent for those skilled in the art. In the claims, device adds the structure that the function claim is intended to cover the described function of execution as described herein, not only is equal to form on the covered structure, and covers equivalent structure.
Claims (28)
1. one kind is used for display unit preventing and/or the biasing circuit of compensating images distortion, comprising:
Controller, it produces a plurality of first control signals, and each has a different duty ratio in described a plurality of first control signal, wherein said controller comprises that a plurality of comparators are to export described a plurality of first control signal, each comparator has first input and second input, wherein, first input of described a plurality of comparators receives same first signal, and second input of each described a plurality of comparator receives secondary signal, wherein, each secondary signal has a different DC component, and this DC component is determined the duty ratio of each first control signal; And
Compensating circuit, it has a plurality of first switches, at least one main capacitor and a plurality of sub-capacitor, corresponding first switch is provided between described main capacitor and the corresponding sub-capacitor, wherein, described a plurality of first switch is determined at least a in the following situation according to described a plurality of first control signals: whether described main capacitor and described a plurality of sub-capacitor are coupled, and mutually whether perhaps described a plurality of sub-capacitors coupling.
2. biasing circuit as claimed in claim 1, wherein, at least a in the charge path of described main capacitor and described a plurality of sub-capacitors or the discharge path determined in the coupling of described main capacitor and described a plurality of sub-capacitors.
3. biasing circuit as claimed in claim 1, wherein, described same first signal is first parabolic signal that parabola generator produced.
4. biasing circuit as claimed in claim 1, wherein, described same first signal is the sawtooth waveform signal that sawtooth waveform generator produced.
5. biasing circuit as claimed in claim 1, wherein, described same first signal and horizontal-drive signal are synchronous.
6. biasing circuit as claimed in claim 1, wherein, each described secondary signal is based on by producing with the capacitor of resistor in series coupling and with second parabolic signal that the variable resistance of given direct voltage coupling provides.
7. biasing circuit as claimed in claim 1, wherein, each described secondary signal produces based on second parabolic signal that provides by the photoelectrical coupler with light-emitting diode and phototransistor.
8. biasing circuit as claimed in claim 6, wherein, described second parabolic signal and vertical synchronizing signal are synchronous.
9. biasing circuit as claimed in claim 6, wherein, described given direct voltage is provided by power circuit, given voltage source or rectification circuit.
10. biasing circuit as claimed in claim 9, wherein, described rectification circuit comprises:
The horizontal pulse transformer, it receives horizontal-drive signal;
Diode, it is coupled in the output of described horizontal pulse transformer; And
Capacitor, it is coupled in described diode, and wherein, the node between described diode and the described capacitor that is coupled in described diode is used to provide described direct voltage.
11. biasing circuit as claimed in claim 2, wherein, described compensating circuit also comprises:
A plurality of second switches, each described second switch receives corresponding first control signal;
A plurality of transformers, each is transformer coupled in corresponding second switch, and based on corresponding first control signal corresponding second control signal is outputed to corresponding first switch, makes each second control signal have a different duty ratio; And
A plurality of diodes, each diode is coupled with corresponding transformers connected in parallel coupling and with corresponding first switch.
12. biasing circuit as claimed in claim 11, wherein, described first and second switches are field-effect transistor.
13. biasing circuit as claimed in claim 1, wherein, corresponding described first control signal is provided directly to corresponding first switch.
14. a biasing circuit that is used for display unit comprises:
Controller, it is used to produce a plurality of first control signals, and each has a different duty ratio in described a plurality of first control signal, wherein said controller comprises that a plurality of comparators are to export described a plurality of first control signal, each comparator has first input and second input, wherein, first input of described a plurality of comparators receives same first signal, and second input of described a plurality of comparators receives secondary signal, wherein, each secondary signal has a different DC component, and this DC component is determined the duty ratio of each first control signal; And
Compensating circuit, it responds described a plurality of first control signal, wherein, the duty ratio of corresponding first control signal is determined the distortion of which part of image is compensated, described compensating circuit comprises a plurality of first switches, at least one main capacitor and a plurality of sub-capacitor, corresponding first switch is provided between described main capacitor and the corresponding sub-capacitor, wherein, described a plurality of first switch is determined at least a in the following situation according to described a plurality of first control signals: whether described main capacitor and described a plurality of sub-capacitor are coupled, and mutually whether perhaps described a plurality of sub-capacitors coupling.
15. biasing circuit as claimed in claim 14, wherein, at least a in the charge path of described main capacitor and described a plurality of sub-capacitors or the discharge path determined in the coupling of described main capacitor and described a plurality of sub-capacitors.
16. biasing circuit as claimed in claim 14, wherein, described same first signal is first parabolic signal that parabola generator produced.
17. biasing circuit as claimed in claim 14, wherein, described same first signal is the sawtooth waveform signal that sawtooth waveform generator produced.
18. biasing circuit as claimed in claim 14, wherein, described same first signal and horizontal-drive signal are synchronous.
19. biasing circuit as claimed in claim 14, wherein, each described secondary signal produces based on second parabolic signal, and this second parabolic signal is by being provided with the capacitor of resistor in series coupling and with the variable resistance of given direct voltage coupling.
20. biasing circuit as claimed in claim 14, wherein, each described secondary signal produces based on second parabolic signal, and this second parabolic signal is provided by the photoelectrical coupler with light-emitting diode and phototransistor.
21. biasing circuit as claimed in claim 19, wherein, described second parabolic signal and vertical synchronizing signal are synchronous.
22. biasing circuit as claimed in claim 19, wherein, described given direct voltage is provided by power circuit, given voltage source or rectification circuit.
23. biasing circuit as claimed in claim 22, wherein, described rectification circuit comprises:
The horizontal pulse transformer, it is used to receive horizontal-drive signal;
Diode, it is coupled in the output of described horizontal pulse transformer; And
Capacitor, it is coupled in described diode, and wherein, the node between described diode and the described capacitor that is coupled in described diode is used to provide described direct voltage.
24. biasing circuit as claimed in claim 15, wherein, described compensating circuit also comprises:
A plurality of second switches, each second switch receive corresponding first control signal;
A plurality of transformers, each is described transformer coupled in corresponding second switch, and based on corresponding first control signal corresponding second control signal is outputed to corresponding first switch, makes each second control signal have a different duty ratio; And
A plurality of diodes, each diode is coupled with corresponding transformers connected in parallel coupling and with corresponding first switch.
25. biasing circuit as claimed in claim 24, wherein, described first and second switches are field-effect transistor.
26. biasing circuit as claimed in claim 14, wherein, corresponding first control signal is provided directly to corresponding first switch.
27. a method that is used to drive biasing circuit comprises:
Produce the switch controlling signal that each has a different duty, each step with switch controlling signal of a different duty of wherein said generation comprises: produce and the first synchronous parabolic signal of horizontal-drive signal; Produce second parabolic signal of each direct voltage that is applied with different voltage levels; And produce the described switch controlling signal that each has a different duty according to described first and second parabolic signals;
Described switch controlling signal is offered a plurality of switches; And
The total capacitance of interconnective main capacitor and a plurality of sub-capacitors is provided according to described switch controlling signal.
28. method as claimed in claim 27, wherein, the described total capacitance of main capacitance and a plurality of sub-electric capacity that provides comprises:
When the described switch controlling signal that sends to described switch is in high level, the corresponding described sub-electric capacity that is connected in parallel, and described sub-electric capacity that is connected in parallel and described main capacitance is connected in parallel.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040107844A KR100672412B1 (en) | 2004-12-17 | 2004-12-17 | Screen distortion correcting system and method for operating the same |
| KR10-2004-0107844 | 2004-12-17 | ||
| KR1020040107843A KR100751394B1 (en) | 2004-12-17 | 2004-12-17 | Screen distortion correcting system circuit and method for operating the same |
| KR1020040107844 | 2004-12-17 | ||
| KR10-2004-0107843 | 2004-12-17 | ||
| KR1020040107843 | 2004-12-17 | ||
| PCT/KR2005/002324 WO2006065013A2 (en) | 2004-12-17 | 2005-07-19 | Bias circuit and method for operating the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101390378A CN101390378A (en) | 2009-03-18 |
| CN101390378B true CN101390378B (en) | 2011-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005800467304A Expired - Fee Related CN101390378B (en) | 2004-12-17 | 2005-07-19 | Bias circuit and method for operating the same |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100672412B1 (en) |
| CN (1) | CN101390378B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1185696A (en) * | 1996-11-25 | 1998-06-24 | Lg电子株式会社 | Level-deflection S-shape correction signal circuit with variable capacity |
| EP0997867A1 (en) * | 1998-05-22 | 2000-05-03 | Matsushita Electric Industrial Co., Ltd. | Crt display image horizontal distortion correction device |
| EP1046282B1 (en) * | 1997-12-12 | 2001-10-17 | Thomson Licensing S.A. | Display driver apparatus |
| US6486618B1 (en) * | 2001-09-28 | 2002-11-26 | Koninklijke Philips Electronics N.V. | Adaptable inverter |
| CN1518333A (en) * | 2003-01-08 | 2004-08-04 | Lg������ʽ���� | Image distortion correcting equipment and its method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100266585B1 (en) * | 1996-11-25 | 2000-09-15 | 구자홍 | Horizontal deflection s-shaped correction signal circuit with variable capacitance |
| KR19980043936U (en) * | 1996-12-26 | 1998-09-25 | 배순훈 | S compensation capacitor switching protection circuit for monitor |
-
2004
- 2004-12-17 KR KR1020040107844A patent/KR100672412B1/en not_active IP Right Cessation
-
2005
- 2005-07-19 CN CN2005800467304A patent/CN101390378B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1185696A (en) * | 1996-11-25 | 1998-06-24 | Lg电子株式会社 | Level-deflection S-shape correction signal circuit with variable capacity |
| EP1046282B1 (en) * | 1997-12-12 | 2001-10-17 | Thomson Licensing S.A. | Display driver apparatus |
| EP0997867A1 (en) * | 1998-05-22 | 2000-05-03 | Matsushita Electric Industrial Co., Ltd. | Crt display image horizontal distortion correction device |
| US6486618B1 (en) * | 2001-09-28 | 2002-11-26 | Koninklijke Philips Electronics N.V. | Adaptable inverter |
| CN1518333A (en) * | 2003-01-08 | 2004-08-04 | Lg������ʽ���� | Image distortion correcting equipment and its method |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100672412B1 (en) | 2007-01-24 |
| CN101390378A (en) | 2009-03-18 |
| KR20060068904A (en) | 2006-06-21 |
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