CN205282059U - Drive device and display device - Google Patents
Drive device and display device Download PDFInfo
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- CN205282059U CN205282059U CN201521134988.7U CN201521134988U CN205282059U CN 205282059 U CN205282059 U CN 205282059U CN 201521134988 U CN201521134988 U CN 201521134988U CN 205282059 U CN205282059 U CN 205282059U
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Abstract
The utility model provides a drive arrangement for drive light emitting component. Being divided into two at least sub - stages through the luminous stage with light emitting component, promptly, increasing the level control signal of one two level, one of them level makes light emitting component normally luminous, and another level makes light emitting component turn -off or work under minimum electric current. Through the duty cycle of adjusting these two level control signals, can adjust the drive current of light emitting component when luminous, realize the accurate control to light emitting component's drive current. The utility model discloses the display device including drive arrangement is still provided.
Description
Technical field
The utility model relates to technique of display, more specifically, it relates to a kind of drive unit and display unit, it is possible to utilize the ON/OFF of the control signal control luminous element of many level, it is to increase drive the precision of electric current, thus improve display quality.
Background technology
Active matrix/organic light emitting display (ActiveMatrixOrganicLightEmittingDiode, AMOLED) it is one of the focus of current flat-panel monitor research field, compared with liquid-crystal display (LCD), Organic Light Emitting Diode (OrganicLightEmittingDiode, OLED) have that less energy-consumption, production cost are low, luminous, the advantage such as wide viewing angle and fast response time, at present, started to replace traditional LCD display screen in display field OLED display screen such as mobile phone, PDA, digital cameras. Wherein, pixel drive is the core technology content of displayer, has important Research Significance.
Utilizing stable voltage control brightness different with Thin Film Transistor-LCD (ThinFilmTransistor-LiquidCrystalDisplay, TFT-LCD), OLED belongs to electric current and drives, it is necessary to stable electric current controls luminescence. As shown in Figure 1, traditional AMOLED pixel-driving circuit adopts 2T1C pixel-driving circuit. This circuit is only by 1 driving thin film transistor DTFT, and a switching thin-film transistor T1 and storage capacitor C forms. Organic Light Emitting Diode OLED and DTFT is connected in series to and drives the grid of voltage of supply ELVDD, DTFT to be connected to the data line providing data signal Vdata by switching thin-film transistor T1. Sweep trace is connected to the grid of switching thin-film transistor T1, so that this row is carried out gating. Fig. 2 shows the operation sequential chart of pixel-driving circuit as shown in Figure 1, shows the sweep signal of sweep trace offer and the sequential relation of the data signal of data line offer.
When sweep trace gating (namely scanning) certain a line, in the t1 stage, sweep signal Gate (n) is low level signal, T1 conducting, data signal VdataWrite storage capacitor C. After this line scanning terminates, in the t2 stage, Gate (n) is changed into high level signal, and T1 ends, and the grid voltage being stored on storage capacitor C drives DTFT so that it is generation current drives OLED, makes OLED luminous.
According to the characteristic driving thin film transistor DTFT, by the electric current of DTFT it isWherein VGSIt is the gate source voltage of DTFT, VTHIt is the threshold voltage of DTFT, COXBeing DTFT zone of oxidation electric capacity, W and L is channel width and the length of DTFT respectively, and �� is mobility, VGS=Vdata-ELVDD. By VGSSubstitution obtains Therefore, in the driving circuit of OLED, drive the data signal V that electric current and source driving circuit exportdataPresent quadratic function relation.
Fig. 3 shows the relation between the driving electric current of Organic Light Emitting Diode and brightness. As can be seen from Figure 3, the brightness of Organic Light Emitting Diode increases along with the increase of current density, and dimmed along with the reduction of current density.
For the OLED display of certain brightness, this just determines the range of current provided to OLED, as shown in Figure 3, brightness scope is the indicating meter of 0��20000cd/m2, when adopting EFF50EL material, the scope driving electric current is 0��37mA/cm2, if only needing 0��24mA/cm2 when adopting high efficiency EFF80EL material. It thus is seen that along with material efficiency raising, also just require to drive current reduction, reduce power consumption simultaneously, under same greyscale level (8 bits are 256 greyscale level), it is necessary to improve the precision driving electric current.
Driving electric current according to DTFT It will be seen that when drive current range reduces, at the W/L of DTFT, than requiring time constant, the voltage range of Vdata reduces, and this just requires the V that source driving circuit exportsdataVoltage precision improve. The precision that the voltage of present source driving circuit exports can reach 5mV/ grey scale. If efficiency doubles again, it is necessary to reach 3mV/ grey scale, this has exceeded the technological ability of source driving circuit. The precision of Vdata can certainly be reduced by reducing the W/L value of DTFT. But the raising along with resolving power, when pixel space is limited, it is very difficult to increase the channel length of DTFT further.
The precision driving electric current can be improved consequently, it is desirable to a kind of, thus improve the device of display quality.
Practical novel content
Present disclosure proposes a kind of drive unit, driving method and display unit, can by luminous element glow phase being divided at least two sub-stages, namely the driving level of two level is provided in the glow phase of luminous element, a level makes luminous element normal luminous, and another level makes luminous element not luminous. When guaranteeing that brightness is constant, by reducing the relative dutycycle of two level, promote the driving electric current of luminous element when luminescence, thus improve the precision driving electric current.
According to first aspect of the present utility model, propose a kind of drive unit, for driven light-emitting element, comprise: source driving circuit, produce the line scan signals needed for driven light-emitting element, data signal, wherein, in the line scan signals valid period, to the Drive and Control Circuit write data signal of luminous element; Drive and Control Circuit, in the line scan signals valid period, while write data signal, the parameter of the driving element of write luminous element; Wherein, Drive and Control Circuit also receives level controling signal, and the glow phase at luminous element, according to the parameter of data signal, driving element and level controling signal, provide driving voltage to described driving element; And driving element, the driving voltage that Drive and Control Circuit provides is transformed into driving electric current, and is supplied to luminous element so that luminescence under the driving of the driving electric current that luminous element provides at driving element. Wherein, described level controling signal is configured to contain high level and lower level, a level in described high level and lower level makes driving voltage be not enough to drive described driving element, and another level in described high level and lower level makes Drive and Control Circuit to provide driving voltage to driving element according to the parameter of data signal and driving element, make described luminous element luminous.
Preferably, described level controling signal is the power supply signal of luminous element, wherein Drive and Control Circuit is at level controling signal for parameter according to data signal and driving element during high level provides driving voltage to driving element, by driving element driven light-emitting element, makes luminous element luminous; At level controling signal for the driving voltage provided during lower level cannot drive described driving element, thus luminous element is not luminous.
Preferably, the power supply signal of high level and low level power supply signal is produced by voltage selector switch; Wherein, described voltage selector switch comprises the high level voltage power supply of the power supply signal exporting high level and exports the low level voltage power supply of low level power supply signal; Described voltage selector switch receives selects signal, selects the power supply signal exporting one of high level and lower level according to selecting signal.
Preferably, it is in the power supply signal of described high level and low level power supply signal by the power supply signal setting making luminous element normal luminous; Another in the power supply signal of described high level and low level power supply signal is set to when applying this power supply signal, and under all data signals, driving element is all in off condition.
Preferably, described selection signal is produced by described source driving circuit or external circuit.
Preferably, described voltage selector switch is included in described source driving circuit.
Preferably, described level controling signal is transfused to the control end of described driving element, and wherein, the level controling signal of a level in high level and lower level makes driving element driven; The level controling signal of another level in high level and lower level makes driving element be in off condition or be in lightly conducting state.
Preferably, described level controling signal is produced by active driving circuit or external circuit.
Preferably, described level controling signal is synchronous with line scan signals.
Preferably, the high low level dutycycle of described level controling signal is adjustable.
Preferably, described voltage selector switch comprises: first crystal pipe, and grid receives the selection signal of described driving voltage controlling circuit, and source electrode receives the power supply signal of described high level, and drain electrode connects the grid of two-transistor; Two-transistor, source electrode receives the power supply signal of described high level, and drain electrode connects output terminal; First resistance, one end is connected with the grid of described two-transistor, the other end ground connection; Third transistor, grid connects the source electrode of the 4th transistor, and source electrode receives described low level power supply signal, and drain electrode connects output terminal; 4th transistor, grid receives the selection signal of described driving voltage controlling circuit, drain electrode ground connection; 2nd resistance, one end is connected to the source electrode of described third transistor, and the other end is connected to the grid of described third transistor.
According to second aspect of the present disclosure, it is provided that a kind of display unit, comprises according to drive unit of the present disclosure; And luminous element, luminous according to the driving electric current that drive unit provides.
Accompanying drawing explanation
By preferred embodiment of the present utility model being described below in conjunction with accompanying drawing, above-mentioned and other objects, features and advantages of the present utility model will be made clearly, wherein:
Fig. 1 is the structural representation of pixel-driving circuit in prior art;
Fig. 2 is the operation sequential chart of pixel-driving circuit of the prior art;
Fig. 3 shows the figure of the relation between the driving electric current of OLED and brightness;
Fig. 4 is the structural representation of traditional display unit;
Fig. 5 is the operation sequential chart of the drive unit in traditional display unit;
Fig. 6 is the structural representation of the drive unit according to the utility model embodiment;
Fig. 7 is the structural representation of the display unit according to the utility model embodiment;
Fig. 8 is the operation sequential chart of the drive unit in the display unit according to the utility model embodiment;
Fig. 9 shows the schematic diagram of the voltage selector switch according to the utility model embodiment;
Figure 10 shows the structural representation according to the utility model display unit of an embodiment again.
Figure 11 shows the structural representation of the display unit of the flat board of 8.4 inches;
Figure 12 shows the operation sequential chart of the drive unit in the display unit shown in Figure 11;
Figure 13 is the structural representation of the display unit according to the utility model embodiment;
Figure 14 is the operation sequential chart of the drive unit in the display unit according to the utility model embodiment;
Figure 15 shows the structural representation according to the utility model display unit of an embodiment again.
Figure 16 shows the operation sequential chart of the drive unit in the display unit shown in Figure 15.
Figure 17 shows the schema of the driving method of the drive unit according to the utility model embodiment.
Embodiment
Referring to accompanying drawing, example embodiment of the present utility model is described in detail. In the following description, some specific embodiments are only for describing object, and should not be construed and the utility model has any restriction, and are example of the present utility model. May cause understanding of the present utility model being caused obscure time, conventional structure or structure will be omitted.
Fig. 4 is the structural representation of traditional display unit. As shown in Figure 4, display unit comprises source driving circuit 400, Drive and Control Circuit, driving element and is arranged to the luminous element of the capable * a row of b. Source driving circuit 400 provides line scan signals G1-Gb and provides data signal S1-Sa. Although it is noted that only illustrate in Fig. 4 that source driving circuit provides data signal S1-Sa, but source driving circuit also provides sweep signal G1-Gb. This is also applicable for the diagram illustrated below. For the indicating meter of 8 bits, it is provided that 28=256 gray scale voltages. For the indicating meter of 10 bits, it is desirable to provide 210=1024 gray scale voltages. ELVDDRepresent the voltage of power supply signal.
Fig. 5 is the operation sequential chart of the drive unit in traditional display unit. At this, it is described for PMOS transistor. That is, lower level is significant level. When m line scan signals Gm is low, the luminous element of the capable whole a line of m is selected, and at this moment a data signal S1-Sa is written in the Drive and Control Circuit of a capable luminous element of m respectively. At the end of m line scan signals, m+1 is capable to be opened, and same a data signal S1-Sa is written in the Drive and Control Circuit of a capable luminous element of m+1 respectively, analogizes with this. After the data signal that m is capable is written in corresponding Drive and Control Circuit, Drive and Control Circuit provides the driving voltage corresponding with data signal to driving element, by driving element, driving voltage is transformed into driving electric current and carrys out driven light-emitting element. Generally ELVDDIt it is a constant voltage.
Fig. 6 is the structural representation of the drive unit 600 according to the utility model embodiment.
As shown in Figure 6, according to the utility model embodiment, drive unit 600 comprises: source driving circuit 610, for producing line scan signals and data signal according to the vision signal of input; Drive and Control Circuit 620, in the line scan signals valid period, while write data signal, the parameter of the driving element of write luminous element; Wherein, Drive and Control Circuit also receives level controling signal, and the glow phase at luminous element, according to the line scan signals of source driving circuit, data signal and level controling signal, produce driving voltage; And driving element 630, for the driving voltage that Drive and Control Circuit provides is transformed into driving electric current. Fig. 6 also show luminous element 640, according to the driving electric current that drive unit 600 provides, specifically, according to the driving electric current that driving element 630 provides, comes luminous. Described level controling signal is configured to contain high level and lower level, a level in described high level and lower level makes driving voltage be not enough to drive described driving element, and another level in described high level and lower level makes Drive and Control Circuit to provide driving voltage to driving element according to the parameter of data signal and driving element, the parameter of driving element can be compensated and make luminous element normal luminous by this driving voltage.
Fig. 7 is the structural representation of the display unit according to the utility model embodiment. Display unit shown in Fig. 7 utilizes the drive unit 600 according to the utility model embodiment described in Fig. 6. Fig. 8 is the operation sequential chart of the drive unit in the display unit according to the utility model embodiment.
As shown in Figure 7, provide the voltage ELVH and low level voltage ELVL of high level to display unit, and provide voltage selector switch to display unit. That is, described level controling signal is the power supply signal of luminous element.
As described in Figure 7, voltage selector switch receives the signal of two level, i.e. the power supply signal of high level and low level power supply signal. Source driving circuit exports to voltage selector switch and selects signal ELC, so that voltage selector switch optionally exports one of the power supply signal and low level power supply signal of high level. Drive and Control Circuit parameter according to data signal and driving element when the power supply signal that level controling signal is high level provides driving voltage to driving element, by driving element driven light-emitting element, makes luminous element luminous; At level controling signal for the driving voltage provided during low level power supply signal cannot drive described driving element, thus luminous element is not luminous.
As shown in Figure 8, the selection signal EL that source driving circuit exportsCFor dutycycle is the Pulse Width Control signal of D, the cycle of this pulse is consistent with the cycle of the line scan signals of display unit, and is divided into high level and lower level within the cycle of a line scan signals, so that the voltage ELV of the power supply signal of voltage selector switch outputDDAlso correspondingly it is divided into high level and lower level, it is expressed as the luminous sub-stage of luminous element and not luminous sub-stage.
At the voltage ELV of the power supply signal providedDDDuring for the high level that replaces and lower level. Data signal can not be write, because the signal at this moment write is no longer the data voltage corresponding to data signal when the voltage of power supply signal is lower level. Correspondingly, therefore, adjust line scan signals Gm so that it is the gating time is identical with the time length of the power supply signal of high level. Namely level controling signal is synchronous with line scan signals. Correspondingly, it is possible to adjustment ELCHigh low level dutycycle, to realize required driving current density, but, ELCMinimum duty cycle need to guarantee Data writing time.
According to embodiment of the present utility model, described voltage selector switch is arranged on source driving circuit outside. According to another embodiment, voltage selector switch can be included in source driving circuit. Voltage selector switch comprises the high level voltage power supply of the power supply signal exporting high level and exports the low level voltage power supply of low level power supply signal. According to an embodiment, described selection signal is produced by described source driving circuit or external circuit.
Fig. 9 shows the schematic diagram of the voltage selector switch according to the utility model embodiment. As shown in Figure 9, voltage selecting circuit 900 comprises: first crystal pipe T1, and grid receives the selection signal of described driving voltage controlling circuit, and source electrode receives the power supply signal of described high level, and drain electrode connects the grid of two-transistor T2; Two-transistor T2, source electrode receives the power supply signal of described high level, and drain electrode connects output terminal; First resistance R1, one end is connected with the grid of described two-transistor T2, one end ground connection; Third transistor T3, grid connects the source electrode of the 4th transistor T4, and source electrode receives described low level power supply signal, and drain electrode connects output terminal; 4th transistor T4, grid receives the selection signal of described driving voltage controlling circuit, drain electrode ground connection; 2nd resistance R2, one end is connected to the source electrode of described third transistor T3, and one end is connected to the grid of described third transistor T3.
At selection signal ELCSelect high level signal ELVDDHTime, transistor T1, T4 conducting, T3 ends, T2 conducting, therefore, the voltage EL of the power supply signal of outputVDDEqual ELVDDHThe forward voltage of-T1, therefore output voltage is approximate equals ELVDDHPower supply signal. At selection signal ELCSelect low level signal ELVDDLTime, T1, T4 end, and T2 ends, T3 conducting, the voltage EL of the power supply signal of outputVDDEqual ELVDDLThe forward voltage of-T3, therefore output voltage is approximate equals ELVDDLPower supply signal. Therefore, select signal EL by controlC, it is possible to optionally export high level and low level power supply signal.
Obviously, in the voltage selector switch shown in Fig. 9, it is illustrated for PMOS transistor. But, it should be noted that nmos pass transistor or other transistors can also be used, even other mode of connection, if input high level signal ELVDDHWith low level signal ELVDDL, the power supply signal of output optionally exports high level and low level power supply signal according to selection signal.
According to embodiment of the present utility model, voltage selector switch can also be integrated in source driving circuit. Figure 10 shows the structural representation according to the utility model display unit of an embodiment again. In the display unit according to the utility model embodiment, source driving circuit receives the power supply signal of high level and low level power supply signal, during the scanning of every a line, one of the power supply signal and low level power supply signal of high level is optionally exported to driving element, the power supply signal driven light-emitting element of high level is luminous, and low level power supply signal cannot driven light-emitting element luminescence.
In the above-described embodiments, the driving voltage provided in the glow phase of luminous element by adjustment, it is possible to the density of adjustment driving electric current, thus improve display quality.
Figure 11 shows a structural representation of the display unit of the flat board of 8.4 inches. Figure 12 shows the operation sequential chart of the drive unit in the display unit shown in Figure 11.
As shown in figure 12, the operation sequential of the display unit shown in Figure 11 is as follows:
1) reseting stage t1, drive control signal EM and sweep signal Gate is high level, transistor T5 and transistor T6 disconnects, transistor T3 and transistor T4 also disconnects, reset signal Reset signal is lower level, electric capacity C1 is resetted by transistor T7 and transistor T1, and namely the voltage at electric capacity C1 two ends is ELV respectivelyDDAnd Vint.
2) in data write stage t2, drive control signal EM and reset signal Reset signal are high level, and T5, T6, T1 and T7 disconnect, and sweep signal Gate signal is lower level, T4 and T2 conducting. Owing to reseting stage is to the N2 point write Vint negative potential of electric capacity C1, T3 conducting, so T3 writes ELV by T2 to N2DD-VthLevel, and data data writes data signal data by T4 to the N1 point of C1. The voltage at C1 two ends is exactly ELVDD-Vth-Vdata��
3) glow phase t3, reset signal Reset and sweep signal Gate are high level, and T1, T7, T2 and T4 turn off, drive control signal EM signal is lower level, then T5 and T6 conducting, and T3 is conducting also, ELVDD ' level passes through the N1 end of T5 clamper to C1, and N2 point level just becomes ELVDD��+ELVDD-Vth-Vdata��
Driving electric current at glow phase t3, T3 is
ELVDD' function be reduce resistance drop impact, its be used as datum.
It may be seen that drive the voltage ELV of electric current and power supply signalDDIt doesn't matter. Generally ELVDD' it is single level signal.
Figure 13 is the structural representation of the display unit according to the utility model embodiment. As shown in figure 13, also comprise reference voltage control circuit according to the drive unit of the display unit of the utility model embodiment, it is configured to produce the reference voltage of high level and low level reference voltage.
Specifically, it is configured to produce the reference voltage of high level and low level reference voltage according to the reference voltage control circuit of the drive unit of the utility model embodiment. Described Drive and Control Circuit is configured to according to reference voltage, provides the signal of high/low level to the control end of driving element. The signal of a level in high level and lower level makes driving element driven; The signal of another level in high level and lower level makes driving element be in off condition or be in lightly conducting state.
The reference voltage of high level and low level reference voltage is produced by reference voltage control circuit. General voltage amplitude is by being programmed into Row sum-equal matrix.
Figure 14 is the operation sequential chart of the drive unit in the display unit according to the utility model embodiment.
As shown in figure 14, the operation sequential of the drive unit in the display unit shown in Figure 13 is as follows:
1) reseting stage t1, drive control signal EM and sweep signal Gate is high level, transistor T5 and transistor T6 disconnects, transistor T3 and transistor T4 also disconnects, reset signal Reset signal is lower level, electric capacity C1 is resetted by transistor T7 and transistor T1, and namely the voltage at electric capacity C1 two ends is ELV respectivelyDDAnd Vint.
2) in data write stage t2, drive control signal EM and reset signal Reset signal are high level, and T5, T6, T1 and T7 disconnect, and sweep signal Gate signal is lower level, T4 and T2 conducting. Owing to reseting stage is to the N2 point write Vint negative potential of electric capacity C1, T3 conducting, so T3 writes ELV by T2 to N2DD-VthLevel, and data data writes data signal data by T4 to the N1 point of C1. The voltage at C1 two ends is exactly ELVDD-Vth-Vdata��
3) glow phase t3, comprises luminous sub-stage t4 alternately and not luminous sub-stage t5. Reset signal Reset and sweep signal Gate is high level, and T1, T7, T2 and T4 turn off, and drive control signal EM signal is lower level, then T5 and T6 conducting, and T3 is conducting also, and the level of Vref passes through the N1 end of T5 clamper to C1, and N2 point level just becomes Vref+ELVDD-Vth-Vdata. In the t4 stage, Vref is low level reference voltage Vref L, namely, it is possible to control T3 normally and make the level of luminous element luminescence. In the t5 stage, Vref turns into the reference voltage Vref H of high level, and owing to Vref level raises, the level of the N2 end of C also raises so that T3 ends, and luminous element is not luminous.
In this embodiment, it is possible to by adjusting the dutycycle of VrefL and VrefH, the luminosity of adjustment luminous element, the i.e. current density of luminous element.
Figure 15 shows the structural representation according to the utility model display unit of an embodiment again.
According to embodiment of the present utility model, produce the reference voltage of high level and low level reference voltage by external circuit. According to embodiment of the present utility model, drive unit comprises source driving circuit, Drive and Control Circuit, driving element and luminous element. Source driving circuit exports to the reference voltage control circuit of the reference voltage and low level reference voltage that receive high level and selects signal, so that reference voltage control circuit optionally exports one of the reference voltage and low level reference voltage of high level, to provide the driving voltage of high level and low level driving voltage by described Drive and Control Circuit.
Figure 16 shows the operation sequential chart of the drive unit in the display unit shown in Figure 15. The selection signal E that reference voltage selection circuit exports according to source driving circuiton, optionally export VrefH or VrefL.
Although figure 6 illustrates drive unit, showing display unit at Fig. 7, Figure 10, Figure 13 and Figure 15, showing voltage selector switch at Fig. 9, but those skilled in the art are it is understood that these circuit, device can adopt other structures. Such as, the display unit with other structures can be applied to according to the drive unit of the utility model embodiment, the drive unit with other structures can be applied to according to the voltage selector switch of the utility model embodiment. These figure only exemplarily illustrate. Such as, the structure that Fig. 9 shows voltage selector switch can be not limited to shown structure.
Figure 17 shows the schema of the driving method of the drive unit according to the utility model embodiment.
As shown in figure 17, comprise according to the driving method of the drive unit of the utility model embodiment: step S1710, sweep trace of being expert at provides line scan signals; Step S1720, provides data signal on the data line; Step S1730, it is provided that level controling signal; Step S1740, in the line scan signals valid period, while write data signal, by the parameter read-in Drive and Control Circuit of the driving element of luminous element; Step S1750, in the glow phase of luminous element, according to the parameter of data signal, driving element and level controling signal, provides driving voltage to described driving element. Wherein, described level controling signal is configured to contain high level and lower level, a level in described high level and lower level makes driving voltage be not enough to drive described driving element, and another level in described high level and lower level makes to provide driving voltage to driving element according to the parameter of data signal and driving element, make described luminous element luminous.
Step S1710��S1730 can perform parallel. In other words, in advance line scanning line is connected with line scan signals source, data line is connected with data source, the source of level controling signal is connected with the line of level controling signal. Then, perform step S1710��S1730 so that display unit enters the data write stage, and namely line scan signals is effective, writes data signal simultaneously. Now, in step S1740, by the parameter read-in Drive and Control Circuit of the driving element of luminous element. Then, when display unit enters the glow phase of luminous element, in step S1750, according to the parameter of the data signal of write, driving element and level controling signal, provide driving voltage to described driving element.
According to embodiment of the present utility model, level controling signal can be the power supply signal of luminous element. That is, Drive and Control Circuit is at level controling signal for parameter according to data signal and driving element during high level provides driving voltage to driving element, by driving element driven light-emitting element, makes luminous element luminous; At level controling signal for the driving voltage provided during lower level cannot drive described driving element, thus luminous element is not luminous.
According to embodiment of the present utility model, level controling signal can apply the control end in driving element. Wherein, the level controling signal of a level in high level and lower level makes driving element driven; The level controling signal of another level in high level and lower level makes driving element be in off condition or be in lightly conducting state.
According to embodiment of the present utility model, level controling signal is synchronous with line scan signals. That is, the gating time of line scan signals is identical with the time length of the power supply signal of high level, so that do not write data signal when power supply signal is low voltage.
It is noted that in the above description, only in an illustrative manner, show technical scheme of the present disclosure, but and do not mean that the disclosure is confined to above-mentioned steps and structure. In a likely scenario, it is possible to as required step and structure are adjusted and accept or reject. Therefore, some step and unit not implement the necessary element of overall thought of the present disclosure. Therefore, the disclosure necessary technology feature is only limited to the minimum requirement that can realize overall thought of the present disclosure, and not by the restriction of above specific examples.
So far in conjunction with the preferred embodiments the disclosure is described. It is to be understood that those skilled in the art are not when departing from spirit and scope of the present disclosure, it is possible to carry out various other change, replacement and interpolation. Therefore, the scope of the present disclosure is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (12)
1. a drive unit, for driven light-emitting element, comprising:
Source driving circuit, produces the line scan signals needed for driven light-emitting element, data signal, wherein, in the line scan signals valid period, to the Drive and Control Circuit write data signal of luminous element;
Drive and Control Circuit, in the line scan signals valid period, while write data signal, the parameter of the driving element of write luminous element; Wherein, Drive and Control Circuit also receives level controling signal, and the glow phase at luminous element, according to the parameter of data signal, driving element and level controling signal, provide driving voltage to described driving element; And
Driving element, is transformed into driving electric current by the driving voltage that Drive and Control Circuit provides, and is supplied to luminous element so that luminescence under the driving of the driving electric current that luminous element provides at driving element;
Wherein, described level controling signal is configured to contain high level and lower level, a level in described high level and lower level makes driving voltage be not enough to drive described driving element, and another level in described high level and lower level makes Drive and Control Circuit to provide driving voltage to driving element according to the parameter of data signal and driving element, make described luminous element luminous.
2. drive unit according to claim 1, wherein, described level controling signal is the power supply signal of luminous element, wherein Drive and Control Circuit at level controling signal for parameter according to data signal and driving element during high level provides driving voltage to driving element, by driving element driven light-emitting element, make luminous element luminous; At level controling signal for the driving voltage provided during lower level cannot drive described driving element, thus luminous element is not luminous.
3. drive unit according to claim 2, wherein, is produced the power supply signal of high level and low level power supply signal by voltage selector switch; Wherein, described voltage selector switch comprises the high level voltage power supply of the power supply signal exporting high level and exports the low level voltage power supply of low level power supply signal; Described voltage selector switch receives selects signal, selects the power supply signal exporting one of high level and lower level according to selecting signal.
4. the power supply signal setting making luminous element normal luminous wherein, is in the power supply signal of described high level and low level power supply signal by drive unit according to claim 3; Another in the power supply signal of described high level and low level power supply signal is set to when applying this power supply signal, and under all data signals, driving element is all in off condition.
5. drive unit according to claim 3, wherein, described selection signal is produced by described source driving circuit or external circuit.
6. drive unit according to claim 3, wherein, described voltage selector switch is included in described source driving circuit.
7. drive unit according to claim 1, wherein, described level controling signal is transfused to the control end of described driving element, and wherein, the level controling signal of a level in high level and lower level makes driving element driven; The level controling signal of another level in high level and lower level makes driving element be in off condition or be in lightly conducting state.
8. drive unit according to claim 7, wherein, described level controling signal is produced by active driving circuit or external circuit.
According to the drive unit one of claim 1-8 Suo Shu, wherein, 9. described level controling signal is synchronous with line scan signals.
According to the drive unit one of claim 1-8 Suo Shu, wherein, 10. the high low level dutycycle of described level controling signal is adjustable.
11. drive units according to claim 3, wherein, described voltage selector switch comprises: first crystal pipe, and grid receives the selection signal of described driving voltage controlling circuit, source electrode receives the power supply signal of described high level, and drain electrode connects the grid of two-transistor; Two-transistor, source electrode receives the power supply signal of described high level, and drain electrode connects output terminal; First resistance, one end is connected with the grid of described two-transistor, the other end ground connection; Third transistor, grid connects the source electrode of the 4th transistor, and source electrode receives described low level power supply signal, and drain electrode connects output terminal; 4th transistor, grid receives the selection signal of described driving voltage controlling circuit, drain electrode ground connection; 2nd resistance, one end is connected to the source electrode of described third transistor, and the other end is connected to the grid of described third transistor.
12. 1 kinds of display unit, it is characterised in that, comprising:
Drive unit as described in the arbitrary item in claim 1 to 11; And
Luminous element, luminous according to the driving electric current that drive unit provides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521134988.7U CN205282059U (en) | 2015-12-31 | 2015-12-31 | Drive device and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521134988.7U CN205282059U (en) | 2015-12-31 | 2015-12-31 | Drive device and display device |
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| Publication Number | Publication Date |
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| CN205282059U true CN205282059U (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521134988.7U Withdrawn - After Issue CN205282059U (en) | 2015-12-31 | 2015-12-31 | Drive device and display device |
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| CN (1) | CN205282059U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105609053A (en) * | 2015-12-31 | 2016-05-25 | 京东方科技集团股份有限公司 | Driving device, driving method and display device |
| CN106920513A (en) * | 2017-05-12 | 2017-07-04 | 京东方科技集团股份有限公司 | The drive circuit of display panel, display panel and display device |
| CN107274832A (en) * | 2017-08-15 | 2017-10-20 | 深圳市华星光电半导体显示技术有限公司 | Drive circuit and display device |
| US10991310B2 (en) | 2018-01-31 | 2021-04-27 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Driving circuit and display device |
-
2015
- 2015-12-31 CN CN201521134988.7U patent/CN205282059U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105609053A (en) * | 2015-12-31 | 2016-05-25 | 京东方科技集团股份有限公司 | Driving device, driving method and display device |
| WO2017113678A1 (en) * | 2015-12-31 | 2017-07-06 | 京东方科技集团股份有限公司 | Driver device, driving method, and display device |
| US10319295B2 (en) | 2015-12-31 | 2019-06-11 | Boe Technology Group Co., Ltd. | Driving apparatus, driving method and display apparatus |
| CN106920513A (en) * | 2017-05-12 | 2017-07-04 | 京东方科技集团股份有限公司 | The drive circuit of display panel, display panel and display device |
| CN106920513B (en) * | 2017-05-12 | 2019-09-24 | 京东方科技集团股份有限公司 | Driving circuit, display panel and the display device of display panel |
| US10643541B2 (en) | 2017-05-12 | 2020-05-05 | Boe Technology Group Co., Ltd. | Driving circuit of display panel, display panel and display device |
| CN107274832A (en) * | 2017-08-15 | 2017-10-20 | 深圳市华星光电半导体显示技术有限公司 | Drive circuit and display device |
| US10991310B2 (en) | 2018-01-31 | 2021-04-27 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Driving circuit and display device |
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