CN112017591A - Emission control drive circuit and organic light emitting display device - Google Patents
Emission control drive circuit and organic light emitting display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The invention provides an emission control drive circuit and an organic light-emitting display device, wherein the emission control drive circuit comprises N-level emission control drive units, a control signal output by an N-1 level emission control drive unit is connected to the nth level emission control drive unit, wherein N and N are positive integers, and N is more than or equal to 1 and less than or equal to N; the nth-stage emission control driving unit comprises an up-down pulling control unit, an up-pulling module, a maintaining module, a down-pulling module, a leakage-proof module, a first other module, a second other module and a third other module; wherein; the pull-up module, the electricity leakage prevention module and the third other module output the control signal of the current level. According to the emission control drive circuit and the organic light-emitting display device, the emission control drive circuit provides the control signal En for the matched pixel drive circuit, so that the light-emitting time of the OLED pixel can be controlled, the OLED pixel can be judged as a low gray scale picture by the eyes, the uniformity of the picture is improved, the brightness and the gray scale of the organic light-emitting display device are adjusted, and the dimming function of the organic light-emitting display device is realized.
Description
Technical Field
The invention relates to the field of display, in particular to an emission control driving circuit and an organic light emitting display device.
Background
An Organic Light Emitting Diode (OLED) display panel has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, a viewing angle of nearly 180 degrees, a wide range of use temperature, and capability of realizing flexible display and large-area full-color display, and is considered as a display device having the most potential for development in the industry.
OLEDs can be classified into two broad categories, namely, direct addressing and Thin Film Transistor (TFT) Matrix addressing, which are Passive Matrix OLEDs (PM) and Active Matrix OLEDs (AM) according to driving methods. The AMOLED display panel is internally provided with a plurality of pixels which are arranged in an array mode, and each pixel is driven through an OLED pixel driving circuit.
As shown in fig. 1, the conventional AMOLED pixel driving circuit has a 2T1C structure, including: a switching thin film transistor T1, a second driving thin film transistor T2, and a storage capacitor Cst. When the switching thin film transistor T1 is turned on by receiving a scan line (Gate) command, a Data line (Data) voltage signal is transmitted to the storage capacitor Cst and a switching command is issued to the second driving thin film transistor T2, at this time, the drain of the second driving thin film transistor T2 is connected to the high potential VDD, the source of the second driving thin film transistor T2 is connected to the anode of the OLED, and when the second driving thin film transistor T2 is turned on, it drives the OLED to emit light current.
The conventional OLED pixel driving circuit shown in fig. 1 is simple and can drive an OLED to emit light only, so that the phenomenon that the current of the OLED is unstable due to low driving current at low gray scale and the picture Mura defect is easily generated cannot be effectively avoided.
Disclosure of Invention
The present invention provides an emission control driving circuit and an organic light emitting display device, which can achieve the purpose of adjusting brightness and gray scale and provide uniformity of images.
The invention provides an emission control drive circuit, which comprises N-level emission control drive units, wherein a control signal output by an N-1 level emission control drive unit is connected to the nth level emission control drive unit, wherein N and N are positive integers, and N is more than or equal to 1 and less than or equal to N; the emitting control driving circuit is provided with a high voltage signal, a low voltage signal, an emptying signal, a first period signal, a second period signal and a brightness adjusting signal with period control at the periphery, and the nth stage emitting control driving unit is connected with the high voltage signal, the low voltage signal, the first period signal, the second period signal, the brightness adjusting signal and the emptying signal; the nth-stage emission control driving unit comprises an up-down pulling control unit (001), a up-pulling module (002), a maintaining module (003), a down-pulling module (004), an anti-creeping module (005), a first other module (006), a second other module (007) and a third other module (008); wherein the pull-up and pull-down control unit (001), the pull-up module (002), the pull-down module (004) and the first other module (006) are connected to the pull-up control node; the sustain module (003), the pull-down module (004) and the second further module (007) are connected to a sustain control node; the pull-up module (002), the pull-down module (004) and the third other module (008) output a current-level control signal, and the electricity leakage prevention module (005) is connected with the current-level control signal.
Furthermore, the up-down pull control unit (001) comprises a first control switch and a second control switch, a first path end of the first control switch is connected with the high-voltage signal, and a second path end of the first control switch is connected with a first path end of the second control switch; the control end of the second control switch is connected with the current-stage periodic signal, and the second path end of the second control switch is connected with the pull-up control node; when n is 1, the control end of a first control switch of a pull-up and pull-down control unit of the first-stage emission control driving unit is connected with a brightness adjusting signal; when n is more than 1, the control end of the first control switch is connected with the control signal output by the (n-1) th-stage emission control driving unit.
Furthermore, the up-down pull control unit (001) comprises a first control switch and a second control switch, a control end of the first control switch is connected with the current-stage periodic signal, and a second path end of the first control switch is connected with a first path end of the second control switch; the control end of the second control switch is connected with the next-stage periodic signal, and the second path end of the second control switch is connected with the upper pull control node; when n is 1, a first path end of a first control switch of a pull-up and pull-down control unit of the first-stage emission control driving unit is connected with a brightness adjusting signal; when n is more than 1, the control end of the first control switch is connected with the control signal output by the (n-1) th-stage emission control driving unit.
Furthermore, the maintaining module (003) includes a third control switch, a fourth control switch, a fifth control switch and a second capacitor, wherein a first path end of the third control switch is connected to the fourth control switch and a second plate of the second capacitor, a second path end of the third control switch and a second path end of the fifth control switch are connected to the low-voltage signal, a first path end of the fourth control switch and a first plate of the second capacitor are connected to the current-stage periodic signal, and a second path end of the fourth control switch and a first path end of the fifth control switch are connected to the maintaining control node; when n is 1, the control end of the third control switch and the control end of the fifth control switch of the maintaining module of the first-stage emission control driving unit are both connected with the brightness adjusting signal; when n is more than 1, the control end of the third control switch and the control end of the fifth control switch are both connected with the control signal output by the (n-1) th-stage emission control driving unit.
Furthermore, the maintaining module (003) includes a fourth control switch, a fifth control switch and a second capacitor, a first pole plate of the second capacitor and a first path end of the fourth control switch are both connected to the current-stage periodic signal, a control end of the fourth control switch is connected to a second pole plate of the second capacitor, a second path end of the fourth control switch and a first path end of the fifth control switch are connected to a maintaining control node, and a second path end of the fifth control switch is connected to the low-voltage signal; when n is 1, the control end of a fifth control switch of a maintaining module of the first-stage emission control driving unit is connected with the brightness adjusting signal; when n is more than 1, the control ends of the fifth control switches are connected with the control signals output by the (n-1) th-stage emission control driving unit.
Furthermore, the maintaining module (003) includes a fourth control switch, a fifth control switch and a second capacitor, a first pole plate of the second capacitor and a first path end of the fourth control switch are both connected to the present-stage periodic signal, a control end of the fourth control switch is connected to a second pole plate of the second capacitor, a second path end of the fourth control switch and a first path end of the fifth control switch are connected to a maintaining control node, a control end of the fifth control switch T5 is connected to a pull-up control node, and a second path end of the fifth control switch is connected to a low-voltage signal.
Furthermore, the pull-up module (002) includes a tenth control switch and a first capacitor, a control end of the tenth control switch is connected to the pull-up control node, a first path end of the tenth control switch is connected to the high voltage signal, a first plate of the first capacitor is connected to the pull-up control node, and a second path end of the tenth control switch and a second plate of the first capacitor output the control signal of the current stage.
Further, the pull-down module (004) includes a sixth control switch, a seventh control switch and an eighth control switch, a control end of the sixth control switch, a control end of the seventh control switch and a control end of the eighth control switch are all connected to the maintaining control node, a first path end of the sixth control switch is connected to the pull-up control node, a second path end of the sixth control switch is connected to the low-voltage signal, a first path end of the seventh control switch outputs the control signal of the current stage, a second path end of the seventh control switch is connected to a first path end of the eighth control switch, and a second path end of the eighth control switch is connected to the low-voltage signal.
Furthermore, the electricity leakage prevention module (005) comprises a ninth control switch, a control end of the ninth control switch is connected with the current-stage control signal, a first path end of the ninth control switch is connected with the high-voltage signal, and a second path end of the ninth control switch is connected with the first path end of the eighth control switch.
Further, the pull-down module (004) includes a sixth control switch, a seventh control switch and an eighth control switch, a control end of the sixth control switch and a control end of the eighth control switch are both connected to the maintaining control node, a control end of the seventh control switch is connected to the high-voltage signal or the current-stage periodic signal, a first path end of the sixth control switch is connected to the pull-up control node, a second path end of the sixth control switch is connected to the low-voltage signal, a first path end of the seventh control switch outputs the current-stage control signal, a second path end of the seventh control switch is connected to the first path end of the eighth control switch, and a second path end of the eighth control switch is connected to the low-voltage signal.
Further, the first other module (006) includes an eleventh control switch, the second other module (007) includes a thirteenth control switch, and the third other module (008) includes a twelfth control switch, wherein a control end of the eleventh control switch, a control end of the twelfth control switch, and a control end of the thirteenth control switch are all connected to the clear signal, a first path end of the eleventh control switch is connected to the pull-up control node, a first path end of the thirteenth control switch is connected to the sustain control node, a first path end of the twelfth control switch outputs the current-level control signal, and a second path end of the eleventh control switch, a second path end of the twelfth control switch, and a second path end of the thirteenth control switch T13 are all connected to the low-voltage signal.
The invention also provides an organic light-emitting display device, which comprises criss-cross scanning lines and data lines, pixel driving circuits defined by the scanning lines and the data lines in a crossed manner, light-emitting units connected with the pixel driving circuits, and emission control driving circuits connected with the corresponding pixel driving circuits, wherein the light-emitting units are positioned between a first power supply and a second power supply; the emission control driving circuit of any one of claims 1 to 11, which is disposed on one side or both sides of an organic light emitting display device
According to the emission control drive circuit and the organic light-emitting display device, the emission control drive circuit provides the control signal En for the matched pixel drive circuit, so that the light-emitting time of the OLED pixel can be controlled, the OLED pixel can be judged as a low gray scale picture by the eyes, the uniformity of the picture is improved, the brightness and the gray scale of the organic light-emitting display device are adjusted, and the dimming function of the organic light-emitting display device is realized.
Drawings
The present invention will be further described in the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic diagram of a conventional OLED pixel driving circuit;
FIG. 2 is a schematic diagram of a pixel display driving circuit according to the present invention;
FIG. 3 is a waveform diagram of the pixel display driving circuit shown in FIG. 1;
FIG. 4 is a schematic diagram of an emission control driving circuit according to the present invention;
FIG. 5 is a schematic diagram of the internal structure of the first embodiment of the emission control driving circuit shown in FIG. 4;
FIG. 6 is a waveform diagram of the emission control driving circuit shown in FIG. 5;
FIG. 7 is a diagram of analog signals for the emission control driver circuit of FIG. 5;
FIG. 8 is a diagram showing an internal structure of a second embodiment of the emission control driving circuit shown in FIG. 4;
fig. 9 is a waveform diagram of the emission control driving circuit shown in fig. 8;
FIG. 10 is a schematic diagram of the internal structure of the third embodiment of the emission control driving circuit shown in FIG. 4;
fig. 11 is a schematic diagram of the internal structure of the fourth embodiment of the emission control driving circuit shown in fig. 4.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
As shown in fig. 2, the present invention discloses an organic light emitting display device, which includes criss-cross scan lines 10 and data lines 20, pixel driving circuits 200 defined at intersections of the scan lines 10 and the data lines 20, light emitting units (OLEDs) 30 connected to the pixel driving circuits 200, and emission control driving circuits 100 connected to the corresponding pixel driving circuits 200, wherein the light emitting units 30 are located between a first power source (the first power source is a positive power source whose voltage is ELVDD) and a second power source (the second power source is a negative power source whose voltage is ELVSS).
The emission control driving circuit 100 provides a control signal En to the corresponding pixel driving circuit 200, so as to control the light emitting time of each row of pixel driving circuits 200, and to adjust the brightness and gray scale of the OLED panel by using the light emitting time difference of the OLED pixels, thereby improving the image display quality.
In the present embodiment, the pixel driving circuit 200 has a 3T1C structure, and includes a first switching thin film transistor T1 located at the intersection of the scan line 10 and the data line 20, a second driving thin film transistor T2 and a third switching thin film transistor T3 sequentially connected between the first power source VDD and the light emitting cell OLED 30, and a storage capacitor Cst.
It should be noted that each of the thin film transistors according to the following embodiments includes a control terminal, a first via terminal, and a second via terminal, where the control terminal is a gate, one of the via terminals is a source, and the other via terminal is a drain. When the voltages received by the control end, the first path end and the second path end meet the conducting condition of the thin film transistor, the source electrode and the drain electrode are connected through the semiconductor layer, and the thin film transistor is in an opening state at the moment.
A control terminal of the first switching thin film transistor T1 is connected to the scan line 10, a first path terminal thereof is connected to the data line 20, and a second path terminal thereof is connected to the second driving thin film transistor T2; a control end of the second driving thin film transistor T2 is connected to a second path end of the first switching thin film transistor T1, a first path end of the second driving thin film transistor T2 is connected to the first power supply, and a second path end of the second driving thin film transistor T2 is connected to the third switching thin film transistor T3; a control terminal of the third switching thin film transistor T3 is connected to the emission control driving circuit 100, a first path terminal of the third switching thin film transistor T3 is connected to a second path terminal of the second driving thin film transistor T2, and a second path terminal of the third switching thin film transistor T3 is connected to the light emitting unit 30; the storage capacitor Cst has one end connected between the second path terminal of the first switching thin film transistor T1 and the control terminal of the second driving thin film transistor T2, and the other end connected between the first path terminal of the second driving thin film transistor T2 and the first power source.
The second path terminal of the first switching thin film transistor T1, the control terminal of the second driving thin film transistor T2, and one terminal of the storage capacitor Cst are connected to a point a; the second path terminal of the second driving thin film transistor T2 and the first path terminal of the third switching thin film transistor T3 are connected to a point B, and the second path terminal of the third switching thin film transistor T3 and the light emitting unit OLED 30 are connected to a point C.
The pixel driving circuit 200 matches the control signal (emission (en) provided by the corresponding emission control driving circuit 100, as shown in fig. 3), so as to control the light emitting time of the light emitting unit 30, and drive to utilize the light emitting time difference of the light emitting unit 30, thereby adjusting the brightness and gray scale of the organic light emitting display device, and improving the image display quality.
Fig. 3 shows a timing control diagram of the first row scanning line G1 and the first column Data line Data1, a Voltage diagram of the Voltage (Pixel Voltage) at the point a, and a waveform diagram of the control signal (emission (en)).
Of course, the pixel driving circuit 200 may also have a 2T1C structure as shown in fig. 1.
Fig. 4 shows a circuit architecture of the emission control driving circuit 100 adopting 12T2C, where the emission control driving circuit 100 includes N (N > 2, and N is a positive integer) stages of emission control driving units, a control signal En-1 output by the N-1 th stage of emission control driving unit is connected to the nth stage of emission control driving unit, and N is greater than 1 and less than or equal to N. The emission control driving circuit 100 is provided with a high voltage signal VGH, a low voltage signal VGL, an empty signal CLRE, a first periodic signal CKE1, a second periodic signal CKE3, and a brightness adjusting signal PWM at its periphery, and the nth stage emission control driving unit is connected to the high voltage signal VGH, the low voltage signal VGL, the first periodic signal CKE1, the second periodic signal CKE3, the brightness adjusting signal PWM with period control, and the empty signal CLRE. The emission control driving circuit 100 may be disposed on one side or both sides of the organic light emitting display device, and when disposed on both sides, one side of the emission control driving circuit is the first periodic signal CKE1 and the second periodic signal CKE3, and the other side of the emission control driving circuit is the second periodic signal CKE2 (not shown) and the fourth periodic signal CKE4 (not shown).
In the present invention, the output of the control signal En-1 outputted by the previous stage emission control driving unit is transmitted to the next stage emission control driving unit En, and when the brightness adjusting signal PWM is inputted to the first stage emission control driving unit E1, the outputs of the emission control driving units in different rows are different by one time unit, and are sequentially transmitted, so as to drive the following pixel driving circuits 200 in different rows to be effectively and more finely controlled.
Fig. 5 is a schematic structural diagram of a first embodiment of the emission control driving circuit, in which a control signal En-1 output by an emission control driving unit of the (n-1) th stage is connected to the emission control driving unit of the nth stage. As shown in fig. 6, when n > 1, the n-th stage emission control driving unit is provided with a high voltage signal VGH, a low voltage signal VGL, a current stage periodic signal CKEn and a brightness adjusting signal PWM at its periphery, and the n-th stage trigger driving unit is connected to the control signal En-1, the high voltage signal VGH, the low voltage signal VGL, the current stage periodic signal CKEn, the brightness adjusting signal PWM with periodic control and the clear signal CLRE output by the n-1-th stage emission control driving unit; when n is 1, that is, the top emission control driving unit is connected to the luminance adjusting signal PWM, the high voltage signal VGH, the low voltage signal VGL, the present stage period signal CKEn, the luminance adjusting signal PWM with period control, and the clear signal CLRE.
The nth stage emission control driving unit adopts a circuit architecture of 12T2C, and includes an up-down pull control unit 001, an up-pull module 002, a sustain module 003, a down-pull module 004, an anti-creeping module 005, a first other module 006, a second other module 007, and a third other module 008. Wherein the pull-up and pull-down control unit 001, the pull-up module 002, the pull-down module 004 and the first other module 006 are connected to the pull-up control node netAn; the sustain module 003, the pull-down module 004 and the second other module 007 are connected to the sustain control node netBn, and the third other module 008 is connected to the output terminal of the stage emission control driving unit, the clear signal CLRE and the low voltage signal VGL. The pull-up module 002, the pull-down module 004 and the third other module 008 output the control signal En of the current stage, and the electricity leakage prevention module 005 is connected with the control signal En of the current stage.
The pull-up and pull-down control unit 001 comprises a first control switch T1 and a second control switch T2, wherein a control end of the first control switch T1 is connected with a control signal En-1 output by the n-1 th-stage emission control driving unit, a first pass end of the first control switch T1 is connected with a high-voltage signal VGH, and a second pass end of the first control switch T1 is connected with a first pass end of the second control switch T2; the control end of the second control switch T2 is connected to the current-stage periodic signal CKEn, and the second path end of the second control switch T2 is connected to the pull-up control node netAn. When n is 1, the control terminal of the first control switch T1 of the pull-up control unit 001 of the top emission control driving unit is connected to the brightness adjusting signal PWM.
The pull-up module 002 includes a tenth control switch T10 and a first capacitor C1, a control end of the tenth control switch T10 is connected to the pull-up control node netAn, a first path end of the tenth control switch T10 is connected to the high voltage signal VGH, a first plate of the first capacitor C1 is connected to the pull-up control node netAn, and a second path end of the tenth control switch T10 and a second plate of the first capacitor C1 output the present-stage control signal En.
The first control switch T1 and the second control switch T2 are respectively controlled by the brightness adjusting signal PWM and the current-stage periodic signal CKEn, so that a control-stage transmission signal is generated and the high-voltage signal VGH is driven to control the switching capability of the tenth control switch T10, and the first capacitor C1 is charged, when the voltage of the pull-up control node netAn is at a high potential, the tenth control switch T10 can be constantly turned on, the current-stage emission control driving unit outputs the high-potential control signal En, and the voltage of the pull-up control node netAn is further increased due to the effect of the first capacitor C1, so that the output voltage of the control signal En is ensured to reach the high potential and to be kept stable.
The sustain module 003 is a 3T1C structure, and includes a third control switch T3, a fourth control switch T4, a fifth control switch T5, and a second capacitor C2. A control end of the third control switch T3 and a control end of the fifth control switch T5 are both connected to a control signal En-1 output by the n-1 th-stage emission control driving unit, a first pass end of the third control switch T3 is both connected to a control end of the fourth control switch T4 and a second plate of the second capacitor C2, a second pass end of the third control switch T3 and a second pass end of the fifth control switch T5 are both connected to the low-voltage signal VGL, a first pass end of the fourth control switch T4 and a first plate of the second capacitor C2 are both connected to the current-stage periodic signal CKEn, and a second pass end of the fourth control switch T4 and a first pass end of the fifth control switch T5 are both connected to the sustain control node netBn. When n is 1, the control terminal of the third control switch T3 and the control terminal of the fifth control switch T5 of the sustain module 003 of the first-stage emission control driving unit are both connected to the luminance adjusting signal PWM.
The pull-down module 004 includes a sixth control switch T6, a seventh control switch T7 and an eighth control switch T8, a control end of the sixth control switch T6, a control end of the seventh control switch T7 and a control end of the eighth control switch T8 are all connected to the maintenance control node netBn, a first path end of the sixth control switch T6 is connected to the pull-up control node netAn, a second path end of the sixth control switch T6 is connected to the low voltage signal VGL, a first path end of the seventh control switch T7 outputs the control signal En of the current stage, a second path end of the seventh control switch T7 is connected to a first path end of the eighth control switch T8, and a second path end of the eighth control switch T8 is connected to the low voltage signal VGL.
The anti-leakage module 005 comprises a ninth control switch T9, a control terminal of the ninth control switch T9 is connected to the control signal En of the current stage, a first path terminal of the ninth control switch T9 is connected to the high voltage signal VGH, and a second path terminal of the ninth control switch T9 is connected to the first path terminal of the eighth control switch T8.
The first other module 006 includes an eleventh control switch T11, the second other module 007 includes a thirteenth control switch T13, and the third other module 008 includes a twelfth control switch T12. A control end of the eleventh control switch T11, a control end of the twelfth control switch T12, and a control end of the thirteenth control switch T13 are all connected to the clear signal CLRE, a first path end of the eleventh control switch T11 is connected to the pull-up control node netAn, a first path end of the thirteenth control switch T13 is connected to the sustain control node netBn, a first path end of the twelfth control switch T12 outputs the present-level control signal En, a second path end of the eleventh control switch T11, a second path end of the twelfth control switch T12, and a second path end of the thirteenth control switch T13 are all connected to the low-voltage signal VGL.
Since the third control switch T3 and the fifth control switch T5 are simultaneously controlled by the brightness adjustment signal PWM, so that the fourth control switch T4 is turned off during the high level period of the brightness adjustment signal PWM, and the control node netBn is maintained at the low level, the sixth control switch T6, the seventh control switch T7 and the eighth control switch T8 are turned off, so that they do not affect the potential of the control signal En of the current stage. When the input level of the brightness adjusting signal PWM becomes low, the third control switch T3 and the fifth control switch T5 of the sustain module 003 are turned off, during which the fourth control switch T4 is turned on or off by the first period signal CKE 1. When the first period signal CKE1 is at a high level, the fourth control switch T4 is turned on and charges the netBn point due to the coupling effect of the second capacitor C2; when the first periodic signal CKE1 is at a low level, the fourth control switch T4 is turned off due to the coupling effect of the second capacitor C2, so that the voltage of the control node netBn maintains a high level state, and the pull-down module 004 is driven to start to operate, and the potential of the control signal En is pulled down to a low potential.
The nth stage emission control driving unit is matched with the periodic signal CKEn, the high voltage signal VGH and the low voltage signal VGL (both the high voltage signal VGH and the low voltage signal VGL are signals of a direct current source), and is matched with the brightness adjusting signal PWM of the initial period modulation provided by the chip IC, so that the control signal En (as shown in fig. 7) required by each row of the panel can be generated, and further, the pixel light emitting time of the light emitting unit 30 is controlled, and further, the brightness change received by human eyes is controlled.
Fig. 8 is a schematic structural diagram of a second embodiment of an emission control driving circuit, which differs from the first embodiment as follows:
the pull-up and pull-down control unit 001 comprises a first control switch T1 and a second control switch T2, wherein a control end of the first control switch T1 is connected with the current-stage periodic signal CKEn, a first path end of the first control switch T1 is connected with a control signal En-1 output by the (n-1) th-stage emission control driving unit, and a second path end of the first control switch T1 is connected with a first path end of the second control switch T2; the control end of the second control switch T2 is connected to the next-stage periodic signal CKEn +1, and the second path end of the second control switch T2 is connected to the pull-up control node netAn. When n is equal to 1, the first path end of the first control switch T1 of the pull-up and pull-down control unit 001 of the first-stage emission control driving unit is connected to the brightness adjusting signal PWM.
The sustain module 003 is a 2T1C structure, which includes a fourth control switch T4, a fifth control switch T5, and a second capacitor C2. A first plate of the second capacitor C2 and a first path end of the fourth control switch T4 are both connected to the current-stage periodic signal CKEn, a control end of the fourth control switch T4 is connected to a second plate of the second capacitor C2, a second path end of the fourth control switch T4 and a first path end of the fifth control switch T5 are connected to the sustain control node netBn, a control end of the fifth control switch T5 is connected to a control signal En-1 output by the n-1 th-stage emission control driving unit, and a second path end of the fifth control switch T5 is connected to the low-voltage signal VGL. When n is 1, the control terminal of the fifth control switch T5 of the sustain module 003 of the top emission control driving unit is connected to the luminance adjusting signal PWM.
Fig. 9 is a driving waveform diagram of the emission control driving circuit shown in fig. 8, in which the first control switch T1 and the second control switch T2 are controlled by the present-stage periodic signal CKEn and the next-stage periodic signal CKEn +1, when the first control switch T1 and the second control switch T2 are simultaneously turned on, the brightness adjustment signal PWM is driven to control the switching capability of the tenth control switch TFT10, and the first capacitor C1 is charged, when the voltage of the pull-up control node an is a high potential, the tenth control switch TFT10 can be constantly turned on, the present-stage control signal En outputs a high potential, and meanwhile, due to the effect of the first capacitor C1, the voltage of the pull-up control node netAn is further increased, so that the output voltage of the present-stage control signal En is ensured to reach the high voltage and be kept stable. At this time, the fifth control switch T5 is kept open during the high level period of the adjustment signal PWM, and the voltage of the control node netBn is kept low, so the sixth control switch T6\ the seventh control switch T7 and the eighth control switch T8 are turned off, and thus the potential of the control signal En of the current stage is not affected. When the PWM input level goes low, the fourth control switch T4 is controlled by the current stage signal CKEn to turn on or off. When the current-stage periodic signal CKEn is at a high level, the fourth control switch T4 is turned on and charges the netBn point due to the coupling effect of the second capacitor C2; when the first periodic signal CKE1 is inputted with a low level, the fifth control switch T5 is turned off due to the coupling effect of the second capacitor C2, so that the voltage of the control node netBn maintains a high level state, and the pull-down unit is driven to start to operate, and the potential of the control signal En of the current stage is pulled down to a low potential.
Fig. 10 is a schematic diagram showing a structure of a third embodiment of an emission control driving circuit, which differs from the second embodiment as follows: the sustain module 003 is also in the 2T1C configuration, and the control terminal of the fifth control switch T5 is connected to the pull-up control node netAn, and the rest of the operation principles are similar and will not be described again.
Fig. 11 is a schematic structural diagram of a fourth embodiment of an emission control driving circuit, which differs from the second embodiment as follows: the control terminal of the seventh control switch T7 of the pull-down module 004 is connected to the high voltage signal VGH or the present stage periodic signal CKEn, and the operation principle is similar, which will not be described herein.
According to the emission control driving circuit and the organic light-emitting display device, the emission control driving circuit 100 provides the control signal En for the matched pixel driving circuit 200, so that the light-emitting time of the OLED pixel can be controlled, the OLED pixel can be judged as a low gray scale picture by the eyes, the uniformity of the picture is improved, the brightness and the gray scale of the organic light-emitting display device are adjusted, and the dimming function of the organic light-emitting display device is realized.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. An emission control driving circuit comprises N stages of emission control driving units, wherein control signals output by an nth-1 st stage of emission control driving unit are connected to the nth stage of emission control driving unit, N and N are positive integers, and N is more than or equal to 1 and less than or equal to N; the method is characterized in that: the emitting control driving circuit is provided with a high voltage signal, a low voltage signal, an emptying signal, a first period signal, a second period signal and a brightness adjusting signal with period control at the periphery, and the nth stage emitting control driving unit is connected with the high voltage signal, the low voltage signal, the first period signal, the second period signal, the brightness adjusting signal and the emptying signal; the nth-stage emission control driving unit comprises an up-down pulling control unit (001), a up-pulling module (002), a maintaining module (003), a down-pulling module (004), an anti-creeping module (005), a first other module (006), a second other module (007) and a third other module (008); wherein the pull-up and pull-down control unit (001), the pull-up module (002), the pull-down module (004) and the first other module (006) are connected to the pull-up control node; the sustain module (003), the pull-down module (004) and the second further module (007) are connected to a sustain control node; the pull-up module (002), the pull-down module (004) and the third other module (008) output a current-level control signal, and the electricity leakage prevention module (005) is connected with the current-level control signal.
2. The emission control drive circuit according to claim 1, characterized in that: the pull-up and pull-down control unit (001) comprises a first control switch and a second control switch, wherein a first path end of the first control switch is connected with a high-voltage signal, and a second path end of the first control switch is connected with a first path end of the second control switch; the control end of the second control switch is connected with the current-stage periodic signal, and the second path end of the second control switch is connected with the pull-up control node; when n is 1, the control end of a first control switch of a pull-up and pull-down control unit of the first-stage emission control driving unit is connected with a brightness adjusting signal; when n is more than 1, the control end of the first control switch is connected with the control signal output by the (n-1) th-stage emission control driving unit.
3. The emission control drive circuit according to claim 1, characterized in that: the pull-up and pull-down control unit (001) comprises a first control switch and a second control switch, wherein the control end of the first control switch is connected with the current-stage periodic signal, and the second path end of the first control switch is connected with the first path end of the second control switch; the control end of the second control switch is connected with the next-stage periodic signal, and the second path end of the second control switch is connected with the upper pull control node; when n is 1, a first path end of a first control switch of a pull-up and pull-down control unit of the first-stage emission control driving unit is connected with a brightness adjusting signal; when n is more than 1, the control end of the first control switch is connected with the control signal output by the (n-1) th-stage emission control driving unit.
4. The emission control drive circuit according to claim 1, characterized in that: the maintaining module (003) comprises a third control switch, a fourth control switch, a fifth control switch and a second capacitor, wherein the first path end of the third control switch is connected with the fourth control switch and the second pole plate of the second capacitor, the second path end of the third control switch and the second path end of the fifth control switch are connected with a low-voltage signal, the first path end of the fourth control switch and the first pole plate of the second capacitor are connected with a current-stage periodic signal, and the second path end of the fourth control switch and the first path end of the fifth control switch are connected with a maintaining control node; when n is 1, the control end of the third control switch and the control end of the fifth control switch of the maintaining module of the first-stage emission control driving unit are both connected with the brightness adjusting signal; when n is more than 1, the control end of the third control switch and the control end of the fifth control switch are both connected with the control signal output by the (n-1) th-stage emission control driving unit.
5. The emission control drive circuit according to claim 1, characterized in that: the maintaining module (003) comprises a fourth control switch, a fifth control switch and a second capacitor, wherein a first pole plate of the second capacitor and a first path end of the fourth control switch are both connected with the periodic signal of the current stage, a control end of the fourth control switch is connected with a second pole plate of the second capacitor, a second path end of the fourth control switch and a first path end of the fifth control switch are connected with a maintaining control node, and a second path end of the fifth control switch is both connected with a low-voltage signal; when n is 1, the control end of a fifth control switch of a maintaining module of the first-stage emission control driving unit is connected with the brightness adjusting signal; when n is more than 1, the control ends of the fifth control switches are connected with the control signals output by the (n-1) th-stage emission control driving unit.
6. The emission control drive circuit according to claim 1, characterized in that: the maintaining module (003) comprises a fourth control switch, a fifth control switch and a second capacitor, wherein a first pole plate of the second capacitor and a first path end of the fourth control switch are both connected with the periodic signal at the current stage, a control end of the fourth control switch is connected with a second pole plate of the second capacitor, a second path end of the fourth control switch and a first path end of the fifth control switch are connected with a maintaining control node, a control end of the fifth control switch T5 is connected with a pull-up control node, and a second path end of the fifth control switch is connected with a low-voltage signal.
7. The emission control drive circuit according to any one of claims 1 to 6, characterized in that: the pull-up module (002) comprises a tenth control switch and a first capacitor, a control end of the tenth control switch is connected with a pull-up control node, a first pass end of the tenth control switch is connected with a high-voltage signal, a first pole plate of the first capacitor is connected with the pull-up control node, and a second pass end of the tenth control switch and a second pole plate of the first capacitor output a control signal of the current stage.
8. The emission control drive circuit according to any one of claims 1 to 6, characterized in that: the pull-down module (004) comprises a sixth control switch, a seventh control switch and an eighth control switch, wherein a control end of the sixth control switch, a control end of the seventh control switch and a control end of the eighth control switch are all connected with a maintaining control node, a first access end of the sixth control switch is connected with an upper pull control node, a second access end of the sixth control switch is connected with a low-voltage signal, the first access end of the seventh control switch outputs a control signal of the current stage, the second access end of the seventh control switch is connected with a first access end of the eighth control switch, and the second access end of the eighth control switch is connected with the low-voltage signal.
9. The emission control drive circuit according to claim 8, characterized in that: the electricity leakage prevention module (005) comprises a ninth control switch, the control end of the ninth control switch is connected with the control signal of the current stage, the first passage end of the ninth control switch is connected with the high-voltage signal, and the second passage end of the ninth control switch is connected with the first passage end of the eighth control switch.
10. The emission control drive circuit according to any one of claims 1 to 6, characterized in that: the pull-down module (004) comprises a sixth control switch, a seventh control switch and an eighth control switch, a control end of the sixth control switch and a control end of the eighth control switch are both connected with a maintaining control node, a control end of the seventh control switch is connected with a high-voltage signal or a current-stage periodic signal, a first path end of the sixth control switch is connected with the pull-up control node, a second path end of the sixth control switch is connected with a low-voltage signal, the first path end of the seventh control switch outputs the current-stage control signal, the second path end of the seventh control switch is connected with the first path end of the eighth control switch, and the second path end of the eighth control switch is connected with the low-voltage signal.
11. The emission control drive circuit according to any one of claims 1 to 6, characterized in that: the first other module (006) comprises an eleventh control switch, the second other module (007) comprises a thirteenth control switch, the third other module (008) comprises a twelfth control switch, wherein a control end of the eleventh control switch, a control end of the twelfth control switch and a control end of the thirteenth control switch are all connected with an emptying signal, a first pass end of the eleventh control switch is connected with an upper pull control node, a first pass end of the thirteenth control switch is connected with a maintaining control node, a first pass end of the twelfth control switch outputs a current-level control signal, and a second pass end of the eleventh control switch, a second pass end of the twelfth control switch and a second pass end of the thirteenth control switch T13 are all connected with a low-voltage signal.
12. An organic light emitting display device includes criss-cross scan lines and data lines, pixel driving circuits defined at intersections of the scan lines and the data lines, light emitting units connected to the pixel driving circuits, and emission control driving circuits connected to the corresponding pixel driving circuits, wherein the light emitting units are located between a first power supply and a second power supply; characterized in that the emission control driving circuit is the emission control driving circuit of the above claims 1-11, which is located at one side or both sides of the organic light emitting display device.
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| US11967275B1 (en) | 2023-03-03 | 2024-04-23 | HKC Corporation Limited | Light-emitting drive circuit, method for timing control, and display panel |
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