CN112863449B - Light-emitting control circuit, driving method thereof, display panel and display device - Google Patents
Light-emitting control circuit, driving method thereof, display panel and display device Download PDFInfo
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- 230000008878 coupling Effects 0.000 claims description 6
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- 102100040862 Dual specificity protein kinase CLK1 Human genes 0.000 description 6
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- 101000749294 Homo sapiens Dual specificity protein kinase CLK1 Proteins 0.000 description 6
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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]
- G09G3/3266—Details of drivers for scan electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a light-emitting control circuit, a driving method thereof, a display panel and a display device, wherein the light-emitting control circuit comprises: the output end of each GOA unit is electrically connected with one light-emitting control signal line, and each GOA unit is used for outputting a first signal to the corresponding light-emitting control signal line; and the dimming units are in one-to-one correspondence with the multistage cascaded GOA units, and one dimming unit is electrically connected with the output end of the first-stage GOA unit and is used for dividing the jump stage of the first signal into a plurality of sub jump stages with gradually changed amplitudes.
Description
Technical Field
The invention relates to the technical field of display, in particular to a light-emitting control circuit, a driving method thereof, a display panel and a display device.
Background
In the field of Display technology, both Thin film Transistor Liquid Crystal Display (TET-LCD) panels and Organic Light Emitting Display (OLED) panels require control of a driving Circuit (IC), and the driving IC controls the Display panel to implement the functions of progressive scanning and frame-by-frame refreshing, so that image data input to the Display panel can be refreshed in real time, thereby implementing dynamic Display.
In order to control the pixels in the OLED display panel, besides a SCAN Gate Driver on Array (SCAN GOA) circuit corresponding to a common SCAN line, an EM GOA circuit is also required to be provided, and the EM GOA circuit is used to control the pixels in the corresponding row to emit light in the light Emitting stage.
In the prior art, the OLED display panel generally adjusts the screen brightness through a Pulse Width Modulation (PWM) dimming manner under a low brightness condition (brightness < 90nit), but the adjusting manner has a serious screen flicker when the brightness is changed between on and off, thereby resulting in a poor display effect.
Disclosure of Invention
Embodiments of the present invention provide a light emitting control circuit, a driving method thereof, a display panel and a display device, so as to solve the above problems in the prior art.
In a first aspect, to solve the above technical problem, an embodiment of the present invention provides a light emitting control circuit, including:
the output end of each GOA unit is electrically connected with one light-emitting control signal line, and each GOA unit is used for outputting a first signal to the corresponding light-emitting control signal line;
and the dimming units are in one-to-one correspondence with the multistage cascaded GOA units, and one dimming unit is electrically connected with the output end of the first-stage GOA unit and is used for dividing the jump stage of the first signal into a plurality of sub jump stages with gradually changed amplitudes.
A possible embodiment, the dimming unit comprises at least one sub-dimming unit, the sub-dimming unit is used for coupling a second signal with a duty cycle smaller than the first signal to the first signal, and a part of a first level of the second signal is coupled with a level corresponding to a transition phase of the first signal, and a second level of the first signal is coupled with a level corresponding to a transition phase of the second signal; wherein the transition phase comprises a transition from a first level to a second level and a transition from the second level to the first level.
In a possible implementation manner, in the time domain, a time interval between two adjacent rising edge signals and a time interval between two adjacent falling edge signals in the first signal and the second signal are a preset time interval, and the preset time interval is smaller than a duration of holding a valid signal of the first signal and is greater than or equal to a line scanning time.
In one possible embodiment, the sub-dimming unit includes: a thin film transistor and a capacitor;
a first electrode of the thin film transistor is electrically connected with one end of the capacitor and an output end of the corresponding GOA unit respectively, a second electrode of the thin film transistor is electrically connected with a supply end of the second signal, and a grid electrode of the thin film transistor is electrically connected with a clock signal control end;
the other end of the capacitor is grounded.
In one possible embodiment, the dimming unit includes a plurality of sub-dimming units, the duty ratios of a plurality of second signals corresponding to the plurality of sub-dimming units are gradually decreased, and the pulse widths of the plurality of second signals are sequentially coupled with the first signal according to the order of the duty ratios from large to small.
In one possible embodiment, the amplitudes of the plurality of second signals are the same as the amplitudes of the first signals, and the period occupied by the second level of the second signal having a large duty ratio completely includes the period occupied by the second level of the second signal having a small duty ratio.
In a possible embodiment, a central time point of the second level occupying period of the first signal is the same as a central time point of the second level occupying period of each of the second signals in the time domain.
In one possible embodiment, the gates of all the tfts are electrically connected to the same clock signal control terminal.
In a second aspect, an embodiment of the present invention provides a driving method of the light emission control circuit according to the first aspect, including:
in a frame scanning period, sending an initial signal to a plurality of levels of cascaded GOA units, and enabling each level of GOA units to sequentially output a first signal to a corresponding light-emitting control signal line;
and controlling the dimming unit to couple the second signal to the first signal output by the corresponding GOA unit, so that the transition stage of the first signal is divided into a plurality of sub-transition stages with gradually changed amplitudes.
One possible implementation manner, controlling the dimming unit to couple the second signal to the first signal output by the corresponding grade of the GOA unit, includes:
for a current dimming unit corresponding to a current-level GOA unit currently outputting a second level of the first signal, performing the following operations:
after the previous-stage GOA unit receives the signal of the previous-stage GOA unit and before the previous-stage GOA unit outputs the first signal, a control signal for controlling the current dimming unit to couple the second signal to the first signal is sent, so that the jump stage of the first signal is divided into a plurality of sub jump stages with gradually changed amplitudes.
In a third aspect, an embodiment of the present invention provides a display panel, including:
a plurality of rows of pixel circuits, and a light emission control signal line electrically connected to the plurality of rows of pixel circuits, a light emission driving circuit electrically connected to the light emission control signal line, the light emission driving circuit being the light emission control circuit according to the first aspect.
In a fourth aspect, an embodiment of the present invention provides a display device, including the display panel according to the third aspect.
Drawings
Fig. 1 is a schematic structural diagram of a light-emitting control circuit according to an embodiment of the present invention;
FIG. 2 is a timing diagram of a first signal output by a GOA unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dimming unit formed by two sub-dimming units according to an embodiment of the present invention;
FIG. 4 is a first timing diagram illustrating the coupling of the second signal to the first signal according to one embodiment of the present invention;
FIG. 5 is a second timing diagram illustrating the coupling of the second signal to the first signal according to one embodiment of the present invention;
fig. 6 is a schematic diagram of a sub-dimming unit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a dimming unit according to an embodiment of the present invention;
fig. 8 is a timing control diagram of the dimming control unit according to an embodiment of the present invention;
fig. 9 is a flowchart of a driving method of a light emitting control circuit according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention provide a light emitting control circuit, a driving method thereof, a display panel and a display device, so as to solve the above problems in the prior art.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
It should be noted that in the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
The following describes a light emission control circuit, a driving method thereof, a display panel, and a display device according to embodiments of the present invention with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a light-emitting control circuit according to an embodiment of the present invention, and fig. 2 is a timing diagram of a first signal output by a GOA unit according to an embodiment of the present invention.
In the multiple cascaded GOA units 1, an output end 11 of each GOA unit 1 is electrically connected to one light emission control signal line, and each GOA unit is configured to output a first signal to a corresponding light emission control signal line.
The multiple dimming units 2 are in one-to-one correspondence with the multiple cascaded GOA units 1, and one dimming unit 2 is electrically connected with the output end 11 of one-level GOA unit 1 and used for dividing a jump stage of a first signal into multiple sub jump stages with gradually changing amplitudes.
And the transition stage of the first signal comprises a transition stage corresponding to a rising edge and a transition stage corresponding to a falling edge of the first signal.
In fig. 1 and 2, for convenience of understanding, a first signal obtained by dividing a transition stage into a plurality of sub-transition stages is referred to as Out, a first signal obtained by dividing the transition stage into a plurality of sub-transition stages is referred to as Out1, a signal received by a first-stage GOA unit is an initial signal (referred to as ESTV), a first signal (Out) output by the GOA unit is an input signal of a next-stage GOA unit, and the first signal (Out) is processed by a corresponding dimming unit to obtain a first signal (Out1) having a plurality of sub-transition stages with gradually changing amplitudes; the input signal of the second-level GOA unit is a first signal output by the first-level GOA unit, a first signal (Out) output by the second-level GOA unit is an input signal of the third-level GOA unit, and the first signal (Out) is processed by the dimming unit to obtain a first signal (Out1) with a plurality of amplitude-gradient sub-jump stages; and the other levels of the GOA units are analogized in sequence.
In the embodiment provided by the invention, the output end of each grade of the GOA unit 1 is electrically connected with one dimming unit 2, and the jump stage of the first signal output by the corresponding grade of the GOA unit 1 is divided into a plurality of sub-jump stages with gradually changed amplitudes, so that the voltage of the first signal is gradually transited, and further screen flicker is reduced and the display effect is improved.
Referring to fig. 3 to 5, fig. 3 is a schematic structural diagram illustrating a dimming unit formed by two sub-dimming units according to an embodiment of the present invention, fig. 4 is a timing diagram of a first signal coupled by a second signal according to an embodiment of the present invention, and fig. 5 is a timing diagram of a second signal coupled by a first signal according to an embodiment of the present invention.
The dimming unit 2 comprises at least one sub-dimming unit 21, wherein the sub-dimming unit 21 is configured to couple a second signal with a duty cycle smaller than that of the first signal to the first signal, and a part of a first level of the second signal is coupled to a level corresponding to a transition stage of the first signal, and a second level of the first signal is coupled to a level corresponding to a transition stage of the second signal; wherein the transition phase comprises a transition from a first level to a second level and a transition from the second level to the first level.
The dimming unit 2 may be composed of 1 sub-dimming unit 21, or 2 sub-dimming units (as shown in fig. 3), or even more sub-dimming units 21, and the output end of the sub-dimming unit 21 is electrically connected to the output end 11 of the corresponding grade GOA unit 1.
When the dimming unit 2 is composed of one sub-dimming unit 21, the sub-dimming unit 21 couples a second signal (V1) with a duty ratio smaller than the first signal (Out) to the first signal, as shown in fig. 4, in a transition stage corresponding to a rising edge of the first signal, a part of the first level is coupled to the second level of the first signal in a transition stage corresponding to a rising edge of the second signal (V1), so as to obtain a third level between the first level and the second level, so that the transition stage corresponding to the rising edge of the first signal is divided into two sub-transition stages with gradually changing amplitudes, and the coupling manner between the transition stage corresponding to the falling edge of the first signal and the transition stage of the falling edge of the second signal is similar to this, and is not described in detail.
When the dimming unit 2 is composed of two sub-dimming units 21, the two sub-dimming units 21 each output a second signal coupled to the first signal, and the duty ratios of the two second signals are different and smaller than the duty ratio of the first signal, as shown in fig. 5, in a transition stage corresponding to a rising edge of the first signal, a part of the first level in a transition stage corresponding to a rising edge of the two second signals (V1 and V2) is coupled to the second level of the first signal, so as to obtain a third level and a fourth level between the first level and the second level, so that the transition stage corresponding to the rising edge of the first signal is divided into three sub-transition stages with gradually changing amplitudes, and the coupling manner of the transition stage corresponding to the falling edge of the first signal and the transition stage of the falling edge of the two second signals is similar thereto, and is not described again.
Referring to fig. 4, in the time domain, a time interval (t1) between two adjacent rising edge signals and a time interval (t2) between two adjacent falling edge signals in the first signal and the second signal are preset time intervals, the preset time intervals are smaller than a duration of holding the valid signal of the first signal and are greater than or equal to the line scanning time, and if the valid signal of the first signal is at the second level, a duration of holding the second level is a duration of holding the valid signal of the first signal in one period.
Referring to fig. 6, which is a schematic diagram of a sub-dimming unit according to an embodiment of the present invention, the sub-dimming unit 21 includes: a thin film transistor T and a capacitor C.
A first pole of the thin film transistor T is electrically connected to one end of the capacitor C and the output end of the corresponding GOA unit 1, a second pole of the thin film transistor T is electrically connected to a supply end (not shown) of the second signal (V1), and a gate of the thin film transistor T is electrically connected to a clock signal control end (not shown, corresponding to the output signal CLK 1). The thin film transistor may be a P-type thin film transistor (PMOS) or an N-type thin film transistor (NMOS). When the thin film transistor is an NMOS, the first electrode is a source electrode, and the second electrode is a drain electrode; when the thin film transistor is a PMOS, the first electrode is a drain electrode, and the second electrode is a source electrode.
The other end of the capacitor is Grounded (GND).
The thin film transistor T is controlled to be turned on by the CLK1, the second signal V1 is transmitted from the second pole to the first pole of the thin film transistor T, the second signal V1 is coupled to the first signal Out, the transition stage of the first signal is divided into a plurality of sub-transition stages with gradually changed amplitudes, and finally the first signal Out1 is output to the light-emitting signal control line.
Referring to fig. 7 and 8, fig. 7 is a schematic diagram of a dimming unit according to an embodiment of the present invention, and fig. 8 is a timing control diagram of a dimming control unit according to an embodiment of the present invention.
The dimming unit 2 includes a plurality of sub-dimming units 21, the duty ratios of a plurality of second signals corresponding to the plurality of sub-dimming units 21 are gradually decreased, and the pulse widths of the plurality of second signals are sequentially coupled to the first signal in the order of decreasing the duty ratios.
Fig. 7 illustrates an example of the dimming cell 2 including 2 sub-dimming cells 21, where the first sub-dimming cell 21 includes a thin film transistor T1 and a capacitor C1, and the corresponding second signal is V1; the second sub dimming cell 21 includes a thin film transistor T2 and a capacitor C2, and the corresponding second signal is V2. The duty ratios of V1 and V2 are both smaller than the duty ratio of the first signal (Out), V1 is smaller than the duty ratio of V2, or V2 is smaller than the duty ratio of V1, the effective part of the second signal with larger duty ratio is coupled with the first signal first, as shown in fig. 8, it is assumed that V2 is smaller than the duty ratio of V1, T1 and T2 are P-type thin film transistors, and the corresponding control signals are active low, i.e. CLK1 and CLK2 open T1 and T2 when CLK1 and CLK2 are low in fig. 8, and the second level (effective part) of V1 is coupled with the first signal first by letting V1 and V2 couple with the second level (effective part) of the first signal. The time intervals t3, t1, CLK2 between the falling edge of CLK1, CLK2 and the rising edge of the first signal, and t4 between the falling edge of CLK1 and the rising edge of the first signal are 1 line scan time.
It should be noted that, in practical applications, the dimming unit may further include more sub-dimming units 21; the active periods corresponding to CLK1, CLK2 (a period corresponding to a low level in fig. 8) may be the same, or an active period corresponding to CLK2 is included in an active period of CLK 1.
In the embodiment provided by the invention, the amplitudes of the plurality of second signals are the same as the amplitude of the first signal, and the period occupied by the second level of the second signal with the large duty ratio completely contains the period occupied by the second level of the second signal with the small duty ratio.
By completely containing the time period occupied by the second level of the second signal with large duty ratio and the time period occupied by the second level of the second signal with small duty ratio, after the second signals are coupled to the first signal, the jump stage of the first signal can be divided into a plurality of sub-jump stages with gradually changed amplitudes, so that the voltage of the first signal can be gradually transited during jumping, and further, the screen flicker is prevented.
In an embodiment provided by the present invention, a center time point of the second level occupying period of the first signal is the same as a center time point of the second level occupying period of each of the second signals in the time domain.
In the time domain, the second level of the first signal occupies the same central time point of the time period as the second level of each second signal, so that the jump stage corresponding to the rising edge and the jump stage corresponding to the falling edge of the first signal are symmetrical about the central time point, and the smooth transition of the two jump stages is facilitated.
In the embodiment provided by the invention, the gates of all the thin film transistors are electrically connected with the same clock signal control terminal. Namely, the gates of all the thin film transistors can be controlled by the same signal, so that the wiring can be saved, and the occupied wiring space can be reduced.
Based on the same inventive concept, an embodiment of the present invention provides a method for driving the light-emitting control circuit, where for a specific structure of the light-emitting control circuit, reference is made to the previous description, which is not repeated herein, and reference is made to fig. 9, where the method includes:
step 901: in a frame scanning period, an initial signal is sent to multiple cascaded GOA units, so that each GOA unit sequentially outputs a first signal to a corresponding light-emitting control signal line.
Step 902: and controlling the dimming unit to couple the second signal to the first signal output by the corresponding GOA unit, so that the jump stage of the first signal is divided into a plurality of sub-jump stages with gradually changed amplitudes.
One possible implementation manner, controlling the dimming unit to couple the second signal to the first signal output by the corresponding grade of the GOA unit, includes:
aiming at a current dimming unit corresponding to a current-level GOA unit which currently outputs a second level of a first signal, the following operations are executed:
after the previous-stage GOA unit receives the signal of the previous-stage GOA unit and before the previous-stage GOA unit outputs the first signal, a control signal for controlling the current dimming unit to couple the second signal to the first signal is sent, so that the jump stage of the first signal is divided into a plurality of sub jump stages with gradually changed amplitudes.
Based on the same inventive concept, an embodiment of the present invention provides a display panel, including:
the pixel circuit comprises a plurality of rows of pixel circuits, light-emitting control signal wires electrically connected with the plurality of rows of pixel circuits, and a light-emitting drive circuit electrically connected with the light-emitting control signal wires, wherein the light-emitting drive circuit is the light-emitting control circuit.
Based on the same inventive concept, an embodiment of the present invention provides a display device, including: a display panel as described above.
The display device can be a liquid crystal display, a liquid crystal display screen, a liquid crystal television and other display devices, and can also be mobile equipment such as a mobile phone, a tablet personal computer, a notebook computer and the like.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A light emission control circuit applied to an OLED display panel, comprising:
the output end of each GOA unit is electrically connected with one light-emitting control signal line, and each GOA unit is used for outputting a first signal to the corresponding light-emitting control signal line;
the multiple dimming units are in one-to-one correspondence with the multiple cascaded GOA units, and one dimming unit is electrically connected with the output end of the first-stage GOA unit and is used for dividing the jump stage of the first signal into multiple sub-jump stages with gradually changed amplitudes;
the dimming unit comprises at least one sub-dimming unit, the sub-dimming unit is used for coupling a second signal with a duty ratio smaller than that of the first signal to the first signal, part of a first level of the second signal is coupled with a level corresponding to a transition stage of the first signal, and a second level of the first signal is coupled with a level corresponding to a transition stage of the second signal; wherein the transition phase comprises a transition from a first level to a second level and a transition from the second level to the first level.
2. The light emission control circuit according to claim 1, wherein, in a time domain, a time interval between two adjacent rising edge signals and a time interval between two adjacent falling edge signals in the first signal and the second signal are a preset time interval which is smaller than a duration in which an effective signal of the first signal is held and is greater than or equal to a row scan time.
3. The lighting control circuit of claim 1, wherein the sub-dimming cell comprises: a thin film transistor and a capacitor;
a first electrode of the thin film transistor is electrically connected with one end of the capacitor and an output end of the corresponding GOA unit respectively, a second electrode of the thin film transistor is electrically connected with a supply end of the second signal, and a grid electrode of the thin film transistor is electrically connected with a clock signal control end;
the other end of the capacitor is grounded.
4. The lighting control circuit of claim 1, wherein the dimming unit comprises a plurality of sub-dimming units, the duty ratios of the plurality of second signals corresponding to the plurality of sub-dimming units are gradually decreased, and the pulse widths of the plurality of second signals are sequentially coupled to the first signal in the order from the larger duty ratio to the smaller duty ratio.
5. The light emission control circuit according to claim 4, wherein the amplitudes of the plurality of second signals are the same as the amplitude of the first signal, and wherein a period occupied by the second level of the second signal whose duty ratio is large completely contains a period occupied by the second level of the second signal whose duty ratio is small.
6. The light emission control circuit according to claim 5, wherein a center time point of the second level occupying period of the first signal is the same as a center time point of the second level occupying period of each of the second signals in a time domain.
7. The light emission control circuit according to claim 3, wherein the gates of all the thin film transistors are electrically connected to the same clock signal control terminal.
8. A driving method of the light emission control circuit according to any one of claims 1 to 7, comprising:
in a frame scanning period, sending an initial signal to a plurality of levels of cascaded GOA units, and enabling each level of GOA units to sequentially output a first signal to a corresponding light-emitting control signal line;
and controlling the dimming unit to couple the second signal to the first signal output by the corresponding GOA unit, so that the transition stage of the first signal is divided into a plurality of sub-transition stages with gradually changed amplitudes.
9. The driving method as claimed in claim 8, wherein controlling the dimming cell to couple the second signal to the first signal output by the corresponding stage of the GOA cell comprises:
aiming at a current dimming unit corresponding to a current-level GOA unit which currently outputs a second level of a first signal, the following operations are executed:
after the previous-stage GOA unit receives the signal of the previous-stage GOA unit and before the previous-stage GOA unit outputs the first signal, a control signal for controlling the current dimming unit to couple the second signal to the first signal is sent, so that the jump stage of the first signal is divided into a plurality of sub jump stages with gradually changed amplitudes.
10. A display panel, comprising:
a plurality of rows of pixel circuits, and a light emission control signal line electrically connected to the plurality of rows of pixel circuits, a light emission driving circuit electrically connected to the light emission control signal line, the light emission driving circuit being the light emission control circuit according to any one of claims 1 to 7.
11. A display device characterized by comprising the display panel according to claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110033545.2A CN112863449B (en) | 2021-01-12 | 2021-01-12 | Light-emitting control circuit, driving method thereof, display panel and display device |
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| CN202110033545.2A CN112863449B (en) | 2021-01-12 | 2021-01-12 | Light-emitting control circuit, driving method thereof, display panel and display device |
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| CN106782324A (en) * | 2017-02-17 | 2017-05-31 | 京东方科技集团股份有限公司 | Image element circuit and its driving method, display device |
| CN107342038A (en) * | 2017-09-13 | 2017-11-10 | 京东方科技集团股份有限公司 | A kind of shift register, its driving method, gate driving circuit and display device |
| CN110767194A (en) * | 2019-11-11 | 2020-02-07 | 京东方科技集团股份有限公司 | Shifting register unit, grid driving circuit and display panel |
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| JP2008170687A (en) * | 2007-01-11 | 2008-07-24 | Sony Corp | Liquid crystal display device, driving method for liquid crystal display device, and electronic equipment |
| CN101763900A (en) * | 2010-01-18 | 2010-06-30 | 友达光电股份有限公司 | Shift register circuit |
| CN106057116B (en) * | 2016-06-20 | 2019-04-05 | 京东方科技集团股份有限公司 | Shift register cell, driving method, gate driving circuit and display device |
| US10902793B2 (en) * | 2018-09-12 | 2021-01-26 | Lg Display Co., Ltd. | Gate driver circuit outputting a plurality of emission signals having different delay times or pulse widths or combinations thereof |
| KR102472193B1 (en) * | 2018-11-20 | 2022-11-28 | 엘지디스플레이 주식회사 | Data drivign circuit, display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106782324A (en) * | 2017-02-17 | 2017-05-31 | 京东方科技集团股份有限公司 | Image element circuit and its driving method, display device |
| CN107342038A (en) * | 2017-09-13 | 2017-11-10 | 京东方科技集团股份有限公司 | A kind of shift register, its driving method, gate driving circuit and display device |
| CN110767194A (en) * | 2019-11-11 | 2020-02-07 | 京东方科技集团股份有限公司 | Shifting register unit, grid driving circuit and display panel |
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