CN115424585A - Pixel circuit, display panel and display device - Google Patents

Pixel circuit, display panel and display device Download PDF

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Publication number
CN115424585A
CN115424585A CN202211212908.XA CN202211212908A CN115424585A CN 115424585 A CN115424585 A CN 115424585A CN 202211212908 A CN202211212908 A CN 202211212908A CN 115424585 A CN115424585 A CN 115424585A
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China
Prior art keywords
emitting diode
light emitting
coupled
shunt element
voltage
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CN202211212908.XA
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Chinese (zh)
Inventor
袁鑫
袁海江
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HKC Co Ltd
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HKC Co Ltd
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Priority to CN202211212908.XA priority Critical patent/CN115424585A/en
Publication of CN115424585A publication Critical patent/CN115424585A/en
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application provides a pixel circuit, display panel and display device, this pixel circuit is applied to display panel, includes: a pixel driving module; a first light emitting diode; the input end of the shunt element is coupled with the output end of the pixel driving module, the output end of the shunt element is coupled with a low voltage end and is used for conducting before the gray scale to be displayed of the first light emitting diode is lower than a set threshold value so as to form parallel connection with the first light emitting diode.

Description

Pixel circuit, display panel and display device
Technical Field
The application relates to the technical field of display, in particular to a pixel circuit, a display panel and a display device.
Background
With the development of the liquid crystal Display field, the advantages of autonomous Light emission, lightness and thinness, and the like of the Organic Light Emitting Display (OLED) Display technology are gradually applied to products such as TVs, mobile phones, pen phones, and the like, because the OLED belongs to current driving, a Driver TFT and an OLED Light emitting diode are connected in series in a pixel circuit, the control of the current is realized by adjusting the turn-on size of the Driver TFT, and the Light-emitting brightness of the OLED Light emitting diode is in direct proportion to the current flowing through, therefore, the adjustment of the turn-on size of the Driver TFT can be realized, in a conventional pixel circuit, the gray scale at low brightness is difficult to expand, and at the moment, the current adjusting capability of the Driver TFT is poor, and various defects exist.
Disclosure of Invention
The application provides a pixel circuit, a display panel and a display device, aiming at solving the problem of poor current regulation capability of a Driver TFT (thin film transistor) caused by difficulty in expanding gray scales under low brightness in the example technology.
An embodiment of a first aspect of the present application provides a pixel circuit applied to a display panel, including:
the pixel driving module is used for outputting a driving signal;
a first light emitting diode, wherein a positive terminal of the first light emitting diode is coupled to an output terminal of the pixel driving module and emits light in response to the driving signal, and a negative terminal of the first light emitting diode is coupled to a low voltage terminal;
and the input end of the shunt element is coupled with the output end of the pixel driving module, the output end of the shunt element is coupled with a low-voltage end, and the shunt element is used for being conducted before the gray scale to be displayed of the first light-emitting diode is lower than a set threshold value so as to be connected with the first light-emitting diode in parallel.
In an optional embodiment, the shunt element is a non-light emitting diode, a positive terminal of the non-light emitting diode is an input terminal of the shunt element, and a negative terminal of the non-light emitting diode is an output terminal of the shunt element.
In an optional embodiment, the shunt element is a resistive element, one section of the resistive element is an input end of the shunt element, and the other end of the resistive element is an output end of the shunt element.
In an optional embodiment, the shunt element is a second light emitting diode, the second light emitting diode is located in a non-display area coverage range of the display panel, a positive terminal of the second light emitting diode is an input terminal of the shunt element, and a negative terminal of the second light emitting diode is an output terminal of the shunt element.
In an alternative embodiment, the non-light emitting diode includes:
the anode layer, the hole injection layer, the organic hole transport layer, the electron injection layer and the cathode are sequentially stacked; alternatively, the non-light emitting diode includes: the anode layer, the hole injection layer, the organic hole transport layer, the organic light-emitting layer, the electron transport layer, the electron injection layer, the cathode and the shading layer are sequentially stacked.
In an alternative embodiment, the pixel driving module includes:
a control end and an input end of the driving transistor are coupled with a driving voltage, and an output end of the driving transistor is coupled with the first light-emitting diode;
a data writing unit for writing a data voltage to the driving transistor in a writing phase; and
and one end of the storage capacitor is coupled with the control end of the driving transistor, and the other end of the storage capacitor is coupled with the output end of the driving transistor.
In an alternative embodiment, the pixel circuit further includes: the reset module is used for pulling down the voltage of one end of the storage capacitor coupled with the light-emitting diode to a reset voltage in response to the reset response voltage output by a reset response voltage line.
In an alternative embodiment, the pixel circuit further includes:
and the control end of the adjusting switch element is coupled with a preset voltage end, the first end of the adjusting switch element is coupled with the anode of the first light-emitting diode, and the second end of the adjusting switch element is coupled with the shunt element.
Embodiments of a third aspect of the present application provide a display panel including the pixel circuit as described above.
An embodiment of a fourth aspect of the present application provides a display device, including the display panel described above.
According to the technical scheme, the pixel circuit, the display panel and the display device are characterized in that the input end of the shunt element is coupled with the output end of the pixel driving module through the configuration of the shunt element, the output end of the shunt element is coupled with a low-voltage end, so that the shunt effect is achieved through electric conduction, the current from the driving transistor to the light emitting diode is reduced, the output voltage of the driving transistor is larger at lower brightness, a larger adjusting range is given, and brightness regulation and gray scale expansion are easier to perform.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a pixel circuit in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a pixel circuit in an embodiment of the present application.
FIG. 3 is a diagram illustrating driving current ranges in an exemplary technique.
Fig. 4 is a schematic diagram of the driving current range in the embodiment of the present application.
Fig. 5 is a schematic view of a layer structure of a non-light emitting diode.
Fig. 6 is a schematic structural diagram of a display device in an embodiment of the present application.
Reference numerals are as follows: 11-pixel driving module, 12-data writing unit, 13-voltage stabilizing module; t2-drive transistor, T3-voltage stabilizing transistor, T1-data writing control transistor, T6-first input control transistor, T5-second input control transistor, T4-reset transistor, cst-storage capacitor, M1-first light emitting diode; m2-shunt element;
EM 1-first transmit signal line, EM 2-second transmit signal line; int-reset signal line, gn 1-first scan line, gn 2-second scan line, VDD-driving voltage line, DATA-DATA voltage line.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The pixel circuit, the display panel, and the display device disclosed in the present application can be used in the field of display technology, and can also be used in any field other than the field of display technology.
Example 1
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure, as shown in fig. 1, applied to a display panel, including: the pixel driving module 11 is configured to output a driving signal; a first light emitting diode M1, a positive terminal of which is coupled to the output terminal of the pixel driving module and emits light in response to the driving signal, and a negative terminal of which is coupled to a low voltage terminal; and the input end of the shunt element M2 is coupled with the output end of the pixel driving module, and the output end of the shunt element M2 is coupled with a low voltage end and is used for being conducted to form parallel connection with the first light-emitting diode before the gray scale to be displayed of the first light-emitting diode is lower than a set threshold value. Since the shunt element is formed in parallel with the first light emitting diode to form a parallel connection, a shunt is formed.
The application provides a pixel circuit, through configuration shunt element M2, this shunt element M2's input is coupled the output of pixel drive module, and the output is coupled a low-voltage end to through forming the electric conduction, reach the effect of reposition of redundant personnel, and then reduced drive transistor T2 to emitting diode's electric current, thereby drive transistor T2's output voltage is bigger when lower luminance, thereby has given bigger control range, makes luminance regulation and control and grey scale launch and go on more easily.
The inventor of the present application has found that in the conventional pixel circuit, the gray scale at low luminance is difficult to spread because the Driver TFT at low luminance operates in the subthreshold region where the Driver TFT has poorer current regulation capability, and as shown in the figure, the present application shifts the adjustment that should originally be in the low luminance driving current range to the middle and high luminance driving current range by shunting by reducing shunting, so as to get rid of the subthreshold region, improve the current regulation capability of the driving transistor T2, and make the gray scale at low luminance spread more easily.
In the embodiment of the present application, the pixel circuit is applied to a display panel, the display panel includes a plurality of pixel circuits, each pixel unit includes a plurality of light emitting diodes, each of the light emitting diodes can generate red light, blue light, or green light, that is, a red sub-pixel, a green sub-pixel, and a blue sub-pixel, generally, three light emitting diodes constitute a pixel unit, the pixel unit is a minimum integrated unit constituting a pixel arrangement structure, the pixel arrangement structure constitutes a display area of the display panel, that is, the pixel arrangement includes a plurality of pixel units arranged in a specific arrangement manner, each pixel unit includes a plurality of light emitting diodes, such as a red light emitting diode, a blue light emitting diode, and a green light emitting diode, each of the light emitting diodes is electrically connected to a driving IC (integrated circuit) through an independent driving line, and the driving IC drives each of the light emitting diodes to be electrically connected to emit color light.
It can be known that, in the present application, the light emitting diodes in one pixel unit may include a red light emitting diode, a blue light emitting diode, and a green light emitting diode, and the number of the light emitting diodes may be three or four, and the present application is not limited thereto.
When the number of the leds in a pixel unit is three, the leds are typically red leds, blue leds and green leds, and when the number of the leds is four, the colors of the leds may be: red, blue, green and other colors, which may be different from each of red, blue and green, such as white, yellow or cyan. It should be noted that, if the other color is white, the display brightness of the display device where the pixel arrangement structure is located can be improved; if the other color is another color, the color gamut of the display device can be increased, which is not limited herein.
It can be understood that the light emitting diode is the first light emitting diode M1 in the embodiment of the present application, and the shunt element M2 is further included in the embodiment of the present application.
Specifically, the shunt element M2 may be a resistor, an inductor, or a light emitting diode or a non-light emitting diode, that is, the shunt element M2 needs to be an electric element first, and can perform shunt.
The shunt element M2 of the present application is explained in detail below.
In one or more embodiments of the present application, the shunt element M2 is a resistance element, one section of the resistance element is the input end of the shunt element M2, and the other end is the output end of the shunt element M2. Shunt through resistance in this embodiment, can understand that the resistance value of this embodiment equals with emitting diode's equivalent resistance value's size, perhaps according to certain multiple etc. both can realize shunting like this to can carry out the accurate control of current shunting through the resistance proportion.
In another embodiment of the present application, a diode element may also be adopted as the shunt element M2 based on process considerations, specifically, the shunt element M2 is a second light emitting diode, and the second light emitting diode is located in a coverage area of a non-display area of the display panel, a positive terminal of the second light emitting diode is an input terminal of the shunt element M2, and a negative terminal of the second light emitting diode is an output terminal of the shunt element M2.
It can be understood that, in the embodiment of the present application, by configuring the second light emitting diode in the non-display area, on one hand, shunting is possible, and the second aspect can be manufactured by the same process, so that no additional process needs to be configured.
More preferably, in one or more embodiments of the present application, the shunt element M2 is a non-light emitting diode, a positive terminal of the non-light emitting diode is an input terminal of the shunt element M2, and a negative terminal of the non-light emitting diode is an output terminal of the shunt element M2.
Specifically, for the non-light emitting diode, in the embodiment shown in fig. 5, the non-light emitting diode includes: an Anode layer (Anode), a Hole Injection Layer (HIL), an organic Hole Transport Layer (HTL), an Electron Transport Layer (ETL), an Electron Injection Layer (EIL) and a Cathode (Cathode) which are stacked in sequence. In this embodiment, an organic light emitting layer (EML) is removed, so that the organic light emitting layer does not need to be prepared only when the first light emitting diode M1 is prepared in the same layer without adding a process.
Further, in an embodiment of the present application not shown in the drawings, the non-light emitting diode includes: the organic light-emitting diode comprises an anode layer, a hole injection layer, an organic hole transport layer, an organic light-emitting layer, an electron transport layer, an electron injection layer, a cathode and a light shielding layer which are sequentially stacked. In this embodiment, by preparing the organic light emitting layer and the light shielding layer, the preparation process of the original light emitting diode can be reserved, so that the preparation process can be matched with the migration process, the light emitting diode is migrated to the display area of the display panel under the original migration process, and one light emitting diode is additionally migrated by virtue of the migration process, so that only one light shielding layer needs to be added, the migration process can be coupled, and the preparation process steps are saved.
Further, in the embodiment shown in fig. 5 of the present application, the pixel circuit further includes: and a control end of the adjusting switch element is coupled to a preset voltage end, a first end of the adjusting switch element is coupled to the anode of the first light emitting diode M1, and a second end of the adjusting switch element is coupled to the shunt element M2. According to the embodiment of the application, whether the shunt element M2 is started or not is controlled by the high-low level of the preset voltage end, so that high-brightness display is not influenced.
The pixel circuit of the present application is explained in detail below.
As shown in fig. 2, the pixel driving module 11 of the present application includes: a control end and an input end of the driving transistor T2 are coupled to a driving voltage VDD, and an output end of the driving transistor T2 is coupled to the first light emitting diode M1; a DATA writing unit 12 for writing a DATA voltage DATA to the driving transistor T2 in a writing phase; and one end of the storage capacitor is coupled to the control end of the driving transistor T2, and the other end of the storage capacitor is coupled to the output end of the driving transistor T2.
In an alternative embodiment, as shown in fig. 1, the present application further includes: the voltage regulation module 13, as shown in fig. 2, includes a voltage regulation transistor T3, a control terminal of the voltage regulation transistor T3 is coupled to the first scan line Gn1, and an input terminal and an output terminal are respectively coupled to the driving voltage VDD terminal and the control terminal of the driving transistor T2, so that the control terminal of the driving transistor T2 is coupled to the driving voltage VDD terminal.
It can be understood that, by connecting the voltage stabilizing transistor T3 to the driving voltage VDD terminal and controlling the first scan line Gn1 to be set to a high level only in the reset phase, the driving voltage VDD is written into the control terminal of the driving transistor T2, i.e., the corresponding N1 node, in the reset phase, so that the N1 node is stable in the reset phase.
Further, in a preferred embodiment, the present application configures the storage capacitor Cst as follows: as shown in fig. 2, one end of the storage capacitor Cst is coupled to the control terminal of the driving transistor T2, and the other end is coupled to the light emitting diode, the storage capacitor Cst is usually placed between VDD and the N1 node in the prior art, and the present application places Cst between the N1 and N4 nodes, and electrically connects the Cst fixed potential to the anode N4 node, so that during the light emitting period, the Vgs potential voltage of T2 is kept relatively constant, and the switching characteristic of the driving transistor is ensured.
Certainly, it can be known that, in the present application, a conventional storage capacitor Cst configuration mode may also be adopted, that is, the storage capacitor Cst is configured between the driving voltage VDD terminal and the control terminal, which is not described herein in detail, but it can be understood that, in the present application, the voltage of the N1 node can be kept stable in the light emitting stage by combining the configuration mode change of the storage capacitor Cst, and the cooperative effect is formed by the voltage stabilizing transistor T3.
When the voltage stabilizing transistor T3 is used specifically, the input end of the voltage stabilizing transistor T3 is connected with VDD, so that the voltage stabilizing transistor T3 can be conducted when a first control line outputs a high level, and therefore the N1 node is pulled high, because VDD is a positive voltage signal, the source and drain electrodes of the driving transistor T2 are positive electric signals, the voltage difference of the electric signals is reduced, the leakage current of a TFT device is further reduced, and the problem of electric leakage of the N1 node is solved.
Based on the storage capacitor Cst and the voltage stabilizing transistor T3, the control terminal (corresponding to the N1 node in fig. 2) of the driving transistor T2 and the output terminal (corresponding to the N3 node) of the driving transistor T2 are kept relatively stable.
Further, in a preferred embodiment of the present application, as shown in fig. 2, the data writing unit 12 includes: a DATA write control transistor T1, wherein a control terminal of the DATA write control transistor T1 is coupled to the second scan line Gn2, and an input terminal and an output terminal thereof are coupled to the DATA voltage DATA terminal and an output of the driving transistor T2, respectively.
Further, in an optional embodiment, in order to implement respective control of the compensation writing, light emitting, and other phases, the pixel circuit of the present application further includes: a first input control transistor T6, a control terminal of the first input control transistor T6 being coupled to the first emission signal line EM1, and an input terminal and an output terminal being coupled to the driving voltage VDD and an output terminal of the driving transistor T2, respectively, such that the input terminal of the driving transistor T2 is coupled to the driving voltage VDD.
The pixel circuit further includes: a second input control transistor T5, a control terminal of the second input control transistor T5 being coupled to the second emission signal line EM2, and an input terminal and an output terminal being coupled to the light emitting diode and the input terminal of the driving transistor T2, respectively, such that the output terminal of the driving transistor T2 is coupled to the light emitting diode.
Further, in order to reset the pixel circuit of the present application, the pixel circuit of the present application may further include a reset module, wherein the reset module pulls down a voltage of one end of the storage capacitor Cst coupled to the light emitting diode to a reset voltage in response to a reset response voltage output by a reset response voltage line.
In this embodiment, the reset response voltage line is turned on by outputting a high-level reset response voltage in the reset phase, thereby pulling down the N4 node of the storage capacitor Cst to a reset voltage.
Illustratively, the reset module includes a reset transistor T4, a control terminal of the reset transistor T4 is coupled to a reset response voltage line, and input and output terminals are coupled between the output terminal of the driving transistor T2 and a reset voltage terminal.
Further, referring to fig. 2, in an alternative embodiment, the reset response voltage line is the first scan line, that is, the first scan line Gn1 coupled to the control terminal of the voltage regulator transistor T3 is multiplexed to the reset module, so that the number of control lines is reduced.
Further, it is understood that the switching element of the present application may be a Thin-film transistor (TFT), and of course, some devices in the pixel circuit may be disposed in the non-display area of the display panel, and therefore, in some embodiments, the switching element may also be another type of transistor, which is not limited in this application.
The switching element in the present application generally includes a control terminal, an input terminal and an output terminal, and correspondingly, the control terminal is a gate of the switching element, and the input terminal and the output terminal are a source and a drain of the switching element.
The following is a detailed description of the application.
Firstly, in a reset phase: the EM1 and the EM2 are pulled down, the first input control transistor and the second input control transistor are closed, and the light emitting current of the light emitting diode is cut off; the first scanning line is pulled high, the voltage stabilizing transistor and the reset transistor are turned on, the N1 node is reset to the driving voltage VDD, and the N4 node is reset to the signal voltage of the reset signal line Vin.
Then in the compensation phase and the writing phase, the compensation + writing phase: the emission signal line is continuously low, so that the first input control transistor and the second input control transistor are kept in an off state; the first scanning line is pulled down, so that the voltage stabilizing transistor and the reset transistor are closed; the second scan line is pulled high, the DATA is written into the control transistor, the second DATA writing control transistor T4 is turned on, the DATA voltage DATA is written into N2, and since the driving transistor is turned on by the driving voltage VDD written into N1 in the previous period, the DATA voltage DATA is inversely written into the N1 node through the driving transistor and the second DATA writing control transistor T4 until the driving transistor is turned off.
And finally, in a light emitting stage, the first scanning line and the second scanning line are switched to low potential, the data writing control transistor and the voltage stabilizing transistor are closed, the second data writing control transistor T4, the transistor device is reset, the N1 node potential keeps to enable the driving transistor to be kept on, the emission signal line is pulled high to enable the first input control transistor and the second input control transistor to be opened, the driving voltage VDD passes through the first input control transistor, the driving transistor and the second input control transistor, the current of the transistor device enters the anode of the light emitting diode, holes are provided for the OLED light emitting device, and the OLED light emitting device emits light in a composite mode with electrons transmitted by the cathode.
In the embodiment of the present application, since the shunt element is configured, the input end of the shunt element is coupled to the output end of the pixel driving module, and the output end of the shunt element is coupled to a low voltage end, so as to achieve the effect of shunting by forming electrical conduction, thereby reducing the current from the driving transistor to the light emitting diode, and thus the output voltage of the driving transistor is larger at a lower brightness, thereby providing a larger adjustment range, and making brightness regulation and gray scale expansion easier to perform.
Further, in the embodiment of the present invention, at a high temperature, since the leakage current of the panel is increased, the current of the panel may flow back to the driving voltage VDD, and further the current stability provided by the driving voltage VDD is affected.
It is obvious to one skilled in the art that "coupling" in the present application may be a direct or indirect electrical connection, for example, a and B are coupled, and then a and B are directly electrically connected, or a and B are electrically connected through C, which is not limited in the present application.
Example 2
The present application further provides a display panel, which includes a plurality of pixel circuits, each pixel circuit including a pixel driving module for outputting a driving signal; a first light emitting diode, wherein a positive terminal of the first light emitting diode is coupled to an output terminal of the pixel driving module and emits light in response to the driving signal, and a negative terminal of the first light emitting diode is coupled to a low voltage terminal; and the input end of the shunt element is coupled with the output end of the pixel driving module, and the output end of the shunt element is coupled with a low voltage end and is used for being conducted before the gray scale to be displayed of the first light-emitting diode is lower than a set threshold value so as to form parallel connection with the first light-emitting diode.
It can be understood that, in the display device of the present application, by configuring the shunt element, the input terminal of the shunt element is coupled to the output terminal of the pixel driving module, and the output terminal is coupled to a low voltage terminal, so as to achieve the effect of shunting by forming electrical conduction, thereby reducing the current from the driving transistor to the light emitting diode, so that the output voltage of the driving transistor is larger at a lower brightness, thereby providing a larger adjustment range, and making brightness control and gray scale expansion easier.
Example 3
As shown in fig. 5, a display device 20 in the embodiment of the present application includes a display panel including a plurality of pixel circuits, each pixel unit includes a plurality of light emitting diodes 23, and the pixel circuit 22 in embodiment 1, and each light emitting diode 23 is coupled to the pixel circuit in embodiment 1 of the present application through a wire 21.
In specific implementation, the display device provided in the embodiment of the present invention may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator.
It can be understood that, the display device in the present application is configured with a shunt element, the input terminal of the shunt element is coupled to the output terminal of the pixel driving module, and the output terminal of the shunt element is coupled to a low voltage terminal, so that the shunt effect is achieved by forming electrical conduction, and further the current from the driving transistor to the light emitting diode is reduced, so that the output voltage of the driving transistor is larger at a lower brightness, and a larger adjustment range is given, so that the brightness adjustment and the gray scale deployment are easier to perform.
It should be noted that, the driving circuit embodiment, the display device embodiment, the driving method thereof, and the debugging method provided in the embodiments of the present invention may all be mutually referred to, and the embodiments of the present invention do not limit this. The steps of the method for manufacturing a display panel provided in the embodiments of the present invention can be increased or decreased according to the circumstances, and any method that can be easily conceived by a person skilled in the art within the technical scope of the present disclosure shall be covered within the protection scope of the present disclosure, and therefore, the details thereof are not repeated.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A pixel circuit applied to a display panel, comprising:
the pixel driving module is used for outputting a driving signal;
a first light emitting diode, wherein a positive terminal of the first light emitting diode is coupled to an output terminal of the pixel driving module and emits light in response to the driving signal, and a negative terminal of the first light emitting diode is coupled to a low voltage terminal;
and the input end of the shunt element is coupled with the output end of the pixel driving module, the output end of the shunt element is coupled with a low-voltage end, and the shunt element is used for being conducted before the gray scale to be displayed of the first light-emitting diode is lower than a set threshold value so as to be connected with the first light-emitting diode in parallel.
2. The pixel circuit according to claim 1, wherein the shunt element is a non-light emitting diode, a positive terminal of the non-light emitting diode is an input terminal of the shunt element, and a negative terminal of the non-light emitting diode is an output terminal of the shunt element.
3. The pixel circuit according to claim 2, wherein the non-light emitting diode comprises:
the anode layer, the hole injection layer, the organic hole transport layer, the electron injection layer and the cathode are sequentially stacked; alternatively, the non-light emitting diode includes: the anode layer, the hole injection layer, the organic hole transport layer, the organic light-emitting layer, the electron transport layer, the electron injection layer, the cathode and the shading layer are sequentially stacked.
4. The pixel circuit according to claim 1, wherein the shunt element is a resistive element, one segment of the resistive element being an input terminal of the shunt element, the other end being an output terminal of the shunt element.
5. The pixel circuit according to claim 1, wherein the shunt element is a second light emitting diode, and the second light emitting diode is within a non-display area coverage of the display panel, and a positive terminal of the second light emitting diode is an input terminal of the shunt element, and a negative terminal of the second light emitting diode is an output terminal of the shunt element.
6. The pixel circuit according to claim 1, wherein the pixel driving module comprises:
a control end and an input end of the driving transistor are coupled with a driving voltage, and an output end of the driving transistor is coupled with the first light-emitting diode;
a data writing unit for writing a data voltage to the driving transistor in a writing phase; and
and one end of the storage capacitor is coupled with the control end of the driving transistor, and the other end of the storage capacitor is coupled with the output end of the driving transistor.
7. The pixel circuit according to claim 6, further comprising: the reset module is used for responding to a reset response voltage output by a reset response voltage line and pulling down the voltage of one end of the storage capacitor coupled with the first light-emitting diode to a reset voltage.
8. The pixel circuit according to claims 1-7, further comprising:
and the control end of the adjusting switch element is coupled with a preset voltage end, the first end of the adjusting switch element is coupled with the anode of the first light-emitting diode, and the second end of the adjusting switch element is coupled with the shunt element.
9. A display panel comprising the pixel circuit according to any one of claims 1 to 8.
10. A display device characterized by comprising the display panel according to claim 9.
CN202211212908.XA 2022-09-30 2022-09-30 Pixel circuit, display panel and display device Pending CN115424585A (en)

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106409233A (en) * 2016-11-28 2017-02-15 上海天马有机发光显示技术有限公司 Pixel circuit and driving method thereof and organic light-emitting display panel
CN106997747A (en) * 2017-05-27 2017-08-01 京东方科技集团股份有限公司 A kind of organic electroluminescence display panel and display device
CN111462680A (en) * 2020-04-22 2020-07-28 昆山国显光电有限公司 Pixel circuit, driving method thereof, display panel and display device
CN112233620A (en) * 2020-10-21 2021-01-15 京东方科技集团股份有限公司 Display substrate, driving method thereof and display device
CN114842802A (en) * 2022-06-28 2022-08-02 惠科股份有限公司 Pixel driving circuit, display panel and display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106409233A (en) * 2016-11-28 2017-02-15 上海天马有机发光显示技术有限公司 Pixel circuit and driving method thereof and organic light-emitting display panel
CN106997747A (en) * 2017-05-27 2017-08-01 京东方科技集团股份有限公司 A kind of organic electroluminescence display panel and display device
CN111462680A (en) * 2020-04-22 2020-07-28 昆山国显光电有限公司 Pixel circuit, driving method thereof, display panel and display device
CN112233620A (en) * 2020-10-21 2021-01-15 京东方科技集团股份有限公司 Display substrate, driving method thereof and display device
CN114842802A (en) * 2022-06-28 2022-08-02 惠科股份有限公司 Pixel driving circuit, display panel and display device

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