CN115547257A - Display panel and display device - Google Patents
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- CN115547257A CN115547257A CN202211274871.3A CN202211274871A CN115547257A CN 115547257 A CN115547257 A CN 115547257A CN 202211274871 A CN202211274871 A CN 202211274871A CN 115547257 A CN115547257 A CN 115547257A
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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
- 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]
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- G—PHYSICS
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- 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
- G09G2320/0257—Reduction of after-image effects
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
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- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a display panel and a display device, comprising a plurality of pixel circuits which are arranged in an array; the pixel circuit comprises a data writing module, a driving transistor, a bias adjusting module and a light-emitting element; in the same pixel circuit, the data writing module is used for writing a data signal into the grid electrode of the driving transistor; the driving transistor is used for providing a driving current for the light-emitting element according to a data signal; the bias adjusting module is respectively electrically connected with the first pole of the driving transistor, the second pole of the driving transistor and the data writing module, and is used for storing a data signal provided by the data writing module to the grid electrode of the driving transistor and providing electric charges to the first pole and the second pole of the driving transistor according to the data signal. The technical scheme of the invention can solve the problems of too low display brightness and even smear when the display panel switches black and white pictures in the prior art, and improve the display quality.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
With the development of display technology, people have higher and higher requirements on display quality. In the prior art, a driving transistor in a pixel circuit usually has a hysteresis effect, so that when a panel is switched between a black picture and a white picture, the display brightness is too low, even a smear occurs, and the display quality of the display device is reduced.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for solving the problems that in the prior art, when a display panel is switched between a black picture and a white picture, the display brightness is too low, and even a smear occurs, and the display quality is improved.
In a first aspect, an embodiment of the present invention provides a display panel, including: a plurality of pixel circuits arranged in an array;
the pixel circuit comprises a data writing module, a driving transistor, a bias adjusting module and a light-emitting element;
in the same pixel circuit, the data writing module is used for writing a data signal into the grid electrode of the driving transistor; the driving transistor is used for providing driving current for the light-emitting element according to the data signal; the bias adjusting module is electrically connected with the first pole of the driving transistor, the second pole of the driving transistor and the data writing module respectively, and the bias adjusting module is used for storing a data signal provided by the data writing module to the gate of the driving transistor and providing charges to the first pole and the second pole of the driving transistor according to the data signal.
In a second aspect, embodiments of the present invention further provide a display device, including the display device according to the first aspect.
According to the technical scheme, the bias adjusting module electrically connected with the first pole of the driving transistor, the second pole of the driving transistor and the data writing module is arranged, so that the bias adjusting module can store data signals provided by the data writing module to the grid electrode of the driving transistor and provide charges to the first pole and the second pole of the driving transistor according to the data signals so as to supplement the charges in the driving transistor, redistribute the charges again, adjust the bias state of the driving transistor, slow down the hysteresis effect of the driving transistor and improve the threshold voltage drift problem of the driving transistor, so that the driving transistor can accurately drive the light-emitting element to emit light when a picture is switched, particularly when a black-white picture is switched, the picture display brightness is improved, the display smear is improved, and the display quality is improved; in addition, compared with the situation that the bias state of the driving transistor is adjusted by adopting a fixed voltage signal, in the technical scheme of the invention, the bias adjusting module receives the data signal provided by the data writing module, so that an additional fixed voltage signal is not required to be provided for bias adjustment of the driving transistor, the number of signals provided for a pixel circuit is reduced, the structure of the display panel is simplified, meanwhile, the electric charge in the driving transistor is supplemented according to the data signal, the supplemented electric charge in the driving transistor can be ensured to be consistent with the data signal provided for the grid electrode of the driving transistor, the driving transistor can generate accurate driving current, and the accuracy of a picture displayed by the display panel is improved.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the invention;
fig. 6 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of another display panel according to an embodiment of the disclosure;
fig. 8 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
fig. 9 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another pixel circuit according to an embodiment of the disclosure;
fig. 11 is a schematic cross-sectional view illustrating a display panel according to another embodiment of the present invention;
fig. 12 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 13 is a schematic cross-sectional view of another display panel according to an embodiment of the disclosure;
fig. 14 is a schematic cross-sectional view illustrating another display panel according to an embodiment of the invention;
fig. 15 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention, and with reference to fig. 1 and fig. 2, the display panel 1 includes: a plurality of pixel circuits 10 arranged in an array; the pixel circuit 10 includes a data writing module 11, a driving transistor M1, a bias adjusting module 12, and a light emitting element 13; in the same pixel circuit 10, the data writing module 11 is configured to write a data signal to the gate of the driving transistor M1; the driving transistor M1 is for supplying a driving current to the light emitting element 13 according to a data signal; the bias adjusting module 12 is electrically connected to the first pole of the driving transistor M1, the second pole of the driving transistor M1, and the data writing module 11, respectively, and the bias adjusting module 12 is configured to store a data signal provided by the data writing module 11 to the gate of the driving transistor M1, and provide charges to the first pole and the second pole of the driving transistor M1 according to the data signal.
It can be understood that the display panel 1 includes a plurality of pixel circuits 10 arranged in an array, and the driving transistors in the pixel circuits can drive the light emitting elements of the pixel circuits to emit light, so that the display panel presents a corresponding display image. In the pixel circuit 10, a voltage difference exists between the gate of the driving transistor M1 and the source or the drain thereof for a long time, so that the driving transistor is in a biased state for a long time, and the driving transistor M1 works in a biased state for a long time, which causes a threshold voltage drift thereof, and generates a hysteresis effect, so that a corresponding data signal cannot be accurately written into the gate of the driving transistor. For example, when two adjacent frames display different images, for example, a frame displayed in a previous frame is a black image, and a frame displayed in a next frame is a white image, the driving transistor M1 needs to be switched from the positive bias state to the negative bias state, but due to the hysteresis effect of the driving transistor M1, when the display panel is switched from the black image to the white image, the display brightness of the white image is low, and the display effect is further affected.
Based on this, fig. 2 exemplarily shows a structural schematic diagram of the pixel circuit, and as shown in fig. 2, the driving transistor M1 may be a P-channel transistor or an N-channel transistor, which is not limited in this embodiment of the present invention. The data writing module 11 is electrically connected to the first pole of the driving transistor M1, and on the data writing path, the pixel circuit 10 further includes a threshold compensation module 15 to compensate the threshold voltage of the driving transistor M1, so that the data writing module 11 writes the data signal Vdata to the gate of the driving transistor M1 sequentially through the driving transistor M1 and the threshold compensation module 15 in the data writing stage. Meanwhile, the data writing module 11 further provides a data signal Vdata to the bias adjusting module 12, so that the bias adjusting module 12 stores the data signal Vdata, and after the data signal writing is finished, the bias adjusting module 12 provides charges to the first pole and the second pole of the driving transistor M1 according to the data signal Vdata. Because the process of switching the driving transistor M1 from one bias state to another bias state is substantially redistribution of charges in the driving transistor M1, after data writing is finished, the bias adjusting module 12 provides charges to the first pole and the second pole of the driving transistor M1 according to the data signal Vdata, and can supplement the charges in the driving transistor M1, so that the charges in the driving transistor M1 can be redistributed according to the data signal Vdata, thereby achieving the purposes of adjusting the bias state of the driving transistor M1, improving the threshold voltage drift problem of the driving transistor M1, and alleviating the hysteresis effect of the driving transistor M1, and thus in the light emitting stage, the threshold voltage drift problem of the driving transistor M1 is improved, the driving transistor M1 can generate an accurate driving current, and the driving current can drive the light emitting element 13 to emit light accurately, thereby improving the display quality of the display panel.
The light emitting element 13 may include a sub-Micro light emitting diode (Mini-LED), a Micro light emitting diode (Micro-LED), an Organic Light Emitting Diode (OLED), and the like, which is not particularly limited in the embodiment of the present invention, and fig. 2 only illustrates the light emitting element 13 as an organic light emitting diode by way of example.
It should be noted that, specific electrical connection ways of the data writing module 11 and the driving transistor M1 include, but are not limited to, the structure shown in fig. 2, and fig. 2 only gives an exemplary structural schematic diagram of the pixel circuit 10. The pixel circuit 10 may further include an initialization module 14 and a light-emitting control module 16, where the initialization module 14 is configured to initialize the gate of the driving transistor M1 in an initialization phase, and the light-emitting control module 16 is configured to control the driving transistor M1 to provide a driving current to the light-emitting element 13, and details are not repeated here.
In the embodiment of the invention, by arranging the bias adjusting module electrically connected with the first pole of the driving transistor, the second pole of the driving transistor and the data writing module, the bias adjusting module can store the data signal provided by the data writing module to the grid electrode of the driving transistor, and provide charges to the first pole and the second pole of the driving transistor according to the data signal so as to supplement the charges in the driving transistor, redistribute the charges again, adjust the bias state of the driving transistor, slow down the hysteresis effect of the driving transistor and improve the threshold voltage drift problem of the driving transistor, so that the driving transistor can accurately drive the light-emitting element to emit light when a picture is switched, particularly when a black-white picture is switched, the picture display brightness is improved, the display smear is improved, and the display quality is improved; in addition, compared with the situation that the bias state of the driving transistor is adjusted by adopting a fixed voltage signal, in the technical scheme of the invention, the bias adjusting module receives the data signal provided by the data writing module, so that an additional fixed voltage signal is not required to be provided for bias adjustment of the driving transistor, the number of signals provided for a pixel circuit is reduced, the structure of the display panel is simplified, meanwhile, the electric charge in the driving transistor is supplemented according to the data signal, the supplemented electric charge in the driving transistor can be ensured to be consistent with the data signal provided for the grid electrode of the driving transistor, the driving transistor can generate accurate driving current, and the accuracy of a picture displayed by the display panel is improved.
Optionally, with continued reference to fig. 1, the pixel circuit includes a first pixel circuit 101 and a second pixel circuit 102; the light emitting element 13 of the first pixel circuit 101 emits a first color light, and the light emitting element 13 of the second pixel circuit 102 emits a second color light; the wavelength of the first color light is greater than that of the second color light; the channel width-to-length ratio of the driving transistor M1 in the first pixel circuit 101 is larger than that of the driving transistor M1 in the second pixel circuit 102.
The first pixel circuit 101 and the second pixel circuit 102 may be located at any position in the display panel 1, which is not specifically limited in this embodiment of the present invention. The first color light or the second color light emitted by the light emitting element 13 in the pixel circuit 10 includes, but is not limited to, red, green, blue, yellow, white, cyan, magenta, and the like, which is not specifically limited in this embodiment of the invention.
Specifically, the wavelength at which the light emitting element 13 of the first pixel circuit 101 emits the first color light is longer than the wavelength at which the light emitting element 13 of the second pixel circuit 102 emits the second color light, for example, the light emitting element 13 of the first pixel circuit 101 emits blue light, and the light emitting element 13 of the second pixel circuit 102 emits red light or green light. Since the light emitting elements 13 of different colors have different light emitting efficiencies due to different light emitting materials of the light emitting elements 13 of different colors, when the driving transistors M1 in the pixel circuits 10 have the same size, the light emitting efficiency of blue is low, and therefore, when the same display gray scale needs to be presented, the light emitting element of blue needs to generate a larger driving current, that is, the driving transistor M1 of the pixel circuit 10 where the light emitting element of blue is located needs to generate a larger driving current. The driving transistor M1 is usually operated in the saturation region, and the driving current I generated by the driving transistor is calculated by the formula
Where Vgs is the difference in gate-source voltage of the driving transistor M1, vth is the threshold voltage of the driving transistor M1, W is the width of the channel region, L is the length of the channel region, coxMu is the mobility of the active layer of the driving transistor, and the larger the channel width-to-length ratio W/L of the driving transistor M1 is, the larger the driving current generated by the driving transistor M1 is. Therefore, by setting the channel width-to-length ratio of the driving transistor M1 in the first pixel circuit 101 to be greater than the channel width-to-length ratio of the driving transistor M1 in the second pixel circuit 102, the driving current generated by the driving transistor M1 in the first pixel circuit 101 is greater than the driving current generated by the driving transistor M1 in the second pixel circuit 102 under the same data signal voltage, that is, when the driving transistors have the same gate-source voltage difference, so that the light emitting element of the first pixel circuit 101 and the light emitting element of the second pixel circuit 102 exhibit the same display gray scale, thereby improving the display quality.
Optionally, fig. 3 is a schematic structural diagram of another pixel circuit provided in an embodiment of the present invention, and referring to fig. 1 and fig. 3 in combination, the bias adjustment module 12 of the first pixel circuit 101 includes a first capacitor C1, and the bias adjustment module 12 of the second pixel circuit 102 includes a second capacitor C2; the capacitance value of the first capacitor C1 is smaller than that of the second capacitor C2.
The bias adjusting module 12 includes a capacitor C, the bias adjusting module 12 of the first pixel circuit 101 includes a first capacitor C1, the bias adjusting module 12 of the second pixel circuit 102 includes a second capacitor C2, that is, the bias adjusting module 12 is composed of a capacitor C, in a data writing stage, the data writing module 11 supplies a data signal to the gate of the driving transistor M1, and simultaneously charges the capacitor C, so that the data signal can be stored in the capacitor C, and after the data signal writing is finished, the capacitor C can supply charges to the first pole and the second pole of the driving transistor M1 according to the stored data signal, so that the charges in the driving transistor M1 can be redistributed according to the data signal to adjust the bias state of the driving transistor M1. It should be noted that capacitance values of the capacitors of the bias adjustment modules 12 in different pixel circuits 10 may be the same or different, and this is not particularly limited in the embodiment of the present invention, and may be set according to actual requirements.
Specifically, when the first pixel circuit 101 and the second pixel circuit 102 have the same display luminance, the data signal written by the data writing module 11 to the gate of the driving transistor M1 in the first pixel circuit 101 may be the same as the data signal written by the data writing module 11 to the gate of the driving transistor M1 in the second pixel circuit 102, and since the channel width-length ratio of the driving transistor M1 in the first pixel circuit 101 is greater than that of the driving transistor M1 in the second pixel circuit 102, the driving current generated by the driving transistor M1 in the first pixel circuit 101 is greater than that generated by the driving transistor M1 in the second pixel circuit 102, so that the first pixel circuit 101 and the second pixel circuit 102 have the same display luminance. However, when the channel width-length ratio of the driving transistor M1 in the first pixel circuit 101 is greater than the channel width-length of the driving transistor M1 in the second pixel circuit 102, the parasitic capacitance of the driving transistor M1 in the first pixel circuit 101 may be smaller than the parasitic capacitance of the driving transistor M1 in the second pixel circuit 102, that is, the parasitic capacitance of the driving transistor M1 in the second pixel circuit 102 is greater than the parasitic capacitance of the driving transistor M1 in the first pixel circuit 101, and the larger the parasitic capacitance is, the larger the charge amount required for charge redistribution is, and the larger the capacitance value of the capacitor C in the bias adjusting module 12 is required, so that by setting the capacitance value of the first capacitor C1 smaller than the capacitance value of the second capacitor C2, that the capacitance value of the second capacitor C2 is greater than the capacitance value of the first capacitor C1, the first capacitor C1 can provide a sufficient charge amount to the driving transistor M1 in the first pixel circuit 101 when the charge is full, it is ensured that the charge in the driving transistor M1 can be redistributed to reduce the drive effect of the second pixel circuit 102, and the hysteresis effect of the driving transistor M1 can be reduced when the pixel circuit is fully charged.
Optionally, fig. 4 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present invention, as shown in fig. 4, including a substrate 100; a plurality of insulating conductive layers 200 on one side of the substrate 100; the conductive layer 200 includes a first conductive layer 201, a second conductive layer 202, a third conductive layer 203, and a fourth conductive layer 204; the first conductive layer 201 comprises a first plate of the first capacitor C1, and the second conductive layer 202 comprises a second plate of the first capacitor C1; the third conductive layer 203 comprises a first plate of a second capacitor C2, and the fourth conductive layer 204 comprises a second plate of the second capacitor C2; in the thickness direction Z of the display panel 1, a distance d1 between the first conductive layer 201 and the second conductive layer 202 is larger than a distance d2 between the third conductive layer 203 and the fourth conductive layer 204.
The substrate 100 may be a flexible substrate or a rigid substrate, which is not limited in the embodiments of the present invention. When the substrate 100 is a flexible substrate, the substrate 100 may include one or more flexible layers, and the material of the flexible layer may include Polyimide (PI), which is not limited in this embodiment of the present invention.
The first conductive layer 201, the second conductive layer 202, the third conductive layer 203, and the fourth conductive layer 204 may be used as any one of the existing conductive layers in the display panel 1, and no additional arrangement is required, so as to reduce the thickness of the display panel 1, and facilitate the light and thin design of the display panel 1. In the embodiment of the present invention, specific materials of the first conductive layer 201, the second conductive layer 202, the third conductive layer 203, and the fourth conductive layer 204 are not limited at all, for example, the materials may be a metal material, or one or more of indium tin oxide, indium zinc oxide, or indium gallium zinc oxide, and this is not limited in the embodiment of the present invention.
Specifically, the capacitance value of the known capacitor is calculated by the formula
Wherein k is a constant of the electrostatic force, e is a relative dielectric constant, d is a distance between two opposite plates of the capacitor, and S is an overlapping area between the two opposite plates of the capacitor, so that when the first capacitor C2 and the second capacitor C2 are made of the same material, and the overlapping area between the two opposite plates of the first capacitor C1 is equal to the overlapping area between the two opposite plates of the second capacitor C2, by setting the first conductive layer 201The distance d1 between the second conductive layer 202 and the third conductive layer 203 is greater than the distance d2 between the fourth conductive layer 204 and the third conductive layer 203, that is, the distance d1 between two opposite plates of the first capacitor C1 is greater than the distance d2 between two opposite plates of the second capacitor C2, so that the capacitance value of the first capacitor C1 is smaller than the capacitance value of the second capacitor C2, and it can be further ensured that the first capacitor C1 in the first pixel circuit 101 provides a sufficient charge amount to the driving transistor M1, so that the charge in the driving transistor M1 is redistributed, and the bias state is adjusted, and the second capacitor C2 in the second pixel circuit 102 provides a sufficient charge amount to the driving transistor M1, so that the charge in the driving transistor M1 is redistributed, and the bias state is adjusted.
In other embodiments, the overlapping area between two opposite plates of the first capacitor C1 may also be smaller than the overlapping area between two opposite plates of the second capacitor C2; or, the overlapping area between two opposite plates of the first capacitor C1 may also be smaller than the overlapping area between two opposite plates of the second capacitor C2, and the ratio of the overlapping area between two opposite plates of the first capacitor C1 to d1 is smaller than the ratio of the overlapping area between two opposite plates of the second capacitor C2 to d2, so that the capacitance value of the first capacitor C1 is smaller than the capacitance value of the second capacitor C2, and the same technical effects as above are achieved, and details are not repeated here.
It should be noted that specific positions of the first conductive layer 201, the second conductive layer 202, the third conductive layer 203 and the fourth conductive layer 204 include, but are not limited to, those shown in fig. 4, and fig. 4 is only given for illustrative purposes.
In addition, the insulating material between adjacent conductive layers may be silicon oxide, silicon oxynitride, silicon nitride, aluminum oxide, titanium oxide, hafnium oxide, tantalum oxide, zirconium oxide, or the like, which is not limited in the embodiments of the present invention.
Optionally, fig. 5 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 5, the first conductive layer 201 is reused as the third conductive layer 203, that is, the first plate of the first capacitor C1 and the first plate of the second capacitor C2 are located in the same conductive layer, so that the number of film layers can be reduced, and the circuit structure layout of the display panel 1 is simplified.
Alternatively, in another embodiment, the first conductive layer 201 is multiplexed into the fourth conductive layer 204 (see fig. 6); alternatively, in yet another embodiment, second conductive layer 202 is multiplexed into third conductive layer 203 (shown with reference to fig. 7); or, in yet another embodiment, the second conductive layer 202 is reused as the fourth conductive layer 204 (refer to fig. 8), and the schematic structural diagrams of the display panel 1 in fig. 6 to fig. 8 can also achieve the beneficial effects of reducing the number of film layers and simplifying the circuit structural layout of the display panel 1 by enabling any two of the first conductive layer 201, the second conductive layer 202, the third conductive layer 203, and the fourth conductive layer 204 to be located at the same layer, and details are not repeated here.
It is to be understood that, without any particular description, the following embodiments may all be described by taking the cross-sectional structure of the display panel shown in fig. 5 as an example for easy understanding.
Optionally, fig. 9 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 9, any one of the first conductive layer 201, the second conductive layer 202, the third conductive layer 203, and the fourth conductive layer 204 includes a gate 301 of the driving transistor M1.
For example, taking the first conductive layer 201 as the third conductive layer 203 for example, fig. 9 shows that the first conductive layer 201 further includes a gate 301 of the driving transistor M1, that is, the first plate of the first capacitor C1, the first plate of the second capacitor C2 and the gate of the driving transistor M1 are located in the same conductive layer, so as to reduce the number of film layers and facilitate the light and thin design of the display panel 1.
In addition, in addition to the conductive layer including the gate electrode 301 of the driving transistor M1, one or more other conductive layers may be included in the first conductive layer 201, the second conductive layer 202, the third conductive layer 203, and the fourth conductive layer 204 to dispose the source electrode, the drain electrode, and the like of the driving transistor M1, or a conductive layer to dispose the anode electrode 131 of the light emitting element 13 may be included, but the present invention is not limited thereto, and may be disposed according to actual requirements, and fig. 9 is merely an exemplary illustration.
It should be noted that in other embodiments, any one of the second conductive layer 202, the third conductive layer 203, and the fourth conductive layer 204 may further include the gate 301 of the driving transistor M1.
Optionally, fig. 10 is a schematic structural diagram of another pixel circuit provided in an embodiment of the present invention, and fig. 11 is a schematic cross-sectional structural diagram of another display panel provided in an embodiment of the present invention, and with reference to fig. 10 and fig. 11, the pixel circuit 10 includes at least one first transistor M2, and a first pole or a second pole of the first transistor M2 is electrically connected to a gate of the driving transistor M1; the channel type of the first transistor M2 is different from the channel type of the driving transistor M1.
The first transistor M2 may be an initialization transistor in the initialization module 14 or a threshold compensation transistor in the threshold compensation module 15, but is not limited thereto, and this is not specifically limited in the embodiment of the present invention.
Specifically, when the driving transistor M1 is a P-channel transistor, the second transistor M2 is an N-channel transistor, and conversely, when the driving transistor M1 is an N-channel transistor, the second transistor M2 is a P-channel transistor. Preferably, referring to fig. 10, in the same pixel circuit 10, the driving transistor M1 is a P-channel transistor, for example, the driving transistor M1 is a low-temperature polysilicon transistor, and the first transistor M2 is an N-channel transistor, for example, an oxide thin film transistor, and further, the initializing transistor and the threshold compensating transistor are both oxide thin film transistors, which can reduce leakage current, maintain stability of the gate potential of the driving transistor M1, further ensure light-emitting stability of the light-emitting element 13, and improve display quality.
Optionally, with continued reference to fig. 11, a first semiconductor layer 205 and a second semiconductor layer 206 located on one side of the substrate 100 and spaced apart from each other in an insulating manner; the first semiconductor layer 205 and the second semiconductor layer 206 are insulated from each other; the first semiconductor layer 205 includes an active layer of the driving transistor M1, and the second semiconductor layer 206 includes an active layer of the first transistor M2; one of the first conductive layer 201, the second conductive layer 202, the third conductive layer 203, and the fourth conductive layer 204 includes a gate electrode 401 of the first transistor M2, and the other conductive layer includes a gate electrode of the driving transistor M1.
For example, taking the driving transistor M1 as a P-channel transistor and the first transistor M2 as an N-channel transistor, the first semiconductor layer 205 includes an active layer of the driving transistor M1, so that the first semiconductor layer 205 may include silicon, such as polysilicon, and the driving transistor M1 may be a low temperature polysilicon transistor. The second semiconductor layer 206 includes an active layer of the first transistor M2, the second semiconductor layer 206 may include an oxide semiconductor, such as indium gallium zinc oxide, and the first transistor M2 is an oxide thin film transistor. But not limited thereto, those skilled in the art can set the setting according to actual needs.
Further, one of the first conductive layer 201, the second conductive layer 202, the third conductive layer 203, and the fourth conductive layer 204 includes the gate 401 of the first transistor M2, and the other includes the gate of the driving transistor M1, fig. 10 exemplarily shows that the first conductive layer 201 is multiplexed as the third conductive layer 203, and the first conductive layer 201 includes the gate of the driving transistor M1, and the fourth conductive layer 204 includes the gate 401 of the first transistor M2, so as to reduce the number of layers and ensure the lightness and thinness of the display panel, in other embodiments, the second conductive layer 202 may include the gate 401 of the first transistor M2, but is not limited to, and may be set according to actual requirements.
Optionally, fig. 12 is a schematic structural diagram of another pixel circuit provided in an embodiment of the present invention, and fig. 13 is a schematic cross-sectional structural diagram of another display panel provided in an embodiment of the present invention, and in combination with fig. 12 and fig. 13, the pixel circuit 10 further includes a storage capacitor Cst; one of the first plate and the second plate of the storage capacitor Cst is electrically connected to the gate of the driving transistor M1, and the other is electrically connected to the fixed power signal terminal PVDD, so that the storage capacitor Cst can maintain the potential of the gate of the driving transistor M1 when the pixel circuit 10 operates in the light emitting stage, so as to ensure that the driving transistor M1 can continuously and stably generate the driving current under the action of the potential of the gate of the driving transistor M1 and the fixed power signal terminal PVDD in the light emitting stage, and the light emitting element 13 is driven to stably emit light. As shown in fig. 12, the pixel circuit 10 may further include a reset module 17, where the reset module 17 is configured to reset the potential of the anode of the light-emitting element 13, so as to reduce the influence of the potential of the anode of the light-emitting element 13 in the previous frame on the potential of the anode of the light-emitting element 13 in the next frame, and improve the display effect.
It should be noted that the transistor in the data writing module 11, the transistor in the light-emitting control module 16, and the transistor in the reset module 17 may have the same channel type as the driving transistor M1, or may have the same channel type as the first transistor M2. Fig. 10 and 12 are merely exemplary illustrations.
Optionally, the first plate of the storage capacitor Cst and at least one of the first plate of the first capacitor C1 and the first plate of the second capacitor C2 are disposed in the same layer, and/or the second plate of the storage capacitor Cst and at least one of the second plate of the first capacitor C1 and the second plate of the second capacitor C2 are disposed in the same layer. It can be understood that one of the two plates of the storage capacitor Cst is disposed on the same layer as at least one of the two plates of the first capacitor C1, or one of the two plates of the storage capacitor Cst is disposed on the same layer as at least one of the two plates of the second capacitor C2, so as to reduce the number of films, simplify the circuit structure, and facilitate the thinning of the display panel 1.
For example, taking the first conductive layer 201 as the third conductive layer 203, one of the two plates of the storage capacitor Cst and the first plate of the first capacitor C1 and the first plate of the second capacitor C2 are located at the same layer, and the other of the two plates of the storage capacitor Cst and the second plate of the second capacitor C2 are located at the same layer in fig. 12.
Optionally, fig. 14 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention, and as shown in fig. 14, the bias adjustment module 12 includes a variable capacitor Cx.
Illustratively, the variable capacitance Cx may be formed by three conductive layers located in different layers, namely, the first plate 121, the second plate 122 and the third plate 123, where a distance d3 between the first plate 121 and the second plate 122 is different from a distance d4 between the second plate 122 and the third plate 123, and when a signal is provided to the first plate 121 and the second plate 122, the corresponding variable capacitance Cx is formed by two opposite plates of the first plate 121 and the second plate 122, or when a signal is provided to the second plate 122 and the third plate 123, the corresponding variable capacitance Cx is formed by two opposite plates of the second plate 122 and the third plate 123, so that the capacitance value of the variable capacitance Cx can be changed by adjusting the signals provided to the different plates.
In other embodiments, the size of the variable capacitance Cx can be adjusted by using the difference in the overlapping area between the first plate 121, the second plate 122 and the third plate 123 and selecting different plates to provide a signal, which is not specifically limited in the embodiment of the present invention.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, and fig. 15 is a schematic structural diagram of the display device according to the embodiment of the present invention, and as shown in fig. 15, the display device 2 includes the display panel 1 according to any embodiment of the present invention, so that the display device 2 according to the embodiment of the present invention includes the technical features of the display panel 1 according to the embodiment of the present invention, and the advantageous effects of the display panel 1 according to the embodiment of the present invention can be achieved, and the same points can refer to the above description of the display panel 1 according to the embodiment of the present invention, and are not repeated herein. The display device 2 provided in the embodiment of the present invention may be a mobile phone as shown in fig. 15, and may also be any electronic product with a display function, including but not limited to the following categories: the touch screen display system comprises a television, a notebook computer, a desktop display, a tablet computer, a digital camera, an intelligent bracelet, intelligent glasses, a vehicle-mounted display, medical equipment, industrial control equipment, a touch interaction terminal and the like, and the embodiment of the invention is not particularly limited in this respect.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A display panel, comprising: a plurality of pixel circuits arranged in an array;
the pixel circuit comprises a data writing module, a driving transistor, a bias adjusting module and a light-emitting element;
in the same pixel circuit, the data writing module is used for writing a data signal into the grid electrode of the driving transistor; the driving transistor is used for providing driving current for the light-emitting element according to the data signal; the bias adjusting module is electrically connected with the first pole of the driving transistor, the second pole of the driving transistor and the data writing module respectively, and the bias adjusting module is used for storing a data signal provided by the data writing module to the gate of the driving transistor and providing charges to the first pole and the second pole of the driving transistor according to the data signal.
2. The display panel according to claim 1, wherein the pixel circuit comprises a first pixel circuit and a second pixel circuit;
the light emitting element of the first pixel circuit emits a first color light, and the light emitting element of the second pixel circuit emits a second color light; the wavelength of the first color light is greater than the wavelength of the second color light;
the channel width-to-length ratio of the driving transistor in the first pixel circuit is larger than the channel width-to-length ratio of the driving transistor in the second pixel circuit.
3. The display panel according to claim 2, wherein the bias adjustment block of the first pixel circuit comprises a first capacitor, and the bias adjustment block of the second pixel circuit comprises a second capacitor;
the capacitance value of the first capacitor is smaller than that of the second capacitor.
4. The display panel according to claim 3, further comprising:
a substrate base plate;
the insulating interval multilayer conducting layer is positioned on one side of the substrate base plate; the conductive layers comprise a first conductive layer, a second conductive layer, a third conductive layer and a fourth conductive layer;
the first conducting layer comprises a first plate of the first capacitor, and the second conducting layer comprises a second plate of the first capacitor; the third conductive layer comprises a first plate of the second capacitor, and the fourth conductive layer comprises a second plate of the second capacitor;
in a thickness direction of the display panel, a distance between the first conductive layer and the second conductive layer is larger than a distance between the third conductive layer and the fourth conductive layer.
5. The display panel according to claim 4, wherein the first conductive layer is multiplexed into the third conductive layer; or, the first conductive layer is multiplexed into the fourth conductive layer; or the second conducting layer is multiplexed into the third conducting layer; or, the second conductive layer is multiplexed as the fourth conductive layer.
6. The display panel according to claim 4, wherein any one of the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer comprises a gate of the driving transistor.
7. The display panel according to claim 4, wherein the pixel circuit comprises at least one first transistor, and a first pole or a second pole of the first transistor is electrically connected to a gate of the driving transistor;
the channel type of the first transistor is different from the channel type of the driving transistor.
8. The display panel according to claim 7, further comprising:
the first semiconductor layer and the second semiconductor layer are positioned on one side of the substrate base plate and are insulated and spaced from each other; the first semiconductor layer and the second semiconductor layer are insulated from the conductive layers;
the first semiconductor layer includes an active layer of the driving transistor, and the second semiconductor layer includes an active layer of the first transistor;
one of the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer includes a gate of the first transistor, and the other of the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer includes a gate of the driving transistor.
9. The display panel according to claim 3, wherein the pixel circuit further comprises a storage capacitor;
one of a first electrode plate and a second electrode plate of the storage capacitor is electrically connected with the grid electrode of the driving transistor, and the other one of the first electrode plate and the second electrode plate of the storage capacitor is electrically connected with a fixed power supply signal end;
the first polar plate of the storage capacitor is arranged in the same layer with at least one of the first polar plate of the first capacitor and the first polar plate of the second capacitor; and/or the second plate of the storage capacitor and at least one of the second plate of the first capacitor and the second plate of the second capacitor are arranged in the same layer.
10. The display panel of claim 1, wherein the bias adjustment module comprises a variable capacitance.
11. A display device characterized by comprising the display panel according to any one of claims 1 to 10.
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