CN114724516B - Display panel, control method thereof and display device - Google Patents
Display panel, control method thereof and display device Download PDFInfo
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- CN114724516B CN114724516B CN202210449065.9A CN202210449065A CN114724516B CN 114724516 B CN114724516 B CN 114724516B CN 202210449065 A CN202210449065 A CN 202210449065A CN 114724516 B CN114724516 B CN 114724516B
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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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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The embodiment of the invention discloses a display panel, a control method thereof and a display device. The display panel includes: a first light emitting element and a first pixel circuit; the output end of the first pixel circuit is connected with at least two first light-emitting elements, and the first pixel circuit comprises at least two first driving modules which are connected in parallel and are used for responding to the data voltage to generate driving current so as to drive the at least two first light-emitting elements connected with the first pixel circuit to emit light. The embodiment of the invention reduces the number of the pixel circuits in the display panel, thereby reducing the cost for manufacturing the pixel circuits in the display panel and further reducing the cost of the display panel.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a control method thereof and a display device.
Background
An Organic Light-Emitting Diode (OLED) display panel has the characteristics of self-luminous display, no need of backlight source, high response speed, low power consumption, flexible display and the like, and is one of the most potential flat panel display devices.
In recent years, with rapid development of display technology, there is an increasing demand for resolution of display panels. However, since the display panel of the related art mostly adopts one pixel circuit to drive one light emitting element, the realization of higher resolution means not only that more light emitting elements are provided in the display panel, but also that correspondingly more pixel circuits are required in the display panel. The display panel has higher cost due to the arrangement of more pixel circuits.
Disclosure of Invention
The embodiment of the invention provides a display panel, a control method thereof and a display device, which can reduce the number of pixel circuits in the display panel, thereby reducing the cost of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, where the display panel includes a first pixel circuit and a first light emitting element, and the first pixel circuit includes at least two first driving modules connected in parallel;
the output end of the first pixel circuit is connected with at least two first light-emitting elements, and the at least two first driving modules are used for responding to data voltages to generate driving currents so as to drive the at least two first light-emitting elements connected with the first pixel circuit to emit light.
Optionally, the number of the first driving modules provided in the first pixel circuit is the same as the number of the first light emitting elements connected to the first pixel circuit.
Optionally, the first ends of all the first driving modules in the first pixel circuit are connected, the second ends of all the first driving modules are connected, and the control ends of all the first driving modules are connected.
Optionally, the first driving module includes a first driving transistor; the control end of the first driving transistor is used as the control end of the first driving module, the first end of the first driving transistor is used as the first end of the first driving module, and the second end of the first driving transistor is used as the second end of the first driving module.
Optionally, the display panel includes a first display area and a second display area, the light transmittance of the first display area is greater than the light transmittance of the second display area, and the first light emitting element is located in the first display area;
optionally, the display panel further includes a second pixel circuit and a second light emitting element, where the second light emitting element is located in the second display area, and the second pixel circuit includes a second driving module; the output end of the second pixel circuit is connected with the second light-emitting element, and the second driving module is used for responding to the data voltage to generate driving current so as to drive the second light-emitting element connected with the second pixel circuit to emit light;
At least one device parameter of the second driving module and the first driving module is the same.
Optionally, the first driving module includes a first driving transistor, the second driving module includes a second driving transistor, and at least one device parameter of the second driving module and the first driving module is the same, including: the width-to-length ratio of the second driving transistor is the same as that of the first driving transistor;
optionally, the control terminal of the second driving transistor is used as the control terminal of the second driving module, the first terminal of the second driving transistor is used as the first terminal of the second driving module, and the second terminal of the second driving transistor is used as the second terminal of the second driving module; the second driving transistor has the same width-to-length ratio as the first driving transistor.
Optionally, the first pixel circuit and the second pixel circuit are both located in the second display area.
Optionally, the first driving module includes a first driving transistor; the active layers of at least two of the first driving transistors in the first pixel circuit are arranged in the same layer, and/or the gate metal layers of at least two of the first driving transistors in the first pixel circuit are arranged in the same layer.
In a second aspect, an embodiment of the present invention further provides a control method for a display panel, where the display area of the display panel includes a first display area and a second display area, the display panel includes a first pixel circuit, a first light emitting element, a second pixel circuit, and a second light emitting element, the second light emitting element is located in the second display area, an output end of the second pixel circuit is connected to the second light emitting element, the second pixel circuit includes a second driving module, and the second driving module is identical to the first driving module; the method comprises the following steps:
in a light-emitting stage, controlling all the first driving modules in the first pixel circuit to be conducted so that each first driving module in the first pixel circuit respectively responds to the data voltage to generate driving current, and thus each first light-emitting element connected with the first pixel circuit is lightened simultaneously;
and controlling the second driving module in the second pixel circuit to be conducted so that the second driving module in the second pixel circuit responds to the data voltage to generate driving current, and accordingly the second light-emitting element connected with the corresponding second pixel circuit is lightened.
In a third aspect, an embodiment of the present invention further provides a display apparatus, including a light sensing device and a display panel as described in the first aspect above; the first display area is arranged corresponding to the light sensing device.
In the technical scheme of the embodiment of the invention, the display panel comprises a first pixel circuit and a first light-emitting element. The first pixel circuit comprises at least two first driving modules connected in parallel, the output end of the first pixel circuit is connected with at least two first light-emitting elements, and the at least two first driving modules are used for responding to data voltages to generate driving currents so as to drive the at least two first light-emitting elements connected with the first pixel circuit to emit light. The embodiment of the invention reduces the number of the pixel circuits in the display panel on the premise of ensuring high resolution of the display panel, thereby reducing the cost of manufacturing the pixel circuits in the display panel and further reducing the cost of the display panel compared with the prior art that at least two first light emitting elements connected with one first pixel circuit are driven to emit light by at least two first driving modules connected in parallel in one first pixel circuit.
Drawings
Fig. 1 is a schematic structural diagram of a first pixel circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an under-screen camera display panel according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit structure in the prior art for driving a plurality of light emitting elements to emit light by using one pixel circuit;
fig. 4 is a schematic structural diagram of a second pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another first pixel circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second pixel circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another first pixel circuit according to an embodiment of the present invention;
FIG. 8 is a schematic top view of the first pixel circuit shown in FIG. 5 in a display panel;
fig. 9 is a schematic diagram of a parallel arrangement structure of a first driving transistor according to an embodiment of the present invention;
fig. 10 is a driving timing chart of a pixel circuit according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic structural diagram of a first pixel circuit according to an embodiment of the present invention. Referring to fig. 1, the display panel includes: a first light emitting element D10 and a first pixel circuit comprising at least two first driving modules 10 connected in parallel; the output terminal N1 of the first pixel circuit is connected to at least two first light emitting devices D10, and the at least two first driving modules 10 are configured to generate driving currents in response to the data voltage Vdata to drive the at least two first light emitting devices D10 connected to the first pixel circuit to emit light.
Wherein the first light emitting element D10 includes, but is not limited to, an OLED or an LED. The first driving module 10 may include a transistor, and the first driving module 10 may generate a driving current in response to a voltage of a control terminal c thereof, during which a data voltage Vdata required by the first driving module 10 may be provided by a data signal line in the display panel.
Specifically, the output terminal N1 of the first pixel circuit may be connected to the anodes of the at least two first light emitting elements D10, and the cathodes of the at least two first light emitting elements D10 may be connected to the same power source (e.g., connected to the same power source ELVSS), so that the at least two first light emitting elements D10 form a parallel connection. The output terminal N1 of the first pixel circuit is configured to output the driving current generated by the first driving module 10, so as to form a driving scheme in which the at least two first light emitting elements D10 are driven by the first pixel circuit simultaneously, i.e. a driving scheme with multiple driving steps. Referring to fig. 1 for exemplary illustration, the output terminal N1 of the first pixel circuit is connected to two first light emitting elements d10_1 and d10_2, the first light emitting element d10_1 and the first light emitting element d10_2 are connected in parallel, and the output terminal N1 of the first pixel circuit outputs the driving current Isd generated by the first driving module 10, so that the first light emitting element d10_1 and the first light emitting element d10_2 can be simultaneously driven to emit light by the driving current Isd of the output terminal of the first pixel circuit.
On the basis, the first pixel circuit in the embodiment of the invention comprises at least two first driving modules 10 connected in parallel, and the at least two first driving modules 10 respond to the data voltage Vdata to generate driving current so as to drive at least two first light emitting elements D10 connected with the first pixel circuit to emit light. That is, in the embodiment of the present invention, when the output terminal N1 of the first pixel circuit is connected to at least two first light emitting elements D10, the driving current supplied to the output terminal N1 of the first pixel circuit is not generated by only one first driving module of the first pixel circuit, but is commonly generated by at least two parallel first driving modules 10 of the first pixel circuit, and the driving current for simultaneously driving the at least two first light emitting elements D10 is commonly shared by a plurality of first driving modules 10 arranged in parallel in the first pixel circuit.
That is, the embodiment of the invention sets the driving current generated by the at least two first driving modules 10 in response to the data voltage Vdata in the first pixel circuit to drive the at least two first light emitting elements D10 connected to the first pixel circuit to emit light, and phase-change adjusts the driving scheme, so that the first pixel circuit is not a simple one-drive-more driving scheme but a substantial multi-drive-more driving scheme. Referring to fig. 1 for exemplary illustration, in the case where the first pixel circuit simultaneously drives the first light emitting element d10_1 and the first light emitting element d10_2 to emit light, the first pixel circuit includes two first driving modules 10_1 and 10_2 connected in parallel, a driving current Isd outputted from an output terminal N1 of the first pixel circuit is commonly generated by the first driving module 10_1 and the first driving module 10_2 connected in parallel, and a driving current is generated by the first driving module 10_1 and the first driving module 10_2 to simultaneously drive the first light emitting element d10_1 and the first light emitting element d10_2 to emit light.
The embodiment of the invention is arranged in such a way that a multi-drive driving scheme can be realized without additionally adding a pixel circuit. In this embodiment of the present invention, the number of the first driving modules 10 in the first pixel circuit may be greater than the number of the first light emitting elements D10 connected to the first pixel circuit, or the number of the first driving modules 10 in the first pixel circuit may be less than the number of the first light emitting elements D10 connected to the first pixel circuit, or the number of the first driving modules 10 in the first pixel circuit may be equal to the number of the first light emitting elements D10 connected to the first pixel circuit. Compared with the prior art that one pixel circuit is used for driving one light emitting element to emit light, the three conditions are beneficial to reducing the number of the pixel circuits in the display panel, thereby reducing the cost of manufacturing the pixel circuits in the display panel and further reducing the cost of the display panel.
The technical scheme provided by the embodiment of the invention is not only suitable for any other type of display panel, but also suitable for the display panel of the under-screen camera. Specifically, with rapid development of display technologies, display devices such as smartphones are becoming more popular, in order to improve the screen ratio of the display device and not to damage the integrity of the display, a camera is disposed below the screen, and an external image is acquired through the screen, and the camera disposed below the screen is called an under-screen camera (Under Display Camera, UDC), and a display area corresponding to the under-screen camera is called a UDC area. As shown in fig. 2, fig. 2 is a schematic structural diagram of an under-screen camera display panel according to an embodiment of the present invention, where a display area of the under-screen camera display panel includes a first display area AA1 and a second display area AA2; the first display area AA1 can be used as a UDC area corresponding to the under-screen camera, and the second display area AA2 is another display area of the display panel; alternatively, the first display area AA1 is used as another display area of the display panel, and the second display area AA2 is used as a UDC area. In particular, when the light transmittance of the first display area AA1 is greater than that of the second display area AA2, the first display area AA1 may be selected to obtain an external image, so that the first display area AA1 may be used as a UDC area corresponding to the under-screen camera, and the second display area AA2 may be used as other display areas of the display panel.
When the technical scheme provided by the embodiment of the invention is adopted in the display panel of the under-screen camera, the first display area AA1 and the second display area AA2 can both adopt the first light-emitting element and the first pixel circuit, so that the number of the pixel circuits in the display panel of the under-screen camera can be greatly reduced compared with the number of the pixel circuits in the display panel of the under-screen camera when the light-emitting element is driven by one pixel circuit to emit light in the prior art on the premise of ensuring the high resolution of the whole display area of the display panel of the under-screen camera, thereby reducing the cost of manufacturing the pixel circuits in the display panel of the under-screen camera and further reducing the cost of the display panel of the under-screen camera. The first light emitting element and the first pixel circuit are adopted in the display area around the UDC area, so that the number of the pixel circuits in the display area around the UDC area can be greatly reduced on the premise of ensuring that the display area around the UDC area has high resolution, the cost of manufacturing the pixel circuits in the display area around the UDC area is reduced, and the manufacturing cost of the display panel of the under-screen camera is further reduced. Of course, only the first light emitting element and the first pixel circuit can be adopted in the UDC area, so that the number of the pixel circuits in the UDC area can be greatly reduced on the premise of ensuring that the UDC area has high resolution, the cost of manufacturing the pixel circuits in the UDC area is reduced, and the manufacturing cost of the display panel of the under-screen camera is further reduced.
According to the technical scheme provided by the embodiment of the invention, when only the first light-emitting element and the first pixel circuit are adopted in the UDC area and one pixel circuit is adopted in the display area around the UDC area to drive one light-emitting element to emit light, the cost for manufacturing the pixel circuit in the UDC area can be reduced, the manufacturing cost of the display panel of the camera under the screen is further reduced, and the other technical problem of the display panel of the camera under the screen can be solved. The other technical problem is that: the reason why the display difference occurs in the display panel of the camera under the screen due to the inconsistent brightness of the UDC area and the surrounding display area is studied by the inventor of the invention is that:
in an under-screen camera display panel, in order to ensure high transmittance in a UDC region, only a light emitting element is generally provided in the UDC region, and a pixel circuit for driving the light emitting element in the UDC region to emit light is provided in other regions of the display panel (for example, a display region around the UDC region). In addition, in order to avoid the problem of insufficient layout space of the display panel, the UDC area is driven by a one-drive-multiple driving scheme, that is, one pixel circuit is used to drive a plurality of light emitting elements to emit light, for example, two or three or more light emitting elements of the UDC area are driven by one pixel circuit to emit light, while other display areas of the display panel may still use a one-drive-one driving scheme in which one pixel circuit is used to drive one light emitting element to emit light. Referring to fig. 3, fig. 3 is a schematic diagram of a circuit structure in the related art in which one pixel circuit is used to drive a plurality of light emitting elements to emit light, and fig. 3 schematically illustrates a structure in which one pixel circuit is used to drive two light emitting elements (D1 and D2) to emit light.
However, with continued reference to fig. 3, it is due to this one-drive-more driving scheme that only one driving transistor DT in the pixel circuit for driving the light emitting elements to emit light must have the capability of generating a large driving current to ensure that the generated driving current can simultaneously light the light emitting elements; as for fig. 3, it is ensured that the driving current Ids generated thereby can simultaneously light the light emitting elements D1 and D2; however, only one driving transistor in the other pixel circuits of the display panel adopting the one-driving scheme still needs to have the capability of generating the driving current for driving one light emitting element to emit light. In this case, in order to provide the driving transistor employed in the one-drive-multiple-driving scheme with the capability of generating a large driving current, the device parameters of the driving transistor employed in the one-drive-multiple-driving scheme may be different from those of the driving transistor employed in the one-drive-one-driving scheme. For example, the size (e.g., aspect ratio) of the drive transistors employed in a one-drive-multiple-drive scheme may be larger than the size of the drive transistors employed in a one-drive-one-drive scheme.
The different setting of the device parameters of the driving transistor further causes the problem of display variation in the display panel. Specifically, in the Gamma adjustment stage of the display panel, the brightness of the UDC area and the brightness of other display areas of the display panel are substantially consistent and substantially unchanged by adjusting the Gamma value of the UDC area and the Gamma value of the other display areas of the display panel, however, in the Gamma adjustment stage of the display panel, the brightness of the UDC area and the brightness of the other display areas of the display panel are not consistent and substantially unchanged due to the fact that the physical characteristics (such as the size and the like) of the driving transistors in the pixel circuits directly affect the gray scale brightness difference of the display panel, which causes the phenomenon that the brightness of the UDC area and the brightness of the other display areas of the display panel are inconsistent and further display differences occur due to the fact that the device parameters of the driving transistors in the pixel circuits of the one-drive-multiple-drive scheme and the device parameters of the driving transistors in the pixel circuits of the one-drive-scheme are greatly different.
Therefore, by adopting the technical scheme of the embodiment of the invention, the cost of manufacturing the pixel circuit in the UDC area can be reduced by adopting the first light emitting element and the first pixel circuit only in the UDC area, so that the manufacturing cost of the display panel of the under-screen camera is reduced, and the display effect of the display device is optimized by using the light transmittance of the first display area AA1 which is larger than that of the second display area AA2 for illustration because the device parameters of the driving transistors adopted in the one-drive-multiple-drive scheme are greatly different from the device parameters of the driving transistors sampled in the one-drive-multiple-drive scheme when the UDC area is adopted in the one-drive-multiple-drive scheme.
Specifically, the first light emitting element D10 may be located in the first display area AA1, so that the first light emitting element D10 is advantageous to ensure the integrity of the display panel when it is lit. Then, since the first pixel circuit according to the embodiment of the invention is not a simple one-drive-multiple-drive scheme, but a multi-drive-multiple-drive-scheme, it is beneficial to make the drive scheme of the first display area AA1 and the drive scheme of the second display area AA2 of the display panel be close to be identical, and generally the drive scheme of the second display area AA2 is a one-drive-multiple-drive scheme. In the case where the driving scheme of the first display area AA1 is nearly identical or completely identical to the driving scheme of the second display area AA2 of the display panel, the device parameters of the first driving module 10 in the first pixel circuit are nearly identical or even completely identical to the device parameters of the driving module of the pixel circuit for driving the second display area AA2 to emit light, in order to save layout space of the display panel and simplify the manufacturing process of the display panel. Therefore, the phenomenon that the brightness of the first display area AA1 and the second display area AA2 cannot be regulated to be basically consistent and basically have no difference in display caused by the larger difference between the device parameters of the first driving module 10 in the first pixel circuit and the device parameters of the driving module of the pixel circuit for driving the second display area AA2 to emit light in the Gamma regulation stage of the display panel can be improved, so that the brightness of the first display area AA1 and the brightness of the second display area AA2 can be regulated to be basically the same through respective Gamma regulation, basically have no difference in display, further the display effect of the display panel is optimized, and the display effect of the display device is optimized.
In addition, the technical scheme of the embodiment of the invention can realize a multi-drive driving scheme without additionally adding pixel circuits, so that the first pixel circuit has a simple structure, low cost and low cost, is beneficial to the low cost of the display panel, basically does not cause the problem of insufficient layout space of the display panel, and reasonably utilizes the layout space of the display panel.
In the above embodiment, the parallel arrangement of at least two first driving modules 10 in the first pixel circuit may be specifically as exemplarily illustrated in fig. 1: the first terminals a of all the first driving modules 10 provided in the first pixel circuit are connected, the second terminals b of all the first driving modules 10 are connected, and the control terminals c of all the first driving modules 10 are connected. At this time, the data voltage Vdata is written to the common control terminal c connected to all the first driving modules 10 in the first pixel circuit, and each of the first driving modules 10 generates a driving current according to the data voltage Vdata, and the driving currents generated by all the first driving modules 10 are finally converged at the output terminal N1 of the first pixel circuit and then simultaneously supplied to at least two first light emitting elements D10 connected to the first pixel circuit.
That is, in the first pixel circuit, the driving current supplied to the output terminal N1 of the first pixel circuit is divided equally by all the first driving modules 10 in the first pixel circuit, each of the first driving modules 10 corresponds to one current branch for generating the driving current, and the plurality of parallel-connected first driving modules 10 corresponds to a plurality of parallel-connected current branches for generating the driving current; meanwhile, the driving current output by the output end N1 of the first pixel circuit is equally divided by all the first light emitting elements D10 connected with the first pixel circuit, each first light emitting element D10 corresponds to a shunt branch for emitting light in response to the driving current, and the plurality of first light emitting elements D10 connected in parallel correspond to a plurality of shunt branches for emitting light in response to the driving current.
On the basis of the above-described embodiment, reference may be made to fig. 1, as an embodiment of the present invention, alternatively, the number of the first driving modules 10 provided in the first pixel circuit is the same as the number of the first light emitting elements D10 connected to the first pixel circuit.
Specifically, when the number of the first driving modules 10 provided in the first pixel circuit is the same as the number of the first light emitting elements D10 to which the first pixel circuit is connected, one first driving module 10 generates a driving current for driving one first light emitting element D10 in the first pixel circuit, that is, one first driving module 10 is for driving one first light emitting element D10 to emit light. Thus, although the driving scheme is a multi-driving scheme, the multi-driving scheme is substantially equivalent to a one-driving scheme, and at this time, if the second display area AA2 adopts a one-driving scheme, the driving scheme of the first display area AA1 and the driving scheme of the second display area AA2 are both one-driving schemes.
In the case where the driving scheme of the first display area AA1 is identical to that of the second display area AA2, the device parameters of any first driving module 10 in the first pixel circuit and the device parameters of the driving module of the pixel circuit for driving the second display area AA2 to emit light will also be substantially identical. Therefore, the phenomenon that the brightness of the first display area AA1 and the second display area AA2 cannot be regulated to be basically consistent and basically no difference is displayed due to the fact that the device parameter of the first driving module 10 in the first pixel circuit is larger than the device parameter of the driving module of the pixel circuit for driving the second display area AA2 to emit light in the Gamma regulation stage of the display panel can be better improved.
In order to more specifically describe the technical solution of the embodiment of the present invention, optionally, fig. 4 is a schematic structural diagram of a second pixel circuit provided in an embodiment of the present invention, and referring to fig. 2 and fig. 4, the display panel further includes a second pixel circuit and a second light emitting element D01, the second light emitting element D01 is located in the second display area AA2, the second pixel circuit includes a second driving module 01, an output terminal N2 of the second pixel circuit is connected to the second light emitting element D01, and the second driving module 01 is configured to generate a driving current in response to the data voltage Vdata so as to drive the second light emitting element D01 connected to the second pixel circuit to emit light; the second drive module 01 and the first drive module 10 have at least one device parameter that is the same.
Wherein the second light emitting element D01 includes, but is not limited to, an OLED or an LED; the second driving module 01 can generate a driving current in response to the voltage of the control terminal, and the data voltage Vdata required by the second driving module 01 can be provided by the data signal line in the display panel. In addition, in order to ensure that the first display area AA1 has higher light transmittance, the second pixel circuit and the first pixel circuit are optionally disposed in the second display area AA2.
Specifically, the number of the second driving modules 01 in the second pixel circuit is one, and the number of the second light emitting elements D01 connected to the output end N2 of the second pixel circuit is also one, so as to form a one-driving scheme, and at this time, if the number of the first driving modules 10 set in the first pixel circuit is the same as the number of the first light emitting elements D10 connected to the first pixel circuit, the driving schemes of the first display area AA1 and the second display area AA2 are both one-driving schemes.
In the case that the driving scheme of the first display area AA1 is identical to that of the second display area AA2, the embodiment of the invention directly sets at least one device parameter (such as a size, etc.) of the first driving module 10 and the second driving module 01 to be identical, so that the phenomenon that the brightness of the first display area AA1 and the brightness of the second display area AA2 cannot be adjusted to be substantially consistent and the display is substantially free from difference due to the fact that the difference of at least one device parameter of the first driving module 10 in the first pixel circuit and the second driving module 01 in the second pixel circuit is larger in the Gamma adjusting stage of the display panel can be better improved.
On the basis of the above embodiment, as an implementation manner of the present invention, optionally, fig. 5 is a schematic structural diagram of another first pixel circuit provided by the embodiment of the present invention, and referring to fig. 5, the first driving module 10 includes a first driving transistor T10; the control terminal of the first driving transistor T10 is used as the control terminal of the first driving module 10, the first terminal of the first driving transistor T10 is used as the first terminal of the first driving module 10, and the second terminal of the first driving transistor T10 is used as the second terminal of the first driving module 10. According to the scheme provided by the embodiment of the invention, the first driving module 10 is only formed by the first driving transistor T10, so that the first driving module 10 is simple in structure, and the first pixel circuit is simple in structure, low in cost and easy to realize.
On the basis of the above embodiment, as an implementation manner of the present invention, optionally, fig. 6 is a schematic structural diagram of another second pixel circuit provided in the embodiment of the present invention, and referring to fig. 6, the second driving module 01 includes a second driving transistor T01; the control end of the second driving transistor T01 is used as the control end of the second driving module 01, the first end of the second driving transistor T01 is used as the first end of the second driving module 01, and the second end of the second driving transistor T01 is used as the second end of the second driving module 01; and the width-to-length ratio of the second driving transistor T01 is the same as that of the first driving transistor T10.
Specifically, the first driving transistor T10 and the second driving transistor T01 are each a thin film transistor (Thin Film Transistor, TFT). The length from the source to the drain of the thin film transistor is the length L of the thin film transistor. When the width of the gate electrode of the thin film transistor is narrower than the width of the channel, the width of the gate electrode of the thin film transistor is the width W of the thin film transistor; when the width of the channel of the thin film transistor is wider than the width of the channel, the width of the channel of the thin film transistor is the width W of the thin film transistor. The width-to-length ratio of the thin film transistor is the ratio of the width W of the thin film transistor to the length L of the thin film transistor, i.e., W/L. When the width-to-length ratio of the thin film transistors is different, the equivalent resistances of the thin film transistors are different, namely the voltage drops of the thin film transistors are different, and the current variation amplitude of the thin film transistors is also different.
The embodiment of the invention sets the width-to-length ratio of the first driving transistor T10 to be the same as the width-to-length ratio of the second driving transistor T01, so that the first driving transistor T10 and the second driving transistor T01 have the same voltage drop, and the first driving transistor T10 and the second driving transistor T01 have the same current variation amplitude. Therefore, when the second display area AA2 is a driving scheme and the number of the first driving transistors T10 disposed in the first pixel circuit is the same as the number of the first light emitting elements D10 connected to the first pixel circuit, that is, when the driving scheme of the first display area AA1 is the same as the driving scheme of the second display area AA2, the width-to-length ratio of the second driving transistors T01 and the width-to-length ratio of the first driving transistors T10 are directly disposed, so that the brightness of the first display area AA1 and the second display area AA2 can be adjusted to be the same through the respective width-to-length ratio adjustment in the display panel, the width-to-length ratio of the first driving transistors T10 in the first pixel circuit and the width-to-length ratio of the second driving transistors T01 in the second pixel circuit are larger, and the brightness of the first display area AA1 and the second display area AA2 cannot be adjusted to be the same, and the brightness of the first display area AA1 and the second display area AA2 are not different.
In addition, the first pixel circuit and the second pixel circuit each further include a storage module 20, a data writing module 30, a compensation module 40, a first initialization module 50, a second initialization module 60, a first light emission control module 70, and a second light emission control module 80. The memory module 20 includes a storage capacitor Cst, the data writing module 30 includes a first transistor T1, the compensation module 40 includes a second transistor T2, the first initialization module 50 includes a third transistor T3, the second initialization module 60 includes a fourth transistor T4, the first light emitting control module 70 includes a fifth transistor T5, and the second light emitting control transistor includes a sixth transistor T6. Illustratively, the first transistor T1 to the sixth transistor T6 are PMOS, and the first driving transistor T10 and the second driving transistor T01 are PMOS, which is not particularly limited in the embodiment of the present invention.
Referring to fig. 4 and 6, in the second pixel circuit, a first end of the memory module 20 is connected to a control end of the second driving module 01, and a second end of the memory module 20 is connected to a first end of the second driving module 01; the first end of the data writing module 30 is connected with the data voltage Vdata, the second end of the data writing module 30 is connected with the first end of the second driving module 01, and the control end of the data writing module 30 is connected with the first scanning signal Scan1; the compensation module 40 is connected between the second end and the control end of the second driving module 01, and the control end of the compensation module 40 is connected with the first scanning signal Scan1; the first end of the first initialization module 50 is connected with an initialization signal Vrefn, the second end of the first initialization module 50 is connected with the control end of the second driving module 01, and the control end of the first initialization module 50 is connected with a second scanning signal Scan2; the first end of the second initialization module 60 is connected to an initialization signal Vrefn, the second end of the second initialization module 60 is connected to the anode of the second light emitting element D01, and the control end of the second initialization module 60 is connected to a second Scan signal Scan2; a first end of the first light emitting control module 70 is connected with a first end of the second driving module 01, a second end of the first light emitting control module 70 is connected with a first power supply ELVDD, and a control end of the first light emitting control module 70 is connected with a light emitting control signal EM; the first end of the second light-emitting control module 80 is connected with the second end of the second driving module 01, the second end of the second light-emitting control module 80 is connected with the anode of the second light-emitting element D01, and the control end of the second light-emitting control module 80 is connected with a light-emitting control signal EM; the cathode of the second light emitting element D01 is connected to the second power ELVSS. Therefore, the second pixel circuit provided by the embodiment of the invention is a 7T1C pixel circuit, which can compensate the threshold voltage of the second driving module 01.
Referring to fig. 1 and 5, similar to the second pixel circuit, in the first pixel circuit, a first end of the memory module 20 is connected to the control end of the first driving module 10, and a second end of the memory module 20 is connected to the first end of the first driving module 10; the first end of the data writing module 30 is connected with the data voltage Vdata, the second end of the data writing module 30 is connected with the first end of the first driving module 10, and the control end of the data writing module 30 is connected with the first scanning signal Scan1; the compensation module 40 is connected between the second end and the control end of the first driving module 10, and the control end of the compensation module 40 is connected to the first Scan signal Scan1; the first end of the first initialization module 50 is connected with an initialization signal Vrefn, the second end of the first initialization module 50 is connected with the control end of the first driving module 10, and the control end of the first initialization module 50 is connected with a second scanning signal Scan2; the first end of the second initialization module 60 is connected to an initialization signal Vrefn, the second end of the second initialization module 60 is connected to the anode of the first light emitting element D10, and the control end of the second initialization module 60 is connected to a second Scan signal Scan2; a first end of the first light emitting control module 70 is connected with a first end of the first driving module 10, a second end of the first light emitting control module 70 is connected with a first power supply ELVDD, and a control end of the first light emitting control module 70 is connected with a light emitting control signal EM; a first end of the second light-emitting control module 80 is connected with a second end of the first driving module 10, a second end of the second light-emitting control module 80 is connected with an anode of the first light-emitting element D10, and a control end of the second light-emitting control module 80 is connected with a light-emitting control signal EM; the cathode of the first light emitting element D10 is connected to the second power source ELVSS. Therefore, the first pixel circuit provided by the embodiment of the invention can be obtained on the basis of the 7T1C pixel circuit.
In addition, the first pixel circuit provided by the embodiment of the invention can be obtained on the basis of the 2T1C pixel circuit. Fig. 7 is a schematic structural diagram of another first pixel circuit according to the embodiment of the present invention, where the first pixel circuit shown in fig. 7 is obtained on the basis of a 2T1C pixel circuit, and the first pixel circuit shown in fig. 7 includes a plurality of first driving modules 10 connected in parallel in addition to the storage module 20 and the data writing module 30, and the first pixel circuit shown in fig. 7 and the first pixel circuit shown in fig. 1 belong to the same inventive concept, so that the same technical effects can be achieved, and the repetition of the description is omitted herein. In other words, the first pixel circuit provided in the embodiment of the present invention may be applicable to any type of pixel circuit, as long as at least two first driving transistors connected in parallel are provided in the pixel circuit.
In one embodiment of the present invention, optionally, the active layers of at least two first driving transistors T10 in the first pixel circuit are arranged in the same layer, and/or the gate metal layers of at least two first driving transistors T10 in the first pixel circuit are arranged in the same layer.
Fig. 8 is a schematic diagram illustrating a top view of the first pixel circuit shown in fig. 5 in a display panel, and fig. 8 illustrates the storage capacitor Cst, the first transistor T1 to the sixth transistor T6, and two first driving transistors T10 connected in parallel. Referring to fig. 8, the active layer S1 of the first driving transistor t10_1 and the active layer S2 of the first driving transistor t10_2 in the first pixel circuit are disposed in the same layer, and the gate M1 of the first driving transistor t10_1 and the gate M2 of the first driving transistor t10_2 are shared, so that the first pixel circuit is simple in structure and easy to implement. In addition, fig. 8 illustrates only one arrangement manner of the first driving transistors t10_1 and t10_2, and the first driving transistors t10_1 and t10_2 may be connected in parallel by other arrangement manners, for example, the arrangement manner of the first driving transistors t10_1 and t10_2 illustrated in fig. 9 is illustrated, which is not limited herein, and fig. 9 is a schematic diagram of a parallel arrangement structure of a plurality of first driving transistors provided in the embodiment of the present invention.
Further, with continued reference to fig. 8, the width W1 and length L1 of the first driving transistor t10_1 are exemplarily illustrated in fig. 8, and the width W2 and length L2 of the sixth transistor T6 are illustrated.
The embodiment of the invention also provides a display device, such as an under-screen camera display device, which comprises the display panel provided by any embodiment. Illustratively, the first display area AA1 of the display panel is disposed in correspondence with a light sensing device in the display apparatus, wherein the light sensing device includes, but is not limited to, a photographing device, such as an under-screen camera. The display device and the display panel in the embodiment of the invention belong to the same inventive concept, can realize the same technical effect, and are not repeated here.
The embodiment of the invention also provides a control method of the display panel, which is used for controlling the display panel provided by any embodiment, and the control method of the display panel comprises the following steps: in the light emitting stage, all the first driving modules 10 in the first pixel circuit are controlled to be turned on, so that each first driving module 10 in the first pixel circuit respectively responds to the data voltage Vdata to generate driving current, and each first light emitting element D10 connected with the first pixel circuit is simultaneously lightened; the second driving module 01 in the second pixel circuit is controlled to be turned on, so that the second driving module 01 in the second pixel circuit generates a driving current in response to the data voltage Vdata, thereby lighting the second light emitting element D01 connected to the corresponding second pixel circuit.
Specifically, the first display area AA1 and the second display area AA2 of the display panel according to the embodiment of the invention may be driven independently or together, and the first pixel circuit and the second pixel circuit may use the same driving timing diagram. Fig. 10 is a timing chart of driving a pixel circuit according to an embodiment of the present invention, which is applicable to driving a first pixel circuit and driving a second pixel circuit. Referring to fig. 5, 6 and 10, the control method of the display panel may include:
initialization phase (period t 1): the second Scan signal Scan2 is controlled to be at a low level, so that the third transistor T3 and the fourth transistor T4 in the first pixel circuit are controlled to be both turned on, the control ends of all the first driving transistors T10 connected in parallel in the first pixel circuit are initialized by the initialization signal Vrefn, and anodes of all the first light emitting elements D10 connected to the first pixel circuit are initialized; at the same time, the third transistor T3 and the fourth transistor T4 in the second pixel circuit are both turned on, and the initialization signal Vrefn initializes the control terminal of the second driving transistor T01 in the second pixel circuit, and initializes the anode of the second light emitting element D01 connected to the second pixel circuit.
Data write and threshold compensation phase (period t 2): the first Scan signal Scan1 is controlled to be at a low level, so that the first transistor T1 and the second transistor T2 in the first pixel circuit are controlled to be both turned on, the data voltage Vdata is written into the control ends of all the first driving transistors T10 connected in parallel in the first pixel circuit, and the second transistor T2 compensates the threshold voltage Vth1 of all the first driving transistors T10 connected in parallel in the first pixel circuit; at the same time, the first transistor T1 and the second transistor T2 in the second pixel circuit are both turned on, the data voltage Vdata is written into the control terminal of the second driving transistor T01 in the second pixel circuit, and the second transistor T2 performs threshold compensation on the threshold voltage Vth2 of the second driving transistor T01 in the second pixel circuit.
Light-emitting phase (t 3 period): the light emission control signal EM is controlled to be at a low level, so that the fifth transistor T5 and the sixth transistor T6 in the first pixel circuit are controlled to be both on, and each first driving transistor T10 in the first pixel circuit generates a driving current in response to the voltage of the control terminal thereof, so that each first light emitting element D10 connected to the first pixel circuit is simultaneously turned on; meanwhile, the fifth transistor T5 and the sixth transistor T6 in the second pixel circuit are both turned on, and the second driving transistor T01 in the second pixel circuit generates a driving current in response to the voltage of the control terminal thereof, thereby lighting the second light emitting element D01 to which the second pixel circuit is connected. Wherein the driving current generated by one first driving transistor T10 in the first pixel circuit in response to the voltage of the control terminal is Ids, when the first pixel circuit comprises N (N is a positive integer) first driving transistors T10 connected in parallel, the current of the output terminal N1 of the first pixel circuit is n×Ids . While W/L is the width-to-length ratio of the first transistor T10, μ is the carrier mobility, C ox A channel capacitance per unit area of the first transistor T10. In addition, the driving current generated by the second driving transistor T01 in response to the voltage of the control terminal thereof can also be Ids, W/L in the corresponding Ids formula is the width-to-length ratio of the first transistor T01, C ox A channel capacitance per unit area of the second transistor T01.
The control method of the display panel provided by the embodiment of the invention belongs to the same inventive concept as the display panel provided by the embodiment of the invention, can realize the same technical effect, and is not repeated here.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. A display panel, which is characterized in that,
the display panel comprises a first pixel circuit and a first light-emitting element, wherein the first pixel circuit comprises at least two first driving modules which are connected in parallel;
the output end of the first pixel circuit is connected with at least two first light-emitting elements, and the at least two first driving modules are used for responding to data voltages to generate driving currents so as to drive the at least two first light-emitting elements connected with the first pixel circuit to emit light;
the display panel further comprises a first display area and a second display area, the light transmittance of the first display area is larger than that of the second display area, and the first light-emitting element is located in the first display area;
the display panel also comprises a second pixel circuit and a second light-emitting element, wherein the second light-emitting element is positioned in the second display area, and the second pixel circuit comprises a second driving module;
the output end of the second pixel circuit is connected with the second light-emitting element, and the second driving module is used for responding to the data voltage to generate driving current so as to drive the second light-emitting element connected with the second pixel circuit to emit light;
At least one device parameter of the second driving module and the first driving module is the same.
2. The display panel according to claim 1, wherein the number of the first driving modules provided in the first pixel circuit is the same as the number of the first light emitting elements to which the first pixel circuit is connected.
3. The display panel of claim 1, wherein first ends of all the first driving modules in the first pixel circuit are connected, second ends of all the first driving modules are connected, and control ends of all the first driving modules are connected.
4. The display panel of claim 1, wherein the first driving module comprises a first driving transistor;
the control end of the first driving transistor is used as the control end of the first driving module, the first end of the first driving transistor is used as the first end of the first driving module, and the second end of the first driving transistor is used as the second end of the first driving module.
5. The display panel of claim 1, wherein the first drive module comprises a first drive transistor and the second drive module comprises a second drive transistor, and wherein at least one device parameter of the second drive module and the first drive module is the same comprises: the second driving transistor has the same width-to-length ratio as the first driving transistor.
6. The display panel of claim 5, wherein a control terminal of the second driving transistor is a control terminal of the second driving module, a first terminal of the second driving transistor is a first terminal of the second driving module, and a second terminal of the second driving transistor is a second terminal of the second driving module.
7. The display panel of claim 5, wherein the first pixel circuit and the second pixel circuit are both located in the second display region.
8. The display panel according to any one of claims 1 to 4, wherein the first driving module includes a first driving transistor;
the active layers of at least two of the first driving transistors in the first pixel circuit are arranged in the same layer, and/or the gate metal layers of at least two of the first driving transistors in the first pixel circuit are arranged in the same layer.
9. A control method of a display panel, characterized by being used for controlling the display panel according to any one of claims 1-8;
the method comprises the following steps:
in the light emitting stage, all the first driving modules in the first pixel circuit are controlled to be conducted so that each first driving module in the first pixel circuit respectively responds to the data voltage to generate driving current, and therefore each first light emitting element connected with the first pixel circuit is lightened simultaneously.
10. A display apparatus comprising a light-sensing device and the display panel according to any one of claims 1 to 8; the first display area is arranged corresponding to the light sensing device.
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