CN109872685B - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN109872685B CN109872685B CN201910273195.XA CN201910273195A CN109872685B CN 109872685 B CN109872685 B CN 109872685B CN 201910273195 A CN201910273195 A CN 201910273195A CN 109872685 B CN109872685 B CN 109872685B
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Abstract
The application discloses a display panel, a manufacturing method thereof and a display device, and belongs to the technical field of display. The display panel includes: a plurality of pixel regions arranged in an array, each pixel region having a plurality of sub-pixels formed therein, the sub-pixels having different emission colors, the sub-pixels including: the pixel circuit comprises a driving device, a light emitting unit and a pixel circuit, wherein the driving device is used for supplying a driving current for driving the light emitting unit to emit light to the light emitting unit; the sub-pixels are electrically connected to a power source terminal, a driving current is obtained based on a power source signal supplied from the power source terminal, and an equivalent resistance ratio of the driving device in the sub-pixel is inversely related to a material light emission life of a material of the light emitting unit in the same sub-pixel. The problem of when drive transistor is lower to the drive current that luminescence unit provided, shorten luminescence unit's life, and then influence display device's life is solved to this application. The application is used for displaying images.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display panel, a manufacturing method thereof, and a display device.
Background
An Organic Light Emitting Diode (OLED) display device has characteristics of self-light emission and low power consumption, and thus is widely used in the display field.
In the related art, the OLED display device includes a plurality of sub-pixels. Each sub-pixel typically comprises: a light emitting unit and a driving transistor. Wherein the driving transistor is electrically connected to the power source terminal and the light emitting unit through wires, respectively. The power supply terminal is used for supplying voltage to the driving transistor; the driving transistor is used for providing a driving current to the light emitting unit so as to drive the light emitting unit to emit light.
When the driving current supplied to the light emitting unit by the driving transistor is low, the aging of the light emitting unit is accelerated, the service life of the light emitting unit is shortened, and the service life of the display device is affected.
Disclosure of Invention
The application provides a display panel, a manufacturing method thereof and a display device, which can solve the problem that the service life of the display device is influenced when the driving current provided by a driving transistor to a light-emitting unit is low in the related art, and the technical scheme is as follows:
in a first aspect, a display panel is provided, the display panel comprising: a plurality of pixel regions arranged in an array, each pixel region having a plurality of sub-pixels formed therein, the sub-pixels having different emission colors, the sub-pixels including: the pixel circuit comprises a driving device, a light emitting unit and a pixel circuit, wherein the driving device is used for providing a driving current for driving the light emitting unit to emit light for the light emitting unit;
the sub-pixels are electrically connected with a power supply end, the driving current is obtained based on a power supply signal provided by the power supply end, the equivalent resistance ratio of a driving device in each sub-pixel is inversely related to the material light-emitting life of a material of a light-emitting unit in the same sub-pixel, the equivalent resistance ratio is the ratio of the equivalent resistance of the driving device in each sub-pixel to the total equivalent resistance, and the total equivalent resistance is the equivalent resistance of a connecting path between the light-emitting unit in each sub-pixel and the power supply end.
Optionally, the display panel further comprises: the wire in the connecting passage has positive correlation between the equivalent resistance of the wire and a target luminous life, and the target luminous life is the material luminous life of the luminous unit connected with the wire.
Optionally, the cross-sectional area of the wire is inversely related to the target light emission lifetime.
Optionally, the width of the wire is inversely related to the target light emitting lifetime, and the direction in which the width of the wire is parallel to the cross section of the wire.
Optionally, the resistivity of the wire is positively correlated with the target luminescence lifetime.
Optionally, the equivalent resistance of the drive devices in the plurality of sub-pixels is the same.
Alternatively, the power supply terminals to which the plurality of sub-pixels are connected supply power signals having the same amplitude.
Optionally, each pixel region includes: a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel emit light of different colors;
the ratio of the first target parameter of the wire between the power supply terminal and the light-emitting unit in the first sub-pixel, the first target parameter of the wire between the power supply terminal and the light-emitting unit in the second sub-pixel, and the first target parameter of the wire between the power supply terminal and the light-emitting unit in the third sub-pixel is: 2:3: 4; the first target parameter is a cross-sectional area or width of the wire;
or, a ratio of the second target parameter of the wire between the power source terminal and the light-emitting unit in the first sub-pixel, the second target parameter of the wire between the power source terminal and the light-emitting unit in the second sub-pixel, and the second target parameter of the wire between the power source terminal and the light-emitting unit in the third sub-pixel is: 4:3: 2; the second target parameter is an equivalent resistance or resistivity of the wire.
In a second aspect, there is provided a method for manufacturing a display panel, the method being used for manufacturing the display panel of the first aspect, the method including:
determining a plurality of pixel regions arranged in an array on a substrate, wherein each pixel region comprises a plurality of sub-pixel regions used for arranging a light-emitting unit and a pixel circuit;
forming a pixel circuit on the substrate, the pixel circuit including: the driving device is used for providing driving current for the light-emitting unit based on a power supply signal provided by a power supply end, the equivalent resistance ratio of the driving device in the sub-pixel is inversely related to the light-emitting service life of the material of the light-emitting unit in the same sub-pixel, the equivalent resistance ratio is the ratio of the equivalent resistance of the driving device to the total equivalent resistance, and the total equivalent resistance is the equivalent resistance of a connecting path between the driving device and the power supply end;
a light emitting unit is formed on the base substrate on which the pixel circuit is formed.
In a third aspect, there is provided a display device, the device comprising: the display panel of the first aspect.
The beneficial effect that technical scheme that this application provided brought includes at least:
in the application, each sub-pixel comprises a light emitting unit and a pixel circuit, each pixel circuit comprises a driving device, the equivalent resistance ratio of the driving device is in negative correlation with the material light emitting life of the light emitting unit in the same sub-pixel, and compared with the related technology, the service life of the light emitting unit determined by the driving current and the service life of the light emitting unit determined by the material are in negative correlation, so that the service lives of the sub-pixels with different colors in the same pixel region can be the same as much as possible, and the service life of the display device is ensured.
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 are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pixel region according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pixel region according to an embodiment of the invention;
FIG. 4 is a cross-sectional view of a wire provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another pixel region according to an embodiment of the invention;
FIG. 6 is a flowchart illustrating a method for manufacturing a display panel according to an embodiment of the present invention;
FIG. 7 is a flow chart of another method for manufacturing a display panel according to an embodiment of the present invention;
fig. 8 is a schematic partial structure diagram of a display panel according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a mask according to an embodiment of the present invention;
fig. 10 is a schematic partial structure diagram of another display panel according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The lifetime of the light-emitting unit in the sub-pixel is determined by the emission lifetime of the material of which the light-emitting unit is made and the driving current supplied to the light-emitting unit. The material emission lifetime of the light-emitting unit is the time length of the light-emitting unit capable of emitting light normally, which is determined by the properties of the material used to manufacture the light-emitting unit, i.e. the material emission lifetimes of different light-emitting units manufactured from the same material are the same. The influence of the driving current on the service life of the light emitting unit is shown as follows: when different driving currents are respectively supplied to different light emitting units made of the same material, the more the supplied driving current is close to a current reference value for enabling the light emitting units to normally emit light, the longer the service life of the corresponding light emitting unit determined by the driving current is. Accordingly, the longer the lifetime of the light emitting unit is determined by the material and the driving current. The reference value of the current for making the light emitting unit emit light normally may be a numerical value or a numerical range, which is not distinguished in the embodiment of the present invention.
The principle that the driving current affects the service life of the light emitting unit is as follows: when the driving current supplied to the light emitting cell is not equal to the current reference value, the light emitting cell aging is accelerated. When it ages to a certain degree, the light-emitting unit cannot emit light normally, i.e., the luminance of the light-emitting unit cannot reach the desired luminance. That is, when the driving current supplied to the light emitting unit is not equal to the current reference value, the total time period for which the light emitting unit can normally emit light is reduced, that is, the lifetime of the light emitting unit determined by the current is shortened. Herein, when the current reference value is a numerical range, the driving current not being equal to the current reference value means that the driving current does not lie within the numerical range.
The display device may include a plurality of pixel regions, as shown in fig. 1, each of which may include: red, green, and blue sub-pixels. Each sub-pixel includes: a driving transistor M and a light emitting unit 121. The gate of the driving transistor M is connected to the control signal terminal 15, the first stage of the driving transistor M is connected to the power terminal 13, the second stage of the driving transistor M is connected to one terminal of the light emitting unit 121, and the other terminal of the light emitting unit 121 is connected to the ground terminal 16. The driving transistor M and the power terminal 13, and the driving transistor M and the light emitting unit 121 are connected through a wire 14.
In the related art, the resistances of the wires connecting different driving transistors are the same, the total resistances of the wires for connecting the driving transistors with the light emitting units, and the wires for connecting the driving transistors with the power source terminals are the same. When the voltages supplied from the power supply terminals to each of the sub-pixels are the same, the voltage drop on the conductive lines corresponding to each of the sub-pixels is the same, so that the voltage drop of the driving transistor in each of the sub-pixels is also the same. At this time, the driving transistors in different sub-pixels provide the same driving current, and accordingly, the light emitting units in different sub-pixels have the same service life determined by the driving current.
In the related art, the emission lifetimes of the red, green, and blue sub-pixels are different due to the material, and the emission lifetime of the blue sub-pixel is the shortest due to the material, and at this time, the lifetime of the pixel unit is determined by the emission lifetime of the blue sub-pixel due to the material, and the red and green sub-pixels in the display device cannot be fully utilized, resulting in a shorter lifetime of the display device.
Embodiments of the present invention provide a display panel, which can solve the above problems. Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and as shown in fig. 2, the display panel 1 may include: the display device comprises a plurality of pixel regions 11 arranged in an array, wherein a plurality of sub-pixels 12 are formed in each pixel region 11, and the light emitting colors of the sub-pixels 12 are different.
The sub-pixel 12 may include: a light emitting unit 121, and a pixel circuit 122, the pixel circuit 122 may include a driving device 1221, and the driving device 1221 is configured to provide a driving current for driving the light emitting unit 121 to emit light to the light emitting unit 121.
The sub-pixels are electrically connected to a power supply terminal 13. For example, as shown in fig. 2, the driving devices 1221 in the sub-pixels may be electrically connected to the power source terminals 13 and the light emitting units 121 through wires 14, respectively. The power source terminal is used to provide a power signal to the driving device 1221, and the driving current provided by the driving device 1221 to the light emitting unit 121 may be derived based on the power signal. Illustratively, the power supply signal may be a voltage.
Also, the equivalent resistance duty ratio of the driving device 1221 in a subpixel 12 is inversely related to the material emission lifetime of the light emitting unit 121 in the same subpixel 12. The equivalent resistance ratio is a ratio of the equivalent resistance of the driving device 1221 to the total equivalent resistance. The total equivalent resistance is an equivalent resistance of a connection path between the light emitting unit 121 and the power source terminal 13. For example, the total equivalent resistance may be equal to the sum of the equivalent resistance of the wire 14 between the light emitting unit 121 and the power source terminal 13 and the equivalent resistance of the driving device 1221.
The equivalent resistance ratio of the driving device 1221 in a sub-pixel 12 is inversely related to the emission lifetime of the material of the light-emitting unit 121 in the same sub-pixel, that is, in the same sub-pixel 12, the smaller the emission lifetime of the material of the light-emitting unit 121, the larger the equivalent resistance ratio of the driving device 1221. When the equivalent resistance ratio of the driving device 1221 is larger, the voltage drop ratio across the driving device 1221 is larger, and the driving device 1221 is aged relatively slowly, so that the total time period for which the driving device 1221 can supply the driving current equal to the current reference value to the light emitting unit is longer.
As the total duration of the driving current, which is equal to the current reference value, supplied to the light emitting unit 121 by the driving device 1221 is longer, the total duration of the light emitting unit 121 capable of normally emitting light is longer, and accordingly, the lifetime of the light emitting unit determined by the driving current is longer. It can be deduced that: the service life of the light-emitting unit determined by the driving current is in positive correlation with the equivalent resistance ratio of the driving device in the same sub-pixel.
Since the material light emitting life of the light emitting unit is inversely related to the equivalent resistance of the driving device in the same sub-pixel, the service life of the light emitting unit determined by the driving current and the service life of the light emitting unit determined by the material are in a negative correlation relationship. In addition, since the service life of the light emitting unit is determined by the emission life of the material for manufacturing the light emitting unit and the driving current supplied to the light emitting unit, the influence of the material on the service life and the influence of the driving current on the service life can be mutually compensated for the same sub-pixel, so that the service lives of the sub-pixels with different colors in the same pixel region can be the same as much as possible, and the light emitting unit with longer emission life of the material determined by the material can be effectively utilized.
In summary, in the embodiments of the present invention, the sub-pixel includes a light emitting unit and a pixel circuit, the pixel circuit includes a driving device, an equivalent resistance ratio of the driving device is inversely related to a material light emitting life of the light emitting unit in the same sub-pixel, and compared with the related art, a service life of the light emitting unit determined by a driving current and a service life of the light emitting unit determined by a material are inversely related to each other, so that service lives of sub-pixels of different colors in the same pixel region can be the same as much as possible, and a service life of the display device is ensured.
Alternatively, the driving device 1221 may be a driving transistor, and the driving transistor may be a polysilicon transistor. As shown in fig. 2, the display panel 1 may further include: a control signal terminal 15 and a ground terminal 16. At this time, the gate of the driving transistor is electrically connected to the control signal terminal 15, the source of the driving transistor is electrically connected to the power terminal 13, the drain of the driving transistor is electrically connected to one end of the light emitting unit 121, and the other end of the light emitting unit 121 is electrically connected to the ground terminal 16. The power supply terminals connected to different sub-pixels may be the same or different, and when different sub-pixels are connected to different power supply terminals, the power supply signals provided by the respective connected power supply terminals may also be the same or different. Fig. 1 and fig. 2 are schematic diagrams illustrating different power source terminals connected to different sub-pixels.
Alternatively, the realizable manner in which the equivalent resistance ratio of the driving device in a subpixel is inversely related to the emission lifetime of the material of the light-emitting unit in the same subpixel may have various. In one implementation, the difference in the equivalent resistance ratios of the driving devices in different sub-pixels can be represented by the equivalent resistance of the power supply terminal and the wire between the light-emitting unit and the power supply terminal in the sub-pixel. For example, the equivalent resistance of the wire between the power source terminal and the light emitting unit in any one of the sub-pixels may positively correlate with the target light emitting life. The target light emitting life is a material light emitting life of the light emitting unit to which the wire is connected.
The equivalent resistance of the wire between the light-emitting unit and the power supply terminal is positively correlated with the target light-emitting life. At this time, in the same subpixel, the smaller the emission lifetime of the material of the light emitting unit, the smaller the equivalent resistance of the wire between the light emitting unit and the power source terminal, the relatively larger the equivalent resistance of the driving device, and accordingly, the larger the equivalent resistance ratio of the driving device. Therefore, it can be realized that the equivalent resistance ratio of the driving device is inversely related to the material light emission life of the light emitting unit in the same subpixel.
Further, there are various cases where the equivalent resistance of the wire between the power source terminal and the light emitting unit is positively correlated with the target light emitting life, and the embodiments of the present invention will be described with reference to the following cases as examples.
In the first case, the positive correlation between the equivalent resistance of the wire and the target light emission life can be represented by the negative correlation between the cross-sectional area of the wire and the target light emission life.
The equivalent resistance R of the wire and the cross-sectional area S of the wire 14 satisfy: where ρ represents the resistivity of the wire and l represents the length of the wire. From this relationship, it can be seen that when the resistivity and length of the wire are constant, the equivalent resistance of the wire is inversely related to the cross-sectional area of the wire, i.e., the larger the cross-sectional area of the wire, the smaller the equivalent resistance of the wire. Therefore, when the cross-sectional area of the wire is negatively correlated with the target light emission life, the equivalent resistance of the wire is positively correlated with the target light emission life.
For example, fig. 3 is a schematic structural diagram of a pixel region according to an embodiment of the present invention, and as shown in fig. 3, the pixel region 11 may include: the first sub-pixel 12a, the second sub-pixel 12b, and the third sub-pixel 12c, and the emission colors of the first sub-pixel 12a, the second sub-pixel 12b, and the third sub-pixel 12c are different from each other. The material emission lifetime of the light-emitting unit in the first sub-pixel 12a, the material emission lifetime of the light-emitting unit in the second sub-pixel 12b, and the material emission lifetime of the light-emitting unit in the third sub-pixel 12c decrease in this order. The cross-sectional area of the wire 14 between the power source terminal and the light-emitting unit in the first subpixel 12a, the cross-sectional area of the wire 14 between the power source terminal and the light-emitting unit in the second subpixel 12b, and the cross-sectional area of the wire 14 between the power source terminal and the light-emitting unit in the third subpixel 12c increase in this order, and at this time, the resistance of the wire 14 between the power source terminal and the light-emitting unit in the first sub-pixel 12a, the resistance of the wire 14 between the power source terminal and the light-emitting unit in the second sub-pixel 12b, and the resistance of the wire 14 between the power source terminal and the light-emitting unit in the third sub-pixel 12c decrease in this order, therefore, the lifetime of the light emitting unit 121 determined by the driving current and the lifetime of the light emitting unit 121 determined by the material show a negative correlation, further, the service lives of the three types of sub-pixels in the pixel region 11 can be made as equal as possible, and the first sub-pixel 12a and the second sub-pixel 12b can be effectively used.
Further, the relationship that the cross-sectional area of the wire is inversely related to the target light emission lifetime may be expressed by a negative correlation between the width of the wire and the target light emission lifetime.
As shown in fig. 4, the conductive line 14 has a width W and a thickness H, and the cross-sectional area of the conductive line is the product of the width and the thickness. When forming the conductive lines, a conductive layer with a certain thickness is usually formed on a substrate (or on a substrate on which other film layers are formed), and then the conductive layer is processed by a patterning process to obtain the conductive lines with a certain pattern. At this time, the width of the conductive line may be in a direction parallel to the contact surface of the substrate (or other film layers) and perpendicular to the extending direction of the conductive line, and accordingly, the thickness of the conductive line may be the thickness of the conductive layer. The width of the conductive line may also be referred to as a line width of the conductive line.
Since the conductive lines in the display device are formed by one patterning process, the thickness of the conductive lines corresponding to different sub-pixel units is the same, and thus, the cross-sectional area of the conductive lines is positively correlated with the width W of the conductive lines 14. Therefore, when the width W of the wire 14 is negatively correlated with the target light emission lifetime, the cross-sectional area of the wire 14 is negatively correlated with the target light emission lifetime.
Alternatively, when the thicknesses of the wires corresponding to different sub-pixel units are different, the negative correlation between the cross-sectional area of the wire and the target light-emitting life can also be expressed by the negative correlation between the thickness of the wire and the target light-emitting life. For example, in the case where the width of the wire is constant, when the thickness of the wire is negatively correlated with the target light emission lifetime, it can be achieved that the cross-sectional area of the wire is negatively correlated with the target light emission lifetime.
Alternatively, the ratio of the first target parameter of the wire 14 between the power source terminal and the light-emitting unit in the first sub-pixel 12a, the first target parameter of the wire 14 between the power source terminal and the light-emitting unit in the second sub-pixel 12b, and the first target parameter of the wire 14 between the power source terminal and the light-emitting unit in the third sub-pixel 12c may be 2:3: 4. The first target parameter may be, among others, the cross-sectional area, width or thickness of the wire 14.
For example, the first subpixel may be a red subpixel, the second subpixel may be a green subpixel, and the third subpixel may be a blue subpixel. At this time, the width of the wire 14 between the power source terminal and the light emitting unit in the red sub-pixel may be 0.2 mm; the width of the wire 14 between the power source terminal and the light emitting unit in the green subpixel may be 0.3 mm; the width of the wire 14 between the power source terminal and the light emitting unit in the blue subpixel may be 0.4 mm.
In the second case, the positive correlation between the equivalent resistance of the wire and the target light emission life can be represented by the positive correlation between the resistivity of the wire and the target light emission life.
The equivalent resistance R of the wire 14 and the resistivity ρ of the wire 14 satisfy: r ═ p × l)/S. From the relation, it can be seen that when the cross-sectional area and the length of the wire are fixed, the equivalent resistance of the wire is positively correlated with the resistivity of the wire, i.e. the larger the resistivity of the wire is, the larger the equivalent resistance of the wire is. Therefore, when the resistivity of the wire is positively correlated with the target light emission life, the equivalent resistance of the wire is positively correlated with the target light emission life.
Further, since the resistivity of the conductive wire is determined by the material of the conductive wire, the conductive wires corresponding to the sub-pixels of different colors are made of different materials, and accordingly, the resistivity of the conductive wires corresponding to the sub-pixels of different colors is different. For example, for a first sub-pixel, a second sub-pixel and a third sub-pixel, which have the emission lifetimes of the materials of the light-emitting unit reduced in sequence, the resistivity of the material of the wire corresponding to the first sub-pixel, the resistivity of the material of the wire corresponding to the second sub-pixel and the resistivity of the material of the wire corresponding to the third sub-pixel may be reduced in sequence, so that the lifetime of the light-emitting unit determined by the driving current and the lifetime of the light-emitting unit determined by the material are in a negative correlation relationship, and thus the lifetimes of the three sub-pixels may be the same as much as possible, and the first sub-pixel and the second sub-pixel may be effectively used. The conducting wire corresponding to the sub-pixel refers to a conducting wire between a power supply end and a light emitting unit in the sub-pixel.
In the third case, the positive correlation between the equivalent resistance of the wire and the target light emission life can be represented by the positive correlation between the length of the wire and the target light emission life.
The equivalent resistance R of the wire and the length l of the wire 14 satisfy: r ═ p × l)/S. From the relation, it can be seen that when the cross-sectional area and the resistivity of the wire are constant, the equivalent resistance of the wire is positively correlated with the length of the wire, i.e. the longer the length of the wire is, the larger the equivalent resistance of the wire is. Therefore, when the length of the wire is positively correlated with the target light emission life, the equivalent resistance of the wire is positively correlated with the target light emission life.
For example, on the premise that it is ensured that both the power source terminal and the driving device, and the driving device and the light emitting unit can be electrically connected, for the first sub-pixel, the second sub-pixel, and the third sub-pixel in which the material light emitting life of the light emitting unit is sequentially reduced, the length of the wire between the power source terminal and the light emitting unit in the first sub-pixel, the length of the wire between the power source terminal and the light emitting unit in the second sub-pixel, and the length of the wire between the power source terminal and the light emitting unit in the third sub-pixel may be sequentially reduced. Therefore, the service life of the light-emitting unit determined by the driving current and the service life of the light-emitting unit determined by the material are in a negative correlation relationship, the service lives of the three sub-pixels can be the same as much as possible, and the first sub-pixel and the second sub-pixel can be effectively utilized.
Illustratively, the ratio of the second target parameter of the wire 14 between the power source terminal and the light-emitting unit in the first subpixel 12, the second target parameter of the wire 14 between the power source terminal and the light-emitting unit in the second subpixel 12, and the second target parameter of the wire 14 between the power source terminal and the light-emitting unit in the third subpixel 12 may be 4:3: 2. Wherein the second target parameter may be an equivalent resistance, resistivity or length of the wire 14.
Wherein when the equivalent resistance of the wire between the power source terminal and the light emitting unit in any one of the sub-pixels is positively correlated with the target light emission life, the equivalent resistances of the driving devices in the plurality of sub-pixels may be the same or different. Also, when the equivalent resistances of the driving devices are the same in the plurality of sub-pixels, the equivalent duty ratio of the driving devices may be determined by the equivalent resistance of the wire between the power source terminal and the light emitting unit. I.e., the smaller the equivalent resistance of the wire between the power source terminal and the light emitting unit, the larger the equivalent duty ratio of the driving device.
Further, when the equivalent resistance of the driving devices in the plurality of sub-pixels is the same, the configuration of the driving devices in the plurality of sub-pixels may be the same, and thus, the manufacturing process of the driving transistors in the plurality of sub-pixels may be simultaneously performed in the manufacturing process of the display device, and the manufacturing process of the display device may be simplified.
Optionally, as shown in fig. 5, the pixel circuit 122 may further include: the switching transistor 1222, at this time, the total equivalent resistance of the sub-pixel 12 may be equal to the sum of the equivalent resistance of the wire 14 between the light emitting unit 121 and the power source terminal 13 in the sub-pixel 12, the equivalent resistance of the driving transistor 1221, and the equivalent resistance of the switching transistor 1222. The first stage of the driving transistor 1221 may be electrically connected to a power source terminal through the switching transistor 1222. Illustratively, the gate of the switching transistor 1222 is electrically connected to the control signal terminal 15, the first stage of the switching transistor 1222 is electrically connected to the power terminal 13, and the second stage of the switching transistor 1222 is electrically connected to the first stage of the driving transistor 1221. The switching transistor 1222 has two states of being turned on and off. When the switching transistor 1222 is in a turned-on state, a power supply signal of the power source terminal 13 can be input to the first stage of the driving transistor 1221 through the switching transistor 1222 to supply the power supply signal to the driving transistor 1221; when the switch transistor 1222 is in an off state, the power supply signal of the power source terminal 13 cannot be input to the first stage of the driving transistor 1221 through the switch transistor 1222, and the power supply signal cannot be supplied to the driving transistor 1221. Wherein the first stage of the driving transistor 1221 may be a source of the driving transistor 1221, and the second stage of the driving transistor 1221 may be a drain of the driving transistor 1222; the first stage of the switching transistor may be a source of the switching transistor and the second stage of the switching transistor may be a drain of the switching transistor.
When it is required to control the light emitting unit 121 to emit light, a control signal may be first input to the gate of the switching transistor 1222 and the gate of the driving transistor 1221 to control the switching transistor 1222 and the driving transistor 1221 to be turned on, and at this time, a power signal of the power terminal 13 may be input to the first stage of the driving transistor 1221 through the switching transistor 1222, and a driving current may be input to the light emitting unit through the second terminal of the driving transistor 1221, so that the light emitting unit 121 emits light under the action of the driving current.
Alternatively, with continued reference to fig. 5, the pixel circuit may have two switching transistors, in which case, the two switching units are connected in series between the power source terminal and the light emitting unit, and the gates of the two switching transistors are electrically connected to the same control signal terminal 18, which is different from the control signal terminal 15 connected to the gate of the driving transistor.
In summary, in the embodiments of the present invention, the sub-pixel includes a light emitting unit and a pixel circuit, the pixel circuit includes a driving device, and an equivalent resistance ratio of the driving device is inversely related to a material light emitting life of the light emitting unit in the same sub-pixel.
Fig. 6 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention. The manufacturing method of the display panel is used for manufacturing the display panel provided by the embodiment of the application. As shown in fig. 6, the method of manufacturing the display panel may include:
The equivalent resistance ratio is the ratio of the equivalent resistance of the driving device to the total equivalent resistance, and the total equivalent resistance is the equivalent resistance of a connecting path between the driving device and the power supply end.
In summary, in the manufacturing method of the display panel according to the embodiment of the invention, after the plurality of pixel units arranged in an array are determined, the pixel circuit is formed on the substrate, and then the light emitting unit is formed on the substrate on which the pixel circuit is formed, so as to obtain the sub-pixel composed of the light emitting unit and the pixel circuit, the pixel circuit includes the driving device, and the equivalent resistance duty ratio of the driving device is inversely related to the light emitting life of the material of the light emitting unit in the same sub-pixel.
Fig. 7 is a flowchart of another method for manufacturing a display panel according to an embodiment of the present invention, and as shown in fig. 7, the method for manufacturing a display panel may include:
As shown in fig. 8, a plurality of pixel regions 11 may be defined on the substrate base 17 according to actual needs.
A layer of conductive material with a certain thickness can be deposited on the substrate by magnetron sputtering, thermal evaporation or Plasma Enhanced Chemical Vapor Deposition (PECVD) or the like to obtain a conductive layer, and then the conductive layer is processed by a composition process to obtain the lead. Wherein the patterning process may include: photoresist coating, exposure, development, etching and photoresist stripping. The thickness of the conductive material can be adjusted according to actual needs, for example: the conductive material may have a thickness in the range of 3000 angstroms to 5000 angstroms.
When the conductive layer is processed by the composition process to form the conductive line, the photoresist can be exposed by adopting a mask, the exposed photoresist is developed, the developed photoresist is utilized to etch the conductive layer, and the photoresist is stripped to obtain the conductive line. The mask plate may have a plurality of openings thereon, and the plurality of openings may be used for forming the conductive lines on the substrate. Also, when the widths of the conductive lines to be formed on the base substrate are the same, the sizes of the openings for forming the conductive lines are the same. When the widths of the conducting wires to be formed are different, the sizes of the openings corresponding to the conducting wires with different widths are different, and the sizes of the openings are positively correlated with the widths of the conducting wires. For example, the width of the conductive line may be equal to the width of the opening.
Alternatively, when the widths of the conductive lines are different, step 702 may have a plurality of realizations, and the following realizations will be taken as examples to illustrate the embodiments of the present invention.
In one implementation, the conductive lines with different widths can be formed by using one mask, and the one mask has a plurality of openings with different sizes. In this case, the conductive lines having different widths may be formed by one patterning process, thereby simplifying the manufacturing process of the display panel.
For example, when the display panel includes three wires with different widths as shown in fig. 3, as shown in fig. 9, the mask Y may have an opening M1, an opening M2, and an opening M3 thereon, and the opening sizes of the opening M1, the opening M2, and the opening M3 are sequentially increased. Among them, the opening M1 is used to manufacture the wire with the smallest width, the wire manufactured according to it may be the narrowest wire 141 in fig. 10, the opening M2 is used to manufacture the wire with larger width, the wire manufactured according to it may be the wider wire 142 in fig. 10, the opening M3 is used to manufacture the wire with the widest width, and the wire manufactured according to it may be the wire 143 in fig. 10.
In another implementation manner, a plurality of masks can be used to form the wires with different widths, each mask is provided with a plurality of openings, the openings in the same mask are the same in size, and the openings in different masks are different in size. At this time, each mask is used to form a conducting wire with one width, for example, the mask with the largest opening can be used to form the conducting wire with the widest width, and a plurality of conducting wires with different widths can be formed by adopting a plurality of masks respectively.
Illustratively, as shown in fig. 10, the display panel includes three conductive lines with different widths, namely a narrowest conductive line 141, a wider conductive line 142, and a widest conductive line 143. At this time, three masks may be respectively used to expose the photoresist three times, develop the exposed photoresist, and etch the conductive layer with the developed photoresist to obtain three wires with different widths. For example, a three-exposure process may include: the method comprises the steps of firstly adopting a mask plate with the smallest opening to expose the photoresist, then adopting a mask plate with a larger opening to expose the photoresist for the second time, and adopting a mask plate with the largest opening to expose the photoresist for the third time.
It should be noted that the driver device may be a driving transistor, and the driving transistor may include a gate electrode, a gate insulating layer, an active layer, and a source/drain pattern. The gate electrode, the gate insulating layer and the active layer may be formed before the conductive line is manufactured, and the source and drain patterns may be formed together with the conductive line in a single patterning process.
After the driving device in the pixel circuit is formed, a light emitting unit may be formed on the base substrate to obtain a display panel. Wherein the light emitting unit may include: an anode, a light-emitting layer, a cathode, and the like. The light emitting layer may include: hole injection layers, hole transport layers, light emitting material layers, electron transport layers, electron injection layers, and the like.
In summary, in the manufacturing method of the display panel according to the embodiment of the invention, after the plurality of pixel units arranged in an array are determined, the pixel circuit is formed on the substrate, and then the light emitting unit is formed on the substrate on which the pixel circuit is formed, so as to obtain the sub-pixel composed of the light emitting unit and the pixel circuit, the pixel circuit includes the driving device, and the equivalent resistance duty ratio of the driving device is inversely related to the light emitting life of the material of the light emitting unit in the same sub-pixel.
It should be noted that, the sequence of the steps of the manufacturing method of the display panel provided in the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the situation. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and thus, the detailed description thereof is omitted.
An embodiment of the present invention provides a display device, which may include: the display panel 1 in the above embodiment.
Optionally, the display device may be: the display device comprises any product or component with a display function, such as a liquid crystal panel, electronic paper, a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A display panel, comprising: a plurality of pixel regions arranged in an array, each pixel region having a plurality of sub-pixels formed therein, the sub-pixels having different emission colors, the sub-pixels including: the pixel circuit comprises a driving device, a light emitting unit and a pixel circuit, wherein the driving device is used for providing a driving current for driving the light emitting unit to emit light for the light emitting unit;
the sub-pixel is electrically connected with a power supply end, the driving current is obtained based on a power supply signal provided by the power supply end, and the equivalent resistance ratio of the driving device in the sub-pixel is inversely related to the material light-emitting life of the material of the light-emitting unit in the same sub-pixel, so that the service life of the light-emitting unit in the sub-pixel, which is determined by the driving current, is positively related to the equivalent resistance ratio of the driving device in the same sub-pixel, the material light-emitting life refers to the time length of normal light emission of the light-emitting unit, which is determined by the manufacturing material of the light-emitting unit, the equivalent resistance ratio is the ratio of the equivalent resistance of the driving device in the sub-pixel to the total equivalent resistance, and the total equivalent resistance is the equivalent resistance of a connection path between the light-.
2. The display panel according to claim 1, characterized in that the display panel further comprises: the wire in the connecting passage has positive correlation between the equivalent resistance of the wire and a target luminous life, and the target luminous life is the material luminous life of the luminous unit connected with the wire.
3. The display panel according to claim 2, wherein a cross-sectional area of the wire is inversely related to the target light emission lifetime.
4. The display panel according to claim 3, wherein the width of the conductive line is inversely related to the target light emission lifetime, and the width of the conductive line is in a direction parallel to a cross section of the conductive line.
5. The display panel according to claim 2, wherein the resistivity of the wire is positively correlated with the target light emission lifetime; or, the length of the wire is positively correlated with the target luminous life.
6. The display panel according to any one of claims 1 to 5, wherein equivalent resistances of the driving devices in the plurality of sub-pixels are the same.
7. The display panel according to any one of claims 1 to 5, wherein the power supply terminals connected to the plurality of sub-pixels supply power signals having the same amplitude.
8. The display panel according to any one of claims 2 to 5, wherein each of the pixel regions includes: a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel emit light of different colors;
the ratio of the first target parameter of the wire between the power supply terminal and the light-emitting unit in the first sub-pixel, the first target parameter of the wire between the power supply terminal and the light-emitting unit in the second sub-pixel, and the first target parameter of the wire between the power supply terminal and the light-emitting unit in the third sub-pixel is: 2:3: 4; the first target parameter is a cross-sectional area or width of the wire;
or, a ratio of the second target parameter of the wire between the power source terminal and the light-emitting unit in the first sub-pixel, the second target parameter of the wire between the power source terminal and the light-emitting unit in the second sub-pixel, and the second target parameter of the wire between the power source terminal and the light-emitting unit in the third sub-pixel is: 4:3: 2; the second target parameter is an equivalent resistance or resistivity of the wire.
9. A method for manufacturing a display panel, characterized by being used for manufacturing the display panel according to any one of claims 1 to 8, the method comprising:
determining a plurality of pixel regions arranged in an array on a substrate, wherein each pixel region comprises a plurality of sub-pixel regions used for arranging a light-emitting unit and a pixel circuit;
forming a pixel circuit on the substrate, the pixel circuit including: the driving device is used for providing driving current for the light-emitting unit based on a power supply signal provided by a power supply end, the equivalent resistance ratio of the driving device in the sub-pixel is inversely related to the light-emitting service life of the material of the light-emitting unit in the same sub-pixel, the equivalent resistance ratio is the ratio of the equivalent resistance of the driving device to the total equivalent resistance, and the total equivalent resistance is the equivalent resistance of a connecting path between the driving device and the power supply end;
a light emitting unit is formed on the base substrate on which the pixel circuit is formed.
10. A display device, characterized in that the display device comprises: the display panel of any one of claims 1 to 8.
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