CN115867087B

CN115867087B - Pixel structure and display panel

Info

Publication number: CN115867087B
Application number: CN202211670397.6A
Authority: CN
Inventors: 蒲洋; 康报虹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-09-01
Anticipated expiration: 2042-12-23
Also published as: CN115867087A

Abstract

The application belongs to the technical field of display, and particularly relates to a pixel structure and a display panel, wherein the pixel structure receives different data voltages through a first pole of an electrophoresis driving capacitor, and controls the positions of electrophoresis particles in the first pole and a second pole, so that the electrophoresis particles can be controlled to block or not block the luminescence of an organic light-emitting element; when the electrophoretic particles are dispersed in the opening area of the pixel structure, the electrophoretic particles partially shield the light emergent side of the organic light-emitting element, but the display is not affected, so that the light emitted by the organic light-emitting element is partially shielded by the electrophoretic particles, and the display panel is in low-brightness display, and the display panel is not required to be in low-brightness display in an alternating mode of bright screen and dark screen, so that discomfort to human eyes is avoided; when the electrophoretic particles are positioned in the non-opening area of the pixel structure, the electrophoretic particles do not shade the light emitting side of the organic light emitting element, so that the display panel is in a high-brightness display state.

Description

Pixel structure and display panel

Technical Field

The application belongs to the technical field of display, and particularly relates to a pixel structure and a display panel.

Background

An Organic Light-Emitting Diode (OLED) display device has excellent characteristics of self-luminescence, no backlight source, high contrast, thin thickness, wide viewing angle, fast reaction speed, applicability to flexible panels, wide use temperature and the like, and is recognized as a mainstream technology of next-generation display, so that the OLED display device is favored by various display manufacturers at home and abroad.

However, the light emission wavelength of the display material of the conventional organic light emitting diode is changed due to the fact that the current is too small under the condition of low current and low light emission brightness, so that color cast is generated. At present, the organic light emitting diode often uses PWM (pulse width modulation) to obtain low brightness, but this mode may cause the display panel to have alternating on and off, which causes discomfort to human eyes.

Disclosure of Invention

The application aims to provide a pixel structure and a display panel, which can enable the display panel to obtain low-brightness display and avoid the problem of discomfort to human eyes caused by PWM (pulse width modulation).

The first aspect of the present application provides a pixel structure, including an organic light emitting element, a data terminal, a power positive terminal, and a power negative terminal, wherein a cathode of the organic light emitting element is connected to the power negative terminal, and the pixel structure further includes:

A current compensation terminal and an electrophoresis driving terminal;

the pixel driving module is connected with the data end, the positive electrode end of the power supply and the anode of the organic light-emitting element;

the current compensation module is connected with the data end, the current compensation end and the anode;

the electrophoresis driving module comprises an electrophoresis driving capacitor and an electrophoresis switching unit, wherein the electrophoresis driving capacitor comprises a first pole, a second pole and electrophoresis particles positioned between the first pole and the second pole, the electrophoresis particles are positioned on the light emitting side of the organic light emitting element, the first pole is connected with the data end, the second pole is connected with the negative electrode end of the power supply, and the electrophoresis switching unit is connected with the data end, the electrophoresis driving end and the first pole; wherein, when the data terminal receives the high brightness data voltage: the pixel driving module controls the conduction between the positive electrode end of the power supply and the anode, the current compensation module controls the disconnection between the current compensation end and the anode, the electrophoresis switch unit controls the disconnection between the electrophoresis driving end and the first electrode, a first electric field is formed between the first electrode and the second electrode, and electrophoresis particles are gathered in a non-opening area of the pixel structure under the action of the first electric field;

When the data terminal receives a low brightness data voltage: the pixel driving module controls conduction between the positive electrode end of the power supply and the anode, the current compensation module controls conduction between the current compensation end and the anode, the electrophoresis switch unit controls conduction between the electrophoresis driving end and the first electrode, a second electric field is formed between the first electrode and the second electrode, and electrophoresis particles are dispersed in an opening area of the pixel structure under the action of the second electric field.

In one exemplary embodiment of the present application, the pixel driving module includes a driving transistor, a storage capacitor, and a first switching transistor;

the first end of the driving transistor is connected with the positive electrode end of the power supply, and the second end of the driving transistor is connected with the anode;

the first end of the storage capacitor is connected with the positive electrode end of the power supply, and the second end of the storage capacitor is connected with the control end of the driving transistor;

the first end of the first switch transistor is connected with the data end, the second end of the first switch transistor is connected with the control end of the driving transistor, and the control end of the first switch transistor is connected with the first scanning signal end.

In an exemplary embodiment of the present application, the current compensation module includes a current compensation transistor, a first terminal of the current compensation transistor is connected to the current compensation terminal, a second terminal of the current compensation transistor is connected to an anode of the organic light emitting element, and a control terminal of the current compensation transistor is connected to the data terminal;

the electrophoresis switch unit comprises an electrophoresis drive transistor, a first end of the electrophoresis drive transistor is connected with the electrophoresis drive end, a second end of the electrophoresis drive transistor is connected with the first electrode, and a control end of the electrophoresis drive transistor is connected with the data end.

In an exemplary embodiment of the present application, the current compensation transistor and the electrophoretic driving transistor are weak P-type transistors, and the driving transistor is a strong N-type transistor.

In an exemplary embodiment of the present application, the current compensation module includes a second switching transistor, a first terminal of the second switching transistor is connected to a second terminal of the current compensation transistor, a second terminal of the second switching transistor is connected to an anode of the organic light emitting element, and a control terminal of the second switching transistor is connected to a second scan signal terminal;

The electrophoresis switch unit comprises a third switch transistor, a first end of the third switch transistor is connected with a second end of the electrophoresis drive transistor, a second end of the third switch transistor is connected with the first pole, and a control end of the third switch transistor is connected with a third scanning signal end.

In an exemplary embodiment of the present application, the first, second, and third switching transistors are of the same type, and control terminals of the first, second, and third switching transistors are connected to the same scanning signal terminal.

The second aspect of the present application provides a display panel, which comprises a substrate and a plurality of pixel structures as described above, wherein a plurality of pixel structures are arranged on the substrate in an array manner.

In another exemplary embodiment of the present application, the display panel includes:

the pixel driving layer is formed on the substrate base plate and comprises a plurality of pixel driving modules, a plurality of current compensation modules and a plurality of electrophoresis switch units, wherein the pixel driving modules, the current compensation modules and the electrophoresis switch units are in one-to-one correspondence;

The anode layer is formed on the substrate base plate and comprises a plurality of anodes which are arranged at intervals, and each anode is correspondingly connected with one pixel driving module and one current compensation module;

the pixel definition layer is formed on one side of the pixel driving layer away from the substrate, the pixel definition layer comprises a plurality of pixel openings which are arranged at intervals, the pixel openings are provided with a first opening and a second opening which are arranged in a step mode, the second opening is positioned on one side of the first opening away from the substrate, the first opening and the second opening are coaxially arranged, the caliber of the second opening is larger than that of the first opening, and a step surface is formed between the first opening and the second opening;

the organic light-emitting layer is formed on one side, far away from the substrate, of the anode layer, and comprises a plurality of organic light-emitting parts which are arranged at intervals, and each organic light-emitting part is positioned in a first opening of one pixel opening and is correspondingly connected with one anode;

the cathode layer is formed on one side of the organic light-emitting layer far away from the substrate base plate, the cathode layer comprises a plurality of cathodes which are arranged at intervals, a first part of each cathode is positioned in a first opening of one pixel opening and is connected with the corresponding organic light-emitting part to form the organic light-emitting element, and a second part of each cathode is lapped at a step surface of each pixel opening;

The isolating layer is formed on one side, far away from the substrate, of the cathode layer, and comprises a plurality of isolating parts which are arranged at intervals, wherein each isolating part covers a first part of the cathode and exposes a second part of the cathode;

the electrophoresis driving capacitance layer comprises a plurality of electrophoresis driving capacitances, each electrophoresis driving capacitance electrophoresis particle portion is correspondingly positioned at a second opening of the pixel opening, a first pole and a second pole of the electrophoresis driving capacitance are respectively arranged on two sides of the electrophoresis particle portion, the second pole is connected with a second portion of the cathode which is lapped on the step surface, and the first pole is connected with the electrophoresis switch unit.

In another exemplary embodiment of the present application, the pixel driving module includes a driving transistor, the current compensation module includes a current compensation transistor, the electrophoretic switching unit includes an electrophoretic driving transistor, the current compensation transistor, and the electrophoretic driving transistor are disposed at a distance from each other, and a drain electrode of the driving transistor and a drain electrode of the current compensation transistor are connected to the anode electrode;

The first electrode is connected with the drain electrode of the electrophoresis driving transistor through a transfer electrode.

In another exemplary embodiment of the present application, the switching electrode is provided in the same layer as the anode and spaced apart from the anode.

The scheme of the application has the following beneficial effects:

the pixel structure receives different data voltages through the first pole of the electrophoresis driving capacitor, and controls the positions of the electrophoresis particles in the first pole and the second pole, so that the electrophoresis particles can be controlled to block or not block the light emission of the organic light-emitting element; when the electrophoretic particles are dispersed in the opening area of the pixel structure, the electrophoretic particles partially shield the light emergent side of the organic light-emitting element, but the display is not affected, so that the light emitted by the organic light-emitting element is partially shielded by the electrophoretic particles, and the display panel is in low-brightness display, and the display panel is not required to be in low-brightness display in an alternating mode of bright screen and dark screen, so that discomfort to human eyes is avoided; when the electrophoretic particles are positioned in the non-opening area of the pixel structure, the electrophoretic particles do not shade the light emitting side of the organic light emitting element, so that the display panel is in a high-brightness display state. In this way, switching between high-brightness display and low-brightness display is easier, and control is simpler, and discomfort to the human eye is not caused.

Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a block diagram showing a pixel structure according to a first or second embodiment of the present application;

fig. 2 shows a schematic structural diagram of an electrophoretic driving capacitor according to a first or second embodiment of the present application;

fig. 3 is a schematic circuit diagram of a pixel structure according to a first or second embodiment of the present application;

fig. 4 is a schematic diagram showing states of transistors under a high brightness data signal according to the first or second embodiment of the present application;

Fig. 5 shows a schematic state diagram of each transistor under a low-brightness data signal according to the first or second embodiment of the present application;

fig. 6 shows a circuit diagram of a pixel structure provided with a second switching transistor and a third switching transistor according to the first or second embodiment of the present application;

FIG. 7 is a schematic diagram showing the state of each transistor of the pixel structure of FIG. 6 under high brightness data signals;

FIG. 8 is a schematic diagram showing the state of each transistor of the pixel structure of FIG. 6 under low brightness data signals;

fig. 9 is a schematic structural diagram of a pixel structure and a substrate according to a second embodiment of the present application;

fig. 10 shows a schematic structural diagram of a pixel driving layer according to a second embodiment of the present application;

fig. 11 is a schematic structural diagram of a pixel driving layer provided with an anode and a switching electrode according to a second embodiment of the present application;

fig. 12 is a schematic structural diagram showing a pixel definition layer disposed on a pixel driving layer according to a second embodiment of the present application;

fig. 13 is a schematic diagram showing a structure in which an organic light emitting portion is disposed in a pixel opening according to a second embodiment of the present application;

fig. 14 is a schematic structural view showing that a second portion of the cathode provided in the second embodiment of the application is overlapped with the step surface;

Fig. 15 is a schematic structural view showing a cathode according to a second embodiment of the present application, wherein a separator is disposed on a first portion of the cathode;

fig. 16 is a schematic structural diagram showing a pixel defining layer provided with a first pole and a second pole according to a second embodiment of the present application;

fig. 17 is a schematic diagram showing a structure in which electrophoretic particles are collected at a step surface under the effect of a high-brightness data signal according to a second embodiment of the present application;

fig. 18 is a schematic diagram showing a structure in which the electrophoretic particles according to the second embodiment of the present application are dispersed on the light emitting side of the organic light emitting portion under the effect of the low-luminance data signal;

fig. 19 is a schematic structural diagram of a planar layer with a package layer thereon according to a second embodiment of the present application.

Reference numerals illustrate:

1. a pixel structure; 10. an organic light emitting element; 20. a data end; 30. a positive terminal of the power supply; 40. a power supply negative terminal; 50. a current compensation terminal; 60. an electrophoresis driving end; 70. a pixel driving module; t1, a driving transistor; cst, storage capacitor; t2, a first switching transistor; 80. a current compensation module; t3, a current compensation transistor; t5, a second switching transistor; 90. an electrophoresis driving module; 901. an electrophoresis driving capacitor; 9011. a first pole; 9012. a second pole; 9013. electrophoresis particles; 902. an electrophoresis switch unit; t4, an electrophoresis driving transistor; t6, a third switching transistor; vdata, data signal; vdata1, high brightness data signal; vdata2, low brightness data signal; VDD, a first power supply signal; vp, current compensation signal; vss, a second power supply signal; ve, electrophoretic driving signal; vgate1, a first scanning signal terminal; vgate2, the second scanning signal terminal; vgate3, the third scan signal terminal; 2. a substrate base; 3. a pixel driving layer; 4. an anode; 5. a pixel definition layer; 5a, a first pixel definition layer; 5b, a second pixel definition layer; 51. a pixel opening; 511. a first opening; 512. a second opening; 52. a first temporary storage section; 53. a second temporary storage section; 54. a step surface; 6. an organic light emitting section; 7. a cathode; 71. a first section; 72. a second section; 8. an isolation layer; 9. an electrophoretic particle section; 11. a gate; 12. a source electrode; 13. a drain electrode; 14. a semiconductor layer; 15. a buffer layer; 16. a gate insulating layer; 17. an insulating layer; 18. a first via; 19. a flat layer; 21. a second via; 22. and an encapsulation layer.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.

In the present disclosure, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly, and may be fixedly attached, detachably attached, or integrally formed, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.

Example 1

Referring to fig. 1, a first embodiment of the present application provides a pixel structure 1, which includes an organic light emitting element 10, a data terminal 20, a power positive terminal 30, a power negative terminal 40, a current compensation terminal 50, an electrophoretic driving terminal 60, a pixel driving module 70, a current compensation module 80, and an electrophoretic driving module 90.

Referring to fig. 1 and 2, the cathode of the organic light emitting element 10 is connected to a power negative terminal 40; the pixel driving module 70 is connected with the data terminal 20, the power positive terminal 30 and the anode of the organic light emitting element 10; the current compensation module 80 is connected to the data terminal 20, the current compensation terminal 50, and the anode. The electrophoretic driving module 90 includes an electrophoretic driving capacitor 901 and an electrophoretic switching unit 902, the electrophoretic driving capacitor 901 includes a first pole 9011 and a second pole 9012 and an electrophoretic particle 9013 therebetween, the electrophoretic particle 9013 is located on the light emitting side of the organic light emitting element 10, the first pole 9011 is connected to the data terminal 20 for receiving the data signal Vdata transmitted by the data terminal 20, the second pole 9012 is connected to the negative power terminal 40 for receiving the voltage value of the negative power terminal 40, and the electrophoretic switching unit 902 is connected to the data terminal 20, the electrophoretic driving terminal 60 and the first pole 9011 of the electrophoretic driving capacitor 901.

Note that the organic light emitting element 10 may be a top emission or a bottom emission; when the organic light emitting element 10 is top-emitting, the light emitting side is located at one side of the cathode of the organic light emitting element 10; when the organic light emitting element 10 is bottom-emitting, the light emitting side is located at one side of the anode of the organic light emitting element 10. In this embodiment, the organic light emitting element 10 is a top emission.

When the data terminal 20 receives the high brightness data signal Vdata1, the pixel driving module 70 controls the connection between the power positive terminal 30 and the anode to transmit the first power signal VDD received by the power positive terminal 30 to the anode of the organic light emitting device 10, and the organic light emitting device 10 receives the first power signal VDD to emit bright light; the current compensation module 80 controls the current compensation terminal 50 to be disconnected from the anode, so that the current compensation signal Vp received by the current compensation terminal 50 cannot be transmitted to the anode, i.e. the signal entering the anode of the organic light emitting device 10 is only the first power signal VDD; in addition, the electrophoretic switch unit 902 controls the connection between the electrophoretic driving terminal 60 and the first electrode 9011, and since the first electrode 9011 is further connected to the data terminal 20 to receive the high brightness data signal Vdata1 transmitted from the data terminal 20, and the second electrode 9012 is connected to the power negative terminal 40 to receive the second power signal Vss of the power negative terminal 40, the first electrode 9011 and the second electrode 9012 form a first electric field E1 under the action of the high brightness data signal Vdata1 and the second power signal Vss, and the electrophoretic particles 9013 between the first electrode 9011 and the second electrode 9012 are collected in the non-opening region of the pixel structure 1 under the action of the first electric field E1.

When the data terminal 20 receives the low brightness data voltage Vdata2, the pixel driving module 70 controls the power positive terminal 30 to conduct with the anode, the anode receives the first power signal VDD received by the power positive terminal 30, and the current compensating module 80 controls the current compensating terminal 50 to conduct with the anode so as to transmit the current compensating signal Vp received by the current compensating terminal 50 to the anode, i.e. the signals received by the anode include the first power signal VDD and the current compensating signal Vp received by the power positive terminal 30; the electrophoretic switch unit 902 controls the connection between the electrophoretic driving terminal 60 and the first electrode 9011, wherein the first electrode 9011 is further connected to the data terminal 20, so that the first electrode 9011 receives the electrophoretic driving signal Ve received by the electrophoretic driving terminal 60 and the low-brightness data signal Vdata2 received by the data terminal 20, and the second electrode 9012 receives the second power signal Vss of the power negative terminal 40, so that a second electric field E2 is formed between the first electrode 9011 and the second electrode 9012, and the electrophoretic particles 9013 are dispersed at the opening region of the pixel structure 1 under the action of the second electric field E2.

In the embodiment of the present application, the electrophoretic particles 9013 in the electrophoretic driving capacitor 901 are positive black particles, that is, the electrophoretic particles 9013 have positive charges.

For example, the voltage Vdata received by the data terminal 20 is generally 0-15V, wherein 8-15V is the high brightness data voltage Vdata1, and 0-8V is the low brightness data voltage Vdata2.

Referring to fig. 3 and 4, when the data terminal 20 receives the 12V high brightness data signal Vdata1, the pixel driving module 70 turns on the power positive terminal 30 and the anode according to the high brightness data signal Vdata1 to transmit the first power signal VDD (6V) of the power positive terminal 30 to the anode of the organic light emitting device 10 to drive the organic light emitting device 10 to emit bright light. When the current compensation module 80 receives the 12V high brightness data voltage Vdata1, the current compensation module 80 controls the current compensation terminal 50 to be disconnected from the anode according to the high brightness data voltage Vdata1, so that the current compensation signal Vp received by the current compensation terminal 50 cannot be transmitted to the anode, that is, the anode of the organic light emitting element 10 only receives the first power signal VDD, at this time, the voltage of the anode is equal to the first power signal VDD, and the wavelength of the organic light emitting element 10 material emitted by the current corresponding to the first power signal VDD is unchanged, so that the brightness can be controlled by directly adjusting the data signal Vdata transmitted by the data terminal 20. When the electrophoretic switch unit 902 receives the 12V high brightness data voltage, the electrophoretic driving terminal 60 is controlled to be disconnected from the first pole 9011, and the first pole 9011 receives the 12V high brightness data voltage because the first pole 9011 is connected to the data terminal 20, so that the voltage of the first pole 9011 is 12V, that is, vn=vdata1=12v; further, the second pole 9012 receives the second power supply signal Vss (-6V) at the power supply negative terminal 40, i.e., vm=vss= -6V. Since the voltage of the first pole 9011 is vn=12v and the voltage of the second pole 9012 is vm= -6v, a first electric field E1 is generated between the first pole 9011 and the second pole 9012, and the electrophoretic particles 9013 are positive particles, according to the principle of opposite phase attraction, the electrophoretic particles 9013 move to the second pole 9012 under the action of the first electric field E1, and are accumulated at the non-opening area of the pixel structure 1.

Referring to fig. 3 and 5, when the data terminal 20 receives the 3V low-brightness data voltage Vdata2, the pixel driving module 70 turns on the power positive terminal 30 and the anode according to the low-brightness data voltage signal Vdata2, and the anode receives the first power signal VDD (6V) transmitted from the power positive terminal 30; in addition, when the current compensation module 80 receives the 3V low brightness data voltage signal Vdata2, it controls the conduction between the current compensation terminal 50 and the anode to transmit the current compensation signal Vp (5V) received by the current compensation terminal 50 to the anode, that is, the signal received by the anode includes the first power signal VDD (6V) and the current compensation signal Vp (5V) received by the power positive terminal 30, at this time, the voltage of the anode of the organic light emitting device 10 is equal to the first power signal VDD plus the current compensation signal Vp, so as to ensure that the current entering the anode is larger, and avoid the light emitting wavelength variation caused by the excessively small current flowing through the organic light emitting device 10. The electrophoretic switch unit 902 controls the connection between the electrophoretic driving terminal 60 and the first pole 9011 to charge the first pole 9011, and since the first pole 9011 of the electrophoretic driving capacitor 901 is further connected to the data terminal 20, the maximum voltage received by the first pole 9011 may be the electrophoretic driving signal Ve (-30V) received by the electrophoretic driving terminal 60 and the 3V low-brightness data signal Vdata2 received by the data terminal 20, that is, the voltage of the first pole 9011 is equal to the electrophoretic driving signal Ve plus the low-brightness data signal Vdata2: vn=ve+vdata2, where Vn is the voltage value of the first pole 9011, ve is the electrophoretic driving signal Ve, and vdata2 is the low luminance data signal Vdata2. Bringing the above-mentioned electrophoretic driving signal Ve and the low-luminance data signal Vdata2 into the formula, it can be derived that vn= -30V-3 v= -33V. And receives the second power supply signal Vss (-6V) of the power supply negative terminal 40 due to the second pole 9012, i.e., vm=vss= -6V. The second electric field E2 is formed between the first pole 9011 and the second pole 9012, and since the voltage values between the first pole 9011 and the second pole 9012 are negative, the second electric field E2 is opposite to the electric field direction of the first electric field E1, and the electrophoretic particles 9013 can move towards the first pole 9011 under the influence of the negative voltage values of the first pole 9011 and the second pole 9012 under the influence of the negative voltage values of the second electric field E2, and since the first pole 9011 and the second pole 9012 are both negative voltage values, the electrophoretic particles 9013 are dispersed at the opening region of the pixel structure 1.

The non-opening region and the light emitting side of the organic light emitting element 10 do not have a shielding portion, and the organic light emitting element 10 can emit light completely when the electrophoretic particles 9013 are located in the non-opening region. The opening region refers to a light emitting side of the organic light emitting device 10, and when the electrophoretic particles 9013 are dispersed in the opening region, the electrophoretic particles 9013 can partially block light emitted from the organic light emitting device 10, but do not affect light emission of the organic light emitting device 10, that is, do not affect a display effect, and since the electrophoretic particles 9013 can partially block light emitted from the organic light emitting device 10, light emitted from the light emitting side is reduced, and thus low-brightness display can be realized. According to the application, the light-emitting state of the organic light-emitting element 10 is controlled by controlling the voltage value applied by the data terminal 20, so that the low-brightness display is avoided by adopting a PWM (pulse width modulation) mode, and further, the human eyes can be better protected, and better use experience is obtained.

In addition, the data signal Vdata of the data terminal 20 can be regulated to switch between low brightness and high brightness, so that the switching mode of brightness is simpler and the operation is more convenient.

It should be noted that, the first power signal VDD is not only 6V, but also 4V, 5V, 7V, 8V, etc.; the second power supply signal Vss is not only-6V, but also-4V, -5V, -7V, -8V, etc.; the current compensation signal Vp is not only 5V but also 4V, 6V, 7V, 8V, etc.; the electrophoresis driving signal Ve is not only-30V, but also-29V, -28V, -31V, -32V, etc.; the above voltage values can be switched according to different embodiments.

Furthermore, in other embodiments, when the electrophoretic particles 9013 are negative particles, i.e., the electrophoretic particles 9013 are negatively charged, the electrophoretic driving signal Ve may be 28V, 29V, 30V, 31V, 32V, i.e., the electrophoretic driving signal Ve is a positive voltage. So as to drive the electrophoretic particles 9013 to move between the first pole 9011 and the second pole 9012.

It is understood that, in order to enhance shielding of the light emitted from the organic light emitting element 10, the electrophoretic particles 9013 may be black electrophoretic particles 9013. In order to avoid that the electrophoretic particles 9013 completely block the light emitting side of the organic light emitting element 10, the area of the electrophoretic particles 9013 laid flat should be smaller than the light emitting side of the organic light emitting element 10 when the electrophoretic particles are positioned on the same horizontal plane.

As shown in fig. 3, the pixel driving module 70 includes a driving transistor T1, a storage capacitor Cst, and a first switching transistor T2.

A first end of the driving transistor T1 is connected with the positive electrode terminal 30 of the power supply, and a second end of the driving transistor T1 is connected with the anode; the first end of the storage capacitor Cst is connected with the positive electrode end 30 of the power supply, and the second end of the storage capacitor Cst is connected with the control end of the driving transistor T1; the first end of the first switching transistor T2 is connected to the data end 20 to receive the data signal Vdata of the data end 20, the second end of the first switching transistor T2 is connected to the control end of the driving transistor T1 and the second end of the storage capacitor Cst, the control end of the first switching transistor T2 is connected to the first scan signal end Vgate1, and the first scan signal end Vgate1 transmitted by the first scan signal end Vgate1 controls the first switching transistor T2 to be turned on or off.

It should be noted that, the data signal Vdata is transmitted to the control terminal of the driving transistor T1 through the first switching transistor T2 to control the driving transistor T1 to be turned on or turned off; when the driving transistor T1 is turned on, the power supply positive electrode terminal 30 charges the storage capacitor Cst and supplies current to the organic light emitting element 10 to drive the organic light emitting element 10 to emit light.

Still further, referring to fig. 3, the current compensation module 80 includes a current compensation transistor T3, a first terminal of the current compensation transistor T3 is connected to the current compensation terminal 50, a second terminal of the current compensation transistor T3 is connected to the anode of the organic light emitting element 10, and a control terminal of the current compensation transistor T3 is connected to the data terminal 20. The data signal Vdata supplied from the data terminal 20 controls the current compensation transistor T3 to be turned on or turned off; when the data signal Vdata is in the low-luminance data signal Vdata2, the current compensation transistor T3 is in a conductive state, and the current compensation signal Vp obtained by the current compensation terminal 50 is supplied to the anode of the organic light emitting element 10, so as to compensate the current flowing through the organic light emitting element 10, thereby ensuring that the current is larger and avoiding the light emitting wavelength variation caused by too small current flowing through the organic light emitting element 10.

Referring to fig. 3, the electrophoretic switching unit 902 includes an electrophoretic driving transistor T4, a first terminal of the electrophoretic driving transistor T4 is connected to the electrophoretic driving terminal 60, a second terminal of the electrophoretic driving transistor T4 is connected to the first electrode 9011, and a control terminal of the electrophoretic driving transistor T4 is connected to the data terminal 20. The data signal Vdata delivered by the data terminal 20 controls the electrophoresis driving transistor T4 to be in an on state or an off state, when the data signal Vdata is in the low-brightness data signal Vdata2, the electrophoresis driving transistor T4 is in an on state, the electrophoresis driving signal Ve obtained by the electrophoresis driving terminal 60 is delivered to the first pole 9011 of the driving capacitor, the electrophoresis driving capacitor 901 is charged differently according to the opening degree of the electrophoresis driving transistor T4, when the electrophoresis driving transistor T4 is opened maximally, the maximum voltage value delivered to the first pole 9011 is equal to the electrophoresis driving signal Ve plus the low-brightness data signal Vdata2, and then the electrophoresis driving signal Ve and the second pole 9012 form a second electric field E2, and the electrophoresis particles 9013 move in the electric field direction under the action of the second electric field E2 to block the light emitting side of the organic light emitting element 10, so that the brightness is reduced, thereby realizing low brightness.

Further, the current compensation transistor T3 and the electrophoresis driving transistor T4 are doped with BH3, the doping amount is 10≡5-10≡10cm-3, the current compensation transistor T3 and the electrophoresis driving transistor T4 are weak P-type transistors, when the voltages received by the control terminals of the current compensation transistor T3 and the electrophoresis driving transistor T4 are in a low positive voltage or negative voltage state, the current compensation transistor T3 and the electrophoresis driving transistor T4 are turned on, and the lower the voltages, the larger the turn-on degree of the current compensation transistor T3 and the electrophoresis driving transistor T4 is, the voltages received by the control terminals of the current compensation transistor T3 and the electrophoresis driving transistor T4 are to be turned off to a certain extent, for example, the voltages received by the control terminals of the current compensation transistor T3 and the electrophoresis driving transistor T4 are all in high voltages, for example, 9V, 10V, 11V, 12V, 13V, 14V and 15V, and when the voltages received by the control terminals of the current compensation transistor T3 and the electrophoresis driving transistor T4 are in the high voltage state, the current compensation transistor T3 and the electrophoresis driving transistor T4 are not turned on, i.e. the current compensation transistor T4 is not turned on.

In addition, the driving transistor T1 is doped by PH5, the doping amount is between 10-19 cm < -3 >, so that the driving transistor T1 is a strong N-type transistor and can be turned on only when the voltage received by the control end of the driving transistor T1 is positive voltage, and the higher the voltage received by the control end is, the higher the turning-on degree is, the lower the voltage received by the control end is, and the lower the turning-on degree is.

As can be understood, referring to fig. 4, when the data signal Vdata is the high brightness data signal Vdata1, the current compensation transistor T3 and the electrophoretic driving transistor T4 are turned off, the driving transistor T1 is turned on to make the current flowing through the organic light emitting element 10 larger, the light emitting material of the organic light emitting element 10 emits light with a constant wavelength under a large current, and the brightness can be controlled by adjusting the size of the data signal Vdata. At this time, the voltages of the first pole 9011 and the second pole 9012 of the electrophoretic driving capacitor 901 are vn=vdata1, vm=vss, and the voltage difference is vdata1-Vss > 0, and the electrophoretic particles 9013 move to the second pole 9012 under the action of the first electric field E1, so that the electrophoretic particles 9013 are collected in the non-opening area, and the light emitting of the organic light emitting element 10 is not affected, thereby realizing the high brightness display.

Referring to fig. 5, when the data signal Vdata is the low luminance data signal Vdata2, the voltage value of the low luminance data signal Vdata2 is smaller, and the smaller the turn-on degree of the driving transistor T1 is, the smaller the current flowing into the organic light emitting element 10 through the driving transistor T1 is. And because the low brightness data signal Vdata2 controls the current compensation transistor T3 to be turned on, that is, the anode of the organic light emitting element 10 will also input the current compensation signal Vp delivered by the current compensation terminal 50 to compensate the current flowing into the organic light emitting element 10, the current flowing through the organic light emitting element 10 is ensured to be larger due to the existence of the compensation current, and the change of the emission wavelength of the organic light emitting element 10 caused by the small current flowing is avoided. In addition, the low-brightness data signal Vdata2 controls the electrophoresis driving transistor T4 to be turned on, charges the electrophoresis driving capacitor 901, controls the voltage value of the first electrode 9011, changes the electric field direction between the first electrode 9011 and the second electrode 9012, further moves the electrophoresis particles 9013 in the electric field, and partially shields the light emitting side of the organic light emitting element 10, so that the brightness is reduced, thereby realizing low brightness.

In this embodiment, referring to fig. 6, 7 and 8, the current compensation module 80 further includes a second switching transistor T5, a first terminal of the second switching transistor T5 is connected to a second terminal of the current compensation transistor T3, a second terminal of the second switching transistor T5 is connected to the anode of the organic light emitting element 10, and a control terminal of the second switching transistor T5 is connected to the second scan signal terminal Vgate 2; the electrophoretic switching unit 902 includes a third switching transistor T6, a first terminal of the third switching transistor T6 is connected to a second terminal of the electrophoretic driving transistor T4, a second terminal of the third switching transistor T6 is connected to the first pole 9011, and a control terminal of the third switching transistor T6 is connected to the third scan signal terminal Vgate 3. By means of the second switching transistor T5 and the third switching transistor T6, power down can be reduced or leakage can be avoided.

It should be noted that, the first switching transistor T2, the second switching transistor T5 and the third switching transistor T6 are all of the same type, N-type or P-type transistors, and the control terminals of the first switching transistor T2, the second switching transistor T5 and the third switching transistor T6 are connected with the same scanning signal terminal, that is, the first scanning signal terminal Vgate1, the second scanning signal terminal Vgate2 and the third scanning signal terminal Vgate3 are the same scanning signal terminal, the transmitted scanning signals are the same, that is, the first switching transistor T2 is turned on, the second switching transistor T5 and the third switching transistor T6 are all turned on, the first switching transistor T2 is turned off, and the second switching transistor T5 and the third switching transistor T6 are all turned off.

The scan signal may be about.+ -. 6V, for example, -6V, -5V, -4V, -3V, -2V, -1V, 0V, 1V, 2V, 3V, 4V, 5V, 6V.

It is noted that, when the high brightness data signal Vdata1 and the low brightness data signal Vdata2 are both in the on state, the first switching transistor T2, the second switching transistor T5 and the third switching transistor T6 are all in the on state.

Example two

Referring to fig. 9, a second embodiment provides a display panel, which includes a substrate 2 and a plurality of pixel structures 1 as described in the first embodiment, wherein the plurality of pixel structures 1 are arranged on the substrate 2 in an array manner.

The substrate 2 may be glass, quartz or other suitable material.

Further, the display panel further includes a pixel driving layer 3, an anode layer, a pixel defining layer 5, an organic light emitting layer, a cathode layer, an isolation layer 8, an electrophoretic particle layer, and a capacitance driving layer, which are sequentially disposed in the thickness direction of the substrate 2.

As shown in fig. 1 and 10, the pixel driving layer 3 is formed on the substrate 2, and the pixel driving layer 3 includes a plurality of pixel driving modules 70, a plurality of current compensation modules 80, and a plurality of electrophoretic switching units 902, where the pixel driving modules 70, the current compensation modules 80, and the electrophoretic switching units 902 are in one-to-one correspondence.

It is understood that the one-to-one correspondence among the pixel driving module 70, the current compensation module 80 and the electrophoretic switching unit 902 refers to: a pixel unit includes a pixel driving module 70, a current compensation module 80 and an electrophoretic switching unit 902 to control a pixel light emitting state of the pixel unit.

Still further, referring to fig. 11, ITO/Ag/ITO is coated on the pixel driving layer 3, and an anode layer is formed by photolithography and etching, the anode layer including a plurality of anodes 4 arranged at intervals, the anodes 4 corresponding to the pixel structure 1, and each anode 4 being correspondingly connected to one pixel driving module 70 and one current compensation module 80 to transmit signals to the anodes 4.

Referring to fig. 12, a pixel defining layer 5 is formed on a side of the pixel driving layer 3 away from the substrate 2, the pixel defining layer 5 includes a plurality of pixel openings 51 disposed at intervals, the pixel openings 51 have a first opening 511 and a second opening 512 disposed in a step shape, the second opening 512 is disposed on a side of the first opening 511 away from the substrate 2, the first opening 511 and the second opening 512 are coaxially disposed, and a caliber of the second opening 512 is larger than a caliber of the first opening 511, and a step surface 54 is formed between the first opening 511 and the second opening 512. The pixel defining layer 5 may be made of an organic material PI.

As an example, referring to fig. 12, each pixel unit includes a first pixel defining layer 5a and a second pixel defining layer 5b disposed at a distance from each other, and the pixel opening 51 is formed between the first pixel defining layer 5a and the second pixel defining layer 5 b; the first pixel defining layer 5a and the second pixel defining layer 5b each include a first temporary storage portion 52 and a second temporary storage portion 53, the first temporary storage portion 52 is disposed on a side of the second temporary storage portion 53 close to the substrate 2, a first opening 511 is formed between the first temporary storage portion 52 of the first pixel defining layer 5a and the first temporary storage portion 52 of the second pixel defining layer 5b, and a second opening 512 is formed between the second temporary storage portion 53 of the first pixel defining layer 5a and the second temporary storage portion 53 of the second pixel defining layer 5 b. Wherein, the caliber of the first opening 511 is smaller than that of the second opening 512, and a step surface 54 is formed between the first opening 511 and the second opening 512. That is, the step surface 54 is formed at the junction of the first temporary storage portion 52 and the second temporary storage portion 53.

It should be understood that the connection between the first temporary storage portion 52 and the second temporary storage portion 53 on both sides forms a stepped surface 54. That is, two mutually symmetrical step surfaces 54 are included in one pixel unit.

The first pixel defining layer 5a and the second pixel defining layer 5b each cover a part of the anode 4, and the other part of the anode 4 leaks out from the pixel opening 51.

Further, as shown in fig. 13, an organic light emitting layer is formed on a side of the anode layer away from the substrate 2 by vapor deposition, the organic light emitting layer includes a plurality of organic light emitting portions 6 arranged at intervals, the organic light emitting portions 6 are located in the first openings 511 of the pixel openings 51 and cover the anode 4 located in the first openings 511 of the pixel openings 51, and the organic light emitting portions 6 are connected to the anode 4. In this embodiment, the area of the first opening 511 may correspond to an opening area of the pixel structure 1, and the area surrounding the first opening 511 is a non-opening area of the pixel structure 1. Wherein, the front projection of the organic light emitting part 6 on the substrate 2 and the front projection of the step surface 54 on the substrate 2 do not overlap, and the step surface 54 is located in the non-opening area of the pixel structure 1.

Further, referring to fig. 14, a metal layer is coated on the organic light emitting layer, and a cathode layer is formed by photolithography and etching, the cathode layer including a plurality of cathodes 7 disposed at intervals, the cathodes 7 including a first portion 71 and a second portion 72 connected to each other. Wherein the first portion 71 of the cathode 7 is located in the first opening 511 of the pixel opening 51, covers the organic light emitting portion 6 and is connected thereto to form the organic light emitting device 10; the second portion 72 of the cathode 7 is overlapped on the step surface 54 at one side, i.e. the junction with the first temporary storage portion 52 and the second temporary storage portion 53 of the first pixel defining layer 5a or the junction with the first temporary storage portion 52 and the second temporary storage portion 53 of the second pixel defining layer 5 b. Wherein, the metal layer can adopt Mg/Ag alloy.

In the present embodiment, a hole transporting layer and a hole blocking layer are further included between the anode 4 and the organic light emitting portion 6 to transport holes in the anode 4 into the organic light emitting portion 6; an electron blocking layer and an electron transport layer are further included between the cathode 7 and the organic light emitting part 6; that is, the organic light emitting element 10 includes an anode 4, a hole transport layer, a hole blocking layer, an organic light emitting portion 6, an electron blocking layer, an electron transport layer, and a cathode 7.

Further, referring to fig. 15, an organic barrier layer 8 is coated by Ink Jet Printing (IJP), and PI or PMMA may be used for the organic barrier layer 8. The isolating layer 8 covers the first portion 71 of the cathode and leaks out of the second portion 72 of the cathode for isolating the electrophoretic particle layer from the organic light emitting portion 6, ensuring normal light emission of the organic light emitting portion 6.

Still further, referring to fig. 16, an electrophoretic driving capacitor layer is formed by vapor deposition, the electrophoretic driving capacitor layer includes a plurality of electrophoretic driving capacitors 901, the electrophoretic particle portion 9 of each electrophoretic driving capacitor 901 is located in the second opening 512 of one pixel opening 51, the electrophoretic particle portion 9 thereof completely covers the isolation layer 8, and a portion of the electrophoretic particle portion 9 covers the second portion 72 of the cathode. The electrophoretic driving capacitor 901 further comprises a plurality of first poles 9011 and second poles 9012 disposed at intervals, wherein the first poles 9011 and the second poles 9012 are respectively disposed on the second pixel defining layer 5b and the first pixel defining layer 5a, a portion of the first poles 9011 is disposed in the second opening 512 of the pixel opening 51, another portion of the first poles 9011 is overlapped on the second pixel defining layer 5b and connected to the electrophoretic switching unit 902, a portion of the second poles 9012 is disposed in the second opening 512 of the pixel opening 51 and connected to the second portion 72 of the cathode 7 overlapped on the step surface 54 for receiving the voltage signal Vss of the power negative terminal 40, and another portion of the second poles 9012 is overlapped on the first pixel defining layer 5 a.

As shown in fig. 17 or 18, the electrophoretic particle unit 9 is coated by Ink Jet Printing (IJP), and the first pole 9011 and the second pole 9012 are provided on both sides of the electrophoretic particle unit 9. The electrophoretic particle unit 9 includes black electrophoretic particles 9013 and an electrophoretic liquid, the first pole 9011 and the second pole 9012 respectively receive different voltage values to drive the electrophoretic particles 9013 to move in the electrophoretic liquid, and two ends of the electrophoretic particle unit 9 and the front projection of the step surface 54 on the substrate 2 have partial overlapping to provide a containing space for the electrophoretic particles 9013. At the time of highlighting, the electrophoretic particles 9013 may aggregate and move to the step surface 54 to avoid affecting the light emission of the organic light emitting portion 6, as shown in fig. 18; in the low-luminance display, the electrophoretic particles 9013 may move in the electrophoretic liquid to block the light emission of the organic light emitting portion 6, so that the low-luminance display is realized, as shown in fig. 19.

It should be noted that the electrophoretic particles 9013 may be positive electrophoretic particles 9013 or negative electrophoretic particles 9013, and may be specifically designed according to different embodiments; in the second embodiment, positive electrophoretic particles 9013 are used as the electrophoretic particles 9013.

It can be understood that one pixel driving module 70, one current compensation module 80, one electrophoretic switching unit 902, the anode 4, the organic light emitting portion 6, the cathode 7, the isolation portion, the electrophoretic particle portion 9, the first electrode 9011 and the second electrode 9012 constitute one pixel structure 1 to realize a display mode of switching between low brightness and high brightness.

In this embodiment, the display panel is a top emission structure, that is, the light exits from one side of the cathode 7. In other embodiments, the display panel is a bottom emission structure, i.e. light is emitted from one side of the anode 4.

Further, as shown in fig. 12 and 17, in the direction from the substrate 2 to the pixel driving layer 3, the pitch between the first temporary storage portion 52 of the first pixel defining layer 5a and the first temporary storage portion 52 of the second pixel defining layer 5b gradually increases, and the pitch between the second temporary storage portion 53 of the first pixel defining layer 5a and the second temporary storage portion 53 of the second pixel defining layer 5b gradually increases. In this way, the scattering range of the organic light emitting part 6 is increased by gradually increasing the interval, so that the light emitting width of the organic light emitting part 6 can be increased, and the brightness of the display panel can be ensured; in addition, the space of the step surface 54 can be increased by gradually increasing the distance, so that more electrophoretic particles 9013 can be accommodated; the flow velocity of the first pole 9011 and the second pole 9012 during evaporation can be influenced by gradually increasing the distance, the flow velocity is reduced, the adhesive force between the first pole 9011 and the second pole 9012 and the second pixel definition layer 5b and the first pixel definition layer 5a is increased, the first pole 9011 and the second pole 9012 are prevented from falling off from the second pixel definition layer 5b and the first pixel definition layer 5a, and the formation of an electrophoresis driving capacitance layer is further ensured.

It will be appreciated that in other embodiments, in the direction from the substrate 2 to the pixel driving layer 3, the space between the first temporary storage portion 52 of the first pixel defining layer 5a and the first temporary storage portion 52 of the second pixel defining layer 5b gradually increases, and the space between the second temporary storage portion 53 of the first pixel defining layer 5a and the second temporary storage portion 53 of the second pixel defining layer 5b is unchanged. In still other embodiments, in the direction from the substrate 2 to the pixel driving layer 3, the distance between the first temporary storage portion 52 of the first pixel defining layer 5a and the first temporary storage portion 52 of the second pixel defining layer 5b is unchanged, and the distance between the second temporary storage portion 53 of the first pixel defining layer 5a and the second temporary storage portion 53 of the second pixel defining layer 5b is also unchanged. It is sufficient to ensure that a step surface 54 can be formed between the first temporary storage portion 52 and the second temporary storage portion 53.

Still further, the pixel driving module 70 includes a driving transistor T1, the current compensation module 80 includes a current compensation transistor T3, the electrophoretic switch includes an electrophoretic driving transistor T4, and the driving transistor T1, the current compensation transistor T3 and the electrophoretic driving transistor T4 are disposed at intervals. The driving transistor T1, the current compensation transistor T3, and the electrophoretic driving transistor T4 each include a gate electrode 11, a source electrode 12, a drain electrode 13, and a semiconductor layer 14.

In this embodiment, as shown in fig. 17, a Buffer layer (Buffer) 15 made of silicide material such as SiNx and SiOx is further formed on the base substrate 2; a semiconductor layer 14 is formed on a side of the buffer layer 15 remote from the substrate base plate 2, and the semiconductor layer 14 may be made of a Poly-Si material. The semiconductor layer 14 and the gate electrode 11 are insulated from each other, and a gate insulating layer 16 is provided between the semiconductor layer 14 and the gate electrode 11, and the gate insulating layer 16 is made of the same material as the buffer layer 15, for example, a silicide material such as SiNx or SiOx. The gate electrode 11 may be made of a metal material or an alloy material, including molybdenum, aluminum, copper, titanium, etc., for example, to ensure good conductivity. The gate 11, the source 12 and the drain 13 are also insulated, that is, an insulating layer 17 is coated on the gate 11, and the insulating layer 17 covers the gate 11 and can be made of SiNx, siOx and other materials. And punching the insulating layer 17 and the gate insulating layer 16 to form a first via hole 18 to leak out a portion of the semiconductor layer 14, forming a metal layer on the insulating layer 17, and performing photolithography and etching on the metal layer to form the source electrode 12 and the drain electrode 13, wherein the source electrode 12 and the drain electrode 13 are arranged at the same layer and a distance, and are connected with the semiconductor layer 14 through the first via hole 18.

The first via hole 18 penetrates the insulating layer 17 completely and penetrates the gate insulating layer 16 partially to leak out part of the semiconductor layer 14.

In addition, the source electrode 12 and the drain electrode 13 may include a metal material or an alloy material, such as a metal single layer or a multi-layer structure formed of molybdenum, aluminum, copper, titanium, etc., for example, the multi-layer structure is a multi-metal layer stack, such as titanium, aluminum, copper, a titanium three-layer metal stack (Al/Ti/Cu/Al), etc.

It is noted that the source electrode 12 and the drain electrode 13 are provided in the same layer, and in the present application, unless otherwise indicated, the term "same layer provided" is used to mean that two layers, parts, components, elements or portions may be formed by the same patterning process, and that the two layers, parts, components, elements or portions are generally formed of the same material.

In the present application, the expression "patterning process" generally includes the steps of coating of photoresist, exposure, development, etching, stripping of photoresist, and the like, unless otherwise specified. The expression "one patterning process" means a process of forming a patterned layer, feature, component, etc. using a single mask.

Further, as shown in fig. 17, a flat layer 19 made of an organic material PI is coated on a side of the insulating layer 17 away from the substrate 2, the flat layer 19 covers the insulating layer 17, the source electrode 12 and the drain electrode 13, and then the flat layer 19 is perforated to form a second via hole 21, and the second via hole 21 leaks out of a portion of the drain electrode 13. The anode 4 and the switching electrode are formed on the flat layer 19, the anode 4 and the switching electrode are arranged at the same layer and at intervals, the anode 4 is connected with the drain electrode 13 of the driving transistor T1 and the current compensation transistor T3 through the second via hole 21, and the switching electrode is connected with the drain electrode 13 of the electrophoresis driving transistor T4 through the second via hole 21.

The first electrode 9011 is connected to the drain electrode 13 of the electrophoretic driving transistor T4 through a switching electrode to receive the electrophoretic driving signal Ve and the data signal Vdata, and further to drive the electrophoretic particles 9013 in the electrophoretic particle unit 9 to move in the electrophoretic liquid.

As can be understood, referring to fig. 4 and 17, when the high brightness data signal Vdata1 is input, the first electrode 9011 receives the high brightness data signal Vdata1, the second electrode 9012 receives the voltage Vss of the power negative electrode terminal 40, so that an electric field is formed between the first electrode 9011 and the second electrode 9012, and the electric field direction is toward the first electric field E1 of the second electrode 9012, so as to control the electropositive electrophoretic particles 9013 in the electrophoretic particle portion 9 to gradually move toward the second electrode 9012 with a low voltage value, and move to the step surface 54 at the second electrode 9012, the front projection of the electrophoretic particles 9013 at the step surface 54 and the organic light emitting portion 6 on the substrate 2 do not overlap, the organic light emitting portion 6 emits light completely, the light emitting of the organic light emitting portion 6 is not affected, and the light emitting brightness under high brightness is ensured.

Referring to fig. 5 and 18, when the low-luminance data signal Vdata2 is input, the first electrode 9011 receives the low-luminance data signal Vdata2 and the electrophoresis driving signal Ve at the same time, the second electrode 9012 receives the voltage Vss of the power negative electrode 40, so as to reduce the voltage value of the first electrode 9011 to be negative and lower than the voltage value of the second electrode 9012, so that a second electric field E2 with the electric field direction facing the first electrode 9011 is formed between the first electrode 9011 and the second electrode 9012, and the electrophoresis particles 9013 located in the step surface 54 are driven to gradually move towards the first electrode 9011, so that the electrophoresis particles can move to the light emitting side of the organic light emitting portion 6, and the light emitting side of the organic light emitting portion 6 is partially blocked, but the display is not affected, only the light emitting amount is reduced, and the low-luminance display can be realized; in addition, the current compensation transistor T3 inputs a compensation current to the anode 4 through the drain electrode 13 to ensure a large current in the organic light emitting portion 6, and avoids a change in emission wavelength caused by an excessively small current.

In addition, referring to fig. 19, the display panel further includes a film encapsulation layer TFE (Thin film encapsulation) formed by forming SiOyNx by chemical vapor deposition (Chemical Vapor Deposition, CVD), forming an organic layer by Ink Jet Print (IJP), forming SiNx by chemical vapor deposition (Chemical Vapor Deposition, CVD), and combining the three layers. So as to better isolate the moisture in the outside, avoid the moisture from penetrating into the organic light-emitting part 6 and ensure the display effect.

In the description of the present specification, reference to the terms "some embodiments," "exemplary," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made in the above embodiments by those skilled in the art within the scope of the application, which is therefore intended to be covered by the appended claims and their equivalents.

Claims

1. A pixel structure comprising an organic light emitting element, a data terminal, a power supply positive terminal and a power supply negative terminal, a cathode of the organic light emitting element being connected to the power supply negative terminal, the pixel structure further comprising:

a current compensation terminal and an electrophoresis driving terminal;

2. The pixel structure of claim 1, wherein the pixel driving module comprises a driving transistor, a storage capacitor, and a first switching transistor;

3. The pixel structure according to claim 2, wherein the current compensation module comprises a current compensation transistor, a first terminal of the current compensation transistor is connected to the current compensation terminal, a second terminal of the current compensation transistor is connected to an anode of the organic light emitting element, and a control terminal of the current compensation transistor is connected to the data terminal;

4. A pixel structure according to claim 3, wherein the current compensation transistor and the electrophoretic drive transistor are both weak P-type transistors and the drive transistor is a strong N-type transistor.

5. A pixel structure according to claim 3, wherein the current compensation module comprises a second switching transistor, a first terminal of the second switching transistor being connected to a second terminal of the current compensation transistor, a second terminal of the second switching transistor being connected to an anode of the organic light emitting element, a control terminal of the second switching transistor being connected to a second scanning signal terminal;

6. The pixel structure according to claim 5, wherein the first, second and third switching transistors are of the same type, and control terminals of the first, second and third switching transistors are connected to the same scanning signal terminal.

7. A display panel comprising a substrate and a plurality of pixel structures according to claim 1, wherein a plurality of the pixel structures are arranged in an array on the substrate.

8. The display panel of claim 7, wherein the display panel comprises:

9. The display panel according to claim 7, wherein the pixel driving module includes a driving transistor, the current compensation module includes a current compensation transistor, the electrophoretic switching unit includes an electrophoretic driving transistor, the current compensation transistor, and the electrophoretic driving transistor are disposed at a distance from each other, and a drain of the driving transistor and a drain of the current compensation transistor are connected to the anode;

10. The display panel of claim 9, wherein the switching electrode is co-layered with and spaced apart from the anode.