CN111463362B - Display panel, manufacturing method and driving method thereof, and display device - Google Patents

Display panel, manufacturing method and driving method thereof, and display device Download PDF

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Publication number
CN111463362B
CN111463362B CN202010284291.7A CN202010284291A CN111463362B CN 111463362 B CN111463362 B CN 111463362B CN 202010284291 A CN202010284291 A CN 202010284291A CN 111463362 B CN111463362 B CN 111463362B
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sub
saturable absorber
display panel
pixel unit
pixel
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CN111463362A (en
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张伟
杨一帆
曹鹏
李金钰
廖兵
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K50/865—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/1201—Manufacture or treatment
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application discloses a display panel, a manufacturing method thereof, a driving method and a display device, which are used for improving driving current, avoiding abnormal lighting of sub-pixels and improving display effect. An embodiment of the present application provides a display panel, display panel includes: the pixel structure comprises a plurality of sub-pixel units, an encapsulation layer for sealing the sub-pixel units, and a saturable absorber positioned on the encapsulation layer; the sub-pixel unit comprises an electroluminescent device; the saturable absorber at least covers the light emitting areas of the sub-pixel units; the saturable absorber has a preset absorbance luminance threshold, the saturable absorber configured to: and absorbing light which is not more than the preset light absorption brightness threshold value in the sub-pixel unit.

Description

Display panel, manufacturing method and driving method thereof, and display device
Technical Field
The application relates to the technical field of display, in particular to a display panel, a manufacturing method of the display panel, a driving method of the display panel and a display device.
Background
Compared with a liquid crystal display, an Organic Light Emitting Diode (OLED) display has the advantages of being bendable, high in contrast and the like, and more panel manufacturers pay attention to or invest in the field. The OLED includes: the OLED display comprises an anode, a cathode and a light-emitting layer positioned between the anode and the cathode, and the OLED display principle is as follows: holes are injected into the light-emitting layer from the anode, electrons are injected into the light-emitting layer from the cathode, and the electrons and the holes are compounded in the light-emitting layer to emit light, so that the brightness of the OLED screen is controlled by the current of the OLED device passing through the pixel points. The prior art generally utilizes a Thin Film Transistor (TFT) to drive an OLED device to emit light, and the control of the current by the TFT directly affects the light emission intensity of the OLED panel. Because the resolution ratio of the screen is higher and higher, under the condition that the brightness of the screen is not changed, the driving current of the pixel point is smaller and smaller, and particularly under an extremely low gray scale, the driving current is very small. The following is therefore possible: at zero gray scale, the leakage current of the TFT may still light the OLED, which may cause a decrease in the contrast of the screen and reduce the user experience. Also, at a low gray scale, since the driving current is small, luminance is not uniform at the low gray scale.
In summary, in the prior art, the driving current under the low gray scale is not easy to control, which easily causes the abnormal lighting of the pixels and the uneven brightness of the display image.
Disclosure of Invention
The embodiment of the application provides a display panel, a manufacturing method thereof, a driving method thereof and a display device, which are used for improving driving current, avoiding abnormal lighting of sub-pixels and improving display effect.
The embodiment of the application provides a display panel, display panel includes: the pixel structure comprises a plurality of sub-pixel units, an encapsulation layer for sealing the sub-pixel units, and a saturable absorber positioned on the encapsulation layer; the sub-pixel unit comprises an electroluminescent device; the saturable absorber at least covers the light emitting area of the sub-pixel unit; the saturable absorber has a preset absorbance luminance threshold, the saturable absorber configured to: and absorbing light which is not more than the preset light absorption brightness threshold value in the sub-pixel unit.
According to the display panel provided by the embodiment of the application, the saturable absorber is arranged, so that the saturable absorber can absorb light, namely, the luminance of the electroluminescent device in the sub-pixel unit is higher than the luminance of the light emitted by the sub-pixel unit, and the driving current of the electroluminescent device can be improved. The abnormal lighting of the pixels can be avoided, and the contrast of the display panel is improved. And uneven display picture caused by too low driving current of the electroluminescent device under the condition of low gray scale and difficult control can be avoided.
Optionally, the saturable absorbers of different sub-pixel units are integrally connected.
In the display panel provided by the embodiment of the application, the whole saturated absorber layer is arranged, the process is simple, and the realization is easy.
Optionally, the material of the saturable absorber comprises: a chromium and/or cobalt doped semiconductor material.
Optionally, the electroluminescent device includes an anode, a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, an electron injection layer, and a cathode, which are sequentially stacked; the hole transport layers of different sub-pixel units are integrally connected.
According to the display panel provided by the embodiment of the application, due to the arrangement of the saturable absorber, even if the holes flow to other sub-pixel units which do not need to be lightened through the integrally connected hole transport layer to cause weak leakage current, light emitted by the electroluminescent device caused by the leakage current can be absorbed by the saturable absorber, namely, a light emitting user of the electroluminescent device caused by the leakage current is invisible, so that the color purity and the color gamut of a monochromatic picture under low gray scale are improved.
The embodiment of the application provides a preparation method of a display panel, which comprises the following steps:
forming an electroluminescent device corresponding to the light emitting color of the sub-pixel unit on the substrate;
forming an encapsulation layer sealing the electroluminescent device;
forming a saturable absorber at least covering the light emitting areas of the sub-pixel units on the packaging layer; wherein the saturable absorber has a preset absorbance luminance threshold, the saturable absorber configured to: and absorbing light which is not more than the preset light absorption brightness threshold value in the sub-pixel unit.
According to the preparation method of the display panel, the saturable absorber is arranged, so that the saturable absorber can absorb light, namely the luminance of the electroluminescent device in the sub-pixel unit is higher than the luminance of the light emitted by the sub-pixel unit, and the driving current of the electroluminescent device can be improved. The abnormal lighting of the pixels can be avoided, and the contrast of the display panel is improved. And uneven display pictures caused by too low driving current of the electroluminescent device under the condition of low gray scale and difficult control can be avoided.
Optionally, forming a saturable absorber at least covering the light emitting region of the sub-pixel unit on the encapsulation layer specifically includes:
providing a semiconductor material target doped with chromium and/or cobalt;
and depositing the chromium and/or cobalt-doped semiconductor material target by adopting a chemical vapor deposition process to form a layer of saturable absorber.
Optionally, forming an electroluminescent device corresponding to the light emitting color of the sub-pixel unit on the substrate includes:
sequentially forming an anode, a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, an electron injection layer and a cathode on the substrate; wherein the hole transport layers of different sub-pixel units are integrally connected.
The embodiment of the application provides a driving method of a display panel, which comprises the following steps:
determining the gray scale of each sub-pixel unit in an image to be displayed;
determining the driving current of the sub-pixel unit according to the gray scale and the preset light absorption brightness threshold;
providing the drive current to the sub-pixel cell.
According to the display panel driving method provided by the embodiment of the application, the saturable absorber is arranged on the display panel, and the saturable absorber can absorb light, namely the luminance of the electroluminescent device in the sub-pixel unit is higher than the luminance of the light emitted by the sub-pixel unit, so that compared with the prior art, for the display image with the same gray scale, the display panel driving method provided by the embodiment of the application can improve the driving current of the sub-pixel unit, can avoid abnormal lighting of the pixel, and improves the contrast of the display panel. And uneven display picture caused by too low driving current of the electroluminescent device under the condition of low gray scale and difficult control can be avoided.
Optionally, determining the driving current of the sub-pixel unit according to the gray scale and the preset light absorption brightness threshold specifically includes:
and if the gray scale is A and the preset light absorption brightness threshold is B, determining that the brightness corresponding to A and the driving current corresponding to B are the driving currents of the sub-pixel units.
The display device provided by the embodiment of the application comprises the display panel provided by the embodiment of the application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required 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 without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another display panel provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram illustrating a manufacturing method of a display panel according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram illustrating a driving method of a display panel according to an embodiment of the present disclosure.
Detailed Description
An embodiment of the present application provides a display panel, as shown in fig. 1, the display panel includes: a plurality of sub-pixel units 12, an encapsulation layer 3 sealing the sub-pixel units 12, and a saturable absorber 4 located above the encapsulation layer 3; the sub-pixel cell 12 comprises an electroluminescent device 2; the saturable absorber 4 covers at least the light emitting region of the sub-pixel unit 12; the saturable absorber 4 has a preset absorption luminance threshold, the saturable absorber 4 being configured to: and absorbing light in the sub-pixel unit 12 which is not greater than the preset light absorption brightness threshold.
It should be noted that, in the display panel provided in this embodiment of the application, the saturable absorber has a preset light absorption luminance threshold, when the light emission luminance of the electroluminescent device is lower than the preset light absorption luminance threshold, the light emitted by the electroluminescent device is absorbed by the saturable absorber, when the luminance emitted by the electroluminescent device is higher than the preset light absorption luminance, the saturable absorber cannot completely absorb the light emitted by the electroluminescent device, and when the absorbed light reaches saturation, the saturable absorber becomes transparent. For example, the preset absorption luminance threshold is 1nit (nit), the driving current of the electroluminescent device with the luminance of 1nit is a1 ampere, and then the driving current is less than a1 ampere, the sub-pixel cannot be lighted, for example, when the luminance of the light output of the sub-pixel unit is b 1nit, then the actual luminance of the electroluminescent device in the sub-pixel unit needs to be b1+1nit, and the driving current corresponding to b1+1nit needs to be provided to the electroluminescent device, that is, compared with the prior art, in the display panel provided in the embodiment of the present application, the actual luminance of the electroluminescent device in the sub-pixel unit is higher than the luminance of the sub-pixel unit, and the driving current for driving the electroluminescent device to emit light needs to meet the actual luminance of the electroluminescent device, so that the display panel provided in the embodiment of the present application can improve the driving current.
According to the display panel provided by the embodiment of the application, the saturable absorber is arranged, so that the saturable absorber can absorb light, namely, the luminance of the electroluminescent device in the sub-pixel unit is higher than the luminance of the light emitted by the sub-pixel unit, and the driving current of the electroluminescent device can be improved. The abnormal lighting of the pixels can be avoided, and the contrast of the display panel is improved. And uneven display picture caused by too low driving current of the electroluminescent device under the condition of low gray scale and difficult control can be avoided.
In fig. 1, the saturable absorber is illustrated as covering only the light emitting region of the sub-pixel unit, but of course, the saturable absorber may be arranged in other manners.
Alternatively, as shown in fig. 2, the saturable absorbers 4 of different sub-pixel units 12 are integrally connected. That is, in fig. 2, the saturable absorber 4 is provided in a whole layer.
In the display panel provided by the embodiment of the application, the whole saturated absorber layer is arranged, the process is simple, and the realization is easy.
As shown in fig. 1 to 2, the display panel further includes: a substrate 1, a pixel defining layer 8 spaced apart from the anode 5 above the substrate 1. The electroluminescent device 2 comprises: an anode 5, an organic light-emitting layer 6, and a cathode 7. In the display panel provided in the embodiment of the present application, the sub-pixel unit 12 may include: red sub-pixel unit R, green sub-pixel unit G, and blue sub-pixel unit B. The red sub-pixel unit R includes a red organic light emitting layer 9, the green sub-pixel unit G includes a green organic light emitting layer 10, and the blue sub-pixel unit B includes a blue organic light emitting layer 11. The encapsulation layer 3 may include, for example: the organic light-emitting device includes a first inorganic encapsulation layer, a second inorganic encapsulation layer, and an organic encapsulation layer between the first inorganic encapsulation layer and the second inorganic encapsulation layer. It should be noted that the sub-pixel unit further includes a thin film transistor for driving the electroluminescent device to emit light. The substrate may be, for example, a planarization layer located over the thin film transistors, the substrate also having vias (neither shown in figures 1, 2) that electrically connect the anodes to the thin film transistors.
Optionally, the material of the saturable absorber comprises: a chromium and/or cobalt doped semiconductor material.
The semiconductor material may be, for example, gallium arsenide. It should be noted that the percentage of the doping element and the thickness of the saturable absorber can be selected according to the actually required preset absorption luminance threshold.
Optionally, as shown in fig. 3, the electroluminescent device 2 further includes: a hole injection layer 13, a hole transport layer 14, an electron transport layer 15, an electron injection layer 16; the hole transport layers 14 of different sub-pixel units 12 are integrally connected.
In addition, the hole injection layer is usually doped to improve the hole injection, but this results in better conductivity of the hole transport layer, and when the hole transport layers of the sub-pixels of different colors are integrally connected, for a monochromatic image, for example, when a green sub-pixel unit needs to be lit, a small amount of holes flow into the red sub-pixel unit through the hole transport layer, so that the red sub-pixel unit is weakly lit. Therefore, other sub-pixel units around the sub-pixel unit which needs to emit light are always lighted in the low gray scale, so that the color gamut of the panel in the low gray scale is reduced.
According to the display panel provided by the embodiment of the application, due to the arrangement of the saturable absorber, even if the holes flow to other sub-pixel units which do not need to be lightened through the integrally connected hole transport layer to cause weak leakage current, light emitted by the electroluminescent device caused by the leakage current can be absorbed by the saturable absorber, namely, a light emitting user of the electroluminescent device caused by the leakage current is invisible, so that the color purity and the color gamut of a monochromatic picture under low gray scale are improved.
It should be noted that, in the display panel provided in the embodiment of the present application, the arrangement of the saturable absorber can particularly prevent the sub-pixel from being abnormally turned on due to the leakage current under low luminance, and can also reduce the difficulty in controlling the driving current of the sub-pixel unit under the low gray scale image. The saturable absorber is set for improving the low-brightness display effect, and the preset light absorption brightness threshold value is smaller, so that for the high gray scale, the light absorption of the saturable absorber is less, and the power consumption and the luminous efficiency of the display panel cannot be greatly influenced.
Based on the same inventive concept, a further embodiment of the present application provides a method for manufacturing a display panel, as shown in fig. 4, the method including:
s101, forming an electroluminescent device corresponding to the light emitting color of the sub-pixel unit on the substrate;
s102, forming an encapsulation layer for sealing the electroluminescent device;
s103, forming a saturable absorber at least covering the light emitting area of the sub-pixel unit on the packaging layer; wherein the saturable absorber has a preset absorbance luminance threshold, the saturable absorber configured to: and absorbing light which is not more than the preset light absorption brightness threshold value in the sub-pixel unit.
According to the preparation method of the display panel, the saturable absorber is arranged, so that the saturable absorber can absorb light, namely the luminance of the electroluminescent device in the sub-pixel unit is higher than the luminance of the light emitted by the sub-pixel unit, and the driving current of the electroluminescent device can be improved. The abnormal lighting of the pixels can be avoided, and the contrast of the display panel is improved. And uneven display picture caused by too low driving current of the electroluminescent device under the condition of low gray scale and difficult control can be avoided.
Optionally, the step S103 of forming a saturable absorber at least covering the light emitting region of the sub-pixel unit on the encapsulation layer specifically includes:
providing a semiconductor material target doped with chromium and/or cobalt;
and depositing the chromium and/or cobalt-doped semiconductor material target by adopting a chemical vapor deposition process to form a layer of saturable absorber.
Optionally, forming an electroluminescent device corresponding to the light emitting color of the sub-pixel unit on the substrate includes:
sequentially forming an anode, a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, an electron injection layer and a cathode on the substrate; wherein the hole transport layers of different sub-pixel units are integrally connected.
Based on the same inventive concept, an embodiment of the present application further provides a method for driving a display panel, as shown in fig. 5, the method includes:
s201, determining the gray scale of each sub-pixel unit in an image to be displayed;
s202, determining the driving current of the sub-pixel unit according to the gray scale and the preset light absorption brightness threshold;
and S203, providing the driving current to the sub-pixel unit.
According to the display panel driving method provided by the embodiment of the application, the display panel is provided with the saturable absorber which can absorb light, namely, the luminance of the electroluminescent device in the sub-pixel unit is higher than the luminance of the light emitted by the sub-pixel unit, so that compared with the prior art, for the display image with the same gray scale, the display panel driving method provided by the embodiment of the application can improve the driving current of the sub-pixel unit, can avoid abnormal lighting of pixels, and improve the contrast of the display panel. And uneven display picture caused by too low driving current of the electroluminescent device under the condition of low gray scale and difficult control can be avoided.
Optionally, determining the driving current of the sub-pixel unit according to the gray scale and the preset light absorption brightness threshold specifically includes:
and if the gray scale is A and the preset light absorption brightness threshold is B, determining that the brightness corresponding to A and the driving current corresponding to B are the driving currents of the sub-pixel units.
The embodiment of the application also provides a display device, and the display device comprises the display panel.
The display device provided by the embodiment of the application can be a mobile phone, a computer, a television and the like.
The display device provided by the embodiment of the application further comprises a driving chip, and the driving chip stores signals of driving currents of the sub-pixel units under different gray scales. Taking the case of displaying 0 to 255 gray scales as an example, the driving chip stores a driving current signal corresponding to 0 gray scale luminance + B to 255 gray scale luminance + B, where B is a preset light absorption luminance threshold of the saturable absorber.
In summary, according to the display panel, the manufacturing method thereof, the driving method thereof and the display device provided by the embodiment of the application, due to the arrangement of the saturable absorber, the saturable absorber can absorb light, that is, the luminance of the electroluminescent device in the sub-pixel unit is higher than the luminance of the electroluminescent device in the sub-pixel unit, so that the driving current of the electroluminescent device can be improved. The abnormal lighting of the pixels can be avoided, and the contrast of the display panel is improved. And uneven display picture caused by too low driving current of the electroluminescent device under the condition of low gray scale and difficult control can be avoided.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A display panel, comprising: the pixel structure comprises a plurality of sub-pixel units, an encapsulation layer for sealing the sub-pixel units, and a saturable absorber positioned on the encapsulation layer; the sub-pixel unit comprises an electroluminescent device; the saturable absorber at least covers the light emitting areas of the sub-pixel units; the saturable absorber has a preset absorbance luminance threshold, the saturable absorber configured to: and absorbing light which is not more than the preset light absorption brightness threshold value in the sub-pixel unit.
2. The display panel according to claim 1, wherein the saturable absorbers of different sub-pixel units are integrally connected.
3. The display panel according to claim 1, wherein a material of the saturable absorber comprises: a semiconductor material doped with chromium and/or cobalt.
4. The display panel according to claim 1, wherein the electroluminescent device comprises an anode, a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, an electron injection layer, and a cathode, which are sequentially stacked; the hole transport layers of different sub-pixel units are integrally connected.
5. A method for manufacturing a display panel, the method comprising:
forming an electroluminescent device corresponding to the light emitting color of the sub-pixel unit on the substrate;
forming an encapsulation layer sealing the electroluminescent device;
forming a saturable absorber at least covering the light emitting areas of the sub-pixel units on the packaging layer; wherein the saturable absorber has a preset absorbance luminance threshold, the saturable absorber configured to: and absorbing light which is not more than the preset light absorption brightness threshold value in the sub-pixel unit.
6. The method of claim 5, wherein forming a saturable absorber over the encapsulation layer at least covering the light emitting region of the sub-pixel cell comprises:
providing a semiconductor material target doped with chromium and/or cobalt;
and depositing the chromium and/or cobalt-doped semiconductor material target by adopting a chemical vapor deposition process to form a layer of saturable absorber.
7. The method of claim 5, wherein forming the electroluminescent device corresponding to the color of light emitted from the sub-pixel unit on the substrate comprises:
sequentially forming an anode, a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, an electron injection layer and a cathode on the substrate; wherein the hole transport layers of different sub-pixel units are integrally connected.
8. A method for driving a display panel according to any one of claims 1 to 4, the method comprising:
determining the gray scale of each sub-pixel unit in an image to be displayed;
determining the driving current of the sub-pixel unit according to the gray scale and the preset light absorption brightness threshold;
providing the drive current to the sub-pixel cell.
9. The method of claim 8, wherein determining the driving current of the sub-pixel unit according to the gray scale and the predetermined absorption luminance threshold comprises:
and if the gray scale is A and the preset light absorption brightness threshold is B, determining that the brightness corresponding to A and the driving current corresponding to B are the driving currents of the sub-pixel units.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 4.
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