CN112103324A - Display device and display panel thereof - Google Patents
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- CN112103324A CN112103324A CN202011010616.9A CN202011010616A CN112103324A CN 112103324 A CN112103324 A CN 112103324A CN 202011010616 A CN202011010616 A CN 202011010616A CN 112103324 A CN112103324 A CN 112103324A
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- 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
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- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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Abstract
The invention provides a display device and a display panel thereof, wherein the display panel comprises: the display device comprises a substrate and a plurality of pixel units arranged on the substrate, wherein each pixel unit at least comprises: the light-emitting device comprises a first sub-pixel structure, a second sub-pixel structure, a third sub-pixel structure and a fourth sub-pixel structure, wherein the light-emitting color of the fourth sub-pixel structure is the same as that of the first sub-pixel structure, and the cavity length of a micro-cavity structure corresponding to the fourth sub-pixel structure is greater than that of the micro-cavity structure corresponding to the first sub-pixel structure; the light-emitting wavelength of the first sub-pixel structure is greater than that of the second sub-pixel structure, and the light-emitting wavelength of the second sub-pixel structure is greater than that of the third sub-pixel structure. According to the embodiment of the invention, the problem of color cast of white light with a large viewing angle can be improved.
Description
Technical Field
The invention relates to the technical field of display equipment, in particular to a display device and a display panel thereof.
Background
Compared with the liquid crystal and plasma displays which are widely used at present, organic light-Emitting Diode (OLED) devices are attracting attention due to their advantages of self-luminescence, rich colors, fast response speed, wide viewing angle, light weight, thin thickness, low power consumption, flexible display, etc.
Generally, OLED devices can be classified into two types, bottom-emitting OLED devices (beeds) and top-emitting OLED devices (TEOLEDs). In the TEOLED device, opaque electrodes are grown on a glass or silicon substrate, a light-emitting layer is grown, and light is emitted from a transparent or semitransparent cathode on the top when voltage is applied to the light-emitting layer. The TEOLED device has an advantage of a high aperture ratio compared to the BEOLED device, and thus is widely used.
However, in the related art, when the OLED screen is viewed at different viewing angles, the larger the viewing angle is, the larger the color variation of the screen is, i.e., the more serious the color shift problem is. For example, white light at a front viewing angle, and may be reddish or yellowish at a 45 degree viewing angle.
Disclosure of Invention
The invention provides a display device and a display panel thereof, which are used for solving the defects in the related art.
To achieve the above object, a first aspect of embodiments of the present invention provides a display panel, including: the pixel structure comprises a substrate and a plurality of pixel units arranged on the substrate, wherein each pixel unit at least comprises:
the light-emitting device comprises a first sub-pixel structure, a second sub-pixel structure, a third sub-pixel structure and a fourth sub-pixel structure, wherein the light-emitting color of the fourth sub-pixel structure is the same as that of the first sub-pixel structure, and the cavity length of a micro-cavity structure corresponding to the fourth sub-pixel structure is greater than that of the micro-cavity structure corresponding to the first sub-pixel structure; the light-emitting wavelength of the first sub-pixel structure is greater than that of the second sub-pixel structure, and the light-emitting wavelength of the second sub-pixel structure is greater than that of the third sub-pixel structure.
Optionally, the first sub-pixel structure includes a first anode, a first cathode, and a first light emitting layer located between the first anode and the first cathode, and the fourth sub-pixel structure includes a fourth anode, a fourth cathode, and a fourth light emitting layer located between the fourth anode and the fourth cathode, and a thickness of the fourth light emitting layer is greater than a thickness of the first light emitting layer.
Optionally, the first sub-pixel structure sequentially includes a first anode, a first hole injection layer, a first hole transport layer, a first electron blocking layer, a first light emitting layer, a first hole blocking layer, a first electron transport layer, a first electron injection layer, and a first cathode, and the fourth sub-pixel structure sequentially includes a fourth anode, a fourth hole injection layer, a fourth hole transport layer, a fourth electron blocking layer, a fourth light emitting layer, a fourth hole blocking layer, a fourth electron transport layer, a fourth electron injection layer, and a fourth cathode; the thickness of the fourth hole injection layer is greater than that of the first hole injection layer, and/or the thickness of the fourth hole transport layer is greater than that of the first hole transport layer, and/or the thickness of the fourth electron blocking layer is greater than that of the first electron blocking layer, and/or the thickness of the fourth light emitting layer is greater than that of the first light emitting layer, and/or the thickness of the fourth hole blocking layer is greater than that of the first hole blocking layer, and/or the thickness of the fourth electron transport layer is greater than that of the first electron transport layer, and/or the thickness of the fourth electron injection layer is greater than that of the first electron injection layer.
Optionally, a ratio of the thickness of the fourth light emitting layer to the thickness of the first light emitting layer ranges from 1.5 to 2.5.
Optionally, the first sub-pixel structure and the fourth sub-pixel structure are disposed adjacent to each other.
Optionally, each of the pixel units further includes: the light emitting color of the fifth sub-pixel structure is the same as that of the second sub-pixel structure, and the cavity length of the micro-cavity structure corresponding to the fifth sub-pixel structure is smaller than that of the micro-cavity structure corresponding to the second sub-pixel structure;
and/or a sixth sub-pixel structure, wherein the luminous color of the sixth sub-pixel structure is the same as that of the third sub-pixel structure, and the cavity length of the micro-cavity structure corresponding to the sixth sub-pixel structure is smaller than that of the micro-cavity structure corresponding to the third sub-pixel structure.
Optionally, the second sub-pixel structure includes a second anode, a second cathode, and a second light emitting layer located between the second anode and the second cathode, the fifth sub-pixel structure includes a fifth anode, a fifth cathode, and a fifth light emitting layer located between the fifth anode and the fifth cathode, and a thickness of the fifth light emitting layer is smaller than a thickness of the second light emitting layer;
or the third sub-pixel structure comprises a third anode, a third cathode and a third light-emitting layer positioned between the third anode and the third cathode, the sixth sub-pixel structure comprises a sixth anode, a sixth cathode and a sixth light-emitting layer positioned between the sixth anode and the sixth cathode, and the thickness of the sixth light-emitting layer is smaller than that of the third light-emitting layer.
Optionally, the second sub-pixel structure sequentially includes a second anode, a second hole injection layer, a second hole transport layer, a second electron blocking layer, a second light emitting layer, a second hole blocking layer, a second electron transport layer, a second electron injection layer, and a second cathode, and the fifth sub-pixel structure sequentially includes a fifth anode, a fifth hole injection layer, a fifth hole transport layer, a fifth electron blocking layer, a fifth light emitting layer, a fifth hole blocking layer, a fifth electron transport layer, a fifth electron injection layer, and a fifth cathode; the thickness of the fifth hole injection layer is smaller than that of the second hole injection layer, and/or the thickness of the fifth hole transport layer is smaller than that of the second hole transport layer, and/or the thickness of the fifth electron blocking layer is smaller than that of the second electron blocking layer, and/or the thickness of the fifth light emitting layer is smaller than that of the second light emitting layer, and/or the thickness of the fifth hole blocking layer is smaller than that of the second hole blocking layer, and/or the thickness of the fifth electron transport layer is smaller than that of the second electron transport layer, and/or the thickness of the fifth electron injection layer is smaller than that of the second electron injection layer;
or the third sub-pixel structure sequentially comprises a third anode, a third hole injection layer, a third hole transport layer, a third electron blocking layer, a third light emitting layer, a third hole blocking layer, a third electron transport layer, a third electron injection layer and a third cathode, and the sixth sub-pixel structure sequentially comprises a sixth anode, a sixth hole injection layer, a sixth hole transport layer, a sixth electron blocking layer, a sixth light emitting layer, a sixth hole blocking layer, a sixth electron transport layer, a sixth electron injection layer and a sixth cathode; the thickness of the sixth hole injection layer is smaller than that of the third hole injection layer, and/or the thickness of the sixth hole transport layer is smaller than that of the third hole transport layer, and/or the thickness of the sixth electron blocking layer is smaller than that of the third electron blocking layer, and/or the thickness of the sixth light emitting layer is smaller than that of the third light emitting layer, and/or the thickness of the sixth hole blocking layer is smaller than that of the third hole blocking layer, and/or the thickness of the sixth electron transport layer is smaller than that of the third electron transport layer, and/or the thickness of the sixth electron injection layer is smaller than that of the third electron injection layer.
Optionally, the ratio of the thickness of the fifth light emitting layer to the thickness of the second light emitting layer ranges from 0.5 to 0.8; or the ratio of the thickness of the sixth light-emitting layer to the thickness of the third light-emitting layer is 0.5-0.8.
Optionally, the second sub-pixel structure is disposed adjacent to the fifth sub-pixel structure; or the third sub-pixel structure and the sixth sub-pixel structure are arranged adjacently.
Optionally, the first sub-pixel structure and the fourth sub-pixel structure emit red light, the second sub-pixel structure emits green light, and the third sub-pixel structure emits blue light.
Optionally, an encapsulation layer is disposed on a side of the plurality of pixel units away from the substrate, and a polarizer or a color filter layer is disposed on a side of the encapsulation layer away from the substrate.
A second aspect of an embodiment of the present invention provides a display device, including: the display panel of any of the above.
In the above embodiment of the present invention, by providing the fourth sub-pixel structure, the light emitting color of the fourth sub-pixel structure is the same as the light emitting color of the first sub-pixel structure, and using that the cavity length of the micro-cavity structure corresponding to the fourth sub-pixel structure is greater than the cavity length of the micro-cavity structure corresponding to the first sub-pixel structure, on one hand, the emission wavelength of the fourth sub-pixel structure is greater than the emission wavelength of the first sub-pixel structure at the same side viewing angle, and on the second hand, the light emitting luminance attenuation rate of the fourth sub-pixel structure increases first and then decreases along with the increase of the side viewing angle, so as to compensate for the problem that the light emitting luminance of the first sub-pixel structure. The combination of color coordinate shift and brightness enhancement can improve the light with longer wavelength, such as color shift caused by too fast red brightness attenuation with the increase of viewing angle, especially the color shift problem under the large viewing angle of white light.
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 invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic top view of a display panel according to a first embodiment of the present invention;
FIG. 2 is an enlarged view of one pixel cell of FIG. 1;
FIG. 3 is a cross-sectional view taken along line AA in FIG. 2;
FIG. 4 is a color coordinate diagram of a fourth sub-pixel structure and a first sub-pixel structure at various viewing angles;
FIG. 5 is an enlarged view of the black circle of FIG. 4;
FIG. 6 is a graph showing the luminance attenuation of the emitted light when the fourth sub-pixel structure and the first sub-pixel structure emit light respectively, as a function of the viewing angle of the left-right direction from the front view;
FIG. 7 is a graph showing the color shift of a display panel and a comparison display panel in a horizontal direction and in a front view with white light, as a function of the viewing angle in a left-right direction from the front view;
FIG. 8 is a graph showing color shifts of a display panel and a comparison display panel in a vertical direction and in a front view with white light, as a function of viewing angles in a vertical direction from the front view;
FIG. 9 is a schematic cross-sectional view of a display panel according to a second embodiment of the present invention;
FIG. 10 is a schematic diagram of a top view of a pixel unit in a display panel according to a third embodiment of the present invention;
fig. 11 is a sectional view taken along the line BB in fig. 10.
List of reference numerals:
First hole injection layer HIL1 first hole transport layer HTL1
First electron blocking layer EBL1 first electron injection layer EIL1
First electron transport layer ETL1 first hole blocking layer HBL1
Second light emitting layer 112c second hole injection layer HIL2
Second hole transport layer HTL2 second electron blocking layer EBL2
Second Electron injection layer EIL2 second Electron transport layer ETL2
Second hole blocking layer HBL2 third anode 113a
Third hole injection layer HIL3 third hole transport layer HTL3
Third electron blocking layer EBL3 third electron injection layer EIL3
Third electron transport layer ETL3 third hole blocking layer HBL3
Fourth light emitting layer 114c fourth hole injection layer HIL4
Fourth hole transport layer HTL4 fourth electron blocking layer EBL4
Fourth electron injection layer EIL4 fourth electron transport layer ETL4
Fourth hole blocking layer HBL4 fifth anode 115a
Fifth cathode 115b and fifth light emitting layer 115c
Sixth light emitting layer 116c
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a schematic top view of a display panel according to a first embodiment of the invention. Fig. 2 is an enlarged view of one pixel unit in fig. 1. Fig. 3 is a sectional view taken along the AA line in fig. 2.
Referring to fig. 1 to 3, the display panel 1 includes: a substrate 10 and a plurality of pixel units 11 disposed on the substrate 10, each pixel unit 11 at least includes:
the light-emitting color of the fourth sub-pixel structure 114 is the same as that of the first sub-pixel structure 111, and the cavity length of the micro-cavity structure corresponding to the fourth sub-pixel structure 114 is longer than that of the micro-cavity structure corresponding to the first sub-pixel structure 111; the light emitting wavelength of the first sub-pixel structure 111 is greater than that of the second sub-pixel structure 112, and the light emitting wavelength of the second sub-pixel structure 112 is greater than that of the third sub-pixel structure 113.
Referring to fig. 1 to 3, the substrate 10 may be a flexible substrate or a hard substrate. The material of the flexible substrate may be polyimide and the material of the rigid substrate may be glass.
In some embodiments, a planarization layer (not shown) is disposed between the substrate 10 and the pixel unit 11.
In some embodiments, a pixel driving circuit is further disposed between the substrate 10 and the planarization layer. In other words, the light emission manner of each sub-pixel structure 111, 112, 113, 114 is Active Matrix (AM).
In some embodiments, the light emitting manner of each of the sub-pixel structures 111, 112, 113, and 114 is Passive-driven light emission ((Passive Matrix, PM) — at this time, there is no pixel driving circuit between the substrate 10 and the planarization layer.
In this embodiment, referring to fig. 3, the first sub-pixel structure 111 may include a first anode 111a, a first cathode 111b, and a first light emitting layer 111c located between the first anode 111a and the first cathode 111 b.
The second sub-pixel structure 112 may include a second anode 112a, a second cathode 112b, and a second light emitting layer 112c between the second anode 112a and the second cathode 111 b.
The third subpixel structure 113 may include a third anode 113a, a third cathode 113b, and a third light emitting layer 113c between the third anode 113a and the third cathode 113 b.
The fourth sub-pixel structure 114 may include a fourth anode 114a, a fourth cathode 114b, and a fourth light emitting layer 114c between the fourth anode 114a and the fourth cathode 114 b.
The materials of the first, second, third, and fourth light emitting layers 111c, 112c, 113c, and 114c may be organic light emitting materials (OLEDs). In this embodiment, the materials of the first light emitting layer 111c and the fourth light emitting layer 114c may be red light emitting OLEDs, the material of the second light emitting layer 112c may be green light emitting OLEDs, and the material of the third light emitting layer 113c may be red blue light emitting OLEDs. In other words, the first sub-pixel structure 111 and the fourth sub-pixel structure 114 emit red light, the second sub-pixel structure 112 emits green light, and the third sub-pixel structure 113 emits blue light. The first sub-pixel structure 111, the second sub-pixel structure 112, the third sub-pixel structure 113 and the fourth sub-pixel structure 114 of the three primary colors of red, green and blue are alternately distributed.
In other embodiments, the light emitting unit 11 may further include sub-pixel structures of other colors, which is not limited in this embodiment.
In this embodiment, two OLEDs are provided because the green emitting OLED has a short lifetime. In other embodiments, one piece may be provided.
The materials of the first anode 111a, the second anode 112a, the third anode 113a, and the fourth anode 114a may be light reflecting materials. The light reflecting material may be a material including silver (Ag) and its alloy, aluminum (Al) and its alloy, such as silver (Ag), an alloy of silver and lead (Ag: Pb), an alloy of aluminum and neodymium (Al: Nd), an alloy of silver, platinum and copper (Ag: Pt: Cu), and the like. When silver and its alloy are used as the light reflecting material, a layer of ITO, IZO or IGZO may be disposed between the first anode 111a, the second anode 112a, the third anode 113a and the fourth anode 114a, respectively, and the organic light emitting material layer.
The materials of the first cathode 111b, the second cathode 112b, the third cathode 113b, and the fourth cathode 114b may be materials (transflective materials) having a partially light-transmitting and partially light-reflecting function. The first cathode 111b, the second cathode 112b, the third cathode 113b, and the fourth cathode 114b may have a single-layer structure, and materials of the single-layer structure may include: at least one of magnesium, silver, aluminum, for example: a mixture of magnesium and silver or a mixture of aluminum and silver. The first cathode 111b, the second cathode 112b, the third cathode 113b, and the fourth cathode 114b may have a three-layer structure of a transparent conductive layer, an intermediate layer, and a transparent conductive layer. The material of the transparent conductive layer may be at least one of ITO, IZO and IGZO, and the material of the intermediate layer includes: at least one of magnesium, silver, aluminum, for example: a mixture of magnesium and silver or a mixture of aluminum and silver. In other words, the display panel 1 has a top emission structure.
In this embodiment, the first anode 111a, the second anode 112a, the third anode 113a and the fourth anode 114a are close to the substrate 10, and the first cathode 111b, the second cathode 112b, the third cathode 113b and the fourth cathode 114b are far from the substrate 10.
Referring to fig. 3, when the light emitting layer emits light, the light is reflected back and forth between the cathode and the anode (i.e., in the microcavity structure) multiple times, and finally exits from the cathode side. When emergent light is emitted, the phase difference satisfies the formula:
＝2j(λ/2)＝2ndcosθ；
wherein: j is an integer, λ is the wavelength of the emergent light, n represents the average refractive index of the medium in the microcavity structure, d is the thickness of the microcavity structure, and θ is the reflection angle.
In general, for a given device structure, the average refractive index n of the medium in the microcavity structure and the thickness d of the microcavity structure are both fixed values. Therefore, as the reflection angle theta increases, the wavelength lambda decreases, namely, as the visual angle deviated from the front view increases, the emergent light of the microcavity structure has a blue shift phenomenon.
According to the principle of a Fabry-Perot resonant cavity, the resonant cavity is formed by two parallel metal plates with high reflectivity in a relative mode, when the frequency of incident light in the resonant cavity meets the resonance condition of the resonant cavity, a transmission spectrum has a very high peak value and corresponds to very high transmissivity, and therefore the resonant cavity with the preset characteristic can enable light with corresponding wavelength to penetrate through. Because the cavity length of the Fabry-Perot resonant cavity (corresponding to the microcavity structure of the embodiment) has a corresponding relationship with the wavelength of light, the microcavity structures with different cavity lengths can only transmit light with specific wavelength.
The specific formula of the Fabry-Perot resonance equation is as follows:
wherein: ni and di represent the refractive index and thickness of the respective layers within the cavity, Σ ni × di represents the total optical thickness of the respective layers within the cavity,
and
representing the reflected phase shift of two mirrors, i.e., the anode and the cathode, m is the mode order, and λ is the wavelength of the outgoing light.
Therefore, according to the above formula, the cavity length of the microcavity structure is proportional to the wavelength λ of the transmitted light, and the larger the wavelength value of the transmitted light is, the larger the cavity length value of the microcavity structure is.
The cavity length of the micro-cavity structure corresponding to the fourth sub-pixel structure 114 is longer than the cavity length of the micro-cavity structure corresponding to the first sub-pixel structure 111, so the emission wavelength of the fourth sub-pixel structure 114 is longer than the emission wavelength of the first sub-pixel structure 111, that is, the color of the red light emitted by the former is darker.
To verify the positions of the color coordinates CIEx and CIEy of the fourth sub-pixel structure 114 and the first sub-pixel structure 111, taking the example that the thickness of the fourth light-emitting layer 114c is 2 times the thickness of the first light-emitting layer 111c in the display panel 1, fig. 4 is a color coordinate diagram at each viewing angle, and fig. 5 is an enlarged view of the black circle in fig. 4.
Referring to fig. 4 and 5, it can be seen that the color coordinate CIEx of the fourth sub-pixel structure 114 is larger relative to the first sub-pixel structure 111, which means that the color of the red light is darker.
In the display panel 1, the thickness of the fourth light-emitting layer 114c is 2 times the thickness of the first light-emitting layer 111c as an example, and fig. 6 is a graph showing a change in luminance attenuation (L-decay) of the emitted light with a viewing angle deviated from the front view in the left-right direction when the fourth sub-pixel structure 114 and the first sub-pixel structure 111 emit light, respectively. Referring to fig. 6, it can be seen that the luminance attenuation ratio of the emergent light of the fourth sub-pixel structure 114 increases and then decreases with the increase of the viewing angle from the front view, and the luminance at a large angle is also greater than the luminance at the front view of 0 °.
In one embodiment, in front view: (Viewing angle of 0 °), the luminances of the first sub-pixel structure 111, the fourth sub-pixel structure 114, the second sub-pixel structure 112, and the third sub-pixel structure 113 at the maximum luminance of white light are: 114cd/m2，1.17cd/m2，298cd/m2，23cd/m2The CIE color coordinates are (0.6871,0.312), (0.711,0.289), (0.1986,0.7601), (0.1818,0.0364), respectively. The corresponding white light color coordinates are (0.30, 0.31).
The cavity length of the micro-cavity structure corresponding to the fourth sub-pixel structure 114 is longer than the cavity length of the micro-cavity structure corresponding to the first sub-pixel structure 111 by: the thickness of the fourth light emitting layer 114c is greater than that of the first light emitting layer 111 c. In some embodiments, the ratio of the thickness of the fourth light emitting layer 114c to the thickness of the first light emitting layer 111c ranges from 1.5 to 2.5.
It should be noted that the ratio ranges in the present embodiment include the end points.
The combination of color coordinate shift and brightness enhancement can improve the light with longer wavelength, such as color shift caused by too fast red brightness attenuation with the increase of viewing angle, especially the color shift problem under the large viewing angle of white light.
To verify the above beneficial effects, taking the example that the thickness of the fourth light emitting layer 114c in the display panel 1 is 2 times the thickness of the first light emitting layer 111c, in contrast to the display panel, only the fourth sub-pixel 114 is omitted, and fig. 7 is a graph of the change of the color shift along with the viewing angle of the left-right direction deviating from the front view in the case of the front view emitting white light without changing other structures and parameters; fig. 8 is a graph showing a change in color shift depending on a viewing angle in a vertical direction from a front view in a case where white light is emitted in a front view.
In the top views shown in fig. 1 and fig. 2, the horizontal direction H is parallel to the short side direction of the first sub-pixel structure 111, and the vertical direction V is parallel to the long side direction of the first sub-pixel structure 111.
Referring to fig. 7 and 8, it can be seen that in the display panel 1, the color shift in the horizontal direction H is significantly reduced, from 14JNCD to 6JNCD, and the color shift in the vertical direction V is also reduced to some extent.
In some embodiments, a side of the plurality of pixel units 11 away from the substrate 10 may be provided with an encapsulation layer, and a side of the encapsulation layer away from the substrate 10 may be provided with a polarizer or a color filter layer.
The color filter layer includes color filter blocks corresponding to emission colors of the respective sub-pixel structures 111, 112, 113, 114, and a black matrix is provided between adjacent color filter blocks. In some embodiments, the first sub-pixel structure 111 and the fourth sub-pixel structure 114 can be disposed adjacent to each other to continuously dispose the red color filter blocks.
In some embodiments, a light extraction layer (CPL) may also be disposed between the plurality of pixel cells 11 and the encapsulation layer.
Fig. 9 is a schematic cross-sectional structure diagram of a display panel according to a second embodiment of the invention. Referring to fig. 9, the display panel 2 of the present embodiment has substantially the same structure as the display panel 1 of fig. 1 to 3, except that: in the first sub-pixel structure 111, there are further disposed between the first anode 111a and the first light emitting layer 111 c: the first hole injection layer HIL1, the first hole transport layer HTL1, and the first electron blocking layer EBL1, and the first cathode 111b and the first light emitting layer 111c are further provided with: a first electron injection layer EIL1, a first electron transport layer ETL1, and a first hole blocking layer HBL 1; in the second sub-pixel structure 112, there are further disposed between the second anode 112a and the second light-emitting layer 112 c: the second hole injection layer HIL2, the second hole transport layer HTL2, and the second electron blocking layer EBL2, and between the second cathode 112b and the second light emitting layer 112c are further disposed: a second electron injection layer EIL2, a second electron transport layer ETL2, and a second hole blocking layer HBL 2; in the third sub-pixel structure 113, there are further disposed between the third anode 113a and the third light-emitting layer 113 c: the third hole injection layer HIL3, the third hole transport layer HTL3, and the third electron blocking layer EBL3, and the third cathode 113b and the third light emitting layer 113c are further provided with: a third electron injection layer EIL3, a third electron transport layer ETL3, and a third hole blocking layer HBL 3; in the fourth sub-pixel structure 114, there are further disposed between the fourth anode 114a and the fourth light-emitting layer 114 c: a fourth hole injection layer HIL4, a fourth hole transport layer HTL4, and a fourth electron blocking layer EBL4, and a fourth light emitting layer 114c and a fourth cathode 114b are further provided therebetween: a fourth electron injection layer EIL4, a fourth electron transport layer ETL4, and a fourth hole blocking layer HBL 4.
The cavity length of the micro-cavity structure corresponding to the fourth sub-pixel structure 114 is longer than the cavity length of the micro-cavity structure corresponding to the first sub-pixel structure 111 by: the thickness of the fourth hole injection layer HIL4 is greater than the thickness of the first hole injection layer HIL1, and/or the thickness of the fourth hole transport layer HTL4 is greater than the thickness of the first hole transport layer HTL1, and/or the thickness of the fourth electron blocking layer EBL4 is greater than the thickness of the first electron blocking layer EBL1, and/or the thickness of the fourth light-emitting layer 114c is greater than the thickness of the first light-emitting layer 111c, and/or the thickness of the fourth hole blocking layer HBL4 is greater than the thickness of the first hole blocking layer HBL1, and/or the thickness of the fourth electron transport layer ETL4 is greater than the thickness of the first electron transport layer ETL1, and/or the thickness of the fourth electron injection layer EIL4 is greater than the thickness of the first electron injection layer EIL 1.
Fig. 10 is a schematic top view of a pixel unit in a display panel according to a third embodiment of the invention. Fig. 11 is a sectional view taken along the line BB in fig. 10. Referring to fig. 10 and 11, the display panel 3 of the present embodiment has substantially the same structure as the display panels 1 and 2 of fig. 1 to 3 and 9, and differs therefrom only in that: each pixel cell 11 further includes: a fifth sub-pixel structure 115, wherein the light emitting color of the fifth sub-pixel structure 115 is the same as the light emitting color of the second sub-pixel structure 112, and the cavity length of the micro-cavity structure corresponding to the fifth sub-pixel structure 115 is smaller than the cavity length of the micro-cavity structure corresponding to the second sub-pixel structure 112;
and a sixth sub-pixel structure 116, wherein the light emitting color of the sixth sub-pixel structure 116 is the same as the light emitting color of the third sub-pixel structure 113, and the cavity length of the micro-cavity structure corresponding to the sixth sub-pixel structure 116 is smaller than the cavity length of the micro-cavity structure corresponding to the third sub-pixel structure 113.
The cavity length of the micro-cavity structure corresponding to the fifth sub-pixel structure 115 is smaller than the cavity length of the micro-cavity structure corresponding to the second sub-pixel structure 112, so the emission wavelength of the fifth sub-pixel structure 115 is smaller than the emission wavelength of the second sub-pixel structure 112, that is, the color of the green light emitted by the former is darker.
In this embodiment, referring to fig. 11, the fifth sub-pixel structure 115 may include a fifth anode 115a, a fifth cathode 115b, and a fifth light emitting layer 115c between the fifth anode 115a and the fifth cathode 115 b; the sixth sub-pixel structure 116 may include a sixth anode 116a, a sixth cathode 116b, and a sixth light emitting layer 116c between the sixth anode 116a and the sixth cathode 116 b.
The cavity length of the micro-cavity structure corresponding to the fifth sub-pixel structure 115 is smaller than the cavity length of the micro-cavity structure corresponding to the second sub-pixel structure 112 by: the thickness of the fifth light emitting layer 115c is less than that of the second light emitting layer 112 c. In some embodiments, the ratio of the thickness of the fifth light emitting layer 115c to the thickness of the second light emitting layer 112c may be in the range of 0.5 to 0.8.
The cavity length of the micro-cavity structure corresponding to the sixth sub-pixel structure 116 is smaller than the cavity length of the micro-cavity structure corresponding to the third sub-pixel structure 113, so the emission wavelength of the sixth sub-pixel structure 116 is smaller than the emission wavelength of the third sub-pixel structure 113, that is, the color of the blue light emitted by the former is darker.
Since for red light the wavelength becomes shorter, the wavelength is shifted towards the sensitivity of the human eye, whereas for green and blue light the wavelength becomes shorter, the wavelength is shifted towards the insensitivity of the human eye. Therefore, the fifth sub-pixel structure 115 and the sixth sub-pixel structure 116 can reduce the sensitivity of human eyes to green light and blue light, and improve the sensitivity of human eyes to red light, thereby realizing white light balance.
The cavity length of the micro-cavity structure corresponding to the sixth sub-pixel structure 116 is smaller than the cavity length of the micro-cavity structure corresponding to the third sub-pixel structure 113 by: the thickness of the sixth light emitting layer 116c is smaller than that of the third light emitting layer 113 c. In some embodiments, the ratio of the thickness of the sixth light emitting layer 116c to the thickness of the third light emitting layer 113c may be in a range of 0.5 to 0.8.
In some embodiments, in the second sub-pixel structure 112, there are further disposed between the second anode 112a and the second light-emitting layer 112 c: the second hole injection layer HIL2, the second hole transport layer HTL2, and the second electron blocking layer EBL2, and between the second cathode 112b and the second light emitting layer 112c are further disposed: a second electron injection layer EIL2, a second electron transport layer ETL2, and a second hole blocking layer HBL 2; in the fifth sub-pixel structure 115, there are further disposed between the fifth anode 115a and the fifth light-emitting layer 115 c: a fifth hole injection layer, a fifth hole transport layer, and a fifth electron blocking layer, and further provided between the fifth cathode 115b and the fifth light emitting layer 115c are: a fifth electron injection layer, a fifth electron transport layer, and a fifth hole blocking layer.
The cavity length of the micro-cavity structure corresponding to the fifth sub-pixel structure 115 is smaller than the cavity length of the micro-cavity structure corresponding to the second sub-pixel structure 112 by: the thickness of the fifth hole injection layer is less than that of the second hole injection layer HIL2, and/or the thickness of the fifth hole transport layer is less than that of the second hole transport layer HTL2, and/or the thickness of the fifth electron blocking layer is less than that of the second electron blocking layer EBL2, and/or the thickness of the fifth light emitting layer 115c is less than that of the second light emitting layer 112c, and/or the thickness of the fifth hole blocking layer is less than that of the second hole blocking layer HBL2, and/or the thickness of the fifth electron transport layer is less than that of the second electron transport layer ETL2, and/or the thickness of the fifth electron injection layer is less than that of the second electron injection layer EIL 2.
In some embodiments, in the third sub-pixel structure 113, there is further provided between the third anode 113a and the third light-emitting layer 113 c: the third hole injection layer HIL3, the third hole transport layer HTL3, and the third electron blocking layer EBL3, and the third cathode 113b and the third light emitting layer 113c are further provided with: a third electron injection layer EIL3, a third electron transport layer ETL3, and a third hole blocking layer HBL 3; in the sixth sub-pixel structure 116, there are further provided between the sixth anode 116a and the sixth light-emitting layer 116 c: a sixth hole injection layer, a sixth hole transport layer, and a sixth electron blocking layer, and further provided between the sixth cathode 116b and the sixth light-emitting layer 116c are: a sixth electron injection layer, a sixth electron transport layer, and a sixth hole blocking layer.
The cavity length of the micro-cavity structure corresponding to the sixth sub-pixel structure 115 is smaller than the cavity length of the micro-cavity structure corresponding to the third sub-pixel structure 113 by: the thickness of the sixth hole injection layer is less than that of the third hole injection layer HIL3, and/or the thickness of the sixth hole transport layer is less than that of the third hole transport layer HTL3, and/or the thickness of the sixth electron blocking layer is less than that of the third electron blocking layer EBL3, and/or the thickness of the sixth light emitting layer 116c is less than that of the third light emitting layer 113c, and/or the thickness of the sixth hole blocking layer is less than that of the third hole blocking layer HBL3, and/or the thickness of the sixth electron transport layer is less than that of the third electron transport layer ETL3, and/or the thickness of the sixth electron injection layer is less than that of the third electron injection layer EIL 3.
In some embodiments, the fifth sub-pixel structure 115 and the sixth sub-pixel structure 116 may be alternatively disposed.
In some embodiments, a side of the plurality of pixel units 11 away from the substrate 10 may be provided with an encapsulation layer, and a side of the encapsulation layer away from the substrate 10 may be provided with a polarizer or a color filter layer.
The color filter layer includes color filter blocks corresponding to emission colors of the respective sub-pixel structures 111, 112, 113, 114, 115, 116, and a black matrix is provided between adjacent color filter blocks. In some embodiments, the second sub-pixel structure 112 and the fifth sub-pixel structure 115 can be disposed next to each other to continuously dispose the green color filter; the third sub-pixel structure 113 and the sixth sub-pixel structure 115 may be disposed adjacent to each other to continuously dispose the blue color filter blocks.
Based on the display panels 1, 2, and 3, an embodiment of the invention further provides a display device including any one of the display panels 1, 2, and 3. The display device may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.
It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intermediate layer or element may also be present. Like reference numerals refer to like elements throughout.
In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "a", "an" and "the" mean one, two or more unless expressly defined otherwise.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (11)
1. A display panel, comprising: the pixel structure comprises a substrate and a plurality of pixel units arranged on the substrate, wherein each pixel unit at least comprises:
the light-emitting device comprises a first sub-pixel structure, a second sub-pixel structure, a third sub-pixel structure and a fourth sub-pixel structure, wherein the light-emitting color of the fourth sub-pixel structure is the same as that of the first sub-pixel structure, and the cavity length of a micro-cavity structure corresponding to the fourth sub-pixel structure is greater than that of the micro-cavity structure corresponding to the first sub-pixel structure; the light-emitting wavelength of the first sub-pixel structure is greater than that of the second sub-pixel structure, and the light-emitting wavelength of the second sub-pixel structure is greater than that of the third sub-pixel structure.
2. The display panel according to claim 1, wherein the first sub-pixel structure comprises a first anode, a first cathode, and a first light emitting layer between the first anode and the first cathode, wherein the fourth sub-pixel structure comprises a fourth anode, a fourth cathode, and a fourth light emitting layer between the fourth anode and the fourth cathode, and wherein the thickness of the fourth light emitting layer is greater than the thickness of the first light emitting layer.
3. The display panel according to claim 1, wherein the first sub-pixel structure comprises, in order, a first anode, a first hole injection layer, a first hole transport layer, a first electron blocking layer, a first light emitting layer, a first hole blocking layer, a first electron transport layer, a first electron injection layer, and a first cathode, and the fourth sub-pixel structure comprises, in order, a fourth anode, a fourth hole injection layer, a fourth hole transport layer, a fourth electron blocking layer, a fourth light emitting layer, a fourth hole blocking layer, a fourth electron transport layer, a fourth electron injection layer, and a fourth cathode; the thickness of the fourth hole injection layer is greater than that of the first hole injection layer, and/or the thickness of the fourth hole transport layer is greater than that of the first hole transport layer, and/or the thickness of the fourth electron blocking layer is greater than that of the first electron blocking layer, and/or the thickness of the fourth light emitting layer is greater than that of the first light emitting layer, and/or the thickness of the fourth hole blocking layer is greater than that of the first hole blocking layer, and/or the thickness of the fourth electron transport layer is greater than that of the first electron transport layer, and/or the thickness of the fourth electron injection layer is greater than that of the first electron injection layer.
4. The display panel according to claim 2 or 3, wherein a ratio of a thickness of the fourth light-emitting layer to a thickness of the first light-emitting layer is in a range of 1.5 to 2.5.
5. The display panel of claim 1, wherein each of the pixel units further comprises: the light emitting color of the fifth sub-pixel structure is the same as that of the second sub-pixel structure, and the cavity length of the micro-cavity structure corresponding to the fifth sub-pixel structure is smaller than that of the micro-cavity structure corresponding to the second sub-pixel structure;
and/or a sixth sub-pixel structure, wherein the luminous color of the sixth sub-pixel structure is the same as that of the third sub-pixel structure, and the cavity length of the micro-cavity structure corresponding to the sixth sub-pixel structure is smaller than that of the micro-cavity structure corresponding to the third sub-pixel structure.
6. The display panel according to claim 5, wherein the second sub-pixel structure comprises a second anode, a second cathode, and a second light emitting layer between the second anode and the second cathode, wherein the fifth sub-pixel structure comprises a fifth anode, a fifth cathode, and a fifth light emitting layer between the fifth anode and the fifth cathode, and wherein the thickness of the fifth light emitting layer is smaller than that of the second light emitting layer;
or the third sub-pixel structure comprises a third anode, a third cathode and a third light-emitting layer positioned between the third anode and the third cathode, the sixth sub-pixel structure comprises a sixth anode, a sixth cathode and a sixth light-emitting layer positioned between the sixth anode and the sixth cathode, and the thickness of the sixth light-emitting layer is smaller than that of the third light-emitting layer.
7. The display panel according to claim 5, wherein the second sub-pixel structure comprises a second anode, a second hole injection layer, a second hole transport layer, a second electron blocking layer, a second light emitting layer, a second hole blocking layer, a second electron transport layer, a second electron injection layer, and a second cathode in this order, and the fifth sub-pixel structure comprises a fifth anode, a fifth hole injection layer, a fifth hole transport layer, a fifth electron blocking layer, a fifth light emitting layer, a fifth hole blocking layer, a fifth electron transport layer, a fifth electron injection layer, and a fifth cathode in this order; the thickness of the fifth hole injection layer is smaller than that of the second hole injection layer, and/or the thickness of the fifth hole transport layer is smaller than that of the second hole transport layer, and/or the thickness of the fifth electron blocking layer is smaller than that of the second electron blocking layer, and/or the thickness of the fifth light emitting layer is smaller than that of the second light emitting layer, and/or the thickness of the fifth hole blocking layer is smaller than that of the second hole blocking layer, and/or the thickness of the fifth electron transport layer is smaller than that of the second electron transport layer, and/or the thickness of the fifth electron injection layer is smaller than that of the second electron injection layer;
or the third sub-pixel structure sequentially comprises a third anode, a third hole injection layer, a third hole transport layer, a third electron blocking layer, a third light emitting layer, a third hole blocking layer, a third electron transport layer, a third electron injection layer and a third cathode, and the sixth sub-pixel structure sequentially comprises a sixth anode, a sixth hole injection layer, a sixth hole transport layer, a sixth electron blocking layer, a sixth light emitting layer, a sixth hole blocking layer, a sixth electron transport layer, a sixth electron injection layer and a sixth cathode; the thickness of the sixth hole injection layer is smaller than that of the third hole injection layer, and/or the thickness of the sixth hole transport layer is smaller than that of the third hole transport layer, and/or the thickness of the sixth electron blocking layer is smaller than that of the third electron blocking layer, and/or the thickness of the sixth light emitting layer is smaller than that of the third light emitting layer, and/or the thickness of the sixth hole blocking layer is smaller than that of the third hole blocking layer, and/or the thickness of the sixth electron transport layer is smaller than that of the third electron transport layer, and/or the thickness of the sixth electron injection layer is smaller than that of the third electron injection layer.
8. The display panel according to claim 6 or 7, wherein a ratio of a thickness of the fifth light emitting layer to a thickness of the second light emitting layer is in a range of 0.5 to 0.8; or the ratio of the thickness of the sixth light-emitting layer to the thickness of the third light-emitting layer is 0.5-0.8.
9. The display panel of claim 1, wherein the first and fourth sub-pixel structures emit red light, the second sub-pixel structure emits green light, and the third sub-pixel structure emits blue light.
10. The display panel according to claim 1, wherein a side of the pixel units away from the substrate is provided with an encapsulation layer, and a side of the encapsulation layer away from the substrate is provided with a polarizer or a color filter layer.
11. A display device, comprising: the display panel of any one of claims 1 to 10.
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