Display panel, display module and display device

Abstract

The application provides a display panel, a display module and a display device. The display panel comprises a display substrate, a driving module located on one side of a display area along a first direction, and a plurality of sub-display areas arranged along the first direction. Each sub-display area is provided with at least three first pixel structures, second pixel structures and third pixel structures of different colors. The light-emitting efficiency of the first pixel structure is less than that of the second pixel structure and the third pixel structure. A first light-transmitting layer is located on one side of the display substrate along the thickness direction. The transmittance of the first light-transmitting layer to the light emitted by the first pixel structure in the sub-display area is less than that to the light emitted by the second pixel structure and the third pixel structure. The closer the sub-display area is to the driving module along the first direction, the smaller the transmittance of the corresponding first light-transmitting layer is. The chromaticity uniformity of the display panel is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically to a display panel, a display module, and a display device. Background Technology

[0002] The display panel includes an organic light-emitting diode (OLED) display substrate. OLEDs, with their superior properties such as high color saturation, wide viewing angle, thinness, and flexibility, have been applied in various fields including mobile phones and television displays. The display panel includes a driving substrate and organic light-emitting diodes located on the driving substrate. The driving substrate includes thin-film transistors (TFTs). Driving the TFTs generates a driving current in a saturated state, which drives the organic light-emitting diodes to emit light. Summary of the Invention

[0003] The technical problem to be solved by this invention is how to improve the color uniformity of the display panel.

[0004] To address the aforementioned technical problems, the present invention provides a display panel, comprising: a display substrate, including a display area and a driving module located on one side of the display area along a first direction; the display area includes a plurality of sub-display areas arranged along the first direction; each sub-display area is provided with at least three different colors of first pixel structure, second pixel structure and third pixel structure, wherein the luminous efficiency of the first pixel structure is less than the luminous efficiency of the second pixel structure and the third pixel structure, respectively; a first light-transmitting layer, located on one side of the display substrate along its thickness direction, wherein the transmittance of the first light-transmitting layer to the light emitted by the first pixel structure in the sub-display area is less than the transmittance to the light emitted by the second pixel structure and the third pixel structure, respectively; and the transmittance of the first light-transmitting layer corresponding to the sub-display area closer to the driving module along the first direction is smaller.

[0005] Optionally, the thickness of the first light-transmitting layer is greater for sub-display areas that are closer to the driving module in the first direction.

[0006] Optionally, the operating current of the first pixel structure is greater than the operating current of the second pixel structure and greater than the operating current of the third pixel structure.

[0007] Optionally, the material of the first light-transmitting layer includes optical adhesive.

[0008] Optionally, the first light-transmitting layer has 100% transmittance for light emitted from the second pixel structure in the sub-display area and 100% transmittance for light emitted from the third pixel structure.

[0009] Optionally, it may also include: a second light-transmitting planarization layer, wherein the second light-transmitting planarization layer has the same transmittance for the light emitted by the first pixel structure, the second pixel structure and the third pixel structure in the sub-display area.

[0010] Optionally, the second light-transmitting planarization layer has 100% transmittance across the entire wavelength range.

[0011] Optionally, the material of the second light-transmitting planarization layer includes optical adhesive.

[0012] Optionally, it may also include a polarizing layer located on the side of the second light-transmitting planarization layer opposite to the display substrate.

[0013] This application also provides a display panel, including: a display area and a driving module located on one side of the display area along a first direction, the display area including a plurality of sub-display areas arranged along the first direction; each sub-display area is provided with at least three different colors of first pixel structure, second pixel structure and third pixel structure, the luminous efficiency of the first pixel structure is less than the luminous efficiency of the second pixel structure and the third pixel structure, respectively; wherein, the thickness of the first pixel structure corresponding to the sub-display area that is closer to the driving module along the first direction is larger.

[0014] Optionally, the first pixel structure includes a stacked first hole injection layer, a first hole transport layer, a first light-emitting layer, a first electron transport layer, and a first electron injection layer; wherein, the first pixel structure includes one or more combinations of a first configuration, a second configuration, a third configuration, a fourth configuration, and a fifth configuration; wherein, the first configuration is: the thickness of the first hole injection layer corresponding to the sub-display area closer to the driving module along the first direction is larger; the second configuration is: the thickness of the first hole transport layer corresponding to the sub-display area closer to the driving module along the first direction is larger; the third configuration is: the thickness of the first light-emitting layer corresponding to the sub-display area closer to the driving module along the first direction is larger; the fourth configuration is: the thickness of the first electron transport layer corresponding to the sub-display area closer to the driving module along the first direction is larger; and the fifth configuration is: the thickness of the first electron injection layer corresponding to the sub-display area closer to the driving module along the first direction is larger.

[0015] Optionally, the emission color of the first pixel structure is blue; the plurality of sub-display areas include a first sub-display area, a second sub-display area, and a third sub-display area that are sequentially moved away from the driving module along the first direction; the thickness of the first pixel structure in the second sub-display area is greater than the thickness of the first pixel structure in the third sub-display area and less than the thickness of the first pixel structure in the first sub-display area; the vertical coordinate value of the light emitted by the first pixel structure in the second sub-display area is greater than the vertical coordinate value of the light emitted by the first pixel structure in the third sub-display area and less than the vertical coordinate value of the light emitted by the first pixel structure in the first sub-display area.

[0016] Optionally, the operating current of the first pixel structure is greater than the operating current of the second pixel structure and greater than the operating current of the third pixel structure.

[0017] This application also provides a display module, including the display panel of this application.

[0018] This application also provides a display device, including the display module of this application.

[0019] The technical solution of this invention has the following technical effects:

[0020] The present invention provides a display panel in which the luminous efficiency of the first pixel structure is lower than that of the second and third pixel structures. Correspondingly, the luminous brightness of the first pixel structure in a sub-display area closer to the driving module along the first direction is greater. The transmittance of the first light-transmitting layer to the light emitted by the first pixel structure in the sub-display area is lower than that to the second and third pixel structures. The transmittance of the first light-transmitting layer to the sub-display area closer to the driving module along the first direction is smaller. By setting the first light-transmitting layer to compensate for the difference in luminous brightness of the first pixel structures in different sub-display areas along the first direction, the uniformity of brightness of the light emitted by the first pixel structures in different sub-display areas of the display panel after passing through the first light-transmitting layer is improved, thus improving the color uniformity of the display panel.

[0021] The present invention provides another display panel in which the luminous efficiency of the first pixel structure is lower than that of the second and third pixel structures. Correspondingly, the luminous brightness of the first pixel structure in the sub-display area closer to the driving module along the first direction is greater. The thickness of the first pixel structure in the sub-display area closer to the driving module along the first direction is also greater, resulting in a larger thickness of the microcavity between the first anode and cathode layers of the first pixel structure. This increases the chromaticity coordinates of the light emitted by the first pixel structure, and consequently, the brightness of the first pixel structure in the sub-display area closer to the driving module along the first direction is greater. Thus, by setting thickness differences in the first pixel structures in different sub-display areas, the differences in luminous brightness of the first pixel structures in different sub-display areas are compensated, thereby improving the chromaticity uniformity of the first pixel structures in different sub-display areas of the display panel. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a display panel in related technologies;

[0024] Figure 2 This is a schematic diagram showing the positions of the first, second, and third zones of a display panel in related technologies.

[0025] Figure 3 A top view of the display panel in one embodiment of this application;

[0026] Figure 4 for Figure 3 A cross-sectional schematic diagram of a display panel;

[0027] Figure 5 for Figure 3 Another cross-sectional view of the display panel;

[0028] Figure 6 To form Figure 5 A schematic diagram of the vapor deposition process used in the first pixel structure, the second pixel structure, and the third pixel structure. Detailed Implementation

[0029] In the display panels of related technologies, a driving current is generated by driving thin-film transistors in a saturated state, which drives organic light-emitting diodes (OLEDs) to emit light. L = (CE)*I / S, where L is the luminance of the OLED, (CE) is the luminous efficiency of the OLED, I is the current of the OLED, and S is the pixel area of ​​the OLED. Therefore, without considering the difference in luminous efficiency of the OLEDs, the uniformity of luminance is related to the uniformity of the current flowing into the OLED. The current flows into the OLED through the driving lines. If the display area of ​​the display panel is large enough, the voltage drop U generated on the driving lines... Drop This could cause the thin-film transistor to operate in the linear region by increasing the V in the pixel circuit. DD and V SS A voltage difference can allow a thin-film transistor to operate in the saturation region, but this significantly increases the power consumption of the organic light-emitting diode. The current in the linear region of a thin-film transistor is I = [(VDD - VSS) - U]. Drop ] / R OLED ,R OLED The resistance of the organic light-emitting diode (OLED) is shown in the formula. As can be seen, the different voltage drops generated by the driving lines and the cathode of the OLED cause slight differences in the current flowing into each sub-pixel of the OLED, resulting in brightness differences in OLEDs at different distances from the driving module. For example... Figure 1 As shown, for large-size display panels, the voltage drop of the organic light-emitting diodes (OLEDs) closer to the driving module 40 is small, while the voltage drop of the OLEDs farther from the driving module 40 is large. That is, the voltage drop of the OLED in the second region 200a is greater than that of the OLED in the first region 100a, and the voltage drop of the OLED in the third region 300a is greater than that of the OLED in the second region 200a.

[0030] In related technologies, the brightness of pixels at different positions is automatically adjusted through the voltage drop compensation function of the driving module 40 to achieve brightness uniformity of the display panel. However, this approach faces a new problem: in the display panel, because blue pixels have the lowest luminous efficiency and require the highest operating current, voltage drop compensation for blue pixels is generally less effective than that for red and green pixels. Furthermore, since blue light contributes the least to white light brightness, large-size display panels exhibit better brightness uniformity for white light alone, but poorer color uniformity. (Reference) Figure 2The brightness difference between the first position 10 and the second position 20 on the display panel is 10 nits, and the brightness difference between the third position 30 and the second position 20 is also 10 nits. The color difference between the first position 10 and the second position 20 is approximately 1.5 JNCD, the color difference between the third position 30 and the second position 20 is approximately 1.5 JNCD, and the color difference between the first position 10 and the third position 30 is approximately 2.8 JNCD. This is because the blue light brightness of the first position 10 is greater than that of the second position 20, and the blue light brightness of the second position 20 is greater than that of the third position 30. This inherent difference cannot be completely eliminated by voltage drop compensation, resulting in a purplish hue at the first position 10 and a yellowish hue at the second position 20. In summary, the color uniformity of the display panel needs improvement.

[0031] Based on this, embodiments of this application provide a display panel, a display module, and a display device that improve color uniformity.

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] One embodiment of the present invention provides a display panel, in conjunction with reference to the reference. Figure 3 and Figure 4 ,include:

[0037] The display substrate W includes a display area AA and a driving module 5000 located on one side of the display area AA along the first direction X. The display area AA includes a plurality of sub-display areas A arranged along the first direction X. Each sub-display area A is provided with at least three different colors of first pixel structure 4001, second pixel structure 4002 and third pixel structure 4003. The luminous efficiency of the first pixel structure 4001 is less than that of the second pixel structure 4002 and the third pixel structure 4003, respectively.

[0038] The first light-transmitting layer 1000 is located on one side of the display substrate W along its thickness direction. The transmittance of the first light-transmitting layer 1000 to the light emitted by the first pixel structure 4001 in the sub-display area A is less than the transmittance to the light emitted by the second pixel structure 4002 and the third pixel structure 4003, respectively. The closer the sub-display area A is to the driving module 5000 along the first direction X, the smaller the transmittance of the first light-transmitting layer 1000.

[0039] In this embodiment, the luminous efficiency of the first pixel structure 4001 is lower than that of the second pixel structure 4002 and the third pixel structure 4003, respectively. Correspondingly, the luminous brightness of the first pixel structure 4001 corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater. The transmittance of the first light-transmitting layer 1000 to the light emitted by the first pixel structure 4001 in the sub-display area A is lower than that to the light emitted by the second pixel structure 4002 and the third pixel structure 4003, respectively. The transmittance of the first light-transmitting layer 1000 corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is smaller. By setting the first light-transmitting layer 1000 to compensate for the difference in luminous brightness of the first pixel structure 4001 in different sub-display areas A along the first direction X, the uniformity of the brightness of the light emitted by the first pixel structure 4001 in different sub-display areas A of the display panel after passing through the first light-transmitting layer 1000 is improved, thus improving the color uniformity of the display panel.

[0040] The display panel can be an organic light-emitting diode (OLED) display panel.

[0041] In one embodiment, the display substrate W includes: a substrate 6000; a planarization layer located on one side of the substrate 6000; a pixel defining layer located on the side of the planarization layer opposite to the substrate 6000, the pixel defining layer having a first pixel opening, a second pixel opening, and a third pixel opening; a first pixel structure 4001 located in the first pixel opening, a second pixel structure 4002 located in the second pixel opening, and a third pixel structure 4003 located in the third pixel opening; the first pixel structure 4001, the second pixel structure 4002, and the third pixel structure 4003 constitute a pixel structure unit; and an encapsulation layer 7000 located on the side of the pixel structure unit and the pixel defining layer opposite to the substrate 6000.

[0042] The first light-transmitting layer 1000 is located on the side of the encapsulation layer 7000 that faces away from the substrate 6000.

[0043] In one embodiment, the substrate 6000 includes: a substrate layer; a driving circuit layer located on one side of the substrate layer, the driving circuit layer including a thin-film transistor, and further, the driving circuit layer also including a capacitor.

[0044] In one embodiment, the first pixel structure 4001 includes a first hole injection layer, a first hole transport layer, a first light-emitting layer, a first electron transport layer, and a first electron injection layer stacked together. The second pixel structure 4002 includes a second hole injection layer, a second hole transport layer, a second light-emitting layer, a second electron transport layer, and a second electron injection layer stacked together. The third pixel structure 4003 includes a third hole injection layer, a third hole transport layer, a third light-emitting layer, a third electron transport layer, and a third electron injection layer stacked together.

[0045] In one embodiment, the display substrate W further includes: a first anode layer (not shown), a second anode layer (not shown), a third anode layer (not shown), and a cathode layer (not shown). A first pixel structure 4001 is located between the first anode layer and the cathode layer, with the first anode layer located on the side of the first pixel structure 4001 facing the planarization layer. A second pixel structure 4002 is located between the second anode layer and the cathode layer, with the second anode layer located on the side of the second pixel structure 4002 facing the planarization layer. A third pixel structure 4003 is located between the third anode layer and the cathode layer, with the third anode layer located on the side of the third pixel structure 4003 facing the planarization layer. The cathode layer is located on the side of the pixel structure unit and pixel defining layer facing away from the substrate 6000. The encapsulation layer 7000 is located on the side of the cathode layer facing away from the substrate 6000.

[0046] For example, the encapsulation layer 7000 includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. The first inorganic encapsulation layer is located on the side of the cathode facing away from the substrate 6000, the organic encapsulation layer is located on the side of the first inorganic encapsulation layer facing away from the substrate 6000, and the second inorganic encapsulation layer is located on the side of the organic encapsulation layer facing away from the first inorganic encapsulation layer. The first and second inorganic encapsulation layers can prevent moisture and oxygen from penetrating into the first pixel structure 4001, the second pixel structure 4002, and the third pixel structure 4003. The organic encapsulation layer can improve the flatness of the encapsulation layer 7000.

[0047] The luminous efficiency of the first pixel structure 4001 is lower than that of the second pixel structure 4002 and the third pixel structure 4003, respectively. For example, the first pixel structure 4001 is a blue light pixel structure, the second pixel structure 4002 is a red light pixel structure, and the third pixel structure 4003 is a green light pixel structure. The luminous efficiency of the blue light pixel structure is lower than that of the red light pixel structure and the green light pixel structure, respectively.

[0048] In other embodiments, the first pixel structure 4001, the second pixel structure 4002, and the third pixel structure 4003 may also be pixel structures of other colors.

[0049] Display area AA includes multiple sub-display areas A arranged along the first direction X. The number of sub-display areas A can be two, three, or more. In this embodiment, three sub-display areas A are used as an example. Display area AA includes a first sub-display area A1, a second sub-display area A2, and a third sub-display area A3 arranged along the first direction X. The distance from the second sub-display area A2 along the first direction X to the driving module 5000 is greater than the distance from the first sub-display area A1 along the first direction X to the driving module 5000. The distance from the third sub-display area A3 along the first direction X to the driving module 5000 is greater than the distance from the second sub-display area A2 along the first direction X to the driving module 5000.

[0050] The display area AA includes a first sub-display area to an Mth sub-display area arranged along the first direction X, where M is an integer greater than or equal to 2. In one embodiment, the display area AA is divided into a first sub-display area to an Mth sub-display area of ​​equal size along the first direction X, that is, the size of the first sub-display area along the first direction X to the size of the Mth sub-display area along the first direction X are equal.

[0051] In other embodiments, the dimensions of the first sub-display area to the Mth sub-display area are at least partially different along the first direction X.

[0052] In one embodiment, the thickness of the first light-transmitting layer 1000 is greater for sub-display areas A that are closer to the driving module 5000 along the first direction X. For example, the thickness of the first light-transmitting layer 1000 opposite to the first sub-display area A1 is greater than the thickness of the first light-transmitting layer 1000 opposite to the second sub-display area A2, and the thickness of the first light-transmitting layer 1000 opposite to the second sub-display area A2 is greater than the thickness of the first light-transmitting layer 1000 opposite to the third sub-display area A3. The difference in the thickness of the first light-transmitting layer 1000 in different sub-display areas A achieves a difference in the light transmittance of the first light-transmitting layer 1000 in different sub-display areas A, making it relatively easy to achieve this difference in light transmittance.

[0053] The transmittance of light emitted by the first pixel structure 4001 in the first light-transmitting layer 1000 in sub-display area A is less than the transmittance of light emitted by the second pixel structure 4002 and the third pixel structure 4003, respectively. For example, the transmittance of light emitted by the first pixel structure 4001 in the first light-transmitting layer 1000 in sub-display area A is 95% to 98%, for example, 97%. The transmittance of light emitted by the second pixel structure 4002 and the third pixel structure 4003 in the first light-transmitting layer 1000 in sub-display area A is 100%.

[0054] In one embodiment, the operating current of the first pixel structure 4001 is greater than the operating current of the second pixel structure 4002 and greater than the operating current of the third pixel structure 4003.

[0055] In one embodiment, the material of the first light-transmitting layer 1000 includes optical adhesive.

[0056] In one embodiment, the first light-transmitting layer 1000 has 100% transmittance for light emitted from the second pixel structure 4002 in the sub-display area A and 100% transmittance for light emitted from the third pixel structure 4003. The first light-transmitting layer 1000 has no effect on the display brightness of the second pixel structure 4002 or the third pixel structure 4003.

[0057] In one embodiment, reference Figure 4 The first light-transmitting layer 1000 includes a first sub-light-transmitting layer to an Mth sub-light-transmitting layer, where M is an integer greater than or equal to 2. M equals the number of sub-display areas A1. For example, the first light-transmitting layer 1000 includes a first sub-light-transmitting layer 1001, a second sub-light-transmitting layer 1002, and a third sub-light-transmitting layer 1003. The first sub-light-transmitting layer 1001 is located in the first sub-display area A1, the second sub-display area A2, and the third sub-display area A3. The third sub-light-transmitting layer 1003 is located in the first sub-display area A1 and the second sub-display area A2, but not in the third sub-display area A3. The third sub-light-transmitting layer 1003 is located in the first sub-display area A1, but not in the second sub-display area A2 or the third sub-display area A3.

[0058] In one embodiment, reference Figure 4 The display panel also includes a second light-transmitting planarization layer 2000, which has the same light transmittance for the first pixel structure 4001, the second pixel structure 4002, and the third pixel structure 4003 in the sub-display area A.

[0059] In one embodiment, the second light-transmitting planarization layer 2000 has 100% transmittance across the entire wavelength range, ensuring that the second light-transmitting planarization layer 2000 does not affect the overall brightness of the display panel.

[0060] In other embodiments, when the transmittance of the light emitted by the second light-transmitting planarization layer 2000 to the first pixel structure 4001, the second pixel structure 4002 and the third pixel structure 4003 in the sub-display area A is the same, the transmittance of the second light-transmitting planarization layer 2000 in the whole wavelength band may be less than 100%.

[0061] In one embodiment, the material of the second light-transmitting planarization layer 2000 includes optical adhesive.

[0062] In one embodiment, the display panel further includes a polarizer layer 3000 located on the side of the second light-transmitting planarization layer 2000 opposite to the display substrate W.

[0063] Another embodiment of this application also provides a display panel, see reference. Figure 3 and Figure 5 The system includes a display area AA and a driving module 5000 located on one side of the display area AA along the first direction X. The display area AA includes multiple sub-display areas A arranged along the first direction X. Each sub-display area A is provided with at least three different colors of first pixel structure 4001, second pixel structure 4002 and third pixel structure 4003. The luminous efficiency of the first pixel structure 4001 is less than that of the second pixel structure 4002 and the third pixel structure 4003, respectively. The thickness of the first pixel structure 4001 corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater.

[0064] In this embodiment, the luminous efficiency of the first pixel structure 4001 is lower than that of the second pixel structure 4002 and the third pixel structure 4003, respectively. Correspondingly, the luminous brightness of the first pixel structure 4001 corresponding to the sub-display area A closer to the driving module 5000 along the first direction X is greater. The thickness of the first pixel structure 4001 corresponding to the sub-display area A closer to the driving module 5000 along the first direction X is also greater, resulting in a larger thickness of the microcavity between the first anode layer and the cathode layer of the first pixel structure 4001. This increases the chromaticity coordinates of the light emitted by the first pixel structure 4001, and consequently, the brightness of the first pixel structure 4001 corresponding to the sub-display area A closer to the driving module 5000 along the first direction X is greater. Thus, by setting thickness differences in the first pixel structure 4001 in different sub-display areas A, the differences in luminous brightness of the first pixel structure 4001 in different sub-display areas A are compensated, thereby improving the chromaticity uniformity emitted by the first pixel structure 4001 in different sub-display areas A of the display panel.

[0065] The display panel can be an organic light-emitting diode (OLED) display panel.

[0066] In one embodiment, the display substrate W includes: a substrate 6000; a planarization layer located on one side of the substrate 6000; a pixel defining layer located on the side of the planarization layer opposite to the substrate 6000, the pixel defining layer having a first pixel opening, a second pixel opening, and a third pixel opening; a first pixel structure 4001 located in the first pixel opening, a second pixel structure 4002 located in the second pixel opening, and a third pixel structure 4003 located in the third pixel opening; the first pixel structure 4001, the second pixel structure 4002, and the third pixel structure 4003 constitute a pixel structure unit; and an encapsulation layer 7000 located on the side of the pixel structure unit and the pixel defining layer opposite to the substrate 6000.

[0067] In one embodiment, the substrate 6000 includes: a substrate layer; a driving circuit layer located on one side of the substrate layer, the driving circuit layer including a thin-film transistor, and further, the driving circuit layer also including a capacitor.

[0068] In one embodiment, the first pixel structure 4001 includes a first hole injection layer, a first hole transport layer, a first light-emitting layer, a first electron transport layer, and a first electron injection layer stacked together. The second pixel structure 4002 includes a second hole injection layer, a second hole transport layer, a second light-emitting layer, a second electron transport layer, and a second electron injection layer stacked together. The third pixel structure 4003 includes a third hole injection layer, a third hole transport layer, a third light-emitting layer, a third electron transport layer, and a third electron injection layer stacked together.

[0069] In one embodiment, the display substrate W further includes: a first anode layer (not shown), a second anode layer (not shown), a third anode layer (not shown), and a cathode layer (not shown). A first pixel structure 4001 is located between the first anode layer and the cathode layer, with the first anode layer located on the side of the first pixel structure 4001 facing the planarization layer. A second pixel structure 4002 is located between the second anode layer and the cathode layer, with the second anode layer located on the side of the second pixel structure 4002 facing the planarization layer. A third pixel structure 4003 is located between the third anode layer and the cathode layer, with the third anode layer located on the side of the third pixel structure 4003 facing the planarization layer. The cathode layer is located on the side of the pixel structure unit and pixel defining layer facing away from the substrate 6000.

[0070] The luminous efficiency of the first pixel structure 4001 is lower than that of the second pixel structure 4002 and the third pixel structure 4003, respectively. For example, the first pixel structure 4001 is a blue light pixel structure, the second pixel structure 4002 is a red light pixel structure, and the third pixel structure 4003 is a green light pixel structure. The luminous efficiency of the blue light pixel structure is lower than that of the red light pixel structure and the green light pixel structure, respectively.

[0071] In other embodiments, the first pixel structure 4001, the second pixel structure 4002, and the third pixel structure 4003 may also be pixel structures of other colors.

[0072] Display area AA includes multiple sub-display areas A arranged along the first direction X. The number of sub-display areas A can be two, three, or more. In this embodiment, three sub-display areas A are used as an example. Display area AA includes a first sub-display area A1, a second sub-display area A2, and a third sub-display area A3 arranged along the first direction X. The distance from the second sub-display area A2 along the first direction X to the driving module 5000 is greater than the distance from the first sub-display area A1 along the first direction X to the driving module 5000. The distance from the third sub-display area A3 along the first direction X to the driving module 5000 is greater than the distance from the second sub-display area A2 along the first direction X to the driving module 5000.

[0073] The display area AA includes a first sub-display area to an Mth sub-display area arranged along the first direction X, where M is an integer greater than or equal to 2. In one embodiment, the display area AA is divided into a first sub-display area to an Mth sub-display area of ​​equal size along the first direction X, that is, the size of the first sub-display area along the first direction X to the size of the Mth sub-display area along the first direction X are equal.

[0074] In other embodiments, the dimensions of the first sub-display area to the Mth sub-display area are at least partially different along the first direction X.

[0075] The thickness of the first pixel structure 4001 corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater. For example, the thickness of the first pixel structure 4001 corresponding to the first sub-display area A1 is greater than the thickness of the first pixel structure 4001 corresponding to the second sub-display area A2, and the thickness of the first pixel structure 4001 corresponding to the second sub-display area A2 is greater than the thickness of the first pixel structure 4001 corresponding to the third sub-display area A3.

[0076] In one embodiment, the thickness of the second pixel structure 4002 corresponding to different sub-display areas A is the same. The thickness of the third pixel structure 4003 corresponding to different sub-display areas A is the same.

[0077] In one embodiment, the first pixel structure 4001 includes one or more combinations of a first configuration, a second configuration, a third configuration, a fourth configuration, and a fifth configuration; wherein, the first configuration is: the thickness of the first hole injection layer corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater; the second configuration is: the thickness of the first hole transport layer corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater; the third configuration is: the thickness of the first light-emitting layer corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater; the fourth configuration is: the thickness of the first electron transport layer corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater; and the fifth configuration is: the thickness of the first electron injection layer corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater.

[0078] In one embodiment, the emission color of the first pixel structure 4001 is blue; wherein, the greater the thickness of the first pixel structure 4001, the greater the vertical value of the light emitted by the first pixel structure 4001 in the chromaticity coordinate system.

[0079] When the emission color of the first pixel structure 4001 is blue, the thickness of the first pixel structure 4001 and CIEy have the following relationship: CIEy=K+i*(N-T), where K and T are fixed constants, i represents the film thickness influence factor, N represents the thickness of the first pixel structure 4001, and CIEy is the vertical coordinate value of the light emitted by the first pixel structure 4001 in the chromaticity coordinate system. From the relationship, it can be seen that CIEy is related to the thickness of the first pixel structure 4001.

[0080] In one embodiment, reference Figure 6The first pixel structure 4001, the second pixel structure 4002, and the third pixel structure 4003 are formed by vapor deposition. A substrate 6000 is positioned above a vapor deposition crucible 2, and a heating source 1 is positioned below the vapor deposition crucible 2. A nozzle 3 is positioned on the side of the vapor deposition crucible 2 facing the substrate 6000, and different nozzles 3 are positioned below different sub-display areas A.

[0081] In one embodiment, the thickness of the first pixel structure 4001 in different sub-display areas A is controlled by setting different deposition rates when depositing the first pixel structure 4001 in different sub-display areas A. For example, the deposition rate of the first pixel structure 4001 corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is greater. The deposition rate of the first pixel structure 4001 corresponding to the first sub-display area A1 is greater than the deposition rate of the first pixel structure 4001 corresponding to the second sub-display area A2, and the deposition rate of the first pixel structure 4001 corresponding to the second sub-display area A2 is greater than the deposition rate of the first pixel structure 4001 corresponding to the third sub-display area A3.

[0082] In another embodiment, the thickness of the first pixel structure 4001 in different sub-display areas A is controlled by setting different apertures of the corresponding nozzles 3 when depositing the first pixel structure 4001 in different sub-display areas A. For example, the aperture of the nozzle 3 corresponding to the sub-display area A that is closer to the driving module 5000 along the first direction X is larger. The aperture of the corresponding nozzle 3 when depositing the first pixel structure 4001 in the first sub-display area A1 is larger than the aperture of the corresponding nozzle 3 when depositing the first pixel structure 4001 in the second sub-display area A2, and the aperture of the corresponding nozzle 3 when depositing the first pixel structure 4001 in the second sub-display area A2 is larger than the aperture of the corresponding nozzle 3 when depositing the first pixel structure 4001 in the third sub-display area A3.

[0083] In one embodiment, the operating current of the first pixel structure 4001 is greater than the operating current of the second pixel structure 4002 and greater than the operating current of the third pixel structure 4003.

[0084] In one embodiment, the display panel further includes a polarizer layer 3000 located on the side of the second light-transmitting planarization layer 2000 opposite to the display substrate W.

[0085] In a comparative example, the comparative example and Figure 5The difference in the embodiments is that: the thickness of the first pixel structure in different sub-display areas is the same; the vertical coordinate value of the light emitted by the first pixel structure in the first sub-display area is 0.046, the vertical coordinate value of the light emitted by the first pixel structure in the second sub-display area is 0.046, and the vertical coordinate value of the light emitted by the first pixel structure in the third sub-display area is 0.046. The brightness of the light emitted by the first pixel structure in the first sub-display area is 33.5 nits, the brightness of the light emitted by the first pixel structure in the second sub-display area is 31.7 nits, and the brightness of the light emitted by the first pixel structure in the third sub-display area is 28.5 nits. The horizontal coordinate value of the white light emitted by the first sub-display area is 0.299, the horizontal coordinate value of the white light emitted by the second sub-display area is 0.305, and the horizontal coordinate value of the white light emitted by the third sub-display area is 0.308. The white light emitted from the first sub-display area has a ordinate value of 0.312 on the chromaticity coordinate, the white light emitted from the second sub-display area has a ordinate value of 0.321 on the chromaticity coordinate, and the white light emitted from the third sub-display area has a ordinate value of 0.330 on the chromaticity coordinate. The absolute value of the color difference between the first and second sub-display areas is 1.5 JNCD, and the absolute value of the color difference between the third and second sub-display areas is 1.4 JNCD.

[0086] In the test examples of this application, the thickness of the first pixel structure in different sub-display areas is differentiated. Specifically, the first, second, and third emissive layers are set to have different thicknesses: the first emissive layer has a thickness of 9 nm, the second emissive layer has a thickness of 7 nm, and the third emissive layer has a thickness of 5 nm. The light emitted by the first pixel structure 4001 in the first sub-display area A1 has a ordinate value of 0.050 in the chromaticity coordinates, the light emitted by the first pixel structure 4001 in the second sub-display area A2 has a ordinate value of 0.046 in the chromaticity coordinates, and the light emitted by the first pixel structure 4001 in the third sub-display area A3 has a ordinate value of 0.042 in the chromaticity coordinates. The brightness of the light emitted by the first pixel structure 4001 in the first sub-display area A1 is 33.3 nits, the brightness of the light emitted by the first pixel structure 4001 in the second sub-display area A2 is 31.7 nits, and the brightness of the light emitted by the first pixel structure 4001 in the third sub-display area A3 is 28.7 nits. The white light emitted from the first sub-display area A1 has a horizontal coordinate value of 0.303, the white light emitted from the second sub-display area A2 has a horizontal coordinate value of 0.305, and the white light emitted from the third sub-display area A3 has a horizontal coordinate value of 0.307. The white light emitted from the first sub-display area A1 has a vertical coordinate value of 0.319, the white light emitted from the second sub-display area A2 has a vertical coordinate value of 0.321, and the white light emitted from the third sub-display area A3 has a vertical coordinate value of 0.324. The absolute value of the color difference between the first sub-display area A1 and the second sub-display area A2 is 0.4 JNCD, and the absolute value of the color difference between the third sub-display area A3 and the second sub-display area A2 is 0.5 JNCD.

[0087] As can be seen, in the test example, the absolute value of the color difference between the first sub-display area A1 and the second sub-display area A2 decreased relative to the comparative example, and the absolute value of the color difference between the third sub-display area A3 and the second sub-display area A2 also decreased relative to the comparative example. This indicates improved color uniformity of the display panel.

[0088] Another embodiment of this application provides a display module, including the display panel provided in the above embodiment.

[0089] Another embodiment of this application also provides a display device, including: the display module provided in the above embodiments.

[0090] Since the principle by which this display device solves the problem is similar to that of the aforementioned display module, the implementation of the display module in this display device can refer to the implementation of the aforementioned display module, and repeated details will not be repeated. This display device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of this display device are understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting the present invention.

[0091] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A display panel, characterized in that, include: The display substrate includes a display area and a driving module located on one side of the display area along a first direction. The display area includes a plurality of sub-display areas arranged along the first direction. Each sub-display area is provided with at least three different colors of first pixel structure, second pixel structure and third pixel structure. The luminous efficiency of the first pixel structure is less than that of the second pixel structure and the third pixel structure, respectively. A first light-transmitting layer is located on one side of the display substrate along its thickness direction. The transmittance of the first light-transmitting layer to the light emitted by the first pixel structure in the sub-display area is less than the transmittance to the light emitted by the second pixel structure and the third pixel structure, respectively. The transmittance of the first light-transmitting layer corresponding to the sub-display area closer to the driving module along the first direction is smaller. The thickness of the first light-transmitting layer corresponding to the sub-display area closer to the driving module along the first direction is larger. The material of the first light-transmitting layer includes optical adhesive. The transmittance of the first light-transmitting layer to the light emitted by the second pixel structure and the light emitted by the third pixel structure in the sub-display area are both 100%.

2. The display panel according to claim 1, characterized in that, The operating current of the first pixel structure is greater than the operating current of the second pixel structure and greater than the operating current of the third pixel structure.

3. The display panel according to claim 1 or 2, characterized in that, Also includes: The second light-transmitting planarization layer has the same transmittance for the light emitted by the first pixel structure, the second pixel structure, and the third pixel structure in the sub-display area.

4. The display panel according to claim 3, characterized in that, The second light-transmitting planarization layer has a transmittance of 100% across the entire wavelength range.

5. The display panel according to claim 3, characterized in that, The material of the second light-transmitting planarization layer includes optical adhesive.

6. The display panel according to claim 3, characterized in that, Also includes: A polarizing layer is located on the side of the second light-transmitting planarization layer opposite to the display substrate.

7. A display panel, characterized in that, include: A display substrate includes a display area and a driving module located on one side of the display area along a first direction. The display area includes a plurality of sub-display areas arranged along the first direction. Each sub-display area is provided with at least three different colors of first pixel structure, second pixel structure and third pixel structure. The luminous efficiency of the first pixel structure is less than that of the second pixel structure and the third pixel structure, respectively. The thickness of the first pixel structure corresponding to the sub-display area that is closer to the driving module along the first direction is greater. A first light-transmitting layer is located on one side of the display substrate along its thickness direction. The transmittance of the first light-transmitting layer to the light emitted by the first pixel structure in the sub-display area is less than the transmittance to the light emitted by the second pixel structure and the third pixel structure, respectively. The transmittance of the first light-transmitting layer corresponding to the sub-display area closer to the driving module along the first direction is smaller. The thickness of the first light-transmitting layer corresponding to the sub-display area closer to the driving module along the first direction is larger. The material of the first light-transmitting layer includes optical adhesive. The transmittance of the first light-transmitting layer to the light emitted by the second pixel structure and the light emitted by the third pixel structure in the sub-display area are both 100%.

8. The display panel according to claim 7, characterized in that, The first pixel structure includes a first hole injection layer, a first hole transport layer, a first light emission layer, a first electron transport layer, and a first electron injection layer stacked together; The first pixel structure includes one or more combinations of a first configuration, a second configuration, a third configuration, a fourth configuration, and a fifth configuration. The first configuration is that the thickness of the first hole injection layer is greater for the sub-display area that is closer to the driving module along the first direction; The second configuration is as follows: the thickness of the first hole transport layer is greater for sub-display areas that are closer to the driving module along the first direction; The third configuration is that the thickness of the first light-emitting layer is greater for the sub-display area that is closer to the driving module along the first direction; The fourth configuration is that the thickness of the first electron transport layer is greater for sub-display areas that are closer to the driving module along the first direction; The fifth configuration is that the thickness of the first electron injection layer is greater for sub-display areas that are closer to the driving module along the first direction.

9. The display panel according to claim 7, characterized in that, The first pixel structure emits blue light; the plurality of sub-display areas include a first sub-display area, a second sub-display area, and a third sub-display area that are sequentially moved away from the driving module along the first direction; the thickness of the first pixel structure in the second sub-display area is greater than the thickness of the first pixel structure in the third sub-display area but less than the thickness of the first pixel structure in the first sub-display area. Wherein, the vertical coordinate value of the light emitted by the first pixel structure of the second sub-display area in the chromaticity coordinate is greater than the vertical coordinate value of the light emitted by the first pixel structure of the third sub-display area in the chromaticity coordinate, and less than the vertical coordinate value of the light emitted by the first pixel structure of the first sub-display area in the chromaticity coordinate.

10. The display panel according to claim 7, characterized in that, The operating current of the first pixel structure is greater than the operating current of the second pixel structure and greater than the operating current of the third pixel structure.

11. A display module, characterized in that, Includes the display panel as described in any one of claims 1 to 10.

12. A display device, characterized in that, include: The display module as described in claim 11.

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