Display panel, display module and display device

Abstract

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

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel, a display module and a display device. Background Art

[0002] The display panel includes an organic light emitting diode (OLED) display substrate. Organic light emitting diodes have been applied to mobile phones, TV displays and other fields due to their excellent performance such as high color saturation, wide viewing angle, thin thickness, and flexible bending. The display panel includes a driving substrate and an organic light emitting diode located on the driving substrate. The driving substrate includes a thin film transistor. The driving current is generated by driving the thin film transistor in a saturated state, and the driving current drives the organic light emitting diode to emit light. Summary of the invention

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

[0004] In order to solve the above technical problems, the present invention provides a display panel, comprising: a display substrate, comprising a display area and a driving module located on one side of the display area along a first direction, the display area comprising a plurality of sub-display areas arranged along the first direction; each of the sub-display areas is provided with a first pixel structure, a second pixel structure and a third pixel structure of at least three different colors, the luminous efficiency of the first pixel structure is respectively lower than the luminous efficiency of the second pixel structure and the third pixel structure; a first light-transmitting layer, 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 respectively lower than the transmittance to the light emitted by the second pixel structure and the third pixel structure, and the transmittance of the first light-transmitting layer corresponding to the sub-display area that is closer to the driving module along the first direction is lower.

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

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

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

[0008] Optionally, the transmittance of the first light-transmitting layer to the light emitted by the second pixel structure in the sub-display area and the transmittance of the first light-transmitting layer to the light emitted by the third pixel structure are both 100%.

[0009] Optionally, it also includes: a second light-transmitting flat layer, the second light-transmitting flat layer having the same transmittance to 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 transmittance of the second light-transmitting flat layer in the entire wavelength band is 100%.

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

[0012] Optionally, it further includes: a polarizer layer located on a side of the second light-transmitting flat layer away from the display substrate.

[0013] The present application also provides a display panel, comprising: a display area and a driving module located on one side of the display area along a first direction, the display area comprising a plurality of sub-display areas arranged along the first direction; each of the sub-display areas is provided with a first pixel structure, a second pixel structure and a third pixel structure of at least three different colors, the luminous efficiency of the first pixel structure is respectively less than the luminous efficiency of the second pixel structure and the third pixel structure; 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 greater.

[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: a combination of one or more 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 that is closer to the driving module along the first direction is greater; the second configuration is: the thickness of the first hole transport layer corresponding to the sub-display area that is closer to the driving module along the first direction is greater; the third configuration is: the thickness of the first light-emitting layer corresponding to the sub-display area that is closer to the driving module along the first direction is greater; the fourth configuration is: the thickness of the first electron transport layer corresponding to the sub-display area that is closer to the driving module along the first direction is greater; the fifth configuration is: the thickness of the first electron injection layer corresponding to the sub-display area that is closer to the driving module along the first direction is greater.

[0015] Optionally, the luminous color of the first pixel structure is blue; the multiple sub-display areas include a first sub-display area, a second sub-display area and a third sub-display area which are sequentially away from the driving module along the first direction; the thickness of the first pixel structure of the second sub-display area is greater than the thickness of the first pixel structure of the third sub-display area and is less than the thickness of the first pixel structure of the first sub-display area; the ordinate value of the chromaticity coordinate of the light emitted by the first pixel structure of the second sub-display area is greater than the ordinate value of the chromaticity coordinate of the light emitted by the first pixel structure of the third sub-display area and is less than the ordinate value of the chromaticity coordinate of the light emitted by the first pixel structure of the first sub-display area.

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

[0017] The present application also provides a display module, including the display panel of the present application.

[0018] The present application also provides a display device, comprising the display module of the present application.

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

[0020] The technical solution of the present invention provides a display panel, wherein the luminous efficiency of the first pixel structure is respectively lower than the luminous efficiency of the second pixel structure and the third pixel structure, and accordingly, the luminous brightness of the first pixel structure corresponding to the 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 respectively lower than the transmittance to the light emitted by the second pixel structure and the third pixel structure, 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. By setting the first light-transmitting layer to compensate for the luminous brightness difference of the first pixel structures in different sub-display areas along the first direction, the brightness uniformity 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, thereby improving the chromaticity uniformity of the display panel.

[0021] In another display panel provided by the technical solution of the present invention, the luminous efficiency of the first pixel structure is respectively less than the luminous efficiency of the second pixel structure and the third pixel structure, and accordingly, the luminous brightness of the first pixel structure corresponding to the sub-display area closer to the driving module along the first direction is greater. The thickness of the first pixel structure corresponding to the sub-display area closer to the driving module along the first direction is greater, so that the thickness of the microcavity between the first anode layer and the cathode layer of the first pixel structure becomes larger, so that the chromaticity coordinates of the light emitted by the first pixel structure become larger, and accordingly, the brightness of the first pixel structure corresponding to the sub-display area closer to the driving module along the first direction is greater. In this way, by setting the thickness difference of the first pixel structure in different sub-display areas, the difference in the luminous brightness of the first pixel structures in different sub-display areas is compensated, so that the chromaticity uniformity of the first pixel structures in different sub-display areas of the display panel is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a schematic diagram of a display panel in the related art;

[0024] Figure 2 A schematic diagram of the positions of the first area, the second area and the third area of ​​a display panel in the related art;

[0025] Figure 3 A schematic top view of a display panel in an embodiment of the present application;

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

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

[0028] Figure 6 To form Figure 5 Schematic diagram of the structure of the evaporation process used in the first pixel structure, the second pixel structure and the third pixel structure. DETAILED DESCRIPTION

[0029] In the display panel of the related art, a driving current is generated by driving the thin film transistor in a saturated state, and the driving current drives the organic light emitting diode to emit light. L = (CE) * I / S, L is the luminance of the organic light emitting diode, (CE) is the luminous efficiency of the organic light emitting diode, I is the current of the organic light emitting diode, and S is the pixel area of ​​the organic light emitting diode. Therefore, without considering the difference in luminous efficiency of the organic light emitting diode, the uniformity of the luminous brightness is related to the uniformity of the current flowing into the organic light emitting diode. The current flows into the organic light emitting diode through the driving line. If the size of the display area of ​​the display panel is large enough, the voltage drop U generated on the driving line is Drop It may cause the thin film transistor to work in the linear region, by increasing the V DD and V SS The voltage difference can make the thin film transistor work in the saturation region, but this greatly increases the power consumption of the organic light emitting diode. The current I of the thin film transistor working in the linear region is [(VDD-VSS)-U Drop ] / R OLED ,R OLED is the resistance of the organic light emitting diode. From the formula, it can be seen that due to the different voltage drops generated by the driving line and the cathode of the organic light emitting diode, the current flowing into each sub-pixel of the organic light emitting diode is slightly different, and thus the organic light emitting diodes at different distances from the driving module have different brightness. Figure 1 As shown, for a large-sized display panel, the voltage drop of the organic light-emitting diode at one end close to the driving module 40 is small, and the voltage drop of the organic light-emitting diode at one end far from the driving module 40 is large, that is, the voltage drop of the organic light-emitting diode in the second area 200a is greater than the voltage drop of the organic light-emitting diode in the first area 100a, and the voltage drop of the organic light-emitting diode in the third area 300a is greater than the voltage drop of the organic light-emitting diode in the second area 200a.

[0030] In the related art, the brightness of pixels at different positions is automatically adjusted by 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, that is, in the display panel, since the blue light pixel has the lowest luminous efficiency, the blue light pixel on the display panel requires the largest working current. When compensating for the voltage drop, the voltage drop compensation of the blue light pixel is usually worse than that of the red light pixel and the green light pixel. At the same time, since the blue light contributes the least to the brightness of the white light, in terms of white light alone, the brightness uniformity of the large-size display panel is better, but the chromaticity uniformity of the display panel is poor. Reference Figure 2, the brightness difference between the first position 10 and the second position 20 of the display panel is 10nit, the brightness difference between the third position 30 and the second position 20 is 10nit, the color difference between the first position 10 and the second position 20 is about 1.5JNCD, the color difference between the third position 30 and the second position 20 is about 1.5JNCD, and the color difference between the first position 10 and the third position 30 is about 2.8JNCD. This is because the blue light brightness of the first position 10 is greater than the blue light brightness of the second position 20, the blue light brightness of the second position 20 is greater than the blue light brightness of the third position 30, and this inherent difference cannot be completely eliminated by voltage drop compensation, resulting in the chromaticity of the first position 10 being purple and the chromaticity of the second position 20 being yellow. In summary, the chromaticity uniformity of the display panel needs to be improved.

[0031] On this basis, the embodiments of the present application provide a display panel, a display module and a display device, which improve the chromaticity uniformity.

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, 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] An embodiment of the present invention provides a display panel, 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 a first pixel structure 4001, a second pixel structure 4002 and a third pixel structure 4003 of at least three different colors. The luminous efficiency of the first pixel structure 4001 is respectively less than the luminous efficiency of the second pixel structure 4002 and the third pixel structure 4003.

[0038] The first light-transmitting layer 1000 is located on one side of the display substrate W along the thickness direction thereof. 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 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 corresponding to the sub-display area A is.

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

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

[0041] In one embodiment, the display substrate W includes: a base substrate 6000; a flat layer located on one side of the base substrate 6000; a pixel defining layer located on the side of the flat layer away from the base 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; an encapsulation layer 7000, located on the side of the pixel structure unit and the pixel defining layer away from the base substrate 6000.

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

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

[0044] In one embodiment, the first pixel structure 4001 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. The second pixel structure 4002 includes a stacked 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. The third pixel structure 4003 includes a stacked 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.

[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). The first pixel structure 4001 is located between the first anode layer and the cathode layer, and the first anode layer is located on the side of the first pixel structure 4001 facing the flat layer. The second pixel structure 4002 is located between the second anode layer and the cathode layer, and the second anode layer is located on the side of the second pixel structure 4002 facing the flat layer. The third pixel structure 4003 is located between the third anode layer and the cathode layer, and the third anode layer is located on the side of the third pixel structure 4003 facing the flat layer. The cathode layer is located on the side of the pixel structure unit and the pixel defining layer away from the base substrate 6000. Among them, the encapsulation layer 7000 is located on the side of the cathode layer away from the base substrate 6000.

[0046] Exemplarily, 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 away from the substrate 6000, the organic encapsulation layer is located on the side of the first inorganic encapsulation layer away from the substrate 6000, and the second inorganic encapsulation layer is located on the side of the organic encapsulation layer away from the first inorganic encapsulation layer. The first inorganic encapsulation layer and the second inorganic encapsulation layer 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 respectively lower than the luminous efficiency of the second pixel structure 4002 and the third pixel structure 4003. Exemplarily, 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 respectively lower than the luminous efficiency of the red light pixel structure and the luminous efficiency of the green light pixel structure.

[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] The display area AA includes a plurality of sub-display areas A arranged along the first direction X. The number of the sub-display areas A may be two, three or more than four. In the present embodiment, the number of the sub-display areas A is three as an example. The 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 to the driving module 5000 along the first direction X is greater than the distance from the first sub-display area A1 to the driving module 5000 along the first direction X. The distance from the third sub-display area A3 to the driving module 5000 along the first direction X is greater than the distance from the second sub-display area A2 to the driving module 5000 along the first direction X.

[0050] The display area AA includes a first sub-display area to an M-th 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 the first sub-display area to the M-th sub-display area with equal sizes along the first direction X, that is, the size of the first sub-display area along the first direction X is equal to the size of the M-th sub-display area along the first direction X.

[0051] In other embodiments, sizes of the first to M-th sub-display areas along the first direction X are at least partially different.

[0052] In one embodiment, the thickness of the first light-transmitting layer 1000 is greater for the sub-display area A closer to the driving module 5000 along the first direction X. Exemplarily, the thickness of the first light-transmitting layer 1000 relative to the first sub-display area A1 is greater than the thickness of the first light-transmitting layer 1000 relative to the second sub-display area A2, and the thickness of the first light-transmitting layer 1000 relative to the second sub-display area A2 is greater than the thickness of the first light-transmitting layer 1000 relative 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 is used to achieve the difference in the transmittance of the first light-transmitting layer 1000 in different sub-display areas A, so that the difference in the transmittance of the first light-transmitting layer 1000 in different sub-display areas A is easier to achieve.

[0053] 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 respectively lower than the transmittance to the light emitted by the second pixel structure 4002 and the third pixel structure 4003. Exemplarily, 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 95% to 98%, for example, 97%. The transmittance of the first light-transmitting layer 1000 to the light emitted by the second pixel structure 4002 and the third pixel structure 4003 in the 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 glue.

[0056] In one embodiment, the transmittance of the first light-transmitting layer 1000 to the light emitted by the second pixel structure 4002 and the transmittance of the light emitted by the third pixel structure 4003 in the sub-display area A are both 100%. The first light-transmitting layer 1000 has no effect on the display brightness of the second pixel structure 4002 and the display brightness of 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 M-th sub-light-transmitting layer, where M is an integer greater than or equal to 2. M is equal to the number of sub-display areas A1. Exemplarily, 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 and is not located in the third sub-display area A3, and the third sub-light-transmitting layer 1003 is located in the first sub-display area A1 and is not located in the second sub-display area A2 and the third sub-display area A3.

[0058] In one embodiment, reference Figure 4 The display panel further includes a second light-transmitting flat layer 2000 , and the second light-transmitting flat layer 2000 has the same transmittance to the light emitted by 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 transmittance of the second light-transmitting flat layer 2000 in the entire wavelength band is 100%, so that the second light-transmitting flat layer 2000 does not affect the overall brightness of the display panel.

[0060] In other embodiments, when the transmittance of the second light-transmitting flat layer 2000 to the light emitted by 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 flat layer 2000 in the full band may be less than 100%.

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

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

[0063] Another embodiment of the present application further provides a display panel, referring to Figure 3 and Figure 5 , comprising: 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 comprising a plurality of sub-display areas A arranged along the first direction X; each sub-display area A is provided with a first pixel structure 4001, a second pixel structure 4002 and a third pixel structure 4003 of at least three different colors, the luminous efficiency of the first pixel structure 4001 is respectively less than the luminous efficiency of the second pixel structure 4002 and the third pixel structure 4003; wherein, 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 greater.

[0064] In this embodiment, the luminous efficiency of the first pixel structure 4001 is respectively lower than the luminous efficiency of the second pixel structure 4002 and the third pixel structure 4003. Accordingly, 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 greater, so that the thickness of the microcavity between the first anode layer and the cathode layer of the first pixel structure 4001 becomes larger, so that the chromaticity coordinates of the light emitted by the first pixel structure 4001 become larger, and accordingly, 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. In this way, by setting the thickness difference of the first pixel structure 4001 in different sub-display areas A, the luminous brightness difference of the first pixel structure 4001 in different sub-display areas A is compensated, so that the chromaticity uniformity of the first pixel structure 4001 in different sub-display areas A of the display panel is improved.

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

[0066] In one embodiment, the display substrate W includes: a base substrate 6000; a flat layer located on one side of the base substrate 6000; a pixel defining layer located on the side of the flat layer away from the base 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; an encapsulation layer 7000, located on the side of the pixel structure unit and the pixel defining layer away from the base substrate 6000.

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

[0068] In one embodiment, the first pixel structure 4001 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. The second pixel structure 4002 includes a stacked 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. The third pixel structure 4003 includes a stacked 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.

[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). The first pixel structure 4001 is located between the first anode layer and the cathode layer, and the first anode layer is located on the side of the first pixel structure 4001 facing the flat layer. The second pixel structure 4002 is located between the second anode layer and the cathode layer, and the second anode layer is located on the side of the second pixel structure 4002 facing the flat layer. The third pixel structure 4003 is located between the third anode layer and the cathode layer, and the third anode layer is located on the side of the third pixel structure 4003 facing the flat layer. The cathode layer is located on the side of the pixel structure unit and the pixel defining layer away from the base substrate 6000.

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

[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] The display area AA includes a plurality of sub-display areas A arranged along the first direction X. The number of the sub-display areas A may be two, three or more than four. In the present embodiment, the number of the sub-display areas A is three as an example. The 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 to the driving module 5000 along the first direction X is greater than the distance from the first sub-display area A1 to the driving module 5000 along the first direction X. The distance from the third sub-display area A3 to the driving module 5000 along the first direction X is greater than the distance from the second sub-display area A2 to the driving module 5000 along the first direction X.

[0073] The display area AA includes a first sub-display area to an M-th 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 the first sub-display area to the M-th sub-display area with equal sizes along the first direction X, that is, the size of the first sub-display area along the first direction X is equal to the size of the M-th sub-display area along the first direction X.

[0074] In other embodiments, sizes of the first to M-th sub-display areas along the first direction X are at least partially different.

[0075] 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 greater. Exemplarily, 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 second pixel structures 4002 corresponding to different sub-display areas A have the same thickness. The third pixel structures 4003 corresponding to different sub-display areas A have the same thickness.

[0077] In one embodiment, the first pixel structure 4001 includes: a combination of one or more of the first configuration, the second configuration, the third configuration, the fourth configuration and the 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; 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 light emitting color of the first pixel structure 4001 is blue; wherein, the greater the thickness of the first pixel structure 4001, the greater the vertical coordinate value of the chromaticity coordinate of the light emitted by the first pixel structure 4001.

[0079] When the luminous color of the first pixel structure 4001 is blue, the thickness of the first pixel structure 4001 is related to CIEy as follows: CIEy=K+i*(N-T), wherein K and T are fixed constants, i represents the film thickness influencing factor, and N represents the thickness of the first pixel structure 4001. CIEy is the vertical coordinate value of the chromaticity coordinate of the light emitted by the first pixel structure 4001. It can be seen from the relationship 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 an evaporation process. The base substrate 6000 is arranged above the evaporation crucible 2, and a heating source 1 is arranged below the evaporation crucible 2. A nozzle 3 is arranged on the side of the evaporation crucible 2 facing the base substrate 6000, and different nozzles 3 are arranged below different sub-display areas A.

[0081] In one embodiment, different evaporation rates are set when evaporating the first pixel structure 4001 in different sub-display areas A to control the first pixel structures 4001 in different sub-display areas A to have different thicknesses. Exemplarily, the evaporation rate 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 evaporation rate of the first pixel structure 4001 corresponding to the first sub-display area A1 is greater than the evaporation rate of the first pixel structure 4001 corresponding to the second sub-display area A2, and the evaporation rate of the first pixel structure 4001 corresponding to the second sub-display area A2 is greater than the evaporation rate of the first pixel structure 4001 corresponding to the third sub-display area A3.

[0082] In another embodiment, the first pixel structures 4001 in different sub-display areas A are controlled to have different thicknesses by setting different apertures of the corresponding nozzles 3 when the first pixel structures 4001 are evaporated in different sub-display areas A. Exemplarily, the aperture of the nozzle 3 corresponding to the sub-display area A closer to the driving module 5000 along the first direction X is larger. When the first pixel structure 4001 is evaporated in the first sub-display area A1, the aperture of the corresponding nozzle 3 is set to be larger than the aperture of the corresponding nozzle 3 when the first pixel structure 4001 is evaporated in the second sub-display area A2, and when the first pixel structure 4001 is evaporated in the second sub-display area A2, the aperture of the corresponding nozzle 3 is set to be larger than the aperture of the corresponding nozzle 3 when the first pixel structure 4001 is evaporated 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 a side of the second light-transmitting flat layer 2000 away from the display substrate W.

[0085] In the comparative example, the comparative example and Figure 5The difference between 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 chromaticity coordinate of the light emitted by the first pixel structure in the first sub-display area is 0.046, the vertical coordinate value of the chromaticity coordinate 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 chromaticity coordinate 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 nit, the brightness of the light emitted by the first pixel structure in the second sub-display area is 31.7 nit, and the brightness of the light emitted by the first pixel structure in the third sub-display area is 28.5 nit. The horizontal coordinate value of the chromaticity coordinate of the white light emitted by the first sub-display area is 0.299, the horizontal coordinate value of the chromaticity coordinate of the white light emitted by the second sub-display area is 0.305, and the horizontal coordinate value of the chromaticity coordinate of the white light emitted by the third sub-display area is 0.308. The ordinate value of the chromaticity coordinate of the white light emitted by the first sub-display area is 0.312, the ordinate value of the chromaticity coordinate of the white light emitted by the second sub-display area is 0.321, and the ordinate value of the chromaticity coordinate of the white light emitted by the third sub-display area is 0.330. The absolute value of the color difference between the first sub-display area and the second sub-display area is 1.5JNCD, and the absolute value of the color difference between the third sub-display area and the second sub-display area is 1.4JNCD.

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

[0087] It can be seen that 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 is reduced compared with 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 is reduced compared with the comparative example. The chromaticity uniformity of the display panel is improved.

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

[0089] Another embodiment of the present application further provides a display device, including: the display module provided by the above embodiment.

[0090] Since the principle of solving the problem of the display device is similar to that of the aforementioned display module, the implementation of the display module in the display device can refer to the implementation of the aforementioned display module, and the repeated parts will not be repeated. The display device can be: a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function. The other essential components of the display device should be understood by ordinary technicians in the field, and will not be repeated here, nor should they be used as a limitation to the present invention.

[0091] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A display panel, characterized in that: include: A display substrate, comprising a display area and a driving module located on one side of the display area along a first direction, wherein the display area comprises a plurality of sub-display areas arranged along the first direction; each of the sub-display areas is provided with a first pixel structure, a second pixel structure and a third pixel structure of at least three different colors, and the luminous efficiency of the first pixel structure is respectively less than the luminous efficiency of the second pixel structure and the third pixel structure; The first light-transmitting layer is located on one side of the display substrate along the thickness direction thereof, and 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 the transmittance to the light emitted by the second pixel structure and the third pixel structure, respectively. The closer the sub-display area is to the driving module along the first direction, the smaller the transmittance of the first light-transmitting layer corresponding to the sub-display area is.

2. The display panel according to claim 1, characterized in that: The closer the sub-display area is to the driving module along the first direction, the greater the thickness of the first light-transmitting layer is relative to the sub-display area.

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

4. The display panel according to claim 1, characterized in that: The material of the first light-transmitting layer includes optical glue.

5. The display panel according to claim 1, characterized in that: The transmittance of the first light-transmitting layer to the light emitted by the second pixel structure in the sub-display area and the transmittance of the first light-transmitting layer to the light emitted by the third pixel structure are both 100%.

6. The display panel according to any one of claims 1 to 5, characterized in that: Also includes: A second light-transmitting flat layer, wherein the second light-transmitting flat layer has the same transmittance to the light emitted by the first pixel structure, the second pixel structure and the third pixel structure in the sub-display area.

7. The display panel according to claim 6, characterized in that: The transmittance of the second light-transmitting flat layer in the entire wavelength band is 100%.

8. The display panel according to claim 6, characterized in that: The material of the second light-transmitting flat layer includes optical glue.

9. The display panel according to claim 6, characterized in that: Also includes: The polarizer layer is located on a side of the second light-transmitting flat layer away from the display substrate.

10. A display panel, characterized in that: include: A display area and a driving module located at one side of the display area along a first direction, wherein the display area includes a plurality of sub-display areas arranged along the first direction; each of the sub-display areas is provided with a first pixel structure, a second pixel structure and a third pixel structure of at least three different colors, and the luminous efficiency of the first pixel structure is respectively less than the luminous efficiency of the second pixel structure and the third pixel structure; The sub-display area that is closer to the driving module along the first direction has a greater thickness of the first pixel structure corresponding to the sub-display area.

11. The display panel according to claim 10, characterized in that: 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: a combination of one or more of the first configuration, the second configuration, the third configuration, the fourth configuration and the 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 that: 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 that: 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 that: 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; The fifth configuration is that the thickness of the first electron injection layer corresponding to the sub-display area that is closer to the driving module along the first direction is greater.

12. The display panel according to claim 10, characterized in that: The light emitting 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 which are sequentially 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; Among them, the ordinate value of the chromaticity coordinate of the light emitted by the first pixel structure in the second sub-display area is greater than the ordinate value of the chromaticity coordinate of the light emitted by the first pixel structure in the third sub-display area, and is smaller than the ordinate value of the chromaticity coordinate of the light emitted by the first pixel structure in the first sub-display area.

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

14. A display module, characterized in that: A display panel comprising any one of claims 1 to 13.

15. A display device, characterized in that: include: The display module as claimed in claim 14.

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