Display substrate and display panel

Abstract

The present application provides a display substrate and a display panel. The display substrate includes multiple light-emitting devices, each of which includes an anode, a cathode, and a light-emitting layer located between the anode and the cathode. At least one of the multiple light-emitting devices is a color-shifting light-emitting device. The color-shifting light-emitting device also includes a color-shifting adjustment layer located between the anode and the cathode. The color-shifting adjustment layer changes in thickness above a preset temperature range, and the optical thickness of the color-shifting adjustment layer within the preset temperature range is set so that the color-shifting light-emitting device exhibits a microcavity effect within the preset temperature range. The present application can utilize the thickness variation of the color-shifting adjustment layer to change the distance between the anode and cathode of the color-shifting light-emitting device above the preset temperature range, thereby reducing the microcavity effect of the color-shifting light-emitting device and facilitating color shift in the display substrate above the preset temperature range.

Description

Technical Field

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

[0002] With the widespread use of electronic display products in people's daily lives, users have placed increasingly higher requirements on the display performance of electronic display products.

[0003] However, the display performance of the display substrate in electronic display products often becomes unstable in high-temperature environments. For example, if the temperature is higher than the preset temperature range, the image displayed by the entire display substrate will have color deviation compared to the preset image, resulting in distortion of the displayed image and reduced contrast, which reduces the user experience. Summary of the Invention

[0004] In view of this, the present application provides a display substrate and a display panel, in which a color deviation adjustment layer is set in some light-emitting devices of the display substrate. The color deviation adjustment layer is used to adjust the microcavity effect of the light-emitting device when the temperature is higher than a preset temperature, so as to solve the problem of color deviation occurring on the display substrate when the temperature is higher than a preset range.

[0005] In a first aspect, the present application provides a display substrate comprising a plurality of light-emitting devices, each light-emitting device comprising an anode, a cathode, and a light-emitting layer positioned between the anode and the cathode, wherein at least one of the plurality of light-emitting devices is a color-shifting light-emitting device. The color-shifting light-emitting device further comprises a color-shift adjustment layer positioned between the anode and the cathode, wherein the color-shift adjustment layer changes in thickness above a preset temperature range. The optical thickness of the color-shift adjustment layer within the preset temperature range is configured such that the color-shifting light-emitting device exhibits a microcavity effect within the preset temperature range.

[0006] In the above solution, the color cast adjustment layer is used to change its thickness above a preset temperature range, thereby eliminating or weakening the microcavity effect of the color cast light emitter, thereby alleviating the color cast phenomenon of the display substrate and improving the contrast of the image displayed by the display substrate.

[0007] In a specific embodiment of the first aspect of the present application, within a preset temperature range, the total optical thickness between the anode and cathode of the color-cast light-emitting device is an integer multiple of 1 / 2 of the central wavelength of the output light of the color-cast light-emitting device.

[0008] In the above solution, the microcavity effect of the color-shifted light-emitting device is the greatest within a preset temperature range. Thus, as long as the thickness of the color-shift adjustment layer changes (increases or decreases), the effect of the microcavity effect will decrease.

[0009] In one specific embodiment of the first aspect of the present application, the color shift adjustment layer is formed by mixing a heat-sensitive thickness-changing material into a main film layer, wherein the heat-sensitive thickness-changing material changes thickness when the temperature exceeds a predetermined temperature range. For example, the ratio of the first thickness of the heat-sensitive thickness-changing material to the second thickness of the main film layer is in a range of 1 / 99 to 1 / 9.

[0010] In a specific embodiment of the first aspect of the present application, the material whose thickness changes when heated is a thermal expansion material. When the thermal expansion material is above a preset temperature range, the thickness increases with increasing temperature.

[0011] In a specific embodiment of the first aspect of the present application, the material whose thickness changes when heated is a negative thermal expansion material. When the temperature of the negative thermal expansion material is higher than a preset temperature range, the thickness of the negative thermal expansion material decreases as the temperature increases.

[0012] In a specific embodiment of the first aspect of the present application, the average linear expansion coefficient of the negative thermal expansion material is in the range of -2000×10 -6 / ℃~-100×10 -6 / ℃.

[0013] In a specific embodiment of the first aspect of the present application, the main film layer is at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer.

[0014] In the above scheme, the setting of the color deviation adjustment layer will not change the module structure of the light-emitting device, that is, the type and stacking relationship of the original film layer will not be affected, which is conducive to saving design costs and avoiding the risk of problems such as changes in driving voltage and unstable luminous efficiency due to changes in the module structure.

[0015] In a specific embodiment of the first aspect of the present application, each light-emitting device also includes a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer stacked in sequence from the anode to the cathode, and a color deviation adjustment layer is arranged between any two adjacent structures among the anode, the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer, the electron injection layer and the cathode. For example, further, each light-emitting device also includes an electron blocking layer located between the anode and the light-emitting layer and a hole blocking layer located between the cathode and the light-emitting layer, and the color deviation adjustment layer is arranged between any two adjacent structures among the anode, the hole injection layer, the hole transport layer, the electron blocking layer, the light-emitting layer, the hole blocking layer, the electron transport layer, the electron injection layer and the cathode.

[0016] In the above solution, the color deviation adjustment layer is provided separately, which can reduce the risk of adverse effects on the performance of the functional film layers such as the hole injection layer due to the doping of materials whose thickness changes when heated.

[0017] In a specific embodiment of the first aspect of the present application, a plurality of light-emitting devices are classified into light-emitting devices that can emit blue light, light-emitting devices that can emit red light, and light-emitting devices that can emit green light, and the color-cast light-emitting device is any one of the light-emitting devices that can emit blue light, the light-emitting devices that can emit red light, and the light-emitting devices that can emit green light.

[0018] A second aspect of the present application provides a display panel, which includes the display substrate in any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic diagram of the planar structure of a display substrate provided in one embodiment of the present application.

[0020] Figure 2 Shown Figure 1 The figure shows a partial enlarged cross-sectional schematic diagram of the A region of the display substrate taken along line BB'.

[0021] Figure 3 As shown, Figure 1 The diagram shows another partially enlarged cross-sectional view of region A of the substrate taken along line BB'.

[0022] Figure 4 As shown, Figure 1 The diagram shows another partial enlarged cross-sectional view taken along line BB' within region A of the display substrate.

[0023] Figure 5 Shown is a schematic cross-sectional view of a partial structure of a color-biased light-emitting device of a display substrate provided by an embodiment of the present application.

[0024] Figure 6 As shown, Figure 1 The diagram shows another partial enlarged cross-sectional view taken along line BB' within region A of the display substrate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] During the light-emitting process, the display substrate generates heat, which causes the temperature to rise. When the temperature rises to above the preset temperature range, the brightness of the light emitted by the light-emitting device of the display substrate will change, so that the image displayed by the entire display substrate will have a color deviation compared to the preset image. The reason for this phenomenon is that when the temperature is higher than the preset temperature range, as the temperature rises, the brightness corresponding to the light-emitting device in the display substrate will increase, which will cause the color displayed by the light-emitting device of the display substrate above the preset temperature range to deviate from the color displayed within the preset temperature range, thereby causing the image displayed by the display substrate to have a color deviation. It should be noted that the light-emitting device whose color of the emitted light corresponds to the main color of the color deviation can be called a color deviation light-emitting device. The main color of the color deviation can be blue, red, green or yellow, etc. The original display substrate is the display substrate before the technical solution of the present application is used for improvement.

[0027] In order to at least solve the above-mentioned problems, the present application specifically sets a color deviation adjustment layer between the cathode and anode of a color deviation light-emitting device that emits light corresponding to the color deviation, and sets the color deviation adjustment layer to change in thickness when the temperature is above the preset temperature range, so that when the temperature is above the preset temperature range, the distance between the anode and cathode of the color deviation light-emitting device is changed by the thickness change, thereby weakening the microcavity effect of the color deviation light-emitting device, thereby reducing the corresponding brightness of the color deviation light-emitting device, and also reducing the deviation between the color displayed by the display substrate when the temperature is above the preset temperature range and the color displayed within the preset temperature range, effectively improving the color deviation phenomenon of the original display substrate, thereby stabilizing the display performance of the display substrate and improving the user experience. In the case where the color deviation light-emitting device is not designed with a color deviation adjustment layer, the original display substrate will have a color deviation when the temperature is above the preset temperature range, and the main color of the color deviation is the same or approximately the same as the preset light output color of the color deviation light-emitting device.

[0028] At least one embodiment of the present application provides a display substrate. Figure 1 Shown is a top view of a display substrate provided in one embodiment of the present application.

[0029] like Figure 1 As shown, the display substrate 100 has a display area 10 and a wiring area 20. The display area 10 is used to display images. The wiring area 20 is used to provide signal lines for applying signals to the display area 10. In addition to the display area 10 and the wiring area 20, the display substrate 100 may also have a binding area or a bending area. The light extraction method of the display substrate 100 can be bottom-emitting or top-emitting.

[0030] The display substrate 100 may include a plurality of light emitting devices 110 . The plurality of light emitting devices 110 may be located in the display area 10 . At least one of the plurality of light emitting devices 110 is a color-shifted light emitting device that emits light of a corresponding color shift.

[0031] If the plurality of light-emitting devices 110 are of a single type, where a single type of light-emitting device is a light-emitting device capable of emitting light of a single color, then the at least one color-biased light-emitting device may be all of the plurality of light-emitting devices 110, for example, all of the light-emitting devices are color-biased light-emitting devices. If the plurality of light-emitting devices 110 are of different types, where different types of light-emitting devices are light-emitting devices capable of emitting light of different colors, then the at least one color-biased light-emitting device emitting light of corresponding color bias may be a light-emitting device emitting light of the same color among the plurality of light-emitting devices 110.

[0032] Figure 2 Shown Figure 1 The diagram shows a partially enlarged cross-sectional view of the display substrate taken along line BB' in region A. The position of region A in the display area is merely schematic and can be adaptively adjusted. Figure 2 The display substrate 100A shown in the figure takes the multiple light-emitting devices as an example of a single type of light-emitting devices.

[0033] like Figure 2 As shown, the display substrate 100A includes a plurality of light-emitting devices 110. Each light-emitting device 110 includes an anode 1101, a cathode 1110, and a light-emitting layer 1105 located between the anode 1101 and the cathode 1110. The plurality of light-emitting devices 110 are color-shifting light-emitting devices 111 that emit light of a corresponding color shift. The color-shifting light-emitting device 111 also includes a color-shifting adjustment layer 1102 located between the anode 1101 and the cathode 1110. The color-shifting adjustment layer 1102 changes in thickness above a preset temperature range. The optical thickness T1 of the color-shifting adjustment layer 1102 within the preset temperature range is set so that the color-shifting light-emitting device 111 exhibits a microcavity effect within the preset temperature range.

[0034] It should be noted that, in the embodiments of the present application, "optical thickness" is the product of the geometric thickness of the structure and the refractive index, and "total optical thickness" is the sum of the optical thicknesses of multiple structures.

[0035] It should be understood that the color shift adjustment layer 1102 can be located between the anode 1101 and the light-emitting layer 1105, or between the light-emitting layer 1105 and the cathode 1110. The location of the color shift adjustment layer 1102 between the anode 1101 and the cathode 1110 in each color-shifted light-emitting device 111 can be the same or different.

[0036] A pixel defining layer may be further provided between two adjacent light emitting devices 110 in the plurality of light emitting devices 110. The cathode 1110 in each of the plurality of light emitting devices 110 may be as follows: Figure 2 As shown, the light emitting devices share the same cathode layer, and the cathodes between any two adjacent light emitting devices in all the light emitting devices may be separated by a pixel defining layer.

[0037] The preset temperature range can be determined based on the temperature at which the color-shifted light-emitting device produces color shift. The structure of the color-shifted light-emitting device 111 can form an optical microcavity within the preset temperature range. When the optical thickness of the color-shift adjustment layer 1102 within the preset temperature range is T1, the optical microcavity can have a microcavity effect. Assuming that the total optical thickness of the optical microcavity is T 总 The central wavelength of the emitted light of the color-biased light emitting device 111 is λ. When the temperature is within the preset range, the total optical thickness T of the optical microcavity is 总 Satisfy formula T 总 =m×(λ / 2), and when m is a positive integer, the optical microcavity has a microcavity effect, which can enhance the emission intensity at the optical microcavity emission peak, narrow the emission peak spectrum, and move the emission peak, thereby enhancing the brightness of the output light of the color-biased light-emitting device 111, and significantly improving the color purity of the output light of the color-biased light-emitting device 111.

[0038] For example, the structure of the color-biased light emitting device 111 can be a metal-Buglar distributed reflector structure, thereby forming an optical microcavity. Figure 2 The display substrate 100A may further include a Bouguerra distribution reflector 120, which is disposed on a side of the anode 1101 away from the cathode 1110. The metal in the metal-Bouguerra distribution reflector structure may refer to a metal-based cathode 1110. The total optical thickness T of the optical microcavity within a preset temperature range is 总 is the optical length between the cathode 1110 and the Bouguerre distribution reflector 120 in the color-biased light-emitting device 111. 总 =m×(λ / 2), the optical microcavity has a microcavity effect. It should be understood that the structure of the color-biased light-emitting device 111 can also be a metal-metal structure or a metal-indium tin oxide structure, as long as it can form an optical microcavity.

[0039] The total optical thickness of the optical microcavity corresponding to the color-biased light-emitting device 111 within the preset temperature range is equal to T 总 If the color deviation adjustment layer 1102 changes thickness when the temperature is higher than the preset temperature range, the optical thickness of the color deviation light emitting device 111 will change from T1 to T2 when the temperature is higher than the preset temperature range, and T2 will be greater than or less than T1, so that the total optical thickness will also change from T 总 Change to T总 ', thus making T 总 '≠m×(λ / 2), thereby weakening the microcavity effect of the color-cast light-emitting device 111 within a preset temperature range and reducing the corresponding brightness of the color-cast light-emitting device.

[0040] According to the technical solution provided in the embodiments of the present application, a color-shift adjustment layer is provided between the cathode and anode of a color-shift light-emitting device, and the thickness of the color-shift adjustment layer is varied when the temperature exceeds a preset temperature range. Thus, when the temperature exceeds the preset temperature range, the distance between the anode and cathode of the color-shift light-emitting device is changed by the thickness variation, thereby reducing the microcavity effect of the color-shift light-emitting device, thereby reducing the brightness of the color-shift light-emitting device. This reduced brightness and the increased brightness of the color-shift light-emitting device due to the increase in temperature will have a destructive effect, thereby reducing the deviation between the color displayed by the display substrate when the temperature exceeds the preset temperature range and the color displayed within the preset temperature range, thereby improving the color shift of the original display substrate when the temperature exceeds the preset temperature range. In addition, because the color-shift adjustment layer is a film layer different from the light-emitting layer, it does not affect the properties of the light-emitting layer, such as carrier transport or heat resistance.

[0041] If the multiple light-emitting devices 110 are of different types (e.g., emitting light of different colors), color cast is related to the brightness increase ratios corresponding to the different types of light-emitting devices. The brightness of different types of light-emitting devices increases at different rates as temperature increases, meaning the brightness increases of the different light-emitting devices are unbalanced, resulting in a color cast. For example, assuming the display substrate displays white light within a preset temperature range, the white light can be mixed according to the brightness ratio. When the brightness of green light is 69%, the brightness of red light is 21%, and the brightness of blue light is 10%, the human eye perceives the mixed light as pure white. If the temperature exceeds the preset temperature range, the brightness increase ratio of light-emitting devices that emit blue light is higher than the brightness increase ratios of other light-emitting devices that emit light other than blue, resulting in a bluish tint on the image displayed by the display substrate. If the temperature exceeds the preset temperature range, the brightness increase ratio of light-emitting devices that emit red light is higher than the brightness increase ratios of light-emitting devices that emit light of other colors other than red, resulting in a reddish tint on the image displayed by the display substrate.

[0042] Figure 3 As shown, Figure 1 The diagram shows another partially enlarged cross-sectional view of region A of the substrate taken along line BB'. Figure 3 The embodiment shown is Figure 2 This is a variation of the embodiment shown. The similarities are not repeated here, and the differences are described in detail here. Figure 3 The illustrated example takes the multiple light-emitting devices 100 as different types of light-emitting devices.

[0043] In a specific embodiment of the present application, the display substrate 100B may include a plurality of light-emitting devices 110, wherein the plurality of light-emitting devices 110 are classified into a light-emitting device 110a capable of emitting blue light, a light-emitting device 110b capable of emitting red light, and a light-emitting device 110c capable of emitting green light, and the color-biased light-emitting device 111 is any one of the light-emitting device 110a capable of emitting blue light, the light-emitting device 110b capable of emitting red light, and the light-emitting device 110c capable of emitting green light. Figure 3 , Figure 3 In the embodiment shown, the color-biased light-emitting device 111 is a light-emitting device 110a that can emit blue light. It should be understood that the display substrate 100B may further include a substrate 130 for supporting the plurality of light-emitting devices 110. For example, the substrate 130 may be an array substrate.

[0044] In some embodiments, the color cast state of the display substrate 100B when the temperature is above a preset temperature range can be determined. If the color cast state of the display substrate 100B is blue, the color-cast light-emitting device 111 emitting light of the corresponding color cast can be determined to be the light-emitting device 110a that can emit blue light. The color-cast adjustment layer 1102 can then be disposed between the cathode and anode of the light-emitting device 110a that can emit blue light, thereby specifically reducing the microcavity effect of the light-emitting device that can emit blue light. It should be understood that if the color cast state of the display substrate 100B is red, the color-cast adjustment layer 1102 can be disposed between the cathode and anode of the light-emitting device 110b that can emit red light. If the color cast state of the display substrate 100B is green, the color-cast adjustment layer 1102 can be disposed between the cathode and anode of the light-emitting device 110c that can emit green light. The disposition of the color shift adjustment layer 1102 in the light emitting device 110b capable of emitting red light or the light emitting device 110c capable of emitting green light is similar to that in the light emitting device 110a capable of emitting blue light, and will not be repeated here.

[0045] It should be understood that the plurality of light-emitting devices 100 may also include light-emitting devices that can emit white light, and may further include light-emitting devices that can emit yellow light. The color-biased light-emitting device 111 may also be a light-emitting device that can emit yellow light, and so on.

[0046] According to the technical solution provided in the embodiments of the present application, when multiple light-emitting devices are different types of light-emitting devices, a color-biased light-emitting device that emits light of corresponding color bias is provided with a color-biased adjustment layer, thereby specifically weakening the microcavity effect of the color-biased light-emitting device. When the temperature is higher than a preset temperature range, the distance between the anode and the cathode of the color-biased light-emitting device is changed by utilizing thickness variation, thereby weakening the microcavity effect of the color-biased light-emitting device, thereby reducing the corresponding brightness of the color-biased light-emitting device, and achieving a balance between the corresponding brightness enhancement ratios of different types of light-emitting devices, which is beneficial to improving the color bias that occurs on the original display substrate when the temperature is higher than the preset temperature range.

[0047] In a specific embodiment of the present application, within a preset temperature range, the total optical thickness T between the anode 1101 and the cathode 1110 of the color-biased light-emitting device 111 is 总 , which is an integer multiple of 1 / 2 of the central wavelength λ of the output light of the color-biased light-emitting device.

[0048] refer to Figure 3 The total optical thickness between the anode 1101 and the cathode 1110 of the color-biased light-emitting device 111 is T 总 , and satisfy the formula T 总 =m×(λ / 2).

[0049] Specifically, the structure of the color-shifting light-emitting device 111 can be a metal-indium tin oxide structure, thereby forming an optical microcavity. The metal in the metal-indium tin oxide structure refers to the metal-based cathode 1110, and the indium tin oxide refers to the anode 1101 based on indium tin oxide (ITO). When the color shift adjustment layer 1102 changes in thickness above a preset temperature range, the total optical thickness T between the anode 1101 and the cathode 1110 is 100%. 总 Will change to T 总 ', T 总 'will be greater or less than T 总 , so T 总 '≠m×(λ / 2).

[0050] In the embodiments of the present application, by setting the total optical thickness between the anode and cathode of a color-biased light-emitting device to an integral multiple of ½ the central wavelength of the light emitted by the color-biased light-emitting device, an optical microcavity is formed between the anode and cathode of the color-biased light-emitting device, thereby achieving a microcavity effect. Furthermore, compared to forming an optical microcavity using a metal-Buglar distributed reflector structure, this facilitates achieving a microcavity effect within a predetermined temperature range while simplifying the structure of the color-biased light-emitting device.

[0051] Figure 4 As shown, Figure 1 The diagram shows another partial enlarged cross-sectional view taken along line BB' within region A of the display substrate. Figure 4 The embodiment shown is Figure 3 The examples of the embodiments shown are not described in detail, and the differences are described here in detail.

[0052] In a specific embodiment of the present application, each light-emitting device further includes a stacked hole injection layer 1103, a hole transport layer 1104, an electron transport layer 1108 and an electron injection layer 1109, and the color deviation adjustment layer 1102 is arranged between any two adjacent structures among the anode 1101, the hole injection layer 1103, the hole transport layer 1104, the light-emitting layer 1105, the electron transport layer 1108, the electron injection layer 1109 and the cathode 1110.

[0053] In a specific embodiment of the present application, each light-emitting device further includes an electron blocking layer 1106 located between the anode 1101 and the light-emitting layer 1105 and a hole blocking layer 1107 located between the cathode 1110 and the light-emitting layer 1105, and the color deviation adjustment layer 1102 is arranged between any two adjacent structures among the anode 1101, the hole injection layer 1103, the hole transport layer 1104, the electron blocking layer 1106, the light-emitting layer 1105, the hole blocking layer 1107, the electron transport layer 1108, the electron injection layer 1109 and the cathode 1110.

[0054] refer to Figure 4 , Figure 4 In the display substrate 100C shown, the color shift adjustment layer 1102 is disposed between the electron blocking layer 1106 and the light emitting layer 1105 as an example.

[0055] It should be understood that Figure 4 The illustration is merely exemplary. Under the condition that the color deviation adjustment layer 1102 is located between the anode and the cathode, the specific position of the color deviation adjustment layer 1102 in the light-emitting device of the display substrate 100C can be adjusted according to actual needs.

[0056] It should be understood that the anode 1101, the hole injection layer 1103, the hole transport layer 1104, the electron blocking layer 1106, the light emitting layer 1105, the hole blocking layer 1107, the electron transport layer 1108, the electron injection layer 1109 and the cathode 1110 can be arranged as follows: Figure 4 The stacking arrangement shown may also be configured in other ways, such as by positioning the electron blocking layer 1106 between the hole injection layer 1103 and the hole transport layer 1104. The stacking arrangement may be adjusted based on actual needs. Each light-emitting device may include any one or more of the hole injection layer 1103, the hole transport layer 1104, the electron blocking layer 1106, the hole blocking layer 1107, the electron transport layer 1108, and the electron injection layer 1109.

[0057] According to the technical solution provided in the embodiments of the present application, by arranging the color deviation adjustment layer between any two adjacent structures among the anode, hole injection layer, hole transport layer, electron blocking layer, light-emitting layer, hole blocking layer, electron transport layer, electron injection layer and cathode, it is possible to ensure that the film layers of the original display substrate are not changed, and the color deviation adjustment layer is used to enable the color deviation light emitting device to have a microcavity effect within a preset temperature range. At the same time, the thickness change of the color deviation adjustment layer when the temperature is higher than the preset range is used to weaken the microcavity effect, thereby effectively improving the color deviation of the display substrate when the temperature is higher than the preset range.

[0058] It should be understood that Figure 4 The color-shifted light emitter 111 shown can also be used in Figure 2 In the illustrated embodiment, no further details will be given here.

[0059] Figure 5 Shown is a schematic cross-sectional view of a partial structure of a color-biased light-emitting device of a display substrate provided by an embodiment of the present application. Figure 5 The color-biased light emitting device 111A shown is Figures 2 to 4 An exemplary structure of the color-casting light-emitting device 111 in the illustrated embodiment.

[0060] like Figure 5 As shown, the color shift adjustment layer 1102 in the color shift light emitting device 111A is formed by mixing a heat-sensitive thickness-changing material 1 into a main film layer 11021 . The heat-sensitive thickness-changing material 1 changes thickness when the temperature is higher than a preset temperature range.

[0061] The color shift adjustment layer 1102 can be formed by co-evaporating the material 1 that changes thickness upon heating and the material of the main film layer 11021. Alternatively, the material 1 that changes thickness upon heating and the material of the main film layer 11021 can be mixed and then evaporated. Other methods are also possible. The main film layer 11021 can be any film layer disposed between the anode and cathode and used for carrier injection, carrier transport, or carrier transport blocking. The main film layer 11021 can be a functional film layer (such as the aforementioned hole injection layer, hole transport layer, electron injection layer, etc.) in the original display substrate before the color shift adjustment layer is applied.

[0062] According to the technical solution provided in the embodiment of the present application, the color deviation adjustment layer in the color deviation light-emitting device is formed by mixing a heated thickness-changing material in the main film layer, so that the heated thickness-changing material is used to make the color deviation adjustment layer change in thickness when the temperature is higher than the preset temperature range, and the heated thickness-changing material is mixed in the main film layer, so that the heated thickness-changing material can be evenly distributed in the main film layer, which is beneficial to the color deviation adjustment layer to uniformly change in thickness when the temperature is higher than the preset temperature range, so that the color deviation light-emitting device can still maintain uniform light output to ensure the display effect of the display substrate.

[0063] In a specific embodiment of the present application, the ratio of the first thickness that can be formed by the heated thickness-changing material 1 to the second thickness that can be formed by the main film layer is in the range of 1 / 99 to 1 / 9, for example, it can be further 1 / 79, 1 / 59, 1 / 39, 1 / 19, etc.

[0064] For example, assuming the color shift adjustment layer 1102 has a thickness of 10 nm, if the ratio of the first thickness of the heated thickness-variable material 1 to the second thickness of the main film layer is 1 / 99, the first thickness of the heated thickness-variable material 1 can be 0.1 nm, and the second thickness of the main film layer can be 9.9 nm. If the ratio of the first thickness of the heated thickness-variable material 1 to the second thickness of the main film layer is 1 / 9, the first thickness of the heated thickness-variable material 1 can be 1 nm, and the second thickness of the main film layer can be 9 nm.

[0065] In the embodiments of the present application, the degree of thickness variation of the color deviation adjustment layer above a preset temperature range is adjusted by adjusting the ratio of the first thickness of the heat-dependent thickness-variable material to the second thickness of the main film layer. This can, on the one hand, prevent the color deviation adjustment layer from changing thickness above the preset temperature range due to a low content of the heat-dependent thickness-variable material in the color deviation adjustment layer when the ratio is too small. On the other hand, it can prevent the color deviation adjustment layer from having an excessively high content of the heat-dependent thickness-variable material in the color deviation adjustment layer when the ratio is too large, which could affect carrier transport or injection.

[0066] In some embodiments of the present application, the material whose thickness changes when heated is a thermal expansion material. When the temperature of the thermal expansion material is higher than a preset temperature range, the thickness of the thermal expansion material increases as the temperature rises.

[0067] The thermal expansion material may be a polychlorotrifluoroethylene resin, polyimide, silicone or silicon dioxide material, or other materials, as long as the thickness increases with increasing temperature above a preset temperature range.

[0068] The average linear expansion coefficient of a thermal expansion material is used to characterize the extent to which the thermal expansion material expands with temperature changes. The average linear expansion coefficient of a thermal expansion material can range from 100×10 -6 / ℃~2000×10 -6 / °C. This can prevent the required content of the thermal expansion material from being too high when the average linear expansion coefficient of the thermal expansion material is too small, thereby affecting the transport or injection of carriers. It can also prevent the thickness of the color deviation adjustment layer from being excessively increased when the average linear expansion coefficient of the thermal expansion material is too large, thereby reducing the display performance of the display substrate.

[0069] In the embodiment of the present application, by setting the material whose thickness changes when heated to a thermal expansion material, the color deviation adjustment layer increases in thickness as the temperature rises above a preset temperature range. Thus, when the temperature is above the preset temperature range, the microcavity effect of the color deviation light-emitting device is weakened by utilizing the thickness change, which is beneficial to improving the color deviation of the original display substrate when the temperature is above the preset temperature range.

[0070] In other embodiments of the present application, the material whose thickness changes when heated is a negative thermal expansion material. When the temperature of the negative thermal expansion material is higher than a preset temperature range, the thickness of the negative thermal expansion material decreases as the temperature increases.

[0071] The negative thermal expansion material can be a metal oxide material (such as tungsten zirconium oxide ZrW2O8 or tungsten hafnium oxide HfW2O8, etc.), a graphene material, an antiperovskite material or a perovskite material, or other materials, as long as the thickness can decrease with increasing temperature above a preset temperature range. The antiperovskite material can be a material with a general structural expression of ABX3, where A can be a metal atom (such as sodium Na, magnesium Mg or aluminum Al, etc.), B can be a non-metallic atom (such as boron B, carbon C or nitrogen N, etc.), and X can be a transition metal element. The antiperovskite material can also be other materials, such as aluminum iron hydride Fe3AlH, etc. The perovskite material can be a material with a general structural expression of CDY3, such as lead titanate PbTiO3 or bismuth nickelate BiNiO3, etc., where C can be a metal cation with a larger radius, D can be a metal cation with a smaller radius, and Y can be an anion.

[0072] In the embodiment of the present application, by setting the material whose thickness changes when heated to a negative thermal expansion material, the thickness of the color deviation adjustment layer decreases as the temperature increases when the temperature is above a preset temperature range. Therefore, when the temperature is above the preset temperature range, the microcavity effect of the color deviation light-emitting device is weakened by utilizing the thickness change, which is beneficial to improving the color deviation of the original display substrate when the temperature is above the preset temperature range.

[0073] In a specific embodiment of the present application, the average linear expansion coefficient of the negative thermal expansion material is in the range of -2000×10 -6 / ℃~-100×10 -6 / ℃.

[0074] The average linear expansion coefficient of a negative thermal expansion material (NTM) is used to characterize how much it shrinks with temperature changes. The average linear expansion coefficient is the ratio of the change in length in a given direction when the temperature changes by 1°C to the length at 20°C (i.e., standard laboratory conditions).

[0075] In the embodiment of the present application, the average linear expansion coefficient of the negative thermal expansion material is in the range of -2000×10-6 / °C to -100×10-6 / °C, thereby avoiding the situation where the average linear expansion coefficient of the negative thermal expansion material is too small and the required content of the negative thermal expansion material is too high, thereby affecting the transport or injection of carriers, etc.; and also avoiding the situation where the thickness of the color deviation adjustment layer is excessively reduced, thereby reducing the display performance of the display substrate, when the average linear expansion coefficient of the negative thermal expansion material is too large.

[0076] Figure 6 As shown, Figure 1 The diagram shows another partial enlarged cross-sectional view taken along line BB' within region A of the display substrate. Figure 6 The embodiment shown is Figure 3 A variation of the illustrated embodiment. Figure 6 The display substrate 100D shown is Figure 5 The color-biased light emitting device 111A in the embodiment shown is applied to Figure 3 An exemplary display substrate of the illustrated embodiment.

[0077] refer to Figure 6 The display substrate 100D, the color deviation adjustment layer 1102 in the color deviation light emitting device 111A is formed by mixing a heat-sensitive thickness-changing material 1 into a main film layer 11021, and the heat-sensitive thickness-changing material 1 changes in thickness when the temperature is higher than a preset temperature range.

[0078] In a specific embodiment of the present application, the main film layer 11021 is at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer.

[0079] For example, if the main film layer 11021 is a hole transport layer, the heat-dependent thickness-changing material 1 can be mixed into the hole transport layer to form the color adjustment layer 1102. It should be understood that the heat-dependent thickness-changing material 1 can be mixed with any one or more of the electron injection layer, electron transport layer, hole blocking layer, electron blocking layer, hole transport layer, and hole injection layer to form the color adjustment layer 1102.

[0080] According to the technical solution provided in the embodiments of the present application, by setting the main film layer as at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer, the main film layer is set as a functional film layer in the original display substrate before the color deviation adjustment layer is added, so that the material whose thickness changes when heated can be mixed with the functional film layer in the original display substrate to form a color deviation adjustment layer, while retaining the performance of the main film layer itself while increasing the performance of reducing the microcavity effect when the temperature is higher than the preset range, and without additionally increasing the thickness of the original display substrate.

[0081] At least one embodiment of the present application further provides a display panel, which includes any of the above embodiments such as a display panel based on Figures 1 to 4 as well as Figure 6 The display substrate in the illustrated embodiment.

[0082] It should be understood that the display substrate in the display panel may also be based on Figures 1 to 4 as well as Figure 6 Any of the display substrates in the illustrated embodiments may be replaced with equivalent or significantly modified display substrates. The display panel may be applied to various electronic display products, including but not limited to at least one of mobile phones, tablet computers, e-book readers, players, digital cameras, laptop computers, car computers, desktop computers, set-top boxes, smart TVs, and wearable devices.

[0083] In addition, according to actual needs, the display panel may also include other structures such as an array substrate for carrying and driving light-emitting devices, an encapsulation layer for encapsulating light-emitting devices, a light extraction layer for guiding or straightening the output light of the light-emitting devices, and other auxiliary optical films such as polarizers.

[0084] Since the display panel of the embodiment of the present application includes the above Figures 1 to 4 as well as Figure 6 All technical solutions of the illustrated embodiment can at least achieve all the above-mentioned technical effects, and will not be described in detail here.

[0085] It should be noted that the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0086] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A display substrate, characterized in that: include: a plurality of light-emitting devices, each of the light-emitting devices comprising an anode, a cathode, and a light-emitting layer located between the anode and the cathode, at least one of the plurality of light-emitting devices being a color-cast light-emitting device; The color-shift light emitting device further includes a color shift adjustment layer located between the anode and the cathode, wherein the thickness of the color shift adjustment layer changes when the temperature is higher than a preset temperature range, and The optical thickness of the color deviation adjustment layer within the preset temperature range is set so that the color deviation light emitting device has a microcavity effect within the preset temperature range, and the optical thickness is the product of the thickness of the color deviation adjustment layer and the refractive index of the color deviation adjustment layer; Among them, within the preset temperature range, the total optical thickness between the anode and the cathode of the color-biased light-emitting device is an integer multiple of 1 / 2 of the center wavelength of the output light of the color-biased light-emitting device. Beyond the preset temperature range, the total optical thickness between the anode and the cathode of the color-biased light-emitting device deviates from an integer multiple of 1 / 2 of the center wavelength of the output light of the color-biased light-emitting device, so as to weaken the microcavity effect.

2. The display substrate according to claim 1, wherein: The color deviation adjustment layer is formed by mixing a material with a thickness change when heated into a main film layer. The thickness of the material with a thickness change when heated changes when the temperature is higher than the preset temperature range.

3. The display substrate according to claim 2, wherein: The ratio of the first thickness of the material that changes thickness when heated to the second thickness of the main film layer is in a range of 1 / 99 to 1 / 9.

4. The display substrate according to claim 2, wherein: The material whose thickness changes when heated is a thermal expansion material. When the temperature of the thermal expansion material is higher than the preset temperature range, the thickness of the thermal expansion material increases as the temperature rises.

5. The display substrate according to claim 2, wherein: The material whose thickness changes when heated is a negative thermal expansion material. When the temperature is higher than the preset temperature range, the thickness of the negative thermal expansion material decreases as the temperature increases.

6. The display substrate according to claim 5, wherein: The average linear expansion coefficient of the negative thermal expansion material is in the range of -2000×10 -6 / ℃~-100×10 -6 / ℃.

7. The display substrate according to claim 2, wherein: The main film layer is at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer.

8. The display substrate according to claim 2, wherein: Each of the light-emitting devices further comprises a hole injection layer, a hole transport layer, an electron transport layer and an electron injection layer stacked in sequence from the anode to the cathode, and The color deviation adjustment layer is disposed between any two adjacent structures among the anode, the hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer, the electron injection layer and the cathode.

9. The display substrate according to claim 8, wherein: Each of the light-emitting devices further includes an electron blocking layer located between the anode and the light-emitting layer and a hole blocking layer located between the cathode and the light-emitting layer, and the color deviation adjustment layer is arranged between any two adjacent structures among the anode, the hole injection layer, the hole transport layer, the electron blocking layer, the light-emitting layer, the hole blocking layer, the electron transport layer, the electron injection layer and the cathode.

10. The display substrate according to claim 1, wherein The plurality of light emitting devices are classified into light emitting devices capable of emitting blue light, light emitting devices capable of emitting red light, and light emitting devices capable of emitting green light, The color-cast light-emitting device is any one of the light-emitting device capable of emitting blue light, the light-emitting device capable of emitting red light, and the light-emitting device capable of emitting green light.

11. A display panel, characterized in that: The display substrate comprises the display substrate according to any one of claims 1 to 10.

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