Display substrate and display panel

Abstract

The present application provides a display substrate and a display panel, wherein the display substrate includes a display function layer and a color deviation adjustment layer. The display function layer includes a plurality of light-emitting devices. The color deviation adjustment layer is located on the display side of the display function layer, and includes at least one color deviation adjustment unit. The color deviation adjustment unit is configured to adjust the chromaticity of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than a preset temperature range, and the first orthographic projection of the color deviation adjustment unit on the plane where the display substrate is located and the second orthographic projection of the light-emitting device corresponding to the color deviation adjustment unit on the plane where the display substrate is located at least partially overlap. A color deviation adjustment layer is provided on the display side of some light-emitting devices of the display substrate, and the chromaticity of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit is adjusted by the color deviation adjustment unit in the color deviation adjustment layer, so as to improve the color deviation phenomenon of the light-emitting device corresponding to the color deviation adjustment unit.

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] Organic Light-Emitting Diode (OLED) is an organic thin film electroluminescent device, which is widely used in electronic display products due to its advantages such as simple preparation process, low cost and flexible display.

[0003] However, due to the limitations of their own materials or structures, the light-emitting devices in current electronic display products are prone to color shift when the temperature is higher than the preset range, which causes the displayed image to be distorted, the contrast to be reduced, and the user experience to be reduced. 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 arranged on the display side of some light-emitting devices of the display substrate, and the chromaticity of the output light of the light-emitting device corresponding to the color deviation adjustment unit is adjusted by the color deviation adjustment unit in the color deviation adjustment layer, so as to solve the problem of color deviation of the light-emitting device when the temperature is higher than a preset range.

[0005] The first aspect of the present application provides a display substrate. The display substrate includes a display function layer and a color deviation adjustment layer. The display function layer includes a plurality of light-emitting devices. The color deviation adjustment layer is located on the display side of the display function layer and includes at least one color deviation adjustment unit. At least one color deviation adjustment unit corresponds one-to-one to at least one of the plurality of light-emitting devices. The color deviation adjustment unit is configured to adjust the chromaticity of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than a preset temperature range, and the first orthographic projection of the color deviation adjustment unit on the plane where the display substrate is located is at least partially overlapped with the second orthographic projection of the light-emitting device corresponding to the color deviation adjustment unit on the plane where the display substrate is located.

[0006] In the above scheme, the carrier balance between the cathode and the anode in the light-emitting device can be maintained, and the chromaticity deviation can be reduced or eliminated when the temperature is higher than the preset temperature range, so as to improve the color deviation phenomenon of the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than the preset temperature range, thereby stabilizing the display performance of the display substrate and improving the user experience.

[0007] In a specific implementation of the first aspect of the present application, the second orthographic projection is located within the first orthographic projection.

[0008] In the above scheme, the color deviation adjustment unit can adjust the chromaticity of the light emitted in any direction by the light-emitting device corresponding to the color deviation adjustment unit, which is conducive to uniformly adjusting the chromaticity of the light emitted in any direction by the light-emitting device corresponding to the color deviation adjustment unit, so that the corresponding light-emitting device can maintain uniform light output.

[0009] In a specific embodiment of the first aspect of the present application, the color deviation adjustment unit is configured to be: colorless and transparent within a preset temperature range; and to have a color and / or transmittance reduced from the corresponding light emitted by the light emitting device when the temperature is higher than the preset temperature range.

[0010] In a specific embodiment of the first aspect of the present application, the material of the color deviation adjustment unit includes a reversible thermochromic material, so that when the temperature is higher than the preset range, the color of the light emitted by the corresponding light-emitting device is changed from colorless to the color of the light emitted by the corresponding light-emitting device when the temperature is higher than the preset range, and the color of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit gradually increases with the increase of temperature; or the material of the color deviation adjustment unit includes a reversible thermochromic transmittance changing material, so that the transmittance is reduced when the temperature is higher than the preset range, and the reversible thermochromic transmittance changing material is when the temperature is higher than the preset range, the transmittance of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit is gradually reduced with the increase of temperature; or the material of the color deviation adjustment unit includes a heated thickness changing material, so that the transmittance is reduced when the temperature is higher than the preset range, and the heated thickness changing material changes in thickness when the temperature is higher than the preset range.

[0011] In a specific embodiment of the first aspect of the present application, the mass proportion of the reversible thermochromic material and the reversible thermotransmittance changing material in the material of the color deviation adjustment unit is 0.1% to 20%.

[0012] In a specific embodiment of the first aspect of the present application, the display substrate further comprises a light extraction layer, which is located on the display side of the display function layer, and at least one color deviation adjustment unit is arranged in the light extraction layer. Furthermore, at least one color deviation adjustment unit is formed by doping the light extraction layer with a reversible thermochromic material, a reversible thermotransmittance changing material, or a heated thickness changing material.

[0013] In the above scheme, the color cast of the display substrate can be improved without increasing the thickness of the light extraction layer and retaining part or all of the functions of the light extraction layer, which is conducive to the thinning of the display substrate.

[0014] In a specific embodiment of the first aspect of the present application, the display substrate further comprises an encapsulation layer, which is located on the display side of the display function layer, and at least one color deviation adjustment unit is disposed in the encapsulation layer. Furthermore, at least one color deviation adjustment unit is formed by doping a reversible thermochromic material and a reversible thermotransmittance changing material in the encapsulation layer.

[0015] In the above solution, the color shift phenomenon of the display substrate can be improved without increasing the thickness of the encapsulation layer and retaining part or all of the functions of the encapsulation layer, which is conducive to the thinning of the display substrate.

[0016] In a specific embodiment of the first aspect of the present application, a plurality of light-emitting devices are divided into a first type of light-emitting devices and a second type of light-emitting devices, the wavelength of the emitted light of the first type of light-emitting devices is smaller than the wavelength of the emitted light of the second type, and the color deviation adjustment unit corresponding to the first type of light-emitting devices is configured to have the color of the emitted light of the first type of light-emitting devices when the temperature is higher than a preset temperature range; or the color deviation adjustment unit corresponding to the second type of light-emitting devices is configured to reduce the transmittance when the temperature is higher than the preset temperature range; or the first type of light-emitting devices and the second type of light-emitting devices are both provided with corresponding color deviation adjustment units, at least one color deviation adjustment unit is divided into a first type of color deviation adjustment unit and a second type of color deviation adjustment unit, the first type of color deviation adjustment unit is configured to correspond to the first type of light-emitting devices, and the first type of color deviation adjustment unit is configured to have the color of the emitted light of the light-emitting devices corresponding to the first type of color deviation adjustment unit when the temperature is higher than the preset temperature range, and the second type of color deviation adjustment unit is configured to correspond to the second type of light-emitting devices, and the second type of color deviation adjustment unit is configured to reduce the transmittance when the temperature is higher than the preset temperature range.

[0017] In a specific embodiment of the first aspect of the present application, the first type of light-emitting device is a light-emitting device that can emit blue light, and the second type of light-emitting device is at least one of a light-emitting device that can emit red light and a light-emitting device that can emit green light.

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

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

[0020] Figure 2 Shown Figure 1 The diagram shown is a partial enlarged cross-sectional schematic diagram of a display substrate cut along BB' in region A.

[0021] Figure 3 Shown Figure 1 Another partially enlarged cross-sectional schematic diagram showing the substrate in region A taken along line BB' is shown.

[0022] Figure 4 Shown Figure 1 The diagram shown is another partial enlarged cross-sectional schematic diagram of the A region of the display substrate taken along line BB'.

[0023] Figure 5 Shown Figure 1 The diagram shown is another partial enlarged cross-sectional schematic diagram of the A region of the display substrate taken along line BB'.

[0024] Figure 6 Shown Figure 1 The diagram shown is another partial enlarged cross-sectional schematic diagram taken along BB' in the A region of the display substrate.

[0025] Figure 7 Shown Figure 1 The diagram shown is another partial enlarged cross-sectional schematic diagram of the A region of the display substrate taken along line BB'.

[0026] Figure 8 Shown is a graph showing the chromaticity changes of different display substrates before and after the light extraction layer is doped with a reversible thermochromic material.

[0027] Fig. 9 Shown is a graph showing the chromaticity changes of different display substrates before and after the reversible thermotransmittance changing material is doped into the light extraction layer. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] At present, the display substrate itself generates heat during the light-emitting process, causing the temperature to rise. When the temperature rises to a value higher than the preset temperature range, 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 chromaticity corresponding to the light-emitting device in the display substrate will shift, which will cause the color displayed by the light-emitting device of the display substrate when the temperature is higher than the preset temperature range to deviate from the color displayed within the preset temperature range, thereby causing the display performance of the display substrate to be unstable, that is, the display image will have a color deviation. It should be noted that the main color of the color deviation can be blue, red, green or yellow, etc. In the following, the display substrate before the improvement using the technical solution of the present application is collectively referred to as the original display substrate.

[0030] In one current method, the color shift phenomenon is improved by doping the light-emitting layer of the light-emitting device with a material whose fluorescence intensity decreases as the temperature increases, such as a thermotropic phase change material. However, this method changes the original material composition of the light-emitting layer, and thus easily changes the electrical balance of the light-emitting device.

[0031] In view of this, at least one embodiment of the present application provides a display substrate and a display panel, which can at least solve the above problems. The present application sets a color deviation adjustment layer on the display side of some light-emitting devices of the original display substrate. The setting of the color deviation adjustment layer will not change the original material composition and structure of any film layer such as the light-emitting layer in the light-emitting device, that is, the type and stacking relationship of the film layer in the original light-emitting device will not be affected, nor will it affect the electrical balance of the light-emitting device, thereby avoiding the risk of problems such as changes in the driving voltage and unstable luminous efficiency caused by changes in the structure of the light-emitting device, and is also conducive to saving design costs. In addition, by using the color deviation adjustment unit in the color deviation adjustment layer to adjust the chromaticity of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than the preset temperature range, thereby reducing or eliminating the chromaticity deviation, and thus improving the color deviation phenomenon of the light-emitting device corresponding to the color deviation adjustment unit, thereby stabilizing the display performance of the display substrate and improving the user experience effect.

[0032] Below, the display substrate and display panel according to at least one embodiment of the present application are described in conjunction with the accompanying drawings. In addition, in these drawings, a spatial rectangular coordinate system is established with reference to the substrate of the display substrate to assist in explaining the positional relationship of each structure in the display substrate. In the spatial rectangular coordinate system, the X-axis and the Y-axis are parallel to the plane where the display substrate is located, and the Z-axis is perpendicular to the plane where the display substrate is located. In addition, in the embodiments of the present application, "length" is defined in the direction parallel to the X-axis, for example, the difference in the straight-line distance between the two farthest endpoints of the object in the direction parallel to the X-axis is the length of the object; "width" is defined in the direction parallel to the Y-axis, for example, the difference in the straight-line distance between the two farthest endpoints of the object in the direction parallel to the Y-axis is the width of the object; and "thickness" is defined with reference to the substrate, for example, for an object located on one side of the substrate, the difference between the vertical distance from the end of the object farthest from the substrate to the substrate and the vertical distance from the end closest to the substrate to the substrate is the thickness of the object.

[0033] like Figures 1 to 7 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 a signal line 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.

[0034] In the display substrate provided in at least one embodiment of the present application, the display substrate 100 includes a display function layer 110 and a color deviation adjustment layer 120. The display function layer 110 includes a plurality of light-emitting devices 111. The color deviation adjustment layer 120 is located on the display side of the display function layer 110, and includes at least one color deviation adjustment unit 121, and at least one color deviation adjustment unit 121 corresponds one-to-one to at least one of the plurality of light-emitting devices 111. The color deviation adjustment unit 121 is configured to adjust the chromaticity of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than a preset temperature range. The first orthographic projection of the color deviation adjustment unit 121 on the plane where the display substrate is located is at least partially overlapped with the second orthographic projection of the light-emitting device corresponding to the color deviation adjustment unit 121 on the plane where the display substrate is located. In this way, the carrier balance between the cathode and the anode in the light-emitting device will not be changed, that is, the electrical properties of the light-emitting device, such as carrier transport, will not be affected, and the chromaticity deviation can be reduced or eliminated when the temperature is higher than the preset temperature range, so as to improve the color deviation phenomenon of the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than the preset range, thereby stabilizing the display performance of the display substrate and improving the user experience.

[0035] It should be noted that each of the multiple light-emitting devices 111 may include an anode, a cathode and a light-emitting layer located between the anode and the cathode. Further, each light-emitting device may also include 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. Further, each light-emitting device may also include 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.

[0036] The display substrate may further include a substrate 130. The substrate 130 is used to support a plurality of light-emitting devices 111. For example, the substrate 130 may be an array substrate. The display function layer 110 may further include a pixel defining layer 112. The pixel defining layer 112 may be disposed between two adjacent light-emitting devices among the plurality of light-emitting devices 111. The plurality of light-emitting devices 111 may share the same cathode layer, or the cathode between any two adjacent light-emitting devices may be separated by a pixel defining layer. The structure of the display substrate of at least one embodiment of the present application is described by taking the cathode between any two adjacent light-emitting devices being separated by a pixel defining layer as an example.

[0037] The light emission mode of the display substrate 100 can be bottom emission or top emission. For example, in some embodiments of the present application, for example, Figure 2As shown, the light emission mode of the display substrate 100 is bottom emission, that is, the light emission direction of the display substrate is along the negative direction of the Z axis, the substrate 130 can be a transparent substrate formed by transparent glass or transparent plastic, etc., and the color deviation adjustment layer 120 can be located between the display function layer 110 and the substrate 130. For example, in some other embodiments of the present application, for example, specifically as Figures 3 to 7 As shown, the light emission mode of the display substrate 100 is top emission, the substrate 130 can be a transparent substrate or an opaque substrate formed of metal, etc., and the color deviation adjustment layer 120 can be located on the side of the display function layer 110 away from the substrate 130.

[0038] The preset temperature range can be determined according to the temperature at which at least one light-emitting device produces color cast. For example, a colorimeter such as a spectrometer can be used to measure the chromaticity of at least one light-emitting device, thereby obtaining a chromaticity change graph, and the preset temperature range is further determined according to the chromaticity change graph. The preset temperature range can also be determined by the user according to personal observations or the model of the display substrate, for example, the preset temperature range can be set to 10°C to 20°C or 15°C to 25°C, etc.

[0039] In the display substrate provided in the embodiments of the present application, as long as the first orthographic projection and the second orthographic projection at least partially overlap, the color shift phenomenon can be improved. On this basis, the relationship between the first orthographic projection and the second orthographic projection can be set according to the needs of the actual process and is not limited here. In the following, in several embodiments, the relationship between the first orthographic projection and the second orthographic projection is described.

[0040] For example, in some embodiments of the present application, for example, Figure 2 As shown, the first orthographic projection may be located within the second orthographic projection. Taking length as an example, the length of the color deviation adjustment unit 121 may be less than the length of the light-emitting device corresponding to the color deviation adjustment unit 121. The relationship between the width of the color deviation adjustment unit 121 and the width of the light-emitting device corresponding to the color deviation adjustment unit 121 is similar to the relationship between the length and will not be repeated here.

[0041] For example, in some other embodiments of the present application, for example, Figures 3 to 7 As shown, the second orthographic projection can be located within the first orthographic projection. Taking length as an example, the length of the color deviation adjustment unit 121 can be greater than or equal to the length of the light-emitting device corresponding to the color deviation adjustment unit 121. In this way, it can be ensured that the second orthographic projection is completely covered by the first orthographic projection, and thus, the color deviation adjustment unit 121 can adjust the chromaticity of the light emitted from any direction of the light-emitting device corresponding to the color deviation adjustment unit 121, which is conducive to the chromaticity of the light emitted from any direction of the light-emitting device corresponding to the color deviation adjustment unit 121 being uniformly adjusted, so that the corresponding light-emitting device can still maintain uniform light emission, so as to ensure the display effect of the display substrate.

[0042] In the display substrate provided in at least one embodiment of the present application, the color deviation adjustment unit 121 is configured to be colorless and transparent within a preset temperature range, and to have a color and / or transmittance reduction corresponding to the light emitted by the corresponding light-emitting device when the temperature is higher than the preset temperature range. In this way, it can be ensured that the chromaticity of the light emitted by the corresponding light-emitting device within the preset temperature range is not affected, that is, the color performance of the display substrate within the preset temperature range is not affected. In addition, when the temperature is higher than the preset range, the chromaticity of the light emitted by the corresponding light-emitting device is adjusted by emitting the color of the light emitted by the corresponding light-emitting device, and / or the chromaticity of the light emitted by the corresponding light-emitting device is adjusted by reducing the transmittance of the light emitted by the corresponding light-emitting device, thereby adjusting the chromaticity of the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than the preset range, so as to avoid color deviation of the display substrate.

[0043] In the display substrate provided in the embodiments of the present application, the multiple light-emitting devices 111 can all be light-emitting devices that emit light of the same color, or can be light-emitting devices that emit light of different colors. The types of the multiple light-emitting devices can be set according to the needs of the actual process and are not limited here. In the following, in several embodiments, the types of the multiple light-emitting devices and the design methods of the corresponding color deviation adjustment units are described.

[0044] For example, in some embodiments of the present application, if the plurality of light emitting devices 111 are light emitting devices that emit light of the same color, the main color of the color cast is the same or substantially the same as the color of the light that can be emitted by the light emitting device. The plurality of light emitting devices 111 can be any one of a light emitting device that can emit blue light, a light emitting device that can emit red light, a light emitting device that can emit green light, and a light emitting device that can emit yellow light. For example, specifically as Figure 2 As shown, a color shift adjustment unit 121 may be provided on the display side of each light emitting device 111. In this way, the chromaticity of the light emitted by each light emitting device may be adjusted when the temperature is higher than a preset temperature range to improve the color shift phenomenon of each light emitting device.

[0045] For example, in other embodiments of the present application, if the multiple light-emitting devices 111 can be light-emitting devices of different categories (such as light-emitting devices that emit light of different colors), the main color of the color cast is related to the proportion and arrangement of light-emitting devices of different categories. The multiple light-emitting devices 111 can be any combination of light-emitting devices that can emit blue light, light-emitting devices that can emit red light, light-emitting devices that can emit green light, and light-emitting devices that can emit yellow light. In this case, a color cast adjustment unit can be specifically set on the display side of a single category of light-emitting devices (such as light-emitting devices that emit the same color light), or different categories of color cast adjustment units can be set on the display sides of light-emitting devices of different categories. The categories of the multiple light-emitting devices 111 can be classified according to the color of the emitted light, or according to the size of the wavelength of the emitted light, or can be classified in other ways. Exemplarily, specifically as Figures 3 to 6 As shown, the plurality of light emitting devices 111 can be divided into a first type of light emitting device 1111 and a second type of light emitting device 1112 , and the wavelength of the emitted light of the first type of light emitting device 1111 is smaller than the wavelength of the emitted light of the second type of light emitting device 1112 .

[0046] It should be noted that different types of light-emitting devices have different degrees of chromaticity shift as the temperature rises when the temperature is higher than the preset temperature range, which may cause color shift in the original display substrate. Taking the first type of light-emitting devices and the second type of light-emitting devices as an example, the smaller the wavelength of the emitted light, the greater the degree of chromaticity shift as the temperature rises when the temperature is higher than the preset temperature range.

[0047] In the display substrate provided in at least one embodiment of the present application, a color deviation adjustment unit may be provided only for the display side of the first type of light emitting device. Figure 3 As shown, the color deviation adjustment unit 121 corresponding to the first type of light emitting device 1111 is configured so that when the temperature is higher than the preset temperature range, the color deviation adjustment unit has the color of the light emitted by the corresponding light emitting device. In this way, when the temperature is higher than the preset temperature range, the color of the light emitted by the corresponding color deviation adjustment unit is superimposed on the chromaticity of the light emitted by the first type of light emitting device, thereby reducing or eliminating the degree of deviation of the chromaticity of the light emitted by the first type of light emitting device, improving the color deviation phenomenon of the original display substrate, and improving the display effect of the display substrate without reducing the transmittance of the light emitting device corresponding to the color deviation adjustment unit.

[0048] In the display substrate provided in at least one embodiment of the present application, a color deviation adjustment unit may be provided only for the display side of the second type of light emitting device. Figure 4As shown, the color deviation adjustment unit 121 corresponding to the second type of light emitting device 1112 is configured to reduce the transmittance when the temperature is higher than the preset temperature range. In this way, when the temperature is higher than the preset temperature range, the transmittance of the light emitted by the second type of light emitting device is reduced, thereby increasing the degree of chromaticity deviation of the second type of light emitting device, that is, reducing or eliminating the difference in the degree of chromaticity deviation between the second type of light emitting device and the first type of light emitting device, thereby improving the color deviation phenomenon of the original display substrate.

[0049] In the display substrate provided in at least one embodiment of the present application, a color deviation adjustment unit may be provided on both the display side of the first type of light emitting device and the display side of the second type of light emitting device. Figure 5 As shown, the first type of light-emitting device 1111 and the second type of light-emitting device 1112 are both provided with corresponding color deviation adjustment units, at least one color deviation adjustment unit 121 is divided into a first type of color deviation adjustment unit 1211 and a second type of color deviation adjustment unit 1212, the first type of color deviation adjustment unit 1211 is provided corresponding to the first type of light-emitting device 1111, and the first type of color deviation adjustment unit 1211 is provided to have the color of the light emitted by the light-emitting device corresponding to the first type of color deviation adjustment unit when the temperature is higher than the preset range, the second type of color deviation adjustment unit 1212 is provided corresponding to the second type of light-emitting device 1112, and the second type of color deviation adjustment unit 1212 is provided to reduce the transmittance when the temperature is higher than the preset range. In this way, by superimposing the color of the output light of the first type of color deviation adjustment unit on the chromaticity of the output light of the first type of light emitting device when the temperature is higher than the preset range, the degree of chromaticity deviation of the output light of the first type of light emitting device is reduced, and at the same time, by reducing the transmittance of the output light of the second type of light emitting device when the temperature is higher than the preset range, the degree of chromaticity deviation of the second type of light emitting device is increased, thereby reducing or eliminating the difference in the degree of chromaticity deviation between the second type of light emitting device and the first type of light emitting device when the degree of chromaticity deviation of the first type of light emitting device and the degree of chromaticity deviation of the second type of light emitting device are improved less, so as to improve the color deviation phenomenon of the original display substrate, and at the same time avoid the adverse effects such as excessive thickness of the display substrate caused by excessive thickness of the corresponding color deviation adjustment layer when the degree of chromaticity deviation of the first type of light emitting device or the degree of chromaticity deviation of the second type of light emitting device needs to be improved too much.

[0050] In the display substrate provided in at least one embodiment of the present application, the first type of light emitting device 1111 is a light emitting device that can emit blue light, and the second type of light emitting device 1112 is at least one of a light emitting device that can emit red light and a light emitting device that can emit green light.

[0051] It should be noted that when the second type of light emitting device 1112 is a light emitting device 11121 capable of emitting red light and a light emitting device 11122 capable of emitting green light, if the color cast difference between the light emitting device capable of emitting red light and the light emitting device capable of emitting green light is not large, the same color cast adjustment unit 1212 may be provided correspondingly to the light emitting device capable of emitting red light and the light emitting device capable of emitting green light. For example, Figure 6 If the color cast difference between the light emitting device 11121 capable of emitting red light and the light emitting device 11122 capable of emitting green light is large, different color cast adjustment units may be provided on the light emitting device 11121 capable of emitting red light and the light emitting device 11122 capable of emitting green light. Figure 7 As shown, the second type of color deviation adjustment unit 1212 can be divided into a color deviation adjustment unit 12121 corresponding to a light emitting device that can emit red light and a color deviation adjustment unit 12122 corresponding to a light emitting device that can emit green light. In some embodiments, different color deviation adjustment units can be realized by adjusting the thickness of the color deviation adjustment unit or the mass proportion of materials such as reversible thermal transmittance changing materials, which is conducive to targetedly adjusting the chromaticity of the emitted red light and the chromaticity of the emitted green light to improve the display effect of the display substrate.

[0052] In the display substrate provided in the embodiments of the present application, as long as the color deviation adjustment unit can adjust the chromaticity of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit, the color deviation phenomenon can be improved. On this basis, the material of the color deviation adjustment unit can be selected according to the needs of the actual process and is not limited here. In the following, the material of the color deviation adjustment unit is described in several embodiments.

[0053] For example, in some embodiments of the present application, the material of the color deviation adjustment unit includes a reversible thermochromic material, so that it has the color of the light emitted by the corresponding light-emitting device when the temperature is higher than the preset range. The reversible thermochromic material changes from colorless to the color of the light emitted by the corresponding light-emitting device when the temperature is higher than the preset range, and gradually increases the color of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit as the temperature rises. In this way, it can be ensured that the chromaticity of the light emitted by the corresponding light-emitting device within the preset temperature range is not affected, and the color deviation of the corresponding light-emitting device can be reduced or eliminated by increasing the color of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than the preset range, so as to improve the color deviation phenomenon of the display substrate, and the display effect of the display substrate can be improved without reducing the transmittance of the light-emitting device corresponding to the color deviation adjustment unit.

[0054] It should be noted that the changes of the reversible thermochromic material within a preset temperature range and above the preset temperature range are reversible. Specifically, above the preset temperature range, the reversible thermochromic material changes from colorless to the color of the light emitted by the corresponding light-emitting device, and the color of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit gradually increases with the increase of temperature. If the temperature drops to within the preset temperature range, the reversible thermochromic material returns to colorless from the color of the light emitted by the corresponding light-emitting device.

[0055] It should also be noted that the reversible thermochromic materials in the color deviation adjustment unit corresponding to the light emitting devices emitting light of different colors will be different, and the reversible thermochromic materials can be selected according to actual needs. The reversible thermochromic material can be any material that satisfies the conditions that the color of the light emitted by the corresponding light emitting device changes from colorless to the color of the light emitted by the corresponding light emitting device under a preset temperature range, and the color deviation adjustment unit gradually increases with the increase of temperature. On this basis, the present application does not limit the specific composition of the reversible thermochromic material. For example, the reversible thermochromic material can be a zinc complex of a Schiff base of a disalicyclic aldehyde-condensed aromatic amine such as disalicyclic aldehyde-condensed p-phenylenediamine zinc complex, or a material formed by introducing red, green and blue luminescent groups on a poly (N-isopropylacrylamide) derivative for realizing reversible thermochromic adjustment of red, green and blue. For example, the red luminescent group may be 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM), the green luminescent group may be a coumarin derivative, and the blue luminescent group may be a pyrene derivative.

[0056] In the display substrate provided in at least one embodiment of the present application, the mass proportion of the reversible thermochromic material in the material of the color deviation adjustment unit is 0.1% to 20%, for example, it can be further 0.5%, 0.8%, 2%, 9% or 15%, etc. In this way, the increase in the light color of the color deviation adjustment unit under the condition of being higher than the preset temperature range is adjusted by adjusting the mass proportion of the reversible thermochromic material in the material of the color deviation adjustment unit, so as to avoid that when the mass proportion is too small, the increase in the light color is too small due to the low content of the reversible thermochromic material in the color deviation adjustment unit, so that the color deviation phenomenon of the original display substrate is not significantly improved. On the other hand, it can avoid that when the mass proportion is too large, the increase in the light color is too large due to the high content of the reversible thermochromic material in the color deviation adjustment unit, so that the main color of the color deviation of the original display substrate is changed to the color of the light color of the reversible thermochromic material.

[0057] For example, in some other embodiments of the present application, the material of the color deviation adjustment unit includes a reversible thermotransmittance changing material, so that the transmittance is reduced when the temperature is higher than the preset temperature range. The reversible thermotransmittance changing material is a material that gradually reduces the transmittance of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit as the temperature increases when the temperature is higher than the preset temperature range. In this way, it can be ensured that the transmittance of the light emitted by the corresponding light-emitting device within the preset temperature range is not affected, and the color deviation of the corresponding light-emitting device can be increased by reducing the transmittance of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than the preset temperature range, thereby reducing or eliminating the difference in the degree of chromaticity deviation between different types of light-emitting devices, thereby improving the color deviation phenomenon of the display substrate.

[0058] It should be noted that the changes of the reversible thermochromic material within a preset temperature range and above the preset temperature range are reversible. Specifically, the reversible thermochromic material can gradually reduce the transmittance of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit as the temperature rises above the preset temperature range. If the temperature drops to within the preset temperature range, the transmittance of the reversible thermochromic material is restored to the value within the preset temperature range. For example, the reversible thermochromic material can be a material including gelatin and sodium chloride, a material including gelatin and calcium dichloride, or a material including gelatin and magnesium dichloride. Furthermore, the reversible thermochromic material can also include solvents and coagulants. For another example, the reversible thermochromic material can be a material formed by combining polystyrene, oxidized polypropylene, polyvinyl alcohol, hydroxyethyl cellulose, hydroxypropyl cellulose, etc. with inorganic salts in appropriate proportions.

[0059] In the display substrate provided in at least one embodiment of the present application, the mass proportion of the reversible thermotransmittance changing material in the material of the color deviation adjustment unit is 0.1% to 20%, for example, it can be further 0.5%, 0.8%, 2%, 9% or 15%, etc. In this way, the degree of reduction in the transmittance of the color deviation adjustment unit above the preset temperature range is adjusted by adjusting the mass proportion of the reversible thermotransmittance changing material in the material of the color deviation adjustment unit, so as to avoid, on the one hand, the color deviation phenomenon of the original display substrate being not significantly improved due to the too small degree of reduction in transmittance when the mass proportion is too small due to the too low content of the reversible thermotransmittance changing material in the color deviation adjustment unit. On the other hand, it can avoid, when the mass proportion is too large, the degree of reduction in transmittance is too large due to the too high content of the reversible thermotransmittance changing material in the color deviation adjustment unit, thereby reducing the display effect of the display substrate.

[0060] For example, in some other embodiments of the present application, the material of the color deviation adjustment unit includes a material whose thickness changes when heated, so that the transmittance decreases when the temperature is higher than the preset temperature range, and the material whose thickness changes when heated changes when the temperature is higher than the preset temperature range. In this way, it can be ensured that the transmittance of the light emitted by the corresponding light-emitting device within the preset temperature range and the overall thickness of the display substrate are not affected, and the color deviation of the corresponding light-emitting device can be reduced or eliminated by reducing the transmittance of the light emitted by the color deviation adjustment unit when the temperature is higher than the preset temperature range, thereby improving the color deviation phenomenon of the display substrate.

[0061] It should be noted that the material that changes thickness when heated can be a material with a positive or negative average linear expansion coefficient. If the material that changes thickness when heated is a material with a positive average linear expansion coefficient, the thickness of the material that changes thickness when heated increases with the temperature when the temperature is higher than the preset temperature range. For example, it can be a material such as polytrifluorochloroethylene resin, polyimide, silicone or silicon dioxide material. If the material that changes thickness when heated is a material with a negative average linear expansion coefficient, the thickness of the material that changes thickness when heated decreases with the temperature when the temperature is higher than the preset temperature range. For example, it 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.

[0062] In some embodiments, the color deviation adjustment unit can be a single film layer formed by materials in the above embodiments such as reversible thermochromic materials, reversible thermotransmittance changing materials or heated thickness changing materials. The single film layer can be a new film layer added on the basis of the functional film layer in the original display substrate. For example, it can be formed by vacuum evaporation. In this way, the material of the functional film layer in the original display substrate does not need to be changed, which is conducive to saving design costs. For example, the thickness of the color deviation adjustment unit can range from 5 to 100nm, and further for example, 10nm, 20nm, 35nm, 55nm or 80nm, etc. The thickness of the color deviation adjustment unit can be adjusted according to the degree of color deviation of the light-emitting device.

[0063] In other embodiments, the color deviation adjustment unit may also be a film layer in which the material in the above-mentioned embodiment is doped into any one or more functional film layers such as a light extraction layer and an encapsulation layer on the display side of the display functional layer in a doping manner. In this way, the color deviation phenomenon of the display substrate can be improved without increasing the thickness of the original functional film layer and retaining part or all of the functions of the original functional film layer, which is conducive to the thinning of the display substrate. The doping method may be to co-evaporate the material of the functional film layer and the material in the above-mentioned embodiment, or to first mix the material of the functional film layer and the material in the above-mentioned embodiment and then evaporate them. For example, the thickness range of the color deviation adjustment unit may be 5 to 50 nm, and further for example 10 nm, 15 nm, 35 nm or 48 nm, etc. The thickness of the color deviation adjustment unit may be adjusted according to the degree of color deviation of the light-emitting device.

[0064] The color deviation adjustment layer formed by doping is described below through several specific embodiments.

[0065] In the display substrate provided in at least one embodiment of the present application, the display substrate further includes a light extraction layer located on the display side of the display function layer, and at least one color deviation adjustment unit is disposed in the light extraction layer. Figures 2 to 7 As shown, the color deviation adjustment layer 120 may be a light extraction layer provided with at least one color deviation adjustment unit.

[0066] It should be noted that, in the direction along the Z-axis, the closer the distance to the light-emitting device corresponding to at least one color deviation adjustment unit is, the less light is enclosed by the high refractive index film layer or substrate, etc. Therefore, the closer the functional film layer provided with at least one color deviation adjustment unit is to the light-emitting device corresponding to at least one color deviation adjustment unit, the more conducive it is to adjusting the chromaticity of the output light of the light-emitting device corresponding to the color deviation adjustment unit when the temperature is higher than the preset range.

[0067] In an embodiment of the present application, relative to other functional film layers of the original display substrate, the light extraction layer is closer to the light-emitting device corresponding to at least one color deviation adjustment unit, and at least one color deviation adjustment unit is arranged in the light extraction layer, which is beneficial to adjusting the chromaticity of the output light of the light-emitting device corresponding to the color deviation adjustment unit.

[0068] In the display substrate provided in at least one embodiment of the present application, at least one color deviation adjustment unit is formed by doping a reversible thermochromic material, a reversible thermotransmittance changing material, or a heated thickness changing material in the light extraction layer.

[0069] It should be noted that the closer the functional film layer is to the light-emitting device corresponding to at least one color deviation adjustment unit, the less material doped in the functional film layer is required to achieve the same degree of chromaticity change when the temperature is higher than the preset temperature range.

[0070] In the embodiments of the present application, by doping the light extraction layer with doping materials such as reversible thermochromic materials, reversible thermotransmittance changing materials or heat thickness changing materials, it is beneficial to retain most or even all of the performance of the light extraction layer, such as increased transmittance, while achieving adjustment of the chromaticity of the output light of the light-emitting device corresponding to the color deviation adjustment unit above a preset temperature range while doping with less doping materials.

[0071] It should also be noted that in the field of display technology, in order to enable the light extraction layer to fully play its role such as extracting or straightening the emitted light of the light emitting device, the thickness of the light extraction layer is usually set to the thickness corresponding to the highest light extraction efficiency. If the thickness of the light extraction layer changes, the transmittance will decrease, thereby reducing or eliminating the chromaticity deviation of the corresponding light emitting device.

[0072] For example, the ratio of the first thickness that can be formed by the heated thickness-changing material to the second thickness that can be formed by the light extraction layer is in the range of 1 / 99 to 1 / 9, and can be further 1 / 79, 1 / 59, 1 / 39, 1 / 19, etc. In this way, the thickness change degree of the color deviation adjustment unit when the temperature is higher than the preset temperature range is adjusted by adjusting the ratio of the first thickness that can be formed by the heated thickness-changing material to the second thickness that can be formed by the light extraction layer, and then the degree of reduction in transmittance when the temperature is higher than the preset temperature range is adjusted. This can avoid, on the one hand, the insignificant improvement of the color deviation phenomenon of the original display substrate due to the too small reduction in transmittance when the content of the heated thickness-changing material in the color deviation adjustment unit is too low when the ratio is too small, and on the other hand, it can avoid, when the mass ratio is too large, the reduction in transmittance is too large when the content of the heated thickness-changing material in the color deviation adjustment unit is too high, and the display effect of the display substrate is reduced.

[0073] Below, through several specific embodiments, the effect of the chromaticity contrast between the original display substrate and the display substrate is explained. The following chromaticity measurement is measured using a spectrometer CS2000, and the driving voltage is set to 4V. The horizontal axis in the chromaticity coordinates is CIEx, which represents the red component, and the vertical axis is CIEy, which represents the green component. The mass proportion of the reversible thermochromic material of the original display substrate is 0%, and the thickness of the color deviation adjustment unit is 0nm. In the preset temperature range such as 10°C to 25°C, the chromaticity coordinates of the original display substrate are (0.300, 0.310), that is, the chromaticity coordinates marked as 1. In the case of a temperature range higher than the preset temperature range, such as 50°C, the chromaticity coordinates of the original display substrate are (0.332, 0.342), that is, the chromaticity coordinates marked as 2. In the case of different original display substrates, the chromaticity coordinates at different temperatures will also be different. This application does not specifically limit the chromaticity coordinates of the original display substrate at 25°C and 50°C.

[0074] For example, the structure of the substrate is shown in Table 1. Figure 3 The embodiment shown is taken as an example. Further, Figure 3 The color deviation adjustment unit 121 of the embodiment shown is formed by doping a reversible thermochromic material in the light extraction layer, and the first type of light emitting device 1111 is a light emitting device that can emit blue light. The reversible thermochromic material is a material in which 7-(diethylamino)-2-oxo-2-hydrogen-chromene-3-carboxylic acid ethyl ester is doped with dodecanoic acid at a mass ratio of 2% as an example.

[0075] Table 1 Chromaticity changes of different display substrates before and after doping the reversible thermochromic material in the light extraction layer

[0076]

[0077] Combination Figure 8 By comparing the chromaticity coordinates marked as 3 and 4 with the chromaticity coordinates of the original display substrate, it can be seen that when the thickness of the color shift adjustment unit is consistent, at least in the range of mass percentage not greater than 2%, the higher the doping mass percentage, the closer the chromaticity coordinates of the display substrate at 50°C are to the chromaticity coordinates of the original display substrate at 25°C (that is, the chromaticity coordinates marked as 1), that is, the smaller the degree of chromaticity shift relative to the chromaticity coordinates of the original display substrate at 50°C (that is, the chromaticity coordinates marked as 2), and thus the more conducive to improving the color shift phenomenon of the original display substrate. In addition, by comparing the chromaticity coordinates marked as 4 and 5 with the chromaticity coordinates of the original display substrate, it can be seen that when the mass percentage is both 2%, at least in the range of thickness not greater than 10nm, the higher the thickness, the closer the chromaticity coordinates of the display substrate at 50°C are to the chromaticity coordinates of the original display substrate at 25°C, that is, the smaller the degree of chromaticity shift relative to the chromaticity coordinates of the original display substrate at 50°C, and thus the more conducive to improving the color shift phenomenon of the original display substrate. This proves that doping with reversible thermochromic materials can improve the color shift of the display substrate, and the degree of chromaticity shift can be adjusted by adjusting the thickness of the color shift adjustment unit or the mass ratio of the reversible thermochromic material.

[0078] For example, as shown in Table 2 below, the reversible thermal transmittance changing material is exemplified by a material including 5% gelatin and 5% magnesium dichloride.

[0079] Table 2 Chromaticity changes of different display substrates before and after doping the reversible thermal transmittance changing material in the light extraction layer

[0080]

[0081] Combination Fig. 9It can be seen that by comparing the chromaticity coordinates marked as 6, 7 and 8 with the chromaticity coordinates of the original display substrate, it can be seen that when the mass proportion is 9%, at least in the range of thickness not greater than 20nm, the higher the thickness, the closer the chromaticity coordinates of the display substrate at 50°C are to the chromaticity coordinates of the original display substrate at 25°C, that is, the smaller the degree of chromaticity deviation relative to the chromaticity coordinates of the original display substrate at 50°C, and thus the more conducive to improving the color deviation of the original display substrate. It can be proved that the doping of reversible thermal transmittance changing materials can improve the color deviation of the display substrate, and the degree of chromaticity deviation can be adjusted by adjusting the thickness of the color deviation adjustment unit.

[0082] In the display substrate provided in at least one embodiment of the present application, the display substrate further includes: an encapsulation layer located on the display side of the display function layer, at least one color deviation adjustment unit 121 is arranged in the encapsulation layer, and at least one color deviation adjustment unit 121 is formed by doping a reversible thermochromic material or a reversible thermotransmittance changing material in the encapsulation layer. Figures 2 to 7 As shown, the color deviation adjustment layer 120 may be an encapsulation layer provided with at least one color deviation adjustment unit. The encapsulation layer is a film layer used to encapsulate the light-emitting device. In this way, by doping the encapsulation layer with a reversible thermochromic material or a reversible thermochromic transmittance change and other doping materials, it is beneficial to retain most or even all of the properties of the encapsulation layer, such as water and oxygen isolation, while achieving the adjustment of the chromaticity of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit under a temperature range higher than a preset temperature range.

[0083] At least one embodiment of the present application further provides a display panel, which includes any of the above embodiments such as based on Figures 1 to 7 The display substrate in the illustrated embodiment.

[0084] It should be understood that the display substrate in the display panel may also be based on Figures 1 to 7 Any display substrate in the illustrated embodiments is equivalent to a display substrate replaced or significantly modified. The display panel can 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.

[0085] In addition, according to actual needs, the display panel may also include other structures such as polarizers.

[0086] Since the display panel of the embodiment of the present application includes the above Figures 1 to 7 All technical solutions of the illustrated embodiment can at least achieve all the above-mentioned technical effects, and will not be repeated here.

[0087] 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.

[0088] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A display substrate, characterized in that: include: The display function layer includes a plurality of light-emitting devices, wherein the plurality of light-emitting devices are divided into a first type of light-emitting devices and a second type of light-emitting devices, and the wavelength of the emitted light of the first type of light-emitting devices is smaller than the wavelength of the emitted light of the second type of light-emitting devices; a color deviation adjustment layer, located on the display side of the display function layer, comprising at least one color deviation adjustment unit, wherein the at least one color deviation adjustment unit corresponds one-to-one to at least one light-emitting device among the plurality of light-emitting devices, and a first orthographic projection of the color deviation adjustment unit on the plane where the display substrate is located and a second orthographic projection of the light-emitting device corresponding to the color deviation adjustment unit on the plane where the display substrate is located at least partially overlap; Wherein, the color deviation adjustment unit corresponding to the first type of light emitting device is configured to have the color of the light emitted by the first type of light emitting device when the temperature is higher than a preset temperature range; or The color deviation adjustment unit corresponding to the second type of light emitting device is configured to reduce the light transmittance when the temperature is higher than a preset temperature range; or The first type of light-emitting devices and the second type of light-emitting devices are both provided with corresponding color deviation adjustment units, and the at least one color deviation adjustment unit is divided into a first type of color deviation adjustment unit and a second type of color deviation adjustment unit. The first type of color deviation adjustment unit is provided in correspondence with the first type of light-emitting devices, and the first type of color deviation adjustment unit is provided to have the color of the light emitted by the light-emitting devices corresponding to the first type of color deviation adjustment unit when the temperature is higher than a preset temperature range, and the second type of color deviation adjustment unit is provided in correspondence with the second type of light-emitting devices, and the second type of color deviation adjustment unit is provided to reduce the transmittance when the temperature is higher than the preset temperature range.

2. The display substrate according to claim 1, characterized in that: The second orthographic projection is located within the first orthographic projection.

3. The display substrate according to claim 1, characterized in that: The material of the color deviation adjustment unit includes a reversible thermochromic material, so that when the temperature is higher than a preset range, the color of the light emitted by the corresponding light-emitting device is changed from colorless to the color of the light emitted by the corresponding light-emitting device when the temperature is higher than the preset range, and the color of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit is gradually increased as the temperature increases; or The material of the color deviation adjustment unit includes a reversible thermotransmittance-changing material, so that the transmittance is reduced when the temperature is higher than a preset temperature range, and the reversible thermotransmittance-changing material gradually reduces the transmittance of the light emitted by the light-emitting device corresponding to the color deviation adjustment unit as the temperature increases when the temperature is higher than the preset temperature range; or The material of the color deviation adjustment unit includes a material whose thickness changes when heated, so that the light transmittance is reduced when the temperature is higher than a preset temperature range, and the material whose thickness changes when heated when the temperature is higher than the preset temperature range.

4. The display substrate according to claim 3, characterized in that: The mass proportion of the reversible thermochromic material or the reversible thermotransmittance changing material in the material of the color deviation adjustment unit is 0.1% to 20%.

5. The display substrate according to claim 3, characterized in that: Also includes: The light extraction layer is located on the display side of the display function layer, and the at least one color deviation adjustment unit is arranged in the light extraction layer.

6. The display substrate according to claim 5, characterized in that: The at least one color deviation adjustment unit is formed by doping the reversible thermochromic material, the reversible thermochromic transmittance changing material or the heated thickness changing material into the light extraction layer.

7. The display substrate according to claim 3, characterized in that: Also includes: The encapsulation layer is located on the display side of the display function layer, and the at least one color deviation adjustment unit is arranged in the encapsulation layer.

8. The display substrate according to claim 7, characterized in that: The at least one color deviation adjustment unit is formed by doping the reversible thermochromic material or the reversible thermotransmittance changing material into the encapsulation layer.

9. The display substrate according to claim 1, characterized in that: The first type of light emitting device is a light emitting device that can emit blue light, and the second type of light emitting device is at least one of a light emitting device that can emit red light and a light emitting device that can emit green light.

10. A display panel, characterized in that: The display substrate comprises the display substrate as claimed in any one of claims 1 to 9.

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