Organic light emitting diode display device

Abstract

The utility model discloses an organic light emitting diode display device, which comprises a plurality of pixel units arranged in an array, each pixel unit comprises a plurality of sub-pixels with different colors, and each sub-pixel comprises an anode, a hole injection layer and an electron blocking layer; wherein the sub-pixels of different colors comprise a green sub-pixel, a blue sub-pixel and a red sub-pixel, and the film thickness of the hole injection layer in the green sub-pixel is smaller than the film thickness of the hole injection layer in the blue sub-pixel and the film thickness of the hole injection layer in the red sub-pixel. The film thickness of the electron barrier layer in the green sub-pixel is greater than the film thickness of the electron barrier layer in the blue sub-pixel and the film thickness of the electron barrier layer in the red sub-pixel; and the electron blocking layers in the sub-pixels with different colors are arranged at intervals. According to the utility model, the smear color cast phenomenon can be weakened.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially relates to a kind of organic light emitting diode display devices. BACKGROUND

[0002] With the development of organic light emitting diode (Organic Light-Emitting Diode, OLED) technology, OLED has been widely used in display and lighting fields due to its good light emitting characteristics and low energy consumption. In recent years, with the continuous maturity of OLED technology, users have increasingly high demands on display taste. In low brightness or low gray scale, dragging OLED screen will cause ghosting phenomenon, which greatly affects user experience in this application scenario. This phenomenon is generally referred to as motion blur in dark mode.

[0003] The cause of motion blur in dark mode is the combined effect of transistor hysteresis and OLED capacitance. When the white picture is composed of RGB single color, ghosting and color deviation occur due to the difference in brightness of the first frame when the display device changes from dark to bright or different pictures are switched. The OD (over drive) algorithm can improve the brightness of the first frame to reduce the ghosting phenomenon. However, due to the difference in RGB OLED capacitance, this method cannot solve the color deviation problem caused by the difference in brightness of three colors. SUMMARY

[0004] The utility model provides a kind of organic light emitting diode display device, can weaken ghosting color deviation phenomenon.

[0005] The utility model provides a kind of organic light emitting diode display device, including a plurality of pixel units arranged in array, each pixel unit includes a plurality of different color sub-pixels, each sub-pixel includes hole injection layer and electron blocking layer;Different color sub-pixels include green sub-pixel, blue sub-pixel and red sub-pixel, the film thickness of hole injection layer in green sub-pixel is less than the film thickness of hole injection layer in blue sub-pixel and the film thickness of hole injection layer in red sub-pixel, the film thickness of electron blocking layer in green sub-pixel is greater than the film thickness of electron blocking layer in blue sub-pixel and the film thickness of electron blocking layer in red sub-pixel;Electron blocking layer in different color sub-pixels is spaced apart.

[0006] Optionally, the organic light emitting diode display device further comprises a substrate, the hole injection layer comprises a first hole injection layer and a second hole injection layer; the first hole injection layer is located on one side of the substrate; the second hole injection layer is located on a side of the first hole injection layer away from the substrate; the first hole injection layer in the sub-pixels of different colors is integrally provided; the film thickness of the second hole injection layer in the blue sub-pixel is equal to the film thickness of the second hole injection layer in the red sub-pixel, and the green sub-pixel is free of the second hole injection layer; the film thickness of the electron blocking layer in the blue sub-pixel is equal to the film thickness of the electron blocking layer in the red sub-pixel.

[0007] Optionally, the difference between the film thickness of the electron blocking layer in the green sub-pixel and the film thickness of the electron blocking layer in the blue sub-pixel is the film thickness of the second hole injection layer in the blue sub-pixel.

[0008] Optionally, the film thickness of the second hole injection layer in the blue sub-pixel ranges from 2 nm to 5 nm.

[0009] Optionally, the film thickness of the first hole injection layer ranges from 5 nm to 8 nm.

[0010] Optionally, the film thickness of the electron blocking layer in the blue sub-pixel ranges from 8 nm to 12 nm, and the film thickness of the electron blocking layer in the green sub-pixel ranges from 10 nm to 17 nm.

[0011] Optionally, the organic light emitting diode display device further comprises a substrate, the hole injection layer comprises a first hole injection layer and a second hole injection layer, and each sub-pixel further comprises a first electrode, a hole transport layer, a light emitting layer, an electron transport layer and a second electrode; the first electrode is located on one side of the substrate; the first hole injection layer is located on a side of the first electrode away from the substrate; the second hole injection layer is located on a side of the first hole injection layer away from the substrate; the hole transport layer is located on a side of the second hole injection layer away from the substrate; the electron blocking layer is located on a side of the hole transport layer away from the substrate; the light emitting layer is located on a side of the electron blocking layer away from the substrate; the electron transport layer is located on a side of the light emitting layer away from the substrate; and the second electrode is located on a side of the electron transport layer away from the substrate.

[0012] Optionally, the first electrode, the hole transport layer, the electron transport layer and the second electrode in the sub-pixels of different colors are integrally provided.

[0013] Optionally, the green sub-pixel and the red sub-pixel further comprise an optical adjustment layer, and the optical adjustment layer in the green sub-pixel and the optical adjustment layer in the red sub-pixel are both located between the hole transport layer and the electron blocking layer.

[0014] Optionally, the film thickness of the optical adjustment layer in the green sub-pixel is less than the film thickness of the optical adjustment layer in the red sub-pixel.

[0015] The organic light emitting diode display device provided by the embodiment of the utility model, through setting the film thickness of the hole injection layer in the green sub-pixel is less than the film thickness of the hole injection layer in the blue sub-pixel and the film thickness of the hole injection layer in the red sub-pixel, the film thickness of the electron blocking layer in the green sub-pixel is greater than the film thickness of the electron blocking layer in the blue sub-pixel and the film thickness of the electron blocking layer in the red sub-pixel, the capacitance of the green sub-pixel can be reduced, the capacitance of the green sub-pixel is close to the capacitance of the red sub-pixel and the blue sub-pixel, the RGB capacitance balance is achieved, when the RGB capacitance balance is achieved, the response speed of each color sub-pixel in the charging and discharging process tends to be consistent, when the image is switched fast, the brightness ratio of each sub-pixel display tends to be consistent, thereby the ghost color phenomenon is effectively weakened, and the quality and stability of the displayed image are improved.

[0016] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below, obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0018] Figure 1 It is the structural schematic diagram of the organic light emitting diode display device provided by the embodiment of the utility model.

[0019] Figure 2 It is the structural schematic diagram of the pixel unit provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiment of the utility model, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of the protection of the utility model.

[0021] It should be noted that the terms "first", "second", and the like in the description and claims of the utility model and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0022] Figure 1 It is a structural schematic diagram of an organic light emitting diode display device provided by the embodiments of the utility model. Figure 2 It is a structural schematic diagram of a pixel unit provided by the embodiments of the utility model. In combination with Figure 1 And Figure 2 The organic light emitting diode display device includes a plurality of pixel units 10 arranged in an array, each pixel unit 10 includes a plurality of sub-pixels of different colors, each sub-pixel includes a hole injection layer (HIL) 100 and an electron blocking layer (EBL) 200;Wherein, the sub-pixels of different colors include green sub-pixels, blue sub-pixels and red sub-pixels, the film thickness of the hole injection layer 100 in the green sub-pixel is less than the film thickness of the hole injection layer 100 in the blue sub-pixel and the film thickness of the hole injection layer 100 in the red sub-pixel, the film thickness of the electron blocking layer 200 in the green sub-pixel is greater than the film thickness of the electron blocking layer 200 in the blue sub-pixel and the film thickness of the electron blocking layer 200 in the red sub-pixel;The electron blocking layer 200 in the sub-pixel of different colors is arranged at intervals.

[0023] Specifically, in display devices such as organic light emitting diodes (OLED), the microcavity structure has an important influence on the output characteristics of light. The microcavity is an optical resonant cavity composed of different functional layers in the device. When light propagates in the microcavity, multiple reflections and interferences occur, thereby affecting the wavelength, intensity and angular distribution characteristics of the outgoing light.

[0024] In display devices, the size of the capacitance will affect the charging and discharging speed of the pixel. When the capacitances of different color sub-pixels (RGB) are inconsistent, the response speed of each pixel in the charging and discharging process will be different. For example, when the image is quickly switched, the pixel with larger capacitance may not complete charging or discharging in time, thereby appearing a ghosting phenomenon. At the same time, due to the capacitance difference of each pixel, the light emitting intensity and time characteristics of different color sub-pixels may also be inconsistent during the display process, thereby producing color cast phenomenon.

[0025] Since the capacitance of the green sub-pixel is higher than that of the red sub-pixel and the blue sub-pixel, by reducing the film thickness of the hole injection layer 100 in the green sub-pixel and increasing the film thickness of the electron blocking layer 200 in the green sub-pixel, the adjustment changes the capacitance characteristics of the green sub-pixel. The film thickness changes of the HIL layer and the EBL layer affect the dielectric constant distribution and the charge storage and transmission characteristics between adjacent layers, thereby reducing the capacitance of the green sub-pixel. The capacitance of the green sub-pixel is close to that of the red sub-pixel and the blue sub-pixel, achieving RGB capacitance balance.

[0026] The organic light-emitting diode display device provided by the embodiment of the utility model, through setting the film thickness of the hole injection layer in the green sub-pixel is less than the film thickness of the hole injection layer in the blue sub-pixel and the film thickness of the hole injection layer in the red sub-pixel, the film thickness of the electron blocking layer in the green sub-pixel is greater than the film thickness of the electron blocking layer in the blue sub-pixel and the film thickness of the electron blocking layer in the red sub-pixel, can reduce the capacitance of the green sub-pixel. The capacitance of the green sub-pixel is close to that of the red sub-pixel and the blue sub-pixel, achieving RGB capacitance balance, when RGB capacitance balance, the response speed of each color sub-pixel in the charging and discharging process tends to be consistent. In the image fast switching, each sub-pixel can more accurately emit light and extinguish according to the signal requirement, thereby effectively weakening the ghost color phenomenon, improving the quality and stability of the display image.

[0027] Optionally, continuing to refer to Figure 2 The organic light-emitting diode display device further comprises a substrate 300, and the hole injection layer 100 comprises a first hole injection layer 101 and a second hole injection layer 102.

[0028] The first hole injection layer 101 is located on one side of the substrate 300; the second hole injection layer 102 is located on the side of the first hole injection layer 101 away from the substrate 300; the first hole injection layer 101 in the sub-pixels of different colors is integrally arranged; the film thickness of the second hole injection layer 102 in the blue sub-pixel is equal to the film thickness of the second hole injection layer 102 in the red sub-pixel, and the green sub-pixel is free of the second hole injection layer 102; the film thickness of the electron blocking layer 200 in the blue sub-pixel is equal to the film thickness of the electron blocking layer 200 in the red sub-pixel.

[0029] Specifically, the substrate 300 includes a substrate which can provide a buffer, protection or support for the organic light-emitting module. The substrate can be a flexible substrate, and the material of the flexible substrate can be polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET) or the like, or a mixed material of the above materials. The substrate can also be a hard substrate formed of a material such as glass. Of course, in other embodiments, the substrate can also be a silicon-based substrate (such as a silicon carbide (SiC) substrate or a silicon (Si) substrate) or a gallium nitride (GaN) substrate, or other available substrate materials, which are not limited herein.

[0030] The first hole injection layer 101 is located on one side of the substrate 300, and is a bottom part of the hole injection layer and directly contacts the anode or the cathode. The first hole injection layer 101 in different color sub-pixels is integrally provided. This arrangement can simplify the preparation process and reduce the process complexity and cost. At the same time, the integrally provided hole injection layer helps to ensure the uniformity of hole injection in the entire display area, and avoids the problem of uneven display caused by the difference in the first hole injection layer 101 of different sub-pixels.

[0031] The second hole injection layer 102 is located on the side of the first hole injection layer 101 away from the substrate 300, and is a functional layer for further optimizing the hole injection based on the first hole injection layer. The film thickness of the second hole injection layer 102 in the blue sub-pixel is equal to the film thickness of the second hole injection layer 102 in the red sub-pixel. This is because the blue sub-pixel and the red sub-pixel maintain the same film thickness of the hole injection layer, which can avoid the capacitance difference caused by the film thickness difference. Optionally, the film thickness of the first hole injection layer is in the range of 5 nm to 8 nm. The film thickness of the second hole injection layer 102 in the blue sub-pixel is in the range of 2 nm to 5 nm.

[0032] There is no second hole injection layer in the green sub-pixel. This is because the film thickness difference of the green sub-pixel from the red and blue sub-pixels highlights this functional layer, thereby adjusting the consistency of the sub-pixel capacitance.

[0033] The electron blocking layer 200 mainly functions to block the diffusion of electrons from the light-emitting layer to the hole transport layer, so that the electrons and holes can more effectively recombine in the light-emitting layer, thereby improving the light-emitting efficiency and the stability of the device. The film thickness of the electron blocking layer 200 in the blue sub-pixel is equal to the film thickness of the electron blocking layer 200 in the red sub-pixel. This indicates that the blue and red sub-pixels have similarities in electron migration characteristics and light-emitting requirements, and the same thickness of the electron blocking layer can provide appropriate electron blocking ability for them, ensure the effective recombination of electrons and holes in the respective light-emitting layers, and achieve similar light-emitting performance.

[0034] Optionally, the first hole injection layer 101 is deposited by a common mask method (CMM). The CMM deposition uses a common mask, which can perform the deposition operation on a large-area substrate at one time, and complete the deposition of the first hole injection layer 101 in multiple sub-pixel regions. Compared with the method of processing each sub-pixel one by one, the production time is greatly reduced, the overall production efficiency is improved, and the method is suitable for large-scale industrial production.

[0035] Optionally, the second hole injection layer 102 is deposited by a fine metal mask (FMM) method. Since the film thickness of the second hole injection layer in the green sub-pixel is 0, and the second hole injection layer with a certain thickness is needed in the blue and red sub-pixels. The FMM deposition can use a metal mask with a fine pattern to accurately deposit organic materials to the sub-pixel region of the specified color, realize the differential setting of the second hole injection layer in each sub-pixel, and thus optimize the hole injection efficiency and light-emitting performance of each sub-pixel.

[0036] Optionally, the difference between the film thickness of the electron blocking layer 200 in the green sub-pixel and the film thickness of the electron blocking layer 200 in the blue sub-pixel is the film thickness of the second hole injection layer 102 in the blue sub-pixel.

[0037] The main function of the electron blocking layer 200 is to block the diffusion of electrons from the light-emitting layer to the hole transport layer, but it also affects the capacitance of the sub-pixel. The thickness change of the electron blocking layer 200 changes the equivalent distance between the electrodes. Under the condition that other conditions remain unchanged, the capacitance of the sub-pixel decreases when the film thickness of the electron blocking layer 200 increases, and the capacitance of the sub-pixel increases when the film thickness of the electron blocking layer 200 decreases. The thicker electron blocking layer 200 in the green sub-pixel will make the capacitance of the green sub-pixel have a decreasing trend, so that the capacitance of the green sub-pixel is close to the capacitance of the red sub-pixel and the blue sub-pixel, and the RGB capacitance balance is achieved.

[0038] Optionally, the film thickness of the electron blocking layer 200 in the blue sub-pixel ranges from 8 nm to 12 nm, and the film thickness of the electron blocking layer 200 in the green sub-pixel ranges from 10 nm to 17 nm.

[0039] Optionally, with reference back to Figure 2Each sub-pixel further comprises a first electrode 400, a hole transport layer 500, a light-emitting layer 600, an electron transport layer 700, and a second electrode 800; the first electrode 400 is located on one side of the substrate 300; the first hole injection layer 101 is located on the side of the first electrode 400 away from the substrate 300; the second hole injection layer 102 is located on the side of the first hole injection layer 101 away from the substrate 300; the hole transport layer 500 is located on the side of the second hole injection layer 102 away from the substrate 300; the electron blocking layer 200 is located on the side of the hole transport layer 500 away from the substrate 300; the light-emitting layer 600 is located on the side of the electron blocking layer 200 away from the substrate 300; the electron transport layer 700 is located on the side of the light-emitting layer 600 away from the substrate 300; and the second electrode 800 is located on the side of the electron transport layer 700 away from the substrate 300.

[0040] Optionally, the organic light-emitting diode display device further comprises a light extraction layer 301 located on the side of the second electrode 800 away from the substrate 300.

[0041] Specifically, the first electrode 400 can serve as an anode, and its main function is to inject holes into the device. The anode material needs to have a high work function to reduce the potential barrier for hole injection and improve the efficiency of hole injection. The material thereof can be indium tin oxide (ITO), which has good conductivity and transparency and can meet the requirements of the electrode of the display device.

[0042] The hole transport layer 500 is used to quickly and efficiently transport the holes injected from the hole injection layer to the light-emitting layer. It needs to have a high hole mobility to ensure that the holes can reach the light-emitting layer in time for recombination with electrons.

[0043] The light-emitting layer 600 is the core part for realizing electric-optical conversion. In the light-emitting layer, the injected holes and electrons meet and recombine to form excitons, and the excitons release energy through radiative transition to produce a light-emitting phenomenon.

[0044] The electron transport layer 700 is used to transport electrons from the second electrode 800 to the light-emitting layer 600. It needs to have a high electron mobility to ensure that the electrons can quickly reach the light-emitting layer 600 for recombination with holes.

[0045] The second electrode 800 can serve as a cathode, and its main function is to inject electrons into the device. The cathode material needs to have a low work function to reduce the potential barrier for electron injection and improve the efficiency of electron injection. The functional layers are arranged in a specific order, so that holes and electrons can be injected, transported, and recombined in the light-emitting layer to emit light in an orderly manner. By reasonably selecting the materials of the functional layers and optimizing parameters such as the thickness thereof, the light-emitting efficiency of the device can be improved, the driving voltage can be reduced, and the service life can be prolonged, so as to meet the requirements of the display device for high brightness, high contrast, high color reproduction, and other performances.

[0046] Optionally, with continued reference to Figure 2 The first electrode 400, the hole transport layer 500, the electron transport layer 700 and the second electrode 800 in the sub-pixels of different colors are integrally formed. Integrally forming the first electrode 400, the hole transport layer 500, the electron transport layer 700 and the second electrode 800 in the sub-pixels of different colors avoids the deposition and patterning steps for each sub-pixel. For example, when preparing the first electrode, if integrally formed, only one large-area deposition process, such as sputtering or evaporation, is needed to simultaneously complete the preparation of the first electrodes of all sub-pixels, without the need for three separate operations for the red, green and blue sub-pixels, greatly simplifying the manufacturing process and improving production efficiency.

[0047] Optionally, with continued reference to Figure 2 The green sub-pixel and the red sub-pixel further comprise an optical adjustment layer 900, and the optical adjustment layer 900 in the green sub-pixel and the optical adjustment layer 900 in the red sub-pixel are both located between the hole transport layer 500 and the electron blocking layer 200. Different colors of light-emitting materials have different light-emitting characteristics and spectral distributions. There are differences in the light-emitting spectrum, light-emitting efficiency and microcavity effect in the device between green and red light-emitting materials. By providing the optical adjustment layer 900 in the green sub-pixel and the red sub-pixel and placing it between the hole transport layer 500 and the electron blocking layer 200, the optical performance of these two color sub-pixels can be optimized. Placing the optical adjustment layer at this position can effectively adjust the propagation and interference of light before the holes are transported to the light-emitting layer, to achieve better light-emitting effect.

[0048] Optionally, with continued reference to Figure 2 The film thickness of the optical adjustment layer 900 in the green sub-pixel is less than the film thickness of the optical adjustment layer 900 in the red sub-pixel. The interference and microcavity effect of light are closely related to the wavelength of light. The wavelength of green light is relatively short, while the wavelength of red light is relatively long. In order to achieve the best interference effect of light of different wavelengths, the thickness of the optical adjustment layer 900 needs to be adjusted. According to the principle of optical interference, a suitable film thickness can cause constructive interference of light of a specific wavelength in the microcavity, enhancing the exit intensity of light of that wavelength and improving the light-emitting efficiency and color purity. Since the wavelength of red light is longer, a thicker optical adjustment layer 900 is usually needed to meet its interference conditions, so the film thickness of the optical adjustment layer 900 in the red sub-pixel is greater than the film thickness of the optical adjustment layer 900 in the green sub-pixel.

[0049] The specific embodiments described above do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An organic light-emitting diode display device, characterized in that, It includes multiple pixel units arranged in an array, each pixel unit including multiple sub-pixels of different colors, and each sub-pixel including a hole injection layer and an electron blocking layer; The sub-pixels of different colors include green sub-pixels, blue sub-pixels, and red sub-pixels. The thickness of the hole injection layer in the green sub-pixel is less than the thickness of the hole injection layer in the blue sub-pixel and the thickness of the hole injection layer in the red sub-pixel. The thickness of the electron blocking layer in the green sub-pixel is greater than the thickness of the electron blocking layer in the blue sub-pixel and the thickness of the electron blocking layer in the red sub-pixel. The electron blocking layers in the sub-pixels of different colors are spaced apart.

2. The organic light-emitting diode display device according to claim 1, characterized in that, It also includes a substrate, and the hole injection layer includes a first hole injection layer and a second hole injection layer; The first hole injection layer is located on one side of the substrate; The second hole injection layer is located on the side of the first hole injection layer away from the substrate; The first hole injection layer in the sub-pixels of different colors is set as a single, integral layer; The thickness of the second hole injection layer in the blue sub-pixel is equal to the thickness of the second hole injection layer in the red sub-pixel, and there is no second hole injection layer in the green sub-pixel; The thickness of the electron blocking layer in the blue sub-pixel is equal to the thickness of the electron blocking layer in the red sub-pixel.

3. The organic light-emitting diode display device according to claim 2, characterized in that, The difference between the thickness of the electron blocking layer in the green sub-pixel and the thickness of the electron blocking layer in the blue sub-pixel is the thickness of the second hole injection layer in the blue sub-pixel.

4. The organic light-emitting diode display device according to claim 2, characterized in that, The thickness of the second hole injection layer in the blue sub-pixel ranges from 2nm to 5nm.

5. The organic light-emitting diode display device according to claim 2, characterized in that, The thickness of the first hole injection layer ranges from 5 nm to 8 nm.

6. The organic light-emitting diode display device according to claim 2, characterized in that, The electron blocking layer in the blue sub-pixel has a film thickness ranging from 8 nm to 12 nm, and the electron blocking layer in the green sub-pixel has a film thickness ranging from 10 nm to 17 nm.

7. The organic light-emitting diode display device according to claim 1, characterized in that, It also includes a substrate, the hole injection layer includes a first hole injection layer and a second hole injection layer, and each sub-pixel also includes a first electrode, a hole transport layer, a light-emitting layer, an electron transport layer and a second electrode; The first electrode is located on one side of the substrate; The first hole injection layer is located on the side of the first electrode away from the substrate; The second hole injection layer is located on the side of the first hole injection layer away from the substrate; The hole transport layer is located on the side of the second hole injection layer away from the substrate; The electron blocking layer is located on the side of the hole transport layer away from the substrate; The light-emitting layer is located on the side of the electron-blocking layer away from the substrate; The electron transport layer is located on the side of the light-emitting layer away from the substrate; The second electrode is located on the side of the electron transport layer away from the substrate.

8. The organic light-emitting diode display device according to claim 7, characterized in that, The first electrode, the hole transport layer, the electron transport layer, and the second electrode in the sub-pixels of different colors are integrally formed.

9. The organic light-emitting diode display device according to claim 7, characterized in that, The green sub-pixel and the red sub-pixel also include an optical adjustment layer, wherein the optical adjustment layer in the green sub-pixel and the optical adjustment layer in the red sub-pixel are both located between the hole transport layer and the electron blocking layer.

10. The organic light-emitting diode display device according to claim 9, characterized in that, The thickness of the optical adjustment layer in the green sub-pixel is less than the thickness of the optical adjustment layer in the red sub-pixel.

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