OLED display panel capable of replacing COE technology, preparation method thereof and optical application device

Abstract

The invention provides an OLED display panel capable of replacing a COE technology, a preparation method of the OLED display panel and an optical application device. The OLED display panel comprises a dye liquid crystal polarization layer, wherein the dye liquid crystal polarization layer comprises an upper TAC layer, an FPR type alignment layer and a coating type dye liquid crystal PVA layer which are mutually coated, stacked and connected; the phase compensation layer comprises a lower TAC layer and a quarter phase delay layer, the lower TAC layer is provided with two opposite surfaces, one surface is connected with the coating type dye liquid crystal PVA layer, and the other surface is laminated and attached to the quarter phase delay layer; the RGB cholesteric liquid crystal layer comprises an R cholesteric liquid crystal layer, a G cholesteric liquid crystal layer and a B cholesteric liquid crystal layer which are arranged in a laminated mode, the three layers are connected through an attaching adhesive layer, and the RGB cholesteric liquid crystal layer is formed by coating left-handed or right-handed cholesteric liquid crystals. Wherein the FPR type alignment layer has a first alignment angle of 0 degree and a second alignment angle of 90 degrees. The COE technology can be replaced, the thickness of the OLED display panel is reduced, and the OLED display panel can be applied to a light-emitting diode display.

Description

Technical Field

[0001] The present invention relates to the technical field of optical elements, and in particular to an OLED display panel that can replace COE technology, a preparation method thereof, and an optical application device. Background Art

[0002] The development of displays has gone through a century. From the early large cathode ray tube screens (CRT), plasma displays, to liquid crystal displays, and now the popular organic light-emitting diode (OLED) displays, the market supply and demand situation has changed from insufficient supply to oversupply. In order to meet the market's increasing demand for display performance, displays are constantly developing in the direction of exquisite display images, thin and light, power-saving, and ultra-thin flexible screens, and display technology is also continuously improving. Among them, AMOLED COE (Color On Encapsulation) depolarizer screen technology came into being and is regarded as the representative of the next generation of display technology. This technology can significantly improve the display effect of OLED screens and effectively reduce power consumption, which has important practical significance and application value.

[0003] The principle of COE (Color On Encapsulation) depolarizer screen technology is that the key is to suppress reflectivity due to the removal of the circular polarizer. COE technology consists of BM, R / G / B color filters and O / C cover layer (for flat surface). Specifically, it is to make color filters CF (ColorFilter) of corresponding colors in the corresponding areas of the luminous pixels of the OLED screen, and make black matrix BM (black matrix) in the pixel gap to prevent reflected light and improve transmittance. This technology requires five masks to add BM, R / G / B color filters and O / C layers for stacking. At the same time, the PDL (pixel definition layer) between each pixel will also be made of black opaque material to ensure that each pixel does not interfere with each other and can absorb any light passing through the color filter, thereby blocking the reflection of the TFT below. However, the COE process requires five masks to realize the COE function, which is a complicated process and costly. Summary of the invention

[0004] The embodiments of the present invention provide an OLED display panel and a preparation method and an optical application device that can replace the COE technology. The current COE depolarizer screen technology requires five masks to be implemented, and the process is relatively complex and the cost is high.

[0005] The core technology of the present invention is mainly to provide a new OLED display panel, including a dye liquid crystal polarizing layer, a phase compensation layer and an RGB cholesteric liquid crystal layer. Through the specific layer structure setting and parameter range setting, the phase compensation layer has good anti-reflection and anti-reflection properties in the full light range and at all angles, solving the problem of interference of external incident light sources on organic light emitting diode display devices.

[0006] In a first aspect, the present invention provides an OLED display panel that can replace COE technology, including: The dye liquid crystal polarizing layer comprises an upper TAC layer, an FPR type alignment layer and a coating type dye liquid crystal PVA layer which are coated and stacked with each other; The phase compensation layer includes a lower TAC layer and a quarter phase retardation layer, wherein the lower TAC layer has two oppositely disposed sides, one side is connected to the coating dye liquid crystal PVA layer, and the other side is laminated and bonded to the quarter phase retardation layer; The RGB cholesteric liquid crystal layer comprises R, G, and B cholesteric liquid crystal layers which are stacked and connected by a bonding adhesive layer. The RGB cholesteric liquid crystal layer is formed by coating left-handed or right-handed cholesteric liquid crystal. The FPR type alignment layer has a first alignment angle of 0° and a second alignment angle of 90°.

[0007] Furthermore, the dye liquid crystal polarizing layer, the phase compensation layer and the RGB cholesteric liquid crystal layer are laminated to each other using a laminating adhesive layer.

[0008] Furthermore, the phase compensation layer further comprises a positive C-plate viewing angle compensation film, and the positive C-plate viewing angle compensation film is coated on a side of the lower TAC layer away from the coated quarter phase delay layer.

[0009] Furthermore, the plane phase difference of the quarter phase retardation layer is 110-170nm, and the angle between the optical axis of the quarter phase retardation layer and the absorption axis of the dye liquid crystal polarizing layer is in the range of ±40°-±50°.

[0010] Furthermore, the wavelength bandwidth of the RGB cholesteric liquid crystal layer at a reflectivity of more than 70% is 10-80nm.

[0011] Furthermore, the wavelength bandwidth of the RGB cholesteric liquid crystal layer at a reflectivity of more than 70% is 20-50 nm.

[0012] Further, the central reflectivity wavelength range of the R cholesteric liquid crystal layer in the RGB cholesteric liquid crystal layer is 600-680 nm; the central reflectivity wavelength range of the G cholesteric liquid crystal layer is 500-580 nm; and the central reflectivity wavelength range of the B cholesteric liquid crystal layer is 400-480 nm.

[0013] Furthermore, the quarter phase retardation layer adopts any one of a liquid crystal type A plate reverse dispersion phase retardation film, a liquid crystal type O plate reverse dispersion phase retardation film or a liquid crystal type biaxial B plate reverse dispersion phase retardation film.

[0014] In a second aspect, the present invention provides a method for preparing the above-mentioned OLED display panel that can replace the COE technology. The method is used to prepare a dye liquid crystal polarizing layer, comprising the following steps: After the FPR alignment layer is manufactured on the upper TAC layer by using the FPR process, dye liquid crystal is coated to manufacture the dye liquid crystal polarizing layer.

[0015] In a third aspect, the present invention provides an optical application device, comprising the above-mentioned OLED display panel that can replace the COE technology.

[0016] The main contributions and innovations of the present invention are as follows: 1. Can replace COE technology: Provides a new OLED display panel that can replace COE technology, providing a new option for the development of displays.

[0017] 2. Improve display performance: Improve contrast: Through the synergistic effect of the dye liquid crystal polarizing layer, phase compensation layer and RGB cholesteric liquid crystal layer, the reflectivity can be effectively reduced, the contrast of the display can be improved, and the display image can be clearer. Accurate color control: The central reflectivity wavelength range of the R, G, and B cholesteric liquid crystal layers in the RGB cholesteric liquid crystal layer is clear, which can achieve more accurate color control and make the display image more exquisite.

[0018] 3. Enhanced anti-glare and anti-reflection properties: Phase compensation layer characteristics: The plane phase difference value of the quarter phase delay layer and the angle range between the optical axis and the absorption axis of the polarizing layer are set to give it good anti-reflection and anti-reflection properties, which can effectively eliminate the interference of external incident light sources on organic light-emitting diode display devices.

[0019] Reverse dispersion phase delay film: The quarter phase delay layer adopts any one of the liquid crystal type A plate reverse dispersion phase delay film, liquid crystal type O plate reverse dispersion phase delay film or liquid crystal type biaxial B plate phase delay film, which further enhances the anti-glare and anti-reflection effects.

[0020] 4. Improve the uniformity of the color chromaticity of different viewing angles: The phase compensation layer includes a positive C-plate viewing angle compensation film, which can supplement the phase difference changes of the original liquid crystal layer at different angles, offset the color differences of different viewing angles, and improve the uniformity of the color chromaticity of different viewing angles.

[0021] 5. Meet the needs of thinness and flexibility: Reduce thickness: The optimized design and bonding method of each layer structure can help reduce the thickness of OLED display panels, making them more in line with the development trend of thin and light displays.

[0022] Suitable for flexible devices: It can be applied to flexible devices such as flexible mobile phones (folding mobile phones), with a smaller bending radius, which improves the comfort of users.

[0023] In summary, the solution described in the present invention has significant beneficial effects in terms of display performance, anti-glare and anti-reflection, uniformity of viewing angle, and thinness and flexibility, and has obvious advantages over the prior art.

[0024] The details of one or more embodiments of the invention are set forth in the following drawings and description so that other features, objects, and advantages of the invention are more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a structural diagram of an OLED display panel that can replace COE technology according to an embodiment of the present invention; Figure 2 is a FPR absorption axis angle distribution diagram according to an embodiment of the present invention; Figure 3 is a schematic diagram according to an embodiment of the present invention; Figure 4 is a comparison curve of light transmittance spectra of the present invention according to an embodiment of the present invention and the existing COE technology; Figure 5 is a B reflectivity comparison curve diagram of the present invention according to an embodiment of the present invention and the existing COE technology; Figure 6 is a G reflectivity comparison curve diagram of the present invention according to an embodiment of the present invention and the existing COE technology; Figure 7 3 is a comparison curve of R reflectivity between the present invention according to an embodiment of the present invention and the existing COE technology.

[0026] In the figure, 100, dye liquid crystal polarizing layer; 101, upper TAC layer; 102, FPR type alignment layer; 103, coated dye liquid crystal PVA layer; 200, phase compensation layer; 201, quarter phase delay layer; 202, lower TAC layer; 203, positive C-plate viewing angle compensation film; 300, RGB cholesteric liquid crystal layer; 301, R cholesteric liquid crystal layer; 302, G cholesteric liquid crystal layer; 303, B cholesteric liquid crystal layer; 400, bonding adhesive. DETAILED DESCRIPTION

[0027] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with one or more embodiments of this specification. Instead, they are merely examples of devices and methods consistent with some aspects of one or more embodiments of this specification as detailed in the appended claims.

[0028] It should be noted that: in other embodiments, the steps of the corresponding method are not necessarily performed in the order shown and described in this specification. In some other embodiments, the steps included in the method may be more or less than those described in this specification. In addition, a single step described in this specification may be decomposed into multiple steps for description in other embodiments; and multiple steps described in this specification may be combined into a single step for description in other embodiments.

[0029] The COE process requires five masks to achieve the COE function, which is relatively complex and costly.

[0030] Based on this, the present invention solves the problems existing in the prior art based on an OLED display panel that can replace the COE technology.

[0031] Embodiment 1 The present invention aims to propose an OLED display panel that can replace COE technology. Specifically, referring to Figure 1 ,include: The dye liquid crystal polarizing layer 100 includes an upper TAC layer 101, an FPR type alignment layer 102 and a coating type dye liquid crystal PVA layer 103 which are coated and stacked with each other; The phase compensation layer 200 includes a lower TAC layer 202 and a quarter phase retardation layer 201. The lower TAC layer 202 has two oppositely disposed sides, one side is connected to the coating dye liquid crystal PVA layer 103, and the other side is laminated with the quarter phase retardation layer 201; The plane phase difference of the quarter phase retarder layer 201 is 110-170 nm, and the angle between the optical axis of the quarter phase retarder layer 201 and the absorption axis of the dye liquid crystal polarizing layer 100 is in the range of ±40°-±50°.

[0032] The RGB cholesteric liquid crystal layer 300 includes a stacked R cholesteric liquid crystal layer 301, a G cholesteric liquid crystal layer 302, and a B cholesteric liquid crystal layer 303. The three layers are connected by a bonding adhesive layer. The RGB cholesteric liquid crystal layer 300 is coated with left-handed or right-handed cholesteric liquid crystal.

[0033] The dye liquid crystal polarizing layer 100 , the phase compensation layer 200 and the RGB cholesteric liquid crystal layer 300 are laminated to each other using a laminating adhesive layer 400 .

[0034] In one embodiment of the present invention, the FPR type alignment layer 102 in the dye liquid crystal polarizing layer 100 has a first alignment angle of 0° and a second alignment angle of 90°. The dye liquid crystal polarizing layer 100 is used as a component to implement a polarization mechanism, so that natural light without polarization is polarized and converted into polarized light. The dye liquid crystal polarizing layer 100 has the characteristics of FPR, that is, its unique grating structure can make the dye liquid crystal arrange different absorption axis angles at different grating positions, and the specific absorption axis angles are 0° and 90°, such as Figure 2 .

[0035] In one embodiment provided by the present invention, the plane phase difference value of the phase compensation layer 200 is set to 120-160 nm.

[0036] In one embodiment provided by the present invention, the phase compensation layer 200 further includes a positive C-plate viewing angle compensation film 203, which is coated on the side of the lower TAC layer 202 away from the coated quarter phase delay layer 201. Therefore, the positive C-plate viewing angle compensation film 203 provides an additional phase difference to supplement the phase difference change of the original liquid crystal layer at different angles as much as possible, offset the color difference of different viewing angles, and improve the uniformity of different viewing angles.

[0037] In an embodiment provided by the present invention, the phase difference value of the phase compensation layer 200 in the composite vertical plane is -50-50nm; preferably, the phase difference value of the phase compensation layer 200 in the composite vertical plane is -40-40nm.

[0038] Through the above-mentioned layer structure setting and parameter range setting, the phase compensation layer 200 has the characteristic that the longer the wavelength, the larger the phase difference value, so that the phase compensation layer 200 has good anti-reflection properties in the visible light wavelength range of the full light range, and has anti-reflection properties that can effectively eliminate light reflection at different viewing angles at all angles, and is used to eliminate the problem of interference caused by external incident light sources entering the organic light emitting diode display device in the full light range and at all angles.

[0039] Among them, the quarter phase retarder layer 201 is an optical film that can reversibly convert linear polarized light and circular polarized light. In a specific application scenario, a linear polarizer is used to convert natural light into linear polarized light, and the quarter phase retarder layer 201 is used to reversibly convert the obtained linear polarized light into circular polarized light. The circular polarized light itself can be converted in direction when it is reflected by the reflective surface. For example, left-handed circular polarized light is converted into right-handed circular polarized light when it is reflected by the reflective surface, and right-handed circular polarized light is converted into left-handed circular polarized light when it is reflected by the reflective surface.

[0040] In one embodiment of the present invention, the phase compensation layer 200 is a liquid crystal reverse dispersion film, the quarter phase delay layer 201 is a liquid crystal film with reverse dispersion characteristics, and the positive C-plate viewing angle compensation film 203 is a liquid crystal film with a vertical in-plane phase difference characteristic.

[0041] In one embodiment provided by the present invention, the quarter phase retardation layer 201 is any one of a liquid crystal type A plate reverse dispersion phase retardation film, a liquid crystal type O plate reverse dispersion phase retardation film or a liquid crystal type biaxial B plate reverse dispersion phase retardation film. Therefore, the composite film formed after the combination can achieve the reverse dispersion effect.

[0042] Among them, the phase compensation layer 200 has the characteristic that the longer the wavelength, the greater the phase difference value, so that the phase compensation layer 200 has good anti-reflection properties in the visible light wavelength range of the full light range, which is used to eliminate the problem of interference caused by external incident light source incident on the organic light emitting diode display device in the full light range.

[0043] In one embodiment provided by the present invention, the wavelength bandwidth of the RGB cholesteric liquid crystal layer 300 at a reflectivity of more than 70% is 10-80 nm; preferably, the wavelength bandwidth is 20-50 nm.

[0044] In one embodiment of the present invention, the central reflectivity wavelength range of the R cholesteric liquid crystal layer 301 in the RGB cholesteric liquid crystal layer 300 is 600-680nm; the central reflectivity wavelength range of the G cholesteric liquid crystal layer 302 is 500-580nm; and the central reflectivity wavelength range of the B cholesteric liquid crystal layer 303 is 400-480nm.

[0045] like Figure 3 As shown, the FPR grating where the 0° absorption axis of the dye liquid crystal polarizing layer is located is aligned with the pixel position.

[0046] In the optical path ①, the light emitted by the pixel can be regarded as natural light. When passing through the RGB cholesteric liquid crystal layer 300, 50% of the light will be converted into left-handed circularly polarized light and transmitted, and 50% of the light will be converted into right-handed circularly polarized light and reflected back to the pixel. After half-wave loss, it will be converted into left-handed circularly polarized light and emitted through the RGB cholesteric liquid crystal layer 300. When passing through the phase compensation layer 200, it will be converted into 0° linear polarized light and emitted from the position of the 0° absorption axis in the dye liquid crystal polarizing layer 100. At this time, the light emitted by the pixel can be fully transmitted and will not be absorbed by more than half of the polarizer, thereby achieving the effect of brightening and reducing consumption.

[0047] In optical path ②, when external light passes through the dye liquid crystal polarizing layer 100 where the absorption axis is 0°, the transmitted light is also converted into 0° linear polarized light. When the angle between the optical axis of the quarter phase delay layer 201 in the phase compensation layer 200 and the 0° absorption axis in the dye liquid crystal polarizing layer 100 is -40°~-50°, the linear polarized light passing through the phase compensation layer 200 is converted into left-handed circularly polarized light. When the RGB cholesteric liquid crystal layer 300 is a right-handed cholesteric liquid crystal, its left-handed circularly polarized light will pass through the RGB cholesteric liquid crystal layer 300 and be incident on the pixel point. After reflection, the original left-handed circularly polarized light will be converted into right-handed circularly polarized light due to the half-wave loss characteristic and emitted. The RGB cholesteric liquid crystal layer 300 will reflect the right-handed circularly polarized light back to the pixel point and undergo half-wave loss again to form left-handed circularly polarized light emission. After passing through the RGB cholesteric liquid crystal layer 300 and then passing through the phase compensation layer 200, it will be converted back into 0° linear polarized light. A part of it will be emitted from the position of the 0° absorption axis in the dye liquid crystal polarizing layer 100, and a part of it will be absorbed by the position of the 90° absorption axis in the dye liquid crystal polarizing layer 100, thereby achieving the effects of increasing screen brightness, reducing energy consumption and reducing reflection.

[0048] In the optical path ③, when the external light passes through the dye liquid crystal polarizing layer 100 at a position where the absorption axis is 90°, the transmitted light is also converted into 90° linear polarized light. When the angle between the optical axis of the quarter phase delay layer 201 in the phase compensation layer 200 and the 90° absorption axis in the dye liquid crystal polarizing layer 100 is -40° to -50°, the linear polarized light passing through the phase compensation layer 200 is converted into right-handed circular polarized light. When the RGB cholesteric liquid crystal layer 300 is right-handed cholesteric liquid crystal, its right-handed circular polarized light will be reflected by the RGB cholesteric liquid crystal layer 300. Similarly, when passing through the phase compensation layer 200, it is converted back into 90° linear polarized light, part of which is emitted from the position of the 90° absorption axis in the dye liquid crystal polarizing layer 100, and part of which is absorbed by the position of the 0° absorption axis in the dye liquid crystal polarizing layer 100, thereby achieving the effect of transmission and reducing reflection.

[0049] Thus, the present invention solves the problems existing in the prior art in the following ways: 1. A new OLED display panel is provided, comprising a dye liquid crystal polarizing layer 100, a phase compensation layer 200 and an RGB cholesteric liquid crystal layer 300, whereby the OLED display panel has the transmission function of COE, as well as better anti-reflection performance than COE, and has a lower reflectivity, so as to replace the COE technology.

[0050] 2. The dye liquid crystal polarizing layer 100 has the characteristics of FPR, which can arrange the dye liquid crystal at different positions with different absorption axis angles (0° and 90°), so that the OLED display panel has the transmission function of COE, as well as better anti-reflection performance than COE and lower reflectivity.

[0051] 3. The phase compensation layer 200 has the characteristic that the longer the wavelength, the greater the phase difference. It has good anti-reflection properties in the visible light wavelength range of the entire optical domain, and has anti-reflection properties that can effectively eliminate light reflection at different viewing angles at all angles, and can eliminate the problem of interference caused by external incident light sources incident on the organic light emitting diode display device.

[0052] 4. The configuration of the RGB cholesteric liquid crystal layer 300 further enhances the performance of the OLED display panel, such as a specific central reflectivity wavelength range and wavelength bandwidth.

[0053] Through the above innovative layer structure and parameter settings, the OLED display panel of the present invention can meet market demand in terms of performance, while avoiding the problems of complex COE process and high cost. The overall advantage is thinning, which can be used for folding screens, with a thickness of 50-80μm and a polarization degree of 99.8%.

[0054] The reflectivity comparison with the existing COE technology is shown in the following table: Table 1

[0055] Table 2

[0056] like Figure 4-Figure 7 As shown in Tables 1 and 2, it can be seen that the transmittance of the present invention (FPR coated polarizer) is better than that of the COE solution in the entire band, and the reflectivity difference at the central wavelength is not large. At the same time, the FPR polarizer has the characteristics of being thinner and having better bending performance. It is also better than the COE solution in terms of preparation process and manufacturing cost.

[0057] Embodiment 2 Based on the same concept, the present invention provides a method for preparing an OLED display panel that can replace the COE technology of the first embodiment. The method is used to prepare a dye liquid crystal polarizing layer 100, and includes the following steps: After the FPR alignment layer is manufactured on the upper TAC layer 101 by using the FPR process, dye liquid crystal is coated to manufacture the dye liquid crystal polarizing layer 100 .

[0058] Preferably, the phase compensation layer 200 is a positive C-plate viewing angle compensation film 203, a lower TAC layer 202, a bonding adhesive layer 400, and a quarter phase delay layer 201 which are sequentially stacked and coated.

[0059] Embodiment 3 The present invention further provides an optical application device, comprising the OLED display panel in the above-mentioned embodiment 1. The optical application device composed of the cholesterol liquid crystal brightness enhancement film and the OLED display panel in the above-mentioned embodiment 1 can be applied to a device having an OLED display panel to improve the overall brightness enhancement efficiency and alleviate the problems of large viewing angle difference and natural light reflection.

[0060] Among them, light-emitting diodes include organic light-emitting diodes (OLED) and quantum dot light-emitting diodes (QLED). Devices using organic light-emitting diode displays can be bracelets, folding phones, VR devices, and so on.

[0061] Those skilled in the art should understand that the technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An OLED display panel that can replace COE technology, characterized in that: include: The dye liquid crystal polarizing layer comprises an upper TAC layer, an FPR type alignment layer and a coating type dye liquid crystal PVA layer which are coated and stacked with each other; The phase compensation layer comprises a lower TAC layer and a quarter phase retardation layer, wherein the lower TAC layer has two oppositely disposed sides, one side is connected to the coating type dye liquid crystal PVA layer, and the other side is laminated and bonded to the quarter phase retardation layer; RGB cholesteric liquid crystal layer, including R, G, B cholesteric liquid crystal layers arranged in a stacked manner, the three layers are connected by a bonding adhesive layer, and the RGB cholesteric liquid crystal layer is formed by coating left-handed or right-handed cholesteric liquid crystal; Wherein, the FPR type alignment layer has a first alignment angle of 0° and a second alignment angle of 90°.

2. The OLED display panel capable of replacing COE technology as claimed in claim 1, characterized in that: The dye liquid crystal polarizing layer, the phase compensation layer and the RGB cholesteric liquid crystal layer are laminated to each other using a laminating adhesive layer.

3. The OLED display panel capable of replacing COE technology as claimed in claim 1, characterized in that: The phase compensation layer further includes a positive C-plate viewing angle compensation film, which is coated on a side of the lower TAC layer away from the coated quarter phase delay layer.

4. The OLED display panel capable of replacing COE technology as claimed in claim 1, characterized in that: The plane phase difference of the quarter phase delay layer is 110-170nm, and the angle between the optical axis of the quarter phase delay layer and the absorption axis of the dye liquid crystal polarizing layer is in the range of ±40°-±50°.

5. The OLED display panel capable of replacing COE technology as claimed in claim 1, characterized in that: The wavelength bandwidth of the RGB cholesteric liquid crystal layer at a reflectivity of more than 70% is 10-80nm.

6. The OLED display panel capable of replacing COE technology as claimed in claim 5, characterized in that: The wavelength bandwidth of the RGB cholesteric liquid crystal layer at a reflectivity of more than 70% is 20-50nm.

7. The OLED display panel capable of replacing COE technology as claimed in claim 1, characterized in that: The central reflectivity wavelength range of the R cholesteric liquid crystal layer in the RGB cholesteric liquid crystal layer is 600-680nm; the central reflectivity wavelength range of the G cholesteric liquid crystal layer is 500-580nm; and the central reflectivity wavelength range of the B cholesteric liquid crystal layer is 400-480nm.

8. The OLED display panel capable of replacing COE technology according to any one of claims 1 to 7, characterized in that: The quarter phase retardation layer is any one of a liquid crystal type A plate reverse dispersion phase retardation film, a liquid crystal type O plate reverse dispersion phase retardation film or a liquid crystal type biaxial reverse dispersion phase retardation film.

9. A method for preparing an OLED display panel capable of replacing COE technology as claimed in any one of claims 1 to 8, wherein the method is used for preparing a dye liquid crystal polarizing layer, characterized in that: The following steps are involved: After the FPR alignment layer is manufactured on the upper TAC layer by using the FPR process, dye liquid crystal is coated to manufacture the dye liquid crystal polarizing layer.

10. An optical application device, characterized in that: An OLED display panel comprising the COE-replaceable technology as described in any one of claims 1-8.

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