Display panel, manufacturing method thereof and display device

Abstract

This invention relates to a display panel, comprising an array substrate and a color filter substrate disposed opposite to each other. The color filter substrate includes a color filter layer and an optical adhesive layer covering the light-emitting side of the color filter layer. The color filter layer includes a plurality of filter units spaced apart. The optical adhesive layer includes a first portion located between two adjacent filter units and a second portion located on the light-emitting side of the color filter layer. An anti-reflective structure is provided on the light-emitting side of the color filter layer, and the light transmittance of the anti-reflective structure is greater than a preset value. This invention also relates to a method for manufacturing a display panel and a display device.

Description

Technical Field

[0001] This invention relates to the field of display product manufacturing technology, and in particular to a display panel, its manufacturing method, and a display device. Background Technology

[0002] In recent years, the application of AMOLED (Active Matrix Organic Light Emitting Diode) display technology has been expanding. In the mobile communication terminal equipment sector, competition among mobile phone manufacturers is fierce, and to boost sales, high-end models generally adopt AMOLED displays. Structurally, a top-emitting OLED device can be viewed as a light source sandwiched within an optical interference cavity formed by a highly reflective mirror and a semi-transparent mirror. In an AMOLED display, each RGB sub-pixel can be considered such a device. Although at a normal viewing angle, the white image is controlled by Gamma modulation, adjusting the RGB brightness ratio via electrical signals to achieve white balance, as the viewing angle increases, the different structures of the optical interference cavities of each RGB sub-pixel cause the brightness ratio of the RGB sub-pixels to change with the viewing angle. This further causes the color coordinates of the white image at large viewing angles to deviate from those at a normal viewing angle, resulting in color shift at large viewing angles. This color shift phenomenon is limited by the structure of the OLED device itself and is currently unavoidable in the industry. Furthermore, due to the application of Color Filter and Black Materials in AMOLED, Black Materials significantly accelerate the brightness decay trend of RGB subpixels at wide viewing angles. Moreover, the brightness decay trend of RGB subpixels at wide viewing angles is inconsistent with that of Black Materials, resulting in a mismatch in the RGB brightness decay trend of white screen at wide viewing angles, which aggravates the color shift phenomenon of white screen. This is also an optical problem that urgently needs to be solved in the AMOLED+Color Filter+Black Materials stacked structure. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a display panel and its manufacturing method, as well as a display device, which solves the problems of significant brightness attenuation at wide viewing angles and severe color shift of white images at wide viewing angles caused by the structural arrangement of the color filter layer and black matrix set in the same layer.

[0004] To achieve the above objectives, the technical solution adopted in this embodiment of the invention is as follows: a display panel includes an array substrate and a color filter substrate disposed opposite to each other. The color filter substrate includes a color filter layer and an optical adhesive layer covering the light-emitting side of the color filter layer. The color filter layer includes a plurality of filter units disposed at intervals. The optical adhesive layer includes a first portion located between two adjacent filter units and a second portion located on the light-emitting side of the color filter layer. The light-emitting side of the color filter layer is provided with an anti-reflection functional structure, and the light transmittance of the anti-reflection functional structure is greater than a preset value.

[0005] Optionally, the first part and the second part overlap at least partially.

[0006] Optionally, along the light emission direction of the color filter layer, the orthographic projection of the plurality of filter units is located on the anti-reflection functional structure.

[0007] Optionally, the space between two adjacent filter units may be filled solely by the optical adhesive layer.

[0008] Optionally, the anti-reflective functional structure includes a polarizer and an anti-reflective coating disposed on the side of the polarizer away from and / or close to the color filter layer.

[0009] Optionally, the anti-reflective functional structure includes a cover plate and an anti-reflective coating disposed on the side of the cover plate near the color filter layer.

[0010] Optionally, the anti-reflective functional structure includes a polarizer and an anti-reflective coating disposed on the side of the polarizer away from and / or close to the color filter layer;

[0011] The anti-reflective functional structure further includes a cover plate and an anti-reflective coating disposed on the side of the cover plate near the color filter layer, wherein the cover plate is disposed on the side of the polarizer away from the color filter layer.

[0012] Optionally, the preset value is 50%.

[0013] Optionally, the transmittance of the anti-reflective coating is 50-75%.

[0014] Optionally, the array substrate includes a substrate and a thin-film transistor array layer, an organic light-emitting layer, and an encapsulation layer sequentially disposed along a direction away from the substrate.

[0015] Optionally, an optical adhesive layer is provided on the side of the encapsulation layer away from the substrate to bond the array substrate and the color filter substrate together.

[0016] This invention provides a display device including the display panel described above.

[0017] This invention provides a method for manufacturing a display panel, which includes preparing an array substrate and a color filter substrate, and assembling the array substrate and the color filter substrate together. The preparation of the color filter substrate includes:

[0018] Provide a substrate;

[0019] A color filter layer is formed on the substrate using a patterning process, the color filter layer comprising a plurality of filters spaced apart.

[0020] An optical adhesive layer is formed, the optical adhesive layer comprising a first portion filled between two adjacent filters and a second portion covering the side of the color filter layer away from the substrate;

[0021] The anti-reflective functional structure is formed.

[0022] Optionally, the anti-reflective functional structure includes:

[0023] An anti-reflective coating is applied to at least one side of the polarizer;

[0024] A polarizer coated with an anti-reflective coating is attached to the light-emitting side of the color filter using an optical adhesive layer.

[0025] Fitting cover plate;

[0026] Or include:

[0027] A polarizer is bonded to the light-emitting side of the color filter using an optical adhesive layer.

[0028] An anti-reflective coating is applied to the first surface of the cover plate, the first surface being the surface for bonding with the polarizer;

[0029] The cover plate coated with an anti-reflective coating is attached to the polarizer.

[0030] The beneficial effects of this invention are: by setting the anti-reflection functional structure, the black matrix set in the same layer as the color filter layer is omitted. The anti-reflection functional structure can replace the black matrix to reduce the ambient light reflectivity. By removing the black matrix, the problems of the black matrix setting accelerating brightness attenuation at large viewing angles and aggravating the color shift phenomenon of white images at large viewing angles are solved. Attached Figure Description

[0031] Figure 1 This diagram illustrates the structure of a display panel in the relevant technology. Figure 1 ;

[0032] Figure 2 This diagram illustrates the structure of a display panel in the relevant technology. Figure 2 ;

[0033] Figure 3 This is a schematic diagram of the display panel structure in an embodiment of the present invention;

[0034] Figure 4 express Figure 1 , Figure 2 and Figure 3 Color gamut diagrams of three types of display panels;

[0035] Figure 5 express Figure 1 , Figure 2 and Figure 3 A schematic diagram illustrating the brightness decay trend of three types of display panels;

[0036] Figure 6 express Figure 1 , Figure 2 and Figure 3 A diagram illustrating the color shift of three different display panels;

[0037] Figure 7 express Figure 1 , Figure 2 and Figure 3 A schematic diagram of the color coordinate trajectory of the three display panels. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] To address the issue of Black Materials exacerbating the brightness decay trend and exhibiting differentiating effects on RGB monochrome pixels at wide viewing angles in AMOLED+Color Filter+Black Materials stacked structures, we propose a novel stacked structure employing AMOLED+Color Filter+high transmittance anti-reflective functionality. In AMOLED displays, there are two traditional stacked structures: one based on... Figure 1 As shown, this is an AMOLED+POL stacked structure. In this stacked structure, due to the relatively wide full width at half maximum (FWHM) of the OLED luminescent material's spectrum, the color gamut of the display system is relatively small, and the color gamut is often limited by the type of luminescent material. To solve the AMOLED color gamut problem, such as... Figure 2 The AMOLED + Color Filter + Black Materials stacked structure, as shown, has emerged. However, in this system, a Black Materials functional layer is introduced to reduce the reflection of ambient light by the AMOLED display. Experimental tests revealed that while the Black Materials functional layer can reduce ambient light reflectivity, it significantly impacts the brightness decay trend of RGB sub-pixels at wide viewing angles. On one hand, it severely accelerates the brightness decay trend of WRGB images at wide viewing angles; on the other hand, the different effects of Black Materials on the brightness decay trend of RGB sub-pixels at wide viewing angles lead to aggravated color deviation of white images at wide viewing angles, severely restricting the mass production of this stacked structure. To solve these problems, we propose a novel stacked structure: AMOLED + Color Filter + high-transmittance anti-reflective functional structure. This novel stacked structure not only effectively reduces the reflection of ambient light by the AMOLED display, but also significantly slows down the brightness decay trend of RGB monochrome pixels at wide viewing angles by eliminating the influence of the black matrix. Simultaneously, it effectively reduces the color deviation effect of white images at wide viewing angles, alleviating the brightness decay trend of white images at wide viewing angles. These advantages of the novel stacked structure are likely to become a mainstream mass production technology in the future industrialization of AMOLED.

[0041] For details, please refer to Figure 3This embodiment provides a display panel, including an array substrate 1 and a color filter substrate 2 disposed opposite to each other. The color filter substrate 2 includes a color filter layer and an optical adhesive layer 31 covering the light-emitting side of the color filter layer. The color filter layer includes a plurality of filter units 30 disposed at intervals. The optical adhesive layer 31 includes a first portion located between two adjacent filter units 30 and a second portion located on the light-emitting side of the color filter layer. The light-emitting side of the color filter layer is provided with an anti-reflection functional structure, and the light transmittance of the anti-reflection functional structure is greater than a preset value.

[0042] Figure 1 The middle color filter substrate 2 only shows a schematic diagram of the polarizer structure, compared to Figure 1 The display panel in the middle, Figure 2 The color filter substrate 2 in the middle has an additional color filter layer (i.e., color filter layer) and a black matrix disposed on the same layer, relative to Figure 2 The structure in Figure 3 The color filter substrate 2 in the middle omits the black matrix and adds an anti-reflection function structure on the light-emitting side of the color filter layer.

[0043] The addition of a color filter layer effectively narrows the emission spectrum of AMOLED displays, improving their color gamut characteristics. (Reference) Figure 4 , Figure 1 The display panel in the video has a DCI-P3 color gamut of 107%. Figure 2 The display panel in the video has a DCI-P3 color gamut of 121%. Figure 3 The display panel in this embodiment has a DCI-P3 color gamut of 119%, which shows that the display panel and... Figure 2 The display panel with the structure in the middle also has excellent color gamut performance.

[0044] Figure 5 Comparison Figure 1 , Figure 2 and Figure 3 The brightness decay trend of the white screen at a wide viewing angle in the stacked structure of the three types of display panels (L-Decay) is shown in the first line, 40. Figure 1 The brightness decay trend of the display panel in the image, the second line 50 indicates... Figure 2 The brightness decay trend of the display panel in the image, the third line 60 indicates... Figure 3 The brightness decay trend of the display panel in the middle, from Figure 5 It can be obtained from [the source]. Figure 2 In the display panel shown, the use of the black matrix severely accelerates the brightness decay trend of the white screen at wide viewing angles, while the display panel in this embodiment significantly alleviates this brightness decay.

[0045] Figure 6 Compare with Table 1 at the same time Figure 1 , Figure 2 and Figure 3 The color deviation phenomenon of white screen at large viewing angle in the stacked structure of three types of display panels. Figure 6 In the middle, the fourth line 70 represents Figure 1 The color shift of the display panel is indicated by the fifth line, 80. Figure 2 The color shift of the display panel is indicated by the sixth line at 90 degrees. Figure 3 The degree of color shift in the display panel, from Figure 6 It can be seen that, compared with the display panels in the two conventional structures, the display panel provided in this embodiment significantly reduces the color shift of the white screen at wide viewing angles. The color shift levels of the display panel provided in this embodiment at viewing angles of 30 / 45 / 60° are 1.4 / 1.7 / 1.9 JNCD, which are significantly better than those of conventional display panels, as shown in the table below:

[0046]

[0047] refer to Figure 5 , Figure 6 Based on the table above, it can be seen that the display panel provided in this embodiment omits the black matrix and adds an anti-reflective structure. The anti-reflective structure has a high light transmittance, which plays the role of reducing ambient light reflection, just like the black matrix layer, ensuring the display effect. It also slows down the brightness decay trend at large viewing angles and reduces the color shift of the white screen at large viewing angles.

[0048] exist Figure 7 In the middle, a comparison was made Figure 1 , Figure 2 and Figure 3 In the stacked structure of the three display panels, the color coordinate trajectory of the white screen at a wide viewing angle is shown. The three dotted rings represent different color shift values, from the inside out: 3.0 JNCD, 4.5 JNCD, and 6.0 JNCD. Figure 7 The first trajectory line in the middle is 100. Figure 1 The color coordinate trajectory of the display panel in the image, the second trajectory line 200 represents... Figure 2 The color coordinate trajectory of the display panel in the image, the third trajectory line 300 represents... Figure 3 The color coordinate trajectory of the display panel in the middle, from Figure 7 It can be seen from this that in the relevant technologies Figure 1 The white image on the display panel shifts towards the cyan area at wide viewing angles. Figure 2The white screen of the display panel in the previous embodiment deviated towards the yellow area at a wide viewing angle, and all of them exceeded the 6.0 JNCD spec line, resulting in poor visual display effect. However, the white screen of the display panel in this embodiment has a small degree of color coordinate deviation at a wide viewing angle. Within the viewing angle range of 0° to 80°, the color coordinate trajectory is within the 6.0 JNCD spec line, resulting in good visual display effect.

[0049] In this embodiment, the anti-reflection structure reduces ambient light reflectivity. Therefore, compared with the traditional structure, the black matrix can be omitted, thus solving the problem of large brightness attenuation and severe white screen color distortion at wide viewing angles caused by the presence of the black matrix.

[0050] In this embodiment, the first portion and the second portion overlap at least partially. When fabricating the optical adhesive layer, the first portion located between two adjacent filter units needs to be fabricated first, and then the second portion located on the light-emitting side of the color green light layer needs to be fabricated. To ensure that the surface of the optical adhesive layer away from the color green light layer is planar, the first portion and the second portion overlap at least partially. In a specific embodiment of this embodiment, the second portion completely covers the side of the first portion away from the color filter layer.

[0051] In this embodiment, as an example, along the light emission direction of the color filter layer, the orthogonal projection of the plurality of filter units is located on the anti-reflection functional structure, effectively avoiding the influence of ambient light on the display effect.

[0052] In this embodiment, as an example, the space between two adjacent filter units is filled only by the optical adhesive layer. By eliminating the need for a black matrix, the problem of significant brightness attenuation and severe color distortion of white images at wide viewing angles, caused by the presence of a black matrix, can be solved.

[0053] The anti-reflective functional structure can have various specific structural forms. In this embodiment, the anti-reflective functional structure includes a polarizer 10 and an anti-reflective coating disposed on the side of the polarizer 10 away from and / or close to the color filter layer.

[0054] In this embodiment, the anti-reflective functional structure includes a cover plate 20 and an anti-reflective coating disposed on the side of the cover plate 20 near the color filter layer.

[0055] In one specific embodiment of this example, the anti-reflection functional structure includes a polarizer and an anti-reflection coating disposed on the side of the polarizer away from and / or close to the color filter layer;

[0056] The anti-reflective functional structure further includes a cover plate and an anti-reflective coating disposed on the side of the cover plate near the color filter layer, wherein the cover plate is disposed on the side of the polarizer away from the color filter layer.

[0057] It should be noted that the anti-reflective functional structure is not limited to the above description. In one embodiment of this example, the color filter substrate 2 may also include a touch function layer, and the anti-reflective coating may also be integrated on the touch function layer to reduce ambient light reflection.

[0058] It should be noted that, Figures 1-3 In this context, the Functional Layer can be configured with different functional structures according to actual needs, such as an optical adhesive layer or a touch function layer.

[0059] While reducing ambient light reflection, the anti-reflective structure must also ensure light transmittance to avoid affecting the display effect. In this embodiment, the preset value is 50%.

[0060] In one embodiment of this example, the transmittance of the anti-reflective coating is 50-75%.

[0061] In this embodiment, the display panel is an AMOLED display panel. Exemplarily in this embodiment, the array substrate 1 includes a substrate and a thin film transistor array layer, an organic light-emitting layer and an encapsulation layer sequentially disposed along a direction away from the substrate.

[0062] The organic light-emitting layer is provided with a first electrode, a hole transport layer, a light-emitting layer, an electron transport layer, and a second electrode in sequence along the direction away from the substrate.

[0063] In this embodiment, an optical adhesive layer is provided on the side of the encapsulation layer away from the substrate to bond the array substrate 1 and the color filter substrate 2.

[0064] This invention provides a display device including the display panel described above.

[0065] This invention provides a method for manufacturing a display panel, which includes preparing an array substrate 1 and a color filter substrate 2, and aligning the array substrate 1 and the color filter substrate 2. The preparation of the color filter substrate 2 includes:

[0066] Provide a substrate;

[0067] A color filter layer is formed on the substrate using a patterning process, the color filter layer comprising a plurality of filters spaced apart.

[0068] An optical adhesive layer is formed, the optical adhesive layer comprising a first portion filled between two adjacent filters and a second portion covering the side of the color filter layer away from the substrate;

[0069] The anti-reflective functional structure is formed.

[0070] In this embodiment, the anti-reflection functional structure is formed by way of example, specifically including:

[0071] An anti-reflective coating is applied to at least one side of the polarizer;

[0072] A polarizer coated with an anti-reflective coating is attached to the light-emitting side of the color filter using an optical adhesive layer.

[0073] Fitting cover plate;

[0074] Or include:

[0075] A polarizer is bonded to the light-emitting side of the color filter using an optical adhesive layer.

[0076] An anti-reflective coating is applied to the first surface of the cover plate, the first surface being the surface for bonding with the polarizer;

[0077] The cover plate coated with an anti-reflective coating is attached to the polarizer.

[0078] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A display panel, comprising an array substrate and a color filter substrate disposed opposite to each other, characterized in that, The color filter substrate comprises a color filter layer, an optical adhesive layer covering the light-emitting side of the color filter layer, and an anti-reflective functional structure. The color filter layer includes a plurality of filter units spaced apart. The optical adhesive layer includes a first portion located between two adjacent filter units and a second portion located on the light-emitting side of the color filter layer. The anti-reflective functional structure is provided on the light-emitting side of the color filter layer, and the light transmittance of the anti-reflective functional structure is greater than a preset value. The first part and the second part overlap at least partially, and the surface of the optical adhesive layer on the side away from the color filter layer is planar; The preset value is 50%; The space between two adjacent filter units is filled only by the optical adhesive layer; The width of the filter unit on the side away from the array substrate is greater than the width on the side closer to the array substrate, and the surface of the filter unit in contact with the optical adhesive layer is curved.

2. The display panel according to claim 1, characterized in that, Along the light emission direction of the color filter layer, the orthogonal projection of the plurality of filter units is located on the anti-reflection functional structure.

3. The display panel according to claim 1, characterized in that, The anti-reflective functional structure includes a polarizer and an anti-reflective coating disposed on the side of the polarizer away from and / or close to the color filter layer.

4. The display panel according to claim 1, characterized in that, The anti-reflective functional structure includes a cover plate and an anti-reflective coating disposed on the side of the cover plate near the color filter layer.

5. The display panel according to claim 1, characterized in that, The anti-reflective functional structure includes a polarizer and an anti-reflective coating disposed on the side of the polarizer away from and / or close to the color filter layer; The anti-reflective functional structure further includes a cover plate and an anti-reflective coating disposed on the side of the cover plate near the color filter layer, wherein the cover plate is disposed on the side of the polarizer away from the color filter layer.

6. The display panel according to claim 5, characterized in that, The light transmittance of the anti-reflective coating is 50-75%.

7. The display panel according to claim 1, characterized in that, The array substrate includes a substrate and a thin-film transistor array layer, an organic light-emitting layer, and an encapsulation layer arranged sequentially along a direction away from the substrate.

8. The display panel according to claim 7, characterized in that, An optical adhesive layer is provided on the side of the encapsulation layer away from the substrate to bond the array substrate and the color filter substrate together.

9. A display device, characterized in that, Includes the display panel as described in any one of claims 1-8.

10. A method for manufacturing a display panel, used to manufacture the display panel according to any one of claims 1-8, comprising preparing an array substrate and a color filter substrate, and aligning the array substrate and the color filter substrate, characterized in that, The preparation of the color filter substrate includes: Provide a substrate; A color filter layer is formed on the substrate using a patterning process, and the color filter layer includes a plurality of filter units spaced apart. An optical adhesive layer is formed, the optical adhesive layer including a first portion filled between two adjacent filter units and a second portion covering the side of the color filter layer away from the substrate. When the optical adhesive layer is made, the first portion located between two adjacent filter units is made first, and then the second portion located on the light-emitting side of the color filter layer is made. The first portion and the second portion at least partially overlap. The anti-reflective functional structure is formed.

11. The method for manufacturing a display panel according to claim 10, characterized in that, The anti-reflective functional structure specifically includes: An anti-reflective coating is applied to at least one side of the polarizer; A polarizer coated with an anti-reflective coating is attached to the light-emitting side of the color filter layer using an optical adhesive layer; Fitting cover plate; Or include: A polarizer is bonded to the light-emitting side of the color filter layer using an optical adhesive layer; An anti-reflective coating is applied to the first surface of the cover plate, the first surface being the surface for bonding with the polarizer; The cover plate coated with an anti-reflective coating is attached to the polarizer.

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